:root{
  --bg:#f6f8fb;--bg-2:#eef2f8;--card:#ffffff;--ink:#0f1b2d;--ink-2:#3b4a63;--muted:#697691;
  --brand:#1957e6;--brand-2:#0aa27a;--brand-3:#ff7a1a;--line:#e3e9f2;--shadow:0 10px 30px rgba(23,45,90,.08);
  --radius:14px;--radius-lg:22px;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:var(--brand);text-decoration:none}a:hover{opacity:.85}
img{max-width:100%;display:block}
.container{max-width:1180px;margin:0 auto;padding:0 20px}

/* Nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.9);backdrop-filter:saturate(160%) blur(14px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--ink);font-size:18px}
.brand-mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,#1957e6,#0aa27a);display:grid;place-items:center;color:#fff;font-weight:800}
.nav-links{display:flex;gap:26px;align-items:center}
.nav-links a{color:var(--ink-2);font-size:15px;font-weight:500}
.nav-links a.active,.nav-links a:hover{color:var(--brand)}
.nav-cta{background:var(--brand);color:#fff!important;padding:9px 18px;border-radius:10px;font-weight:600}
.burger{display:none;font-size:22px;background:none;border:0;color:var(--ink)}

/* Hero */
.hero{padding:64px 0 40px;background:linear-gradient(180deg,#eaf0fb 0%,var(--bg) 90%)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center}
.hero h1{font-size:42px;line-height:1.2;margin:0 0 18px;letter-spacing:-.5px}
.hero h1 em{font-style:normal;background:linear-gradient(90deg,#1957e6,#0aa27a);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{color:var(--ink-2);font-size:17px;margin:0 0 22px}
.hero .cta{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-block;padding:12px 22px;border-radius:11px;font-weight:600;font-size:15px;border:0;cursor:pointer;transition:transform .15s}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--brand);color:#fff}
.btn-ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}
.btn-orange{background:var(--brand-3);color:#fff}
.hero-img{border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow);aspect-ratio:5/4;background:#dfe6f2}
.hero-img img{width:100%;height:100%;object-fit:cover}
.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:44px}
.metric{background:#fff;border-radius:var(--radius);padding:18px;text-align:center;border:1px solid var(--line)}
.metric b{display:block;font-size:26px;color:var(--brand);margin-bottom:4px}
.metric span{color:var(--muted);font-size:13px}

/* Section */
.section{padding:64px 0}
.section.alt{background:var(--bg-2)}
.sec-head{text-align:center;margin-bottom:40px}
.sec-head .kicker{color:var(--brand);font-size:13px;font-weight:600;letter-spacing:2px;text-transform:uppercase}
.sec-head h2{font-size:32px;margin:8px 0 10px;letter-spacing:-.3px}
.sec-head p{color:var(--muted);max-width:640px;margin:0 auto;font-size:15px}

/* Card grids */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}

/* Feature card */
.feature{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:.2s}
.feature:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.feature .ico{width:44px;height:44px;border-radius:11px;background:linear-gradient(135deg,#e6efff,#dcf6ec);display:grid;place-items:center;color:var(--brand);font-size:22px;margin-bottom:14px}
.feature h3{margin:0 0 8px;font-size:18px}
.feature p{color:var(--ink-2);margin:0;font-size:14px}

/* Product card */
.product{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.2s;display:flex;flex-direction:column}
.product:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.product .cover{aspect-ratio:16/10;background:#e8eef8;overflow:hidden}
.product .cover img{width:100%;height:100%;object-fit:cover;transition:.4s}
.product:hover .cover img{transform:scale(1.05)}
.product .body{padding:18px 18px 20px;display:flex;flex-direction:column;gap:8px;flex:1}
.product .tag{display:inline-block;background:#eaf1ff;color:var(--brand);font-size:12px;font-weight:600;padding:3px 9px;border-radius:6px;align-self:flex-start}
.product h3{margin:2px 0;font-size:17px}
.product .desc{color:var(--muted);font-size:13.5px;flex:1}
.product .foot{display:flex;justify-content:space-between;align-items:center;margin-top:8px;padding-top:12px;border-top:1px dashed var(--line)}
.product .price{color:var(--brand-3);font-weight:700;font-size:20px}
.product .price small{color:var(--muted);font-weight:400;font-size:12px;margin-left:2px}
.product .go{color:var(--brand);font-size:13px;font-weight:600}

