@charset "utf-8";
*{margin:0;padding:0;box-sizing:border-box}
html,body{font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;color:#333;font-size:14px;line-height:1.6}
a{color:#333;text-decoration:none;transition:all 0.3s ease}
a:hover{color:#1976d2}
img{max-width:100%;display:block}
ul,ol{list-style:none}

/* 容器 */
.container{width:1200px;margin:0 auto;padding:0 20px}

/* 头部 */
.header{position:fixed;top:0;left:0;right:0;z-index:1000;background:#fff;box-shadow:0 2px 10px rgba(0,0,0,0.1);height:70px}
.header-wrap{max-width:1200px;margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between;height:100%}
.logo img{height:50px}
.nav{margin-left:auto}
.nav-list{display:flex;gap:30px}
.nav-list li{position:relative}
.nav-list li a{padding:5px 0;font-size:15px;color:#333;position:relative;display:block}
.nav-list li a:hover{color:#1976d2}
.nav-list li .submenu{display:none;position:absolute;top:100%;left:0;background:#fff;border-radius:8px;box-shadow:0 4px 20px rgba(0,0,0,0.15);padding:10px 0;min-width:160px;z-index:1001;border-top:2px solid #1976d2}
.nav-list li:hover .submenu{display:block}
.nav-list li .submenu li{display:block;padding:0}
.nav-list li .submenu li a{padding:10px 20px;font-size:14px;color:#555;white-space:nowrap}
.nav-list li .submenu li a:hover{background:#f5f5f5;color:#1976d2}
.header-contact{color:#1976d2;font-size:16px;font-weight:500}

/* Hero区域 */
.hero{position:relative;height:100vh;min-height:600px;display:flex;align-items:center;justify-content:center;margin-top:70px;overflow:hidden}
.hero-bg{position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(135deg,#0d47a1 0%,#1976d2 50%,#42a5f5 100%)}
.hero-bg::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='0.05'%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")}
.hero-content{position:relative;z-index:1;text-align:center;color:#fff;padding:40px}
.hero-tag{display:inline-block;background:rgba(255,255,255,0.2);padding:8px 24px;border-radius:30px;font-size:14px;margin-bottom:30px;backdrop-filter:blur(10px)}
.hero-title{font-size:56px;font-weight:700;margin-bottom:20px;text-shadow:0 2px 10px rgba(0,0,0,0.2)}
.hero-desc{font-size:20px;opacity:0.9;margin-bottom:40px;max-width:600px;margin-left:auto;margin-right:auto}
.hero-btns{display:flex;gap:20px;justify-content:center}
.btn{padding:14px 36px;border-radius:8px;font-size:16px;font-weight:500;transition:all 0.3s ease;cursor:pointer}
.btn-primary{background:#fff;color:#1976d2}
.btn-primary:hover{background:#f0f0f0;transform:translateY(-2px);box-shadow:0 10px 30px rgba(0,0,0,0.2)}
.btn-outline{background:transparent;border:2px solid #fff;color:#fff}
.btn-outline:hover{background:rgba(255,255,255,0.1)}

/* 通用区块 */
.section{padding:80px 0}
.section-header{text-align:center;margin-bottom:60px}
.section-tag{display:inline-block;background:linear-gradient(135deg,#0d47a1,#1976d2);color:#fff;padding:6px 20px;border-radius:20px;font-size:13px;margin-bottom:15px}
.section-title{font-size:36px;font-weight:700;color:#1a1a1a;margin-bottom:15px}
.section-subtitle{font-size:16px;color:#666;max-width:600px;margin:0 auto}
.section-header.light .section-title{color:#fff}
.section-header.light .section-subtitle{color:rgba(255,255,255,0.8)}

/* AI平台 */
.ai-platform{background:#f8f9fa}
.ai-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px;max-width:1000px;margin:0 auto}
.ai-card{background:#fff;padding:40px 30px;border-radius:16px;text-align:center;box-shadow:0 5px 20px rgba(0,0,0,0.05);transition:all 0.3s ease}
.ai-card:hover{transform:translateY(-10px);box-shadow:0 20px 40px rgba(0,0,0,0.1)}
.ai-icon{width:80px;height:80px;margin:0 auto 20px;background:linear-gradient(135deg,#0d47a1,#1976d2);border-radius:50%;display:flex;align-items:center;justify-content:center}
.ai-icon img{width:40px;height:40px;filter:brightness(0) invert(1)}
.ai-card h4{font-size:20px;font-weight:600;margin-bottom:12px;color:#1a1a1a}
.ai-card p{font-size:14px;color:#666;line-height:1.8}

/* 产品服务 */
.products{background:#fff}
.product-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px}
.product-card{background:#fff;border-radius:16px;padding:30px;text-align:center;border:1px solid #eee;transition:all 0.3s ease}
.product-card:hover{border-color:#1976d2;box-shadow:0 10px 30px rgba(25,118,210,0.1)}
.product-icon{width:100px;height:100px;margin:0 auto 20px;background:linear-gradient(135deg,#e3f2fd,#bbdefb);border-radius:20px;display:flex;align-items:center;justify-content:center}
.product-icon img{width:60px;height:60px}
.product-card h4{font-size:18px;font-weight:600;margin-bottom:10px;color:#1a1a1a}
.product-card p{font-size:14px;color:#666}

