*{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#f6f9ff;
  --ink:#0f1a33;
  --ink-soft:#43506b;
  --line:#e2e9f5;
  --brand:#1f5fff;
  --brand-deep:#0b3bd6;
  --cyan:#00c2ff;
  --mint:#12d3a5;
  --card:#ffffff;
  --shadow:0 12px 32px rgba(24,52,120,.09);
  --radius:18px;
}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,sans-serif;
  background:
    radial-gradient(1100px 520px at 8% -8%, #dbe7ff 0%, rgba(219,231,255,0) 62%),
    radial-gradient(900px 480px at 96% 4%, #d3f4ff 0%, rgba(211,244,255,0) 60%),
    radial-gradient(800px 500px at 50% 42%, #eef4ff 0%, rgba(238,244,255,0) 70%),
    var(--bg);
  color:var(--ink);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
.container{width:100%;max-width:1180px;margin:0 auto;padding:0 20px}
img{max-width:100%;height:auto;display:block}
a{text-decoration:none;color:inherit}
ul{list-style:none}
h1,h2,h3{line-height:1.3;letter-spacing:-.3px}
section{padding:64px 0}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:600;color:var(--brand-deep);
  background:rgba(31,95,255,.09);
  border:1px solid rgba(31,95,255,.16);
  padding:6px 14px;border-radius:999px;margin-bottom:16px;
}
.eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--brand);box-shadow:0 0 0 4px rgba(31,95,255,.15)}
.sec-head{max-width:720px;margin-bottom:36px}
.sec-head h2{font-size:clamp(23px,3.2vw,32px);font-weight:800;margin-bottom:12px}
.sec-head p{color:var(--ink-soft);font-size:15px}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center}

/* nav */
.site-header{position:sticky;top:0;z-index:90;background:rgba(246,249,255,.86);backdrop-filter:blur(14px);border-bottom:1px solid rgba(226,233,245,.9)}
.nav-bar{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:70px}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.ai-page-logo{width:126px}
.brand-name{font-size:17px;font-weight:800;white-space:nowrap}
.nav-links{display:flex;align-items:center;gap:0;flex-wrap:wrap}
.nav-links a{
  font-size:14px;color:var(--ink-soft);padding:8px 11px;border-radius:8px;
  transition:color .2s,background .2s;white-space:nowrap;
}
.nav-links a:hover{color:var(--brand);background:rgba(31,95,255,.07)}
.nav-tail{display:flex;align-items:center;gap:10px;flex-shrink:0}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-size:14px;font-weight:700;border-radius:12px;padding:11px 22px;
  border:1px solid transparent;cursor:pointer;transition:transform .2s,box-shadow .25s,background .2s;
}
.btn:active{transform:scale(.97)}
.btn-primary{background:linear-gradient(120deg,var(--brand) 0%,#3d84ff 55%,var(--cyan) 100%);color:#fff;box-shadow:0 10px 24px rgba(31,95,255,.28)}
.btn-primary:hover{box-shadow:0 16px 32px rgba(31,95,255,.36);transform:translateY(-2px)}
.btn-ghost{background:#fff;color:var(--brand-deep);border-color:rgba(31,95,255,.28)}
.btn-ghost:hover{background:rgba(31,95,255,.06);transform:translateY(-2px)}
.btn-sm{padding:9px 16px;font-size:13px;border-radius:10px}
.menu-toggle{display:none;width:42px;height:38px;border:1px solid var(--line);background:#fff;border-radius:10px;cursor:pointer;flex-direction:column;gap:5px;align-items:center;justify-content:center}
.menu-toggle span{width:18px;height:2px;background:var(--ink);border-radius:2px;transition:.25s}
.menu-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.menu-toggle.open span:nth-child(2){opacity:0}
.menu-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.mobile-panel{display:none}

