/* Enhanced Word Association Challenge - Web Tools Style CSS */
:root {
  /* Color palette - Enhanced */
  --primary-color: #646cff;
  --primary-hover: #747bff;
  --primary-color-rgb: 100, 108, 255;
  --accent-color: #4ac0ff;
  --accent-hover: #60caff;
  --accent-color-rgb: 74, 192, 255;
  --bg-dark: #0a0a0a;
  --bg-gradient: linear-gradient(135deg, #0a0a0a 0%, #1a1a2e 100%);
  --card-bg: #1a1a1a;
  --card-gradient: linear-gradient(135deg, #1a1a1a 0%, #16213e 100%);
  --text-light: rgba(255, 255, 255, 0.95);
  --text-muted: #888;
  --text-secondary: #a3e0ff;
  --border-color: #333;
  --border-glow: rgba(100, 108, 255, 0.3);
  --success-color: #4CAF50;
  --error-color: #ff6b6b;
  --warning-color: #ffcf33;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-xxl: 3rem;
  
  /* Border radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  
  /* Shadows */
  --shadow-sm: 0 4px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 25px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 15px 35px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(100, 108, 255, 0.3);
  
  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset and base styles */
*, *::before, *::after {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
    line-height: 1.6;
    font-weight: 400;
    color: var(--text-light);
    background: var(--bg-gradient);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 80%, rgba(100, 108, 255, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(74, 192, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* Main game container */
.game-container {
    background: var(--card-gradient);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    width: 100%;
    max-width: 650px;
    text-align: center;
    position: relative;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(20px);
    overflow: hidden;
}

.game-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
    pointer-events: none;
    border-radius: var(--radius-lg);
}

/* Header */
.header {
    margin-bottom: var(--spacing-xl);
    position: relative;
}

h1 {
    font-size: 2.8rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-light);
    line-height: 1.2;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: none;
    position: relative;
}

.subtitle {
    color: var(--text-muted);
    font-size: 1.1rem;
    font-weight: 400;
    opacity: 0.8;
}

/* Difficulty selector */
.difficulty-selector-wrapper {
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.difficulty-label {
    color: var(--text-light);
    font-size: 1rem;
    font-weight: 600;
    white-space: nowrap;
}

.difficulty-selector {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    background: rgba(255, 255, 255, 0.05);
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.difficulty-btn {
    background: transparent;
    border: none;
    color: var(--text-light);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    min-height: 44px;
    min-width: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    -webkit-tap-highlight-color: transparent;
    font-family: inherit;
    position: relative;
    overflow: hidden;
}

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

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

.difficulty-btn:hover,
.difficulty-btn:focus {
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(100, 108, 255, 0.3);
}

.difficulty-btn.active {
    background: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

/* Category selector */
.category-selector {
    margin-bottom: var(--spacing-lg);
}

.category-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.category-label {
    color: var(--text-light);
    font-size: 1rem;
    font-weight: 600;
    white-space: nowrap;
}

.category-selector select {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-light);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    cursor: pointer;
    font-family: inherit;
    font-weight: 500;
    min-width: 200px;
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.category-selector select:hover,
.category-selector select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(var(--primary-color-rgb), 0.2);
    transform: translateY(-1px);
}

/* Statistics */
.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    padding: 0;
}

.stat {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    text-align: center;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.stat::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.stat:hover::before {
    opacity: 1;
}

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

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent-color);
    margin-bottom: var(--spacing-xs);
    background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

/* Timer */
.timer-section {
    margin: var(--spacing-lg) 0;
    display: flex;
    justify-content: center;
}

.timer {
    position: relative;
    width: 100px;
    height: 100px;
}

.timer-circle {
    position: relative;
    width: 100%;
    height: 100%;
}

.timer-svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
}

.timer-bg {
    fill: none;
    stroke: rgba(255, 255, 255, 0.1);
    stroke-width: 4;
}

.timer-progress {
    fill: none;
    stroke: var(--success-color);
    stroke-width: 4;
    stroke-linecap: round;
    stroke-dasharray: 283;
    stroke-dashoffset: 0;
    transition: stroke-dashoffset 1s linear, stroke var(--transition-normal);
    filter: drop-shadow(0 0 8px currentColor);
}

