/* 0271828 工业品产品目录 · 纯手写 CSS，无第三方框架 */
*{margin:0;padding:0;box-sizing:border-box}
:root{
    --navy:#0b2545;--navy2:#13315c;--blue:#1d5aa8;
    --orange:#f97316;--orange-d:#ea580c;
    --bg:#f1f4f8;--card:#fff;--line:#e3e8ef;
    --text:#1e293b;--muted:#64748b;
}
html{-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);font-size:15px;line-height:1.7}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.wrap{max-width:1200px;margin:0 auto;padding:0 16px}

/* 顶栏 */
.topbar{background:var(--navy);color:#b9c6da;font-size:12.5px}
.topbar-in{display:flex;justify-content:space-between;align-items:center;height:34px}
.tb-r{color:#8fa3c2}

/* 页眉 */
.site-hd{background:#fff;border-bottom:1px solid var(--line)}
.hd-in{display:flex;align-items:center;gap:18px;padding:18px 16px}
.logo{display:flex;align-items:baseline;gap:10px}
.logo b{font-size:30px;color:var(--navy);letter-spacing:1px}
.logo b::after{content:"";display:inline-block;width:8px;height:8px;background:var(--orange);margin-left:4px;border-radius:2px}
.logo span{font-size:14px;color:var(--muted);border-left:2px solid var(--orange);padding-left:10px}
.hd-tag{margin-left:auto;font-size:13px;color:var(--muted);background:#fff7ed;border:1px solid #fed7aa;color:#c2410c;padding:6px 14px;border-radius:20px}

/* 主导航 */
.mainnav{background:var(--navy2)}
.nav-in{overflow-x:auto}
.mainnav ul{display:flex;list-style:none;white-space:nowrap}
.mainnav li a{display:block;padding:13px 18px;color:#dbe4f2;font-size:15px;transition:background .15s}
.mainnav li a:hover{background:rgba(255,255,255,.08);color:#fff}
.mainnav li.on a{background:var(--orange);color:#fff;font-weight:600}

/* Hero */
.hero{background:linear-gradient(120deg,#0b2545 20%,#14406f 70%,#1d5aa8);color:#fff}
.hero-in{padding:52px 16px}
.hero-txt h1{font-size:34px;letter-spacing:2px;margin-bottom:10px}
.hero-txt h1::after{content:"";display:block;width:64px;height:4px;background:var(--orange);margin-top:12px;border-radius:2px}
.hero-txt p{color:#c3d2e8;font-size:15px;max-width:640px}
.hero-tags{margin-top:16px;display:flex;gap:10px;flex-wrap:wrap}
.hero-tags span{border:1px solid rgba(255,255,255,.35);padding:5px 16px;border-radius:20px;font-size:13px;color:#e8eef8}

/* 通用区块 */
.sec{margin:34px 0}
.sec-h{display:flex;align-items:baseline;gap:12px;margin-bottom:16px;border-bottom:2px solid var(--line);padding-bottom:10px}
.sec-h h2{font-size:21px;color:var(--navy);padding-left:12px;position:relative}
.sec-h h2::before{content:"";position:absolute;left:0;top:4px;bottom:4px;width:5px;background:var(--orange);border-radius:3px}
.sec-sub{font-size:13px;color:var(--muted)}

/* 分类卡片 */
.cat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.cat-card{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:18px;display:flex;flex-direction:column;gap:6px;transition:all .15s}
.cat-card:hover{border-color:var(--orange);box-shadow:0 6px 18px rgba(249,115,22,.15);transform:translateY(-2px)}
.cat-num{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;background:var(--navy2);color:#fff;font-size:14px;font-weight:700;border-radius:6px}
.cat-card:hover .cat-num{background:var(--orange)}
.cat-name{font-size:16px;font-weight:600;color:var(--navy)}
.cat-go{font-size:13px;color:var(--orange-d)}

/* 产品卡片网格 */
.prod-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.prod-grid.cols3{grid-template-columns:repeat(3,1fr)}
.prod-card{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:16px;display:flex;flex-direction:column;gap:8px;transition:all .15s;border-top:3px solid var(--navy2)}
.prod-card:hover{border-color:#cbd5e1;border-top-color:var(--orange);box-shadow:0 8px 20px rgba(11,37,69,.1);transform:translateY(-2px)}
.prod-card h3{font-size:15px;line-height:1.5;color:var(--navy);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;font-weight:600}
.prod-card:hover h3{color:var(--orange-d)}
.prod-card p{font-size:13px;color:var(--muted);line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;flex:1}
.pmeta{display:flex;justify-content:space-between;font-size:12px;color:#94a3b8;border-top:1px dashed var(--line);padding-top:8px}

/* 热门排行 */
.rank-list{list-style:none;background:var(--card);border:1px solid var(--line);border-radius:8px;overflow:hidden}
.rank-list li{display:flex;align-items:center;gap:12px;padding:12px 16px;border-bottom:1px solid #f1f5f9}
.rank-list li:last-child{border-bottom:none}
.rank-list li:hover{background:#fff7ed}
.rk{flex:none;width:26px;height:26px;display:inline-flex;align-items:center;justify-content:center;background:#e2e8f0;color:var(--muted);font-size:13px;font-weight:700;border-radius:4px}
.rk.top{background:var(--orange);color:#fff}
.rank-list a{flex:1;font-size:14.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rank-list a:hover{color:var(--orange-d)}
.rv{font-size:12px;color:#94a3b8;flex:none}

