/* --- 1. Import a Modern Font --- */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;700&display=swap');

/* --- 2. Define a Modern Color Palette & Root Variables --- */
:root {
    --primary-color: #4a90e2; /* A softer, modern blue */
    --secondary-color: #50e3c2; /* A minty green for accents */
    --text-color: #333;
    --text-light: #555;
    --background-color: #f8f9fa; /* Off-white for less harshness */
    --card-background: #ffffff;
    --border-color: #e9ecef;
    --premium-color: #f5a623; /* A vibrant orange for premium tags */
    --free-color: #28a745; /* Bootstrap's success green is fine */
}

/* --- 3. Apply Global Styles --- */
body {
    font-family: 'Noto Sans JP', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 500;
}

/* --- Make the website much wider --- */
.container {
    max-width: 1800px !important; /* Much wider than Bootstrap's default 1140px */
    padding-left: 2rem !important;
    padding-right: 2rem !important;
}

.container-fluid {
    max-width: 2000px !important; /* Ultra-wide for maximum screen usage */
    margin: 0 auto !important;
    padding-left: 2rem !important;
    padding-right: 2rem !important;
}

/* Wider content areas for lesson pages */
.lesson-header-card,
.lesson-content-card,
.lesson-navigation-top,
.lesson-navigation-bottom,
.page-overview {
    max-width: none !important;
}

/* Make the main content area use almost full width */
.col-12 {
    padding-left: 1rem !important;
    padding-right: 1rem !important;
}

/* --- 4. Style Common Elements (Buttons & Badges) --- */
.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    transition: all 0.2s ease-in-out;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.badge.bg-warning {
    background-color: var(--premium-color) !important;
    color: white;
}

/* Homepage Styles */
.welcome-card {
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px); /* Creates the frosted glass effect */
    border-radius: 1rem;
    padding: 3rem;
    max-width: 650px;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.18);
}

.welcome-card h1 {
    font-weight: 700;
    color: var(--text-color);
}

/* Modern Welcome Card Styles */
.modern-welcome-card {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 3rem 2.5rem;
    max-width: 800px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1), 0 8px 25px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.3);
    position: relative;
    overflow: hidden;
}

.modern-welcome-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 24px 24px 0 0;
}

/* Welcome Header */
.welcome-header {
    margin-bottom: 2rem;
}

.welcome-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem auto;
    box-shadow: 0 8px 25px rgba(74, 144, 226, 0.3);
}

.welcome-icon i {
    font-size: 2.5rem;
    color: white;
}

.welcome-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.welcome-subtitle {
    font-size: 1.125rem;
    color: var(--text-light);
    line-height: 1.6;
    max-width: 600px;
    margin: 0 auto;
}

/* Welcome Stats */
.welcome-stats {
    margin: 2.5rem 0;
}

.stats-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    background: rgba(74, 144, 226, 0.05);
    border-radius: 16px;
    padding: 2rem;
    border: 1px solid rgba(74, 144, 226, 0.1);
}

.stat-item {
    text-align: center;
    flex: 1;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
    margin-bottom: 0.5rem;
    display: block;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-light);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(74, 144, 226, 0.2);
    flex-shrink: 0;
}

/* Welcome Actions */
.welcome-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin: 2rem 0;
}

.welcome-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    border: 2px solid transparent;
    min-width: 200px;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.welcome-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.welcome-btn:hover::before {
    left: 100%;
}

.welcome-btn:hover {
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.welcome-btn i {
    font-size: 1.1rem;
}

.welcome-btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #3a7bd5);
    color: white;
    box-shadow: 0 4px 15px rgba(74, 144, 226, 0.3);
}

.welcome-btn-primary:hover {
    color: white;
    box-shadow: 0 8px 25px rgba(74, 144, 226, 0.4);
}

.welcome-btn-secondary {
    background: linear-gradient(135deg, #6c757d, #5a6268);
    color: white;
    box-shadow: 0 4px 15px rgba(108, 117, 125, 0.3);
}

.welcome-btn-secondary:hover {
    color: white;
    box-shadow: 0 8px 25px rgba(108, 117, 125, 0.4);
}

.welcome-btn-success {
    background: linear-gradient(135deg, #28a745, #20c997);
    color: white;
    box-shadow: 0 4px 15px rgba(40, 167, 69, 0.3);
}

.welcome-btn-success:hover {
    color: white;
    box-shadow: 0 8px 25px rgba(40, 167, 69, 0.4);
}

/* Guest Info */
.guest-info {
    margin: 2rem 0;
}

.info-card {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    background: rgba(23, 162, 184, 0.1);
    border: 1px solid rgba(23, 162, 184, 0.2);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: left;
    max-width: 500px;
    margin: 0 auto;
}

.info-card i {
    color: #17a2b8;
    font-size: 1.25rem;
    margin-top: 0.25rem;
    flex-shrink: 0;
}

.info-content strong {
    color: var(--text-color);
    display: block;
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.info-content p {
    color: var(--text-light);
    margin: 0;
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Login Link */
.login-link {
    color: var(--text-light);
    font-size: 0.95rem;
}

.login-link-btn {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    margin-left: 0.5rem;
    transition: color 0.2s ease;
}

.login-link-btn:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

/* Features Preview */
.features-preview {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    padding-top: 2rem;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    margin-top: 2rem;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-light);
    font-size: 0.875rem;
    font-weight: 500;
}

.feature-item i {
    color: var(--primary-color);
    font-size: 1rem;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .modern-welcome-card {
        padding: 1.25rem 0.75rem;
        margin: 0.25rem;
        border-radius: 16px;
        max-width: 98%;
    }
    
    .welcome-header {
        margin-bottom: 1rem;
    }
    
    .welcome-icon {
        width: 50px;
        height: 50px;
        margin-bottom: 0.75rem;
    }
    
    .welcome-icon i {
        font-size: 1.75rem;
    }
    
    .welcome-title {
        font-size: 1.5rem;
        margin-bottom: 0.5rem;
        line-height: 1.2;
    }
    
