/* Variables CSS para modo oscuro */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-card: rgba(255, 255, 255, 0.95);
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-muted: #888888;
    --border-color: #e1e5e9;
    --border-light: rgba(255, 255, 255, 0.2);
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-hover: rgba(0, 0, 0, 0.15);
    --backdrop-blur: rgba(255, 255, 255, 0.1);
    --notice-bg: rgba(255, 193, 7, 0.9);
    --notice-color: #856404;
    --notice-border: #ffeb3b;
    --footer-bg: #f8fafc;
    --footer-border: #e2e8f0;
    --footer-text: #64748b;
    --table-hover: #f5f5f5;
    --example-bg: #f8f9fa;
    --tip-bg: linear-gradient(135deg, #fff3cd 0%, #ffeaa7 100%);
    --tip-border: #ffeb3b;
    --learned-bg: linear-gradient(135deg, #e8f5e8 0%, #f0fff0 100%);
    --learned-border: #4CAF50;
    --learned-deck-bg: linear-gradient(135deg, #ffffff 0%, #f8fff8 100%);
    --unlearned-bg: #fff3cd;
    --unlearned-color: #856404;
    --all-learned-bg: #d4edda;
    --all-learned-color: #155724;
    --dark-bg-start: #0f172a;
    --dark-bg-mid: #1e1b4b;
    --dark-bg-end: #312e81;
}

html.dark-mode {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-card: rgba(45, 45, 45, 0.95);
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-muted: #999999;
    --border-color: #404040;
    --border-light: rgba(255, 255, 255, 0.1);
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-hover: rgba(0, 0, 0, 0.4);
    --backdrop-blur: rgba(0, 0, 0, 0.3);
    --notice-bg: rgba(245, 158, 11, 0.2);
    --notice-color: #fbbf24;
    --notice-border: #f59e0b;
    --footer-bg: #2d2d2d;
    --footer-border: #404040;
    --footer-text: #cccccc;
    --table-hover: #3a3a3a;
    --example-bg: #2d2d2d;
    --tip-bg: linear-gradient(135deg, rgba(245, 158, 11, 0.2) 0%, rgba(245, 158, 11, 0.1) 100%);
    --tip-border: #f59e0b;
    --learned-bg: linear-gradient(135deg, rgba(76, 175, 80, 0.2) 0%, rgba(76, 175, 80, 0.1) 100%);
    --learned-border: #4CAF50;
    --learned-deck-bg: linear-gradient(135deg, #2d2d2d 0%, rgba(76, 175, 80, 0.1) 100%);
    --unlearned-bg: rgba(245, 158, 11, 0.2);
    --unlearned-color: #fbbf24;
    --all-learned-bg: rgba(76, 175, 80, 0.2);
    --all-learned-color: #4ade80;
    --dark-bg-start: #0f172a;
    --dark-bg-mid: #1e1b4b;
    --dark-bg-end: #312e81;
}

/* Aplicación de variables */
body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    transition: all 0.3s ease;
}

html.dark-mode {
    background: linear-gradient(135deg, var(--dark-bg-start) 0%, var(--dark-bg-mid) 50%, var(--dark-bg-end) 100%);
    color: var(--text-primary);
}

.level-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.level-card:hover {
    box-shadow: 0 12px 40px var(--shadow-hover);
}

.level-card.special {
    background: linear-gradient(135deg, rgba(74, 144, 226, 0.1) 0%, var(--bg-card) 100%);
    border-color: #4A90E2;
}

html.dark-mode .level-card.special {
    background: linear-gradient(135deg, #1e40af 0%, #1d4ed8 100%);
    border-color: #3b82f6;
}

.level-header h3 {
    color: var(--text-primary);
}

.tab {
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

/* Restored UI Fixes */
.header-logo {
    height: 45px;
    width: auto;
    margin-right: 20px;
    vertical-align: middle;
}

.notice {
    background: var(--notice-bg);
    color: var(--notice-color);
    border: 1px solid var(--notice-border);
    transition: all 0.3s ease;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.notice a {
    color: #1a1a1a !important;
    /* Unified dark color */
    font-weight: 500;
    text-decoration: underline;
}

html.dark-mode .notice a {
    color: #cbd5e1 !important;
    /* Lighter color for dark mode readability */
}

/* End Restored UI Fixes */

html.dark-mode .tab {
    background: var(--backdrop-blur);
    border-color: var(--border-light);
}

html.dark-mode .tab:hover {
    background: rgba(255, 255, 255, 0.1);
}

html.dark-mode .tab.active {
    background: rgba(255, 255, 255, 0.2);
}

.notice {
    background: var(--notice-bg);
    color: var(--notice-color);
    border: 1px solid var(--notice-border);
    transition: all 0.3s ease;
}

.description p {
    color: var(--text-secondary);
}

.grammar-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.grammar-card:hover {
    box-shadow: 0 8px 25px var(--shadow-hover);
}

.card-header h3 {
    color: var(--text-primary);
}

.card-description {
    color: var(--text-secondary);
}

.modal {
    backdrop-filter: blur(5px);
}

.modal-content {
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.modal-body h4,
.modal-body h5 {
    color: var(--text-primary);
}

.modal-body p,
.modal-body li {
    color: var(--text-secondary);
}

.comparison-table tr:hover {
    background-color: var(--table-hover);
}

.comparison-table th,
.comparison-table td {
    border-bottom: 1px solid var(--border-color);
}

