:root {
  --bg: #ffffff;
  --fg: #1b1f24;
  --muted: #57606a;
  --panel: #f6f8fa;
  --border: #c9d1d9;
  --accent: #0b5cad;
  --focus: #9a5b00;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --fg: #e6edf3;
    --muted: #9da7b3;
    --panel: #161b22;
    --border: #3d444d;
    --accent: #4493f8;
    --focus: #f0a500;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--fg); }
body {
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  max-width: 760px;
  margin: 0 auto;
  padding: 0 16px;
}
a { color: var(--accent); }
a:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.site-header { padding: 16px 0; border-bottom: 1px solid var(--border); }
.logo { margin: 0; font-weight: 700; font-size: 1.15rem; }
.logo a { color: var(--fg); text-decoration: none; }
h1 { font-size: 2rem; margin: 28px 0 4px; line-height: 1.25; }
h2 { font-size: 1.3rem; margin: 32px 0 8px; }
.lead { font-size: 1.15rem; color: var(--muted); margin: 0 0 16px; }
.muted { color: var(--muted); }
.cards { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 8px; padding: 14px 16px; }
.card h3 { margin: 0 0 4px; font-size: 1.1rem; }
.card p { margin: 0; }
.site-footer { color: var(--muted); border-top: 1px solid var(--border); margin: 40px 0 24px; padding-top: 8px; font-size: 0.9rem; }