*{margin:0;padding:0;box-sizing:border-box}
:root{
  --ink:#0f2f38;
  --ink-2:#1c4b57;
  --ink-3:#4a6b73;
  --teal:#0fb5a5;
  --teal-d:#0a8f84;
  --teal-l:#e6faf7;
  --cyan:#26c6da;
  --bg:#f4fafa;
  --card:#ffffff;
  --line:#d8ecea;
  --shadow:0 10px 30px rgba(15,90,95,.08);
  --shadow-h:0 18px 44px rgba(15,120,120,.16);
  --radius:18px;
}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,sans-serif;
  color:var(--ink);
  background:
    radial-gradient(1100px 520px at 12% -8%, #d8f5f1 0%, rgba(216,245,241,0) 60%),
    radial-gradient(900px 500px at 92% 4%, #e2f7fb 0%, rgba(226,247,251,0) 55%),
    linear-gradient(180deg,#f4fafa 0%,#eef8f7 40%,#f2fbfa 100%);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul{list-style:none}
.container{width:100%;max-width:1180px;margin:0 auto;padding:0 20px}
section{padding:64px 0}
h1,h2,h3,h4{line-height:1.3;color:var(--ink);font-weight:800}
h2{font-size:clamp(22px,3vw,32px);letter-spacing:.5px}
h3{font-size:19px}
p{color:var(--ink-3)}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:700;color:var(--teal-d);
  background:var(--teal-l);border:1px solid #c7eeea;
  padding:6px 14px;border-radius:999px;letter-spacing:1px;
}
.eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--teal)}
.sec-head{max-width:760px;margin-bottom:34px}
.sec-head p{margin-top:12px;font-size:15.5px}

/* Buttons */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:12px;font-weight:700;font-size:15px;
  border:1px solid transparent;cursor:pointer;transition:.25s;white-space:nowrap;
}
.btn-primary{
  background:linear-gradient(135deg,var(--teal) 0%,var(--cyan) 100%);
  color:#fff;box-shadow:0 8px 22px rgba(15,181,165,.32);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 30px rgba(15,181,165,.42)}
.btn-ghost{background:rgba(255,255,255,.85);color:var(--teal-d);border-color:#b9e6e0;backdrop-filter:blur(4px)}
.btn-ghost:hover{background:#fff;border-color:var(--teal);transform:translateY(-2px)}
.btn-sm{padding:9px 18px;font-size:14px;border-radius:10px}

/* Header */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(247,253,252,.88);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:70px}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.ai-page-logo{height:38px;width:auto}
.brand-txt{font-weight:800;font-size:17px;color:var(--ink);letter-spacing:.5px}
.brand-txt small{display:block;font-size:11px;font-weight:600;color:var(--teal-d);letter-spacing:2px}
.nav-links{display:flex;align-items:center;gap:0;flex-wrap:wrap}
.nav-links li a{
  display:block;padding:10px 13px;font-size:14.5px;font-weight:600;color:var(--ink-2);
  border-radius:9px;transition:.2s;position:relative;
}
.nav-links li a:hover{color:var(--teal-d);background:rgba(15,181,165,.09)}
.nav-actions{display:flex;align-items:center;gap:10px;flex-shrink:0}
.menu-toggle{
  display:none;width:44px;height:44px;border-radius:11px;border:1px solid var(--line);
  background:#fff;cursor:pointer;align-items:center;justify-content:center;flex-direction:column;gap:5px;
}
.menu-toggle span{display:block;width:20px;height:2px;background:var(--ink-2);border-radius:2px;transition:.25s}
.menu-toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.menu-toggle.active span:nth-child(2){opacity:0}
.menu-toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* Hero */
.hero{position:relative;overflow:hidden;padding:70px 0 76px}
.hero::before,.hero::after{
  content:"";position:absolute;border-radius:50%;pointer-events:none;filter:blur(2px);
}
.hero::before{width:520px;height:520px;right:-140px;top:-180px;background:radial-gradient(circle,rgba(38,198,218,.24),rgba(38,198,218,0) 68%);animation:floatA 14s ease-in-out infinite}
.hero::after{width:420px;height:420px;left:-160px;bottom:-200px;background:radial-gradient(circle,rgba(15,181,165,.22),rgba(15,181,165,0) 70%);animation:floatB 18s ease-in-out infinite}
@keyframes floatA{0%,100%{transform:translate(0,0)}50%{transform:translate(-24px,22px)}}
@keyframes floatB{0%,100%{transform:translate(0,0)}50%{transform:translate(26px,-20px)}}
.hero-grid{
  position:relative;z-index:2;display:grid;grid-template-columns:1.15fr .85fr;gap:44px;align-items:center;
}
.hero h1{font-size:clamp(28px,4.2vw,46px);letter-spacing:1px;margin:18px 0 18px}
.hero h1 em{
  font-style:normal;
  background:linear-gradient(100deg,var(--teal-d),var(--cyan));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-lead{font-size:16.5px;color:var(--ink-3);max-width:560px}
.hero-btns{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px}
.hero-tags{display:flex;flex-wrap:wrap;gap:9px;margin-top:26px}
.hero-tags span{
  font-size:13px;font-weight:600;color:var(--ink-2);
  background:rgba(255,255,255,.78);border:1px solid var(--line);
  padding:6px 12px;border-radius:8px;
}
.hero-panel{
  background:linear-gradient(160deg,rgba(255,255,255,.96),rgba(230,250,247,.9));
  border:1px solid #ccf0eb;border-radius:24px;padding:26px;box-shadow:var(--shadow);
}
.hero-panel h3{font-size:16px;margin-bottom:16px;color:var(--ink)}
.stat-list{display:grid;gap:12px}
.stat-item{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 16px;
  transition:.25s;
}
.stat-item:hover{transform:translateX(4px);border-color:#a8e6df;box-shadow:0 8px 20px rgba(15,150,145,.1)}
.stat-item b{font-size:18px;color:var(--teal-d);letter-spacing:.5px}
.stat-item span{font-size:13.5px;color:var(--ink-3);font-weight:600}
.hero-note{margin-top:16px;font-size:12.5px;color:var(--ink-3);text-align:center}

