/* ===== CSS RESET ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ===== CSS VARIABLES ===== */
:root {
    /* Colors */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-900: #1e3a8a;
    
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    --success-500: #10b981;
    --warning-500: #f59e0b;
    --error-500: #ef4444;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Monaco', 'Cascadia Code', monospace;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* =========== enhanced-highlighting.css can be defined here =========== */
code {
    border-radius: 10px;
    font-size: 1.05rem;
    line-height: 1.5rem;
}

/* for line numbers */
code table, code tr, code td, code th {
    margin: 0 !important;
    padding: 0 !important;
    border: 0 !important;
}
/* for block of numbers */
.hljs-ln-numbers {
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;

    text-align: center;
    color: #666;
    border-right: 1px solid #CCC;
    vertical-align: top;
    padding-right: 5px;

    /* your custom style here */
}
/* for block of code */
.hljs-ln-code {
    padding-left: 10px !important;
}


/* ===== BASE STYLES ===== */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--gray-50);
}

/* ===== UTILITY CLASSES ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--primary-600);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-700);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: white;
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

.btn-secondary:hover {
    background-color: var(--gray-50);
    border-color: var(--gray-400);
    transform: translateY(-1px);
}

/* Button Loading States */
.btn.loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
    cursor: not-allowed;
}

.btn.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    margin: -8px 0 0 -8px;
    width: 16px;
    height: 16px;
    border: 2px solid;
    border-color: currentColor transparent currentColor transparent;
    border-radius: 50%;
    animation: button-loading-spin 1s linear infinite;
}

.btn-primary.loading::after {
    border-color: white transparent white transparent;
}

.btn-secondary.loading::after {
    border-color: var(--gray-700) transparent var(--gray-700) transparent;
}

.btn-link.loading::after {
    border-color: var(--primary-600) transparent var(--primary-600) transparent;
}

@keyframes button-loading-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-sm);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: var(--space-2xl);
}

/* ===== HEADER ===== */
.header {
    background-color: white;
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(8px);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-md);
    position: relative;
    z-index: 1001;
}

.nav-brand {
    display: flex;
    align-items: center;
}

.brand-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
    color: var(--gray-900);
}

.brand-logo {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.brand-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-link {
    color: var(--gray-600);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
    padding: var(--space-sm) 0;
    position: relative;
}

.nav-link:hover {
    color: var(--primary-600);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-600);
    transition: width var(--transition-fast);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-search {
    display: flex;
    align-items: center;
}

.search-form {
    display: flex;
    align-items: center;
    position: relative;
}

.search-input {
    width: 300px;
    padding: var(--space-sm) var(--space-md);
    padding-right: 2.5rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.search-btn {
    position: absolute;
    right: var(--space-sm);
    background: none;
    border: none;
    color: var(--gray-400);
    cursor: pointer;
    padding: var(--space-xs);
}

.search-btn:hover {
    color: var(--primary-600);
}

.nav-mobile {
    display: none;
}

/* ===== HERO SECTION ===== */
.hero {
    background: linear-gradient(135deg, var(--primary-50) 0%, white 100%);
    padding: var(--space-3xl) 0;
    border-bottom: 1px solid var(--gray-200);
    position: relative;
    z-index: 1;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--space-2xl);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: var(--space-lg);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--gray-600);
    margin-bottom: var(--space-2xl);
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-3xl);
    margin-top: var(--space-2xl);
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-600);
    display: block;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-600);
    font-weight: 500;
}

/* ===== SECTIONS ===== */
.featured,
.posts,
.tags-section {
    padding: var(--space-3xl) 0;
}

.posts-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

/* ===== CARDS ===== */
.featured-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

.featured-card,
.post-card {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all var(--transition-normal);
    border: 1px solid var(--gray-200);
}

.featured-card:hover,
.post-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-200);
}

.card-image {
    aspect-ratio: 16/9;
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.card-image:hover img {
    transform: scale(1.05);
}

.card-content {
    padding: var(--space-xl);
}

.card-tags {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    flex-wrap: wrap;
}

.tag {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    background-color: var(--primary-50);
    color: var(--primary-700);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.tag:hover {
    background-color: var(--primary-100);
    color: var(--primary-800);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    line-height: 1.4;
}