.example-box {
    background: var(--example-bg);
    border-left: 4px solid #4A90E2;
    transition: all 0.3s ease;
}

.tip-box {
    background: var(--tip-bg);
    border: 1px solid var(--tip-border);
    transition: all 0.3s ease;
}

.footer {
    background: var(--footer-bg);
    border-top: 1px solid var(--footer-border);
    transition: all 0.3s ease;
}

.footer-content {
    color: var(--footer-text);
}

.made-with {
    color: var(--footer-text);
}

.setting-item {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.setting-info h3 {
    color: var(--text-primary);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.btn-outline {
    border: 1px solid #667eea;
    color: #667eea;
    transition: all 0.3s ease;
}

html.dark-mode .btn-outline {
    border-color: #3b82f6;
    color: #3b82f6;
}

html.dark-mode .btn-outline:hover {
    background: #3b82f6;
    color: white;
}

.setting-select {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.setting-select:focus {
    border-color: #667eea;
}

html.dark-mode .setting-select:focus {
    border-color: #3b82f6;
}

.settings-panel {
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.settings-header {
    border-bottom: 1px solid var(--border-color);
}

.settings-header h2 {
    color: var(--text-primary);
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.close-btn:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.deck-card {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.deck-card:hover {
    border-color: #4facfe;
    box-shadow: 0 10px 25px var(--shadow-hover);
}

.deck-card h3 {
    color: var(--text-primary);
}

.deck-card p {
    color: var(--text-secondary);
}

.deck-stats {
    color: var(--text-muted);
}

.form-section {
    background: var(--bg-secondary);
    transition: all 0.3s ease;
}

.form-group label {
    color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: #4facfe;
}

html.dark-mode .form-group input:focus,
html.dark-mode .form-group textarea:focus,
html.dark-mode .form-group select:focus {
    border-color: #3b82f6;
}

.image-upload {
    border: 2px dashed var(--border-color);
    background: var(--bg-primary);
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.image-upload:hover {
    border-color: #4facfe;
}

html.dark-mode .image-upload:hover {
    border-color: #3b82f6;
    background: rgba(59, 130, 246, 0.1);
}

html.dark-mode::-webkit-scrollbar {
    width: 8px;
}

html.dark-mode::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

html.dark-mode::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

html.dark-mode::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

html.dark-mode .btn:focus,
html.dark-mode .tab:focus,
html.dark-mode .toggle-switch input:focus+.slider {
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}

html.dark-mode {
    color-scheme: dark;
}

* {
    transition: background-color 0.3s ease,
        color 0.3s ease,
        border-color 0.3s ease,
        box-shadow 0.3s ease;
}

html.dark-mode .level-page-header {
    color: var(--text-primary);
}

html.dark-mode .level-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
}

html.dark-mode .section-title {
    color: var(--text-primary);
}

html.dark-mode .back-btn {
    background: var(--backdrop-blur);
    border: 1px solid var(--border-light);
    color: var(--text-primary);
}

html.dark-mode .back-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

html.dark-mode .volver-btn {
    background-color: #3b82f6;
    color: white;
}

html.dark-mode .volver-btn:hover {
    background-color: #1d4ed8;
}

html.dark-mode h1,
html.dark-mode h2,
html.dark-mode h3,
html.dark-mode h4,
html.dark-mode h5,
html.dark-mode h6 {
    color: var(--text-primary);
}

html.dark-mode p,
html.dark-mode span,
html.dark-mode div {
    color: var(--text-secondary);
}

html.dark-mode .fas,
html.dark-mode .far,
html.dark-mode i {
    color: inherit;
}

html.dark-mode .level-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(59, 130, 246, 0.2);
}

html.dark-mode .action-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.2);
}

@media (max-width: 768px) {
    html.dark-mode {
        background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    }

    html.dark-mode .settings-panel {
        background: var(--bg-primary);
        color: var(--text-primary);
    }
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    text-align: center;
    margin-bottom: 30px;
}

.main-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: white;
    margin-bottom: 20px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
}

.tab {
    padding: 12px 24px;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    text-decoration: none;
    border-radius: 25px;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.tab:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.tab.active {
    background: rgba(255, 255, 255, 0.3);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.notice {
    background: rgba(255, 193, 7, 0.9);
    color: #856404;
    padding: 12px 20px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    backdrop-filter: blur(10px);
}

.notice i {
    font-size: 1.1rem;
}

.description {
    text-align: center;
    margin-bottom: 40px;
}

.description p {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 400;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 28px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 200px;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, #4A90E2 0%, #357ABD 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(74, 144, 226, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #357ABD 0%, #2968A3 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(74, 144, 226, 0.4);
}

.btn-secondary {
    background: linear-gradient(135deg, #6C757D 0%, #5A6268 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(108, 117, 125, 0.3);
}

.btn-secondary:hover {
    background: linear-gradient(135deg, #5A6268 0%, #495057 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(108, 117, 125, 0.4);
}

.btn-generate {
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(40, 167, 69, 0.3);
}

.btn-generate:hover {
    background: linear-gradient(135deg, #218838 0%, #1e7e34 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(40, 167, 69, 0.4);
}

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

.footer {
    margin-top: 60px;
    text-align: center;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
}

.heart-icon {
    color: #e74c3c;
    animation: heartbeat 1.5s ease-in-out infinite;
}

