/* 全局变量 */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --dark-color: #343a40;
    --light-color: #f8f9fa;
    --success-color: #28a745;
    --max-width: 1200px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
}

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

a {
    text-decoration: none;
    color: var(--dark-color);
}

/* 通用容器 */
.container {
    width: 90%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 15px;
}

/* 通用按钮 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: var(--transition);
}

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

.btn-primary:hover {
    background-color: #0056b3;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: white;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.navbar-brand .logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.navbar-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    position: relative;
    padding: 5px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

.nav-link:hover::after {
    width: 100%;
}

.navbar-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.navbar-toggle span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--dark-color);
    transition: var(--transition);
}

/* 首页横幅 */
.hero {
    padding: 120px 0 60px;
    background: linear-gradient(135deg, #f6f9fc 0%, #e9ecef 100%);
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    color: var(--secondary-color);
    margin-bottom: 2rem;
}

/* 关于我们 */
.about {
    padding: 80px 0;
}

.about h2 {
    text-align: center;
    margin-bottom: 3rem;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text p {
    margin-bottom: 1rem;
}

/* 产品服务 */
.products {
    padding: 80px 0;
    background-color: var(--light-color);
}

.products h2 {
    text-align: center;
    margin-bottom: 3rem;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.product-card {
    background-color: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    transition: var(--transition);
}

.product-card:hover {
    transform: translateY(-5px);
}

.product-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.product-card h3 {
    padding: 1.5rem 1.5rem 0.5rem;
}

.product-card p {
    padding: 0 1.5rem 1.5rem;
    color: var(--secondary-color);
}

/* 联系我们 */
.contact {
    padding: 80px 0;
}

.contact h2 {
    text-align: center;
    margin-bottom: 3rem;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
}

.contact-info {
    display: grid;
    gap: 2rem;
}

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

.contact-form {
    display: grid;
    gap: 1.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

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

/* 页面头部 */
.page-header {
    background: linear-gradient(135deg, #f6f9fc 0%, #e9ecef 100%);
    padding: 80px 0 40px;
    margin-bottom: 40px;
    text-align: center;
}

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

.breadcrumb {
    color: var(--secondary-color);
}

.breadcrumb a {
    color: var(--primary-color);
    text-decoration: none;
}

/* 通用部分样式增强 */
.section {
    padding: 80px 0;
}

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

/* 关于页面样式 */
.culture-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.culture-item {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    transition: var(--transition);
}

.culture-item:hover {
    transform: translateY(-5px);
}

.culture-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 3rem auto;
    padding: 2rem 0;
}

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

.timeline-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 3rem;
}

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

.timeline-item .year {
    flex: 0 0 120px;
    text-align: center;
    font-weight: bold;
    color: var(--primary-color);
    position: relative;
}

.timeline-item .content {
    flex: 0 0 calc(50% - 80px);
    padding: 1.5rem;
    background: white;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

/* 产品页面样式 */
.category-filters {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
}

.category-btn {
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 5px;
    background: white;
    color: var(--dark-color);
    cursor: pointer;
    transition: var(--transition);
}

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

.products-wrapper {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.product-item {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    transition: var(--transition);
}

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

.product-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

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

.product-info {
    padding: 1.5rem;
}

.product-features {
    list-style: none;
    padding: 0;
    margin-top: 1rem;
}

.product-features li {
    padding-left: 1.5rem;
    position: relative;
    margin-bottom: 0.5rem;
}

.product-features li::before {
    content: '✓';
    color: var(--primary-color);
    position: absolute;
    left: 0;
}

/* 新闻页面样式 */
.news-filter {
    margin-bottom: 2rem;
}

.filter-wrapper {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    align-items: center;
    justify-content: space-between;
}

.search-box {
    position: relative;
    flex: 0 0 300px;
}

.search-box input {
    width: 100%;
    padding: 0.8rem 2.5rem 0.8rem 1rem;
    border: 1px solid #ddd;
    border-radius: 5px;
}

.search-btn {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
}

.category-tags {
    display: flex;
    gap: 1rem;
}

.tag-btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--primary-color);
    border-radius: 20px;
    background: none;
    color: var(--primary-color);
    cursor: pointer;
    transition: var(--transition);
}

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

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.news-item {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    transition: var(--transition);
}

.news-image {
    position: relative;
}

.news-date {
    position: absolute;
    top: 20px;
    left: 20px;
    background: white;
    padding: 0.5rem;
    border-radius: 5px;
    text-align: center;
}

.news-date .day {
    display: block;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.news-content {
    padding: 1.5rem;
}

.news-meta {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 3rem;
}

.page-btn {
    width: 40px;
    height: 40px;
    border: 1px solid #ddd;
    border-radius: 5px;
    background: white;
    cursor: pointer;
    transition: var(--transition);
}

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

.page-btn.next {
    width: auto;
    padding: 0 1rem;
}

/* 联系页面样式 */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.info-card {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    transition: var(--transition);
}

.info-card:hover {
    transform: translateY(-5px);
}

.info-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 1.5rem;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.contact-form-wrapper,
.map-wrapper {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

.contact-form {
    display: grid;
    gap: 1.5rem;
}

.form-group {
    position: relative;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--dark-color);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    transition: var(--transition);
}

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

.error-message {
    color: #dc3545;
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.map-container {
    margin: 1.5rem 0;
    border-radius: 10px;
    overflow: hidden;
}

.map-info ul {
    list-style: none;
    padding: 0;
}

.map-info li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.map-info li::before {
    content: '•';
    color: var(--primary-color);
    position: absolute;
    left: 0;
}

.social-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.social-item {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    transition: var(--transition);
    text-decoration: none;
}

.social-item:hover {
    transform: translateY(-5px);
}

.social-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 1.5rem;
}

/* 响应式调整 */
@media (max-width: 992px) {
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    .page-header {
        padding: 60px 0 30px;
    }

    .page-header h1 {
        font-size: 2rem;
    }

    .filter-wrapper {
        flex-direction: column;
        align-items: stretch;
    }

    .search-box {
        flex: none;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        flex-direction: column !important;
    }

    .timeline-item .year {
        margin-bottom: 1rem;
    }

    .timeline-item .content {
        flex: none;
        margin-left: 40px;
    }
}

/* 页脚 */
.footer {
    background-color: var(--dark-color);
    color: white;
    padding: 40px 0;
}

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

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: white;
    opacity: 0.8;
    transition: var(--transition);
}

.footer-links a:hover {
    opacity: 1;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    .navbar-toggle {
        display: flex;
    }

    .navbar-menu {
        position: absolute;
        top: 80px;
        left: 0;
        width: 100%;
        background-color: white;
        flex-direction: column;
        align-items: center;
        padding: 1rem 0;
        gap: 1rem;
        box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        transform: translateY(-150%);
        opacity: 0;
        transition: var(--transition);
    }

    .navbar-menu.active {
        transform: translateY(0);
        opacity: 1;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

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

@media (max-width: 576px) {
    .hero h1 {
        font-size: 2rem;
    }

    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}