/*!*****************************************************************************************************************************************************************************************************************************************************************!*\
  !*** css ./node_modules/next/dist/build/webpack/loaders/css-loader/src/index.js??ruleSet[1].rules[14].oneOf[10].use[2]!./node_modules/next/dist/build/webpack/loaders/postcss-loader/src/index.js??ruleSet[1].rules[14].oneOf[10].use[3]!./src/app/globals.css ***!
  \*****************************************************************************************************************************************************************************************************************************************************************/
/*! tailwindcss v4.3.3 | MIT License | https://tailwindcss.com */
@import url('https://fonts.googleapis.com/css2?family=Architects+Daughter&display=swap');
@layer properties;
.pointer-events-none {
  pointer-events: none;
}
.collapse {
  visibility: collapse;
}
.invisible {
  visibility: hidden;
}
.visible {
  visibility: visible;
}
.absolute {
  position: absolute;
}
.fixed {
  position: fixed;
}
.relative {
  position: relative;
}
.static {
  position: static;
}
.sticky {
  position: sticky;
}
.container {
  width: 100%;
}
.ml-auto {
  margin-left: auto;
}
.block {
  display: block;
}
.contents {
  display: contents;
}
.flex {
  display: flex;
}
.grid {
  display: grid;
}
.hidden {
  display: none;
}
.inline {
  display: inline;
}
.inline-block {
  display: inline-block;
}
.inline-flex {
  display: inline-flex;
}
.table {
  display: table;
}
.h-\[44px\] {
  height: 44px;
}
.h-screen {
  height: 100vh;
}
.w-\[1px\] {
  width: 1px;
}
.w-\[44px\] {
  width: 44px;
}
.w-full {
  width: 100%;
}
.w-screen {
  width: 100vw;
}
.max-w-\[85\%\] {
  max-width: 85%;
}
.flex-1 {
  flex: 1;
}
.flex-shrink {
  flex-shrink: 1;
}
.grow {
  flex-grow: 1;
}
.rotate-180 {
  rotate: 180deg;
}
.transform {
  transform: var(--tw-rotate-x,) var(--tw-rotate-y,) var(--tw-rotate-z,) var(--tw-skew-x,) var(--tw-skew-y,);
}
.resize {
  resize: both;
}
.flex-col {
  flex-direction: column;
}
.flex-wrap {
  flex-wrap: wrap;
}
.items-center {
  align-items: center;
}
.justify-between {
  justify-content: space-between;
}
.justify-center {
  justify-content: center;
}
.self-start {
  align-self: flex-start;
}
.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.overflow-hidden {
  overflow: hidden;
}
.overflow-y-auto {
  overflow-y: auto;
}
.rounded-full {
  border-radius: calc(infinity * 1px);
}
.border {
  border-style: var(--tw-border-style);
  border-width: 1px;
}
.border-4 {
  border-style: var(--tw-border-style);
  border-width: 4px;
}
.border-b {
  border-bottom-style: var(--tw-border-style);
  border-bottom-width: 1px;
}
.border-solid {
  --tw-border-style: solid;
  border-style: solid;
}
.border-\[rgba\(255\,196\,0\,0\.15\)\] {
  border-color: rgba(255,196,0,0.15);
}
.border-\[var\(--accent\)\] {
  border-color: var(--accent);
}
.border-\[var\(--border-color\)\] {
  border-color: var(--border-color);
}
.border-t-transparent {
  border-top-color: transparent;
}
.bg-\[rgba\(255\,196\,0\,0\.06\)\] {
  background-color: rgba(255,196,0,0.06);
}
.bg-\[var\(--accent\)\] {
  background-color: var(--accent);
}
.bg-\[var\(--input-bg\)\] {
  background-color: var(--input-bg);
}
.bg-\[var\(--main-bg\)\] {
  background-color: var(--main-bg);
}
.bg-\[radial-gradient\(circle_at_50\%_0\%\,_rgba\(255\,204\,0\,0\.05\)_0\%\,_transparent_50\%\)\] {
  background-image: radial-gradient(circle at 50% 0%, rgba(255,204,0,0.05) 0%, transparent 50%);
}
.text-center {
  text-align: center;
}
.text-left {
  text-align: left;
}
.text-\[11px\] {
  font-size: 11px;
}
.text-\[12\.5px\] {
  font-size: 12.5px;
}
.text-\[12px\] {
  font-size: 12px;
}
.text-\[16px\] {
  font-size: 16px;
}
.break-all {
  word-break: break-all;
}
.text-\[var\(--text-primary\)\] {
  color: var(--text-primary);
}
.text-\[var\(--text-secondary\)\] {
  color: var(--text-secondary);
}
.text-\[var\(--text-tertiary\)\] {
  color: var(--text-tertiary);
}
.capitalize {
  text-transform: capitalize;
}
.uppercase {
  text-transform: uppercase;
}
.italic {
  font-style: italic;
}
.line-through {
  text-decoration-line: line-through;
}
.overline {
  text-decoration-line: overline;
}
.underline {
  text-decoration-line: underline;
}
.antialiased {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
.opacity-40 {
  opacity: 40%;
}
.opacity-60 {
  opacity: 60%;
}
.ring {
  --tw-ring-shadow: var(--tw-ring-inset,) 0 0 0 calc(1px + var(--tw-ring-offset-width)) var(--tw-ring-color, currentcolor);
  box-shadow: var(--tw-inset-shadow), var(--tw-inset-ring-shadow), var(--tw-ring-offset-shadow), var(--tw-ring-shadow), var(--tw-shadow);
}
.outline {
  outline-style: var(--tw-outline-style);
  outline-width: 1px;
}
.filter {
  filter: var(--tw-blur,) var(--tw-brightness,) var(--tw-contrast,) var(--tw-grayscale,) var(--tw-hue-rotate,) var(--tw-invert,) var(--tw-saturate,) var(--tw-sepia,) var(--tw-drop-shadow,);
}
.backdrop-filter {
  -webkit-backdrop-filter: var(--tw-backdrop-blur,) var(--tw-backdrop-brightness,) var(--tw-backdrop-contrast,) var(--tw-backdrop-grayscale,) var(--tw-backdrop-hue-rotate,) var(--tw-backdrop-invert,) var(--tw-backdrop-opacity,) var(--tw-backdrop-saturate,) var(--tw-backdrop-sepia,);
  backdrop-filter: var(--tw-backdrop-blur,) var(--tw-backdrop-brightness,) var(--tw-backdrop-contrast,) var(--tw-backdrop-grayscale,) var(--tw-backdrop-hue-rotate,) var(--tw-backdrop-invert,) var(--tw-backdrop-opacity,) var(--tw-backdrop-saturate,) var(--tw-backdrop-sepia,);
}
.transition {
  transition-property: color, background-color, border-color, outline-color, text-decoration-color, fill, stroke, --tw-gradient-from, --tw-gradient-via, --tw-gradient-to, opacity, box-shadow, transform, translate, scale, rotate, filter, -webkit-backdrop-filter, backdrop-filter, display, content-visibility, overlay, pointer-events;
  transition-timing-function: var(--tw-ease, ease);
  transition-duration: var(--tw-duration, 0s);
}
.transition-colors {
  transition-property: color, background-color, border-color, outline-color, text-decoration-color, fill, stroke, --tw-gradient-from, --tw-gradient-via, --tw-gradient-to;
  transition-timing-function: var(--tw-ease, ease);
  transition-duration: var(--tw-duration, 0s);
}
.transition-opacity {
  transition-property: opacity;
  transition-timing-function: var(--tw-ease, ease);
  transition-duration: var(--tw-duration, 0s);
}
.transition-transform {
  transition-property: transform, translate, scale, rotate;
  transition-timing-function: var(--tw-ease, ease);
  transition-duration: var(--tw-duration, 0s);
}
.select-none {
  -webkit-user-select: none;
  user-select: none;
}
@media (hover: hover) {
  .hover\:text-\[var\(--text-primary\)\]:hover {
    color: var(--text-primary);
  }
  .hover\:opacity-90:hover {
    opacity: 90%;
  }
}
.active\:opacity-100:active {
  opacity: 100%;
}
:root {
  --radius: 32px;
  --color-biology: #4ADE80;
  --color-chemistry: #F87171;
  --color-mathematics: #60A5FA;
  --color-physics: #A78BFA;
  --color-accounting: #FFC400;
  --color-esl: #34D399;
  --color-default: #FFC400;
  --level-1-color: #FFC400;
  --level-1-rgb: 255, 196, 0;
  --level-2-color: #3B82F6;
  --level-2-rgb: 59, 130, 246;
  --level-3-color: #A78BFA;
  --level-3-rgb: 167, 139, 250;
  --level-4-color: #4ADE80;
  --level-4-rgb: 74, 222, 128;
  --level-5-color: #F87171;
  --level-5-rgb: 248, 113, 113;
  --accent-rgb: 255, 196, 0;
  --overlay-bg: rgba(0, 0, 0, 0.65);
  --modal-shadow: rgba(0, 0, 0, 0.55);
  --drop-shadow: rgba(0, 0, 0, 0.45);
}
[data-theme='light'] {
  --sidebar-bg: #f3f4f6;
  --main-bg: #f3f4f6;
  --bg-primary: #ffffff;
  --modal-card-bg: #ffffff;
  --ink: 13, 13, 13;
  --text-primary: #0d0d0d;
  --text-secondary: #333333;
  --text-faded: #555555;
  --text-tertiary: #999999;
  --border-color: #d9d9d9;
  --nav-active-bg: #f2f2f2;
  --bg-active: #ffffff;
  --bg-tertiary: #f9f9f9;
  --section-highlight: #ffffff;
  --select-highlight: #eaeaea;
  --input-main-bg: #ffffff;
  --input-bg: #fafafa;
  --input-border: #cccccc;
  --tool-bg: #f5f5f5;
  --dropdown-bg: #ffffff;
  --accent: #ffc400;
  --accent-hover: #6c90ff;
  --surface-card: #ffffff;
  --amber-text: #8a6d0b;
  --user-bubble-bg: #f97316;
  --user-bubble-color: #ffffff;
  --ai-bubble-bg: #ffffff;
  --ai-bubble-border: rgba(0, 0, 0, 0.06);
}
[data-theme='dark'] {
  --sidebar-bg: #121212;
  --main-bg: #121212;
  --bg-primary: #121212;
  --modal-card-bg: #1c1c1e;
  --ink: 245, 245, 245;
  --text-primary: #f5f5f5;
  --text-secondary: #b5b5b5;
  --text-faded: #7a7a7a;
  --text-tertiary: #8a8a8a;
  --section-highlight: rgba(255, 255, 255, 0.03);
  --select-highlight: #252525;
  --border-color: #1e1e1e;
  --nav-active-bg: #3a3a3a;
  --bg-active: #4a4a4a;
  --bg-tertiary: #2d2d2d;
  --input-main-bg: #303030;
  --input-bg: #2a2a2a;
  --input-border: #3c3c3c;
  --tool-bg: #1f1f1f;
  --dropdown-bg: #1f1f1f;
  --accent: #ffc400;
  --accent-hover: #7da3ff;
  --surface-card: #1e1e1e;
  --amber-text: #f0c93d;
  --user-bubble-bg: #f97316;
  --user-bubble-color: #ffffff;
  --ai-bubble-bg: rgba(255, 255, 255, 0.04);
  --ai-bubble-border: rgba(255, 255, 255, 0.07);
}
[data-theme='dark'][data-dark-variant='charcoal'] {
  --sidebar-bg: #212121;
  --main-bg: #212121;
  --bg-primary: #212121;
  --text-primary: #e5e5e5;
  --text-secondary: #b0b0b0;
  --text-faded: #808080;
  --text-tertiary: #909090;
  --section-highlight: rgba(255, 255, 255, 0.03);
  --select-highlight: #2a2a2a;
  --border-color: #2d2d2d;
  --nav-active-bg: #2d2d2d;
  --bg-active: #3d3d3d;
  --bg-tertiary: #353535;
  --input-main-bg: #303030;
  --input-bg: #2d2d2d;
  --input-border: #3a3a3a;
  --tool-bg: #252525;
  --dropdown-bg: #1f1f1f;
  --accent: #ffc400;
  --surface-card: #252525;
  --user-bubble-bg: #f97316;
  --user-bubble-color: #ffffff;
  --ai-bubble-bg: rgba(255, 255, 255, 0.04);
  --ai-bubble-border: rgba(255, 255, 255, 0.07);
}
[data-theme='dark'] select {
  color-scheme: dark;
}
[data-theme='dark'] select option {
  background-color: #1f1f1f;
  color: var(--text-primary);
}
[data-font-size='small'] {
  font-size: 12px;
  --font-size-base: 12px;
  --font-size-message: 14px;
  --font-size-title: 11px;
  --font-size-conversation: 13px;
  --font-size-sidebar: 14px;
  --font-size-small: 10px;
  --font-size-large: 15px;
  --font-size-xlarge: 17px;
  --font-size-huge: 24px;
  --font-size-display: 48px;
}
[data-font-size='medium'] {
  font-size: 14px;
  --font-size-base: 14px;
  --font-size-message: 15px;
  --font-size-title: 13px;
  --font-size-conversation: 14px;
  --font-size-sidebar: 15px;
  --font-size-small: 11px;
  --font-size-large: 16px;
  --font-size-xlarge: 19px;
  --font-size-huge: 32px;
  --font-size-display: 56px;
}
[data-font-size='large'] {
  font-size: 16px;
  --font-size-base: 16px;
  --font-size-message: 18px;
  --font-size-title: 15px;
  --font-size-conversation: 17px;
  --font-size-sidebar: 18px;
  --font-size-small: 13px;
  --font-size-large: 19px;
  --font-size-xlarge: 21px;
  --font-size-huge: 36px;
  --font-size-display: 64px;
}
[data-font-size='xlarge'] {
  font-size: 18px;
  --font-size-base: 18px;
  --font-size-message: 20px;
  --font-size-title: 17px;
  --font-size-conversation: 19px;
  --font-size-sidebar: 20px;
  --font-size-small: 15px;
  --font-size-large: 21px;
  --font-size-xlarge: 23px;
  --font-size-huge: 40px;
  --font-size-display: 72px;
}
body {
  color: var(--text-primary);
  background: var(--main-bg);
  font-size: var(--font-size-base);
  font-family: 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overscroll-behavior-y: none;
}
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--nav-active-bg);
}
@layer base {
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
  }
}
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.animate-fadeInUp {
  animation: fadeInUp 0.8s ease-out;
}
.sidebar {
  width: 280px;
  padding: 24px 16px;
  font-family: 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  background-color: var(--sidebar-bg);
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1),
    padding 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: visible !important;
  position: relative;
  z-index: 1100;
  flex-shrink: 0;
}
.main-content {
  flex: 1;
  background-color: var(--main-bg);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}
.sidebar.collapsed {
  width: 78px !important;
  padding: 24px 10px !important;
}
.sidebar.collapsed .sidebar-header-top {
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.sidebar.collapsed .sidebar-logo {
  justify-content: center;
  margin: 0 auto;
}
.sidebar.collapsed .sidebar-search-trigger span,
.sidebar.collapsed .sidebar-search-trigger .shortcut,
.sidebar.collapsed .nav-item span,
.sidebar.collapsed .section-header span,
.sidebar.collapsed .history-header span,
.sidebar.collapsed .user-name,
.sidebar.collapsed .upgrade-btn,
.sidebar.collapsed .toggle-icon {
  display: none !important;
}
.sidebar.collapsed .sidebar-search-trigger {
  background: transparent !important;
  border: none !important;
  border-radius: 12px !important;
  width: 44px !important;
  height: 44px !important;
  margin: 4px auto !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  padding: 0 !important;
}
.sidebar.collapsed .nav-item {
  justify-content: center !important;
  padding: 10px !important;
  transition: all 0.25s ease;
  border-radius: 12px !important;
  width: 44px !important;
  height: 44px !important;
  margin: 2px auto !important;
  display: flex !important;
  flex-direction: row !important;
  align-items: center !important;
  gap: 0 !important;
}
.sidebar.collapsed .history-item {
  justify-content: center !important;
  padding: 10px !important;
  width: 44px !important;
  height: 44px !important;
  border-radius: 12px !important;
  margin: 2px auto !important;
}
.sidebar.collapsed .sidebar-search-trigger:hover,
.sidebar.collapsed .nav-item:hover,
.sidebar.collapsed .history-item:hover {
  background-color: var(--nav-active-bg) !important;
  border-radius: 12px !important;
}
.sidebar.collapsed .user-menu-container {
  justify-content: center;
  padding: 10px 0;
}
html.sidebar-collapsed .sidebar {
  width: 78px !important;
  padding: 24px 10px !important;
}
html.sidebar-collapsed .sidebar .sidebar-header-top {
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
html.sidebar-collapsed .sidebar .sidebar-logo {
  justify-content: center;
  margin: 0 auto;
}
html.sidebar-collapsed .sidebar .sidebar-search-trigger span,
html.sidebar-collapsed .sidebar .sidebar-search-trigger .shortcut,
html.sidebar-collapsed .sidebar .nav-item span,
html.sidebar-collapsed .sidebar .section-header span,
html.sidebar-collapsed .sidebar .history-header span,
html.sidebar-collapsed .sidebar .user-name,
html.sidebar-collapsed .sidebar .upgrade-btn,
html.sidebar-collapsed .sidebar .toggle-icon {
  display: none !important;
}
html.sidebar-collapsed .sidebar .sidebar-search-trigger {
  background: transparent !important;
  border: none !important;
  border-radius: 12px !important;
  width: 44px !important;
  height: 44px !important;
  margin: 4px auto !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  padding: 0 !important;
}
html.sidebar-collapsed .sidebar .nav-item {
  justify-content: center !important;
  padding: 10px !important;
  border-radius: 12px !important;
  width: 44px !important;
  height: 44px !important;
  margin: 2px auto !important;
  display: flex !important;
  flex-direction: row !important;
  align-items: center !important;
  gap: 0 !important;
}
html.sidebar-collapsed .sidebar .history-item {
  justify-content: center !important;
  padding: 10px !important;
  width: 44px !important;
  height: 44px !important;
  border-radius: 12px !important;
  margin: 2px auto !important;
}
html.sidebar-collapsed .sidebar .sidebar-search-trigger:hover,
html.sidebar-collapsed .sidebar .nav-item:hover,
html.sidebar-collapsed .sidebar .history-item:hover {
  background-color: var(--nav-active-bg) !important;
  border-radius: 12px !important;
}
html.sidebar-collapsed .sidebar .user-menu-container {
  justify-content: center;
  padding: 10px 0;
}
html.sidebar-collapsed .sidebar .nav-item,
html.sidebar-collapsed .sidebar .section-header,
html.sidebar-collapsed .sidebar .history-header,
html.sidebar-collapsed .sidebar .user-menu-container {
  justify-content: center;
  padding: 10px 0;
}
html.sidebar-collapsed .sidebar .sidebar-nested-container {
  display: none;
}
.sidebar-header {
  margin-bottom: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  flex-shrink: 0;
}
.sidebar-header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  overflow: hidden;
}
.sidebar-logo img {
  width: 32px;
  height: 32px;
  object-fit: contain;
}
.collapse-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s,
    color 0.2s;
  width: 36px;
  height: 36px;
}
.collapse-btn:hover {
  background: var(--nav-active-bg);
}
.sidebar-search-trigger {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 9px 14px;
  background-color: var(--input-bg);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  color: var(--text-color-secondary, var(--text-secondary));
  font-size: 13px;
  font-family: 'Plus Jakarta Sans', 'Inter', -apple-system, sans-serif;
  cursor: pointer;
  transition: all 0.2s;
  user-select: none;
  margin-bottom: 4px;
}
.sidebar-search-trigger:hover {
  background-color: var(--nav-active-bg);
  border-color: var(--nav-active-bg);
}
.sidebar-search-trigger .shortcut {
  margin-left: auto;
  font-size: var(--font-size-small);
  opacity: 0.6;
}
.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding-right: 4px;
  margin-right: -4px;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: 12px;
  color: var(--text-primary);
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s;
  text-decoration: none;
  font-family: 'Plus Jakarta Sans', 'Inter', -apple-system, sans-serif;
  letter-spacing: -0.1px;
}
.nav-item:hover {
  background-color: var(--bg-active);
}
.nav-item.active {
  background-color: var(--bg-active);
  box-shadow: 0px 8px 16px rgba(0, 0, 0, 0.04), 0px 2px 4px rgba(0, 0, 0, 0.02);
  font-weight: 600;
  color: var(--text-primary);
}
.nav-item.has-submenu {
  flex-direction: column;
  align-items: stretch;
  padding: 0 !important;
  gap: 0;
}
.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  border-radius: 12px;
  color: var(--text-primary);
  font-size: 13.5px;
  font-weight: 550;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  user-select: none;
  position: relative;
  margin-top: 12px;
  font-family: 'Plus Jakarta Sans', 'Inter', -apple-system, sans-serif;
}
.history-header:hover {
  background-color: var(--nav-active-bg);
}
.history-header>div {
  display: flex;
  align-items: center;
  gap: 12px;
}
.nav-item-main,
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 10px 14px !important;
}
.nav-item-main>div,
.section-header>div {
  display: flex;
  align-items: center;
  gap: 12px;
}
.section-header {
  color: var(--text-primary);
  font-size: var(--font-size-base);
  font-weight: 500 !important;
  cursor: pointer;
}
.history-subheader {
  padding: 10px 14px 4px;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.7px;
  opacity: 0.65;
  font-family: 'Plus Jakarta Sans', 'Inter', -apple-system, sans-serif;
}
.sidebar-nested-container {
  margin-left: 20px;
  padding-left: 16px;
  border-left: 1.5px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: 4px;
  margin-bottom: 8px;
  transition: all 0.3s ease;
}
.history-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 12.5px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
  text-decoration: none;
  font-family: 'Plus Jakarta Sans', 'Inter', -apple-system, sans-serif;
}
.history-item-mode-icon {
  width: 14px;
  height: 14px;
  color: var(--text-secondary);
  opacity: 0.8;
  flex-shrink: 0;
}
.history-item:hover {
  background-color: var(--bg-active);
}
.history-item.active {
  background-color: var(--bg-active);
}
.sidebar-footer {
  margin-top: auto;
  padding: 12px 0 20px;
  flex-shrink: 0;
}
.user-menu-container {
  padding: 8px;
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  position: relative;
  border-radius: 8px;
  transition: background 0.2s;
}
.user-menu-container:hover {
  background-color: var(--nav-active-bg);
}
.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  color: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  flex-shrink: 0;
}
.user-name {
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--text-primary);
  flex: 1;
}
.upgrade-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  color: var(--text-primary);
  background: transparent;
  border: 1px solid var(--accent);
  border-radius: 20px;
  font-size: var(--font-size-small);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  flex-shrink: 0;
}
.upgrade-btn:hover {
  background: var(--accent);
  color: #000;
}
.sidebar.collapsed .sidebar-search-trigger,
.sidebar.collapsed .user-name,
.sidebar.collapsed .upgrade-btn,
.sidebar.collapsed .nav-item span,
.sidebar.collapsed .section-header span,
.sidebar.collapsed .history-header span,
.sidebar.collapsed .toggle-icon {
  display: none;
}
.sidebar.collapsed .nav-item,
.sidebar.collapsed .section-header,
.sidebar.collapsed .history-header,
.sidebar.collapsed .user-menu-container {
  justify-content: center;
  padding: 10px 0;
}
.sidebar.collapsed .sidebar-nested-container {
  display: none;
}
.history-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: 8px;
  color: var(--text-primary);
  font-size: var(--font-size-base);
  text-decoration: none;
  transition: background 0.2s;
  font-weight: 500;
}
.history-item:hover {
  background-color: var(--bg-active);
}
.history-item span {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.history-item-mode-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 8px;
  color: var(--text-secondary);
  flex-shrink: 0;
}
.history-item-mode-icon svg {
  width: 17px;
  height: 17px;
}
.history-item-edit {
