:root{
  --yellow:#FFD400;
  --yellow-deep:#FFC400;
  --ink:#111318;
  --ink-soft:#3a3f47;
  --gray:#6b7280;
  --line:#e8e9ec;
  --bg:#ffffff;
  --bg-soft:#fafafa;
  --radius:16px;
  --shadow:0 8px 30px rgba(17,19,24,.08);
  --shadow-y:0 14px 40px rgba(255,196,0,.28);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit}
img{max-width:100%;height:auto;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.section{padding:84px 0}
.section-soft{background:var(--bg-soft)}
.eyebrow{display:inline-block;font-size:13px;font-weight:700;letter-spacing:1px;color:#8a6d00;background:var(--yellow);padding:5px 14px;border-radius:999px;margin-bottom:16px}
h2.sec-title{font-size:clamp(24px,3.4vw,38px);line-height:1.25;font-weight:800;letter-spacing:-.5px}
.sec-desc{color:var(--gray);font-size:16px;max-width:720px;margin-top:14px}
.center{text-align:center}
.center .sec-desc{margin-left:auto;margin-right:auto}

/* NAV */
.nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:70px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px;white-space:nowrap}
.brand .ai-page-logo{height:34px;width:auto}
.nav-links{display:flex;align-items:center;gap:0;list-style:none}
.nav-links li a{display:block;padding:8px 13px;font-size:15px;font-weight:600;color:var(--ink-soft);border-radius:8px;transition:.2s}
.nav-links li a:hover{color:#000;background:var(--yellow)}
.nav-cta{display:flex;align-items:center;gap:10px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:700;border-radius:10px;cursor:pointer;transition:transform .18s,box-shadow .18s,background .18s;border:none;font-size:15px;text-align:center}
.btn-primary{background:var(--yellow);color:#1a1a1a;padding:12px 24px;box-shadow:var(--shadow-y)}
.btn-primary:hover{transform:translateY(-2px);background:var(--yellow-deep)}
.btn-dark{background:var(--ink);color:#fff;padding:12px 24px}
.btn-dark:hover{transform:translateY(-2px);background:#000}
.btn-ghost{background:transparent;color:var(--ink);padding:12px 24px;border:2px solid var(--ink)}
.btn-ghost:hover{background:var(--ink);color:#fff}
.burger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.burger span{width:24px;height:2.5px;background:var(--ink);border-radius:2px;transition:.2s}

/* HERO (no images) */
.hero{position:relative;overflow:hidden;background:linear-gradient(160deg,#fffdf2 0%,#fff9d6 40%,#fffdf5 100%)}
.hero::before{content:"";position:absolute;top:-160px;right:-120px;width:520px;height:520px;border-radius:50%;background:radial-gradient(circle,rgba(255,212,0,.55),transparent 70%);pointer-events:none}
.hero::after{content:"";position:absolute;bottom:-200px;left:-140px;width:460px;height:460px;border-radius:50%;background:radial-gradient(circle,rgba(255,196,0,.35),transparent 70%);pointer-events:none}
.hero-inner{position:relative;z-index:2;padding:88px 0 76px;display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:#fff;border:1px solid #ffe27a;padding:7px 16px;border-radius:999px;font-size:13.5px;font-weight:700;box-shadow:0 4px 16px rgba(255,196,0,.2)}
.hero-badge .dot{width:8px;height:8px;border-radius:50%;background:#22c55e;box-shadow:0 0 0 0 rgba(34,197,94,.6);animation:pulse 2s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(34,197,94,.5)}70%{box-shadow:0 0 0 10px rgba(34,197,94,0)}100%{box-shadow:0 0 0 0 rgba(34,197,94,0)}}
.hero h1{font-size:clamp(30px,4.4vw,52px);line-height:1.14;font-weight:900;letter-spacing:-1px;margin:22px 0 20px}
.hero h1 em{font-style:normal;background:linear-gradient(transparent 62%,var(--yellow) 62%);padding:0 4px}
.hero p.lead{font-size:17px;color:var(--ink-soft);max-width:540px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:32px}
.hero-metrics{display:flex;flex-wrap:wrap;gap:30px;margin-top:40px;padding-top:30px;border-top:1px dashed #e6d886}
.hero-metrics .m b{display:block;font-size:26px;font-weight:900;letter-spacing:-.5px}
.hero-metrics .m span{font-size:13.5px;color:var(--gray)}
.hero-visual{position:relative;display:flex;flex-direction:column;gap:16px}
.hero-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px 22px;box-shadow:var(--shadow);transition:transform .3s}
.hero-card:hover{transform:translateY(-4px)}
.hero-card .hc-top{display:flex;justify-content:space-between;align-items:center;font-weight:800;font-size:15px}
.hero-card .hc-top .tag{background:#fff7cc;color:#8a6d00;font-size:12px;padding:3px 10px;border-radius:999px;font-weight:700}
.hero-bars{margin-top:14px;display:flex;flex-direction:column;gap:10px}
.hero-bar{height:10px;border-radius:6px;background:#f1f2f4;overflow:hidden}
.hero-bar i{display:block;height:100%;border-radius:6px;background:linear-gradient(90deg,var(--yellow),var(--yellow-deep));animation:grow 1.6s ease forwards;transform-origin:left}
@keyframes grow{from{transform:scaleX(0)}to{transform:scaleX(1)}}
.hero-mini{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.hero-mini .hm{background:#111318;color:#fff;border-radius:16px;padding:18px 20px}
.hero-mini .hm.b{background:var(--yellow);color:#1a1a1a}
.hero-mini .hm b{display:block;font-size:22px;font-weight:900}
.hero-mini .hm span{font-size:12.5px;opacity:.75}

