/**
 * Component Styles - Reusable UI component styles
 * Buttons, cards, modals, forms, and other interactive elements
 */

/* Import unified component styles */
@import url('./components-ui.css');

/* =============================================================================
   UNIFIED DRS SPECIFIC STYLES
   ============================================================================= */

.drs-main-card {
    margin: 16px 0;
    min-height: 200px;
}

.drs-progress {
    margin-bottom: 20px;
}

.drs-actions {
    display: flex;
    gap: 12px;
    margin-top: 16px;
    justify-content: space-between;
    align-items: center;
}

.drs-instruction {
    font-size: 16px;
    font-weight: 600;
    color: #374151;
    margin-bottom: 16px;
    padding: 12px;
    background: #f8fafc;
    border-radius: 8px;
    border-left: 4px solid #3b82f6;
}

.drs-text-content,
.drs-audio-content,
.drs-image-content,
.drs-grammar-content {
    padding: 8px 0;
}

.drs-text-passage {
    background: #f9fafb;
    padding: 16px;
    border-radius: 8px;
    margin-bottom: 16px;
    line-height: 1.6;
    color: #374151;
}

.drs-question {
    font-size: 16px;
    font-weight: 500;
    color: #111827;
    margin: 16px 0 12px 0;
}

.drs-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 12px;
}

.drs-option {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.drs-option:hover {
    border-color: #3b82f6;
    background: #eff6ff;
}

.drs-option input {
    margin: 0;
}

.drs-audio-player {
    text-align: center;
    margin: 16px 0;
}

.drs-audio-player audio {
    width: 100%;
    max-width: 400px;
}

.drs-image-container {
    text-align: center;
    margin: 16px 0;
}

.drs-image {
    max-width: 100%;
    max-height: 300px;
    border-radius: 8px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.drs-sentence {
    font-size: 18px;
    line-height: 1.6;
    margin: 16px 0;
    padding: 16px;
    background: #f8fafc;
    border-radius: 8px;
}

.drs-blank {
    border: none;
    border-bottom: 2px solid #3b82f6;
    background: transparent;
    padding: 2px 8px;
    margin: 0 4px;
    min-width: 80px;
    text-align: center;
    font-size: inherit;
    color: #3b82f6;
    font-weight: 600;
}

.drs-blank:focus {
    outline: none;
    border-bottom-color: #1d4ed8;
    background: #eff6ff;
}

.drs-explanation {
    background: #f0f9ff;
    padding: 12px;
    border-radius: 8px;
    margin-top: 12px;
    border-left: 4px solid #0ea5e9;
    font-size: 14px;
    color: #0c4a6e;
}

.drs-hint-panel,
.drs-result-panel {
    margin-top: 16px;
}

@media (max-width: 768px) {
    .drs-actions {
        flex-direction: column;
        gap: 8px;
    }

    .drs-actions > * {
        width: 100%;
    }

    .drs-instruction {
        font-size: 14px;
        padding: 10px;
    }

    .drs-sentence {
        font-size: 16px;
        padding: 12px;
    }
}

:root {
    --primary-color: #3b82f6;
    --accent-color: #8b5cf6;
    --gradient-start: #f8fafc;
    --gradient-end: #e2e8f0;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

/* Coming Soon Containers */
.coming-soon-container {
    text-align: center;
    padding: 3rem 2rem;
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    border-radius: 12px;
    margin: 2rem 0;
    border: 1px solid var(--border-light);
}

.coming-soon-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.coming-soon-container h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.coming-soon-container p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.coming-soon-details {
    background: rgba(255, 255, 255, 0.1);
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 2rem;
    backdrop-filter: blur(10px);
}

.coming-soon-details ul {
    text-align: left;
    max-width: 400px;
    margin: 1rem auto;
    list-style-type: none;
    padding: 0;
}

.coming-soon-details li {
    padding: 0.5rem 0;
    color: var(--text-primary);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.coming-soon-details li:last-child {
    border-bottom: none;
}

.coming-soon-details code {
    background: rgba(0, 0, 0, 0.2);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    color: var(--accent-color);
}

/* Games Grid and Cards */
.games-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.game-card {
    background: linear-gradient(135deg, var(--card-background) 0%, rgba(255, 255, 255, 0.05) 100%);
    border: 1px solid var(--border-light);
    border-radius: 12px;
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.game-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    border-color: var(--primary-color);
}

.game-card.low-compatibility {
    opacity: 0.7;
    border-color: #ff6b6b;
}

.game-icon {
    font-size: 3rem;
    text-align: center;
    margin-bottom: 1rem;
}

.game-info h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.game-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 0.9rem;
    line-height: 1.4;
}

.game-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.difficulty-badge {
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
}

.difficulty-beginner {
    background: #4ade80;
    color: #065f46;
}

.difficulty-intermediate {
    background: #fbbf24;
    color: #92400e;
}

.difficulty-advanced {
    background: #f87171;
    color: #991b1b;
}

.compatibility-score {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.2rem 0.6rem;
    border-radius: 8px;
}

.compatibility-score.high {
    background: #dcfce7;
    color: #166534;
}

.compatibility-score.medium {
    background: #fef3c7;
    color: #92400e;
}

.compatibility-score.low {
    background: #fee2e2;
    color: #991b1b;
}

.compatibility-details {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-style: italic;
}

.games-subtitle {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.no-games-container {
    text-align: center;
    padding: 3rem 2rem;
    background: var(--card-background);
    border-radius: 12px;
    margin: 2rem 0;
}

.no-games-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.no-games-container h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.suggestions {
    text-align: left;
    max-width: 400px;
    margin: 1.5rem auto 0;
}

