:root{--navy:#0e1e38;--navy2:#16305c;--accent:#0577F8;--accent-d:#0260d9;--gray:#475569;--line:#e2e8f0;--alt:#f6f8fb;}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:Inter,Arial,Helvetica,sans-serif;color:var(--gray);font-size:16px;line-height:1.7;background:#fff}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
h1,h2,h3,h4{color:var(--navy);line-height:1.25}
.wrap{max-width:1420px;margin:0 auto;padding:0 20px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 28px;border-radius:999px;font-weight:700;font-size:14px;letter-spacing:.2px;cursor:pointer;border:2px solid transparent;transition:.2s}
.btn-primary{background:#0577f8;color:#fff}
.btn-primary:hover{background:#0b5cd8}
.btn-outline{border-color:rgba(255,255,255,.75);color:#fff;background:transparent}
.btn-outline:hover{background:rgba(255,255,255,.12);border-color:#fff}
.btn-outline-dark{border-color:var(--navy);color:var(--navy);background:transparent}
.btn-outline-dark:hover{background:var(--navy);color:#fff}
.eyebrow{display:inline-block;color:var(--accent);font-weight:700;letter-spacing:2.5px;font-size:12.5px;text-transform:uppercase;margin-bottom:12px}
.sec{padding:76px 0}
.sec-h2{font-size:32px;margin-bottom:12px}
.sub{color:var(--gray);max-width:720px;margin-bottom:44px}
.center{text-align:center}.center .sub{margin-left:auto;margin-right:auto}
/* header */
.topbar{background:var(--navy);color:#94a3b8;font-size:13px;padding:8px 0}
.topbar .wrap{display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap}
.topbar a{color:#fff;font-weight:600}
.topbar a:hover{color:var(--accent)}
header.site{position:sticky;top:0;z-index:60;background:#fff;border-bottom:1px solid var(--line);transition:.2s}
header.site.scrolled{box-shadow:0 6px 20px rgba(20,34,53,.08)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;height:48px}
.logo{display:flex;align-items:center;gap:11px}
.logoimg{height:23px;width:auto;display:block}
.logo-chip{display:inline-block;background:#fff;border-radius:9px;padding:7px 12px;line-height:0}
.logo-chip .logoimg{height:34px}
.logo .mark{width:42px;height:42px;border-radius:8px;background:var(--navy);color:var(--accent);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;letter-spacing:.5px}
.logo b{font-size:20px;color:var(--navy);letter-spacing:1px}
.logo small{display:block;font-size:9.5px;letter-spacing:1.6px;color:var(--gray);font-weight:600}
nav.main{display:flex;gap:26px;font-weight:600;font-size:12.5px;letter-spacing:.3px}
nav.main>a,nav.main .dd>a{color:var(--navy);padding:16px 0;display:inline-block}
nav.main>a:hover,nav.main .dd>a:hover{color:var(--accent)}
nav.main>a.cur,nav.main .dd>a.cur{color:var(--accent);position:relative}
nav.main>a.cur::after,nav.main .dd>a.cur::after{content:"";position:absolute;left:0;right:0;bottom:11px;height:2px;border-radius:2px;background:var(--accent)}
nav.main .dd{position:relative}
nav.main .dd-menu{position:absolute;top:100%;left:-18px;background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:0 14px 34px rgba(20,34,53,.14);min-width:230px;padding:8px 0;display:none}
nav.main .dd:hover .dd-menu{display:block}
nav.main .dd-menu a{display:block;padding:9px 20px;font-size:13.5px;font-weight:500;color:var(--gray)}
nav.main .dd-menu a:hover{background:var(--alt);color:var(--accent)}
.navcta{display:flex;align-items:center;gap:11px}
.navcta .btn{padding:7px 16px;font-size:12px;border-radius:9px}
.burger{display:none;background:none;border:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.burger span{width:24px;height:2.5px;background:var(--navy);border-radius:2px}
/* hero */
.hero{background:linear-gradient(115deg,var(--navy) 0%,var(--navy2) 70%,#1d4a94 100%);color:#fff;padding:86px 0 92px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-160px;bottom:-200px;width:560px;height:560px;border-radius:50%;background:radial-gradient(circle,rgba(47,157,240,.26),transparent 65%)}
.hero .wrap{display:grid;grid-template-columns:5fr 7fr;gap:48px;align-items:center;position:relative;z-index:1}
.hero .eyebrow{color:#45aaf5}
.hero h1{color:#fff;font-size:42px;margin-bottom:18px}
.hero .lead{color:#b6c2d4;font-size:17.5px;max-width:480px;margin-bottom:32px}
.hero .ctas{display:flex;gap:14px;flex-wrap:wrap}
.hero .badges{display:grid;grid-template-columns:repeat(2,auto);gap:20px 46px;margin-top:42px;justify-content:start}
.hero .badges b{display:block;font-size:24px;color:#45aaf5;line-height:1.2}
.hero .badges span{font-size:12.5px;color:#8fa1b8;white-space:nowrap}
.hero-visual{position:relative;background:linear-gradient(160deg,#16305c 0%,#142c52 65%,#0e1e38 100%);border:1px solid rgba(255,255,255,.14);border-radius:18px;padding:36px 30px 24px;box-shadow:0 34px 80px rgba(0,0,0,.5);overflow:visible}
.hero-visual::before{content:"";position:absolute;inset:0;border-radius:18px;background:radial-gradient(62% 56% at 50% 42%,rgba(47,157,240,.26),transparent 72%);pointer-events:none}
.hero-visual img{position:relative;border-radius:10px;aspect-ratio:4/3;object-fit:contain;width:100%;filter:drop-shadow(0 26px 36px rgba(0,0,0,.5))}
.hero-visual .hsvg{display:block;width:100%;height:auto;position:relative;border-radius:10px}
.hero-visual figcaption{position:relative;font-size:12.5px;color:#9db1c7;text-align:center;margin-top:14px;letter-spacing:.4px}
.hero-chip{position:absolute;z-index:2;background:#fff;color:var(--navy);border-radius:9px;padding:8px 14px;font-size:12px;font-weight:800;box-shadow:0 14px 30px rgba(0,0,0,.38);display:flex;align-items:center;gap:8px;white-space:nowrap}
.hero-chip .dot{width:8px;height:8px;border-radius:50%;background:var(--accent);flex-shrink:0}
.chip-a{top:-15px;right:26px}
.chip-b{bottom:74px;left:-20px}
.chip-c{bottom:-15px;right:52px}
@media(max-width:720px){.hero-chip{display:none}}
/* stats strip */
.stats{background:#0c1c38;padding:30px 0;border-top:3px solid var(--accent)}
.stats .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;text-align:center}
.stats b{font-size:28px;color:#fff;display:block}
.stats span{font-size:13px;color:#7e93ad}
/* categories */
.cat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.cat-card{border:1px solid var(--line);border-radius:12px;overflow:hidden;transition:.22s;background:#fff;display:flex;flex-direction:column}
.cat-card:hover{box-shadow:0 16px 40px rgba(20,34,53,.13);transform:translateY(-4px);border-color:#cbd5e1}
.cat-card .ph{aspect-ratio:4/3;background:#f1f5f9;overflow:hidden}
.cat-card .ph img{width:100%;height:100%;object-fit:cover;transition:.3s}
.cat-card:hover .ph img{transform:scale(1.04)}
.cat-card .bd{padding:22px 24px 24px}
.cat-card h3{font-size:19px;margin-bottom:6px}
.cat-card p{font-size:14px;margin-bottom:14px}
.cat-card .more{color:var(--accent);font-weight:700;font-size:13.5px;letter-spacing:.6px}
/* why us */
.why{background:var(--alt)}
.why .grid{display:grid;grid-template-columns:5fr 7fr;gap:44px;align-items:center}
