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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

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

/* 导航栏样式 */
.navbar {
    background-color: #2c3e50;
    color: white;
    padding: 1rem 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

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

.nav-brand h1 {
    font-size: 1.8rem;
    font-weight: 600;
}

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

.nav-menu a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-menu a:hover {
    color: #3498db;
}

/* 移动端菜单按钮 */
.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: white;
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 2px;
}

/* 菜单按钮动画 */
.nav-toggle.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border: none;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
}

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

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

/* 首页样式 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 120px 0 80px;
    text-align: center;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-content h2 {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    font-weight: 400;
}

.company-intro {
    max-width: 800px;
    margin: 0 auto 3rem;
    text-align: left;
}

.company-intro p {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    line-height: 1.8;
    opacity: 0.95;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* 章节标题样式 */
.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    color: #2c3e50;
    font-weight: 600;
}

/* 产品介绍样式 */
.products {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.product-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #3498db, #2980b9);
}

.product-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.product-card h3 {
    font-size: 1.4rem;
    color: #2c3e50;
    margin-bottom: 1rem;
    font-weight: 600;
}

.product-description {
    margin-bottom: 1.5rem;
}

.product-description p {
    font-size: 0.95rem;
    color: #555;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.product-features {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin-top: 1rem;
}

.feature-tag {
    background-color: #e8f4f8;
    color: #2980b9;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid #d4e6f1;
}

.product-link {
    margin-top: 1.5rem;
}

.product-link .btn {
    width: 100%;
    padding: 10px 20px;
    font-size: 0.9rem;
}

/* 解决方案样式 */
.solutions {
    padding: 80px 0;
    background-color: white;
}

.solutions-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.placeholder-text {
    font-size: 1.2rem;
    color: #7f8c8d;
    margin-bottom: 3rem;
    font-style: italic;
}

.solutions-preview h3 {
    font-size: 1.8rem;
    color: #2c3e50;
    margin-bottom: 2rem;
}

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

.solution-item {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid #3498db;
}

.solution-item h4 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.solution-item p {
    color: #555;
}

/* 联系我们样式 */
.contact {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info h3,
.contact-form h3 {
    font-size: 1.8rem;
    color: #2c3e50;
    margin-bottom: 2rem;
}

.contact-item {
    margin-bottom: 2rem;
}

.contact-item h4 {
    color: #3498db;
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.contact-item p {
    color: #555;
    font-size: 1.1rem;
}

/* 表单样式 */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: #2c3e50;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

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

/* 页脚样式 */
.footer {
    background-color: #2c3e50;
    color: 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 h4 {
    margin-bottom: 1rem;
    color: #3498db;
    font-size: 1.2rem;
}

.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 ease;
}

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

.footer-bottom {
    border-top: 1px solid #34495e;
    padding-top: 2rem;
    text-align: center;
}

.legal-info p {
    margin-bottom: 1rem;
    color: #bdc3c7;
}

.legal-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1rem;
}

.legal-item {
    color: #95a5a6;
    font-size: 0.9rem;
}

.legal-link {
    color: #95a5a6;
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.legal-link:hover {
    color: #3498db;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .products-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 900px) {
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .product-card {
        padding: 1.5rem;
    }
}

@media (max-width: 768px) {
    /* 导航栏移动端样式 */
    .navbar .container {
        position: relative;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: #2c3e50;
        flex-direction: column;
        gap: 0;
        padding: 1rem 0;
        box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-menu li {
        text-align: center;
        padding: 0.5rem 0;
        border-bottom: 1px solid #34495e;
    }
    
    .nav-menu li:last-child {
        border-bottom: none;
    }
    
    .nav-menu a {
        display: block;
        padding: 0.5rem 1rem;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-content h2 {
        font-size: 1.2rem;
    }
    
    .company-intro {
        text-align: center;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    /* 产品网格：移动端每行显示2个 */
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .product-card {
        padding: 1.2rem;
    }
    
    .product-card h3 {
        font-size: 1.2rem;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .solution-items {
        grid-template-columns: 1fr;
    }
    
    .legal-links {
        flex-direction: column;
        gap: 0.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-content h1 {
        font-size: 1.8rem;
    }
    
    .products,
    .solutions,
    .contact {
        padding: 60px 0;
    }
    
    /* 小屏幕：产品卡片每行显示1个 */
    .products-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .product-card {
        padding: 1rem;
    }
    
    .product-card h3 {
        font-size: 1.1rem;
    }
    
    .product-icon {
        font-size: 2.5rem;
    }
    
    .feature-tag {
        font-size: 0.75rem;
        padding: 0.25rem 0.6rem;
    }
    
    /* 导航菜单按钮在小屏幕上的调整 */
    .nav-toggle span {
        width: 20px;
        height: 2px;
    }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

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

.product-card,
.solution-item {
    animation: fadeInUp 0.6s ease-out;
}

/* 产品卡片悬停效果增强 */
.product-card:hover .product-icon {
    transform: scale(1.1);
    transition: transform 0.3s ease;
}

.product-card:hover .feature-tag {
    background-color: #3498db;
    color: white;
    transition: all 0.3s ease;
}