// 表单组
.form-group-x() {
    vertical-align: middle;
    .font-size(0);

    select,
    textarea,
    input,
    button,
    a {
        &:focus {
            position: relative;
            z-index: 1;
        }
    }

    >select:not(:first-child),
    >textarea:not(:first-child),
    >input:not(:first-child),
    >button:not(:first-child),
    >a:not(:first-child),
    >:not(:first-child) select,
    >:not(:first-child) textarea,
    >:not(:first-child) input,
    >:not(:first-child) button,
    >:not(:first-child) a {
        margin-left: -1px !important;
        border-top-left-radius: 0 !important;
        border-bottom-left-radius: 0 !important;
    }

    >select:not(:last-child),
    >textarea:not(:last-child),
    >input:not(:last-child),
    >button:not(:last-child),
    >a:not(:last-child),
    >:not(:last-child) select,
    >:not(:last-child) textarea,
    >:not(:last-child) input,
    >:not(:last-child) button,
    >:not(:last-child) a {
        border-top-right-radius: 0 !important;
        border-bottom-right-radius: 0 !important;
    }
}
.form-group-y() {
    vertical-align: middle;
    .font-size(0);

    select,
    textarea,
    input,
    button,
    a {
        &:focus {
            position: relative;
            z-index: 1;
        }
    }

    >select:not(:first-child),
    >textarea:not(:first-child),
    >input:not(:first-child),
    >button:not(:first-child),
    >a:not(:first-child),
    >:not(:first-child) select,
    >:not(:first-child) textarea,
    >:not(:first-child) input,
    >:not(:first-child) button,
    >:not(:first-child) a {
        margin-top: -1px !important;
        border-top-left-radius: 0 !important;
        border-top-right-radius: 0 !important;
    }

    >select:not(:last-child),
    >textarea:not(:last-child),
    >input:not(:last-child),
    >button:not(:last-child),
    >a:not(:last-child),
    >:not(:last-child) select,
    >:not(:last-child) textarea,
    >:not(:last-child) input,
    >:not(:last-child) button,
    >:not(:last-child) a {
        border-bottom-left-radius: 0 !important;
        border-bottom-right-radius: 0 !important;
    }
}