.card-title a {
    color: var(--gray-900);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.card-title a:hover {
    color: var(--primary-600);
}

.card-description {
    color: var(--gray-600);
    margin-bottom: var(--space-lg);
    line-height: 1.6;
}

.card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-md);
    font-size: 0.875rem;
    color: var(--gray-500);
}

.card-date,
.card-likes {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.card-link {
    display: inline-flex;
    align-items: center;
    color: var(--primary-600);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.card-link:hover {
    color: var(--primary-700);
    gap: var(--space-sm);
}

.card-link::after {
    content: '→';
    margin-left: var(--space-xs);
    transition: margin-left var(--transition-fast);
}

.card-link:hover::after {
    margin-left: var(--space-sm);
}

/* ===== TAGS SECTION ===== */
.tags-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
}

.tag-card {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    text-decoration: none;
    color: var(--gray-900);
    transition: all var(--transition-fast);
    text-align: center;
}

.tag-card:hover {
    border-color: var(--primary-300);
    background-color: var(--primary-50);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.tag-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.tag-count {
    font-size: 0.875rem;
    color: var(--gray-600);
}

/* ===== PAGINATION ===== */
.pagination {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-top: var(--space-2xl);
}

.pagination-btn {
    padding: var(--space-sm) var(--space-md);
    background: white;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.pagination-btn:hover {
    background-color: var(--gray-50);
    border-color: var(--gray-400);
}

.pagination-btn.active {
    background-color: var(--primary-600);
    border-color: var(--primary-600);
    color: white;
}

/* ===== EMPTY STATE ===== */
.empty-state {
    text-align: center;
    padding: var(--space-3xl);
    color: var(--gray-600);
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: var(--space-md);
    color: var(--gray-700);
}

/* ===== FOOTER ===== */
.footer {
    background-color: var(--gray-900);
    color: var(--gray-300);
    padding: var(--space-3xl) 0 var(--space-xl);
    margin-top: var(--space-3xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

.footer-section h3,
.footer-section h4 {
    color: white;
    margin-bottom: var(--space-md);
}

.footer-section p {
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--space-sm);
}

.footer-section a {
    color: var(--gray-300);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-section a:hover {
    color: var(--primary-400);
}

.social-links {
    display: flex;
    gap: var(--space-md);
}

.social-link {
    padding: var(--space-sm);
    background-color: var(--gray-800);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.social-link:hover {
    background-color: var(--primary-600);
    color: white;
}

.footer-bottom {
    border-top: 1px solid var(--gray-800);
    padding-top: var(--space-lg);
    text-align: center;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-stats {
        gap: var(--space-xl);
    }
    
    .nav-menu,
    .search-form {
        display: none;
    }
    
    .nav-mobile {
        display: block;
    }
    
    .mobile-menu-btn {
        background: none;
        border: none;
        cursor: pointer;
        padding: var(--space-sm);
        display: flex;
        flex-direction: column;
        gap: 3px;
    }
    
    .mobile-menu-btn span {
        width: 20px;
        height: 2px;
        background-color: var(--gray-700);
        transition: all var(--transition-fast);
    }
    
    .posts-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-sm);
    }
    
    .hero {
        padding: var(--space-2xl) 0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .card-content {
        padding: var(--space-lg);
    }
}

/* ===== NEW LESSON LAYOUT STYLES ===== */

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

/* Compact Header Layout */
.lessons-header-compact {
    margin-bottom: var(--space-xl);
}

.lessons-header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

.lessons-title-section {
    display: flex;
    align-items: baseline;
    gap: var(--space-md);
    flex: 1;
    min-width: 300px;
}

.lessons-title-section .section-title {
    color: var(--text-primary);
    margin: 0;
    font-size: 2rem;
    line-height: 1.2;
}

.lessons-title-section .section-subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    margin: 0;
    line-height: 1.4;
    opacity: 0.8;
}

/* Compact Pagination */
.lessons-pagination-compact {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-shrink: 0;
}

.pagination-info {
    font-size: 0.875rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

.pagination-controls {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.pagination-btn-compact {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.2s ease;
}

.pagination-btn-compact:hover:not(.disabled) {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
    transform: translateY(-1px);
}