    .welcome-subtitle {
        font-size: 0.9rem;
        line-height: 1.3;
    }
    
    .welcome-stats {
        margin: 1rem 0;
    }
    
    .stats-container {
        flex-direction: column;
        gap: 0.75rem;
        padding: 0.75rem;
        border-radius: 12px;
    }
    
    .stat-item {
        flex: none;
        min-width: 0;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 0.5rem;
    }
    
    .stat-number {
        font-size: 1.5rem;
        margin-bottom: 0;
        flex-shrink: 0;
    }
    
    .stat-label {
        font-size: 0.8rem;
        line-height: 1.2;
        text-align: left;
    }
    
    .stat-divider {
        display: none;
    }
    
    .welcome-actions {
        margin: 1rem 0;
        gap: 0.5rem;
    }
    
    .welcome-btn {
        padding: 0.625rem 1rem;
        font-size: 0.85rem;
        min-width: 0;
        flex: 1;
        max-width: none;
    }
    
    .login-link {
        margin-top: 0.75rem;
    }
}

@media (max-width: 576px) {
    .modern-welcome-card {
        padding: 1.25rem 0.75rem;
        margin: 0.25rem;
        border-radius: 12px;
    }
    
    .welcome-icon {
        width: 50px;
        height: 50px;
        margin-bottom: 0.75rem;
    }
    
    .welcome-icon i {
        font-size: 1.75rem;
    }
    
    .welcome-title {
        font-size: 1.5rem;
        margin-bottom: 0.5rem;
        line-height: 1.2;
    }
    
    .welcome-subtitle {
        font-size: 0.85rem;
        line-height: 1.3;
    }
    
    .welcome-stats {
        margin: 1.25rem 0;
    }
    
    .stats-container {
        padding: 0.75rem;
        gap: 0.75rem;
    }
    
    .stat-number {
        font-size: 1.25rem;
    }
    
    .stat-label {
        font-size: 0.7rem;
    }
    
    .welcome-actions {
        margin: 1.25rem 0;
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .welcome-btn {
        padding: 0.625rem 1rem;
        font-size: 0.85rem;
        width: 100%;
    }
    
    .info-card {
        padding: 0.875rem;
        flex-direction: column;
        text-align: center;
        gap: 0.75rem;
    }
    
    .info-content strong {
        font-size: 0.85rem;
        margin-bottom: 0.25rem;
    }
    
    .info-content p {
        font-size: 0.75rem;
        line-height: 1.4;
    }
    
    .login-link {
        font-size: 0.85rem;
        margin-top: 1rem;
    }
    
    .features-preview {
        margin-top: 1.25rem;
        padding-top: 1.25rem;
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .feature-item {
        font-size: 0.75rem;
    }
}

/* Ultra-compact for very small screens */
@media (max-width: 400px) {
    .modern-welcome-card {
        padding: 1rem 0.5rem;
        margin: 0.125rem;
    }
    
    .welcome-title {
        font-size: 1.25rem;
    }
    
    .welcome-subtitle {
        font-size: 0.8rem;
    }
    
    .stats-container {
        padding: 0.5rem;
        gap: 0.5rem;
    }
    
    .stat-number {
        font-size: 1.1rem;
    }
    
    .stat-label {
        font-size: 0.65rem;
    }
    
    .welcome-btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.8rem;
    }
    
    .info-card {
        padding: 0.75rem;
    }
    
    .info-content strong {
        font-size: 0.8rem;
    }
    
    .info-content p {
        font-size: 0.7rem;
    }
}

/* Lesson Card Styles */
.lesson-card {
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.lesson-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0,0,0,0.1);
}

.lesson-card.locked {
    opacity: 0.8;
}

.lesson-card .progress-bar {
    background-color: var(--secondary-color);
}

/* Individual Lesson Page Styles */
.lesson-header-card {
    background-color: var(--card-background);
    border-radius: 12px;
    border: none;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.content-item {
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary-color); /* Adds a nice accent */
    border-radius: 8px;
    padding: 1.5rem !important;
    transition: box-shadow 0.2s ease;
}

.content-item:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.content-item .mark-complete-btn {
    border-radius: 20px; /* Pill-shaped button */
}

/* Make the main lesson card distinct */
.lesson-content-card {
    background-color: transparent;
    border: none;
}

/* Filter card styling */
.filter-card {
    background-color: var(--card-background);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

/* Enhanced Navigation Bar */
.enhanced-navbar {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    padding: 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    position: relative;
    z-index: 1000;
}

.enhanced-navbar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="navgrain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="0.5" fill="white" opacity="0.05"/><circle cx="75" cy="75" r="0.5" fill="white" opacity="0.05"/><circle cx="50" cy="10" r="0.3" fill="white" opacity="0.05"/></pattern></defs><rect width="100" height="100" fill="url(%23navgrain)"/></svg>');
    pointer-events: none;
}

.navbar-container {
    max-width: 1800px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 70px;
    position: relative;
    z-index: 10;
}

/* Brand Section */
.navbar-brand-section {
    display: flex;
    align-items: center;
}

.enhanced-navbar-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
    text-decoration: none;
    color: white;
    transition: all 0.3s ease;
}

.enhanced-navbar-brand:hover {
    color: white;
    text-decoration: none;
    transform: translateY(-1px);
}

.brand-icon {
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-name {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 0.25rem;
}

.brand-tagline {
    font-size: 0.75rem;
    opacity: 0.9;
    font-weight: 300;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
    gap: 0.25rem;
}

.hamburger-line {
    width: 25px;
    height: 2px;
    background: white;
    transition: all 0.3s ease;
    border-radius: 1px;
}

.mobile-menu-toggle:hover .hamburger-line {
    background: rgba(255, 255, 255, 0.8);
}

/* Navigation Content */
.navbar-content-wrapper {
    display: flex;
    align-items: center;
    gap: 2rem;
    flex: 1;
    justify-content: space-between;
    margin-left: 2rem;
}

