/* ===== 嘉兴晨邦 全站样式 v3.0 ===== */
:root{--primary:#1A73E8;--primary-dark:#0F4AB8;--accent:#FF8A00;--text-dark:#1F1F1F;--text-gray:#666;--bg-light:#F5F7FA;--card-bg:#fff;--radius:12px;--shadow:0 8px 30px rgba(0,0,0,.08);--bg:#fff;--text:#1F1F1F;--border:#e5e5e5}
body.dark{--bg:#121212;--text:#eaeaea;--card-bg:#1e1e1e;--bg-light:#252525;--border:#333;--primary:#4D9FFF;--accent:#FF9A2A;--text-dark:#eaeaea;--text-gray:#aaa;--shadow:0 8px 30px rgba(0,0,0,.3)}
body.dark{background:var(--bg);color:var(--text)}
body.dark .header{background:var(--card-bg);border-color:var(--border)}
body.dark .footer{background:#000}
body.dark section{background:var(--bg)}
body.dark section:nth-of-type(even){background:var(--card-bg)}
body.dark .product-card,.dark .solution-card,.dark .case-card,.dark .adv-card,.dark .material-card{background:var(--card-bg);border-color:var(--border);color:var(--text)}
body.dark .product-card p,.dark .solution-card p,.dark .case-card p,.dark .adv-card p{color:var(--text-gray)}
body.dark .product-card h3,.dark .solution-card h3,.dark .case-card h3,.dark .adv-card h3,.dark section h2{color:var(--text-dark)}
body.dark .hero-small,.dark .case-hero{background:#000}
.dark-btn{position:fixed;left:20px;bottom:20px;z-index:99;padding:8px 14px;border-radius:999px;border:1px solid #ddd;background:#fff;cursor:pointer;font-size:13px;box-shadow:var(--shadow)}
body.dark .dark-btn{background:var(--card-bg);color:var(--text);border-color:var(--border)}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:"PingFang SC","HarmonyOS Sans","MiSans","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg);line-height:1.7;font-size:18px}
a{text-decoration:none;color:inherit}img{max-width:100%}
.container{max-width:1200px;margin:0 auto;padding:0 32px}

/* Buttons */
.btn-primary{display:inline-block;background:var(--primary);color:#fff;padding:16px 36px;border-radius:8px;font-size:18px;font-weight:700;transition:.25s;box-shadow:0 4px 15px rgba(26,115,232,.3)}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 8px 25px rgba(26,115,232,.4)}
.btn-secondary{display:inline-block;border:2px solid var(--primary);color:var(--primary);padding:14px 34px;border-radius:8px;font-size:18px;font-weight:700;transition:.25s}
.btn-secondary:hover{background:var(--primary);color:#fff}

/* Hero */
.hero-section{display:flex;align-items:center;min-height:650px;background:linear-gradient(120deg,rgba(10,40,90,.85),rgba(10,40,90,.55)),url('images/epoxy-03.jpg') center/cover no-repeat;padding:100px 48px;color:#fff;gap:60px}
.hero-content{flex:1}
.hero-content h1{font-size:48px;line-height:1.3;margin-bottom:20px;font-weight:800}
.hero-subtitle{font-size:22px;opacity:.9;margin-bottom:35px}
.hero-buttons{display:flex;gap:18px;flex-wrap:wrap}
.hero-stats{display:flex;gap:40px;list-style:none;margin-top:50px;padding:0}
.hero-stats li{font-size:16px;opacity:.75;font-weight:700;letter-spacing:.5px}
.hero-image{flex:1;text-align:center}
.hero-image img{max-width:100%;border-radius:16px;box-shadow:0 20px 60px rgba(0,0,0,.4)}

.hero-small{padding:100px 0;text-align:center;background:linear-gradient(135deg,#0a1628,#1a3c6e);color:#fff}
.hero-small h1{font-size:42px;margin-bottom:15px}
.hero-small p{font-size:20px;opacity:.85;margin-bottom:30px}

/* Sections - 白底+浅灰交替（蓝图规范）*/
section{padding:100px 0;background:#fff}
section:nth-of-type(even){background:var(--bg-light)}
section h2{font-size:36px;color:var(--text-dark);text-align:center;margin-bottom:18px;font-weight:800}
section>p{text-align:center;color:var(--text-gray);margin-bottom:50px;font-size:18px}

/* Product Grid */
.product-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:24px;margin-top:20px}
.product-card{background:linear-gradient(135deg,#fff,#f0f6ff);border:1px solid #e8e8e8;border-radius:var(--radius);padding:36px 24px;text-align:center;transition:.3s;box-shadow:var(--shadow)}
.product-card:hover{border-color:var(--primary);transform:translateY(-6px);box-shadow:0 16px 40px rgba(0,0,0,.12)}
.product-card h3{font-size:20px;color:var(--text-dark);margin-bottom:10px}
.product-card p{font-size:15px;color:var(--text-gray)}

