:root{--ink:#0f172a;--muted:#475569;--line:#e2e8f0;--bg:#f8fafc;--brand:#1e3a8a;--brand2:#2563eb}
*{box-sizing:border-box}
body{margin:0;font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:#fff}
a{color:var(--brand2)}
.wrap{max-width:1040px;margin:0 auto;padding:0 20px}
header{border-bottom:1px solid var(--line);background:#fff}
header .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-weight:700;font-size:20px;color:var(--brand);text-decoration:none;letter-spacing:-.01em}
.logo span{color:var(--brand2)}
nav a{margin-left:20px;color:var(--muted);text-decoration:none;font-size:15px}
nav a:hover{color:var(--ink)}
.hero{background:linear-gradient(180deg,#eff6ff,#fff);padding:64px 0 40px}
.hero h1{font-size:40px;line-height:1.15;margin:0 0 14px;letter-spacing:-.02em}
.hero p{font-size:19px;color:var(--muted);max-width:680px;margin:0}
section{padding:40px 0}
h2{font-size:26px;margin:0 0 8px}
.sub{color:var(--muted);margin:0 0 24px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:18px}
.card{border:1px solid var(--line);border-radius:12px;padding:22px;background:#fff;display:flex;flex-direction:column}
.card h3{margin:0 0 6px;font-size:18px}
.card p{margin:0 0 12px;color:var(--muted);font-size:15px}
.card ul{margin:0 0 14px;padding-left:18px;font-size:14px}
.price{font-size:28px;font-weight:700;margin-top:auto}
.price small{font-size:14px;font-weight:400;color:var(--muted)}
.free{font-size:13px;color:var(--muted);margin:4px 0 10px}
.card .links{font-size:14px}
.band{background:var(--bg);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:24px}
.cols h3{margin:0 0 6px;font-size:17px}
.cols p{margin:0;color:var(--muted);font-size:15px}
.doc{max-width:780px;padding:40px 20px 56px}
.doc h1{font-size:32px;margin:0 0 6px;letter-spacing:-.01em}
.doc h2{font-size:21px;margin:30px 0 8px}
.doc h3{font-size:17px;margin:20px 0 6px}
.doc code{background:var(--bg);border:1px solid var(--line);border-radius:4px;padding:0 4px;font-size:14px}
.meta{color:var(--muted);font-size:14px}
footer{border-top:1px solid var(--line);padding:26px 0;color:var(--muted);font-size:14px}
footer a{color:var(--muted);margin-right:16px}
.note{font-size:13px;color:var(--muted)}
@media(max-width:600px){.hero h1{font-size:30px}nav a{margin-left:12px}}