uikit/src/less/components/base.less

UIkit is a lightweight and modular front-end framework for developing fast and powerful web interfaces.

// Name:            Base
// Description:     Default values for HTML elements
//
// Component:       `uk-link`
//                  `uk-h1`, `uk-h2`, `uk-h3`, `uk-h4`, `uk-h5`, `uk-h6`
//                  `uk-hr`
//
// ========================================================================


// Variables
// ========================================================================

@base-body-background:                          @global-background;
@base-body-font-family:                         @global-font-family;
@base-body-font-weight:                         normal;
@base-body-font-size:                           @global-font-size;
@base-body-line-height:                         @global-line-height;
@base-body-color:                               @global-color;

@base-link-color:                               @global-link-color;
@base-link-text-decoration:                     none;
@base-link-hover-color:                         @global-link-hover-color;
@base-link-hover-text-decoration:               underline;

@base-strong-font-weight:                       bolder;
@base-code-font-size:                           @global-small-font-size;
@base-code-font-family:                         Consolas, monaco, monospace;
@base-code-color:                               @global-danger-background;
@base-em-color:                                 @global-danger-background;
@base-ins-background:                           #ffd;
@base-ins-color:                                @global-color;
@base-mark-background:                          #ffd;
@base-mark-color:                               @global-color;
@base-quote-font-style:                         italic;
@base-small-font-size:                          80%;

@base-margin-vertical:                          @global-margin;

@base-heading-font-family:                      @global-font-family;
@base-heading-font-weight:                      normal;
@base-heading-color:                            @global-emphasis-color;
@base-heading-text-transform:                   none;
@base-heading-margin-top:                       @global-medium-margin;
@base-h1-font-size-m:                           @global-2xlarge-font-size;
@base-h1-font-size:                             @base-h1-font-size-m * 0.85;
@base-h1-line-height:                           1.2;
@base-h2-font-size-m:                           @global-xlarge-font-size;
@base-h2-font-size:                             @base-h2-font-size-m * 0.85;
@base-h2-line-height:                           1.3;
@base-h3-font-size:                             @global-large-font-size;
@base-h3-line-height:                           1.4;
@base-h4-font-size:                             @global-medium-font-size;
@base-h4-line-height:                           1.4;
@base-h5-font-size:                             @global-font-size;
@base-h5-line-height:                           1.4;
@base-h6-font-size:                             @global-small-font-size;
@base-h6-line-height:                           1.4;

@base-list-padding-left:                        30px;

@base-hr-margin-vertical:                       @global-margin;
@base-hr-border-width:                          @global-border-width;
@base-hr-border:                                @global-border;

@base-blockquote-font-size:                     @global-medium-font-size;
@base-blockquote-line-height:                   1.5;
@base-blockquote-font-style:                    italic;
@base-blockquote-margin-vertical:               @global-margin;
@base-blockquote-footer-margin-top:             @global-small-margin;
@base-blockquote-footer-font-size:              @global-small-font-size;
@base-blockquote-footer-line-height:            1.5;

@base-pre-font-size:                            @global-small-font-size;
@base-pre-line-height:                          1.5;
@base-pre-font-family:                          @base-code-font-family;
@base-pre-color:                                @global-color;

@base-selection-background:                     #39f;
@base-selection-color:                          @global-inverse-color;


/* ========================================================================
   Component: Base
 ========================================================================== */

/*
 * 1. Set `font-size` to support `rem` units
 *    Not using `font` property because a leading hyphen (e.g. -apple-system) causes the font to break in IE11 and Edge
 * 2. Prevent adjustments of font size after orientation changes in iOS.
 * 3. Style
 */

html {
    /* 1 */
    font-family: @base-body-font-family;
    font-size: @base-body-font-size;
    font-weight: @base-body-font-weight;
    line-height: @base-body-line-height;
    /* 2 */
    -webkit-text-size-adjust: 100%;
    /* 3 */
    background: @base-body-background;
    color: @base-body-color;
    .hook-base-body;
}

/*
 * Remove the margin in all browsers.
 */

body { margin: 0; }


/* Links
 ========================================================================== */

