/* Course Page Styles */

.course-page {
    padding: 3rem 0;
    min-height: calc(100vh - 80px);
}

.course-header {
    background: var(--color-card);
    padding: 2.5rem;
    border-radius: 16px;
    margin-bottom: 2rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    margin-bottom: 1rem;
    color: var(--color-text-secondary);
}

.breadcrumb a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

.breadcrumb a:hover {
    color: var(--color-text);
}

.course-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--color-text);
}

.course-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.course-description {
    font-size: 1.125rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
}

.course-content {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 2rem;
    align-items: start;
}

@media (max-width: 768px) {
    .course-content {
        grid-template-columns: 1fr;
    }

    .course-sidebar {
        order: -1;
    }
}

.course-main {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.course-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.lessons-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.lesson-item {
    display: grid;
    grid-template-columns: 40px 1fr auto;
    gap: 1rem;
    align-items: center;
    padding: 1.25rem;
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    transition: all 0.2s;
}

.lesson-item:hover {
    border-color: var(--color-text);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.lesson-number {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-text);
    color: var(--color-background);
    border-radius: 50%;
    font-weight: 700;
    font-size: 1.125rem;
}

.lesson-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--color-text);
}

.lesson-content p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: 0.5rem;
}

.lesson-duration {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
}

.sidebar-info {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.info-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.info-item i {
    width: 20px;
    color: var(--color-text-secondary);
    margin-top: 2px;
}

.info-item strong {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--color-text-secondary);
    margin-bottom: 0.25rem;
    letter-spacing: 0.5px;
}

.info-item span {
    color: var(--color-text);
}

.progress-stats {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.stat {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.stat-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--color-border);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--color-text);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.alert {
    padding: 1rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.alert-success {
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    color: #15803d;
}

.alert-error {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #dc2626;
}

.alert-info {
    background: var(--color-background);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
}

.text-muted {
    color: var(--color-text-secondary);
}