:root{
  --bg:#f6f7fb; --panel:#fff; --ink:#0f172a; --muted:#5b6478;
  --line:#e6e8f0; --accent:#2563eb; --accent-soft:#eaf1ff; --radius:16px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);
  font:16px/1.7 system-ui,-apple-system,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;
  -webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{width:min(1120px,92vw);margin-inline:auto}
header{position:sticky;top:0;z-index:20;backdrop-filter:blur(10px);
  background:rgba(246,247,251,.85);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:18px;
  min-height:64px;padding:10px 0;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:.2px}
.brand .mark{width:28px;height:28px;border-radius:9px;
  background:linear-gradient(135deg,#2563eb,#60a5fa)}
.nav ul{display:flex;flex-wrap:wrap;gap:22px;list-style:none;margin:0;padding:0;
  color:var(--muted);font-size:15px}
.nav ul a:hover{color:var(--ink)}
.nav ul a.active{color:var(--ink);font-weight:600}
.nav .cta{padding:9px 18px;border-radius:999px;background:var(--ink);color:#fff;font-size:14px}

.hero{padding:clamp(48px,8vw,96px) 0 clamp(40px,6vw,72px)}
.tagline{display:inline-block;padding:6px 14px;border-radius:999px;background:var(--accent-soft);
  color:var(--accent);font-size:13px;font-weight:600;letter-spacing:.3px}
.hero h1{margin:20px 0 0;font-size:clamp(30px,4.4vw,52px);line-height:1.18;letter-spacing:-.5px;max-width:16em}
.hero p{margin:18px 0 0;max-width:640px;color:var(--muted);font-size:clamp(15px,1.6vw,18px)}
.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.btn{padding:13px 26px;border-radius:999px;font-size:15px;font-weight:600;
  transition:transform .15s ease,box-shadow .15s ease}
.btn.primary{background:var(--accent);color:#fff;box-shadow:0 8px 20px rgba(37,99,235,.22)}
.btn.primary:hover{transform:translateY(-1px);box-shadow:0 12px 26px rgba(37,99,235,.28)}
.btn.ghost{border:1px solid var(--line);background:var(--panel);color:var(--ink)}
.btn.ghost:hover{border-color:#cfd6e6}

section{padding:clamp(40px,6vw,72px) 0}
.sec-head{max-width:660px}
.sec-head h2{margin:0;font-size:clamp(22px,2.6vw,32px);letter-spacing:-.3px}
.sec-head p{margin:12px 0 0;color:var(--muted)}
.grid{display:grid;gap:18px;margin-top:34px}
@media(min-width:760px){.grid.c3{grid-template-columns:repeat(3,1fr)}.grid.c4{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1040px){.grid.c4{grid-template-columns:repeat(4,1fr)}}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.card h2,.card h3{margin:0 0 8px;font-size:17px}
.card p{margin:0;color:var(--muted);font-size:15px}
.card .num{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;
  border-radius:10px;background:var(--accent-soft);color:var(--accent);font-weight:700;
  font-size:14px;margin-bottom:16px}

.flow{list-style:none;margin:34px 0 0;padding:0;display:grid;gap:12px}
.flow li{position:relative;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px 20px}
.flow .step{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:9px;background:var(--accent-soft);color:var(--accent);font-weight:700;font-size:13px;margin-bottom:10px}
.flow h3{margin:0 0 6px;font-size:16px}
.flow p{margin:0;color:var(--muted);font-size:14px}
@media(min-width:900px){
  .flow{grid-template-columns:repeat(5,1fr);gap:14px}
  .flow h3{min-height:3.3em}
  .flow li:not(:last-child)::after{content:"";position:absolute;top:50%;right:-11px;width:9px;height:9px;
    border-top:2px solid #c3cede;border-right:2px solid #c3cede;transform:translateY(-50%) rotate(45deg)}
}
.flow-note{margin:22px 0 0;color:var(--muted);font-size:14px}

.page-head{padding:clamp(40px,6vw,72px) 0 0}
.page-head h1{margin:0;font-size:clamp(26px,3.4vw,40px);letter-spacing:-.5px}
.page-head p{margin:14px 0 0;max-width:640px;color:var(--muted)}
.prose{max-width:760px;margin-top:26px}
.prose p{margin:0 0 16px;color:var(--muted);font-size:17px}

