:root {
  --bg: #ffffff; --fg: #1d1d1f; --muted: #6e6e73; --card: #f5f5f7; --line: #d2d2d7;
  --accent: #0a6cff; --key: #202020; --key-fg: #fcfcfc;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #000000; --fg: #f5f5f7; --muted: #a1a1a6; --card: #1c1c1e; --line: #38383a; --accent: #4da3ff; --key: #fcfcfc; --key-fg: #202020; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Apple SD Gothic Neo", "Segoe UI", sans-serif; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 720px; margin: 0 auto; padding: 0 20px; }
header.site { display: flex; align-items: center; justify-content: space-between; padding: 20px 0; }
header.site .brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--fg); }
header.site .brand:hover { text-decoration: none; }
header.site nav { display: flex; gap: 20px; font-size: 15px; }
header.site nav a { color: var(--muted); }
header.site nav a:hover { color: var(--fg); text-decoration: none; }
.logo { width: 26px; height: 26px; }
.hero { text-align: center; padding: 56px 0 40px; }
.hero h1 { font-size: clamp(34px, 7vw, 52px); line-height: 1.1; margin: 28px 0 14px; letter-spacing: -0.02em; }
.hero p.lead { font-size: 20px; color: var(--muted); max-width: 520px; margin: 0 auto 28px; }
.keys { display: inline-flex; gap: 10px; }
.key { background: var(--key); color: var(--key-fg); border-radius: 16px; min-width: 64px; height: 64px; padding: 0 20px; display: inline-flex; align-items: center; justify-content: center; font: 600 26px/1 ui-rounded, -apple-system, sans-serif; box-shadow: 0 6px 14px rgba(0,0,0,.18); }
.badge { display: inline-block; margin-top: 8px; padding: 10px 22px; border-radius: 980px; background: var(--card); color: var(--muted); font-size: 15px; }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px; margin: 24px 0 48px; }
.feature { background: var(--card); border-radius: 18px; padding: 20px; }
.feature h3 { margin: 0 0 6px; font-size: 17px; }
.feature p { margin: 0; color: var(--muted); font-size: 15px; }
main.doc { padding: 12px 0 56px; }
main.doc h1 { font-size: 34px; letter-spacing: -0.02em; margin: 20px 0 6px; }
main.doc h2 { font-size: 21px; margin: 34px 0 8px; }
main.doc p, main.doc li { color: var(--fg); }
main.doc .meta { color: var(--muted); font-size: 15px; margin-bottom: 24px; }
main.doc ul { padding-left: 22px; }
main.doc li { margin: 6px 0; }
.note { background: var(--card); border-radius: 14px; padding: 14px 18px; margin: 18px 0; }
details { background: var(--card); border-radius: 14px; padding: 14px 18px; margin: 10px 0; }
details summary { cursor: pointer; font-weight: 600; }
details p { margin: 10px 0 0; color: var(--muted); }
footer.site { border-top: 1px solid var(--line); padding: 22px 0 40px; color: var(--muted); font-size: 14px; display: flex; flex-wrap: wrap; gap: 8px 20px; justify-content: space-between; }
footer.site a { color: var(--muted); }
.lang { font-size: 14px; }