:root{--ink:#102a3f;--muted:#667985;--teal:#079baa;--teal-dark:#087783;--ice:#e5f8f8;--line:#dce8e9;--paper:#fbfdfd;--night:#102b3a}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.65}body[data-language="zh"] .lang-en,body:not([data-language="zh"]) .lang-zh{display:none!important}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.shell{width:min(1120px,calc(100% - 40px));margin:auto}.site-header{position:sticky;top:0;z-index:20;border-bottom:1px solid rgba(220,232,233,.85);background:rgba(251,253,253,.94);backdrop-filter:blur(18px)}.nav{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:10px;font-size:1.2rem;font-weight:800;letter-spacing:-.03em}.brand 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0}.section-heading{max-width:720px}.section-heading.center{text-align:center;margin:auto}.section h2,.page-content h2{margin:0;font-size:clamp(2.15rem,4.8vw,4rem);line-height:1.08;letter-spacing:-.05em}.section-intro{color:var(--muted);font-size:1.08rem}.steps,.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:54px}.card{padding:28px;border:1px solid var(--line);border-radius:24px;background:#fff;box-shadow:0 18px 44px rgba(16,42,63,.05)}.card-number{display:grid;place-items:center;width:48px;height:48px;border-radius:15px;background:var(--ice);color:var(--teal-dark);font-weight:800}.card h3{margin:30px 0 9px;font-size:1.22rem}.card p{margin:0;color:var(--muted)}.dark-section{background:var(--night);color:#fff}.dark-section .eyebrow{color:#60d5db}.dark-section .card{border-color:rgba(255,255,255,.12);background:rgba(255,255,255,.05);box-shadow:none}.dark-section .card p{color:#bdcad0}.notice{margin-top:26px;padding:20px 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0;color:var(--muted);font-size:.9rem}.footer-links{display:flex;gap:22px;flex-wrap:wrap}.page-hero{padding:76px 0 52px;max-width:820px}.page-hero h1{font-size:clamp(3rem,6vw,5.1rem)}.updated{display:inline-block;margin-top:17px;padding:7px 12px;border-radius:999px;background:var(--ice);color:var(--teal-dark);font-size:.82rem;font-weight:750}.page-layout{display:grid;grid-template-columns:220px minmax(0,780px);gap:66px;padding-bottom:110px}.toc{position:sticky;top:105px;align-self:start;display:grid;gap:8px;font-size:.9rem}.toc a{padding:6px 0;color:var(--muted)}.toc a:hover{color:var(--teal-dark)}.legal-section{scroll-margin-top:100px;padding-bottom:42px;margin-bottom:42px;border-bottom:1px solid var(--line)}.legal-section:last-child{border-bottom:0}.legal-section h2{font-size:1.55rem;letter-spacing:-.03em}.legal-section h3{margin-top:28px}.legal-section p,.legal-section li{color:#566c78}.legal-section a,.contact-card 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1fr;padding:38px;gap:38px}.page-layout{grid-template-columns:1fr;gap:28px}.toc{position:static;display:flex;flex-wrap:wrap;gap:6px 18px;padding-bottom:20px;border-bottom:1px solid var(--line)}}@media(max-width:600px){.shell{width:min(100% - 30px,560px)}.nav{align-items:flex-start;padding:13px 0;flex-wrap:wrap}.menu{width:100%;order:2;padding:6px 0 2px}.hero{padding:60px 0 80px}.hero h1{font-size:clamp(3rem,15vw,4.5rem)}.actions{flex-direction:column}.primary-button{width:100%}.hero-art{min-height:500px}.hero-art img{width:235px}.section{padding:82px 0}.phone-grid{grid-template-columns:1fr;gap:52px}.pro{display:block;margin-bottom:80px;padding:28px 23px}.pro img{width:105px;margin-bottom:30px}.help-grid{grid-template-columns:1fr}.page-hero{padding-top:54px}.page-hero h1{font-size:3.25rem}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}