.knowledge-header {
    background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
    color: white;
    padding: 3rem 0;
    text-align: center;
}

.category-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: 30px;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.articles-container {
    max-width: 1000px;
    margin: -2rem auto 3rem;
    padding: 0 1rem;
}

.articles-grid {
    display: grid;
    gap: 1.5rem;
    margin-top:5rem;
}

.article-card {
    background: white;
    border-radius: 12px;
    padding: 1.75rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    border-left: 4px solid #3b82f6;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(59, 130, 246, 0.15);
    border-left-color: #10b981;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
    font-size: 0.85rem;
    color: #6b7280;
}

.article-tag {
    background: #e0f2fe;
    color: #0369a1;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.article-date {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.article-title {
    font-size: 1.3rem;
    margin: 0 0 0.75rem 0;
    line-height: 1.4;
}

.article-title a {
    color: #1f2937;
    text-decoration: none;
    transition: color 0.2s;
}

.article-title a:hover {
    color: #3b82f6;
}

.article-excerpt {
    color: #4b5563;
    line-height: 1.6;
    margin-bottom: 1.25rem;
    flex-grow: 1;
}

.read-more {
    display: inline-flex;
    align-items: center;
    color: #3b82f6;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    align-self: flex-start;
}

.read-more::after {
    content: '→';
    margin-left: 0.5rem;
    transition: transform 0.2s;
}

.read-more:hover::after {
    transform: translateX(3px);
}

/* 分页样式 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid #e5e7eb;
}

.page-link {
    padding: 0.5rem 1rem;
    border-radius: 6px;
    text-decoration: none;
    color: #4b5563;
    border: 1px solid #d1d5db;
    transition: all 0.2s;
}

.page-link:hover {
    background: #f3f4f6;
    border-color: #9ca3af;
}

.page-link.active {
    background: #3b82f6;
    color: white;
    border-color: #3b82f6;
}

/* 侧边栏（可选） */
.sidebar {
    background: #f9fafb;
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    margin-top:5rem;
}

.sidebar h3 {
    color: #1f2937;
    margin-top: 0;
    font-size: 1.1rem;
}

@media (min-width: 768px) {
    .articles-container {
        display: grid;
        grid-template-columns: 1fr 300px;
        gap: 3rem;
        margin-top: -3rem;
    }
    
    .articles-grid {
        grid-column: 1;
    }
    
    .sidebar {
        grid-column: 2;
        align-self: start;
        position: sticky;
        top: 2rem;
    }
}

@media (max-width: 767px) {
    .knowledge-header {
        padding: 2rem 0;
    }
    
    .articles-container {
        margin-top: -1rem;
    }
}