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

.welcome-section {
    border-left: 4px solid #0d6efd;
}

.article-card {
    background: white;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.article-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.article-date {
    font-size: 0.9rem;
    color: #6c757d;
}

.article-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: #212529;
    margin: 10px 0;
}

.article-excerpt {
    color: #495057;
    line-height: 1.6;
}

.article-thumbnail {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 8px;
    margin-top: 15px;
}

.read-more {
    color: #0d6efd;
    font-weight: 500;
    text-decoration: none;
}

.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 15px 0;
}

.article-content {
    line-height: 1.8;
    font-size: 1.1rem;
}

.article-content h2 {
    margin-top: 30px;
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.article-content h3 {
    margin-top: 25px;
    margin-bottom: 12px;
    font-size: 1.3rem;
}

.article-content p {
    margin-bottom: 15px;
}

.article-content ul, .article-content ol {
    margin-bottom: 15px;
    padding-left: 25px;
}

.article-content li {
    margin-bottom: 8px;
}

.badge-lesson {
    background-color: #0d6efd;
    color: white;
    padding: 5px 12px;
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 500;
}

footer {
    margin-top: auto;