:root {
  color-scheme: dark;
  --bg: #0a0e12;
  --bg-card: #121820;
  --bg-elevated: #1a2230;
  --fg: #eef2f6;
  --muted: #8b95a5;
  --accent: #3ecf6e;
  --accent-dim: #2a9d52;
  --bat: #f5c542;
  --bat-glow: rgba(245, 197, 66, 0.45);
  --pose: #5eb8ff;
  --danger: #f87171;
  --border: rgba(255, 255, 255, 0.08);
  --radius: 12px;
  font-family: "SF Pro Text", ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(900px 500px at 80% -5%, rgba(62, 207, 110, 0.12), transparent),
    radial-gradient(600px 400px at 10% 100%, rgba(94, 184, 255, 0.08), transparent),
    var(--bg);
  color: var(--fg);
  line-height: 1.5;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.app {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.25rem 1rem 2.5rem;
}

.header { margin-bottom: 1.5rem; }

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.7rem;
  color: var(--accent);
  margin: 0 0 0.5rem;
  font-weight: 600;
}

h1 {
  font-size: clamp(1.6rem, 5vw, 2.1rem);
  line-height: 1.15;
  margin: 0 0 0.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.lede {
  font-size: 0.95rem;
  color: var(--muted);
  margin: 0;
  line-height: 1.55;
}

.controls { margin-bottom: 1rem; }

.control-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.6rem 1rem;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
  font-family: inherit;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--accent);
  color: #041208;
}

.btn-primary:hover { background: var(--accent-dim); }

.btn-primary[aria-pressed="true"] {
  box-shadow: 0 0 0 2px var(--bg), 0 0 0 4px var(--accent);
}

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--fg);
  border-color: var(--border);
}

.btn-secondary:hover { border-color: rgba(255, 255, 255, 0.2); }

.btn-ghost {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  padding: 0.45rem 0.7rem;
  border-radius: 8px;
  min-width: 2.5rem;
}

.upload-label { cursor: pointer; }

.mode-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.65rem;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(62, 207, 110, 0.12);
  border: 1px solid rgba(62, 207, 110, 0.35);
}

.mode-label {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0.6rem 0 0;
}

.stage {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 1.25rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.stage--sample {
  border-color: rgba(62, 207, 110, 0.25);
  box-shadow: inset 0 0 0 1px rgba(62, 207, 110, 0.08);
}

.canvas-wrap {
  position: relative;
  aspect-ratio: 16 / 9;
  background: #060a0e;
}

#video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

#canvas {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.loading {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(6, 10, 14, 0.75);
  font-size: 0.9rem;
  color: var(--accent);
  font-weight: 600;
}

.hidden { display: none !important; }

.scrubber-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 0.75rem;
  border-top: 1px solid var(--border);
}

#scrubber {
  flex: 1;
  accent-color: var(--muted);
  height: 4px;
  transition: accent-color 0.15s;
}

#scrubber.scrubber-active,
#scrubber:focus-visible {
  accent-color: var(--accent);
}

.metrics h2,
.summary h2 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin: 0 0 0.35rem;
  font-weight: 600;
}

.metrics-note {
  font-size: 0.75rem;
  color: var(--muted);
  margin: 0 0 0.75rem;
}

.metrics-group {
  margin-bottom: 1rem;
}

.metrics-group:last-child {
  margin-bottom: 0;
}

.metrics-subheading {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 0 0 0.5rem;
  font-weight: 600;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.6rem;
}

.metric-grid--playhead {
  grid-template-columns: 1fr;
  max-width: 8rem;
}

@media (min-width: 480px) {
  .metric-grid:not(.metric-grid--playhead) {
    grid-template-columns: repeat(4, 1fr);
  }
}

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem 0.65rem;
  text-align: center;
}

.metric-label {
  display: block;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.metric-value {
  display: block;
  font-size: 1.1rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--fg);
}

.metric-value.highlight { color: var(--accent); }

.metrics-footnotes {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  margin: 0.6rem 0 0;
  font-size: 0.68rem;
  color: var(--muted);
  line-height: 1.45;
}

.summary {
  margin-top: 1.25rem;
  padding: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.summary ul {
  margin: 0.5rem 0 0;
  padding-left: 1.2rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.summary li { margin-bottom: 0.35rem; }

.footer {
  margin-top: 2rem;
  text-align: center;
  font-size: 0.75rem;
  color: var(--muted);
}

.footer p { margin: 0; }