/*
 * Remove the outline on focused links when they are also active or hovered
 */

a:active,
a:hover { outline: none; }

/*
 * Style
 */

a,
.uk-link {
    color: @base-link-color;
    text-decoration: @base-link-text-decoration;
    cursor: pointer;
    .hook-base-link;
}

a:hover,
.uk-link:hover,
.uk-link-toggle:hover .uk-link,
.uk-link-toggle:focus .uk-link {
    color: @base-link-hover-color;
    text-decoration: @base-link-hover-text-decoration;
    .hook-base-link-hover;
}


/* Text-level semantics
 ========================================================================== */

/*
 * 1. Add the correct text decoration in Edge.
 * 2. The shorthand declaration `underline dotted` is not supported in Safari.
 */

abbr[title] {
    /* 1 */
    text-decoration: underline dotted;
    /* 2 */
    -webkit-text-decoration-style: dotted;
}

/*
 * Add the correct font weight in Chrome, Edge, and Safari.
 */

b,
strong { font-weight: @base-strong-font-weight; }

/*
 * 1. Consolas has a better baseline in running text compared to `Courier`
 * 2. Correct the odd `em` font sizing in all browsers.
 * 3. Style
 */

:not(pre) > code,
:not(pre) > kbd,
:not(pre) > samp {
    /* 1 */
    font-family: @base-code-font-family;
    /* 2 */
    font-size: @base-code-font-size;
    /* 3 */
    color: @base-code-color;
    white-space: nowrap;
    .hook-base-code;
}

/*
 * Emphasize
 */

em { color: @base-em-color; }

/*
 * Insert
 */

ins {
    background: @base-ins-background;
    color: @base-ins-color;
    text-decoration: none;
}

/*
 * Mark
 */

mark {
    background: @base-mark-background;
    color: @base-mark-color;
}

/*
 * Quote
 */

q { font-style: @base-quote-font-style; }

/*
 * Add the correct font size in all browsers.
 */

small { font-size: @base-small-font-size; }

/*
 * Prevents `sub` and `sup` affecting `line-height` in all browsers.
 */

sub,
sup {
    font-size: 75%;
    line-height: 0;
    position: relative;
    vertical-align: baseline;
}

sup { top: -0.5em; }
sub { bottom: -0.25em; }


/* Embedded content
 ========================================================================== */

/*
 * Remove the gap between embedded content and the bottom of their containers.
 */

audio,
canvas,
iframe,
img,
svg,
video { vertical-align: middle; }

/*
 * 1. Add responsiveness.
 * 2. Auto-scale the height. Only needed if `height` attribute is present.
 * 3. Corrects responsive `max-width` behavior if padding and border are used.
 * 4. Exclude SVGs for IE11 because they don't preserve their aspect ratio.
 */

canvas,
img,
video {
    /* 1 */
    max-width: 100%;
    /* 2 */
    height: auto;
    /* 3 */
    box-sizing: border-box;
}

/* 4 */
@supports (display: block) {

   svg {
        max-width: 100%;
        height: auto;
        box-sizing: border-box;
    }

}

/*
 * Hide the overflow in IE.
 */

svg:not(:root) { overflow: hidden; }

/*
 * 1. Fix lazy loading images if parent element is set to `display: inline` and has `overflow: hidden`.
 * 2. Hide `alt` text for lazy loading images.
 * Note: Selector for background while loading img[data-src*='.jpg'][src*='data:image'] { background: grey; }
 */

img:not([src]) {
    /* 1 */
    min-width: 1px;
    /* 2 */
    visibility: hidden;
}

/*
 * Iframe
 * Remove border in all browsers
 */

iframe { border: 0; }


/* Block elements
 ========================================================================== */

/*
 * Margins
 */

p,
ul,
ol,
dl,
pre,
address,
fieldset,
figure { margin: 0 0 @base-margin-vertical 0; }

/* Add margin if adjacent element */
* + p,
* + ul,
* + ol,
* + dl,
* + pre,
* + address,
* + fieldset,
* + figure { margin-top: @base-margin-vertical; }


/* Headings
 ========================================================================== */

h1, .uk-h1,
h2, .uk-h2,
h3, .uk-h3,
h4, .uk-h4,
h5, .uk-h5,
h6, .uk-h6,
.uk-heading-small,
.uk-heading-medium,
.uk-heading-large,
.uk-heading-xlarge,
.uk-heading-2xlarge {
    margin: 0 0 @base-margin-vertical 0;
    font-family: @base-heading-font-family;
    font-weight: @base-heading-font-weight;
    color: @base-heading-color;
    text-transform: @base-heading-text-transform;
    .hook-base-heading;
}

