/* ============================================================
   ONIXTUBE - Frontend Stylesheet
   Dark Video Platform Theme
   ============================================================ */

/* ------------------------------------------------------------
   1. CSS Reset / Base Styles
   ------------------------------------------------------------ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', 'Segoe UI', Roboto, -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--accent-light);
}

img {
  max-width: 100%;
  display: block;
}

ul, ol {
  list-style: none;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  border: none;
  outline: none;
  background: none;
}

button {
  cursor: pointer;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1rem; }

/* ------------------------------------------------------------
   2. CSS Custom Properties
   ------------------------------------------------------------ */
:root {
  /* Accent */
  --accent: #e94560;
  --accent-light: #ff6b81;
  --accent-dark: #c73650;
  --accent-glow: rgba(233, 69, 96, 0.25);

  /* Backgrounds */
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: #16213e;
  --bg-input: #0f3460;
  --bg-overlay: rgba(15, 15, 26, 0.85);
  --bg-hover: rgba(233, 69, 96, 0.08);

  /* Text */
  --text-primary: #ffffff;
  --text-secondary: #cccccc;
  --text-muted: #888888;
  --text-link: #e94560;

  /* Borders */
  --border-light: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.15);
  --border-accent: rgba(233, 69, 96, 0.4);

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px var(--accent-glow);

  /* Sidebar */
  --sidebar-width-open: 250px;
  --sidebar-width-closed: 0px;

  /* Topbar */
  --topbar-height: 60px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Spacing */
  --gap-xs: 4px;
  --gap-sm: 8px;
  --gap-md: 16px;
  --gap-lg: 24px;
  --gap-xl: 32px;
  --gap-2xl: 48px;
}

/* ------------------------------------------------------------
   3. Scrollbar Styling
   ------------------------------------------------------------ */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--bg-card);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-dark);
}

/* Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--bg-card) var(--bg-primary);
}

/* ------------------------------------------------------------
   4. Top Navbar
   ------------------------------------------------------------ */
.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--topbar-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--gap-md);
  z-index: 1000;
  backdrop-filter: blur(12px);
}

.topbar-logo {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
}

.topbar-logo img {
  height: 32px;
  width: auto;
}

.topbar-logo span {
  color: var(--accent);
}

.topbar-center {
  flex: 1;
  max-width: 600px;
  margin: 0 var(--gap-lg);
  position: relative;
}

.search-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
}

.search-input {
  width: 100%;
  height: 40px;
  padding: 0 var(--gap-md);
  padding-right: 44px;
  background: var(--bg-input);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
  color: var(--text-primary);
  font-size: 0.875rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-input:focus {
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-btn {
  height: 40px;
  width: 44px;
  background: var(--accent);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast);
}

.search-btn:hover {
  background: var(--accent-light);
}

.search-suggestions {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  overflow: hidden;
  z-index: 1100;
  display: none;
  box-shadow: var(--shadow-lg);
}

.search-suggestions.active {
  display: block;
}

.search-suggestion-item {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
  padding: var(--gap-sm) var(--gap-md);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.search-suggestion-item:hover {
  background: var(--bg-hover);
}

.search-suggestion-item .suggestion-icon {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.search-suggestion-item .suggestion-text {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: var(--gap-md);
}

.sidebar-toggle-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 1.25rem;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.sidebar-toggle-btn:hover {
  background: var(--bg-hover);
  color: var(--accent);
}

.user-dropdown-wrapper {
  position: relative;
}

.user-avatar-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.875rem;
  overflow: hidden;
  transition: box-shadow var(--transition-fast);
}

.user-avatar-btn:hover {
  box-shadow: var(--shadow-glow);
}

.user-avatar-btn img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.user-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 220px;
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  display: none;
  z-index: 1100;
}

.user-dropdown.active {
  display: block;
}

.user-dropdown-header {
  padding: var(--gap-md);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
}

.user-dropdown-header .user-name {
  font-weight: 600;
  color: var(--text-primary);
}