.factory-ph{background:linear-gradient(135deg,var(--navy),var(--navy2));border-radius:14px;aspect-ratio:4/3.4;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#5c7593;gap:10px;text-align:center;padding:28px}
.factory-ph .ico{font-size:46px}
.factory-ph b{color:#8fa5bf;font-size:15px}
.factory-ph span{font-size:12.5px}
.why-item{display:flex;gap:16px;padding:18px 0;border-bottom:1px solid var(--line)}
.why-item:last-child{border-bottom:none}
.why-item .ico{width:46px;height:46px;flex:none;border-radius:10px;background:#fff;border:1px solid var(--line);display:flex;align-items:center;justify-content:center;font-size:20px}
.why-item b{color:var(--navy);font-size:16.5px;display:block;margin-bottom:3px}
.why-item p{font-size:14px}
/* products */
.prod-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:36px;flex-wrap:wrap}
.prod-head .sub{margin-bottom:0}
.viewall{color:var(--accent);font-weight:700;font-size:14px;letter-spacing:.6px;white-space:nowrap}
.prod-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.pcard{border:1px solid var(--line);border-radius:12px;overflow:hidden;display:flex;flex-direction:column;background:#fff;transition:.22s}
.pcard:hover{box-shadow:0 16px 40px rgba(20,34,53,.12);transform:translateY(-4px)}
.pcard .ph{aspect-ratio:4/3;background:#fff;overflow:hidden;position:relative}
.pcard .ph img{width:100%;height:100%;object-fit:contain;padding:10px;transition:.3s}
.pcard:hover .ph img{transform:scale(1.05)}
.pcard .sku{font-size:11.5px;font-weight:800;letter-spacing:1px;color:var(--accent);line-height:1}
.pcard .bd{padding:18px 18px 20px;display:flex;flex-direction:column;gap:9px;flex:1}
.pcard h3{font-size:15px;line-height:1.45}
.pcard .meta{font-size:12.5px;color:#7e8b9d}
.pcard ul{font-size:12.5px;color:var(--gray)}
.pcard ul li{padding-left:15px;position:relative;margin-bottom:3px}
.pcard ul li::before{content:"";position:absolute;left:0;top:8px;width:6px;height:6px;border-radius:50%;background:var(--accent)}
.pcard .more{margin-top:auto;padding-top:10px;color:var(--navy);font-weight:700;font-size:12.5px;letter-spacing:.8px}
.pcard .more:hover{color:var(--accent)}
/* OEM band */
.oem-band{background:linear-gradient(115deg,var(--navy),var(--navy2));color:#fff;padding:72px 0}
.oem-band .wrap{display:grid;grid-template-columns:6fr 6fr;gap:48px;align-items:center}
.oem-band .combo{background:#fff;border-radius:14px;padding:22px;box-shadow:0 26px 60px rgba(0,0,0,.4)}
.oem-band h2{color:#fff;font-size:32px;margin-bottom:14px}
.oem-band p{color:#b6c2d4;margin-bottom:26px}
.oem-icons{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-bottom:30px}
.oem-icons div{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:10px;padding:14px 16px;font-size:14px;font-weight:600;color:#dbe4ef}
.oem-icons span{color:var(--accent);margin-right:8px}
/* factory */
.fac-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:38px}
.fac-card{border:1px solid var(--line);border-radius:12px;padding:28px;background:#fff}
.fac-card .ico{width:52px;height:52px;border-radius:12px;background:var(--alt);display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:16px}
.fac-card b{display:block;color:var(--navy);font-size:17px;margin-bottom:8px}
.fac-card p{font-size:14px}
/* process */
.process{background:var(--alt)}
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:20px;counter-reset:s}
.step{background:#fff;border:1px solid var(--line);border-radius:12px;padding:26px 22px;position:relative}
.step .num{width:42px;height:42px;border-radius:50%;background:var(--accent);color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;margin-bottom:14px;font-size:16px}
.step b{display:block;color:var(--navy);font-size:15.5px;margin-bottom:6px}
.step p{font-size:13px}
/* 4 卡变体：填满整行，与上下区块齐平（About Milestones） */
.steps.m4{grid-template-columns:repeat(4,minmax(0,1fr))}
@media(max-width:1080px){.steps.m4{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:520px){.steps.m4{grid-template-columns:1fr}}
/* MILESTONE 时间轴（About Us） */
.tl{position:relative}
.tl-line{position:absolute;left:10%;right:10%;top:37px;height:2px;background:rgba(5,119,248,.28);z-index:0}
.tl-grid{position:relative;z-index:1;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:18px}
.tl-item{display:flex;flex-direction:column;text-align:center}
.tl-yr{height:24px;flex:none;line-height:24px;font-weight:800;color:var(--navy);font-size:15px;letter-spacing:.2px;white-space:nowrap}
.tl-node{height:26px;flex:none;position:relative}
.tl-node::after{content:"";position:absolute;left:50%;top:4px;transform:translateX(-50%);width:18px;height:18px;border-radius:50%;background:var(--accent);border:4px solid #fff;box-shadow:0 0 0 1px var(--line)}
.tl-item.is-now .tl-node::after{background:var(--navy)}
.tl-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px 18px;text-align:left;flex:1}
.tl-card .tag{display:inline-block;font-size:11px;font-weight:700;letter-spacing:1px;color:var(--accent);background:rgba(5,119,248,.09);border-radius:5px;padding:2px 8px;margin-bottom:9px;text-transform:uppercase}
.tl-card b{display:block;color:var(--navy);font-size:15px;margin-bottom:6px;line-height:1.4}
.tl-card p{font-size:13px;line-height:1.6}
.tl-foot{margin-top:26px;background:#fff;border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:10px;padding:16px 20px;text-align:left;font-size:13.5px;line-height:1.65}
.tl-foot b{color:var(--navy)}
@media(max-width:1080px){
 .tl-line{display:none}
 .tl-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
 .tl-item{text-align:left}
 .tl-yr{height:auto;line-height:1.3;margin-bottom:9px}
 .tl-node{height:auto;margin-bottom:12px}
 .tl-node::after{position:static;transform:none;display:inline-block;top:auto}
}
@media(max-width:520px){.tl-grid{grid-template-columns:1fr}}
/* download */
.dl-card{border:1px solid var(--line);border-radius:14px;padding:34px;background:linear-gradient(180deg,#fff,var(--alt))}
.dl-card .ico{font-size:40px;margin-bottom:14px}
.dl-card b{display:block;color:var(--navy);font-size:19px;margin-bottom:8px}
.dl-card p{font-size:14px;margin-bottom:18px}
/* cta band */
.cta-band{background:var(--navy);color:#fff;padding:64px 0}
.cta-band .wrap{display:flex;align-items:center;justify-content:space-between;gap:26px;flex-wrap:wrap}
.cta-band h2{color:#fff;font-size:28px;margin-bottom:8px}
.cta-band p{color:#9db0c7;font-size:15px}
/* footer */
footer.site{background:#0c1c38;color:#7e93ad;font-size:13.5px;padding:56px 0 0}
footer.site .grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr 1.35fr .9fr;gap:34px;padding-bottom:40px}
footer.site h4{color:#fff;font-size:13.5px;letter-spacing:1px;margin-bottom:16px}
footer.site li{margin-bottom:9px;display:flex;align-items:flex-start;gap:8px}
footer.site a:hover{color:var(--accent)}
footer.site .fbottom{border-top:1px solid rgba(255,255,255,.1);padding:18px 0;font-size:12px;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap}