.timer-progress.warning {
    stroke: var(--warning-color);
}

.timer-progress.danger {
    stroke: var(--error-color);
    animation: pulse 0.5s infinite alternate;
}

@keyframes pulse {
    from { opacity: 1; }
    to { opacity: 0.6; }
}

.timer-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--success-color);
    transition: color var(--transition-normal);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.timer-text.warning {
    color: var(--warning-color);
}

.timer-text.danger {
    color: var(--error-color);
}

/* Word card */
.word-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xxl) var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    position: relative;
    backdrop-filter: blur(15px);
    transition: all var(--transition-normal);
}

.word-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(100, 108, 255, 0.3);
}

.word {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-light);
    margin-bottom: var(--spacing-sm);
    word-break: break-word;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.pronunciation {
    font-style: italic;
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.8;
}

/* Options grid */
.options {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.option {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: var(--text-light);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    font-size: 1rem;
    line-height: 1.5;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    font-family: inherit;
    font-weight: 500;
    backdrop-filter: blur(10px);
    overflow: hidden;
}

.option::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.6s;
}

.option:hover::before {
    left: 100%;
}

.option:hover,
.option:focus {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(100, 108, 255, 0.25);
}

.option:active {
    transform: translateY(-1px);
}

.option.correct {
    background: linear-gradient(135deg, var(--success-color), #45a049);
    border-color: var(--success-color);
    color: white;
    box-shadow: 0 8px 25px rgba(76, 175, 80, 0.4);
    animation: correctPulse 0.6s ease;
}

.option.incorrect {
    background: linear-gradient(135deg, var(--error-color), #e55656);
    border-color: var(--error-color);
    color: white;
    box-shadow: 0 8px 25px rgba(255, 107, 107, 0.4);
    animation: incorrectShake 0.5s ease;
}

.option.faded {
    opacity: 0.3;
    border-color: rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
    transform: scale(0.98);
}

@keyframes correctPulse {
    0%, 100% { transform: translateY(-3px) scale(1); }
    50% { transform: translateY(-3px) scale(1.02); }
}

@keyframes incorrectShake {
    0%, 100% { transform: translateY(-3px) translateX(0); }
    25% { transform: translateY(-3px) translateX(-4px); }
    75% { transform: translateY(-3px) translateX(4px); }
}

/* Feedback */
.feedback {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    display: none;
    animation: slideInUp 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: inherit;
    backdrop-filter: blur(15px);
    border: 1px solid transparent;
}

.feedback.show {
    display: block;
}

.feedback.correct {
    background: rgba(76, 175, 80, 0.15);
    border-color: var(--success-color);
    color: var(--success-color);
    box-shadow: 0 4px 20px rgba(76, 175, 80, 0.2);
}

.feedback.incorrect {
    background: rgba(255, 107, 107, 0.15);
    border-color: var(--error-color);
    color: var(--error-color);
    box-shadow: 0 4px 20px rgba(255, 107, 107, 0.2);
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Buttons */
.btn {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    min-height: 50px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    -webkit-tap-highlight-color: transparent;
    box-shadow: var(--shadow-sm);
    font-family: inherit;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transition: width 0.4s, height 0.4s;
    transform: translate(-50%, -50%);
}

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

.btn:hover,
.btn:focus {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

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

.btn.secondary {
    background: linear-gradient(135deg, var(--text-muted), #666);
}

.btn.danger {
    background: linear-gradient(135deg, var(--error-color), #e55656);
}

.btn.success {
    background: linear-gradient(135deg, var(--success-color), #45a049);
}

#nextBtn {
    margin-top: var(--spacing-lg);
    display: none;
}

#playAgainBtn {
    margin-top: var(--spacing-lg);
    display: none;
}

/* Action buttons */
.action-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-xl);
    flex-wrap: wrap;
}

.action-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-light);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    min-height: 44px;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    -webkit-tap-highlight-color: transparent;
    font-family: inherit;
    backdrop-filter: blur(10px);
}

.action-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(100, 108, 255, 0.2);
}

/* Loading indicator */
#loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: none;
    z-index: 1000;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
}

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

/* Game end section */
.game-end {
    text-align: center;
    margin: var(--spacing-xl) 0;
    display: none;
    padding: var(--spacing-xl);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(15px);
}

.game-end.show {
    display: block;
    animation: slideInUp 0.5s ease;
}

.game-end h3 {
    color: var(--text-light);
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.game-end p {
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
    font-size: 1.1rem;
}

