:root{
  --c1:#6366f1;--c2:#a855f7;--c3:#ec4899;--c4:#f59e0b;--c5:#10b981;--c6:#06b6d4;
  --ink:#1e1b2e;--ink2:#4b4960;--ink3:#6b6880;--bg:#f7f8ff;--card:#ffffff;
  --line:#e8e7f5;--radius:18px;--shadow:0 10px 30px rgba(99,102,241,.10);
  --grad:linear-gradient(120deg,#6366f1,#a855f7 45%,#ec4899);
  --grad2:linear-gradient(120deg,#06b6d4,#6366f1,#a855f7);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{text-decoration:none;color:inherit}
img{max-width:100%;height:auto;display:block}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}
section{padding:88px 0;position:relative}
.sec-head{text-align:center;max-width:760px;margin:0 auto 52px}
.sec-tag{display:inline-block;font-size:13px;font-weight:700;letter-spacing:1px;color:var(--c1);background:rgba(99,102,241,.1);padding:6px 16px;border-radius:999px;margin-bottom:16px}
.sec-title{font-size:clamp(24px,3.4vw,38px);font-weight:800;line-height:1.3;letter-spacing:-.5px}
.sec-sub{margin-top:14px;color:var(--ink3);font-size:15px}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
/* ============ NAV ============ */
header.nav{position:sticky;top:0;z-index:1000;background:rgba(255,255,255,.86);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;flex-shrink:0}
.brand .ai-page-logo{width:38px}
.nav-links{display:flex;align-items:center;gap:0;list-style:none;flex-wrap:wrap}
.nav-links li a{display:block;padding:8px 11px;font-size:14px;font-weight:600;color:var(--ink2);border-radius:8px;transition:.25s;white-space:nowrap}
.nav-links li a:hover{color:var(--c1);background:rgba(99,102,241,.08)}
.nav-cta{display:inline-block;padding:9px 20px;border-radius:999px;background:var(--grad);color:#fff;font-weight:700;font-size:14px;box-shadow:0 6px 18px rgba(168,85,247,.35);transition:.25s}
.nav-cta:hover{transform:translateY(-2px);box-shadow:0 10px 26px rgba(168,85,247,.45)}
.nav-toggle{display:none;width:42px;height:42px;border:none;background:rgba(99,102,241,.1);border-radius:10px;cursor:pointer;flex-direction:column;align-items:center;justify-content:center;gap:5px}
.nav-toggle span{width:20px;height:2px;background:var(--c1);border-radius:2px;transition:.3s}
.nav-toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.active span:nth-child(2){opacity:0}
.nav-toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
/* ============ HERO ============ */
.hero{position:relative;padding:80px 0 96px;overflow:hidden;background:
   radial-gradient(circle at 12% 18%,rgba(99,102,241,.18),transparent 42%),
   radial-gradient(circle at 88% 22%,rgba(236,72,153,.16),transparent 46%),
   radial-gradient(circle at 50% 100%,rgba(6,182,212,.15),transparent 55%),
   linear-gradient(160deg,#fbfbff,#f2f1ff)}
.hero::before,.hero::after{content:"";position:absolute;border-radius:50%;filter:blur(2px);opacity:.55;pointer-events:none}
.hero::before{width:220px;height:220px;left:-60px;top:120px;background:linear-gradient(135deg,#a855f7,#6366f1);opacity:.12}
.hero::after{width:300px;height:300px;right:-100px;bottom:-80px;background:linear-gradient(135deg,#ec4899,#f59e0b);opacity:.1}
.hero-inner{position:relative;z-index:2;display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center}
.hero-badge{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;color:var(--c2);background:#fff;padding:7px 16px;border-radius:999px;box-shadow:var(--shadow);margin-bottom:22px}
.hero-badge .dot{width:8px;height:8px;border-radius:50%;background:var(--c5);box-shadow:0 0 0 4px rgba(16,185,129,.18);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 4px rgba(16,185,129,.18)}50%{box-shadow:0 0 0 8px rgba(16,185,129,.05)}}
.hero h1{font-size:clamp(30px,4.4vw,52px);font-weight:900;line-height:1.16;letter-spacing:-1px}