/* Add margin if adjacent element */
* + h1, * + .uk-h1,
* + h2, * + .uk-h2,
* + h3, * + .uk-h3,
* + h4, * + .uk-h4,
* + h5, * + .uk-h5,
* + h6, * + .uk-h6,
* + .uk-heading-small,
* + .uk-heading-medium,
* + .uk-heading-large,
* + .uk-heading-xlarge,
* + .uk-heading-2xlarge { margin-top: @base-heading-margin-top; }

/*
 * Sizes
 */

h1, .uk-h1 {
    font-size: @base-h1-font-size;
    line-height: @base-h1-line-height;
    .hook-base-h1;
}

h2, .uk-h2 {
    font-size: @base-h2-font-size;
    line-height: @base-h2-line-height;
    .hook-base-h2;
}

h3, .uk-h3 {
    font-size: @base-h3-font-size;
    line-height: @base-h3-line-height;
    .hook-base-h3;
}

h4, .uk-h4 {
    font-size: @base-h4-font-size;
    line-height: @base-h4-line-height;
    .hook-base-h4;
}

h5, .uk-h5 {
    font-size: @base-h5-font-size;
    line-height: @base-h5-line-height;
    .hook-base-h5;
}

h6, .uk-h6 {
    font-size: @base-h6-font-size;
    line-height: @base-h6-line-height;
    .hook-base-h6;
}

/* Tablet landscape and bigger */
@media (min-width: @breakpoint-medium) {

    h1, .uk-h1 { font-size: @base-h1-font-size-m; }
    h2, .uk-h2 { font-size: @base-h2-font-size-m; }

}


/* Lists
 ========================================================================== */

ul,
ol { padding-left: @base-list-padding-left; }

/*
 * Reset margin for nested lists
 */

ul > li > ul,
ul > li > ol,
ol > li > ol,
ol > li > ul { margin: 0; }


/* Description lists
 ========================================================================== */

dt { font-weight: bold; }
dd { margin-left: 0; }


/* Horizontal rules
 ========================================================================== */

/*
 * 1. Show the overflow in Chrome, Edge and IE.
 * 2. Add the correct text-align in Edge and IE.
 * 3. Style
 */

hr, .uk-hr {
    /* 1 */
    overflow: visible;
    /* 2 */
    text-align: inherit;
    /* 3 */
    margin: 0 0 @base-hr-margin-vertical 0;
    border: 0;
    border-top: @base-hr-border-width solid @base-hr-border;
    .hook-base-hr;
}

/* Add margin if adjacent element */
* + hr,
* + .uk-hr { margin-top: @base-hr-margin-vertical }


/* Address
 ========================================================================== */

address { font-style: normal; }


/* Blockquotes
 ========================================================================== */

blockquote {
    margin: 0 0 @base-blockquote-margin-vertical 0;
    font-size: @base-blockquote-font-size;
    line-height: @base-blockquote-line-height;
    font-style: @base-blockquote-font-style;
    .hook-base-blockquote;
}

/* Add margin if adjacent element */
* + blockquote { margin-top: @base-blockquote-margin-vertical; }

/*
 * Content
 */

blockquote p:last-of-type { margin-bottom: 0; }

blockquote footer {
    margin-top:  @base-blockquote-footer-margin-top;
    font-size: @base-blockquote-footer-font-size;
    line-height: @base-blockquote-footer-line-height;
    .hook-base-blockquote-footer;
}


/* Preformatted text
 ========================================================================== */

/*
 * 1. Contain overflow in all browsers.
 */

pre {
    font: @base-pre-font-size e("/") @base-pre-line-height @base-pre-font-family;
    color: @base-pre-color;
    -moz-tab-size: 4;
    tab-size: 4;
    /* 1 */
    overflow: auto;
    .hook-base-pre;
}

pre code { font-family: @base-pre-font-family; }


/* Selection pseudo-element
 ========================================================================== */

::selection {
    background: @base-selection-background;
    color: @base-selection-color;
    text-shadow: none;
}


/* HTML5 elements
 ========================================================================== */

/*
 * 1. Add the correct display in Edge, IE 10+, and Firefox.
 * 2. Add the correct display in IE.
 */

details, /* 1 */
main { /* 2 */
    display: block;
}

/*
 * Add the correct display in all browsers.
 */

summary { display: list-item; }

/*
 * Add the correct display in IE.
 */

template { display: none; }


/* Pass media breakpoints to JS
 ========================================================================== */

