/* ============================================
   COMPONENTS: Tab container, video, nav, cards
   Guitar Club - Student Materials
   ============================================ */

/* ============================================
   TAB CONTAINER: Gemini-style with header + copy
   ============================================ */

.tab-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md, 12px);
  overflow: hidden;
  margin-top: var(--space-md);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.tab-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border);
}

.tab-title {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 600;
}

.copy-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 12px;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all 0.2s;
}

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

.copy-btn.copied {
  background: rgba(63, 185, 80, 0.15);
  border-color: transparent;
  color: var(--accent-green);
}

.tab-content {
  overflow-x: auto;
  padding: 24px;
}

/* Tab content (pre element) */
pre.tab {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-primary);
  margin: 0;
  white-space: pre;
  tab-size: 4;
  -moz-tab-size: 4;
}

/* Note text above tabs */
p.note {
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  font-size: 15px;
}


/* ============================================
   VIDEO: Centered, lazy-loadable, with pop-out
   ============================================ */

.video-container {
  max-width: 640px;
  max-height: var(--video-max-height);
  margin: 0 auto var(--space-xl) auto;
  position: relative;
  background: #000;
  border-radius: 8px;
  overflow: hidden;
  aspect-ratio: 16 / 9;
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* Thumbnail placeholder */
.video-thumbnail {
  width: 100%;
  height: 100%;
  object-fit: cover;
  cursor: pointer;
  transition: opacity 0.2s;
}

.video-thumbnail:hover {
  opacity: 0.9;
}

/* Play button overlay */
.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 68px;
  height: 48px;
  background: rgba(0, 0, 0, 0.8);
  border-radius: 12px;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-play-btn::after {
  content: '';
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent white;
}

.video-container:hover .video-play-btn {
  background: #ff0000;
}

/* Pop-out button */
.video-popout-btn {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  background: rgba(0, 0, 0, 0.7);
  border: none;
  color: white;
  padding: var(--space-xs) var(--space-sm);
  border-radius: 4px;
  font-size: 12px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.2s;
  z-index: 5;
}

.video-container:hover .video-popout-btn {
  opacity: 1;
}

.video-popout-btn:hover {
  background: rgba(0, 0, 0, 0.9);
}

/* ============================================
   SECTION NAV: Gemini-style floating pill nav
   ============================================ */

.sticky-nav-container {
  position: sticky;
  top: 20px;
  z-index: 100;
  margin-bottom: 40px;
  display: flex;
  justify-content: center;
}

.section-nav {
  background: rgba(22, 27, 34, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 6px;
  border-radius: 100px;
  border: 1px solid var(--border);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  justify-content: center;
}

.section-nav a {
  padding: 8px 20px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

.section-nav a:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
  text-decoration: none;
}

.section-nav a.active {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 10px rgba(88, 166, 255, 0.3);
}


/* ============================================
   HUB PAGE: Song grid, chords, tips
   ============================================ */

/* Song Grid */
.song-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.song-card {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 16px;
  padding: 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.2s, transform 0.2s;
}

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

/* Video Preview Thumbnail */
.video-preview {
  aspect-ratio: 16/9;
  border-radius: 8px;
  overflow: hidden;
  background: #000;
  position: relative;
  cursor: pointer;
}

.preview-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity 0.2s;
}

.video-preview:hover .preview-thumb {
  opacity: 0.7;
}

.preview-play {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 40px;
  height: 40px;
  background: rgba(0, 0, 0, 0.7);
  border: none;
  border-radius: 50%;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}

.preview-play svg {
  width: 16px;
  height: 16px;
  margin-left: 2px;
}

.video-preview:hover .preview-play {
  background: var(--accent);
  transform: translate(-50%, -50%) scale(1.1);
}

/* Song Info */
.song-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.song-info .song-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.song-info .song-artist {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

/* Chips */
.song-chips {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: auto;
}

.chip {
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

/* Song Actions */
.song-actions {
  margin-top: 10px;
}

.btn-open {
  display: inline-block;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 6px;
  text-decoration: none;
  transition: all 0.2s;
}

.btn-open:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  text-decoration: none;
}

/* Panel wrapper for sections */
.panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}

/* Chord row */
.chord-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.chord-item {
  background: var(--bg-secondary);
  padding: 12px 16px;
  border-radius: 6px;
  text-align: center;
  border: 1px solid var(--border);
  min-width: 80px;
}