.user-dropdown-header .user-email {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.user-dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
  padding: var(--gap-sm) var(--gap-md);
  color: var(--text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.user-dropdown-item:hover {
  background: var(--bg-hover);
  color: var(--accent);
}

.user-dropdown-item .dropdown-icon {
  width: 20px;
  text-align: center;
  font-size: 0.875rem;
}

.user-dropdown-divider {
  height: 1px;
  background: var(--border-light);
  margin: var(--gap-xs) 0;
}

/* ------------------------------------------------------------
   5. Sidebar
   ------------------------------------------------------------ */
.sidebar {
  position: fixed;
  top: var(--topbar-height);
  left: 0;
  bottom: 0;
  width: var(--sidebar-width-open);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-light);
  overflow-y: auto;
  overflow-x: hidden;
  z-index: 900;
  transition: transform var(--transition-normal), width var(--transition-normal);
  padding-top: var(--gap-sm);
}

.sidebar.sidebar-closed {
  transform: translateX(-100%);
}

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

.sidebar-nav {
  padding: var(--gap-sm) 0;
}

.sidebar-nav-section {
  margin-bottom: var(--gap-md);
}

.sidebar-nav-section-title {
  padding: var(--gap-sm) var(--gap-lg);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sidebar-nav-item {
  display: flex;
  align-items: center;
  gap: var(--gap-md);
  padding: var(--gap-sm) var(--gap-lg);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  margin: 2px var(--gap-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.sidebar-nav-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.sidebar-nav-item.active {
  background: var(--accent-glow);
  color: var(--accent);
}

.sidebar-nav-item.active .nav-icon {
  color: var(--accent);
}

.sidebar-nav-item .nav-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.sidebar-nav-item:hover .nav-icon {
  color: var(--text-primary);
}

.sidebar-nav-item .nav-label {
  font-size: 0.875rem;
  white-space: nowrap;
}

.sidebar-nav-item .nav-badge {
  margin-left: auto;
  padding: 2px 8px;
  background: var(--accent);
  color: var(--text-primary);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
}

/* ------------------------------------------------------------
   6. Main Content Area
   ------------------------------------------------------------ */
.main-content {
  margin-top: var(--topbar-height);
  margin-left: var(--sidebar-width-open);
  padding: var(--gap-lg);
  min-height: calc(100vh - var(--topbar-height));
  transition: margin-left var(--transition-normal);
}

.main-content.sidebar-closed {
  margin-left: 0;
}

.main-content.sidebar-open {
  margin-left: var(--sidebar-width-open);
}

/* ------------------------------------------------------------
   7. Video Grid
   ------------------------------------------------------------ */
.video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap-lg);
}

@media (max-width: 1100px) {
  .video-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .video-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--gap-md);
  }
}

@media (max-width: 480px) {
  .video-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }
  /* Compact video cards on mobile (YouTube app style) */
  .video-card-info {
    padding: 8px 4px;
    gap: 6px;
  }
  .video-channel-logo {
    width: 24px;
    height: 24px;
  }
  .video-card-title {
    font-size: 12px;
    -webkit-line-clamp: 2;
  }
  .video-card-channel {
    font-size: 11px;
  }
  .video-card-stats {
    font-size: 11px;
  }
  .video-duration {
    font-size: 10px;
    padding: 1px 4px;
    bottom: 4px;
    right: 4px;
  }
}

/* ------------------------------------------------------------
   8. Video Card (Unified - matches templates/video_card.php)
   ------------------------------------------------------------ */
.video-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.video-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

/* Thumbnail Link */
.video-card-thumb {
  position: relative;
  display: block;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--bg-input);
}

.video-thumb-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.video-card:hover .video-thumb-img {
  transform: scale(1.05);
}

/* Play overlay on hover */
.video-thumb-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.video-card:hover .video-thumb-overlay {
  opacity: 1;
}

/* Duration badge */
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0, 0, 0, 0.8);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 4px;
}

/* Info Section (channel logo + meta) */
.video-card-info {
  padding: 12px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.video-channel-logo-link {
  flex-shrink: 0;
}

