* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", sans-serif;
}

:root {
    --primary: #0052cc;
    --primary-light: #1a73e8;
    --secondary: #00a86b;
    --dark: #0f172a;
    --gray: #64748b;
    --light: #f8fafc;
}

body {
    color: #333;
    background: #fff;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    padding: 18px 6%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 2px 20px rgba(0,0,0,0.08);
    z-index: 999;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--dark);
}

.logo span {
    color: var(--primary);
}

.nav-menu {
    display: flex;
    gap: 36px;
    list-style: none;
}

.nav-menu a {
    text-decoration: none;
    color: var(--dark);
    font-size: 16px;
    font-weight: 500;
    transition: 0.3s;
}

.nav-menu a:hover {
    color: var(--primary);
}

/* 首屏 Banner */
.hero {
    margin-top: 80px;
    height: 85vh;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: #fff;
    display: flex;
    align-items: center;
    padding: 0 6%;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(26,115,232,0.15) 0%, transparent 70%);
    right: -100px;
    top: 50%;
    transform: translateY(-50%);
}

.hero-content {
    max-width: 700px;
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-size: 52px;
    line-height: 1.2;
    margin-bottom: 24px;
}

.hero p {
    font-size: 18px;
    color: #cbd5e1;
    margin-bottom: 40px;
    line-height: 1.8;
}

.btn {
    display: inline-block;
    padding: 16px 40px;
    background: var(--primary);
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    font-size: 17px;
    font-weight: 500;
    transition: 0.3s;
}

.btn:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
}

/* 通用区块 */
.section {
    padding: 100px 6%;
}

.title {
    text-align: center;
    margin-bottom: 60px;
}

.title h2 {
    font-size: 36px;
    color: var(--dark);
    margin-bottom: 12px;
}

.title p {
    color: var(--gray);
    max-width: 650px;
    margin: 0 auto;
}

/* 产品板块 */
.product-wrap{
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px,1fr));
    gap:32px;
}
.product-card{
    border:1px solid #eee;
    border-radius:14px;
    overflow:hidden;
    transition:0.3s;
}
.product-card:hover{
    box-shadow:0 10px 30px rgba(0,82,204,0.12);
    transform:translateY(-5px);
}
.product-img{
    height:180px;
    background:#f3f7fd;
    display:flex;
    align-items:center;
    justify-content:center;
    color:#0052cc;
    font-size:15px;
}
.product-text{
    padding:22px;
}
.product-text h3{
    font-size:19px;
    color:#0f172a;
    margin-bottom:10px;
}
.product-text p{
    font-size:14px;
    color:#64748b;
    line-height:1.7;
}

/* 业务卡片 */
.card-box {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.card {
    background: #fff;
    border-radius: 16px;
    padding: 40px 30px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.05);
    transition: 0.3s;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 30px rgba(0,82,204,0.1);
}

.card h3 {
    font-size: 22px;
    margin: 20px 0 12px;
    color: var(--dark);
}

.card p {
    color: var(--gray);
    line-height: 1.7;
}

/* 关于我们 */
.about-row{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:50px;
    align-items:center;
}
.about-text h3{
    font-size:26px;
    color:#0f172a;
    margin-bottom:18px;
}
.about-text p{
    line-height:1.8;
    color:#64748b;
    margin-bottom:14px;
}
.about-img{
    height:360px;
    background:#f3f7fd;
    border-radius:14px;
}

/* 联系我们 */
.contact-box{
    display:grid;
    grid-template-columns: repeat(auto-fit,minmax(260px,1fr));
    gap:30px;
}
.contact-item{
    padding:25px;
    background:#f8fafc;
    border-radius:12px;
}
.contact-item h4{
    color:#0052cc;
    margin-bottom:12px;
    font-size:18px;
}
.contact-item p{
    line-height:1.8;
    color:#333;
}

/* 底部 */
.footer {
    background: var(--dark);
    color: #cbd5e1;
    padding: 60px 6% 30px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    margin-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 14px;
    line-height:1.8;
}
.footer-bottom a{
    color:#73a9ff;
    text-decoration:none;
}

/* ========================== */
/* 响应式：手机 + 平板适配 */
/* ========================== */
@media screen and (max-width:1200px){
    .about-row{
        grid-template-columns:1fr;
        gap:35px;
    }
}

@media screen and (max-width:768px) {
    .navbar{
        flex-direction:column;
        gap:14px;
        padding:14px 4%;
    }
    .nav-menu{
        flex-wrap:wrap;
        justify-content:center;
        gap:18px;
    }
    .hero{
        margin-top:115px;
        height:auto;
        padding:70px 4%;
    }
    .hero h1{
        font-size:32px;
    }
    .section{
        padding:50px 4%;
    }
    .title h2{
        font-size:26px;
    }
    .product-wrap{
        grid-template-columns:1fr;
    }
    .card-box{
        grid-template-columns:1fr;
    }
    .contact-box{
        grid-template-columns:1fr;
    }
}