:root {
  --text: #1f2328;
  --muted: #57606a;
  --line: #d0d7de;
  --panel: #f6f8fa;
  --accent: #0969da;
  --background: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #e6edf3;
    --muted: #9da7b3;
    --line: #30363d;
    --panel: #161b22;
    --accent: #4493f8;
    --background: #0d1117;
  }
}

* { box-sizing: border-box; }

body {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 16px;
  font: 16px/1.5 system-ui, sans-serif;
  color: var(--text);
  background: var(--background);
}

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

header { border-bottom: 1px solid var(--line); margin-bottom: 24px; }
header h1 { margin-top: 0; }

.columns { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
@media (max-width: 760px) { .columns { grid-template-columns: 1fr; } }

label { display: block; margin-bottom: 8px; font-weight: 600; }
h2 { font-size: 1rem; margin: 24px 0 8px; }

.examples { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }

.example {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  font: inherit;
  font-size: 0.8rem;
  text-align: left;
  cursor: pointer;
}
.example:hover, .example:focus-visible { border-color: var(--accent); }
.example img { width: 100%; border-radius: 4px; }

#status { color: var(--muted); min-height: 1.5em; }

.bar { display: grid; grid-template-columns: 7rem 1fr 3rem; align-items: center; gap: 8px; margin: 4px 0; }
.track { height: 12px; background: var(--panel); border: 1px solid var(--line); border-radius: 6px; overflow: hidden; }
.fill { display: block; height: 100%; background: var(--accent); }

#heatmap { display: block; width: 100%; max-width: 448px; margin-top: 16px; border-radius: 8px; }
#heatmap[hidden] { display: none; }
.caption { color: var(--muted); font-size: 0.85rem; }

footer { margin-top: 40px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.85rem; }