.pagination-btn-compact.disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.pagination-numbers-compact {
    display: flex;
    align-items: center;
    gap: 2px;
}

.pagination-number {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    height: 32px;
    padding: 0 var(--space-xs);
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.pagination-number:hover,
.pagination-number.active {
    background: var(--accent-primary) !important;
    color: #2563eb !important;
    border-color: var(--accent-primary) !important;
}

.pagination-number.active {
    font-weight: 600 !important;
}

/* Lessons Grid - 1 column */
.lessons-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    margin-bottom: var(--space-3xl);
}

/* Lesson Card */
.lesson-card {
    display: flex;
    gap: var(--space-lg);
    padding: var(--space-xl);
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.lesson-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--gray-200);
    transition: background 0.3s ease;
}

.lesson-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-200);
}

.lesson-card:hover::before {
    background: var(--primary-500);
}

/* Lesson Number */
.lesson-number {
    flex-shrink: 0;
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-50);
    border-radius: var(--radius-xl);
    border: 2px solid var(--primary-200);
}

.lesson-num {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-700);
}

.lesson-card:hover .lesson-number {
    background: var(--primary-100);
    border-color: var(--primary-500);
}

/* Lesson Content */
.lesson-content {
    flex: 1;
    min-width: 0;
}

.lesson-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.lesson-tag {
    padding: var(--space-xs) var(--space-sm);
    background: var(--gray-100);
    color: var(--gray-600);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
}

.lesson-title {
    margin-bottom: var(--space-md);
}

.lesson-title a {
    text-decoration: none;
    color: var(--gray-900);
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.4;
    transition: color 0.2s ease;
}

.lesson-title a:hover {
    color: var(--primary-600);
}

.lesson-description {
    color: var(--gray-600);
    line-height: 1.6;
    margin-bottom: var(--space-lg);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    line-clamp: 2;
    overflow: hidden;
}

.lesson-meta {
    color: var(--gray-500);
    font-size: 0.875rem;
    margin-bottom: var(--space-lg);
}

.lesson-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--primary-600);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    transition: all 0.2s ease;
}

.lesson-link:hover {
    color: var(--primary-700);
    gap: var(--space-sm);
}

.lesson-link svg {
    transition: transform 0.2s ease;
}

.lesson-link:hover svg {
    transform: translateX(2px);
}

/* Enhanced Pagination */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    margin-top: var(--space-3xl);
}

.pagination-top {
    margin-top: 0;
    margin-bottom: var(--space-3xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--gray-200);
}

.pagination-numbers {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.pagination-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    background: white;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s ease;
    min-width: 40px;
    justify-content: center;
}

.pagination-btn:hover {
    background: var(--gray-50);
    border-color: var(--gray-400);
}

.pagination-btn.active {
    background: var(--primary-500);
    border-color: var(--primary-500);
    color: white;
}

.pagination-ellipsis {
    padding: var(--space-sm);
    color: var(--gray-400);
}

/* Enhanced Empty State */
.empty-state {
    text-align: center;
    padding: var(--space-3xl);
}

.empty-icon {
    margin-bottom: var(--space-lg);
    color: var(--gray-300);
}

.empty-state h3 {
    color: var(--gray-700);
    margin-bottom: var(--space-md);
}

.empty-state p {
    color: var(--gray-500);
}

/* Responsive Design for New Layout */
@media (max-width: 1024px) {
    .lessons-grid {
        gap: var(--space-lg);
    }
    
    .lesson-card {
        padding: var(--space-lg);
    }
}

@media (max-width: 768px) {
    .lessons {
        padding: var(--space-xl) 0;
    }
    
    .lessons-header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-md);
    }
    
    .lessons-title-section {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-xs);
        min-width: unset;
        width: 100%;
    }
    
    .lessons-title-section .section-title {
        font-size: 1.75rem;
    }
    
    .lessons-title-section .section-subtitle {
        font-size: 0.95rem;
    }
    
    .lessons-pagination-compact {
        align-self: flex-end;
        gap: var(--space-sm);
    }
    
    .lesson-card {
        flex-direction: column;
        text-align: center;
        padding: var(--space-lg);
    }
    
