/* 文章页面现代化样式 */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --background-color: #ffffff;
    --text-color: #333333;
    --card-bg: #f8f9fa;
    --border-color: #dee2e6;
    --hover-color: #0056b3;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --transition: all 0.3s ease;
}

/* 深色模式变量 */
[data-theme="dark"] {
    --background-color: #1a1a1a;
    --text-color: #ffffff;
    --card-bg: #2d2d2d;
    --border-color: #404040;
    --secondary-color: #a0a0a0;
}

/* 文章列表样式 */
.articles-section {
    padding: 40px 0;
    background-color: var(--background-color);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.article-card {
    background: var(--card-bg);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    position: relative;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.15);
}

.article-image {
    width: 100%;
    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(1.05);
}

.article-content {
    padding: 20px;
}

.article-title {
    font-size: 1.25rem;
    margin: 0 0 10px 0;
    color: var(--text-color);
}

.article-description {
    color: var(--secondary-color);
    font-size: 0.9rem;
    margin-bottom: 15px;
    line-height: 1.5;
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    font-size: 0.85rem;
    color: var(--secondary-color);
}

.article-tags {
    display: flex;
    gap: 8px;
    margin-bottom: 15px;
}

.tag {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    color: white;
}

.tag.beginner {
    background-color: var(--success-color);
}

.tag.intermediate {
    background-color: var(--warning-color);
    color: #000;
}

.tag.advanced {
    background-color: var(--danger-color);
}

.article-link {
    display: inline-flex;
    align-items: center;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.article-link i {
    margin-left: 5px;
    transition: var(--transition);
}

.article-link:hover {
    color: var(--hover-color);
}

.article-link:hover i {
    transform: translateX(5px);
}

/* 分类筛选 */
.filter-section {
    max-width: 1200px;
    margin: 0 auto 30px;
    padding: 0 20px;
}

.filter-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.filter-button {
    padding: 8px 16px;
    border: none;
    border-radius: 20px;
    background: var(--card-bg);
    color: var(--text-color);
    cursor: pointer;
    transition: var(--transition);
}

.filter-button:hover,
.filter-button.active {
    background: var(--primary-color);
    color: white;
}

/* 搜索栏 */
.search-bar {
    margin-bottom: 30px;
    position: relative;
}

.search-bar input {
    width: 100%;
    padding: 12px 20px;
    border: none;
    border-radius: 25px;
    background: var(--card-bg);
    color: var(--text-color);
    font-size: 1rem;
}

.search-bar i {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--secondary-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .articles-grid {
        grid-template-columns: 1fr;
    }

    .filter-buttons {
        justify-content: center;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.article-card {
    animation: fadeIn 0.5s ease-out forwards;
}