body {
    margin: 0;
    overflow: hidden;
    touch-action: none;
}

@media (max-width: 360px) {
    body {
        font-size: 12px;
    }
}

@media (min-width: 361px) and (max-width: 720px) {
    body {
        font-size: 14px;
    }
}

@media (min-width: 721px) and (max-width: 1080px) {
    body {
        font-size: 16px;
    }
}

@media (min-width: 1081px) and (max-width: 1440px) {
    body {
        font-size: 18px;
    }
}

@media (min-width: 1441px) {
    body {
        font-size: 20px;
    }
}

#hud {
    position: absolute;
    top: 10px;
    left: 10px;
    color: white;
    font-family: Arial, sans-serif;
    font-size: 18px;
    background: rgba(0, 0, 0, 0.5);
    padding: 10px 15px;
    border-radius: 8px;
    z-index: 10;
    user-select: none;
}

#mobile-controls {
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 20px;
    z-index: 10;
    user-select: none;
}

.control-button {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 36px;
    color: white;
    cursor: pointer;
    transition: background 0.3s;
    touch-action: none;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}

.control-button:active {
    background: rgba(255, 255, 255, 0.6);
    user-select: none;
}

#back-button {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(0, 0, 0, 0.5);
    color: white;
    font-family: Arial, sans-serif;
    font-size: 16px;
    padding: 8px 12px;
    border-radius: 6px;
    text-decoration: none;
    z-index: 10;
    user-select: none;
    transition: background 0.3s;
}

#back-button:hover {
    background: rgba(0, 0, 0, 0.8);
    user-select: none;
}