  opacity: 0;
  transition: opacity 0.2s ease;
  display: flex;
  align-items: center;
  padding: 4px;
  border-radius: 4px;
  margin-left: 8px;
  cursor: pointer;
  flex-shrink: 0;
}
.history-item-edit:hover {
  background-color: var(--nav-active-bg);
}
.history-item:hover .history-item-edit {
  opacity: 1;
}
.history-item-edit svg {
  width: 16px;
  height: 16px;
  color: var(--text-primary);
}
.history-item-dropdown {
  position: fixed;
  background-color: var(--input-bg);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.55);
  padding: 8px;
  min-width: 190px;
  z-index: 10000;
  visibility: hidden;
  opacity: 0;
  top: auto;
  right: auto;
  transform: translateY(12px);
  pointer-events: none;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}
.history-item-dropdown.show {
  visibility: visible !important;
  opacity: 1 !important;
  display: block !important;
  pointer-events: auto !important;
  transform: translateY(0) !important;
}
.dropdown-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  cursor: pointer;
  border-radius: 10px;
  color: var(--text-primary);
  font-size: var(--font-size-base);
  font-weight: 500;
}
.dropdown-item:hover {
  background-color: var(--nav-active-bg);
}
.dropdown-item-danger {
  color: #ff4b4b;
}
.dropdown-item-danger svg {
  color: #ff4b4b;
}
.user-menu-header {
  padding: 12px 14px 6px;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  opacity: 0.7;
}
.user-menu-wrapper {
  position: relative;
  width: 100%;
}
.user-menu {
  position: absolute;
  bottom: calc(100% + 12px);
  left: 0;
  width: 260px;
  background: var(--input-bg);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 12px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
  display: none;
  z-index: 1200;
}
.user-menu.visible {
  display: block !important;
}
.user-menu-profile {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  margin-bottom: 4px;
  cursor: pointer;
  border-radius: 8px;
  transition: background 0.2s;
}
.user-menu-profile:hover {
  background: var(--nav-active-bg);
}
.user-menu-profile-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 16px;
  flex-shrink: 0;
}
.user-menu-profile-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow: hidden;
}
.user-menu-profile-name {
  font-size: var(--font-size-message);
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.user-menu-profile-username {
  font-size: var(--font-size-conversation);
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.user-menu-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border-radius: 10px;
  font-size: var(--font-size-base);
  color: var(--text-primary);
  cursor: pointer;
  transition: background 0.2s;
}
.user-menu-item:hover {
  background: var(--nav-active-bg);
}
.user-menu-item.has-submenu {
  position: relative;
  display: flex;
  justify-content: space-between;
}
.user-menu-item.has-submenu::after {
  content: '';
  position: absolute;
  right: -12px;
  top: 0;
  width: 12px;
  height: 100%;
}
.user-submenu {
  position: absolute;
  left: calc(100% + 8px);
  bottom: 0;
  background: var(--input-bg);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 10px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
  display: none;
  min-width: 180px;
  z-index: 1300;
}
.user-menu-item.has-submenu:hover .user-submenu {
  display: block;
}
.user-submenu-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border-radius: 10px;
  font-size: var(--font-size-base);
  color: var(--text-primary);
  cursor: pointer;
  transition: background 0.2s;
}
.user-submenu-item:hover {
  background: var(--nav-active-bg);
}
.chat-window {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100%;
  overflow: hidden;
  position: relative;
  background: var(--main-bg);
}
.chat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  background: var(--main-bg);
  height: 56px;
  flex-shrink: 0;
  z-index: 10;
}
.chat-header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}
.chat-header-logo {
  width: 35px;
  height: 35px;
  object-fit: contain;
}
.chat-header-title {
  font-size: var(--font-size-sidebar);
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -1px;
}
.chat-header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}
.chat-header-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--text-primary);
  background: var(--input-bg);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s;
}
.chat-header-btn:hover:not(.disabled) {
  background: var(--bg-active);
}
.chat-header-btn.disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) transparent;
}
.chat-message {
  display: flex;
  gap: 12px;
  width: 100%;
}
.chat-message.user-message {
  flex-direction: row-reverse;
  justify-content: flex-start;
}
.chat-message.assistant-message {
  flex-direction: row;
}
.message-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
  margin-top: 4px;
}
.message-avatar img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.message-content-wrapper {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.user-message .message-content-wrapper {
  max-width: 75%;
  align-items: flex-end;
}
.assistant-message .message-content-wrapper {
  max-width: 85%;
}
.message-bubble {
  font-size: var(--font-size-message);
  line-height: 1.65;
  position: relative;
  font-family: 'Plus Jakarta Sans', 'Inter', -apple-system, sans-serif;
}
.user-message .message-bubble {
  background: var(--section-highlight);
  color: var(--text-primary);
  padding: 10px 16px;
  border-radius: 16px;
}
.assistant-message .message-bubble {
  background: transparent;
  color: var(--text-primary);
  padding: 0;
}
.message-actions {
  display: flex;
  gap: 12px;
  opacity: 0;
  transition: opacity 0.2s;
  color: var(--text-tertiary);
}
.chat-message:hover .message-actions {
  opacity: 1;
}
.message-action-btn {
  background: transparent;
  border: none;
  color: inherit;
  cursor: pointer;
  padding: 2px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s;
}
.message-action-btn:hover {
  color: var(--text-primary);
}
.tool-body-card {
  width: 100%;
  margin-top: 12px;
  border-radius: 12px;
  background: var(--surface-card);
  overflow: hidden;
}
.tool-body-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 12px 16px;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 600;
  font-family: inherit;
}
.tool-body-header-label {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
}
.tool-body-content {
  padding: 0 16px 16px;
}
.tool-body-content .flashcards-interface {
  height: auto;
  min-height: 420px;
}
.tool-body-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  background: var(--bg-tertiary);
}
.tool-body-item-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--section-highlight);
  color: var(--accent);
}
.tool-body-item-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.tool-body-item-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}
.tool-body-item-description {
  font-size: 12px;
  color: var(--text-tertiary);
  line-height: 1.4;
}
.ppq-card {
  width: 100%;
  margin-top: 12px;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  background: var(--surface-card);
  overflow: hidden;
}
.ppq-card-header {
  width: 100%;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px 16px;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-primary);
  font-family: inherit;
}
.ppq-card-content {
  padding: 0 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.ppq-card-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--section-highlight);
  color: var(--accent);
  font-size: 12px;
  font-weight: 600;
}
.ppq-card-paper {
  font-size: 12px;
  color: var(--text-tertiary);
  flex: 1;
  min-width: 0;
}
.ppq-card-marks {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
}
.ppq-card-caption {
  margin: 0;
  font-size: 13px;
  color: var(--text-primary);
  line-height: 1.5;
}
.ppq-card-preview {
  border-radius: 8px;
  overflow: hidden;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 120px;
}
.ppq-card-image {
  display: block;
  width: 100%;
  height: auto;
}
.ppq-card-status {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 24px 16px;
  font-size: 13px;
  color: var(--text-tertiary);
}
.ppq-card-error {
  color: var(--text-secondary);
}
.ppq-card-spinner {
  animation: ppq-spin 1s linear infinite;
  color: var(--accent);
}
@keyframes ppq-spin {
  to {
    transform: rotate(360deg);
  }
}
.ppq-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  align-self: flex-start;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
}
.ppq-card-link:hover {
  text-decoration: underline;
}
.chat-input-area {
  padding: 14px 28px 12px;
  background: var(--main-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.chat-timeline-container {
  width: 100%;
  max-width: 600px;
  height: 20px;
  position: relative;
  display: flex;
  align-items: center;
  margin-bottom: 4px;
}
.chat-timeline-line {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1.5px;
  background: var(--border-color);
  transform: translateY(-50%);
  z-index: 1;
}
.chat-timeline-dots {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 2;
}
.timeline-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--border-color);
}
.timeline-dot.active {
  background: #facc15;
  box-shadow: 0 0 8px rgba(250, 204, 21, 0.6);
  width: 6px;
  height: 6px;
}
.timeline-dot.mastered {
  background: #22c55e;
  box-shadow: 0 0 6px rgba(34, 197, 94, 0.5);
  width: 6px;
  height: 6px;
}
.chat-timeline-character {
  position: absolute;
  top: -12px;
  left: -12px;
  width: 24px;
  height: 24px;
  z-index: 3;
  pointer-events: none;
}
.chat-timeline-character img {
  width: 100%;
  height: 100%;
}
.chat-input-wrapper {
  width: 100%;
  max-width: 800px;
  display: flex;
  align-items: flex-end;
  gap: 12px;
  padding: 11px 18px;
  background: var(--input-bg);
  border: 1.5px solid var(--border-color);
  border-radius: 20px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.chat-input-wrapper:focus-within {
  border-color: #f97316;
  box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.08);
}
.chat-textarea {
  flex: 1;
  background: transparent;
  border: none;
  resize: none;
  padding: 6px 0;
  color: var(--text-primary);
  font-size: var(--font-size-message);
  font-family: 'Plus Jakarta Sans', 'Inter', -apple-system, sans-serif;
  max-height: 200px;
  outline: none;
  line-height: 1.55;
}
.chat-input-add-btn,
.chat-input-voice-btn {
  background: transparent;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  flex-shrink: 0;
}
.chat-input-add-btn:hover,
.chat-input-voice-btn:hover {
  color: var(--text-primary);
  background: var(--nav-active-bg);
}
.chat-footer-note {
  font-size: 11px;
  color: var(--text-faded);
  margin: 0;
  opacity: 0.8;
}
.centered-content {
  flex: 1;
  display: flex !important;
  flex-direction: column !important;
  align-items: center !important;
  justify-content: center !important;
  max-width: 860px !important;
  margin: 0 auto !important;
  width: 100%;
  height: 100%;
  padding: 32px 28px 24px;
  position: relative;
}
.ai-disclaimer {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  font-size: var(--font-size-small);
  color: var(--text-secondary);
  opacity: 0.7;
  white-space: nowrap;
}
.welcome-section {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  width: 100%;
  margin-bottom: 44px;
}
.welcome-icon {
  margin-bottom: 20px;
}
.welcome-icon img {
  width: 52px;
  height: 52px;
  object-fit: contain;
}
.welcome-greeting {
  font-size: 26px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
  letter-spacing: -0.5px;
  font-family: 'Plus Jakarta Sans', 'Inter', -apple-system, sans-serif;
}
.welcome-greeting .user-first-name {
  font-weight: 800;
}
.welcome-heading {
  font-size: clamp(36px, 5vw, 52px);
  font-weight: 800;
  color: var(--text-primary);
  margin: 4px 0 0;
  line-height: 1.08;
  letter-spacing: -2px;
  font-family: 'Plus Jakarta Sans', 'Inter', -apple-system, sans-serif;
}
.welcome-hint {
  font-size: 15px;
  color: var(--text-secondary);
  margin-top: 14px;
  max-width: 580px;
  line-height: 1.65;
  font-family: 'Plus Jakarta Sans', 'Inter', -apple-system, sans-serif;
  font-weight: 450;
}
.main-input-container {
  width: 100%;
  max-width: 100%;
  margin: 0 auto;
  position: relative;
  padding: 0;
  border-top: none;
}
.input-surface {
  background: var(--input-main-bg);
  border: 1px solid var(--border-color);
  border-radius: 22px;
  transition: all 0.2s;
  min-height: 100px;
  display: flex;
  flex-direction: column;
}
.input-surface:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}
.main-input-box {
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 16px 20px !important;
  display: grid !important;
  grid-template-areas: 'input input' 'left right' !important;
  grid-template-columns: 1fr auto !important;
  gap: 12px !important;
  align-items: stretch !important;
  position: relative;
  outline: none !important;
}
.main-input {
  grid-area: input !important;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: var(--font-size-message);
  padding: 8px 0 !important;
  outline: none !important;
  resize: none;
  line-height: 1.5;
  min-height: 40px !important;
  font-family: inherit;
  transition: height 0.1s ease-out;
}
.main-input::placeholder {
  color: var(--text-faded);
  opacity: 0.8;
}
.input-left-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  grid-area: left !important;
}
.input-right-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  grid-area: right !important;
  justify-content: flex-end;
}
.input-icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}
.input-icon-btn:hover {
  background: var(--nav-active-bg);
  color: var(--text-primary);
}
.send-button {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: var(--bg-primary);
  border: none;
  cursor: pointer;
  transition: all 0.2s;
}
.send-button:hover {
  transform: scale(1.05);
  opacity: 0.9;
}
.action-pills-container {
  display: flex;
  gap: 8px;
  margin-top: 32px;
  justify-content: center;
  flex-wrap: wrap;
  width: 100%;
}
.action-pill {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  border-radius: 24px;
  border: 1px solid var(--border-color);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}
.action-pill:hover,
.action-pill.active {
  background: var(--input-main-bg);
  border-color: var(--accent);
  color: var(--text-primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}
.pill-icon {
  font-size: var(--font-size-title);
}
.study-plan-options,
.memorize-options {
  margin-bottom: 32px;
  width: 100%;
  max-width: 900px;
}
.study-plan-header,
.memorize-header {
  margin-bottom: 16px;
  padding: 0 8px;
}
.study-plan-header h3,
.memorize-header h3 {
  margin: 0;
  font-size: var(--font-size-title);
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}
.memorize-cards-container {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: flex-start;
  width: 100%;
}
.memorize-card.tool-card {
  flex: 1;
  min-width: 280px;
  display: flex !important;
  align-items: center !important;
  gap: 20px !important;
  padding: 24px !important;
  background: var(--input-main-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  position: relative;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  text-align: left;
  cursor: pointer;
}
.memorize-card.tool-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.2);
  background: var(--nav-active-bg);
}
.memorize-card .tool-card-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: var(--font-size-xlarge);
  transition: all 0.3s ease;
}
.memory-palace-icon {
  background: linear-gradient(135deg, rgba(52, 152, 219, 0.15) 0%, rgba(52, 152, 219, 0.05) 100%);
  color: #3498db;
  border: 1px solid rgba(52, 152, 219, 0.2);
}
.acronym-icon {
  background: linear-gradient(135deg, rgba(231, 76, 60, 0.15) 0%, rgba(231, 76, 60, 0.05) 100%);
  color: #e74c3c;
  border: 1px solid rgba(231, 76, 60, 0.2);
}
.rhyme-icon {
  background: linear-gradient(135deg, rgba(46, 204, 113, 0.15) 0%, rgba(46, 204, 113, 0.05) 100%);
  color: #2ecc71;
  border: 1px solid rgba(46, 204, 113, 0.2);
}
.number-icon {
  background: linear-gradient(135deg, rgba(155, 89, 182, 0.15) 0%, rgba(155, 89, 182, 0.05) 100%);
  color: #9b59b6;
  border: 1px solid rgba(155, 89, 182, 0.2);
}
.story-icon {
  background: linear-gradient(135deg, rgba(241, 196, 15, 0.15) 0%, rgba(241, 196, 15, 0.05) 100%);
  color: #f1c40f;
  border: 1px solid rgba(241, 196, 15, 0.2);
}
.peg-icon {
  background: linear-gradient(135deg, rgba(230, 126, 34, 0.15) 0%, rgba(230, 126, 34, 0.05) 100%);
  color: #e67e22;
  border: 1px solid rgba(230, 126, 34, 0.2);
}
.memorize-card .tool-card-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.memorize-card .tool-card-info h3 {
  margin: 0 !important;
  font-size: 17px !important;
  font-weight: 700 !important;
  color: var(--text-primary);
}
.memorize-card .tool-card-info p {
  margin: 0 !important;
  font-size: 13px !important;
  color: var(--text-secondary) !important;
  line-height: 1.5 !important;
}
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  backdrop-filter: blur(8px);
  animation: fadeIn 0.3s ease;
}
.modal-content {
  background-color: var(--main-bg);
  border-radius: 16px;
  width: 95%;
  max-width: 850px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  overflow: hidden;
  border: 1px solid var(--border-color);
  animation: modalScaleUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
}
.modal-header h2 {
  font-size: var(--font-size-large);
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}
.modal-subtitle {
  font-size: var(--font-size-conversation);
  color: var(--text-secondary);
  margin-top: 2px;
}
.modal-close-btn {
  background: var(--section-highlight);
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  transition: all 0.2s;
}
.modal-body {
  padding: 0 24px 24px;
  overflow-y: auto;
  flex: 1;
}
.curriculum-section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 16px 0 12px;
}
.curriculum-section-header h3 {
  font-size: 10px;
  font-weight: 700;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.curriculum-filters {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
  overflow-x: auto;
  padding-bottom: 6px;
}
.filter-chip {
  min-width: 120px;
  padding: 8px 14px;
  background: var(--tool-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 2px;
  transition: all 0.2s;
}
.filter-label {
  font-size: var(--font-size-conversation);
  font-weight: 700;
  color: var(--text-primary);
}
.filter-desc {
  font-size: 10px;
  color: var(--text-secondary);
}
.curriculum-search-wrapper {
  position: relative;
  margin-bottom: 16px;
}
.curriculum-search-input {
  width: 100%;
  padding: 10px 14px 10px 38px;
  background: var(--input-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  color: var(--text-primary);
  font-size: var(--font-size-conversation);
  outline: none;
  transition: all 0.2s;
}
.curricula-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.curriculum-card {
  background: var(--tool-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px 20px;
  display: flex;
  justify-content: space-between;
  transition: all 0.3s;
}
.curriculum-badge {
  display: inline-flex;
  gap: 6px;
  margin-bottom: 8px;
}
.curriculum-card-info h3 {
  font-size: var(--font-size-title);
  font-weight: 700;
  margin-bottom: 8px;
}
.curriculum-card-info p {
  font-size: var(--font-size-conversation);
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 14px;
  max-width: 550px;
}
.curriculum-meta {
  display: flex;
  gap: 16px;
  color: var(--text-tertiary);
  font-size: 11px;
}
.curriculum-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  justify-content: center;
}
.btn-start-learning {
  background: var(--accent);
  color: #000;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 700;
  font-size: var(--font-size-conversation);
  display: flex;
  align-items: center;
  gap: 6px;
  border: none;
}
.btn-view-syllabus {
  background: var(--section-highlight);
  color: var(--text-primary);
  padding: 8px 20px;
  border-radius: 8px;
  font-weight: 600;
  font-size: var(--font-size-conversation);
}
.settings-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10002;
  backdrop-filter: blur(4px);
}
.settings-modal-overlay.show {
  display: flex;
  animation: fadeIn 0.2s ease;
}
.settings-modal {
  background-color: var(--sidebar-bg);
  border-radius: 16px;
  padding: 0;
  max-width: 900px;
  width: 90%;
  max-height: 85vh;
  height: 650px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  transform: scale(0.9);
  transition: transform 0.3s ease;
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.settings-modal-container {
  display: flex;
  height: 100%;
  overflow: hidden;
  flex: 1;
  min-height: 0;
}
#tools-modal-container {
  display: block;
  padding: 24px;
  min-height: 200px;
  overflow-y: auto;
  overflow-x: hidden;
}
.settings-modal-close {
  position: absolute;
  top: 24px;
  right: 24px;
  background: transparent;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  z-index: 10;
}
.settings-modal-close:hover {
  color: red;
}
.settings-sidebar {
  width: 260px;
  border-right: none;
  padding: 32px 16px;
  display: flex;
  flex-direction: column;
  background-color: var(--sidebar-bg);
}
.settings-title {
  font-size: var(--font-size-large);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 24px;
  padding: 0 16px;
}
.settings-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.settings-nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: 10px;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: var(--font-size-base);
  font-weight: 500;
  transition: all 0.2s;
}
.settings-nav-item:hover {
  background-color: var(--bg-active);
  color: var(--text-primary);
}
.settings-nav-item.active {
  background-color: var(--section-highlight);
  color: var(--text-primary);
}
.settings-content {
  flex: 1;
  background-color: transparent;
  padding: 32px 40px;
  overflow-y: auto;
}
.settings-section-header h3 {
  font-size: var(--font-size-large);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 24px;
}
.settings-section-subheader {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}
