/* SNAP ADS Learning Hub Styles */

/* Professional Color Palette */
:root {
    --bg-primary: #0f1419;
    --bg-secondary: #1a1f2e;
    --bg-tertiary: #252b3a;
    --text-primary: #e8eaed;
    --text-secondary: #9aa0a6;
    --text-muted: #5f6368;
    --accent-primary: #00b4d8;
    --accent-secondary: #0077b6;
    --accent-purple: #6c5ce7;
    --border-color: #2d3748;
    --success-color: #48bb78;
    --warning-color: #ed8936;
    --error-color: #f56565;
}

/* Header Navigation Vertical Alignment */
header nav .flex.space-x-8.items-center li a {
    line-height: 49.6px;
}

/* Blog Hero Section */
.blog-hero {
    background: linear-gradient(135deg, rgba(0, 180, 216, 0.1), rgba(108, 92, 231, 0.1));
    padding: 6rem 2rem 4rem 2rem;
    text-align: center;
    background-color: var(--bg-primary);
    margin-top: 80px;
}

.blog-hero .hero-content {
    margin: 0 auto;
    max-width: 800px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.blog-hero h1 {
    font-size: 1.125rem;
    color: var(--accent-primary);
    margin: 0 auto 1rem auto;
    text-align: center;
    font-weight: 700;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-weight: 500;
}

.hero-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 1.5rem;
    line-height: 1.6;
}

.course-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 2rem;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-primary);
    line-height: 1;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

/* Learning Path Section */
.learning-path {
    padding: 4rem 2rem;
    background-color: var(--bg-primary);
}

.learning-path h2 {
    text-align: center;
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 2rem;
    font-weight: 600;
}

.modules-grid {
    display: grid;
    gap: 1.5rem;
    max-width: 100%;
    margin: 0;
}

/* Module Cards */
.module-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.75rem;
    transition: all 0.2s ease;
}

.module-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 24px rgba(0, 180, 216, 0.15);
    border-color: var(--accent-primary);
}

.module-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.module-header h3 {
    font-size: 1.25rem;
    line-height: 1.25rem;
    margin: 0;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.module-header h3 a {
    color: #e0e0e0;
    text-decoration: none;
}

.module-header h3 a:hover {
    color: #00d4ff;
}

.lesson-count {
    background: rgba(0, 212, 255, 0.2);
    color: #00d4ff;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
}

.module-description {
    color: #b0b0b0;
    margin-bottom: 1rem;
    line-height: 1.5;
    font-size: 0.875rem;
}

/* Module Lessons */
.module-lessons {
    margin-bottom: 1.5rem;
}

.lesson-item {
    margin-bottom: 0.5rem;
}

.lesson-item a {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.4rem 0.8rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    text-decoration: none;
    transition: background 0.2s ease;
}

.lesson-item a:hover {
    background: rgba(0, 212, 255, 0.1);
}

.lesson-number {
    background: rgba(124, 58, 237, 0.3);
    color: #a855f7;
    padding: 0.3rem 0.6rem;
    border-radius: 50%;
    font-weight: bold;
    min-width: 2rem;
    text-align: center;
    font-size: 0.8rem;
    line-height: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    vertical-align: middle;
}

.lesson-title {
    color: #e0e0e0;
    flex: 1;
}

.lesson-difficulty {
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: bold;
}

.difficulty-beginner {
    background: rgba(34, 197, 94, 0.2);
    color: #22c55e;
}

.difficulty-intermediate {
    background: rgba(251, 191, 36, 0.2);
    color: #fbbf24;
}

.difficulty-advanced {
    background: rgba(239, 68, 68, 0.2);
    color: #ef4444;
}

.difficulty-expert {
    background: rgba(147, 51, 234, 0.2);
    color: #9333ea;
}

.start-module-btn {
    display: inline-block;
    background: linear-gradient(135deg, #00d4ff, #7c3aed);
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: bold;
    transition: transform 0.2s ease;
}

.start-module-btn:hover {
    transform: translateY(-2px);
}

/* Learning Features */
.learning-features {
    padding: 3rem 2rem;
    background: var(--bg-secondary);
}

