:root{
  --navy:#0A2540; --navy2:#0d2f52; --teal:#0891B2; --cyan:#06B6D4;
  --bg:#F8FAFC; --card:#fff; --text:#1e293b; --muted:#64748b; --line:#e2e8f0;
  --green:#25D366; --amber:#f59e0b;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--text);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}

/* language toggle */
[lang="zh"]{display:none}
html.show-zh [lang="en"]{display:none}
html.show-zh [lang="zh"]{display:inline}
html.show-zh [lang="zh"].block{display:block}

/* header */
header{position:sticky;top:0;z-index:100;background:var(--navy);color:#fff;box-shadow:0 2px 12px rgba(10,37,64,.18)}
.nav{max-width:1200px;margin:0 auto;padding:0 22px;height:68px;display:flex;align-items:center;gap:28px}
.logo{font-weight:800;font-size:1.32rem;letter-spacing:.5px;display:flex;align-items:center;gap:9px}
.logo .mark{width:30px;height:30px;border-radius:7px;background:linear-gradient(135deg,var(--teal),var(--cyan));
  display:flex;align-items:center;justify-content:center;font-size:.82rem;font-weight:900;color:#fff}
.nav-links{display:flex;gap:24px;margin-left:auto;font-size:.94rem}
.nav-links a{opacity:.88;transition:.2s;padding:6px 0;border-bottom:2px solid transparent}
.nav-links a:hover{opacity:1;border-bottom-color:var(--cyan)}
.lang-btn{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.28);color:#fff;border-radius:7px;
  padding:6px 13px;cursor:pointer;font-size:.86rem;font-weight:600;transition:.2s}
.lang-btn:hover{background:rgba(255,255,255,.22)}
.burger{display:none;background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer}

/* hero */
.hero{background:linear-gradient(135deg,#0A2540 0%,#0d2f52 45%,#0891B2 130%);color:#fff;padding:86px 22px 76px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-140px;top:-110px;width:460px;height:460px;border-radius:50%;
  background:radial-gradient(circle,rgba(6,182,212,.30),transparent 68%)}
.hero-in{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:1.12fr .88fr;gap:52px;align-items:center;position:relative;z-index:2}
.eyebrow{display:inline-block;background:rgba(6,182,212,.16);border:1px solid rgba(6,182,212,.42);color:#7dd3fc;
  padding:6px 15px;border-radius:100px;font-size:.79rem;font-weight:700;letter-spacing:1.1px;margin-bottom:20px}
.hero h1{font-size:2.85rem;line-height:1.16;font-weight:800;letter-spacing:-.6px;margin-bottom:18px}
.hero h1 em{font-style:normal;background:linear-gradient(90deg,#22d3ee,#5eead4);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero p{font-size:1.09rem;color:#cbd5e1;max-width:560px;margin-bottom:30px}
.cta-row{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:9px;padding:13px 27px;border-radius:9px;font-weight:700;font-size:.96rem;
  transition:.25s;cursor:pointer;border:none}
.btn-primary{background:linear-gradient(135deg,var(--teal),var(--cyan));color:#fff;box-shadow:0 6px 22px rgba(8,145,178,.38)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(8,145,178,.5)}
.btn-ghost{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.32);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.2)}
.btn-wa{background:var(--green);color:#fff}
.btn-wa:hover{transform:translateY(-2px);box-shadow:0 10px 26px rgba(37,211,102,.45)}
.hero-img{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.16);border-radius:18px;padding:18px;backdrop-filter:blur(6px)}
.hero-img img{border-radius:11px;width:100%}

/* trust bar */
.trust{background:#fff;border-bottom:1px solid var(--line)}
.trust-in{max-width:1200px;margin:0 auto;padding:22px;display:grid;grid-template-columns:repeat(4,1fr);gap:18px;text-align:center}
.trust b{display:block;font-size:1.5rem;color:var(--navy);font-weight:800;line-height:1.2}
.trust span{font-size:.83rem;color:var(--muted)}

