/* 成都敏华NST消防应急灯具 - 站点样式 v2 */
:root{
  --red:#b91c1c;
  --red-dark:#7f1d1d;
  --red-soft:#fef2f2;
  --gold:#d97706;
  --ink:#1e293b;
  --muted:#64748b;
  --line:#e2e8f0;
  --bg:#f8fafc;
  --card:#ffffff;
  --navy:#0f1f3d;
  --navy2:#16294d;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;color:var(--ink);background:var(--bg);line-height:1.75;font-size:15px}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}

/* 顶栏 */
.topbar{background:var(--navy);color:#b6c2d8;font-size:12.5px;padding:7px 0;letter-spacing:.02em}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center}
.topbar b{color:#fff;font-weight:600}

/* 导航 */
.header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.header .wrap{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:6px 24px;min-height:76px;padding:10px 0}
.brand{display:flex;align-items:center;gap:13px}
.brand img.logo{height:72px;width:auto;border-radius:10px;flex-shrink:0}
.brand-txt{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap}
.brand .t1{font-size:26px;font-weight:900;letter-spacing:.02em;color:var(--red-dark);line-height:1.25;text-shadow:0 1px 0 rgba(185,28,28,.08);white-space:nowrap}
.brand .t1 span{color:var(--red)}
.brand .t2{font-size:14.5px;color:var(--muted);letter-spacing:.12em;white-space:nowrap}
@media(max-width:640px){.brand .t1{font-size:19px}.brand .t2{font-size:12px}.brand img.logo{height:54px}}
.nav{display:flex;gap:4px;flex-wrap:wrap}
.nav a{padding:11px 20px;border-radius:9px;font-size:15px;font-weight:600;color:#334155;transition:.2s;white-space:nowrap}
.nav a:hover{color:var(--red);background:var(--red-soft)}
.nav a.on{color:#fff;background:var(--red)}

/* 横幅 */
.hero{background:radial-gradient(1100px 420px at 75% -60px,rgba(217,119,6,.28),transparent 60%),linear-gradient(115deg,#0b1730 0%,#13294f 55%,#5f1414 100%);color:#fff;padding:84px 0 76px;position:relative;overflow:hidden}
.hero .kicker{display:inline-block;font-size:12.5px;letter-spacing:.22em;color:#fcd9a0;border:1px solid rgba(252,217,160,.4);padding:6px 16px;border-radius:20px;margin-bottom:20px}
.hero h1{font-size:40px;line-height:1.45;margin-bottom:16px;font-weight:800;letter-spacing:.01em}
.hero h1 em{font-style:normal;color:#fbbf24}
.hero p{color:#c9d6ec;max-width:660px;font-size:15.5px}
.hero .cta{margin-top:30px;display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-block;padding:13px 34px;border-radius:10px;font-weight:700;font-size:15px;transition:.2s;letter-spacing:.02em}
.btn-red{background:var(--red);color:#fff;box-shadow:0 6px 18px rgba(185,28,28,.35)}
.btn-red:hover{background:var(--red-dark);transform:translateY(-1px)}
.btn-ghost{border:1.5px solid rgba(255,255,255,.55);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12)}

/* 通用区块 */
.section{padding:70px 0}
.sec-head{text-align:center;margin-bottom:44px}
.sec-head .en{font-size:12px;letter-spacing:.3em;color:var(--gold);font-weight:700;margin-bottom:10px}
.sec-head h2{font-size:31px;font-weight:800;margin-bottom:10px;letter-spacing:.01em}
.sec-head h2::after{content:"";display:block;width:60px;height:4px;background:linear-gradient(90deg,var(--red),var(--gold));margin:16px auto 0;border-radius:2px}
.sec-head p{color:var(--muted);max-width:740px;margin:0 auto;font-size:14.5px}

