/* 悬浮反馈按钮 */
#lf-btn {
    position: fixed;
    right: 20px;
    bottom: 80px;
    z-index: 9990;
    background: #409eff;
    color: #fff;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    text-align: center;
    line-height: 44px;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    font-size: 14px;
    cursor: pointer;
    box-shadow: 0 2px 12px rgba(64,158,255,.4);
    -webkit-transition: all .3s;
    transition: all .3s;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}
#lf-btn:hover {
    -webkit-transform: scale(1.08);
    transform: scale(1.08);
    filter: brightness(1.15);
}

/* 弹窗遮罩 */
#lf-modal {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: 100000;
    background: rgba(0,0,0,.45);
}
#lf-modal.lf-show {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
}

/* 弹窗主体 */
.lf-box {
    background: #fff;
    border-radius: 12px;
    padding: 28px 32px;
    width: 360px;
    max-width: 90vw;
    box-shadow: 0 8px 30px rgba(0,0,0,.15);
    -webkit-animation: lfFadeIn .2s ease;
    animation: lfFadeIn .2s ease;
}
@-webkit-keyframes lfFadeIn {
    from { opacity: 0; -webkit-transform: translateY(-10px); }
    to   { opacity: 1; -webkit-transform: translateY(0); }
}
@keyframes lfFadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to   { opacity: 1; transform: translateY(0); }
}

.lf-title {
    font-size: 17px;
    font-weight: 600;
    color: #303133;
    margin-bottom: 4px;
}
.lf-subtitle {
    font-size: 13px;
    color: #909399;
    margin-bottom: 18px;
}

/* 选项 */
.lf-options {
    margin-bottom: 22px;
}
.lf-option {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    padding: 10px 14px;
    margin-bottom: 6px;
    border-radius: 8px;
    cursor: pointer;
    -webkit-transition: background .15s;
    transition: background .15s;
    font-size: 14px;
    color: #333;
}
.lf-option:hover {
    background: #f5f7fa;
}
.lf-option input[type="radio"] {
    margin-right: 10px;
    accent-color: #409eff;
    width: 16px;
    height: 16px;
}
.lf-option input[type="radio"]:checked + span {
    color: #409eff;
    font-weight: 500;
}

/* 按钮 */
.lf-actions {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
}
.lf-submit {
    -webkit-box-flex: 1;
    -ms-flex: 1;
    flex: 1;
    padding: 10px 0;
    border: none;
    border-radius: 8px;
    background: #409eff;
    color: #fff;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    -webkit-transition: background .2s;
    transition: background .2s;
    margin-right: 10px;
}
.lf-submit:hover { filter: brightness(1.15); }
.lf-submit:disabled { background: #a0cfff; cursor: not-allowed; filter: none; }

.lf-cancel {
    -webkit-box-flex: 1;
    -ms-flex: 1;
    flex: 1;
    padding: 10px 0;
    border: 1px solid #dcdfe6;
    border-radius: 8px;
    background: #fff;
    color: #606266;
    font-size: 14px;
    cursor: pointer;
    -webkit-transition: border-color .2s;
    transition: border-color .2s;
}
.lf-cancel:hover { border-color: #409eff; color: #409eff; }