:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --border-color: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent-blue: #38bdf8;
  --accent-purple: #a855f7;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --accent-indigo: #6366f1;
  --accent-cyan: #06b6d4;

  --card-bg: #1e293b;
  --card-hover: #273549;
  --sidebar-width: 290px;
  --header-height: 68px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
}


[data-theme="dark"],
[data-theme="midnight"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --border-color: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-blue: #38bdf8;
  --accent-purple: #a855f7;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --accent-indigo: #6366f1;
  --accent-cyan: #06b6d4;
  --card-bg: #1e293b;
  --card-hover: #273549;
}

[data-theme="oled"] {
  --bg-primary: #000000;
  --bg-secondary: #0c0d12;
  --bg-tertiary: #171922;
  --border-color: #222634;
  --text-primary: #ffffff;
  --text-secondary: #9ba8ba;
  --text-muted: #5e6b7d;
  --accent-blue: #00d2ff;
  --accent-purple: #c084fc;
  --accent-emerald: #00f090;
  --accent-amber: #fbbf24;
  --accent-rose: #ff4365;
  --accent-indigo: #818cf8;
  --accent-cyan: #22d3ee;
  --card-bg: #08090d;
  --card-hover: #12141c;
}

[data-theme="twilight"] {
  --bg-primary: #120e24;
  --bg-secondary: #1d1738;
  --bg-tertiary: #2e2456;
  --border-color: #3a2e6b;
  --text-primary: #f5f3ff;
  --text-secondary: #c4b5fd;
  --text-muted: #8b5cf6;
  --accent-blue: #a78bfa;
  --accent-purple: #e879f9;
  --accent-emerald: #34d399;
  --accent-amber: #fbbf24;
  --accent-rose: #f472b6;
  --accent-indigo: #a78bfa;
  --accent-cyan: #38bdf8;
  --card-bg: #1a1433;
  --card-hover: #261d4a;
}

[data-theme="emerald"] {
  --bg-primary: #061712;
  --bg-secondary: #0d2720;
  --bg-tertiary: #153c32;
  --border-color: #1e5244;
  --text-primary: #ecfdf5;
  --text-secondary: #a7f3d0;
  --text-muted: #4ade80;
  --accent-blue: #2dd4bf;
  --accent-purple: #c084fc;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #fb7185;
  --accent-indigo: #818cf8;
  --accent-cyan: #2dd4bf;
  --card-bg: #0b221b;
  --card-hover: #13352b;
}

[data-theme="sepia"] {
  --bg-primary: #fcf4e4;
  --bg-secondary: #f5e7cc;
  --bg-tertiary: #ebd7b5;
  --border-color: #d6be92;
  --text-primary: #3b2c1a;
  --text-secondary: #665036;
  --text-muted: #947a59;
  --accent-blue: #92400e;
  --accent-purple: #7e22ce;
  --accent-emerald: #065f46;
  --accent-amber: #b45309;
  --accent-rose: #be123c;
  --accent-indigo: #4338ca;
  --accent-cyan: #0e7490;
  --card-bg: #fffaf0;
  --card-hover: #f9eed9;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --border-color: #e2e8f0;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --accent-blue: #0284c7;
  --accent-purple: #9333ea;
  --accent-emerald: #059669;
  --accent-amber: #d97706;
  --accent-rose: #e11d48;
  --accent-indigo: #4f46e5;
  --accent-cyan: #0891b2;
  --card-bg: #ffffff;
  --card-hover: #f8fafc;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -webkit-user-select: none;
  user-select: none;
  scrollbar-width: none !important;
  -ms-overflow-style: none !important;
}

/* Eradicate unwanted vertical scrollbar on the right */
::-webkit-scrollbar {
  width: 0px !important;
  height: 0px !important;
  display: none !important;
  background: transparent !important;
}

html, body {
  scrollbar-width: none !important;
  -ms-overflow-style: none !important;
}

input,
textarea,
[contenteditable="true"],
.notes-area,
.selectable-text,
.ipad-url-input {
  -webkit-user-select: text;
  user-select: text;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  display: flex;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  height: 100vh;
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  z-index: 20;
}

.brand-header {
  padding: 50px 20px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  border-bottom: 1px solid var(--border-color);
  -webkit-app-region: drag;
  -webkit-user-select: none !important;
  user-select: none !important;
  cursor: grab;
}

.brand-header:active {
  cursor: grabbing;
}

.brand-header * {
  pointer-events: none !important;
  -webkit-user-select: none !important;
  user-select: none !important;
}

