:root{
  --ink:#0f1b2d;
  --ink-2:#16263d;
  --gold:#c9a24b;
  --gold-soft:#e7c97f;
  --paper:#ffffff;
  --bg:#f6f7f9;
  --muted:#6b7686;
  --line:#e4e8ee;
  --maxw:1180px;
  --radius:14px;
  --shadow:0 10px 30px rgba(15,27,45,.08);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);
  background:var(--paper);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}
.zh,.en{transition:opacity .2s}
body[data-lang="zh"] .en{display:none}
body[data-lang="en"] .zh{display:none}

/* ---------- Header ---------- */
header{
  position:sticky;top:0;z-index:50;
  background:rgba(15,27,45,.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;letter-spacing:.5px}
.brand .dot{width:10px;height:10px;border-radius:50%;background:var(--gold);box-shadow:0 0 12px var(--gold)}
.brand b{font-size:18px}
.nav-links{display:flex;gap:26px;align-items:center}
.nav-links a{color:#cdd5e0;font-size:14px;font-weight:500;position:relative;padding:4px 0}
.nav-links a:hover{color:#fff}
.nav-links a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;background:var(--gold);transition:width .25s}
.nav-links a:hover::after{width:100%}
.lang-btn{
  border:1px solid var(--gold);color:var(--gold);
  background:transparent;border-radius:999px;
  padding:6px 14px;font-size:13px;font-weight:600;cursor:pointer;white-space:nowrap;
}
.lang-btn:hover{background:var(--gold);color:#0f1b2d}
.menu-btn{display:none;background:none;border:0;color:#fff;font-size:24px;cursor:pointer}

/* ---------- Hero ---------- */
.hero{
  position:relative;min-height:78vh;display:flex;align-items:center;
  background:url("img/Luxurious_macro_photograph_of__2026-07-27T06-11-11.png") center/cover no-repeat;
  color:#fff;
}
.hero::before{content:"";position:absolute;inset:0;background:linear-gradient(120deg,rgba(10,18,30,.86),rgba(10,18,30,.45) 60%,rgba(10,18,30,.7))}
.hero .wrap{position:relative;z-index:2;padding:60px 22px}
.hero .tag{display:inline-block;border:1px solid var(--gold);color:var(--gold-soft);padding:5px 14px;border-radius:999px;font-size:13px;letter-spacing:1px;margin-bottom:20px}
.hero h1{font-size:clamp(28px,4.4vw,52px);line-height:1.18;font-weight:700;margin-bottom:18px;max-width:780px}
.hero h1 .accent{color:var(--gold-soft)}
.hero p.lead{font-size:clamp(15px,1.8vw,19px);color:#d7dde6;max-width:640px;margin-bottom:30px}
.hero .cta{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-block;padding:13px 26px;border-radius:999px;font-weight:600;font-size:15px;cursor:pointer;border:1px solid transparent;transition:transform .15s,box-shadow .2s}
.btn-gold{background:var(--gold);color:#0f1b2d}
.btn-gold:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(201,162,75,.4)}
.btn-ghost{border-color:rgba(255,255,255,.5);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12)}

/* ---------- Sections ---------- */
section{padding:78px 0}
.section-head{text-align:center;max-width:720px;margin:0 auto 46px}
.section-head .eyebrow{color:var(--gold);font-weight:600;letter-spacing:2px;font-size:13px;text-transform:uppercase}
.section-head h2{font-size:clamp(24px,3vw,34px);margin:10px 0 12px;font-weight:700}
.section-head p{color:var(--muted);font-size:15px}
.bg-soft{background:var(--bg)}

/* About */
.about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.about-grid p{color:#45506a;margin-bottom:16px;font-size:16px}
.stats{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.stat{background:var(--ink);color:#fff;border-radius:var(--radius);padding:22px;text-align:center}
.stat b{display:block;font-size:30px;color:var(--gold-soft);font-weight:700}
.stat span{font-size:13px;color:#cdd5e0}

/* Products */
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.cards.mat{grid-template-columns:repeat(3,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);transition:transform .18s,border-color .18s}
.card:hover{transform:translateY(-4px);border-color:var(--gold)}
.card .ico{width:42px;height:42px;border-radius:10px;background:rgba(201,162,75,.12);color:var(--gold);display:flex;align-items:center;justify-content:center;font-weight:700;margin-bottom:14px}
.card h3{font-size:18px;margin-bottom:8px}
.card p{color:var(--muted);font-size:14px}

/* OEM steps */
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;position:relative}
.step .num{width:34px;height:34px;border-radius:50%;background:var(--ink);color:var(--gold-soft);display:flex;align-items:center;justify-content:center;font-weight:700;margin-bottom:12px}
.step h4{font-size:16px;margin-bottom:6px}
.step p{color:var(--muted);font-size:13px}

/* Quality */
.quality-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.q{background:var(--ink);color:#fff;border-radius:var(--radius);padding:26px}
.q .ico{font-size:22px;margin-bottom:10px}
.q h4{font-size:16px;margin-bottom:8px;color:var(--gold-soft)}
.q p{font-size:13px;color:#cdd5e0}

