:root { --bg: #ffffff; --text: #1d1d1f; --muted: #6e6e73; --line: #e5e5ea; --link: #0a66c2; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #121212; --text: #ececec; --muted: #9a9aa0; --line: #2c2c2e; --link: #6aa8ff; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.7 -apple-system, "Segoe UI", Roboto, Arial, sans-serif; }
main { max-width: 860px; margin: 0 auto; padding: 40px 20px 64px; }
h1 { font-size: 28px; line-height: 1.3; margin: 0 0 8px; }
h2 { font-size: 18px; margin: 28px 0 8px; }
p, li { margin: 0 0 8px; }
ul, ol { padding-left: 22px; margin: 0 0 8px; }
a { color: var(--link); }
.meta { color: var(--muted); font-size: 14px; }
.divider { border-top: 1px solid var(--line); margin-top: 40px; padding-top: 24px; font-size: 20px; font-weight: 600; }