/* ========================================
   CSS变量系统
   ======================================== */
:root {
    /* 颜色 */
    --primary-color: #2E8B57;
    --primary-dark: #1f6b42;
    --primary-light: #3fa76a;
    --secondary-color: #F5F5DC;
    --accent-color: #FFD700;
    --text-dark: #333333;
    --text-light: #666666;
    --text-white: #ffffff;
    --bg-light: #f9f9f9;
    --bg-white: #ffffff;
    --border-color: #e0e0e0;
    
    /* 字体 */
    --font-primary: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    --font-size-base: 16px;
    --font-size-small: 14px;
    --font-size-large: 18px;
    --font-size-h1: 48px;
    --font-size-h2: 36px;
    --font-size-h3: 28px;
    --font-size-h4: 24px;
    
    /* 间距 */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-xxl: 64px;
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* 阴影 */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.18);
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
}

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

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

a:hover {
    color: var(--primary-color);
}

ul, ol {
    list-style: none;
}

/* ========================================
   容器
   ======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-fluid {
    width: 100%;
    padding: 0 var(--spacing-md);
}

/* ========================================
   导航栏
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--bg-white);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    transition: all var(--transition-base);
}

.navbar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    max-width: 1200px;
    margin: 0 auto;
}

.navbar-logo {
    display: flex;
    align-items: center;
    font-size: var(--font-size-h4);
    font-weight: bold;
    color: var(--primary-color);
}

.navbar-logo img {
    height: 50px;
    margin-right: var(--spacing-sm);
}

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

.navbar-item {
    position: relative;
    padding: var(--spacing-sm) 0;
}

.navbar-link {
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--text-dark);
    transition: color var(--transition-fast);
}

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

/* 下拉菜单 */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background-color: var(--bg-white);
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base);
    padding: var(--spacing-sm) 0;
    margin-top: var(--spacing-sm);
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    padding: var(--spacing-sm) var(--spacing-md);
    transition: background-color var(--transition-fast);
}

.dropdown-item:hover {
    background-color: var(--bg-light);
}

.dropdown-link {
    display: block;
    color: var(--text-dark);
    font-size: var(--font-size-base);
}

/* 二级下拉菜单 */
.dropdown-submenu {
    position: relative;
}

.dropdown-submenu-menu {
    position: absolute;
    left: 100%;
    top: 0;
    min-width: 200px;
    background-color: var(--bg-white);
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-md);
    opacity: 0;
    visibility: hidden;
    transform: translateX(-10px);
    transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base);
    transition-delay: 0s;
    padding: var(--spacing-sm) 0;
    list-style: none;
    margin-left: var(--spacing-xs);
}

.dropdown-submenu:hover .dropdown-submenu-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
    transition-delay: 0.15s;
}

.dropdown-submenu-menu:hover {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

.dropdown-submenu-menu li {
    padding: var(--spacing-xs) var(--spacing-md);
    transition: background-color var(--transition-fast);
}

.dropdown-submenu-menu li:hover {
    background-color: var(--bg-light);
}

.dropdown-submenu-menu a {
    display: block;
    color: var(--text-dark);
    font-size: 14px;
    white-space: nowrap;
}

.navbar-logo {
    font-size: 18px;
    white-space: nowrap;
    flex-shrink: 0;
}

.navbar-container {
    padding: var(--spacing-sm) 0;
}

/* 移动端菜单按钮 */
.navbar-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.navbar-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 2px;
    transition: all var(--transition-base);
}

/* ========================================
   Hero区
   ======================================== */
.hero {
    position: relative;
    height: 600px;
    margin-top: 80px;
    overflow: hidden;
}

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

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity var(--transition-slow);
}

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

.hero-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(46, 139, 87, 0.8) 0%, rgba(46, 139, 87, 0.4) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-content {
    text-align: center;
    color: var(--text-white);
    max-width: 800px;
    padding: var(--spacing-md);
}

.hero-title {
    font-size: var(--font-size-h1);
    font-weight: bold;
    margin-bottom: var(--spacing-md);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: var(--font-size-h3);
    margin-bottom: var(--spacing-lg);
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ========================================
   按钮
   ======================================== */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-align: center;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--text-white);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-white);
    border: 2px solid var(--text-white);
}

.btn-secondary:hover {
    background-color: var(--text-white);
    color: var(--primary-color);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-large);
}

/* ========================================
   数据统计区
   ======================================== */
.stats-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--primary-color);
    color: var(--text-white);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-md);
}

.stat-number {
    font-size: var(--font-size-h1);
    font-weight: bold;
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    font-size: var(--font-size-large);
    opacity: 0.9;
}

