:root{
  --navy:#1f3a5f; --navy-d:#16294370; --blue:#2f5f9e; --accent:#c8962e;
  --ink:#23282f; --muted:#5b6470; --line:#e3e8ee; --bg:#ffffff; --soft:#f5f7fa;
  --radius:12px; --shadow:0 6px 24px rgba(31,58,95,.08); --wrap:1180px;
}
*{box-sizing:border-box} html{scroll-behavior:smooth}
body{margin:0;font-family:"Microsoft YaHei","PingFang SC","Segoe UI",Arial,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none} img{max-width:100%;display:block}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 20px}
h1,h2,h3,h4{line-height:1.35;color:var(--ink)} h1{font-size:32px;margin:.2em 0 .4em}
h2{font-size:24px;margin:1.4em 0 .6em} .lead{font-size:18px;color:var(--muted);margin:.4em 0 1.2em}
.note{font-size:13px;color:var(--muted);background:var(--soft);border-left:3px solid var(--accent);
  padding:10px 14px;border-radius:0 8px 8px 0;margin:16px 0}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);
  backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:24px;height:66px}
.brand{display:flex;flex-direction:column;line-height:1}
.brand-mark{font-size:22px;font-weight:800;color:var(--navy);letter-spacing:1px}
.brand-sub{font-size:12px;color:var(--accent);letter-spacing:3px;margin-top:3px}
.main-nav{display:flex;gap:6px;margin-left:auto;flex-wrap:wrap}
.main-nav a{padding:8px 14px;border-radius:8px;color:var(--muted);font-size:15px;transition:.2s}
.main-nav a:hover{color:var(--navy);background:var(--soft)}
.main-nav a.active{color:var(--navy);font-weight:700}
.header-tel{color:var(--navy);font-weight:700;font-size:15px;white-space:nowrap}

/* hero */
.hero{position:relative;color:#fff;overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:0}
.hero-bg img{width:100%;height:100%;object-fit:cover}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(120deg,#1f3a5fee,#1f3a5f88);z-index:1}
.hero-inner{position:relative;z-index:2;padding:84px 20px 92px;max-width:var(--wrap)}
.hero h1{color:#fff;font-size:42px;margin:0 0 10px}
.hero-tag{font-size:20px;color:#ffd98a;margin:0 0 18px;font-weight:600}
.hero-desc{font-size:17px;max-width:640px;color:#e8eef5;margin:0 0 28px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-block;padding:12px 26px;border-radius:30px;font-weight:700;font-size:15px;transition:.2s;cursor:pointer}
.btn-primary{background:var(--accent);color:#fff} .btn-primary:hover{background:#b3821f}
.btn-ghost{background:transparent;color:#fff;border:1px solid #ffffff88} .btn-ghost:hover{background:#ffffff22}
.btn-light{background:#fff;color:var(--navy)} .btn-light:hover{background:#f0f3f7}
.btn.block{display:block;text-align:center;margin-top:10px}

/* band */
.band{background:var(--navy);color:#fff}
.band-grid{display:grid;grid-template-columns:repeat(4,1fr);text-align:center;padding:26px 20px}
.band-item strong{display:block;font-size:26px;color:#ffd98a} .band-item span{font-size:14px;color:#cdd8e6}

/* sections */
.section{padding:54px 0} .section-alt{background:var(--soft)}
.section-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:26px;border-bottom:2px solid var(--line);padding-bottom:10px}
.section-head h2{margin:0} .section-head a{color:var(--blue);font-size:15px;font-weight:600}

/* product cards */
.pcards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.pcards.two{grid-template-columns:repeat(2,1fr)}
.pcard{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow);transition:.2s;display:flex;flex-direction:column}
.pcard:hover{transform:translateY(-4px);border-color:#cdd8e6}
.pcard-img img{width:100%;aspect-ratio:16/10;object-fit:cover}
.pcard-body{padding:18px}
.pcard-body h3{margin:0 0 8px;font-size:19px;color:var(--navy)}
.pcard-body p{margin:0 0 12px;color:var(--muted);font-size:14px}
.more{color:var(--blue);font-weight:600;font-size:14px}
.badge{display:inline-block;background:#fbe6c2;color:#9a6b12;font-size:12px;padding:2px 8px;border-radius:20px;vertical-align:middle;font-weight:700}
.chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.chip{padding:7px 16px;background:#fff;border:1px solid var(--line);border-radius:20px;font-size:14px;color:var(--muted)}
.chip:hover{border-color:var(--blue);color:var(--blue)}

/* features */
.features{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.feature{background:#fff;border:1px solid var(--line);border-radius:10px;padding:18px}
.feature:hover{border-color:var(--blue)} .feature h4{margin:0 0 8px;color:var(--navy);font-size:16px}
.feature p{margin:0;font-size:13px;color:var(--muted)}

