/* ===== Reset & Base ===== */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Microsoft YaHei','PingFang SC',sans-serif;color:#333;line-height:1.6;background:#fff}
a{text-decoration:none;color:inherit}
ul{list-style:none}
img{max-width:100%;display:block}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}

/* ===== Colors - 青蓝色主题 ===== */
:root{
    --primary:#0891b2;      /* 青蓝主色 */
    --primary-dark:#164e63; /* 深青蓝 */
    --primary-light:#06b6d4;/* 浅青蓝 */
    --accent:#f97316;       /* 橙色强调 */
    --dark:#0f172a;
    --gray:#64748b;
    --light:#f0fdfa;
}

/* ===== Top Bar ===== */
.top-bar{background:var(--dark);color:#fff;font-size:13px;padding:8px 0}
.top-bar .container{display:flex;justify-content:space-between;align-items:center}
.top-bar-left span{margin-right:24px}
.top-bar-right a{margin-left:12px;color:rgba(255,255,255,0.7);transition:.3s}
.top-bar-right a:hover{color:#fff}

/* ===== Header ===== */
.header{background:#fff;box-shadow:0 2px 20px rgba(0,0,0,0.08);position:sticky;top:0;z-index:1000}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 24px;max-width:1200px;margin:0 auto}
.logo{display:flex;align-items:center;gap:12px}
.logo-icon svg{transition:transform .3s}
.logo:hover .logo-icon svg{transform:scale(1.05)}
.logo-text{display:flex;flex-direction:column}
.logo-cn{font-size:24px;font-weight:900;color:var(--primary-dark);letter-spacing:2px}
.logo-en{font-size:10px;color:var(--gray);letter-spacing:3px}
.nav{display:flex;gap:8px}
.nav-link{padding:12px 18px;font-size:15px;color:var(--dark);font-weight:500;transition:.3s;position:relative}
.nav-link::after{content:'';position:absolute;bottom:0;left:50%;width:0;height:2px;background:var(--primary);transition:.3s;transform:translateX(-50%)}
.nav-link:hover::after,.nav-link.active::after{width:80%}
.nav-link:hover,.nav-link.active{color:var(--primary)}
.nav-search{display:flex;align-items:center;border:1px solid #e2e8f0;border-radius:8px;overflow:hidden}
.nav-search input{border:none;outline:none;padding:8px 12px;width:160px;font-size:13px}
.nav-search button{border:none;background:var(--primary);color:#fff;padding:8px 12px;cursor:pointer}

/* ===== Hero Banner ===== */
.hero{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 60%,#0f172a 100%);min-height:600px;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");opacity:.5}
.hero-inner{display:flex;align-items:center;justify-content:space-between;min-height:600px;position:relative;z-index:1}
.hero-content{max-width:600px}
.hero-title{font-size:56px;font-weight:900;color:#fff;line-height:1.2;margin-bottom:24px;text-shadow:0 4px 20px rgba(0,0,0,0.2)}
.hero-subtitle{font-size:20px;color:rgba(255,255,255,0.9);margin-bottom:36px;line-height:1.8}
.hero-btns{display:flex;gap:16px}
.btn{padding:14px 32px;font-size:16px;font-weight:600;border-radius:8px;transition:.3s;cursor:pointer;display:inline-block;border:2px solid transparent}
.btn-primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn-primary:hover{background:#ea580c;transform:translateY(-2px);box-shadow:0 8px 24px rgba(249,115,22,0.4)}
.btn-outline{background:transparent;color:#fff;border-color:#fff}
.btn-outline:hover{background:#fff;color:var(--primary)}
.hero-product{flex-shrink:0}
.product-showcase{position:relative}
.product-badge{position:absolute;bottom:40px;right:-20px;background:var(--accent);color:#fff;padding:12px 24px;font-size:18px;font-weight:700;border-radius:8px;box-shadow:0 8px 24px rgba(249,115,22,0.4)}
.hero-dots{position:absolute;bottom:30px;left:50%;transform:translateX(-50%);display:flex;gap:8px;z-index:2}
.dot{width:10px;height:10px;border-radius:50%;background:rgba(255,255,255,0.4);cursor:pointer}
.dot.active{background:#fff;width:32px;border-radius:5px}