/* 解决方案 */
.solutions{background:linear-gradient(135deg,#0d47a1,#1565c0)}
.solution-tabs{display:flex;justify-content:center;gap:20px;margin-bottom:40px}
.solution-tab{padding:12px 30px;background:rgba(255,255,255,0.1);color:#fff;border-radius:30px;cursor:pointer;transition:all 0.3s ease;font-size:15px}
.solution-tab.active{background:#fff;color:#1976d2}
.solution-tab:hover:not(.active){background:rgba(255,255,255,0.2)}
.solution-content{}
.solution-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;max-width:800px;margin:0 auto}
.solution-card{display:block;background:rgba(255,255,255,0.1);padding:30px;border-radius:12px;transition:all 0.3s ease;backdrop-filter:blur(10px)}
.solution-card:hover{background:rgba(255,255,255,0.2);transform:translateY(-3px)}
.solution-card h5{font-size:18px;color:#fff;margin-bottom:8px}
.solution-card p{font-size:14px;color:rgba(255,255,255,0.8)}

/* 客户案例 */
.cases{background:#f8f9fa}
.case-logos{display:flex;flex-wrap:wrap;justify-content:center;gap:20px;margin-bottom:50px}
.logo-item{padding:15px 30px;background:#fff;border-radius:8px;font-size:14px;color:#666;box-shadow:0 2px 10px rgba(0,0,0,0.05)}
.case-studies{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.case-study{background:#fff;padding:30px;border-radius:16px;box-shadow:0 5px 20px rgba(0,0,0,0.05)}
.case-tag{font-size:13px;color:#1976d2;margin-bottom:10px}
.case-stat{font-size:28px;font-weight:700;color:#1a1a1a;margin-bottom:15px}
.case-stat strong{color:#1976d2}
.case-study p{font-size:14px;color:#666;line-height:1.8}

/* 研究院 */
.research{background:#fff}
.research-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;margin-bottom:50px}
.research-card{background:#f8f9fa;padding:30px;border-radius:12px;transition:all 0.3s ease}
.research-card:hover{background:#e3f2fd}
.research-card h5{font-size:16px;font-weight:600;color:#1a1a1a;margin-bottom:10px}
.research-card p{font-size:14px;color:#666;line-height:1.6}
.research-publications{background:#f8f9fa;padding:40px;border-radius:16px}
.research-publications h4{font-size:20px;font-weight:600;color:#1a1a1a;margin-bottom:10px}
.pub-subtitle{font-size:14px;color:#666;margin-bottom:25px}
.publication-list{display:flex;flex-direction:column;gap:15px}
.publication-item{display:flex;align-items:center;justify-content:space-between;padding:15px 20px;background:#fff;border-radius:8px;transition:all 0.3s ease}
.publication-item:hover{box-shadow:0 5px 15px rgba(0,0,0,0.1)}
.pub-title{font-size:15px;color:#333}
.pub-date{font-size:13px;color:#999}
.pub-type{display:inline-block;padding:4px 12px;background:#e3f2fd;color:#1976d2;border-radius:12px;font-size:12px}

/* 关于我们 */
.about{background:linear-gradient(135deg,#0d47a1,#1565c0);color:#fff}
.about-content{text-align:center}
.about-tabs{display:flex;justify-content:center;gap:30px;margin:30px 0}
.about-tab{padding:8px 0;font-size:15px;cursor:pointer;opacity:0.7;transition:all 0.3s ease;border-bottom:2px solid transparent}
.about-tab.active{opacity:1;border-color:#fff}
.about-text{max-width:800px;margin:30px auto 0;font-size:15px;line-height:2;text-align:left}
.about-text p{margin-bottom:20px;opacity:0.9}
.about-stats{display:flex;justify-content:center;gap:80px;margin-top:50px}
.stat-item{text-align:center}
.stat-num{display:block;font-size:48px;font-weight:700;margin-bottom:5px}
.stat-label{font-size:14px;opacity:0.8}

/* 联系区块 */
.contact{background:#fff}
.contact-cta{text-align:center;padding:60px;background:linear-gradient(135deg,#0d47a1,#1976d2);border-radius:20px;color:#fff}
.contact-cta h3{font-size:32px;font-weight:700;margin-bottom:15px}
.contact-cta p{font-size:16px;opacity:0.9;margin-bottom:20px}
.contact-tel{display:inline-block;font-size:28px;font-weight:700;color:#fff}

/* 页脚 */
.footer{background:#1a1a1a;color:#fff;padding:50px 0 30px}
.footer-main{display:flex;justify-content:space-between;margin-bottom:40px}
.footer-brand{max-width:400px}
.footer-logo{width:60px;height:60px;background:linear-gradient(135deg,#0d47a1,#1976d2);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:30px;font-weight:700;margin-bottom:15px}
.footer-brand h4{font-size:20px;font-weight:600;margin-bottom:10px}
.footer-brand p{font-size:14px;opacity:0.7;line-height:1.8}
.footer-contact{text-align:right}
.footer-contact p{font-size:14px;margin-bottom:8px;opacity:0.7}
.footer-bottom{text-align:center;padding-top:30px;border-top:1px solid rgba(255,255,255,0.1);font-size:13px;opacity:0.6}

/* 响应式 */
@media (max-width:1200px) {
.product-grid{grid-template-columns:repeat(2,1fr)}
.research-grid{grid-template-columns:repeat(2,1fr)}
.case-studies{grid-template-columns:repeat(2,1fr)}
.about-stats{gap:50px}
}
@media (max-width:768px) {
.hero-title{font-size:36px}
.hero-desc{font-size:16px}
.ai-grid,.product-grid,.research-grid{grid-template-columns:1fr}
.case-studies{grid-template-columns:1fr}
.solution-grid{grid-template-columns:1fr}
.about-stats{flex-direction:column;gap:30px}
.nav{display:none}
.footer-main{flex-direction:column;gap:30px}
.footer-contact{text-align:left}
}