/* ===== 页面头部样式 ===== */
        .page-header {
            background: linear-gradient(135deg, var(--accent) 0%, var(--secondary) 100%);
            color: white;
            padding: 180px 0 100px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .page-header h1 {
            font-size: 4.5rem;
            font-weight: 900;
            margin-bottom: 30px;
            text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.2);
        }

        .page-header p {
            font-size: 1.5rem;
            max-width: 800px;
            margin: 0 auto 40px;
            text-shadow: 1px 1px 5px rgba(0, 0, 0, 0.2);
        }

        /* ===== 知识库分类 ===== */
        .knowledge-categories {
            background-color: white;
            position: relative;
            overflow: hidden;
        }

        .categories-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 30px;
        }

        .category-card {
            background: white;
            border-radius: 0;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            text-align: center;
            padding: 40px 20px;
            position: relative;
            z-index: 1;
            border: 1px solid rgba(0, 0, 0, 0.05);
        }

        .category-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 0;
            background: var(--primary);
            transition: var(--transition);
            z-index: -1;
        }

        .category-card:hover::before {
            height: 100%;
        }

        .category-card:hover {
            transform: translateY(-15px);
            color: white;
            border-color: var(--primary);
        }

        .category-card:hover .category-icon {
            color: white;
            transform: scale(1.3) rotate(15deg);
        }

        .category-card:hover h3 {
            color: white;
        }

        .category-icon {
            font-size: 3.5rem;
            color: var(--primary);
            margin-bottom: 25px;
            transition: var(--transition);
        }

        .category-card h3 {
            font-size: 1.4rem;
            color: var(--dark);
            margin-bottom: 15px;
            transition: var(--transition);
        }

        /* ===== 文章列表 ===== */
        .articles-list {
            background: var(--light);
            position: relative;
            overflow: hidden;
        }

        .articles-container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            gap: 50px;
        }

        .article-card {
            background: white;
            border-radius: 0;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            position: relative;
            border: 1px solid rgba(0, 0, 0, 0.05);
        }

        .article-card:hover {
            transform: translateY(-20px);
            box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
        }

        .article-image {
            height: 250px;
            overflow: hidden;
            position: relative;
        }

        .article-image::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: var(--primary);
            opacity: 0;
            transition: var(--transition);
            z-index: 1;
        }

        .article-card:hover .article-image::before {
            opacity: 0.3;
        }

        .article-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 1s ease;
        }

        .article-card:hover .article-image img {
            transform: scale(1.1);
        }

        .article-content {
            padding: 30px;
        }

        .article-content h3 {
            font-size: 1.4rem;
            color: var(--dark);
            margin-bottom: 15px;
        }

        .article-content h3 a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }

        .article-content h3 a:hover {
            color: var(--primary);
        }

        .article-meta {
            display: flex;
            align-items: center;
            margin-bottom: 15px;
            font-size: 0.9rem;
            color: var(--gray);
        }

        .article-meta span {
            margin-right: 20px;
            display: flex;
            align-items: center;
        }

        .article-meta i {
            margin-right: 5px;
            color: var(--primary);
        }

        .read-more {
            display: inline-flex;
            align-items: center;
            margin-top: 20px;
            color: var(--primary);
            font-weight: 700;
            text-decoration: none;
            position: relative;
            text-transform: uppercase;
            letter-spacing: 1px;
            font-size: 0.9rem;
        }

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

        .read-more:hover::after {
            width: 100%;
        }

        .read-more i {
            margin-left: 8px;
            transition: var(--transition);
        }

        .read-more:hover i {
            transform: translateX(5px);
        }

        /* ===== 分页样式 ===== */
        .pagination {
            display: flex;
            justify-content: center;
            align-items: center;
            margin-top: 80px;
            gap: 10px;
        }

        .page-num {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 50px;
            height: 50px;
            background: white;
            color: var(--dark);
            text-decoration: none;
            font-weight: 600;
            border: 2px solid rgba(0, 0, 0, 0.05);
            transition: var(--transition);
        }

        .page-num:hover {
            background: var(--primary);
            color: white;
            border-color: var(--primary);
            transform: translateY(-5px);
        }

        .page-num-current {
            background: var(--primary);
            color: white;
            border-color: var(--primary);
        }

        /* ===== 热门文章 ===== */
        .popular-articles {
            background-color: white;
            position: relative;
            overflow: hidden;
        }

        .popular-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 30px;
        }

        .popular-item {
            display: flex;
            align-items: center;
            padding: 20px;
            background: white;
            border-radius: 0;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border: 1px solid rgba(0, 0, 0, 0.05);
        }

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

        .popular-rank {
            font-size: 2rem;
            font-weight: 900;
            color: var(--primary);
            margin-right: 20px;
            min-width: 40px;
            text-align: center;
        }

        .popular-content h4 {
            font-size: 1.1rem;
            margin-bottom: 8px;
        }

        .popular-content h4 a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }

        .popular-content h4 a:hover {
            color: var(--primary);
        }

        .popular-content .article-meta {
            margin-bottom: 0;
        }

        /* ===== 响应式设计 ===== */
        @media (max-width: 1200px) {
            .page-header h1 {
                font-size: 4rem;
            }
        }

        @media (max-width: 992px) {
            .page-header h1 {
                font-size: 3.5rem;
            }
            
            .articles-container {
                grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            }
        }

        @media (max-width: 768px) {
            .page-header {
                padding: 150px 0 80px;
            }
            
            .page-header h1 {
                font-size: 3rem;
            }
            
            .page-header p {
                font-size: 1.3rem;
            }
            
            .categories-grid,
            .articles-container,
            .popular-list {
                grid-template-columns: 1fr;
            }
            
            .pagination {
                flex-wrap: wrap;
            }
        }

        @media (max-width: 576px) {
            .page-header h1 {
                font-size: 2.5rem;
            }
            
            .page-header p {
                font-size: 1.1rem;
            }
        }