:root{
  --teal:#2DA8A8;
  --teal-d:#1f8080;
  --teal-l:#3BC9C9;
  --bg:#ffffff;
  --bg-soft:#f5f8f8;
  --ink:#1a2332;
  --muted:#5a6776;
  --line:#e3ebea;
  --amber:#f5a623;
  --shadow:0 4px 20px rgba(45,168,168,.10);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink);line-height:1.65;font-size:15px;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.wrap{max-width:1200px;margin:0 auto;padding:0 28px}

/* ============ HEADER ============ */
.nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;justify-content:space-between;padding:11px 28px;max-width:1200px;margin:0 auto;gap:24px}
.brand img{height:64px;display:block;transition:transform .25s}
.brand:hover img{transform:scale(1.04)}
.brand-sub{font-size:11.5px;color:var(--muted);letter-spacing:.2em;text-transform:uppercase;margin-top:5px;font-weight:600}
.nav-links{display:flex;align-items:center;gap:30px}
.nav-links a{font-size:14px;color:var(--ink);transition:.2s;position:relative;padding:8px 0}
.nav-links a:hover{color:var(--teal)}
.nav-links a::after{content:"";position:absolute;bottom:0;left:50%;width:0;height:2px;background:var(--teal);transition:.25s;transform:translateX(-50%)}
.nav-links a:hover::after{width:100%}
.btn-quote{background:var(--teal);color:#fff!important;padding:10px 22px;border-radius:8px;font-weight:600;font-size:14px;transition:.2s}
.btn-quote:hover{background:var(--teal-d);box-shadow:var(--shadow)}

/* ============ HERO（大幅海报版） ============ */
.hero{position:relative;background:#0a1a1b;padding:96px 0 84px;overflow:hidden}
.hero-bg{position:absolute;inset:0;background:url(/assets/opt/hero-bg-sm.webp) center/cover no-repeat}
.hero-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(7,20,20,.95) 0%,rgba(7,20,20,.84) 42%,rgba(7,20,20,.42) 76%,rgba(7,20,20,.32) 100%)}
.hero .wrap{position:relative;z-index:2}
.hero-grid{display:grid;grid-template-columns:1fr;max-width:860px}
.hero-eyebrow{display:inline-flex;align-items:center;gap:8px;background:rgba(59,201,201,.16);color:var(--teal-l);border:1px solid rgba(59,201,201,.3);padding:6px 14px;border-radius:30px;font-size:12px;font-weight:600;letter-spacing:.12em;margin-bottom:20px}
.hero h1{font-size:46px;font-weight:800;line-height:1.15;letter-spacing:-.01em;margin-bottom:18px;color:#fff}
.hero h1 span{color:var(--teal-l)}
.hero-sub{font-size:17px;color:rgba(255,255,255,.84);margin-bottom:32px;max-width:520px}
.hero-stats{display:flex;gap:36px;flex-wrap:wrap;margin-bottom:32px}
.hero-stats .item .v{font-size:30px;font-weight:800;color:#fff;line-height:1}
.hero-stats .item .k{font-size:12px;color:rgba(255,255,255,.62);margin-top:4px;letter-spacing:.06em}
.hero-ctas{display:flex;gap:14px;flex-wrap:wrap}
.btn-primary{background:var(--teal);color:#fff;padding:14px 32px;border-radius:10px;font-weight:700;font-size:15px;display:inline-flex;align-items:center;gap:8px;transition:.2s;border:none;cursor:pointer}
.btn-primary:hover{background:var(--teal-l);box-shadow:0 6px 24px rgba(59,201,201,.35);transform:translateY(-2px)}
.btn-secondary{border:2px solid rgba(255,255,255,.75);color:#fff;padding:12px 28px;border-radius:10px;font-weight:600;font-size:15px;display:inline-flex;align-items:center;gap:8px;transition:.2s;background:transparent}
.btn-secondary:hover{background:#fff;color:var(--ink)}


