:root {
    --primary-color: #0d6efd;
    --dark-bg: #1a1a2e;
}

body {
    background-color: #f8f9fa;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Tarjetas de artículos */
.card-article {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: none;
    border-radius: 15px;
    overflow: hidden;
    margin-bottom: 25px;
    height: 100%;
}

.card-article:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.card-article img {
    height: 200px;
    object-fit: cover;
}

/* Sidebar */
.sidebar-card {
    background: white;
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 25px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

/* Botones */
.btn-custom {
    border-radius: 25px;
    padding: 8px 20px;
}

/* Contenido del artículo */
.article-content {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #333;
}

.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    margin: 20px 0;
}

/* Comentarios */
.comment {
    background: #f8f9fa;
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 15px;
}

.comment-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
}

/* Footer */
footer {
    background: var(--dark-bg);
    color: white;
    padding: 40px 0 20px;
    margin-top: 50px;
}

/* Responsive */
@media (max-width: 768px) {
    .card-article img {
        height: 150px;
    }
    
    .article-content {
        font-size: 1rem;
    }
    
    .sidebar-card {
        padding: 15px;
    }
}

/* Loader */
.loader {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}