/* Estilos principales para el sitio */

/* Variables CSS */
:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --text-color: #1e293b;
    --text-muted: #64748b;
    --bg-color: #ffffff;
    --bg-secondary: #f8fafc;
    --border-color: #e2e8f0;
    --code-bg: #f1f5f9;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
}

/* Reset y base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

/* Navegación principal */
.main-nav {
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.main-nav {
    display: flex;
    justify-content: center;
    gap: 32px;
}

.main-nav a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 6px;
    transition: all 0.2s;
}

.main-nav a:hover,
.main-nav a.active {
    background-color: var(--primary-color);
    color: white;
}

/* Container principal */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 24px;
}

/* Header de página */
.page-header {
    text-align: center;
    margin-bottom: 48px;
}

.page-header h1 {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 16px;
}

.page-header p {
    font-size: 1.25rem;
    color: var(--text-muted);
}

/* Grid de artículos */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
    margin-bottom: 48px;
}

/* Tarjetas de artículos */
.article-card {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.article-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.article-card.featured {
    border: 2px solid var(--primary-color);
    background: linear-gradient(135deg, var(--bg-color) 0%, #f8fafc 100%);
}

.article-card.coming-soon {
    opacity: 0.7;
    background-color: var(--bg-secondary);
}

.article-header {
    margin-bottom: 16px;
}

.article-series {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    font-size: 12px;
    font-weight: 600;
    padding: 4px 8px;
    border-radius: 4px;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.article-card h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
}

.article-card h2 a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.2s;
}

.article-card h2 a:hover {
    color: var(--primary-color);
}

.article-card.coming-soon h2 {
    color: var(--text-muted);
}

.article-excerpt {
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 16px;
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    color: var(--text-muted);
}

.reading-time {
    display: flex;
    align-items: center;
    gap: 4px;
}

.article-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.tag {
    background-color: var(--code-bg);
    color: var(--text-color);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.coming-soon-badge {
    background-color: var(--warning-color);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
}

/* Navegación de series */
.series-navigation {
    background-color: var(--bg-secondary);
    border-radius: 12px;
    padding: 24px;
    margin-top: 48px;
}

.series-navigation h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--text-color);
}

.series-list {
    display: grid;
    gap: 24px;
}

.series-item h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-color);
}

.series-item ol {
    list-style: none;
    counter-reset: step-counter;
    padding-left: 0;
}

.series-item li {
    counter-increment: step-counter;
    margin-bottom: 8px;
    padding-left: 32px;
    position: relative;
}

.series-item li::before {
    content: counter(step-counter);
    position: absolute;
    left: 0;
    top: 0;
    background-color: var(--primary-color);
    color: white;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
}

.series-item li.coming-soon::before {
    background-color: var(--text-muted);
}

.series-item li a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.series-item li a:hover {
    text-decoration: underline;
}

.series-item li.coming-soon {
    color: var(--text-muted);
}

/* Footer */
.main-footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 24px 0;
    text-align: center;
    margin-top: 64px;
}

.main-footer p {
    color: var(--text-muted);
    font-size: 14px;
}

/* Responsivo */
@media (max-width: 768px) {
    .container {
        padding: 24px 16px;
    }
    
    .page-header h1 {
        font-size: 2.5rem;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .article-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    
    .main-nav {
        gap: 16px;
        padding: 12px 16px;
    }
    
    .series-navigation {
        padding: 16px;
    }
}

@media (max-width: 480px) {
    .page-header h1 {
        font-size: 2rem;
    }
    
    .article-card {
        padding: 16px;
    }
    
    .main-nav {
        flex-direction: column;
        gap: 8px;
    }
}