/* breadcrumb + page banner */
.banner{background:linear-gradient(115deg,var(--navy),var(--navy2));color:#fff;padding:56px 0 48px}
.banner h1{color:#fff;font-size:34px;margin-bottom:8px}
.banner p{color:#9db0c7;max-width:640px}
.crumbs{font-size:13px;color:#7e93ad;margin-bottom:14px}
.crumbs a:hover{color:var(--accent)}
/* catalog page */
.cat-layout{display:grid;grid-template-columns:250px 1fr;gap:38px;padding:56px 0 80px}
.filters{border:1px solid var(--line);border-radius:12px;padding:24px;align-self:start;position:sticky;top:104px}
.filters h4{font-size:13px;letter-spacing:1.4px;margin:18px 0 10px;color:var(--navy)}
.filters h4:first-child{margin-top:0}
.filters label{display:flex;gap:9px;align-items:center;font-size:14px;padding:5px 0;cursor:pointer}
.filters input{accent-color:var(--accent)}
.filters .clear{margin-top:16px;font-size:13px;color:var(--accent);font-weight:700;cursor:pointer;background:none;border:none}
.noresult{display:none;border:1px dashed var(--line);border-radius:12px;padding:44px;text-align:center;color:var(--gray);grid-column:1/-1}
/* product detail */
.pd{display:grid;grid-template-columns:1fr 1.22fr;gap:48px;padding:56px 0 20px}
.pd > div{min-width:0}
.pd .gal-main{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#f6f8fb}
.pd .gal-main img{width:100%;aspect-ratio:1/1;object-fit:contain;background:#fff}
.thumbs{display:grid;grid-template-columns:repeat(6,1fr);gap:10px;margin-top:12px}
.thumbs img{width:100%;border:2px solid var(--line);border-radius:8px;cursor:pointer;aspect-ratio:1;object-fit:contain;padding:2px;background:#fff;transition:.15s}
.thumbs img.cur,.thumbs img:hover{border-color:var(--accent)}
.pd h1{font-size:28px;margin:10px 0 6px}
.pd .sku-line{color:var(--accent);font-weight:700;letter-spacing:1px;font-size:13.5px}
/* 右栏关键参数表：填满 CTA 下方留白，与左栏大图高度齐平（完整规格表仍保留下方） */
.pd .keyspecs{width:100%;border-collapse:collapse;font-size:13.5px;margin:20px 0 22px;border-top:1px solid var(--line)}
.pd .keyspecs th,.pd .keyspecs td{text-align:left;padding:11px 12px;border-bottom:1px solid var(--line)}
.pd .keyspecs th{color:var(--gray);font-weight:600;width:170px;background:var(--alt);white-space:nowrap}
.pd .keyspecs td{color:var(--navy);font-weight:600}
/* 右栏备注沉底：右栏内容不足一栏高时，note 对齐左栏底部，消除底部错位 */
.pd > div:last-child{display:flex;flex-direction:column;align-items:flex-start}
.pd > div:last-child .note{margin-top:auto;padding-top:14px}
.pd > div:last-child > *{width:100%}
.pd .desc{font-size:14.5px;color:#4a5a6e;line-height:1.65;margin:2px 0 14px}
.pd-chips{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:2px 0 16px}
.pd-chip{border:1px solid var(--line);border-radius:9px;padding:10px 5px;display:flex;flex-direction:column;align-items:center;gap:6px;font-size:10.5px;font-weight:700;color:var(--navy);text-align:center;line-height:1.25}
.pd-chip svg{width:20px;height:20px;stroke:var(--accent);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.pd .note{font-size:11.5px;color:#8b99ac;margin-top:12px}
.pd-tabs{position:sticky;top:48px;z-index:40;background:#fff;border-bottom:1px solid var(--line)}
.pd-tabs .wrap{display:flex;gap:26px;overflow-x:auto}
.pd-tabs a{padding:13px 2px;font-size:13px;font-weight:600;color:var(--gray);border-bottom:2px solid transparent;white-space:nowrap}
.pd-tabs a.cur{color:var(--accent);border-color:var(--accent)}
/* 性能：屏幕外区块跳过渲染与图片解码，避免长页面一次性解码全部图片导致内存溢出。
   注意：不可用于含 position:sticky 子元素的容器——content-visibility 会成为新的包含块而使 sticky 失效。 */
/* 注：曾用 content-visibility:auto 跳过屏外渲染，但它在低内存/旧内核下可能引发渲染异常或白屏，
   已移除。内存改由「图片降采样 + 卡片缩略图 + decoding:async」在源头控制，不依赖渲染期技巧。 */
.pd-2col{display:grid;grid-template-columns:1.05fr 1fr;gap:44px;align-items:start}
.kf-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:16px}
.kf-item{display:flex;gap:12px;align-items:flex-start}
.kf-item .ic{width:42px;height:42px;border-radius:50%;background:#fff;border:1.5px solid #cfe2fb;color:var(--accent);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.kf-item .ic svg{width:20px;height:20px;stroke:currentColor;fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.kf-item b{display:block;font-size:13.5px;color:var(--navy);margin-bottom:3px}
.kf-item span{font-size:12px;color:var(--gray);line-height:1.5}
.pd-oem{background:linear-gradient(155deg,#0d2450 0%,#0a1a3a 48%,#123a75 130%);color:#fff;margin-top:6px}
.pd-oem-g{display:grid;grid-template-columns:.85fr 1.05fr .95fr;gap:34px;align-items:center;padding-top:46px;padding-bottom:46px}
.pd-oem img{width:100%;border-radius:10px;filter:drop-shadow(0 18px 30px rgba(0,0,0,.45))}
.pd-oem .eyebrow{color:#5db3f7;font-size:11px;letter-spacing:2px;font-weight:800}
.pd-oem h2{color:#fff;font-size:24px;margin:8px 0 10px}
.pd-oem p{color:#b9c7da;font-size:13px;line-height:1.6;margin-bottom:18px}
.pd-oem-items{display:grid;gap:13px}
.pd-oem-items div{display:flex;gap:11px;align-items:flex-start}
.pd-oem-items .ic{width:34px;height:34px;border-radius:50%;border:1.5px solid rgba(255,255,255,.42);display:flex;align-items:center;justify-content:center;flex-shrink:0;color:#eaf3fd;background:rgba(255,255,255,.08)}
.pd-oem-items .ic svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.pd-oem-items b{display:block;font-size:12.5px;color:#fff;line-height:1.3}
.pd-oem-items span{font-size:11px;color:#9db1c7;line-height:1.4}
.faq-item{border-bottom:1px solid var(--line);padding:15px 0}
.faq-item b{display:block;font-size:14px;color:var(--navy);margin-bottom:6px}
.faq-item p{font-size:13.5px;color:var(--gray);line-height:1.6}
.pd-section{scroll-margin-top:108px}
.pd .sell{margin:20px 0}
.pd .sell li{padding:7px 0 7px 28px;position:relative;font-size:15px}
.pd .sell li::before{content:"✓";position:absolute;left:0;top:6px;width:19px;height:19px;border-radius:50%;background:var(--accent);color:#fff;font-size:11px;display:flex;align-items:center;justify-content:center}
.spec-mini{border:1px solid var(--line);border-radius:12px;overflow:hidden;margin:18px 0 24px;font-size:14px}
.spec-mini div{display:grid;grid-template-columns:170px 1fr}
.spec-mini div+div{border-top:1px solid var(--line)}
.spec-mini dt{background:var(--alt);padding:10px 16px;font-weight:700;color:var(--navy)}
.spec-mini dd{padding:10px 16px}
.pd .ctas{display:flex;gap:14px;flex-wrap:wrap}
.pd-section{padding:34px 0;border-top:1px solid var(--line)}
/* Features 与 Specifications 并排时，压缩表格标签列宽 */
.pd-2col .spec th{width:150px}
.pd-2col .spec th,.pd-2col .spec td{padding:10px 12px;font-size:13.5px}
.pd-2col h2{margin-bottom:14px}
.pd-section h2{font-size:24px;margin-bottom:22px}
.feat-list li{display:flex;gap:14px;padding:12px 0;border-bottom:1px solid var(--line);font-size:15px}
.feat-list li:last-child{border-bottom:none}
.feat-list .n{color:var(--accent);font-weight:800;flex:none;width:34px;font-size:17px}
table.spec{width:100%;border-collapse:collapse;font-size:14.5px}
