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

:root {
    /* 主色调 */
    --primary-color: #dc2626;
    --primary-hover: #b91c1c;
    --primary-light: #fecaca;

    /* 中性色 */
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    --background: #ffffff;
    --background-alt: #f9fafb;
    --border-color: #e5e7eb;

    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;

    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-full: 9999px;

    /* 过渡 */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background);
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ==================== 按钮样式 ==================== */
.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
    cursor: pointer;
}

.btn-primary {
    background-color: #ffffff;
    color: var(--text-primary);
    border: 2px solid transparent;
}

.btn-primary:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: #ffffff;
    transform: scale(1.05);
}

/* ==================== 头部导航 ==================== */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: #ffffff;
    box-shadow: var(--shadow-sm);
}

.top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.logo {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    transition: transform var(--transition-base);
}

.logo:hover {
    transform: scale(1.02);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

/* 搜索框 */
.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box input {
    padding: 0.5rem 1rem;
    padding-right: 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.search-btn {
    position: absolute;
    right: 0.75rem;
    font-size: 1rem;
    color: var(--text-secondary);
    background: none;
    border: none;
    cursor: pointer;
}

/* 语言切换 */
.lang-switch {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.lang-switch a {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.lang-switch a.active,
.lang-switch a:hover {
    color: var(--primary-color);
}

.lang-switch span {
    color: var(--text-tertiary);
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    font-size: 1.5rem;
    padding: var(--spacing-sm);
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

.menu-toggle:hover {
    color: var(--primary-color);
}

/* 导航菜单 */
.nav-menu {
    background-color: #ffffff;
}

.nav-menu ul {
    display: flex;
    justify-content: center;
    list-style: none;
    padding: var(--spacing-md) var(--spacing-lg);
}

.nav-menu ul li {
    margin: 0 var(--spacing-xs);
}

.nav-menu ul li a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-menu ul li a:hover,
.nav-menu ul li a.active {
    color: var(--primary-color);
    background-color: var(--primary-light);
}

/* ==================== 轮播图 ==================== */
.hero-carousel {
    position: relative;
    width: 100%;
    height: 600px;
    overflow: hidden;
    background-color: #111827;
}

.carousel-track {
    position: relative;
    width: 100%;
    height: 100%;
}

.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    transition: transform var(--transition-slow);
}

/* 轮播图背景 */
.slide1 {
    background-image: url('images/carousel/slide1.jpg');
}

.slide2 {
    background-image: url('images/carousel/slide2.jpg');
}

.slide3 {
    background-image: url('images/carousel/slide3.jpg');
}

/* 轮播图遮罩 */
.carousel-slide::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(220, 38, 38, 0.8), rgba(249, 115, 22, 0.8));
}

.slide2::before {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.8), rgba(6, 182, 212, 0.8));
}

.slide3::before {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.8), rgba(20, 184, 166, 0.8));
}

/* 轮播图内容 */
.slide-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    padding: var(--spacing-xl) var(--spacing-lg);
    color: #ffffff;
}

.slide-content h2 {
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-md);
    opacity: 0.9;
}

.slide-content h1 {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
}

.slide-content p {
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
}

/* 轮播图控制按钮 */
.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 3rem;
    height: 3rem;
    font-size: 1.5rem;
    background-color: rgba(255, 255, 255, 0.2);
    color: #ffffff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
    z-index: 10;
}

.carousel-btn:hover {
    background-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-50%) scale(1.1);
}

.prev-btn {
    left: var(--spacing-lg);
}

.next-btn {
    right: var(--spacing-lg);
}

/* 轮播图指示器 */
.carousel-indicators {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--spacing-sm);
    z-index: 10;
}

.indicator {
    width: 0.75rem;
    height: 0.75rem;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.5);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
}

.indicator:hover {
    background-color: rgba(255, 255, 255, 0.75);
}

.indicator.active {
    width: 2rem;
    background-color: #ffffff;
}

/* ==================== 产品展示区域 ==================== */
.products-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--background-alt);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.section-header-justify {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
}

.section-header-justify h2 {
    margin-bottom: var(--spacing-sm);
}

.view-more-link {
    font-weight: 600;
    color: var(--primary-color);
    transition: transform var(--transition-fast);
}

.view-more-link:hover {
    transform: translateX(0.25rem);
}

/* 产品网格 */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.product-card {
    background-color: #ffffff;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.product-card:hover {
    transform: translateY(-0.25rem);
    box-shadow: var(--shadow-xl);
}

.card-image {
    position: relative;
    height: 16rem;
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