/* Process */
.proc{display:grid;grid-template-columns:repeat(6,1fr);gap:12px}
.pc{text-align:center;padding:18px 10px;border:1px dashed var(--line);border-radius:var(--radius);background:#fff}
.pc .n{color:var(--gold);font-weight:700;font-size:14px}
.pc b{display:block;margin:8px 0 6px;font-size:15px}
.pc span{font-size:12px;color:var(--muted)}

/* Applications + Gallery */
.app-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.app{position:relative;border-radius:var(--radius);overflow:hidden;height:200px;display:flex;align-items:flex-end}
.app img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.app::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 40%,rgba(10,18,30,.8))}
.app span{position:relative;z-index:2;color:#fff;padding:16px;font-weight:600}
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.gallery figure{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);background:#fff}
.gallery img{width:100%;height:280px;object-fit:cover}
.gallery figcaption{padding:12px 16px;font-size:13px;color:var(--muted)}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.contact-info p{color:#45506a;margin-bottom:14px;font-size:15px}
.contact-info .row{display:flex;gap:10px;align-items:center;margin-bottom:12px;color:#45506a;font-size:15px}
.contact-info .row b{color:var(--ink)}
.form input,.form textarea{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:10px;margin-bottom:14px;font:inherit;font-size:14px;background:#fff}
.form textarea{resize:vertical;min-height:110px}
.note{font-size:12px;color:var(--muted);margin-top:6px}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.form-status{font-size:13px;margin-top:4px;min-height:18px;line-height:1.5}
.form-status.err{color:#a32d2d}
.form-status.ok{color:#3b6d11}
.form-status:empty{margin:0}
.btn[disabled]{opacity:.6;cursor:not-allowed}

/* Footer */
footer{background:var(--ink);color:#aab4c2;padding:42px 0 26px}
.foot-grid{display:flex;justify-content:space-between;flex-wrap:wrap;gap:24px;margin-bottom:22px}
footer b{color:#fff}
footer .small{font-size:13px}
footer .copy{border-top:1px solid rgba(255,255,255,.1);padding-top:18px;font-size:13px;color:#7e8a9c}
.beian{text-align:center;font-size:12px;color:#7e8a9c;margin:0 0 10px}
.beian a{color:#9fb0c4;text-decoration:underline}
.beian a:hover{color:#fff}

/* Products expanded */
.products-note{max-width:820px;margin:30px auto 0;font-size:13px;color:var(--muted);text-align:center;line-height:1.7}
.card .grade{display:inline-block;font-size:11px;font-weight:600;padding:2px 9px;border-radius:999px;background:rgba(201,162,75,.16);color:#9a7a2c;margin-left:6px;vertical-align:middle;letter-spacing:.3px}
.card.flag-top{border-color:var(--gold);box-shadow:0 12px 34px rgba(201,162,75,.20)}
.card .meta{margin-top:14px;display:flex;flex-wrap:wrap;gap:6px}
.card .meta span{font-size:12px;color:var(--ink-2);background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:3px 9px;white-space:nowrap}
.sub{font-size:20px;font-weight:700;margin:48px 0 22px;text-align:center}
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
.cmp{width:100%;border-collapse:collapse;background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);font-size:14px;min-width:620px}
.cmp th,.cmp td{padding:13px 14px;text-align:left;border-bottom:1px solid var(--line);white-space:nowrap}
.cmp thead th{background:var(--ink);color:#fff;font-weight:600;font-size:13px}
.cmp tbody tr:last-child td{border-bottom:0}
.cmp tbody tr:nth-child(even){background:#fafbfc}
.cmp .tier{display:inline-block;font-size:11px;font-weight:600;padding:3px 10px;border-radius:999px}
.tier-top{background:var(--gold);color:#0f1b2d}
.tier-high{background:rgba(201,162,75,.22);color:#9a7a2c}
.tier-mid{background:#e3ecf7;color:#2a5a9e}
.tier-val{background:#e8f3e8;color:#3b6d11}
.tier-basic{background:#eee;color:#777}
.forms .card .ico{background:rgba(15,27,45,.06);color:var(--ink-2)}

/* Responsive */
@media(max-width:980px){
  .about-grid{grid-template-columns:1fr}
  .cards,.cards.mat{grid-template-columns:repeat(2,1fr)}
  .quality-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .proc{grid-template-columns:repeat(3,1fr)}
  .contact-grid{grid-template-columns:1fr}
  .gallery{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:680px){
  .menu-btn{display:block}
  .nav-links{display:none;position:absolute;top:64px;left:0;right:0;background:var(--ink);flex-direction:column;padding:16px 22px;gap:14px;border-bottom:1px solid rgba(255,255,255,.1)}
  .nav-links.open{display:flex}
  .cards,.cards.mat,.quality-grid,.steps,.proc,.app-grid,.gallery{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
}