:root {
    /* Color Palette */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --accent: #ec4899;
    --accent-light: #f472b6;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    
    /* Neutrals */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    /* Glass effect */
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(148, 163, 184, 0.1);
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Animated background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(236, 72, 153, 0.1) 0%, transparent 50%);
    animation: bgPulse 15s ease-in-out infinite;
    pointer-events: none;
    z-index: 0;
}

@keyframes bgPulse {
    0%, 100% { opacity: 0.5; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.1); }
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: var(--spacing-xl);
    position: relative;
    z-index: 1;
}

/* Header */
header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    animation: fadeInDown 0.6s ease;
}

header h1 {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 0 30px rgba(99, 102, 241, 0.5);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 300;
}

/* Main Content Layout */
.main-content {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: var(--spacing-xl);
    animation: fadeIn 0.8s ease;
}

/* Canvas Container */
.canvas-container {
    position: relative;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    overflow: hidden;
}

.canvas-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-light), transparent);
    opacity: 0.5;
}

#gameCanvas {
    display: block;
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    background: #000;
    cursor: crosshair;
    box-shadow: inset 0 0 50px rgba(0, 0, 0, 0.8);
    transition: transform var(--transition-fast);
}

#gameCanvas:hover {
    transform: scale(1.002);
}

/* Canvas Overlay Stats */
.canvas-overlay {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    pointer-events: none;
}

.stats {
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    min-width: 200px;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
}

.stat-value {
    color: var(--primary-light);
    font-size: 1.25rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

/* Control Panel */
.control-panel {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.control-section,
.info-section {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.control-section:hover,
.info-section:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.control-section h3,
.info-section h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.control-section h3::before {
    content: '';
    width: 4px;
    height: 1.125rem;
    background: linear-gradient(180deg, var(--primary), var(--accent));
    border-radius: 2px;
}

/* Buttons */
.button-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    font-weight: 500;
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    position: relative;
    overflow: hidden;
}

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

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

.btn .icon {
    font-size: 1rem;
    position: relative;
    z-index: 1;
}

.btn span:not(.icon) {
    position: relative;
    z-index: 1;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-sm), 0 0 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), 0 0 20px rgba(99, 102, 241, 0.6);
}

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

.btn-primary.active {
    background: linear-gradient(135deg, var(--danger), #dc2626);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
    background: var(--bg-secondary);
    border-color: var(--primary-light);
    transform: translateY(-1px);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger), #dc2626);
    color: white;
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), 0 0 20px rgba(239, 68, 68, 0.5);
}

.btn-accent {
    background: linear-gradient(135deg, var(--accent), #db2777);
    color: white;
    box-shadow: var(--shadow-sm), 0 0 15px rgba(236, 72, 153, 0.4);
}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), 0 0 20px rgba(236, 72, 153, 0.6);
}

/* Sliders */
.slider-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.slider-group label {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    font-weight: 500;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--bg-tertiary);
    outline: none;
    -webkit-appearance: none;
    position: relative;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    cursor: pointer;
    box-shadow: var(--shadow-sm), 0 0 10px rgba(99, 102, 241, 0.5);
    transition: all var(--transition-normal);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: var(--shadow-md), 0 0 15px rgba(99, 102, 241, 0.8);
}

.slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border: none;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    cursor: pointer;
    box-shadow: var(--shadow-sm), 0 0 10px rgba(99, 102, 241, 0.5);
    transition: all var(--transition-normal);
}

.slider::-moz-range-thumb:hover {
    transform: scale(1.2);
    box-shadow: var(--shadow-md), 0 0 15px rgba(99, 102, 241, 0.8);
}

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

.pattern-btn {
    padding: var(--spacing-sm);
    background: var(--bg-tertiary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 500;
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.pattern-btn:hover {
    background: var(--bg-secondary);
    border-color: var(--primary-light);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

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

/* Info Section */
.rules-list {
    list-style: none;
    counter-reset: rules-counter;
    margin-bottom: var(--spacing-md);
}

.rules-list li {
    counter-increment: rules-counter;
    padding-left: var(--spacing-lg);
    position: relative;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
}

.rules-list li::before {
    content: counter(rules-counter);
    position: absolute;
    left: 0;
    top: 0;
    width: 24px;
    height: 24px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    color: white;
}

.rules-list strong {
    color: var(--text-primary);
}

.hint {
    color: var(--text-muted);
    font-size: 0.875rem;
    font-style: italic;
    padding: var(--spacing-sm);
    background: rgba(99, 102, 241, 0.1);
    border-left: 3px solid var(--primary);
    border-radius: var(--radius-sm);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* Responsive Design */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 1fr;
    }
    
    .control-panel {
        max-width: 600px;
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 0.9375rem;
    }
    
    .canvas-overlay {
        position: static;
        margin-top: var(--spacing-md);
    }
    
    .stats {
        width: 100%;
    }
    
    .pattern-grid {
        grid-template-columns: 1fr;
    }
}

/* Dark theme enhancement for better contrast */
@media (prefers-color-scheme: dark) {
    body {
        background: linear-gradient(135deg, #0a0f1e 0%, #151b2e 50%, #0a0f1e 100%);
    }
}