    .lesson-number {
        align-self: center;
        width: 56px;
        height: 56px;
    }
    
    .lesson-num {
        font-size: 1.125rem;
    }
    
    .lesson-title a {
        font-size: 1.125rem;
    }
    
    .pagination {
        flex-wrap: wrap;
        gap: var(--space-xs);
    }
    
    .pagination-btn {
        padding: var(--space-xs) var(--space-sm);
        min-width: 36px;
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    .lessons-pagination-compact {
        align-self: center;
        width: 100%;
        justify-content: center;
    }
    
    .pagination-info {
        font-size: 0.8rem;
    }
    
    .pagination-btn-compact,
    .pagination-number {
        width: 28px;
        height: 28px;
        min-width: 28px;
    }
    
    .pagination-btn-compact svg {
        width: 12px;
        height: 12px;
    }
    
    .lesson-card {
        padding: var(--space-md);
    }
    
    .lesson-number {
        width: 48px;
        height: 48px;
    }
    
    .lesson-num {
        font-size: 1rem;
    }
}

/* ===== AUTHENTICATION STYLES ===== */

/* Navigation Authentication */
.nav-auth {
    display: flex;
    align-items: center;
    position: relative;
}

/* User Dropdown */
.user-dropdown {
    position: relative;
    z-index: 1002;
}

.user-avatar {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs);
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
}

.user-avatar:hover {
    background: var(--bg-secondary);
}

.user-avatar.active {
    background: var(--bg-secondary);
}

.avatar-circle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: #3b82f6;
    color: #ffffff;
    font-weight: 600;
    font-size: 0.875rem;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.avatar-circle.guest {
    background: var(--gray-300);
    color: var(--gray-600);
}

.avatar-initial {
    display: block;
    line-height: 1;
    font-weight: 600;
    font-size: 0.875rem;
    color: white;
    text-transform: uppercase;
}

.dropdown-arrow {
    color: var(--text-secondary);
    transition: transform 0.2s ease;
}

.user-avatar.active .dropdown-arrow {
    transform: rotate(180deg);
}

/* Dropdown Menu */
.user-dropdown-menu {
    position: absolute;
    top: calc(100% + var(--space-xs));
    right: 0;
    width: 280px;
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 38px -10px rgba(22, 23, 24, 0.35), 0 10px 20px -15px rgba(22, 23, 24, 0.2);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.2s ease;
    z-index: 1003;
    overflow: hidden;
}

.user-dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    background: #FFF;
    border: 1px solid #ccc;
}

.dropdown-header {
    padding: var(--space-md);
    background: #f9fafb;
    border-bottom: 1px solid #e5e7eb;
}

.user-info .user-name {
    font-weight: 600;
    color: #111827 !important;
    font-size: 0.875rem;
    margin-bottom: 2px;
}

.user-info .user-email {
    font-size: 0.75rem;
    color: #6b7280 !important;
    opacity: 1;
}

.guest-message .guest-title {
    font-weight: 600;
    color: #111827 !important;
    font-size: 0.875rem;
    margin-bottom: 2px;
}

.guest-message .guest-subtitle {
    font-size: 0.75rem;
    color: #6b7280 !important;
    opacity: 1;
}

.dropdown-divider {
    height: 1px;
    background: var(--border-primary);
    margin: 0;
}

.dropdown-content {
    padding: var(--space-xs);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    color: #1f2937 !important;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s ease;
    margin-bottom: 2px;
    border: 1px solid transparent;
}

.dropdown-item:last-child {
    margin-bottom: 0;
}

.dropdown-item:hover {
    background: #f3f4f6 !important;
    color: #111827 !important;
    border-color: #e5e7eb;
}

.dropdown-item.primary {
    background: #3b82f6 !important;
    color: #ffffff !important;
    font-weight: 600 !important;
}

.dropdown-item.primary:hover {
    background: #2563eb !important;
    color: #ffffff !important;
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(59, 130, 246, 0.2);
}

.dropdown-item.sign-out {
    color: #dc2626 !important;
}

.dropdown-item.sign-out:hover {
    background: #fef2f2 !important;
    color: #b91c1c !important;
}

.dropdown-item svg {
    flex-shrink: 0;
    opacity: 0.8;
    color: inherit;
}

/* Modal Overlay */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--space-md);
}

