/**
 * Lesson Viewer Styles
 * Phase 3: Lesson Content Display
 *
 * Full lesson viewer with sidebar navigation
 */

/* ============================================
   Lesson Viewer Layout
   ============================================ */
.sffc-lesson-viewer-wrapper {
    display: grid;
    grid-template-columns: 320px 1fr;
    min-height: 100vh;
    background: var(--linkedin-bg, #F4F2EE);
}

/* ============================================
   Lesson Sidebar
   ============================================ */
.sffc-lesson-sidebar {
    background: var(--linkedin-card, #FFFFFF);
    border-right: 1px solid var(--linkedin-border, #E0DDD7);
    overflow-y: auto;
    position: sticky;
    top: 0;
    height: 100vh;
}

.sffc-lesson-sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--linkedin-border, #E0DDD7);
}

.sffc-back-to-course {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--senna-primary, #2F5233);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    transition: opacity 0.2s;
}

.sffc-back-to-course:hover {
    opacity: 0.7;
}

.sffc-lesson-progress-overview {
    padding: 24px 20px;
    text-align: center;
    border-bottom: 1px solid var(--linkedin-border, #E0DDD7);
}

.sffc-progress-circle {
    margin: 0 auto 12px;
    width: 60px;
    height: 60px;
}

.sffc-progress-label {
    font-size: 13px;
    color: var(--linkedin-text-muted, #666666);
    margin: 0;
}

/* ============================================
   Module Navigation
   ============================================ */
.sffc-lesson-nav {
    padding: 16px 0;
}

.sffc-module-nav-item {
    margin-bottom: 8px;
}

.sffc-module-nav-header {
    padding: 12px 20px;
    cursor: pointer;
}

.sffc-module-nav-number {
    display: block;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--senna-primary, #2F5233);
    letter-spacing: 0.5px;
}

.sffc-module-nav-title {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--linkedin-text, #191919);
    margin-top: 4px;
}

.sffc-module-nav-item.active .sffc-module-nav-header {
    background: var(--linkedin-hover, #F0EDE8);
}

.sffc-lesson-nav-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sffc-lesson-nav-item {
    position: relative;
}

.sffc-lesson-nav-item a,
.sffc-lesson-nav-item .sffc-lesson-nav-locked {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 20px 10px 40px;
    text-decoration: none;
    color: var(--linkedin-text, #191919);
    font-size: 14px;
    transition: all 0.2s;
}

.sffc-lesson-nav-item a:hover {
    background: var(--linkedin-hover, #F0EDE8);
}

.sffc-lesson-nav-item.current a {
    background: #E8F4E9;
    color: var(--senna-primary, #2F5233);
    font-weight: 600;
    border-left: 3px solid var(--senna-primary, #2F5233);
}

.sffc-lesson-nav-item.completed a {
    opacity: 0.7;
}

.sffc-lesson-nav-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.sffc-lesson-nav-item.completed .sffc-lesson-nav-icon {
    color: #10B981;
}

.sffc-lesson-number {
    font-size: 12px;
    font-weight: 600;
    color: var(--linkedin-text-muted, #666666);
}

.sffc-lesson-nav-text {
    flex: 1;
    line-height: 1.4;
}

.sffc-lesson-nav-locked {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ============================================
   Lesson Main Content
   ============================================ */
.sffc-lesson-main {
    overflow-y: auto;
    padding: 40px;
    max-width: 900px;
    margin: 0 auto;
}

.sffc-lesson-content-wrapper {
    background: var(--linkedin-card, #FFFFFF);
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.sffc-lesson-header {
    margin-bottom: 32px;
}

.sffc-lesson-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 12px;
}

.sffc-lesson-module {
    display: inline-block;
    padding: 4px 12px;
    background: var(--senna-primary, #2F5233);
    color: #FFFFFF;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
}

.sffc-lesson-duration {
    font-size: 14px;
    color: var(--linkedin-text-muted, #666666);
}

.sffc-lesson-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--linkedin-text, #191919);
    margin: 0;
    line-height: 1.3;
}

/* ============================================
   Lesson Content Styling
   ============================================ */
.sffc-lesson-body {
    color: var(--linkedin-text, #191919);
    font-size: 16px;
    line-height: 1.7;
}

.lesson-content h2 {
    font-size: 28px;
    font-weight: 700;
    margin: 32px 0 16px 0;
    color: var(--linkedin-text, #191919);
}

.lesson-content h3 {
    font-size: 22px;
    font-weight: 600;
    margin: 28px 0 12px 0;
    color: var(--linkedin-text, #191919);
}

.lesson-content h4 {
    font-size: 18px;
    font-weight: 600;
    margin: 24px 0 12px 0;
    color: var(--senna-primary, #2F5233);
}

.lesson-content p {
    margin: 0 0 16px 0;
}

.lesson-content ul,
.lesson-content ol {
    margin: 0 0 16px 20px;
    padding: 0;
}

.lesson-content li {
    margin-bottom: 8px;
}

.lesson-content strong {
    font-weight: 600;
    color: var(--linkedin-text, #191919);
}