table.spec th,table.spec td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--line)}
table.spec th{background:var(--alt);color:var(--navy);width:230px;vertical-align:top}
.oem-opts{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.oem-opts div{border:1px solid var(--line);border-radius:12px;padding:20px;font-size:14px}
.oem-opts b{display:block;color:var(--navy);margin-bottom:6px}
/* forms */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-grid .full{grid-column:1/-1}
.field label{display:block;font-size:13px;font-weight:700;color:var(--navy);margin-bottom:6px}
.field label i{color:var(--accent);font-style:normal}
.field input,.field select,.field textarea{width:100%;border:1.5px solid var(--line);border-radius:8px;padding:12px 14px;font-size:15px;font-family:inherit;color:var(--navy);background:#fff}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--accent)}
.field .err{display:none;color:#dc2626;font-size:12.5px;margin-top:5px}
.field.bad input,.field.bad select,.field.bad textarea{border-color:#dc2626}
.field.bad .err{display:block}
.form-ok{display:none;background:#ecfdf5;border:1px solid #6ee7b7;color:#065f46;border-radius:10px;padding:16px 20px;margin-top:18px;font-size:14.5px}
.form-err{display:none;background:#fef2f2;border:1px solid #fecaca;color:#b91c1c;border-radius:10px;padding:14px 18px;margin-top:16px;font-size:14px}
.btn[disabled]{opacity:.6;cursor:progress}
.contact-layout{display:grid;grid-template-columns:5fr 7fr;gap:48px;padding:56px 0 80px}
.cinfo li{display:flex;gap:13px;padding:13px 0;border-bottom:1px solid var(--line);font-size:14.5px}
.cinfo .ico{width:40px;height:40px;flex:none;border-radius:10px;background:var(--alt);display:flex;align-items:center;justify-content:center;font-size:17px}
.cinfo b{display:block;color:var(--navy);font-size:13px;letter-spacing:.8px}
/* faq */
.faq details{border:1px solid var(--line);border-radius:10px;padding:0 22px;margin-bottom:12px;background:#fff}
.faq summary{cursor:pointer;font-weight:700;color:var(--navy);padding:17px 0;list-style:none;position:relative;padding-right:34px}
.faq summary::after{content:"+";position:absolute;right:0;top:14px;color:var(--accent);font-size:20px}
.faq details[open] summary::after{content:"–"}
.faq details p{padding:0 0 18px;font-size:14.5px}
/* misc */
.split2{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center}
.res-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.res-card{border:1px solid var(--line);border-radius:12px;padding:24px;background:#fff;transition:.2s}
.res-card:hover{box-shadow:var(--o,0 16px 40px rgba(20,34,53,.1));transform:translateY(-3px)}
.res-card .tag{display:inline-block;background:var(--alt);color:var(--navy);font-size:11.5px;font-weight:700;letter-spacing:1px;border-radius:4px;padding:3px 9px;margin-bottom:12px}
.res-card b{display:block;color:var(--navy);font-size:16px;margin-bottom:6px}
.res-card p{font-size:13.5px;margin-bottom:12px}
.res-card .ver{font-size:12px;color:#94a3b8;margin-bottom:12px}
.res-card a{color:var(--accent);font-weight:700;font-size:13.5px}
.placeholder-note{background:var(--alt);border:1px dashed #cbd5e1;border-radius:12px;padding:18px 22px;font-size:13.5px;color:#64748b}
/* ---- articles ---- */
.art-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.art-card{border:1px solid var(--line);border-radius:14px;padding:28px;background:#fff;transition:.2s;display:flex;flex-direction:column}
.art-card:hover{box-shadow:0 16px 40px rgba(20,34,53,.1);transform:translateY(-3px)}
.art-card .tag{display:inline-block;align-self:flex-start;background:#e8f0fe;color:var(--accent);font-size:11px;font-weight:800;letter-spacing:1px;border-radius:4px;padding:3px 9px;margin-bottom:14px}
.art-card h3{font-size:20px;line-height:1.35;margin-bottom:10px}
.art-card h3 a{color:var(--navy);text-decoration:none}
.art-card h3 a:hover{color:var(--accent)}
.art-card p{font-size:14px;color:var(--gray2,#475569);margin-bottom:14px}
.art-meta{font-size:12.5px;color:#94a3b8;margin-bottom:14px}
.art-grid .more{margin-top:auto}
.art-wrap{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:44px;align-items:start}
.art-wrap>img{grid-column:1/-1;width:100%;max-height:380px;object-fit:contain;background:var(--alt);border-radius:14px;padding:14px}
.art-body{min-width:0}
.art-body .lede{font-size:18px;line-height:1.7;color:var(--navy);font-weight:500;margin-bottom:22px}
.art-body p{font-size:15.5px;line-height:1.8;margin-bottom:18px;color:#334155}
.art-body h2{font-size:23px;line-height:1.35;margin:36px 0 14px;color:var(--navy);scroll-margin-top:90px}
.art-body ul,.art-body ol{margin:0 0 20px 22px}
.art-body li{font-size:15.5px;line-height:1.75;margin-bottom:9px;color:#334155}
.art-body b{color:var(--navy)}
.art-body a{color:var(--accent);font-weight:600}
.tbl{width:100%;border-collapse:collapse;margin:0 0 22px;font-size:14px}
.tbl th,.tbl td{border:1px solid var(--line);padding:11px 14px;text-align:left;vertical-align:top}
.tbl thead th{background:var(--alt);color:var(--navy);font-size:13px;font-weight:700}
.tbl tbody tr:nth-child(even){background:#fbfcfe}
.art-toc{background:var(--alt);border:1px solid var(--line);border-radius:12px;padding:20px 24px;margin-bottom:28px}
.art-toc b{display:block;color:var(--navy);font-size:14px;margin-bottom:10px}
.art-toc ul{list-style:none;margin:0;display:grid;grid-template-columns:repeat(2,1fr);gap:4px 20px}
.art-toc li{margin:0}
.art-toc a{color:#475569;font-size:14px;text-decoration:none}
.art-toc a:hover{color:var(--accent)}
.art-byline{display:flex;gap:10px;flex-wrap:wrap;font-size:13.5px;color:#94a3b8;margin-top:12px}
.art-faq{margin-top:44px;border-top:1px solid var(--line);padding-top:28px}
.art-faq h2{font-size:23px;color:var(--navy);margin-bottom:18px}
.faq{border:1px solid var(--line);border-radius:10px;padding:16px 20px;margin-bottom:12px;background:#fff}
.faq summary{cursor:pointer;font-weight:700;color:var(--navy);font-size:15.5px;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-a{font-size:15px;line-height:1.75;color:#334155;margin-top:12px;padding-top:12px;border-top:1px solid var(--line)}
.art-side{position:sticky;top:88px;display:flex;flex-direction:column;gap:18px}
.side-cta{background:var(--navy);border-radius:14px;padding:26px;color:#fff}
.side-cta b{display:block;font-size:17px;margin-bottom:10px}
.side-cta p{font-size:13.5px;color:#c7d2e0;line-height:1.65;margin-bottom:16px}
.side-cta .btn{display:block;text-align:center;margin-bottom:10px;width:100%;box-sizing:border-box}
.side-box{border:1px solid var(--line);border-radius:12px;padding:20px 22px;background:#fff}
.side-box b{display:block;color:var(--navy);font-size:14px;margin-bottom:12px}
.side-box ul{list-style:none;margin:0}
.side-box li{margin-bottom:9px;font-size:14px;line-height:1.5}
.side-box a{color:#475569;text-decoration:none}
.side-box a:hover{color:var(--accent)}
/* ---- calculator tool ---- */
