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

:root {
    --primary-color: #1e88e5;
    --secondary-color: #43a047;
    --accent-color: #ff6f00;
    --text-color: #333;
    --light-bg: #f5f5f5;
    --white: #ffffff;
    --border-color: #e0e0e0;
}

body {
    font-family: 'Microsoft YaHei', 'SimHei', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
}

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

/* 导航栏 */
.header {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    padding: 1rem 0;
}

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

.logo h1 {
    color: var(--primary-color);
    font-size: 1.8rem;
    margin-bottom: 0.2rem;
}

.logo .subtitle {
    font-size: 0.9rem;
    color: #666;
}

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

.nav-menu a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
    padding: 0.5rem 0;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-color);
    transition: 0.3s;
}

/* 轮播图 */
.hero {
    position: relative;
    height: 500px;
    overflow: hidden;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

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

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease-in-out;
    display: flex;
    align-items: center;
    justify-content: center;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.slide.active {
    opacity: 1;
}

.slide-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    z-index: 1;
}

.slide-content {
    text-align: center;
    color: var(--white);
    z-index: 2;
}

.slide-content h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
    animation: fadeInUp 1s;
}

.slide-content p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    animation: fadeInUp 1s 0.3s both;
}

.btn-primary {
    display: inline-block;
    padding: 12px 30px;
    background: var(--accent-color);
    color: var(--white);
    text-decoration: none;
    border-radius: 25px;
    font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s;
    animation: fadeInUp 1s 0.6s both;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 111, 0, 0.4);
}

.slider-controls {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 100%;
    display: flex;
    justify-content: space-between;
    padding: 0 20px;
    z-index: 10;
}

.slider-controls button {
    background: rgba(255,255,255,0.3);
    border: none;
    color: var(--white);
    font-size: 2rem;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    transition: background 0.3s;
}

.slider-controls button:hover {
    background: rgba(255,255,255,0.5);
}

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

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

.dot.active {
    background: var(--white);
}

/* 产品分类 */
.categories {
    padding: 60px 0;
    background: var(--white);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--text-color);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: var(--primary-color);
    margin: 1rem auto;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 2rem;
}

.category-card {
    text-align: center;
    padding: 2rem;
    background: var(--light-bg);
    border-radius: 10px;
    transition: transform 0.3s, box-shadow 0.3s;
    cursor: pointer;
}

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

.category-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.category-card h3 {
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

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

/* 热门产品 */
.featured-products {
    padding: 60px 0;
    background: var(--light-bg);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.product-card {
    background: var(--white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.product-image {
    height: 200px;
    overflow: hidden;
    position: relative;
    background: #f0f0f0;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

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

.product-card a {
    text-decoration: none;
    color: inherit;
    display: block;
}

.product-card h3 {
    padding: 1rem 1rem 0.5rem;
    color: var(--text-color);
}

.product-desc {
    padding: 0 1rem;
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.product-price {
    padding: 0 1rem 1rem;
    color: var(--accent-color);
    font-size: 1.5rem;
    font-weight: 600;
}

.btn-secondary {
    display: inline-block;
    padding: 12px 30px;
    background: var(--primary-color);
    color: var(--white);
    text-decoration: none;
    border-radius: 25px;
    font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(30, 136, 229, 0.4);
}

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

/* 公司优势 */
.advantages {
    padding: 60px 0;
    background: var(--white);
}

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

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

.advantage-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.advantage-item h3 {
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

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

/* 页脚 */
.footer {
    background: #2c3e50;
    color: var(--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 {
    margin-bottom: 1rem;
    color: var(--white);
}

.footer-section p {
    margin-bottom: 0.5rem;
    color: #bdc3c7;
    font-size: 0.9rem;
}

.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;
}

.footer-section ul li a:hover {
    color: var(--white);
}

.footer-bottom {
    border-top: 1px solid #34495e;
    padding-top: 1rem;
    text-align: center;
    color: #bdc3c7;
    font-size: 0.9rem;
}

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

.footer-bottom a:hover {
    color: var(--white);
}

/* 产品页面 */
.products-page {
    padding: 80px 0;
    min-height: 60vh;
}

.page-header {
    text-align: center;
    margin-bottom: 3rem;
}

.page-header h1 {
    font-size: 2.5rem;
    color: var(--text-color);
    margin-bottom: 1rem;
}

.page-header p {
    color: #666;
    font-size: 1.1rem;
}

.product-filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 3rem;
}

.filter-btn {
    padding: 10px 20px;
    border: 2px solid var(--border-color);
    background: var(--white);
    color: var(--text-color);
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 1rem;
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

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

.products-list .product-card {
    background: var(--white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.products-list .product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.products-list .product-image {
    height: 200px;
    overflow: hidden;
    position: relative;
    background: #f0f0f0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.products-list .product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease, opacity 0.3s;
    display: block;
    opacity: 1;
}

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

/* 图片优化 */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* 图片懒加载优化 */
img[loading="lazy"] {
    opacity: 0;
    transition: opacity 0.3s;
}

img[loading="lazy"].loaded {
    opacity: 1;
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}