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #0284d7, #071228);
  border: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: 0 4px 14px rgba(2, 132, 215, 0.35);
  flex-shrink: 0;
}

.brand-title {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.2;
}

.brand-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-top: 2px;
}

.sidebar-scroll {
  padding: 16px;
  overflow-y: auto;
  flex: 1;
}

.filter-group {
  margin-bottom: 24px;
}

.filter-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.filter-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.filter-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: left;
}

.filter-btn:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.filter-btn.active {
  background-color: rgba(56, 189, 248, 0.15);
  border-color: rgba(56, 189, 248, 0.35);
  color: var(--accent-blue);
  font-weight: 600;
}

.filter-label-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.filter-badge {
  font-size: 0.72rem;
  padding: 2px 7px;
  border-radius: 10px;
  background-color: var(--bg-tertiary);
  color: var(--text-muted);
  font-weight: 600;
}

.filter-btn.active .filter-badge {
  background-color: var(--accent-blue);
  color: #ffffff !important;
  font-weight: 700;
}

.source-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* Main Content Area */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background-color: var(--bg-primary);
}

/* Top App Header */
.app-header {
  height: 72px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 10;
  -webkit-app-region: no-drag;
  -webkit-user-select: none;
  user-select: none;
}

body.is-standalone-app {
  -webkit-user-select: none;
  user-select: none;
}

/* Standalone macOS Traffic Lights Clearance & Generous Drag Region in Sidebar */
body.is-standalone-app .brand-header {
  padding-top: 50px; /* Elegant clearance for macOS traffic light buttons (close, min, zoom) */
  padding-bottom: 20px;
  padding-left: 20px;
  padding-right: 20px;
  -webkit-app-region: drag;
  -webkit-user-select: none !important;
  user-select: none !important;
  cursor: grab;
}

body.is-standalone-app .brand-header:active {
  cursor: grabbing;
}

body.is-standalone-app .brand-header * {
  pointer-events: none !important;
  -webkit-app-region: drag;
  -webkit-user-select: none !important;
  user-select: none !important;
}

body.is-standalone-app .sidebar-scroll {
  -webkit-app-region: no-drag;
}

/* Standalone macOS Top App Header */
body.is-standalone-app .app-header {
  height: 74px;
  padding: 0 24px;
  -webkit-app-region: no-drag;
  -webkit-user-select: none;
  user-select: none;
}

/* Only when sidebar is collapsed (e.g. tablet drawer) does app-header need traffic light clearance */
@media (max-width: 1024px) {
  body.is-standalone-app .app-header {
    padding-left: 86px;
  }
}

body.is-standalone-app .search-container,
body.is-standalone-app .header-actions,
body.is-standalone-app .sidebar-toggle-btn {
  -webkit-app-region: no-drag;
}

body.is-standalone-app .notes-area,
body.is-standalone-app .search-input {
  -webkit-user-select: text;
  user-select: text;
}

.search-container {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 14px;
  color: var(--text-muted);
  font-size: 1rem;
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 10px 42px 10px 38px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
  transition: all 0.2s ease;
}

.search-input:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
}

.kbd-shortcut {
  position: absolute;
  right: 12px;
  padding: 2px 6px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 0.7rem;
  color: var(--text-muted);
  font-family: monospace;
  pointer-events: none;
}

.search-clear-btn {
  position: absolute;
  right: 44px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: none;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
}

.search-clear-btn:hover {
  background: var(--accent-rose);
  color: #ffffff;
}

.ipad-btn {
  background: rgba(56, 189, 248, 0.12) !important;
  border: 1px solid rgba(56, 189, 248, 0.35) !important;
  color: #38bdf8 !important;
  font-weight: 600 !important;
  gap: 6px !important;
  display: inline-flex !important;
  align-items: center !important;
}

.ipad-btn:hover {
  background: rgba(56, 189, 248, 0.22) !important;
  border-color: #38bdf8 !important;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.view-toggle {
  display: flex;
  background-color: var(--bg-primary);
  padding: 3px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.view-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 6px 10px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

.view-btn.active {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.btn-icon {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
}

.btn-icon:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

/* Stats / Filter Chips Bar */
.context-bar {
  padding: 12px 28px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.stats-summary {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.stat-item strong {
  color: var(--text-primary);
}

.progress-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-tertiary);
  padding: 4px 10px;
  border-radius: 20px;
  border: 1px solid var(--border-color);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.progress-track {
  width: 70px;
  height: 6px;
  background-color: var(--border-color);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-emerald), var(--accent-blue));
  border-radius: 3px;
  transition: width 0.3s ease;
}