/* 优势 */
.adv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.adv{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:32px 24px;text-align:center;transition:.25s}
.adv:hover{transform:translateY(-5px);box-shadow:0 16px 36px rgba(185,28,28,.10);border-color:#fecaca}
.adv .ic{width:60px;height:60px;margin:0 auto 16px;border-radius:18px;background:linear-gradient(135deg,var(--red-soft),#fee2e2);color:var(--red);display:flex;align-items:center;justify-content:center;font-size:27px;font-weight:800}
.adv h3{font-size:16.5px;margin-bottom:8px;font-weight:700}
.adv p{font-size:13px;color:var(--muted);line-height:1.65}

/* 分类标题 */
.cat-block{margin-bottom:8px}
.cat-title{display:flex;align-items:center;gap:14px;margin:52px 0 8px}
.cat-title .num{width:38px;height:38px;border-radius:10px;background:var(--navy);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:16px;flex-shrink:0}
.cat-title h3{font-size:23px;font-weight:800}
.cat-title .tag{background:var(--red);color:#fff;font-size:11.5px;padding:4px 13px;border-radius:20px;letter-spacing:.05em}
.cat-desc{color:var(--muted);font-size:14px;margin:0 0 20px 52px;max-width:900px}
.sub-title{font-size:16.5px;font-weight:700;margin:30px 0 16px;padding-left:14px;border-left:4px solid var(--red);color:var(--ink)}

/* 产品参数卡 */
.p-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.p-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px;transition:.22s;position:relative;overflow:hidden}
.p-card::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--red),var(--gold));opacity:0;transition:.22s}
.p-card:hover{transform:translateY(-4px);box-shadow:0 14px 32px rgba(15,31,61,.10);border-color:#fca5a5}
.p-card:hover::before{opacity:1}
.p-card .model{font-size:12px;color:var(--red);font-weight:700;letter-spacing:.02em;margin-bottom:6px}
.p-card h4{font-size:16px;font-weight:700;margin-bottom:10px;line-height:1.5}
.spec{width:100%;font-size:12.8px;border-collapse:collapse}
.spec td{padding:5px 0;border-top:1px dashed var(--line);vertical-align:top}
.spec td:first-child{color:var(--muted);width:76px;white-space:nowrap}
.spec td:last-child{font-weight:500}

/* 紧凑产品条 */
.p-list{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.p-item{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:13px 18px;display:flex;gap:12px;align-items:baseline;transition:.2s}
.p-item:hover{border-color:#fca5a5;box-shadow:0 6px 16px rgba(15,31,61,.07)}
.p-item .m{font-size:12px;color:var(--red);font-weight:700;white-space:nowrap}
.p-item .n{font-size:13.8px}
.p-item .s{font-size:12px;color:var(--muted);margin-left:auto;white-space:nowrap}

/* 分类快捷导航 */
.cat-nav{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:16px}
.cat-nav a{background:#fff;border:1px solid var(--line);padding:10px 22px;border-radius:26px;font-size:14px;font-weight:600;transition:.2s}
.cat-nav a:hover{border-color:var(--red);color:var(--red);box-shadow:0 4px 12px rgba(185,28,28,.10)}

/* 案例 */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.case{background:var(--card);border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:.22s}
.case:hover{transform:translateY(-4px);box-shadow:0 14px 30px rgba(15,31,61,.10)}
.case .im{aspect-ratio:16/9;background:linear-gradient(135deg,#1e3a5f,#3b1d1d);display:flex;align-items:center;justify-content:center;color:#e8edf5;font-size:16px;font-weight:700;letter-spacing:.06em;overflow:hidden}
.case .im img{width:100%;height:100%;object-fit:cover}
.case h4{padding:16px 20px;font-size:15px;font-weight:600}
.case p{padding:0 20px 18px;font-size:13px;color:var(--muted)}

