*{margin:0;padding:0;box-sizing:border-box}
:root{
  --primary:#1a56db;
  --primary-dark:#1e40af;
  --primary-light:#3b82f6;
  --text:#1f2937;
  --text-light:#6b7280;
  --bg:#f8fafc;
  --white:#ffffff;
  --border:#e5e7eb;
  --shadow:0 2px 8px rgba(0,0,0,0.08);
  --shadow-lg:0 4px 16px rgba(0,0,0,0.12);
}
body{font-family:-apple-system,"Microsoft YaHei","微软雅黑","PingFang SC","Helvetica Neue",sans-serif;color:var(--text);background:var(--bg);line-height:1.8;font-size:16px}
a{color:var(--primary);text-decoration:none;transition:color .3s}
a:hover{color:var(--primary-dark)}
img{max-width:100%;height:auto;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* Header */
.header{background:var(--white);box-shadow:var(--shadow);position:sticky;top:0;z-index:100}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{font-size:24px;font-weight:700;color:var(--primary);letter-spacing:2px}
.logo:hover{color:var(--primary-dark)}
.nav{display:flex;gap:32px;list-style:none}
.nav a{color:var(--text);font-size:15px;font-weight:500;padding:8px 0;position:relative}
.nav a:hover,.nav a.active{color:var(--primary)}
.nav a.active::after{content:"";position:absolute;bottom:0;left:0;right:0;height:2px;background:var(--primary);border-radius:1px}
.menu-btn{display:none;background:none;border:none;font-size:24px;cursor:pointer;color:var(--text)}

/* Hero */
.hero{background:linear-gradient(135deg,#1a56db 0%,#3b82f6 50%,#60a5fa 100%);color:#fff;padding:80px 0;text-align:center}
.hero h1{font-size:42px;margin-bottom:16px;font-weight:700;letter-spacing:2px}
.hero p{font-size:18px;opacity:.9;max-width:600px;margin:0 auto 32px}
.hero-btn{display:inline-block;background:#fff;color:var(--primary);padding:14px 36px;border-radius:6px;font-weight:600;font-size:16px;transition:all .3s;margin:0 8px}
.hero-btn:hover{background:var(--primary);color:#fff;transform:translateY(-2px);box-shadow:0 4px 12px rgba(0,0,0,.2)}
.hero-btn--outline{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.8)}
.hero-btn--outline:hover{background:rgba(255,255,255,.15);border-color:#fff;color:#fff;transform:translateY(-2px);box-shadow:0 4px 12px rgba(0,0,0,.2)}

/* Section */
.section{padding:64px 0}
.section-title{text-align:center;font-size:28px;font-weight:700;margin-bottom:12px;color:var(--text)}
.section-desc{text-align:center;color:var(--text-light);margin-bottom:48px;font-size:16px}

/* Product Grid */
.product-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.product-card{background:var(--white);border-radius:8px;overflow:hidden;box-shadow:var(--shadow);transition:all .3s}
.product-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.product-img{height:200px;background:linear-gradient(135deg,#e0e7ff,#dbeafe);display:flex;align-items:center;justify-content:center;font-size:48px;color:var(--primary)}
.product-info{padding:20px}
.product-info h3{font-size:18px;margin-bottom:8px}
.product-info p{color:var(--text-light);font-size:14px;line-height:1.6}
.product-price{color:#dc2626;font-size:18px;font-weight:700;margin-top:12px}

/* Feature */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:32px}
.feature-card{text-align:center;padding:32px 20px;background:var(--white);border-radius:8px;box-shadow:var(--shadow)}
.feature-icon{width:64px;height:64px;margin:0 auto 16px;background:linear-gradient(135deg,var(--primary),var(--primary-light));border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:28px;color:#fff}
.feature-card h3{font-size:18px;margin-bottom:8px}
.feature-card p{color:var(--text-light);font-size:14px}

/* Breadcrumb */
.breadcrumb{padding:16px 0;font-size:14px;color:var(--text-light);border-bottom:1px solid var(--border);background:var(--white)}
.breadcrumb a{color:var(--text-light)}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb span{margin:0 8px;color:#d1d5db}

/* About */
.about-content{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.about-text h2{font-size:28px;margin-bottom:16px}
.about-text p{color:var(--text-light);margin-bottom:16px;line-height:2}
.about-img{height:360px;background:linear-gradient(135deg,#e0e7ff,#dbeafe);border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:64px;color:var(--primary)}

/* Stats */
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:48px}
.stat-card{text-align:center;padding:32px 16px;background:var(--white);border-radius:8px;box-shadow:var(--shadow)}
.stat-number{font-size:36px;font-weight:700;color:var(--primary);margin-bottom:8px}
.stat-label{color:var(--text-light);font-size:14px}