/* ============ TRUST STRIP ============ */
.trust-strip{background:var(--ink);padding:24px 0}
.trust-grid{display:flex;justify-content:space-around;flex-wrap:wrap;gap:24px;color:#fff;text-align:center}
.trust-item{display:flex;align-items:center;gap:10px;font-size:13px}
.trust-item .badge{width:36px;height:36px;border-radius:50%;background:var(--teal);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:13px;flex-shrink:0}
.trust-item .v{font-size:18px;font-weight:700;line-height:1.1}
.trust-item .k{font-size:11px;color:#aab7c5;letter-spacing:.06em}

/* ============ SECTION COMMON ============ */
.section{padding:80px 0}
.sec-head{text-align:center;margin-bottom:50px}
.sec-head .eyebrow{color:var(--teal);font-size:13px;font-weight:700;letter-spacing:.2em;text-transform:uppercase;margin-bottom:10px}
.sec-head h2{font-size:36px;font-weight:800;letter-spacing:-.01em;margin-bottom:12px}
.sec-head .desc{color:var(--muted);font-size:16px;max-width:620px;margin:0 auto}

/* ============ TOP PICKS ============ */
.picks-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:28px}
.pick{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;transition:.3s;display:flex;flex-direction:column;position:relative}
.pick:hover{transform:translateY(-4px);box-shadow:0 18px 40px rgba(45,168,168,.15);border-color:var(--teal)}
.pick .visual{height:240px;position:relative;overflow:hidden;background:#0d2b2b}
.pick .visual img{width:100%;height:100%;object-fit:cover;object-position:center;display:block;transition:transform .55s ease}
.pick:hover .visual img{transform:scale(1.06)}
.pick .visual .ov{position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,26,27,0) 35%,rgba(10,26,27,.78) 100%);z-index:1}
.pick .visual .code{position:absolute;left:20px;bottom:14px;color:#fff;font-size:24px;font-weight:800;letter-spacing:.02em;z-index:2;text-shadow:0 2px 10px rgba(0,0,0,.45)}
.pick .visual::after{content:"";position:absolute;inset:0;background:radial-gradient(circle at 80% 20%,rgba(45,168,168,.1) 0%,transparent 60%)}
.pick .badge-flag{position:absolute;top:18px;left:18px;background:var(--teal);color:#fff;font-size:11px;font-weight:700;padding:6px 14px;border-radius:20px;letter-spacing:.06em;z-index:2}
.pick .badge-flag.gold{background:var(--amber);color:#fff}
.pick .body{padding:28px 30px 32px;flex:1;display:flex;flex-direction:column}
.pick h3{font-size:24px;font-weight:800;margin-bottom:4px}
.pick .cat{font-size:12px;color:var(--muted);letter-spacing:.16em;text-transform:uppercase;margin-bottom:14px}
.pick .desc{font-size:14px;color:var(--muted);margin-bottom:18px;line-height:1.6}
.pick ul{list-style:none;margin-bottom:20px}
.pick li{font-size:14px;padding:9px 0;border-bottom:1px dashed var(--line);display:flex;gap:10px;align-items:flex-start}
.pick li:last-child{border-bottom:none}
.pick li::before{content:"✓";color:var(--teal);font-weight:700;font-size:16px;flex-shrink:0;line-height:1.4}
.pick li b{color:var(--ink);font-weight:700;margin-right:6px}
.pick .tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:auto}
.pick .tag-sm{font-size:11px;padding:4px 10px;background:rgba(45,168,168,.08);color:var(--teal);border-radius:12px;font-weight:600}
.pick .foot{padding:0 30px 28px;display:flex;gap:10px}
.pick .foot a{flex:1;text-align:center;padding:11px 0;border-radius:8px;font-weight:600;font-size:14px;transition:.2s}
.pick .foot .inq{background:var(--teal);color:#fff}
.pick .foot .inq:hover{background:var(--teal-d)}
.pick .foot .det{border:1px solid var(--line);color:var(--ink)}
.pick .foot .det:hover{border-color:var(--teal);color:var(--teal)}

/* ============ SPECS ============ */
.specs-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-bottom:50px}
.spec{background:#fff;border:1px solid var(--line);border-radius:12px;padding:24px 18px;text-align:center;transition:.25s}
.spec:hover{border-color:var(--teal);transform:translateY(-2px);box-shadow:var(--shadow)}
.spec .v{font-size:30px;font-weight:800;color:var(--teal);line-height:1}
.spec .k{font-size:13px;color:var(--muted);margin-top:8px}

