:root { --bg: #ffffff; --fg: #1a1d21; --muted: #5b6470; --line: #e3e7ec; --accent: #0f766e; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f1216; --fg: #e8ebef; --muted: #98a2b0; --line: #262c34; --accent: #2dd4bf; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
header, main, footer { max-width: 720px; margin: 0 auto; padding: 0 16px; }
header { padding-top: 20px; padding-bottom: 12px; border-bottom: 1px solid var(--line); display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 8px; }
header a.brand { font-weight: 700; font-size: 20px; color: var(--fg); text-decoration: none; display: inline-flex; align-items: center; gap: 10px; }
nav a { color: var(--muted); text-decoration: none; margin-left: 16px; font-size: 14px; }
nav a:hover { color: var(--accent); }
main { padding-top: 24px; padding-bottom: 40px; }
h1 { font-size: 28px; line-height: 1.25; margin: 0 0 4px; }
h2 { font-size: 19px; margin: 32px 0 8px; }
p, li { color: var(--fg); }
.muted { color: var(--muted); font-size: 14px; }
a { color: var(--accent); }
ul { padding-left: 20px; }
.card { border: 1px solid var(--line); border-radius: 12px; padding: 16px; margin: 16px 0; }
footer { padding-top: 16px; padding-bottom: 32px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }