*{
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "Microsoft Yahei", sans-serif;
        }
        :root{
            --main: #4F46E5;
            --main-light: #818CF8;
            --dark: #0F172A;
            --gray: #64748B;
            --light: #F8FAFC;
            --white: #FFFFFF;
        }
        body{
            background: var(--light);
            color: var(--dark);
            line-height: 1.8;
        }
        a{
            text-decoration: none;
        }
        /* 全局宽屏容器 */
        .wrap-full{
            width: 100%;
        }
        .container{
            width: 100%;
            max-width: 1920px;
            margin: 0 auto;
            padding: 80px 40px;
        }
        /* 导航栏 */
        .header{
            width: 100%;
            background: var(--white);
            box-shadow: 0 2px 20px rgba(0,0,0,0.06);
            position: fixed;
            top: 0;
            z-index: 999;
        }
        .nav-box{
            width: 100%;
            max-width: 1920px;
            margin: 0 auto;
            padding: 0 40px;
            height: 75px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .logo{
            font-size: 26px;
            font-weight: 700;
            color: var(--main);
        }
        .logo span{
            color: var(--dark);
        }
        .nav-menu a{
            margin-left: 35px;
            color: var(--dark);
            font-size: 16px;
            transition: 0.3s;
        }
        .nav-menu a:hover{
            color: var(--main);
        }
        /* 全屏宽屏Banner */
        .banner{
            width: 100%;
            height: 50vh;
            margin-top: 75px;
            background: linear-gradient(135deg, rgba(79,70,229,0.92), rgba(129,140,248,0.92)),
            url(https://geo.comcuz.com/images/1-1920x1080.jpg);
            background-size: cover;
            background-position: center;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            color: #fff;
        }
        .banner-text h1{
            font-size: 56px;
            margin-bottom: 25px;
            letter-spacing: 2px;
        }
        .banner-text p{
            font-size: 20px;
            max-width: 1200px;
            margin: 0 auto 40px;
            opacity: 0.95;
        }
        .btn{
            padding: 14px 36px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 16px;
            transition: 0.3s;
            display: inline-block;
            margin: 0 10px;
        }
        .btn-primary{
            background: #fff;
            color: var(--main);
        }
        .btn-outline{
            border: 2px solid #fff;
            color: #fff;
            background: transparent;
        }
        .btn:hover{
            transform: translateY(-6px);
            box-shadow: 0 15px 35px rgba(0,0,0,0.15);
        }
        /* 区块标题 */
        .sec-title{
            text-align: center;
            margin-bottom: 60px;
        }
        .sec-title h2{
            font-size: 36px;
            color: var(--dark);
            margin-bottom: 12px;
        }
        .sec-title p{
            color: var(--gray);
            font-size: 17px;
        }
        /* 图文左右布局 */
        .row-flex{
            display: flex;
            align-items: center;
            gap: 60px;
            flex-wrap: wrap;
        }
        .col-50{
            flex: 1;
            min-width: 480px;
        }
        .col-50 img{
            width: 100%;
            border-radius: 20px;
            box-shadow: 0 10px 40px rgba(0,0,0,0.08);
        }
        .text-box h3{
            font-size: 28px;
            margin-bottom: 20px;
            color: var(--main);
        }
        .text-box p{
            color: var(--gray);
            font-size: 16px;
            margin-bottom: 15px;
        }
        /* 卡片图文模块 */
        .grid-card{
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 35px;
            margin-top: 20px;
        }
        .item-card{
            background: var(--white);
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 8px 30px rgba(0,0,0,0.05);
            transition: 0.3s;
        }
        .item-card:hover{
            transform: translateY(-10px);
        }
        .item-card img{
            width: 100%;
            height: 220px;
            object-fit: cover;
        }
        .item-content{
            padding: 25px;
        }
        .item-content h4{
            font-size: 20px;
            margin-bottom: 12px;
        }
        .item-content p{
            color: var(--gray);
            font-size: 15px;
        }
        /* 灰色背景区块 */
        .bg-gray{
            background: #EEF2F8;
        }
        /* 底部 */
        .footer{
            width: 100%;
            background: var(--dark);
            color: #ccc;
            text-align: center;
            padding: 40px 20px;
            font-size: 15px;
        }