.suggestions ul {
    margin: 0.5rem 0;
    padding-left: 1.5rem;
}

.suggestions li {
    color: var(--text-secondary);
    margin: 0.25rem 0;
}

/* Memory Game Styles */
.memory-game {
    max-width: 800px;
    margin: 0.5rem auto;
    padding: 1rem;
    background: linear-gradient(135deg, #f0f4f8 0%, #e2e8f0 100%);
    border-radius: 20px;
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
}

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

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding: 1rem 1.5rem;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-lg);
    position: relative;
}

.game-header::before {
    content: '🎮';
    position: absolute;
    top: -8px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 1.5rem;
    background: white;
    padding: 0 1rem;
    border-radius: 50px;
    box-shadow: var(--shadow-md);
}

.game-stats {
    display: flex;
    gap: 2rem;
}

.stat {
    text-align: center;
    position: relative;
    padding: 0.5rem;
}

.stat-label {
    display: block;
    font-size: 0.75rem;
    color: #64748b;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin-bottom: 1rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 16px;
    backdrop-filter: blur(5px);
}

.memory-card {
    width: 120px;
    height: 120px;
    perspective: 1000px;
    cursor: pointer;
    position: relative;
    margin: 0;
    padding: 0;
    border: none;
    outline: none;
}

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s;
    transform-style: preserve-3d;
    border-radius: 8px;
    margin: 0;
    padding: 0;
}

.memory-card.flipped .card-inner {
    transform: rotateY(180deg);
}

.memory-card.matched {
    animation: successPulse 0.8s ease-in-out;
}

.memory-card.matched .card-inner {
    transform: rotateY(180deg);
    background: linear-gradient(135deg, #10b981, #34d399);
    border-radius: 8px;
}

.memory-card.matched .card-back {
    background: linear-gradient(135deg, #10b981, #34d399);
    color: white;
    border-color: #059669;
    font-weight: bold;
}

.memory-card.removing {
    animation: cardDisappear 0.6s ease-in-out forwards;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transform: scale(0);
}

@keyframes successPulse {
    0%, 100% { transform: scale(1); }
    25% { transform: scale(1.1); }
    50% { transform: scale(1.15) rotate(5deg); }
    75% { transform: scale(1.1) rotate(-5deg); }
}

@keyframes cardDisappear {
    0% {
        transform: scale(1) rotate(0deg);
        opacity: 1;
    }
    50% {
        transform: scale(1.2) rotate(10deg);
        opacity: 0.8;
    }
    100% {
        transform: scale(0) rotate(45deg);
        opacity: 0;
        visibility: hidden;
    }
}

.card-front,
.card-back {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    text-align: center;
    padding: 8px;
    box-sizing: border-box;
    margin: 0;
}

.card-front {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: white;
    font-size: 1.5rem;
    z-index: 2;
}


.card-back {
    background: white;
    color: #1e293b;
    transform: rotateY(180deg);
    font-size: 0.8rem;
    line-height: 1.2;
    z-index: 1;
    border: 1px solid #e2e8f0;
}

.memory-card:hover .card-front {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--primary-color) 100%);
}

/* Victory Popup - Generic for all games */
.victory-popup {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: victoryFadeIn 0.5s ease-out;
}

.victory-content {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border-radius: 24px;
    padding: 3rem 2.5rem;
    max-width: 500px;
    width: 90%;
    text-align: center;
    box-shadow: var(--shadow-xl);
    border: 2px solid rgba(255, 255, 255, 0.2);
    position: relative;
    animation: victorySlideIn 0.6s ease-out 0.2s both;
}

.victory-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #10b981, #34d399, #6ee7b7);
    border-radius: 24px 24px 0 0;
}

.victory-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1e293b;
    margin: 0 0 1rem 0;
    background: linear-gradient(135deg, var(--success-color), #34d399);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.victory-emoji {
    font-size: 4rem;
    margin-bottom: 1rem;
    display: block;
    animation: victoryBounce 1s ease-in-out infinite;
}

.victory-scores {
    margin: 2rem 0;
    padding: 1.5rem;
    background: rgba(16, 185, 129, 0.1);
    border-radius: 16px;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.score-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 0.75rem 0;
    font-size: 1.1rem;
}

.score-label {
    font-weight: 600;
    color: #374151;
}

.score-value {
    font-weight: 700;
    color: var(--success-color);
}

.score-value.new-best {
    color: #f59e0b;
    animation: newBestGlow 1s ease-in-out infinite;
}

.victory-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
    flex-wrap: wrap;
    justify-content: center;
}

.victory-btn {
    flex: 1;
    min-width: 140px;
    padding: 1rem 1.5rem;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.victory-btn-primary {
    background: linear-gradient(135deg, var(--success-color), #34d399);
    color: white;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.victory-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

.victory-btn-secondary {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.victory-btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.victory-btn-tertiary {
    background: #f1f5f9;
    color: #475569;
    border: 2px solid #e2e8f0;
}

.victory-btn-tertiary:hover {
    background: #e2e8f0;
    transform: translateY(-1px);
}

@keyframes victoryFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes victorySlideIn {
    from {
        opacity: 0;
        transform: scale(0.8) translateY(20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

@keyframes victoryBounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

@keyframes newBestGlow {
    0%, 100% { text-shadow: 0 0 5px rgba(245, 158, 11, 0.5); }
    50% { text-shadow: 0 0 20px rgba(245, 158, 11, 0.8), 0 0 30px rgba(245, 158, 11, 0.4); }
}

.game-message {
    text-align: center;
    padding: 1.5rem 2rem;
    border-radius: 16px;
    margin: 2rem 0;
    font-weight: 600;
    font-size: 1.1rem;
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.game-message::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    border-radius: 16px 16px 0 0;
}

.game-message.success {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(16, 185, 129, 0.05) 100%);
    color: var(--success-color);
    border-color: rgba(16, 185, 129, 0.3);
}