@keyframes heartbeat {

    0%,
    50%,
    100% {
        transform: scale(1);
    }

    25%,
    75% {
        transform: scale(1.1);
    }
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    margin-bottom: 20px;
    padding: 8px 16px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.back-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateX(-3px);
}

.level-page-header {
    text-align: center;
    margin-bottom: 40px;
}

.level-title {
    font-size: 2.2rem;
    font-weight: 700;
    color: white;
    margin-bottom: 10px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.level-description {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 20px;
}

.level-content {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    max-width: 600px;
    margin: 0 auto;
}

.pdf-actions {
    display: flex;
    flex-direction: column;
    gap: 15px;
    align-items: center;
}

.grammar-section {
    margin-bottom: 40px;
}

.section-title {
    font-size: 1.8rem;
    font-weight: 600;
    color: white;
    text-align: center;
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.grammar-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.grammar-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.grammar-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 15px;
    flex-wrap: wrap;
    gap: 10px;
}

.card-header h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: #333;
    margin: 0;
    flex: 1;
}

.difficulty-badge {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.difficulty-badge.beginner {
    background: #d4edda;
    color: #155724;
}


.difficulty-badge.intermediate {
    background: #fef3c7;
    color: #92400e;
}

.dark-mode .difficulty-badge.intermediate {
    background: #451a03;
    color: #fbbf24;
}

.difficulty-badge.advanced {
    background: #fecaca;
    color: #991b1b;
}

.dark-mode .difficulty-badge.advanced {
    background: #450a0a;
    color: #ef4444;
}

.difficulty-badge.hardadvanced {
    background: #555555;
    color: #ffffff !important;
}

.dark-mode .difficulty-badge.hardadvanced {
    background: #343232;
    color: #ffffff !important;
}

.card-description {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.5;
    margin-bottom: 20px;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-content {
    background: white;
    border-radius: 15px;
    width: 100%;
    max-width: 800px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 25px 30px;
    border-bottom: 1px solid #eee;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 15px 15px 0 0;
}

.modal-header h3 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 600;
}

.close-modal {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 5px;
    border-radius: 50%;
    transition: background-color 0.3s ease;
}

.close-modal:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.modal-body {
    padding: 30px;
}

.modal-body h4 {
    color: #333;
    font-size: 1.3rem;
    margin-bottom: 15px;
    font-weight: 600;
}

.modal-body h5 {
    color: #4A90E2;
    font-size: 1.1rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.modal-body p {
    color: #666;
    line-height: 1.6;
    margin-bottom: 15px;
}

.modal-body ul {
    color: #666;
    margin-left: 20px;
    margin-bottom: 20px;
}

.modal-body li {
    margin-bottom: 8px;
    line-height: 1.5;
}

.example-box {
    background: #f8f9fa;
    border-left: 4px solid #4A90E2;
    padding: 15px 20px;
    margin: 15px 0;
    border-radius: 0 8px 8px 0;
}

.example-box p {
    margin-bottom: 8px;
    font-family: 'Courier New', monospace;
    font-weight: 500;
}

.tip-box {
    background: linear-gradient(135deg, #fff3cd 0%, #ffeaa7 100%);
    border: 1px solid #ffeb3b;
    border-radius: 8px;
    padding: 15px;
    margin: 20px 0;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.tip-box i {
    color: #ff9800;
    margin-top: 2px;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.comparison-table th,
.comparison-table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

.comparison-table th {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    font-weight: 600;
}

.comparison-table tr:hover {
    background-color: #f5f5f5;
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    .main-title {
        font-size: 2rem;
    }

    .tabs {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        min-width: 180px;
        padding: 12px 20px;
    }

    .grammar-cards {
        grid-template-columns: 1fr;
    }

    .modal-content {
        margin: 10px;
        max-height: 95vh;
    }

    .modal-header {
        padding: 20px;
    }

    .modal-body {
        padding: 20px;
    }

    .comparison-table {
        font-size: 0.9rem;
    }

    .comparison-table th,
    .comparison-table td {
        padding: 8px 10px;
    }
}

/* Footer */
.footer {
    background: #f8fafc;
    padding: 20px 40px;
    border-top: 1px solid #e2e8f0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: #64748b;
    font-size: 0.9rem;
}

.made-with {
    font-weight: 500;
}

.heart-icon {
    color: #ef4444;
    animation: heartbeat 1.5s ease-in-out infinite;
}

@keyframes heartbeat {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}


.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    min-height: calc(100vh - 40px);
}

.header {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    padding: 30px;
    text-align: center;
    color: white;
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

.content {
    padding: 30px;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.deck-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.deck-card {
    background: white;
    border: 2px solid #e9ecef;
    border-radius: 15px;
    padding: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.deck-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    border-color: #4facfe;
}

.deck-card h3 {
    color: #333;
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.deck-card p {
    color: #666;
    margin-bottom: 15px;
}

.deck-stats {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: #888;
}

.create-deck-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 30px;
}

.create-deck-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.form-section {
    background: #f8f9fa;
    padding: 30px;
    border-radius: 15px;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #333;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e9ecef;
    border-radius: 10px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #4facfe;
}

.image-upload {
    border: 2px dashed #ccc;
    border-radius: 10px;
    padding: 30px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.image-upload:hover {
    border-color: #4facfe;
    background: #f8f9ff;
}