/* METRIC CARDS */
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.metric-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;transition:transform .28s,box-shadow .28s,border-color .28s}
.metric-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--yellow)}
.metric-card .num{font-size:34px;font-weight:900;letter-spacing:-1px;color:var(--ink)}
.metric-card .num small{font-size:18px;color:var(--yellow-deep)}
.metric-card .lbl{font-weight:700;margin-top:4px}
.metric-card .sub{color:var(--gray);font-size:13.5px;margin-top:6px}

/* SERVICE CARDS */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.svc{padding:26px;border-radius:var(--radius);background:#fff;border:1px solid var(--line);transition:transform .28s,box-shadow .28s,border-color .28s;display:flex;flex-direction:column}
.svc:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--yellow)}
.svc .ico{width:46px;height:46px;border-radius:12px;background:#fff7cc;display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:16px}
.svc h3{font-size:18px;font-weight:800;margin-bottom:8px}
.svc p{color:var(--gray);font-size:14.5px}
.svc .tags{margin-top:14px;display:flex;flex-wrap:wrap;gap:8px}
.svc .tags span{font-size:12px;background:var(--bg-soft);border:1px solid var(--line);padding:3px 10px;border-radius:999px;color:var(--ink-soft)}

/* steps */
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;counter-reset:step}
.step{position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px 20px;transition:transform .28s}
.step:hover{transform:translateY(-5px);border-color:var(--yellow)}
.step .no{width:38px;height:38px;border-radius:50%;background:var(--yellow);color:#1a1a1a;display:flex;align-items:center;justify-content:center;font-weight:900;margin-bottom:14px}
.step h4{font-size:16px;font-weight:800;margin-bottom:6px}
.step p{font-size:13.5px;color:var(--gray)}

/* table */
.table-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--line);background:#fff}
table.cmp{width:100%;border-collapse:collapse;min-width:640px}
table.cmp th,table.cmp td{padding:15px 18px;text-align:left;border-bottom:1px solid var(--line);font-size:14.5px}
table.cmp thead th{background:#111318;color:#fff;font-weight:800;font-size:14px}
table.cmp thead th:first-child{border-top-left-radius:0}
table.cmp tbody tr:hover{background:#fffdf2}
table.cmp .good{color:#0a8f3c;font-weight:700}
table.cmp .mid{color:#c98a00;font-weight:700}

/* rating */
.rating-box{display:grid;grid-template-columns:auto 1fr;gap:32px;align-items:center;background:#111318;color:#fff;border-radius:22px;padding:40px}
.rating-score{text-align:center;padding:0 20px}
.rating-score .big{font-size:64px;font-weight:900;line-height:1;color:var(--yellow)}
.rating-score .stars{color:var(--yellow);font-size:22px;letter-spacing:2px;margin-top:8px}
.rating-score .out{color:#9aa3af;font-size:13px;margin-top:6px}
.rating-desc h3{font-size:26px;font-weight:900;margin-bottom:10px}
.rating-desc p{color:#c3c9d2;font-size:15px}
.rating-desc .chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.rating-desc .chips span{background:rgba(255,212,0,.14);border:1px solid rgba(255,212,0,.35);color:var(--yellow);padding:5px 13px;border-radius:999px;font-size:13px;font-weight:700}

/* reviews */
.review{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:transform .28s,box-shadow .28s}
.review:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.review .q{color:var(--gray);font-size:14.5px;line-height:1.75}
.review .who{display:flex;align-items:center;gap:12px;margin-top:18px;padding-top:16px;border-top:1px solid var(--line)}
.review .av{width:42px;height:42px;border-radius:50%;background:var(--yellow);display:flex;align-items:center;justify-content:center;font-weight:900;color:#1a1a1a}
.review .who b{display:block;font-size:14.5px}
.review .who span{font-size:12.5px;color:var(--gray)}
.review .stars{color:var(--yellow-deep);font-size:13px;margin-bottom:10px;letter-spacing:1px}

