:root { color-scheme: light dark; --bg: #eaf6fb; --fg: #12324a; --muted: #4f6b80; --card: #ffffff; --accent: #1f8fbf; }
@media (prefers-color-scheme: dark) { :root { --bg: #0b1d2b; --fg: #e3f1f8; --muted: #9db6c6; --card: #12293b; --accent: #5cc3ea; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
h1 { font-size: 2rem; margin: 0 0 4px; }
h2 { margin-top: 2em; font-size: 1.25rem; }
h3 { margin-top: 1.5em; font-size: 1.05rem; }
a { color: var(--accent); }
.muted { color: var(--muted); }
.card { background: var(--card); border-radius: 12px; padding: 16px 20px; margin: 16px 0; }
nav { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 32px; font-size: .95rem; }
hr { border: 0; border-top: 1px solid var(--muted); opacity: .3; margin: 40px 0; }