/* Modern Color System */
:root {
    --primary-color: #2196f3;
    --primary-dark: #1976d2;
    --primary-light: #64b5f6;
    --secondary-color: #667eea;
    --accent-color: #4caf50;
    --accent-dark: #388e3c;
    --surface-color: #ffffff;
    --background-color: #f5f5f5;
    --background-dark: #1a1a2e;
    --text-primary: #2c3e50;
    --text-secondary: #6c757d;
    --text-light: #ffffff;
    --border-color: #e9ecef;
    --border-dark: #dee2e6;
    --shadow-light: 0 2px 8px rgba(0,0,0,0.1);
    --shadow-medium: 0 4px 16px rgba(0,0,0,0.15);
    --shadow-strong: 0 8px 32px rgba(0,0,0,0.2);
    --border-radius: 8px;
    --border-radius-small: 4px;
    --border-radius-large: 12px;
    --transition: all 0.2s ease;
    --transition-slow: all 0.3s ease;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
}

body {
    background: linear-gradient(135deg, var(--background-color) 0%, #e3f2fd 100%);
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    min-height: 100vh;
}

h1.page-title {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

/* Email Verification Styles */
.email-verified {
    color: #28a745;
    font-size: 0.85em;
    font-weight: 500;
    margin-left: var(--spacing-xs);
}

.email-unverified {
    color: #ffc107;
    font-size: 0.85em;
    font-weight: 500;
    margin-left: var(--spacing-xs);
}

/* User card email verification indicators */
.user-card.email-verified {
    border-left: 4px solid #28a745;
}

.user-card.email-unverified {
    border-left: 4px solid #ffc107;
}

/* Management stats for verified/unverified users */
.management-stats .stat-card.verified {
    border-left: 4px solid #28a745;
}

.management-stats .stat-card.unverified {
    border-left: 4px solid #ffc107;
}

.management-stats .stat-card.verified .stat-label {
    color: #28a745;
}

.management-stats .stat-card.unverified .stat-label {
    color: #ffc107;
}

/* Additional user email styling */
.user-email {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

/* ================== MOBILE RESPONSIVE IMPROVEMENTS FOR MAIN APP ================== */

/* Viewport meta tag should be in HTML: <meta name="viewport" content="width=device-width, initial-scale=1.0"> */

/* Container and Layout Improvements */
.container {
    max-width: 100%;
    overflow-x: hidden;
}

.main-layout {
    display: flex;
    min-height: calc(100vh - 120px);
}

.sidebar {
    width: 280px;
    flex-shrink: 0;
    background: white;
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    transition: all 0.3s ease;
}

.content {
    flex: 1;
    padding: var(--spacing-lg);
    min-width: 0;
    background: var(--background-color);
}

/* Header Improvements */
.app-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--text-light);
    padding: var(--spacing-lg) var(--spacing-xl);
    box-shadow: var(--shadow-medium);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.app-title {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-light);
}

.app-subtitle {
    margin: 0;
    font-size: 0.9rem;
    opacity: 0.8;
    color: var(--text-light);
}




/* Responsive Mobile Styles */
@media (max-width: 768px) {
    /* Hide desktop hamburger and sidebar */
    .mobile-menu-toggle {
        display: none !important;
    }
    
    .sidebar {
        display: none;
    }
    
    .sidebar-overlay {
        display: none;
    }
    
    
    /* Adjust main layout for mobile */
    .main-layout {
        flex-direction: column;
        min-height: auto;
    }
    
    .content {
        margin-left: 0;
        padding: var(--spacing-md);
        padding-bottom: 90px; /* Space for bottom tab bar */
        width: 100%;
    }
    
    /* Hide footer on mobile to make room for bottom tabs */
    .app-footer {
        display: none;
    }
    
    /* Header responsive adjustments */
    .app-header {
        padding: var(--spacing-md) var(--spacing-lg);
        position: relative;
        z-index: 1001;
    }
    
    .header-content {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: flex-start;
    }
    
    .header-left {
        width: 100%;
        justify-content: space-between;
        align-items: center;
    }
    
    .header-title-section {
        text-align: left;
    }
    
    .app-title {
        font-size: 1.2rem;
    }
    
    .app-subtitle {
        font-size: 0.8rem;
    }
    
    .header-right {
        width: 100%;
        justify-content: space-between;
        align-items: center;
        flex-wrap: wrap;
    }
    
    /* User info mobile adjustments */
    .header-user-info {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
    
