/* Cursos y catálogo */
.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-6);
}

.course-card {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 0;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.course-card:hover {
    transform: translateY(-6px);
}

.course-card__image {
    height: 168px;
    background:
        linear-gradient(160deg, rgba(34, 211, 238, 0.15) 0%, transparent 50%),
        linear-gradient(135deg, var(--color-bg-elevated), rgba(109, 40, 217, 0.35));
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.course-card--beginner .course-card__image {
    background:
        linear-gradient(160deg, rgba(52, 211, 153, 0.2) 0%, transparent 50%),
        linear-gradient(135deg, var(--color-bg-elevated), rgba(8, 145, 178, 0.25));
}

.course-card--intermediate .course-card__image {
    background:
        linear-gradient(160deg, rgba(34, 211, 238, 0.2) 0%, transparent 50%),
        linear-gradient(135deg, var(--color-bg-elevated), rgba(109, 40, 217, 0.3));
}

.course-card--advanced .course-card__image {
    background:
        linear-gradient(160deg, rgba(139, 92, 246, 0.25) 0%, transparent 50%),
        linear-gradient(135deg, var(--color-bg-elevated), rgba(59, 130, 246, 0.3));
}

.course-card--cat-ia .course-card__image {
    background:
        linear-gradient(160deg, rgba(34, 211, 238, 0.22) 0%, transparent 50%),
        linear-gradient(135deg, var(--color-bg-elevated), rgba(8, 145, 178, 0.35));
}

.course-card--cat-agentes .course-card__image {
    background:
        linear-gradient(160deg, rgba(139, 92, 246, 0.22) 0%, transparent 50%),
        linear-gradient(135deg, var(--color-bg-elevated), rgba(109, 40, 217, 0.4));
}

.course-card--cat-automatizacion .course-card__image {
    background:
        linear-gradient(160deg, rgba(59, 130, 246, 0.22) 0%, transparent 50%),
        linear-gradient(135deg, var(--color-bg-elevated), rgba(34, 211, 238, 0.2));
}

.course-card--cat-desarrollo .course-card__image {
    background:
        linear-gradient(160deg, rgba(52, 211, 153, 0.18) 0%, transparent 50%),
        linear-gradient(135deg, var(--color-bg-elevated), rgba(59, 130, 246, 0.25));
}

.course-card__image-icon {
    font-size: 2.75rem;
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.3));
}

.course-card__image-pattern {
    position: absolute;
    inset: 0;
    opacity: 0.15;
    background-image:
        linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
    background-size: 20px 20px;
}

.course-card__body {
    padding: var(--space-5) var(--space-6) var(--space-6);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.course-card__meta {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-3);
    flex-wrap: wrap;
}

.course-card__tag {
    font-size: var(--font-size-xs);
    font-weight: 600;
    padding: 3px 10px;
    border-radius: var(--radius-full);
    background: rgba(34, 211, 238, 0.1);
    color: var(--color-accent-soft);
    border: 1px solid rgba(34, 211, 238, 0.15);
}

.course-card__tag--free {
    background: rgba(52, 211, 153, 0.1);
    color: var(--color-green-light);
    border-color: rgba(52, 211, 153, 0.2);
}

.course-card__title {
    font-family: var(--font-display);
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-2);
    line-height: 1.3;
    color: var(--color-text-primary);
}

.course-card__title a {
    color: var(--color-text-primary);
    text-decoration: none;
}

.course-card__title a:hover {
    color: var(--color-accent-soft);
}

.course-card__summary {
    font-size: var(--font-size-sm);
    flex: 1;
    margin-bottom: var(--space-4);
    line-height: 1.65;
}

.filter-chip__count {
    font-size: var(--font-size-xs);
    opacity: 0.75;
    margin-left: var(--space-1);
}

.catalog-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.catalog-chips .filter-chip {
    text-decoration: none;
}

.catalog-chips--levels {
    margin-bottom: var(--space-6);
}

.course-card__footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-border);
}

/* Progreso */
.progress-bar {
    height: 8px;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin: var(--space-3) 0;
}

.progress-bar__fill {
    width: var(--progress, 0%);
    height: 100%;
    background: var(--gradient-accent);
    border-radius: var(--radius-full);
    transition: width 0.4s ease;
}

/* Lección */
.learn-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--space-6);
    min-height: 70vh;
}

.learn-sidebar {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-4);
    position: sticky;
    top: calc(var(--header-height) + var(--space-4));
    max-height: calc(100vh - var(--header-height) - var(--space-8));
    overflow-y: auto;
}

.learn-sidebar__module {
    margin-bottom: var(--space-4);
}

.learn-sidebar__module-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.learn-sidebar__lesson {
    display: block;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-decoration: none;
    margin-bottom: 2px;
}

.learn-sidebar__lesson:hover,
.learn-sidebar__lesson.is-active {
    background: rgba(34, 211, 238, 0.08);
    color: var(--color-accent-soft);
}

.learn-sidebar__lesson.is-completed::before {
    content: '✓ ';
    color: var(--color-green);
}

.lesson-content {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
}

.lesson-content h1 {
    margin-bottom: var(--space-4);
}

.lesson-content__body {
    line-height: 1.8;
    margin: var(--space-6) 0;
}

.lesson-content__body h2 { margin: var(--space-6) 0 var(--space-3); }
.lesson-content__body p { margin-bottom: var(--space-4); }

.lesson-actions {
    display: flex;
    gap: var(--space-3);
    margin-top: var(--space-8);
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-border);
}

.lesson-notes textarea {
    width: 100%;
    min-height: 100px;
    padding: var(--space-3);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-primary);
    resize: vertical;
}

.quiz-form .quiz-question {
    margin-bottom: var(--space-6);
    padding: var(--space-4);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
}

.quiz-form label {
    display: block;
    margin: var(--space-2) 0;
    cursor: pointer;
}

.certificate {
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem;
    background: #fff;
    color: #1a1a2e;
    border: 8px solid var(--color-accent-dark);
    text-align: center;
    font-family: Georgia, serif;
}

.certificate__title {
    font-size: 2.5rem;
    color: var(--color-accent-dark);
    margin-bottom: 1rem;
}

.certificate__name {
    font-size: 2rem;
    font-weight: bold;
    margin: 1.5rem 0;
}

.certificate__course {
    font-size: 1.25rem;
    margin-bottom: 2rem;
}

.certificate__code {
    font-family: monospace;
    font-size: 0.875rem;
    color: #666;
    margin-top: 2rem;
}

@media print {
    .header, .footer, .lesson-actions, .no-print { display: none !important; }
    .certificate { border-width: 4px; }
}

@media (max-width: 900px) {
    .learn-layout {
        grid-template-columns: 1fr;
    }
    .learn-sidebar {
        position: static;
        max-height: none;
    }
}