.settings-section-subheader h4 {
  margin: 0;
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--text-primary);
}
.settings-text-secondary {
  font-size: var(--font-size-small);
  color: var(--text-secondary);
  font-weight: 600;
}
.settings-account-info {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-bottom: 24px;
}
.settings-account-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background-color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  font-size: var(--font-size-xlarge);
  flex-shrink: 0;
}
.settings-account-details {
  flex: 1;
}
.settings-account-details h4 {
  color: var(--text-primary);
  font-size: var(--font-size-title);
  font-weight: 700;
  margin: 0 0 4px 0;
}
.settings-account-details p {
  color: var(--text-secondary);
  font-size: var(--font-size-base);
  margin: 0;
}
.settings-account-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}
.settings-account-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background-color: var(--input-bg);
  border-radius: 14px;
  border: none;
}
.settings-account-item-left {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-primary);
  font-size: var(--font-size-base);
}
.settings-account-item-left svg {
  width: 20px;
  height: 20px;
  color: var(--text-secondary);
}
.settings-btn {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: var(--font-size-base);
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
}
.settings-btn-secondary {
  background: var(--input-bg);
  color: var(--text-primary);
}
.settings-btn-secondary:hover {
  background: var(--nav-active-bg);
}
.settings-btn-primary {
  background: var(--accent);
  color: #000;
}
.settings-btn-primary:hover {
  background: var(--accent-hover, #ffdd33);
}
.appearance-modes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}
.appearance-mode-btn {
  background: var(--tool-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}
.appearance-mode-btn.active {
  border-color: var(--accent);
  color: var(--text-primary);
  background: var(--section-highlight);
}
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 22px;
}
.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}
.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #333;
  transition: 0.4s;
  border-radius: 34px;
}
.toggle-slider:before {
  position: absolute;
  content: '';
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: 0.4s;
  border-radius: 50%;
}
input:checked+.toggle-slider {
  background-color: var(--accent);
}
input:checked+.toggle-slider:before {
  transform: translateX(18px);
}
.voice-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
  margin-top: 24px;
}
.voice-card {
  position: relative;
  background: var(--input-bg);
  border: 2px solid transparent;
  border-radius: 16px;
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 180px;
}
.voice-card:hover {
  background: var(--section-highlight);
  transform: translateY(-2px);
}
.voice-card.selected {
  border-color: var(--accent);
}
.voice-card-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: var(--font-size-xlarge);
  font-weight: 700;
  flex-shrink: 0;
}
.voice-card-name {
  color: var(--text-primary);
  font-size: 16px;
  font-weight: 700;
}
.voice-card-region {
  color: var(--text-secondary);
  font-size: var(--font-size-small);
  font-weight: 600;
  text-transform: uppercase;
}
.voice-card-play {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
}
.voice-card-play:hover {
  background: var(--text-primary);
  color: #000;
}
.voice-card-check {
  position: absolute;
  top: 10px;
  left: 10px;
  width: 20px;
  height: 20px;
  background: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #000;
}
.appearance-modes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}
.appearance-mode-btn {
  background: var(--input-bg);
  border: none;
  border-radius: 16px;
  padding: 32px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
  flex: 1;
}
.appearance-mode-btn.active {
  background: var(--section-highlight);
  color: var(--text-primary);
}
.appearance-mode-btn svg {
  width: 48px;
  height: 48px;
}
.dark-theme-variants {
  margin-top: 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.theme-variant-card {
  position: relative;
  padding: 16px;
  background-color: var(--input-bg);
  border: 2px solid transparent;
  border-radius: 16px;
  cursor: pointer;
  transition: all 0.2s;
}
.theme-variant-card:hover {
  background-color: var(--section-highlight);
}
.theme-variant-card.active {
  border-color: var(--accent);
  background-color: rgba(255, 204, 0, 0.05);
}
.theme-preview {
  display: flex;
  gap: 4px;
  margin-bottom: 12px;
  height: 60px;
  border-radius: 8px;
  overflow: hidden;
}
.preview-sidebar {
  flex: 0 0 30%;
  background-color: #0f0f0f;
}
.preview-main {
  flex: 1;
  background-color: #0f0f0f;
}
.charcoal-theme-preview .preview-sidebar {
  background-color: #1a1a1a;
}
.charcoal-theme-preview .preview-main {
  background-color: #222222;
}
.theme-info h4 {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.theme-info p {
  font-size: var(--font-size-small);
  color: var(--text-secondary);
}
.theme-check {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--accent);
  border-radius: 50%;
  color: #000;
  opacity: 0;
  transition: opacity 0.2s;
}
.theme-variant-card.active .theme-check {
  opacity: 1;
}
.font-size-section {
  margin-top: 32px;
}
.font-size-options {
  display: flex;
  gap: 12px;
}
.font-size-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px;
  background-color: var(--input-bg);
  border: none;
  border-radius: 16px;
  cursor: pointer;
  transition: all 0.2s;
  flex: 1;
  color: var(--text-primary);
}
.font-size-btn:hover {
  background: var(--section-highlight);
}
.font-size-btn.active {
  background: var(--bg-active);
  border: 1px solid var(--accent);
}
.font-size-btn span:first-child {
  font-weight: 700;
}
.font-size-btn[data-size='small'] span:first-child {
  font-size: var(--font-size-small);
}
.font-size-btn[data-size='medium'] span:first-child {
  font-size: 16px;
}
.font-size-btn[data-size='large'] span:first-child {
  font-size: var(--font-size-large);
}
.font-size-btn[data-size='xlarge'] span:first-child {
  font-size: var(--font-size-xlarge);
}
.font-size-btn span:last-child {
  font-size: var(--font-size-small);
  color: var(--text-secondary);
  font-weight: 600;
}
.settings-input {
  background: var(--section-highlight);
  border: 1px solid var(--section-highlight);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: var(--font-size-conversation);
  padding: 8px 12px;
  cursor: pointer;
  outline: none;
  transition: all 0.2s;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  padding-right: 32px;
}
.settings-input:hover {
  background: var(--section-highlight);
  border-color: rgba(255, 255, 255, 0.12);
}
.settings-input:focus {
  border-color: var(--accent);
  background: var(--section-highlight);
}
.activity-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 24px;
}
.activity-card {
  background: var(--input-bg);
  padding: 24px;
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.activity-card-label {
  color: var(--text-secondary);
  font-size: var(--font-size-base);
  font-weight: 500;
}
.activity-card-value {
  color: var(--text-primary);
  font-size: 32px;
  font-weight: 700;
}
.recent-activity-container {
  margin-top: 32px;
}
.recent-activity-header {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}
.search-popup-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 11000;
  backdrop-filter: blur(12px);
  animation: fadeIn 0.2s ease;
}
.search-popup-content {
  background-color: var(--sidebar-bg);
  border-radius: 20px;
  width: 80%;
  max-width: 1400px;
  height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.6);
  overflow: hidden;
  border: 1px solid var(--border-color);
  animation: modalScaleUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.search-popup-content.minimized {
  width: 50%;
  height: 70vh;
}
.search-popup-header {
  position: relative;
  padding: 32px;
  display: flex;
  align-items: center;
}
.search-popup-input {
  width: 100%;
  padding: 16px 48px 16px 8px;
  background-color: transparent;
  border: none;
  color: var(--text-primary);
  font-size: var(--font-size-title);
  outline: none;
  font-weight: 500;
}
.search-popup-header .search-icon {
  position: absolute;
  right: 32px;
  left: auto;
  color: var(--text-tertiary);
}
.search-popup-split {
  display: flex;
  flex: 1;
  overflow: hidden;
}
.search-popup-sidebar {
  width: 380px;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  padding: 12px;
}
.search-popup-content.minimized .search-popup-sidebar {
  width: 100%;
  border-right: none;
}
.search-sidebar-section {
  margin-bottom: 24px;
}
.search-section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 12px;
  margin-bottom: 12px;
}
.search-section-header h3 {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 1px;
}
.show-all-link {
  font-size: 11px;
  color: var(--text-secondary);
  cursor: pointer;
}
.search-action-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background-color: var(--input-bg);
  border-radius: 12px;
  color: var(--text-primary);
  font-size: var(--font-size-message);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}
.search-action-item:hover {
  background-color: var(--nav-active-bg);
  transform: translateY(-1px);
}
.search-history-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s;
}
.search-history-item:hover,
.search-history-item.active {
  background-color: var(--bg-active);
}
.search-item-icon {
  width: 32px;
  height: 32px;
  background: var(--input-bg);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
}
.search-item-info {
  flex: 1;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.search-item-title {
  font-size: var(--font-size-base);
  color: var(--text-primary);
  font-weight: 500;
}
.search-item-time {
  font-size: 11px;
  color: var(--text-tertiary);
}
.search-popup-preview {
  flex: 1;
  display: flex;
  flex-direction: column;
  opacity: 1;
  transition: opacity 0.3s;
}
.search-popup-content.minimized .search-popup-preview {
  display: none;
}
.preview-placeholder {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  font-size: var(--font-size-message);
}
.preview-body {
  flex: 1;
  overflow-y: auto;
  padding: 32px 48px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.preview-message {
  max-width: 85%;
  padding: 16px 20px;
  border-radius: 16px;
  font-size: var(--font-size-base);
  line-height: 1.6;
}
.preview-message.user {
  align-self: flex-end;
  background-color: #007aff;
  color: white;
  border-bottom-right-radius: 4px;
}
.preview-message.assistant {
  align-self: flex-start;
  background-color: var(--tool-bg);
  color: var(--text-primary);
  border-bottom-left-radius: 4px;
}
.preview-footer {
  padding: 24px 32px;
  background-color: var(--sidebar-bg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.preview-actions-right {
  display: flex;
  gap: 12px;
}
.preview-btn {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: var(--font-size-conversation);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border-color);
  background: var(--nav-active-bg);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.2s;
}
.preview-btn.primary {
  background: var(--nav-active-bg);
}
.preview-btn.danger {
  color: #ff453a;
}
.preview-btn:hover {
  background: var(--section-highlight);
}
.kbd-hint {
  font-size: 11px;
  opacity: 0.5;
  font-weight: 400;
}
@keyframes modalScaleUp {
  from {
    opacity: 0;
    transform: translateY(30px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}
@keyframes modalSlideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.dropdown-menu {
  background: var(--input-main-bg);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 8px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  z-index: 10000;
  min-width: 180px;
}
.dropdown-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: var(--font-size-base);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.2s;
  font-weight: 500;
  position: relative;
}
.dropdown-item:hover {
  background: var(--nav-active-bg);
}
.dropdown-item svg {
  width: 18px;
  height: 18px;
  opacity: 0.9;
}
.attach-dropdown-menu {
  position: absolute;
  bottom: calc(100% + 12px);
  left: 0;
  min-width: 220px;
  animation: fadeInSlideUp 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}
.dropdown-item .chevron-right {
  margin-left: auto;
  opacity: 0.5;
}
.recent-files-preview {
  position: absolute;
  left: calc(100% + 8px);
  bottom: 0;
  background: var(--input-main-bg) !important;
  backdrop-filter: blur(16px) !important;
  border: 1px solid var(--border-color) !important;
  border-radius: 12px !important;
  padding: 8px !important;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2) !important;
  min-width: 280px;
  display: none;
  z-index: 10001;
}
.dropdown-item.has-submenu:hover .recent-files-preview {
  display: block;
}
.recent-file-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 6px;
  transition: all 0.2s;
  cursor: pointer;
}
.recent-file-item:hover {
  background: var(--nav-active-bg);
}
.recent-file-info {
  display: flex;
  flex-direction: column;
}
.recent-file-name {
  font-size: var(--font-size-conversation);
  font-weight: 500;
  color: var(--text-primary);
}
.recent-file-meta {
  font-size: 11px;
  color: var(--text-secondary);
}
.delete-card {
  width: 500px;
  max-width: 90vw;
  animation: modalSlideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.delete-warning {
  background: var(--input-bg);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.delete-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(239, 68, 68, 0.12);
  color: #ef4444;
  font-weight: 700;
  font-size: var(--font-size-small);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  width: fit-content;
}
.delete-description {
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
}
.delete-list {
  padding-left: 18px;
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.6;
}
.delete-confirm-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 8px;
}
.delete-label {
  color: var(--text-primary);
  font-size: var(--font-size-base);
  font-weight: 600;
}
.delete-input {
  width: 100%;
  padding: 12px 16px;
  background: var(--sidebar-bg);
  border: 2px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: var(--font-size-message);
  font-weight: 500;
  outline: none;
  transition: all 0.2s;
}
.delete-input::placeholder {
  color: var(--text-faded);
  font-weight: 400;
}
.delete-input:focus {
  border-color: #ef4444;
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}
.delete-error {
  color: #ef4444;
  font-size: var(--font-size-conversation);
  margin-top: 4px;
}
.delete-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 20px;
}
.delete-cancel-btn {
  padding: 10px 24px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: transparent;
  color: var(--text-primary);
  cursor: pointer;
  font-weight: 600;
  font-size: var(--font-size-base);
  transition: all 0.2s;
}
.delete-cancel-btn:hover {
  background: var(--nav-active-bg);
}
.delete-confirm-btn {
  padding: 10px 24px;
  border-radius: 10px;
  border: none;
  background: #ef4444;
  color: white;
  cursor: pointer;
  font-weight: 600;
  font-size: var(--font-size-base);
  transition: all 0.2s;
}
.delete-confirm-btn:hover {
  opacity: 0.9;
}
.share-card {
  background: var(--sidebar-bg);
  width: 100%;
  max-width: 520px;
  border-radius: 20px;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-color);
  overflow: hidden;
  animation: modalSlideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  padding: 32px;
}
.share-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}
.share-card-header h2 {
  font-size: 22px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}
.share-card-close {
  background: var(--nav-active-bg);
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 8px;
  border-radius: 10px;
  transition: all 0.2s;
  display: flex;
}
.share-card-close:hover {
  background: var(--bg-active);
  color: var(--text-primary);
}
.share-card-body {
  display: flex;
  flex-direction: column;
  gap: 32px;
}
.share-chat-preview {
  background: var(--input-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 24px;
  max-height: 280px;
  overflow-y: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.share-chat-preview::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 80px;
  background: linear-gradient(transparent, var(--input-bg));
  pointer-events: none;
}
.preview-message {
  font-size: 14.5px;
  line-height: 1.5;
  padding: 12px 16px;
  border-radius: 16px;
  max-width: 85%;
}
.preview-message.user {
  align-self: flex-end;
  background: var(--nav-active-bg);
  color: var(--text-primary);
  border-bottom-right-radius: 4px;
}
.preview-message.assistant {
  align-self: flex-start;
  background: transparent;
  color: var(--text-secondary);
  padding-left: 0;
}
.preview-loading {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100px;
  color: var(--text-tertiary);
  font-size: var(--font-size-base);
}
.share-actions-row {
  display: flex;
  justify-content: space-around;
  align-items: center;
}
.share-action-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  background: none;
  border: none;
  cursor: pointer;
  transition: transform 0.2s;
}
.share-action-item:hover {
  transform: translateY(-4px);
}
.action-icon {
  width: 56px;
  height: 56px;
  background: var(--nav-active-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
}
.share-action-item:hover .action-icon,
.share-action-item.active .action-icon {
  background: var(--accent);
  color: white;
}
.share-action-item.active span {
  color: var(--accent);
}
.share-action-item span {
  font-size: var(--font-size-small);
  font-weight: 500;
  color: var(--text-secondary);
}
.bug-report-modal {
  background: var(--main-bg);
  border-radius: 12px;
  width: 90%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  animation: modalSlideIn 0.3s ease-out;
}
@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}
.bug-report-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px;
}
.bug-report-modal-header h2 {
  font-size: var(--font-size-xlarge);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}
.bug-report-modal-close {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: all 0.2s;
}
.bug-report-modal-close:hover {
  background: var(--nav-active-bg);
  color: var(--text-primary);
}
.bug-report-modal-body {
  padding: 24px;
}
.bug-report-field {
  margin-bottom: 20px;
}
.bug-report-field label {
  display: block;
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.bug-report-field .required {
  color: #ff3b30;
}
.bug-report-field input,
.bug-report-field textarea,
.bug-report-field select {
  width: 100%;
  padding: 12px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: var(--font-size-base);
  font-family: inherit;
  transition: all 0.2s;
  box-sizing: border-box;
}
.bug-report-field input:focus,
.bug-report-field textarea:focus,
.bug-report-field select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(74, 116, 232, 0.1);
}
.bug-report-field textarea {
  resize: vertical;
  min-height: 120px;
}
.bug-report-toggle-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}
.bug-report-toggle-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
}
.bug-report-toggle-hint {
  font-size: var(--font-size-small);
  color: var(--text-faded);
  font-weight: 400;
}
.bug-report-switch {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 24px;
  cursor: pointer;
}
.bug-report-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}
.bug-report-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--input-border);
  transition: 0.3s;
  border-radius: 24px;
}
.bug-report-slider:before {
  position: absolute;
  content: '';
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: 0.3s;
  border-radius: 50%;
}
.bug-report-switch input:checked+.bug-report-slider {
  background-color: var(--accent);
}
.bug-report-switch input:checked+.bug-report-slider:before {
  transform: translateX(24px);
}
.bug-report-switch input:focus+.bug-report-slider {
  box-shadow: 0 0 0 3px rgba(74, 116, 232, 0.1);
}
.bug-report-file-upload {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.bug-report-file-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--input-bg);
  border: 1px dashed var(--input-border);
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: var(--font-size-base);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  width: 100%;
  justify-content: center;
}
.bug-report-file-btn:hover {
  background: var(--nav-active-bg);
  border-color: var(--accent);
  color: var(--text-primary);
}
.bug-report-file-preview {
  position: relative;
  width: 100%;
  max-width: 400px;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border-color);
}
.bug-report-file-preview img {
  width: 100%;
  height: auto;
  display: block;
}
.bug-report-file-remove {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(0, 0, 0, 0.7);
  color: white;
  border: none;
  border-radius: 50%;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
}
.bug-report-file-remove:hover {
  background: rgba(0, 0, 0, 0.9);
}
.bug-report-file-hint {
  font-size: var(--font-size-small);
  color: var(--text-faded);
  margin: 4px 0 0 0;
}
.bug-report-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  margin-top: 24px;
  padding-top: 24px;
}
.bug-report-btn {
  padding: 10px 20px;
  border-radius: 8px;
  font-size: var(--font-size-base);
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 8px;
}
.bug-report-btn-cancel {
  background: transparent;
  color: var(--text-secondary);
}
.bug-report-btn-cancel:hover {
  background: var(--nav-active-bg);
  color: var(--text-primary);
}
.bug-report-btn-submit {
  background: var(--accent);
  color: white;
}
.bug-report-btn-submit:hover:not(:disabled) {
  background: var(--accent-hover);
}
.bug-report-btn-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}
.bug-report-btn-primary {
  background: var(--accent);
  color: white;
  margin: 0 auto;
}