    .user-account,
    .user-status {
        font-size: 0.8rem;
    }
    
    /* Login button mobile adjustments */
    .login-btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.8rem;
    }
    
    /* Sidebar mobile styles */
    .sidebar-header h2 {
        font-size: 1.2rem;
        margin: var(--spacing-md) 0;
    }
    
    .sidebar-section {
        margin-bottom: var(--spacing-lg);
    }
    
    .sidebar-section-title {
        font-size: 0.9rem;
        margin-bottom: var(--spacing-sm);
    }
    
    .sidebar-section-list {
        list-style: none;
        padding: 0;
        margin: 0;
    }
    
    .sidebar-section-list li {
        margin-bottom: var(--spacing-xs);
    }
    
    .sidebar-section-list a {
        display: block;
        padding: var(--spacing-sm) var(--spacing-md);
        color: var(--text-primary);
        text-decoration: none;
        border-radius: var(--border-radius-small);
        transition: var(--transition);
        min-height: 44px;
        display: flex;
        align-items: center;
    }
    
    .sidebar-section-list a:hover {
        background: var(--background-color);
        color: var(--primary-color);
    }
    
    /* Submenu mobile styles */
    .has-submenu > ul {
        padding-left: var(--spacing-lg);
        margin-top: var(--spacing-xs);
    }
    
    .has-submenu > ul li a {
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: 0.9rem;
        min-height: 40px;
    }
    
    /* Cards and content mobile adjustments */
    .card, .content-card {
        margin-bottom: var(--spacing-md);
        padding: var(--spacing-md);
    }
    
    /* Form elements mobile improvements */
    input, textarea, select, button {
        font-size: 16px; /* Prevents zoom on iOS */
        min-height: 44px;
    }
    
    button {
        padding: var(--spacing-sm) var(--spacing-md);
        cursor: pointer;
        touch-action: manipulation;
    }
}

@media (max-width: 480px) {
    /* Extra small screens */
    .app-title {
        font-size: 1rem;
    }
    
    .app-subtitle {
        display: none;
    }
    
    .content {
        padding: var(--spacing-sm);
    }
    
    .sidebar {
        width: 250px;
        left: -250px;
    }
    
    .login-btn-text {
        display: none;
    }
    
    .header-user-info .user-account,
    .header-user-info .user-status {
        max-width: 120px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }
}

/* Desktop styles - ensure proper behavior on larger screens */
@media (min-width: 769px) {
    .mobile-menu-toggle {
        display: none !important;
    }
    
    .sidebar-overlay {
        display: none !important;
    }
    
    .sidebar {
        position: static;
        left: auto;
        transform: none;
    }
    
    .main-layout {
        flex-direction: row;
    }
}

/* ================== TYPESCRIPT-GENERATED UI RESPONSIVE STYLES ================== */

/* Learning Cards Responsive */
.cards-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.memory-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-medium);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.memory-card:hover {
    box-shadow: var(--shadow-medium);
    transform: translateY(-2px);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.card-topic {
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
    word-break: break-word;
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    word-break: break-word;
}

.card-question {
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
    word-break: break-word;
}

.card-image {
    margin: var(--spacing-md) 0;
    text-align: center;
}

.question-image {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius-small);
    box-shadow: var(--shadow-light);
}

.card-answers {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.card-answer {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
}

.card-answer:hover {
    border-color: var(--primary-color);
    background: var(--background-color);
}

.answer-content {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    gap: var(--spacing-sm);
    min-height: 44px;
}

.answer-text {
    flex: 1;
    word-break: break-word;
}

.answer-icon {
    flex-shrink: 0;
    font-size: 1.2rem;
}

.check-answers-button {
    background: var(--primary-color);
    color: var(--text-light);
    border: none;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-medium);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: var(--spacing-lg);
    width: 100%;
    min-height: 44px;
}

.check-answers-button:hover {
    background: var(--primary-color-dark);
    transform: translateY(-1px);
}

/* Filter Container Responsive */
.filter-container {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-medium);
}

.topic-filter {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    font-size: 1rem;
    min-height: 44px;
}

/* Popup/Modal Responsive */
.popup-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing-lg);
}

.popup-content {
    background: white;
    border-radius: var(--border-radius-medium);
    padding: var(--spacing-xl);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-strong);
    text-align: center;
}

.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.popup-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.popup-message {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
}

.popup-close-button {
    background: var(--primary-color);
    color: var(--text-light);
    border: none;
    padding: var(--spacing-sm) var(--spacing-xl);
    border-radius: var(--border-radius-medium);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    min-height: 44px;
}

