/* ============================================================
   亿霖官网 · 产品基建页共享样式
   设计规范：DESIGN.md 通用审美规范
   配色：深蓝#0f3460(主) + 白 + 银灰，橙#E8650A仅CTA(≤4色)
   留白：区块间距≥100px，卡片内边距≥32px
   图标：SVG线性统一风格；层级：Hero→区块标题→卡片标题→正文
   ============================================================ */
* { margin:0; padding:0; box-sizing:border-box; }
:root{
  --primary:#0f3460;
  --primary-light:#1a4a82;
  --accent:#E8650A;
  --dark:#0c1f3d;
  --text:#1a1a2e;
  --text-light:#5a6b7d;
  --bg:#ffffff;
  --bg-light:#f6f8fb;
  --border:#e8edf3;
  --cyan:#1a9ec4;
  --radius:16px;
  --shadow:0 4px 20px rgba(15,52,96,0.06);
  --shadow-hover:0 16px 48px rgba(15,52,96,0.14);
}
html{scroll-behavior:smooth;}
body{font-family:'Microsoft YaHei','PingFang SC',-apple-system,sans-serif;color:var(--text);line-height:1.7;background:var(--bg);-webkit-font-smoothing:antialiased;}
.container{max-width:1200px;margin:0 auto;padding:0 32px;}

/* ===== 导航 ===== */
.nav{position:fixed;top:0;width:100%;background:rgba(255,255,255,0.92);backdrop-filter:blur(16px);z-index:100;border-bottom:1px solid rgba(15,52,96,0.06);transition:box-shadow .3s;}
.nav.scrolled{box-shadow:0 4px 24px rgba(15,52,96,0.08);}
.nav-inner{display:flex;justify-content:space-between;align-items:center;height:80px;}
.logo{display:flex;align-items:center;gap:12px;text-decoration:none;}
.logo img{height:44px;width:auto;}
.nav-links{display:flex;gap:36px;}
.nav-links a{text-decoration:none;color:#2c3e50;font-size:15px;font-weight:600;position:relative;transition:color .3s;}
.nav-links a:hover{color:var(--primary);}
.nav-links a::after{content:'';position:absolute;bottom:-6px;left:0;width:0;height:2px;background:var(--primary);transition:width .3s;}
.nav-links a:hover::after{width:100%;}
.nav-links a.active{color:var(--primary);}
.nav-links a.active::after{width:100%;}
.nav-cta{background:var(--accent);color:#fff;padding:12px 28px;border-radius:10px;text-decoration:none;font-weight:600;font-size:15px;transition:background .3s,transform .2s;box-shadow:0 4px 12px rgba(232,101,10,0.25);}
.nav-cta:hover{background:#d55a06;transform:translateY(-2px);}

/* ===== 页头（Hero） ===== */
.page-hero{padding:180px 0 110px;background:var(--dark);color:#fff;position:relative;overflow:hidden;}
.page-hero::before{content:'';position:absolute;top:-30%;right:-15%;width:700px;height:700px;background:radial-gradient(circle, rgba(26,74,130,0.35), transparent 65%);}
.page-hero::after{content:'';position:absolute;bottom:-40%;left:-10%;width:600px;height:600px;background:radial-gradient(circle, rgba(232,101,10,0.12), transparent 60%);}
.page-hero-inner{position:relative;z-index:1;max-width:820px;}
.breadcrumb{display:flex;gap:10px;align-items:center;font-size:13px;color:#8a9bb3;margin-bottom:28px;}
.breadcrumb a{color:#8a9bb3;text-decoration:none;transition:color .3s;}
.breadcrumb a:hover{color:#4FC3F7;}
.breadcrumb .sep{opacity:.5;}
.breadcrumb .cur{color:#4FC3F7;}
.page-hero h1{font-size:48px;font-weight:800;line-height:1.25;margin-bottom:20px;letter-spacing:-0.5px;}
.page-hero h1 .accent{background:linear-gradient(135deg,#4FC3F7,#7ec8ff);-webkit-background-clip:text;-webkit-text-fill-color:transparent;}
.page-hero p{font-size:18px;color:#9fb0c8;max-width:700px;line-height:1.9;margin-bottom:36px;}
.hero-tags{display:flex;gap:10px;flex-wrap:wrap;}
.hero-tag{display:inline-flex;align-items:center;gap:6px;padding:6px 16px;border-radius:40px;background:rgba(255,255,255,0.08);border:1px solid rgba(255,255,255,0.14);font-size:13px;color:#b8c6d8;}