/* Mobile Navigation Menu */
.mobile-nav-menu {
    display: none;
}

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

.nav-links {
    display: flex;
    gap: 1rem;
}

.enhanced-nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    color: white;
    text-decoration: none;
    border-radius: 12px;
    font-weight: 500;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.enhanced-nav-link:hover {
    color: white;
    text-decoration: none;
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.enhanced-nav-link i {
    font-size: 0.9rem;
}

/* User Section */
.navbar-user-section {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.user-avatar {
    width: 35px;
    height: 35px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.9rem;
}

.user-details {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
}

.user-name {
    color: white;
    font-weight: 600;
    font-size: 0.9rem;
    line-height: 1;
}

.user-subscription {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.75rem;
    opacity: 0.9;
    font-weight: 500;
}

.user-subscription.premium {
    color: #ffd700;
}

.user-subscription.free {
    color: rgba(255, 255, 255, 0.8);
}

/* Action Buttons */
.nav-actions {
    display: flex;
    gap: 0.75rem;
}

.nav-action-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.nav-action-btn:hover {
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.admin-btn {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border-color: rgba(255, 255, 255, 0.2);
}

.admin-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    color: white;
}

.upgrade-btn {
    background: #28a745;
    color: white;
    border-color: #28a745;
}

.upgrade-btn:hover {
    background: #218838;
    color: white;
}

.downgrade-btn {
    background: #ffc107;
    color: #212529;
    border-color: #ffc107;
}

.downgrade-btn:hover {
    background: #e0a800;
    color: #212529;
}

.login-btn {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border-color: rgba(255, 255, 255, 0.2);
}

.login-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    color: white;
}

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

.register-btn:hover {
    background: rgba(255, 255, 255, 0.9);
    color: var(--primary-color);
}

.logout-btn {
    background: rgba(220, 53, 69, 0.8);
    color: white;
    border-color: rgba(220, 53, 69, 0.8);
}

.logout-btn:hover {
    background: #dc3545;
    color: white;
}

/* Responsive Design for Navigation */
@media (max-width: 992px) {
    .mobile-menu-toggle {
        display: flex;
    }
    
    .navbar-collapse {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
        padding: 1.5rem 2rem;
        margin-left: 0;
        flex-direction: column;
        gap: 1.5rem;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    }
    
    .navbar-nav-section,
    .navbar-user-section {
        width: 100%;
        justify-content: center;
    }
    
    .nav-links {
        flex-direction: column;
        width: 100%;
        gap: 0.75rem;
    }
    
    .enhanced-nav-link {
        justify-content: center;
        width: 100%;
    }
    
    .nav-actions {
        flex-wrap: wrap;
        justify-content: center;
        width: 100%;
    }
    
    .user-info {
        justify-content: center;
        width: 100%;
    }
}

@media (max-width: 768px) {
    .navbar-container {
        padding: 0 1rem;
        min-height: 60px;
    }
    
    .brand-text {
        display: none;
    }
    
    .brand-icon {
        width: 40px;
        height: 40px;
        font-size: 1.25rem;
    }
    
    .nav-actions {
        gap: 0.5rem;
    }
    
    .nav-action-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
    
    .nav-action-btn span {
        display: none;
    }
}

@media (max-width: 576px) {
    .user-details {
        display: none;
    }
    
    .user-info {
        padding: 0.5rem;
        width: auto;
    }
}

/* Form improvements */
.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(74, 144, 226, 0.25);
}

.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(74, 144, 226, 0.25);
}

/* Alert improvements */
.alert {
    border-radius: 8px;
    border: none;
}

/* Progress bar improvements */
.progress {
    border-radius: 10px;
    background-color: #e9ecef;
}

.progress-bar {
    border-radius: 10px;
}

/* Badge improvements */
.badge {
    font-weight: 500;
    padding: 0.5em 0.75em;
}

/* Card improvements */
.card {
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.card-header {
    background-color: var(--background-color);
    border-bottom: 1px solid var(--border-color);
    border-radius: 12px 12px 0 0 !important;
}

/* Button improvements */
.btn {
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.2s ease-in-out;
}

.btn:hover {
    transform: translateY(-1px);
}

/* Text improvements */
.text-muted {
    color: var(--text-light) !important;
}

/* Interactive content styling */
.quiz-question {
    background-color: var(--background-color);
    border-radius: 8px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}

.quiz-question .question-header h5 {
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.form-check-input:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

/* Content type specific styling */
.text-content-container {
    background-color: var(--background-color);
    border-radius: 8px;
    padding: 1.5rem;
}

.content-title {
    color: var(--primary-color);
    font-weight: 600;
}

/* Media content styling */
.ratio iframe {
    border-radius: 8px;
}

audio {
    border-radius: 8px;
}

/* Admin Modal Improvements */
#pageEditorModal .modal-content {
    max-width: 1400px !important;
    width: 95% !important;
}

#lessonContentModal .modal-content {
    max-width: 1200px !important;
    width: 90% !important;
}

#addContentModal .modal-content {
    max-width: 900px !important;
    width: 85% !important;
}

/* Modal Header Improvements */
.modal-header h4 {
    font-size: 1.5rem !important;
    font-weight: 600 !important;
    margin: 0 !important;
    color: var(--text-color) !important;
}

.modal-header {
    padding: 1.5rem 2rem !important;
    border-bottom: 2px solid var(--border-color) !important;
}

/* Page Editor Modal Specific Improvements */
#pageEditorModal .modal-body {
    padding: 2rem !important;
}

#pageEditorModal h5 {
    font-size: 1.25rem !important;
    font-weight: 600 !important;
    color: var(--primary-color) !important;
    margin-bottom: 1.5rem !important;
}

