:root{
  --brand:#0b6bff;--brand-2:#4d8dff;--brand-soft:#e8f0ff;
  --ink:#0f172a;--ink-2:#334155;--ink-3:#64748b;
  --bg:#f5f7fb;--card:#ffffff;--line:#e5e9f2;
  --gold:#ffb020;--ok:#10b981;--warn:#ef4444;
  --shadow:0 6px 24px rgba(15,23,42,.08);
  --shadow-lg:0 18px 48px rgba(15,23,42,.14);
  --radius:14px;--radius-lg:22px;
  --font:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:var(--font);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--brand);text-decoration:none}
img{max-width:100%;display:block}
.container{max-width:1180px;margin:0 auto;padding:0 20px}

/* Header */
.nav{position:sticky;top:0;background:rgba(255,255,255,.85);backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);z-index:50;border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px;color:var(--ink)}
.logo-mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--brand),#8ab6ff);display:grid;place-items:center;color:#fff;font-weight:900}
.menu{display:flex;gap:24px;align-items:center}
.menu a{color:var(--ink-2);font-size:15px;padding:6px 2px;border-bottom:2px solid transparent;transition:.2s}
.menu a:hover,.menu a.active{color:var(--brand);border-color:var(--brand)}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 20px;border-radius:10px;background:var(--brand);color:#fff;font-weight:600;border:0;cursor:pointer;transition:.2s;font-size:15px}
.btn:hover{background:#0956d8;transform:translateY(-1px);box-shadow:var(--shadow)}
.btn-ghost{background:transparent;color:var(--brand);border:1px solid var(--brand)}
.btn-ghost:hover{background:var(--brand-soft)}
.btn-lg{padding:14px 28px;font-size:16px;border-radius:12px}
.menu-toggle{display:none;background:none;border:none;font-size:22px;color:var(--ink)}

/* Hero */
.hero{padding:70px 0 60px;background:linear-gradient(180deg,#eef4ff 0%,#f7faff 100%)}
.hero-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:44px;align-items:center}
.hero h1{font-size:44px;line-height:1.2;margin:0 0 18px;color:var(--ink);letter-spacing:-.5px}
.hero h1 em{color:var(--brand);font-style:normal;background:linear-gradient(120deg,var(--brand),#4d8dff);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lead{font-size:17px;color:var(--ink-2);margin-bottom:26px}
.hero .cta{display:flex;gap:14px;flex-wrap:wrap}
.hero .stats{display:flex;gap:40px;margin-top:38px}
.hero .stats .n{font-size:26px;font-weight:800;color:var(--brand)}
.hero .stats .l{font-size:13px;color:var(--ink-3)}
.hero-img{border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-lg);aspect-ratio:5/4;background:#fff}
.hero-img img{width:100%;height:100%;object-fit:cover}

/* Section */
.section{padding:64px 0}
.section-title{text-align:center;margin-bottom:40px}
.section-title .k{color:var(--brand);font-size:14px;font-weight:600;letter-spacing:2px;text-transform:uppercase}
.section-title h2{font-size:32px;margin:8px 0 10px;color:var(--ink);letter-spacing:-.3px}
.section-title p{color:var(--ink-3);font-size:15px;max-width:640px;margin:0 auto}

/* Cards */
.grid{display:grid;gap:22px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--card);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);transition:.2s;border:1px solid transparent}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--brand-soft)}
.feature .icon{width:52px;height:52px;border-radius:12px;background:var(--brand-soft);color:var(--brand);display:grid;place-items:center;font-size:22px;margin-bottom:14px}
.feature h3{margin:0 0 6px;font-size:17px}
.feature p{color:var(--ink-3);font-size:14px;margin:0}