.offline-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-emerald);
  transition: all 0.2s ease;
}

.offline-pill.offline-caching {
  background: rgba(56, 189, 248, 0.12);
  border-color: rgba(56, 189, 248, 0.3);
  color: var(--accent-blue);
}

.offline-dot {
  font-size: 0.7rem;
  line-height: 1;
}

.chips-container {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.chip-filter {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 4px 11px;
  font-size: 0.78rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
  font-weight: 500;
}

.chip-filter:hover {
  border-color: var(--text-muted);
  color: var(--text-primary);
  background: var(--card-hover);
}

.chip-filter.active {
  background: rgba(56, 189, 248, 0.15);
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  font-weight: 700;
}

.chip-clear {
  color: var(--accent-rose);
  font-size: 0.78rem;
  cursor: pointer;
  background: none;
  border: none;
  margin-left: 6px;
}

/* Main Grid & Cards */
.catalog-container {
  padding: 24px 28px;
  flex: 1;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.resource-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
  position: relative;
}

.resource-card:hover {
  transform: translateY(-2px);
  border-color: #475569;
  box-shadow: 0 10px 24px -6px rgba(0, 0, 0, 0.3);
}

.resource-card.completed {
  border-color: rgba(16, 185, 129, 0.4);
}

.resource-card.completed::before {
  content: "✓ COMPLETED";
  position: absolute;
  top: 10px;
  right: 10px;
  background: #10b981;
  color: #0f172a;
  font-size: 0.65rem;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: 4px;
  z-index: 5;
  letter-spacing: 0.04em;
}

/* Card Thumbnail */
.card-thumbnail-wrap {
  width: 100%;
  height: 160px;
  position: relative;
  background-color: #0b1120;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  cursor: pointer;
}

.card-thumbnail-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.25s ease;
}

.card-thumbnail-wrap:hover .card-thumbnail-img {
  transform: scale(1.04);
}

.duration-badge {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(15, 23, 42, 0.88);
  backdrop-filter: blur(4px);
  color: #38bdf8;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  border: 1px solid rgba(56, 189, 248, 0.3);
  display: flex;
  align-items: center;
  gap: 4px;
  z-index: 2;
}

.resource-card.is-pdf {
  border-color: rgba(168, 85, 247, 0.25);
}

.resource-card.is-pdf:hover {
  border-color: rgba(168, 85, 247, 0.5);
  box-shadow: 0 10px 24px -6px rgba(168, 85, 247, 0.2);
}

.media-badge-pdf {
  background: rgba(124, 58, 237, 0.9) !important;
  color: #ffffff !important;
  border: 1px solid rgba(255, 255, 255, 0.25) !important;
}

.btn-view-pdf {
  background: linear-gradient(135deg, #7c3aed, #6366f1);
  color: #ffffff;
  border: none;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
}

.btn-view-pdf:hover {
  background: linear-gradient(135deg, #6d28d9, #4f46e5);
  transform: translateY(-1px);
}

.preview-iframe-wrapper {
  width: 100%;
  height: 480px;
  background: #090d16;
  border-radius: var(--radius-sm);
  overflow: hidden;
  position: relative;
  border: 1px solid var(--border-color);
  margin-bottom: 14px;
}

.drive-preview-iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

.thumbnail-svg {
  width: 100%;
  height: 100%;
}

.media-badge {
  position: absolute;
  bottom: 8px;
  left: 8px;
  background: rgba(15, 23, 42, 0.82);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  color: #f8fafc !important;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  gap: 4px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.size-badge {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(15, 23, 42, 0.82);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  color: #e2e8f0 !important;
  font-size: 0.7rem;
  font-family: monospace;
  font-weight: 600;
  padding: 3px 7px;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.play-overlay {
  position: absolute;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: rgba(56, 189, 248, 0.95);
  color: #0f172a;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 800;
  opacity: 0;
  transform: scale(0.8);
  transition: all 0.2s ease;
  box-shadow: 0 4px 16px rgba(56, 189, 248, 0.4);
}

.card-thumbnail-wrap:hover .play-overlay {
  opacity: 1;
  transform: scale(1);
}

/* Card Body */
.card-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  flex: 1;
  gap: 8px;
}

.card-tags {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.tag-badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.tag-badge:hover {
  opacity: 0.85;
}

.tag-system {
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
}

.card-title {
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  cursor: pointer;
}

.card-title:hover {
  color: var(--accent-blue);
}

.card-scene-title {
  font-size: 0.8rem;
  color: var(--accent-purple);
  font-style: italic;
  font-weight: 500;
}

