:root { --bg: #ffffff; --ink: #111827; --muted: #4b5563; --line: #e5e7eb; --accent: #1d4ed8; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #0b1020; --ink: #f3f4f6; --muted: #c7cbd3; --line: #273047; --accent: #93b4ff; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
header { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
header img { width: 48px; height: 48px; border-radius: 11px; }
h1 { font-size: 30px; line-height: 1.2; margin: 8px 0; }
h2 { font-size: 21px; margin: 32px 0 8px; }
p, li { color: var(--ink); }
.muted { color: var(--muted); font-size: 15px; }
.summary p { margin: 0; }
.summary { border: 1px solid var(--line); border-radius: 12px; padding: 16px; margin: 20px 0; }
a { color: var(--accent); }
nav { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 40px; padding-top: 16px; border-top: 1px solid var(--line); }