:root {
  color-scheme: light dark;
  --fg: #1f2328;
  --muted: #6b7280;
  --border: #d0d7de;
  --bg: #ffffff;
  --link: #1a56db;
}
@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e6edf3;
    --muted: #9198a1;
    --border: #30363d;
    --bg: #0d1117;
    --link: #58a6ff;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  padding: 1.5rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Noto Sans JP", Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
}
.card {
  max-width: 760px;
  margin: 0 auto;
  padding: 20px 24px;
  border: 1px solid var(--border);
  border-radius: 16px;
}
.brand { display: flex; gap: 12px; align-items: flex-start; margin-bottom: 4px; }
.brand .emoji { font-size: 28px; line-height: 1; }
h1 { font-size: 18px; margin: 0 0 4px; }
h1 code { font-size: 15px; font-weight: 400; color: var(--muted); }
h2 { font-size: 15px; margin: 18px 0 6px; }
.tagline { margin: 0; font-size: 13px; color: var(--muted); }
p { font-size: 14px; line-height: 1.6; margin: 8px 0; }
ul { margin: 6px 0; padding-left: 20px; font-size: 14px; line-height: 1.6; }
ul.links { list-style: none; padding-left: 0; display: flex; flex-wrap: wrap; gap: 6px 18px; }
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
hr { border: none; border-top: 1px solid var(--border); margin: 16px 0; }
.fine-print { font-size: 12px; color: var(--muted); margin-top: 16px; }