.calc-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:30px;align-items:start}
.calc-panel{border:1px solid var(--line);border-radius:14px;padding:26px 28px;background:#fff}
.calc-out-panel{position:sticky;top:88px;background:var(--alt)}
.calc-h{font-size:13px;font-weight:800;letter-spacing:.6px;text-transform:uppercase;color:var(--accent);margin:22px 0 12px}
.calc-h:first-child{margin-top:0}
.calc-row{display:grid;grid-template-columns:1fr 130px;gap:14px;align-items:center;margin-bottom:10px}
.calc-row label{font-size:14px;color:#475569}
.calc-row input,.calc-row select{width:100%;padding:9px 11px;border:1px solid var(--line);border-radius:8px;font-size:14px;font-family:inherit;background:#fff;color:var(--navy);box-sizing:border-box}
.calc-row input:focus,.calc-row select:focus{outline:2px solid rgba(11,108,240,.28);border-color:var(--accent)}
.calc-list{list-style:none;margin:0 0 6px}
.calc-list li{display:flex;justify-content:space-between;gap:16px;padding:9px 0;border-bottom:1px dashed var(--line);font-size:14.5px}
.calc-list li span{color:#475569}
.calc-list li b{color:var(--navy);font-variant-numeric:tabular-nums}
.calc-list li.tot{border-bottom:none;border-top:2px solid var(--navy);margin-top:6px;padding-top:12px}
.calc-list li.tot b{font-size:18px}
.calc-list li.big b{font-size:21px}
.calc-list li .calc-out.good{color:#15803d}
.calc-list li .calc-out.warn{color:#b45309}
.calc-list li .calc-out.bad{color:#b91c1c}
.calc-cta{margin-top:24px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px}
.calc-cta b{display:block;color:var(--navy);font-size:15.5px;margin-bottom:8px}
.calc-cta p{font-size:13.5px;line-height:1.65;color:#475569;margin-bottom:14px}
.calc-notes{margin-top:44px;border-top:1px solid var(--line);padding-top:30px;max-width:860px}
.calc-notes h2{font-size:22px;color:var(--navy);margin-bottom:14px}
.calc-notes ol{margin:0 0 18px 22px}
.calc-notes li{font-size:15px;line-height:1.75;color:#334155;margin-bottom:10px}
.calc-notes b{color:var(--navy)}
.calc-disc{font-size:13.5px;line-height:1.7;color:#64748b;background:var(--alt);border-left:3px solid var(--accent);border-radius:0 8px 8px 0;padding:14px 18px}
.tool-card{border:2px solid var(--accent);border-radius:14px;padding:28px;background:#fff;display:flex;gap:24px;align-items:center;flex-wrap:wrap}
.tool-card .tc-b{flex:1;min-width:280px}
.tool-card .tc-b b{display:block;font-size:20px;color:var(--navy);margin-bottom:8px}
.tool-card .tc-b p{font-size:14px;margin-bottom:0}
/* responsive */
@media(max-width:1080px){
 .prod-grid{grid-template-columns:repeat(3,1fr)}
 .oem-opts,.res-grid{grid-template-columns:repeat(2,1fr)}
 .art-grid{grid-template-columns:1fr}
 .art-wrap{grid-template-columns:1fr;gap:28px}
 .art-toc ul{grid-template-columns:1fr}
 .art-side{position:static}
 .calc-grid{grid-template-columns:1fr}
 .calc-out-panel{position:static}
 .steps{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:860px){
 nav.main{display:none;position:absolute;top:80px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;padding:10px 20px 20px;gap:0;box-shadow:0 20px 40px rgba(20,34,53,.12)}
 nav.main.open{display:flex}
 nav.main>a,nav.main .dd>a{padding:13px 0;width:100%}
 nav.main .dd-menu{position:static;display:block;box-shadow:none;border:none;padding:0 0 6px 16px}
 .burger{display:flex}
 .hero .wrap,.why .grid,.oem-band .wrap,.split2,.contact-layout,.pd{grid-template-columns:1fr}
 .hero h1{font-size:31px}
 .hero-visual{order:-1}
 .stats .wrap{grid-template-columns:repeat(2,1fr)}
 .cat-grid{grid-template-columns:repeat(2,1fr)}
 .prod-grid{grid-template-columns:repeat(2,1fr)}
 .cat-layout{grid-template-columns:1fr}
 .filters{position:static}
 .fac-grid{grid-template-columns:1fr}
 .steps{grid-template-columns:repeat(2,1fr)}
 footer.site .grid{grid-template-columns:1fr 1fr}
 .form-grid{grid-template-columns:1fr}
}
@media(max-width:520px){
 .cat-grid,.prod-grid,.steps,footer.site .grid,.oem-opts,.res-grid,.art-grid{grid-template-columns:1fr}
 .sec{padding:52px 0}
 .banner h1{font-size:26px}
 .pd h1{font-size:23px}
 .thumbs{grid-template-columns:repeat(4,1fr)}
 .art-body h2{font-size:20px}
 .tbl{font-size:12.5px}
 .tbl th,.tbl td{padding:8px 10px}
}
/* ---- logo & platform branding ---- */
a.logo .logosvg{height:46px;width:auto;display:block}
.topbar .wrap{gap:10px}
.plat-strip{background:var(--navy);padding:30px 0;border-bottom:4px solid var(--accent)}
.plat-strip .wrap{display:flex;align-items:center;justify-content:space-between;gap:26px;flex-wrap:wrap}
.plat-strip .lbl{color:#fff;font-weight:800;font-size:15px;line-height:1.4;max-width:280px}
.plat-strip .lbl small{display:block;color:#9db1c7;font-weight:500;font-size:12.5px;letter-spacing:.4px}
.plat-row{display:flex;gap:26px;flex-wrap:wrap}
.plat{display:flex;flex-direction:column;align-items:center;gap:7px;color:#c8d4e2;font-size:10.5px;letter-spacing:2px;font-weight:800}
.plat svg{width:42px;height:42px;stroke:#fff;fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;opacity:.92}
.plat:hover svg{stroke:var(--accent)}
.pchips{display:flex;gap:6px;flex-wrap:wrap;margin-top:7px}
.pchip{font-size:10.5px;font-weight:800;border:1.5px solid var(--line);border-radius:4px;padding:1px 8px;color:var(--navy);letter-spacing:.6px;background:#fff}
.pchip.hot{border-color:var(--accent);color:var(--accent)}
.hero-art{position:absolute;right:-40px;bottom:-30px;width:420px;opacity:.10;pointer-events:none}
.hero-art svg{width:100%;stroke:#fff;fill:none;stroke-width:1.4;stroke-linecap:round;stroke-linejoin:round}
footer.site .tm-line{border-top:1px solid rgba(255,255,255,.14);margin-top:14px;padding-top:14px;display:flex;gap:10px;flex-wrap:wrap;align-items:center;font-size:12px;color:#9db1c7}
footer.site .tm-line .pchip{background:transparent;border-color:rgba(255,255,255,.3);color:#c8d4e2}
/* custom file upload (避免浏览器原生控件出现系统语言文字) */
.filebox{position:relative;display:flex;align-items:center;gap:12px;border:1.5px solid var(--line);border-radius:8px;padding:9px 14px;background:#fff}
.filebox input[type=file]{position:absolute;inset:0;opacity:0;cursor:pointer;width:100%;height:100%}
.filebtn{background:var(--navy);color:#fff;border:none;border-radius:6px;padding:8px 16px;font-weight:800;font-size:12px;letter-spacing:.8px;cursor:pointer;pointer-events:none}
.fname{font-size:13.5px;color:var(--gray);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.filebox.hasfile{border-color:var(--accent)}
.filebox.hasfile .fname{color:var(--navy);font-weight:700}
/* ===== v2 designer redesign（STEPCOOL网站设计提案 + 设计师首页稿） ===== */
body{font-family:Inter,"Segoe UI",Arial,"Helvetica Neue",sans-serif}
header.site .wrap{height:74px}
nav.main{gap:26px;font-size:14.5px;letter-spacing:0}
nav.main>a,nav.main .dd>a{padding:24px 0;text-transform:none}
nav.main .cv{font-size:10px;color:#8291a5}
.navcta{gap:10px}
