:root{--bg:#f7f8fb;--card:#ffffff;--text:#182033;--muted:#667085;--line:#e7eaf1;--brand:#2563eb;--brand2:#7c3aed;--soft:#eef4ff;--shadow:0 16px 40px rgba(18,32,54,.08)}
*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.75}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.container{width:min(1180px,92vw);margin:auto}.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.nav-wrap{display:flex;gap:22px;align-items:center;justify-content:space-between;padding:14px 0}.logo{display:inline-flex;align-items:center;gap:10px;font-weight:800;font-size:22px}.logo img{width:44px;height:44px;border-radius:14px}.nav{display:flex;gap:14px;flex-wrap:wrap;justify-content:flex-end;font-size:14px}.nav a{padding:7px 10px;border-radius:999px;color:#344054}.nav a:hover{background:var(--soft);color:var(--brand)}.search-row{display:flex;gap:10px;padding:0 0 14px}.search-row input{flex:1;border:1px solid var(--line);border-radius:14px;padding:13px 16px;font-size:15px}.search-row button,.btn{border:0;border-radius:14px;padding:13px 18px;background:linear-gradient(135deg,var(--brand),var(--brand2));color:white;font-weight:700;cursor:pointer}.search-tip{margin:0;align-self:center;color:var(--muted);font-size:14px}.hero{padding:58px 0 38px;background:radial-gradient(circle at top left,#dbeafe,transparent 34%),linear-gradient(180deg,#fff,#f7f8fb)}.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:34px;align-items:center}.eyebrow{display:inline-flex;gap:8px;align-items:center;background:#eaf2ff;color:#1d4ed8;border-radius:999px;padding:6px 12px;font-weight:700;font-size:14px}.hero h1{font-size:clamp(34px,5vw,60px);line-height:1.12;margin:18px 0}.hero p{color:var(--muted);font-size:18px}.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.btn.secondary{background:white;color:var(--brand);border:1px solid #c7d7fe}.hero-card{background:white;border:1px solid var(--line);border-radius:28px;padding:16px;box-shadow:var(--shadow)}.hero-card figure{margin:0;position:relative}.hero-card img{border-radius:22px;aspect-ratio:4/3;object-fit:cover}.domain-pill{position:absolute;left:16px;bottom:16px;background:rgba(255,255,255,.92);padding:8px 12px;border-radius:999px;font-weight:700;color:#1d4ed8}.section{padding:54px 0}.section-head{display:flex;justify-content:space-between;gap:20px;align-items:flex-end;margin-bottom:22px}.section h2{font-size:clamp(26px,3vw,38px);margin:0}.section-head p{max-width:650px;color:var(--muted);margin:8px 0 0}.grid{display:grid;gap:18px}.grid.cols-3{grid-template-columns:repeat(3,1fr)}.grid.cols-2{grid-template-columns:repeat(2,1fr)}.card{background:var(--card);border:1px solid var(--line);border-radius:24px;padding:22px;box-shadow:0 8px 22px rgba(18,32,54,.04)}.card .icon{font-size:30px}.card h3{margin:10px 0 6px;font-size:20px}.card p{color:var(--muted);margin:0}.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.video-card{background:white;border:1px solid var(--line);border-radius:24px;overflow:hidden;box-shadow:0 8px 22px rgba(18,32,54,.04)}.video-card figure{position:relative;margin:0;overflow:hidden}.video-card img{width:100%;aspect-ratio:16/10;object-fit:cover;transition:transform .35s ease}.video-card:hover img{transform:scale(1.05)}.play-button{position:absolute;inset:0;margin:auto;width:62px;height:62px;border-radius:50%;border:0;background:rgba(37,99,235,.92);color:white;font-size:24px;opacity:0;transform:scale(.88);transition:.25s;cursor:pointer}.video-card:hover .play-button{opacity:1;transform:scale(1)}figcaption{font-size:12px;color:#fff;background:linear-gradient(transparent,rgba(0,0,0,.62));position:absolute;left:0;right:0;bottom:0;padding:28px 12px 10px}.video-body{padding:18px}.tag{display:inline-block;background:#eef4ff;color:#1d4ed8;border-radius:999px;padding:4px 10px;font-size:12px;font-weight:700}.metrics{display:flex;gap:12px;flex-wrap:wrap;margin-top:14px;color:#475467;font-size:13px}.steps{counter-reset:step}.step{display:grid;grid-template-columns:56px 1fr;gap:14px;align-items:start}.step b{width:56px;height:56px;border-radius:18px;background:#eef4ff;color:var(--brand);display:grid;place-items:center}.timeline{border-left:3px solid #dbeafe;padding-left:22px}.timeline .card{margin-bottom:14px}.faq details{background:white;border:1px solid var(--line);border-radius:18px;padding:16px 18px}.faq details+details{margin-top:12px}.faq summary{cursor:pointer;font-weight:800}.faq p{color:var(--muted)}.review{display:flex;gap:14px}.avatar{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,#dbeafe,#ede9fe);display:grid;place-items:center;font-weight:800;color:#1d4ed8}.breadcrumb{padding:20px 0 0;color:var(--muted);font-size:14px}.breadcrumb a{color:var(--brand)}.breadcrumb span{margin:0 6px}.page-hero{padding:42px 0 22px}.page-hero h1{font-size:42px;line-height:1.2;margin:12px 0}.page-hero p{max-width:760px;color:var(--muted);font-size:18px}.site-footer{background:#101828;color:white;padding:44px 0;margin-top:50px}.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:24px}.site-footer p{color:#cbd5e1}.site-footer h2{font-size:18px}.footer-logo img{width:42px;height:42px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}.json-block{background:#0b1220;color:#d6e4ff;border-radius:20px;padding:18px;overflow:auto;font-size:13px}.share-box{display:flex;gap:12px;flex-wrap:wrap}.share-box button{border:1px solid var(--line);background:white;border-radius:14px;padding:12px 14px;cursor:pointer}.notice{background:#fff7ed;border:1px solid #fed7aa;color:#9a3412;border-radius:18px;padding:14px 16px}@media (max-width:920px){.hero-grid,.grid.cols-3,.grid.cols-2,.video-grid,.footer-grid{grid-template-columns:1fr}.nav-wrap{align-items:flex-start;flex-direction:column}.search-row{flex-direction:column}.section-head{display:block}.hero{padding-top:36px}.page-hero h1{font-size:34px}}@media (max-width:560px){.container{width:min(94vw,1180px)}.nav a{font-size:13px;padding:6px 8px}.cta-row .btn{width:100%;text-align:center}.video-body{padding:15px}.section{padding:38px 0}.hero h1{font-size:34px}}