/* sections */
section{padding:72px 22px}
.wrap{max-width:1200px;margin:0 auto}
.sec-head{text-align:center;margin-bottom:46px}
.sec-head h2{font-size:2.05rem;font-weight:800;color:var(--navy);letter-spacing:-.4px;margin-bottom:11px}
.sec-head p{color:var(--muted);max-width:660px;margin:0 auto;font-size:1.02rem}
.sec-head .kicker{display:block;color:var(--teal);font-weight:800;font-size:.79rem;letter-spacing:1.6px;text-transform:uppercase;margin-bottom:10px}

/* product grid */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(275px,1fr));gap:26px}
.card{background:var(--card);border:1px solid var(--line);border-radius:15px;overflow:hidden;transition:.28s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-5px);box-shadow:0 16px 40px rgba(10,37,64,.13);border-color:#bfdbfe}
.card-img{background:#f1f5f9;padding:22px;display:flex;align-items:center;justify-content:center;min-height:216px}
.card-img img{max-height:182px;width:auto;object-fit:contain}
.card-body{padding:20px;flex:1;display:flex;flex-direction:column}
.card h3{font-size:1.13rem;color:var(--navy);margin-bottom:7px;font-weight:700}
.card p{font-size:.89rem;color:var(--muted);margin-bottom:14px;flex:1}
.tagrow{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:13px}
.tag{background:#e0f2fe;color:#0369a1;font-size:.73rem;font-weight:700;padding:4px 11px;border-radius:100px}
.tag.hot{background:#dcfce7;color:#15803d}
.card-link{color:var(--teal);font-weight:700;font-size:.9rem}

/* feature cards */
.feats{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:22px}
.feat{background:#fff;border:1px solid var(--line);border-left:4px solid var(--teal);border-radius:12px;padding:26px}
.feat .ico{font-size:1.85rem;margin-bottom:12px}
.feat h3{font-size:1.05rem;color:var(--navy);margin-bottom:8px}
.feat p{font-size:.9rem;color:var(--muted)}

/* local advantage (dark) */
.local{background:var(--navy);color:#fff}
.local h2{color:#fff}
.local .sec-head p{color:#94a3b8}
.local-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:44px;align-items:center}
.local-list{list-style:none;display:flex;flex-direction:column;gap:16px}
.local-list li{display:flex;gap:14px;align-items:flex-start}
.local-list .ck{flex:0 0 26px;height:26px;border-radius:7px;background:rgba(6,182,212,.18);color:#22d3ee;
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:.85rem}
.local-list b{display:block;font-size:1rem;margin-bottom:3px}
.local-list span{font-size:.89rem;color:#94a3b8}
.addr-box{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:14px;padding:24px}
.addr-box h4{color:#22d3ee;font-size:.79rem;letter-spacing:1.4px;text-transform:uppercase;margin-bottom:13px}
.addr-box p{font-size:.93rem;color:#cbd5e1;margin-bottom:9px}
.addr-box .big{color:#fff;font-weight:700;font-size:1.02rem}

/* certifications */
.certs{display:grid;grid-template-columns:repeat(auto-fit,minmax(155px,1fr));gap:16px}
.cert{background:#fff;border:2px solid var(--line);border-radius:12px;padding:22px 14px;text-align:center;transition:.25s}
.cert:hover{border-color:var(--teal);transform:translateY(-4px);box-shadow:0 10px 26px rgba(8,145,178,.16)}
.cert .ico{font-size:1.7rem;margin-bottom:9px}
.cert b{display:block;font-size:.9rem;color:var(--navy)}
.cert span{font-size:.76rem;color:var(--muted)}

/* band CTA */
.band{background:linear-gradient(135deg,var(--teal),var(--cyan));color:#fff;text-align:center;border-radius:18px;padding:56px 26px;margin:0 22px}
.band h2{font-size:2rem;font-weight:800;margin-bottom:13px}
.band p{opacity:.94;margin-bottom:26px;max-width:620px;margin-left:auto;margin-right:auto}
.band .btn{background:#fff;color:var(--navy)}
.band .btn:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(0,0,0,.2)}

/* footer */
footer{background:var(--navy);color:#94a3b8;padding:52px 22px 26px;margin-top:72px}
.foot-in{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:34px}
footer h4{color:#fff;font-size:.94rem;margin-bottom:15px;font-weight:700}
footer a,footer p{font-size:.87rem;line-height:2}
footer a:hover{color:var(--cyan)}
.foot-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:38px;padding-top:20px;text-align:center;font-size:.81rem}