.hero p.lead{margin-top:22px;font-size:clamp(15px,1.5vw,17px);color:var(--ink2);max-width:560px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:34px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 30px;border-radius:999px;font-weight:700;font-size:15px;transition:.28s;border:none;cursor:pointer}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 12px 30px rgba(168,85,247,.38)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 18px 40px rgba(168,85,247,.5)}
.btn-primary:active{transform:translateY(-1px) scale(.99)}
.btn-ghost{background:#fff;color:var(--c1);border:1.5px solid rgba(99,102,241,.35)}
.btn-ghost:hover{background:rgba(99,102,241,.06);transform:translateY(-3px)}
.hero-metrics{display:flex;flex-wrap:wrap;gap:26px;margin-top:40px}
.hero-metrics .m{display:flex;flex-direction:column}
.hero-metrics .m b{font-size:24px;font-weight:900;background:var(--grad2);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-metrics .m span{font-size:13px;color:var(--ink3);font-weight:600}
/* hero visual blocks (no images) */
.hero-visual{position:relative;display:flex;flex-direction:column;gap:16px}
.hv-card{background:#fff;border-radius:20px;padding:22px;box-shadow:0 18px 44px rgba(99,102,241,.14);border:1px solid rgba(255,255,255,.8);animation:floaty 6s ease-in-out infinite}
.hv-card:nth-child(2){animation-delay:1.2s;margin-left:34px}
.hv-card:nth-child(3){animation-delay:2.4s}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}
.hv-card .top{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.hv-icon{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:900;font-size:18px}
.hv-card .top b{font-size:15px}
.hv-card .top small{display:block;color:var(--ink3);font-size:12px;font-weight:600}
.hv-bar{height:8px;border-radius:99px;background:#eeeefc;overflow:hidden}
.hv-bar i{display:block;height:100%;border-radius:99px}
.hv-chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.hv-chips span{font-size:12px;font-weight:700;padding:5px 12px;border-radius:999px;background:#f2f1ff;color:var(--c1)}
/* ============ MARQUEE / TAGS ============ */
.tagcloud{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.tagcloud span{font-size:13px;font-weight:700;padding:8px 16px;border-radius:999px;background:#fff;color:var(--ink2);border:1px solid var(--line);transition:.25s;cursor:default}
.tagcloud span:hover{color:#fff;background:var(--grad);border-color:transparent;transform:translateY(-3px);box-shadow:var(--shadow)}
/* ============ CARDS GRID ============ */
.grid{display:grid;gap:24px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--card);border-radius:var(--radius);padding:28px;border:1px solid var(--line);box-shadow:0 4px 14px rgba(30,27,46,.04);transition:.3s;position:relative;overflow:hidden}
.card:hover{transform:translateY(-6px);box-shadow:0 20px 44px rgba(99,102,241,.16);border-color:rgba(99,102,241,.28)}
.card .ic{width:52px;height:52px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:900;color:#fff;margin-bottom:18px;box-shadow:0 8px 20px rgba(99,102,241,.22)}
.card h3{font-size:18px;font-weight:800;margin-bottom:10px}
.card p{font-size:14px;color:var(--ink3)}
.card ul{margin:12px 0 0;padding-left:18px;font-size:13.5px;color:var(--ink3)}
.card ul li{margin-bottom:6px}
/* stat cards */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:-64px;position:relative;z-index:5}
.stat{background:#fff;border-radius:18px;padding:26px 20px;text-align:center;box-shadow:0 14px 36px rgba(99,102,241,.12);border:1px solid var(--line);transition:.3s}
.stat:hover{transform:translateY(-6px)}
.stat b{display:block;font-size:32px;font-weight:900;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat span{font-size:13px;color:var(--ink3);font-weight:600}
/* ============ STEPS ============ */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:st}