/* Detail */
.detail-wrap{display:grid;grid-template-columns:1fr 340px;gap:36px}
.detail .main-img{border-radius:var(--radius-lg);overflow:hidden;aspect-ratio:16/9;background:#e6ecf7;margin-bottom:20px}
.detail .main-img img{width:100%;height:100%;object-fit:cover}
.thumbs{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:24px}
.thumbs .th{aspect-ratio:1;border-radius:10px;overflow:hidden;border:1px solid var(--line)}
.thumbs .th img{width:100%;height:100%;object-fit:cover}
.detail h1{font-size:28px;margin:0 0 8px}
.detail .badges{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px}
.badge{background:#eaf1ff;color:var(--brand);padding:4px 10px;border-radius:6px;font-size:12px;font-weight:600}
.badge.g{background:#e5f7ee;color:var(--brand-2)}
.badge.o{background:#fff2e6;color:var(--brand-3)}
.detail .meta{color:var(--muted);font-size:14px;margin-bottom:16px}
.tab-bar{display:flex;gap:24px;border-bottom:1px solid var(--line);margin:20px 0 16px}
.tab-bar b{padding:10px 0;border-bottom:2px solid var(--brand);color:var(--brand)}
.tab-bar span{padding:10px 0;color:var(--muted);cursor:default}
.feat-list{padding-left:20px;color:var(--ink-2);font-size:14.5px}
.feat-list li{margin:6px 0}
.side{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;position:sticky;top:80px;height:max-content}
.side .price-big{font-size:34px;color:var(--brand-3);font-weight:800;margin:6px 0 4px}
.side .price-big small{font-size:14px;color:var(--muted);font-weight:400;margin-left:4px}
.side .price-old{color:var(--muted);text-decoration:line-through;font-size:14px;margin-bottom:14px}
.side .row{display:flex;justify-content:space-between;color:var(--ink-2);font-size:14px;padding:8px 0;border-bottom:1px dashed var(--line)}
.side .row:last-of-type{border:0}
.side .btn{width:100%;margin-top:16px;padding:14px}
.side .subtxt{font-size:12px;color:var(--muted);text-align:center;margin-top:10px}
.spec-table{width:100%;border-collapse:collapse;margin:12px 0;font-size:14px}
.spec-table td{padding:10px 12px;border:1px solid var(--line)}
.spec-table td:first-child{background:#f7f9fd;color:var(--muted);width:35%}

/* Reviews */
.reviews{margin-top:36px}
.review{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 18px;margin-bottom:12px}
.review .r-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px}
.review .who{font-weight:600;font-size:14.5px}
.review .stars{color:#f5a623;font-size:14px;letter-spacing:2px}
.review .time{color:var(--muted);font-size:12px}
.review p{color:var(--ink-2);margin:4px 0 0;font-size:14px}

/* Order */
.order-wrap{display:grid;grid-template-columns:1fr 380px;gap:30px}
.form-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.form-card h2{margin-top:0}
.field{margin-bottom:18px}
.field label{display:block;font-size:13.5px;color:var(--ink-2);margin-bottom:6px;font-weight:500}
.field input,.field select,.field textarea{width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:10px;font-size:14.5px;background:#fbfcfe;font-family:inherit}
.field input:focus,.field select:focus,.field textarea:focus{outline:0;border-color:var(--brand);background:#fff}
.pay-opts{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.pay-opt{border:1px solid var(--line);border-radius:10px;padding:12px;text-align:center;cursor:pointer;background:#fbfcfe;font-size:14px}
.pay-opt input{display:none}
.pay-opt.on{border-color:var(--brand);background:#eaf1ff;color:var(--brand);font-weight:600}
.summary{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;position:sticky;top:80px;height:max-content}
.summary h3{margin:0 0 14px}
.summary .row{display:flex;justify-content:space-between;padding:9px 0;color:var(--ink-2);font-size:14px}
.summary .row.total{border-top:1px solid var(--line);margin-top:8px;padding-top:14px;font-size:18px;font-weight:700;color:var(--ink)}
.summary .row.total b{color:var(--brand-3)}
.summary .btn{width:100%;margin-top:14px}