.bug-report-btn-primary:hover {
  background: var(--accent-hover);
}
.bug-report-success {
  text-align: center;
  padding: 40px 24px;
}
.bug-report-success-icon {
  color: #34c759;
  margin-bottom: 16px;
  display: flex;
  justify-content: center;
}
.bug-report-success h3 {
  font-size: var(--font-size-large);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 12px 0;
}
.bug-report-success p {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  margin: 0 0 24px 0;
  line-height: 1.5;
}
.dm-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 3000;
  padding: 16px;
  backdrop-filter: blur(12px);
}
.dm-dialog {
  width: 100%;
  max-width: 520px;
  background: var(--sidebar-bg);
  border-radius: 14px;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.45);
  overflow: hidden;
  border: 1px solid var(--border-color);
}
.dm-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 18px;
}
.dm-header h2 {
  margin: 0;
  font-size: var(--font-size-title);
  color: var(--text-primary);
}
.dm-close {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: var(--font-size-large);
  cursor: pointer;
  padding: 4px 6px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  transition: all 0.2s;
}
.dm-close:hover {
  background: var(--nav-active-bg);
  color: var(--text-primary);
}
.dm-body {
  padding: 16px 18px 18px 18px;
}
.dm-body-scrollable {
  height: 450px;
  overflow-y: auto;
  padding: 20px;
}
.dm-body-scrollable::-webkit-scrollbar {
  width: 6px;
}
.dm-body-scrollable::-webkit-scrollbar-track {
  background: transparent;
}
.dm-body-scrollable::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 10px;
}
.dm-section-header {
  margin-bottom: 12px;
}
.dm-section-header h4 {
  color: var(--text-primary);
  font-size: var(--font-size-message);
  font-weight: 600;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 10px;
}
.dm-input {
  width: 100%;
  padding: 12px 16px;
  background: var(--main-bg);
  border: 2px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: var(--font-size-message);
  font-weight: 500;
  outline: none;
  transition: all 0.2s;
}
.dm-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(255, 196, 0, 0.15);
}
.dm-btn {
  border: none;
  border-radius: 8px;
  padding: 10px 14px;
  font-weight: 600;
  cursor: pointer;
  font-size: var(--font-size-base);
  transition: all 0.2s;
}
.dm-btn-primary {
  background: var(--accent);
  color: #000;
}
.dm-btn-secondary {
  background: var(--input-bg);
  color: var(--text-primary);
}
.dm-btn-secondary:hover {
  background: var(--nav-active-bg);
}
.dm-tabs {
  display: flex;
  gap: 24px;
  padding: 0 20px;
  border-bottom: 1px solid var(--border-color);
}
.dm-tab {
  padding: 12px 4px;
  color: var(--text-secondary);
  font-size: var(--font-size-base);
  font-weight: 500;
  cursor: pointer;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
  outline: none;
  position: relative;
  top: 1px;
}
.dm-tab:hover {
  color: var(--text-primary);
}
.dm-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 600;
}
@keyframes modalIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}
.account-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 12000;
  backdrop-filter: blur(8px);
  animation: fadeIn 0.2s ease;
}
.account-modal-wrapper {
  background-color: var(--tool-bg);
  width: 85%;
  max-width: 1200px;
  height: 75vh;
  border-radius: 24px;
  position: relative;
  border: 1px solid var(--border-color);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  animation: modalScaleUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.account-modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  background: var(--main-bg);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10;
  transition: all 0.2s;
}
.account-modal-close:hover {
  background: var(--nav-active-bg);
  transform: rotate(90deg);
}
.account-modal-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 40px;
}
.account-container {
  max-width: 1120px;
  margin: 0 auto;
}
.profile-header {
  display: flex;
  align-items: center;
  gap: 24px;
  padding-bottom: 32px;
}
.avatar-large {
  width: 100px;
  height: 100px;
  background-color: var(--accent);
  color: #000;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  font-weight: bold;
  flex-shrink: 0;
}
.user-meta h1 {
  font-size: var(--font-size-xlarge);
  margin: 0;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}
.user-meta p {
  color: var(--text-secondary);
  font-size: var(--font-size-base);
  margin: 4px 0 12px 0;
}
.plan-pill {
  display: inline-flex;
  background: rgba(255, 196, 0, 0.1);
  color: var(--accent);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: var(--font-size-small);
  font-weight: 600;
  border: 1px solid var(--accent);
}
.tabs {
  display: flex;
  gap: 16px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--border-color);
}
.tab {
  padding: 12px 24px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: var(--font-size-base);
  font-weight: 500;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}
.tab:hover {
  color: var(--text-primary);
  background: var(--nav-active-bg);
}
.tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.tab-content {
  display: none;
}
.tab-content.active {
  display: block;
}
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}
.stat-box {
  background: var(--main-bg);
  border: 1px solid var(--border-color);
  padding: 24px;
  border-radius: 16px;
}
.stat-label {
  color: var(--text-faded);
  font-size: var(--font-size-small);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
  display: block;
}
.stat-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
}
.stat-subtext {
  font-size: var(--font-size-small);
  color: var(--text-secondary);
  margin-top: 4px;
  display: block;
}
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
  gap: 24px;
}
.card {
  background: var(--main-bg);
  border-radius: 20px;
  padding: 30px;
  border: 1px solid var(--border-color);
}
.card-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--accent);
}
.data-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid var(--border-color);
}
.data-row:last-child {
  border-bottom: none;
}
.label {
  color: var(--text-secondary);
  font-size: var(--font-size-base);
}
.value {
  font-weight: 500;
  font-size: var(--font-size-base);
  color: var(--text-primary);
}
.btn-group {
  margin-top: 24px;
}
.account-overview-btn-primary {
  width: 100%;
  padding: 12px;
  background: var(--accent);
  color: #000;
  border: none;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
}
.account-overview-btn-primary:hover {
  background: var(--surface-card);
}
.upgrade-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--sidebar-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 13000;
  animation: fadeIn 0.3s ease;
  overflow: hidden;
}
.upgrade-modal-content {
  width: 100%;
  height: 100%;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  padding: 80px 40px;
}
.upgrade-modal-close {
  position: fixed;
  top: 30px;
  right: 30px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  z-index: 13001;
  transition: all 0.2s;
  padding: 8px;
}
.upgrade-modal-close:hover {
  color: var(--text-primary);
  transform: rotate(90deg);
}
.pricing-header {
  text-align: center;
  margin-bottom: 40px;
}
.pricing-header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
  letter-spacing: -1px;
}
.pricing-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}
.pricing-toggle-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin: 30px 0 40px;
  font-weight: 600;
}
.pricing-toggle-container .active {
  color: var(--text-primary);
}
.pricing-toggle-container span:not(.active) {
  color: var(--text-faded);
}
.discount-badge {
  background: var(--accent);
  color: #000;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 50px;
  margin-left: 5px;
}
.pricing-switch {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 24px;
}
.pricing-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}
.pricing-slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: var(--input-bg);
  transition: 0.3s;
  border-radius: 34px;
  border: 1px solid var(--border-color);
}
.pricing-slider:before {
  position: absolute;
  content: '';
  height: 18px;
  width: 18px;
  left: 2px;
  bottom: 2px;
  background-color: var(--surface-card);
  transition: 0.3s;
  border-radius: 50%;
}
input:checked+.pricing-slider {
  background-color: var(--accent);
  border-color: var(--accent);
}
input:checked+.pricing-slider:before {
  transform: translateX(24px);
  background-color: #000;
}
.upgrade-plans-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  padding: 5px;
}
.upgrade-plan-card {
  background: var(--section-highlight);
  border: 1px solid var(--border-color);
  padding: 40px 30px;
  border-radius: 12px;
  position: relative;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
}
.upgrade-plan-card:hover {
  transform: translateY(-4px);
  background: var(--section-highlight);
  border-color: var(--text-faded);
}
.upgrade-plan-card.featured {
  border-color: var(--accent);
  background: var(--section-highlight);
  box-shadow: 0 0 0 1px var(--accent);
}
.plan-badge-top {
  position: absolute;
  top: 15px;
  right: 15px;
  background: var(--accent);
  color: #000;
  font-size: 11px;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.plan-name {
  font-size: 1.25rem;
  margin-bottom: 8px;
  font-weight: 700;
  color: var(--text-primary);
}
.plan-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 30px;
  min-height: 40px;
  line-height: 1.5;
}
.plan-price-large {
  margin-bottom: 30px;
  display: flex;
  align-items: baseline;
}
.price-currency {
  font-size: 1.25rem;
  font-weight: 600;
  margin-right: 2px;
  color: var(--text-primary);
}
.price-amount-large {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
}
.price-period {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-left: 4px;
}
.plan-features-list {
  list-style: none;
  padding: 0;
  margin: 0 0 30px 0;
  flex-grow: 1;
}
.feature-item {
  margin-bottom: 14px;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-secondary);
}
.feature-item svg {
  color: var(--accent);
  flex-shrink: 0;
}
.feature-item.disabled {
  opacity: 0.3;
  text-decoration: line-through;
}
.upgrade-action-btn {
  padding: 12px 20px;
  border-radius: 10px;
  border: none;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 14px;
  width: 100%;
}
.upgrade-action-btn.primary {
  background-color: var(--section-highlight);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}
.upgrade-action-btn.primary:hover:not(:disabled) {
  background-color: rgba(255, 255, 255, 0.1);
}
.upgrade-action-btn.secondary {
  background-color: var(--accent);
  color: #000;
}
.upgrade-action-btn.secondary:hover:not(:disabled) {
  background-color: #ffd600;
  transform: translateY(-1px);
}
.upgrade-footer-note {
  margin-top: 40px;
  font-size: 0.9rem;
  color: var(--text-faded);
  text-align: center;
}
.timeline-container {
  position: fixed;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 75vh;
  max-height: 480px;
  z-index: 1050;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease,
    visibility 0.3s ease;
  visibility: hidden;
  pointer-events: auto;
  -webkit-mask-image: linear-gradient(to bottom, transparent, black 15%, black 85%, transparent);
  mask-image: linear-gradient(to bottom, transparent, black 15%, black 85%, transparent);
  overflow: hidden;
}
.main-content.has-chat .timeline-container {
  opacity: 1;
  visibility: visible !important;
}
.timeline-scroller {
  position: absolute;
  top: 0;
  right: 0;
  width: 100%;
  height: 100%;
  transition: transform 0.3s cubic-bezier(0.2, 0, 0, 1);
  z-index: 2;
}
.timeline-tick {
  position: absolute;
  right: 12px;
  width: 4px;
  height: 2px;
  background: var(--text-faded);
  border-radius: 1px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  transform-origin: right center;
  z-index: 5;
}
.timeline-tick::after {
  content: '';
  position: absolute;
  right: -8px;
  top: -6px;
  bottom: -6px;
  width: 40px;
  background: transparent;
}
.timeline-tick.user-tick {
  width: 10px;
  background: rgba(255, 255, 255, 0.4);
}
.timeline-tick:hover {
  background: var(--accent) !important;
  width: 18px !important;
  z-index: 10;
}
.timeline-tick.active {
  background: var(--accent);
  width: 14px;
  height: 2px;
  box-shadow: 0 0 8px var(--accent);
  opacity: 1 !important;
}
.timeline-tooltip {
  position: fixed;
  right: 48px;
  background: var(--input-bg);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 10px 14px;
  border-radius: 12px;
  font-size: 13px;
  width: 260px;
  pointer-events: none;
  opacity: 0;
  transform: translateX(8px);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  z-index: 2000;
  line-height: 1.5;
}
.timeline-tooltip.show {
  opacity: 1;
  transform: translateX(0);
}
.timeline-tooltip-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
  font-weight: 600;
  color: var(--text-secondary, #999);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.timeline-tooltip-body {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
}
.timeline-simple {
  position: relative;
  width: 100%;
  height: 28px;
  margin-bottom: 2px;
  z-index: 10;
}
.timeline-line {
  position: absolute;
  top: 50%;
  left: 14px;
  right: 14px;
  height: 2px;
  transform: translateY(-50%);
  background: var(--input-border);
  border-radius: 99px;
  z-index: 1;
}
.timeline-dots {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 14px;
  right: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 5;
}
.timeline-simple .timeline-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  transition: all 0.25s ease;
  flex-shrink: 0;
  cursor: pointer;
  position: relative;
}
.timeline-simple .timeline-dot.concept {
  width: 11px;
  height: 11px;
}
.timeline-simple .timeline-dot.completed {
  background: var(--accent);
  box-shadow: 0 0 6px var(--accent);
  @supports (color: color-mix(in lab, red, red)) {
    box-shadow: 0 0 6px color-mix(in srgb, var(--accent) 50%, transparent);
  }
}
.timeline-simple .timeline-dot.current {
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent),
    0 0 10px var(--accent);
  @supports (color: color-mix(in lab, red, red)) {
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent),
    0 0 10px var(--accent);
  }
  transform: scale(1.4);
  z-index: 10;
}
.timeline-character {
  position: absolute;
  top: 50%;
  width: 24px;
  height: 24px;
  transform: translate(-50%, -50%);
  z-index: 20;
  transition: left 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
  pointer-events: none;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}
.timeline-character img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.tl-dot-tip {
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translate(-50%, -8px);
  background: var(--dropdown-bg);
  color: var(--text-primary);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 500;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: all 0.2s;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  z-index: 100;
  border: 1px solid var(--border-color);
}
.timeline-dot:hover .tl-dot-tip {
  opacity: 1;
  transform: translate(-50%, -12px);
}
.custom-scrollbar::-webkit-scrollbar {
  width: 6px;
}
.custom-scrollbar::-webkit-scrollbar-track {
  background: transparent;
}
.custom-scrollbar::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 10px;
}
.custom-scrollbar::-webkit-scrollbar-thumb:hover {
  background: var(--nav-active-bg);
}
.tools-modal-header {
  margin-bottom: 24px;
}
.tools-modal-header h2 {
  color: var(--text-primary);
  font-size: 24px;
  font-weight: 600;
  margin: 0;
}
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.tool-card {
  background-color: var(--input-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
  position: relative;
  transition: all 0.2s ease;
  cursor: pointer;
}
.tool-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  border-color: var(--text-faded);
}
.tool-card.available {
  border-color: var(--accent);
}
.tool-card.coming-soon {
  opacity: 0.7;
  cursor: not-allowed;
}
.tool-status-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}
.tool-card.available .tool-status-badge {
  background-color: rgba(255, 196, 0, 0.1);
  color: var(--accent);
}
.tool-name {
  color: var(--text-primary);
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 4px 0;
}
.tool-description {
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.5;
  margin: 0;
}
.chat-window-wrapper {
  display: flex;
  width: 100%;
  height: 100vh;
  overflow: hidden;
  background: var(--main-bg);
}
.chat-main-area.tool-open {
  width: 40% !important;
  flex: none !important;
}
.tool-interface-panel {
  flex: 1;
  display: none;
  flex-direction: column;
  background: var(--main-bg);
  height: 100%;
  overflow: hidden;
  animation: slideInRight 0.3s ease;
}
.tool-interface-panel.show {
  display: flex;
}
@keyframes slideInRight {
  from {
    transform: translateX(100%);
  }
  to {
    transform: translateX(0);
  }
}
.tool-interface-header {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 16px 14px;
  height: 55px;
  flex-shrink: 0;
}
.tool-interface-title-block {
  grid-column: 2;
  text-align: center;
}
.tool-interface-title-block h2 {
  margin: 0;
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
}
.tool-interface-subtitle {
  margin: 4px 0 0;
  font-size: 13px;
  color: var(--text-secondary);
}
.tool-interface-header-actions {
  grid-column: 3;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
}
.tool-interface-close,
.tool-interface-back {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}
.tool-interface-close:hover,
.tool-interface-back:hover {
  background: var(--nav-active-bg);
  color: var(--text-primary);
}
.tool-interface-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}
.cornell-container {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 5px;
}
.cornell-action-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--accent);
  color: #000;
  border: none;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.cornell-action-btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}
.cornell-notes-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 20px;
  width: 100%;
}
.cornell-note-card {
  background: var(--input-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 20px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.cornell-note-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}
.cornell-note-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}
.cornell-note-title {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
}
.cornell-note-actions {
  display: flex;
  gap: 4px;
}
.cornell-note-action-btn {
  background: transparent;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: all 0.2s;
}
.cornell-note-action-btn:hover {
  color: var(--text-primary);
  background: var(--section-highlight);
}
.cornell-note-delete-btn:hover {
  color: #ff4b4b;
}
.cornell-note-preview {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.cornell-note-footer {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid var(--section-highlight);
}
.eisenhower-matrix {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: 16px;
  width: 100%;
  flex: 1;
  min-height: 0;
  padding: 0 10px 10px;
  box-sizing: border-box;
}
.eisenhower-quadrant {
  background: var(--nav-active-bg);
  border-radius: 20px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
  min-height: 0;
  height: 100%;
  position: relative;
  overflow: hidden;
}
.eisenhower-quadrant.drag-over {
  background: rgba(var(--accent-rgb, 59, 130, 246), 0.1);
  border-color: var(--accent);
  transform: scale(1.01);
}
.eisenhower-quadrant-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}
.eisenhower-quadrant-title {
  display: flex;
  align-items: center;
  gap: 10px;
}
.eisenhower-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.eisenhower-quadrant-header h3 {
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  margin: 0;
}
.eisenhower-task-count {
  font-size: 12px;
  color: var(--text-secondary);
  background: var(--input-bg);
  padding: 2px 8px;
  border-radius: 10px;
}
.eisenhower-task-list {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 50px;
  overflow-y: auto;
}
.eisenhower-task-card {
  background: var(--surface-card);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 12px;
  cursor: grab;
  transition: all 0.2s ease;
  position: relative;
  user-select: none;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}
.eisenhower-task-card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}
.eisenhower-task-card.dragging {
  opacity: 0.5;
  cursor: grabbing;
}
.eisenhower-task-card-title {
  font-size: 14px;
  color: var(--text-primary);
  margin-top: 4px;
  padding-right: 45px;
  word-break: break-word;
}
.eisenhower-task-card-actions {
  position: absolute;
  top: 8px;
  right: 8px;
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity 0.2s ease;
  z-index: 2;
}
.eisenhower-task-card:hover .eisenhower-task-card-actions {
  opacity: 1;
}
.eisenhower-task-action-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}
.eisenhower-task-action-btn:hover {
  background: var(--nav-active-bg);
}
.eisenhower-task-action-btn.delete-task:hover {
  color: #ef4444;
}
.eisenhower-add-task {
  margin-top: auto;
}
.eisenhower-add-input {
  width: 100%;
  background: var(--bg-hover);
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 8px 12px;
  color: var(--text-primary);
  font-size: 13px;
  outline: none;
  transition: all 0.2s ease;
}
.eisenhower-add-input:focus {
  background: var(--input-bg);
  border-color: var(--accent);
}
.eisenhower-task-edit-input {
  width: 100%;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 14px;
  padding: 0;
  margin-top: 4px;
  padding-right: 45px;
  resize: none;
  outline: none;
  font-family: inherit;
  line-height: inherit;
  min-height: auto;
  overflow: hidden;
}
.eisenhower-quadrant[data-status='do'] {
  border-top: 4px solid #ff3b30;
}
.eisenhower-quadrant[data-status='schedule'] {
  border-top: 4px solid #0071e3;
}
.eisenhower-quadrant[data-status='delegate'] {
