/* 页面标题区 */
        .page-header {
            background: linear-gradient(135deg, var(--primary) 0%, #1e40af 100%);
            color: white;
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        
        .page-header::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="none"><path d="M0,0 L100,0 L100,100 Z" fill="rgba(255,255,255,0.05)"/></svg>');
            background-size: cover;
        }
        
        .page-header h1 {
            font-size: 2.8rem;
            margin-bottom: 20px;
            position: relative;
            animation: fadeInUp 0.8s ease;
        }
        
        .page-header p {
            font-size: 1.2rem;
            max-width: 700px;
            margin: 0 auto;
            opacity: 0.9;
            position: relative;
            animation: fadeInUp 1s ease;
        }
        
        /* 知识库内容区 */
        .knowledge-base {
            padding: 80px 0;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 50px;
        }
        
        .section-title h2 {
            font-size: 2.2rem;
            color: var(--primary);
            position: relative;
            display: inline-block;
            padding-bottom: 15px;
        }
        
        .section-title h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 3px;
            background-color: var(--secondary);
        }
        
        .search-box {
            max-width: 600px;
            margin: 0 auto 60px;
            position: relative;
        }
        
        .search-box input {
            width: 100%;
            padding: 15px 25px;
            border: 2px solid #e2e8f0;
            border-radius: 50px;
            font-size: 1.1rem;
            transition: var(--transition);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        
        .search-box input:focus {
            outline: none;
            border-color: var(--accent);
            box-shadow: 0 5px 15px rgba(62, 146, 204, 0.1);
        }
        
        .search-box button {
            position: absolute;
            right: 5px;
            top: 5px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: 50px;
            padding: 10px 25px;
            cursor: pointer;
            transition: var(--transition);
        }
        
        .search-box button:hover {
            background: var(--secondary);
            color: var(--dark);
        }
        
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            gap: 30px;
        }
        
        .article-card {
            background-color: white;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            transition: var(--transition);
            opacity: 0;
            transform: translateY(20px);
            animation: fadeInUp 0.6s ease forwards;
        }
        
        .article-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
        }
        
        .article-card:nth-child(1) { animation-delay: 0.1s; }
        .article-card:nth-child(2) { animation-delay: 0.2s; }
        .article-card:nth-child(3) { animation-delay: 0.3s; }
        .article-card:nth-child(4) { animation-delay: 0.4s; }
        .article-card:nth-child(5) { animation-delay: 0.5s; }
        .article-card:nth-child(6) { animation-delay: 0.6s; }
        .article-card:nth-child(7) { animation-delay: 0.7s; }
        .article-card:nth-child(8) { animation-delay: 0.8s; }
        .article-card:nth-child(9) { animation-delay: 0.9s; }
        
        .article-image {
            height: 200px;
            overflow: hidden;
            position: relative;
        }
        
        .article-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        
        .article-card:hover .article-image img {
            transform: scale(1.1);
        }
        
        .article-category {
            position: absolute;
            top: 15px;
            right: 15px;
            background: var(--secondary);
            color: var(--dark);
            padding: 5px 15px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
        }
        
        .article-content {
            padding: 25px;
        }
        
        .article-content h3 {
            margin-bottom: 12px;
            color: var(--primary);
            font-size: 1.3rem;
            transition: var(--transition);
        }
        
        .article-card:hover .article-content h3 {
            color: var(--secondary);
        }
        
        .article-content p {
            color: #666;
            margin-bottom: 20px;
            font-size: 0.95rem;
        }
        
        .article-meta {
            display: flex;
            justify-content: space-between;
            color: #777;
            font-size: 0.9rem;
            margin-top: 20px;
            padding-top: 15px;
            border-top: 1px solid #eee;
        }
        
        .article-meta span {
            display: flex;
            align-items: center;
        }
        
        .article-meta i {
            margin-right: 5px;
        }
        
        .read-more {
            display: inline-block;
            color: var(--primary);
            font-weight: 600;
            transition: var(--transition);
        }
        
        .read-more:hover {
            color: var(--secondary);
            transform: translateX(5px);
        }
        
     /* 分页控件 */
         .pagination {
            display: flex;
            justify-content: center;
            gap: 10px;
            margin-top: 60px;
        }
        
        .page-num {
            width: 45px;
            height: 45px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
            background: white;
            color: var(--primary);
            font-weight: 600;
            box-shadow: var(--shadow-light);
            transition: all 0.3s ease;
            cursor: pointer;
        }
        
        .page-num:hover,
        .page-num.active {
            background: var(--primary);
            color: var(--light);
            transform: translateY(-3px);
        }
        
        .page-num.dots {
            background: transparent;
            box-shadow: none;
            cursor: default;
        }
        
        .page-num.dots:hover {
            transform: none;
        }
        
        
        /* 动画效果 */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
    
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            nav ul {
                display: none;
            }
            
            .mobile-menu-btn {
                display: block;
            }
            
            .page-header h1 {
                font-size: 2.2rem;
            }
            
            .section-title h2 {
                font-size: 1.8rem;
            }
        }
        
        @media (max-width: 768px) {
            .articles-grid {
                grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            }
            
            .page-header {
                padding: 60px 0;
            }
            
            .page-header h1 {
                font-size: 2rem;
            }
            
            .footer-bottom-content {
                flex-direction: column;
                text-align: center;
            }
            
            .friend-links {
                justify-content: center;
                margin-bottom: 20px;
            }
        }
        
        @media (max-width: 576px) {
            .logo h1 {
                font-size: 1.5rem;
            }
            
            .page-header h1 {
                font-size: 1.8rem;
            }
            
            .page-header p {
                font-size: 1rem;
            }
            
            .articles-grid {
                grid-template-columns: 1fr;
            }
            
            .article-card {
                max-width: 100%;
            }
        }