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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

a {
    text-decoration: none;
    color: #007bff;
    transition: color 0.3s ease;
}

a:hover {
    color: #0056b3;
}

/* 头部样式 */
.header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: bold;
}

.navbar-nav .nav-link {
    font-size: 1rem;
    padding: 0.5rem 1rem;
    color: #333;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    color: #007bff;
}

/* 页面标题 */
.page-title {
    background-color: #007bff;
    color: #fff;
    padding: 2rem 0;
    margin-bottom: 2rem;
}

.page-title h1 {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.page-title p {
    font-size: 1.1rem;
    margin: 0;
}

.page-title p a {
    color: #fff;
    text-decoration: underline;
}

/* 首屏横幅 */
.banner {
    background-color: #f8f9fa;
    padding: 0;
}

.banner-content h1 {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
    color: #333;
}

.banner-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: #666;
}

/* 卡片样式 */
.card {
    border: none;
    border-radius: 0.5rem;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.card-title {
    font-size: 1.25rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

/* 图标框 */
.icon-box {
    width: 60px;
    height: 60px;
    background-color: #f8f9fa;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

/* 按钮样式 */
.btn-primary {
    background-color: #007bff;
    border-color: #007bff;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: bold;
    border-radius: 0.25rem;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

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

.btn-outline-primary {
    color: #007bff;
    border-color: #007bff;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: bold;
    border-radius: 0.25rem;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.btn-outline-primary:hover {
    background-color: #007bff;
    color: #fff;
}

/* 页脚样式 */
.footer {
    background-color: #343a40;
    color: #fff;
    padding: 3rem 0 1rem;
}

.footer h3 {
    font-size: 1.25rem;
    font-weight: bold;
    margin-bottom: 1rem;
}

.footer p,
.footer li {
    font-size: 0.9rem;
    color: #adb5bd;
}

.footer a {
    color: #adb5bd;
    transition: color 0.3s ease;
}

.footer a:hover {
    color: #fff;
}

.social-links a {
    display: inline-block;
    margin-right: 0.5rem;
}

/* 表单样式 */
.form-control {
    border: 1px solid #ced4da;
    border-radius: 0.25rem;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-control:focus {
    border-color: #007bff;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.form-label {
    font-weight: bold;
    margin-bottom: 0.5rem;
}

/* 图片懒加载 */
.lazy-img {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lazy-img.loaded {
    opacity: 1;
}

/* 时间线样式 */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: #007bff;
    left: 50%;
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    margin-bottom: 2rem;
}

.timeline-content {
    position: relative;
    width: 45%;
    padding: 1.5rem;
    background-color: #fff;
    border-radius: 0.5rem;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.timeline-item:nth-child(odd) .timeline-content {
    left: 0;
}

.timeline-item:nth-child(even) .timeline-content {
    left: 55%;
}

.timeline-content h3 {
    font-size: 1.25rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

/* 表格样式 */
.table {
    width: 100%;
    margin-bottom: 1rem;
    color: #333;
}

.table th,
.table td {
    padding: 0.75rem;
    vertical-align: top;
    border-top: 1px solid #dee2e6;
}

.table thead th {
    vertical-align: bottom;
    border-bottom: 2px solid #dee2e6;
    background-color: #007bff;
    color: #fff;
}

.table tbody tr:hover {
    background-color: #f8f9fa;
}

/* 分页样式 */
.pagination {
    display: flex;
    justify-content: center;
    margin-top: 2rem;
}

.pagination .page-item .page-link {
    color: #007bff;
    border-color: #dee2e6;
    margin: 0 0.25rem;
}

.pagination .page-item.active .page-link {
    background-color: #007bff;
    border-color: #007bff;
    color: #fff;
}

.pagination .page-item .page-link:hover {
    background-color: #e9ecef;
    border-color: #dee2e6;
}

/* 手风琴样式 */
.accordion {
    margin-bottom: 2rem;
}

.accordion-item {
    border: 1px solid #dee2e6;
    border-radius: 0.25rem;
    overflow: hidden;
}

.accordion-header {
    background-color: #f8f9fa;
    padding: 0;
}

.accordion-button {
    width: 100%;
    padding: 1rem;
    text-align: left;
    background-color: transparent;
    border: none;
    font-weight: bold;
    color: #333;
    transition: background-color 0.3s ease;
}

.accordion-button:hover {
    background-color: #e9ecef;
}

.accordion-button:focus {
    outline: none;
    box-shadow: none;
}

.accordion-body {
    padding: 1rem;
    border-top: 1px solid #dee2e6;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .banner-content h1 {
        font-size: 2rem;
    }
    
    .banner-content p {
        font-size: 1rem;
    }
    
    .page-title h1 {
        font-size: 2rem;
    }
    
    .timeline::before {
        left: 2rem;
    }
    
    .timeline-content {
        width: calc(100% - 4rem);
        left: 4rem !important;
    }
    
    .card {
        margin-bottom: 1rem;
    }
}

@media (max-width: 576px) {
    .navbar-brand {
        font-size: 1.25rem;
    }
    
    .banner-content h1 {
        font-size: 1.75rem;
    }
    
    .page-title h1 {
        font-size: 1.75rem;
    }
    
    .btn-primary,
    .btn-outline-primary {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
}

/* 自定义工具类 */
.py-10 {
    padding-top: 6rem;
    padding-bottom: 6rem;
}

.hover-shadow {
    transition: box-shadow 0.3s ease;
}

.hover-shadow:hover {
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.counter-item {
    text-align: center;
    padding: 1rem;
}

.counter-item h3 {
    font-size: 2rem;
    font-weight: bold;
    color: #007bff;
    margin-bottom: 0.5rem;
}

.counter-item p {
    font-size: 1rem;
    color: #666;
    margin: 0;
}

.contact-info .info-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 1.5rem;
}

.contact-info .icon-box {
    margin-right: 1rem;
    margin-bottom: 0;
}

.contact-info h4 {
    font-size: 1.1rem;
    font-weight: bold;
    margin-bottom: 0.25rem;
}

.contact-info p {
    margin: 0;
    color: #666;
}

/* 产品图片占位符 */
.product-img,
.case-img,
.news-img,
.case-detail-img,
.case-thumb {
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.product-img:nth-child(1),
.case-img:nth-child(1),
.news-img:nth-child(1),
.case-detail-img:nth-child(1) {
    background-color: #007bff;
}

.product-img:nth-child(2),
.case-img:nth-child(2),
.news-img:nth-child(2),
.case-thumb:nth-child(2) {
    background-color: #6c757d;
}

.product-img:nth-child(3),
.case-img:nth-child(3),
.news-img:nth-child(3),
.case-thumb:nth-child(3) {
    background-color: #28a745;
}

.product-img:nth-child(4),
.case-img:nth-child(4),
.news-img:nth-child(4) {
    background-color: #dc3545;
}

.product-img:nth-child(5),
.case-img:nth-child(5),
.news-img:nth-child(5) {
    background-color: #ffc107;
}

.product-img:nth-child(6),
.case-img:nth-child(6) {
    background-color: #17a2b8;
}