.chord-name {
  font-weight: 600;
  color: var(--accent-orange);
  margin-bottom: 4px;
}

/* jTab chord diagrams */
.jtab {
  min-height: 118px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.jtab svg {
  display: block;
}

/* jTab overrides */
.jtab svg text {
  fill: var(--text-primary) !important;
}

.jtab svg path,
.jtab svg line,
.jtab svg rect {
  stroke: var(--text-secondary) !important;
}

.jtab svg circle {
  fill: var(--accent) !important;
  stroke: var(--accent) !important;
}

/* Tips Grid */
.tips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 12px;
}

.tip-card {
  padding: 14px 16px;
  background: var(--bg-secondary);
  border-radius: 10px;
  border-left: 3px solid var(--accent-green);
  font-size: 14px;
  line-height: 1.5;
}

.tip-card strong {
  color: var(--accent-green);
}

/* Legacy tips list (kept for compatibility) */
.tips-list {
  list-style: none;
}

.tips-list li {
  padding: 10px 12px;
  background: var(--bg-secondary);
  border-radius: 6px;
  margin-bottom: 6px;
  border-left: 3px solid var(--accent-green);
  font-size: 14px;
  line-height: 1.5;
}

.tips-list li strong {
  color: var(--accent-green);
}

/* ============================================
   SPECIAL COMPONENTS: Capo warning, strum, etc.
   ============================================ */

/* Capo warning */
.capo-warning {
  background: #3d2a00;
  border: 1px solid #f0883e;
  border-radius: 6px;
  padding: 10px 14px;
  margin-bottom: var(--space-md);
  color: #f0883e;
  font-size: 14px;
}

/* Strum pattern */
.strum-pattern {
  display: flex;
  align-items: flex-end;
  gap: var(--space-md);
  font-size: 20px;
  background: var(--bg-secondary);
  padding: var(--space-md);
  border-radius: 6px;
  border: 1px solid var(--border);
}

.strum-beat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}

.strum-arrow {
  color: var(--accent);
  font-size: 24px;
}

.strum-count {
  font-size: 14px;
  color: var(--text-secondary);
}

.strum-miss {
  color: var(--border);
}

/* Song structure */
.structure {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.structure strong {
  color: var(--accent);
}

.structure p {
  margin-bottom: var(--space-xs);
}

/* Legend for tab notation */
.legend {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-secondary);
  border-radius: 6px;
  border: 1px solid var(--border);
}

.legend code {
  color: var(--accent-orange);
  margin-right: var(--space-md);
  font-family: var(--font-mono);
}

/* ============================================
   VIDEO MODAL: Lightbox for hub previews
   ============================================ */

.video-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 1000;
}

.video-modal.active {
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.modal-content {
  position: relative;
  width: 90%;
  max-width: 900px;
  z-index: 1;
}

.modal-close {
  position: absolute;
  top: -40px;
  right: 0;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 32px;
  cursor: pointer;
  padding: 4px 12px;
  line-height: 1;
  transition: color 0.2s;
}

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

.modal-video {
  aspect-ratio: 16/9;
  background: #000;
  border-radius: 12px;
  overflow: hidden;
}

.modal-video iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.modal-open-link {
  display: inline-block;
  margin-top: 16px;
  padding: 10px 20px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s;
}

.modal-open-link:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  text-decoration: none;
}

/* ============================================
   APP SIDEBAR: Main navigation (from guitar-quest)
   ============================================ */

.app-sidebar {
  width: 240px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  height: 100vh;
  position: fixed;
  left: 0;
  top: 0;
  z-index: 100;
}

/* User Profile */
.sidebar-profile {
  padding: 24px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border);
}

.profile-icon {
  width: 40px;
  height: 40px;
  background: var(--accent);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #000;
}

.profile-icon svg {
  width: 22px;
  height: 22px;
}

.profile-info {
  flex: 1;
}

.profile-name {
  font-weight: 700;
  font-size: 16px;
  color: var(--text-primary);
  line-height: 1.2;
}

.profile-rank {
  font-size: 12px;
  color: var(--accent-green);
  font-weight: 600;
  margin-top: 2px;
}

/* Navigation Items */
.sidebar-nav {
  flex: 1;
  padding: 16px 12px;
  overflow-y: auto;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 12px 16px;
  border: none;
  background: transparent;
  border-radius: 10px;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  margin-bottom: 4px;
}

