/* ===================================
   Dual N-Back Training - Styles
   Modern dark theme with glassmorphism
   =================================== */

:root {
    /* Colors */
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-card: rgba(22, 27, 34, 0.8);
    
    --accent-primary: #00bfa5;
    --accent-secondary: #00897b;
    --accent-glow: rgba(0, 191, 165, 0.3);
    
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    
    --success: #3fb950;
    --warning: #d29922;
    --error: #f85149;
    --info: #58a6ff;
    
    --border-color: rgba(48, 54, 61, 0.8);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Grid */
    --grid-size: min(350px, 80vw);
    --cell-gap: 8px;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
    overflow-x: hidden;
}

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    margin-bottom: var(--spacing-lg);
}

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

.logo {
    width: 40px;
    height: 40px;
    color: var(--accent-primary);
}

.logo-icon {
    width: 100%;
    height: 100%;
}

.header-title h1 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.demo-btn {
    font-size: 0.75rem;
    padding: 4px 10px;
    background: transparent;
    border: 1px solid var(--accent-primary);
    color: var(--accent-primary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
}

.demo-btn:hover {
    background: var(--accent-primary);
    color: var(--bg-primary);
}

.demo-btn.active {
    background: var(--accent-primary);
    color: var(--bg-primary);
}

.trial-counter {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    flex: 1;
}

@media (min-width: 900px) {
    .main-content {
        grid-template-columns: 1fr 350px;
    }
}

/* Game Panel */
.game-panel {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
}

/* Type Selector */
.type-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    justify-content: center;
}

.type-selector span {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.type-btn {
    padding: 8px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--accent-primary);
    color: var(--accent-primary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition-fast);
    text-decoration: underline;
}

.type-btn:hover {
    background: var(--accent-primary);
    color: var(--bg-primary);
}

.nback-input {
    width: 60px;
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    text-align: center;
}

.nback-input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

/* Game Grid */
.game-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--cell-gap);
    width: var(--grid-size);
    height: var(--grid-size);
    background: var(--bg-tertiary);
    padding: var(--cell-gap);
    border-radius: var(--radius-md);
    border: 2px solid var(--border-color);
}

.grid-cell {
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    transition: var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.grid-cell.active {
    background: var(--accent-primary);
    box-shadow: 0 0 30px var(--accent-glow), inset 0 0 20px rgba(255, 255, 255, 0.1);
    animation: pulse 0.3s ease;
}

.grid-cell.active::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 50%);
}

@keyframes pulse {
    0% { transform: scale(0.95); }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); }
}

/* Shapes in cells */
.grid-cell .shape {
    width: 60%;
    height: 60%;
}

.grid-cell .shape.circle {
    border-radius: 50%;
    background: currentColor;
}

.grid-cell .shape.square {
    border-radius: 4px;
    background: currentColor;
}

.grid-cell .shape.triangle {
    width: 0;
    height: 0;
    border-left: 30px solid transparent;
    border-right: 30px solid transparent;
    border-bottom: 52px solid currentColor;
    background: transparent;
}

.grid-cell .shape.diamond {
    width: 45%;
    height: 45%;
    background: currentColor;
    transform: rotate(45deg);
}

.grid-cell .shape.star {
    background: currentColor;
    clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%);
}

/* Control Buttons */
.control-buttons {
    display: flex;
    gap: var(--spacing-md);
    width: 100%;
    max-width: var(--grid-size);
}

.extra-buttons {
    display: flex;
    gap: var(--spacing-md);
    width: 100%;
    max-width: var(--grid-size);
    justify-content: center;
}

.match-btn {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    min-height: 70px;
}

.match-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.match-btn:not(:disabled):hover {
    border-color: var(--accent-primary);
    background: rgba(0, 191, 165, 0.1);
}

.match-btn:not(:disabled):active,
.match-btn.pressed {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: var(--bg-primary);
    transform: scale(0.98);
}

.match-btn.correct {
    background: var(--success);
    border-color: var(--success);
    animation: flash-success 0.3s ease;
}

.match-btn.incorrect {
    background: var(--error);
    border-color: var(--error);
    animation: flash-error 0.3s ease;
}

@keyframes flash-success {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

@keyframes flash-error {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.btn-icon {
    font-size: 1.5rem;
}

.btn-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.match-btn:not(:disabled):active .btn-label,
.match-btn.pressed .btn-label {
    color: var(--bg-primary);
}

/* Game Controls */
.game-controls {
    width: 100%;
    max-width: var(--grid-size);
}

.start-btn {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-xl);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    box-shadow: 0 4px 20px var(--accent-glow);
}

