/*************************************************************************************
*
* External
*
*************************************************************************************/

@import url("https://use.typekit.net/gqp2vyu.css");
@import url("https://fonts.googleapis.com/css2?family=Merriweather:wght@300;400;500;600;700&display=swap");
@import url("/birdview/css/birdview.css");

/*************************************************************************************
*
* Settings
*
*************************************************************************************/

:root{
    --page-background: #f3f2ed;
    --text-color: #111;
    --secondary-text-color: rgba(0, 0, 0, 0.6);

    --display: "Merriweather", Georgia, serif;
    --body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Oxygen-Sans, Ubuntu, Cantarell, sans-serif;
    --monospace: "Menlo", Consolas, monospace;

    --article-width: 672px;
    --caption-width: 512px;
    --gallery-width: 1248px;
    --gallery-side-padding: 16px;
    --gallery-gap: 16px;
    --wide-content-width: calc(var(--gallery-width) + var(--gallery-side-padding) + var(--gallery-side-padding));
}

:root{
    --heading-padding-top: 1rem;
    --heading-padding-bottom: 0;
    
    --h1-family: var(--display);
    --h1-color: var(--text-color);
    --h1-size: 2rem;
    --h1-small-size: 1.75rem;
    --h1-weight: 700;
    --h1-line-height: 1.25;
    --h1-letter-spacing: 0;
    --h1-transform: none;
    
    --h2-family: var(--display);
    --h2-size: 1.5rem;
    --h2-weight: 700;
    --h2-line-height: 1.5;
    --h2-letter-spacing: 0;
    --h2-transform: scaleX(1) scaleY(1);
    
    --h3-family: var(--body);
    --h3-size: 1.0625rem;
    --h3-weight: 700;
    --h3-line-height: 1.5;
    --h3-letter-spacing: 0;
    --h3-transform: scaleX(1) scaleY(1);
    
    --content-family: var(--body);
    --content-size: 1rem;
    --content-weight: 400;
    --content-line-height: 1.7;
    
    --info-family: var(--body);
    --info-size: 0.875rem;
    --info-weight: 300;
    --info-line-height: 1.5;
    
    --gist-family: var(--body);
    --gist-size: 0.9375rem;
    --gist-weight: 300;
    --gist-style: italic;
    --gist-line-height: 1.6;
    
    --footer-family: var(--body);
    --footer-size: 0.875rem;
    --footer-weight: 300;
    --footer-line-height: 1.5;
}

.feature{
    --page-background: #fff;

    --heading-padding-top: 1.5em;
    --heading-padding-bottom: 0em;

    --h1-family: "futura-pt";
    --h1-color: var(--text-color);
    --h1-size: 2.5rem;
    --h1-letter-spacing: -1px;
    --h1-transform: scaleX(0.95) scaleY(1.05);
    
    --h1-small-size: 2.25rem;
    
    --h2-family: "futura-pt";
    --h2-size: 1.625rem;
    --h2-letter-spacing: 0px;
    --h2-transform: scaleX(0.95) scaleY(1.05);
    
    --h3-letter-spacing: 0px;
    --h3-transform: scaleX(1) scaleY(1);
    
    --info-family: "futura-pt";
    --info-size: 1rem;
    --info-weight: 400;
}

.feature .site_logo {
    max-width: 100px;    
    padding: 1em 0 0em;
}

.feature .site_logo:hover{
    background: none;
    border: none;
}

.feature .site_logo:active{
    background: none;
    border: none;
}

.feature .blog_header + hr {
    opacity: 0;
}

/*************************************************************************************
*
* Base
*
*************************************************************************************/

html{
    font-size: 16px;
}

body,
.editor_page{
    background-color: var(--page-background-color, var(--page-background));
}

body{
    margin: 0;
    padding: 0;
    color: var(--text-color);
    font-family: var(--body);
    overflow-y: scroll;
}

*{
    box-sizing: border-box;
}

/*************************************************************************************
*
* Blog Header
*
*************************************************************************************/

.site_logo{
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
    width: min(var(--article-width), 100%);
    margin: 0 auto;
    padding: 0.625em 0 0.375em;
    align-items: center;
    justify-content: center;
    color: inherit;
    text-decoration: none;
}

.site_logo img{
    width: 32px;
    height: auto;
}

.site_logo:hover{
    background-color: rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-top: none;
    border-bottom: none;
}

.site_logo:active{
    background-color: rgba(0, 0, 0, 0.1);
    border-color: rgba(0, 0, 0, 0.05);
}

.author{
    font-family: "futura-pt", Futura, sans-serif;
    font-weight: 400;
}

/*************************************************************************************
*
* Article Layout
*
*************************************************************************************/

/*
 
 Regular content occupies the middle column.
 Wide figure content may use the flexible outer columns.
 `.article_content` is the editable part in the editor.
 