/* ============ CERTS ============ */
.certs{display:flex;flex-wrap:wrap;gap:14px;justify-content:center}
.cert{display:flex;align-items:center;gap:10px;padding:10px 18px;background:#fff;border:1px solid var(--line);border-radius:30px;font-size:13px;color:var(--ink);transition:.2s}
.cert:hover{border-color:var(--teal)}
.cert .ic{width:28px;height:28px;border-radius:50%;background:var(--teal);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:11px;flex-shrink:0}
.cert b{color:var(--teal);font-weight:700}

/* ============ B2B / OEM ============ */
.b2b-section{background:var(--bg-soft);padding:80px 0}
.b2b-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.b2b-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:32px 24px;text-align:center;transition:.25s;position:relative}
.b2b-card:hover{transform:translateY(-4px);border-color:var(--teal);box-shadow:var(--shadow)}
.b2b-card .ic{width:56px;height:56px;border-radius:14px;background:rgba(45,168,168,.10);color:var(--teal);display:flex;align-items:center;justify-content:center;font-size:26px;margin:0 auto 18px}
.b2b-card h4{font-size:17px;font-weight:700;margin-bottom:10px}
.b2b-card p{font-size:13px;color:var(--muted);line-height:1.65}
.b2b-card.featured{background:var(--teal);color:#fff;border:none}
.b2b-card.featured .ic{background:rgba(255,255,255,.16);color:#fff}
.b2b-card.featured p{color:rgba(255,255,255,.85)}
.b2b-card.featured::after{content:"★ Most Asked";position:absolute;top:-10px;right:18px;background:var(--amber);color:#fff;font-size:11px;font-weight:700;padding:4px 12px;border-radius:20px;letter-spacing:.06em}

/* ============ FAQ ============ */
.faq-section{padding:80px 0;background:var(--bg-soft);border-bottom:1px solid var(--line)}
.faq-section h2{font-size:36px;font-weight:800;text-align:center;margin-bottom:14px}
.faq-list{max-width:760px;margin:36px auto 0}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px 24px;margin-bottom:14px;box-shadow:var(--shadow)}
.faq-item .q{font-weight:700;font-size:16px;color:var(--ink);margin-bottom:6px;display:flex;gap:10px;align-items:flex-start}
.faq-item .q::before{content:"Q";flex:0 0 auto;width:26px;height:26px;border-radius:8px;background:var(--teal);color:#fff;font-size:13px;font-weight:700;display:inline-flex;align-items:center;justify-content:center;margin-top:2px}
.faq-item .a{font-size:14px;color:var(--muted);padding-left:36px}

/* ============ CONTACT ============ */
.contact-section{background:var(--ink);color:#fff;padding:80px 0}
.contact-section h2{color:#fff;font-size:36px;font-weight:800;text-align:center;margin-bottom:14px}
.contact-section .sec-head h2,
.contact-section .sec-head .desc{color:#fff}
.contact-section .sec-head .desc{color:#aab7c5}
.contact-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;max-width:880px;margin:0 auto}
.ccard{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:16px;padding:30px 28px;text-align:center;transition:.25s}
.ccard:hover{background:rgba(255,255,255,.10);border-color:var(--teal-l);transform:translateY(-2px)}
.ccard .ic{width:52px;height:52px;border-radius:50%;background:var(--teal);display:flex;align-items:center;justify-content:center;font-size:22px;margin:0 auto 16px}
.ccard .lbl{font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:#aab7c5;margin-bottom:8px}
.ccard .val{font-size:17px;font-weight:700;color:#fff;word-break:break-all;line-height:1.4}
.ccard .val a{color:#fff}
.ccard .val a:hover{color:var(--teal-l)}
.ccard .note{font-size:11.5px;color:#7a8898;margin-top:8px}
.ccard.fb .val{color:#7a8898;font-style:italic}