.nav-item:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  text-decoration: none;
}

.nav-item.active {
  background: var(--accent);
  color: #000;
  font-weight: 600;
}

.nav-item svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

/* Sidebar Footer */
.sidebar-footer {
  padding: 16px 12px;
  border-top: 1px solid var(--border);
}

.btn-design-mode {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 8px;
}

.btn-design-mode:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-design-mode svg {
  width: 16px;
  height: 16px;
}

.btn-logout {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 12px 16px;
  background: transparent;
  border: none;
  border-radius: 10px;
  color: #f85149;
  font-size: 13px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-logout:hover {
  background: rgba(248, 81, 73, 0.1);
}

.btn-logout svg {
  width: 16px;
  height: 16px;
}

/* Content offset for fixed sidebar */
body.has-app-sidebar {
  padding-left: 264px; /* sidebar width (240px) + gap (24px) */
}

body.has-app-sidebar .page.hub {
  padding-left: var(--space-lg, 24px);
  padding-right: var(--space-lg, 24px);
}

/* Mobile sidebar toggle */
.sidebar-toggle {
  display: none;
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 101;
  width: 44px;
  height: 44px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-primary);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.sidebar-toggle svg {
  width: 24px;
  height: 24px;
}

/* Mobile responsive */
@media (max-width: 768px) {
  .app-sidebar {
    transform: translateX(-100%);
    transition: transform 0.3s ease;
  }

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

  .sidebar-toggle {
    display: flex;
  }

  body.has-app-sidebar {
    padding-left: 0;
  }

  body.has-app-sidebar .page.hub {
    padding-left: var(--space-md, 16px);
    padding-right: var(--space-md, 16px);
  }

  body.sidebar-open::before {
    content: '';
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
  }
}

/* ============================================
   LEARN SIDEBAR: Module list (legacy)
   ============================================ */

.sidebar.learn-sidebar {
  width: 220px;
  flex-shrink: 0;
  padding: 20px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  height: fit-content;
  position: sticky;
  top: 24px;
}

.sidebar.learn-sidebar h3 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.learn-nav details {
  margin-bottom: 4px;
}

.learn-nav summary {
  list-style: none;
  cursor: pointer;
  padding: 10px 12px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  transition: background 0.2s;
  display: flex;
  align-items: center;
  gap: 8px;
}

.learn-nav summary::-webkit-details-marker {
  display: none;
}

.learn-nav summary::before {
  content: '▸';
  font-size: 10px;
  color: var(--text-muted);
  transition: transform 0.2s;
}

.learn-nav details[open] summary::before {
  transform: rotate(90deg);
}

.learn-nav summary:hover {
  background: var(--bg-tertiary);
}

.learn-nav summary .external-link {
  margin-left: auto;
  color: var(--text-muted);
  font-size: 12px;
  text-decoration: none;
}

.learn-nav summary .external-link:hover {
  color: var(--accent);
}

.learn-nav ul {
  list-style: none;
  margin: 4px 0 8px 20px;
  padding-left: 12px;
  border-left: 1px solid var(--border);
}

.learn-nav li {
  padding: 6px 8px;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.4;
}

.main-content {
  flex: 1;
  min-width: 0;
}

@media (max-width: 768px) {
  .page.hub {
    flex-direction: column;
  }
  
  .sidebar {
    width: 100%;
    padding: 16px;
    background: var(--bg-secondary);
    border-radius: 12px;
    margin-bottom: 24px;
  }
}

/* ============================================
   LEARN CARDS: JustinGuitar module links
   ============================================ */

.learn-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}

.learn-card {
  display: block;
  padding: 20px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-decoration: none;
  transition: all 0.2s;
}

.learn-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  text-decoration: none;
}

.learn-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.learn-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ============================================
   RESPONSIVE: Hub cards + modal
   ============================================ */

@media (max-width: 600px) {
  .song-grid {
    grid-template-columns: 1fr;
  }

  .song-card {
    grid-template-columns: 100px 1fr;
    gap: 12px;
    padding: 12px;
  }

  .preview-play {
    width: 32px;
    height: 32px;
  }

  .preview-play svg {
    width: 12px;
    height: 12px;
  }

  .modal-content {
    width: 95%;
  }

  .modal-close {
    top: -36px;
    font-size: 28px;
  }
}