.video-channel-logo {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
}

/* Meta: title, channel name, stats */
.video-card-meta {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.video-card-title {
  display: -webkit-box;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
  max-height: 2.8em;
  overflow: hidden;
  text-overflow: ellipsis;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  word-break: break-word;
  transition: color 0.2s ease;
  text-decoration: none;
}

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

.video-card-channel {
  display: block;
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
  transition: color 0.2s ease;
  text-decoration: none;
}

.video-card-channel:hover {
  color: var(--text-primary);
}

.video-card-stats {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

.video-dot {
  font-size: 10px;
}

.video-views,
.video-time {
  display: inline;
}

/* Legacy fallback classes (for compatibility with main.js buildVideoCardHtml) */
.video-card-body {
  padding: 12px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.video-card-channel .channel-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.625rem;
  color: var(--text-primary);
  font-weight: 600;
  flex-shrink: 0;
}
.video-card-channel .channel-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.video-card-channel .channel-name {
  font-size: 12px;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}
.video-card-channel .channel-name:hover {
  color: var(--accent);
}
.video-card-meta .meta-separator {
  opacity: 0.5;
}

/* ------------------------------------------------------------
   9. Video Player Page
   ------------------------------------------------------------ */
.video-player-layout {
  display: grid;
  grid-template-columns: 7fr 3fr;
  gap: var(--gap-lg);
  align-items: start;
}

@media (max-width: 768px) {
  .video-player-layout {
    grid-template-columns: 1fr;
  }
}

.video-player-main {
  /* Main video area */
}

.video-embed-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: var(--gap-lg);
}

.video-embed-wrapper iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

.video-info-section {
  margin-bottom: var(--gap-lg);
}

.video-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--gap-sm);
  line-height: 1.4;
}

.video-stats-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--gap-md);
  padding: var(--gap-md) 0;
  border-bottom: 1px solid var(--border-light);
}

.video-stats-left {
  display: flex;
  align-items: center;
  gap: var(--gap-md);
  font-size: 0.875rem;
  color: var(--text-muted);
}

.video-stats-right {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
}

.video-action-btn {
  display: flex;
  align-items: center;
  gap: var(--gap-xs);
  padding: var(--gap-sm) var(--gap-md);
  background: var(--bg-input);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.video-action-btn:hover {
  background: var(--accent-glow);
  color: var(--accent);
}

.video-action-btn.liked {
  color: var(--accent);
  background: var(--accent-glow);
}

.video-channel-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--gap-md) 0;
  border-bottom: 1px solid var(--border-light);
}

.video-channel-info {
  display: flex;
  align-items: center;
  gap: var(--gap-md);
}

.video-channel-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--accent-dark);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--text-primary);
  font-weight: 600;
}

.video-channel-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-channel-name {
  font-weight: 600;
  color: var(--text-primary);
}

.video-channel-subs {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.subscribe-btn {
  padding: var(--gap-sm) var(--gap-lg);
  background: var(--accent);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.875rem;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.subscribe-btn:hover {
  background: var(--accent-light);
  transform: scale(1.05);
}

.subscribe-btn.subscribed {
  background: var(--bg-input);
  color: var(--text-secondary);
}

.video-description {
  padding: var(--gap-md) 0;
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.video-description.collapsed {
  max-height: 80px;
  overflow: hidden;
  position: relative;
}

.video-description.collapsed::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 40px;
  background: linear-gradient(transparent, var(--bg-card));
}

.show-more-btn {
  color: var(--text-muted);
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.show-more-btn:hover {
  color: var(--accent);
}

/* Save to Playlist Dropdown */
.save-playlist-wrapper {
  position: relative;
}

.save-playlist-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 260px;
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  display: none;
  z-index: 1100;
}

.save-playlist-dropdown.active {
  display: block;
}

.save-playlist-dropdown .playlist-list {
  padding: var(--gap-sm);
}

.save-playlist-dropdown .playlist-item {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
  padding: var(--gap-sm);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.save-playlist-dropdown .playlist-item:hover {
  background: var(--bg-hover);
}

.save-playlist-dropdown .create-playlist-input {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
  padding: var(--gap-sm);
  border-top: 1px solid var(--border-light);
}