/* hero */
.hero{padding:64px 0 70px;position:relative;overflow:hidden}
.hero::after{
  content:"";position:absolute;inset:auto -10% -60% 55%;height:420px;
  background:radial-gradient(closest-side,rgba(0,194,255,.22),transparent 72%);
  pointer-events:none;
}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:44px;align-items:start;position:relative;z-index:1}
.hero h1{font-size:clamp(28px,4.4vw,46px);font-weight:900;letter-spacing:-1px;margin-bottom:18px}
.hero h1 em{
  font-style:normal;
  background:linear-gradient(100deg,var(--brand) 10%,var(--cyan) 90%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-lead{font-size:16px;color:var(--ink-soft);max-width:560px;margin-bottom:24px}
.hero-tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:28px}
.tag{
  font-size:12.5px;font-weight:600;color:var(--brand-deep);
  background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 12px;
  box-shadow:0 4px 12px rgba(24,52,120,.05);
}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:26px}
.hero-note{font-size:13px;color:var(--ink-soft);display:flex;align-items:center;gap:8px}
.hero-note::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--mint);box-shadow:0 0 0 4px rgba(18,211,165,.16)}
.hero-panel{
  background:linear-gradient(165deg,#ffffff 0%,#f2f7ff 100%);
  border:1px solid var(--line);border-radius:22px;padding:22px;
  box-shadow:var(--shadow);position:relative;overflow:hidden;
}
.hero-panel::before{
  content:"";position:absolute;top:-40px;right:-40px;width:150px;height:150px;border-radius:50%;
  background:radial-gradient(circle,rgba(31,95,255,.16),transparent 70%);
}
.panel-title{font-size:14px;font-weight:800;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.panel-title i{width:22px;height:22px;border-radius:7px;background:linear-gradient(135deg,var(--brand),var(--cyan));display:inline-block}
.panel-list{display:grid;gap:10px}
.panel-item{
  display:flex;align-items:flex-start;gap:10px;background:#fff;border:1px solid var(--line);
  border-radius:12px;padding:11px 13px;transition:transform .25s,box-shadow .25s;
}
.panel-item:hover{transform:translateY(-3px);box-shadow:0 10px 20px rgba(24,52,120,.08)}
.panel-item b{font-size:13.5px;font-weight:700;display:block}
.panel-item small{font-size:12px;color:var(--ink-soft);line-height:1.55;display:block}
.dot{width:8px;height:8px;border-radius:50%;background:var(--brand);margin-top:7px;flex-shrink:0}
.dot.m{background:var(--mint)}
.dot.c{background:var(--cyan)}
.panel-foot{margin-top:14px;font-size:12px;color:var(--ink-soft);text-align:center}

/* metrics */
.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:44px}
.metric{
  background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px 18px;
  box-shadow:0 8px 22px rgba(24,52,120,.06);transition:transform .3s,box-shadow .3s;
}
.metric:hover{transform:translateY(-4px);box-shadow:0 16px 30px rgba(24,52,120,.1)}
.metric strong{display:block;font-size:26px;font-weight:900;color:var(--brand-deep);letter-spacing:-.5px}
.metric span{font-size:13px;color:var(--ink-soft)}

/* cards */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;align-items:stretch}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;align-items:stretch}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:24px;box-shadow:0 8px 24px rgba(24,52,120,.05);
  transition:transform .3s,box-shadow .3s,border-color .3s;
}
.card:hover{transform:translateY(-5px);box-shadow:0 18px 36px rgba(24,52,120,.11);border-color:rgba(31,95,255,.28)}
.card h3{font-size:17px;font-weight:800;margin-bottom:8px}
.card p{font-size:14px;color:var(--ink-soft)}
.card-ico{
  width:44px;height:44px;border-radius:13px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(140deg,rgba(31,95,255,.13),rgba(0,194,255,.16));
  color:var(--brand-deep);font-weight:900;font-size:15px;margin-bottom:14px;
}
.card ul{margin-top:12px;display:grid;gap:7px}
.card ul li{font-size:13.5px;color:var(--ink-soft);padding-left:16px;position:relative}
.card ul li::before{content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border-radius:2px;background:var(--mint)}