/* Notification */
.notification {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(26, 26, 26, 0.95);
    color: var(--text-light);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 500;
    z-index: 1000;
    opacity: 0;
    transform: translateX(-50%) translateY(-20px);
    transition: all var(--transition-normal);
    max-width: calc(100vw - 40px);
    text-align: center;
    font-family: inherit;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(20px);
}

.notification.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.notification.success {
    background: rgba(76, 175, 80, 0.2);
    border-color: var(--success-color);
    color: var(--success-color);
    box-shadow: 0 8px 25px rgba(76, 175, 80, 0.3);
}

.notification.error {
    background: rgba(255, 107, 107, 0.2);
    border-color: var(--error-color);
    color: var(--error-color);
    box-shadow: 0 8px 25px rgba(255, 107, 107, 0.3);
}

.notification.warning {
    background: rgba(255, 207, 51, 0.2);
    border-color: var(--warning-color);
    color: var(--warning-color);
    box-shadow: 0 8px 25px rgba(255, 207, 51, 0.3);
}

.notification.info {
    background: rgba(74, 192, 255, 0.2);
    border-color: var(--accent-color);
    color: var(--accent-color);
    box-shadow: 0 8px 25px rgba(74, 192, 255, 0.3);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
}

.modal-content {
    background: var(--card-gradient);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xxl);
    width: 100%;
    max-width: 500px;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    z-index: 1;
    box-shadow: var(--shadow-lg);
    animation: modalSlideUp 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: inherit;
    backdrop-filter: blur(20px);
}

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

.modal-content h3 {
    margin-bottom: var(--spacing-lg);
    color: var(--text-light);
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.progress-stats {
    margin-bottom: var(--spacing-lg);
}

.stat-group {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    backdrop-filter: blur(10px);
}

.stat-group h4 {
    margin-bottom: var(--spacing-md);
    color: var(--accent-color);
    font-size: 1.2rem;
    font-weight: 600;
}

.stat-group p {
    margin-bottom: var(--spacing-sm);
    font-size: 0.95rem;
    color: var(--text-light);
}

.difficulty-breakdown {
    display: grid;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.difficulty-stat {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(100, 108, 255, 0.15);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    border: 1px solid rgba(100, 108, 255, 0.3);
}

.difficulty-stat .difficulty-name {
    font-weight: 600;
    color: var(--text-light);
}

.difficulty-stat .difficulty-percentage {
    color: var(--accent-color);
    font-weight: 700;
}

.settings-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    flex-wrap: wrap;
}

/* Responsive styles */
@media screen and (min-width: 768px) {
    .game-container {
        max-width: 750px;
        padding: var(--spacing-xxl);
    }
    
    h1 {
        font-size: 3.2rem;
    }
    
    .word {
        font-size: 3rem;
    }
    
    .options {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-lg);
    }
    
    .stats {
        gap: var(--spacing-lg);
    }
    
    .stat-value {
        font-size: 2.2rem;
    }
    
    .action-buttons {
        gap: var(--spacing-md);
    }
    
    .difficulty-selector-wrapper {
        flex-wrap: nowrap;
    }
    
    .category-wrapper {
        flex-wrap: nowrap;
    }
}

@media screen and (min-width: 1024px) {
    .game-container {
        max-width: 850px;
    }
    
    .options {
        gap: var(--spacing-xl);
    }
    
    .option {
        min-height: 80px;
        font-size: 1.05rem;
    }
    
    .modal-content {
        max-width: 600px;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .option:hover,
    .btn:hover {
        transform: none;
    }
    
    .difficulty-btn::before,
    .option::before,
    .btn::before {
        display: none;
    }
}

/* Focus styles for keyboard navigation */
.difficulty-btn:focus,
.option:focus,
.btn:focus,
.action-btn:focus,
.category-selector select:focus {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
    box-shadow: 0 0 0 6px rgba(var(--primary-color-rgb), 0.2);
}

/* Add this CSS to your stylesheet for the category completion modal */

.category-complete {
    max-width: 600px;
    text-align: center;
}

.celebration-header {
    margin-bottom: 2rem;
}

.celebration-header h3 {
    font-size: 2rem;
    color: #4CAF50;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
}