  border-top: 4px solid #ff9500;
}
.eisenhower-quadrant[data-status='eliminate'] {
  border-top: 4px solid #8e8e93;
}
.eisenhower-quadrant[data-status='do'] .eisenhower-task-card {
  background: rgba(255, 59, 48, 0.08);
  border-left: 4px solid #ff3b30;
}
.eisenhower-quadrant[data-status='schedule'] .eisenhower-task-card {
  background: rgba(0, 113, 227, 0.08);
  border-left: 4px solid #0071e3;
}
.eisenhower-quadrant[data-status='delegate'] .eisenhower-task-card {
  background: rgba(255, 149, 0, 0.08);
  border-left: 4px solid #ff9500;
}
.eisenhower-quadrant[data-status='eliminate'] .eisenhower-task-card {
  background: rgba(142, 142, 147, 0.08);
  border-left: 4px solid #8e8e93;
}
.quiz-interface {
  width: 100%;
  height: 100%;
  padding: 20px;
}
.quiz-container {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
}
.quiz-list-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}
.quiz-card-modern {
  background: var(--section-highlight);
  border-radius: 24px;
  padding: 24px;
  cursor: pointer;
  transition: border-color 0.15s;
  display: flex;
  flex-direction: column;
  gap: 20px;
  border: 1px solid transparent;
}
.quiz-card-modern:hover {
  border-color: var(--accent);
}
.quiz-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}
.quiz-card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.quiz-card-topic {
  font-size: 14px;
  color: var(--text-secondary);
}
.quiz-card-actions {
  display: flex;
  gap: 8px;
}
.quiz-action-btn {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: none;
  background: var(--section-highlight);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}
.quiz-action-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}
.quiz-action-btn-delete:hover {
  background: rgba(255, 59, 48, 0.15);
  color: #ff3b30;
}
.quiz-card-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.quiz-card-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 12px 8px;
  background: var(--section-highlight);
  border-radius: 16px;
}
.quiz-card-stat-icon {
  font-size: 16px;
}
.quiz-card-stat-value {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
}
.quiz-card-stat-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-faded);
}
.quiz-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
}
.quiz-card-difficulty {
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}
.quiz-card-last-attempt {
  font-size: 12px;
  color: var(--text-faded);
}
.quiz-progress-section {
  margin-bottom: auto;
  padding-top: 20px;
}
.quiz-progress-text {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 8px;
  font-weight: 500;
}
.quiz-progress-bar {
  height: 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  overflow: hidden;
}
.quiz-progress-fill {
  height: 100%;
  background: var(--accent);
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.quiz-quiz-card {
  background: var(--section-highlight);
  border-radius: 32px;
  padding: 40px;
  margin-bottom: 24px;
  box-shadow: none;
}
.quiz-question-number {
  color: var(--accent);
  font-weight: 700;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}
.quiz-question-text {
  font-size: 22px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-primary);
  margin-bottom: 32px;
}
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.quiz-option {
  padding: 18px 24px;
  background: var(--nav-active-bg);
  border-radius: 16px;
  cursor: pointer;
  transition: border-color 0.15s;
  font-size: 16px;
  color: var(--text-primary);
  border: 1px solid transparent;
}
.quiz-option:hover {
  border-color: var(--accent);
}
.quiz-option.selected {
  border-color: var(--accent);
}
.quiz-controls {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: auto;
}
.quiz-btn {
  padding: 14px 28px;
  border-radius: 14px;
  font-weight: 600;
  font-size: 15px;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 120px;
}
.quiz-btn-primary {
  background: var(--accent);
  color: white;
}
.quiz-btn-primary:hover {
  box-shadow: 0 0 0 2px var(--accent);
}
.quiz-btn-secondary {
  background: var(--section-highlight);
  color: var(--text-primary);
}
.quiz-btn-secondary:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.1);
}
.quiz-btn-secondary:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}
.mindmap-toggle-icon {
  fill: #ffffff;
  font-size: 14px;
  font-weight: bold;
  pointer-events: none;
}
.mindmap-controls {
  position: absolute;
  bottom: 32px;
  right: 32px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 100;
}
.mindmap-control-btn {
  width: 44px;
  height: 44px;
  background: rgba(43, 45, 49, 0.8);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}
.mindmap-control-btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(var(--accent-rgb), 0.3);
}
.mindmap-control-btn svg {
  width: 20px;
  height: 20px;
}
.leitner-interface {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
}
.leitner-container {
  width: 100%;
  padding: 20px;
}
.leitner-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}
.leitner-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}
.leitner-boxes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}
.leitner-box-card {
  background: var(--nav-active-bg);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 28px;
  height: 40vh;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.leitner-box-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}
.leitner-box-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.leitner-box-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}
.leitner-box-count {
  background: var(--bg-hover);
  color: var(--text-primary);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
}
.leitner-box-schedule {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
}
.leitner-study-btn {
  width: 100%;
  padding: 12px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 14px;
  transition: all 0.2s ease;
  border: none;
  cursor: pointer;
}
.leitner-study-btn.active {
  background: var(--accent);
  color: #fff;
}
.leitner-study-btn.active:hover {
  opacity: 0.9;
  transform: scale(1.02);
}
.leitner-study-btn.inactive {
  background: var(--bg-hover);
  color: var(--text-faded);
  cursor: not-allowed;
}
.leitner-study-view {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
  height: 100%;
  width: 100%;
}
.leitner-study-container {
  width: 100%;
  max-width: 480px;
}
.leitner-study-progress {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
}
.leitner-card-container {
  perspective: 1500px;
  margin-bottom: 32px;
}
.leitner-card {
  width: 100%;
  height: 480px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
  cursor: pointer;
}
.leitner-card.flipped {
  transform: rotateY(180deg);
}
.leitner-card-face {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px;
  text-align: center;
  border-radius: 28px;
  background: var(--nav-active-bg);
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
}
.leitner-card-back {
  transform: rotateY(180deg);
}
.leitner-card-label {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 20px;
}
.leitner-card-content {
  font-size: 24px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-primary);
}
.leitner-card-action-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 20px;
}
.leitner-btn {
  padding: 14px 32px;
  border-radius: 100px;
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
}
.leitner-btn-wrong {
  background: #ff3b30;
  color: white;
}
.leitner-btn-correct {
  background: #34c759;
  color: white;
}
.leitner-btn:hover {
  transform: scale(1.05);
  opacity: 0.9;
}
.leitner-hint {
  text-align: center;
  color: var(--text-faded);
  font-size: 13px;
}
.leitner-action-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-hover);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.2s ease;
}
.leitner-action-btn:hover {
  background: var(--nav-active-bg);
  transform: scale(1.05);
}
@media (max-width: 850px) {
  .eisenhower-matrix {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
  }
}
.flashcards-interface {
  display: flex;
  height: 100%;
  width: 100%;
  justify-content: center;
  align-items: center;
  padding-bottom: 40px;
}
.flashcards-content {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
}
.flashcards-container {
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.flashcards-progress {
  text-align: center;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: -0.01em;
  margin-bottom: 20px;
}
.flashcards-card-container {
  perspective: 2000px;
  margin-bottom: 32px;
  width: 100%;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}
.flashcards-card-container.editing {
  transform: scale(1.15);
  z-index: 100;
  position: relative;
}
.flashcards-card {
  width: 100%;
  height: 480px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1), height 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
}
.flashcards-card.flipped {
  transform: rotateY(180deg);
}
.flashcards-card-face {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 40px;
  text-align: center;
  border-radius: 28px;
  background: var(--nav-active-bg);
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 40px rgba(0, 0, 0, 0.2);
  transition: box-shadow 0.3s ease;
}
.flashcards-card-actions {
  position: absolute;
  top: 16px;
  right: 16px;
  display: flex;
  gap: 8px;
  z-index: 10;
}
.flashcards-card-action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(8px);
  cursor: pointer;
  transition: all 0.2s ease;
  color: var(--text-primary);
}
.flashcards-card-action-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.05);
}
.flashcards-card-label {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 24px;
  color: var(--text-faded);
}
.flashcards-card-content {
  font-size: 28px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}
.flashcards-card-back {
  transform: rotateY(180deg);
}
.flashcards-controls {
  display: flex;
  gap: 16px;
  justify-content: center;
  align-items: center;
}
.flashcards-center-button {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 140px;
}
.flashcards-btn {
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  border: none;
  border-radius: 980px;
  cursor: pointer;
  transition: all 0.2s ease;
}
.flashcards-btn-nav {
  background: var(--input-bg);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
}
.flashcards-btn-nav:hover:not(:disabled) {
  background: var(--bg-active);
  transform: translateY(-1px);
}
.flashcards-btn-nav:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}
.flashcards-btn-flip {
  background: var(--accent);
  color: #000;
  padding: 12px 32px;
}
.flashcards-btn-flip:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}
.flashcards-rating-buttons {
  display: flex;
  gap: 12px;
}
.flashcards-btn-correct {
  background: #34c759;
  color: #fff;
  width: 44px;
  height: 44px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.flashcards-btn-incorrect {
  background: #ff3b30;
  color: #fff;
  width: 44px;
  height: 44px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.flashcards-btn-correct:hover,
.flashcards-btn-incorrect:hover {
  transform: scale(1.1);
}
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  animation: fadeIn 0.2s ease-out;
}
.modal-content.create-modal {
  background: var(--main-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  width: 90%;
  max-width: 500px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
  animation: modalSlideUp 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  overflow: hidden;
}
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
@keyframes modalSlideUp {
  from {
    transform: translateY(20px) scale(0.95);
    opacity: 0;
  }
  to {
    transform: translateY(0) scale(1);
    opacity: 1;
  }
}
.modal-body {
  padding: 24px;
}
.modal-title h3 {
  margin: 0 0 20px 0;
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
}
.flashcards-form-group {
  margin-bottom: 20px;
}
.flashcards-form-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.flashcards-form-input {
  width: 100%;
  background: var(--input-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 12px 16px;
  color: var(--text-primary);
  font-size: 15px;
  outline: none;
  transition: all 0.2s ease;
  resize: vertical;
}
select.flashcards-form-input {
  padding-right: 40px !important;
  cursor: pointer;
}
.flashcards-form-input option {
  background-color: var(--main-bg);
  color: var(--text-primary);
}
.flashcards-form-input:focus {
  border-color: var(--accent);
  background: var(--bg-hover);
}
.modal-actions {
  display: flex;
  gap: 12px;
  margin-top: 24px;
  padding-top: 20px;
}
.modal-actions .btn {
  flex: 1;
  padding: 12px;
  border-radius: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}
.btn-cancel {
  background: var(--bg-hover);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}
.btn-create {
  background: var(--accent);
  color: #000;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.btn-create:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}
.flashcards-action-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--surface-card);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  padding: 0;
}
.flashcards-action-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}
.flashcards-action-btn svg {
  color: #000;
}
.flashcards-action-btn img {
  width: 24px;
  height: 24px;
  border-radius: 50%;
}
.kanban-board {
  display: grid;
  grid-template-columns: repeat(3, minmax(280px, 1fr));
  gap: 20px;
  width: 100%;
  height: 100%;
  padding: 10px;
  overflow-x: auto;
}
.kanban-column {
  background: var(--nav-active-bg);
  border-radius: 16px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
  min-width: 250px;
  min-height: 200px;
}
.kanban-column.drag-over {
  background: rgba(var(--accent-rgb), 0.1);
  border-color: var(--accent);
  transform: scale(1.02);
}
.kanban-column-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}
.kanban-column-header h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}
.kanban-task-count {
  font-size: 12px;
  color: var(--text-secondary);
  background: var(--input-bg);
  padding: 2px 8px;
  border-radius: 10px;
}
.kanban-task-list {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 50px;
}
.kanban-task-card {
  background: var(--surface-card);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 12px;
  cursor: grab;
  transition: all 0.2s ease;
  position: relative;
  user-select: none;
  border-left: 4px solid var(--accent);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}
.kanban-column[data-status='todo'] .kanban-task-card {
  border-left-color: #ffcc00;
  background: rgba(255, 204, 0, 0.08);
}
.kanban-column[data-status='doing'] .kanban-task-card {
  border-left-color: #3b82f6;
  background: rgba(59, 130, 246, 0.08);
}
.kanban-column[data-status='done'] .kanban-task-card {
  border-left-color: #10b981;
  background: rgba(16, 185, 129, 0.08);
}
.kanban-task-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}
.kanban-task-card.dragging {
  opacity: 0.5;
  cursor: grabbing;
}
.kanban-task-card-title {
  font-size: 14px;
  color: var(--text-primary);
  margin-top: 4px;
  padding-right: 30px;
  word-break: break-word;
}
.kanban-task-card-actions {
  position: absolute;
  top: 8px;
  right: 8px;
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity 0.2s ease;
  z-index: 2;
}
.kanban-task-card:hover .kanban-task-card-actions {
  opacity: 1;
}
.kanban-task-action-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}
.kanban-task-action-btn:hover {
  background: var(--nav-active-bg);
  color: #ef4444;
}
.kanban-add-task {
  margin-top: auto;
}
.kanban-add-input {
  width: 100%;
  background: var(--bg-hover);
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 8px 12px;
  color: var(--text-primary);
  font-size: 13px;
  outline: none;
  transition: all 0.2s ease;
}
.kanban-add-input:focus {
  background: var(--input-bg);
  border-color: var(--accent);
}
@media (max-width: 850px) {
  .kanban-board {
    grid-template-columns: 1fr;
    overflow-y: auto;
  }
}
.cornell-notes-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  width: 100%;
}
.cornell-note-card {
  border-radius: 16px;
  padding: 20px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.cornell-note-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}
.cornell-note-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.cornell-note-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}
.cornell-note-actions {
  display: flex;
  gap: 8px;
}
.cornell-note-action-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 6px;
  border-radius: 8px;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}
.cornell-note-action-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}
.cornell-note-delete-btn:hover {
  color: #ef4444;
}
.cornell-note-preview {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.cornell-note-footer {
  margin-top: auto;
  padding-top: 12px;
}
.cornell-editor {
  display: flex;
  flex-direction: column;
  background: var(--main-bg);
  padding: 2rem;
  position: relative;
  box-sizing: border-box;
  border-radius: 4px;
  width: 100%;
  margin: 0 auto;
}
.cornell-title-section {
  border-bottom: 3px solid #333;
  padding-bottom: 1rem;
  margin-bottom: 1.5rem;
}
.cornell-title-input {
  width: 100%;
  border: none;
  outline: none;
  font-size: 1.8rem;
  font-weight: bold;
  padding: 0.5rem 0;
  text-align: center;
  font-family: inherit;
  background: transparent;
  color: var(--text-primary);
}
.cornell-date-info {
  display: flex;
  justify-content: flex-end;
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-faded);
}
.cornell-date-info input {
  border: none;
  outline: none;
  background: transparent;
  font-family: inherit;
  color: var(--text-faded);
  text-align: right;
  width: auto;
}
.cornell-curriculum-toggle {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  background: var(--surface-card);
  padding: 12px;
  border-radius: 10px;
  border: 1px solid #444;
}
.cornell-toggle-option {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 14px;
  color: #ccc;
  transition: all 0.2s;
}
.cornell-toggle-option:hover {
  color: #fff;
}
.cornell-curriculum-selectors {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
  padding: 16px;
  background: rgba(var(--accent-rgb), 0.05);
  border-radius: 10px;
  border: 1px dashed var(--accent);
}
.cornell-selector-group {
  flex: 1;
  min-width: 150px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.cornell-selector-group label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-faded);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.cornell-select {
  width: 100%;
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--input-bg);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
}
.cornell-content-wrapper {
  display: flex;
  gap: 0;
  min-height: 400px;
  max-height: 600px;
  border-bottom: 3px solid #333;
  margin-bottom: 1.5rem;
  position: relative;
  overflow: hidden;
  background: var(--surface-card);
}
.cornell-keynotes {
  width: 25%;
  padding: 0.25rem 1rem 1rem 0.5rem;
  border-right: 2px solid var(--border-color);
  background: linear-gradient(transparent 1.4rem,
      rgba(var(--accent-rgb), 0.1) 1.4rem,
      rgba(var(--accent-rgb), 0.1) 1.5rem,
      transparent 1.5rem);
  background-size: 100% 1.5rem;
  line-height: 1.5rem;
  font-size: 0.95rem;
  color: var(--text-primary);
  outline: none;
  overflow-y: auto;
}
.cornell-notes {
  width: 75%;
  padding: 0.25rem 0.5rem 1rem 1rem;
  background: linear-gradient(transparent 1.4rem,
      var(--border-color) 1.4rem,
      var(--border-color) 1.5rem,
      transparent 1.5rem);
  background-size: 100% 1.5rem;
  line-height: 1.5rem;
  font-size: 1rem;
  color: var(--text-primary);
  outline: none;
  overflow-y: auto;
}
.cornell-summary-section {
  margin-top: 1.5rem;
}
.cornell-summary-label {
  font-weight: bold;
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}
.cornell-summary {
  width: 100%;
  min-height: 120px;
  padding: 0.25rem 0.5rem 1rem;
  background: linear-gradient(transparent 1.4rem,
      var(--border-color) 1.4rem,
      var(--border-color) 1.5rem,
      transparent 1.5rem);
  background-size: 100% 1.5rem;
  line-height: 1.5rem;
  font-size: 1rem;
  color: var(--text-primary);
  outline: none;
  border: none;
  border-radius: 0;
}
.cornell-editor-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 20px 0;
  margin-top: 20px;
  border-top: 1px solid var(--border-color);
}
.cornell-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
}
.cornell-btn-secondary {
  background: var(--surface-card) !important;
  color: #1d1d1f !important;
  border: 1px solid var(--border-color) !important;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}
.cornell-btn-primary {
  background: var(--accent) !important;
  color: white !important;
  border: none;
}
.cornell-editor .flashcards-action-btn {
  width: 56px;
  height: 56px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: var(--surface-card);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}
.mindmap-interface {
  display: flex;
  flex-direction: column;
  height: 100%;
  flex: 1;
}
.mindmap-viz-container {
  height: 100%;
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}
.mindmap-viz-header {
  padding: 32px 32px 0;
  z-index: 10;
  pointer-events: none;
}
.mindmap-viz-title {
  font-size: 22px;
  font-weight: 400;
  margin-bottom: 4px;
  color: #e3e3e3;
}
.mindmap-viz-desc {
  color: #c4c7c5;
  font-size: 14px;
  opacity: 0.7;
}
.mindmap-viewport {
  flex: 1;
  cursor: grab;
  touch-action: none;
}
.mindmap-node-rect {
  fill: transparent;
  stroke: rgba(255, 255, 255, 0.1);
  stroke-width: 1px;
  rx: 25;
  ry: 25;
  transition: all 0.2s ease;
}
.mindmap-node-group:hover .mindmap-node-rect {
  stroke: rgba(138, 180, 248, 0.4);
  fill: rgba(255, 255, 255, 0.1);
}
.mindmap-node-text {
  fill: #e3e3e3;
  font-size: 13px;
  font-weight: 400;
  pointer-events: none;
  user-select: none;
}
.mindmap-link {
  fill: none;
  stroke: #8ab4f8;
  stroke-opacity: 0.2;
  stroke-width: 1.2px;
  transition: stroke-opacity 0.3s ease;
}
.mindmap-node-group:hover+.mindmap-link,
.mindmap-link:hover {
  stroke-opacity: 0.5;
  stroke-width: 1.5px;
}