.save-playlist-dropdown .create-playlist-input input {
  flex: 1;
  padding: var(--gap-sm);
  background: var(--bg-input);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
}

.save-playlist-dropdown .create-playlist-btn {
  padding: var(--gap-sm);
  background: var(--accent);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-weight: 600;
}

/* ------------------------------------------------------------
   10. Related Video Sidebar
   ------------------------------------------------------------ */
.video-player-sidebar {
  /* Right sidebar on video page */
}

.related-videos-header {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--gap-md);
}

.related-video-list {
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

.related-video-item {
  display: flex;
  gap: var(--gap-sm);
  padding: var(--gap-sm);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
  cursor: pointer;
}

.related-video-item:hover {
  background: var(--bg-hover);
}

.related-video-item .related-thumb {
  width: 168px;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-input);
  flex-shrink: 0;
}

.related-video-item .related-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.related-video-item .related-info {
  flex: 1;
  min-width: 0;
}

.related-video-item .related-title {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: var(--gap-xs);
}

.related-video-item .related-channel {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.related-video-item .related-stats {
  font-size: 0.75rem;
  color: var(--text-muted);
}

@media (max-width: 768px) {
  .related-video-item .related-thumb {
    width: 120px;
  }
}

/* ------------------------------------------------------------
   11. Playlist Page
   ------------------------------------------------------------ */
.playlist-page-section {
  margin-bottom: var(--gap-xl);
}

.playlist-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--gap-md);
}

.playlist-section-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
}

.playlist-section-count {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.playlist-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap-md);
}

@media (max-width: 1100px) {
  .playlist-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .playlist-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .playlist-grid {
    grid-template-columns: 1fr;
  }
}

.playlist-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  cursor: pointer;
}

.playlist-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.playlist-card-thumb {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--bg-input);
}

.playlist-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.playlist-card-thumb .playlist-count-badge {
  position: absolute;
  bottom: 0;
  right: 0;
  padding: var(--gap-sm);
  background: rgba(0, 0, 0, 0.85);
  color: var(--text-primary);
  font-size: 0.8125rem;
  font-weight: 600;
}

.playlist-card-body {
  padding: var(--gap-md);
}

.playlist-card-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--gap-xs);
}

.playlist-card-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ------------------------------------------------------------
   12. Subscription Page
   ------------------------------------------------------------ */
.subscription-page {
  /* Subscription page layout */
}

.subscribed-channels-row {
  display: flex;
  gap: var(--gap-md);
  padding: var(--gap-md) 0;
  overflow-x: auto;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.subscribed-channels-row::-webkit-scrollbar {
  display: none;
}

.channel-scroll-container {
  position: relative;
  margin-bottom: var(--gap-lg);
}

.channel-scroll-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: 50%;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  z-index: 10;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.channel-scroll-btn:hover {
  background: var(--accent);
  color: var(--text-primary);
}

.channel-scroll-btn.scroll-left {
  left: -20px;
}

.channel-scroll-btn.scroll-right {
  right: -20px;
}

.subscribed-channel-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--gap-sm);
  min-width: 100px;
  padding: var(--gap-md);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.subscribed-channel-card:hover {
  background: var(--bg-hover);
  transform: translateY(-2px);
}

.subscribed-channel-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--accent-dark);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--text-primary);
  font-weight: 600;
}

.subscribed-channel-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.subscribed-channel-name {
  font-size: 0.8125rem;
  color: var(--text-primary);
  font-weight: 500;
  text-align: center;
  max-width: 100px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.subscription-video-grid {
  margin-top: var(--gap-lg);
}

.subscription-video-grid .video-grid {
  grid-template-columns: repeat(4, 1fr);
}

/* ------------------------------------------------------------
   13. Search Page
   ------------------------------------------------------------ */
.search-page-header {
  margin-bottom: var(--gap-lg);
}

.search-page-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.search-page-title .search-query {
  color: var(--accent);
}

.search-result-meta {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: var(--gap-md);
}