.step{background:#fff;border-radius:var(--radius);padding:30px 24px;border:1px solid var(--line);position:relative;transition:.3s}
.step:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.step::before{counter-increment:st;content:"0" counter(st);font-size:40px;font-weight:900;color:rgba(99,102,241,.14);position:absolute;top:14px;right:20px;line-height:1}
.step h3{font-size:17px;font-weight:800;margin-bottom:10px}
.step p{font-size:13.5px;color:var(--ink3)}
/* ============ TABLE ============ */
.table-wrap{overflow-x:auto;border-radius:16px;box-shadow:0 10px 30px rgba(99,102,241,.10);background:#fff}
table{width:100%;border-collapse:collapse;min-width:720px}
th,td{padding:16px 20px;text-align:left;font-size:14px;border-bottom:1px solid var(--line)}
thead th{background:linear-gradient(120deg,#f4f2ff,#fdf2ff);font-weight:800;color:var(--ink);font-size:14px;white-space:nowrap}
tbody tr:hover{background:#faf9ff}
td.hl{font-weight:700;color:var(--c1)}
.badge-star{display:inline-block;color:#f59e0b;font-weight:800}
/* ============ REVIEW CARDS ============ */
.review{background:#fff;border-radius:var(--radius);padding:28px;border:1px solid var(--line);transition:.3s;display:flex;flex-direction:column}
.review:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:rgba(236,72,153,.3)}
.review .stars{color:#f59e0b;font-size:15px;margin-bottom:14px;letter-spacing:2px}
.review p{font-size:14px;color:var(--ink2);flex:1}
.review .who{display:flex;align-items:center;gap:12px;margin-top:20px;padding-top:18px;border-top:1px dashed var(--line)}
.avatar{width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:15px;flex-shrink:0}
.review .who b{display:block;font-size:14px}
.review .who small{color:var(--ink3);font-size:12px}
/* ============ CASES ============ */
.case{background:#fff;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);transition:.3s}
.case:hover{transform:translateY(-6px);box-shadow:0 20px 44px rgba(99,102,241,.16)}
.case .imgbox{overflow:hidden;aspect-ratio:16/10;background:#f2f1ff}
.case .imgbox img{width:100%;height:100%;object-fit:cover;transition:.5s}
.case:hover .imgbox img{transform:scale(1.06)}
.case .body{padding:22px}
.case .body span{font-size:12px;font-weight:700;color:var(--c2)}
.case .body h3{font-size:17px;font-weight:800;margin:8px 0}
.case .body p{font-size:13.5px;color:var(--ink3)}
/* ============ FAQ ============ */
.faq-list{max-width:860px;margin:0 auto}
.faq-item{background:#fff;border-radius:14px;border:1px solid var(--line);margin-bottom:14px;overflow:hidden;transition:.3s}
.faq-item:hover{border-color:rgba(99,102,241,.3)}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 24px;background:none;border:none;cursor:pointer;font-size:15.5px;font-weight:700;text-align:left;color:var(--ink);font-family:inherit}
.faq-q .sign{width:26px;height:26px;flex-shrink:0;border-radius:50%;background:rgba(99,102,241,.1);color:var(--c1);display:flex;align-items:center;justify-content:center;font-size:18px;transition:.3s;font-weight:700}
.faq-item.open .sign{transform:rotate(45deg);background:var(--grad);color:#fff}
.faq-a{max-height:0;overflow:hidden;transition:max-height .4s ease;padding:0 24px;color:var(--ink3);font-size:14px}
.faq-item.open .faq-a{padding-bottom:22px}
/* ============ FORM ============ */
.form-box{background:#fff;border-radius:24px;padding:44px;box-shadow:0 24px 60px rgba(99,102,241,.14);border:1px solid var(--line)}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.form-grid .full{grid-column:1/-1}
.field label{display:block;font-size:13.5px;font-weight:700;margin-bottom:8px;color:var(--ink2)}
