/* ===== 京唐云仓 全站统一样式 ===== */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;color:#1a1a2e;background:#fff;line-height:1.6}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
a{color:inherit}

/* Header */
.header{position:fixed;top:0;left:0;right:0;background:rgba(255,255,255,.95);backdrop-filter:blur(10px);border-bottom:1px solid #eee;z-index:100;height:72px}
.nav{display:flex;align-items:center;justify-content:space-between;height:100%}
.logo{display:flex;align-items:center;gap:12px;text-decoration:none;color:#1a1a2e}
.logo img{height:44px}
.logo-text{font-size:18px;font-weight:700;letter-spacing:1px}
.logo-text span{color:#e63946;font-size:12px;font-weight:500;display:block;letter-spacing:3px}
.nav-menu{display:flex;gap:30px;list-style:none;align-items:center}
.nav-menu>li{position:relative}
.nav-menu a{color:#1a1a2e;text-decoration:none;font-size:15px;font-weight:500;transition:color .2s;white-space:nowrap}
.nav-menu a:hover{color:#e63946}
.nav-menu a.active{color:#e63946}
/* dropdown */
.has-sub>a::after{content:"▾";font-size:11px;margin-left:4px;color:#94a3b8}
.submenu{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(10px);background:#fff;border:1px solid #eee;border-radius:12px;box-shadow:0 16px 40px rgba(26,26,46,.12);padding:10px;min-width:170px;opacity:0;visibility:hidden;transition:all .22s;list-style:none}
.has-sub:hover .submenu{opacity:1;visibility:visible;transform:translateX(-50%) translateY(6px)}
.submenu li a{display:block;padding:10px 16px;border-radius:8px;font-size:14px;font-weight:500}
.submenu li a:hover{background:#f8fafc;color:#e63946}
.nav-cta{background:#1a1a2e;color:#fff;padding:10px 22px;border-radius:24px;text-decoration:none;font-size:14px;font-weight:500;transition:all .2s}
.nav-cta:hover{background:#e63946}

/* Page hero (inner pages) */
.page-hero{padding:128px 0 60px;background:linear-gradient(135deg,#1a1a2e 0%,#16213e 100%);color:#fff;position:relative;overflow:hidden}
.page-hero::before{content:"";position:absolute;top:0;right:0;width:46%;height:100%;background:url('/aerial.jpg') center/cover;opacity:.16}
.page-hero-inner{position:relative;z-index:2;max-width:760px}
.crumb{font-size:13px;color:#94a3b8;margin-bottom:18px}
.crumb a{color:#94a3b8;text-decoration:none}
.crumb a:hover{color:#e63946}
.page-hero .kicker{display:inline-block;background:rgba(230,57,70,.15);color:#e63946;padding:5px 15px;border-radius:20px;font-size:12px;font-weight:600;letter-spacing:2px;margin-bottom:18px;border:1px solid rgba(230,57,70,.3)}
.page-hero h1{font-size:44px;line-height:1.2;margin-bottom:18px;font-weight:700}
.page-hero h1 em{font-style:normal;color:#e63946}
.page-hero p{font-size:17px;color:#cbd5e1;max-width:620px}

/* Section */
.section{padding:84px 0}
.section.alt{background:#f8fafc}
.section-head{text-align:center;margin-bottom:56px}
.section-tag{color:#e63946;font-size:13px;font-weight:600;letter-spacing:3px;margin-bottom:12px}
.section-title{font-size:34px;font-weight:700;color:#1a1a2e;margin-bottom:14px}
.section-sub{color:#64748b;font-size:16px;max-width:680px;margin:0 auto}

/* Stat strip */
.stat-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:28px;margin-top:40px}
.stat-box{background:#fff;border:1px solid #eee;border-radius:16px;padding:30px 22px;text-align:center;position:relative;overflow:hidden}
.stat-box::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:#e63946}
.stat-box .n{font-size:36px;font-weight:700;color:#1a1a2e;line-height:1}
.stat-box .n small{color:#e63946;font-size:20px}
.stat-box .l{font-size:13px;color:#64748b;margin-top:10px}