/* Data metrics */
.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.metric{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px 20px;text-align:center;transition:.3s;box-shadow:var(--shadow);
}
.metric:hover{transform:translateY(-6px);box-shadow:var(--shadow-h);border-color:#abebe3}
.metric strong{display:block;font-size:clamp(22px,2.6vw,30px);color:var(--teal-d);letter-spacing:.5px}
.metric span{display:block;font-size:13.5px;color:var(--ink-3);font-weight:600;margin-top:6px}

/* Cards grid */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:24px;transition:.28s;box-shadow:0 6px 18px rgba(15,90,95,.05);
}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-h);border-color:#aae6df}
.card .ico{
  width:46px;height:46px;border-radius:13px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,rgba(15,181,165,.16),rgba(38,198,218,.16));
  color:var(--teal-d);font-weight:800;font-size:16px;margin-bottom:14px;
}
.card h3{margin-bottom:9px}
.card p{font-size:14.5px}

/* Timeline / flow */
.flow{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;counter-reset:step}
.flow-item{
  background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px 16px;
  position:relative;transition:.28s;
}
.flow-item:hover{transform:translateY(-5px);border-color:#a5e7e0;box-shadow:var(--shadow-h)}
.flow-item::before{
  counter-increment:step;content:counter(step,decimal-leading-zero);
  display:inline-block;font-size:12px;font-weight:800;color:#fff;
  background:linear-gradient(135deg,var(--teal),var(--cyan));
  padding:3px 9px;border-radius:8px;margin-bottom:12px;letter-spacing:1px;
}
.flow-item h4{font-size:15.5px;margin-bottom:6px}
.flow-item p{font-size:13.5px}

/* Table */
.table-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--line);background:#fff;box-shadow:var(--shadow)}
table{width:100%;border-collapse:collapse;min-width:680px}
th,td{padding:15px 18px;text-align:left;font-size:14.5px;border-bottom:1px solid #eef7f6}
thead th{background:linear-gradient(135deg,#e9faf7,#e3f7fb);color:var(--ink);font-weight:800;font-size:14px;letter-spacing:.5px}
tbody tr{transition:.2s}
tbody tr:hover{background:#f7fdfc}
tbody tr:last-child td{border-bottom:none}
td strong{color:var(--teal-d)}