/* 品类精选 */
.cat-sec{margin-bottom:26px}
.cat-sec-h{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
.cat-sec-h h3{font-size:18px;color:var(--navy);border-left:4px solid var(--orange);padding-left:10px}
.cat-sec-h a{font-size:13px;color:var(--orange-d)}

/* 内页横幅 + 面包屑 */
.page-hero{background:linear-gradient(120deg,#0b2545,#1d5aa8);color:#fff;padding:30px 0}
.page-hero.slim{padding:16px 0}
.page-hero h1{font-size:26px;letter-spacing:1px}
.crumb{margin-top:8px;font-size:13px;color:#b9c6da}
.crumb a{color:#e8eef8}
.crumb a:hover{color:var(--orange)}
.crumb i{margin:0 8px;font-style:normal;color:#7d90ad}

/* 两栏布局 */
.layout{display:flex;gap:20px;margin:26px auto;align-items:flex-start}
.main{flex:1;min-width:0}
.side{width:300px;flex:none}

/* 侧栏 */
.side-box{background:var(--card);border:1px solid var(--line);border-radius:8px;margin-bottom:16px;overflow:hidden}
.side-h{background:var(--navy2);color:#fff;font-size:15px;font-weight:600;padding:11px 16px;border-left:5px solid var(--orange)}
.side-cats{list-style:none}
.side-cats li{border-bottom:1px solid #f1f5f9}
.side-cats li:last-child{border-bottom:none}
.side-cats a{display:block;padding:10px 16px;font-size:14px}
.side-cats a:hover{background:#fff7ed;color:var(--orange-d);padding-left:20px}
.side-rank{list-style:none;padding:6px 0}
.side-rank li{display:flex;gap:10px;align-items:flex-start;padding:8px 16px}
.side-rank a{font-size:13.5px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.side-rank a:hover{color:var(--orange-d)}
.side-new{list-style:none;padding:6px 0}
.side-new li{padding:8px 16px;border-bottom:1px dashed #f1f5f9}
.side-new li:last-child{border-bottom:none}
.side-new li::before{content:"▪";color:var(--orange);margin-right:8px}
.side-new a{font-size:13.5px}
.side-new a:hover{color:var(--orange-d)}

/* 产品详情 */
.pdetail{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:30px}
.pdetail h1{font-size:24px;color:var(--navy);line-height:1.5;margin-bottom:14px}
.art-meta{display:flex;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--muted);border-bottom:1px solid var(--line);padding-bottom:14px;margin-bottom:20px}
.mcat{background:#fff7ed;color:#c2410c;border:1px solid #fed7aa;padding:2px 12px;border-radius:12px;font-size:12.5px}
.art-body{font-size:15.5px;line-height:1.9;overflow:hidden}
.art-body img{max-width:100%;height:auto}
.art-body ul,.art-body ol{margin:10px 0 10px 22px}
.sec.rel{margin-top:26px}

/* 分页 */
.pagelist{margin:26px 0;text-align:center}
.pagelist a{display:inline-block;min-width:36px;padding:8px 12px;margin:0 4px;background:var(--card);border:1px solid var(--line);border-radius:6px;font-size:14px;color:var(--text)}
.pagelist a:hover{border-color:var(--orange);color:var(--orange-d)}
.pagelist a.on,.pagelist a.current{background:var(--orange);border-color:var(--orange);color:#fff;font-weight:600}

/* 页脚 */
.site-ft{background:var(--navy);color:#b9c6da;margin-top:40px}
.ft-in{display:flex;gap:40px;padding:34px 16px;flex-wrap:wrap}
.ft-brand b{font-size:24px;color:#fff;letter-spacing:1px}
.ft-brand p{font-size:13px;margin-top:8px;color:#8fa3c2}
.ft-nav{display:flex;flex-wrap:wrap;gap:6px 18px;align-content:flex-start;flex:1}
.ft-nav a{font-size:13.5px;color:#b9c6da}
.ft-nav a:hover{color:var(--orange)}
.ft-cp{border-top:1px solid rgba(255,255,255,.1);padding:14px 0;font-size:12.5px;color:#8fa3c2;text-align:center}

/* 响应式 */
@media(max-width:1024px){
    .prod-grid{grid-template-columns:repeat(3,1fr)}
    .prod-grid.cols4{grid-template-columns:repeat(3,1fr)}
    .cat-grid{grid-template-columns:repeat(3,1fr)}
    .layout{flex-direction:column}
    .side{width:100%}
}
@media(max-width:768px){
    .hd-tag{display:none}
    .hero-in{padding:36px 16px}
    .hero-txt h1{font-size:25px}
    .prod-grid,.prod-grid.cols3,.prod-grid.cols4{grid-template-columns:repeat(2,1fr)}
    .cat-grid{grid-template-columns:repeat(2,1fr)}
    .pdetail{padding:20px}
    .pdetail h1{font-size:20px}
    .topbar-in .tb-r{display:none}
}
@media(max-width:480px){
    .prod-grid,.prod-grid.cols3,.prod-grid.cols4{grid-template-columns:1fr}
    .cat-grid{grid-template-columns:1fr 1fr}
    .hero-txt h1{font-size:22px}
    .mainnav li a{padding:11px 13px;font-size:14px}
}