/* whatsapp float */
.whatsapp-float{position:fixed;bottom:24px;right:24px;z-index:999;width:58px;height:58px;background:var(--green);border-radius:50%;
  display:flex;align-items:center;justify-content:center;box-shadow:0 4px 18px rgba(37,211,102,.45);transition:.3s;animation:wa 2s infinite}
.whatsapp-float:hover{transform:scale(1.1);animation:none}
.whatsapp-float svg{width:30px;height:30px;fill:#fff}
@keyframes wa{0%{box-shadow:0 0 0 0 rgba(37,211,102,.5)}70%{box-shadow:0 0 0 14px rgba(37,211,102,0)}100%{box-shadow:0 0 0 0 rgba(37,211,102,0)}}

/* page hero (subpages) */
.phero{background:linear-gradient(135deg,#0A2540,#0d2f52 60%,#0891B2 140%);color:#fff;padding:58px 22px 52px}
.phero-in{max-width:1200px;margin:0 auto}
.phero h1{font-size:2.3rem;font-weight:800;margin-bottom:12px}
.phero p{color:#cbd5e1;max-width:680px}
.crumb{font-size:.83rem;color:#7dd3fc;margin-bottom:14px}

/* spec table */
.spec-table{width:100%;border-collapse:collapse;background:#fff;border-radius:12px;overflow:hidden;
  box-shadow:0 2px 14px rgba(10,37,64,.07);margin:26px 0;font-size:.9rem}
.spec-table th{background:var(--navy);color:#fff;padding:13px 15px;text-align:left;font-weight:600;font-size:.87rem}
.spec-table td{padding:11px 15px;border-bottom:1px solid var(--line)}
.spec-table tr:nth-child(even) td{background:#f8fafc}
.spec-table td:first-child{font-weight:600;color:var(--navy);width:34%}

/* gallery */
.gal{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:15px}
.gal img{border-radius:11px;border:1px solid var(--line);background:#fff;padding:9px;transition:.25s;cursor:pointer}
.gal img:hover{transform:scale(1.035);box-shadow:0 10px 26px rgba(10,37,64,.13)}

/* lightbox */
.lb{display:none;position:fixed;inset:0;background:rgba(10,37,64,.93);z-index:1000;align-items:center;justify-content:center;padding:26px}
.lb.on{display:flex}
.lb img{max-width:92%;max-height:88%;border-radius:11px}
.lb .close{position:absolute;top:22px;right:30px;color:#fff;font-size:2.2rem;cursor:pointer;line-height:1}

/* back to top */
.btt{position:fixed;bottom:24px;left:24px;width:44px;height:44px;border-radius:50%;background:var(--navy);color:#fff;
  border:none;cursor:pointer;font-size:1.15rem;display:none;z-index:998;box-shadow:0 4px 14px rgba(0,0,0,.25)}
.btt.on{display:block}

/* form */
.form{background:#fff;border:1px solid var(--line);border-radius:14px;padding:30px;max-width:620px}
.form label{display:block;font-size:.87rem;font-weight:600;color:var(--navy);margin-bottom:6px}
.form input,.form textarea,.form select{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:9px;
  font-size:.94rem;margin-bottom:17px;font-family:inherit;background:#fbfdff}
.form input:focus,.form textarea:focus{outline:none;border-color:var(--teal);box-shadow:0 0 0 3px rgba(8,145,178,.12)}

/* reveal */
.rv{opacity:0;transform:translateY(22px);transition:.7s cubic-bezier(.2,.7,.3,1)}
.rv.in{opacity:1;transform:none}

@media(max-width:900px){
  .hero-in,.local-grid{grid-template-columns:1fr;gap:34px}
  .hero h1{font-size:2.05rem}
  .trust-in{grid-template-columns:repeat(2,1fr)}
  .foot-in{grid-template-columns:1fr 1fr}
  .nav-links{display:none;position:absolute;top:68px;left:0;right:0;background:var(--navy);flex-direction:column;
    padding:18px 22px;gap:4px;border-top:1px solid rgba(255,255,255,.1)}
  .nav-links.open{display:flex}
  .burger{display:block;margin-left:auto}
  .lang-btn{margin-left:0}
  section{padding:52px 18px}
  .sec-head h2{font-size:1.6rem}
}