.navcta .btn{padding:10px 22px;border-radius:12px;text-transform:none;font-size:13.5px;letter-spacing:0}
.navcta .ico{width:30px;height:30px;display:inline-flex;align-items:center;justify-content:center;border-radius:8px;color:var(--navy)}
.navcta .ico:hover{background:var(--alt);color:var(--accent)}
.navcta .ico svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.navcta .lang{font-size:12px;font-weight:600;color:var(--navy)}
/* hero（场景大图） */
.hero-bg{position:relative;min-height:400px;display:flex;align-items:center;color:#fff;background-color:#0a1526;background-size:cover;background-position:center}
.hero-bg::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(6,13,26,.55) 0%,rgba(6,13,26,.28) 40%,rgba(6,13,26,0) 62%)}
.hero-bg .wrap{position:relative;z-index:1;width:100%;padding-top:34px;padding-bottom:34px}
.hero-bg .eyebrow{color:#5db3f7;letter-spacing:6px;font-size:13.5px;font-weight:600}
.hero-bg h1{color:#fff;font-size:55px;line-height:1.12;margin-bottom:16px;font-weight:800;letter-spacing:-.5px}
.hero-bg h1 em{font-style:normal;background:linear-gradient(90deg,#0075f5,#1fa6f9);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:#0b82f7}
.hero-bg .lead{color:#e8eef7;font-size:15.5px;max-width:430px;margin-bottom:28px;line-height:1.6}
.hero-bg .ctas{display:flex;gap:14px;flex-wrap:wrap}
.hero-bg .btn{text-transform:none;letter-spacing:.2px}
.hero-bg .btn-outline{border:1.5px solid rgba(255,255,255,.65);color:#fff;background:transparent}
/* 分类图卡（整卡为设计稿原图，文字已烤入图内） */
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:34px}
.sec-head .viewall{color:var(--accent);font-weight:700;font-size:14px;white-space:nowrap}
.sec-head .viewall:hover{text-decoration:underline}
.cat-tiles{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
.cat-tile{position:relative;display:block;border-radius:10px;overflow:hidden;aspect-ratio:270/148;box-shadow:0 8px 22px rgba(14,30,56,.12);transition:.25s}
.cat-tile img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:.4s}
.cat-tile:hover{transform:translateY(-4px);box-shadow:0 16px 36px rgba(14,30,56,.2)}
.cat-tile:hover img{transform:scale(1.05)}
/* 特性条 */
.feat{display:flex;align-items:center;gap:13px;justify-content:center}
.feat .ic{width:46px;height:46px;border-radius:50%;background:#fff;border:1.5px solid #cfe2fb;color:var(--accent);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.feat .ic svg{width:24px;height:24px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.feat b{display:block;color:var(--navy);font-size:14.5px;line-height:1.3}
.feat span{font-size:12px;color:var(--gray)}
/* Popular Picks + OEM 卡 */
.picks{display:grid;grid-template-columns:1fr 600px;gap:22px;align-items:start}
.picks-left .sec-head{margin-bottom:24px}
.picks-left .sec-h2{font-size:26px}
.picks-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:9px}
.pick-card{background:#fff;border-radius:8px;overflow:hidden;transition:.2s;display:flex;flex-direction:column}
.pick-card:hover{box-shadow:0 12px 30px rgba(14,30,56,.13);transform:translateY(-3px)}
.pick-card .ph{background:#fff;aspect-ratio:110/82;overflow:hidden;display:block}
.pick-card .ph img{width:100%;height:100%;object-fit:contain;padding:6px;transition:.3s}
.pick-card:hover .ph img{transform:scale(1.04)}
.pick-card .bd{padding:10px 2px 6px}
.pick-card h3{font-size:11.5px;line-height:1.3;margin-bottom:4px;color:var(--navy);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pick-card .sku{font-size:10px;color:#8291a5;letter-spacing:.3px;font-weight:600}
.pick-card .plat{font-size:10px;color:#8b99ac;margin:3px 0 7px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;letter-spacing:.2px;font-weight:500}
.pick-card .more{font-size:11px;font-weight:700;color:var(--accent);white-space:nowrap}
.pick-card .more:hover{text-decoration:underline}
.oem-card{border-radius:12px;background:linear-gradient(155deg,#0d2450 0%,#0a1a3a 48%,#123a75 130%);color:#fff;padding:34px 30px 30px;position:relative;overflow:hidden;display:grid;grid-template-columns:1fr 1.35fr;gap:26px;align-items:center}
.oem-card::before{content:"";position:absolute;inset:0;background:linear-gradient(115deg,transparent 55%,rgba(64,140,240,.16) 66%,transparent 74%,rgba(64,140,240,.12) 84%,transparent 92%);pointer-events:none}
.oem-card .wm{position:absolute;left:10%;bottom:-6px;width:42%;max-width:260px;opacity:.95;pointer-events:none;-webkit-mask-image:radial-gradient(ellipse 65% 65% at 50% 55%,#000 48%,transparent 76%);mask-image:radial-gradient(ellipse 65% 65% at 50% 55%,#000 48%,transparent 76%)}
.oem-card>*{position:relative}
.oem-card .eyebrow{color:#5db3f7;font-size:11px;display:block;margin-bottom:10px}
.oem-card h3{color:#fff;font-size:15.5px;line-height:1.3;margin-bottom:10px;white-space:nowrap}
.oem-card .oc-l>p{color:#b9c7da;font-size:12.5px;margin-bottom:18px;line-height:1.6}
.oem-card .btn{align-self:flex-start;font-size:12.5px;padding:11px 24px;border-radius:999px}
.oem-card .steps{margin:0;padding:0;display:grid;grid-template-columns:1fr;gap:16px;counter-reset:none}
.oem-card .step{display:flex;gap:9px;align-items:flex-start;position:relative;background:transparent;border:none;padding:0;border-radius:0}
.oem-card .step::before{content:"";position:absolute;left:15px;top:34px;height:calc(100% - 24px);width:1.5px;background:rgba(93,163,247,.35)}
.oem-card .step:last-child::before{display:none}
.oem-card .step b{color:#fff}
.oem-card .step .num{width:30px;height:30px;border-radius:50%;background:var(--accent);color:#fff;font-size:11px;font-weight:800;display:flex;align-items:center;justify-content:center;flex-shrink:0;box-shadow:0 4px 14px rgba(5,119,248,.45);margin:0}
.oem-card .step .sic{width:32px;height:32px;color:#eaf3fd;flex-shrink:0;margin-top:0;display:flex;align-items:center;justify-content:center;border:1.5px solid rgba(255,255,255,.42);border-radius:50%;background:rgba(255,255,255,.08)}
.oem-card .step .sic svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.oem-card .step b{display:block;font-size:12px;color:#fff;line-height:1.3;white-space:nowrap}
.oem-card .step span{font-size:10px;color:#a9bcd2;line-height:1.5;display:block;white-space:nowrap}
/* 四栏信任带 */
.quad{background:var(--alt);border-top:1px solid var(--line)}
.quad .wrap{display:block;padding-top:56px;padding-bottom:56px}
/* WHY STEPCOOL —— 独立整行模块 */
.quad-why{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,2.15fr);gap:36px;align-items:center;padding-bottom:34px;margin-bottom:38px;border-bottom:1px solid var(--line)}
.quad-why .qlead{margin-bottom:0;max-width:300px}
.quad-why .why-minis{gap:26px;margin-top:0}
/* 下方三栏 */
.quad-row{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1.35fr) minmax(0,1fr);gap:34px;align-items:start}
.quad .qh{font-size:13px;letter-spacing:1.8px;text-transform:uppercase;color:var(--accent);margin-bottom:14px;font-weight:800}
.quad .qh.big{font-size:18px;letter-spacing:.2px;text-transform:none;color:var(--navy);margin-bottom:14px;font-weight:800}