/* ===== 通用区块 ===== */
.section{padding:110px 0;}
.section-head{text-align:center;margin-bottom:64px;}
.section-eyebrow{display:inline-block;font-size:13px;font-weight:700;letter-spacing:2px;color:var(--accent);text-transform:uppercase;margin-bottom:12px;}
.section-title{font-size:38px;font-weight:800;color:var(--primary);letter-spacing:-0.5px;line-height:1.3;}
.section-sub{color:var(--text-light);font-size:16px;margin-top:14px;}
.gray{background:var(--bg-light);}

/* ===== 产品卡片（总览页） ===== */
.prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;}
.prod-card{background:#fff;border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--shadow);padding:40px;display:flex;flex-direction:column;transition:transform .4s,box-shadow .4s;position:relative;overflow:hidden;}
.prod-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-hover);}
.prod-badge{position:absolute;top:20px;right:20px;font-size:12px;padding:4px 12px;border-radius:20px;font-weight:600;}
.prod-badge.live{background:#e6f4e9;color:#1e7d3c;}
.prod-badge.beta{background:#fdf0e7;color:var(--accent);}
.prod-icon{width:60px;height:60px;display:flex;align-items:center;justify-content:center;border-radius:14px;margin-bottom:22px;}
.prod-icon svg{width:30px;height:30px;}
.prod-icon.blue{background:#eef3fb;}
.prod-icon.blue svg{stroke:var(--primary);}
.prod-icon.orange{background:#fdf0e7;}
.prod-icon.orange svg{stroke:var(--accent);}
.prod-icon.cyan{background:#e6f4f9;}
.prod-icon.cyan svg{stroke:var(--cyan);}
.prod-icon.green{background:#e6f4e9;}
.prod-icon.green svg{stroke:#1e7d3c;}
.prod-card h3{font-size:24px;color:var(--primary);margin-bottom:10px;}
.prod-card .prod-desc{color:var(--text-light);font-size:15px;line-height:1.8;margin-bottom:18px;flex:1;}
.prod-price{display:inline-flex;align-items:center;padding:6px 16px;background:#eef3fb;color:var(--primary);border-radius:8px;font-size:14px;font-weight:600;margin-bottom:22px;}
.prod-tags{margin-bottom:26px;}
.prod-tag{display:inline-block;background:var(--bg-light);color:var(--text);padding:5px 12px;border-radius:8px;font-size:13px;margin:3px 3px 3px 0;border:1px solid var(--border);}
.prod-actions{display:flex;gap:12px;align-items:center;}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 30px;border-radius:12px;font-weight:600;text-decoration:none;font-size:15px;transition:all .3s;border:none;cursor:pointer;font-family:inherit;}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 8px 24px rgba(232,101,10,0.3);}
.btn-primary:hover{background:#d55a06;transform:translateY(-2px);box-shadow:0 12px 32px rgba(232,101,10,0.4);}
.btn-outline{border:2px solid var(--primary);color:var(--primary);background:transparent;}
.btn-outline:hover{background:var(--primary);color:#fff;transform:translateY(-2px);}
.btn-sm{padding:11px 22px;font-size:14px;border-radius:10px;}

/* ===== 详情页：双栏 ===== */
.detail-grid{display:grid;grid-template-columns:1fr 380px;gap:56px;align-items:start;}
.detail-main{min-width:0;}
.detail-side{position:sticky;top:110px;display:flex;flex-direction:column;gap:20px;}
.side-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px;}
.side-card h4{font-size:16px;color:var(--primary);margin-bottom:14px;}
.side-card .side-price{font-size:30px;font-weight:800;color:var(--primary);}
.side-card .side-price small{font-size:14px;font-weight:400;color:var(--text-light);}
.side-card .side-note{font-size:13px;color:var(--text-light);margin-top:6px;line-height:1.7;}
.side-point{display:flex;gap:10px;align-items:flex-start;font-size:14px;color:var(--text-light);padding:8px 0;border-bottom:1px dashed var(--border);}
.side-point:last-child{border-bottom:none;}
.side-point svg{flex-shrink:0;width:16px;height:16px;stroke:var(--accent);margin-top:4px;}
.side-card .btn{width:100%;margin-top:16px;}
.side-card .btn + .btn{margin-top:10px;}

