:root{
  --navy:#0b2e59;
  --blue:#155da8;
  --orange:#f68b1f;
  --ink:#1b2638;
  --muted:#667085;
  --line:#dbe4ee;
  --soft:#f6f9fc;
  --white:#fff;
  --shadow:0 14px 40px rgba(15,23,42,.08);
  --radius:22px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;color:var(--ink);background:#fff;line-height:1.65}
img{max-width:100%;display:block}
a{color:inherit}
.container{width:min(1180px,calc(100% - 32px));margin:auto}
.topbar{background:var(--navy);color:#fff;font-size:.84rem}
.topbar .container{min-height:34px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.topbar a{text-decoration:none}
.header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav{min-height:74px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;text-decoration:none;min-width:0}
.brand img{width:220px;height:auto;max-height:52px;object-fit:contain}
.nav-links{display:flex;align-items:center;gap:22px}
.nav-links a{text-decoration:none;font-weight:700;color:#344054;font-size:.95rem}
.nav-links a:hover,.nav-links a.active{color:var(--blue)}
.nav-links .cta{background:var(--orange);color:#fff;padding:10px 16px;border-radius:999px}
.menu-btn{display:none;border:1px solid var(--line);background:#fff;border-radius:10px;padding:9px 12px;font-weight:800}
.hero{padding:78px 0;background:linear-gradient(180deg,#f8fbff,#fff);border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:50px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border-radius:999px;background:#eaf3fb;color:var(--blue);border:1px solid #cfe2f4;font-size:.78rem;font-weight:850;letter-spacing:.04em;text-transform:uppercase}
.eyebrow:before{content:"";width:8px;height:8px;border-radius:50%;background:var(--orange)}
h1,h2,h3{color:var(--navy);line-height:1.1;letter-spacing:-.035em}
h1{font-size:clamp(2.5rem,5vw,4.8rem);margin:18px 0}
h2{font-size:clamp(2rem,3.4vw,3.1rem);margin:10px 0 14px}
h3{font-size:1.45rem}
.lead{font-size:1.08rem;color:#475467;max-width:760px}
.button-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}
.button{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 18px;border-radius:11px;font-weight:800;text-decoration:none;border:1px solid transparent}
.button.primary{background:var(--blue);color:#fff}
.button.secondary{background:#fff;color:var(--navy);border-color:var(--line)}
.hero-media{border-radius:26px;overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--line);background:#fff}
.hero-media img{width:100%;height:100%;max-height:520px;object-fit:cover}
section{padding:82px 0}
.section-soft{background:var(--soft)}
.section-head{display:grid;grid-template-columns:.9fr 1.1fr;gap:36px;align-items:end;margin-bottom:36px}
.section-head p{margin:0;color:var(--muted)}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.card{background:#071c35;border:1px solid #1a3450;border-radius:var(--radius);overflow:hidden;box-shadow:0 10px 26px rgba(15,23,42,.05)}
.card img{width:100%;height:280px;object-fit:contain;padding:16px;background:#e8ecf0}
.card .contain{object-fit:contain;padding:16px}
.card-body{padding:22px}
.card-body h3{font-size:1rem;font-weight:600;margin:0 0 12px;color:#fff}
.card-body .button.secondary{font-size:.82rem;padding:7px 14px;min-height:auto;background:transparent;color:#cfe0f2;border-color:rgba(255,255,255,.25)}
.card-body .button.secondary:hover{background:rgba(255,255,255,.1);color:#fff}
.meta{font-size:.8rem;color:var(--orange);font-weight:850;text-transform:uppercase;letter-spacing:.04em}
.card p{color:var(--muted)}
.page-hero{padding:62px 0 48px;background:linear-gradient(180deg,#f7fbff,#fff);border-bottom:1px solid var(--line)}
.page-hero h1{font-size:clamp(2.4rem,4vw,4rem)}