.game-message.success::before {
    background: linear-gradient(90deg, var(--success-color), #34d399);
}

.game-message.info {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(59, 130, 246, 0.05) 100%);
    color: var(--primary-color);
    border-color: rgba(59, 130, 246, 0.3);
}

.game-message.info::before {
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
}

.game-error {
    text-align: center;
    padding: 2rem;
    background: #fee2e2;
    border: 1px solid #fecaca;
    border-radius: 12px;
    margin: 2rem 0;
}

.error-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.game-error h3 {
    color: #dc2626;
    margin-bottom: 1rem;
}

.game-error p {
    color: #991b1b;
    margin-bottom: 1.5rem;
}

.game-loading {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.loading-spinner {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.game-container {
    min-height: 600px;
}

.game-area {
    background: var(--card-background);
    border-radius: 12px;
    padding: 1rem;
    min-height: 500px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    border: none;
    border-radius: 0.375rem;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    min-height: 44px; /* Touch-friendly minimum */
    gap: 0.5rem;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Button Variants */
.btn-primary {
    background-color: #3182ce;
    color: white;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.btn-primary:hover:not(:disabled) {
    background-color: #2c5282;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(49, 130, 206, 0.3);
}

.btn-secondary {
    background-color: #edf2f7;
    color: #4a5568;
    border: 1px solid #e2e8f0;
}

.btn-secondary:hover:not(:disabled) {
    background-color: #e2e8f0;
    border-color: #cbd5e0;
}

.btn-success {
    background-color: #38a169;
    color: white;
}

.btn-success:hover:not(:disabled) {
    background-color: #2f855a;
}

.btn-danger {
    background-color: #e53e3e;
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background-color: #c53030;
}

/* Button Sizes */
.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
    min-height: 36px;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1rem;
    min-height: 52px;
}

/* Cards */
.card {
    background: white;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    border: 1px solid #e2e8f0;
    overflow: hidden;
    transition: all 0.2s ease-in-out;
}

.card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transform: translateY(-2px);
}

.card-header {
    padding: 1rem;
    border-bottom: 1px solid #e2e8f0;
    background-color: #f7fafc;
}

.card-body {
    padding: 1rem;
}

.card-footer {
    padding: 1rem;
    border-top: 1px solid #e2e8f0;
    background-color: #f7fafc;
}

/* Grid Layout */
.grid {
    display: grid;
    gap: 1rem;
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: 1fr;
    }
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.modal {
    background: white;
    border-radius: 0.5rem;
    box-shadow: 0 20px 25px rgba(0, 0, 0, 0.25);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalSlideIn 0.3s ease-out;
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: #718096;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.25rem;
}

.modal-close:hover {
    background-color: #f7fafc;
    color: #2d3748;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid #e2e8f0;
    display: flex;
    gap: 0.5rem;
    justify-content: flex-end;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: #374151;
    margin-bottom: 0.25rem;
}

.form-input {
    width: 100%;
    padding: 0.75rem;
    font-size: 0.875rem;
    border: 1px solid #d1d5db;
    border-radius: 0.375rem;
    background-color: white;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-input:focus {
    outline: none;
    border-color: #3182ce;
    box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.1);
}

.form-input:invalid {
    border-color: #e53e3e;
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

.form-select {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.5rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    padding-right: 2.5rem;
}

/* Progress Bar */
.progress {
    width: 100%;
    height: 0.5rem;
    background-color: #e2e8f0;
    border-radius: 0.25rem;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background-color: #3182ce;
    border-radius: 0.25rem;
    transition: width 0.3s ease;
}

.progress-bar.success {
    background-color: #38a169;
}

.progress-bar.warning {
    background-color: #d69e2e;
}

.progress-bar.danger {
    background-color: #e53e3e;
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.badge-primary {
    background-color: #dbeafe;
    color: #1e40af;
}

.badge-success {
    background-color: #d1fae5;
    color: #065f46;
}

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

.badge-danger {
    background-color: #fee2e2;
    color: #991b1b;
}

/* Tooltips */
.tooltip {
    position: relative;
    display: inline-block;
    cursor: help;
}

.tooltip:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background-color: #1a202c;
    color: white;
    padding: 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    white-space: nowrap;
    z-index: 1000;
    margin-bottom: 0.25rem;
}

.tooltip:hover::before {
    content: '';
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 4px solid transparent;
    border-top-color: #1a202c;
    z-index: 1000;
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 0.375rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
}

.alert-info {
    background-color: #dbeafe;
    border-color: #bfdbfe;
    color: #1e40af;
}

.alert-success {
    background-color: #d1fae5;
    border-color: #a7f3d0;
    color: #065f46;
}

.alert-warning {
    background-color: #fef3c7;
    border-color: #fde68a;
    color: #92400e;
}

.alert-danger {
    background-color: #fee2e2;
    border-color: #fecaca;
    color: #991b1b;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.hidden { display: none !important; }
.visible { display: block !important; }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }

.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-4 { padding: 1rem; }

.w-full { width: 100%; }
.h-full { height: 100%; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }

/* Animations */
.fade-in {
    animation: fadeIn 0.3s ease-in;
}

.slide-up {
    animation: slideUp 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Hero Section Styles */
.hero-container {
    position: relative;
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.08) 0%, rgba(118, 75, 162, 0.12) 100%);
    z-index: -1;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 25% 25%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.hero-content {
    text-align: center;
    max-width: 600px;
    animation: slideUp 0.8s ease-out;
}

.hero-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: #6b7280;
    margin-bottom: 1rem;
    font-weight: 500;
}

.hero-description {
    font-size: 1rem;
    color: #9ca3af;
    margin-bottom: 2.5rem;
    line-height: 1.6;
}