.mindmap-node-toggle circle {
  fill: rgba(255, 255, 255, 0.05);
  stroke: rgba(255, 255, 255, 0.15);
  stroke-width: 1px;
}
.mindmap-node-group:hover .mindmap-node-toggle circle {
  stroke: #8ab4f8;
}
.mindmap-toggle-icon {
  fill: #c4c7c5;
  font-size: 10px;
  font-weight: 400;
  pointer-events: none;
}
.mindmap-controls {
  position: absolute;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.mindmap-control-btn {
  width: 36px;
  height: 36px;
  background: var(--section-highlight);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  color: #c4c7c5;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
}
.mindmap-control-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #e3e3e3;
}
@media (max-width: 768px) {
  .cornell-content-wrapper {
    flex-direction: column;
    max-height: none;
  }
  .cornell-keynotes,
  .cornell-notes {
    width: 100%;
    border-right: none;
    border-bottom: 2px solid #999;
  }
}
.mindmap-container {
  padding: 24px;
  height: 100%;
  overflow-y: auto;
}
.mindmap-header-bar {
  position: absolute;
  top: 16px;
  left: 16px;
  right: 16px;
  display: flex;
  align-items: center;
  gap: 16px;
  z-index: 10;
}
.mindmap-back-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--nav-active-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}
.mindmap-back-btn:hover {
  background: var(--bg-active);
  border-color: var(--accent);
}
.mindmap-active-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}
.mindmap-header {
  margin-bottom: 24px;
}
.mindmap-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
}
.mindmap-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}
.mindmap-card {
  background: var(--nav-active-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 18px;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  max-width: 600px;
}
.mindmap-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  background: var(--bg-active);
}
.mindmap-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 12px;
}
.mindmap-card-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 80%;
}
.mindmap-card-description {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.mindmap-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-color);
  padding-top: 12px;
  margin-top: auto;
}
.mindmap-card-date {
  font-size: 11px;
  color: var(--text-faded);
}
.mindmap-card-actions {
  display: flex;
  gap: 8px;
  opacity: 0;
  transition: opacity 0.2s ease;
}
.mindmap-card:hover .mindmap-card-actions {
  opacity: 1;
}
.mindmap-action-btn {
  background: none;
  border: none;
  color: var(--text-faded);
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}
.mindmap-action-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}
.graph-tool-container {
  background: var(--surface-card);
  color: var(--text-secondary);
  font-family: 'Segoe UI',
    -apple-system,
    BlinkMacSystemFont,
    Roboto,
    sans-serif;
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
}
.graph-tool-container canvas {
  display: block;
  cursor: crosshair;
  touch-action: none;
  user-select: none;
  width: 100%;
  height: 100%;
}
.graph-tool-container #control-panel {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px;
  width: 260px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  z-index: 3000;
}
.graph-tool-container #control-panel h3 {
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 10px;
}
.graph-tool-container .input-row {
  display: flex;
  gap: 6px;
  margin-bottom: 10px;
}
.graph-tool-container #function-input {
  flex: 1;
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 8px 10px;
  color: var(--text-secondary);
  font-size: 13px;
  font-family: monospace;
  outline: none;
}
.graph-tool-container #function-input:focus {
  border-color: var(--accent);
}
.graph-tool-container #function-input::placeholder {
  color: var(--text-tertiary);
}
.graph-tool-container .btn {
  background: var(--accent);
  border: none;
  border-radius: 4px;
  padding: 8px 14px;
  color: #fff;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
}
.graph-tool-container .btn:hover {
  background: var(--accent-hover);
}
.graph-tool-container .btn-secondary {
  background: var(--tool-bg);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}
.graph-tool-container .btn-secondary:hover {
  background: #eee;
}
.graph-tool-container #functions-list {
  max-height: 180px;
  overflow-y: auto;
  margin-bottom: 10px;
}
.graph-tool-container .function-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  margin-bottom: 4px;
}
.graph-tool-container .function-item:hover {
  background: #f0f0f0;
}
.graph-tool-container .function-color {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  flex-shrink: 0;
}
.graph-tool-container .function-expr {
  flex: 1;
  color: var(--text-secondary);
  font-size: 12px;
  font-family: monospace;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.graph-tool-container .function-toggle {
  width: 16px;
  height: 16px;
  background: var(--surface-card);
  border: 1.5px solid #ccc;
  border-radius: 3px;
  cursor: pointer;
}
.graph-tool-container .function-toggle.active {
  background: var(--accent);
  border-color: var(--accent);
  position: relative;
}
.graph-tool-container .function-toggle.active::after {
  content: '✓';
  color: #fff;
  font-size: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.graph-tool-container .function-remove {
  width: 18px;
  height: 18px;
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  font-size: 14px;
  border-radius: 3px;
}
.graph-tool-container .function-remove:hover {
  color: #e53e3e;
  background: #fee;
}
.graph-tool-container .actions-row {
  display: flex;
  gap: 8px;
}
.graph-tool-container .actions-row .btn {
  flex: 1;
}
.graph-tool-container #coord-display {
  position: absolute;
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 4px 8px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s;
  z-index: 50;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
}
.graph-tool-container #coord-display.visible {
  opacity: 1;
}
.graph-tool-container #coord-display .coords {
  color: var(--text-secondary);
  font-size: 11px;
  font-family: monospace;
}
.graph-tool-container #coord-display .fn-label {
  color: var(--accent);
  font-size: 10px;
  margin-top: 2px;
}
.graph-tool-container #hint {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 6px 12px;
  color: var(--text-faded);
  font-size: 11px;
  pointer-events: none;
  z-index: 50;
}
.graph-tool-container #ai-button {
  position: absolute;
  bottom: 20px;
  right: 20px;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  cursor: pointer;
  z-index: 200;
  overflow: hidden;
  transition: transform 0.2s,
    box-shadow 0.2s;
  padding: 0;
}
.graph-tool-container #ai-button:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}
.graph-tool-container #ai-button img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.graph-tool-container #chat-panel {
  position: absolute;
  bottom: 90px;
  right: 20px;
  width: 450px;
  max-height: 500px;
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  display: none;
  flex-direction: column;
  z-index: 150;
  overflow: hidden;
}
.graph-tool-container #chat-panel.open {
  display: flex;
}
.graph-tool-container #chat-header {
  padding: 12px 16px;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 10px;
}
.graph-tool-container #chat-header img {
  width: 28px;
  height: 28px;
  border-radius: 50%;
}
.graph-tool-container #chat-header span {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
}
.graph-tool-container #chat-close {
  margin-left: auto;
  background: none;
  border: none;
  font-size: 18px;
  color: var(--text-faded);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
}
.graph-tool-container #chat-close:hover {
  background: #eee;
}
.graph-tool-container #chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  max-height: 350px;
  min-height: 150px;
}
.graph-tool-container .chat-msg {
  margin-bottom: 12px;
  max-width: 90%;
  display: flex;
}
.graph-tool-container .chat-msg.user {
  margin-left: auto;
  justify-content: flex-end;
}
.graph-tool-container .chat-msg .bubble {
  display: inline-block;
  padding: 10px 14px;
  border-radius: 12px;
  font-size: 14px;
  line-height: 1.6;
  text-align: left;
}
.graph-tool-container .chat-msg.user .bubble {
  background: var(--accent);
  color: #fff;
  border-bottom-right-radius: 4px;
}
.graph-tool-container .chat-msg.ai .bubble {
  background: var(--tool-bg);
  color: var(--text-secondary);
  border-bottom-left-radius: 4px;
}
.graph-tool-container .chat-msg.ai .bubble.typing {
  color: var(--text-tertiary);
}
.graph-tool-container #chat-input-row {
  padding: 12px;
  border-top: 1px solid var(--border-color);
  display: flex;
  gap: 8px;
}
.graph-tool-container #chat-input {
  flex: 1;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 8px 14px;
  font-size: 13px;
  outline: none;
  background: var(--surface-card);
  color: var(--text-secondary);
}
.graph-tool-container #chat-input:focus {
  border-color: var(--accent);
}
.graph-tool-container #chat-send {
  background: var(--accent);
  border: none;
  border-radius: 50%;
  width: 36px;
  height: 36px;
  color: #fff;
  cursor: pointer;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.graph-tool-container #chat-send:hover {
  background: var(--accent-hover);
}
.graph-tool-container #drawing-toolbar {
  position: absolute;
  top: 50%;
  right: 20px;
  transform: translateY(-50%);
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  z-index: 3000;
}
.graph-tool-container .tool-btn {
  width: 36px;
  height: 36px;
  background: var(--surface-card);
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-faded);
  transition: all 0.15s ease;
  padding: 0;
}
.graph-tool-container .tool-btn:hover {
  background: var(--tool-bg);
  color: var(--text-secondary);
}
.graph-tool-container .tool-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent-hover);
}
.graph-tool-container .tool-btn.active:hover {
  background: var(--accent-hover);
}
.graph-tool-container .tool-btn svg {
  width: 18px;
  height: 18px;
}
.graph-tool-container .tool-separator {
  height: 1px;
  background: #e0e0e0;
  margin: 4px 0;
}
.graph-tool-container #coords-table th,
.graph-tool-container #coords-table td {
  border: 1px solid #f0f0f0;
}
.graph-tool-container #coords-table thead th {
  background: #f9fafb;
}
@media (max-width: 768px) {
  .graph-tool-container #drawing-toolbar {
    top: auto;
    bottom: 80px;
    right: 10px;
    transform: none;
    flex-direction: row;
    padding: 4px;
  }
  .graph-tool-container .tool-btn {
    width: 32px;
    height: 32px;
  }
  .graph-tool-container .tool-separator {
    width: 1px;
    height: auto;
    margin: 0 4px;
  }
}
.graph-tool-container {
  background: var(--surface-card);
  color: var(--text-secondary);
  font-family: 'Segoe UI',
    -apple-system,
    BlinkMacSystemFont,
    Roboto,
    sans-serif;
  position: relative;
  width: 100%;
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
#graphCanvas {
  cursor: crosshair;
  display: block;
  width: 100%;
  height: 100%;
  flex: 1;
}
.graph-tool-container #control-panel {
  position: absolute;
  top: 15px;
  left: 15px;
  width: 260px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 14px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
  z-index: 3000;
  transition: all 0.3s ease;
}
.graph-tool-container h3 {
  margin: 0 0 10px 0;
  font-size: 14px;
  font-weight: 600;
  color: #1a1a1a;
  display: flex;
  align-items: center;
  gap: 6px;
}
.graph-tool-container .input-row {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}
.graph-tool-container #function-input {
  flex: 1;
  padding: 8px 10px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-family: 'Consolas', 'Monaco', monospace;
  font-size: 13px;
  transition: border-color 0.2s;
}
.graph-tool-container #function-input:focus {
  border-color: var(--accent);
  outline: none;
}
.graph-tool-container .btn {
  padding: 8px 14px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  transition: all 0.2s;
}
.graph-tool-container #add-btn {
  background: var(--accent);
  color: #fff;
}
.graph-tool-container #add-btn:hover {
  background: var(--accent-hover);
}
.graph-tool-container .btn-secondary {
  background: var(--main-bg);
  color: #4b5563;
  flex: 1;
}
.graph-tool-container .btn-secondary:hover {
  background: #e5e7eb;
}
.graph-tool-container .actions-row {
  display: flex;
  gap: 8px;
  margin-top: 10px;
}
.graph-tool-container #functions-list {
  max-height: 180px;
  overflow-y: auto;
  margin-bottom: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.graph-tool-container .function-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  background: #f9fafb;
  border-radius: 6px;
  border: 1px solid #f0f0f0;
}
.graph-tool-container .function-color {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.graph-tool-container .function-expr {
  flex: 1;
  font-family: 'Consolas', monospace;
  font-size: 12px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.graph-tool-container .function-toggle {
  width: 14px;
  height: 14px;
  border: 2px solid var(--border-color);
  border-radius: 3px;
  cursor: pointer;
  position: relative;
}
.graph-tool-container .function-toggle.active {
  background: var(--accent);
  border-color: var(--accent);
}
.graph-tool-container .function-toggle.active::after {
  content: '✓';
  color: white;
  font-size: 10px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.graph-tool-container .function-remove {
  background: none;
  border: none;
  color: #9ca3af;
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
  padding: 0 2px;
}
.graph-tool-container .function-remove:hover {
  color: #ef4444;
}
.graph-tool-container #coord-display {
  position: absolute;
  background: rgba(26, 26, 26, 0.9) !important;
  color: #ffffff !important;
  padding: 6px 12px;
  border-radius: 8px;
  font-family: 'Consolas', 'Monaco', monospace;
  font-size: 13px;
  pointer-events: none;
  z-index: 2000;
  display: none;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}
.graph-tool-container #coord-display .coords {
  color: #ffffff !important;
}
.graph-tool-container #coord-display.visible {
  display: block;
}
.graph-tool-container #coord-display .fn-label {
  font-size: 11px;
  margin-top: 2px;
  opacity: 0.9;
}
.graph-tool-container #hint {
  position: absolute;
  bottom: 15px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(4px);
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 11px;
  color: var(--text-faded);
  border: 1px solid rgba(0, 0, 0, 0.05);
  pointer-events: none;
}
.graph-tool-container #ai-button {
  position: absolute;
  bottom: 15px;
  right: 15px;
  width: 50px;
  height: 50px;
  border-radius: 25px;
  background: var(--surface-card);
  border: none;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  cursor: pointer;
  overflow: hidden;
  padding: 0;
  transition: transform 0.2s;
  z-index: 1000;
}
.graph-tool-container #ai-button:hover {
  transform: scale(1.05);
}
.graph-tool-container #ai-button img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.graph-tool-container #chat-panel {
  position: absolute;
  bottom: 75px;
  right: 15px;
  width: 300px;
  height: 400px;
  background: var(--surface-card);
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: translateY(20px);
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 999;
}
.graph-tool-container #chat-panel.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: all;
}
.graph-tool-container #chat-header {
  padding: 10px 14px;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 600;
}
.graph-tool-container #chat-header img {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--surface-card);
}
.graph-tool-container #chat-close {
  margin-left: auto;
  background: none;
  border: none;
  color: #fff;
  font-size: 20px;
  cursor: pointer;
  opacity: 0.8;
}
.graph-tool-container #chat-close:hover {
  opacity: 1;
}
.graph-tool-container #chat-messages {
  flex: 1;
  padding: 14px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: #f9fafb;
}
.graph-tool-container .chat-msg {
  display: flex;
}
.graph-tool-container .chat-msg.user {
  justify-content: flex-end;
}
.graph-tool-container .bubble {
  max-width: 85%;
  padding: 8px 12px;
  border-radius: 12px;
  font-size: 13px;
  line-height: 1.4;
}
.graph-tool-container .chat-msg.ai .bubble {
  background: var(--surface-card);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  border-bottom-left-radius: 2px;
}
.graph-tool-container .chat-msg.user .bubble {
  background: var(--accent);
  color: #fff;
  border-bottom-right-radius: 2px;
}
.graph-tool-container .bubble.typing {
  color: #9ca3af;
  font-style: italic;
}
.graph-tool-container #chat-input-row {
  padding: 10px;
  background: var(--surface-card);
  border-top: 1px solid var(--border-color);
  display: flex;
  gap: 8px;
}
.graph-tool-container #chat-input {
  flex: 1;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 13px;
}
.graph-tool-container #chat-input:focus {
  outline: none;
  border-color: var(--accent);
}
.graph-tool-container #chat-send {
  background: var(--accent);
  color: #fff;
  border: none;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}
.graph-tool-container #chat-send:hover {
  background: var(--accent-hover);
}
.graph-tool-container #drawing-toolbar {
  position: absolute;
  top: 50%;
  right: 20px;
  transform: translateY(-50%);
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  z-index: 3000;
}
.graph-tool-container .tool-btn {
  width: 36px;
  height: 36px;
  background: var(--surface-card);
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-faded);
  transition: all 0.15s ease;
  padding: 0;
}
.graph-tool-container .tool-btn:hover {
  background: var(--tool-bg);
  color: var(--text-secondary);
}
.graph-tool-container .tool-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent-hover);
}
.graph-tool-container .tool-btn.active:hover {
  background: var(--accent-hover);
}
.graph-tool-container .tool-btn svg {
  width: 18px;
  height: 18px;
}
.graph-tool-container .tool-separator {
  height: 1px;
  background: #e0e0e0;
  margin: 4px 0;
}
.graph-tool-container #coords-table th,
.graph-tool-container #coords-table td {
  border: 1px solid #f0f0f0;
}
.graph-tool-container #coords-table thead th {
  background: #f9fafb;
}
@media (max-width: 768px) {
  .graph-tool-container #drawing-toolbar {
    top: auto;
    bottom: 80px;
    right: 10px;
    transform: none;
    flex-direction: row;
    padding: 4px;
  }
  .graph-tool-container .tool-btn {
    width: 32px;
    height: 32px;
  }
  .graph-tool-container .tool-separator {
    width: 1px;
    height: auto;
    margin: 0 4px;
  }
}
.mindmap-toggle-circle {
  transition: transform 0.2s ease,
    fill 0.2s ease;
}
.mindmap-node-group:hover .mindmap-toggle-circle {
  transform: scale(1.1);
}
.mindmap-node-group.collapsed .mindmap-node-rect {
  stroke-dasharray: 5, 5;
  opacity: 0.8;
}
.mindmap-node-group.collapsed .mindmap-toggle-circle {
  fill: var(--text-secondary);
}
.mindmap-node-group {
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.mindmap-node-rect {
  transition: all 0.3s ease;
}
.mindmap-connection {
  transition: d 0.4s cubic-bezier(0.4, 0, 0.2, 1),
    opacity 0.3s ease;
}
.mindmap-viz-container {
  animation: mindmapEnter 0.5s ease-out;
}
@keyframes mindmapEnter {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}
.mindmap-viewport {
  transition: cursor 0.2s ease;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}
.mindmap-viewport svg {
  touch-action: none;
}
.custom-scrollbar::-webkit-scrollbar {
  width: 5px;
}
.custom-scrollbar::-webkit-scrollbar-track {
  background: transparent;
}
.custom-scrollbar::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.1);
  border-radius: 10px;
}
.custom-scrollbar::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 0, 0, 0.2);
}
@keyframes drawPulse {
  0% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.05);
    opacity: 0.8;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}
.ai-thinking-dots {
  display: flex;
  gap: 4px;
}
.ai-thinking-dot {
  width: 4px;
  height: 4px;
  background: currentColor;
  border-radius: 50%;
  animation: drawPulse 1s infinite ease-in-out;
}
.podcast-container {
  padding: 32px 40px;
  height: 100%;
  overflow-y: auto;
  background: transparent;
  color: var(--text-primary);
  font-family: inherit;
}
.podcast-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}
.podcast-header h2 {
  font-size: 24px;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}
.podcast-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.podcast-card {
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 160px;
  cursor: pointer;
  transition: transform 0.2s ease,
    border-color 0.2s ease,
    box-shadow 0.2s ease;
  position: relative;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}
.podcast-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}
.podcast-card-title {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 8px 0;
  line-height: 1.4;
  color: var(--text-primary);
}
.podcast-card-description {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.podcast-card-footer {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.podcast-card-date {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.mindmap-action-btn {
  background: transparent;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: 6px;
  border-radius: 4px;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.mindmap-action-btn:hover {
  background: var(--bg-tertiary);
  color: #ef4444;
}
.podcast-audio-player-container {
  margin: 0 auto;
  padding: 20px;
  animation: fadeIn 0.3s ease-out;
}
.podcast-audio-header {
  display: flex;
  gap: 24px;
  margin-bottom: 32px;
  align-items: center;
}
.podcast-audio-artwork {
  width: 120px;
  height: 120px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  flex-shrink: 0;
}
.podcast-audio-info {
  flex: 1;
}
.podcast-audio-title {
  font-size: 24px;
  font-weight: 700;
  margin: 0 0 8px 0;
  line-height: 1.2;
  color: var(--text-primary);
}
