/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #e74c3c;
    --secondary-color: #3498db;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
    --gray-color: #7f8c8d;
    --success-color: #2ecc71;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f9f9f9;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 顶部导航栏 */
.header {
    background-color: white;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo-area {
    display: flex;
    flex-direction: column;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 5px;
}

.logo i {
    color: var(--primary-color);
    font-size: 28px;
}

.logo h1 {
    font-size: 24px;
    color: var(--dark-color);
    font-weight: 700;
}

.site-info {
    display: flex;
    gap: 15px;
    font-size: 12px;
    color: var(--gray-color);
}

.domain {
    background-color: var(--light-color);
    padding: 3px 8px;
    border-radius: 4px;
}

.ip {
    background-color: #e8f4fc;
    padding: 3px 8px;
    border-radius: 4px;
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 25px;
}

.main-nav a {
    text-decoration: none;
    color: var(--dark-color);
    font-weight: 500;
    padding: 8px 0;
    position: relative;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 5px;
}

.main-nav a:hover, .main-nav a.active {
    color: var(--primary-color);
}

.main-nav a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 3px;
}

.user-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

.cart-btn, .login-btn {
    background-color: var(--light-color);
    color: var(--dark-color);
    padding: 8px 16px;
    border-radius: var(--border-radius);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: var(--transition);
    position: relative;
}

.cart-btn:hover, .login-btn:hover {
    background-color: var(--primary-color);
    color: white;
}

.cart-count {
    position: absolute;
    top: -8px;
    right: -8px;
    background-color: var(--primary-color);
    color: white;
    font-size: 12px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--dark-color);
    cursor: pointer;
}

/* 主横幅 */
.hero {
    background: linear-gradient(135deg, #fdfcfb 0%, #e2d1c3 100%);
    padding: 80px 0;
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero h2 {
    font-size: 42px;
    color: var(--dark-color);
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero p {
    font-size: 18px;
    color: #555;
    margin-bottom: 15px;
}

.hero .highlight {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 20px;
    margin: 25px 0;
}

.cta-button {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 15px 30px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 700;
    font-size: 18px;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    margin-top: 20px;
    box-shadow: 0 4px 15px rgba(231, 76, 60, 0.3);
    display: flex;
    align-items: center;
    gap: 10px;
    width: fit-content;
}

.cta-button:hover {
    background-color: #c0392b;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(231, 76, 60, 0.4);
}

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

.image-placeholder {
    width: 300px;
    height: 300px;
    background-color: white;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    box-shadow: var(--shadow);
    color: var(--primary-color);
    padding: 20px;
    text-align: center;
}

.image-placeholder i {
    font-size: 100px;
    margin-bottom: 20px;
}

/* 分类区域 */
.categories, .specials, .about {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 36px;
    color: var(--dark-color);
    margin-bottom: 50px;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

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

.category-card {
    background-color: white;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}

.category-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.category-icon {
    width: 80px;
    height: 80px;
    background-color: #ffeaea;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 auto 20px;
    color: var(--primary-color);
    font-size: 32px;
}

.category-card h3 {
    font-size: 22px;
    margin-bottom: 10px;
    color: var(--dark-color);
}

.category-card p {
    color: var(--gray-color);
}

/* 热销产品 */
.specials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 30px;
}

.product-card {
    background-color: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.product-badge {
    position: absolute;
    top: 15px;
    left: 15px;
    background-color: var(--primary-color);
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 700;
    z-index: 1;
}

.product-image {
    height: 200px;
    background-color: #f8f9fa;
    display: flex;
    justify-content: center;
    align-items: center;
}

.product-image .image-placeholder {
    width: 150px;
    height: 150px;
    background-color: white;
    color: var(--secondary-color);
}

.product-info {
    padding: 25px;
}

.product-info h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--dark-color);
}

.product-desc {
    color: var(--gray-color);
    margin-bottom: 15px;
    font-size: 14px;
}

.product-price {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.current-price {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}

.original-price {
    font-size: 16px;
    color: var(--gray-color);
    text-decoration: line-through;
}

.add-to-cart {
    width: 100%;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    padding: 12px;
    border-radius: var(--border-radius);
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
}

.add-to-cart:hover {
    background-color: #2980b9;
}

/* 关于我们 */
.about-content {
    display: flex;
    align-items: center;
    gap: 50px;
}

.about-text {
    flex: 1;
}

.about-text p {
    margin-bottom: 20px;
    font-size: 17px;
    line-height: 1.8;
}

.features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-top: 30px;
}

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

.feature i {
    color: var(--success-color);
}

.about-image {
    flex: 1;
}

/* 页脚 */
.footer {
    background-color: var(--dark-color);
    color: white;
    padding-top: 60px;
}

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

.footer-section h3 {
    font-size: 22px;
    margin-bottom: 20px;
    color: white;
}

.footer-section p {
    margin-bottom: 10px;
    color: #bdc3c7;
}

.contact-info i {
    margin-right: 10px;
    color: var(--primary-color);
}

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

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

.footer-section ul li a {
    color: #bdc3c7;
    text-decoration: none;
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: var(--primary-color);
    padding-left: 5px;
}

.deployment-info i {
    margin-right: 10px;
    color: var(--secondary-color);
}

/* 备案信息区域 */
.footer-bottom {
    border-top: 1px solid #34495e;
    padding: 30px 0;
    text-align: center;
}

.beian-info {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 15px;
}

.beian-info i {
    color: var(--primary-color);
    margin-right: 5px;
}

.beian-info a {
    color: white;
    text-decoration: none;
    transition: var(--transition);
}

.beian-info a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.divider {
    color: #7f8c8d;
}

.copyright {
    color: #bdc3c7;
    margin-bottom: 10px;
}

.note {
    color: #95a5a6;
    font-size: 14px;
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.6;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
    z-index: 999;
    display: flex;
    justify-content: center;
    align-items: center;
}

.back-to-top:hover {
    background-color: #c0392b;
    transform: translateY(-5px);
}

/* 响应式设计 */
@media (max-width: 992px) {
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-content {
        margin-bottom: 40px;
    }
    
    .cta-button {
        margin: 0 auto;
    }
    
    .about-content {
        flex-direction: column;
    }
}

@media (max-width: 768px) {
    .main-nav, .user-actions {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .logo h1 {
        font-size: 20px;
    }
    
    .site-info {
        font-size: 10px;
    }
    
    .hero h2 {
        font-size: 32px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .categories-grid, .specials-grid {
        grid-template-columns: 1fr;
    }
    
    .features {
        grid-template-columns: 1fr;
    }
    
    .beian-info {
        flex-direction: column;
        gap: 5px;
    }
}

@media (max-width: 480px) {
    .hero h2 {
        font-size: 28px;
    }
    
    .hero p {
        font-size: 16px;
    }
    
    .image-placeholder {
        width: 250px;
        height: 250px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}