:root{--bg:#fff;--fg:#1f2933;--muted:#616e7c;--accent:#2f6fed;--accent-soft:#eaf1ff;--line:#e4e7eb}
@media (prefers-color-scheme:dark){:root{--bg:#12161c;--fg:#e8ecf1;--muted:#9aa5b1;--accent:#6b9bff;--accent-soft:#1c2740;--line:#2a313b}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.8 system-ui,"Hiragino Sans","Noto Sans JP",sans-serif}
a{color:var(--accent)}
.wrap{max-width:880px;margin:0 auto;padding:0 16px}
header.site{border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;justify-content:space-between;align-items:center;padding-top:14px;padding-bottom:14px}
header.site a.brand{font-weight:700;color:var(--fg);text-decoration:none}
header.site nav a{margin-left:16px;font-size:14px}
.hero{padding:56px 0 40px}
.hero h1{font-size:clamp(26px,5vw,38px);line-height:1.4;margin:0 0 16px}
.hero p{color:var(--muted);margin:0 0 24px}
.hero img{display:block;max-width:100%;height:auto;border-radius:12px}
.hero .btn{margin-bottom:32px}
.btn{display:inline-block;background:var(--accent);color:#fff;padding:10px 22px;border-radius:8px;text-decoration:none;font-weight:600}
section{padding:36px 0;border-top:1px solid var(--line)}
section h2{font-size:22px;margin:0 0 20px}
.grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.card{background:var(--accent-soft);border-radius:12px;padding:18px}
.card h3{margin:0 0 6px;font-size:17px}
.card p{margin:0;color:var(--muted);font-size:15px}
dl.info{display:grid;grid-template-columns:8em 1fr;gap:8px 16px;margin:0}
dl.info dt{color:var(--muted)}
dl.info dd{margin:0}
footer.site{border-top:1px solid var(--line);padding:24px 0;color:var(--muted);font-size:14px}
footer.site a{margin-right:16px}
main.doc{padding:40px 0}
main.doc h1{font-size:28px}
main.doc h2{font-size:20px;margin-top:32px}
.card img{display:block;width:48px;height:48px;border-radius:12px;margin-bottom:10px}