:root{--bg:#f7f8fa;--fg:#12161c;--muted:#5b6674;--accent:#2f6df6;--line:#e3e7ee}
*{box-sizing:border-box}
body{margin:0;font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--fg);background:var(--bg)}
.wrap{max-width:960px;margin:0 auto;padding:0 24px}
header{border-bottom:1px solid var(--line);background:#fff}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{font-weight:700;font-size:19px;letter-spacing:-.2px;text-decoration:none;color:var(--fg)}
.brand span{color:var(--accent)}
nav a{margin-left:26px;color:var(--muted);text-decoration:none;font-size:15px}
nav a:hover,nav a.on{color:var(--fg)}
.hero{padding:76px 0 56px}
.hero h1{font-size:40px;line-height:1.2;margin:0 0 18px;letter-spacing:-1px}
.hero p{font-size:18px;color:var(--muted);max-width:640px;margin:0}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px;padding-bottom:56px}
.card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:24px}
.card h3{margin:0 0 8px;font-size:17px}
.card p{margin:0;color:var(--muted);font-size:15px}
main h2{font-size:26px;margin:48px 0 16px;letter-spacing:-.4px}
main p{color:#2b3440;max-width:720px}
ul.plain{padding-left:20px;color:#2b3440}
ul.plain li{margin:6px 0}
footer{border-top:1px solid var(--line);background:#fff;margin-top:56px}
footer .wrap{display:flex;justify-content:space-between;padding:22px 24px;color:var(--muted);font-size:14px}
a{color:var(--accent)}
@media(max-width:640px){.hero h1{font-size:30px}nav a{margin-left:16px}}