.learning-features h2 {
    text-align: center;
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 2rem;
    font-weight: 600;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.feature-card {
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: all 0.2s ease;
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #00d4ff;
}

.feature-icon i {
    width: 48px;
    height: 48px;
    stroke-width: 1.5;
}

.feature-card h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.125rem;
    font-weight: 600;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.9375rem;
}

/* CTA Section */
.cta-section {
    padding: 3rem 2rem;
    text-align: center;
    background: var(--bg-primary);
}

.cta-content h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-weight: 600;
}

.cta-content p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.cta-button {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-purple));
    color: white;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s ease;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 180, 216, 0.3);
}

/* Modern CSS Grid Blog Layout */
.blog-layout {
    display: grid;
    grid-template-areas: 
        "header header"
        "sidebar main";
    grid-template-columns: 320px 1fr;
    grid-template-rows: auto 1fr;
    min-height: 100vh;
    background: var(--bg-primary);
}

.blog-layout header {
    grid-area: header;
    background: var(--bg-primary);
}

.blog-sidebar {
    grid-area: sidebar;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    transition: transform 0.3s ease;
    position: relative;
}

.blog-main {
    grid-area: main;
    background: var(--bg-primary);
    padding: 2rem;
    overflow-x: hidden;
}

/* Collapsed sidebar state */
.blog-layout.sidebar-collapsed {
    grid-template-columns: 40px 1fr;
}

.blog-layout.sidebar-collapsed .blog-sidebar {
    transform: translateX(-280px);
}

/* Sidebar Toggle Button */
.sidebar-toggle {
    position: absolute;
    top: 1rem;
    right: -20px;
    width: 40px;
    height: 40px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0 8px 8px 0;
    color: var(--text-primary);
    cursor: pointer;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.sidebar-toggle:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.sidebar-toggle i {
    width: 20px;
    height: 20px;
}

/* Blog Sidebar Header */
.sidebar-header {
    padding: 1.5rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h3 {
    font-size: 1.125rem;
    color: var(--text-primary);
    margin: 0;
    font-weight: 600;
}

.back-to-hub {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

.back-to-hub:hover {
    color: var(--accent-primary);
}

.back-to-hub i {
    width: 16px;
    height: 16px;
}

/* Table of Contents */
.table-of-contents {
    padding: 1.5rem 0;
}

.table-of-contents h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 1.25rem 1rem 1.25rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.toc-sections {
    max-height: 60vh;
    overflow-y: auto;
}

.toc-section {
    margin-bottom: 1.5rem;
}

.section-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: left;
    margin: 0 1.25rem 0.75rem 1.25rem;
    padding: 0.5rem 0;
}

.current-section .section-title {
    color: var(--accent-primary);
}

.chapter-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.chapter-item {
    margin: 0;
}

.chapter-link {
    display: block;
    padding: 0.5rem 1.25rem 0.5rem 2rem;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    text-decoration: none;
    line-height: 1.4;
    transition: all 0.2s ease;
    border-left: 3px solid transparent;
}

.chapter-link:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
    border-left-color: var(--accent-secondary);
}

.current-chapter .chapter-link {
    color: var(--accent-primary);
    background: var(--bg-tertiary);
    border-left-color: var(--accent-primary);
    font-weight: 500;
}

/* Blog Overview Sidebar */
.overview-stats {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.stat-item:last-child {
    border-bottom: none;
}

.stat-item .stat-number {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent-primary);
}

.stat-item .stat-label {
    font-size: 0.5rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.quick-navigation {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.quick-navigation h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.75rem 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.nav-list li {
    margin-bottom: 0.5rem;
}

.quick-navigation .nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color 0.2s ease;
}

.quick-navigation .nav-link:hover {
    color: var(--accent-primary);
}

.nav-link i {
    width: 16px;
    height: 16px;
}

.module-overview {
    padding: 1rem 1.25rem;
}

.module-overview h4 {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.5rem 0;
    padding-left: 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.module-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.module-item {
    margin-bottom: 0.5rem;
}

/* Old module-link styles removed - using expandable modules instead */

/* Expandable sidebar modules */
.module-item .module-count {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: block;
    margin-top: 0.125rem;
    padding-left: 1.5rem;
}