/* generic cards grid */
.cards{display:grid;gap:24px}
.cards.c2{grid-template-columns:repeat(2,1fr)}
.cards.c3{grid-template-columns:repeat(3,1fr)}
.cards.c4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid #eee;border-radius:16px;padding:30px 26px;transition:all .3s;position:relative;overflow:hidden}
.card:hover{transform:translateY(-4px);box-shadow:0 20px 48px rgba(26,26,46,.08);border-color:#e63946}
.card .ico{width:48px;height:48px;background:#1a1a2e;border-radius:12px;display:flex;align-items:center;justify-content:center;color:#fff;margin-bottom:18px;font-size:22px}
.card:hover .ico{background:#e63946}
.card h3{font-size:19px;margin-bottom:10px;color:#1a1a2e}
.card p{color:#64748b;font-size:14px;line-height:1.7}
.card .num-bg{font-size:46px;font-weight:700;color:#f1f5f9;position:absolute;top:14px;right:22px;line-height:1}

/* feature list two col */
.flow-wrap{max-width:920px;margin:0 auto}
.flow-step{display:flex;gap:24px;padding:26px 0;border-bottom:1px dashed #e2e8f0}
.flow-step:last-child{border-bottom:none}
.flow-no{flex-shrink:0;width:54px;height:54px;border-radius:14px;background:#1a1a2e;color:#fff;display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:700}
.flow-step:nth-child(odd) .flow-no{background:#e63946}
.flow-body h4{font-size:18px;margin-bottom:6px;color:#1a1a2e}
.flow-body p{color:#64748b;font-size:14px;line-height:1.75}
.flow-body .tag{display:inline-block;background:#fef2f2;color:#e63946;font-size:12px;padding:2px 10px;border-radius:10px;margin-bottom:8px;font-weight:600}

/* checklist */
.checklist{list-style:none;max-width:860px;margin:0 auto}
.checklist li{display:flex;gap:14px;padding:14px 0;border-bottom:1px dashed #e2e8f0;color:#334155;font-size:15px;align-items:flex-start}
.checklist li:last-child{border-bottom:none}
.checklist li::before{content:"✓";flex-shrink:0;width:22px;height:22px;background:#e63946;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:12px;margin-top:2px}
.checklist li b{color:#1a1a2e}

/* split */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.split .txt h2{font-size:30px;margin-bottom:18px;color:#1a1a2e;line-height:1.3}
.split .txt h2 em{color:#e63946;font-style:normal}
.split .txt p{color:#475569;font-size:15px;margin-bottom:16px;line-height:1.85}
.split-img{border-radius:16px;overflow:hidden;box-shadow:0 20px 48px rgba(0,0,0,.1)}
.split-img img{width:100%;display:block}

/* pain points (dark) */
.pain-section{background:#1a1a2e;color:#fff}
.pain-section .section-title{color:#fff}
.pain-section .section-sub{color:#94a3b8}
.pain-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.pain-item{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:14px;padding:24px 20px}
.pain-item .pn{color:#e63946;font-size:13px;font-weight:700;margin-bottom:10px}
.pain-item p{color:#cbd5e1;font-size:14px;line-height:1.6}

/* temp zones / spec table */
.spec{width:100%;border-collapse:collapse;max-width:900px;margin:0 auto;background:#fff;border-radius:14px;overflow:hidden;box-shadow:0 10px 30px rgba(26,26,46,.06)}
.spec th{background:#1a1a2e;color:#fff;padding:16px 20px;text-align:left;font-size:14px;font-weight:600}
.spec td{padding:15px 20px;border-bottom:1px solid #eef1f5;font-size:14px;color:#334155}
.spec tr:nth-child(even) td{background:#f8fafc}
.spec tr:last-child td{border-bottom:none}
.spec td b{color:#e63946}

/* CTA band */
.cta-band{background:linear-gradient(135deg,#1a1a2e 0%,#16213e 100%);color:#fff;text-align:center;padding:72px 0}
.cta-band h2{font-size:32px;margin-bottom:14px}
.cta-band p{color:#cbd5e1;margin-bottom:30px;font-size:16px}
.cta-band .phone{font-size:38px;font-weight:700;color:#e63946;margin-bottom:26px;letter-spacing:1px}
.btn-primary{background:#e63946;color:#fff;padding:14px 34px;border-radius:28px;text-decoration:none;font-weight:500;transition:all .2s;display:inline-block;border:none;cursor:pointer}
.btn-primary:hover{background:#d62839;transform:translateY(-2px);box-shadow:0 10px 24px rgba(230,57,70,.3)}
.btn-outline{border:1px solid rgba(255,255,255,.3);color:#fff;padding:14px 34px;border-radius:28px;text-decoration:none;font-weight:500;transition:all .2s;display:inline-block}
.btn-outline:hover{background:rgba(255,255,255,.1)}