/* News */
.news-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(350px,1fr));gap:24px}
.news-card{background:var(--white);border-radius:8px;overflow:hidden;box-shadow:var(--shadow);transition:all .3s}
.news-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.news-img{height:180px;background:linear-gradient(135deg,#e0e7ff,#dbeafe);display:flex;align-items:center;justify-content:center;font-size:36px;color:var(--primary)}
.news-body{padding:20px}
.news-date{font-size:13px;color:var(--text-light);margin-bottom:8px}
.news-body h3{font-size:18px;margin-bottom:8px;line-height:1.5}
.news-body p{color:var(--text-light);font-size:14px;line-height:1.6}

/* Article */
.article-header{margin-bottom:32px;padding-bottom:24px;border-bottom:1px solid var(--border)}
.article-header h1{font-size:28px;line-height:1.5;margin-bottom:12px}
.article-meta{display:flex;gap:24px;color:var(--text-light);font-size:14px}
.article-content{background:var(--white);padding:40px;border-radius:8px;box-shadow:var(--shadow);line-height:2;font-size:16px}
.article-content h2{font-size:22px;margin:32px 0 16px;color:var(--text)}
.article-content h3{font-size:18px;margin:24px 0 12px;color:var(--text)}
.article-content p{margin-bottom:16px;color:#374151}
.article-content ul,.article-content ol{margin:16px 0;padding-left:24px}
.article-content li{margin-bottom:8px}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px}
.contact-info h2{font-size:24px;margin-bottom:24px}
.contact-item{display:flex;gap:16px;margin-bottom:24px;align-items:flex-start}
.contact-icon{width:48px;height:48px;background:linear-gradient(135deg,var(--primary),var(--primary-light));border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:20px;color:#fff;flex-shrink:0}
.contact-item h4{font-size:16px;margin-bottom:4px}
.contact-item p{color:var(--text-light);font-size:14px}
.contact-form{background:var(--white);padding:32px;border-radius:8px;box-shadow:var(--shadow)}
.form-group{margin-bottom:20px}
.form-group label{display:block;margin-bottom:6px;font-weight:500;font-size:14px}
.form-group input,.form-group textarea,.form-group select{width:100%;padding:12px 16px;border:1px solid var(--border);border-radius:6px;font-size:14px;font-family:inherit;transition:border-color .3s;background:var(--white)}
.form-group input:focus,.form-group textarea:focus,.form-group select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(26,86,219,.1)}
.form-group textarea{height:120px;resize:vertical}
.btn{display:inline-block;background:var(--primary);color:#fff;padding:12px 32px;border:none;border-radius:6px;font-size:16px;font-weight:600;cursor:pointer;transition:all .3s;font-family:inherit}
.btn:hover{background:var(--primary-dark);color:#fff;transform:translateY(-1px)}
.btn-block{width:100%;text-align:center}

/* Footer */
.footer{background:#111827;color:#9ca3af;padding:48px 0 24px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:48px;margin-bottom:32px}
.footer h4{color:#fff;font-size:16px;margin-bottom:16px}
.footer p{font-size:14px;line-height:1.8}
.footer ul{list-style:none}
.footer li{margin-bottom:8px}
.footer a{color:#9ca3af;font-size:14px}
.footer a:hover{color:#fff}
.footer-bottom{border-top:1px solid #374151;padding-top:24px;text-align:center;font-size:13px;color:#6b7280}
.footer-bottom a{color:#6b7280}
.footer-bottom a:hover{color:#9ca3af}

/* Back to top */
.back-top{position:fixed;bottom:32px;right:32px;width:44px;height:44px;background:var(--primary);color:#fff;border:none;border-radius:50%;font-size:18px;cursor:pointer;box-shadow:var(--shadow-lg);opacity:0;visibility:hidden;transition:all .3s;z-index:99}
.back-top.show{opacity:1;visibility:visible}
.back-top:hover{background:var(--primary-dark);transform:translateY(-2px)}

/* Responsive */
@media(max-width:768px){
  .menu-btn{display:block}
  .nav{display:none;position:absolute;top:72px;left:0;right:0;background:var(--white);flex-direction:column;padding:16px 20px;gap:0;box-shadow:var(--shadow)}
  .nav.open{display:flex}
  .nav li{border-bottom:1px solid var(--border)}
  .nav a{display:block;padding:12px 0}
  .nav a.active::after{display:none}
  .hero{padding:48px 0}
  .hero h1{font-size:28px}
  .hero p{font-size:15px}
  .section{padding:40px 0}
  .section-title{font-size:22px}
  .about-content,.contact-grid{grid-template-columns:1fr}
  .about-img{height:200px}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px}
  .news-grid{grid-template-columns:1fr}
  .article-content{padding:20px}
  .article-header h1{font-size:22px}
  .product-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}
}
@media(max-width:480px){
  .stats-grid{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero h1{font-size:24px}
  .feature-grid{grid-template-columns:1fr}
}