/* 分类导航锚点 */
.category-nav{background:var(--soft);padding:14px 0;border-bottom:1px solid var(--line);position:sticky;top:74px;z-index:99}
.category-nav .container{display:flex;align-items:center;gap:8px;overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none}
.category-nav .container::-webkit-scrollbar{display:none}
.cat-nav-label{font-size:.82rem;font-weight:700;color:var(--muted);white-space:nowrap;margin-right:4px}
.category-nav a{text-decoration:none;font-size:.84rem;font-weight:600;color:var(--ink);padding:6px 14px;border-radius:999px;white-space:nowrap;background:var(--white);border:1px solid var(--line);transition:all .2s}
.category-nav a:hover{background:var(--blue);color:#fff;border-color:var(--blue)}
/* 侧边栏产品列表 */
.products-layout{display:flex;gap:0;align-items:flex-start}
.product-sidebar{width:260px;flex-shrink:0;position:sticky;top:138px;max-height:calc(100vh - 160px);overflow-y:auto;background:var(--white);border-right:1px solid var(--line);padding:20px 0;display:none}
.product-sidebar.active{display:block}
.products-content{flex:1;min-width:0}
.sidebar-header{font-size:.82rem;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.04em;padding:0 20px 12px;border-bottom:1px solid var(--line);margin-bottom:8px}
.sidebar-list{list-style:none;padding:0;margin:0}
.sidebar-list li{border-bottom:1px solid var(--line)}
.sidebar-list a{display:block;padding:10px 20px;text-decoration:none;font-size:.85rem;color:var(--ink);line-height:1.4;transition:background .15s}
.sidebar-list a:hover{background:var(--soft);color:var(--blue)}
@media(max-width:900px){.product-sidebar{display:none!important}}

.breadcrumb{font-size:.9rem;color:var(--muted);margin-bottom:14px}
.breadcrumb a{color:var(--blue);text-decoration:none}
.about-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:24px}
.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:0 10px 26px rgba(15,23,42,.05)}
.panel p{color:#475467}
.info-stack{display:grid;gap:16px}
.info-box{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px}
.info-box strong{display:block;color:var(--navy);margin-bottom:5px}
.info-box span{color:var(--muted);font-size:.92rem}
.gallery{display:grid;grid-template-columns:1.2fr .8fr;gap:18px}
.gallery .stack{display:grid;gap:18px}
.gallery figure{margin:0;border:1px solid var(--line);border-radius:20px;overflow:hidden;background:#fff;box-shadow:0 10px 24px rgba(15,23,42,.05)}
.gallery img{width:100%;height:100%;min-height:260px;object-fit:cover}
.gallery figcaption{padding:12px 15px;color:var(--muted);font-size:.9rem;border-top:1px solid var(--line)}
.product-detail{display:grid;grid-template-columns:1.1fr 1fr;gap:40px;align-items:start}
.product-image{border:1px solid var(--line);border-radius:22px;background:#f7f9fb;padding:18px}
.product-image img{width:100%;object-fit:contain}
.product-thumbs{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:18px}
.product-thumbs .thumb{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff;cursor:pointer;transition:border-color .2s,box-shadow .2s}
.product-thumbs .thumb:hover{border-color:var(--blue);box-shadow:0 6px 16px rgba(21,93,168,.12)}
.product-thumbs .thumb img{width:100%;height:180px;object-fit:contain;display:block;background:#f7f9fb;padding:10px}
.product-thumbs .thumb span{display:block;padding:6px 8px;font-size:.78rem;color:var(--muted);text-align:center;border-top:1px solid var(--line);background:#fafbfc}
.product-thumbs .thumb .zoom-badge{position:absolute;top:8px;right:8px;background:rgba(0,0,0,.55);color:#fff;border-radius:8px;padding:4px 8px;font-size:.7rem;font-weight:700;pointer-events:none}
.product-thumbs .thumb{position:relative}