.module-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 1.25rem;
    line-height: 1.25rem;
    font-weight: 500;
    padding: 0;
    text-align: left;
    width: auto;
    transition: color 0.2s ease;
}

.module-toggle:hover {
    color: var(--accent-primary);
}

.chevron-icon {
    width: 16px;
    height: 16px;
    transition: transform 0.2s ease;
}

.module-toggle.expanded .chevron-icon {
    transform: rotate(90deg);
}

.lesson-list {
    list-style: none;
    margin: 0;
    padding: 0;
    padding-left: 1.5rem;
    margin-top: 0.5rem;
    border-left: 2px solid var(--border-color);
}

.lesson-list.hidden {
    display: none;
}

.lesson-item-sidebar {
    margin-bottom: 0.25rem;
    list-style: none;
    position: relative;
}

.lesson-item-sidebar::before {
    content: "•";
    color: var(--accent-primary);
    position: absolute;
    left: -1rem;
    top: 0.35rem;
    font-size: 0.75rem;
}

.lesson-item-sidebar a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.lesson-item-sidebar a:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.lesson-item-sidebar .lesson-number {
    background: rgba(124, 58, 237, 0.2);
    color: #a855f7;
    padding: 0.2rem 0.4rem;
    border-radius: 50%;
    font-weight: bold;
    min-width: 1.5rem;
    text-align: center;
    font-size: 0.75rem;
    line-height: 1;
}

.lesson-item-sidebar .lesson-title {
    flex: 1;
    font-size: 0.875rem;
}

/* Reading Progress */
.reading-progress {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

.progress-info {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.current-position {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.progress-bar {
    height: 3px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-purple));
    transition: width 0.3s ease;
}

/* Article Header */
.article-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    max-width: 100%;
    width: 100%;
    box-sizing: border-box;
}

.article-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.article-category {
    color: var(--accent-primary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 0.75rem;
}

.reading-time {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    background: linear-gradient(to right, #2563eb, #7c3aed);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 500;
}

.reading-time i {
    width: 14px;
    height: 14px;
}

.article-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.4;
    word-wrap: break-word;
    overflow-wrap: break-word;
    white-space: normal;
    width: 100%;
    display: block;
}

.article-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.5;
    max-width: 100%;
    word-wrap: break-word;
}

.article-navigation {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.article-navigation .nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 6px;
    font-size: 0.875rem;
    transition: all 0.2s ease;
    border: 1px solid var(--border-color);
    white-space: nowrap;
}

.nav-link:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

.nav-link i {
    width: 16px;
    height: 16px;
}


/* Blog Content */
.blog-content {
    line-height: 1.7;
    color: var(--text-primary);
    font-size: 1rem;
    margin-top: 2rem;
    clear: both;
    max-width: 100%;
    overflow-wrap: break-word;
}

.blog-content h1:first-child {
    display: none;
}

.blog-content h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    line-height: 1.2;
    word-wrap: break-word;
    overflow-wrap: break-word;
    max-width: 100%;
}

.blog-content h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 2rem 0 1rem 0;
    line-height: 1.3;
    word-wrap: break-word;
    overflow-wrap: break-word;
    max-width: 100%;
}

.blog-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 1.5rem 0 0.75rem 0;
    line-height: 1.4;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.blog-content p {
    margin-bottom: 1.25rem;
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
    max-width: 100%;
    word-wrap: break-word;
}

.blog-content ul, .blog-content ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
}

.blog-content li {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.blog-content code {
    background: var(--bg-tertiary);
    padding: 0.125rem 0.375rem;
    border-radius: 4px;
    font-size: 0.875rem;
    color: var(--accent-primary);
    font-family: 'SF Mono', Consolas, monospace;
}

.blog-content pre {
    background: var(--bg-secondary);
    padding: 1.25rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1.5rem 0;
    border: 1px solid var(--border-color);
    font-size: 0.9375rem;
}

.blog-content pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
}

.blog-content blockquote {
    border-left: 4px solid var(--accent-primary);
    padding-left: 1rem;
    margin: 1.5rem 0;
    font-style: italic;
    color: var(--text-secondary);
}