/* Reorder Button Improvements - FORCE BLACK WITH HOVER EFFECTS */
button.reorder-btn,
.btn.reorder-btn,
#pageEditorModal .reorder-btn,
#pageEditorModal button.reorder-btn,
#pageEditorModal .btn.reorder-btn {
    min-width: 40px !important;
    height: 35px !important;
    border: 2px solid #000000 !important;
    background-color: #000000 !important;
    background: #000000 !important;
    color: #ffffff !important;
    font-size: 14px !important;
    font-weight: bold !important;
    border-radius: 6px !important;
    transition: all 0.3s ease-in-out !important;
    margin: 2px 0 !important;
    cursor: pointer !important;
}

button.reorder-btn:hover,
.btn.reorder-btn:hover,
#pageEditorModal .reorder-btn:hover,
#pageEditorModal button.reorder-btn:hover,
#pageEditorModal .btn.reorder-btn:hover {
    background-color: #4a90e2 !important;
    background: #4a90e2 !important;
    border-color: #4a90e2 !important;
    color: #ffffff !important;
    transform: scale(1.1) translateY(-2px) !important;
    box-shadow: 0 4px 12px rgba(74, 144, 226, 0.4) !important;
}

button.reorder-btn:active,
.btn.reorder-btn:active,
#pageEditorModal .reorder-btn:active,
#pageEditorModal button.reorder-btn:active,
#pageEditorModal .btn.reorder-btn:active {
    transform: scale(1.05) translateY(0px) !important;
    box-shadow: 0 2px 6px rgba(74, 144, 226, 0.3) !important;
}

button.reorder-btn:disabled,
.btn.reorder-btn:disabled,
#pageEditorModal .reorder-btn:disabled,
#pageEditorModal button.reorder-btn:disabled,
#pageEditorModal .btn.reorder-btn:disabled {
    background-color: #f8f9fa !important;
    background: #f8f9fa !important;
    border-color: #e9ecef !important;
    color: #6c757d !important;
    cursor: not-allowed !important;
    transform: none !important;
    box-shadow: none !important;
    opacity: 0.6 !important;
}

/* Additional force for any button with onclick containing moveContentInPage */
button[onclick*="moveContentInPage"] {
    background-color: #000000 !important;
    background: #000000 !important;
    border: 2px solid #000000 !important;
    color: #ffffff !important;
    transition: all 0.3s ease-in-out !important;
}

button[onclick*="moveContentInPage"]:hover {
    background-color: #4a90e2 !important;
    background: #4a90e2 !important;
    border-color: #4a90e2 !important;
    color: #ffffff !important;
    transform: scale(1.1) translateY(-2px) !important;
    box-shadow: 0 4px 12px rgba(74, 144, 226, 0.4) !important;
}

button[onclick*="moveContentInPage"]:active {
    transform: scale(1.05) translateY(0px) !important;
    box-shadow: 0 2px 6px rgba(74, 144, 226, 0.3) !important;
}

.order-number {
    font-weight: 600 !important;
    font-size: 16px !important;
    color: var(--text-color) !important;
    padding: 4px 0 !important;
}

/* Action Buttons Improvements */
.btn-sm {
    padding: 0.4rem 0.8rem !important;
    font-size: 0.85rem !important;
    margin-right: 0.25rem !important;
    border-radius: 5px !important;
}

.btn-sm:last-child {
    margin-right: 0 !important;
}

/* Table Improvements for Page Editor */
#pageEditorModal table th {
    background-color: var(--background-color) !important;
    font-weight: 600 !important;
    font-size: 0.9rem !important;
    text-transform: uppercase !important;
    letter-spacing: 0.5px !important;
    padding: 1rem !important;
    border-bottom: 2px solid var(--border-color) !important;
}

#pageEditorModal table td {
    padding: 1rem !important;
    vertical-align: middle !important;
}

#pageEditorModal table tbody tr:hover {
    background-color: #f8f9fa !important;
}

/* Column Width Adjustments for Page Editor */
#pageEditorModal table th:nth-child(1), /* ORDER */
#pageEditorModal table td:nth-child(1) {
    width: 80px !important;
    min-width: 80px !important;
}

#pageEditorModal table th:nth-child(2), /* TYPE */
#pageEditorModal table td:nth-child(2) {
    width: 120px !important;
    min-width: 120px !important;
}

#pageEditorModal table th:nth-child(3), /* TITLE */
#pageEditorModal table td:nth-child(3) {
    width: auto !important;
    min-width: 200px !important;
}

#pageEditorModal table th:nth-child(4), /* OPTIONAL */
#pageEditorModal table td:nth-child(4) {
    width: 100px !important;
    min-width: 100px !important;
}

#pageEditorModal table th:nth-child(5), /* ACTIONS */
#pageEditorModal table td:nth-child(5) {
    width: 280px !important;
    min-width: 280px !important;
}

/* Action Buttons Container */
#pageEditorModal table td:nth-child(5) {
    white-space: nowrap !important;
}

#pageEditorModal table td:nth-child(5) .btn {
    display: inline-block !important;
    margin-right: 0.5rem !important;
}

#pageEditorModal table td:nth-child(5) .btn:last-child {
    margin-right: 0 !important;
}

/* Content Title Styling */
.content-title {
    font-weight: 600 !important;
    font-size: 1rem !important;
    color: var(--text-color) !important;
    margin-bottom: 0.25rem !important;
}

/* Badge Improvements */
.badge {
    font-size: 0.75rem !important;
    padding: 0.4rem 0.8rem !important;
    border-radius: 12px !important;
    font-weight: 600 !important;
}

/* --- 3D Flip Card Styles --- */

/* 1. The Scene: Establishes the 3D space and perspective. */
.card-scene {
    width: 100%;
    height: 200px;
    perspective: 1000px; /* Defines the "distance" for the 3D effect. */
    background-color: transparent;
    border: none;
    padding: 0;
    cursor: pointer;
    margin-bottom: 1rem;
}

/* 2. The Flipper: The 3D object that rotates. */
.card-flipper {
    width: 100%;
    height: 100%;
    position: relative;
    transition: transform 0.8s; /* Smooth animation for the flip. */
    transform-style: preserve-3d; /* Crucial for making children exist in 3D space. */
}