.search-results-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap-lg);
}

@media (max-width: 1100px) {
  .search-results-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .search-results-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .search-results-grid {
    grid-template-columns: 1fr;
  }
}

/* ------------------------------------------------------------
   14. Channel Page
   ------------------------------------------------------------ */
.channel-header {
  display: flex;
  align-items: center;
  gap: var(--gap-lg);
  padding: var(--gap-xl) 0;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: var(--gap-lg);
}

.channel-header-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--accent-dark);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--text-primary);
  font-weight: 700;
  border: 3px solid var(--accent);
}

.channel-header-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.channel-header-info {
  flex: 1;
}

.channel-header-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--gap-xs);
}

.channel-header-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--gap-sm);
}

.channel-header-stats {
  display: flex;
  gap: var(--gap-md);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.channel-tabs {
  display: flex;
  gap: var(--gap-md);
  padding: var(--gap-md) 0;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: var(--gap-lg);
}

.channel-tab {
  padding: var(--gap-sm) var(--gap-md);
  color: var(--text-muted);
  font-weight: 500;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.channel-tab:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.channel-tab.active {
  color: var(--accent);
  border-bottom: 2px solid var(--accent);
}

/* ------------------------------------------------------------
   15. Forms
   ------------------------------------------------------------ */
.form-group {
  margin-bottom: var(--gap-md);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--gap-sm);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--gap-sm) var(--gap-md);
  background: var(--bg-input);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.875rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-muted);
}

.form-select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23888' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-error {
  font-size: 0.75rem;
  color: var(--accent);
  margin-top: var(--gap-xs);
}

.form-row {
  display: flex;
  gap: var(--gap-md);
}

.form-row .form-group {
  flex: 1;
}

@media (max-width: 480px) {
  .form-row {
    flex-direction: column;
  }
}

/* ------------------------------------------------------------
   16. Buttons
   ------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--gap-sm);
  padding: var(--gap-sm) var(--gap-lg);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.875rem;
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--accent);
  color: var(--text-primary);
}

.btn-primary:hover {
  background: var(--accent-light);
  box-shadow: var(--shadow-glow);
}

.btn-secondary {
  background: var(--bg-input);
  color: var(--text-secondary);
  border: 1px solid var(--border-light);
}

.btn-secondary:hover {
  background: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.btn-danger {
  background: #dc3545;
  color: var(--text-primary);
}

.btn-danger:hover {
  background: #c82333;
}

.btn-success {
  background: #28a745;
  color: var(--text-primary);
}

.btn-success:hover {
  background: #218838;
}

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}

.btn-outline:hover {
  background: var(--accent-glow);
}

.btn-sm {
  padding: var(--gap-xs) var(--gap-sm);
  font-size: 0.75rem;
}

.btn-lg {
  padding: var(--gap-md) var(--gap-xl);
  font-size: 1rem;
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-md);
}

/* ------------------------------------------------------------
   17. Custom Checkbox / Radio
   ------------------------------------------------------------ */
.custom-checkbox,
.custom-radio {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--text-secondary);
  position: relative;
}

.custom-checkbox input,
.custom-radio input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.custom-checkbox .checkmark {
  width: 18px;
  height: 18px;
  background: var(--bg-input);
  border: 2px solid var(--border-medium);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast), border-color var(--transition-fast);
  flex-shrink: 0;
}

.custom-checkbox input:checked + .checkmark {
  background: var(--accent);
  border-color: var(--accent);
}

.custom-checkbox input:checked + .checkmark::after {
  content: '';
  width: 6px;
  height: 10px;
  border: solid var(--text-primary);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
  margin-top: -2px;
}

.custom-radio .radiomark {
  width: 18px;
  height: 18px;
  background: var(--bg-input);
  border: 2px solid var(--border-medium);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast), border-color var(--transition-fast);
  flex-shrink: 0;
}

.custom-radio input:checked + .radiomark {
  border-color: var(--accent);
}

.custom-radio input:checked + .radiomark::after {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
}

.custom-checkbox:hover .checkmark,
.custom-radio:hover .radiomark {
  border-color: var(--accent);
}