/* ========================================
   核心业务展示区
   ======================================== */
.business-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--bg-light);
}

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

.section-title {
    font-size: var(--font-size-h2);
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

.section-subtitle {
    font-size: var(--font-size-large);
    color: var(--text-light);
    margin-top: var(--spacing-md);
}

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

.business-card {
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.business-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.business-card-image {
    width: 100%;
    height: 250px;
    overflow: hidden;
}

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

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

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

.business-card-title {
    font-size: var(--font-size-h4);
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
}

.business-card-description {
    font-size: var(--font-size-base);
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.business-card-link {
    display: inline-flex;
    align-items: center;
    color: var(--primary-color);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.business-card-link:hover {
    gap: 8px;
}

.business-card-link::after {
    content: '→';
    margin-left: 4px;
    transition: margin-left var(--transition-fast);
}

.business-card-link:hover::after {
    margin-left: 8px;
}

/* ========================================
   优势特色区
   ======================================== */
.advantages-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--bg-white);
}

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

.advantage-item {
    text-align: center;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.advantage-item:hover {
    background-color: var(--bg-light);
}

.advantage-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background-color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    color: var(--text-white);
}

.advantage-title {
    font-size: var(--font-size-h4);
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
}

.advantage-description {
    font-size: var(--font-size-base);
    color: var(--text-light);
    line-height: 1.8;
}

/* ========================================
   CTA区
   ======================================== */
.cta-section {
    padding: var(--spacing-xxl) 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--text-white);
    text-align: center;
}

.cta-title {
    font-size: var(--font-size-h2);
    margin-bottom: var(--spacing-md);
}

.cta-description {
    font-size: var(--font-size-large);
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background-color: #2c2c2c;
    color: var(--text-white);
    padding: var(--spacing-xxl) 0 var(--spacing-md);
}

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

.footer-section h3 {
    font-size: var(--font-size-h4);
    margin-bottom: var(--spacing-md);
    color: var(--text-white);
}

.footer-section p,
.footer-section li {
    font-size: var(--font-size-base);
    color: #cccccc;
    line-height: 1.8;
    margin-bottom: var(--spacing-xs);
}

.footer-section a {
    color: #cccccc;
    transition: color var(--transition-fast);
}

.footer-section a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    border-top: 1px solid #444444;
    padding-top: var(--spacing-md);
    text-align: center;
    color: #999999;
    font-size: var(--font-size-small);
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 768px) {
    .navbar-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--bg-white);
        flex-direction: column;
        gap: 0;
        box-shadow: var(--shadow-lg);
    }
    
    .navbar-menu.active {
        display: flex;
    }
    
    .navbar-item {
        width: 100%;
        padding: var(--spacing-sm) var(--spacing-md);
        border-bottom: 1px solid var(--border-color);
    }
    
    .navbar-toggle {
        display: flex;
    }
    
    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        background-color: var(--bg-light);
        display: none;
    }
    
    .dropdown.active .dropdown-menu {
        display: block;
    }
    
    .hero {
        height: 400px;
    }
    
    .hero-title {
        font-size: var(--font-size-h2);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-h4);
    }
    
    .business-grid,
    .advantages-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   内页通用样式
   ======================================== */
.page-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--text-white);
    padding: var(--spacing-xxl) 0;
    margin-top: 80px;
    text-align: center;
}

.page-title {
    font-size: var(--font-size-h1);
    margin-bottom: var(--spacing-sm);
}

.page-breadcrumb {
    font-size: var(--font-size-base);
    opacity: 0.9;
}

.page-breadcrumb a {
    color: var(--text-white);
    text-decoration: underline;
}

.page-content {
    padding: var(--spacing-xxl) 0;
}

.content-section {
    margin-bottom: var(--spacing-xl);
}

.content-section h2 {
    font-size: var(--font-size-h3);
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
}

.content-section p {
    font-size: var(--font-size-base);
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

/* ========================================
   产品列表
   ======================================== */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

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

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.product-image {
    width: 100%;
    height: 220px;
    overflow: hidden;
}

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

.product-card:hover .product-image img {
    transform: scale(1.05);
}

.product-info {
    padding: var(--spacing-md);
}

.product-name {
    font-size: var(--font-size-large);
    color: var(--text-dark);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.product-description {
    font-size: var(--font-size-small);
    color: var(--text-light);
    line-height: 1.6;
}

/* ========================================
   新闻列表
   ======================================== */
.news-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.news-item {
    display: flex;
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.news-item:hover {
    box-shadow: var(--shadow-xl);
}