.achievement-badge {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    background: linear-gradient(135deg, #FFD700, #FFA500);
    color: #333;
    padding: 1rem;
    border-radius: 50%;
    width: 120px;
    height: 120px;
    margin: 0 auto;
    box-shadow: 0 8px 16px rgba(255, 215, 0, 0.3);
    animation: celebration-bounce 2s ease-in-out;
}

.badge-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.badge-text {
    font-size: 0.8rem;
    font-weight: bold;
    line-height: 1.2;
    text-align: center;
}

.completion-stats {
    display: flex;
    justify-content: space-around;
    margin: 2rem 0;
    padding: 1rem;
    background: rgba(76, 175, 80, 0.1);
    border-radius: 12px;
    border: 2px solid rgba(76, 175, 80, 0.2);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: bold;
    color: #4CAF50;
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.9rem;
    color: #666;
    font-weight: 500;
}

.progress-message {
    margin: 1.5rem 0;
    padding: 1rem;
    background: rgba(33, 150, 243, 0.1);
    border-radius: 8px;
    border-left: 4px solid #2196F3;
}

.progression-options h4 {
    color: #333;
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
}

.progression-options h5 {
    color: #555;
    margin: 1rem 0 0.5rem 0;
    font-size: 1.1rem;
}

.suggestion-box {
    margin: 1rem 0;
    padding: 1rem;
    border-radius: 8px;
    border: 2px solid #ddd;
}

.suggestion-box.recommended {
    background: linear-gradient(135deg, rgba(255, 193, 7, 0.1), rgba(255, 152, 0, 0.1));
    border-color: #FFC107;
}

.suggestion-reason {
    font-size: 0.9rem;
    color: #666;
    margin-top: 0.5rem;
    font-style: italic;
}

.category-grid,
.difficulty-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 0.75rem;
    margin: 0.75rem 0;
}

.category-choice,
.difficulty-choice {
    padding: 0.75rem;
    border-radius: 8px;
    border: 2px solid #ddd;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.category-choice:hover,
.difficulty-choice:hover {
    border-color: #2196F3;
    background: rgba(33, 150, 243, 0.05);
    transform: translateY(-2px);
}

.category-choice small,
.difficulty-choice small {
    color: #666;
    font-size: 0.8rem;
    margin-top: 0.25rem;
}

.difficulty-choice.easy {
    border-color: #4CAF50;
}

.difficulty-choice.easy:hover {
    border-color: #45a049;
    background: rgba(76, 175, 80, 0.05);
}

.difficulty-choice.medium {
    border-color: #FF9800;
}

.difficulty-choice.medium:hover {
    border-color: #f57c00;
    background: rgba(255, 152, 0, 0.05);
}

.difficulty-choice.hard {
    border-color: #f44336;
}

.difficulty-choice.hard:hover {
    border-color: #d32f2f;
    background: rgba(244, 67, 54, 0.05);
}

.other-options {
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid #eee;
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.other-options .btn {
    min-width: 160px;
}

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

/* Responsive design */
@media (max-width: 768px) {
    .completion-stats {
        flex-direction: column;
        gap: 1rem;
    }
    
    .category-grid,
    .difficulty-grid {
        grid-template-columns: 1fr;
    }
    
    .other-options {
        flex-direction: column;
        align-items: center;
    }
    
    .achievement-badge {
        width: 100px;
        height: 100px;
    }
    
    .badge-icon {
        font-size: 2rem;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #555;
        --text-muted: #bbb;
    }
    
    .game-container {
        border-width: 2px;
    }
    
    .option {
        border-width: 2px;
    }
    
    .btn {
        border: 2px solid transparent;
    }
}

/* Screen reader only content */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Touch target improvements */
@supports (-webkit-touch-callout: none) {
    .option,
    .btn,
    .difficulty-btn,
    .action-btn {
        -webkit-touch-callout: none;
        -webkit-user-select: none;
        user-select: none;
    }
}

/* Safe area support for modern devices */
@supports (padding: max(0px)) {
    .game-container {
        padding-left: max(var(--spacing-xl), env(safe-area-inset-left));
        padding-right: max(var(--spacing-xl), env(safe-area-inset-right));
    }
    
    .notification {
        top: max(20px, env(safe-area-inset-top));
    }
}

/* Custom scrollbar for webkit browsers */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, var(--primary-hover), var(--accent-hover));
}