:root {
  color-scheme: light dark;
  /* Dark theme (default). */
  --bg: #0d1117;
  --panel: #161b22;
  --border: #30363d;
  --fg: #e6edf3;
  --muted: #8b949e;
  --accent: #58a6ff;
  --accent-fg: #06131f;
  --good: #3fb950;
  --bad: #f85149;
  --canvas-bg: #000;
  --error-bg: #3d1418;
  --error-fg: #ffb4ae;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

/* Light theme: follows the OS/browser preference. */
@media (prefers-color-scheme: light) {
  :root {
    --bg: #ffffff;
    --panel: #f6f8fa;
    --border: #d0d7de;
    --fg: #1f2328;
    --muted: #636c76;
    --accent: #0969da;
    --accent-fg: #ffffff;
    --good: #1a7f37;
    --bad: #cf222e;
    --canvas-bg: #d0d7de;
    --error-bg: #ffebe9;
    --error-fg: #82071e;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  padding: 1rem clamp(1rem, 4vw, 3rem) 4rem;
}

header h1 { margin: 0; font-size: 1.5rem; }
.tagline { color: var(--muted); margin: 0.25rem 0 1rem; }

#main, main { display: block; }

canvas {
  width: 100%;
  max-width: 640px;
  aspect-ratio: 16 / 9;
  height: auto;
  background: var(--canvas-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: block;
}

#unsupported {
  background: var(--error-bg);
  border: 1px solid var(--bad);
  color: var(--error-fg);
  padding: 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
}

#panel { margin-top: 1.5rem; }

.bench-list { list-style: none; padding: 0; margin: 0 0 1rem; display: grid; gap: 0.4rem; }
.bench-list li { display: flex; align-items: baseline; gap: 0.5rem; }
.bench-list label { cursor: pointer; }
.bench-list .desc { color: var(--muted); font-size: 0.85rem; }

button {
  background: var(--accent);
  color: var(--accent-fg);
  border: none;
  padding: 0.55rem 1.1rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
}
button:disabled { opacity: 0.5; cursor: default; }
button.secondary { background: var(--panel); color: var(--fg); border: 1px solid var(--border); }
button.secondary.active { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }

.toolbar { display: flex; gap: 0.6rem; flex-wrap: wrap; align-items: center; margin-bottom: 1rem; }
input[type="text"] {
  background: var(--panel); border: 1px solid var(--border); color: var(--fg);
  padding: 0.5rem 0.6rem; border-radius: 6px; font-size: 0.95rem;
}

table { border-collapse: collapse; width: 100%; margin-top: 1rem; }
th, td { text-align: left; padding: 0.45rem 0.7rem; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
.overall { font-size: 1.2rem; font-weight: 700; color: var(--good); }
.status { color: var(--muted); margin: 0.5rem 0; min-height: 1.2em; }

.dropzone {
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  text-align: center;
  color: var(--muted);
  margin-top: 1.5rem;
}
.dropzone.over { border-color: var(--accent); color: var(--fg); }
.delta-up { color: var(--good); }
.delta-down { color: var(--bad); }