/* 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: #f8f9fa;
}

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

/* 导航栏 */
.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 1rem 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo h2 {
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-logo i {
    margin-right: 8px;
    color: #ffd700;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 5px;
}

.nav-link:hover,
.nav-link.active {
    background-color: rgba(255,255,255,0.2);
    transform: translateY(-2px);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: white;
    margin: 3px 0;
    transition: 0.3s;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 24px;
    text-decoration: none;
    border-radius: 25px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: rgba(255,255,255,0.9);
    color: #333;
}

.btn-secondary:hover {
    background: white;
    transform: translateY(-2px);
}

/* 轮播图 */
.hero {
    margin-top: 80px;
    position: relative;
    height: 600px;
    overflow: hidden;
}

.hero-slider {
    height: 100%;
    position: relative;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.slide.active {
    opacity: 1;
}

.slide-content {
    flex: 1;
    padding: 0 4rem;
    color: white;
    z-index: 2;
}

.slide-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: bold;
}

.slide-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

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

.slide-image img {
    max-width: 80%;
    height: auto;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.slider-controls {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 100%;
    display: flex;
    justify-content: space-between;
    padding: 0 2rem;
    z-index: 3;
}

.prev-btn,
.next-btn {
    background: rgba(255,255,255,0.2);
    border: none;
    color: white;
    padding: 1rem;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.2rem;
}

.prev-btn:hover,
.next-btn:hover {
    background: rgba(255,255,255,0.3);
    transform: scale(1.1);
}

.slider-dots {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 1rem;
    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: white;
    transform: scale(1.2);
}

/* 分类导航 */
.categories {
    padding: 4rem 0;
    background: white;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #333;
    font-weight: bold;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.category-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.category-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.2);
    border-color: #667eea;
}

.category-icon {
    font-size: 3rem;
    color: #667eea;
    margin-bottom: 1rem;
}

.category-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.category-card p {
    color: #666;
    font-size: 0.9rem;
}

/* 热门商品 */
.featured-products {
    padding: 4rem 0;
    background: #f8f9fa;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.product-card {
    background: white;
    border-radius: 15px;
    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 30px rgba(0,0,0,0.2);
}

.product-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.product-card:hover .product-image img {
    transform: scale(1.1);
}

.product-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.product-card:hover .product-overlay {
    opacity: 1;
}

.product-info {
    padding: 1.5rem;
}

.product-info h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.product-desc {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.product-price {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.price {
    font-size: 1.3rem;
    font-weight: bold;
    color: #e74c3c;
}

.original-price {
    font-size: 1rem;
    color: #999;
    text-decoration: line-through;
}

.product-rating {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.product-rating i {
    color: #f39c12;
    font-size: 0.9rem;
}

.product-rating span {
    color: #666;
    font-size: 0.9rem;
}

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

/* 特色服务 */
.features {
    padding: 4rem 0;
    background: white;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-item {
    text-align: center;
    padding: 2rem;
}

.feature-icon {
    font-size: 3rem;
    color: #667eea;
    margin-bottom: 1rem;
}

.feature-item h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: #333;
}

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

/* 页脚 */
.footer {
    background: #2c3e50;
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    color: #ecf0f1;
}

.footer-section p {
    color: #bdc3c7;
    margin-bottom: 0.5rem;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

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

.footer-section ul li a:hover {
    color: #3498db;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    color: white;
    font-size: 1.5rem;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #34495e;
    color: #bdc3c7;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: #667eea;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .slide-content {
        padding: 0 2rem;
    }

    .slide-content h1 {
        font-size: 2rem;
    }

    .slide-content p {
        font-size: 1rem;
    }

    .slider-controls {
        padding: 0 1rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .category-grid,
    .product-grid,
    .feature-grid {
        grid-template-columns: 1fr;
    }

    .hero {
        height: 400px;
    }

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

    .slide-image {
        display: none;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .slide-content h1 {
        font-size: 1.5rem;
    }

    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }

    .category-card,
    .product-card {
        margin: 0 10px;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.category-card,
.product-card,
.feature-item {
    animation: fadeIn 0.6s ease-out;
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 表单样式 */
.form-container {
    max-width: 400px;
    margin: 100px auto;
    padding: 2rem;
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.form-title {
    text-align: center;
    margin-bottom: 2rem;
    color: #333;
    font-size: 1.8rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: #333;
    font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
}

.form-btn {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.form-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.form-link {
    text-align: center;
    margin-top: 1rem;
}

.form-link a {
    color: #667eea;
    text-decoration: none;
}

.form-link a:hover {
    text-decoration: underline;
}