/* 3. The Flipped State: Apply this class with JS to flip the card. */
.card-flipper.is-flipped {
    transform: rotateY(180deg);
}

/* 4. The Faces: Common styles for both front and back. */
.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden; /* Safari */
    backface-visibility: hidden; /* Hides the face when it's turned away. */
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-color);
    transition: box-shadow 0.3s ease;
}

/* 5. The Front Face: Specific styling. */
.card-face--front {
    background-color: var(--card-background);
    border-left: 4px solid var(--primary-color);
}

/* 6. The Back Face: Specific styling and initial rotation. */
.card-face--back {
    background-color: var(--background-color);
    transform: rotateY(180deg); /* Pre-rotates the back face. */
    border-left: 4px solid var(--secondary-color);
}

/* Hover effects for flip cards */
.card-scene:hover .card-face {
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

/* Focus styles for accessibility */
.card-scene:focus {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

/* Style for the large Japanese character on the front. */
.flip-card .kana-char {
    font-size: 80px; /* Large, clear character */
    color: var(--primary-color);
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 500;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Style for the details on the back. */
.flip-card .details {
    text-align: center;
    padding: 20px;
    color: var(--text-color);
    font-size: 16px;
    width: 100%;
}

.flip-card .details p {
    margin: 0 0 8px 0;
    font-weight: 500;
}

.flip-card .details strong {
    color: var(--primary-color);
}

/* Vocabulary specific styling */
.flip-card .vocab-front {
    flex-direction: column;
    text-align: center;
}

.flip-card .vocab-word {
    font-size: 48px;
    color: var(--primary-color);
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 500;
    margin-bottom: 8px;
}

.flip-card .vocab-reading {
    font-size: 20px;
    color: var(--text-light);
    font-family: 'Noto Sans JP', sans-serif;
}

/* Grammar specific styling */
.flip-card .grammar-front {
    flex-direction: column;
    text-align: center;
    padding: 20px;
}

.flip-card .grammar-title {
    font-size: 24px;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 10px;
}

.flip-card .grammar-structure {
    font-size: 18px;
    color: var(--text-color);
    font-family: 'Courier New', monospace;
    background-color: rgba(74, 144, 226, 0.1);
    padding: 8px 12px;
    border-radius: 6px;
}

/* Flip instruction hint */
.flip-hint {
    position: absolute;
    bottom: 10px;
    right: 15px;
    font-size: 12px;
    color: var(--text-light);
    opacity: 0.7;
    pointer-events: none;
}

/* Animation for flip hint */
.card-scene:hover .flip-hint {
    opacity: 1;
}

/* Page Title Styling - Make lesson page titles smaller and more readable */
.page-title {
    font-size: 1.25rem !important; /* Smaller than default h4 */
    font-weight: 600 !important;
    color: var(--primary-color) !important;
    line-height: 1.4 !important;
    margin-bottom: 1rem !important;
    max-width: 1600px !important; /* Ultra-wide for maximum screen usage */
    margin-left: auto !important;
    margin-right: auto !important;
}

/* Make page descriptions smaller too */
.page-description {
    font-size: 0.95rem !important;
    line-height: 1.5 !important;
    max-width: 1500px !important; /* Ultra-wide for maximum screen usage */
    margin-left: auto !important;
    margin-right: auto !important;
}

/* Desktop content title improvements - make content headings smaller */
.content-item h1,
.content-item h2,
.content-item h3,
.content-item h4 {
    font-size: 1.3rem !important;
    line-height: 1.4 !important;
    margin-bottom: 1rem !important;
    font-weight: 600 !important;
}

/* Target rich text content headings on desktop */
.rich-text-content h1,
.rich-text-content h2,
.rich-text-content h3,
.rich-text-content h4 {
    font-size: 1.3rem !important;
    line-height: 1.4 !important;
    margin-bottom: 1rem !important;
    font-weight: 600 !important;
}

/* Target text content container headings on desktop */
.text-content-container h1,
.text-content-container h2,
.text-content-container h3,
.text-content-container h4 {
    font-size: 1.3rem !important;
    line-height: 1.4 !important;
    margin-bottom: 1rem !important;
    font-weight: 600 !important;
}

/* Target any remaining large headings in content on desktop */
.content-body h1,
.content-body h2,
.content-body h3,
.content-body h4 {
    font-size: 1.3rem !important;
    line-height: 1.4 !important;
    margin-bottom: 1rem !important;
    font-weight: 600 !important;
}

/* Content areas should use more width */
.text-content-container {
    background-color: var(--background-color);
    border-radius: 8px;
    padding: 1.5rem;
    max-width: none !important; /* Remove width constraints */
}

/* Rich text content should be wider */
.rich-text-content {
    max-width: none !important;
    font-size: 1rem !important;
    line-height: 1.6 !important;
}

/* Center-align only content items that contain images */
.content-item:has(img) {
    text-align: center !important;
}

.content-item:has(img) img {
    display: block !important;
    margin: 0 auto !important;
}

.content-item:has(img) .text-content-container {
    text-align: center !important;
}

.content-item:has(img) .rich-text-content {
    text-align: center !important;
}

.content-item:has(img) .content-title {
    text-align: center !important;
}

.content-item:has(img) .mb-3 {
    text-align: center !important;
}

/* Fallback for browsers that don't support :has() selector */
.content-item img {
    display: block !important;
    margin: 0 auto !important;
}

/* Only center content items with image content type */
.content-item[data-content-id] {
    /* Reset text alignment to default */
    text-align: left !important;
}

/* Specifically target image content items */
.content-item .content-body:has(img),
.content-item:has([src*="uploads"]),
.content-item:has([src*="static"]) {
    text-align: center !important;
}

.content-item .content-body:has(img) .mb-3,
.content-item:has([src*="uploads"]) .mb-3,
.content-item:has([src*="static"]) .mb-3 {
    text-align: center !important;
}

