/* ========================================
   DAD LESSONS PAGE - GLASS MORPHISM DESIGN
   Modern, clean styling for content pages
   ======================================== */

/* Page Header */
.page-header {
    padding: var(--space-2xl) 0 var(--space-xl);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    animation: fadeIn 0.8s ease-out;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--color-primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: var(--space-md);
    transition: all var(--transition-fast);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
}

.back-link:hover {
    background: rgba(99, 102, 241, 0.08);
    transform: translateX(-4px);
}

.page-title {
    font-size: clamp(36px, 5vw, 52px);
    margin-bottom: var(--space-sm);
    font-weight: 800;
}

.page-subtitle {
    font-size: 18px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* Intro section */
.intro {
    padding: var(--space-xl) 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    font-size: 17px;
    line-height: 1.7;
    opacity: 0;
    animation: fadeInUp 0.8s ease-out 0.2s forwards;
}

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

/* Lessons section */
.lessons-section {
    padding: var(--space-2xl) 0;
}

.lessons-section-title {
    font-size: 32px;
    margin-bottom: var(--space-xl);
    opacity: 0;
    animation: fadeInUp 0.8s ease-out 0.4s forwards;
    font-weight: 700;
}

/* Lesson cards with glass effect */
.lesson-card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(var(--blur-md));
    -webkit-backdrop-filter: blur(var(--blur-md));
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-2xl);
    padding: var(--space-xl);
    margin-bottom: var(--space-xl);
    transition: all var(--transition-base);
    opacity: 0;
    animation: fadeInUp 0.8s ease-out 0.6s forwards;
    box-shadow: var(--shadow-lg);
}

.lesson-card:hover {
    background: rgba(255, 255, 255, 0.85);
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: var(--shadow-xl);
    transform: translateY(-4px);
}

.lesson-status {
    display: inline-block;
    background: rgba(99, 102, 241, 0.1);
    color: var(--color-primary);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-sm);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.lesson-title {
    font-size: 28px;
    margin-bottom: var(--space-sm);
    color: var(--color-text);
    font-weight: 700;
}

.lesson-intro {
    font-size: 16px;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    line-height: 1.6;
}

.lesson-content {
    margin-top: var(--space-lg);
}

.lesson-content h3 {
    font-size: 22px;
    font-weight: 600;
    margin: var(--space-lg) 0 var(--space-sm);
    color: var(--color-text);
}

.lesson-content h3:first-of-type {
    margin-top: 0;
}

.lesson-content p {
    margin-bottom: var(--space-sm);
    line-height: 1.7;
    color: var(--color-text-secondary);
    font-size: 15px;
}

.lesson-content ul {
    margin-left: var(--space-lg);
    margin-top: var(--space-sm);
    line-height: 1.8;
}

.lesson-content ul li {
    margin-bottom: var(--space-xs);
    color: var(--color-text-secondary);
    font-size: 15px;
}

/* Key concept callout */
.key-concept {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.06) 0%, rgba(139, 92, 246, 0.06) 100%);
    border-left: 3px solid var(--color-primary);
    padding: var(--space-md);
    margin: var(--space-md) 0;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(99, 102, 241, 0.15);
}

.key-concept strong {
    font-size: 16px;
    display: block;
    margin-bottom: var(--space-xs);
    color: var(--color-text);
    font-weight: 600;
}

.key-concept p {
    font-size: 14px;
}

/* Formula display */
.formula {
    font-family: var(--font-mono);
    background: linear-gradient(135deg, #1a1d29 0%, #2d3748 100%);
    color: #e5e7eb;
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    margin: var(--space-md) 0;
    font-size: 15px;
    overflow-x: auto;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

/* Example callout */
.example {
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.06) 0%, rgba(99, 102, 241, 0.06) 100%);
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    margin: var(--space-md) 0;
    border: 1px solid rgba(6, 182, 212, 0.15);
}

.example strong {
    font-weight: 600;
    display: block;
    margin-bottom: var(--space-sm);
    color: var(--color-text);
    font-size: 15px;
}

.example p {
    font-size: 14px;
}

/* Lesson summary */
.lesson-summary {
    margin-top: var(--space-lg);
}

.lesson-summary p {
    margin-bottom: var(--space-sm);
    line-height: 1.7;
    color: var(--color-text-secondary);
    font-size: 15px;
}

.lesson-summary ul {
    margin-left: var(--space-xl);
    margin-top: var(--space-sm);
    line-height: 1.8;
}

.lesson-summary ul li {
    margin-bottom: var(--space-sm);
    color: var(--color-text-secondary);
    font-size: 15px;
}

/* Lesson link */
.lesson-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    background: var(--color-primary);
    color: white;
    padding: 12px 24px;
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 600;
    font-size: 15px;
    transition: all var(--transition-base);
    margin-top: var(--space-lg);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
}

.lesson-link:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.35);
    color: white;
}

/* Download link */
.download-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    background: var(--color-primary);
    color: white;
    padding: 12px 24px;
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 600;
    font-size: 15px;
    transition: all var(--transition-base);
    margin-top: var(--space-md);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
}

.download-link:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.35);
    color: white;
}

/* Upcoming topics section */
.upcoming-topics {
    margin-top: var(--space-2xl);
    padding-top: var(--space-2xl);
    border-top: 1px solid rgba(0, 0, 0, 0.06);
}

.topic-list {
    display: grid;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
}

.topic-item {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(var(--blur-sm));
    -webkit-backdrop-filter: blur(var(--blur-sm));
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.topic-item:hover {
    background: rgba(255, 255, 255, 0.85);
    border-color: rgba(99, 102, 241, 0.3);
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.topic-icon {
    font-size: 24px;
    flex-shrink: 0;
}

.topic-title {
    font-weight: 600;
    font-size: 16px;
    color: var(--color-text);
}

.topic-status {
    margin-left: auto;
    color: var(--color-text-tertiary);
    font-size: 13px;
    font-style: italic;
}

/* Footer */
.lessons-footer {
    padding: var(--space-xl) 0;
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 14px;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
    margin-top: var(--space-2xl);
}

.lessons-footer a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
}

.lessons-footer a:hover {
    color: var(--color-primary-dark);
}

/* Responsive */
@media (max-width: 768px) {
    .page-title {
        font-size: 32px;
    }

    .lesson-card {
        padding: var(--space-lg);
    }

    .lesson-title {
        font-size: 24px;
    }

    .intro {
        font-size: 16px;
    }

    .topic-title {
        font-size: 15px;
    }
}

@media (max-width: 480px) {
    .page-header {
        padding: var(--space-xl) 0 var(--space-lg);
    }

    .lesson-card {
        padding: var(--space-md);
    }

    .lesson-content h3 {
        font-size: 20px;
    }
}