.card-subtopic {
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Card Actions Footer */
.card-footer {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.btn-play-inapp {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background: #2563eb;
  color: white;
  border: none;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.btn-play-inapp:hover {
  background-color: #1d4ed8;
}

.card-quick-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.btn-card-icon {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-card-icon:hover {
  color: var(--text-primary);
  border-color: #64748b;
}

.btn-card-icon.starred {
  color: var(--accent-amber);
  border-color: var(--accent-amber);
  background: rgba(245, 158, 11, 0.15);
}

.btn-card-icon.completed {
  color: var(--accent-emerald);
  border-color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.15);
}

/* In-App Video Player Section in Modal */
.video-player-wrapper {
  width: 100%;
  background: #000;
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
  aspect-ratio: 16 / 9;
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-element,
.native-video-player {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #000;
  outline: none;
}

.video-quick-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0 6px 0;
  gap: 10px;
  flex-wrap: wrap;
}

.video-controls-left,
.video-controls-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.speed-selector {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--bg-primary);
  padding: 3px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.btn-speed {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 3px 8px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-speed:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.btn-speed.active {
  background: var(--accent-blue);
  color: #ffffff;
}

.btn-video-control {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 5px 12px;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: all 0.15s ease;
  user-select: none;
}

.btn-video-control:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--accent-blue);
}

.btn-video-control.active {
  background: var(--bg-tertiary);
  border-color: var(--accent-purple);
  color: var(--accent-purple);
}

.btn-video-fullscreen {
  background: rgba(14, 165, 233, 0.15);
  color: var(--accent-blue);
  border-color: rgba(14, 165, 233, 0.35);
}

.btn-video-fullscreen:hover {
  background: var(--accent-blue);
  color: #ffffff;
}

.btn-video-fullscreen.active {
  background: rgba(239, 68, 68, 0.15);
  color: var(--accent-rose);
  border-color: rgba(239, 68, 68, 0.35);
}

/* Modal Theater Mode */
.modal-content.theater-mode {
  max-width: 96vw !important;
  width: 96vw !important;
  max-height: 96vh !important;
  height: 96vh !important;
}

.modal-content.theater-mode .video-player-wrapper {
  max-height: 72vh;
  aspect-ratio: auto;
  height: 70vh;
}

/* Fullscreen Media Rules */
:fullscreen .native-video-player,
:-webkit-full-screen .native-video-player,
.native-video-player:fullscreen,
.native-video-player:-webkit-full-screen {
  width: 100vw !important;
  height: 100vh !important;
  max-width: 100vw !important;
  max-height: 100vh !important;
  object-fit: contain !important;
  background: #000000 !important;
}

/* Watch History Drawer / View */
.history-timeline {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  gap: 14px;
  transition: all 0.15s ease;
}

.history-item:hover {
  background-color: var(--card-hover);
  border-color: #475569;
}

.history-time-badge {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: monospace;
}

/* Deep Concepts Section */
.deep-concepts-box {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  margin-top: 4px;
}

.concepts-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-blue);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.concept-pills-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.concept-pill {
  font-size: 0.72rem;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: #e0f2fe;
  padding: 3px 8px;
  border-radius: 4px;
}

/* Modal / Drawer */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(5px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.modal-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  width: 92%;
  max-width: 820px;
  max-height: 92vh;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow-y: auto;
  box-shadow: 0 24px 48px rgba(0,0,0,0.5);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.modal-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.6rem;
  cursor: pointer;
  line-height: 1;
}

.modal-close-btn:hover {
  color: var(--text-primary);
}

.notes-area {
  width: 100%;
  min-height: 90px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 10px;
  font-family: inherit;
  font-size: 0.85rem;
  resize: vertical;
  outline: none;
}

.notes-area:focus {
  border-color: var(--accent-blue);
}

/* Table View */
.table-container {
  width: 100%;
  overflow-x: auto;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.curriculum-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  text-align: left;
}

.curriculum-table th {
  padding: 12px 16px;
  background-color: var(--bg-primary);
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-color);
}

.curriculum-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.curriculum-table tr:hover td {
  background-color: var(--card-hover);
}

.curriculum-table tr.completed td {
  opacity: 0.75;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 12px;
}

/* Entity Pills on Cards and Modal */
.card-pills-row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin: 6px 0;
}

.entity-pill {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 2px 7px;
  background: rgba(56, 189, 248, 0.1);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 12px;
  font-size: 0.7rem;
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
  transition: all 0.15s ease;
}

