:root { --fg: #1d2129; --muted: #5b6270; --bg: #ffffff; --line: #e3e6eb; --accent: #1a73e8; }
@media (prefers-color-scheme: dark) { :root { --fg: #e8eaed; --muted: #a3a9b4; --bg: #15171a; --line: #2c3036; --accent: #8ab4f8; } }
* { 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; }
header, main, footer { max-width: 760px; margin: 0 auto; padding: 0 16px; }
header { display: flex; justify-content: space-between; align-items: center; padding-top: 20px; padding-bottom: 20px; border-bottom: 1px solid var(--line); }
header a.brand { font-weight: 700; font-size: 18px; color: var(--fg); text-decoration: none; }
nav a { margin-left: 16px; color: var(--muted); text-decoration: none; font-size: 15px; }
nav a:hover, a { color: var(--accent); }
main { padding-top: 24px; padding-bottom: 40px; }
h1 { font-size: 30px; line-height: 1.25; margin: 8px 0 12px; }
h2 { font-size: 20px; margin-top: 32px; }
.muted { color: var(--muted); }
.card { border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px; margin: 16px 0; }
.card h3 { margin: 0 0 6px; font-size: 17px; }
footer { border-top: 1px solid var(--line); padding-top: 16px; padding-bottom: 32px; font-size: 14px; color: var(--muted); }
footer a { color: var(--muted); margin-right: 14px; }
@media (max-width: 520px) { header { flex-direction: column; align-items: flex-start; gap: 8px; } nav a { margin: 0 14px 0 0; } }