/* Enhanced Courses Page Styles */

/* Hero Section */
.courses-hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    padding: 4rem 0 3rem 0;
    margin-top: -20px;
    color: white;
    position: relative;
    overflow: hidden;
}

.courses-hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="white" opacity="0.1"/><circle cx="75" cy="75" r="1" fill="white" opacity="0.1"/><circle cx="50" cy="10" r="0.5" fill="white" opacity="0.1"/><circle cx="10" cy="60" r="0.5" fill="white" opacity="0.1"/><circle cx="90" cy="40" r="0.5" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    pointer-events: none;
}

.courses-hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.courses-hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
    font-weight: 300;
    line-height: 1.6;
}

.courses-stats-bar {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border-radius: 50px;
    padding: 1.5rem 2rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    max-width: 500px;
    margin: 0 auto;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.875rem;
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(255, 255, 255, 0.3);
}

/* Main Content */
.courses-main-content {
    padding: 3rem 0;
}

/* Enhanced Course Cards */
.enhanced-course-card {
    background: var(--card-background);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    border: 1px solid var(--border-color);
    height: 100%;
    display: flex;
    flex-direction: column;
    opacity: 0;
    transform: translateY(30px);
}

.enhanced-course-card.animate-in {
    opacity: 1;
    transform: translateY(0);
}

.enhanced-course-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.course-card-image-container {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.course-card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

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

.course-card-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.1) 0%, rgba(0, 0, 0, 0.3) 100%);
    display: flex;
    align-items: flex-start;
    justify-content: flex-end;
    padding: 1rem;
}

.course-level-badge {
    background: rgba(255, 255, 255, 0.95);
    color: var(--primary-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.course-card-content {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.course-card-header {
    margin-bottom: 1rem;
}

.course-card-title {
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.75rem;
    line-height: 1.3;
}

.course-card-meta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.course-meta-item {
    font-size: 0.875rem;
    color: var(--text-light);
    display: flex;
    align-items: center;
    font-weight: 500;
}

.course-meta-item i {
    color: var(--primary-color);
    font-size: 0.75rem;
}

.course-card-description {
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 1.5rem;
    flex: 1;
}

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

.course-progress-info {
    margin-bottom: 1rem;
}

.progress-bar-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.progress-bar-bg {
    flex: 1;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 3px;
    transition: width 0.3s ease;
}

.progress-text {
    font-size: 0.75rem;
    color: var(--text-light);
    font-weight: 500;
    white-space: nowrap;
}

.course-action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    padding: 0.875rem 1.5rem;
    border-radius: 12px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    width: 100%;
}

.course-action-btn:hover {
    background: var(--secondary-color);
    color: white;
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(74, 144, 226, 0.3);
}

.course-action-btn .btn-icon {
    transition: transform 0.3s ease;
}

.course-action-btn:hover .btn-icon {
    transform: translateX(4px);
}

/* Loading, Empty, and Error States */
.empty-state-icon,
.error-state-icon {
    font-size: 4rem;
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

.error-state-icon {
    color: #dc3545;
}

.empty-state-title,
.error-state-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 1rem;
}

.empty-state-text,
.error-state-text {
    color: var(--text-light);
    font-size: 1.1rem;
    line-height: 1.6;
    max-width: 500px;
    margin: 0 auto 2rem auto;
}

/* Mobile-first responsive improvements */
@media (max-width: 768px) {
    /* Reduce container padding to minimize white space */
    .container {
        max-width: 100% !important;
        padding-left: 0.75rem !important;
        padding-right: 0.75rem !important;
    }
    
    /* Reduce column padding */
    .col-12 {
        padding-left: 0.5rem !important;
        padding-right: 0.5rem !important;
    }
    
    /* Make lesson cards use full width */
    .lesson-header-card,
    .lesson-content-card,
    .lesson-navigation-top,
    .lesson-navigation-bottom,
    .page-overview {
        margin-left: 0 !important;
        margin-right: 0 !important;
    }
    
    /* Reduce card padding on mobile */
    .card-body {
        padding: 1rem !important;
    }
    
    /* Make lesson title much smaller on mobile */
    .lesson-header-card .card-title,
    .lesson-header-card h1 {
        font-size: 1.5rem !important;
        line-height: 1.3 !important;
        margin-bottom: 0.75rem !important;
    }
    
    /* Make page titles much smaller */
    .page-title {
        font-size: 1rem !important;
        line-height: 1.3 !important;
        margin-bottom: 0.75rem !important;
    }
    
    .page-description {
        font-size: 0.85rem !important;
        margin-bottom: 1rem !important;
    }
    
    /* Reduce content item padding */
    .content-item {
        padding: 0.75rem !important;
        margin-bottom: 1rem !important;
    }
    
    /* Make content titles smaller */
    .content-item h6,
    .content-title {
        font-size: 0.95rem !important;
        margin-bottom: 0.5rem !important;
    }
    
    /* Reduce navigation padding */
    .lesson-navigation-top,
    .lesson-navigation-bottom {
        padding: 0.75rem !important;
        margin-left: -0.5rem !important;
        margin-right: -0.5rem !important;
    }
    
    /* Make page overview more compact */
    .page-overview {
        margin-left: -0.5rem !important;
        margin-right: -0.5rem !important;
        margin-bottom: 1rem !important;
    }
    
    .page-overview-header {
        padding: 0.75rem 1rem !important;
    }
    
    .page-overview-content {
        padding: 0.5rem !important;
    }
    
    .page-menu-item {
        padding: 0.5rem 0.75rem !important;
        margin-bottom: 0.25rem !important;
    }
    
    .page-menu-number {
        width: 25px !important;
        height: 25px !important;
        font-size: 0.8rem !important;
        margin-right: 0.75rem !important;
    }
    
    /* Welcome card adjustments */
    .welcome-card {
        padding: 1.5rem;
        margin: 0.75rem;
    }
    
