/* 全局重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", sans-serif;
}
html {
    scroll-behavior: smooth;
}
body {
    color: #333;
    background: #fff;
    line-height: 1.7;
}
ul { list-style: none; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
.container {
    width: 92%;
    max-width: 1200px;
    margin: 0 auto;
}
.btn {
    display: inline-block;
    padding: 12px 28px;
    background: #0056cc;
    color: #fff;
    border-radius: 4px;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}
.btn:hover {
    background: #0044a3;
}
.btn-light {
    background: #fff;
    color: #0056cc;
    border: 1px solid #0056cc;
}
.btn-light:hover {
    background: #f5f8ff;
}
.section {
    padding: 80px 0;
}
.section-title {
    text-align: center;
    margin-bottom: 60px;
}
.section-title h2 {
    font-size: 32px;
    color: #111;
    margin-bottom: 12px;
}
.section-title p {
    color: #666;
    max-width: 700px;
    margin: 0 auto;
}

/* 头部导航 */
header {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    position: sticky;
    top: 0;
    z-index: 999;
}
.header-wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}
.logo {
    font-size: 22px;
    font-weight: bold;
    color: #0056cc;
}
.nav-list {
    display: flex;
    gap: 36px;
}
.nav-list li a {
    font-size: 15px;
    position: relative;
    padding: 6px 0;
}
.nav-list li a.active::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: #0056cc;
}
.mobile-menu-btn {
    display: none;
    font-size: 26px;
    cursor: pointer;
}
.mobile-nav {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    width: 100%;
    background: #fff;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}
.mobile-nav li {
    padding: 14px 5%;
    border-bottom: 1px solid #eee;
}
.mobile-nav.show { display: block; }

/* 首页轮播横幅 */
.banner {
    width:100%;
    height: 600px;
    background: linear-gradient(135deg, #0047b3, #0066ff);
    color: #fff;
    display: flex;
    align-items: center;
}
.banner-content h1 {
    font-size: 46px;
    margin-bottom: 20px;
    line-height: 1.3;
}
.banner-content p {
    font-size: 18px;
    margin-bottom: 32px;
    max-width: 600px;
    opacity: 0.95;
}
.banner-btns {
    display: flex;
    gap: 20px;
}

/* 优势卡片 */
.advantage-wrap {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}
.adv-card {
    padding: 30px;
    background: #f7f9ff;
    border-radius: 8px;
    transition: 0.3s;
}
.adv-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 8px 24px rgba(0,86,204,0.12);
}
.adv-card h3 {
    font-size: 20px;
    margin: 14px 0 10px;
    color: #0044a3;
}

/* 产品矩阵 */
.product-wrap {
    display: grid;
    grid-template-columns: repeat(4,1fr);
    gap: 24px;
}
.pro-card {
    border: 1px solid #eee;
    border-radius: 8px;
    overflow: hidden;
}
.pro-body {
    padding: 24px;
}
.pro-body h3 {
    margin-bottom: 10px;
    color: #003377;
}

/* 行业解决方案卡片 */
.solu-wrap {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 30px;
}
.solu-card {
    background: #f8faff;
    padding: 32px;
    border-radius: 10px;
}
.solu-card h3 {
    color: #0044a3;
    margin-bottom: 16px;
}

/* 案例卡片 */
.case-wrap {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 30px;
}
.case-card {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}
.case-text {
    padding: 24px;
}
.case-text h3 {
    margin-bottom: 8px;
}

/* 联系页面表单 */
.contact-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}
.form-item {
    margin-bottom: 20px;
}
.form-item label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}
.form-item input, .form-item textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 15px;
}
.info-item {
    margin-bottom: 24px;
}
.info-item h4 {
    color: #0044a3;
    margin-bottom: 6px;
}

/* 底部 */
footer {
    background: #0a1833;
    color: #ccc;
    padding: 60px 0 30px;
}
.footer-row {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 40px;
    margin-bottom: 40px;
}
.footer-col h3 {
    color: #fff;
    margin-bottom: 20px;
    font-size: 18px;
}
.footer-col li {
    margin-bottom: 10px;
}
.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #223359;
    font-size: 14px;
}

/* 响应式适配 */
@media(max-width:1024px){
    .advantage-wrap, .product-wrap { grid-template-columns: repeat(2,1fr); }
    .solu-wrap, .case-wrap { grid-template-columns: repeat(2,1fr); }
}
@media(max-width:768px){
    .nav-list { display: none; }
    .mobile-menu-btn { display: block; }
    .banner { height: 420px; }
    .banner-content h1 { font-size: 30px; }
    .section { padding: 50px 0; }
    .advantage-wrap, .product-wrap, .solu-wrap, .case-wrap { grid-template-columns: 1fr; }
    .contact-row { grid-template-columns: 1fr; }
    .footer-row { grid-template-columns: 1fr; gap:30px; }
}
/* 页面顶部横幅通用样式 */
.page-banner {
    width: 100%;
    height: 320px;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
}
.page-banner::after {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 20, 60, 0.55);
}
.banner-text-wrap {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 0 20px;
}
.page-banner h1 {
    font-size: 40px;
    margin-bottom: 12px;
}
.page-banner p {
    font-size: 18px;
    opacity: 0.9;
}