.podcast-audio-hosts {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}
.podcast-audio-desc {
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-secondary);
}
.podcast-audio-controls {
  padding: 24px;
  border-radius: 16px;
  margin-bottom: 32px;
}
audio {
  width: 100%;
  height: 40px;
  border-radius: 8px;
  outline: none;
}
.podcast-script-toggle {
  text-align: center;
  margin-bottom: 24px;
}
.podcast-script-toggle button {
  background: transparent;
  border: 1px solid var(--border-color);
  padding: 8px 20px;
  border-radius: 20px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
  font-size: 13px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.podcast-script-toggle button:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--text-secondary);
  cursor: pointer;
}
.podcast-script-panel {
  background: transparent;
  border: none;
  padding: 0;
}
.podcast-transcript {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-bottom: 40px;
}
.podcast-turn {
  display: flex;
  flex-direction: column;
  gap: 4px;
  animation: slideUp 0.3s ease-out;
}
.podcast-turn.speaker-sam {
  align-self: flex-start;
}
.podcast-turn.speaker-alex {
  align-self: flex-end;
  align-items: flex-end;
}
.podcast-speaker-name {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-tertiary);
  margin-left: 12px;
  margin-right: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.podcast-bubble {
  padding: 12px 16px;
  font-size: 15px;
  line-height: 1.5;
  border-radius: 18px;
  position: relative;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}
.podcast-turn.speaker-sam .podcast-bubble {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-bottom-left-radius: 4px;
  border: 1px solid transparent;
}
.podcast-turn.speaker-alex .podcast-bubble {
  background: var(--accent);
  color: #000000;
  border-bottom-right-radius: 4px;
}
.podcast-header-back-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  margin-right: 12px;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: var(--font-size-conversation);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.podcast-header-back-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--text-secondary);
}
.podcast-empty-cta {
  margin-top: 16px;
}
.podcast-loading-spinner {
  opacity: 0.4;
  color: var(--text-tertiary);
}
.podcast-gen-modal {
  max-width: 480px;
}
.podcast-gen-modal-body {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.podcast-gen-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}
.podcast-gen-label {
  font-size: var(--font-size-conversation);
  font-weight: 600;
  color: var(--text-secondary);
}
.podcast-gen-input,
.podcast-gen-select {
  width: 100%;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--input-bg);
  color: var(--text-primary);
  font-size: var(--font-size-conversation);
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
  box-sizing: border-box;
  appearance: none;
  -webkit-appearance: none;
}
.podcast-gen-input:focus,
.podcast-gen-select:focus {
  border-color: var(--accent);
}
.podcast-gen-input:disabled,
.podcast-gen-select:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.podcast-gen-input::placeholder {
  color: var(--text-tertiary);
}
.podcast-gen-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23999' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
  cursor: pointer;
}
.podcast-gen-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--font-size-conversation);
  color: var(--accent);
  margin-bottom: 16px;
  min-height: 20px;
}
.podcast-gen-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 4px;
}
.podcast-gen-cancel-btn {
  padding: 8px 18px;
  border-radius: 20px;
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-secondary);
  font-size: var(--font-size-conversation);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.podcast-gen-cancel-btn:hover:not(:disabled) {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}
.podcast-gen-cancel-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.cornell-action-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
@media (max-width: 600px) {
  .podcast-audio-header {
    flex-direction: column;
    text-align: center;
    gap: 16px;
  }
  .podcast-container {
    padding: 16px;
  }
  .podcast-audio-title {
    font-size: 20px;
  }
}
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.app-header {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: transparent;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(16px);
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
  flex-shrink: 0;
}
.header-left {
  flex: 1;
}
.header-center {
  flex: 2;
  display: flex;
  justify-content: center;
}
.header-right {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 16px;
}
.header-search {
  width: 100%;
  max-width: 480px;
  position: relative;
  display: flex;
  align-items: center;
}
.search-icon {
  position: absolute;
  left: 12px;
  color: var(--text-faded);
  pointer-events: none;
}
.header-search-input {
  width: 100%;
  background: var(--input-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 10px 12px 10px 40px;
  color: var(--text-primary);
  font-size: 14px;
  transition: all 0.2s;
}
.header-search-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
  background: var(--input-main-bg);
}
.search-shortcut {
  position: absolute;
  right: 12px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 11px;
  color: var(--text-faded);
  pointer-events: none;
}
.header-icon-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 8px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  position: relative;
}
.header-icon-btn:hover {
  background: var(--nav-active-bg);
  color: var(--text-primary);
}
.notification-badge {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 6px;
  height: 6px;
  background: #ff4b4b;
  border-radius: 50%;
  border: 1.5px solid var(--sidebar-bg);
}
.header-profile-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 2px;
  border-radius: 50%;
  transition: transform 0.2s;
}
.header-profile-btn:hover {
  transform: scale(1.05);
}
.header-profile-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--accent);
  color: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
}
.header-auth-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 18px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s ease;
  white-space: nowrap;
  border: none;
}
.header-login-btn {
  background: var(--text-primary);
  color: var(--bg-primary);
}
.header-login-btn:hover {
  opacity: 0.88;
}
.header-signup-btn {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}
.header-signup-btn:hover {
  background: var(--bg-tertiary);
  border-color: var(--text-faded);
}
.header-help-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1.5px solid var(--border-color);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
  flex-shrink: 0;
}
.header-help-btn:hover {
  border-color: var(--text-faded);
  color: var(--text-primary);
}
.sidebar-auth-buttons {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px 12px 8px;
}
.sidebar-login-btn,
.sidebar-signup-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 9px 0;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: opacity 0.15s ease, background 0.15s ease;
}
.sidebar-login-btn {
  background: var(--text-primary);
  color: var(--bg-primary);
}
.sidebar-login-btn:hover {
  opacity: 0.88;
}
.sidebar-signup-btn {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}
.sidebar-signup-btn:hover {
  background: var(--bg-tertiary);
  border-color: var(--text-faded);
}
.sidebar-login-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--text-primary);
  color: var(--bg-primary);
  cursor: pointer;
  text-decoration: none;
  transition: opacity 0.15s ease;
}
.sidebar-login-icon-btn:hover {
  opacity: 0.88;
}
.lm-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: lm-fade-in 0.25s ease-out;
}
.lm-popup {
  position: relative;
  width: 100%;
  max-width: 420px;
  background: var(--modal-card-bg);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 44px 32px 36px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.3);
  animation: lm-scale-up 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  color: var(--text-primary);
}
.lm-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 6px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease, color 0.15s ease;
}
.lm-close-btn:hover {
  background: rgba(var(--ink), 0.07);
  color: var(--text-primary);
}
.lm-title {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 10px;
  text-align: center;
  letter-spacing: -0.02em;
}
.lm-subtitle {
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--text-secondary);
  text-align: center;
  margin: 0 0 32px;
}
.lm-social-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
}
.lm-social-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 12px 16px;
  border-radius: 999px;
  background: rgba(var(--ink), 0.04);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}
.lm-social-btn:hover {
  background: rgba(var(--ink), 0.08);
  border-color: rgba(var(--ink), 0.2);
  transform: translateY(-1px);
}
.lm-social-btn:active {
  transform: translateY(0);
}
.lm-icon {
  flex-shrink: 0;
}
.lm-sep-row {
  display: flex;
  align-items: center;
  width: 100%;
  margin: 24px 0;
  gap: 16px;
}
.lm-sep-line {
  flex: 1;
  height: 1px;
  background: var(--border-color);
}
.lm-sep-text {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-tertiary);
  letter-spacing: 0.05em;
}
.lm-email-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
  width: 100%;
}
.lm-email-input {
  width: 100%;
  padding: 12px 20px;
  border-radius: 999px;
  background: var(--input-bg, var(--main-bg));
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  box-sizing: border-box;
}
.lm-email-input::placeholder {
  color: var(--text-tertiary);
}
.lm-email-input:focus {
  border-color: var(--text-primary);
  box-shadow: 0 0 0 1px var(--text-primary);
}
.lm-submit-btn {
  width: 100%;
  padding: 12px 20px;
  border-radius: 999px;
  background: var(--text-primary);
  border: none;
  color: var(--bg-primary);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s ease, transform 0.15s ease;
}
.lm-submit-btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}
.lm-submit-btn:active {
  transform: translateY(0);
}
.lm-info-banner {
  margin-top: 20px;
  padding: 10px 16px;
  border-radius: 12px;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.25);
  color: #ef4444;
  font-size: 0.85rem;
  line-height: 1.4;
  text-align: center;
  animation: lm-slide-in 0.2s ease-out;
}
.lm-account-card {
  display: flex;
  align-items: center;
  padding: 16px 20px;
  padding-right: 52px;
  border-radius: 20px;
  border: 2px solid var(--text-primary);
  background: transparent;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease;
  position: relative;
  gap: 16px;
  margin-bottom: 24px;
}
.lm-account-card:hover {
  background: rgba(var(--ink), 0.04);
}
.lm-account-card:active {
  transform: scale(0.99);
}
.lm-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #7c3aed;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  flex-shrink: 0;
}
.lm-account-details {
  display: flex;
  flex-direction: column;
  text-align: left;
  flex: 1;
}
.lm-account-name {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.2;
}
.lm-account-email {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-top: 3px;
  line-height: 1.2;
}
.lm-forget-btn {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 6px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease, color 0.15s ease;
  z-index: 2;
}
.lm-forget-btn:hover {
  background: rgba(var(--ink), 0.1);
  color: var(--text-primary);
}
.lm-switch-btns {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
}
.lm-switch-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 12px 16px;
  border-radius: 999px;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}
.lm-switch-btn:hover {
  background: rgba(var(--ink), 0.05);
  border-color: rgba(var(--ink), 0.2);
  transform: translateY(-1px);
}
.lm-switch-btn:active {
  transform: translateY(0);
}
@keyframes lm-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
@keyframes lm-scale-up {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}
@keyframes lm-slide-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.home-content {
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  animation: slideUp 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.greeting-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.greeting-text {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}
.greeting-subtext {
  font-size: 16px;
  color: var(--text-secondary);
  font-weight: 500;
}
.subject-selector {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.subject-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 18px;
  background: var(--section-highlight);
  border-radius: 12px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  color: var(--text-primary);
  user-select: none;
}
.subject-card:hover {
  transform: translateY(-2px);
}
.subject-card.active {
  background: var(--section-highlight);
  border-color: var(--subject-color);
  box-shadow: 0 0 15px rgba(var(--subject-color-rgb), 0.1);
}
.subject-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s;
}
.subject-card:hover .subject-icon {
  transform: scale(1.1);
}
.subject-label {
  font-size: 14px;
  font-weight: 600;
}
:root {
  --biology-rgb: 74, 222, 128;
  --chemistry-rgb: 248, 113, 113;
  --mathematics-rgb: 96, 165, 250;
  --physics-rgb: 167, 139, 250;
}
.huge-card {
  width: 100%;
  min-height: 320px;
  background-color: var(--input-bg);
  border-radius: 24px;
  padding: 48px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 64px;
  position: relative;
  overflow: hidden;
  margin-top: 8px;
}
.card-content {
  max-width: 500px;
  z-index: 2;
}
.card-title {
  font-size: 32px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: -1px;
}
.card-description {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 32px;
  opacity: 0.9;
}
.card-action-btn {
  padding: 14px 28px;
  background: var(--accent);
  color: #000;
  border-radius: 14px;
  font-weight: 700;
  font-size: 15px;
  border: none;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.card-action-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(255, 196, 0, 0.2);
}
.card-visual {
  flex: 1;
  display: flex;
  justify-content: flex-end;
  z-index: 1;
}
.visual-placeholder {
  width: 240px;
  height: 240px;
  background: var(--section-highlight);
  border-radius: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: rotate(12deg);
}
.selection-flow {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  width: 100%;
}
.selection-item-container {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}
.selection-step-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 4px;
}
.step-number {
  font-weight: 700;
  opacity: 0.8;
}
.selection-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  background: var(--section-highlight);
  border-radius: 14px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  min-width: 220px;
  border: 1px solid transparent;
}
.selection-box.active {
  background: var(--section-highlight);
  box-shadow: 0 0 0 2px var(--step-color);
}
[data-theme='dark'] .selection-box {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.1);
}
[data-theme='dark'] .selection-box.active {
  background: rgba(255, 255, 255, 0.06);
}
.selection-value {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}
.flow-arrow {
  align-self: flex-end;
  margin-bottom: 18px;
  color: var(--text-tertiary);
  opacity: 0.6;
}
.portal-dropdown {
  position: fixed;
  z-index: 9000;
  background: var(--section-highlight);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  min-width: 240px;
  max-height: 300px;
  overflow-y: auto;
  box-shadow: 0 16px 48px var(--drop-shadow), 0 0 0 0.5px rgba(255, 255, 255, 0.04) inset;
  animation: fadeInSlideUp 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  scrollbar-width: thin;
  scrollbar-color: var(--bg-tertiary) transparent;
}
[data-theme='dark'] .portal-dropdown {
  background: #202020;
  border-color: rgba(255, 255, 255, 0.14);
}
[data-theme='dark'][data-dark-variant='charcoal'] .portal-dropdown {
  background: #2e2e2e;
}
.portal-dropdown::-webkit-scrollbar {
  width: 4px;
}
.portal-dropdown::-webkit-scrollbar-track {
  background: transparent;
}
.portal-dropdown::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 4px;
}
.portal-dropdown-item {
  display: flex;
  align-items: center;
  width: 100%;
  text-align: left;
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  background: transparent;
  border: none;
  border-left: 2px solid transparent;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s, color 0.12s;
  gap: 10px;
  box-sizing: border-box;
}
.portal-dropdown-item:hover {
  background: var(--select-highlight);
  color: var(--text-primary);
}
.portal-dropdown-item.active {
  border-left-color: var(--step-color, var(--accent));
  color: var(--step-color, var(--accent));
  background: rgba(var(--step-color-rgb, var(--accent-rgb)), 0.06);
}
.portal-dropdown-item-number {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  min-width: 20px;
}
.portal-dropdown-empty {
  padding: 16px 14px;
  font-size: 13px;
  color: var(--text-tertiary);
  text-align: center;
}
.journey-tracker-section {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 40px;
  border: none;
}
.journey-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.journey-title {
  display: flex;
  align-items: center;
  gap: 16px;
}
.journey-title h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}
.journey-icon-badge {
  width: 40px;
  height: 40px;
  background: var(--section-highlight);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
}
.journey-overview-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  background: var(--section-highlight);
  border-radius: 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  border: none;
  cursor: pointer;
  transition: all 0.2s;
}
.journey-overview-btn:hover {
  background: var(--section-highlight);
  color: var(--text-primary);
}
.journey-timeline {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  width: 100%;
  padding: 0 10px;
  position: relative;
}
.journey-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  z-index: 2;
  width: 140px;
}
.step-circle-wrapper {
  position: relative;
  width: 72px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.step-circle-wrapper:hover {
  transform: scale(1.05);
}
.step-circle-outer {
  width: 100%;
  height: 100%;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}
.step-progress-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}
.journey-step.status-active .step-progress-svg {
  filter: drop-shadow(0 0 8px rgba(var(--step-color-rgb), 0.3));
}
.step-circle-inner {
  width: 61px;
  height: 61px;
  border-radius: 50%;
  background: var(--surface-card);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  transition: background 0.3s;
  z-index: 2;
}
.journey-step.status-locked .step-circle-inner {
  background: var(--main-bg);
  box-shadow: none;
}
.step-level-text {
  font-size: 8px;
  font-weight: 800;
  color: var(--text-secondary);
  opacity: 0.6;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  line-height: 1;
  margin-bottom: 2px;
}
.step-level-number {
  font-size: 26px;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1;
}
.journey-step.status-locked .step-level-number {
  color: var(--text-secondary);
  opacity: 0.7;
}
.step-badge {
  position: absolute;
  top: -2px;
  right: -2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 5;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}
.step-badge.completed {
  background: #10B981;
  color: #FFFFFF;
  border: 2px solid var(--surface-card);
}
.step-badge.locked {
  background: #FFFFFF;
  color: #64748B;
  border: 1px solid var(--border-color);
}
.step-active-pointer {
  position: absolute;
  bottom: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 6px solid var(--step-color);
  z-index: 10;
}
.step-label-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  text-align: center;
  margin-top: 4px;
}
.step-title {
  font-size: 15px;
  font-weight: 800;
  color: var(--text-primary);
  transition: color 0.3s;
}
.journey-step.status-active .step-title {
  color: var(--step-color);
}
.step-subtitle {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  opacity: 0.8;
}
.step-percent {
  font-size: 12px;
  font-weight: 800;
}
.journey-connector {
  flex: 1;
  height: 2px;
  background: var(--border-color);
  margin-top: 36px;
  position: relative;
  z-index: 1;
  min-width: 40px;
  transition: all 0.3s;
}
.journey-connector.status-completed {
  background: #FFC400;
}
.journey-connector.dashed {
  background: transparent;
  border-top: 2.5px dashed var(--border-color);
  height: 0;
}
.journey-connector:not(.dashed)::before,
.journey-connector:not(.dashed)::after {
  content: '';
  position: absolute;
  top: -3px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: inherit;
  transition: background 0.3s;
}
.journey-connector:not(.dashed)::before {
  left: 0;
}
.journey-connector:not(.dashed)::after {
  right: 0;
}
.action-cards-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  width: 100%;
}
.action-card {
  background: var(--section-highlight);
  border-radius: 20px;
  padding: 20px 16px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}
.action-card:hover {
  background: var(--section-highlight);
  transform: translateY(-4px);
}
.card-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  padding: 0 4px;
}
.card-step-badge {
  padding: 5px 10px;
  font-size: 10px;
  font-weight: 800;
  color: var(--step-color);
  background: rgba(var(--step-color-rgb), 0.1);
  border-radius: 9999px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  line-height: 1;
}
.card-header-status {
  display: flex;
  align-items: center;
  justify-content: center;
}
.status-badge-circle {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.status-badge-circle.completed {
  background: var(--step-color);
  color: var(--main-bg);
