* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: linear-gradient(180deg, #87CEEB 0%, #E0F8E0 100%);
    touch-action: none;
    user-select: none;
}
.animal {
    position: fixed;
    pointer-events: none;
    transition: opacity 0.8s ease;
    z-index: 10;
}
.animal.fading {
    opacity: 0;
}
#shimada-logo {
    position: fixed;
    bottom: 16px;
    right: 16px;
    z-index: 100;
    width: 180px;
    opacity: 0.8;
    pointer-events: none;
    /* タップを透過させる */
}
#audioCtrl {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 100;
    background: rgba(255, 255, 255, 0.6);
    padding: 0.4rem 0.9rem;
    border-radius: 30px;
    box-shadow: 0 1px 8px rgba(0, 0, 0, 0.15);
}
#muteBtn {
    background: none;
    border: none;
    font-size: 1.6rem;
    cursor: pointer;
    line-height: 1;
    padding: 0;
}