:root {
    --bg-color: #0d0d12;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-color: #f1f1f1;
    --accent-color: #6366f1;
    --accent-hover: #818cf8;
    --secondary-color: #334155;
    --cell-surviving: #3b82f6; /* Blue */
    --cell-born: #22c55e;      /* Green */
    --cell-dying: #ef4444;     /* Red */
    --cell-shortlived: #eab308; /* Yellow */
    --font-main: 'Outfit', sans-serif;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow: hidden;
}

.app-container {
    width: 100%;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem;
    box-sizing: border-box;
    overflow-y: auto;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 600;
    margin: 0;
    letter-spacing: -1px;
}

h1 span {
    color: var(--accent-color);
    text-shadow: 0 0 20px rgba(99, 102, 241, 0.4);
}

.subtitle {
    opacity: 0.6;
    font-weight: 300;
    margin-top: 0.5rem;
}

.canvas-wrapper {
    position: relative;
    width: 100%;
    max-width: 1200px;
    height: 60vh;
    border-radius: 20px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

canvas {
    cursor: crosshair;
}

.controls-panel {
    margin-top: 2rem;
    background: rgba(15, 15, 20, 0.8);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    padding: 1.5rem 2.5rem;
    border-radius: 100px;
    display: flex;
    gap: 2rem;
    align-items: center;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    z-index: 10;
    transition: all 0.3s ease;
}

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

button {
    font-family: inherit;
    font-weight: 500;
    border: none;
    border-radius: 50px;
    padding: 0.6rem 1.2rem;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.primary-btn {
    background: var(--accent-color);
    color: white;
    min-width: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.primary-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
}

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

.secondary-btn:hover {
    background: #475569;
    transform: translateY(-2px);
}

.slider-group {
    display: flex;
    gap: 1.5rem;
    border-left: 1px solid var(--glass-border);
    padding-left: 1.5rem;
}

.slider-item {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

label {
    font-size: 0.75rem;
    text-transform: uppercase;
    font-weight: 600;
    opacity: 0.5;
    letter-spacing: 0.5px;
}

input[type="range"] {
    appearance: none;
    background: var(--secondary-color);
    height: 4px;
    border-radius: 5px;
    width: 100px;
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 12px;
    height: 12px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
}

.stats {
    display: flex;
    flex-direction: column;
    font-variant-numeric: tabular-nums;
    font-size: 0.85rem;
    opacity: 0.8;
    min-width: 120px;
    border-left: 1px solid var(--glass-border);
    padding-left: 1.5rem;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-left: 1px solid var(--glass-border);
    padding-left: 1.5rem;
    white-space: nowrap;
}

.checkbox-group label {
    cursor: pointer;
    opacity: 0.8;
}

input[type="checkbox"] {
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--secondary-color);
    border-radius: 4px;
    cursor: pointer;
    position: relative;
    transition: all 0.2s ease;
    border: 1px solid var(--glass-border);
}

input[type="checkbox"]:checked {
    background: var(--accent-color);
    border-color: var(--accent-hover);
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.4);
}

input[type="checkbox"]:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 12px;
    font-weight: 600;
}

footer {
    margin-top: 2rem;
    opacity: 0.4;
    font-size: 0.9rem;
    font-weight: 300;
}

/* Animations */
@keyframes pulse {
    0% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.8; }
    100% { transform: scale(1); opacity: 1; }
}

#genCount, #popCount {
    font-weight: 600;
    color: var(--accent-color);
}