@import url('https://fonts.googleapis.com/css2?family=Roboto+Mono:wght@400;700&display=swap');

body {
    font-family: 'Roboto Mono', monospace;
    background: #121212;
    color: #eee;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow: hidden;
}

canvas {
    display: block;
    background: linear-gradient(to bottom, #1f1f1f, #121212);
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
    image-rendering: pixelated;
}

#ui-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 10;
}

.overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0,0,0,0.8);
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    pointer-events: auto;
    border: 2px solid #444;
}

.btn {
    background: #4CAF50;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    font-size: 1.2rem;
    cursor: pointer;
    margin-top: 1rem;
    transition: background 0.2s;
    font-family: inherit;
}

.btn:hover {
    background: #45a049;
}

.btn:active {
    transform: scale(0.98);
}