/* Product / service card */
.service-card{cursor:pointer;overflow:hidden;padding:0}
.service-card .thumb{aspect-ratio:16/10;overflow:hidden;background:#eef2f7}
.service-card .thumb img{width:100%;height:100%;object-fit:cover;transition:.35s}
.service-card:hover .thumb img{transform:scale(1.06)}
.service-card .body{padding:18px 20px 22px}
.service-card .tag{display:inline-block;font-size:12px;background:var(--brand-soft);color:var(--brand);padding:3px 10px;border-radius:99px;margin-bottom:8px}
.service-card h3{margin:0 0 6px;font-size:17px}
.service-card p{color:var(--ink-3);font-size:14px;margin:0 0 14px;height:44px;overflow:hidden}
.service-card .price-row{display:flex;justify-content:space-between;align-items:center}
.service-card .price{font-size:22px;font-weight:800;color:var(--warn)}
.service-card .price .unit{font-size:12px;color:var(--ink-3);font-weight:500;margin-left:4px}
.service-card .go{color:var(--brand);font-size:14px;font-weight:600}

/* Detail page */
.detail{padding:40px 0 30px}
.detail-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:36px;align-items:start}
.gallery .main-img{aspect-ratio:4/3;background:#eef2f7;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.gallery .main-img img{width:100%;height:100%;object-fit:cover}
.gallery .thumbs{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:12px}
.gallery .thumbs img{aspect-ratio:1/1;object-fit:cover;border-radius:8px;cursor:pointer;border:2px solid transparent;transition:.2s}
.gallery .thumbs img:hover{border-color:var(--brand)}
.detail-info h1{margin:0 0 8px;font-size:26px;line-height:1.3}
.detail-info .subline{color:var(--ink-3);font-size:14px;margin-bottom:22px}
.price-box{background:linear-gradient(135deg,#fff7e6,#ffefd0);padding:20px 22px;border-radius:14px;margin-bottom:20px}
.price-box .old{color:#a8a29e;text-decoration:line-through;font-size:14px}
.price-box .now{color:var(--warn);font-size:32px;font-weight:800;margin:2px 0 0}
.price-box .now .unit{font-size:14px;color:var(--ink-3);font-weight:500;margin-left:6px}
.price-box .note{font-size:13px;color:var(--ink-3);margin-top:6px}
.spec{display:grid;grid-template-columns:auto 1fr;gap:12px 22px;font-size:14px;margin-bottom:22px}
.spec dt{color:var(--ink-3)}
.spec dd{margin:0;color:var(--ink)}
.detail-actions{display:flex;gap:12px}

/* Tabs */
.tabs{margin-top:44px;background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.tabs-head{display:flex;border-bottom:1px solid var(--line);background:#fafbfd}
.tabs-head .tab{flex:1;padding:16px 20px;text-align:center;cursor:pointer;font-weight:600;color:var(--ink-3);border-bottom:3px solid transparent;transition:.2s;font-size:15px}
.tabs-head .tab.active{color:var(--brand);border-color:var(--brand);background:#fff}
.tabs-body{padding:28px 30px}
.tabs-body .pane{display:none}
.tabs-body .pane.active{display:block}
.tabs-body h3{margin-top:0}
.tabs-body ul{padding-left:22px;line-height:2}

/* Reviews */
.reviews{display:grid;gap:16px}
.review{padding:16px 18px;background:#fafbfd;border-radius:12px;border-left:3px solid var(--brand)}
.review-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px}
.review-head .name{font-weight:600}
.review-head .stars{color:var(--gold)}
.review .txt{color:var(--ink-2);font-size:14px;margin:2px 0}
.review .time{color:var(--ink-3);font-size:12px}