/* Article Footer */
.article-footer {
    margin-top: 3rem;
    padding: 2rem 0;
    border-top: 1px solid var(--border-color);
    margin-bottom: 2rem;
    width: 100%;
    box-sizing: border-box;
}

.article-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 1rem;
}

.bookmark-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.bookmark-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

.bookmark-btn i {
    width: 16px;
    height: 16px;
}

.article-share {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.article-share span {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.share-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: 6px;
    text-decoration: none;
    transition: all 0.2s ease;
}

.share-link:hover {
    background: var(--accent-primary);
    color: white;
}

.share-link i {
    width: 16px;
    height: 16px;
}

.article-pagination {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.pagination-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.2s ease;
    flex: 0 1 auto;
    min-width: 200px;
    max-width: 300px;
}

.pagination-link:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-primary);
}

.pagination-link.prev {
    justify-content: flex-start;
    margin-right: auto;
}

.pagination-link.next {
    justify-content: flex-end;
    margin-left: auto;
}

.pagination-link i {
    width: 20px;
    height: 20px;
    color: var(--text-muted);
}

.pagination-text {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    min-width: 0;
    flex: 1;
}

.pagination-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.pagination-title {
    font-size: 0.875rem;
    color: var(--text-primary);
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .blog-sidebar {
        display: none;
    }
    
    .blog-main {
        margin-left: 0;
        width: 100%;
        max-width: 100%;
        padding: 1rem;
    }
    
    .blog-hero h1 {
        font-size: 1.75rem;
    }
    
    .course-stats {
        gap: 1.5rem;
    }
    
    .modules-grid {
        padding: 0 1rem;
    }
    
    .article-navigation {
        flex-direction: column;
        align-items: stretch;
    }
    
    .article-pagination {
        flex-direction: column;
    }
    
    .pagination-link {
        max-width: 100%;
    }
    
    .module-title {
        font-size: 2rem;
    }
    
    .module-lessons-grid {
        grid-template-columns: 1fr;
    }
}
    padding: 0.5rem 1rem;
    border-radius: 8px;
    text-decoration: none;
    transition: background 0.2s ease;
}

.nav-btn:hover {
    background: rgba(0, 212, 255, 0.2);
}

.back-to-hub {
    color: #b0b0b0;
    text-decoration: none;
    font-weight: bold;
}

.back-to-hub:hover {
    color: #00d4ff;
}

/* Lesson Header */
.lesson-header {
    margin-bottom: 3rem;
}

.lesson-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.module-badge {
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: bold;
}

.lesson-number {
    background: rgba(124, 58, 237, 0.2);
    color: #a855f7;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
}

.reading-time {
    background: linear-gradient(to right, #2563eb, #7c3aed);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.lesson-title {
    font-size: 1.5rem;
    color: #e0e0e0;
    line-height: 1.25rem;
    padding: 0.75rem 0;
    vertical-align: middle;
}

.lesson-description {
    font-size: 1.2rem;
    color: #b0b0b0;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.lesson-progress {
    margin-top: 1.5rem;
}

.progress-bar {
    background: rgba(255, 255, 255, 0.1);
    height: 4px;
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    background: linear-gradient(90deg, #00d4ff, #7c3aed);
    height: 100%;
    transition: width 0.3s ease;
}

.progress-text {
    color: #b0b0b0;
    font-size: 0.9rem;
}

/* Lesson Content */
.lesson-content {
    line-height: 1.8;
    font-size: 1.1rem;
    color: #e0e0e0;
    margin-bottom: 3rem;
}

.lesson-content h2, .lesson-content h3, .lesson-content h4 {
    color: #00d4ff;
    margin: 2rem 0 1rem;
}

.lesson-content p {
    margin-bottom: 1.5rem;
}

.lesson-content ul, .lesson-content ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

.lesson-content li {
    margin-bottom: 0.5rem;
}

.lesson-content code {
    background: rgba(0, 212, 255, 0.1);
    color: #00d4ff;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
}

.lesson-content pre {
    background: rgba(0, 0, 0, 0.5);
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1.5rem 0;
    border-left: 4px solid #00d4ff;
}

