/* 右侧竖条：返回顶部 + 到底部（极简稳定版） */
#zrBar {
    position: fixed;
    right: 16px;
    bottom: 90px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 2147483647;
}

#zrBar .zrBtn {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: #6f9f9a;
    color: #fff;
    font-size: 22px;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0.85;
    user-select: none;
}

#zrBar .zrBtn:hover {
    opacity: 1;
}

#zrTop.zrHide {
    display: none;
}

/* 手机略缩小 */
@media (max-width: 480px) {
    #zrBar {
        right: 10px;
        bottom: 70px;
    }
    #zrBar .zrBtn {
        width: 42px;
        height: 42px;
        font-size: 20px;
    }
}