.float-nav {
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 999;
    background-color: #ff0000;
    border-radius: 5px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.float-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 15px;
    position: relative;
    cursor: pointer;
    border-bottom: 1px solid rgba(255,255,255,0.2);
    transition: background-color 0.3s ease;
}

.float-nav-item:last-child {
    border-bottom: none;
}

.float-nav-item:hover {
    background-color: #0066cc;
}

.float-nav-item .nav-icon {
    width: 24px;
    height: 24px;
    margin-bottom: 5px;
    filter: brightness(0) invert(1);  /* 使图标变为白色 */
}

.float-nav-item .popup {
    position: absolute;
    right: 100%;
    top: 50%;
    transform: translateY(-50%);
    background: #0066cc;
    color: #ffffff;
    padding: 15px;
    border-radius: 4px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    display: none;
    white-space: nowrap;
    margin-right: 10px;
    font-size: 14px;
}

.float-nav-item:hover .popup {
    display: block;
}

.float-nav-item .popup p {
    margin: 0;
    color: #ffffff;
}

.float-nav-item .popup img {
    max-width: 120px;
    height: auto;
    border: 4px solid #ffffff;
    border-radius: 2px;
}