:root { --bg: #fff; --fg: #1d1d1f; --muted: #6e6e73; --accent: #0071e3; --line: #e5e5ea; }
@media (prefers-color-scheme: dark) { :root { --bg: #000; --fg: #f5f5f7; --muted: #a1a1a6; --line: #2c2c2e; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.8 -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Helvetica Neue", sans-serif; }
main { max-width: 680px; margin: 0 auto; padding: 48px 20px 80px; }
h1 { font-size: 28px; line-height: 1.3; margin: 0 0 8px; }
h2 { font-size: 18px; margin: 40px 0 8px; }
p, li { margin: 8px 0; }
ul { padding-left: 22px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.meta { color: var(--muted); font-size: 14px; }
nav { font-size: 14px; margin-bottom: 32px; }
nav a + a { margin-left: 16px; }
footer { margin-top: 64px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }