* {
    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: #f9f9f9;
}

#targetDiv {
    width: 100%;
    margin: 0;
    background-color: #fff;
}

/* 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;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: #007bff;
    text-decoration: none;
}

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

.nav-links li {
    margin-left: 2rem;
}

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

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

/* 首屏 */
.hero {
    background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    color: #fff;
    padding: 6rem 2rem 4rem;
    margin-top: 70px;
}

.hero-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
}

.hero-text {
    flex: 1;
    padding-right: 2rem;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    max-width: 600px;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.downlbtnvmmn {
    background-color: #fff;
    color: #007bff;
    padding: 1rem 2rem;
    border: none;
    border-radius: 50px;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.downlbtnvmmn:hover {
    background-color: #f8f9fa;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

/* 通用板块样式 */
.section {
    padding: 4rem 2rem;
}

.section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #333;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

/* 产品分类 */
.products {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    text-align: center;
    max-width: 1200px;
    margin: 0 auto;
}

.product-card {
    background-color: #f8f9fa;
    padding: 2rem;
    border-radius: 10px;
    transition: all 0.3s ease;
}

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

.product-card i {
    font-size: 3rem;
    color: #007bff;
    margin-bottom: 1rem;
}

.product-card h3 {
    margin-bottom: 1rem;
    color: #333;
}

/* 功能介绍 */
.features {
    background-color: #f8f9fa;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-item {
    background-color: #fff;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

.feature-item h3 {
    margin-bottom: 1rem;
    color: #007bff;
}

/* 优势介绍 */
.advantages {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.advantage-item {
    display: flex;
    align-items: flex-start;
}

.advantage-item i {
    font-size: 2rem;
    color: #007bff;
    margin-right: 1rem;
    margin-top: 0.2rem;
}

.advantage-item h3 {
    margin-bottom: 0.5rem;
    color: #333;
}

/* 常见问题 */
.faq {
    background-color: #f8f9fa;
    max-width: 1200px;
    margin: 0 auto;
}

.faq-item {
    background-color: #fff;
    padding: 1.5rem;
    margin-bottom: 1rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

.faq-item h3 {
    margin-bottom: 0.5rem;
    color: #007bff;
}

/* 底部版权 */
footer {
    background-color: #333;
    color: #fff;
    padding: 2rem;
    text-align: center;
}

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

/* 专题页样式 */
专题页 h1 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: #333;
}

专题页 p {
    text-align: center;
    font-size: 1.1rem;
    margin-bottom: 3rem;
    color: #666;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* 响应式设计 */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
        padding: 1rem;
    }
    
    .nav-links {
        margin-top: 1rem;
    }
    
    .nav-links li {
        margin-left: 1rem;
        margin-right: 1rem;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-content {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-text {
        padding-right: 0;
        margin-bottom: 2rem;
    }
    
    .hero-image i {
        font-size: 10rem !important;
    }
    
    .section h2 {
        font-size: 2rem;
    }
    
    .section {
        padding: 2rem 1rem;
    }
}