/* ═══════════════════════════════════════════
   Video Annotation Tool — Style
   Spotify-inspired dark immersive aesthetic
   ═══════════════════════════════════════════ */

/* ─── DESIGN TOKENS (Spotify) ─── */
:root {
  --bg-deep:    #121212;
  --bg-surface: #181818;
  --bg-raised:  #1f1f1f;
  --bg-hover:   #252525;
  --border:     #4d4d4d;
  --text-1:     #ffffff;
  --text-2:     #b3b3b3;
  --text-3:     #7c7c7c;
  --accent:     #1ed760;
  --accent-dim: rgba(30,215,96,.15);
  --danger:     #f3727f;
  --success:    #1ed760;
  --yellow:     #ffa42b;
  --radius-sm:  8px;
  --radius-md:  500px;
  --radius-lg:  9999px;
  --font-body:  'Outfit', 'Circular', 'Helvetica Neue', helvetica, arial, 'Hiragino Sans', system-ui, sans-serif;
  --font-mono:  'JetBrains Mono', 'Fira Code', monospace;
  --transition: 180ms ease;
  --shadow-heavy: rgba(0,0,0,.5) 0px 8px 24px;
  --shadow-medium: rgba(0,0,0,.3) 0px 8px 8px;
}

/* ─── RESET ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 15px; }
body {
  font-family: var(--font-body);
  background: var(--bg-deep);
  color: var(--text-1);
  min-height: 100dvh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input[type="range"] { -webkit-appearance: none; appearance: none; background: none; cursor: pointer; }

.hidden { display: none !important; }

/* ─── LANDING ─── */
.landing {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  padding: 2rem;
  animation: fadeIn .6s ease;
}
.landing-inner {
  text-align: center;
  max-width: 420px;
}
.landing-icon {
  color: var(--accent);
  margin-bottom: 1.5rem;
  animation: float 3s ease-in-out infinite;
}
.landing h1 {
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  margin-bottom: .5rem;
}
.landing-sub {
  color: var(--text-2);
  font-size: .93rem;
  line-height: 1.6;
  margin-bottom: 2rem;
}
.file-label {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .7rem 2rem;
  background: var(--accent);
  color: var(--bg-deep);
  font-weight: 700;
  font-size: .9rem;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}
.file-label:hover {
  transform: translateY(-2px) scale(1.04);
  box-shadow: 0 8px 24px rgba(30,215,96,.35);
}

/* ─── WORKSPACE ─── */
.workspace {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  animation: fadeIn .4s ease;
}

/* ─── TOPBAR ─── */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .5rem 1rem;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.topbar-left, .topbar-right {
  display: flex;
  align-items: center;
  gap: .5rem;
}
.topbar-title {
  font-size: .85rem;
  font-family: var(--font-mono);
  color: var(--text-2);
  max-width: 260px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ─── BUTTONS ─── */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.icon-btn:hover { background: var(--bg-hover); }

.text-btn {
  padding: .4rem 1rem;
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .8px;
  text-transform: uppercase;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.text-btn:hover { background: var(--bg-hover); border-color: var(--text-3); }
.text-btn.accent {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}
.text-btn.accent:hover {
  background: var(--accent);
  color: var(--bg-deep);
}

/* ─── STAGE (VIDEO + CANVAS) ─── */
.stage-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #000;
  overflow: hidden;
  position: relative;
}
.stage {
  position: relative;
  display: inline-block;
  max-width: 100%;
  max-height: 100%;
  line-height: 0;
}
.stage video {
  display: block;
  max-width: 100%;
  max-height: calc(100dvh - 140px);
  object-fit: contain;
}
#canvasContainer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none; /* default — toggled in JS */
  touch-action: none;   /* iPad: prevent scroll/zoom hijacking pen input */
  -webkit-user-select: none;
  user-select: none;
}
#canvasContainer canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
  touch-action: none;   /* iPad: prevent scroll/zoom on canvas element */
}

/* ─── DRAW INDICATOR ─── */
.draw-indicator {
  position: absolute;
  top: 12px;
  left: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: rgba(0,0,0,.65);
  backdrop-filter: blur(6px);
  border-radius: 20px;
  font-size: .75rem;
  font-weight: 500;
  color: var(--success);
  pointer-events: none;
  z-index: 5;
  animation: fadeIn .3s ease;
}
.draw-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--success);
  animation: pulse 1.4s ease-in-out infinite;
}

/* ─── CONTROLS ─── */
.controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: .5rem 1rem;
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}
.ctrl-group {
  display: flex;
  align-items: center;
  gap: .25rem;
}
.ctrl-timeline {
  flex: 1;
  display: flex;
  align-items: center;
  gap: .6rem;
}
.timecode {
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--text-3);
  min-width: 58px;
  text-align: center;
  user-select: none;
}