/* ------------------------------------------------------------
   18. Toast Notifications
   ------------------------------------------------------------ */
.toast-container {
  position: fixed;
  bottom: var(--gap-lg);
  right: var(--gap-lg);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--gap-md);
  padding: var(--gap-md) var(--gap-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 280px;
  max-width: 400px;
  pointer-events: auto;
  animation: toastSlideIn var(--transition-normal) ease forwards;
}

.toast.toast-removing {
  animation: toastSlideOut var(--transition-normal) ease forwards;
}

.toast-success {
  border-left: 4px solid #28a745;
}

.toast-error {
  border-left: 4px solid var(--accent);
}

.toast-info {
  border-left: 4px solid #17a2b8;
}

.toast-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
}

.toast-success .toast-icon { color: #28a745; }
.toast-error .toast-icon { color: var(--accent); }
.toast-info .toast-icon { color: #17a2b8; }

.toast-message {
  font-size: 0.875rem;
  color: var(--text-secondary);
  flex: 1;
}

@keyframes toastSlideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes toastSlideOut {
  from {
    transform: translateX(0);
    opacity: 1;
  }
  to {
    transform: translateX(100%);
    opacity: 0;
  }
}

/* ------------------------------------------------------------
   19. Loading Spinner
   ------------------------------------------------------------ */
.spinner {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.spinner-circle {
  width: 24px;
  height: 24px;
  border: 3px solid var(--border-light);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spinRotate 0.8s linear infinite;
}

.spinner-lg .spinner-circle {
  width: 40px;
  height: 40px;
  border-width: 4px;
}

.spinner-sm .spinner-circle {
  width: 16px;
  height: 16px;
  border-width: 2px;
}

@keyframes spinRotate {
  to { transform: rotate(360deg); }
}

.loading-overlay {
  position: absolute;
  inset: 0;
  background: var(--bg-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.loading-text {
  margin-top: var(--gap-md);
  font-size: 0.875rem;
  color: var(--text-muted);
}

.load-more-sentinel {
  text-align: center;
  padding: var(--gap-lg);
  color: var(--text-muted);
  font-size: 0.875rem;
}

.load-more-sentinel .spinner {
  margin-bottom: var(--gap-sm);
}

.all-loaded-message {
  text-align: center;
  padding: var(--gap-lg);
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* ------------------------------------------------------------
   20. Modal / Overlay
   ------------------------------------------------------------ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1500;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  width: 90%;
  max-width: 500px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transform: scale(0.9) translateY(20px);
  transition: transform var(--transition-normal);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--gap-md) var(--gap-lg);
  border-bottom: 1px solid var(--border-light);
}

.modal-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.modal-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 1.125rem;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.modal-close:hover {
  background: var(--bg-hover);
  color: var(--accent);
}

.modal-body {
  padding: var(--gap-lg);
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--gap-sm);
  padding: var(--gap-md) var(--gap-lg);
  border-top: 1px solid var(--border-light);
}

/* ------------------------------------------------------------
   21. Login / Signup Pages
   ------------------------------------------------------------ */
.auth-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--topbar-height));
  padding: var(--gap-xl);
}

.auth-card {
  width: 100%;
  max-width: 420px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--gap-xl);
}

.auth-card-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  text-align: center;
  margin-bottom: var(--gap-sm);
}

.auth-card-subtitle {
  font-size: 0.875rem;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: var(--gap-xl);
}

.auth-divider {
  height: 1px;
  background: var(--border-light);
  margin: var(--gap-lg) 0;
  position: relative;
}

.auth-divider-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--bg-secondary);
  padding: var(--gap-xs) var(--gap-md);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.auth-link {
  display: block;
  text-align: center;
  margin-top: var(--gap-lg);
  font-size: 0.875rem;
  color: var(--text-muted);
}

.auth-link a {
  color: var(--accent);
  font-weight: 600;
}

/* ------------------------------------------------------------
   22. Utility Classes
   ------------------------------------------------------------ */
.text-accent { color: var(--accent); }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-success { color: #28a745; }
.text-danger { color: var(--accent); }
.text-center { text-align: center; }
.text-right { text-align: right; }