.product-grid{display:grid;gap:22px;margin-top:34px;grid-template-columns:1fr}
@media(min-width:680px){.product-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1000px){.product-grid{grid-template-columns:repeat(3,1fr)}}
.product-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;display:flex;flex-direction:column;transition:transform .15s ease,box-shadow .15s ease}
.product-card:hover{transform:translateY(-2px);box-shadow:0 14px 30px rgba(15,23,42,.08)}
.product-card img{width:100%;aspect-ratio:4/3;object-fit:cover}
.product-card .body{padding:20px 22px 24px;display:flex;flex-direction:column;gap:8px;flex:1}
.product-card h3{margin:0;font-size:17px}
.product-card .cat{margin:0;color:var(--accent);font-size:12px;font-weight:700;
  letter-spacing:.6px;text-transform:uppercase}
.product-card p.desc{margin:0;color:var(--muted);font-size:14px;flex:1}
.product-card .foot{display:flex;align-items:center;justify-content:space-between;margin-top:10px}
.product-card .price{font-size:14px;font-weight:600}
.product-card .more{font-size:14px;font-weight:600;color:var(--accent)}

.detail{display:grid;gap:32px;margin-top:30px}
@media(min-width:860px){.detail{grid-template-columns:1fr 1fr;align-items:start}}
.detail img{border-radius:var(--radius);border:1px solid var(--line);width:100%}
.detail h1{margin:0 0 6px;font-size:clamp(24px,3vw,34px);letter-spacing:-.4px}
.detail .cat{margin:0 0 16px;color:var(--accent);font-size:12px;font-weight:700;
  letter-spacing:.6px;text-transform:uppercase}
.detail p.desc{margin:0 0 22px;color:var(--muted);font-size:17px}
.detail .price{margin:0 0 26px;font-size:15px}
.detail .price b{font-size:18px}

.stats{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:34px;max-width:620px}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.stat b{display:block;font-size:26px;letter-spacing:-.5px}
.stat span{color:var(--muted);font-size:14px}

.cta-band{margin-top:26px;background:var(--ink);color:#fff;border-radius:22px;
  padding:clamp(28px,4vw,44px);display:flex;flex-wrap:wrap;gap:16px;
  align-items:center;justify-content:space-between}
.cta-band h2{margin:0;font-size:clamp(20px,2.4vw,26px)}
.cta-band p{margin:8px 0 0;color:#b9c2d6;font-size:15px}
.cta-band .btn{background:#fff;color:var(--ink)}

.contact-list{display:grid;gap:14px;margin-top:26px;max-width:520px}
.contact-row{display:flex;gap:14px;background:var(--panel);border:1px solid var(--line);
  border-radius:14px;padding:16px 20px;align-items:baseline}
.contact-row span{color:var(--muted);font-size:14px;min-width:130px}
.contact-row b{font-size:15px}

footer{border-top:1px solid var(--line);padding:28px 0;margin-top:clamp(40px,6vw,72px);
  color:var(--muted);font-size:14px}
.foot{display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;align-items:center}

/* Factory gallery (real production-line photos) */
.factory-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px;margin-top:22px}
.factory-grid figure{margin:0;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:10px}
.factory-grid img{width:100%;height:150px;object-fit:cover;border-radius:calc(var(--radius) - 4px);display:block}
.factory-grid figcaption{font-size:13px;color:var(--muted);text-align:center;padding-top:10px}
.muted{color:var(--muted)}

/* === v4: product detail sections (2026-11-14) === */
/* Product detail sections */
.dmain{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:start}
.psec{margin-top:34px;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.psec h3{margin:0 0 14px;font-size:17px}
.pspec{width:100%;border-collapse:collapse}
.pspec td{padding:9px 6px;border-bottom:1px solid var(--line);font-size:14px;vertical-align:top}
.pspec td:first-child{color:var(--muted);width:38%;font-weight:600}
.pproc{margin:0;padding-left:20px}
.pproc li{margin-bottom:8px;font-size:14px;color:var(--muted)}
.pfaq details{margin-bottom:10px;border:1px solid var(--line);border-radius:10px;padding:10px 14px}
.pfaq summary{cursor:pointer;font-weight:600;font-size:14px}
.pfaq p{margin:8px 0 0;font-size:14px;color:var(--muted)}