/* 关于/联系 */
.about-box{background:#fff;border:1px solid var(--line);border-radius:16px;padding:40px}
.about-box h3{font-size:19px;font-weight:700;margin:26px 0 12px}
.about-box h3:first-child{margin-top:0}
.about-box p{font-size:14.5px;color:#334155}
.kv{display:grid;grid-template-columns:110px 1fr;gap:10px 18px;font-size:14.5px;margin-top:14px}
.kv dt{color:var(--muted)}
.kv dd{font-weight:500}
.contact-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-bottom:34px}
.contact-cards .cc{background:#fff;border:1px solid var(--line);border-radius:16px;padding:30px 24px;text-align:center;transition:.22s}
.contact-cards .cc:hover{transform:translateY(-4px);box-shadow:0 14px 30px rgba(15,31,61,.10)}
.contact-cards .cc .ic{width:58px;height:58px;margin:0 auto 14px;border-radius:50%;background:var(--red-soft);color:var(--red);display:flex;align-items:center;justify-content:center;font-size:24px}
.contact-cards .cc h3{font-size:16px;margin-bottom:8px;font-weight:700}
.contact-cards .cc p{font-size:15px;font-weight:700;color:var(--red)}

/* 页脚 */
.footer{background:var(--navy);color:#93a3c0;padding:54px 0 0;margin-top:24px}
.footer .cols{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:36px;padding-bottom:36px}
.footer h4{color:#fff;font-size:16px;margin-bottom:16px;font-weight:700}
.footer p,.footer li{font-size:13.5px;line-height:2.1;list-style:none}
.footer a:hover{color:#fff}
.copy{border-top:1px solid #1e3257;padding:18px 0;font-size:12.5px;text-align:center;color:#5b6b8c}

/* 面包屑 */
.crumb{background:#fff;border-bottom:1px solid var(--line);padding:15px 0;font-size:13px;color:var(--muted)}
.crumb b{color:var(--ink)}

/* 系统介绍 */
.sys-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.sys{background:#fff;border:1px solid var(--line);border-radius:16px;padding:30px 26px}
.sys .k{font-size:12px;color:var(--gold);font-weight:700;letter-spacing:.18em;margin-bottom:8px}
.sys h3{font-size:17px;margin-bottom:10px;font-weight:700}
.sys p{font-size:13.5px;color:var(--muted)}

@media(max-width:960px){
  .adv-grid,.p-grid,.sys-grid{grid-template-columns:repeat(2,1fr)}
  .case-grid,.contact-cards,.footer .cols{grid-template-columns:1fr}
  .p-list{grid-template-columns:1fr}
  .nav{display:none}
  .hero h1{font-size:29px}
  .cat-desc{margin-left:0}
}
@media(max-width:600px){
  .adv-grid,.p-grid,.sys-grid{grid-template-columns:1fr}
}

/* 产品卡链接与缩略图 */
a.p-card{display:block;color:inherit}
a.p-item{color:inherit}
.p-card .thumb{display:flex;align-items:center;justify-content:center;aspect-ratio:4/3;background:#f8fafc;border:1px solid var(--line);border-radius:10px;margin-bottom:14px;overflow:hidden}
.p-card .thumb img{max-width:92%;max-height:92%;object-fit:contain}
.p-card .thumb.noimg{color:#94a3b8;font-size:12.5px}
.p-item{align-items:center}
.p-item .pthumb{width:58px;height:58px;flex-shrink:0;background:#f8fafc;border:1px solid var(--line);border-radius:8px;overflow:hidden;display:flex;align-items:center;justify-content:center}
.p-item .pthumb img{max-width:92%;max-height:92%;object-fit:contain}
.p-item .pthumb.noimg{color:#94a3b8;font-size:10px}

/* 长产品名排版适配 */
.p-card h4{font-size:15px;line-height:1.6;word-break:break-all}
.p-item{flex-wrap:nowrap}
.p-item .m{flex-shrink:0}
.p-item .n{flex:1 1 auto;min-width:0;line-height:1.6}
.p-item .s{flex-shrink:0}
.pd-info h1{font-size:22px;line-height:1.6}