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

.card-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 50%;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.6), transparent);
}

.overlay-amber {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.6), rgba(249, 115, 22, 0.6));
}

.overlay-green {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.6), rgba(20, 184, 166, 0.6));
}

.overlay-yellow {
    background: linear-gradient(135deg, rgba(234, 179, 8, 0.6), rgba(245, 158, 11, 0.6));
}

.overlay-red {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.6), rgba(236, 72, 153, 0.6));
}

.overlay-blue {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.6), rgba(6, 182, 212, 0.6));
}

.overlay-purple {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.6), rgba(139, 92, 246, 0.6));
}

.card-content {
    padding: var(--spacing-lg);
}

.card-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.card-content p {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-md);
}

.card-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.875rem;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.card-link span {
    color: var(--primary-color);
    transition: transform var(--transition-fast);
}

.card-link:hover {
    color: var(--primary-color);
}

.card-link:hover span {
    transform: translateX(0.25rem);
}

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

/* ==================== 新闻中心区域 ==================== */
.news-section {
    padding: var(--spacing-xl) 0;
    background-color: #ffffff;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.news-card {
    background-color: #ffffff;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.news-card:hover {
    transform: translateY(-0.25rem);
    box-shadow: var(--shadow-xl);
}

.news-image {
    position: relative;
    height: 12rem;
    overflow: hidden;
}

.news-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

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

.news-tag {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--primary-color);
    color: #ffffff;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.news-content {
    padding: var(--spacing-lg);
}

.news-date {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-sm);
}

.news-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.4;
    transition: color var(--transition-fast);
}

.news-card:hover .news-content h3 {
    color: var(--primary-color);
}

.news-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.read-more {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-color);
    transition: transform var(--transition-fast);
}

.read-more:hover {
    transform: translateX(0.25rem);
}

.mobile-only {
    display: none;
}

/* ==================== 页脚 ==================== */
.footer {
    background-color: #111827;
    color: #d1d5db;
    padding: var(--spacing-xl) 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-info h3 {
    font-size: 2rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: var(--spacing-md);
}

.footer-info p {
    font-size: 0.875rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    color: #9ca3af;
}

.contact-info {
    font-size: 0.875rem;
    color: #6b7280;
}

.contact-info p {
    margin-bottom: var(--spacing-xs);
}

.footer-links h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: var(--spacing-md);
}

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

.footer-links ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    font-size: 0.875rem;
    color: #9ca3af;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: #ffffff;
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--spacing-xl);
    border-top: 1px solid #374151;
}

.footer-bottom p {
    font-size: 0.875rem;
    color: #6b7280;
}

.footer-legal {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-legal a {
    font-size: 0.875rem;
    color: #9ca3af;
    transition: color var(--transition-fast);
}

.footer-legal a:hover {
    color: #ffffff;
}

/* ==================== 响应式设计 ==================== */

/* 平板设备 */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }

    .slide-content h1 {
        font-size: 2.5rem;
    }
}

/* 手机设备 */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 1.5rem;
        --spacing-xl: 3rem;
    }

    .header-actions {
        gap: var(--spacing-md);
    }

    .search-box {
        display: none;
    }

    .menu-toggle {
        display: block;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: #ffffff;
        box-shadow: var(--shadow-lg);
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-base);
    }

    .nav-menu.active {
        max-height: 500px;
    }

    .nav-menu ul {
        flex-direction: column;
        padding: var(--spacing-md);
    }

    .nav-menu ul li {
        margin: 0;
    }

    .nav-menu ul li a {
        padding: var(--spacing-md);
        text-align: center;
        border-radius: var(--radius-md);
    }

    .hero-carousel {
        height: 450px;
    }

    .slide-content {
        padding: var(--spacing-lg);
    }

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

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

    .carousel-btn {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1.25rem;
    }

    .prev-btn {
        left: var(--spacing-md);
    }

    .next-btn {
        right: var(--spacing-md);
    }

    .products-grid,
    .news-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .section-header-justify {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }

    .view-more-link {
        display: none;
    }

    .mobile-only {
        display: block;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }

    .footer-legal {
        justify-content: center;
    }
}

/* 小屏幕手机 */
@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .logo {
        font-size: 1.5rem;
    }

    .hero-carousel {
        height: 350px;
    }

    .slide-content h1 {
        font-size: 1.75rem;
    }

    .section-header h2 {
        font-size: 1.5rem;
    }

    .card-image {
        height: 12rem;
    }

    .news-image {
        height: 10rem;
    }
}