.start-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px var(--accent-glow);
}

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

.start-btn.running {
    background: linear-gradient(135deg, var(--error), #c62828);
    box-shadow: 0 4px 20px rgba(248, 81, 73, 0.3);
}

.start-icon {
    font-size: 1.25rem;
}

/* Last Set Stats */
.last-set {
    width: 100%;
    max-width: var(--grid-size);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.last-set h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.last-set-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
    text-align: center;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.stat-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.success-rate {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    font-size: 0.875rem;
}

.rate-value {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--accent-primary);
}

/* Stats Panel */
.stats-panel {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.config-section,
.stats-section,
.chart-section,
.advanced-section,
.reset-section {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: var(--spacing-md);
}

.config-section h3,
.stats-section h3,
.chart-section h3,
.advanced-section h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

/* Config Grid */
.config-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}

.config-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
}

.config-item label {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.config-item span {
    font-weight: 600;
    color: var(--text-primary);
}

.config-item input,
.config-item select {
    width: 70px;
    padding: 4px 8px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.875rem;
    text-align: center;
}

.config-item input:focus,
.config-item select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
}

.stat-box {
    text-align: center;
    padding: var(--spacing-sm);
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
}

.stat-number {
    display: block;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent-primary);
}

.stat-desc {
    font-size: 0.625rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

/* Stats Details */
.stats-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.detail-row {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-xs) 0;
    font-size: 0.875rem;
}

.detail-row span:first-child {
    color: var(--text-secondary);
}

.detail-row .highlight {
    color: var(--warning);
    font-weight: 600;
}

.detail-row .highlight-blue {
    color: var(--info);
    font-weight: 600;
}

/* Chart */
.chart-container {
    height: 120px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm);
}

#performanceChart {
    width: 100%;
    height: 100%;
}

/* Advanced Settings */
.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-color);
}

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

.setting-item label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.setting-item input {
    width: 80px;
    padding: 6px 10px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    text-align: center;
}

.toggle-group {
    display: flex;
    gap: 2px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    padding: 2px;
}

.toggle-btn {
    padding: 6px 12px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.toggle-btn.active {
    background: var(--accent-primary);
    color: var(--bg-primary);
}

/* Reset Button */
.reset-btn {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--error);
    color: var(--error);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.reset-btn:hover {
    background: var(--error);
    color: white;
}

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

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

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    width: 90%;
    max-width: 400px;
    transform: scale(0.9);
    transition: var(--transition-normal);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.type-options {
    margin-bottom: var(--spacing-lg);
}

.type-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.type-checkbox {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
}

.type-checkbox:hover {
    background: rgba(0, 191, 165, 0.1);
}

.type-checkbox input {
    width: 18px;
    height: 18px;
    accent-color: var(--accent-primary);
}

.type-checkbox span {
    font-size: 0.9rem;
    color: var(--text-primary);
}

.async-options {
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.selected-type {
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
}

.selected-type strong {
    color: var(--accent-primary);
}

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

.modal-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.cancel-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

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

.save-btn {
    background: var(--accent-primary);
    border: none;
    color: var(--bg-primary);
}

.save-btn:hover {
    background: var(--accent-secondary);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9rem;
    box-shadow: var(--shadow);
    transition: var(--transition-normal);
    z-index: 1001;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

.toast.success {
    border-color: var(--success);
    background: rgba(63, 185, 80, 0.2);
}

.toast.error {
    border-color: var(--error);
    background: rgba(248, 81, 73, 0.2);
}

/* Mobile Optimizations */
@media (max-width: 600px) {
    :root {
        --grid-size: min(300px, 85vw);
    }
    
    .app-container {
        padding: var(--spacing-sm);
    }
    
    .header {
        padding: var(--spacing-sm) var(--spacing-md);
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }
    
    .header-title h1 {
        font-size: 1rem;
    }
    
    .main-content {
        gap: var(--spacing-md);
    }
    
    .game-panel {
        padding: var(--spacing-md);
        gap: var(--spacing-md);
    }
    
    .match-btn {
        padding: var(--spacing-sm) var(--spacing-md);
        min-height: 60px;
    }
    
    .btn-icon {
        font-size: 1.25rem;
    }
    
    .stats-panel {
        order: 2;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .config-grid {
        grid-template-columns: 1fr;
    }
}

/* Touch feedback for mobile */
@media (hover: none) {
    .match-btn:active {
        transform: scale(0.95);
    }
    
    .start-btn:active {
        transform: scale(0.98);
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus states for accessibility */
button:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}