* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body, html {
    width: 100%;
    height: 100%;
    overflow: hidden; /* Prevent scrolling */
    background-color: #222;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    touch-action: none; /* Prevent default touch actions like scrolling */
}

#game-container {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

canvas {
    display: block;
    background-color: #000;
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
}

#ui-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none; /* Let clicks pass through to canvas/input handler */
}

#score-board {
    position: absolute;
    top: 10px;
    left: 10px;
    color: #fff;
    font-size: 18px;
    font-weight: bold;
    text-shadow: 1px 1px 2px #000;
    z-index: 10;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: #fff;
    pointer-events: auto; /* Re-enable clicks for buttons/start */
    z-index: 20;
}

.overlay h1 {
    font-size: 48px;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 5px;
    color: #ffcc00;
    text-shadow: 0 0 10px #ffcc00;
}

.overlay p {
    font-size: 24px;
    animation: pulse 1.5s infinite;
}

.hidden {
    display: none !important;
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.5; }
    100% { opacity: 1; }
}