:root {
    --primary-50: #f0f9ff;
    --primary-100: #e0f2fe;
    --primary-200: #bae6fd;
    --primary-300: #7dd3fc;
    --primary-400: #38bdf8;
    --primary-500: #0ea5e9;
    --primary-600: #0284c7;
    --primary-700: #0369a1;
    --primary-800: #075985;
    --primary-900: #0c4a6e;
    --nav-bg: #1e293b;
    --footer-bg: #1e293b;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: #f8fafc;
    color: #1e293b;
}

#game-board {
    display: grid;
    grid-template-columns: repeat(var(--cols), minmax(0, 1fr));
}

.tile {
    aspect-ratio: 1;
    border-radius: 0.25rem;
    cursor: pointer;
    transition: transform 0.2s, opacity 0.2s;
}

.tile:hover {
    transform: scale(1.05);
}

.tile.selected {
    transform: scale(1.1);
    box-shadow: 0 0 0 2px var(--primary-500);
}

.tile.matched {
    opacity: 0;
    pointer-events: none;
}