:root{--ink:#171717;--mu:#5f6b7a;--line:#e3e8ef;--ac:#0070f3;--bg:#f6f8fb}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif}
header{background:#fff;border-bottom:1px solid var(--line)}
.wrap{max-width:860px;margin:0 auto;padding:0 20px}
header .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{font-weight:700;letter-spacing:-.01em;text-decoration:none;color:var(--ink);display:flex;align-items:center;gap:10px}
.brand i{width:22px;height:22px;border-radius:7px;background:var(--ac);display:inline-block}
nav a{color:var(--mu);text-decoration:none;margin-left:18px;font-size:14px}
nav a:hover{color:var(--ink)}
main{padding:40px 0 60px}
h1{font-size:32px;letter-spacing:-.02em;margin:0 0 6px}
.meta{color:var(--mu);font-size:14px;margin-bottom:28px}
h2{font-size:20px;margin:30px 0 8px}
p,li{color:#2b3440}
.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:28px 30px;box-shadow:0 1px 3px rgba(15,23,42,.05)}
.callout{background:#eef4ff;border:1px solid #cfe0ff;border-radius:10px;padding:14px 16px;margin:18px 0}
footer{color:var(--mu);font-size:13px;padding:20px 0 40px}
footer a{color:var(--mu)}
.hero{text-align:center;padding:60px 0 30px}
.hero h1{font-size:40px}
.hero p{font-size:18px;color:var(--mu);max-width:560px;margin:10px auto 0}
.links{display:flex;gap:12px;justify-content:center;margin-top:26px;flex-wrap:wrap}
.links a{display:inline-block;padding:10px 16px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--ink);text-decoration:none;font-weight:600;font-size:14px}