/* Lightbox */
.lightbox-overlay{display:none;position:fixed;inset:0;z-index:9999;background:rgba(0,0,0,.88);backdrop-filter:blur(8px);justify-content:center;align-items:center;padding:24px;cursor:pointer}
.lightbox-overlay.open{display:flex}
.lightbox-overlay img{max-width:min(90vw,1400px);max-height:min(90vh,1000px);object-fit:contain;border-radius:12px;box-shadow:0 20px 60px rgba(0,0,0,.5);cursor:default}
.lightbox-close{position:absolute;top:20px;right:24px;color:#fff;font-size:2.2rem;line-height:1;cursor:pointer;opacity:.7;transition:opacity .2s;background:rgba(0,0,0,.3);width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;border:none}
.lightbox-close:hover{opacity:1}
.lightbox-nav{position:absolute;top:50%;transform:translateY(-50%);color:#fff;font-size:2.5rem;cursor:pointer;opacity:.6;transition:opacity .2s;padding:12px;user-select:none;background:rgba(0,0,0,.2);border-radius:50%;width:50px;height:50px;display:flex;align-items:center;justify-content:center;border:none}
.lightbox-nav:hover{opacity:1}
.lightbox-prev{left:20px}
.lightbox-next{right:20px}
.lightbox-counter{position:absolute;bottom:24px;left:50%;transform:translateX(-50%);color:rgba(255,255,255,.7);font-size:.9rem;background:rgba(0,0,0,.4);padding:6px 14px;border-radius:999px}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0}
.chip{padding:6px 10px;border-radius:999px;background:#eaf3fb;color:var(--blue);border:1px solid #cfe2f4;font-size:.78rem;font-weight:800}
.spec{margin-top:20px;padding:22px;border:1px solid var(--line);border-radius:18px;background:#fff}
.spec h3{margin-top:0}
.spec ul,.spec ol{padding-left:20px}
.spec li{margin-bottom:7px;color:#475467}
table{width:100%;border-collapse:collapse}
th,td{padding:11px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
th{width:34%;background:#f8fafc;color:var(--navy)}
.notice{margin-top:18px;padding:14px 16px;border-radius:12px;background:#fff7ed;border:1px solid #fed7aa;color:#9a4b09;font-size:.9rem}
.contact-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:24px}
.contact-dark{background:var(--navy);color:#fff;border-radius:24px;padding:30px}
.contact-dark h2{color:#fff}
.contact-dark p{color:rgba(255,255,255,.75)}
.contact-list{display:grid;gap:13px;margin-top:22px}
.contact-item{padding:15px;border-radius:13px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12)}
.contact-item small{display:block;color:rgba(255,255,255,.55)}
.contact-item a{text-decoration:none;font-weight:800}
footer{background:#071c35;color:rgba(255,255,255,.72);padding:26px 0;font-size:.86rem}
footer .container{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
footer a{color:#fff;text-decoration:none}
@media(max-width:980px){
  .hero-grid,.section-head,.about-grid,.gallery,.product-detail,.contact-grid{grid-template-columns:1fr}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .product-image{position:static}
  .product-thumbs .thumb img{height:140px}
  .menu-btn{display:block}
  .nav-links{display:none;position:absolute;top:74px;left:16px;right:16px;padding:16px;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch}
  .nav-links.open{display:flex}
  .nav-links a{padding:8px 4px}
  .brand img{width:190px;max-height:46px}
}
@media(max-width:640px){
  .container{width:min(100% - 22px,1180px)}
  .topbar .container{padding:8px 0}
  .brand img{width:165px;max-height:40px}
  .nav{min-height:66px}
  .nav-links{top:66px}
  .hero{padding:54px 0}
  section{padding:62px 0}
  .grid-3,.grid-2{grid-template-columns:1fr}
  .card img{height:230px}
  .product-thumbs .thumb img{height:160px}
  .panel,.contact-dark,.spec{padding:22px}
  h1{font-size:2.7rem}
}