 */
.article,
.article_content{
    display: grid;
    grid-template-columns: minmax(var(--gallery-side-padding), 1fr) minmax(0, var(--article-width)) minmax(var(--gallery-side-padding), 1fr);
}

.article{
    max-width: var(--wide-content-width);
    margin: 0 auto;
    padding: 0 0 1rem;
    color: var(--text-color);
    font-family: var(--content-family);
    font-size: var(--content-size);
    font-weight: var(--content-weight);
    line-height: var(--content-line-height);
}

.article > *,
.article_content > *{
    grid-column: 2;
    min-width: 0;
}

.article > .wide,
.article > .grid,
.article_content > .wide,
.article_content > .grid{
    grid-column: 1 / -1;
    justify-self: center;
    width: min(var(--gallery-width), calc(100% - var(--gallery-side-padding) - var(--gallery-side-padding)));
}

hr{
    width: min(var(--article-width), calc(100% - var(--gallery-side-padding) - var(--gallery-side-padding)));
    margin: 0 auto;
    border: 0;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
}

.article hr{
    width: 100%;
    margin: 1rem 0 0;
}

/*************************************************************************************
*
* Article Header
*
*************************************************************************************/

.article_header{
    padding: var(--heading-padding-top) 0 0.5em;
}

.article_title_row{
    display: grid;
    min-height: 44px; /* min height equal to the nav arrows to avoid relayout */
    grid-template-columns: 44px minmax(0, 1fr) 44px;
    align-items: center;
    gap: 1rem;
}

/*× A title without navigation beside it uses the whole row. */
.article_title_row > h1:only-child{
    grid-column: 1 / -1;
}

.article h1{
    color: var(--h1-color);
    grid-column: 2;
    margin: 0;
    font-family: var(--h1-family);
    font-size: var(--h1-size);
    font-weight: var(--h1-weight);
    line-height: var(--h1-line-height);
    text-align: center;
    letter-spacing: var(--h1-letter-spacing);
    transform: var(--h1-transform);
}

.article h1 a{
    color: inherit;
    text-decoration: none;
}

.article h1 a:hover,
.article h1 a:active{
    text-decoration: underline;
}

.article_navigation_arrow{
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    color: inherit;
    text-decoration: none;
    border-radius: 6px;
}

.article_navigation_arrow:hover{
    background-color: rgba(255, 255, 255, 0.8);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.16);
}

.article_navigation_arrow:active{
    background-color: rgba(255, 255, 255, 0.55);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.12);
}

/* Navigation arrows */
.article_navigation_arrow::before{
    content: "";
    width: 24px;
    height: 24px;
    background: center / contain no-repeat;
}

.article_navigation_newer{
    grid-column: 1;
    grid-row: 1;
}

.article_navigation_newer::before{
    background-image: url("elements/icon-left.png");
}

.article_navigation_older{
    grid-column: 3;
    grid-row: 1;
}

.article_navigation_older::before{
    background-image: url("elements/icon-right.png");
}

.article .info{
    margin: 0;
    padding: 0.25rem 0 0;
    padding-bottom: var(--heading-padding-bottom);
    font-family: var(--info-family);
    font-size: var(--info-size);
    font-weight: var(--info-weight);
    line-height: var(--info-line-height);
    text-align: center;
}

.article .info a{
    text-decoration: underline;
}

.article .info_blog + .info_date::before,
.article .info_author + .info_date::before{
    content: ", ";
}


.article .gist{
    max-width: 32em;
    margin: 2em auto 1em;
    padding: 0 1em;
    font-family: var(--gist-family);
    font-size: var(--gist-size);
    font-weight: var(--gist-weight);
    font-style: var(--gist-style);
    line-height: var(--gist-line-height);
}

/*************************************************************************************
*
* Filters
*
*************************************************************************************/

.filters{
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
    margin: 1.5rem 0;
    padding: 0;
}

.filters button{
    flex: 1 1 auto;
    min-height: 2.1rem;
    margin: 0;
    padding: 0.3rem 0.75rem;
    color: inherit;
    font-family: var(--body);
    font-size: 0.875rem;
    font-weight: 300;
    background-color: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 0.2rem;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    -webkit-tap-highlight-color: transparent;
}

.filters button:hover{
    background-color: rgba(255, 255, 255, 1);
}

.filters button.selected_filter{
    color: #fff;
    background-color: rgba(0, 0, 0, 0.6);
    border-color: transparent;
}

/*************************************************************************************
*
* Blog index
*
*************************************************************************************/

.blog_index .article_title_row{
    position: relative;
}

.blog_index h1 a{
    position: static;
}

.blog_title_icon{
    position: absolute;
    left: 6px;
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: auto;
}

.blog_index .article_header {
    padding-bottom: 0;
}

.article_list{
    display: grid;
    gap: 1.5rem;
}

.article_nav_item{
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: baseline;
    column-gap: 1rem;
    padding: 0;
}