}
.status-badge-circle.locked {
  background: transparent;
  border: 1.5px solid var(--border-color);
  color: var(--text-secondary);
  opacity: 0.5;
}
.status-badge-circle.active {
  display: flex;
  align-items: center;
  justify-content: center;
}
.card-header-progress-svg {
  display: block;
}
.card-main-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(var(--step-color-rgb), 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--step-color);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.action-card:hover .card-main-icon {
  transform: scale(1.08);
}
.card-info {
  margin-bottom: 24px;
}
.card-info h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}
.card-info p {
  font-size: 12px;
  color: var(--text-secondary);
  opacity: 0.7;
}
.card-actions-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  margin-bottom: 24px;
}
.action-item-btn {
  width: 100%;
  padding: 10px;
  background: var(--section-highlight);
  border-radius: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
  border: none;
  cursor: pointer;
  transition: background 0.2s;
  text-align: left;
}
.action-item-btn:hover {
  background: var(--section-highlight);
}
.teach-asai-btn {
  width: 100%;
  padding: 16px;
  background: rgba(var(--step-color-rgb), 0.1);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 700;
  color: var(--step-color);
  border: none;
  cursor: pointer;
  transition: all 0.2s;
}
.teach-asai-btn:hover {
  background: rgba(var(--step-color-rgb), 0.15);
  transform: scale(1.02);
}
.card-progress-section {
  width: 100%;
  margin-top: auto;
}
.card-progress-bar {
  width: 100%;
  height: 4px;
  background: var(--section-highlight);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 8px;
}
.card-progress-fill {
  height: 100%;
  background: var(--step-color);
  box-shadow: 0 0 10px rgba(var(--step-color-rgb), 0.4);
}
.card-progress-text {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-faded);
}
.stats-bar {
  width: 100%;
  background-color: var(--input-bg);
  border-radius: 20px;
  padding: 24px 32px;
  display: grid;
  grid-template-columns: 1fr 1fr 1.2fr auto;
  align-items: center;
  gap: 32px;
  margin-top: 24px;
}
.stats-item {
  display: flex;
  align-items: center;
  gap: 16px;
}
.stats-circle-container {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 4px solid var(--section-highlight);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.stats-circle-progress {
  position: absolute;
  top: -4px;
  left: -4px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 4px solid var(--biology-color);
  border-left-color: transparent;
  border-bottom-color: transparent;
  transform: rotate(45deg);
}
.stats-percentage {
  font-size: 14px;
  font-weight: 800;
  color: var(--text-primary);
}
.stats-content h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2px;
}
.stats-content p {
  font-size: 12px;
  color: var(--text-secondary);
  opacity: 0.8;
}
.streak-icon {
  font-size: 24px;
}
.streak-days {
  color: var(--accent);
  font-weight: 800;
}
.score-badge {
  width: 52px;
  height: 52px;
  background: rgba(74, 222, 128, 0.1);
  clip-path: polygon(25% 0%, 75% 0%, 100% 50%, 75% 100%, 25% 100%, 0% 50%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #4ade80;
  font-weight: 800;
  font-size: 16px;
}
.score-main {
  font-weight: 800;
  color: #4ade80;
  font-size: 16px;
}
.score-total {
  color: var(--text-secondary);
  font-weight: 500;
}
.stats-chevron {
  color: var(--text-tertiary);
  opacity: 0.5;
}
.sidebar-footer {
  padding: 16px !important;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-top: none !important;
}
.sidebar-footer-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 8px;
}
.footer-nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}
.footer-nav-item:hover {
  background: var(--section-highlight);
  color: var(--text-primary);
}
.profile-card {
  border-radius: 14px;
  padding: 10px 12px;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  transition: background 0.2s;
}
.profile-card:hover {
  background: var(--nav-active-bg);
}
.profile-main-info {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 0;
}
.profile-avatar-wrapper {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  overflow: hidden;
  position: relative;
  background: var(--nav-active-bg);
  flex-shrink: 0;
}
.profile-avatar-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.profile-avatar-wrapper .header-profile-avatar {
  width: 100%;
  height: 100%;
  font-size: 15px;
}
.profile-text-info {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.profile-name {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-family: 'Plus Jakarta Sans', 'Inter', sans-serif;
}
.profile-subtitle {
  font-size: 10.5px;
  color: var(--text-secondary);
  font-family: 'Plus Jakarta Sans', 'Inter', sans-serif;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.streak-badge-mini {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--nav-active-bg);
  border: 1.5px solid var(--border-color);
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  gap: 2px;
}
.streak-icon-mini {
  font-size: 14px;
  line-height: 1;
}
.streak-info-mini {
  display: flex;
  align-items: center;
}
.streak-days-mini {
  font-size: 13px;
  font-weight: 800;
  color: var(--text-primary);
  font-family: 'Plus Jakarta Sans', 'Inter', sans-serif;
  line-height: 1;
}
.streak-label-mini {
  display: none;
}
.collapsed .profile-card {
  padding: 8px;
  align-items: center;
}
.collapsed .profile-text-info,
.collapsed .profile-subtitle,
.collapsed .streak-badge-mini {
  display: none;
}
.history-popup {
  position: fixed;
  background: var(--surface-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: none;
  border-radius: 12px;
  padding: 8px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
  min-width: 220px;
  max-width: 280px;
  z-index: 10000;
  animation: slideInFromLeft 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: auto;
}
@keyframes slideInFromLeft {
  from {
    opacity: 0;
    transform: translateX(-8px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}
.history-popup-title-bar {
  padding: 8px 12px 6px;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  opacity: 0.7;
}
.history-popup-separator {
  display: none;
}
.history-popup-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  max-height: 300px;
  overflow-y: auto;
}
.history-popup-date {
  padding: 12px 12px 4px;
  font-size: 10px;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  opacity: 0.5;
  letter-spacing: 0.3px;
}
.history-popup-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 13px;
  color: var(--text-primary);
  cursor: pointer;
  transition: background 0.2s;
  text-decoration: none;
}
.history-popup-item:hover {
  background: var(--section-highlight);
}
.history-popup-item-text {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.4;
}
.history-popup-footer {
  padding-top: 8px;
  margin-top: 8px;
  border-top: none;
}
.history-popup-see-all {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 13px;
  color: var(--text-primary);
  cursor: pointer;
  transition: background 0.2s;
  text-decoration: none;
}
.history-popup-see-all:hover {
  background: var(--section-highlight);
}
.history-popup-empty {
  padding: 24px 12px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 13px;
  opacity: 0.6;
}
.curriculum-picker-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 11000;
  animation: fadeIn 0.18s ease;
  padding: 24px;
}
.curriculum-picker-modal {
  background: var(--sidebar-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  width: 100%;
  max-width: 680px;
  max-height: 78vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 32px 96px var(--modal-shadow), 0 0 0 0.5px rgba(255, 255, 255, 0.04) inset;
  animation: modalScaleUp 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  overflow: hidden;
}
.curriculum-picker-header {
  padding: 24px 24px 0;
  border-bottom: 1px solid var(--border-color);
}
.curriculum-picker-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 20px;
}
.curriculum-picker-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 4px;
  letter-spacing: -0.3px;
}
.curriculum-picker-subtitle {
  font-size: 13px;
  color: var(--text-tertiary);
  margin: 0;
}
.curriculum-picker-close {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, color 0.15s;
  flex-shrink: 0;
}
.curriculum-picker-close:hover {
  background: var(--bg-active);
  color: var(--text-primary);
}
.curriculum-picker-search {
  position: relative;
  margin-bottom: 16px;
}
.curriculum-picker-search-icon {
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
}
.curriculum-picker-search input {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 400;
  padding: 8px 0 12px 28px;
  outline: none;
  transition: border-color 0.15s;
  box-sizing: border-box;
}
.curriculum-picker-search input::placeholder {
  color: var(--text-tertiary);
  font-weight: 400;
}
.curriculum-picker-search input:focus {
  border-bottom-color: var(--accent);
}
.curriculum-picker-tabs {
  display: flex;
  gap: 2px;
  padding-bottom: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.curriculum-picker-tabs::-webkit-scrollbar {
  display: none;
}
.curriculum-picker-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 9px 14px 10px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-tertiary);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  white-space: nowrap;
  margin-bottom: -1px;
}
.curriculum-picker-tab:hover {
  color: var(--text-primary);
}
.curriculum-picker-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.curriculum-picker-tab-count {
  font-size: 11px;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 10px;
  background: var(--section-highlight);
  color: var(--text-tertiary);
}
.curriculum-picker-tab.active .curriculum-picker-tab-count {
  background: rgba(var(--accent-rgb), 0.15);
  color: var(--accent);
}
.curriculum-picker-body {
  flex: 1;
  overflow-y: auto;
  padding: 20px 24px 24px;
  scrollbar-width: thin;
  scrollbar-color: var(--bg-tertiary) transparent;
}
.curriculum-picker-body::-webkit-scrollbar {
  width: 4px;
}
.curriculum-picker-body::-webkit-scrollbar-track {
  background: transparent;
}
.curriculum-picker-body::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 4px;
}
.curriculum-picker-group-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 10px;
}
.curriculum-picker-group+.curriculum-picker-group {
  margin-top: 24px;
}
.curriculum-picker-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(188px, 1fr));
  gap: 8px;
}
.curriculum-picker-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 14px 14px 12px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  background: var(--surface-card);
  cursor: pointer;
  text-align: left;
  transition: border-color 0.15s, background 0.15s, transform 0.15s, box-shadow 0.15s;
  overflow: hidden;
}
.curriculum-picker-card:hover {
  border-color: var(--nav-active-bg);
  background: var(--bg-active);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--drop-shadow);
}
.curriculum-picker-card.selected {
  border-color: var(--accent);
  background: rgba(var(--accent-rgb), 0.06);
}
.curriculum-picker-card.selected:hover {
  border-color: var(--accent);
  background: rgba(var(--accent-rgb), 0.1);
}
.curriculum-card-accent {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 2px 2px 0 0;
  opacity: 0.5;
  transition: opacity 0.15s;
}
.curriculum-picker-card:hover .curriculum-card-accent,
.curriculum-picker-card.selected .curriculum-card-accent {
  opacity: 1;
}
.curriculum-card-subject {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}
.curriculum-card-icon {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background: var(--section-highlight);
}
.curriculum-card-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
}
.curriculum-card-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: auto;
}
.curriculum-card-code {
  font-size: 11px;
  font-family: 'SF Mono', 'Fira Code', monospace;
  color: var(--text-faded);
  letter-spacing: 0.03em;
}
.curriculum-card-version {
  font-size: 11px;
  color: var(--text-tertiary);
}
.curriculum-card-selected-dot {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}
.curriculum-picker-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 0;
  color: var(--text-tertiary);
  gap: 10px;
  font-size: 14px;
}
@keyframes ciPanelFadeIn {
  from {
    opacity: 0;
    transform: translateY(-8px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}
.formatted-content {
  line-height: 1.6;
  white-space: normal;
}
.formatted-content h1,
.formatted-content h2,
.formatted-content h3,
.formatted-content h4,
.formatted-content h5,
.formatted-content h6 {
  margin-top: 0.6em;
  margin-bottom: 0.3em;
  font-weight: 600;
  color: var(--text-primary);
}
.formatted-content h1 {
  font-size: 1.6em;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.2em;
}
.formatted-content h2 {
  font-size: 1.4em;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.2em;
}
.formatted-content h3 {
  font-size: 1.2em;
}
.formatted-content h4 {
  font-size: 1.1em;
}
.formatted-content hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 1em 0;
}
.formatted-content p {
  margin: 0.4em 0;
}
.formatted-content ul {
  margin: 0.5em 0;
  padding-left: 1.5em;
  list-style-type: disc !important;
}
.formatted-content ol {
  margin: 0.5em 0;
  padding-left: 1.5em;
  list-style-type: decimal !important;
}
.formatted-content li {
  margin: 0.15em 0;
}
.formatted-content strong {
  font-weight: 600;
  color: var(--text-primary);
}
.formatted-content code {
  background-color: var(--input-bg);
  padding: 0.2em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--text-primary);
}
.formatted-content pre {
  background-color: var(--input-bg);
  padding: 1em;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1em 0;
  border: 1px solid var(--border-color);
}
.formatted-content pre code {
  background: none;
  padding: 0;
}
.formatted-content blockquote {
  border-left: 3px solid var(--border-color);
  padding-left: 1em;
  margin: 1em 0;
  color: var(--text-secondary);
  font-style: italic;
}
.formatted-content .MathJax {
  color: var(--text-primary) !important;
}
.formatted-content .MathJax_Display {
  margin: 1.5em 0;
  text-align: center;
}
.formatted-content mjx-container {
  display: inline-block;
  margin: 0.5em 0;
}
.formatted-content mjx-container[display="true"] {
  display: block;
  margin: 1.5em auto;
  text-align: center;
}
.all-files-modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 11000;
  animation: fadeIn 0.18s ease;
  padding: 24px;
}
.all-files-modal {
  background-color: var(--main-bg);
  border-radius: 16px;
  width: 90%;
  max-width: 900px;
  height: 80vh;
  min-height: 500px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  overflow: hidden;
  border: 1px solid var(--border-color);
  animation: modalScaleUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.all-files-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 24px 28px 18px;
  border-bottom: 1px solid var(--border-color);
}
.all-files-modal-header .header-titles {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.all-files-modal-header h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}
.all-files-modal-header .header-subtitle {
  font-size: 13.5px;
  color: var(--text-secondary);
  margin: 0;
}
.all-files-modal-close {
  background: var(--nav-active-bg);
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 8px;
  border-radius: 10px;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.all-files-modal-close:hover {
  background: var(--bg-active);
  color: var(--text-primary);
}
.modal-divider {
  height: 1px;
  background: var(--border-color);
  margin: 0;
}
.all-files-modal-body {
  padding: 20px 28px 28px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow: hidden;
}
.curriculum-sticky-header {
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex-shrink: 0;
}
.curriculum-section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.curriculum-section-header h3 {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin: 0;
}
.curriculum-section-header .subject-count {
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 500;
}
.curriculum-filters {
  display: flex;
  gap: 12px;
  padding: 0 4px 16px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  margin-bottom: 8px;
}
.curriculum-filters::-webkit-scrollbar {
  display: none;
}
.curriculum-filters .filter-chip {
  min-width: 130px;
  padding: 10px 16px;
  background: var(--tool-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 2px;
  transition: all 0.25s ease;
  flex-shrink: 0;
}
.curriculum-filters .filter-chip:hover {
  border-color: var(--accent);
  background: var(--bg-active);
}
.curriculum-filters .filter-chip.active {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 16px rgba(255, 193, 7, 0.25);
}
.curriculum-filters .filter-chip.active .filter-label {
  color: #000;
}
.curriculum-filters .filter-chip.active .filter-desc {
  color: rgba(0, 0, 0, 0.7);
}
.curriculum-filters .filter-chip .filter-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
}
.curriculum-filters .filter-chip .filter-desc {
  font-size: 9.5px;
  color: var(--text-tertiary);
}
.curriculum-search-container {
  width: 100%;
}
.curriculum-search-container .search-wrapper {
  position: relative;
  width: 100%;
}
.curriculum-search-container .search-input {
  width: 100%;
  padding: 12px 16px 12px 42px;
  background: var(--input-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  color: var(--text-primary);
  font-size: 14.5px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
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  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.05);
}
.curriculum-search-container .search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
}
.curricula-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-bottom: 8px;
  overflow-y: auto;
  flex: 1;
}
.curricula-list .curriculum-card {
  background: var(--tool-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 24px;
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}
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  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}
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  display: flex;
  flex-direction: column;
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  flex: 1;
}
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  display: flex;
  gap: 8px;
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}
.curricula-list .curriculum-card .card-header-meta span {
  font-size: 10px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 8px;
  letter-spacing: 0.3px;
}
.curricula-list .curriculum-card .card-header-meta .badge-igcse {
  background: rgba(43, 114, 229, 0.15);
  color: #4f8df5;
}
.curricula-list .curriculum-card .card-header-meta .badge-code {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-secondary);
}
.curricula-list .curriculum-card h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.2;
}
.curricula-list .curriculum-card .card-description {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
}
.curricula-list .curriculum-card .card-footer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 4px;
}
.curricula-list .curriculum-card .card-footer-meta .meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 13px;
}
.curricula-list .curriculum-card .card-footer-meta .meta-item i {
  font-size: 13px;
}
.curricula-list .curriculum-card .card-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 170px;
  flex-shrink: 0;
}
.curricula-list .curriculum-card .card-actions button {
  width: 100%;
  padding: 12px 20px;
  border-radius: 10px;
  font-size: 13.5px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}
.curricula-list .curriculum-card .card-actions .btn-start-learning {
  background: var(--accent);
  color: #000;
}
.curricula-list .curriculum-card .card-actions .btn-start-learning:hover {
  opacity: 0.9;
}
.curricula-list .curriculum-card .card-actions .btn-view-syllabus {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-primary);
}
.curricula-list .curriculum-card .card-actions .btn-view-syllabus:hover {
  background: var(--bg-active);
  border-color: rgba(255, 255, 255, 0.3);
}
.logout-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: logout-fade-in 0.2s ease-out;
}
.logout-popup {
  width: 90%;
  max-width: 400px;
  background: var(--modal-card-bg, var(--surface-card));
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.3);
  animation: logout-scale-up 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.logout-icon {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(239, 68, 68, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: #ef4444;
}
.logout-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 10px;
  text-align: center;
  letter-spacing: -0.02em;
  line-height: 1.3;
}
.logout-subtitle {
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--text-secondary);
  text-align: center;
  margin: 0 0 28px;
}
.logout-subtitle strong {
  color: var(--text-primary);
  font-weight: 600;
}
.logout-btn-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
}
.logout-confirm-btn {
  width: 100%;
  padding: 12px 20px;
  border-radius: 999px;
  background: #ef4444;
  border: none;
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.15s;
}
.logout-confirm-btn:hover {
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  transform: translateY(-1px);
}
.logout-confirm-btn:active {
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}
.logout-cancel-btn {
  width: 100%;
  padding: 12px 20px;
  border-radius: 999px;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.15s;
}
.logout-cancel-btn:hover {
  background: var(--bg-tertiary);
  transform: translateY(-1px);
}
.logout-cancel-btn:active {
  transform: translateY(0);
}
@keyframes logout-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
@keyframes logout-scale-up {
  from {
    opacity: 0;
    transform: scale(0.93);
  }
  to {
    opacity: 1;
    transform: scale(1);
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