/* Order / form */
.order-wrap{display:grid;grid-template-columns:1.4fr 1fr;gap:30px;align-items:start}
.form-card{background:#fff;padding:28px 30px;border-radius:var(--radius);box-shadow:var(--shadow)}
.form-card h2{margin:0 0 20px;font-size:22px}
.field{margin-bottom:18px}
.field label{display:block;font-size:14px;color:var(--ink-2);margin-bottom:6px;font-weight:500}
.field .req{color:var(--warn);margin-left:2px}
.input,.select,.textarea{width:100%;padding:11px 14px;border:1px solid var(--line);border-radius:10px;background:#fafbfd;font-size:15px;font-family:inherit;color:var(--ink);transition:.2s}
.input:focus,.select:focus,.textarea:focus{outline:none;border-color:var(--brand);background:#fff;box-shadow:0 0 0 3px var(--brand-soft)}
.textarea{min-height:96px;resize:vertical}
.hint{font-size:12px;color:var(--ink-3);margin-top:4px}
.pay-methods{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.pay-methods label{display:flex;align-items:center;gap:10px;padding:14px;border:2px solid var(--line);border-radius:12px;cursor:pointer;transition:.15s;background:#fafbfd}
.pay-methods label:has(input:checked),.pay-methods label.on{border-color:var(--brand);background:var(--brand-soft)}
.pay-methods input{margin:0}
.pay-methods .icon{width:34px;height:34px;border-radius:8px;display:grid;place-items:center;color:#fff;font-weight:900;font-size:14px}
.pay-alipay{background:#1677ff}
.pay-wechat{background:#09bb07}
.pay-bank{background:#8b5cf6}
.summary{background:#fff;padding:24px;border-radius:var(--radius);box-shadow:var(--shadow);position:sticky;top:80px}
.summary h3{margin:0 0 16px}
.summary .row{display:flex;justify-content:space-between;padding:10px 0;font-size:14px;color:var(--ink-2);border-bottom:1px dashed var(--line)}
.summary .row.total{border:0;padding-top:16px;font-size:20px;font-weight:700;color:var(--ink);align-items:center}
.summary .row.total .amt{color:var(--warn);font-size:26px}

/* News / articles */
.article-card{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;transition:.2s}
.article-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.article-card .thumb{aspect-ratio:16/9;background:#eef2f7}
.article-card .thumb img{width:100%;height:100%;object-fit:cover}
.article-card .body{padding:18px 20px}
.article-card h3{margin:0 0 6px;font-size:16px}
.article-card p{color:var(--ink-3);font-size:13px;margin:0 0 10px}
.article-card .meta{font-size:12px;color:var(--ink-3)}

/* About */
.about-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:44px;align-items:center}
.about-grid img{border-radius:var(--radius-lg);box-shadow:var(--shadow-lg)}
.milestone{display:grid;gap:14px}
.milestone .item{display:flex;gap:16px;padding:14px 16px;background:#fafbfd;border-radius:12px}
.milestone .yr{color:var(--brand);font-weight:800;font-size:18px;min-width:60px}
.milestone .t{color:var(--ink-2);font-size:14px}
.team-card{text-align:center}
.team-card img{width:96px;height:96px;border-radius:50%;margin:0 auto 12px;object-fit:cover}
.team-card h4{margin:0 0 4px;font-size:16px}
.team-card p{color:var(--ink-3);font-size:13px;margin:0}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1.4fr;gap:34px}
.contact-info{background:linear-gradient(160deg,var(--brand),#4d8dff);color:#fff;padding:36px 30px;border-radius:var(--radius);box-shadow:var(--shadow)}
.contact-info h2{margin:0 0 20px}
.contact-info .row{margin-bottom:16px;display:flex;gap:12px;align-items:flex-start;font-size:14px;opacity:.95}
.contact-info .row .k{opacity:.75;min-width:64px}

/* Policy / long text */
.doc{background:#fff;padding:44px 48px;border-radius:var(--radius);box-shadow:var(--shadow);color:var(--ink-2);font-size:15px;line-height:1.9}
.doc h1{margin:0 0 8px;font-size:26px;color:var(--ink)}
.doc h2{font-size:19px;margin-top:32px;color:var(--ink)}
.doc .meta{color:var(--ink-3);font-size:13px;margin-bottom:20px}

/* Floating buttons */
.float{position:fixed;right:24px;z-index:60;width:52px;height:52px;border-radius:50%;box-shadow:var(--shadow-lg);cursor:pointer;display:grid;place-items:center;color:#fff;border:none;transition:.2s}
.float:hover{transform:translateY(-3px)}
.float-chat{bottom:110px;background:linear-gradient(135deg,var(--brand),#4d8dff)}
.float-top{bottom:40px;background:#fff;color:var(--brand);border:1px solid var(--line)}
.float-top.hide{opacity:0;pointer-events:none;transform:translateY(20px)}

