:root{--brand:#0a84c6;--brand-dark:#0869a0;--ink:#2b2f38;--sub:#5f6472;--line:#e7e9ef;--bg:#f4f6f9;--card:#fff;}
*{box-sizing:border-box;}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",PingFang SC,"Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink);line-height:1.7;}
img{max-width:100%;}a{color:var(--brand);text-decoration:none;}a:hover{color:var(--brand-dark);text-decoration:underline;}
.container{max-width:1140px;margin:auto;padding:0 20px;}
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50;}
.nav-flex{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;max-width:1140px;margin:auto;}
.logo{display:flex;align-items:center;gap:9px;font-weight:800;color:var(--ink);font-size:18px;}
.logo:hover{text-decoration:none;color:var(--ink);}
.logo-mark{width:30px;height:30px;border-radius:8px;background:var(--brand);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:16px;}
.logo-light{color:#fff;}
.primary-nav{display:flex;gap:20px;} .primary-nav a{color:var(--ink);font-size:15px;font-weight:500;} .primary-nav a:hover{color:var(--brand);text-decoration:none;}
.hero{padding:70px 0 50px;background:linear-gradient(135deg,#eef6fd,#fbfcfe);}
.hero-inner{display:grid;grid-template-columns:1.3fr .9fr;gap:40px;align-items:center;}
.hero h1{font-size:44px;line-height:1.2;margin:0 0 18px;} .hero p.lead{font-size:18px;color:var(--sub);margin:0 0 26px;}
.btn{display:inline-block;background:var(--brand);color:#fff;padding:13px 24px;border-radius:10px;font-weight:700;margin-right:12px;}
.btn:hover{background:var(--brand-dark);text-decoration:none;color:#fff;}
.btn.ghost{background:#fff;color:var(--brand);border:1px solid var(--brand);}
.hero-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:26px;box-shadow:0 10px 30px rgba(10,132,198,.08);}
.hero-card h3{margin:0 0 14px;font-size:18px;} .hero-card ul{margin:0;padding-left:20px;} .hero-card li{margin-bottom:8px;font-size:14px;color:var(--sub);}
section.block{padding:56px 0;} section.alt{background:#fff;}
h2.sec{font-size:28px;margin:0 0 12px;} p.sec-sub{color:var(--sub);margin:0 0 30px;max-width:780px;}
.grid{display:grid;gap:22px;} .grid-3{grid-template-columns:repeat(3,1fr);} .grid-2{grid-template-columns:repeat(2,1fr);} .grid-4{grid-template-columns:repeat(4,1fr);}
.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px;} .card h3{margin:0 0 10px;font-size:19px;color:var(--brand-dark);} .card p{margin:0;color:var(--sub);font-size:14px;}
.steps{display:grid;gap:18px;counter-reset:st;} .step{background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px 24px 24px 70px;position:relative;}
.step:before{counter-increment:st;content:"第 "counter(st)" 步";position:absolute;left:20px;top:24px;background:var(--brand);color:#fff;font-size:13px;font-weight:700;padding:6px 10px;border-radius:8px;}
.step h3{margin:0 0 8px;font-size:18px;} .step p{margin:0;color:var(--sub);}
.toc{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px 24px;margin-bottom:30px;} .toc strong{display:block;margin-bottom:10px;} .toc a{margin-right:18px;font-size:14px;}
table.data{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;font-size:14px;}
table.data th,table.data td{padding:12px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top;} table.data th{background:#eef6fd;color:var(--brand-dark);font-weight:700;} table.data tr:last-child td{border-bottom:0;}
.callout{background:#eef6fd;border-left:4px solid var(--brand);padding:18px 22px;border-radius:10px;margin:24px 0;} .callout.warn{background:#fff6ec;border-left-color:#e0912c;} .callout h4{margin:0 0 8px;} .callout p{margin:0;font-size:14px;color:var(--sub);}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px 24px;margin-bottom:16px;} .faq-item h3{margin:0 0 12px;font-size:17px;color:var(--brand-dark);} .faq-item ol{padding-left:22px;margin:0;} .faq-item li{margin-bottom:6px;font-size:14px;color:var(--sub);}
.platform{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;} .platform .card h3{font-size:17px;}
.checklist{list-style:none;padding:0;margin:0;} .checklist li{padding:10px 0 10px 34px;position:relative;border-bottom:1px dashed var(--line);font-size:15px;} .checklist li:before{content:"✓";position:absolute;left:0;top:10px;color:#fff;background:var(--brand);width:20px;height:20px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-size:12px;}
.scenarios .card h3{color:var(--ink);}
.site-footer{background:#1f242f;color:#c7cbd6;padding:50px 0 20px;margin-top:50px;} .footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;} .footer-grid h4{color:#fff;margin:0 0 14px;} .footer-links{list-style:none;padding:0;margin:0;} .footer-links li{margin-bottom:9px;} .footer-links a{color:#c7cbd6;} .footer-links a:hover{color:#fff;}
.footer-base{display:flex;justify-content:space-between;font-size:13px;color:#8b909c;border-top:1px solid #2c323f;margin-top:30px;padding-top:18px;}
@media(max-width:900px){.hero-inner,.grid-3,.grid-2,.grid-4,.platform,.footer-grid{grid-template-columns:1fr;}.hero h1{font-size:34px;}.primary-nav{display:none;}}