.image-upload.has-image {
    border-style: solid;
    border-color: #4facfe;
}

.image-preview {
    max-width: 200px;
    max-height: 200px;
    border-radius: 10px;
    margin: 10px 0;
}

.btn {
    background: #4facfe;
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 25px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-right: 10px;
}

.btn:hover {
    background: #3d8bfe;
    transform: translateY(-2px);
}

.btn-secondary {
    background: #6c757d;
}

.btn-secondary:hover {
    background: #5a6268;
}

.volver-btn {
    display: inline-block;
    margin: 10px 0;
    padding: 12px 24px;
    background-color: #1976d2;
    color: white;
    text-decoration: none;
    border-radius: 10px;
    font-weight: bold;
    text-align: center;
    transition: background-color 0.3s ease, transform 0.2s ease;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    font-size: 16px;
}

.volver-btn:hover {
    background-color: #0d47a1;
    transform: translateY(-2px);
}

.volver-btn:active {
    transform: translateY(0);
}

.learned-section {
    margin-bottom: 40px;
    padding: 25px;
    background: linear-gradient(135deg, #e8f5e8 0%, #f0fff0 100%);
    border-radius: 15px;
    border-left: 5px solid #4CAF50;
}

.normal-section {
    margin-bottom: 20px;
}

.section-header {
    margin-bottom: 25px;
    text-align: center;
}

.section-header h2 {
    color: #333;
    margin-bottom: 8px;
    font-size: 1.8rem;
    font-weight: 700;
}

.section-header p {
    color: #666;
    font-size: 1.1rem;
}

.learned-deck {
    background: linear-gradient(135deg, #ffffff 0%, #f8fff8 100%);
    border: 2px solid #4CAF50;
    box-shadow: 0 8px 25px rgba(76, 175, 80, 0.15);
}

.learned-deck:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 35px rgba(76, 175, 80, 0.25);
    border-color: #45a049;
}

.unlearned-count {
    background: #fff3cd;
    color: #856404;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 600;
}

.all-learned {
    background: #d4edda;
    color: #155724;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 600;
}

a {
    color: inherit;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
    color: inherit;
}

.quick-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.action-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid #e1e5e9;
}

.action-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.action-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 15px;
}

.action-icon i {
    font-size: 20px;
    color: white;
}

.action-content h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: #333;
}

.action-content p {
    color: #666;
    font-size: 14px;
    margin-bottom: 15px;
    line-height: 1.5;
}

.settings-section {
    margin-bottom: 30px;
}

.settings-section h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: #333;
}

.settings-grid {
    display: grid;
    gap: 15px;
}

.setting-item {
    background: white;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    border: 1px solid #e1e5e9;
    display: flex;
    align-items: center;
    gap: 15px;
}

.setting-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.setting-icon i {
    font-size: 16px;
    color: white;
}

.setting-content {
    flex: 1;
}



.setting-info h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: #333;
}

.setting-info p {
    color: #666;
    font-size: 0.875rem;
    margin: 0;
}


.setting-action {
    flex-shrink: 0;
}

.btn-outline {
    background: transparent;
    color: #667eea;
    border: 1px solid #667eea;
    padding: 8px 12px;
    border-radius: 6px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.btn-outline:hover {
    background: #667eea;
    color: white;
}

.setting-select {
    padding: 8px 12px;
    border: 1px solid #dee2e6;
    border-radius: 6px;
    background: white;
    color: #333;
    font-size: 1rem;
    cursor: pointer;
}

.setting-select:focus {
    outline: none;
    border-color: #667eea;
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: 0.4s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: 0.4s;
    border-radius: 50%;
}

input:checked+.slider {
    background-color: #667eea;
}

input:checked+.slider:before {
    transform: translateX(26px);
}

.dark-mode .action-card,
.dark-mode .setting-item,
.dark-mode .level-card {
    background: #2d2d2d;
    border-color: #404040;
}


.dark-mode .setting-select {
    background: #2d2d2d;
    color: white;
    border-color: #404040;
}

.dark-mode .btn-secondary {
    background: #404040;
    color: white;
    border-color: #555;
}

.dark-mode .btn-secondary:hover {
    background: #555;
}

.settings-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.settings-overlay.active {
    opacity: 1;
    visibility: visible;
}

.settings-panel {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    background: white;
    border-radius: 16px;
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
}

.dark-mode .settings-panel {
    background: #2d2d2d;
    color: white;
}

.dark-mode .settings-header {
    border-bottom-color: #404040;
}

.dark-mode .settings-header h2 {
    color: white;
}

.settings-overlay.active .settings-panel {
    transform: translate(-50%, -50%) scale(1);
}

.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid #e1e5e9;
}

.settings-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
    color: #333;
}

.setting-content h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: #333;
}

.setting-content p {
    color: #666;
    font-size: 0.875rem;
    margin: 0;
}

.setting-select {
    padding: 8px 12px;
    border: 1px solid #dee2e6;
    border-radius: 8px;
    /* Slightly softer */
    background: white;
    color: #333;
    font-size: 1rem;
    /* Preventing zoom on mobile, consistent size */
    cursor: pointer;
}

@media (max-width: 768px) {
    .quick-actions {
        grid-template-columns: 1fr;
    }

    .action-card {
        padding: 15px;
    }

    .setting-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .setting-action {
        width: 100%;
        display: flex;
        justify-content: flex-end;
    }
}