/* scenarios */
.scn-wrap{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.scn{
  background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 16px 15px;
  transition:transform .25s,box-shadow .25s,background .25s;
}
.scn:hover{transform:translateY(-4px);background:linear-gradient(160deg,#fff,#f3f8ff);box-shadow:0 12px 26px rgba(24,52,120,.1)}
.scn b{display:block;font-size:14px;font-weight:800;margin-bottom:5px}
.scn small{font-size:12.5px;color:var(--ink-soft);line-height:1.6;display:block}

/* models */
.models{display:flex;flex-wrap:wrap;gap:9px;margin-top:8px}
.model{
  font-size:13px;font-weight:600;color:#20314f;background:#fff;border:1px solid var(--line);
  border-radius:9px;padding:7px 13px;transition:.2s;
}
.model:hover{border-color:var(--brand);color:var(--brand-deep);transform:translateY(-2px)}

/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;counter-reset:step}
.step{
  background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px 20px;position:relative;
  transition:transform .3s,box-shadow .3s;
}
.step:hover{transform:translateY(-4px);box-shadow:0 16px 30px rgba(24,52,120,.1)}
.step::before{
  counter-increment:step;content:"0" counter(step);
  font-size:13px;font-weight:900;color:#fff;background:linear-gradient(135deg,var(--brand),var(--cyan));
  border-radius:8px;padding:3px 9px;display:inline-block;margin-bottom:12px;letter-spacing:.5px;
}
.step h3{font-size:15.5px;margin-bottom:6px}
.step p{font-size:13px;color:var(--ink-soft)}

/* table */
.table-scroll{overflow-x:auto;border-radius:16px;border:1px solid var(--line);background:#fff;box-shadow:0 10px 28px rgba(24,52,120,.07)}
table{width:100%;border-collapse:collapse;min-width:680px}
th,td{padding:15px 18px;text-align:left;font-size:14px;border-bottom:1px solid var(--line)}
thead th{background:linear-gradient(120deg,#eef4ff,#e6fbff);font-weight:800;color:var(--brand-deep);font-size:13.5px;white-space:nowrap}
tbody tr:last-child td{border-bottom:none}
tbody tr:hover{background:#f8fbff}
td.best{font-weight:700;color:var(--brand-deep)}

/* rating */
.rating-box{
  display:grid;grid-template-columns:220px 1fr;gap:24px;align-items:center;
  background:linear-gradient(135deg,#ffffff,#f0f7ff);border:1px solid var(--line);
  border-radius:20px;padding:26px;box-shadow:var(--shadow);margin-bottom:26px;
}
.rating-score{text-align:center}
.rating-score strong{display:block;font-size:52px;font-weight:900;line-height:1;color:var(--brand-deep);letter-spacing:-2px}
.rating-score b{font-size:14px;color:var(--ink-soft);font-weight:600}
.stars{display:flex;gap:4px;justify-content:center;margin-top:10px}
.stars i{width:18px;height:18px;background:linear-gradient(135deg,#ffb020,#ff8a00);clip-path:polygon(50% 0,61% 35%,98% 35%,68% 57%,79% 91%,50% 70%,21% 91%,32% 57%,2% 35%,39% 35%)}
.rating-desc h3{font-size:19px;margin-bottom:8px}
.rating-desc p{font-size:14px;color:var(--ink-soft)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.chip{font-size:12.5px;font-weight:600;color:var(--brand-deep);background:#fff;border:1px solid rgba(31,95,255,.22);border-radius:999px;padding:5px 12px}

/* reviews */
.review{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;display:flex;flex-direction:column;gap:12px;transition:transform .3s,box-shadow .3s}
.review:hover{transform:translateY(-4px);box-shadow:0 16px 32px rgba(24,52,120,.1)}
.review p{font-size:14px;color:#2a3category;color:#2a3552}
.review-foot{display:flex;align-items:center;gap:10px;margin-top:auto}
.avatar{
  width:38px;height:38px;border-radius:50%;flex-shrink:0;
  background:linear-gradient(140deg,var(--brand),var(--cyan));color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:800;
}
.review-foot b{font-size:13.5px;display:block}
.review-foot small{font-size:12px;color:var(--ink-soft)}