.entity-pill:hover {
  background: rgba(56, 189, 248, 0.22);
  border-color: #38bdf8;
  transform: translateY(-1px);
}

.entity-tag-clickable {
  cursor: pointer;
  transition: all 0.15s ease;
}

.entity-tag-clickable:hover {
  filter: brightness(1.2);
  transform: translateY(-1px);
}

/* User Custom Tags Section */
.modal-tags-section {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 4px 0;
}

.modal-section-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.modal-user-tags-list {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  align-items: center;
}

.user-tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  background: rgba(168, 85, 247, 0.15);
  border: 1px solid rgba(168, 85, 247, 0.35);
  color: var(--accent-purple);
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.user-tag-pill:hover {
  background: rgba(168, 85, 247, 0.25);
  border-color: var(--accent-purple);
  transform: translateY(-1px);
}

.entity-pill-user {
  background: rgba(168, 85, 247, 0.15) !important;
  color: var(--accent-purple) !important;
  border-color: rgba(168, 85, 247, 0.35) !important;
  font-weight: 600;
}

.entity-pill-user:hover {
  background: rgba(168, 85, 247, 0.25) !important;
  border-color: var(--accent-purple) !important;
}

.user-tag-remove {
  background: transparent;
  border: none;
  color: inherit;
  font-size: 13px;
  line-height: 1;
  cursor: pointer;
  padding: 0;
  margin-left: 2px;
  opacity: 0.7;
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.user-tag-remove:hover {
  opacity: 1;
  transform: scale(1.2);
}

.btn-add-tag {
  background: transparent;
  border: 1px dashed var(--border-color);
  color: var(--text-muted);
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
}

.btn-add-tag:hover {
  border-color: var(--accent-purple);
  color: var(--accent-purple);
  background: rgba(168, 85, 247, 0.08);
}

.tag-input-container {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--bg-primary);
  border: 1px solid var(--accent-purple);
  border-radius: 14px;
  padding: 2px 4px 2px 8px;
  box-shadow: 0 0 0 2px rgba(168, 85, 247, 0.2);
}

.modal-tag-input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 0.78rem;
  width: 140px;
  padding: 2px 0;
  -webkit-user-select: text !important;
  user-select: text !important;
}

.btn-tag-save {
  background: var(--accent-purple);
  color: #ffffff;
  border: none;
  border-radius: 10px;
  padding: 2px 8px;
  font-size: 0.72rem;
  font-weight: 700;
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.btn-tag-save:hover {
  opacity: 0.9;
}

.btn-tag-cancel {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
  padding: 2px 4px;
}

.btn-tag-cancel:hover {
  color: var(--accent-rose);
}

[data-theme="light"] .user-tag-pill {
  background: rgba(147, 51, 234, 0.08);
  border-color: rgba(147, 51, 234, 0.3);
  color: #7e22ce;
}

[data-theme="light"] .btn-add-tag {
  border-color: #cbd5e1;
  color: #64748b;
}

[data-theme="light"] .btn-add-tag:hover {
  border-color: #9333ea;
  color: #9333ea;
  background: rgba(147, 51, 234, 0.08);
}

[data-theme="light"] .entity-pill-user {
  background: rgba(147, 51, 234, 0.08) !important;
  color: #7e22ce !important;
  border-color: rgba(147, 51, 234, 0.3) !important;
}

[data-theme="light"] .entity-pill-user:hover {
  background: rgba(147, 51, 234, 0.16) !important;
}

[data-theme="light"] .btn-video-control {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #334155;
}

[data-theme="light"] .btn-video-control:hover {
  background: #f1f5f9;
  color: #0f172a;
}

[data-theme="light"] .btn-video-fullscreen {
  background: #e0f2fe;
  color: #0284c7;
  border-color: #bae6fd;
}

[data-theme="light"] .btn-video-fullscreen:hover {
  background: #0284c7;
  color: #ffffff;
}

/* ==========================================================================
   iPad & Tablet Off-Canvas Drawer, PWA, and Touch Ergonomics
   ========================================================================== */

/* Drawer Toggle & Close Buttons (default hidden on large desktop) */
.sidebar-toggle-btn {
  display: none;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  height: 40px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.15s ease;
}

.sidebar-toggle-btn:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

.sidebar-close-btn {
  display: none;
  position: absolute;
  top: 16px;
  right: 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 1.4rem;
  cursor: pointer;
  line-height: 1;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  z-index: 1001;
  transition: all 0.15s ease;
}

.sidebar-close-btn:hover {
  background: var(--accent-rose);
  color: #fff;
}

.sidebar-backdrop {
  display: none;
}

/* Connect iPad Modal Styles */
.ipad-modal-content {
  max-width: 760px;
  width: 92%;
}