/* cases */
.case{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:transform .28s,box-shadow .28s}
.case:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.case .thumb{aspect-ratio:16/10;overflow:hidden;background:#f1f2f4}
.case .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.case:hover .thumb img{transform:scale(1.05)}
.case .body{padding:20px 22px}
.case .body span{font-size:12.5px;font-weight:700;color:#8a6d00;background:#fff7cc;padding:3px 10px;border-radius:999px}
.case .body h4{font-size:17px;font-weight:800;margin:12px 0 6px}
.case .body p{font-size:13.5px;color:var(--gray)}

/* tags cloud */
.cloud{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}
.cloud span{background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 18px;font-size:14px;font-weight:600;transition:.2s;cursor:default}
.cloud span:hover{background:var(--yellow);border-color:var(--yellow);transform:translateY(-2px)}

/* price */
.price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.price{background:#fff;border:2px solid var(--line);border-radius:var(--radius);padding:30px 26px;transition:transform .28s,border-color .28s,box-shadow .28s;display:flex;flex-direction:column}
.price:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.price.hot{border-color:var(--yellow);position:relative;box-shadow:var(--shadow-y)}
.price.hot::before{content:"推荐";position:absolute;top:-13px;right:24px;background:var(--yellow);color:#1a1a1a;font-size:12px;font-weight:800;padding:3px 14px;border-radius:999px}
.price h4{font-size:18px;font-weight:800}
.price .amt{font-size:38px;font-weight:900;margin:12px 0 4px;letter-spacing:-1px}
.price .amt small{font-size:15px;font-weight:600;color:var(--gray)}
.price ul{list-style:none;margin:18px 0;flex:1}
.price ul li{padding:7px 0;font-size:14px;color:var(--ink-soft);padding-left:24px;position:relative}
.price ul li::before{content:"✓";position:absolute;left:0;color:#0a8f3c;font-weight:900}

/* timeline */
.timeline{position:relative;padding-left:28px}
.timeline::before{content:"";position:absolute;left:7px;top:6px;bottom:6px;width:2px;background:var(--yellow)}
.timeline .tl{position:relative;padding-bottom:26px}
.timeline .tl::before{content:"";position:absolute;left:-28px;top:6px;width:16px;height:16px;border-radius:50%;background:var(--yellow);border:3px solid #fff;box-shadow:0 0 0 2px var(--yellow)}
.timeline .tl b{font-size:16px;font-weight:800}
.timeline .tl p{font-size:14px;color:var(--gray);margin-top:3px}

/* network */
.network{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.net-item{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px;font-weight:700;text-align:center;transition:.2s}
.net-item:hover{background:#111318;color:var(--yellow);transform:translateY(-3px)}
.net-item small{display:block;font-size:12px;font-weight:500;color:var(--gray);margin-top:2px}
.net-item:hover small{color:#c3c9d2}

/* FAQ */
.faq-item{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:12px;overflow:hidden;transition:border-color .2s}
.faq-item.open{border-color:var(--yellow)}
.faq-q{width:100%;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:18px 22px;background:none;border:none;text-align:left;font-size:15.5px;font-weight:700;cursor:pointer;font-family:inherit;color:var(--ink)}
.faq-q .ic{flex-shrink:0;width:26px;height:26px;border-radius:50%;background:var(--yellow);color:#1a1a1a;display:flex;align-items:center;justify-content:center;font-weight:900;transition:transform .25s}
.faq-item.open .faq-q .ic{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease;color:var(--gray);font-size:14.5px;padding:0 22px}
.faq-a p{padding-bottom:18px}

/* form */
.form-card{background:#111318;border-radius:22px;padding:44px;color:#fff;display:grid;grid-template-columns:.9fr 1.1fr;gap:44px;align-items:center}
.form-card .fc-left h2{font-size:30px;font-weight:900;line-height:1.25}
.form-card .fc-left p{color:#c3c9d2;margin-top:14px;font-size:15px}
.form-card .fc-left .contacts{margin-top:22px;display:flex;flex-direction:column;gap:10px;font-size:14px;color:#e5e9ef}
.form-card .fc-left .contacts span{color:var(--yellow);font-weight:700}
form{display:grid;gap:14px}
form .row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
form input,form select,form textarea{width:100%;padding:13px 15px;border-radius:10px;border:1px solid #2c3038;background:#1b1f26;color:#fff;font-size:14.5px;font-family:inherit;transition:.2s}
form input:focus,form select:focus,form textarea:focus{outline:none;border-color:var(--yellow);background:#22262e}
form input::placeholder,form textarea::placeholder{color:#7c828c}
form textarea{resize:vertical;min-height:100px}
form button{margin-top:4px;width:100%;padding:14px;font-size:15.5px}
.form-note{font-size:12px;color:#8b919b;text-align:center}