.action-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.action-buttons .btn {
    padding: 1rem 2rem;
    font-size: 1rem;
    min-width: 200px;
    border-radius: 50px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.action-buttons .btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: all 0.3s ease;
}

.action-buttons .btn:hover::before {
    width: 300px;
    height: 300px;
}

.action-buttons .btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    box-shadow: 0 8px 32px rgba(102, 126, 234, 0.3);
}

.action-buttons .btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(102, 126, 234, 0.4);
}

.action-buttons .btn-secondary {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: #4a5568;
}

.action-buttons .btn-secondary:hover {
    background: rgba(255, 255, 255, 1);
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.1);
}

.secondary-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.secondary-buttons .btn {
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
    min-width: 140px;
    border-radius: 25px;
    transition: all 0.3s ease;
}

.btn-outline {
    background: transparent;
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: #6b7280;
    backdrop-filter: blur(10px);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(102, 126, 234, 0.5);
    color: #667eea;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.2);
}

.btn-icon {
    font-size: 1.2em;
    margin-right: 0.5rem;
}

.btn-text {
    font-weight: 600;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature {
    text-align: center;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(15px);
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    transition: all 0.3s ease;
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.15);
}

.feature:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-text {
    font-weight: 600;
    color: #4a5568;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-container {
        min-height: 70vh;
        padding: 1rem;
    }

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

    .action-buttons .btn {
        min-width: 250px;
    }

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

    .secondary-buttons .btn {
        min-width: 200px;
    }
}

/* Books Page Styles */
.books-container {
    padding: 2rem 0;
}

.books-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.books-header h2 {
    margin: 0;
    color: #2d3748;
    font-size: 2rem;
    font-weight: 700;
}

.language-selector {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.language-selector label {
    font-weight: 600;
    color: #4a5568;
    font-size: 0.9rem;
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.book-card {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.15);
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    transition: all 0.3s ease;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.book-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(31, 38, 135, 0.25);
    border-color: rgba(102, 126, 234, 0.3);
}

.book-cover {
    width: 120px;
    height: 160px;
    margin: 0 auto 1rem auto;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.book-cover-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: white;
    border-radius: 8px;
}

.book-difficulty {
    display: inline-block;
    background: rgba(102, 126, 234, 0.1);
    color: #4c51bf;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
    margin-top: 0.5rem;
}

/* Tooltip Styles */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip-content {
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: 12px;
    padding: 1rem;
    box-shadow:
        0 10px 30px rgba(0, 0, 0, 0.15),
        0 4px 12px rgba(102, 126, 234, 0.1);
    z-index: 1000;
    opacity: 1;
    visibility: visible;
    transition: all 0.3s ease;
    min-width: 280px;
    max-width: 350px;
    pointer-events: none;
}

.tooltip:hover .tooltip-content {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-5px);
}

.tooltip-content::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 8px solid transparent;
    border-top-color: rgba(255, 255, 255, 0.98);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.tooltip-header {
    font-size: 0.9rem;
    font-weight: 700;
    color: #2d3748;
    margin-bottom: 0.75rem;
    text-align: center;
    border-bottom: 1px solid rgba(102, 126, 234, 0.15);
    padding-bottom: 0.5rem;
}

.tooltip-stats {
    margin-bottom: 0.75rem;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.4rem;
    font-size: 0.8rem;
}

.stat-label {
    color: #4a5568;
    font-weight: 500;
}

.stat-value {
    color: #2d3748;
    font-weight: 600;
    background: rgba(102, 126, 234, 0.1);
    padding: 0.15rem 0.4rem;
    border-radius: 6px;
    font-size: 0.75rem;
}

.tooltip-categories {
    border-top: 1px solid rgba(102, 126, 234, 0.15);
    padding-top: 0.75rem;
}

.categories-header {
    font-size: 0.8rem;
    font-weight: 600;
    color: #4a5568;
    margin-bottom: 0.4rem;
}

.categories-list {
    font-size: 0.75rem;
    color: #2d3748;
    line-height: 1.4;
}

/* Tooltip Sections */
.tooltip-section {
    margin: 10px 0;
    padding: 8px 0;
    border-top: 1px solid rgba(102, 126, 234, 0.1);
}

.section-header {
    font-size: 0.7rem;
    font-weight: 600;
    color: #4a90e2;
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.section-content {
    font-size: 0.7rem;
    color: #666;
    line-height: 1.3;
}

/* Tooltip Tags */
.tooltip-tags {
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid rgba(102, 126, 234, 0.1);
}

.tooltip-tags .tag {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2px 6px;
    border-radius: 8px;
    font-size: 0.6rem;
    font-weight: 500;
    margin: 2px 2px 0 0;
    text-transform: lowercase;
}

/* Version Badge */
.tooltip-header .version {
    background: rgba(102, 126, 234, 0.2);
    color: #4a90e2;
    padding: 1px 6px;
    border-radius: 8px;
    font-size: 0.6rem;
    font-weight: 500;
    margin-left: 8px;
    vertical-align: middle;
}

.chapter-card {
    position: relative;
}

.chapter-card:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 12px 28px rgba(102, 126, 234, 0.25);
    border-color: rgba(102, 126, 234, 0.4);
}

.book-info h3 {
    margin: 0 0 0.5rem 0;
    color: #2d3748;
    font-size: 1.1rem;
    font-weight: 600;
}

.book-language {
    margin: 0 0 0.5rem 0;
    color: #667eea;
    font-size: 0.85rem;
    font-weight: 500;
    background: rgba(102, 126, 234, 0.1);
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    display: inline-block;
}

.book-description {
    margin: 0;
    color: #6b7280;
    font-size: 0.9rem;
    line-height: 1.4;
}

@media (max-width: 768px) {
    .books-header {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }

    .language-selector {
        justify-content: center;
    }

    .books-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 1.5rem;
    }
}

/* Data Sync Modal Styles */
.sync-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    animation: fadeIn 0.3s ease-out;
}

.sync-modal-content {
    background: white;
    border-radius: 16px;
    width: 90%;
    max-width: 700px;
    max-height: 90vh;
    overflow: hidden;
    box-shadow:
        0 20px 60px rgba(0, 0, 0, 0.3),
        0 8px 24px rgba(102, 126, 234, 0.1);
    animation: slideIn 0.3s ease-out;
}

.sync-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid #eee;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

.sync-modal-header h3 {
    margin: 0;
    font-size: 1.4rem;
}

.close-btn {
    background: none;
    border: none;
    font-size: 2rem;
    color: white;
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background-color 0.3s ease;
}

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

.sync-tabs {
    display: flex;
    background: #f8f9fa;
    border-bottom: 1px solid #eee;
}

.sync-tab {
    flex: 1;
    padding: 1rem;
    border: none;
    background: transparent;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
}

.sync-tab:hover {
    background: rgba(102, 126, 234, 0.1);
}

.sync-tab.active {
    background: white;
    border-bottom-color: #667eea;
    font-weight: 600;
}

.sync-tab-content {
    padding: 2rem;
    max-height: 60vh;
    overflow-y: auto;
}

.import-options {
    display: grid;
    gap: 2rem;
    margin-top: 1.5rem;
}

.import-option {
    padding: 1.5rem;
    border: 2px dashed #ddd;
    border-radius: 12px;
    transition: all 0.3s ease;
}

.import-option:hover {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.05);
}

.import-option h5 {
    margin: 0 0 1rem 0;
    color: #333;
    font-size: 1.1rem;
}

.current-progress-info {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 2rem;
}

.current-progress-info ul {
    margin: 0.5rem 0;
    padding-left: 1.5rem;
}

.current-progress-info li {
    margin-bottom: 0.5rem;
}

.export-note {
    background: rgba(102, 126, 234, 0.1);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin-top: 1.5rem;
    border-left: 4px solid #667eea;
}

.status-overview {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 2rem;
}

.saved-files-list h5 {
    margin-bottom: 1rem;
    color: #333;
}

.saved-file-item {
    background: white;
    border: 1px solid #eee;
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 0.5rem;
}

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

.file-meta {
    font-size: 0.9em;
    color: #666;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@media (max-width: 768px) {
    .sync-modal-content {
        width: 95%;
        margin: 0 1rem;
    }

    .sync-modal-header {
        padding: 1rem 1.5rem;
    }

    .sync-tab-content {
        padding: 1.5rem;
    }

    .import-options {
        gap: 1.5rem;
    }
}

/* Chapters Page Styles */
.chapters-container {
    padding: 2rem 0;
}

.chapters-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.chapters-header h2 {
    margin: 0;
    color: #2d3748;
    font-size: 1.8rem;
    font-weight: 700;
}

.chapters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.chapter-card {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.15);
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    transition: all 0.3s ease;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.chapter-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(31, 38, 135, 0.25);
    border-color: rgba(102, 126, 234, 0.3);
}

.chapter-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    flex-shrink: 0;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.chapter-info {
    flex: 1;
    min-width: 0;
}

.chapter-info h3 {
    margin: 0 0 0.5rem 0;
    color: #2d3748;
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.3;
}

.chapter-description {
    margin: 0 0 1rem 0;
    color: #6b7280;
    font-size: 0.9rem;
    line-height: 1.4;
}

.chapter-meta {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.difficulty-badge {
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: capitalize;
}

.difficulty-beginner {
    background: rgba(34, 197, 94, 0.1);
    color: #059669;
}

.difficulty-intermediate {
    background: rgba(245, 158, 11, 0.1);
    color: #d97706;
}

.difficulty-advanced {
    background: rgba(239, 68, 68, 0.1);
    color: #dc2626;
}

.language-badge {
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
    background: rgba(102, 126, 234, 0.1);
    color: #667eea;
}

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

.chapter-progress .progress {
    flex: 1;
    height: 6px;
    background-color: #e5e7eb;
    border-radius: 3px;
    overflow: hidden;
}

.progress-text {
    font-size: 0.8rem;
    color: #9ca3af;
    font-weight: 500;
    white-space: nowrap;
}

@media (max-width: 768px) {
    .chapters-header {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }

    .chapters-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .chapter-card {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }

    .chapter-number {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }
}

/* Games Page Styles */
.games-container {
    padding: 2rem 0;
}

.games-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.games-header h2 {
    margin: 0;
    color: #2d3748;
    font-size: 1.8rem;
    font-weight: 700;
}

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

.game-card {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.15);
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    transition: all 0.3s ease;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.game-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(31, 38, 135, 0.25);
    border-color: rgba(102, 126, 234, 0.3);
}

.game-icon {
    font-size: 3rem;
    flex-shrink: 0;
}

.game-info {
    flex: 1;
    min-width: 0;
}

.game-info h3 {
    margin: 0 0 0.5rem 0;
    color: #2d3748;
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.3;
}

.game-description {
    margin: 0 0 1rem 0;
    color: #6b7280;
    font-size: 0.9rem;
    line-height: 1.4;
}

.game-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.play-count {
    font-size: 0.8rem;
    color: #9ca3af;
    font-weight: 500;
}

/* Game Container Styles */
.game-container {
    padding: 1rem 0;
}

.game-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.game-header h2 {
    margin: 0;
    color: #2d3748;
    font-size: 1.5rem;
    font-weight: 700;
}

.game-area {
    min-height: 400px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 16px;
    padding: 1rem;
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.15);
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.5);
}

@media (max-width: 768px) {
    .games-header {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }

    .games-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .game-card {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }

    .game-header {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }
}

/* Dynamic Revision System Styles */
.dynamic-revision-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

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

.revision-header h2 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.revision-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.revision-controls {
    background: var(--card-background);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.dropdown-container {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
}

.dropdown-group {
    flex: 1;
}

.dropdown-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
}

.revision-start {
    text-align: center;
}

.btn-disabled {
    opacity: 0.5;
    cursor: not-allowed !important;
    background-color: #cccccc !important;
}

.revision-viewport {
    background: var(--card-background);
    border-radius: 12px;
    padding: 40px;
    min-height: 400px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.viewport-placeholder {
    text-align: center;
    color: var(--text-secondary);
}

.placeholder-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.exercise-types-preview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-top: 30px;
}

.exercise-type {
    padding: 15px;
    background: rgba(var(--primary-color-rgb), 0.1);
    border-radius: 8px;
    font-weight: 500;
}

.chapter-preview {
    text-align: center;
}

.preview-header {
    margin-bottom: 30px;
}

.preview-header h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.exercise-preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.exercise-preview-card {
    background: rgba(var(--primary-color-rgb), 0.05);
    border: 2px solid rgba(var(--primary-color-rgb), 0.1);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    transition: transform 0.2s;
}

.exercise-preview-card:hover {
    transform: translateY(-2px);
    border-color: rgba(var(--primary-color-rgb), 0.3);
}

.exercise-icon {
    font-size: 2rem;
    margin-bottom: 10px;
}

.exercise-preview-card h4 {
    color: var(--primary-color);
    margin-bottom: 8px;
}

.exercise-preview-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.revision-active {
    text-align: center;
}

.revision-status {
    background: rgba(var(--success-color-rgb, 34, 197, 94), 0.1);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 30px;
}

.revision-status h3 {
    color: var(--success-color, #22c55e);
    margin-bottom: 15px;
}

.revision-placeholder {
    padding: 40px;
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    color: var(--text-secondary);
}

.revision-placeholder .loading-spinner {
    font-size: 3rem;
    margin-bottom: 20px;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@media (max-width: 768px) {
    .dropdown-container {
        flex-direction: column;
    }

    .exercise-preview-grid {
        grid-template-columns: 1fr;
    }
}

/* Chapter statistics styling */
.chapter-stats {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin: 15px 0;
    flex-wrap: wrap;
}

.stat {
    background: rgba(var(--primary-color-rgb), 0.1);
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--primary-color);
}

@media (max-width: 768px) {
    .chapter-stats {
        flex-direction: column;
        align-items: center;
    }
}

/* DRS Progress and Mastery UI */
.chapter-title-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.chapter-badges {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.completion-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    background: var(--success-color);
    color: white;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
}

.mastery-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    color: white;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
    animation: mastery-glow 2s ease-in-out infinite alternate;
}

@keyframes mastery-glow {
    0% {
        box-shadow: var(--shadow-sm);
    }
    100% {
        box-shadow: 0 0 20px rgba(251, 191, 36, 0.4), var(--shadow-sm);
    }
}

.chapter-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    justify-content: center;
}

.chapter-actions .btn {
    transition: all 0.2s ease;
}

.chapter-actions .btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-warning {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: white;
    border: none;
}

.btn-warning:hover {
    background: linear-gradient(135deg, #d97706, #b45309);
}

@media (max-width: 768px) {
    .chapter-title-row {
        flex-direction: column;
        text-align: center;
        gap: 0.5rem;
    }

    .chapter-badges {
        justify-content: center;
    }

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

/* =============================================================================
   DYNAMIC REVISION - EXERCISE TYPE & DIFFICULTY SELECTION
   ============================================================================= */

.exercise-type-selection {
    margin: 24px 0;
}

.exercise-type-selection h4 {
    margin: 0 0 16px 0;
    color: #374151;
    font-size: 16px;
    font-weight: 600;
}

.exercise-types {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
}

.exercise-type-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 16px 12px;
    border: 2px solid #e5e7eb;
    border-radius: 12px;
    background: white;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 14px;
    color: #6b7280;
}

.exercise-type-btn:hover {
    border-color: #3b82f6;
    background: #eff6ff;
    color: #1e40af;
}

.exercise-type-btn.active {
    border-color: #10b981;
    background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
    color: #065f46;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.2);
}

.exercise-type-btn .type-icon {
    font-size: 24px;
    margin-bottom: 8px;
}

.exercise-type-btn .type-name {
    font-weight: 500;
}

.difficulty-selection {
    margin: 24px 0;
}

.difficulty-selection h4 {
    margin: 0 0 16px 0;
    color: #374151;
    font-size: 16px;
    font-weight: 600;
}

.difficulty-buttons {
    display: flex;
    gap: 8px;
    justify-content: center;
}

.difficulty-btn {
    padding: 8px 20px;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    background: white;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: #6b7280;
    transition: all 0.2s ease;
    min-width: 80px;
}

.difficulty-btn:hover {
    border-color: #9ca3af;
    background: #f9fafb;
    color: #374151;
}

.difficulty-btn.active {
    border-color: #3b82f6;
    background: #3b82f6;
    color: white;
    box-shadow: 0 2px 4px rgba(59, 130, 246, 0.3);
}

@media (max-width: 768px) {
    .exercise-types {
        grid-template-columns: repeat(2, 1fr);
    }

    .difficulty-buttons {
        flex-wrap: wrap;
    }

    .difficulty-btn {
        flex: 1;
        min-width: 70px;
    }
}

/* =============================================================================
   SMART GUIDE INTERFACE STYLES
   ============================================================================= */