/* Solution Grid */
.solution-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:20px}
.solution-card{display:block;background:var(--card-bg);border-radius:var(--radius);padding:32px 20px;text-align:center;transition:.3s;box-shadow:var(--shadow);border-left:6px solid var(--primary)}
.solution-card:hover{transform:translateY(-6px);box-shadow:0 16px 40px rgba(0,0,0,.12)}
.solution-card h3{font-size:20px;color:var(--text-dark);margin-bottom:8px}
.solution-card p{font-size:14px;color:var(--text-gray);margin-bottom:10px}
.solution-card .link{color:var(--primary);font-size:14px;font-weight:700}

/* Case Grid */
.case-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px;margin-top:20px}
.case-card{background:var(--card-bg);border-radius:var(--radius);padding:32px;transition:.3s;box-shadow:var(--shadow);border-top:4px solid var(--primary)}
.case-card:hover{transform:translateY(-6px);box-shadow:0 16px 40px rgba(0,0,0,.12)}
.case-card h3{font-size:18px;color:var(--text-dark);margin-bottom:10px}
.case-card p{font-size:15px;color:var(--text-gray);margin-bottom:14px}
.case-card .link,.case-card a{color:var(--primary);font-size:15px;font-weight:700}
.cases-cta{text-align:center;margin-top:40px}

/* Advantages */
.adv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:20px}
.adv-card{background:var(--bg-light);border-radius:var(--radius);padding:40px 24px;text-align:center;transition:.3s;border-left:4px solid var(--primary)}
.adv-card:hover{background:#fff;box-shadow:var(--shadow);transform:translateY(-4px)}
.adv-card h3{font-size:22px;color:var(--text-dark);margin-bottom:10px}
.adv-card p{font-size:15px;color:var(--text-gray)}

/* Process */
.process-steps{display:flex;list-style:none;gap:20px;padding:0;counter-reset:step;flex-wrap:wrap;justify-content:center}
.process-steps li{flex:1;min-width:160px;text-align:center;padding:25px 15px;background:#F5F7FA;border-radius:12px;font-size:15px;color:#333;position:relative}
.process-steps li::before{counter-increment:step;content:counter(step);display:block;width:40px;height:40px;background:#1A73E8;color:#fff;border-radius:50%;margin:0 auto 12px;line-height:40px;font-weight:bold;font-size:18px}

/* Material Grid */
.material-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:15px;margin-top:20px}
.material-card{background:#fff;border:1px solid #e0e0e0;border-radius:12px;padding:25px;text-align:center;transition:.3s;box-shadow:0 2px 10px rgba(0,0,0,.03)}
.material-card:hover{border-color:#1A73E8}
.material-card h3{font-size:17px;color:#1a3c6e;margin-bottom:6px}
.material-card p{font-size:14px;color:#888}

/* Pain/Feature/Usage sections */
.pain ul,.feature ul,.tech-adv ul{max-width:700px;margin:20px auto;list-style:none;padding:0}
.pain li,.feature li,.tech-adv li{padding:12px 20px;margin-bottom:8px;background:#F5F7FA;border-radius:8px;font-size:15px;color:#333;border-left:3px solid #1A73E8}

.scene-tags{display:flex;flex-wrap:wrap;gap:10px;list-style:none;padding:0;justify-content:center;margin-top:15px}
.scene-tags li{background:#F5F7FA;padding:8px 20px;border-radius:50px;font-size:14px;color:#1a3c6e;font-weight:500}

.params ul{max-width:600px;margin:20px auto;list-style:none}
.params li{padding:10px 0;border-bottom:1px solid #eee;font-size:15px;color:#333;display:flex;justify-content:space-between}

/* CTA */
.cta{text-align:center;padding:60px 20px;background:#F5F7FA;border-radius:16px;margin:40px 0}
.cta h2{font-size:26px;margin-bottom:10px}
.cta-buttons{display:flex;gap:15px;justify-content:center;margin-top:20px;flex-wrap:wrap}

/* Contact CTA */
.contact-cta{text-align:center;padding:60px 20px;background:linear-gradient(135deg,#1a3c6e,#0a1628);color:#fff;border-radius:16px;margin:40px 0}
.contact-cta h2{color:#fff}
.contact-cta strong{color:#FF8A00;font-size:22px}

/* Footer */
.footer{background:#0a1628;color:#aaa;padding:50px 0 30px;margin-top:0}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:30px;max-width:1200px;margin:0 auto;padding:0 20px}
.footer h4{color:#fff;font-size:16px;margin-bottom:15px}
.footer a,.footer p{font-size:13px;color:#aaa;margin-bottom:6px;display:block}
.footer a:hover{color:#1A73E8}
.footer-bottom{text-align:center;padding:20px;border-top:1px solid rgba(255,255,255,.1);margin-top:30px;font-size:12px;color:#666}