    /* Make admin modals responsive on mobile */
    #pageEditorModal .modal-content,
    #lessonContentModal .modal-content,
    #addContentModal .modal-content {
        width: 95% !important;
        max-width: none !important;
    }
    
    /* Responsive flip cards */
    .card-scene {
        height: 160px;
    }
    
    .flip-card .kana-char {
        font-size: 60px;
    }
    
    .flip-card .vocab-word {
        font-size: 36px;
    }
    
    .flip-card .vocab-reading {
        font-size: 16px;
    }
    
    .flip-card .grammar-title {
        font-size: 20px;
    }
    
    .flip-card .grammar-structure {
        font-size: 16px;
    }
    
    .flip-card .details {
        font-size: 14px;
        padding: 15px;
    }
    
    /* Courses page mobile adjustments */
    .courses-hero-section {
        padding: 2.5rem 0 2rem 0;
    }
    
    .courses-hero-title {
        font-size: 2rem;
    }
    
    .courses-hero-subtitle {
        font-size: 1rem;
        margin-bottom: 2rem;
    }
    
    .courses-stats-bar {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }
    
    .stat-item {
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }
    
    .stat-number {
        font-size: 1.5rem;
        margin-bottom: 0;
    }
    
    .stat-divider {
        display: none;
    }
    
    .course-card-image-container {
        height: 160px;
    }
    
    .course-card-title {
        font-size: 1.25rem;
    }
    
    .course-card-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .courses-main-content {
        padding: 2rem 0;
    }
}

@media (max-width: 576px) {
    /* Ultra-compact mobile layout */
    .container {
        padding-left: 0.5rem !important;
        padding-right: 0.5rem !important;
    }
    
    .col-12 {
        padding-left: 0.25rem !important;
        padding-right: 0.25rem !important;
    }
    
    /* Make lesson titles even smaller on very small screens */
    .lesson-header-card .card-title,
    .lesson-header-card h1 {
        font-size: 1.25rem !important;
        line-height: 1.2 !important;
    }
    
    .page-title {
        font-size: 0.95rem !important;
        line-height: 1.2 !important;
    }
    
    .page-description {
        font-size: 0.8rem !important;
    }
    
    /* Ultra-compact content items */
    .content-item {
        padding: 0.5rem !important;
        margin-bottom: 0.75rem !important;
    }
    
    .content-item h6,
    .content-title {
        font-size: 0.9rem !important;
    }
    
    /* Compact navigation */
    .lesson-navigation-top,
    .lesson-navigation-bottom {
        padding: 0.5rem !important;
        margin-left: -0.25rem !important;
        margin-right: -0.25rem !important;
    }
    
    .nav-btn {
        min-width: 80px !important;
        padding: 0.4rem 0.75rem !important;
        font-size: 0.85rem !important;
    }
    
    .page-counter {
        font-size: 0.9rem !important;
    }
    
    /* Compact page overview */
    .page-overview {
        margin-left: -0.25rem !important;
        margin-right: -0.25rem !important;
    }
    
    .page-overview-header {
        padding: 0.5rem 0.75rem !important;
    }
    
    .page-overview-header h6 {
        font-size: 0.9rem !important;
    }
    
    /* Courses page mobile adjustments */
    .courses-hero-title {
        font-size: 1.75rem;
    }
    
    .courses-hero-subtitle {
        font-size: 0.95rem;
    }
    
    .enhanced-course-card {
        margin-bottom: 1.5rem;
    }
    
    .course-card-content {
        padding: 1.25rem;
    }
}

/* Enhanced Course View Page Styles */

/* Course Hero Section */
.enhanced-course-hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    max-height: 800px;
    display: flex;
    align-items: center;
    overflow: hidden;
    margin-top: -20px;
}

.course-hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    filter: blur(2px);
    transform: scale(1.1);
}

.course-hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, 
        rgba(74, 144, 226, 0.9) 0%, 
        rgba(80, 227, 194, 0.8) 50%, 
        rgba(74, 144, 226, 0.9) 100%);
}

.course-hero-content {
    position: relative;
    z-index: 10;
    width: 100%;
    color: white;
}

.course-category-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 2rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.course-hero-title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    line-height: 1.1;
}

.course-hero-description {
    font-size: 1.375rem;
    font-weight: 300;
    line-height: 1.6;
    margin-bottom: 3rem;
    opacity: 0.95;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* Course Stats Row */
.course-stats-row {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.course-stat-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 1.25rem 1.75rem;
    border-radius: 20px;
    min-width: 140px;
}

.stat-icon {
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.stat-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.stat-number {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.875rem;
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
}

/* Enhanced Progress Section */
.course-progress-section {
    margin-bottom: 3rem;
}

.progress-container {
    max-width: 600px;
    margin: 0 auto;
}

.progress-track {
    position: relative;
    height: 12px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #ffffff 0%, rgba(255, 255, 255, 0.8) 100%);
    border-radius: 6px;
    transition: width 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative;
}

.progress-glow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.8);
    transition: left 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.progress-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
    opacity: 0.9;
    font-weight: 500;
}

/* Action Buttons */
.course-action-buttons {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.course-primary-btn,
.course-secondary-btn {
    display: inline-flex;
    align-items: center;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    border: 2px solid transparent;
    min-width: 200px;
    justify-content: center;
}

.course-primary-btn {
    background: white;
    color: var(--primary-color);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
}

.course-primary-btn:hover {
    background: rgba(255, 255, 255, 0.95);
    color: var(--primary-color);
    text-decoration: none;
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.course-secondary-btn {
    background: transparent;
    color: white;
    border-color: rgba(255, 255, 255, 0.5);
}

.course-secondary-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    text-decoration: none;
    border-color: white;
    transform: translateY(-3px);
}

/* Course View Lesson Cards Enhancement */
.lesson-card {
    transition: all 0.3s ease;
    margin-bottom: 1rem;
}

.lesson-card:hover {
    transform: translateY(-2px);
}

.lesson-card-link {
    display: block;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
}