@media (min-width: 769px) {

    .carousel-indicators,
    .swipe-hint,
    .carousel-container::before,
    .carousel-container::after {
        display: none !important;
    }

    /* Restore Grids */
    .levels-grid,
    .features-grid,
    .tech-grid,
    .screenshots-grid {
        display: grid !important;
        overflow: visible !important;
    }

    /* Show all cards */
    .level-card,
    .feature-card,
    .tech-item,
    .screenshot-placeholder {
        display: block !important;
        opacity: 1 !important;
        visibility: visible !important;
    }

    /* Hide Mobile Flashcard Section */
    .flashcard-section {
        display: none !important;
    }
}

/* --- CAROUSEL ITEMS (Sizing) --- */
.carousel-container .levels-grid>.level-card:not(.special),
.levels-carousel-container .levels-grid>.level-card:not(.special),
.carousel-container .features-grid>.feature-card {
    flex: 0 0 85% !important;
    min-width: 280px !important;
    scroll-snap-align: center;
    scroll-snap-stop: always;
}

.carousel-container .tech-grid>.tech-item {
    margin-top: 15px !important;
    opacity: 1 !important;
    visibility: visible !important;
}

.flashcard-section .level-card {
    width: 100% !important;
    display: block !important;
}

/* --- INDICATORS (From Critical Fixes - Tiny Dots) --- */
.carousel-indicators {
    display: flex !important;
    justify-content: center;
    gap: 6px !important;
    margin-top: 10px !important;
    padding: 5px !important;
    background: none !important;
}

.carousel-indicator {
    width: 5px !important;
    height: 5px !important;
    border-radius: 50% !important;
    background: rgba(255, 255, 255, 0.35) !important;
    border: none !important;
    padding: 0 !important;
}

.carousel-indicator.active {
    width: 14px !important;
    border-radius: 3px !important;
    background: rgba(255, 255, 255, 0.85) !important;
}

/* --- CRITICAL SPACING FIXES --- */
/* Remove default margins that cause gaps */
.content>* {
    margin-bottom: 0 !important;
}

/* Uniform Spacing between sections */
.hero-dashboard,
.mission-section,
.features-dashboard,
.developer-section,
.roadmap-section,
.support-project-section {
    margin-bottom: 25px !important;
    padding: 30px 20px !important;
    /* Uniform padding */
}

/* Fix Header Spacing */
.header {
    padding: 15px !important;
    margin-bottom: 0 !important;
}

/* Fix Description Box */
.description {
    margin: 10px 0 15px 0 !important;
}

/* Hide Notice when Logged In (CRITICAL) */
body.user-logged-in .notice {
    display: none !important;
}

/* --- TOUCH OPTIMIZATIONS --- */
button,
.btn,
.tab {
    min-height: 44px !important;
    /* Apple Human Interface Guidelines */
}

/* Smooth Scroll */
html {
    scroll-behavior: smooth;
}



* {
    transition: background-color 0.3s ease,
        color 0.3s ease,
        border-color 0.3s ease,
        box-shadow 0.3s ease !important;
    /* Removed: all properties, width, height, padding, margin */
}

/* Allow only safe transitions on cards */
.level-card,
.feature-card,
.grammar-card,
.deck-card,
.action-card,
.setting-item,
.donation-card,
.developer-card {
    transition: transform 0.3s ease,
        box-shadow 0.3s ease,
        opacity 0.3s ease,
        background-color 0.3s ease,
        border-color 0.3s ease !important;
    /* NOT transitioning: width, height, padding, margin, flex, min-width, max-width */
}

/* Buttons can animate safely */
.btn,
.tab,
.btn-primary,
.btn-secondary,
.btn-generate,
.btn-outline,
.contact-btn,
.download-btn,
.donate-btn {
    transition: transform 0.3s ease,
        background 0.3s ease,
        color 0.3s ease,
        border-color 0.3s ease,
        box-shadow 0.3s ease !important;
}

/* Prevent carousel items from transitioning size during scroll */
@media (max-width: 768px) {

    .carousel-container .level-card,
    .carousel-container .feature-card,
    .carousel-container .tech-item,
    .levels-carousel-container .level-card {
        transition: transform 0.3s ease,
            box-shadow 0.3s ease,
            opacity 0.3s ease !important;
        /* No width/height transitions during carousel scroll */
    }
}

/* Al final del archivo, busca la sección de .level-card o agrégalo después */

/* Flashcard Special Card Styling */
.level-card.special {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    border: none;
    box-shadow: 0 8px 25px rgba(245, 87, 108, 0.3);
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.level-card.special::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
        opacity: 0.5;
    }

    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

.level-card.special .level-header h3 {
    color: white;
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 8px;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.level-card.special .level-subtitle {
    color: rgba(255, 255, 255, 0.95);
    font-size: 1.1rem;
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    opacity: 0.9;
}

.level-card.special:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(245, 87, 108, 0.5);
}

/* Dark mode version */
html.dark-mode .level-card.special {
    background: linear-gradient(135deg, #c471ed 0%, #f64f59 100%);
    box-shadow: 0 8px 25px rgba(198, 113, 237, 0.4);
}

html.dark-mode .level-card.special:hover {
    box-shadow: 0 15px 40px rgba(198, 113, 237, 0.6);
}