.smart-guide-active {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border-radius: 16px;
    padding: 24px;
    margin: 16px 0;
    border: 2px solid #0ea5e9;
    box-shadow: 0 8px 32px rgba(14, 165, 233, 0.1);
}

.guide-header {
    margin-bottom: 24px;
}

.guide-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.guide-title h3 {
    margin: 0;
    color: #0c4a6e;
    font-size: 1.5em;
    display: flex;
    align-items: center;
    gap: 8px;
}

.guide-status {
    padding: 12px 16px;
    background: rgba(14, 165, 233, 0.1);
    border-radius: 8px;
    border-left: 4px solid #0ea5e9;
    color: #0c4a6e;
    font-weight: 500;
    font-size: 14px;
}

.guide-controls {
    margin-bottom: 24px;
}

.session-progress {
    background: white;
    padding: 16px;
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.progress-bar-container {
    background: #e5e7eb;
    height: 12px;
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 8px;
}

.progress-bar {
    background: linear-gradient(90deg, #0ea5e9 0%, #06b6d4 100%);
    height: 100%;
    transition: width 0.6s ease;
    border-radius: 6px;
}

.progress-text {
    font-size: 14px;
    font-weight: 500;
    color: #374151;
    text-align: center;
}

.current-exercise-info {
    background: white;
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 24px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    border: 1px solid #e5e7eb;
}

.current-exercise-info h4 {
    margin: 0 0 16px 0;
    color: #111827;
    font-size: 1.1em;
}

.exercise-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 12px;
    margin-bottom: 16px;
}

.exercise-detail {
    padding: 8px 12px;
    background: #f8fafc;
    border-radius: 6px;
    font-size: 14px;
}

.exercise-detail strong {
    color: #374151;
}

.reasoning-box {
    background: #fef3c7;
    padding: 16px;
    border-radius: 8px;
    border-left: 4px solid #f59e0b;
    font-size: 14px;
    color: #78350f;
    line-height: 1.5;
}

.reasoning-box strong {
    display: block;
    margin-bottom: 8px;
    color: #92400e;
}

.guide-insights {
    background: white;
    padding: 24px;
    border-radius: 12px;
    margin-top: 24px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #e5e7eb;
}

.guide-insights h4 {
    margin: 0 0 20px 0;
    color: #111827;
    text-align: center;
    font-size: 1.2em;
}

.insights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.insight-card {
    background: #f8fafc;
    padding: 16px;
    border-radius: 8px;
    border: 1px solid #e5e7eb;
}

.insight-card h5 {
    margin: 0 0 12px 0;
    color: #374151;
    font-size: 1em;
    display: flex;
    align-items: center;
    gap: 8px;
}

.insight-card ul {
    margin: 0;
    padding-left: 16px;
    list-style-type: disc;
}

.insight-card li {
    margin-bottom: 6px;
    font-size: 14px;
    color: #6b7280;
}

.insights-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.revision-start {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin: 20px 0;
}

/* Button spacing for revision start section */
.revision-start .btn {
    min-width: 200px;
}

/* Manual mode collapsible section */
.manual-mode {
    margin-top: 16px;
}

.manual-controls {
    background: #f8fafc;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 8px;
}

.manual-controls summary {
    cursor: pointer;
    padding: 8px 12px;
    font-size: 14px;
    color: #6b7280;
    font-weight: 500;
    border-radius: 6px;
    transition: background 0.2s ease;
}

.manual-controls summary:hover {
    background: #e5e7eb;
}

.manual-content {
    padding: 16px 12px 8px 12px;
}

.manual-content h5 {
    font-size: 14px;
    color: #374151;
    margin: 0 0 8px 0;
}

/* Smart Guide specific animations - REMOVED annoying hover animation */

/* Progress bar animation */
@keyframes progressPulse {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(14, 165, 233, 0.4);
    }
    50% {
        box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.1);
    }
}

.progress-bar {
    animation: progressPulse 2s infinite;
}

/* Smart Guide responsive design */
@media (max-width: 768px) {
    .smart-guide-active {
        padding: 16px;
        margin: 12px 0;
    }

    .guide-title {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }

    .guide-title h3 {
        font-size: 1.3em;
    }

    .insights-grid {
        grid-template-columns: 1fr;
    }

    .insights-actions {
        flex-direction: column;
    }

    .revision-start {
        flex-direction: column;
    }

    .revision-start .btn {
        width: 100%;
        min-width: unset;
    }
}

@media (max-width: 480px) {
    .exercise-details {
        grid-template-columns: 1fr;
    }

    .guide-status {
        font-size: 13px;
        padding: 10px 12px;
    }

    .current-exercise-info {
        padding: 16px;
    }
}

/* Vocabulary Knowledge Modal */
.vocabulary-knowledge-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 99999 !important;
    display: flex;
    align-items: center;
    justify-content: center;
}

.vocabulary-knowledge-modal .modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
}

.vocabulary-knowledge-modal .modal-content {
    position: relative;
    background: white;
    border-radius: 12px;
    padding: 24px;
    max-width: 600px;
    max-height: 80vh;
    width: 90%;
    overflow-y: auto;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.vocabulary-knowledge-modal .modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid #f1f5f9;
}

.vocabulary-knowledge-modal .modal-header h2 {
    margin: 0;
    color: #1e293b;
    font-size: 24px;
}

.vocabulary-knowledge-modal .modal-close {
    background: none;
    border: none;
    font-size: 24px;
    color: #64748b;
    cursor: pointer;
    padding: 4px;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.vocabulary-knowledge-modal .modal-close:hover {
    background: #f1f5f9;
    color: #1e293b;
}

.vocabulary-knowledge-modal .knowledge-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.vocabulary-knowledge-modal .stat-card {
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    color: white;
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.vocabulary-knowledge-modal .stat-number {
    font-size: 32px;
    font-weight: bold;
    margin-bottom: 4px;
    display: block;
}

