* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft Yahei", sans-serif;
}

body {
    background: #f5f7fa;
    color: #333;
    line-height: 1.7;
}

/* 导航栏全局统一 */
nav {
    background: #0a1a33;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    position: sticky;
    top: 0;
    z-index: 999;
}
.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}
.nav-container a {
    color: #fff;
    text-decoration: none;
    padding: 15px 22px;
    display: block;
    transition: 0.3s;
}
.nav-container a:hover {
    background: #1890ff;
}

/* 容器统一 */
.container {
    width: 92%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 0;
}

/* 板块通用样式 */
.section {
    background: #fff;
    padding: 35px;
    border-radius: 12px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
    margin-bottom: 40px;
}
.section h2 {
    color: #0f2440;
    margin-bottom: 25px;
    border-left: 5px solid #1890ff;
    padding-left: 15px;
    font-size: 24px;
}

/* 图片占位框 */
.img-box {
    width: 100%;
    height: 260px;
    background: #e8edf5;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #666;
    margin: 15px 0;
    border: 2px dashed #b8c8e0;
}

/* 服务卡片网格 */
.service-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 22px;
}
.service-card {
    padding: 22px;
    border: 1px solid #eee;
    border-radius: 10px;
    transition: 0.3s;
}
.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.06);
    border-color: #1890ff;
}
.service-card h3 {
    color: #0f2440;
    margin-bottom: 12px;
}

/* 场景条目 */
.scene-item {
    padding: 12px 0;
    border-bottom: 1px dashed #eee;
}

/* 优势条目 */
.advantage-item {
    padding: 10px 0;
}
.advantage-item::before {
    content: "✅";
    margin-right: 8px;
}

/* 首页横幅 */
.banner {
    width: 100%;
    height: 340px;
    background: #0f2440;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #fff;
    text-align: center;
    padding: 20px;
}
.banner h1 {
    font-size: 38px;
    margin-bottom: 12px;
}
.banner p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 8px;
}
.douyin {
    margin-top: 18px;
    background: #fe2c55;
    padding: 10px 25px;
    border-radius: 30px;
    color: #fff;
    font-weight: bold;
    font-size: 16px;
}

/* 页脚全局统一 */
footer {
    background: #0a1a33;
    color: #fff;
    text-align: center;
    padding: 25px 0;
    margin-top: 30px;
}