/* articles */
.articles{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.article{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:transform .28s,box-shadow .28s,border-color .28s}
.article:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:var(--yellow)}
.article .atag{font-size:12px;font-weight:700;color:#8a6d00;background:#fff7cc;padding:3px 10px;border-radius:999px}
.article h4{font-size:17px;font-weight:800;margin:14px 0 8px;line-height:1.4}
.article p{font-size:13.5px;color:var(--gray)}
.article .meta{margin-top:14px;font-size:12.5px;color:#9aa3af;display:flex;justify-content:space-between;align-items:center}
.article a.more{color:var(--ink);font-weight:700;font-size:13px}

/* footer */
footer{background:#0c0e12;color:#c3c9d2;padding:64px 0 28px}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px}
.foot-brand .brand{color:#fff;margin-bottom:16px}
.foot-brand p{font-size:13.5px;color:#8b919b;max-width:300px}
.foot-brand .qr{margin-top:18px;display:flex;align-items:center;gap:14px}
.foot-brand .qr img{width:88px;height:88px;object-fit:cover;border-radius:10px;border:2px solid #2c3038}
.foot-brand .qr span{font-size:12.5px;color:#8b919b}
footer h5{color:#fff;font-size:15px;font-weight:800;margin-bottom:16px}
footer ul{list-style:none}
footer ul li{margin-bottom:9px;font-size:13.5px}
footer ul li a{color:#9aa3af;transition:.2s}
footer ul li a:hover{color:var(--yellow)}
.foot-bottom{border-top:1px solid #1e222a;margin-top:44px;padding-top:24px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;font-size:13px;color:#6b7280}
.foot-bottom a{color:#9aa3af}
.foot-bottom a:hover{color:var(--yellow)}
.friend-links{display:flex;flex-wrap:wrap;gap:12px;margin-top:10px}
.friend-links a{font-size:13px;color:#9aa3af;padding:4px 12px;border:1px solid #2c3038;border-radius:999px}
.friend-links a:hover{color:var(--yellow);border-color:var(--yellow)}

/* floating */
.float-cta{position:fixed;right:22px;bottom:26px;z-index:120;display:flex;flex-direction:column;gap:12px}
.float-cta button,.float-cta a{width:52px;height:52px;border-radius:50%;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:20px;box-shadow:0 8px 24px rgba(0,0,0,.18);transition:transform .2s}
.float-cta a{background:var(--yellow);color:#1a1a1a;text-decoration:none;font-size:12px;font-weight:800}
.float-cta button{background:#111318;color:#fff}
.float-cta a:hover,.float-cta button:hover{transform:scale(1.08)}
.back-top{opacity:0;pointer-events:none;transition:.25s}
.back-top.show{opacity:1;pointer-events:auto}

/* reveal */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .6s ease,transform .6s ease}
.reveal.visible{opacity:1;transform:none}

/* responsive */
@media(max-width:1024px){
  .hero-inner{grid-template-columns:1fr;gap:40px}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3,.price-grid,.articles{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .network{grid-template-columns:repeat(2,1fr)}
  .rating-box{grid-template-columns:1fr;text-align:center}
  .form-card{grid-template-columns:1fr;padding:34px}
  .foot-grid{grid-template-columns:1fr 1fr}
  .nav-links{position:fixed;top:70px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;padding:12px 20px 20px;border-bottom:1px solid var(--line);box-shadow:var(--shadow);transform:translateY(-150%);transition:transform .3s ease;gap:0;max-height:calc(100vh - 70px);overflow-y:auto}
  .nav-links.open{transform:translateY(0)}
  .nav-links li a{padding:13px 10px;border-radius:8px}
  .burger{display:flex}
  .nav-cta .btn-ghost{display:none}
}
@media(max-width:640px){
  .section{padding:56px 0}
  .container{padding:0 18px}
  .grid-4,.grid-3,.price-grid,.articles,.steps,.network,form .row2{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr}
  .hero-inner{padding:52px 0 56px}
  .hero-metrics{gap:20px}
  .hero-metrics .m b{font-size:22px}
  .rating-box{padding:28px 20px}
  .rating-score .big{font-size:50px}
  .form-card{padding:24px}
  .nav-cta .btn-primary{padding:9px 16px;font-size:14px}
  .brand{font-size:16px}
  .brand .ai-page-logo{height:28px}
  .float-cta{right:14px;bottom:18px}
}