/* Review */
.review-head{
  background:linear-gradient(135deg,#e6faf7,#e3f7fb);border:1px solid #c9efeb;
  border-radius:var(--radius);padding:26px;display:flex;flex-wrap:wrap;align-items:center;
  justify-content:space-between;gap:18px;margin-bottom:26px;
}
.rating-stars{color:#f5a623;font-size:24px;letter-spacing:4px}
.rating-score{font-size:34px;font-weight:800;color:var(--teal-d);line-height:1}
.rating-score small{font-size:14px;color:var(--ink-3);font-weight:600;margin-left:4px}
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.review-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;transition:.28s}
.review-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-h);border-color:#a9e7e0}
.review-card .who{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.avatar{
  width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  font-weight:800;color:#fff;font-size:15px;background:linear-gradient(135deg,var(--teal),var(--cyan));flex-shrink:0;
}
.who b{font-size:14.5px;color:var(--ink);display:block}
.who span{font-size:12.5px;color:var(--ink-3)}
.review-card p{font-size:14px;color:var(--ink-2)}
.review-card .stars{color:#f5a623;font-size:13px;letter-spacing:2px;margin-top:12px}

/* Case / showcase */
.showcase{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.case{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;transition:.28s;display:flex;flex-direction:column;gap:10px}
.case:hover{transform:translateY(-5px);box-shadow:var(--shadow-h);border-color:#aae6df}
.case .tag{align-self:flex-start;font-size:12px;font-weight:700;color:var(--teal-d);background:var(--teal-l);padding:4px 11px;border-radius:7px}
.case h3{font-size:16.5px}
.case p{font-size:14px}

/* Article */
.articles{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.article{
  background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;
  transition:.25s;display:flex;flex-direction:column;gap:8px;
}
.article:hover{transform:translateY(-4px);border-color:#a8e6df;box-shadow:var(--shadow)}
.article span{font-size:12px;color:var(--teal-d);font-weight:700}
.article h4{font-size:15px;line-height:1.5}
.article p{font-size:13.5px}

/* FAQ */
.faq{display:grid;gap:12px}
.faq-item{border:1px solid var(--line);border-radius:14px;background:#fff;overflow:hidden;transition:.25s}
.faq-item:hover{border-color:#a9e7e0}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:17px 20px;background:none;border:none;cursor:pointer;text-align:left;
  font-size:15.5px;font-weight:700;color:var(--ink);font-family:inherit;
}
.faq-q i{
  flex-shrink:0;width:24px;height:24px;border-radius:50%;background:var(--teal-l);color:var(--teal-d);
  display:flex;align-items:center;justify-content:center;font-style:normal;font-size:15px;font-weight:800;
  transition:.3s;
}
.faq-item.open .faq-q i{transform:rotate(45deg);background:var(--teal);color:#fff}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a p{padding:0 20px 18px;font-size:14.5px;color:var(--ink-3)}

/* Form */
.form-section{
  background:linear-gradient(160deg,#ffffff,#eefbf9);
  border:1px solid #cdeee9;border-radius:24px;padding:34px;
  box-shadow:var(--shadow);
}
.form-wrap{display:grid;grid-template-columns:1fr 1.1fr;gap:36px;align-items:start}
.form-info h2{margin-bottom:14px}
.form-info p{font-size:15px;margin-bottom:20px}
.contact-list{display:grid;gap:12px}
.contact-list li{
  display:flex;gap:12px;align-items:flex-start;font-size:14.5px;color:var(--ink-2);
  background:#fff;border:1px solid var(--line);border-radius:12px;padding:13px 15px;
}
.contact-list b{color:var(--teal-d);flex-shrink:0;min-width:76px;font-weight:700}
.kefu-qr{display:flex;align-items:center;gap:14px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:13px 15px}
.kefu-qr img{width:78px;height:78px;object-fit:cover;border-radius:9px;border:1px solid var(--line)}
.kefu-qr div{font-size:13.5px;color:var(--ink-3)}
.kefu-qr b{display:block;font-size:14.5px;color:var(--ink);margin-bottom:3px}
form{display:grid;gap:15px}
.field{display:grid;gap:6px}
.field label{font-size:13.5px;font-weight:700;color:var(--ink-2)}
.field input,.field select,.field textarea{
  width:100%;padding:12px 14px;border-radius:11px;border:1px solid var(--line);
  background:#fff;font-size:14.5px;font-family:inherit;color:var(--ink);transition:.2s;
}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none;border-color:var(--teal);box-shadow:0 0 0 3px rgba(15,181,165,.14);
}
.field textarea{resize:vertical;min-height:104px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:15px}
form .btn{width:100%;margin-top:4px}