.ipad-modal-body {
  display: flex;
  gap: 24px;
  align-items: stretch;
  margin-top: 8px;
}

.ipad-qr-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  flex-shrink: 0;
  min-width: 250px;
}

.qr-target-box {
  background: #ffffff;
  padding: 12px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.qr-target-box canvas,
.qr-target-box img {
  display: block !important;
  max-width: 190px !important;
  max-height: 190px !important;
}

.qr-caption {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 12px;
  font-weight: 500;
}

.ipad-instructions-card {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.ipad-steps-list {
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.ipad-steps-list strong {
  display: block;
  color: var(--text-primary);
  font-size: 0.92rem;
  margin-bottom: 2px;
}

.ipad-url-box {
  display: flex;
  gap: 8px;
  margin-top: 6px;
}

.ipad-url-input {
  flex: 1;
  padding: 8px 12px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--accent-blue);
  font-family: monospace;
  font-size: 0.82rem;
  outline: none;
}

.btn-copy-url {
  padding: 8px 14px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-copy-url:hover {
  background: var(--accent-blue);
  color: #0f172a;
}

.ipad-url-alt {
  margin-top: 6px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.ipad-sync-banner {
  margin-top: 16px;
  padding: 10px 14px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--radius-sm);
  color: #6ee7b7;
  font-size: 0.8rem;
  line-height: 1.4;
}

/* Card Density & Layout Modifiers */
body.compact-grid .card-grid {
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}
body.compact-grid .card-thumbnail-wrap {
  height: 125px;
}
body.compact-grid .card-body {
  padding: 12px 14px;
}
body.compact-grid .card-title {
  font-size: 0.95rem;
  line-height: 1.3;
}
body.compact-grid .card-scene-title {
  font-size: 0.78rem;
  margin-bottom: 5px;
}
body.compact-grid .card-subtopic {
  font-size: 0.73rem;
  margin-bottom: 6px;
}

/* Hide Entity Pills Modifier */
body.hide-pills .card-pills-row {
  display: none !important;
}

/* Settings & Preferences Modal Styles */
.settings-modal-content {
  max-width: 680px;
  width: 94%;
  max-height: 88vh;
  display: flex;
  flex-direction: column;
}

.settings-modal-body {
  overflow-y: auto;
  padding: 4px 2px 16px 2px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.settings-section {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 20px;
}

.settings-section:last-child {
  border-bottom: none;
  padding-bottom: 4px;
}

.settings-section-header {
  margin-bottom: 14px;
}

.settings-section-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.settings-section-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Theme Picker Grid */
.theme-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

@media (max-width: 580px) {
  .theme-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.theme-card {
  background: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 10px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-align: center;
  transition: all 0.2s ease;
  position: relative;
}

.theme-card:hover {
  border-color: var(--accent-blue);
  transform: translateY(-2px);
}

.theme-card.active {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.35);
}

.theme-card.active::after {
  content: "✓";
  position: absolute;
  top: 6px;
  right: 6px;
  width: 18px;
  height: 18px;
  background: var(--accent-blue);
  color: #0f172a;
  border-radius: 50%;
  font-size: 0.72rem;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-swatch {
  width: 100%;
  height: 52px;
  border-radius: var(--radius-sm);
  padding: 6px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border: 1px solid rgba(255, 255, 255, 0.1);
  position: relative;
  overflow: hidden;
}

.swatch-header {
  height: 8px;
  border-radius: 3px;
  width: 60%;
}

.swatch-cards {
  display: flex;
  gap: 4px;
}

.swatch-mini-card {
  flex: 1;
  height: 20px;
  border-radius: 3px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.swatch-accent-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  position: absolute;
  bottom: 6px;
  right: 6px;
}

/* Palette Swatch Variations */
.swatch-midnight {
  background: #0f172a;
}
.swatch-midnight .swatch-header {
  background: #334155;
}
.swatch-midnight .swatch-mini-card {
  background: #1e293b;
}
.swatch-midnight .swatch-accent-dot {
  background: #38bdf8;
}

.swatch-oled {
  background: #000000;
  border-color: #262626;
}
.swatch-oled .swatch-header {
  background: #1a1a1a;
}
.swatch-oled .swatch-mini-card {
  background: #0c0d12;
}
.swatch-oled .swatch-accent-dot {
  background: #00d2ff;
}

