:root {
  --bg: #fbfaf8; --fg: #1d1d1f; --muted: #6b6b70; --line: #e6e3de; --accent: #3b5bdb;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #141416; --fg: #ececef; --muted: #9a9aa2; --line: #2a2a2f; --accent: #8ea6ff; }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg); color: var(--fg);
  font: 17px/1.6 -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh; display: flex; flex-direction: column;
}
main { width: 100%; max-width: 680px; margin: 0 auto; padding: 48px 16px 64px; flex: 1; }
a { color: var(--accent); }
header.brand { font-weight: 700; letter-spacing: -0.01em; font-size: 20px; }
header.brand a { color: var(--fg); text-decoration: none; }
.hero { padding-top: 18vh; }
.hero h1 { font-size: clamp(36px, 7vw, 56px); line-height: 1.05; letter-spacing: -0.03em; margin: 0 0 16px; }
.hero p { color: var(--muted); font-size: 19px; margin: 0 0 8px; max-width: 34em; }
.doc h1 { font-size: 32px; letter-spacing: -0.02em; margin: 32px 0 4px; }
.doc .date { color: var(--muted); margin: 0 0 28px; }
.doc h2 { font-size: 19px; margin: 32px 0 6px; }
.doc p, .doc li { margin: 0 0 10px; }
.doc ul { padding-left: 1.2em; }
footer { border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
footer div { max-width: 680px; margin: 0 auto; padding: 18px 16px; display: flex; gap: 18px; flex-wrap: wrap; }
footer a { color: var(--muted); }