/* Header - 白底（蓝图规范）*/
.header{background:#fff;box-shadow:0 2px 20px rgba(0,0,0,.06);position:sticky;top:0;z-index:100;padding:0 32px}
.header-inner{max-width:1200px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;height:auto;padding:12px 0}
.header .logo{font-size:22px;font-weight:800;color:var(--text-dark);display:flex;align-items:center;gap:10px}
.header .logo span{color:#FF8A00}
.header .nav{display:flex;gap:32px}
.header .nav a{font-size:17px;color:var(--text-dark);font-weight:600;transition:.25s;padding:8px 0}
.header .nav a:hover{color:var(--primary)}
.header .nav a::after{background:var(--primary)}
.header .phone{font-size:18px;color:#fff;font-weight:700;background:var(--primary);padding:10px 20px;border-radius:8px}
.header .back{font-size:15px;color:var(--primary);font-weight:600}

/* ===== Animations ===== */
.card,.product-card,.solution-card,.case-card,.adv-card,.material-card{transition:transform .25s ease,box-shadow .25s ease}
.btn-primary{background:linear-gradient(135deg,#1A73E8,#0F4AB8);transition:.25s ease}
.btn-primary:hover{background:linear-gradient(135deg,#0F4AB8,#1A73E8);transform:translateY(-1px)}

/* Nav underline - blue */
.nav a{position:relative}
.nav a::after{content:"";position:absolute;left:0;bottom:-4px;width:0;height:2px;background:var(--primary);transition:width .25s ease}
.nav a:hover::after{width:100%}

/* Scroll fade-in */
.animate-section{opacity:0;transform:translateY(30px);transition:opacity .6s ease,transform .6s ease}
.animate-section.visible{opacity:1;transform:translateY(0)}

/* Case card with thumbnail */
.case-card-thumb{display:grid;grid-template-columns:260px 1fr;gap:20px;background:#fff;border-radius:16px;box-shadow:var(--shadow);padding:20px;align-items:center}
.case-card-thumb .case-img-wrap{position:relative;overflow:hidden;border-radius:12px}
.case-card-thumb .case-img-wrap img{width:100%;height:180px;object-fit:cover;transition:transform .3s ease}
.case-card-thumb:hover .case-img-wrap img{transform:scale(1.05)}
.case-tag{position:absolute;top:10px;left:10px;padding:5px 12px;border-radius:999px;font-size:12px;color:#fff;font-weight:600}
.case-tag.city{background:rgba(26,115,232,.9)}
.case-tag.material{top:38px;background:rgba(255,138,0,.9)}
.case-card-thumb .case-body h3{font-size:20px;margin-bottom:8px}
.case-card-thumb .case-body p{color:var(--text-gray);margin-bottom:10px;font-size:15px}
.case-card-thumb .case-meta{font-size:13px;color:#888;display:flex;gap:16px;margin-bottom:10px}

/* ===== Article Detail ===== */
.kb-article{max-width:800px;margin:40px auto;padding:0 20px 60px}
.kb-article-header{margin-bottom:24px}
.kb-tag{display:inline-block;padding:4px 12px;border-radius:999px;background:#E3F2FD;color:var(--primary);font-size:13px;font-weight:600;margin-bottom:10px}
.kb-article-header h1{font-size:32px;margin-bottom:12px;line-height:1.3}
.kb-meta{font-size:14px;color:#888;display:flex;gap:20px;flex-wrap:wrap;margin-top:8px}
.kb-article-intro{background:var(--bg-light);border-radius:12px;padding:20px 24px;margin:24px 0;font-size:17px;color:#444}
.kb-article-section{margin-top:32px}
.kb-article-section h2{font-size:22px;margin-bottom:12px;text-align:left}
.kb-article-section ul{padding-left:20px;color:#555}
.kb-article-section li{margin-bottom:8px}
.kb-article-cta{background:#E3F2FD;border-radius:12px;padding:28px 24px;text-align:center;margin-top:40px}

/* ===== Case Detail ===== */
.case-detail{max-width:900px;margin:40px auto;padding:0 20px 60px}
.case-detail-header{margin-bottom:24px}
.case-detail-header h1{font-size:30px;margin-bottom:12px}
.case-detail-hero img{width:100%;border-radius:16px;box-shadow:var(--shadow);margin:24px 0}
.case-detail-section{margin-top:32px}
.case-detail-section h2{font-size:22px;margin-bottom:12px;text-align:left}
.case-detail-section ul{padding-left:20px;color:#555}
.case-detail-section li{margin-bottom:8px}
.case-detail-cta{background:#E3F2FD;border-radius:12px;padding:28px 24px;text-align:center;margin-top:40px}

/* Responsive */
@media(max-width:768px){
  .case-card-thumb{grid-template-columns:1fr}
  .kb-article-header h1{font-size:24px}
  .case-detail-header h1{font-size:22px}
  .hero-section{flex-direction:column;padding:60px 20px;min-height:auto;gap:30px}
  .hero-content h1{font-size:28px}
  .hero-stats{flex-wrap:wrap;gap:15px}
  .solution-grid{grid-template-columns:repeat(2,1fr)}
  .adv-grid{grid-template-columns:repeat(2,1fr)}
  .process-steps{flex-direction:column}
  .header .nav{display:none}
}