/* Conway's Game of Life - Premium UI */
* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

:root {
    /* Default Theme */
    --primary-color: #4f46e5;
    --secondary-color: #7c3aed;
    --accent-color: #06b6d4;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-overlay: rgba(15, 23, 42, 0.8);
    
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-accent: #0f172a;
    
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    --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);
    
    --cell-bg: #ffffff;
    --cell-border: #e2e8f0;
    --cell-active: #4f46e5;
    --cell-hover: #f1f5f9;
    
    --border-radius: 8px;
    --border-radius-sm: 6px;
    --border-radius-lg: 12px;
    --cell-gap: 1px;
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-overlay: rgba(0, 0, 0, 0.8);
    
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-accent: #ffffff;
    
    --border-color: #334155;
    --border-hover: #475569;
    
    --cell-bg: #1e293b;
    --cell-border: #334155;
    --cell-active: #6366f1;
    --cell-hover: #334155;
}

/* Neon Theme */
[data-theme="neon"] {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --bg-overlay: rgba(0, 0, 0, 0.9);
    
    --text-primary: #00ff88;
    --text-secondary: #88ffaa;
    --text-accent: #ffffff;
    
    --border-color: #00ff88;
    --border-hover: #88ffaa;
    
    --cell-bg: #1a1a1a;
    --cell-border: #00ff88;
    --cell-active: #00ff88;
    --cell-hover: #2a2a2a;
    
    --primary-color: #00ff88;
    --secondary-color: #ff0088;
    --accent-color: #0088ff;
}

/* Ocean Theme */
[data-theme="ocean"] {
    --bg-primary: #0c4a6e;
    --bg-secondary: #075985;
    --bg-tertiary: #0369a1;
    --bg-overlay: rgba(12, 74, 110, 0.8);
    
    --text-primary: #e0f2fe;
    --text-secondary: #b3e5fc;
    --text-accent: #ffffff;
    
    --border-color: #0284c7;
    --border-hover: #0ea5e9;
    
    --cell-bg: #075985;
    --cell-border: #0284c7;
    --cell-active: #06b6d4;
    --cell-hover: #0369a1;
    
    --primary-color: #06b6d4;
    --secondary-color: #0284c7;
    --accent-color: #38bdf8;
}

body {
    font-family: var(--font-family);
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    color: var(--text-primary);
    min-height: 100vh;
    transition: var(--transition);
}

.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    padding: 1.5rem 2rem;
    transition: var(--transition);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
}

.title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-accent);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.title i {
    color: var(--primary-color);
    font-size: 1.75rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 400;
}

/* Main Content */
.main-content {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 2rem;
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* Game Section */
.game-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.game-container {
    position: relative;
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    padding: 2rem;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.container {
    display: grid;
    gap: var(--cell-gap);
    padding: 1rem;
    border-radius: var(--border-radius);
    background: var(--bg-tertiary);
    aspect-ratio: 1 / 1;
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
    box-shadow: inset var(--shadow-md);
}

.cell {
    aspect-ratio: 1 / 1;
    background: var(--cell-bg);
    border: 1px solid var(--cell-border);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.cell:hover {
    background: var(--cell-hover);
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
    border-color: var(--border-hover);
}

.cell_active {
    background: var(--cell-active);
    box-shadow: 0 0 20px rgba(79, 70, 229, 0.4);
    transform: scale(1.02);
    border-color: var(--cell-active);
}

[data-theme="neon"] .cell_active {
    box-shadow: 0 0 20px var(--cell-active), inset 0 0 10px rgba(0, 255, 136, 0.3);
    animation: neonPulse 2s ease-in-out infinite alternate;
}

@keyframes neonPulse {
    from {
        box-shadow: 0 0 20px var(--cell-active), inset 0 0 10px rgba(0, 255, 136, 0.3);
    }
    to {
        box-shadow: 0 0 30px var(--cell-active), 0 0 40px var(--cell-active), inset 0 0 15px rgba(0, 255, 136, 0.5);
    }
}

/* Game Overlay */
.game-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-lg);
    backdrop-filter: blur(10px);
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
}

.game-overlay.show {
    opacity: 1;
    visibility: visible;
}

.overlay-content {
    text-align: center;
    color: var(--text-accent);
}

.overlay-content i {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.overlay-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

/* Controls */
.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-primary);
    padding: 1.5rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 1rem;
}

.control-group {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-family);
    font-size: 0.9rem;
    box-shadow: var(--shadow-sm);
}

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

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

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: color-mix(in srgb, var(--primary-color) 90%, black);
}

.btn-secondary {
    background: var(--text-secondary);
    color: white;
}

.btn-secondary:hover {
    background: color-mix(in srgb, var(--text-secondary) 90%, black);
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background: color-mix(in srgb, var(--danger-color) 90%, black);
}

.btn-info {
    background: var(--accent-color);
    color: white;
}

.btn-info:hover {
    background: color-mix(in srgb, var(--accent-color) 90%, black);
}

/* Stats */
.stats {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
    font-weight: 500;
}

.stat span {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
}

/* Sidebar */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.panel {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.panel h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    font-size: 1.1rem;
    color: var(--text-accent);
}

.panel h3 i {
    color: var(--primary-color);
}

/* Controls */
.control {
    margin-bottom: 1rem;
}

.control:last-child {
    margin-bottom: 0;
}

.control label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.control select,
.control input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-family: var(--font-family);
    transition: var(--transition);
}

.control select:focus,
.control input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.range-value {
    display: block;
    text-align: center;
    margin-top: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Theme Grid */
.theme-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.theme-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--bg-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.theme-btn:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.theme-btn.active {
    border-color: var(--primary-color);
    background: color-mix(in srgb, var(--primary-color) 10%, var(--bg-secondary));
}

.theme-preview {
    width: 30px;
    height: 20px;
    border-radius: 4px;
    position: relative;
    overflow: hidden;
}

.theme-preview.default {
    background: linear-gradient(45deg, #4f46e5 50%, #ffffff 50%);
}

.theme-preview.dark {
    background: linear-gradient(45deg, #6366f1 50%, #1e293b 50%);
}

.theme-preview.neon {
    background: linear-gradient(45deg, #00ff88 50%, #0a0a0a 50%);
}

.theme-preview.ocean {
    background: linear-gradient(45deg, #06b6d4 50%, #0c4a6e 50%);
}

.theme-btn span {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-primary);
}

/* Pattern List */
.pattern-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.pattern-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--bg-secondary);
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 0.9rem;
}

.pattern-btn:hover {
    border-color: var(--primary-color);
    background: color-mix(in srgb, var(--primary-color) 10%, var(--bg-secondary));
    transform: translateX(4px);
}

.pattern-btn i {
    color: var(--primary-color);
    width: 16px;
}

/* About Text */
.about-text {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .sidebar {
        order: -1;
    }
}

@media (max-width: 768px) {
    .header {
        padding: 1rem;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .title {
        font-size: 1.5rem;
    }
    
    .controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .control-group {
        justify-content: center;
    }
    
    .stats {
        justify-content: space-around;
    }
    
    .theme-grid {
        grid-template-columns: 1fr;
    }
}

/* Loading Animation */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.loading .cell {
    animation: pulse 1.5s ease-in-out infinite;
}

/* Smooth cell transitions */
.cell {
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}