:root { --bg: #ffffff; --fg: #1a1f2b; --muted: #5a6475; --accent: #1f6feb; --line: #e3e7ee; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #0b1020; --fg: #e6eaf2; --muted: #9aa4b6; --accent: #58a6ff; --line: #222a3d; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
main { max-width: 760px; margin: 0 auto; padding: 48px 16px 64px; }
header { display: flex; align-items: center; gap: 12px; margin-bottom: 32px; }
header a { color: var(--fg); text-decoration: none; font-weight: 700; font-size: 1.25rem; }
nav { margin-left: auto; display: flex; gap: 16px; font-size: .95rem; }
nav a { color: var(--muted); font-weight: 400; font-size: .95rem; }
h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 1.2rem; margin: 32px 0 8px; }
p, li { color: var(--fg); }
.muted { color: var(--muted); }
a { color: var(--accent); }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: .9rem; }