/* ========================================
   COLOR PALETTE (ORIGINAL)
   ======================================== */
:root {
    /* Original Beautiful Gradient */
    --gradient-start: #667eea;
    --gradient-end: #764ba2;

    /* Light Mode */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-card: rgba(255, 255, 255, 0.95);
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-muted: #888888;
    --border-color: #e1e5e9;

    /* Original Blues/Purples */
    --accent-blue: #4A90E2;
    --accent-purple: #667eea;
    --accent-light-purple: #818cf8;
    --accent-pink: #f093fb;

    /* Status Colors (Original) */
    --success-green: #4CAF50;
    --warning-yellow: #fbbf24;
    --danger-red: #ef4444;
    --info-blue: #60a5fa;
}

html.dark-mode {
    /* Dark Mode - Same Color Family */
    --bg-primary: #1e293b;
    --bg-secondary: #0f172a;
    --bg-card: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #475569;

    /* Keep Same Blues/Purples */
    --accent-blue: #60a5fa;
    --accent-purple: #818cf8;
    --accent-light-purple: #a78bfa;
    --accent-pink: #f093fb;

    /* Adjusted for dark mode */
    --success-green: #4ade80;
    --warning-yellow: #fbbf24;
    --danger-red: #f87171;
    --info-blue: #60a5fa;
}

/* ========================================
   1. FLASHCARD APP VISIBILITY FIX
   ======================================== */
.level-card.special {
    background: linear-gradient(135deg, #f6f5ff 0%, #3369be 100%) !important;

    box-shadow: 0 10px 30px rgba(70, 34, 133, 0.5) !important;
    color: white !important;
}

.level-card.special .level-header h3 {
    color: white !important;
    font-size: 1.8rem !important;
    font-weight: 700 !important;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.4) !important;
}

.level-card.special .level-subtitle {
    color: rgba(255, 255, 255, 0.95) !important;
    font-size: 1.1rem !important;
    font-weight: 500 !important;
    text-shadow: 0 1px 5px rgba(0, 0, 0, 0.3) !important;
}

html.dark-mode .level-card.special {
    background: linear-gradient(135deg, #47474b 0%, #0c2674 100%) !important;


}

/* ========================================
   2. SETTINGS X BUTTON - BLUE THEME
   ======================================== */
.settings-header {
    position: relative;
    padding: 24px 24px !important;
}

.settings-header h2 {
    padding-right: 50px !important;
}

.close-btn {
    position: absolute !important;
    top: 20px !important;
    right: 20px !important;
    width: 40px !important;
    height: 40px !important;
    min-width: 40px !important;
    min-height: 40px !important;
    /* BLUE THEME - Not red! */
    background: rgba(102, 126, 234, 0.15) !important;
    border: 2px solid rgba(102, 126, 234, 0.3) !important;
    border-radius: 50% !important;
    color: #667eea !important;
    font-size: 1.4rem !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    cursor: pointer !important;
    transition: all 0.3s ease !important;
    z-index: 100 !important;
}

.close-btn:hover {
    background: rgba(102, 126, 234, 0.25) !important;
    border-color: #667eea !important;
    transform: scale(1.1) !important;
}

html.dark-mode .close-btn {
    background: rgba(129, 140, 248, 0.2) !important;
    border-color: rgba(129, 140, 248, 0.4) !important;
    color: #818cf8 !important;
}

html.dark-mode .close-btn:hover {
    background: rgba(129, 140, 248, 0.35) !important;
    border-color: #818cf8 !important;
}

/* Mobile */
@media (max-width: 768px) {
    .settings-header {
        padding: 20px 15px !important;
    }

    .close-btn {
        top: 15px !important;
        right: 15px !important;
        width: 44px !important;
        height: 44px !important;
        min-width: 44px !important;
        min-height: 44px !important;
        font-size: 1.5rem !important;
    }
}

/* ========================================
   3. SEARCH BAR DARK MODE - BLUE THEME
   ======================================== */
.search-box input {
    width: 100%;
    padding: 10px 12px 10px 38px;
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    background: #f8fafc;
    color: #333;
}

.search-box input:focus {
    outline: none;
    border-color: #667eea;
    background: white;
}

html.dark-mode .search-box input {
    background: #334155 !important;
    color: #f1f5f9 !important;
    border: 2px solid #475569 !important;
}

html.dark-mode .search-box input:focus {
    border-color: #818cf8 !important;
    background: #475569 !important;
}

html.dark-mode .search-box input::placeholder {
    color: #94a3b8 !important;
}

html.dark-mode .search-box i {
    color: #94a3b8 !important;
}

/* Topics Panel */
html.dark-mode .topics-panel {
    background: #1e293b !important;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5) !important;
}

html.dark-mode .panel-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
}

html.dark-mode .topic-item {
    background: #334155 !important;
    color: #f1f5f9 !important;
}

html.dark-mode .topic-item:hover {
    background: #818cf8 !important;
    color: white !important;
}

html.dark-mode .topic-item i {
    color: #818cf8 !important;
}

html.dark-mode .topic-item:hover i {
    color: white !important;
}

/* ========================================
   4. DIFFICULTY BADGES - ORIGINAL COLORS
   ======================================== */

/* BÁSICO - Green (Original) */
.difficulty-badge.beginner {
    background: #d4edda;
    color: #155724;
}

html.dark-mode .difficulty-badge.beginner {
    background: rgba(74, 222, 128, 0.2) !important;
    color: #4ade80 !important;
    border: 1px solid rgba(74, 222, 128, 0.3) !important;
    font-weight: 600 !important;
}

