/* 全局样式和重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

/* 容器类 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 10px 20px;
    background-color: #007bff;
    color: #fff;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: #0056b3;
}

/* 下载按钮样式 */
.downlbtnvmmn {
    background-color: #28a745;
    padding: 12px 30px;
    font-size: 18px;
    font-weight: bold;
}

.downlbtnvmmn:hover {
    background-color: #218838;
}

/* 头部导航 */
.header {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
}

.logo h1 {
    font-size: 24px;
    font-weight: bold;
    color: #007bff;
}

.nav ul {
    display: flex;
    list-style: none;
}

.nav ul li {
    margin-left: 30px;
}

.nav ul li a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav ul li a:hover {
    color: #007bff;
}

/* 首屏 */
.hero {
    background-color: #007bff;
    color: #fff;
    padding: 150px 0 100px;
    text-align: center;
}

.hero h2 {
    font-size: 48px;
    margin-bottom: 20px;
}

.hero p {
    font-size: 20px;
    margin-bottom: 40px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* 产品分类 */
.products {
    padding: 80px 0;
    background-color: #fff;
}

.products h2 {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
    color: #333;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.product-item {
    background-color: #f8f9fa;
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    transition: transform 0.3s ease;
}

.product-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.product-item h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: #007bff;
}

/* 功能介绍 */
.features {
    padding: 80px 0;
    background-color: #f5f5f5;
}

.features h2 {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
    color: #333;
}

.feature-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-item {
    background-color: #fff;
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.feature-item h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: #007bff;
}

/* 优势介绍 */
.advantages {
    padding: 80px 0;
    background-color: #fff;
}

.advantages h2 {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
    color: #333;
}

.advantage-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.advantage-item {
    background-color: #f8f9fa;
    padding: 30px;
    border-radius: 10px;
    transition: box-shadow 0.3s ease;
}

.advantage-item:hover {
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.advantage-item h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: #007bff;
}

/* 常见问题 */
.faq {
    padding: 80px 0;
    background-color: #f5f5f5;
    text-align: center;
}

.faq h2 {
    font-size: 36px;
    margin-bottom: 50px;
    color: #333;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto 50px;
    text-align: left;
}

.faq-item {
    background-color: #fff;
    padding: 20px;
    margin-bottom: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.faq-item h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: #007bff;
}

/* 下载页面 */
.download {
    padding: 150px 0 100px;
    background-color: #fff;
    text-align: center;
}

.download h2 {
    font-size: 36px;
    margin-bottom: 20px;
    color: #333;
}

.download p {
    font-size: 18px;
    margin-bottom: 50px;
    color: #666;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    max-width: 800px;
    margin: 0 auto 50px;
}

.download-item {
    background-color: #f8f9fa;
    padding: 40px 30px;
    border-radius: 10px;
    text-align: center;
    transition: transform 0.3s ease;
}

.download-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.download-item h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: #007bff;
}

.download-item p {
    margin-bottom: 30px;
    font-size: 16px;
}

.download-notes {
    max-width: 800px;
    margin: 0 auto;
    text-align: left;
    background-color: #f8f9fa;
    padding: 30px;
    border-radius: 10px;
}

.download-notes h3 {
    margin-bottom: 20px;
    color: #007bff;
}

.download-notes ul {
    list-style: disc;
    padding-left: 20px;
}

.download-notes li {
    margin-bottom: 10px;
}

/* 常见问题页面 */
.faq-page {
    padding: 150px 0 100px;
    background-color: #fff;
}

.faq-page h2 {
    text-align: center;
    font-size: 36px;
    margin-bottom: 20px;
    color: #333;
}

.faq-page p {
    text-align: center;
    font-size: 18px;
    margin-bottom: 50px;
    color: #666;
}

.contact-support {
    text-align: center;
    margin-top: 50px;
}

.contact-support h3 {
    margin-bottom: 20px;
    color: #333;
}

/* 底部版权 */
.footer {
    background-color: #333;
    color: #fff;
    padding: 50px 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.footer-links {
    display: flex;
    gap: 20px;
    margin-top: 20px;
}

.footer-links a {
    color: #fff;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #007bff;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
    }

    .nav ul {
        margin-top: 20px;
    }

    .nav ul li {
        margin: 0 15px;
    }

    .hero h2 {
        font-size: 36px;
    }

    .hero p {
        font-size: 16px;
    }

    .products h2,
    .features h2,
    .advantages h2,
    .faq h2,
    .download h2,
    .faq-page h2 {
        font-size: 28px;
    }

    .advantage-list {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 120px 0 80px;
    }

    .hero h2 {
        font-size: 28px;
    }

    .download {
        padding: 120px 0 80px;
    }

    .faq-page {
        padding: 120px 0 80px;
    }
}