:root{--ink:#071c2d;--ocean:#0e425f;--steel:#dce6ea;--gold:#c49a57;--paper:#f7f9fa;--muted:#60717d;--line:rgba(7,28,45,.14);font-family:"Microsoft YaHei",system-ui,sans-serif;color:var(--ink);background:var(--paper)}
*{box-sizing:border-box}body{margin:0;line-height:1.7}a{color:inherit;text-decoration:none}.site-header{min-height:76px;padding:0 6vw;display:flex;align-items:center;justify-content:space-between;background:#fff;position:sticky;top:0;z-index:4;border-bottom:1px solid var(--line)}.brand{font-weight:700;font-size:21px;letter-spacing:1px}.brand span{display:block;font-size:8px;letter-spacing:2px;color:var(--muted)}nav{display:flex;gap:24px;font-size:14px}.menu-toggle{display:none;border:0;background:none;font:inherit}.hero{min-height:570px;padding:9vw 10vw;display:flex;flex-direction:column;justify-content:center;color:#fff;background:radial-gradient(circle at 86% 25%,rgba(97,190,203,.36),transparent 25%),linear-gradient(125deg,#061a2b,#0d3955 55%,#1d6273);position:relative;overflow:hidden}.hero:after{content:"";position:absolute;right:-8rem;bottom:-10rem;width:38rem;height:38rem;border:1px solid rgba(255,255,255,.15);border-radius:50%}.hero>*{position:relative;z-index:1}.eyebrow{color:#a9e0e8;letter-spacing:4px;font-size:12px}.hero h1{font-size:clamp(38px,5vw,70px);line-height:1.18;font-weight:500;margin:8px 0 16px}.hero>p:not(.eyebrow){max-width:560px;color:#d8e9ec}.button-primary,.button-secondary{display:inline-block;padding:12px 22px;margin:10px 12px 0 0;font-size:14px}.button-primary{background:var(--gold);color:#082031}.button-secondary{border:1px solid currentColor}.section{padding:76px 8vw}.section-head{max-width:650px;margin-bottom:32px}.section-head p{color:var(--muted)}h2{font-size:clamp(26px,3vw,40px);line-height:1.35;font-weight:500;margin:0 0 12px}.grid{display:grid;gap:18px}.four{grid-template-columns:repeat(4,1fr)}.three{grid-template-columns:repeat(3,1fr)}.card{padding:25px;background:#fff;border:1px solid var(--line);min-height:172px}.card small,.product-index{color:var(--gold);letter-spacing:2px}.card h3{font-size:19px;margin:8px 0}.card p{color:var(--muted);font-size:14px}.dark{background:var(--ink);color:#fff}.dark p{color:#c8d8df}.application{min-height:230px;padding:24px;display:flex;flex-direction:column;justify-content:flex-end;background:linear-gradient(145deg,#0d4b67,#123044);color:#fff}.application:nth-child(2){background:linear-gradient(145deg,#516872,#142733)}.application:nth-child(3){background:linear-gradient(145deg,#176276,#0a2636)}.application:nth-child(4){background:linear-gradient(145deg,#42525a,#12283a)}.application p{color:#d4e4e8;font-size:14px}.product-card{padding:28px;background:#fff;border-top:2px solid var(--gold)}.product-card h2{font-size:24px}.product-card p{color:var(--muted)}.product-card a{font-size:14px;color:var(--ocean);font-weight:700}.product-card[hidden]{display:none}.filters{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:28px}.filters button{background:#fff;border:1px solid var(--line);padding:9px 12px;color:var(--ink)}.split{display:grid;grid-template-columns:1fr 1fr;gap:42px;align-items:start}.strength-list{border-top:1px solid var(--line)}.strength-list div{padding:18px 0;border-bottom:1px solid var(--line)}.site-footer{padding:42px 8vw;background:#061a2b;color:#c9d9de;font-size:13px}.site-footer strong{color:#fff;font-size:20px}.form{display:grid;gap:16px;max-width:650px}.form label{display:grid;gap:7px;font-size:14px}.form input,.form textarea{padding:12px;border:1px solid var(--line);font:inherit}.form textarea{min-height:130px}.form-status{color:var(--ocean)}.page-hero{padding:86px 8vw 54px;background:linear-gradient(135deg,#edf3f5,#dbe8ec)}.page-hero p{color:var(--muted);max-width:600px}@media(max-width:760px){.site-header{padding:0 6vw;display:grid;grid-template-columns:1fr auto}.menu-toggle{display:block}.site-header nav{display:none;grid-column:1/-1;flex-direction:column;padding:16px 0}.site-header nav.is-open{display:flex}.hero{min-height:520px;padding:15vw 7vw}.section{padding:56px 7vw}.four,.three,.split{grid-template-columns:1fr}.card{min-height:auto}.site-footer{padding:34px 7vw}.hero h1{font-size:42px}}

/* Verified repair: white cards always define readable foregrounds, including dark sections. */
.card{color:var(--ink)}.dark .card p{color:#52636f}.dark .card small{color:#795722}
.product-image{display:block;width:100%;height:180px;object-fit:contain;background:#fff;margin:0 0 18px}.product-card{display:flex;flex-direction:column}.product-card a{margin-top:auto}.product-card h2{overflow-wrap:anywhere}
.filters button{font:inherit;cursor:pointer;min-height:44px}.filters button[aria-pressed="true"]{background:var(--ink);color:#fff;border-color:var(--ink)}
.contact-guide{background:#fff;border:1px solid var(--line);padding:24px}.contact-guide h2{font-size:26px}.contact-guide ol{padding-left:1.5em}.contact-guide li{margin:12px 0}.contact-notice{padding:14px;border-left:4px solid var(--ocean);background:#edf3f5}.contact-guide p{overflow-wrap:anywhere}
.page-hero .eyebrow,.section:not(.dark) .eyebrow{color:var(--ocean)}

/* Readable labels; filters are only presented once their handlers are ready. */
.card small{color:#795722}.filters{display:none}.filters-ready .filters{display:flex}