/* Links / footer */
.friend-links{display:flex;flex-wrap:wrap;gap:10px}
.friend-links a{
  font-size:13.5px;color:var(--ink-2);background:#fff;border:1px solid var(--line);
  padding:7px 14px;border-radius:9px;transition:.22s;font-weight:600;
}
.friend-links a:hover{color:var(--teal-d);border-color:#a6e6df;transform:translateY(-2px)}

.site-footer{
  background:linear-gradient(180deg,#0f3d43,#0b2f35);
  color:#d3ece9;padding:52px 0 0;margin-top:20px;
}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:32px;padding-bottom:36px}
.footer-brand .brand-txt{color:#fff}
.footer-brand p{color:#9fc4c0;font-size:13.5px;margin-top:14px;max-width:300px}
.footer-col h4{color:#fff;font-size:15px;margin-bottom:14px;font-weight:800}
.footer-col ul{display:grid;gap:9px}
.footer-col ul a,.footer-col ul li{font-size:13.5px;color:#a9ccc8;transition:.2s}
.footer-col ul a:hover{color:#5fe3d2}
.footer-link-group{display:flex;flex-wrap:wrap;gap:9px}
.footer-link-group a{
  font-size:13px;color:#a9ccc8;background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.12);padding:6px 12px;border-radius:8px;transition:.22s;
}
.footer-link-group a:hover{color:#5fe3d2;border-color:rgba(95,227,210,.5);background:rgba(95,227,210,.08)}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);padding:20px 0;
  display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;
  font-size:13px;color:#8fb5b1;
}
.footer-bottom a{color:#8fb5b1;transition:.2s}
.footer-bottom a:hover{color:#5fe3d2}

/* Floating */
.float-box{position:fixed;right:18px;bottom:24px;z-index:60;display:flex;flex-direction:column;gap:10px}
.float-btn{
  width:50px;height:50px;border-radius:14px;border:none;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--teal),var(--cyan));color:#fff;
  box-shadow:0 10px 24px rgba(15,150,145,.35);transition:.25s;
  font-size:13px;font-weight:800;
}
.float-btn:hover{transform:translateY(-3px) scale(1.05)}
.float-btn.top{background:#fff;color:var(--teal-d);border:1px solid var(--line);font-size:18px}
.kefu-pop{
  position:fixed;right:18px;bottom:86px;z-index:61;width:220px;
  background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px;
  box-shadow:0 20px 44px rgba(10,70,75,.2);
  opacity:0;visibility:hidden;transform:translateY(12px);transition:.28s;
}
.kefu-pop.show{opacity:1;visibility:visible;transform:translateY(0)}
.kefu-pop img{border-radius:10px;margin:8px auto;width:150px;height:150px;object-fit:cover}
.kefu-pop p{font-size:13px;text-align:center;color:var(--ink-2)}

/* Animation */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* Responsive */
@media(max-width:1024px){
  .hero-grid{grid-template-columns:1fr;gap:34px}
  .grid-3,.showcase,.review-grid,.articles{grid-template-columns:repeat(2,1fr)}
  .flow{grid-template-columns:repeat(3,1fr)}
  .metrics{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .form-wrap{grid-template-columns:1fr}
}
@media(max-width:860px){
  .nav-links{
    position:absolute;left:0;right:0;top:100%;flex-direction:column;align-items:stretch;
    background:#f7fdfc;border-bottom:1px solid var(--line);padding:10px 16px 18px;
    box-shadow:0 18px 30px rgba(10,70,75,.08);
    max-height:0;overflow:hidden;opacity:0;visibility:hidden;transition:.3s;
  }
  .nav-links.open{max-height:560px;overflow-y:auto;opacity:1;visibility:visible}
  .nav-links li a{padding:12px 10px;border-bottom:1px solid #eaf6f4}
  .menu-toggle{display:flex}
  .nav-actions .btn{display:none}
  .site-header .nav{position:relative}
}
@media(max-width:720px){
  section{padding:46px 0}
  .grid-3,.showcase,.review-grid,.articles{grid-template-columns:1fr}
  .flow{grid-template-columns:repeat(2,1fr)}
  .metrics{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr}
  .form-section{padding:22px}
  .form-row{grid-template-columns:1fr}
  .hero{padding:52px 0 58px}
  .review-head{padding:20px}
  .footer-bottom{justify-content:center;text-align:center}
}
@media(max-width:420px){
  .flow{grid-template-columns:1fr}
  .metrics{grid-template-columns:1fr}
  .hero-btns .btn{width:100%}
}