/* scenes */
.scenes{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.scene{border-radius:10px;overflow:hidden;border:1px solid var(--line);background:#fff}
.scene img{width:100%;aspect-ratio:3/2;object-fit:cover}
.scene-cap{padding:14px} .scene-cap strong{display:block;color:var(--navy)} .scene-cap span{font-size:13px;color:var(--muted)}

/* knowledge */
.kcards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.kcard{background:#fff;border:1px solid var(--line);border-radius:10px;padding:22px;transition:.2s}
.kcard:hover{transform:translateY(-3px);border-color:#cdd8e6;box-shadow:var(--shadow)}
.kcard h3,.kcard h4{margin:0 0 10px;color:var(--navy);font-size:17px}
.kcard p{margin:0 0 12px;color:var(--muted);font-size:14px}

/* cta band */
.cta-band{background:linear-gradient(120deg,var(--navy),var(--blue));color:#fff}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:40px 20px;flex-wrap:wrap}
.cta-inner h2{color:#fff;margin:0 0 6px} .cta-inner p{margin:0;color:#dbe6f3}

/* crumb / tags */
.crumb{font-size:13px;color:var(--muted);margin-bottom:18px}
.crumb a{color:var(--blue)}
.tags{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0}
.tag{background:var(--soft);color:var(--muted);padding:5px 12px;border-radius:6px;font-size:13px}

/* product detail */
.product-top{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:center;margin-bottom:30px}
.product-gallery img{width:100%;border-radius:var(--radius);border:1px solid var(--line)}
.aliases{color:var(--muted);font-size:14px;margin:0 0 12px}
.detail-grid{display:grid;grid-template-columns:1fr 300px;gap:34px;align-items:start}
.feature-list{padding-left:0;list-style:none}
.feature-list li{padding:8px 0 8px 26px;position:relative;border-bottom:1px dashed var(--line)}
.feature-list li::before{content:"✓";position:absolute;left:0;color:var(--accent);font-weight:800}
.spec-table{width:100%;border-collapse:collapse;margin:10px 0}
.spec-table th,.spec-table td{border:1px solid var(--line);padding:11px 14px;text-align:left;font-size:14px}
.spec-table th{background:var(--soft);color:var(--navy);width:40%;font-weight:600}
.layer-list{padding-left:20px} .layer-list li{padding:4px 0}
.layer-box{background:var(--soft);border-radius:var(--radius);padding:20px 24px;margin:18px 0}
.side-card{background:var(--soft);border:1px solid var(--line);border-radius:var(--radius);padding:22px;position:sticky;top:84px}
.side-card h3{margin:0 0 10px;color:var(--navy)} .side-name{font-size:20px;font-weight:800;color:var(--navy);margin:4px 0}

/* tech blocks */
.tech-block{display:grid;grid-template-columns:420px 1fr;gap:28px;align-items:center;
  padding:26px 0;border-top:1px solid var(--line)}
.tech-block:nth-child(even) .tech-img{order:2}
.tech-img img{width:100%;border-radius:var(--radius);border:1px solid var(--line)}
.tech-text ul{padding-left:20px} .tech-text li{margin:6px 0}

/* steps */
.steps{list-style:none;padding:0;counter-reset:s}
.steps li{display:flex;gap:16px;align-items:flex-start;padding:16px;background:#fff;border:1px solid var(--line);border-radius:10px;margin-bottom:12px}
.step-n{flex:0 0 36px;height:36px;width:36px;border-radius:50%;background:var(--navy);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:800}
.steps strong{color:var(--navy)} .steps p{margin:4px 0 0;color:var(--muted);font-size:14px}

/* article */
.article{max-width:820px} .article-body p{margin:0 0 16px}
.article-cta{margin-top:30px;padding:24px;background:var(--soft);border-radius:var(--radius);text-align:center}
.article-cta p{margin:0 0 14px;color:var(--muted)}

/* about / colors / contact / faq */
.about-grid{display:grid;grid-template-columns:1fr 420px;gap:32px;align-items:center}
.about-img img{width:100%;border-radius:var(--radius);border:1px solid var(--line)}
.swatches{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:14px}
.swatch{display:flex;align-items:center;gap:12px;font-size:14px}
.swatch span{width:40px;height:40px;border-radius:8px;border:1px solid #00000018;display:inline-block}
.contact-card{background:var(--soft);border:1px solid var(--line);border-radius:var(--radius);padding:8px 24px;max-width:560px}
.contact-line{display:flex;justify-content:space-between;padding:14px 0;border-bottom:1px solid var(--line)}
.contact-line:last-of-type{border-bottom:none} .contact-line span{color:var(--muted)}
.contact-line strong{color:var(--navy)}
.faqs{max-width:820px}
.faq{border:1px solid var(--line);border-radius:10px;padding:4px 18px;margin-bottom:10px;background:#fff}
.faq summary{cursor:pointer;font-weight:600;color:var(--navy);padding:12px 0;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+ ";color:var(--accent);font-weight:800}
.faq[open] summary::before{content:"– "}
.faq p{margin:0 0 14px;color:var(--muted)}

