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

body {
    font-family: 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

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

/* 头部样式 */
.header {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-img {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 8px;
}

.logo-text {
    font-size: 24px;
    font-weight: bold;
    color: #667eea;
}

.nav-menu ul {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.nav-menu a:hover,
.nav-menu a.active {
    background: #667eea;
    color: #fff;
}

.header-actions {
    display: flex;
    gap: 15px;
}

.search-btn,
.user-btn {
    background: none;
    border: 1px solid #ddd;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.search-btn:hover,
.user-btn:hover {
    background: #667eea;
    color: #fff;
    border-color: #667eea;
}

/* 搜索覆盖层 */
.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 2000;
}

.search-overlay.active {
    display: flex;
}

.search-box {
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    display: flex;
    gap: 15px;
    align-items: center;
    min-width: 400px;
}

.search-box input {
    flex: 1;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 16px;
}

.search-confirm,
.search-close {
    padding: 12px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
}

.search-confirm {
    background: #667eea;
    color: #fff;
}

.search-close {
    background: #f8f9fa;
    color: #333;
}

/* 轮播横幅 */
.hero-banner {
    position: relative;
    height: 500px;
    overflow: hidden;
    margin-bottom: 50px;
}

.banner-container {
    position: relative;
    width: 100%;
    height: 100%;
}

.banner-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.5s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.banner-slide.active {
    opacity: 1;
}

.banner-slide img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.3;
}

.banner-content {
    text-align: center;
    color: #fff;
    z-index: 2;
    max-width: 600px;
    padding: 0 20px;
}

.banner-content h2 {
    font-size: 48px;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

.banner-content p {
    font-size: 20px;
    margin-bottom: 30px;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
}

.cta-btn {
    display: inline-block;
    background: #fff;
    color: #667eea;
    padding: 15px 30px;
    text-decoration: none;
    border-radius: 8px;
    font-weight: bold;
    transition: all 0.3s ease;
}

.cta-btn:hover {
    background: #f8f9fa;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

/* 横幅导航 */
.banner-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 100%;
    display: flex;
    justify-content: space-between;
    padding: 0 20px;
    z-index: 3;
}

.banner-prev,
.banner-next {
    background: rgba(255,255,255,0.8);
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 20px;
    color: #333;
    transition: all 0.3s ease;
}

.banner-prev:hover,
.banner-next:hover {
    background: rgba(255,255,255,1);
    transform: scale(1.1);
}

.banner-dots {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 3;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255,255,255,0.5);
    cursor: pointer;
    transition: all 0.3s ease;
}

.dot.active {
    background: #fff;
}

/* 通用部分样式 */
.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
    color: #333;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 2px;
}

/* 商品分类 */
.categories {
    padding: 80px 0;
    background: #fff;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.category-item {
    text-align: center;
    padding: 30px;
    border-radius: 12px;
    background: #f8f9fa;
    transition: all 0.3s ease;
    cursor: pointer;
}

.category-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    background: #fff;
}

.category-item img {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    margin-bottom: 20px;
    object-fit: cover;
}

.category-item h3 {
    font-size: 24px;
    margin-bottom: 10px;
    color: #333;
}

.category-item p {
    color: #666;
    margin-bottom: 20px;
}

.category-item a {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
    padding: 8px 20px;
    border: 2px solid #667eea;
    border-radius: 6px;
    display: inline-block;
    transition: all 0.3s ease;
}

.category-item a:hover {
    background: #667eea;
    color: #fff;
}

/* 推荐商品 */
.featured-products {
    padding: 80px 0;
    background: #f8f9fa;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.product-card {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.15);
}

.product-card img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.product-info {
    padding: 25px;
}

.product-info h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: #333;
}

.product-desc {
    color: #666;
    margin-bottom: 15px;
    font-size: 14px;
}

.product-price {
    margin-bottom: 20px;
}

.current-price {
    font-size: 24px;
    font-weight: bold;
    color: #e74c3c;
}

.original-price {
    font-size: 16px;
    color: #999;
    text-decoration: line-through;
    margin-left: 10px;
}

.add-to-cart {
    width: 100%;
    background: #667eea;
    color: #fff;
    border: none;
    padding: 12px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.add-to-cart:hover {
    background: #5a6fd8;
    transform: translateY(-1px);
}

.view-more {
    text-align: center;
}

.btn-secondary {
    display: inline-block;
    background: transparent;
    color: #667eea;
    padding: 15px 30px;
    text-decoration: none;
    border: 2px solid #667eea;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background: #667eea;
    color: #fff;
}

/* 支付信息 */
.payment-info {
    padding: 80px 0;
    background: #fff;
}

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

.payment-item {
    text-align: center;
    padding: 40px 20px;
    border-radius: 12px;
    background: #f8f9fa;
    transition: all 0.3s ease;
}

.payment-item:hover {
    background: #fff;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transform: translateY(-5px);
}

.payment-item img {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 12px;
    margin-bottom: 20px;
    object-fit: contain;
}

.payment-item h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: #333;
}

.payment-item p {
    color: #666;
}

/* 公司优势 */
.company-features {
    padding: 80px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
}

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

.feature-item {
    text-align: center;
    padding: 30px 20px;
    border-radius: 12px;
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.feature-item:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-item h3 {
    font-size: 20px;
    margin-bottom: 10px;
}

.feature-item p {
    opacity: 0.9;
}

/* 页脚 */
.footer {
    background: #2c3e50;
    color: #fff;
    padding: 60px 0 20px;
}

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

.footer-section h3,
.footer-section h4 {
    margin-bottom: 20px;
    color: #fff;
}

.footer-section p {
    line-height: 1.8;
    opacity: 0.9;
    margin-bottom: 20px;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #fff;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    color: #bdc3c7;
    text-decoration: none;
    padding: 8px 12px;
    border: 1px solid #bdc3c7;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.social-links a:hover {
    color: #fff;
    border-color: #fff;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #34495e;
    opacity: 0.8;
}

.footer-bottom p {
    margin-bottom: 5px;
}

.footer-bottom a {
    color: #bdc3c7;
    text-decoration: none;
}

.footer-bottom a:hover {
    color: #fff;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-top {
        flex-direction: column;
        gap: 15px;
    }
    
    .nav-menu ul {
        flex-wrap: wrap;
        gap: 15px;
        justify-content: center;
    }
    
    .banner-content h2 {
        font-size: 32px;
    }
    
    .banner-content p {
        font-size: 16px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .product-grid,
    .category-grid,
    .payment-methods,
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .search-box {
        min-width: 300px;
        padding: 20px;
    }
    
    .banner-nav {
        display: none;
    }
}

@media (max-width: 480px) {
    .banner-content h2 {
        font-size: 24px;
    }
    
    .section-title {
        font-size: 24px;
    }
    
    .search-box {
        min-width: 250px;
        flex-direction: column;
    }
    
    .search-box input {
        margin-bottom: 10px;
    }
}