.field input,.field select,.field textarea{width:100%;padding:13px 16px;border-radius:12px;border:1.5px solid var(--line);font-size:14px;font-family:inherit;background:#fcfcff;transition:.25s;color:var(--ink)}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--c1);box-shadow:0 0 0 4px rgba(99,102,241,.12);background:#fff}
.field textarea{resize:vertical;min-height:120px}
.form-note{font-size:12.5px;color:var(--ink3);margin-top:14px}
/* ============ CONTACT ============ */
.contact-card{background:#fff;border-radius:var(--radius);padding:26px;border:1px solid var(--line);display:flex;gap:16px;align-items:flex-start;transition:.3s}
.contact-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.contact-card .ic{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:20px;color:#fff;flex-shrink:0}
.contact-card b{display:block;font-size:15px;margin-bottom:4px}
.contact-card span{font-size:13.5px;color:var(--ink3);word-break:break-all}
.qr-img{width:140px;border-radius:12px;border:1px solid var(--line);margin-top:10px}
/* ============ TIMELINE ============ */
.timeline{position:relative;max-width:820px;margin:0 auto;padding-left:34px}
.timeline::before{content:"";position:absolute;left:9px;top:6px;bottom:6px;width:3px;border-radius:99px;background:var(--grad2)}
.tl-item{position:relative;margin-bottom:34px}
.tl-item::before{content:"";position:absolute;left:-32px;top:4px;width:16px;height:16px;border-radius:50%;background:#fff;border:4px solid var(--c1);box-shadow:0 0 0 4px rgba(99,102,241,.12)}
.tl-item b{display:block;font-size:16px;font-weight:800;margin-bottom:6px}
.tl-item p{font-size:13.5px;color:var(--ink3)}
/* ============ NETWORK ============ */
.net-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:14px}
.net-item{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 10px;text-align:center;font-weight:700;font-size:14px;transition:.3s;color:var(--ink2)}
.net-item:hover{background:var(--grad2);color:#fff;transform:translateY(-4px);border-color:transparent}
/* ============ ARTICLE ============ */
.article-list{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.article-card{background:#fff;border-radius:16px;padding:22px;border:1px solid var(--line);transition:.3s;display:flex;flex-direction:column;justify-content:space-between;min-height:150px}
.article-card:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:rgba(99,102,241,.3)}
.article-card b{font-size:15px;font-weight:800;line-height:1.45}
.article-card .more{font-size:13px;color:var(--c1);font-weight:700;margin-top:14px}
/* ============ PRICE ============ */
.price-tier{background:#fff;border-radius:var(--radius);padding:32px 26px;border:1px solid var(--line);text-align:center;transition:.3s}
.price-tier:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.price-tier.featured{border:2px solid transparent;background:linear-gradient(#fff,#fff) padding-box,var(--grad) border-box;box-shadow:0 20px 50px rgba(168,85,247,.18)}
.price-tier h3{font-size:17px;font-weight:800;margin-bottom:8px}
.price-tier .amount{font-size:34px;font-weight:900;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.price-tier .amount small{font-size:14px;color:var(--ink3);font-weight:600;-webkit-text-fill-color:var(--ink3)}
.price-tier ul{list-style:none;margin:20px 0;text-align:left}
.price-tier ul li{font-size:13.5px;color:var(--ink2);padding:7px 0;border-bottom:1px dashed var(--line)}
.price-tier ul li::before{content:"✓";color:var(--c5);font-weight:900;margin-right:8px}
/* ============ CTA BANNER ============ */
.cta-band{background:var(--grad);border-radius:26px;padding:56px 44px;text-align:center;color:#fff;position:relative;overflow:hidden}
.cta-band::before{content:"";position:absolute;width:340px;height:340px;border-radius:50%;background:rgba(255,255,255,.14);top:-140px;right:-100px}
.cta-band::after{content:"";position:absolute;width:220px;height:220px;border-radius:50%;background:rgba(255,255,255,.1);bottom:-110px;left:-60px}
