body {
    margin: 0;
    padding: 0;
    background: #222;
    overflow: hidden;
    color: white;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    user-select: none;
    -webkit-user-select: none;
    touch-action: none;
}

svg {
    width: 100vw;
    height: 100vh;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
    touch-action: none;
}

#ui-container {
    position: absolute;
    top: 20px;
    left: 20px;
    right: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 10;
    pointer-events: none;
}

#score-board, #level-board {
    font-size: 24px;
    font-weight: bold;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
    background: rgba(255, 255, 255, 0.1);
    padding: 10px 20px;
    border-radius: 8px;
    backdrop-filter: blur(5px);
}

#instruction {
    font-size: 18px;
    opacity: 0.7;
    position: absolute;
    top: 60px;
    left: 50%;
    transform: translateX(-50%);
    text-shadow: 1px 1px 2px rgba(0,0,0,0.8);
}

@media (max-width: 768px) {
    #score-board, #level-board {
        font-size: 18px;
        padding: 6px 12px;
    }
    #instruction {
        font-size: 14px;
        top: 50px;
    }
}