.vocabulary-knowledge-modal .stat-label {
    font-size: 14px;
    opacity: 0.9;
}

.vocabulary-knowledge-modal .mastered-words h3 {
    margin: 0 0 16px 0;
    color: #1e293b;
    font-size: 18px;
}

.vocabulary-knowledge-modal .words-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.vocabulary-knowledge-modal .mastered-word {
    background: #10b981;
    color: white;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    display: inline-block;
}

.vocabulary-knowledge-modal .no-words {
    color: #64748b;
    font-style: italic;
    text-align: center;
    padding: 40px 20px;
    margin: 0;
}

.vocabulary-knowledge-modal .learning-details {
    margin-bottom: 32px;
}

.vocabulary-knowledge-modal .learning-details h3 {
    margin: 0 0 16px 0;
    color: #1e293b;
    font-size: 18px;
}

.vocabulary-knowledge-modal .progress-sections {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.vocabulary-knowledge-modal .progress-section {
    background: #f8fafc;
    padding: 16px;
    border-radius: 8px;
    border-left: 4px solid #3b82f6;
}

.vocabulary-knowledge-modal .progress-section h4 {
    margin: 0 0 8px 0;
    color: #1e293b;
    font-size: 16px;
}

.vocabulary-knowledge-modal .progress-bar {
    background: #e2e8f0;
    height: 8px;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 8px;
}

.vocabulary-knowledge-modal .progress-fill {
    background: linear-gradient(90deg, #10b981, #059669);
    height: 100%;
    transition: width 0.3s ease;
}

.vocabulary-knowledge-modal .progress-section span {
    font-size: 14px;
    color: #64748b;
    font-weight: 500;
}

.guide-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

@media (max-width: 640px) {
    .vocabulary-knowledge-modal .modal-content {
        padding: 20px;
        margin: 16px;
        max-height: calc(100vh - 32px);
    }

    .vocabulary-knowledge-modal .knowledge-stats {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .vocabulary-knowledge-modal .stat-card {
        padding: 16px;
    }

    .vocabulary-knowledge-modal .stat-number {
        font-size: 24px;
    }

    .guide-actions {
        flex-direction: column;
        width: 100%;
    }

    .guide-actions .btn {
        width: 100%;
        margin: 0;
    }
}

/* Word Discovery Module */
.word-discovery {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.word-discovery .discovery-header {
    text-align: center;
    margin-bottom: 32px;
    padding-bottom: 16px;
    border-bottom: 2px solid #e2e8f0;
}

.word-discovery .discovery-header h2 {
    margin: 0 0 16px 0;
    color: #1e293b;
    font-size: 28px;
}

.word-discovery .progress-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.word-discovery .progress-bar {
    width: 100%;
    max-width: 300px;
    height: 8px;
    background: #e2e8f0;
    border-radius: 4px;
    overflow: hidden;
}

.word-discovery .progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #3b82f6, #1d4ed8);
    transition: width 0.3s ease;
}

.word-discovery .word-card {
    background: #f8fafc;
    border-radius: 16px;
    padding: 32px;
    margin: 24px 0;
    text-align: center;
    border: 3px solid #e2e8f0;
    min-height: 400px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.word-discovery .word-card.with-image {
    min-height: 500px;
}

.word-discovery .word-image {
    margin-bottom: 24px;
}

.word-discovery .word-image img {
    max-width: 100%;
    max-height: 200px;
    object-fit: contain;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.word-discovery .word-main {
    margin-bottom: 32px;
}

.word-discovery .word-text {
    font-size: 48px;
    font-weight: bold;
    color: #1e293b;
    margin: 0 0 16px 0;
    text-transform: lowercase;
}

.word-discovery .word-pronunciation {
    font-size: 18px;
    color: #64748b;
    font-style: italic;
    margin-bottom: 8px;
}

.word-discovery .word-details {
    display: grid;
    gap: 24px;
    text-align: left;
}

.word-discovery .word-meaning,
.word-discovery .word-type,
.word-discovery .word-example {
    background: white;
    padding: 16px;
    border-radius: 8px;
    border-left: 4px solid #3b82f6;
}

.word-discovery .word-meaning h3,
.word-discovery .word-type h3,
.word-discovery .word-example h3 {
    margin: 0 0 8px 0;
    color: #3b82f6;
    font-size: 16px;
    font-weight: 600;
}

.word-discovery .word-meaning p,
.word-discovery .word-example p {
    margin: 0;
    font-size: 16px;
    line-height: 1.5;
    color: #374151;
}

.word-discovery .type-badge {
    background: #dbeafe;
    color: #1d4ed8;
    padding: 4px 12px;
    border-radius: 16px;
    font-size: 14px;
    font-weight: 500;
}

.word-discovery .discovery-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 32px 0 16px 0;
    gap: 16px;
}

.word-discovery .discovery-info {
    text-align: center;
    color: #64748b;
    font-size: 14px;
    margin-top: 16px;
}

.word-discovery .discovery-complete {
    text-align: center;
    padding: 40px 20px;
}

.word-discovery .discovery-complete h2 {
    color: #059669;
    margin-bottom: 16px;
}

.word-discovery .discovered-words {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    margin: 24px 0;
}

.word-discovery .discovered-word {
    background: #10b981;
    color: white;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
}

@media (max-width: 768px) {
    .word-discovery {
        padding: 16px;
        margin: 16px;
    }

    .word-discovery .word-text {
        font-size: 36px;
    }

    .word-discovery .word-card {
        padding: 24px 16px;
        min-height: 350px;
    }

    .word-discovery .discovery-controls {
        flex-direction: column;
        gap: 12px;
    }

    .word-discovery .discovery-controls .btn {
        width: 100%;
    }
}