:root { --fg:#1f2937; --muted:#6b7280; --accent:#0f766e; --bg:#ffffff; --line:#e5e7eb; }
@media (prefers-color-scheme: dark) { :root { --fg:#e5e7eb; --muted:#9ca3af; --accent:#5eead4; --bg:#111827; --line:#374151; } }
* { box-sizing: border-box; }
body { margin:0; background:var(--bg); color:var(--fg); font:16px/1.6 -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 24px 16px 64px; }
h1 { font-size: 1.7rem; line-height:1.25; margin: 0 0 4px; }
h2 { font-size: 1.2rem; margin: 32px 0 8px; }
p, li { margin: 0 0 12px; }
ul { padding-left: 20px; }
a { color: var(--accent); }
.meta { color: var(--muted); font-size: .9rem; margin-bottom: 24px; }
nav { font-size: .9rem; margin-bottom: 24px; }
nav a + a { margin-left: 12px; }
.card { border:1px solid var(--line); border-radius: 10px; padding: 16px; margin: 16px 0; }
footer { color: var(--muted); font-size: .85rem; border-top: 1px solid var(--line); margin-top: 48px; padding-top: 16px; }
code { background: rgba(127,127,127,.15); padding: 1px 5px; border-radius: 4px; }