.lesson-card-link:hover {
    text-decoration: none !important;
}

.lesson-card-link:hover .card {
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15) !important;
    border-color: var(--primary-color) !important;
}

.lesson-card-link:hover .lesson-title {
    color: var(--primary-color) !important;
}

.lesson-card-link:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: 0.375rem;
}

.lesson-number {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lesson-status {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.lesson-status.completed {
    background-color: #d4edda;
}

.lesson-status.in-progress {
    background-color: #fff3cd;
}

.lesson-status.not-started {
    background-color: #f8f9fa;
    border: 2px solid #dee2e6;
    color: #6c757d;
    font-weight: bold;
}

.lesson-num {
    font-size: 0.9rem;
    font-weight: bold;
}

.course-sidebar {
    position: sticky;
    top: 20px;
}

.stat-item {
    padding: 8px 0;
    border-bottom: 1px solid #f0f0f0;
}

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

.bg-gradient {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
}

/* Responsive Design for Course View */
@media (max-width: 768px) {
    .enhanced-course-hero {
        height: 80vh;
        min-height: 500px;
    }
    
    .course-hero-title {
        font-size: 2.5rem;
    }
    
    .course-hero-description {
        font-size: 1.125rem;
        margin-bottom: 2rem;
    }
    
    .course-stats-row {
        gap: 1rem;
        margin-bottom: 2rem;
    }
    
    .course-stat-item {
        min-width: 120px;
        padding: 1rem 1.25rem;
        flex-direction: column;
        text-align: center;
        gap: 0.5rem;
    }
    
    .stat-content {
        align-items: center;
    }
    
    .course-action-buttons {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .course-primary-btn,
    .course-secondary-btn {
        width: 100%;
        max-width: 300px;
    }
    
    .course-sidebar {
        position: static;
        margin-top: 2rem;
    }
}

@media (max-width: 576px) {
    .enhanced-course-hero {
        height: 70vh;
        min-height: 450px;
    }
    
    .course-hero-title {
        font-size: 2rem;
    }
    
    .course-hero-description {
        font-size: 1rem;
    }
    
    .course-stats-row {
        flex-direction: column;
        align-items: center;
        gap: 0.75rem;
    }
    
    .course-stat-item {
        width: 100%;
        max-width: 250px;
    }
    
    .course-category-badge {
        font-size: 0.75rem;
        padding: 0.5rem 1rem;
        margin-bottom: 1.5rem;
    }
}

/* Enhanced Split Layout Lesson Cards */

/* Default lesson cards (no background image) */
.lesson-card-default {
    background: white;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.lesson-card-default:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
}

/* Split layout lesson cards (with background image) */
.lesson-card-split {
    background: white;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-radius: 16px;
    border: none;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.lesson-card-split:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.15);
}

/* Image section - top 45% of the card */
.lesson-card-image-section {
    height: 180px;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    position: relative;
    overflow: hidden;
}

.lesson-card-image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        to bottom,
        rgba(0, 0, 0, 0.1) 0%,
        rgba(0, 0, 0, 0.2) 50%,
        rgba(0, 0, 0, 0.4) 100%
    );
    display: flex;
    align-items: flex-start;
    justify-content: flex-start;
    padding: 1rem;
}

.lesson-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.lesson-badges .badge {
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    font-weight: 600;
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
}

/* Content section - bottom 55% of the card */
.lesson-card-content-section {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 200px;
    background: white;
}

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

.lesson-card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.75rem;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.lesson-card-description {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 0;
}

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

.lesson-meta-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.meta-item {
    font-size: 0.85rem;
    color: var(--text-light);
    font-weight: 500;
}

/* Custom progress bar for split layout */
.lesson-progress-bar {
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 3px;
    transition: width 0.3s ease;
}

/* Action button for split layout */
.lesson-action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    padding: 0.875rem 1.5rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    border: none;
    width: 100%;
    cursor: pointer;
}

.lesson-action-btn:hover {
    background: var(--secondary-color);
    color: white;
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(74, 144, 226, 0.3);
}

.lesson-action-btn-disabled {
    background: #6c757d;
    cursor: not-allowed;
}

.lesson-action-btn-disabled:hover {
    background: #6c757d;
    transform: none;
    box-shadow: none;
}

.lesson-login-hint {
    display: block;
    text-align: center;
    margin-top: 0.75rem;
    font-size: 0.8rem;
    color: var(--text-light);
}

.lesson-login-hint a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.lesson-login-hint a:hover {
    text-decoration: underline;
}

/* Locked state for split layout cards */
.lesson-card-split.locked {
    opacity: 0.8;
}

.lesson-card-split.locked .lesson-card-image-overlay {
    background: linear-gradient(
        to bottom,
        rgba(0, 0, 0, 0.3) 0%,
        rgba(0, 0, 0, 0.5) 50%,
        rgba(0, 0, 0, 0.7) 100%
    );
}

/* Responsive adjustments for split layout */
@media (max-width: 768px) {
    .lesson-card-image-section {
        height: 140px;
    }
    
    .lesson-card-content-section {
        padding: 1.25rem;
        min-height: 180px;
    }
    
    .lesson-card-title {
        font-size: 1.1rem;
    }
    
    .lesson-card-description {
        font-size: 0.85rem;
    }
    
    .lesson-action-btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 576px) {
    .lesson-card-image-section {
        height: 120px;
    }
    
    .lesson-card-content-section {
        padding: 1rem;
        min-height: 160px;
    }
    
    .lesson-card-title {
        font-size: 1rem;
        -webkit-line-clamp: 1;
    }
    
    .lesson-card-description {
        font-size: 0.8rem;
        -webkit-line-clamp: 1;
    }
    
    .lesson-meta-row {
        flex-direction: column;
        gap: 0.25rem;
        margin-bottom: 0.75rem;
    }
    
    .lesson-badges {
        gap: 0.25rem;
    }
    
    .lesson-badges .badge {
        font-size: 0.75rem;
        padding: 0.3rem 0.6rem;
    }
}