/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", sans-serif;
}

body {
    background: #f7f8fa;
    color: #333;
    line-height: 1.7;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* 头部 */
.header {
    background: #2d8cf0;
    color: #fff;
    padding: 18px 0;
    position: sticky;
    top: 0;
    z-index: 99;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 22px;
    font-weight: bold;
}

.nav a {
    color: #fff;
    margin-left: 20px;
    text-decoration: none;
}

/* banner */
.banner {
    background: #3b9dff;
    color: #fff;
    text-align: center;
    padding: 60px 0;
}

.banner h1 {
    font-size: 36px;
    margin-bottom: 10px;
}

/* 板块通用 */
.section {
    padding: 50px 0;
}

.section h2 {
    text-align: center;
    font-size: 26px;
    margin-bottom: 30px;
    color: #2d8cf0;
}

/* 业务板块 */
.service-box {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.service-box .item {
    flex: 1;
    min-width: 280px;
    background: #fff;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.service-box .item h3 {
    color: #2d8cf0;
    margin-bottom: 10px;
}

/* 联系我们 */
.contact {
    background: #fff;
}

/* 底部 */
.footer {
    background: #333;
    color: #fff;
    text-align: center;
    padding: 25px 0;
}

.footer a {
    color: #fff;
    text-decoration: none;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 10px;
    }

    .nav a {
        margin: 0 10px;
    }

    .banner h1 {
        font-size: 28px;
    }
}