:root {
  --bg: #ffffff;
  --surface: #f7f7f8;
  --text: #141418;
  --muted: #52525b;
  --border: #e4e4e7;
  --accent: #4f46e5;
  --accent-soft: #eef2ff;
  --accent-text: #ffffff;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0c0f;
    --surface: #141418;
    --text: #f7f7f8;
    --muted: #a1a1aa;
    --border: #26262d;
    --accent: #818cf8;
    --accent-soft: #1e1b4b;
    --accent-text: #0c0c0f;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
.narrow { max-width: 760px; }

header.top { border-bottom: 1px solid var(--border); }
header.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 18px; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
nav.links { display: flex; align-items: center; gap: 16px; font-size: 15px; }
nav.links a { color: var(--muted); text-decoration: none; }
nav.links a:hover { color: var(--text); }

.btn {
  display: inline-block; padding: 10px 18px; border-radius: 10px;
  background: var(--accent); color: var(--accent-text) !important;
  text-decoration: none; font-weight: 600;
}
.btn.ghost { background: transparent; color: var(--text) !important; border: 1px solid var(--border); }

main.doc { padding: 40px 0 64px; }
main.doc h1 { font-size: 34px; line-height: 1.2; margin: 0 0 8px; }
main.doc .meta { color: var(--muted); margin: 0 0 32px; }
main.doc h2 { font-size: 21px; margin: 36px 0 8px; }
main.doc h3 { font-size: 17px; margin: 24px 0 4px; }
main.doc ul, main.doc ol { padding-left: 22px; }
main.doc li { margin: 4px 0; }
.note { background: var(--accent-soft); border-radius: 12px; padding: 16px 18px; margin: 24px 0; }

footer.bottom { border-top: 1px solid var(--border); color: var(--muted); font-size: 14px; }
footer.bottom .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; padding-top: 24px; padding-bottom: 32px; }
footer.bottom a { color: var(--muted); }
footer.bottom nav { display: flex; flex-wrap: wrap; gap: 16px; }

@media (max-width: 600px) {
  nav.links .hide-sm { display: none; }
  main.doc h1 { font-size: 28px; }
}