.quad .qh .hl{color:var(--accent)}
.quad .qlead{font-size:12.5px;color:var(--gray);margin-bottom:18px;max-width:260px;line-height:1.55}
.quad .why-minis{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}
.quad .mini{display:flex;align-items:center;gap:12px;padding:0;margin-bottom:0}
.quad .mini+.mini{border-left:1px solid var(--line);padding-left:20px}
.quad .mini .ic,.quad .fitem .ic{width:40px;height:40px;border-radius:50%;background:#fff;border:1.5px solid #cfe2fb;color:var(--accent);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.quad .mini .ic svg,.quad .fitem .ic svg{width:20px;height:20px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.quad .mini .mtx{display:block}
.quad .mini b{font-size:13.5px;color:var(--navy);display:block;line-height:1.3}
.quad .mini span{font-size:12px;color:#5b9fe0;line-height:1.45;display:block;margin-top:2px}
.quad .ab p{font-size:12.5px;margin-bottom:10px;color:#4a5a6e;line-height:1.6}
.quad .ab .learn{margin-top:6px;font-size:13px;padding:10px 24px;border-radius:999px}
.quad .stats4{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px 14px;margin-top:20px}
.quad .stats4>div{border-left:1px solid var(--line);padding-left:10px}
.quad .stats4 b{font-size:19px;color:var(--accent);display:block;line-height:1.2;font-weight:800}
.quad .stats4 span{font-size:9.5px;color:var(--gray);line-height:1.3;display:block;margin-top:2px}
.quad .fph{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:7px;margin-bottom:12px}
.quad .fph img{aspect-ratio:526/408;object-fit:cover;width:100%;height:auto;display:block;border-radius:5px}
.quad .flabels{display:grid;gap:0;margin-top:2px}
.quad .fitem{display:flex;gap:9px;align-items:center;padding:7px 0;border-top:1px solid var(--line)}
.quad .fitem:first-child{border-top:none;padding-top:2px}
.quad .fitem .ic{width:32px;height:32px}
.quad .fitem .ic svg{width:16px;height:16px}
.quad .fitem b{font-size:10.5px;color:var(--navy);display:block;line-height:1.3}
.quad .fitem span{font-size:9.5px;color:var(--gray);line-height:1.35}
/* 工厂实景区（首页 + About） */
.fgrid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:26px}
.fcell{position:relative;border-radius:12px;overflow:hidden;background:#e8eef5}
.fcell img{width:100%;aspect-ratio:4/3;object-fit:cover;display:block;transition:transform .35s}
.fcell:hover img{transform:scale(1.04)}
.fcell .fcap{position:absolute;left:0;right:0;bottom:0;padding:26px 13px 10px;background:linear-gradient(transparent,rgba(10,25,47,.72));color:#fff;font-size:13px;font-weight:700;letter-spacing:.2px}
.fcell .fcap span{display:block;font-weight:400;font-size:11px;opacity:.85;margin-top:1px}
@media (max-width:860px){.fgrid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:520px){.fgrid{grid-template-columns:1fr}}
.quad .certs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.quad .cert{text-align:center}
.quad .cert .cimg{display:block;background:#fff;border:1px solid var(--line);border-radius:8px;overflow:hidden;transition:.2s}
.quad .cert .cimg:hover{box-shadow:0 8px 20px rgba(14,30,56,.12)}
.quad .cert .cimg img{width:100%;display:block}
.quad .cert .clink{display:inline-block;margin-top:8px;font-size:9.5px;font-weight:700;color:var(--accent);line-height:1.3}
.quad .cert .clink:hover{text-decoration:underline}
/* 页脚补充 */
footer.site .brand p{color:#8fa1b8;font-size:12.5px;margin-top:12px;letter-spacing:.3px}
footer.site .brand .logo img{display:block}
footer.site .cico{width:22px;height:22px;flex-shrink:0;color:#5db3f7;margin-top:1px}
footer.site .cico svg{width:100%;height:100%;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
footer.site .fright{display:flex;flex-direction:column;align-items:flex-end;gap:14px}
footer.site .git .sq{margin:0;font-size:13px;padding:10px 22px;border-radius:999px;white-space:nowrap}
footer.site .soc{display:flex;gap:9px}
footer.site .soc a{width:30px;height:30px;border-radius:50%;border:1px solid rgba(255,255,255,.28);display:flex;align-items:center;justify-content:center}
footer.site .soc a:hover{background:var(--accent);border-color:var(--accent)}
footer.site .soc svg{width:14px;height:14px;fill:#c8d4e2}
@media(min-width:861px){footer.site .grid{grid-template-columns:1.4fr 1fr 1fr 1fr 1.35fr .95fr;gap:30px}}

/* 产品详情页响应式 */
@media(max-width:1100px){
 .pd{grid-template-columns:1fr;gap:30px}
 .pd-2col{grid-template-columns:1fr;gap:26px}
 .pd-oem-g{grid-template-columns:1fr;gap:26px}
 .pd-oem img{max-width:420px}
}
@media(max-width:640px){
 .kf-grid{grid-template-columns:1fr}
 .pd-chips{grid-template-columns:repeat(2,1fr)}
 .gal{grid-template-columns:1fr}
 .thumbs-v{flex-direction:row;max-height:none;overflow-x:auto}
 .thumbs-v img{width:64px;flex-shrink:0}
}
/* 响应式补充 */
@media(max-width:1100px){.cat-tiles{grid-template-columns:repeat(3,1fr)}.quad-why{grid-template-columns:1fr;gap:22px;align-items:flex-start}.quad .why-minis{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.quad-row{grid-template-columns:1fr 1fr}.picks{grid-template-columns:1fr}.picks-grid{grid-template-columns:repeat(3,1fr);gap:14px}.oem-card{grid-template-columns:1fr}.picks-left .sec-h2{font-size:24px}}
@media(max-width:1024px){.oem-card .wm{opacity:.5}}
@media(max-width:900px){.hero-bg h1{font-size:40px}.hero-bg{min-height:400px}}
@media(max-width:860px){.navcta .ico,.navcta .lang{display:none}}
@media(max-width:640px){.cat-tiles{grid-template-columns:repeat(2,1fr)}.picks-grid{grid-template-columns:repeat(2,1fr)}.quad .stats4{grid-template-columns:1fr 1fr;gap:12px}.quad .fph{grid-template-columns:1fr 1fr}.quad .flabels{grid-template-columns:1fr}.quad .certs{grid-template-columns:repeat(3,1fr)}}
@media(max-width:480px){.picks-grid{grid-template-columns:1fr}.quad-row{grid-template-columns:1fr;gap:30px}.quad .why-minis{grid-template-columns:1fr}.quad .mini+.mini{border-left:none;padding-left:0}}
/* ---- mobile hardening（390px 真机视口实测问题修复） ---- */
@media(max-width:860px){
  header.site .wrap{height:58px}
  a.logo .logosvg{height:32px}
  /* v2 改版的全局 nav.main{gap:26px} / >a{padding:24px 0} 会盖掉下面的响应式菜单样式，
     必须在这里重新压回紧凑值，否则移动端菜单被撑成超长稀疏列表 */
  nav.main{top:58px;gap:0}
  nav.main>a,nav.main .dd>a{padding:13px 0}
  .navcta{gap:6px}
  .navcta .btn{height:34px;padding:0 10px;font-size:12px;border-radius:9px;line-height:1;box-sizing:border-box;align-self:center;white-space:nowrap}
  .burger{padding:11px 8px;margin-right:-8px}
  nav.main .dd-menu a{padding:13px 20px}
  /* iOS Safari：输入框字号小于 16px 时聚焦会自动放大整页 */
  .field input,.field select,.field textarea,.calc-row input,.calc-row select{font-size:16px}
}
/* 窄屏可读性与点按目标（审计实测：最小字号 9.5px、最小点按高度 12px） */
@media(max-width:640px){
  /* logo 原宽 217px（占 390px 视口的 56%），收紧以给 CTA 留出空间并保持左右边距对称 */
  a.logo .logoimg{height:17px}
  .viewall,.sec-head .viewall{padding:7px 0}
  .art-toc a{display:block;padding:5px 0}
  .filters .clear{padding:9px 0;font-size:14px}