/* footer */
.site-footer{background:#16243a;color:#c3cfe0;margin-top:40px;font-size:14px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1.4fr;gap:30px;padding:44px 20px 26px}
.footer-brand{font-size:18px;font-weight:800;color:#fff;margin-bottom:10px}
.footer-col p{margin:4px 0} .footer-bases{color:#8ea1bd}
.footer-h{color:#fff;font-weight:700;margin-bottom:12px}
.footer-links{display:flex;flex-direction:column;gap:8px} .footer-links a:hover{color:#fff}
.footer-col a{color:#c3cfe0} .footer-bottom{border-top:1px solid #ffffff1a;padding:18px 20px;font-size:12px;color:#8ea1bd}
.footer-bottom .disclaimer{margin:0 0 6px}

/* responsive */
@media(max-width:900px){
  .pcards,.pcards.two,.kcards,.scenes{grid-template-columns:1fr 1fr}
  .features{grid-template-columns:1fr 1fr}
  .band-grid{grid-template-columns:1fr 1fr;gap:18px}
  .product-top,.detail-grid,.about-grid,.tech-block,.footer-grid{grid-template-columns:1fr}
  .tech-block:nth-child(even) .tech-img{order:0}
  .main-nav{display:none} .hero h1{font-size:32px}
}
@media(max-width:560px){
  .pcards,.pcards.two,.kcards,.scenes,.features,.swatches{grid-template-columns:1fr}
  .header-tel{display:none} h1{font-size:26px}
}

/* hero carousel（纯 CSS + 极简 JS，无依赖） */
.carousel{position:relative}
.slides{position:absolute;inset:0;z-index:0}
.slide{position:absolute;inset:0;opacity:0;transition:opacity .9s ease}
.slide.active{opacity:1}
.slide img{width:100%;height:100%;object-fit:cover}
.dots{position:absolute;left:0;right:0;bottom:22px;z-index:3;display:flex;gap:10px;justify-content:center}
.dot{width:10px;height:10px;border-radius:50%;background:#ffffff66;border:none;cursor:pointer;padding:0}
.dot.active{background:var(--accent)}

/* install steps（图文） */
.istep{display:grid;grid-template-columns:380px 1fr;gap:24px;align-items:center;
  padding:20px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);margin-bottom:18px}
.istep:nth-child(even) .istep-img{order:2}
.istep-img img{width:100%;border-radius:10px;border:1px solid var(--line)}
.istep-no{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;
  border-radius:50%;background:var(--navy);color:#fff;font-weight:800;font-size:15px;margin-right:8px}
.istep h3{margin:0 0 8px;color:var(--navy);font-size:19px;display:flex;align-items:center}
.istep p{margin:0 0 10px;color:var(--muted);font-size:14px}
.istep .feature-list li{font-size:14px}

/* accessories（图文卡） */
.acc-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:12px}
.acc{display:flex;gap:8px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 16px}
.acc strong{color:var(--navy);white-space:nowrap}
.acc span{color:var(--muted);font-size:14px}

/* pitfalls */
.pit-grid{display:grid;grid-template-columns:1fr;gap:14px}
.pit{background:#fff;border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:10px;padding:18px 20px}
.pit h3{margin:0 0 8px;color:var(--navy);font-size:18px}
.pit .pit-no{color:var(--accent);font-weight:800;margin-right:8px}
.pit p{margin:6px 0;font-size:14px;color:var(--muted)}
.pit .howto{color:var(--ink)} .pit .howto b{color:var(--navy)}

/* cases */
.case-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.case-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow);transition:.2s;display:flex;flex-direction:column}
.case-card:hover{transform:translateY(-4px)}
.case-card img{width:100%;aspect-ratio:16/10;object-fit:cover}
.case-card .cc-body{padding:16px}
.case-card h3{margin:0 0 8px;color:var(--navy);font-size:17px}
.case-meta{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0}
.case-meta span{background:var(--soft);color:var(--muted);font-size:12px;padding:3px 9px;border-radius:6px}

/* footer social + qr */
.footer-social{display:flex;gap:10px;margin:10px 0 4px;flex-wrap:wrap}
.footer-social a{display:inline-flex;align-items:center;justify-content:center;height:32px;padding:0 14px;
  border:1px solid #ffffff33;border-radius:18px;color:#c3cfe0;font-size:13px}
.footer-social a:hover{border-color:var(--accent);color:#fff}
.footer-qr{display:flex;gap:16px;margin-top:6px;flex-wrap:wrap}
.qr-item{text-align:center;font-size:12px;color:#8ea1bd}
.qr-item img{width:96px;height:96px;border-radius:8px;background:#fff;margin-bottom:6px}
@media(max-width:900px){.istep,.case-cards{grid-template-columns:1fr}.istep:nth-child(even) .istep-img{order:0}.acc-grid{grid-template-columns:1fr}}
@media(max-width:560px){.case-cards{grid-template-columns:1fr}}