:root {
  --bg: #F3F6FA; --surface: #FFFFFF; --ink: #0B1B2B; --muted: #5D6E80; --line: rgba(11,27,43,0.08); --accent: #0A5BD3;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #060E18; --surface: #0E1A28; --ink: #EEF3F8; --muted: #93A4B6; --line: rgba(255,255,255,0.08); --accent: #3B82F6; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 56px; }
header { display: flex; align-items: center; gap: 12px; margin-bottom: 28px; }
header svg { width: 44px; height: 44px; flex: none; }
header a { color: inherit; text-decoration: none; font-weight: 800; font-size: 22px; letter-spacing: -0.4px; }
header small { display: block; color: var(--muted); font-weight: 500; font-size: 14px; letter-spacing: 0; }
h1 { font-size: 32px; line-height: 1.2; letter-spacing: -0.8px; margin: 0 0 8px; }
h2 { font-size: 20px; letter-spacing: -0.3px; margin: 32px 0 8px; }
p, li { color: var(--muted); }
strong { color: var(--ink); }
a { color: var(--accent); }
.updated { font-size: 14px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 18px 20px; margin: 16px 0; }
.card p { margin: 6px 0; }
nav { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 36px; }
nav a { background: var(--surface); border: 1px solid var(--line); border-radius: 99px; padding: 8px 14px; text-decoration: none; font-weight: 600; font-size: 14px; }
details { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 14px 18px; margin: 10px 0; }
summary { cursor: pointer; font-weight: 700; color: var(--ink); }
footer { margin-top: 40px; font-size: 13px; color: var(--muted); }