.swatch-twilight {
  background: #120e24;
}
.swatch-twilight .swatch-header {
  background: #2e2456;
}
.swatch-twilight .swatch-mini-card {
  background: #1d1738;
}
.swatch-twilight .swatch-accent-dot {
  background: #e879f9;
}

.swatch-emerald {
  background: #061712;
}
.swatch-emerald .swatch-header {
  background: #153c32;
}
.swatch-emerald .swatch-mini-card {
  background: #0d2720;
}
.swatch-emerald .swatch-accent-dot {
  background: #10b981;
}

.swatch-sepia {
  background: #fcf4e4;
  border-color: #d6be92;
}
.swatch-sepia .swatch-header {
  background: #ebd7b5;
}
.swatch-sepia .swatch-mini-card {
  background: #fffaf0;
  border-color: #d6be92;
}
.swatch-sepia .swatch-accent-dot {
  background: #b45309;
}

.swatch-light {
  background: #f8fafc;
  border-color: #cbd5e1;
}
.swatch-light .swatch-header {
  background: #e2e8f0;
}
.swatch-light .swatch-mini-card {
  background: #ffffff;
  border-color: #cbd5e1;
}
.swatch-light .swatch-accent-dot {
  background: #0284c7;
}

.theme-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  align-items: center;
}

.theme-name {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text-primary);
}

.theme-badge {
  font-size: 0.68rem;
  color: var(--text-muted);
}

/* Settings Row */
.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 0;
}

.settings-row-text {
  flex: 1;
}

.settings-row-label {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.settings-row-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.35;
}

/* Speed Selector Group */
.speed-selector-group {
  display: inline-flex;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 3px;
  gap: 2px;
}

.speed-opt-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 5px 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.speed-opt-btn:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.speed-opt-btn.active {
  background: var(--accent-blue);
  color: #0f172a;
  font-weight: 700;
}

/* Modern iOS Style Toggle Switch */
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 46px;
  height: 26px;
  flex-shrink: 0;
}

.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: var(--bg-tertiary);
  transition: .25s;
  border-radius: 34px;
  border: 1px solid var(--border-color);
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .25s;
  border-radius: 50%;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.toggle-switch input:checked + .toggle-slider {
  background-color: var(--accent-blue);
  border-color: var(--accent-blue);
}

.toggle-switch input:checked + .toggle-slider:before {
  transform: translateX(20px);
  background-color: #0f172a;
}

/* Study Data & Backup Section */
.settings-data-stats {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
  padding: 8px 12px;
  background: var(--bg-primary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.settings-data-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn-data-action {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-data-action:hover {
  background: var(--border-color);
  border-color: var(--text-muted);
}

.btn-data-action.danger {
  color: var(--accent-rose);
  border-color: rgba(244, 63, 94, 0.3);
}

.btn-data-action.danger:hover {
  background: rgba(244, 63, 94, 0.15);
  border-color: var(--accent-rose);
}

/* Tablet & Mobile Viewports (iPad portrait 768px, 820px, 834px, up to 1024px) */
@media (max-width: 1024px) {
  .sidebar-toggle-btn {
    display: inline-flex;
  }

  .sidebar-close-btn {
    display: flex;
  }

  .sidebar-backdrop {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.75);
    backdrop-filter: blur(4px);
    z-index: 998;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
  }

  .sidebar-backdrop.open {
    opacity: 1;
    pointer-events: auto;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    height: 100vh;
    height: 100dvh;
    width: 320px;
    max-width: 85vw;
    z-index: 999;
    transform: translateX(-100%);
    transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 6px 0 30px rgba(0, 0, 0, 0.5);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .app-header {
    padding: 0 18px;
    gap: 12px;
  }

  .search-container {
    max-width: none;
  }

  .kbd-shortcut {
    display: none;
  }

  .search-clear-btn {
    right: 12px;
  }

  .catalog-container {
    padding: 18px 20px;
  }

  .card-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 18px;
  }

  .ipad-modal-body {
    flex-direction: column;
    align-items: center;
  }

  .ipad-qr-card {
    width: 100%;
    max-width: 320px;
  }
}

/* Touch Device Optimizations (iOS / iPadOS) */
@media (hover: none) and (pointer: coarse) {
  /* Apple HIG 44px minimum tap targets */
  .filter-btn {
    min-height: 44px;
    padding: 10px 14px;
  }

  .chip-filter {
    min-height: 38px;
    padding: 6px 14px;
    font-size: 0.85rem;
  }

  .btn-icon {
    min-height: 40px;
    padding: 8px 12px;
  }

  .btn-action-primary,
  .btn-play-inapp,
  .btn-view-pdf {
    min-height: 44px;
    font-size: 0.88rem;
  }