/* media */
.media-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.media-card{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;transition:transform .3s,box-shadow .3s}
.media-card:hover{transform:translateY(-4px);box-shadow:0 16px 32px rgba(24,52,120,.11)}
.media-thumb{background:#eef4ff}
.media-thumb img{width:100%;height:auto;object-fit:contain}
.media-body{padding:16px 18px}
.media-body b{font-size:15px;display:block;margin-bottom:5px}
.media-body small{font-size:13px;color:var(--ink-soft);line-height:1.6;display:block}
.banner-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:22px}
.banner-strip img{border-radius:14px;border:1px solid var(--line);background:#fff}

/* timeline */
.timeline{position:relative;padding-left:26px;display:grid;gap:20px}
.timeline::before{content:"";position:absolute;left:7px;top:6px;bottom:6px;width:2px;background:linear-gradient(180deg,var(--brand),var(--cyan))}
.tl-item{position:relative}
.tl-item::before{content:"";position:absolute;left:-26px;top:7px;width:12px;height:12px;border-radius:50%;background:#fff;border:3px solid var(--brand)}
.tl-item b{font-size:15px;display:block;margin-bottom:4px}
.tl-item small{font-size:13.5px;color:var(--ink-soft)}

/* network */
.net-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.net{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;transition:transform .25s,box-shadow .25s}
.net:hover{transform:translateY(-3px);box-shadow:0 12px 24px rgba(24,52,120,.09)}
.net b{font-size:14.5px;display:block;margin-bottom:5px}
.net small{font-size:13px;color:var(--ink-soft)}

/* faq */
.faq-list{display:grid;gap:12px;max-width:900px;margin:0 auto}
.faq{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:box-shadow .25s,border-color .25s}
.faq.open{border-color:rgba(31,95,255,.35);box-shadow:0 12px 26px rgba(24,52,120,.09)}
.faq-q{
  width:100%;text-align:left;background:none;border:none;cursor:pointer;
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:16px 18px;font-size:14.5px;font-weight:700;color:var(--ink);font-family:inherit;
}
.faq-q span.plus{width:22px;height:22px;border-radius:50%;background:rgba(31,95,255,.1);color:var(--brand);display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:900;flex-shrink:0;transition:transform .25s,background .25s}
.faq.open .plus{transform:rotate(45deg);background:var(--brand);color:#fff}
.faq-a{max-height:0;overflow:hidden;transition:max-height .32s ease}
.faq-a p{padding:0 18px 16px;font-size:13.5px;color:var(--ink-soft)}

/* form */
.form-wrap{
  display:grid;grid-template-columns:.9fr 1.1fr;gap:28px;align-items:start;
  background:linear-gradient(150deg,#ffffff,#f0f7ff);border:1px solid var(--line);
  border-radius:22px;padding:30px;box-shadow:var(--shadow);
}
.form-info h2{font-size:24px;margin-bottom:12px}
.form-info p{font-size:14px;color:var(--ink-soft);margin-bottom:18px}
.contact-list{display:grid;gap:10px}
.contact-list li{font-size:13.5px;color:var(--ink-soft);display:flex;gap:9px;align-items:flex-start}
.contact-list li b{color:var(--ink);font-weight:700;flex-shrink:0}
.qr-box{margin-top:18px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px;width:132px;text-align:center}
.qr-box img{border-radius:8px;width:100%}
.qr-box small{display:block;font-size:11.5px;color:var(--ink-soft);margin-top:6px}
form{display:grid;gap:13px}
.field label{display:block;font-size:13px;font-weight:700;margin-bottom:6px}
.field input,.field select,.field textarea{
  width:100%;font-family:inherit;font-size:14px;color:var(--ink);
  background:#fff;border:1px solid var(--line);border-radius:11px;padding:11px 13px;
  transition:border-color .2s,box-shadow .2s;
}
.field textarea{resize:vertical;min-height:96px}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(31,95,255,.13);
}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:13px}
.form-submit{border:none;font-family:inherit}