/* About / contact */
.about-hero{padding:60px 0 30px;background:linear-gradient(135deg,#eaf0fb,#dcf6ec)}
.about-hero h1{font-size:36px;margin:0 0 14px}
.about-hero p{color:var(--ink-2);font-size:16px;max-width:720px}
.mission-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:36px;align-items:center}
.mission-grid img{border-radius:var(--radius-lg);box-shadow:var(--shadow)}
.contact-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:32px}
.contact-info li{display:flex;gap:14px;padding:16px 0;border-bottom:1px solid var(--line);align-items:flex-start;list-style:none}
.contact-info{padding:0}
.contact-info .ico{width:40px;height:40px;border-radius:10px;background:#eaf1ff;color:var(--brand);display:grid;place-items:center;flex:none}
.contact-info h4{margin:0 0 4px;font-size:15px}
.contact-info span{color:var(--muted);font-size:13.5px}

/* Legal */
.doc{background:#fff;border-radius:var(--radius);padding:36px 40px;box-shadow:var(--shadow)}
.doc h2{border-bottom:1px solid var(--line);padding-bottom:10px}
.doc h3{margin-top:22px;font-size:17px}
.doc p,.doc li{color:var(--ink-2);font-size:14.5px}

/* Footer */
footer{background:#0f1b2d;color:#b7c2d6;padding:48px 0 20px;margin-top:60px}
footer a{color:#b7c2d6}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px;margin-bottom:26px}
.foot-grid h4{color:#fff;margin:0 0 12px;font-size:15px}
.foot-grid p,.foot-grid li,.foot-grid a{font-size:13.5px;line-height:1.9;list-style:none;padding:0;margin:0}
.foot-bot{border-top:1px solid #1f2c44;padding-top:16px;text-align:center;font-size:13px;color:#8899b3}
.foot-bot a{color:#b7c2d6;text-decoration:underline}

/* Float buttons */
.float-btn{position:fixed;right:22px;width:52px;height:52px;border-radius:50%;background:var(--brand);color:#fff;display:grid;place-items:center;box-shadow:0 8px 22px rgba(25,87,230,.35);cursor:pointer;z-index:40;border:0;transition:.2s}
.float-btn:hover{transform:translateY(-2px);background:#1249c2}
.float-btn.top{bottom:24px;background:#fff;color:var(--brand);border:1px solid var(--line)}
.float-btn.chat{bottom:96px}
.chatbox{position:fixed;right:22px;bottom:160px;width:320px;max-width:calc(100vw - 44px);background:#fff;border-radius:14px;box-shadow:0 20px 50px rgba(15,27,45,.2);display:none;z-index:41;overflow:hidden;border:1px solid var(--line)}
.chatbox.on{display:block}
.chat-hd{background:var(--brand);color:#fff;padding:14px 16px;font-weight:600;display:flex;justify-content:space-between;align-items:center}
.chat-hd .x{cursor:pointer;font-size:20px;line-height:1}
.chat-body{padding:14px;max-height:280px;overflow-y:auto;font-size:14px}
.chat-msg{background:#f0f4fb;padding:10px 12px;border-radius:10px;margin-bottom:8px;color:var(--ink-2)}
.chat-msg.u{background:#eaf1ff;color:var(--brand);text-align:right}
.chat-input{border-top:1px solid var(--line);display:flex}
.chat-input input{flex:1;border:0;padding:12px 14px;font-size:14px;outline:0;font-family:inherit}
.chat-input button{border:0;background:var(--brand);color:#fff;padding:0 18px;cursor:pointer;font-size:14px;font-weight:600}

/* Responsive */
@media(max-width:900px){
  .hero-grid,.detail-wrap,.order-wrap,.contact-grid,.mission-grid,.grid-3,.grid-4,.grid-2{grid-template-columns:1fr}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .hero{padding:40px 0 20px}.hero h1{font-size:30px}
  .metrics{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:repeat(2,1fr)}
  .side,.summary{position:static}
  .nav-links{display:none;position:absolute;top:66px;left:0;right:0;background:#fff;flex-direction:column;padding:14px 20px;border-bottom:1px solid var(--line);gap:14px}
  .nav-links.open{display:flex}
  .burger{display:block}
  .doc{padding:24px}
  .section{padding:44px 0}
}
@media(max-width:520px){
  .grid-4{grid-template-columns:1fr}
  .pay-opts{grid-template-columns:1fr}
  .thumbs{grid-template-columns:repeat(3,1fr)}
}