/* ============ FOOTER ============ */
footer{background:#0e1822;color:#aab7c5;padding:50px 0 30px;font-size:13px}
.f-top{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:36px;margin-bottom:32px}
.f-brand img{height:42px;margin-bottom:14px}
.f-brand p{font-size:12.5px;line-height:1.7;color:#7a8898;max-width:300px}
.f-col h5{color:#fff;font-size:14px;font-weight:700;margin-bottom:14px;letter-spacing:.04em}
.f-col ul{list-style:none}
.f-col li{margin-bottom:8px}
.f-col a{color:#aab7c5;font-size:13px;transition:.2s}
.f-col a:hover{color:var(--teal-l)}
.f-bottom{border-top:1px solid rgba(255,255,255,.06);padding-top:24px;text-align:center;font-size:12px;color:#5a6776}
.f-bottom .f-legal{display:inline-flex;gap:12px;flex-wrap:wrap;justify-content:center;margin-left:14px}
.f-bottom .f-legal a{color:#7a8898;transition:.2s}
.f-bottom .f-legal a:hover{color:#3BC9C9}
.f-bottom .f-legal i{color:#3a4754;font-style:normal}
@media(max-width:960px){.f-bottom .f-legal{display:flex;margin:10px 0 0}}
.f-logos{display:flex;gap:14px;align-items:center;margin-bottom:18px}
.f-logos img{height:32px;opacity:.75;transition:.2s}
.f-logos img:hover{opacity:1}
.f-logos .sep{color:#3a4754;font-size:12px}

/* ============ SOLUTIONS CONCEPT（阶梯漏斗层级） ============ */
.solutions-sec{background:var(--bg-soft)}
.concept-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:stretch}
.cf-row{position:relative}
.cf-row+.cf-row{margin-top:16px}
.lv1{padding-right:0}
.lv2{padding-left:9%}
.lv3{padding-left:18%}
/* 阶梯连接线（L 形虚线） */
.cf-row.lv2::before,.cf-row.lv3::before{content:"";position:absolute;top:-16px;left:4.5%;width:16px;height:16px;border-left:2px dashed var(--teal);border-bottom:2px dashed var(--teal)}
.cf-row.lv3::before{left:13.5%}
.cf-card{border-radius:16px;padding:24px 28px 22px;transition:transform .25s,box-shadow .25s}
.cf-card:hover{transform:translateY(-3px)}
.lv1 .cf-card{background:linear-gradient(135deg,#0d2b2b 0%,#17605f 100%);color:#fff;box-shadow:0 10px 30px rgba(23,96,95,.35)}
.lv1 .cf-kicker{color:var(--teal-l)}
.lv1 h3{color:#fff}
.lv1 p{color:rgba(255,255,255,.82)}
.lv1 .cf-link{color:var(--teal-l)}
.cf-kicker{font-size:10.5px;letter-spacing:.2em;font-weight:800;text-transform:uppercase;color:var(--teal);margin-bottom:6px}
.cf-card h3{font-size:21px;font-weight:800;margin-bottom:6px}
.cf-card p{font-size:13.5px;color:var(--muted);margin-bottom:12px;max-width:520px}
.cf-link{display:inline-block;font-size:13px;font-weight:700;color:var(--teal);transition:.2s}
.cf-link:hover{transform:translateX(3px)}
.lv2 .cf-card{background:#fff;border:1px solid var(--line);border-left:4px solid var(--teal);box-shadow:var(--shadow)}
.cf-chips{display:flex;gap:12px;flex-wrap:wrap}
.cf-chip{display:inline-flex;align-items:center;gap:8px;background:#fff;border:2px solid var(--teal);border-radius:30px;padding:10px 18px;font-size:13px;font-weight:700;color:var(--ink);transition:.2s;box-shadow:0 3px 12px rgba(45,168,168,.12)}
.cf-chip:hover{background:var(--teal);color:#fff;transform:translateY(-2px)}
.cf-chip small{font-weight:500;opacity:.75}
.concept-visual{position:relative;border-radius:16px;overflow:hidden;min-height:380px;box-shadow:0 8px 28px rgba(26,35,50,.18)}
.concept-visual img{width:100%;height:100%;object-fit:cover;display:block}
.cv-badge{position:absolute;left:16px;bottom:16px;background:rgba(10,26,27,.78);color:#fff;font-size:12.5px;font-weight:600;letter-spacing:.04em;padding:8px 14px;border-radius:10px;backdrop-filter:blur(6px)}

