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

body {
    color: #333;
    line-height: 1.8;
    background-color: #fff;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

a {
    color: #0066cc;
    text-decoration: none;
}

a:hover {
    color: #0099ff;
}

/* 头部导航 */
.header {
    padding: 15px 0;
    box-shadow: 0 2px 10px #eee;
    position: sticky;
    top: 0;
    background: #fff;
    z-index: 99;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.logo {
    font-size: 22px;
    color: #222;
    font-weight: 600;
}

.nav a {
    margin: 0 10px;
    font-size: 15px;
}

/* 横幅 */
.banner {
    background: linear-gradient(135deg, #0066cc, #0099ff);
    color: #fff;
    text-align: center;
    padding: 60px 0;
}

.banner h2 {
    font-size: 28px;
    margin-bottom: 15px;
}

.banner p {
    font-size: 16px;
    opacity: 0.9;
}

/* 通用区块 */
.section {
    padding: 60px 0;
}

.bg-gray {
    background: #f8f9fa;
}

.title {
    font-size: 24px;
    text-align: center;
    margin-bottom: 30px;
    color: #222;
}

.content-text {
    font-size: 16px;
    margin-bottom: 15px;
    text-indent: 2em;
}

/* 功能列表 */
.function-list {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
    justify-content: center;
}

.function-item {
    flex: 1;
    min-width: 280px;
    padding: 30px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 15px #eee;
}

.function-item h4 {
    font-size: 18px;
    margin-bottom: 15px;
    color: #0066cc;
}

/* 底部 */
.footer {
    background: #222;
    color: #ccc;
    text-align: center;
    padding: 30px 0;
    font-size: 14px;
}

.footer a {
    color: #ccc;
    margin: 0 5px;
}

.footer p {
    margin: 8px 0;
}

/* 适配手机 */
@media (max-width: 768px) {
    .banner h2 {
        font-size: 22px;
    }
    .section {
        padding: 40px 0;
    }
}