/* MANDATORY: Apply color-scheme to :root or html for viewport-wide theming */
:root {
  color-scheme: light dark;

  /* Raw light and dark tokens */
  --bg-canvas-light: #f8fafc;
  --bg-canvas-dark: #090d16;

  --bg-surface-light: #ffffff;
  --bg-surface-dark: #111827;

  --bg-elevated-light: #f1f5f9;
  --bg-elevated-dark: #1e293b;

  --text-primary-light: #0f172a;
  --text-primary-dark: #f8fafc;

  --text-muted-light: #475569;
  --text-muted-dark: #94a3b8;

  --border-subtle-light: #e2e8f0;
  --border-subtle-dark: #1e293b;

  --brand-accent-light: #0284c7;
  --brand-accent-dark: #38bdf8;

  --brand-tint-light: rgba(2, 132, 199, 0.1);
  --brand-tint-dark: rgba(56, 189, 248, 0.14);

  --scrollbar-track-light: #f1f5f9;
  --scrollbar-track-dark: #0f172a;
  --scrollbar-thumb-light: #cbd5e1;
  --scrollbar-thumb-dark: #334155;

  /* Default (light) assignments for fallback */
  --bg-canvas: var(--bg-canvas-light);
  --bg-surface: var(--bg-surface-light);
  --bg-elevated: var(--bg-elevated-light);
  --text-primary: var(--text-primary-light);
  --text-muted: var(--text-muted-light);
  --border-subtle: var(--border-subtle-light);
  --accent-color: var(--brand-accent-light);
  --brand-tint: var(--brand-tint-light);
  --scrollbar-track: var(--scrollbar-track-light);
  --scrollbar-thumb: var(--scrollbar-thumb-light);

  /* MANDATORY: Fallback for browsers without light-dark support */
  @media (prefers-color-scheme: dark) {
    --bg-canvas: var(--bg-canvas-dark);
    --bg-surface: var(--bg-surface-dark);
    --bg-elevated: var(--bg-elevated-dark);
    --text-primary: var(--text-primary-dark);
    --text-muted: var(--text-muted-dark);
    --border-subtle: var(--border-subtle-dark);
    --accent-color: var(--brand-accent-dark);
    --brand-tint: var(--brand-tint-dark);
    --scrollbar-track: var(--scrollbar-track-dark);
    --scrollbar-thumb: var(--scrollbar-thumb-dark);
  }

  /* Modern light-dark() when supported */
  @supports (color: light-dark(white, black)) {
    --bg-canvas: light-dark(var(--bg-canvas-light), var(--bg-canvas-dark));
    --bg-surface: light-dark(var(--bg-surface-light), var(--bg-surface-dark));
    --bg-elevated: light-dark(var(--bg-elevated-light), var(--bg-elevated-dark));
    --text-primary: light-dark(var(--text-primary-light), var(--text-primary-dark));
    --text-muted: light-dark(var(--text-muted-light), var(--text-muted-dark));
    --border-subtle: light-dark(var(--border-subtle-light), var(--border-subtle-dark));
    --accent-color: light-dark(var(--brand-accent-light), var(--brand-accent-dark));
    --brand-tint: light-dark(var(--brand-tint-light), var(--brand-tint-dark));
    --scrollbar-track: light-dark(var(--scrollbar-track-light), var(--scrollbar-track-dark));
    --scrollbar-thumb: light-dark(var(--scrollbar-thumb-light), var(--scrollbar-thumb-dark));
  }

  accent-color: var(--accent-color);
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

/* Legacy fallback for WebKit/Blink browsers without scrollbar-color */
@supports not (scrollbar-color: auto) {
  ::-webkit-scrollbar {
    width: 10px;
    height: 10px;
  }
  ::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 5px;
  }
  ::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
  }
}

*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, Helvetica, Arial, sans-serif;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

body.drag-over::after {
  content: "Drop video file to play immediately";
  position: fixed;
  inset: 1rem;
  border: 2px dashed var(--accent-color);
  border-radius: 16px;
  background: rgba(9, 13, 22, 0.85);
  color: #f8fafc;
  display: grid;
  place-items: center;
  font-size: 1.25rem;
  font-weight: 600;
  z-index: 100;
  pointer-events: none;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  backdrop-filter: blur(12px);
}