/* articles */
.article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.article{
  background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;
  transition:transform .28s,box-shadow .28s,border-color .28s;display:block;
}
.article:hover{transform:translateY(-4px);box-shadow:0 16px 30px rgba(24,52,120,.11);border-color:rgba(31,95,255,.3)}
.article b{font-size:14.5px;display:block;margin-bottom:6px}
.article small{font-size:12.5px;color:var(--ink-soft)}

/* footer */
.site-footer{background:#0d1730;color:#cfd8ea;padding:52px 0 0;margin-top:24px}
.footer-top{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:28px;padding-bottom:34px}
.site-footer h3{font-size:15px;color:#fff;margin-bottom:14px;font-weight:800}
.site-footer p{font-size:13.5px;color:#a9b6cf;line-height:1.75}
.footer-brand{display:flex;flex-direction:column;gap:12px}
.footer-brand .ai-page-logo{width:132px}
.footer-links{display:grid;gap:8px}
.footer-links a{font-size:13.5px;color:#a9b6cf;transition:color .2s,transform .2s;display:inline-block}
.footer-links a:hover{color:#5ea6ff;transform:translateX(2px)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:18px 0 22px;display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;align-items:center;font-size:12.5px;color:#8b9ab8}

/* float */
.float-cs{position:fixed;right:18px;bottom:22px;z-index:120;display:flex;flex-direction:column;gap:10px;align-items:flex-end}
.fc-btn{
  width:52px;height:52px;border-radius:16px;border:none;cursor:pointer;
  background:linear-gradient(140deg,var(--brand),var(--cyan));color:#fff;
  font-size:12px;font-weight:800;display:flex;align-items:center;justify-content:center;
  box-shadow:0 12px 26px rgba(31,95,255,.35);transition:transform .25s,box-shadow .25s;font-family:inherit;
}
.fc-btn:hover{transform:translateY(-3px);box-shadow:0 18px 32px rgba(31,95,255,.42)}
.fc-panel{
  display:none;background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px;
  box-shadow:0 20px 44px rgba(13,23,48,.18);width:212px;text-align:center;
}
.fc-panel.show{display:block;animation:pop .26s ease both}
.fc-panel img{width:100%;border-radius:10px;margin-bottom:8px}
.fc-panel small{font-size:12px;color:var(--ink-soft);display:block;line-height:1.6}
@keyframes pop{from{opacity:0;transform:translateY(10px) scale(.96)}to{opacity:1;transform:none}}

/* reveal */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

@media (max-width:1024px){
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .metrics{grid-template-columns:repeat(2,1fr)}
  .grid-3,.scn-wrap,.net-grid,.article-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .footer-top{grid-template-columns:1fr 1fr}
  .banner-strip{grid-template-columns:repeat(2,1fr)}
  .form-wrap{grid-template-columns:1fr}
  .rating-box{grid-template-columns:1fr;text-align:center}
  .rating-desc{text-align:left}
}
@media (max-width:860px){
  .nav-links,.nav-tail{display:none}
  .menu-toggle{display:flex}
  .mobile-panel{display:none;border-top:1px solid var(--line);background:rgba(246,249,255,.98);padding:12px 20px 20px}
  .mobile-panel.show{display:block}
  .mobile-panel nav{display:grid;gap:2px;margin-bottom:12px}
  .mobile-panel nav a{font-size:14px;color:var(--ink-soft);padding:10px 6px;border-bottom:1px dashed var(--line)}
  .mobile-panel .mp-actions{display:grid;gap:9px}
}
@media (max-width:720px){
  section{padding:48px 0}
  .hero{padding:44px 0 54px}
  .grid-3,.grid-2,.scn-wrap,.net-grid,.article-grid,.steps,.media-grid,.banner-strip{grid-template-columns:1fr}
  .metrics{grid-template-columns:1fr 1fr;gap:12px}
  .metric strong{font-size:22px}
  .field-row{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr;gap:22px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .rating-score strong{font-size:44px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
}