/* Chat panel */
.chat-panel{position:fixed;right:24px;bottom:180px;width:320px;background:#fff;border-radius:16px;box-shadow:var(--shadow-lg);z-index:70;display:none;overflow:hidden}
.chat-panel.show{display:block}
.chat-head{padding:14px 18px;background:linear-gradient(135deg,var(--brand),#4d8dff);color:#fff;display:flex;justify-content:space-between;align-items:center}
.chat-head h4{margin:0;font-size:15px}
.chat-close{background:none;border:none;color:#fff;font-size:20px;cursor:pointer}
.chat-body{padding:14px;height:260px;overflow-y:auto;background:#fafbfd}
.chat-msg{max-width:80%;padding:9px 13px;border-radius:12px;margin-bottom:10px;font-size:13px}
.chat-msg.bot{background:#fff;border:1px solid var(--line);color:var(--ink-2);border-top-left-radius:4px}
.chat-msg.me{background:var(--brand);color:#fff;margin-left:auto;border-top-right-radius:4px}
.chat-input{display:flex;gap:8px;padding:10px;border-top:1px solid var(--line);background:#fff}
.chat-input input{flex:1;border:1px solid var(--line);border-radius:8px;padding:8px 10px;font-size:13px;outline:none}
.chat-input button{background:var(--brand);color:#fff;border:none;padding:0 14px;border-radius:8px;cursor:pointer;font-size:13px}

/* Footer */
.footer{background:#0f172a;color:#94a3b8;padding:52px 0 22px;margin-top:60px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px;margin-bottom:34px}
.footer h4{color:#fff;font-size:15px;margin:0 0 14px}
.footer a{color:#94a3b8;font-size:13px;display:block;margin-bottom:8px;transition:.15s}
.footer a:hover{color:#fff}
.footer .brand-line{font-size:16px;color:#fff;font-weight:700;margin-bottom:10px}
.footer p{font-size:13px;line-height:1.9;margin:6px 0}
.footer-bottom{border-top:1px solid #1e293b;padding-top:20px;font-size:13px;color:#64748b;text-align:center;line-height:2}
.footer-bottom a{color:#94a3b8;display:inline}

/* Result page */
.result{background:#fff;border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);text-align:center;padding:60px 40px;margin:60px auto;max-width:520px}
.result .icon{width:80px;height:80px;border-radius:50%;background:linear-gradient(135deg,#10b981,#34d399);margin:0 auto 22px;display:grid;place-items:center;color:#fff;font-size:38px}
.result h1{margin:0 0 8px;font-size:26px}
.result .sub{color:var(--ink-3);margin-bottom:26px}
.result .info{background:#fafbfd;padding:20px;border-radius:12px;text-align:left;font-size:14px;color:var(--ink-2);margin-bottom:22px}
.result .info .row{display:flex;justify-content:space-between;padding:6px 0}

/* Responsive */
@media (max-width:900px){
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}
  .hero-grid{grid-template-columns:1fr}
  .hero h1{font-size:32px}
  .detail-grid,.order-wrap,.about-grid,.contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .doc{padding:28px 22px}
  .menu{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;padding:16px 20px;box-shadow:var(--shadow);border-top:1px solid var(--line)}
  .menu.open{display:flex}
  .menu-toggle{display:block}
  .pay-methods{grid-template-columns:1fr}
  .summary{position:static}
}
@media (max-width:560px){
  .grid-3,.grid-4,.grid-2{grid-template-columns:1fr}
  .hero{padding:40px 0}
  .hero h1{font-size:26px}
  .section{padding:44px 0}
  .hero .stats{gap:20px}
  .section-title h2{font-size:24px}
  .container{padding:0 16px}
  .result{margin:30px 16px;padding:44px 24px}
}