.popup-close-button:hover {
    background: var(--primary-color-dark);
}

/* Management Tables Responsive */
.management-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: var(--border-radius-medium);
    overflow: hidden;
    box-shadow: var(--shadow-light);
}

.management-table th,
.management-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.management-table th {
    background: var(--background-color);
    font-weight: 600;
    color: var(--text-primary);
}

.management-table-container {
    overflow-x: auto;
    margin-bottom: var(--spacing-lg);
    border-radius: var(--border-radius-medium);
    border: 1px solid var(--border-color);
}

/* Management Cards (for mobile) */
.management-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-medium);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-light);
}

.management-card-header {
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.management-card-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.management-card-row {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid var(--border-light);
}

.management-card-row:last-child {
    border-bottom: none;
}

.management-card-label {
    font-weight: 600;
    color: var(--text-secondary);
}

.management-card-value {
    word-break: break-word;
    text-align: right;
}

/* Mobile Responsive Styles for TypeScript Components */
@media (max-width: 768px) {
    .cards-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .memory-card {
        padding: var(--spacing-md);
    }
    
    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
    
    .card-topic {
        font-size: 0.8rem;
        width: 100%;
    }
    
    .card-title {
        font-size: 1rem;
    }
    
    .answer-content {
        padding: var(--spacing-sm);
    }
    
    .popup-container {
        padding: var(--spacing-md);
        align-items: flex-start;
        padding-top: 10vh;
    }
    
    .popup-content {
        padding: var(--spacing-lg);
        margin: 0;
        max-height: 80vh;
    }
    
    .popup-icon {
        font-size: 2rem;
    }
    
    /* Hide table on mobile, show cards instead */
    .management-table-container {
        display: none;
    }
    
    .management-cards-mobile {
        display: block;
    }
    
    /* Touch improvements */
    .card-answer,
    .topic-filter,
    .check-answers-button,
    .popup-close-button {
        min-height: 44px;
        touch-action: manipulation;
    }
}

@media (max-width: 480px) {
    .cards-container {
        gap: var(--spacing-sm);
    }
    
    .memory-card {
        padding: var(--spacing-sm);
    }
    
    .popup-container {
        padding: var(--spacing-sm);
    }
    
    .popup-content {
        padding: var(--spacing-md);
    }
}

/* Desktop - Show tables, hide mobile cards */
@media (min-width: 769px) {
    .management-table-container {
        display: block;
    }
    
    .management-cards-mobile {
        display: none;
    }
}

/* ================== PURE JAVASCRIPT-GENERATED UI RESPONSIVE STYLES ================== */

/* TopicsScript.js - Topics Management Responsive */
.topics-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--border-radius-medium);
    box-shadow: var(--shadow-light);
}

.topics-header {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
    text-align: center;
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--primary-color);
}

.topic-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--background-color);
    border-radius: var(--border-radius-medium);
    flex-wrap: wrap;
}

.topic-stat {
    text-align: center;
    padding: var(--spacing-md);
    background: white;
    border-radius: var(--border-radius-small);
    box-shadow: var(--shadow-light);
    min-width: 150px;
}

.topic-stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    display: block;
    margin-bottom: var(--spacing-xs);
}

.topic-stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.btn-new-topic {
    background: var(--primary-color);
    color: var(--text-light);
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--border-radius-medium);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: var(--spacing-xl);
    display: block;
    margin-left: auto;
    margin-right: auto;
    min-height: 44px;
    box-shadow: var(--shadow-light);
}

.btn-new-topic:hover {
    background: var(--primary-color-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.topic-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-medium);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.topic-card:hover {
    box-shadow: var(--shadow-medium);
    transform: translateY(-4px);
    border-color: var(--primary-color);
}

.topic-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.topic-card-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-color);
    margin: 0;
    flex: 1;
    word-break: break-word;
}

.topic-card-id {
    background: var(--background-color);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-small);
    font-size: 0.8rem;
    font-weight: 600;
}

.topic-card-body {
    margin-bottom: var(--spacing-lg);
}

.topic-card-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.topic-card-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
    flex-wrap: wrap;
}

.topic-card-action {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--background-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.8rem;
    min-height: 32px;
    min-width: 60px;
}

.topic-card-action:hover {
    background: var(--primary-color);
    color: var(--text-light);
    border-color: var(--primary-color);
}

/* NewCardScript.js - Card Creation Form Responsive */
.memory-card-creation {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: var(--border-radius-medium);
    box-shadow: var(--shadow-light);
    padding: var(--spacing-xl);
}