.header-inner {
  max-width: 1600px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.01em;
}

.brand-icon {
  color: var(--accent-color);
  display: inline-flex;
}

.brand-sub {
  font-weight: 500;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-left: 0.25rem;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex: 1;
  max-width: 520px;
  justify-content: flex-end;
}

.search-box {
  position: relative;
  flex: 1;
  max-width: 340px;
}

.search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

#search-input {
  width: 100%;
  padding: 0.45rem 0.75rem 0.45rem 2.25rem;
  border-radius: 8px;
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-elevated);
  color: var(--text-primary);
  font-size: 0.875rem;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

#search-input:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--brand-tint);
}

/* Main Layout */
.layout {
  max-width: 1600px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 1.5rem;
  flex: 1;
  align-items: start;
}

.layout.is-theater {
  grid-template-columns: minmax(0, 1fr);
}

@media (max-width: 1024px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
    padding: 1rem;
  }
}

/* Video Stage */
.stage-section {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.player-shell {
  width: 100%;
  background: #000;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 18px 40px -15px rgba(0, 0, 0, 0.55);
  border: 1px solid var(--border-subtle);
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
}

.layout.is-theater .player-shell {
  max-height: 78vh;
}

.video-element {
  width: 100%;
  height: 100%;
  max-height: 78vh;
  display: block;
  background: #000;
}

.video-meta-bar {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.video-info {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 220px;
  flex: 1;
}

.video-title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  word-break: break-word;
}

.video-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.55rem;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  background-color: var(--bg-elevated);
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.badge-filename {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.player-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.speed-group {
  display: inline-flex;
  align-items: center;
  background-color: var(--bg-elevated);
  padding: 0.2rem;
  border-radius: 8px;
  border: 1px solid var(--border-subtle);
  gap: 0.15rem;
}

.action-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 0 0.45rem;
}

.chip {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.5rem;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

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

.chip.is-active {
  background-color: var(--bg-surface);
  color: var(--accent-color);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.12);
}

.utility-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.75rem;
  border-radius: 8px;
  font-size: 0.8125rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-elevated);
  color: var(--text-primary);
  transition: border-color 0.15s ease, background-color 0.15s ease, color 0.15s ease;
}

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

.shortcuts-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.25rem;
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

kbd {
  display: inline-block;
  padding: 0.1rem 0.38rem;
  font-size: 0.7rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  color: var(--text-primary);
  margin-right: 0.2rem;
}

/* Library Sidebar */
.library-sidebar {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  max-height: calc(100vh - 6rem);
  position: sticky;
  top: 4.5rem;
}

.sidebar-header {
  padding: 1rem 1.15rem;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
}

.sidebar-title code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.92em;
  color: var(--accent-color);
}

.sidebar-subtitle {
  margin: 0.15rem 0 0;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.video-list {
  list-style: none;
  margin: 0;
  padding: 0.6rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  flex: 1;
}

.video-card {
  width: 100%;
  text-align: left;
  border: 1px solid transparent;
  background-color: transparent;
  color: var(--text-primary);
  padding: 0.75rem;
  border-radius: 10px;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.video-card:hover {
  background-color: var(--bg-elevated);
}

.video-card.is-active {
  background-color: var(--brand-tint);
  border-color: var(--accent-color);
}

.card-icon {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  background-color: var(--bg-elevated);
  color: var(--accent-color);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.video-card.is-active .card-icon {
  background-color: var(--accent-color);
  color: #090d16;
}

.card-body {
  flex: 1;
  min-width: 0;
}

.card-title {
  font-weight: 600;
  font-size: 0.9rem;
  margin: 0 0 0.2rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  font-variant-numeric: tabular-nums;
}

.empty-state {
  padding: 2rem 1rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.dropzone-hint {
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--border-subtle);
  background-color: var(--bg-elevated);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.dropzone-hint p {
  margin: 0;
}