.lesson-intro {
    padding: 20px;
    background: #FEF3C7;
    border-left: 4px solid #F59E0B;
    border-radius: 8px;
    margin-bottom: 24px;
}

.lesson-intro p {
    margin: 0;
    font-size: 16px;
    line-height: 1.6;
}

.formula-box {
    padding: 20px;
    background: #F0F9FF;
    border: 2px solid #0EA5E9;
    border-radius: 8px;
    margin: 20px 0;
    font-family: 'Courier New', monospace;
    font-size: 15px;
}

.calculation-example {
    padding: 20px;
    background: #F0FDF4;
    border-left: 4px solid #10B981;
    border-radius: 8px;
    margin: 20px 0;
}

.calculation-example p {
    margin: 8px 0;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

.data-table th,
.data-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--linkedin-border, #E0DDD7);
}

.data-table th {
    background: var(--linkedin-hover, #F0EDE8);
    font-weight: 600;
    color: var(--senna-primary, #2F5233);
}

.data-table tr:hover {
    background: var(--linkedin-hover, #F0EDE8);
}

.step-by-step h4 {
    margin-top: 24px;
}

.warning-box {
    padding: 20px;
    background: #FEF2F2;
    border-left: 4px solid #EF4444;
    border-radius: 8px;
    margin: 24px 0;
}

.warning-box h4 {
    margin-top: 0;
    color: #DC2626;
}

.insight-box {
    padding: 20px;
    background: #EDE9FE;
    border-left: 4px solid #8B5CF6;
    border-radius: 8px;
    margin: 24px 0;
    font-style: italic;
}

.bridge-analysis,
.case-study,
.pe-perspective {
    padding: 24px;
    background: var(--linkedin-hover, #F0EDE8);
    border-radius: 8px;
    margin: 24px 0;
}

/* ============================================
   Lesson Actions
   ============================================ */
.sffc-lesson-takeaways {
    padding: 24px;
    background: #F0FDF4;
    border-radius: 8px;
    margin: 32px 0;
}

.sffc-lesson-takeaways h3 {
    margin-top: 0;
    color: var(--senna-primary, #2F5233);
}

.sffc-lesson-takeaways ul {
    margin: 0;
}

.sffc-lesson-takeaways li {
    font-weight: 500;
}

.sffc-lesson-actions {
    padding: 32px 0;
    border-top: 1px solid var(--linkedin-border, #E0DDD7);
    text-align: center;
}

.sffc-mark-complete-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: var(--senna-primary, #2F5233);
    color: #FFFFFF;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.sffc-mark-complete-btn:hover {
    background: #1F3522;
    transform: translateY(-1px);
}

.sffc-lesson-completed-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: #D1FAE5;
    color: #065F46;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
}

/* ============================================
   Lesson Navigation (Prev/Next)
   ============================================ */
.sffc-lesson-navigation {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-top: 32px;
    padding-top: 32px;
    border-top: 1px solid var(--linkedin-border, #E0DDD7);
}

.sffc-lesson-nav-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: var(--linkedin-card, #FFFFFF);
    border: 2px solid var(--linkedin-border, #E0DDD7);
    border-radius: 8px;
    text-decoration: none;
    color: var(--linkedin-text, #191919);
    transition: all 0.2s;
    flex: 1;
    max-width: 45%;
}

.sffc-lesson-nav-btn:hover {
    border-color: var(--senna-primary, #2F5233);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.sffc-lesson-nav-prev {
    justify-content: flex-start;
}

.sffc-lesson-nav-next {
    justify-content: flex-end;
    margin-left: auto;
}

.sffc-lesson-nav-btn small {
    display: block;
    font-size: 12px;
    color: var(--linkedin-text-muted, #666666);
    margin-bottom: 4px;
}

.sffc-lesson-nav-btn strong {
    display: block;
    font-size: 14px;
    font-weight: 600;
}

.next-steps {
    padding: 24px;
    background: #DBEAFE;
    border-radius: 8px;
    margin: 32px 0 0 0;
}

.next-steps h3 {
    margin-top: 0;
    color: #1E40AF;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .sffc-lesson-viewer-wrapper {
        grid-template-columns: 280px 1fr;
    }

    .sffc-lesson-main {
        padding: 24px;
    }

    .sffc-lesson-content-wrapper {
        padding: 24px;
    }
}

@media (max-width: 768px) {
    .sffc-lesson-viewer-wrapper {
        grid-template-columns: 1fr;
    }

    .sffc-lesson-sidebar {
        position: relative;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--linkedin-border, #E0DDD7);
    }

    .sffc-lesson-main {
        padding: 16px;
    }

    .sffc-lesson-content-wrapper {
        padding: 20px;
    }

    .sffc-lesson-title {
        font-size: 28px;
    }

    .lesson-content h2 {
        font-size: 24px;
    }

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

    .sffc-lesson-navigation {
        flex-direction: column;
    }

    .sffc-lesson-nav-btn {
        max-width: 100%;
    }
}