.card-creation-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--primary-color);
}

.card-creation-header h2 {
    color: var(--primary-color);
    margin: 0;
    font-size: 1.8rem;
}

.image-preview-container {
    margin-top: var(--spacing-md);
    text-align: center;
    padding: var(--spacing-md);
    background: var(--background-color);
    border-radius: var(--border-radius-small);
}

.image-preview {
    max-width: 100%;
    max-height: 200px;
    border-radius: var(--border-radius-small);
    box-shadow: var(--shadow-light);
}

.add-answer-button {
    background: var(--secondary-color);
    color: var(--text-light);
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-medium);
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    min-height: 44px;
    justify-content: center;
}

.add-answer-button:hover {
    background: var(--secondary-color-dark);
    transform: translateY(-1px);
}

.save-card-button {
    background: var(--success-color);
    color: var(--text-light);
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--border-radius-medium);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: var(--spacing-xl);
    width: 100%;
    min-height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    box-shadow: var(--shadow-medium);
}

.save-card-button:hover {
    background: var(--success-color-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-strong);
}

/* Migration Management Responsive */
.migration-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

.migration-tabs {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
    background: var(--background-color);
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-medium);
    overflow-x: auto;
}

.tab-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    background: transparent;
    color: var(--text-secondary);
    border: none;
    border-radius: var(--border-radius-small);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
    white-space: nowrap;
    min-height: 44px;
    flex-shrink: 0;
}

.tab-btn.active {
    background: var(--primary-color);
    color: var(--text-light);
    box-shadow: var(--shadow-light);
}

.tab-btn:hover:not(.active) {
    background: rgba(0,0,0,0.05);
    color: var(--text-primary);
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.summary-container {
    background: white;
    border-radius: var(--border-radius-medium);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-light);
}

.summary-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.stat-item {
    background: var(--background-color);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-medium);
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.stat-item:hover {
    box-shadow: var(--shadow-light);
    transform: translateY(-2px);
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
    display: block;
    margin-bottom: var(--spacing-sm);
}

.stat-value.text-success {
    color: var(--success-color);
}

.stat-value.text-danger {
    color: var(--danger-color);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    flex-direction: column;
    gap: var(--spacing-md);
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255,255,255,0.3);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-text {
    color: white;
    font-size: 1.1rem;
    font-weight: 500;
}

/* Mobile Responsive for JavaScript Components */
@media (max-width: 768px) {
    /* Topics Management Mobile */
    .topics-container {
        padding: var(--spacing-md);
        margin: var(--spacing-sm);
    }
    
    .topics-header {
        font-size: 1.4rem;
        margin-bottom: var(--spacing-lg);
    }
    
    .topic-stats {
        flex-direction: column;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
    }
    
    .topic-stat {
        min-width: 100%;
    }
    
    .topic-stat-number {
        font-size: 2rem;
    }
    
    .topics-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .topic-card {
        padding: var(--spacing-md);
    }
    
    .topic-card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
    
    .topic-card-actions {
        justify-content: flex-start;
        width: 100%;
    }
    
    .topic-card-action {
        flex: 1;
        text-align: center;
        min-height: 44px;
    }
    
    /* Card Creation Mobile */
    .memory-card-creation {
        margin: var(--spacing-sm);
        padding: var(--spacing-lg);
    }
    
    .card-creation-header h2 {
        font-size: 1.4rem;
    }
    
    .add-answer-button,
    .save-card-button {
        width: 100%;
        justify-content: center;
    }
    
    /* Migration Management Mobile */
    .migration-container {
        padding: var(--spacing-sm);
    }
    
    .migration-tabs {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
    
    .tab-btn {
        width: 100%;
        text-align: center;
    }
    
    .summary-container {
        padding: var(--spacing-lg);
        margin: var(--spacing-sm) 0;
    }
    
    .summary-stats {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-md);
    }
    
    .stat-item {
        padding: var(--spacing-md);
    }
    
    .stat-value {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .topics-header {
        font-size: 1.2rem;
    }
    
    .topic-stat-number {
        font-size: 1.8rem;
    }
    
    .topic-card {
        padding: var(--spacing-sm);
    }
    
    .memory-card-creation {
        padding: var(--spacing-md);
    }
    
    .summary-stats {
        grid-template-columns: 1fr;
    }
    
    .stat-value {
        font-size: 1.3rem;
    }
    
    .migration-tabs {
        padding: var(--spacing-xs);
    }
}