/* ===== Section Headers ===== */
.section-header{text-align:center;margin-bottom:60px}
.section-title{font-size:40px;font-weight:900;color:var(--primary-dark);margin-bottom:16px}
.section-desc{font-size:18px;color:var(--gray)}

/* ===== Products ===== */
.products{padding:100px 0;background:#f8fafc}
.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.product-card{background:#fff;border-radius:16px;overflow:hidden;box-shadow:0 4px 24px rgba(0,0,0,0.06);transition:.4s;cursor:pointer}
.product-card:hover{transform:translateY(-8px);box-shadow:0 16px 48px rgba(8,145,178,0.2)}
.product-card-img{height:180px;display:flex;align-items:center;justify-content:center;position:relative}
.product-card-body{padding:24px}
.product-card-body h3{font-size:22px;font-weight:700;color:var(--primary-dark);margin-bottom:8px}
.product-card-body p{font-size:14px;color:var(--gray);line-height:1.6;margin-bottom:16px}
.product-link{color:var(--primary);font-weight:600;font-size:14px;transition:.3s}
.product-link:hover{color:var(--accent)}

/* ===== Advantages ===== */
.advantages{padding:100px 0;background:linear-gradient(135deg,var(--primary-dark) 0%,var(--dark) 100%);position:relative}
.advantages::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-9-21c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM60 91c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM35 41c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2z' fill='%23ffffff' fill-opacity='0.03' fill-rule='evenodd'/%3E%3C/svg%3E")}
.adv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;position:relative;z-index:1}
.adv-item{text-align:center;padding:40px 24px;background:rgba(255,255,255,0.05);border-radius:16px;border:1px solid rgba(255,255,255,0.1);transition:.3s}
.adv-item:hover{background:rgba(255,255,255,0.1);transform:translateY(-4px)}
.adv-icon{font-size:48px;margin-bottom:20px}
.adv-item h3{font-size:22px;font-weight:700;color:#fff;margin-bottom:12px}
.adv-item p{font-size:14px;color:rgba(255,255,255,0.7);line-height:1.6}

/* ===== Applications ===== */
.applications{padding:100px 0;background:#fff}
.app-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.app-card{border-radius:16px;overflow:hidden;box-shadow:0 4px 24px rgba(0,0,0,0.06);transition:.4s;cursor:pointer}
.app-card:hover{transform:translateY(-8px);box-shadow:0 16px 48px rgba(0,0,0,0.12)}
.app-img{height:160px;display:flex;align-items:center;justify-content:center;position:relative}
.app-icon{font-size:56px}
.app-card h3{font-size:18px;font-weight:700;color:var(--primary-dark);padding:20px 20px 8px}
.app-card p{font-size:14px;color:var(--gray);padding:0 20px 20px;line-height:1.6}

/* ===== About ===== */
.about{padding:100px 0;background:var(--light)}
.about-inner{display:flex;gap:60px;align-items:center}
.about-text{flex:1}
.about-desc{font-size:16px;color:var(--gray);line-height:1.8;margin-bottom:20px}
.about-stats{display:flex;gap:48px;margin-top:32px;padding-top:32px;border-top:1px solid #e2e8f0}
.stat{text-align:center}
.stat-num{font-size:40px;font-weight:900;color:var(--primary);display:block}
.stat-label{font-size:14px;color:var(--gray);margin-top:4px}
.about-img{flex:1}
.about-img>div{box-shadow:0 24px 64px rgba(8,145,178,0.2)}

/* ===== News ===== */
.news{padding:100px 0;background:#f8fafc}
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-card{display:flex;gap:20px;background:#fff;padding:24px;border-radius:12px;box-shadow:0 4px 24px rgba(0,0,0,0.06);transition:.3s;cursor:pointer}
.news-card:hover{box-shadow:0 8px 32px rgba(0,0,0,0.1)}
.news-date{min-width:60px;text-align:center}
.news-day{font-size:32px;font-weight:900;color:var(--primary);display:block;line-height:1}
.news-month{font-size:12px;color:var(--gray);margin-top:4px}
.news-body h3{font-size:16px;font-weight:600;color:var(--dark);margin-bottom:8px;line-height:1.4}
.news-body h3 a:hover{color:var(--primary)}
.news-body p{font-size:13px;color:var(--gray);line-height:1.6}