/*
 * Breakpoints
 */

.uk-breakpoint-s::before  { content: '@{breakpoint-small}'; }
.uk-breakpoint-m::before  { content: '@{breakpoint-medium}'; }
.uk-breakpoint-l::before  { content: '@{breakpoint-large}'; }
.uk-breakpoint-xl::before { content: '@{breakpoint-xlarge}'; }

:root {
    --uk-breakpoint-s: @breakpoint-small;
    --uk-breakpoint-m: @breakpoint-medium;
    --uk-breakpoint-l: @breakpoint-large;
    --uk-breakpoint-xl: @breakpoint-xlarge;
}

// Hooks
// ========================================================================

.hook-base-misc;

.hook-base-body() {}
.hook-base-link() {}
.hook-base-link-hover() {}
.hook-base-code() {}
.hook-base-heading() {}
.hook-base-h1() {}
.hook-base-h2() {}
.hook-base-h3() {}
.hook-base-h4() {}
.hook-base-h5() {}
.hook-base-h6() {}
.hook-base-hr() {}
.hook-base-blockquote() {}
.hook-base-blockquote-footer() {}
.hook-base-pre() {}
.hook-base-misc() {}


// Inverse
// ========================================================================

@inverse-base-color:                           @inverse-global-color;
@inverse-base-link-color:                      @inverse-global-emphasis-color;
@inverse-base-link-hover-color:                @inverse-global-emphasis-color;
@inverse-base-code-color:                      @inverse-global-color;
@inverse-base-em-color:                        @inverse-global-emphasis-color;
@inverse-base-heading-color:                   @inverse-global-emphasis-color;
@inverse-base-hr-border:                       @inverse-global-border;

.hook-inverse() {

    color: @inverse-base-color;

    // Base
    // ========================================================================

    //
    // Link
    //

    a,
    .uk-link  {
        color: @inverse-base-link-color;
        .hook-inverse-base-link;
    }

    a:hover,
    .uk-link:hover {
        color: @inverse-base-link-hover-color;
        .hook-inverse-base-link-hover;
    }

    //
    // Code
    //

    :not(pre) > code,
    :not(pre) > kbd,
    :not(pre) > samp {
        color: @inverse-base-code-color;
        .hook-inverse-base-code;
    }

    //
    // Emphasize
    //

    em { color: @inverse-base-em-color; }

    //
    // Headings
    //

    h1, .uk-h1,
    h2, .uk-h2,
    h3, .uk-h3,
    h4, .uk-h4,
    h5, .uk-h5,
    h6, .uk-h6,
    .uk-heading-small,
    .uk-heading-medium,
    .uk-heading-large,
    .uk-heading-xlarge,
    .uk-heading-2xlarge {
        color: @inverse-base-heading-color;
        .hook-inverse-base-heading;
    }

    h1, .uk-h1 {
        .hook-inverse-base-h1;
    }

    h2, .uk-h2 {
        .hook-inverse-base-h2;
    }

    h3, .uk-h3 {
        .hook-inverse-base-h3;
    }

    h4, .uk-h4 {
        .hook-inverse-base-h4;
    }

    h5, .uk-h5 {
        .hook-inverse-base-h5;
    }

    h6, .uk-h6 {
        .hook-inverse-base-h6;
    }

    //
    // Blockquotes
    //

    blockquote {
        .hook-inverse-base-blockquote;
    }

    blockquote footer {
        .hook-inverse-base-blockquote-footer;
    }

    //
    // Horizontal rules
    //

    hr, .uk-hr {
        border-top-color: @inverse-base-hr-border;
        .hook-inverse-base-hr;
    }

}

.hook-inverse-base-link() {}
.hook-inverse-base-link-hover() {}
.hook-inverse-base-code() {}
.hook-inverse-base-heading() {}
.hook-inverse-base-h1() {}
.hook-inverse-base-h2() {}
.hook-inverse-base-h3() {}
.hook-inverse-base-h4() {}
.hook-inverse-base-h5() {}
.hook-inverse-base-h6() {}
.hook-inverse-base-blockquote() {}
.hook-inverse-base-blockquote-footer() {}
.hook-inverse-base-hr() {}