/* Modal */
.modal {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    max-width: 400px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-content {
    padding: 0;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg);
    border-bottom: 1px solid var(--gray-200);
}

.modal-header h2 {
    margin: 0;
    color: var(--gray-900);
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--gray-400);
    cursor: pointer;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    color: var(--gray-600);
}

.modal-body {
    padding: var(--space-lg);
}

.modal-actions {
    display: flex;
    gap: var(--space-sm);
    justify-content: flex-end;
    margin-top: var(--space-lg);
}

/* Form Styles */
.form-group {
    margin-bottom: var(--space-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-xs);
    color: var(--gray-700);
    font-weight: 500;
    font-size: 0.875rem;
}

.form-group input {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px var(--primary-50);
}

.form-group input:invalid {
    border-color: var(--error-500);
}

.form-hint {
    display: block;
    margin-top: var(--space-xs);
    color: var(--gray-500);
    font-size: 0.75rem;
}

.error-message {
    color: var(--error-500);
    font-size: 0.75rem;
    margin-top: var(--space-xs);
    display: none;
}

.error-message:not(:empty) {
    display: block;
}

/* Messages */
.message {
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    margin-top: var(--space-sm);
    display: none;
}

.message-success {
    background-color: var(--success-50);
    color: var(--success-800);
    border: 1px solid var(--success-200);
}

.message-error {
    background-color: var(--error-50);
    color: var(--error-800);
    border: 1px solid var(--error-200);
}

.modal-messages {
    margin-top: var(--space-md);
}

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

.forgot-password-link:hover {
    color: var(--primary-600);
    text-decoration: underline;
}

.resend-verification {
    text-align: center;
    margin-top: var(--space-sm);
}

.btn-link {
    background: none;
    border: none;
    color: var(--primary-500);
    text-decoration: underline;
    cursor: pointer;
    font-size: 0.875rem;
    padding: 0;
}

.btn-link:hover {
    color: var(--primary-600);
}

/* Reset Password Page */
.reset-password-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--gray-50);
    padding: var(--space-md);
}

.reset-password-form {
    background: white;
    padding: var(--space-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
}

.reset-password-form .brand {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.reset-password-form .brand-logo {
    width: 48px;
    height: 48px;
    margin-bottom: var(--space-sm);
}

.reset-password-form h1 {
    color: var(--gray-900);
    font-size: 1.5rem;
    margin: 0;
}

.reset-password-form h2 {
    color: var(--gray-900);
    font-size: 1.25rem;
    margin: 0 0 var(--space-sm) 0;
}

.reset-password-form p {
    color: var(--gray-600);
    margin-bottom: var(--space-lg);
}

.btn-full {
    width: 100%;
}

/* Alerts */
.alert {
    padding: var(--space-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--space-lg);
}

.alert-error {
    background-color: var(--error-50);
    color: var(--error-800);
    border: 1px solid var(--error-200);
}

/* Notifications */
.notification {
    position: fixed;
    top: var(--space-lg);
    right: var(--space-lg);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--border-radius);
    color: white;
    font-weight: 500;
    z-index: 1100;
    animation: slideInRight 0.3s ease-out;
}

.notification-success {
    background-color: var(--success-500);
}

.notification-error {
    background-color: var(--error-500);
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Missing CSS Variables */
:root {
    --success-50: #f0fdf4;
    --success-200: #bbf7d0;
    --success-800: #166534;
    
    --error-50: #fef2f2;
    --error-200: #fecaca;
    --error-800: #991b1b;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .modal {
        margin: var(--space-md);
        max-width: none;
    }
    
    .modal-header,
    .modal-body {
        padding: var(--space-md);
    }
    
    .user-dropdown-menu {
        width: 260px;
        right: -10px;
    }
    
    .avatar-circle {
        width: 32px;
        height: 32px;
        font-size: 0.8rem;
    }
    
    .dropdown-header,
    .dropdown-content {
        padding: var(--space-sm);
    }
    
    .dropdown-item {
        padding: var(--space-sm);
        font-size: 0.8rem;
    }
    
    .notification {
        left: var(--space-md);
        right: var(--space-md);
        top: var(--space-md);
    }
}