/* solution cross-links */
.sol-links{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.sol-link{display:block;background:#fff;border:1px solid #eee;border-radius:16px;padding:28px;text-decoration:none;transition:.3s}
.sol-link:hover{border-color:#e63946;transform:translateY(-4px);box-shadow:0 20px 48px rgba(26,26,46,.08)}
.sol-link .si{font-size:30px;margin-bottom:12px}
.sol-link h4{color:#1a1a2e;font-size:18px;margin-bottom:6px}
.sol-link p{color:#64748b;font-size:13px}
.sol-link .go{color:#e63946;font-size:13px;font-weight:600;margin-top:12px;display:inline-block}

/* Footer */
.footer{background:#0f172a;color:#94a3b8;padding:48px 0 24px;font-size:14px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:48px;margin-bottom:32px}
.footer-brand img{height:36px;margin-bottom:16px;filter:brightness(0) invert(1) opacity(.9)}
.footer-brand p{color:#64748b;line-height:1.7;font-size:13px}
.footer-col h5{color:#fff;font-size:14px;margin-bottom:16px;font-weight:600}
.footer-col a{color:#94a3b8;text-decoration:none;display:block;padding:6px 0;font-size:13px;transition:color .2s}
.footer-col a:hover{color:#e63946}
.footer-bottom{border-top:1px solid #1e293b;padding-top:24px;text-align:center;font-size:13px;color:#64748b}
.footer-bottom a{color:#64748b;text-decoration:none}

/* Mobile */
@media(max-width:768px){
.nav-menu,.nav-cta{display:none}
.page-hero{padding:108px 0 48px}
.page-hero h1{font-size:30px}
.section{padding:56px 0}
.section-title{font-size:26px}
.stat-strip{grid-template-columns:repeat(2,1fr)}
.cards.c2,.cards.c3,.cards.c4{grid-template-columns:1fr}
.pain-grid{grid-template-columns:1fr 1fr}
.split{grid-template-columns:1fr;gap:28px}
.sol-links{grid-template-columns:1fr}
.footer-grid{grid-template-columns:1fr 1fr;gap:32px}
.cta-band h2{font-size:24px}
.cta-band .phone{font-size:28px}
}

/* ===== 资质证书展示 ===== */
.cert-head{text-align:center;margin:54px 0 30px}
.cert-title{font-size:26px;color:#1a1a2e;margin:10px 0 8px;font-weight:700}
.cert-sub{color:#64748b;font-size:15px;max-width:680px;margin:0 auto;line-height:1.7}
.cert-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;max-width:1080px;margin:0 auto}
.cert-card{display:block;background:#fff;border:1px solid #e8e8ee;border-radius:12px;overflow:hidden;text-decoration:none;transition:.3s;position:relative}
.cert-card:hover{transform:translateY(-5px);box-shadow:0 18px 40px rgba(26,26,46,.14);border-color:#e63946}
.cert-img{position:relative;background:#f4f6fa;height:188px;overflow:hidden}
.cert-img img{width:100%;height:100%;object-fit:cover;object-position:top center;display:block}
.cert-img::after{content:"🔍 点击放大";position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(26,26,46,.55);color:#fff;font-size:14px;font-weight:600;opacity:0;transition:.3s}
.cert-card:hover .cert-img::after{opacity:1}
.cert-name{padding:13px 12px 15px;font-size:13px;color:#1a1a2e;font-weight:600;line-height:1.45;text-align:center}
.cert-badge{display:inline-block;margin-top:7px;font-size:10px;color:#e63946;background:#fef2f3;border:1px solid #fad4d7;border-radius:20px;padding:2px 12px;font-weight:600;letter-spacing:.5px}
.cert-foot{text-align:center;color:#94a3b8;font-size:13px;margin-top:26px}
.cert-foot b{color:#475569}
@media(max-width:1080px){.cert-grid{grid-template-columns:repeat(3,1fr);max-width:680px}}
@media(max-width:760px){.cert-grid{grid-template-columns:repeat(2,1fr);max-width:430px}.cert-img{height:170px}}