:root { --bg: #fbfbfd; --text: #1d1d1f; --muted: #6e6e73; --line: rgba(0, 0, 0, 0.08); --accent: #5c6bff; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) { --bg: #0d0d10; --text: #f5f5f7; --muted: #a1a1a6; --line: rgba(255, 255, 255, 0.09); }
}
:root[data-theme="dark"] { --bg: #0d0d10; --text: #f5f5f7; --muted: #a1a1a6; --line: rgba(255, 255, 255, 0.09); }
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
main { max-width: 720px; margin: 0 auto; padding: 40px 16px 80px; }
.back { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; text-decoration: none; color: var(--text); }
.back img { width: 28px; height: 28px; }
h1 { font-size: 40px; letter-spacing: -0.02em; margin: 36px 0 4px; }
h2 { font-size: 20px; margin: 32px 0 6px; }
p, li { color: var(--muted); }
b { color: var(--text); }
a { color: var(--accent); }
.updated { font-size: 14px; border-bottom: 1px solid var(--line); padding-bottom: 20px; }