//
// Buttons
// --------------------------------------------------

// Base styles
// --------------------------------------------------

.btn {
    display: inline-block;
    margin-bottom: 0; // For input.btn
    font-weight: @btn-font-weight;
    text-align: center;
    vertical-align: middle;
    touch-action: manipulation;
    cursor: pointer;
    outline: 0 !important;
    background-image: none; // Reset unusual Firefox-on-Android default style; see https://github.com/necolas/normalize.css/issues/214
    border: @btn-border-size solid transparent;
    white-space: nowrap;
    .button-size(@padding-base-vertical; @padding-base-horizontal; @font-size-base; @line-height-base; @btn-border-radius-base);
    .user-select(none);

    &,
    &:active,
    &.active {
        &:focus,
        &.focus {
            .tab-focus();
        }
    }

    &:hover,
    &:focus,
    &.focus {
        color: @btn-default-color;
        text-decoration: none;
    }

    &:active,
    &.active {
        outline: 0;
        background-image: none;
        //.box-shadow(inset 0 3px 5px rgba(0, 0, 0, .125));
    }

    &.disabled,
    &[disabled],
    fieldset[disabled] & {
        cursor: @cursor-disabled;
        .opacity(.65);
        //.box-shadow(none);

        &:after {
            display: none;
        }
    }

    a& {
        &.disabled,
        fieldset[disabled] & {
            pointer-events: none; // Future-proof disabling of clicks on `<a>` elements
        }
    }
}

// Alternate buttons
// --------------------------------------------------

.btn-default {
    .button-ripple;
    //这里没有使用 .button-variant 因为要遵循规范
    //http://pagurian.com/design/widgets/character&icon_button.html
    color: @btn-default-color;
    background-color: @btn-default-bg;
    border-color: @btn-default-border;

    &:focus,
    &.focus {
        color: @btn-default-color;
        background-color: @btn-default-focus-bg;
        border-color: @btn-default-focus-bg;
    }
    &:hover {
        color: @btn-default-color;
        background-color: @btn-default-hover-bg;
        border-color: @btn-default-hover-bg;
    }
    &:active,
    &.active,
    .open > .dropdown-toggle& {
        color: @btn-default-color;
        background-color: @btn-default-active-bg;
        border-color: @btn-default-active-bg;

        &:hover {
            color: @btn-default-color;
            background-color: @btn-default-hover-bg;
            border-color: @btn-default-hover-bg;
        }

        &:focus,
        &.focus {
            color: @btn-default-color;
            background-color: @btn-default-focus-bg;
            border-color: @btn-default-focus-bg;
        }
    }
    &:active,
    &.active,
    .open > .dropdown-toggle& {
        background-image: none;
    }
    &.disabled,
    &[disabled],
    fieldset[disabled] & {
        &:hover,
        &:focus,
        &.focus {
            background-color: @btn-default-disabled-bg;
            border-color: @btn-default-disabled-bg;
        }
    }

    .badge {
        color: @btn-default-bg;
        background-color: @btn-default-color;
    }
}

.btn-primary {
    .button-variant(@btn-primary-color; @btn-primary-bg; @btn-primary-border);
}

// Success appears as green
.btn-success {
    .button-variant(@btn-success-color; @btn-success-bg; @btn-success-border);
}

// Info appears as blue-green
.btn-info {
    .button-variant(@btn-info-color; @btn-info-bg; @btn-info-border);
}

// Warning appears as orange
.btn-warning {
    .button-variant(@btn-warning-color; @btn-warning-bg; @btn-warning-border);
}

// Danger and error appear as red
.btn-danger {
    .button-variant(@btn-danger-color; @btn-danger-bg; @btn-danger-border);
}

// Link buttons
// -------------------------

// Make a button look and behave like a link
.btn-link {
    color: @link-color;
    font-weight: normal;
    border-radius: 0;

    &,
    &:active,
    &.active,
    &[disabled],
    fieldset[disabled] & {
        background-color: transparent;
        //.box-shadow(none);
    }
    &,
    &:hover,
    &:focus,
    &:active {
        border-color: transparent;
    }

    &:hover,
    &:focus {
        color: @link-hover-color;
        text-decoration: @link-hover-decoration;
        background-color: transparent;
    }
    &[disabled],
    fieldset[disabled] & {
        &:hover,
        &:focus {
            color: @btn-link-disabled-color;
            text-decoration: none;
        }
    }
}

// Button Sizes
// --------------------------------------------------

.btn-lg {
    // line-height: ensure even-numbered height of button next to large input
    .button-size(@padding-large-vertical; @padding-large-horizontal; @font-size-large; @line-height-large; @btn-border-radius-large);
}

.btn-sm {
    // line-height: ensure proper height of button next to small input
    .button-size(@padding-small-vertical; @padding-small-horizontal; @font-size-small; @line-height-small; @btn-border-radius-small);
}

.btn-xs {
    .button-size(@padding-xs-vertical; @padding-xs-horizontal; @font-size-small; @line-height-small; @btn-border-radius-small);
}

// Block button
// --------------------------------------------------

.btn-block {
    display: block;
    width: 100%;
}

// Vertically space out multiple block buttons
.btn-block + .btn-block {
    margin-top: 5px;
}

// Specificity overrides
input[type="submit"],
input[type="reset"],
input[type="button"] {
    &.btn-block {
        width: 100%;
    }
}