:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --border: #dfe2e8;
  --text: #1b1e24;
  --muted: #646b78;
  --accent: #4f6ef7;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111318;
    --surface: #181b22;
    --border: #2c313c;
    --text: #e8e9ed;
    --muted: #9aa0ab;
    --accent: #6f8bff;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); }
header { display: flex; align-items: center; gap: 10px; padding: 16px; max-width: 820px; margin: 0 auto; }
header a.home { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; }
.mark { width: 28px; height: 28px; border-radius: 8px; background: var(--accent); position: relative; flex: none; }
.mark::after { content: ""; position: absolute; inset: 8px 7px 6px; background: #fff; clip-path: polygon(0 0, 100% 0, 50% 100%); }
header nav { margin-left: auto; display: flex; gap: 16px; font-size: 14px; }
main { max-width: 820px; margin: 0 auto 48px; padding: 32px 28px; background: var(--surface); border: 1px solid var(--border); border-radius: 18px; }
h1 { margin: 0 0 4px; font-size: 28px; }
.updated { color: var(--muted); margin: 0 0 24px; font-size: 14px; }
h2 { font-size: 18px; margin: 28px 0 8px; }
ul { padding-left: 22px; }
li { margin: 4px 0; }
.credit { text-align: center; color: var(--muted); font-size: 13px; padding: 0 16px 32px; }
.credit a { color: var(--muted); }
.note { color: var(--muted); font-size: 14px; border-top: 1px solid var(--border); margin-top: 32px; padding-top: 16px; }
@media (max-width: 600px) {
  main { margin: 0 0 32px; border-radius: 0; border-left: 0; border-right: 0; padding: 24px 16px; }
  h1 { font-size: 24px; }
}