/* ===== 详情正文 ===== */
.prose h2{font-size:26px;color:var(--primary);margin:56px 0 20px;padding-bottom:12px;border-bottom:2px solid var(--border);position:relative;}
.prose h2::after{content:'';position:absolute;left:0;bottom:-2px;width:48px;height:2px;background:var(--accent);}
.prose h2:first-child{margin-top:0;}
.prose p{color:var(--text-light);font-size:16px;line-height:2;margin-bottom:16px;}
.prose strong{color:var(--primary);}
.feat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin:24px 0;}
.feat-card{background:var(--bg-light);border:1px solid var(--border);border-radius:14px;padding:26px;}
.feat-card .feat-ic{width:44px;height:44px;display:flex;align-items:center;justify-content:center;border-radius:11px;background:#fff;margin-bottom:14px;}
.feat-card .feat-ic svg{width:22px;height:22px;stroke:var(--primary);}
.feat-card.alt .feat-ic svg{stroke:var(--accent);}
.feat-card h4{font-size:17px;color:var(--primary);margin-bottom:8px;}
.feat-card p{font-size:14px;color:var(--text-light);line-height:1.8;margin:0;}

/* 流程步骤 */
.steps{display:flex;gap:0;margin:32px 0;counter-reset:step;}
.step{flex:1;position:relative;padding:0 20px;text-align:center;}
.step::before{content:'';position:absolute;top:22px;left:50%;width:100%;height:2px;background:var(--border);z-index:0;}
.step:first-child::before{width:50%;left:50%;}
.step:last-child::before{width:50%;left:0;}
.step .step-num{position:relative;z-index:1;width:44px;height:44px;margin:0 auto 14px;border-radius:50%;background:var(--primary);color:#fff;font-weight:800;font-size:16px;display:flex;align-items:center;justify-content:center;}
.step h4{font-size:15px;color:var(--primary);margin-bottom:6px;}
.step p{font-size:13px;color:var(--text-light);margin:0;line-height:1.7;}

/* 数字/价值条 */
.metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin:28px 0;}
.metric{background:var(--dark);border-radius:14px;padding:28px 20px;text-align:center;color:#fff;}
.metric .num{font-size:32px;font-weight:800;color:#4FC3F7;}
.metric .lab{font-size:13px;color:#8a9bb3;margin-top:8px;}

/* ===== 套餐表 ===== */
.plan-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin:32px 0;}
.plan{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:36px 32px;position:relative;transition:transform .3s,box-shadow .3s;display:flex;flex-direction:column;}
.plan:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);}
.plan.hot{border:2px solid var(--accent);box-shadow:0 8px 32px rgba(232,101,10,0.15);}
.plan .plan-flag{position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:var(--accent);color:#fff;font-size:12px;font-weight:700;padding:4px 16px;border-radius:20px;white-space:nowrap;}
.plan h4{font-size:18px;color:var(--primary);margin-bottom:6px;}
.plan .plan-for{font-size:13px;color:var(--text-light);margin-bottom:18px;}
.plan .plan-price{font-size:34px;font-weight:800;color:var(--primary);margin-bottom:4px;}
.plan .plan-price small{font-size:14px;font-weight:400;color:var(--text-light);}
.plan .plan-unit{font-size:13px;color:var(--text-light);margin-bottom:20px;}
.plan ul{list-style:none;flex:1;margin-bottom:24px;}
.plan ul li{font-size:14px;color:var(--text-light);padding:7px 0 7px 26px;position:relative;line-height:1.7;}
.plan ul li::before{content:'';position:absolute;left:0;top:14px;width:8px;height:8px;border-radius:50%;background:var(--primary);}
.plan.hot ul li::before{background:var(--accent);}
.plan .btn{width:100%;}