/* INTERMEDIO - Blue (Original) */
.difficulty-badge.intermediate {
    background: #fef3c7;
    color: #92400e;
}

html.dark-mode .difficulty-badge.intermediate {
    background: rgba(96, 165, 250, 0.2) !important;
    color: #60a5fa !important;
    border: 1px solid rgba(96, 165, 250, 0.3) !important;
    font-weight: 600 !important;
}

/* AVANZADO - Purple (Original) */
.difficulty-badge.advanced {
    background: #fecaca;
    color: #991b1b;
}

html.dark-mode .difficulty-badge.advanced {
    background: rgba(129, 140, 248, 0.2) !important;
    color: #818cf8 !important;
    border: 1px solid rgba(129, 140, 248, 0.3) !important;
    font-weight: 600 !important;
}

/* EXPERTO - Orange (Original) */
.difficulty-badge.hardadvanced {
    background: #555555;
    color: #191919;
}

html.dark-mode .difficulty-badge.hardadvanced {
    background: rgba(251, 191, 36, 0.2) !important;
    color: #fbbf24 !important;
    border: 1px solid rgba(251, 191, 36, 0.3) !important;
    font-weight: 600 !important;
}

/* ========================================
   5. CONSISTENT DARK MODE - ORIGINAL PALETTE
   ======================================== */

/* Background gradients */
body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

html.dark-mode {
    background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #312e81 100%) !important;
}

/* Container */
html.dark-mode .container {
    background: #1e293b !important;
    border: 1px solid #334155 !important;
}

/* Cards */
html.dark-mode .level-card,
html.dark-mode .grammar-card,
html.dark-mode .action-card,
html.dark-mode .deck-card {
    background: #334155 !important;
    border: 1px solid #475569 !important;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4) !important;
}

html.dark-mode .level-card:hover,
html.dark-mode .grammar-card:hover,
html.dark-mode .action-card:hover,
html.dark-mode .deck-card:hover {
    border-color: #818cf8 !important;
    box-shadow: 0 8px 25px rgba(129, 140, 248, 0.3) !important;
}

/* Description box */
html.dark-mode .description {
    background: rgba(15, 23, 42, 0.8) !important;
    backdrop-filter: blur(10px) !important;
}

html.dark-mode .description p {
    color: #cbd5e1 !important;
}

/* Notice - Blue theme */
html.dark-mode .notice {
    background: rgba(96, 165, 250, 0.15) !important;
    color: #60a5fa !important;
    border: 1px solid rgba(96, 165, 250, 0.3) !important;
}

html.dark-mode .notice i {
    color: #60a5fa !important;
}

/* Modal */
html.dark-mode .modal-content {
    background: #1e293b !important;
    border: 1px solid #334155 !important;
}

html.dark-mode .modal-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
    border-bottom: 1px solid #475569 !important;
}

html.dark-mode .modal-body {
    background: #1e293b !important;
}

html.dark-mode .modal-body h4,
html.dark-mode .modal-body h5 {
    color: #818cf8 !important;
}

/* Tables */
html.dark-mode .comparison-table th {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
}

html.dark-mode .comparison-table td {
    background: #334155 !important;
    color: #cbd5e1 !important;
    border-bottom: 1px solid #475569 !important;
}

html.dark-mode .comparison-table tr:hover td {
    background: #475569 !important;
}

/* Buttons - Original Blue */
.btn-primary {
    background: linear-gradient(135deg, #4A90E2 0%, #357ABD 100%);
}

html.dark-mode .btn-primary {
    background: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%) !important;
}

html.dark-mode .btn-primary:hover {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%) !important;
}

/* Tabs */
html.dark-mode .tab {
    background: rgba(15, 23, 42, 0.8);
    border-color: rgba(71, 85, 105, 0.5);
}

html.dark-mode .tab:hover {
    background: rgba(129, 140, 248, 0.1);
}

html.dark-mode .tab.active {
    background: rgba(129, 140, 248, 0.2);
}

/* ========================================
   6. PROFILE PAGE - BLUE THEME
   ======================================== */

/* Profile Header */
html.dark-mode .profile-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
}

/* Avatar Button */
.change-avatar-btn {
    background: #667eea !important;
}

.change-avatar-btn:hover {
    background: #5568d3 !important;
}

html.dark-mode .change-avatar-btn {
    background: #818cf8 !important;
}

html.dark-mode .change-avatar-btn:hover {
    background: #a78bfa !important;
}

/* Level Badge */
html.dark-mode .level-badge {
    background: rgba(96, 165, 250, 0.2) !important;
    color: #60a5fa !important;
    border: 1px solid rgba(96, 165, 250, 0.3) !important;
}

/* Streak Section */
html.dark-mode .streak-section {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.2) 0%, rgba(249, 115, 22, 0.2) 100%) !important;
    border: 1px solid rgba(239, 68, 68, 0.3) !important;
}

