/* 全局样式 */
* {
    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: #f5f7fa;
}

#targetDiv {
    width: 100%;
    min-height: 100vh;
    background-color: #f5f7fa;
}

/* 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 {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: #2c3e50;
    text-decoration: none;
}

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

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

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

.nav-links a:hover {
    color: #3498db;
}

/* 首屏 */
.hero {
    background-color: #2c3e50;
    color: #fff;
    padding: 120px 20px 80px;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero p {
    font-size: 18px;
    margin-bottom: 40px;
    opacity: 0.9;
}

.downlbtnvmmn {
    display: inline-block;
    background-color: #3498db;
    color: #fff;
    padding: 15px 40px;
    text-decoration: none;
    border-radius: 50px;
    font-size: 18px;
    font-weight: bold;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.downlbtnvmmn:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

/* 产品分类 */
.products {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 20px;
    text-align: center;
}

.section-title {
    font-size: 36px;
    margin-bottom: 60px;
    color: #2c3e50;
    text-align: center;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.product-item {
    background-color: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    transition: transform 0.3s ease;
}

.product-item:hover {
    transform: translateY(-10px);
}

.product-item h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: #2c3e50;
}

/* 功能介绍 */
.features {
    background-color: #fff;
    padding: 80px 20px;
}

.features-content {
    max-width: 1200px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.feature-item {
    text-align: center;
    background-color: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    transition: transform 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-10px);
}

.feature-item h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: #2c3e50;
}

.feature-item p {
    color: #666;
    line-height: 1.6;
}

/* 产品介绍 */
.product-intro {
    background-color: #f5f7fa;
    padding: 80px 20px;
}

.product-intro-content {
    max-width: 1200px;
    margin: 0 auto;
}

.product-intro-container {
    display: flex;
    align-items: center;
    gap: 60px;
    flex-wrap: wrap;
}

.product-intro-text {
    flex: 1;
    min-width: 300px;
}

.product-intro-text h3 {
    font-size: 28px;
    margin-bottom: 20px;
    color: #2c3e50;
}

.product-intro-text p {
    font-size: 16px;
    line-height: 1.8;
    color: #666;
    margin-bottom: 20px;
}

.product-intro-image {
    flex: 1;
    min-width: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.product-intro-image img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

/* 优势介绍 */
.advantages {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 20px;
    text-align: center;
}

.advantages-list {
    list-style: none;
    margin-top: 60px;
    text-align: left;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.advantages-list li {
    background-color: #fff;
    padding: 25px 30px;
    margin-bottom: 20px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    display: flex;
    align-items: flex-start;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    color: #555;
    line-height: 1.6;
}

.advantages-list li:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}

.advantages-list li:before {
    content: '✓';
    background-color: #27ae60;
    color: #fff;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 20px;
    font-weight: bold;
    flex-shrink: 0;
    margin-top: 2px;
}

.advantages-list li strong {
    color: #2c3e50;
    font-weight: 600;
    margin-right: 8px;
}

/* 常见问题 */
.faq {
    background-color: #fff;
    padding: 80px 20px;
}

.faq-content {
    max-width: 1200px;
    margin: 0 auto;
}

.faq-item {
    background-color: #f8f9fa;
    padding: 25px 30px;
    margin-bottom: 20px;
    border-radius: 10px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid #e9ecef;
}

.faq-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

.faq-item h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: #2c3e50;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.faq-item h3::after {
    content: '▼';
    font-size: 14px;
    color: #666;
    transition: transform 0.3s ease;
}

.faq-item:hover h3::after {
    transform: rotate(180deg);
}

.faq-item p {
    color: #666;
    line-height: 1.7;
    margin: 0;
}

/* 底部版权 */
footer {
    background-color: #2c3e50;
    color: #fff;
    padding: 40px 20px;
    text-align: center;
}

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

/* 通用页面样式 */
.page-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 120px 20px 80px;
}

.page-title {
    font-size: 36px;
    margin-bottom: 40px;
    color: #2c3e50;
    text-align: center;
}

.page-description {
    font-size: 18px;
    margin-bottom: 60px;
    text-align: center;
    color: #666;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero h1 {
        font-size: 36px;
    }
    
    .hero p {
        font-size: 16px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .product-grid,
    .features-grid {
        grid-template-columns: 1fr;
    }
}