.bg-primary { background-color: var(--bg-primary); }
.bg-secondary { background-color: var(--bg-secondary); }
.bg-card { background-color: var(--bg-card); }
.bg-input { background-color: var(--bg-input); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-xs { gap: var(--gap-xs); }
.gap-sm { gap: var(--gap-sm); }
.gap-md { gap: var(--gap-md); }
.gap-lg { gap: var(--gap-lg); }

.w-full { width: 100%; }
.h-full { height: 100%; }
.min-h-screen { min-height: 100vh; }

.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }

.rounded-sm { border-radius: var(--radius-sm); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-full { border-radius: 50%; }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

.hidden { display: none; }
.visible { display: block; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.truncate {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.line-clamp-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.m-0 { margin: 0; }
.mt-sm { margin-top: var(--gap-sm); }
.mt-md { margin-top: var(--gap-md); }
.mt-lg { margin-top: var(--gap-lg); }
.mt-xl { margin-top: var(--gap-xl); }
.mb-sm { margin-bottom: var(--gap-sm); }
.mb-md { margin-bottom: var(--gap-md); }
.mb-lg { margin-bottom: var(--gap-lg); }
.mb-xl { margin-bottom: var(--gap-xl); }

.p-0 { padding: 0; }
.p-sm { padding: var(--gap-sm); }
.p-md { padding: var(--gap-md); }
.p-lg { padding: var(--gap-lg); }
.p-xl { padding: var(--gap-xl); }

.border-b { border-bottom: 1px solid var(--border-light); }
.border-t { border-top: 1px solid var(--border-light); }

.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }

/* ------------------------------------------------------------
   23. Page-Specific Responsive Adjustments
   ------------------------------------------------------------ */

/* Topbar responsive */
@media (max-width: 768px) {
  .topbar-center {
    max-width: none;
    margin: 0 var(--gap-sm);
  }

  .search-input {
    height: 36px;
    font-size: 0.8125rem;
  }

  .search-btn {
    height: 36px;
  }

  .topbar-right .sidebar-toggle-btn {
    display: none;
  }
}

@media (max-width: 480px) {
  .topbar {
    padding: 0 var(--gap-sm);
  }

  .topbar-logo {
    font-size: 1rem;
  }

  .topbar-logo img {
    height: 24px;
  }

  .topbar-center {
    margin: 0 var(--gap-xs);
  }

  .user-dropdown {
    right: -60px;
  }
}

/* Sidebar responsive */
@media (max-width: 768px) {
  .sidebar {
    width: 100%;
    max-width: var(--sidebar-width-open);
  }

  .sidebar.sidebar-closed {
    transform: translateX(-100%);
  }

  .main-content {
    margin-left: 0 !important;
  }
}

/* Video player responsive */
@media (max-width: 768px) {
  .video-stats-row {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--gap-sm);
  }

  .video-action-btn {
    padding: var(--gap-xs) var(--gap-sm);
    font-size: 0.8125rem;
  }

  .video-channel-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--gap-md);
  }

  .subscribe-btn {
    width: 100%;
  }

  .related-video-item {
    flex-direction: column;
  }

  .related-video-item .related-thumb {
    width: 100%;
  }
}

/* Channel page responsive */
@media (max-width: 480px) {
  .channel-header {
    flex-direction: column;
    text-align: center;
  }

  .channel-header-avatar {
    width: 64px;
    height: 64px;
    font-size: 1.5rem;
  }
}

/* Auth page responsive */
@media (max-width: 480px) {
  .auth-card {
    padding: var(--gap-lg);
  }

  .auth-card-title {
    font-size: 1.25rem;
  }
}

/* ------------------------------------------------------------
   24. Print Styles
   ------------------------------------------------------------ */
@media print {
  .topbar,
  .sidebar,
  .toast-container,
  .modal-overlay {
    display: none !important;
  }

  .main-content {
    margin: 0 !important;
  }

  body {
    background: #fff;
    color: #000;
  }
}