/* Form Sections */
html.dark-mode .profile-form-section,
html.dark-mode .preferences-section,
html.dark-mode .account-actions {
    background: #334155 !important;
    border: 1px solid #475569 !important;
}

html.dark-mode .profile-form-section h3 {
    color: #818cf8 !important;
}

html.dark-mode .preferences-section h3 {
    color: #60a5fa !important;
}

html.dark-mode .account-actions h3 {
    color: #fbbf24 !important;
}

/* Inputs */
html.dark-mode .profile-form input,
html.dark-mode .profile-form textarea,
html.dark-mode .profile-form select,
html.dark-mode .pref-select,
html.dark-mode .pref-input {
    background: #1e293b !important;
    color: #f1f5f9 !important;
    border: 2px solid #475569 !important;
}

html.dark-mode .profile-form input:focus,
html.dark-mode .profile-form textarea:focus,
html.dark-mode .profile-form select:focus,
html.dark-mode .pref-select:focus,
html.dark-mode .pref-input:focus {
    border-color: #818cf8 !important;
}

/* Preference Items */
html.dark-mode .pref-item {
    background: #1e293b !important;
    border: 1px solid #475569 !important;
}

html.dark-mode .pref-info i {
    color: #818cf8 !important;
}

/* Toggle Switch - Blue */
.toggle-switch input:checked+.slider {
    background-color: #667eea;
}

html.dark-mode .toggle-switch input:checked+.slider {
    background-color: #818cf8 !important;
}

html.dark-mode .toggle-switch .slider {
    background-color: #475569 !important;
}

/* ========================================
   7. SETTINGS PANEL - FULL BLUE THEME
   ======================================== */
html.dark-mode .settings-panel {
    background: #1e293b !important;
}

html.dark-mode .settings-header {
    border-bottom-color: #475569 !important;
}

html.dark-mode .setting-item {
    background: #334155 !important;
    border: 1px solid #475569 !important;
}

html.dark-mode .setting-icon {
    background: #475569 !important;
}

html.dark-mode .setting-icon i {
    color: #818cf8 !important;
}

html.dark-mode .setting-select {
    background: #1e293b !important;
    color: #f1f5f9 !important;
    border: 1px solid #475569 !important;
}

/* ========================================
   8. MOBILE CONSISTENCY
   ======================================== */
@media (max-width: 768px) {
    html.dark-mode {
        background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #312e81 100%) !important;
    }

    html.dark-mode .container,
    html.dark-mode .level-card,
    html.dark-mode .grammar-card {
        background: #334155 !important;
        border: 1px solid #475569 !important;
    }

    html.dark-mode .settings-panel {
        background: #1e293b !important;
        border-top: 1px solid #475569 !important;
    }
}

/* ========================================
   9. EXAMPLE & TIP BOXES - BLUE THEME
   ======================================== */
html.dark-mode .example-box {
    background: #334155 !important;
    border-left: 4px solid #818cf8 !important;
}

html.dark-mode .tip-box {
    background: rgba(129, 140, 248, 0.1) !important;
    border: 1px solid rgba(129, 140, 248, 0.3) !important;
}

html.dark-mode .tip-box i {
    color: #818cf8 !important;
}

/* ========================================
   10. FOCUS STATES - BLUE THEME
   ======================================== */
html.dark-mode button:focus,
html.dark-mode input:focus,
html.dark-mode textarea:focus,
html.dark-mode select:focus {
    outline: 2px solid #818cf8 !important;
    outline-offset: 2px;
}

/* ========================================
   11. LEVEL PAGES STYLES
   ======================================== */

.level-page-header {
    text-align: center;
    padding: 40px 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 15px;
    margin-bottom: 30px;
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.2);
}

.level-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.level-description {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

.level-content {
    margin-bottom: 30px;
}

.pdf-actions {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.grammar-section {
    margin-top: 40px;
}

.section-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.8rem;
    color: #333;
    margin-bottom: 25px;
    padding-bottom: 10px;
    border-bottom: 2px solid #e2e8f0;
}

.section-title i {
    color: #667eea;
}

.grammar-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
}

.grammar-card {
    background: white;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.grammar-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
    border-color: #667eea;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 15px;
}

.grammar-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: #2d3748;
    margin: 0;
    line-height: 1.4;
}

.card-description {
    color: #64748b;
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 20px;
    flex-grow: 1;
}

.card-actions {
    margin-top: auto;
}

.explanation-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

/* Dark Mode Overrides for Level Pages */
html.dark-mode .level-page-header {
    background: linear-gradient(135deg, #312e81 0%, #4c1d95 100%);
}

html.dark-mode .section-title {
    color: #f1f5f9;
    border-bottom-color: #475569;
}

html.dark-mode .section-title i {
    color: #818cf8;
}

html.dark-mode .grammar-card {
    background: #1e293b;
    border-color: #475569;
}

html.dark-mode .grammar-card:hover {
    border-color: #818cf8;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
}

html.dark-mode .grammar-card h3 {
    color: #f1f5f9;
}

html.dark-mode .card-description {
    color: #94a3b8;
}

html.dark-mode .difficulty-badge.beginner {
    background-color: #064e3b;
    color: #6ee7b7;
}

html.dark-mode .difficulty-badge.intermediate {
    background-color: #1e3a8a;
    color: #93c5fd;
}

html.dark-mode .difficulty-badge.advanced {
    background-color: #7f1d1d;
    color: #fca5a5;
}

/* Fix for lists losing padding due to reset */
ul,
ol {
    padding-left: 25px;
    margin-bottom: 1rem;
}

li {
    margin-bottom: 0.5rem;
}

/* Fix for missing scrollbar */
.container {
    overflow: visible !important;
}