body {
    margin: 0;
    overflow: hidden;
    font-family: 'Courier New', Courier, monospace;
    background-color: #000;
}

canvas {
    display: block;
}

#hud {
    position: absolute;
    top: 20px;
    left: 20px;
    color: white;
    font-size: 18px;
    text-shadow: 1px 1px 2px black;
    pointer-events: none;
    z-index: 10;
}

#speed,
#altitude,
#score,
#coordinates {
    margin-bottom: 10px;
    font-weight: bold;
}

#hud div {
    margin-bottom: 10px;
    font-size: 18px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.8);
}

#coordinates {
    font-size: 14px;
    color: #00ff00;
}

#score {
    font-size: 24px;
    color: yellow;
}

#controls-hint {
    position: fixed;
    bottom: 20px;
    left: 0;
    width: 100%;
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    pointer-events: none;
    z-index: 10;
}

#flash {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: white;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.1s ease-out;
    z-index: 100;
}

.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
    z-index: 50;
}

button {
    padding: 15px 30px;
    font-size: 20px;
    margin: 10px;
    cursor: pointer;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
}

button:hover {
    background-color: #45a049;
}