/* ─── PLAY BUTTON ─── */
.play-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--bg-deep);
  transition: transform var(--transition), box-shadow var(--transition);
}
.play-btn:hover {
  transform: scale(1.08);
  box-shadow: 0 0 20px rgba(30,215,96,.45);
}

/* ─── TIMELINE SLIDER ─── */
.timeline-wrapper {
  flex: 1;
  position: relative;
  height: 20px;
  display: flex;
  align-items: center;
}
.timeline-markers {
  position: absolute;
  top: 0;
  left: 7px;   /* half of slider thumb width */
  right: 7px;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}
.timeline-markers .tm {
  position: absolute;
  top: 1px;
  width: 3px;
  height: 8px;
  border-radius: 1px;
  background: var(--yellow);
  opacity: .85;
  transform: translateX(-50%);
  pointer-events: none;
  transition: opacity .2s ease;
}
.timeline-markers .tm::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 50%;
  transform: translateX(-50%);
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--yellow);
  opacity: .5;
}
.timeline {
  flex: 1;
  height: 6px;
  position: relative;
  z-index: 2;
}
.timeline::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 2px;
  background: var(--bg-hover);
}
.timeline::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  margin-top: -5px;
  box-shadow: 0 0 6px rgba(30,215,96,.5);
  transition: transform .15s ease;
  position: relative;
  z-index: 3;
}
.timeline::-webkit-slider-thumb:hover { transform: scale(1.3); }

.timeline::-moz-range-track {
  height: 4px;
  border-radius: 2px;
  background: var(--bg-hover);
}
.timeline::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: none;
  box-shadow: 0 0 6px rgba(30,215,96,.5);
}

/* ─── COLOR PALETTE ─── */
.color-palette {
  display: flex;
  align-items: center;
  gap: 5px;
  margin-right: .4rem;
}
.color-swatch {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--sw);
  border: 2px solid transparent;
  transition: transform var(--transition), border-color var(--transition);
  position: relative;
}
.color-swatch:hover { transform: scale(1.15); }
.color-swatch.active {
  border-color: var(--text-1);
  transform: scale(1.15);
  box-shadow: 0 0 8px var(--sw);
}

/* ─── STATUS BAR ─── */
.status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .3rem 1rem;
  background: var(--bg-raised);
  border-top: 1px solid var(--border);
  font-size: .73rem;
  font-family: var(--font-mono);
  color: var(--text-3);
  flex-shrink: 0;
}
#frameAnnotationHint { color: var(--yellow); }

/* ─── DRAW TOOLS SEPARATOR ─── */
.draw-tools::before {
  content: '';
  width: 1px;
  height: 22px;
  background: var(--border);
  margin-right: .3rem;
}

/* ─── TAB BAR ─── */
.tab-bar {
  display: flex;
  align-items: center;
  gap: 2px;
  overflow-x: auto;
  max-width: 55vw;
  scrollbar-width: none;
  padding: 2px 0;
}
.tab-bar::-webkit-scrollbar { display: none; }

.tab-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  background: var(--bg-raised);
  border-radius: 6px 6px 0 0;
  font-size: .75rem;
  font-family: var(--font-mono);
  color: var(--text-3);
  cursor: pointer;
  white-space: nowrap;
  max-width: 180px;
  transition: background var(--transition), color var(--transition);
  border: 1px solid transparent;
  border-bottom: none;
  user-select: none;
}
.tab-item:hover { background: var(--bg-hover); color: var(--text-2); }
.tab-item.active {
  background: var(--bg-surface);
  color: var(--text-1);
  border-color: var(--border);
}
.tab-name {
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 130px;
}
.tab-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border-radius: 3px;
  opacity: 0;
  transition: opacity .15s, background .15s;
  flex-shrink: 0;
}
.tab-item:hover .tab-close,
.tab-item.active .tab-close { opacity: .5; }
.tab-close:hover { opacity: 1 !important; background: rgba(243,114,127,.2); color: var(--danger); }

/* ─── DROP OVERLAY ─── */
.drop-overlay {
  position: absolute;
  inset: 0;
  background: rgba(30,215,96,.06);
  border: 2px dashed var(--accent);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: .95rem;
  font-weight: 500;
  color: var(--accent);
  z-index: 10;
  backdrop-filter: blur(4px);
  animation: fadeIn .2s ease;
}

/* ─── ANIMATIONS ─── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-8px); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: .4; }
}

/* ─── RESPONSIVE ───*/
@media (max-width: 700px) {
  .tab-bar { max-width: 45vw; }
  .tab-name { max-width: 80px; }
  .controls { flex-wrap: wrap; gap: .5rem; }
  .ctrl-timeline { order: 3; width: 100%; flex: unset; }
  .draw-tools { order: 2; }
}

/* ─── FPS INDICATOR ─── */
.fps-indicator {
  margin-left: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: rgba(255,255,255,0.35);
  letter-spacing: 0.04em;
}