/* style.css - 钢板网产品网站样式 */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Open Sans', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f9f9f9;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 排版 */
h1, h2, h3, h4 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 15px;
}

h1 {
    font-size: 2.2rem;
}

h2 {
    font-size: 2rem;
    color: #2c3e50;
}

h3 {
    font-size: 1.5rem;
    color: #34495e;
}

p {
    margin-bottom: 15px;
}

a {
    text-decoration: none;
    color: #3498db;
    transition: color 0.3s;
}

a:hover {
    color: #2980b9;
}

/* 按钮样式 */
.btn-primary, .btn-secondary {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 4px;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'Montserrat', sans-serif;
}

.btn-primary {
    background-color: #3498db;
    color: white;
    border: 2px solid #3498db;
}

.btn-primary:hover {
    background-color: #2980b9;
    border-color: #2980b9;
    color: white;
}

.btn-secondary {
    background-color: transparent;
    color: #3498db;
    border: 2px solid #3498db;
}

.btn-secondary:hover {
    background-color: #3498db;
    color: white;
}

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

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo a {
    color: #2c3e50;
}

.logo h1 span {
    color: #3498db;
}

.tagline {
    font-size: 0.85rem;
    color: #7f8c8d;
    margin-bottom: 0;
}

/* 桌面导航 */
.desktop-nav {
    display: flex;
}

.nav-list {
    display: flex;
    list-style: none;
}

.nav-list > li {
    position: relative;
    margin-left: 25px;
}

.nav-list > li > a {
    color: #2c3e50;
    font-weight: 600;
    padding: 5px 0;
    display: flex;
    align-items: center;
}

.nav-list > li > a.active,
.nav-list > li > a:hover {
    color: #3498db;
}

/* 下拉菜单 */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: white;
    min-width: 220px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    border-radius: 4px;
    list-style: none;
    padding: 10px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
    z-index: 100;
}

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

.dropdown-menu li {
    width: 100%;
}

.dropdown-menu a {
    display: block;
    padding: 10px 20px;
    color: #2c3e50;
    font-weight: 500;
    transition: background-color 0.3s;
}

.dropdown-menu a:hover {
    background-color: #f5f7fa;
    color: #3498db;
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: #2c3e50;
}

/* 移动端导航 */
.mobile-nav {
    display: none;
    background-color: white;
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    z-index: 999;
}

.mobile-nav-list {
    list-style: none;
    padding: 0;
}

.mobile-nav-list li {
    border-bottom: 1px solid #eee;
}

.mobile-nav-list a {
    display: block;
    padding: 15px 20px;
    color: #2c3e50;
    font-weight: 600;
}

.mobile-nav-list a.active {
    color: #3498db;
}

.mobile-dropdown-menu {
    display: none;
    list-style: none;
    background-color: #f9f9f9;
    padding-left: 20px;
}

.mobile-dropdown-menu li {
    border-bottom: none;
}

.mobile-dropdown-menu a {
    font-weight: 500;
    padding: 12px 20px;
}

.mobile-dropdown.active .mobile-dropdown-menu {
    display: block;
}

/* Hero 区域 */
.hero {
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1573164713988-8665fc963095?ixlib=rb-4.0.3&auto=format&fit=crop&w=1600&q=80');
    background-size: cover;
    background-position: center;
    color: white;
    padding: 100px 0;
    text-align: center;
}

.hero-content h2 {
    color: white;
    font-size: 2.8rem;
    margin-bottom: 20px;
}

.hero-content h2 span {
    color: #3498db;
}

.hero-content p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 30px;
}

/* 主内容区域 */
.main-content {
    padding: 80px 0;
}

.section {
    margin-bottom: 80px;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-header p {
    color: #7f8c8d;
    max-width: 700px;
    margin: 0 auto;
}

/* 产品区域 */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
}

.product-card {
    background-color: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

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

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
}

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

.product-info {
    padding: 20px;
}

.product-info h3 {
    margin-bottom: 10px;
}

.product-info p {
    color: #7f8c8d;
    margin-bottom: 20px;
}

/* 应用区域 */
.applications-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.application-item {
    background-color: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.application-image {
    height: 200px;
    overflow: hidden;
}

.application-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.application-info {
    padding: 20px;
}

/* 技术规格区域 */
.specifications-table {
    overflow-x: auto;
    margin-bottom: 30px;
}

table {
    width: 100%;
    border-collapse: collapse;
    background-color: white;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

thead {
    background-color: #3498db;
    color: white;
}

th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid #eee;
}

tbody tr:hover {
    background-color: #f5f7fa;
}

.specs-note {
    background-color: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid #3498db;
}

/* 关于我们区域 */
.about-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.about-image {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.about-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* 新闻区域 */
.news-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
}

.news-list {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.news-item {
    padding-bottom: 20px;
    border-bottom: 1px solid #eee;
}

.news-item:last-child {
    border-bottom: none;
}

.news-date {
    display: block;
    color: #7f8c8d;
    font-size: 0.9rem;
    margin-bottom: 10px;
}

.sidebar-box {
    background-color: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    margin-bottom: 30px;
}

.sidebar-box h3 {
    margin-bottom: 15px;
}

.sidebar-box p {
    margin-bottom: 20px;
}

/* 联系区域 */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    background-color: white;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.contact-item {
    display: flex;
    margin-bottom: 25px;
}

.contact-item i {
    color: #3498db;
    font-size: 1.2rem;
    margin-right: 15px;
    margin-top: 5px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: 'Open Sans', sans-serif;
    font-size: 1rem;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3498db;
}

/* 页脚 */
.footer {
    background-color: #2c3e50;
    color: #ecf0f1;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    color: white;
    margin-bottom: 25px;
    font-size: 1.3rem;
}

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

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    color: #bdc3c7;
}

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

.contact-info li {
    display: flex;
    align-items: flex-start;
    margin-bottom: 15px;
}

.contact-info i {
    margin-right: 10px;
    color: #3498db;
    width: 20px;
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: #34495e;
    border-radius: 50%;
    color: white;
    transition: background-color 0.3s;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #34495e;
    color: #bdc3c7;
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .about-container,
    .contact-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .news-container {
        grid-template-columns: 1fr;
    }
    
    .news-sidebar {
        order: -1;
    }
}

@media (max-width: 768px) {
    .desktop-nav {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero-content h2 {
        font-size: 2.2rem;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .applications-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    h2 {
        font-size: 1.6rem;
    }
    
    .hero {
        padding: 70px 0;
    }
    
    .main-content {
        padding: 50px 0;
    }
    
    .section {
        margin-bottom: 60px;
    }
}