.cta-band h2{font-size:clamp(22px,3vw,34px);font-weight:900;position:relative;z-index:2}
.cta-band p{margin-top:14px;font-size:15px;opacity:.92;position:relative;z-index:2}
.cta-band .btn{margin-top:28px;background:#fff;color:var(--c1);position:relative;z-index:2}
.cta-band .btn:hover{transform:translateY(-3px);box-shadow:0 16px 40px rgba(0,0,0,.15)}
/* ============ FOOTER ============ */
footer{background:#16142a;color:#c8c5dd;padding:64px 0 28px;margin-top:20px}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.3fr;gap:40px}
.foot-brand .ai-page-logo{width:40px;margin-bottom:16px}
.foot-brand p{font-size:13.5px;line-height:1.9;color:#a3a0ba}
footer h4{color:#fff;font-size:15px;font-weight:800;margin-bottom:18px}
footer ul{list-style:none}
footer ul li{margin-bottom:10px;font-size:13.5px}
footer ul li a{color:#a3a0ba;transition:.25s}
footer ul li a:hover{color:#fff;padding-left:4px}
.foot-bottom{border-top:1px solid rgba(255,255,255,.08);margin-top:44px;padding-top:24px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;font-size:13px;color:#8b88a3}
/* ============ FLOAT ============ */
.float-btns{position:fixed;right:22px;bottom:28px;z-index:1200;display:flex;flex-direction:column;gap:12px}
.float-btn{width:54px;height:54px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:12px;font-weight:800;cursor:pointer;box-shadow:0 10px 26px rgba(99,102,241,.4);transition:.3s;border:none;text-align:center;line-height:1.2;flex-direction:column;gap:2px}
.float-btn.serve{background:var(--grad)}
.float-btn.top{background:#1e1b2e;opacity:0;visibility:hidden;transition:.35s}
.float-btn.top.show{opacity:1;visibility:visible}
.float-btn:hover{transform:translateY(-4px) scale(1.05)}
.kefu-pop{position:fixed;right:22px;bottom:96px;z-index:1201;background:#fff;border-radius:18px;padding:16px;box-shadow:0 20px 50px rgba(30,27,46,.25);text-align:center;opacity:0;visibility:hidden;transform:translateY(14px);transition:.3s;width:200px}
.kefu-pop.show{opacity:1;visibility:visible;transform:translateY(0)}
.kefu-pop b{font-size:13.5px;display:block;margin-bottom:10px}
.kefu-pop img{width:100%;border-radius:10px}
/* ============ REVEAL ============ */
.reveal{opacity:0;transform:translateY(32px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
/* ============ RESPONSIVE ============ */
@media(max-width:1024px){
  .hero-inner{grid-template-columns:1fr;gap:44px}
  .hero-visual{max-width:520px}
  .g4{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .net-grid{grid-template-columns:repeat(3,1fr)}
  .article-list{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr}
  .nav-links{display:none;position:absolute;top:68px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;padding:14px 20px;border-bottom:1px solid var(--line);box-shadow:0 20px 40px rgba(30,27,46,.1);gap:0}
  .nav-links.open{display:flex}
  .nav-links li a{padding:12px 10px;border-radius:10px}
  .nav-toggle{display:flex}
  .nav-cta{display:none}
}
@media(max-width:768px){
  section{padding:64px 0}
  .container{padding:0 18px}
  .g3,.g2{grid-template-columns:1fr}
  .g4{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .form-grid{grid-template-columns:1fr}
  .form-box{padding:28px 22px}
  .net-grid{grid-template-columns:repeat(2,1fr)}
  .article-list{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr;gap:32px}
  .cta-band{padding:40px 24px}
  .hero{padding:54px 0 88px}
  .stats{grid-template-columns:1fr 1fr;gap:14px;margin-top:-56px}
  .stat b{font-size:26px}
  .hv-card:nth-child(2){margin-left:0}
  .float-btns{right:14px;bottom:18px}
  .float-btn{width:48px;height:48px}
  .hero-metrics{gap:20px}
}
@media(max-width:480px){
  .hero-actions .btn{width:100%}
  .stats{grid-template-columns:1fr}
}