/* ===== 订阅表单 ===== */
.sub-wrap{max-width:720px;margin:0 auto;background:#fff;border:1px solid var(--border);border-radius:20px;box-shadow:var(--shadow);padding:48px;}
.sub-form{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
.sub-form .full{grid-column:1/-1;}
.sub-form label{display:block;font-size:13px;font-weight:700;color:var(--primary);margin-bottom:6px;}
.sub-form label .req{color:var(--accent);}
.sub-form input,.sub-form select,.sub-form textarea{width:100%;padding:13px 16px;border:1px solid var(--border);border-radius:10px;font-size:15px;font-family:inherit;color:var(--text);background:#fff;transition:border-color .3s,box-shadow .3s;outline:none;}
.sub-form input:focus,.sub-form select:focus,.sub-form textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(15,52,96,0.08);}
.sub-form textarea{resize:vertical;min-height:90px;}
.sub-form .btn{grid-column:1/-1;margin-top:8px;padding:16px;}
.sub-ok{display:none;text-align:center;padding:24px 0;}
.sub-ok .ok-ic{width:64px;height:64px;margin:0 auto 18px;border-radius:50%;background:#e6f4e9;display:flex;align-items:center;justify-content:center;}
.sub-ok .ok-ic svg{width:30px;height:30px;stroke:#1e7d3c;}
.sub-ok h3{font-size:22px;color:var(--primary);margin-bottom:10px;}
.sub-ok p{color:var(--text-light);font-size:15px;line-height:1.9;margin-bottom:20px;}
.sub-ok .sub-copy{display:inline-flex;align-items:center;gap:8px;background:#eef3fb;color:var(--primary);border:1px solid var(--border);padding:12px 26px;border-radius:10px;font-weight:600;cursor:pointer;font-size:14px;transition:all .3s;font-family:inherit;}
.sub-ok .sub-copy:hover{border-color:var(--primary);}
.sub-hint{grid-column:1/-1;text-align:center;font-size:13px;color:#9aa8b8;margin-top:14px;}

/* ===== CTA ===== */
.cta{background:var(--dark);color:#fff;text-align:center;padding:110px 0;position:relative;overflow:hidden;}
.cta::before{content:'';position:absolute;top:-50%;left:50%;transform:translateX(-50%);width:800px;height:800px;background:radial-gradient(circle, rgba(26,74,130,0.3), transparent 60%);}
.cta-inner{position:relative;z-index:1;}
.cta h2{font-size:40px;margin-bottom:18px;font-weight:800;letter-spacing:-0.5px;}
.cta p{font-size:17px;color:#9fb0c8;margin-bottom:40px;}
.btn-white{background:#fff;color:var(--primary);box-shadow:0 8px 24px rgba(0,0,0,0.2);}
.btn-white:hover{transform:translateY(-2px);box-shadow:0 12px 32px rgba(0,0,0,0.3);}

/* ===== 页脚 ===== */
.footer{background:var(--dark);color:#8a9bb3;padding:72px 0 32px;font-size:14px;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:48px;margin-bottom:48px;}
.footer-brand .logo-text{font-size:20px;font-weight:700;color:#fff;margin-bottom:16px;}
.footer-brand p{color:#8a9bb3;line-height:1.8;font-size:14px;}
.footer-col h4{color:#fff;font-size:15px;font-weight:700;margin-bottom:16px;}
.footer-col a{display:block;color:#8a9bb3;text-decoration:none;margin-bottom:10px;font-size:14px;transition:color .3s;}
.footer-col a:hover{color:#4FC3F7;}
.footer-bottom{border-top:1px solid rgba(255,255,255,0.1);padding-top:24px;text-align:center;color:#6b7c93;font-size:13px;}
.footer-bottom p{margin:4px 0;}

/* ===== 响应式 ===== */
@media(max-width:1000px){
  .prod-grid{grid-template-columns:repeat(2,1fr);}
  .detail-grid{grid-template-columns:1fr;}
  .detail-side{position:static;}
  .metric-grid{grid-template-columns:repeat(2,1fr);}
}
@media(max-width:900px){
  .nav-links{display:none;}
  .page-hero{padding:140px 0 90px;}
  .page-hero h1{font-size:34px;}
  .section{padding:80px 0;}
  .section-title{font-size:30px;}
  .prod-grid{grid-template-columns:1fr;}
  .plan-grid{grid-template-columns:1fr;}
  .feat-grid{grid-template-columns:1fr;}
  .steps{flex-direction:column;gap:24px;}
  .step::before{display:none;}
  .sub-form{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr;gap:32px;}
}