  .filters input[type=checkbox]{font-size:16px}
  .side-box ul a,.cinfo a{display:inline-block;padding:5px 0}
  .crumbs{padding:5px 0;font-size:13.5px;line-height:1.6}
  .crumbs a,.pd-crumbs a{display:inline-block;padding:4px 0}
  footer.site a{display:inline-block;padding:6px 0}
  .pick-card h3{font-size:13px}
  .pick-card .sku,.pick-card .plat{font-size:11.5px}
  .pick-card .more{font-size:12.5px;padding:7px 0}
  .pchip{font-size:11.5px;padding:2px 9px}
  .quad .stats4 span{font-size:12px}
  .quad .fitem b{font-size:12.5px}
  .quad .fitem span{font-size:12px}
  .quad .cert .clink{font-size:12px;padding:5px 0}
  .fcell .fcap{font-size:13.5px}
  .fcell .fcap span{font-size:12px}
  .pd .note{font-size:12.5px}
  .pcard .sku{font-size:12.5px}
}
@media(max-width:340px){.navcta .btn{display:none}}
@media(max-width:520px){
  .pd .keyspecs th{width:auto;white-space:normal}
  .pd .keyspecs th,.pd .keyspecs td{padding:9px 10px}
  .tbl{font-size:13px}
  /* 产品页缩略图把 4 列网格撑破，造成 18px 横向滚动（实测 docScrollW 408 vs 390） */
  .thumbs{grid-template-columns:repeat(4,minmax(0,1fr))}
}
html{overflow-x:clip}
.hero-bg{overflow:hidden}

/* ================= v16 · 紧凑改版（顶部联系条 / 产品列表 / 详情页 / 首页压缩） ================= */
/* 顶部联系条 */
.topbar{background:#0b1a33;color:#a9b8cc;font-size:12.5px;padding:7px 0;line-height:1.2;border-bottom:1px solid rgba(255,255,255,.06)}
.topbar .wrap{display:flex;align-items:center;justify-content:space-between;gap:18px}
.tb-l{display:flex;align-items:center;gap:22px;flex-wrap:wrap}
.tb-l a{display:inline-flex;align-items:center;gap:7px;color:#cfdbea;font-weight:600;letter-spacing:.2px}
.tb-l a:hover{color:#fff}
.tb-l svg{width:13px;height:13px;stroke:#4f9cf7;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;flex:none}
.tb-l .tb-wa svg{stroke:none;width:14px;height:14px}
.tb-r{color:#93a6bd;font-weight:500;white-space:nowrap;font-size:12px;letter-spacing:.1px}
.tb-r b{color:#fff;font-weight:700}
/* 首屏与全站节奏压缩 */
.sec{padding:48px 0}
.sec-head{margin-bottom:22px}
.sec-h2{font-size:28px;margin-bottom:6px}
.hero-bg{min-height:340px}
.hero-bg .wrap{padding-top:26px;padding-bottom:26px}
.hero-bg h1{font-size:46px;margin-bottom:12px}
.hero-bg .lead{font-size:14.5px;margin-bottom:20px;max-width:420px}
.hero-bg .eyebrow{font-size:12px;letter-spacing:4px;margin-bottom:8px}
.quad .wrap{padding-top:40px;padding-bottom:40px}
.quad-why{padding-bottom:24px;margin-bottom:26px}
.banner{padding:34px 0 30px}
.banner h1{font-size:30px}
/* 信任条（hero 下方一行） */
.trustbar{background:#fff;border-bottom:1px solid var(--line)}
.trustbar .wrap{display:flex;align-items:center;gap:26px;flex-wrap:wrap;min-height:50px;padding-top:9px;padding-bottom:9px}
.trustbar .tl{font-size:10.5px;font-weight:800;letter-spacing:1.6px;text-transform:uppercase;color:#94a3b8;padding-right:22px;border-right:1px solid var(--line)}
.trustbar .ti{display:inline-flex;align-items:center;gap:7px;font-size:12.5px;font-weight:600;color:var(--navy)}
.trustbar .ti svg{width:15px;height:15px;stroke:var(--accent);fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
/* 列表 / 分类页页头 */
.phead{background:linear-gradient(115deg,var(--navy),var(--navy2));color:#fff;padding:26px 0 24px}
.phead .crumbs{color:#8fa4bf;font-size:12.5px;margin-bottom:9px}
.phead .crumbs a{color:#b9c9dd}
.phead .crumbs a:hover{color:#fff}
.phead h1{color:#fff;font-size:29px;line-height:1.22;margin-bottom:7px;max-width:980px}
.phead .psub{color:#a7bcd4;font-size:13.5px;max-width:900px;line-height:1.55}
.pbadges{display:flex;gap:9px;flex-wrap:wrap;margin-top:13px}
.pbadges span{border:1px solid rgba(255,255,255,.18);background:rgba(255,255,255,.05);border-radius:6px;padding:4px 10px 4px 23px;font-size:11.5px;font-weight:600;color:#d7e3f2;position:relative}
.pbadges span::before{content:"✓";position:absolute;left:9px;top:4px;color:#3fbf7f;font-weight:800}
/* 分类筛选条 + 紧凑网格 */
.pshop{padding:0 0 56px}
.pbar{position:sticky;top:74px;z-index:30;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:14px;padding:9px 0;margin-bottom:18px}
.pchips-nav{display:flex;gap:8px;overflow-x:auto;scrollbar-width:none}
.pchips-nav::-webkit-scrollbar{display:none}
.pchips-nav a{white-space:nowrap;border:1.5px solid var(--line);border-radius:999px;padding:6px 14px;font-size:12.5px;font-weight:700;color:var(--navy);cursor:pointer;line-height:1.35}
.pchips-nav a:hover{border-color:#b9d4f8;color:var(--accent)}
.pchips-nav a.on{background:var(--accent);border-color:var(--accent);color:#fff}
.pcount{font-size:12.5px;color:#8291a5;white-space:nowrap}
.pcount b{color:var(--navy)}
.pgrid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
/* 卡片压缩：去掉长卖点，只留型号 / 名称 / 类目 / 详情 */
.pcard{border-radius:10px}
.pcard .ph{aspect-ratio:1/1;background:#f8fafc;border-bottom:1px solid #f1f5f9}
.pcard .ph img{padding:12px}
.pcard .bd{padding:11px 13px 13px;gap:5px}
.pcard .sku{font-size:10.5px;letter-spacing:.8px}
.pcard h3{font-size:13px;line-height:1.42;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:37px}
.pcard ul,.pcard .meta{display:none}
.pcard .pchips{display:flex;gap:5px;margin-top:2px}
.pcard .pchip{font-size:9.5px;padding:0 6px;border-radius:3px;line-height:1.7}
.pcard .more{padding-top:5px;font-size:10.5px;letter-spacing:.5px;color:var(--accent);font-weight:800}
.pcard:hover{transform:translateY(-3px);box-shadow:0 12px 26px rgba(14,30,56,.10)}
/* 详情页收紧 */
.pd{padding:26px 0 6px;gap:38px}
.pd-title{font-size:23px;line-height:1.3;margin:8px 0 2px}
.pd .sell{margin:12px 0}
.pd .sell li{padding:5px 0 5px 26px;font-size:14px}
.pd .sell li::before{top:5px;width:18px;height:18px;font-size:10.5px}
.pd .keyspecs{margin:14px 0 16px}
.pd .ctas{gap:10px}
.pd-section{padding:26px 0}
.pd-section h2{font-size:20px;margin-bottom:16px}
.pd-tabs{top:74px}
.feat-list li{padding:9px 0;font-size:14px}
/* v16 响应式 */
@media(max-width:1100px){
  .pgrid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .phead h1{font-size:25px}
}
@media(max-width:860px){
  .topbar{padding:6px 0}
  .topbar .wrap{flex-wrap:wrap;gap:3px 14px;justify-content:flex-start}
  .tb-l{gap:14px;font-size:11.5px}
  .tb-r{font-size:11px;white-space:normal;order:3;width:100%}
  .pbar{top:58px;padding:8px 0}
  .pgrid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .hero-bg{min-height:300px}
  .hero-bg h1{font-size:34px}
  .sec{padding:38px 0}
  .trustbar .wrap{gap:12px 18px;min-height:0;padding-top:10px;padding-bottom:10px}
  .trustbar .tl{display:none}
  .trustbar .ti{font-size:11.5px}
  .pd-tabs{top:58px}
}
@media(max-width:640px){
  .tb-l a:nth-child(2){display:none}
  .phead{padding:20px 0}
  .phead h1{font-size:21px}
  .phead .psub{font-size:12.5px}
  .pbadges span{font-size:10.5px;padding:3px 8px 3px 21px}
  .pbadges span::before{left:8px;top:3px}
  .pgrid{gap:10px}
  .pcard h3{font-size:12px;min-height:34px}
  .pcard .bd{padding:9px 10px 11px}
  .pcard .more{font-size:10px}
  .pshop{padding-bottom:38px}
}