@media(max-width:960px){
  .concept-grid{grid-template-columns:1fr}
  .lv2{padding-left:5%}
  .lv3{padding-left:10%}
  .cf-row.lv2::before{left:2.5%}
  .cf-row.lv3::before{left:7.5%}
  .hero-grid,.picks-grid,.b2b-grid,.contact-cards{grid-template-columns:1fr}
  .specs-grid{grid-template-columns:repeat(2,1fr)}
  .nav-links{display:none}
  .hero h1{font-size:32px}
  .hero{padding:64px 0 56px}
  .f-top{grid-template-columns:1fr 1fr}
  .trust-grid{flex-direction:column;gap:14px}
  .brand img{height:52px}
  .brand-sub{font-size:10px;letter-spacing:.16em}
}

/* ============ 移动端适配（2026-09-18 补齐） ============ */
.cols-2{grid-template-columns:1fr 1fr}
.cols-3{grid-template-columns:repeat(3,1fr)}
.cols-4{grid-template-columns:repeat(4,1fr)}
.nav-toggle{display:none}
.nav-burger{display:none}
@media(max-width:960px){
  .cols-2,.cols-3,.cols-4{grid-template-columns:1fr 1fr}
  .thumbs{grid-template-columns:repeat(3,1fr)}
  table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch;max-width:100%}
  .nav-in{flex-wrap:wrap;gap:10px;padding:10px 20px}
  .nav-burger{display:flex;flex-direction:column;justify-content:center;gap:5px;width:46px;height:42px;padding:0 11px;margin-left:auto;cursor:pointer;border:1px solid var(--line);border-radius:10px;background:#fff}
  .nav-burger span{display:block;height:2px;background:var(--ink);border-radius:2px;transition:.22s}
  .nav-toggle:checked ~ .nav-burger span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav-toggle:checked ~ .nav-burger span:nth-child(2){opacity:0}
  .nav-toggle:checked ~ .nav-burger span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .nav-links{display:none;order:9;width:100%;flex-direction:column;align-items:stretch;gap:0;margin-top:8px;padding-top:4px;border-top:1px solid var(--line)}
  .nav-toggle:checked ~ .nav-links{display:flex}
  .nav-links a{padding:14px 2px;border-bottom:1px solid var(--line);font-size:15px}
  .nav-links a::after{display:none}
  .nav-links a.btn-quote{margin:12px 0 4px;padding:13px 18px;border-bottom:0;text-align:center;justify-content:center}
}
@media(max-width:640px){
  .cols-2,.cols-3,.cols-4,.hero-grid,.picks-grid,.b2b-grid,.contact-cards,.concept-grid,.specs-grid,.f-top{grid-template-columns:1fr}
  .thumbs{grid-template-columns:1fr 1fr}
  .wrap{padding:0 18px}
  .section{padding:52px 0}
  .sec-head{margin-bottom:32px}
  .sec-head h2{font-size:25px}
  .sec-head .desc{font-size:15px}
  .hero{padding:44px 0 38px}
  .hero h1{font-size:27px;line-height:1.22}
  .hero-sub{font-size:15.5px}
  .hero-stats{gap:18px 26px}
  .hero-stats .item .v{font-size:23px}
  .hero-ctas{flex-direction:column;align-items:stretch}
  .hero-ctas a{justify-content:center;width:100%}
  .nav-in{padding:9px 16px}
  .brand img{height:42px}
  .brand-sub{font-size:9px;letter-spacing:.13em}
  .trust-strip{padding:20px 0}
  .cta-band{padding:28px 18px}
  .btn-primary,.btn-secondary{padding:14px 20px;font-size:15px}
  .nav-links a{padding:15px 2px}
  table{font-size:13.5px}
}

@media (min-width:900px){.hero-bg{background-image:url(/assets/opt/hero-bg.webp)}}