.ffm-container {
    position: fixed;
    z-index: 9999;
    cursor: move;
    user-select: none;
    touch-action: none;
}
.ffm-main-icon-wrapper {
    position: relative;
    display: inline-block;
}
.ffm-main-icon {
    display: block;
    transition: transform 0.3s ease;
}
.ffm-main-icon:hover {
    transform: scale(1.05);
}
.ffm-main-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 50%;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
}
.ffm-sub-icons-wrapper {
    position: absolute;
    top: 0;
    left: 0;
    visibility: hidden;
    opacity: 0;
    transition: visibility 0.3s, opacity 0.3s;
}
.ffm-container.ffm-expanded .ffm-sub-icons-wrapper {
    visibility: visible;
    opacity: 1;
}
.ffm-sub-icon-item {
    position: absolute;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    opacity: 0;
    transform: scale(0);
}
.ffm-container.ffm-expanded .ffm-sub-icon-item {
    opacity: 1;
    transform: scale(1);
}
.ffm-sub-icon {
    display: block;
    transition: transform 0.2s ease;
}
.ffm-sub-icon:hover {
    transform: scale(1.1);
}
/* 仅被点击的子图标有反馈，其他图标不受影响 */
.ffm-sub-icon.ffm-tap-active {
    transform: scale(0.95);
    transition: transform 0.05s;
}
.ffm-main-icon:active {
    transform: scale(0.95);
}
.ffm-sub-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 50%;
    box-shadow: 0 2px 5px rgba(0,0,0,0.15);
    background-color: #fff;
}
@media (max-width: 768px) {
    .ffm-container { cursor: pointer; }
    .ffm-sub-icon-item { transition: all 0.2s cubic-bezier(0.68,-0.55,0.265,1.55); }
}
.ffm-container.ffm-dragging {
    cursor: grabbing;
    transition: none;
}
.ffm-container.ffm-dragging .ffm-sub-icons-wrapper {
    visibility: hidden;
    opacity: 0;
}
.ffm-main-icon:focus-visible,
.ffm-sub-icon:focus-visible {
    outline: 2px solid #007cba;
    outline-offset: 2px;
}