:root{color-scheme:dark;--ink:#edf4ff;--muted:#afc0d9;--line:#42516e;--card:#142541}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:radial-gradient(circle at 60% -12%,#356c94 0,#183e65 28%,#0b1937 65%,#09152d 100%);line-height:1.75}
main{width:min(920px,calc(100% - 36px));margin:0 auto;padding:32px 0 90px}header{display:flex;align-items:center;justify-content:space-between;gap:20px;padding-bottom:32px}header a,footer a{color:var(--ink);text-decoration:none}header nav{display:flex;gap:22px;font-size:14px}a:hover{text-decoration:underline}
.brand{font-size:19px;font-weight:700;letter-spacing:.08em}.moon{display:inline-block;margin-right:7px;color:#cbe6ff}.hero{padding:72px 0 82px;max-width:690px}.eyebrow{font-size:13px;color:#bcd8ec;letter-spacing:.18em}.hero h1{font-size:clamp(42px,8vw,76px);line-height:1.14;letter-spacing:-.035em;margin:16px 0 24px}.hero p{font-size:19px;color:var(--muted);max-width:570px}.pill{display:inline-block;border:1px solid #91c6e8;border-radius:100px;padding:9px 20px;margin-top:14px;color:#d4edff;font-size:14px}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.card,.document{background:rgba(20,37,65,.83);border:1px solid var(--line);border-radius:20px;padding:25px;box-shadow:0 16px 40px #030c1c30}.card h2{margin:0 0 10px;font-size:21px}.card p{color:var(--muted);margin:0;font-size:14px}.document{padding:clamp(22px,5vw,52px)}.document h1{font-size:clamp(31px,5vw,48px);line-height:1.25}.document h2{font-size:21px;margin:30px 0 7px}.document p,.document li{color:#d0dced}.document ul{padding-left:22px}.document .meta{color:var(--muted);font-size:14px}.document a{color:#a9dcff}footer{border-top:1px solid var(--line);padding:30px 0;margin-top:60px;display:flex;justify-content:space-between;gap:18px;color:var(--muted);font-size:13px;flex-wrap:wrap}footer div{display:flex;gap:17px}
@media(max-width:700px){.grid{grid-template-columns:1fr}.hero{padding:40px 0 55px}header nav{gap:10px;font-size:12px}}