.lesson-content blockquote {
    border-left: 4px solid #7c3aed;
    padding: 1rem 1.5rem;
    background: rgba(124, 58, 237, 0.1);
    margin: 1.5rem 0;
    font-style: italic;
}

/* Lesson Footer */
.lesson-footer {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
}

.lesson-completion {
    text-align: center;
    margin-bottom: 2rem;
}

.mark-complete-btn {
    background: linear-gradient(135deg, #22c55e, #16a34a);
    color: white;
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.mark-complete-btn:hover {
    transform: translateY(-2px);
}

.mark-complete-btn.completed {
    background: rgba(34, 197, 94, 0.3);
    color: #22c55e;
}

.lesson-navigation-footer {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
}

.footer-nav {
    flex: 1;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    text-decoration: none;
    transition: background 0.2s ease;
}

.footer-nav:hover {
    background: rgba(0, 212, 255, 0.1);
}

.footer-nav.next {
    text-align: right;
}

.nav-label {
    display: block;
    font-size: 0.8rem;
    color: #b0b0b0;
    margin-bottom: 0.3rem;
}

.nav-title {
    display: block;
    color: #e0e0e0;
    font-weight: bold;
}

/* Progress Sidebar - Removed fixed positioning */
.progress-sidebar {
    display: none;
}

.progress-sidebar h4 {
    color: #00d4ff;
    margin-bottom: 1rem;
    font-size: 1rem;
}

.quick-navigation {
    margin-top: 1.5rem;
}

.quick-navigation a {
    display: block;
    color: #b0b0b0;
    text-decoration: none;
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.quick-navigation a:hover {
    color: #00d4ff;
}

/* Module Overview Pages */
.module-overview {
    background: var(--bg-primary);
    min-height: 100vh;
    padding: 100px 0 50px 0;
}

.module-overview .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.module-overview .module-header {
    text-align: center;
    margin-bottom: 3rem;
}

.module-meta {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.module-badge {
    color: white;
    padding: 0.375rem 0.875rem;
    border-radius: 16px;
    font-size: 0.75rem;
    font-weight: 600;
}

.module-overview .lesson-count {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
    padding: 0.375rem 0.875rem;
    border-radius: 16px;
    font-size: 0.75rem;
}

.module-title {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-weight: 700;
    text-align: left;
}

.module-overview .module-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    text-align: center;
}

.module-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.start-module-btn, .back-to-hub-btn {
    padding: 0.625rem 1.25rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    transition: all 0.2s ease;
}

.start-module-btn {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-purple));
    color: white;
}

.back-to-hub-btn {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.start-module-btn:hover {
    transform: translateY(-2px);
}

.back-to-hub-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.module-lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.lesson-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.25rem;
    transition: all 0.2s ease;
}

.lesson-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 24px rgba(0, 180, 216, 0.15);
    border-color: var(--accent-primary);
}

.lesson-card .lesson-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.lesson-card .lesson-number {
    background: var(--accent-purple);
    color: white;
    padding: 0.5rem;
    border-radius: 50%;
    font-weight: bold;
    min-width: 2.5rem;
    text-align: center;
}

.lesson-card h3 {
    margin-bottom: 1rem;
}

.lesson-card h3 a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.4;
}

.lesson-card h3 a:hover {
    color: var(--accent-primary);
}

.lesson-card .lesson-footer {
    margin-top: auto;
}

.lesson-link {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
}

.lesson-link:hover {
    color: var(--accent-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .blog-hero h1 {
        font-size: 2rem;
    }
    
    .course-stats {
        gap: 1.5rem;
    }
    
    .modules-grid {
        padding: 0 1rem;
    }
    
    .lesson-container {
        padding: 1rem;
    }
    
    .lesson-nav {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .lesson-meta {
        justify-content: center;
        text-align: center;
    }
    
    .lesson-title {
        font-size: 2rem;
    }
    
    .lesson-navigation-footer {
        flex-direction: column;
    }
    
    .progress-sidebar {
        display: none;
    }
    
    .features-grid {
        padding: 0 1rem;
    }
}