:root{--bg:#F3F1F6;--fg:#1E2430;--mut:#5b6474;--card:#fff;--line:#e2dfe8;--pri:#3F5F90;--ink:#1E334C}
@media (prefers-color-scheme:dark){:root{--bg:#121820;--fg:#e6e9ef;--mut:#9aa3b2;--card:#1a2230;--line:#263043;--pri:#8fb0e0;--ink:#0d131b}}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font:16px/1.65 system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--fg)}
a{color:var(--pri)}.wrap{max-width:1040px;margin:0 auto;padding:0 20px}
header{position:sticky;top:0;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);z-index:5}
nav{display:flex;align-items:center;gap:20px;height:60px}.brand{display:flex;gap:10px;align-items:center;font-weight:700;text-decoration:none;color:var(--fg)}
.brand img{width:28px}.links{display:flex;gap:18px;margin-left:auto}.links a{color:var(--mut);text-decoration:none;font-size:15px}
#lang{border:1px solid var(--line);background:var(--card);color:var(--fg);border-radius:8px;padding:5px 10px;cursor:pointer}
.hero{padding:88px 0 64px;text-align:center}.hero h1{font-size:clamp(32px,6vw,54px);line-height:1.15;margin:0 0 16px;letter-spacing:-.02em}
.hero p{color:var(--mut);font-size:19px;max-width:640px;margin:0 auto 32px}
.btn{display:inline-block;background:var(--pri);color:#fff;padding:14px 28px;border-radius:12px;text-decoration:none;font-weight:600}
@media (prefers-color-scheme:dark){.btn{color:#0d131b}}
.badge{display:inline-block;margin-top:14px;font-size:13px;color:#a05a00;background:#fff3df;border:1px solid #f0d3a0;border-radius:99px;padding:3px 12px}
.meta{font-size:13px;color:var(--mut);margin-top:8px}
section{padding:56px 0}h2{font-size:28px;margin:0 0 28px;text-align:center}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px}.card h3{margin:0 0 6px;font-size:18px}.card p{margin:0;color:var(--mut);font-size:15px}
.step b{display:inline-grid;place-items:center;width:32px;height:32px;border-radius:50%;background:var(--pri);color:#fff;margin-bottom:10px}
details{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin-bottom:10px}summary{cursor:pointer;font-weight:600}details p{color:var(--mut);margin:8px 0 0}
footer{border-top:1px solid var(--line);padding:28px 0;color:var(--mut);font-size:14px;text-align:center}
@media (max-width:640px){.links{display:none}#lang{margin-left:auto}.hero{padding:56px 0 40px}}