/* ===== Contact ===== */
.contact{padding:100px 0;background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);position:relative}
.contact .section-title{color:#fff}
.contact .section-desc{color:rgba(255,255,255,0.8)}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px}
.contact-info{display:flex;flex-direction:column;gap:24px}
.contact-item{display:flex;gap:20px;align-items:flex-start;background:rgba(255,255,255,0.1);padding:24px;border-radius:12px;transition:.3s}
.contact-item:hover{background:rgba(255,255,255,0.15)}
.contact-icon{font-size:32px;flex-shrink:0}
.contact-item h4{font-size:14px;color:rgba(255,255,255,0.7);margin-bottom:4px}
.contact-item p{font-size:18px;color:#fff;font-weight:600}
.contact-form-wrap{background:#fff;padding:40px;border-radius:16px;box-shadow:0 24px 64px rgba(0,0,0,0.2)}
.contact-form h3{font-size:24px;font-weight:700;color:var(--primary-dark);margin-bottom:24px;text-align:center}
.form-row{display:flex;gap:16px}
.contact-form input,.contact-form textarea{width:100%;padding:14px 16px;border:1px solid #e2e8f0;border-radius:8px;font-size:14px;margin-bottom:16px;outline:none;transition:.3s;font-family:inherit}
.contact-form input:focus,.contact-form textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(8,145,178,0.1)}
.contact-form textarea{resize:vertical}

/* ===== Footer ===== */
.footer{background:var(--dark);color:#fff;padding:60px 0 0}
.footer-inner{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:48px;padding-bottom:48px}
.footer-col h4{font-size:16px;font-weight:600;margin-bottom:20px;color:#fff}
.footer-col a{display:block;font-size:14px;color:rgba(255,255,255,0.6);margin-bottom:12px;transition:.3s}
.footer-col a:hover{color:var(--primary-light)}
.footer-col p{font-size:14px;color:rgba(255,255,255,0.6);margin-bottom:12px}
.footer-bottom{background:rgba(255,255,255,0.05);padding:20px 0;text-align:center;border-top:1px solid rgba(255,255,255,0.1)}
.footer-bottom p{font-size:13px;color:rgba(255,255,255,0.5)}
.footer-bottom a{color:rgba(255,255,255,0.7);transition:.3s}
.footer-bottom a:hover{color:var(--primary-light)}

/* ===== Back to Top ===== */
.back-to-top{position:fixed;right:30px;bottom:30px;width:48px;height:48px;background:var(--primary);color:#fff;font-size:20px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 4px 16px rgba(8,145,178,0.4);transition:.3s;opacity:0;pointer-events:none;z-index:999}
.back-to-top.show{opacity:1;pointer-events:auto}
.back-to-top:hover{background:var(--primary-dark);transform:translateY(-4px)}

/* ===== Responsive ===== */
@media(max-width:1024px){
    .product-grid,.adv-grid,.app-grid{grid-template-columns:repeat(2,1fr)}
    .about-inner{flex-direction:column}
    .news-grid{grid-template-columns:1fr}
    .contact-grid{grid-template-columns:1fr}
    .footer-inner{grid-template-columns:repeat(2,1fr)}
    .hero-title{font-size:40px}
}
@media(max-width:768px){
    .nav{display:none}
    .hero-inner{flex-direction:column;text-align:center;padding-top:60px}
    .hero-title{font-size:32px}
    .hero-btns{justify-content:center;flex-wrap:wrap}
    .product-grid,.adv-grid,.app-grid{grid-template-columns:1fr}
    .hero-product{order:-1;margin-bottom:40px}
    .section-title{font-size:28px}
    .about-stats{flex-wrap:wrap;gap:24px}
}