  .entity-pill {
    padding: 4px 10px;
    font-size: 0.76rem;
  }

  .modal-close-btn {
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  /* Safe Area Insets for iPad notched/home indicator screens */
  body {
    padding-top: env(safe-area-inset-top);
    padding-bottom: env(safe-area-inset-bottom);
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
  }

  .app-header {
    padding-top: max(0px, env(safe-area-inset-top));
  }

  .modal-content {
    padding-bottom: max(24px, env(safe-area-inset-bottom));
    -webkit-overflow-scrolling: touch;
  }

  .sidebar-scroll {
    -webkit-overflow-scrolling: touch;
  }

  /* Disable sticky hover transform on touch */
  .resource-card:hover {
    transform: none;
    box-shadow: none;
  }

  .resource-card:active {
    transform: scale(0.99);
  }
}

/* Mobile & Split View Screens (< 640px) */
@media (max-width: 640px) {
  .app-header {
    flex-wrap: wrap;
    height: auto;
    padding: 12px 14px;
  }

  .search-container {
    order: 2;
    width: 100%;
    margin-top: 6px;
  }

  .sidebar-toggle-text {
    display: none;
  }

  .view-toggle {
    display: none;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================
   Clinical White Theme Polishing & High-Contrast Adjustments
   ========================================================== */
[data-theme="light"] .context-bar {
  background-color: #ffffff;
  border-bottom: 1px solid #e2e8f0;
}

[data-theme="light"] .stats-summary {
  color: #475569;
}

[data-theme="light"] .stat-item strong {
  color: #0f172a;
}

[data-theme="light"] .progress-pill {
  background: #f1f5f9;
  border-color: #e2e8f0;
  color: #334155;
}

[data-theme="light"] .progress-track {
  background-color: #cbd5e1;
}

[data-theme="light"] .progress-fill {
  background: linear-gradient(90deg, #059669, #0284c7);
}

[data-theme="light"] .offline-pill {
  background: rgba(5, 150, 105, 0.1);
  border-color: rgba(5, 150, 105, 0.25);
  color: #059669;
}

[data-theme="light"] .chip-filter {
  background: #f8fafc;
  border-color: #cbd5e1;
  color: #334155;
}

[data-theme="light"] .chip-filter:hover {
  background: #ffffff;
  border-color: #94a3b8;
  color: #0f172a;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .chip-filter.active {
  background: rgba(2, 132, 199, 0.12);
  border-color: #0284c7;
  color: #0284c7;
  font-weight: 700;
}

[data-theme="light"] .filter-badge {
  background-color: #f1f5f9;
  border: 1px solid #e2e8f0;
  color: #64748b;
}

[data-theme="light"] .filter-btn.active {
  background-color: rgba(2, 132, 199, 0.08);
  border-color: rgba(2, 132, 199, 0.28);
  color: #0284c7;
}

[data-theme="light"] .filter-btn.active .filter-badge {
  background-color: #0284c7;
  border-color: #0284c7;
  color: #ffffff !important;
  box-shadow: 0 1px 4px rgba(2, 132, 199, 0.25);
}

[data-theme="light"] .card-thumbnail-wrap {
  background-color: #f1f5f9;
}

[data-theme="light"] .media-badge {
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: #0f172a !important;
  border: 1px solid rgba(15, 23, 42, 0.15);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.08);
  font-weight: 600;
}

[data-theme="light"] .size-badge {
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: #334155 !important;
  border: 1px solid rgba(15, 23, 42, 0.15);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.08);
  font-weight: 600;
}

[data-theme="light"] .duration-badge {
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: #0284c7;
  border: 1px solid rgba(2, 132, 199, 0.25);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.08);
  font-weight: 700;
}

[data-theme="light"] .entity-pill {
  color: #0284c7;
  background: rgba(2, 132, 199, 0.08);
  border-color: rgba(2, 132, 199, 0.22);
  font-weight: 600;
}

[data-theme="light"] .entity-pill:hover {
  background: rgba(2, 132, 199, 0.18);
  border-color: #0284c7;
}

[data-theme="light"] .card-scene-title {
  color: #7e22ce;
  font-weight: 600;
}

[data-theme="light"] .card-subtopic {
  color: #64748b;
}

[data-theme="light"] .resource-card {
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.03);
}

[data-theme="light"] .resource-card:hover {
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
  border-color: #cbd5e1;
}

[data-theme="light"] .deep-concepts-box {
  background: #f8fafc;
  border-color: #e2e8f0;
}