body {
    background-color: #1a1a1a;
    color: #ffffff;
    font-family: 'Arial', sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
    text-align: center;
}

h1 {
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 2px;
}

#game-container {
    position: relative;
    border: 3px solid #fff;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.5);
}

canvas {
    display: block;
    background-color: #333;
    background-image: 
        linear-gradient(rgba(255,255,255,.07) 2px, transparent 2px),
        linear-gradient(90deg, rgba(255,255,255,.07) 2px, transparent 2px),
        linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
    background-size: 100px 100px, 100px 100px, 20px 20px, 20px 20px;
    background-position:-2px -2px, -2px -2px, -1px -1px, -1px -1px;
}

#ui-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none; /* Allow clicks to pass through to canvas if needed */
}

#start-screen, #game-over-screen {
    background-color: rgba(0, 0, 0, 0.8);
    padding: 30px;
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    pointer-events: all; /* Capture clicks on UI elements */
    border: 2px solid #fff;
}

.hidden {
    display: none !important;
}

button {
    margin-top: 20px;
    padding: 10px 20px;
    font-size: 1.2em;
    cursor: pointer;
    background-color: #ff4500;
    border: none;
    color: white;
    border-radius: 5px;
    text-transform: uppercase;
    transition: background-color 0.3s, transform 0.1s;
}

button:hover {
    background-color: #ff6347;
}

button:active {
    transform: scale(0.95);
}

#score-display {
    position: absolute;
    top: 10px;
    left: 10px;
    font-size: 1.5em;
    background-color: rgba(0,0,0,0.5);
    padding: 5px 10px;
    border-radius: 5px;
}

#game-over-screen p {
    font-size: 1.2em;
    margin: 10px 0;
}