.news-image {
    width: 300px;
    height: 200px;
    overflow: hidden;
    flex-shrink: 0;
}

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

.news-item:hover .news-image img {
    transform: scale(1.05);
}

.news-content {
    padding: var(--spacing-md);
    flex: 1;
}

.news-title {
    font-size: var(--font-size-h4);
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
}

.news-meta {
    font-size: var(--font-size-small);
    color: var(--text-light);
    margin-bottom: var(--spacing-sm);
}

.news-excerpt {
    font-size: var(--font-size-base);
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.news-link {
    color: var(--primary-color);
    font-weight: 500;
}

/* ========================================
   联系表单
   ======================================== */
.contact-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    font-size: var(--font-size-base);
    color: var(--text-dark);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.form-input,
.form-textarea {
    width: 100%;
    padding: var(--spacing-sm);
    font-size: var(--font-size-base);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-textarea {
    min-height: 150px;
    resize: vertical;
}

.form-submit {
    width: 100%;
}

/* ========================================
   实用工具类
   ======================================== */
.text-center {
    text-align: center;
}

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

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

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.pt-1 { padding-top: var(--spacing-xs); }
.pt-2 { padding-top: var(--spacing-sm); }
.pt-3 { padding-top: var(--spacing-md); }
.pt-4 { padding-top: var(--spacing-lg); }
.pt-5 { padding-top: var(--spacing-xl); }

.pb-1 { padding-bottom: var(--spacing-xs); }
.pb-2 { padding-bottom: var(--spacing-sm); }
.pb-3 { padding-bottom: var(--spacing-md); }
.pb-4 { padding-bottom: var(--spacing-lg); }
.pb-5 { padding-bottom: var(--spacing-xl); }


/* 时间线样式 */
.timeline {
    position: relative;
    padding: 2rem 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--primary-color);
    transform: translateX(-50%);
}

.timeline-item {
    display: flex;
    margin-bottom: 3rem;
    position: relative;
}

.timeline-item:nth-child(odd) {
    flex-direction: row;
}

.timeline-item:nth-child(even) {
    flex-direction: row-reverse;
}

.timeline-year {
    flex: 0 0 45%;
    text-align: right;
    padding-right: 3rem;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.timeline-item:nth-child(even) .timeline-year {
    text-align: left;
    padding-left: 3rem;
    padding-right: 0;
}

.timeline-content {
    flex: 0 0 45%;
    background: #fff;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.timeline-content h3 {
    margin-top: 0;
    color: var(--primary-color);
}

/* 网站地图样式 */
.sitemap-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.sitemap-section h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.sitemap-section ul {
    list-style: none;
    padding: 0;
}

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

.sitemap-section ul ul {
    margin-left: 1rem;
    margin-top: 0.5rem;
}

.sitemap-section a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.sitemap-section a:hover {
    color: var(--primary-color);
}

/* 联系信息卡片网格 */
.contact-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.contact-info-card {
    background: #fff;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.contact-info-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

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

.contact-info-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* 联系表单样式 */
.contact-form {
    background: #fff;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-color);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
}

/* 新闻卡片网格 */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

.news-card {
    background: #fff;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.news-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.news-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

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

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

.news-info {
    padding: 1.5rem;
}

.news-date {
    color: #888;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.news-title {
    color: var(--primary-color);
    margin: 0.5rem 0;
    font-size: 1.2rem;
}

.news-description {
    color: var(--text-color);
    line-height: 1.6;
}

/* 响应式设计优化 */
@media (max-width: 1024px) {
    .timeline::before {
        left: 30px;
    }
    
    .timeline-item {
        flex-direction: column !important;
        padding-left: 60px;
    }
    
    .timeline-year {
        text-align: left !important;
        padding: 0 !important;
        margin-bottom: 1rem;
    }
    
    .timeline-content {
        flex: 1;
    }
}

@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .business-grid,
    .advantages-grid,
    .product-grid {
        grid-template-columns: 1fr;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-info-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .cta-buttons {
        flex-direction: column;
        gap: 1rem;
    }
    
    .btn-large {
        width: 100%;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 1.5rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .page-title {
        font-size: 2rem;
    }
}

/* 打印样式 */
@media print {
    .navbar,
    .cta-section,
    .footer {
        display: none;
    }
    
    .page-content {
        padding: 0;
    }
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

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

/* 工具提示 */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 200px;
    background-color: #333;
    color: #fff;
    text-align: center;
    border-radius: var(--border-radius);
    padding: 0.5rem;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -100px;
    opacity: 0;
    transition: opacity 0.3s;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}