.article .article_nav_item > h2{
    grid-column: 1;
    grid-row: 1;
    margin: 0;
    font-family: var(--display);
    font-size: 1.25em;
    font-weight: 700;
    line-height: 1.5;
}

.article_nav_item h2 a{
    color: inherit;
    text-decoration: none;
}

.article_nav_item h2 a:hover,
.article_nav_item h2 a:active,
.article_nav_item h2 a:focus-visible{
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 0.15em;
}

.article_nav_item time{
    grid-column: 2;
    grid-row: 1;
    color: var(--secondary-text-color);
    font-size: 0.875rem;
    font-weight: 300;
    line-height: 1.7;
    white-space: nowrap;
}

.article .article_nav_item > p{
    grid-column: 1;
    max-width: 31rem;
    margin: 0.1rem 0 0;
    color: var(--secondary-text-color);
    font-size: 0.875rem;
    font-weight: 300;
    line-height: 1.5;
    
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.article_nav_item.filtered_out{
    display: none;
}

/*************************************************************************************
*
* Typography
*
*************************************************************************************/

.article h2{
    margin: 1em 0 0;
    font-family: var(--h2-family);
    font-size: var(--h2-size);
    font-weight: var(--h2-weight);
    line-height: var(--h2-line-height);
    letter-spacing: var(--h2-letter-spacing);
    transform: var(--h2-transform);
    transform-origin: 0% 50%;
}

.article h3{
    margin: 1.5rem 0 0;
    font-family: var(--h3-family);
    font-size: var(--h3-size);
    font-weight: var(--h3-weight);
    line-height: var(--h3-line-height);
    letter-spacing: var(--h3-letter-spacing);
    transform: var(--h3-transform);
    transform-origin: 0% 50%;
}

.article p:where(:not(.info):not(.gist)),
.article ul,
.article ol{
    margin-top: 1em;
    margin-bottom: 0;
    font-size: inherit;
    font-weight: inherit;
    line-height: inherit;
}

.article ul,
.article ol{
    margin-top: 0.5em;
}

.article ul,
.article ol{
    padding-left: 1.5rem;
}

.article li{
    margin: 0.35rem 0;
    padding-left: 0.25rem;
}

.article li > p:first-child{
    margin: 0;
}

.article li > ul,
.article li > ol{
    margin: 0.5em 0 0;
}

.article blockquote{
    margin: 1em 0;
    padding-left: 1em;
    border-left: 1px solid rgba(0, 0, 0, 0.4);
}

.article blockquote p{
    margin: 0.5em 0;
    font-style: italic;
    line-height: 1.8;
}

.article blockquote cite{
    display: block;
    margin-top: 0.5rem;
    font-style: normal;
}

.article q{
    font-style: italic;
}

.article aside{
    position: relative;
    margin: 1.5rem 0;
    padding: 0 1rem 1rem 4rem;
    font-style: italic;
    background-color: rgba(128, 128, 128, 0.05);
    border: 1px solid rgba(128, 128, 128, 0.2);
}

.article aside::before{
    position: absolute;
    top: 50%;
    left: 1rem;
    display: block;
    width: 2rem;
    height: 2rem;
    margin-top: -1rem;
    color: rgba(0, 0, 0, 0.4);
    font-style: italic;
    font-weight: 700;
    line-height: 2rem;
    text-align: center;
    content: "i";
    border: 1px solid rgba(0, 0, 0, 0.4);
    border-radius: 50%;
}

.article .left_align { text-align: left; }
.article .center { text-align: center; }
.article .right_align { text-align: right; }

/*************************************************************************************
*
* Code
*
*************************************************************************************/

.article code{
    margin: 0;
    padding: 0.1rem 0.25rem;
    font-family: var(--monospace);
    font-size: 0.875em;
    background-color: rgba(0, 0, 0, 0.025);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 0.2rem;
}

.article pre{
    margin: 1rem 0;
}

.article pre code{
    display: block;
    padding: 0.85rem;
    overflow-x: auto;
    font-size: 0.8rem;
    line-height: 1.5;
    -webkit-overflow-scrolling: touch;
}

.article pre[data-language]{
    position: relative;
}

.article pre[data-language] code{
    color: var(--syntax-foreground);
}

.article pre[data-language]::after{
    content: attr(data-language);
    position: absolute;
    top: 4px;
    right: 6px;
    font: 0.65rem/1.2 system-ui, sans-serif;
    opacity: 0.65;
    pointer-events: none;
    user-select: none;
}

/*************************************************************************************
*
* Media Blocks
*
*************************************************************************************/

/*×
 * Regular and wide figures stack vertically. Only grid figures form rows.
 * Media keep their requested width, capped by their containing figure.
 * Grid rows wrap naturally; JavaScript does not measure or rearrange them.
 * Captions retain their independent editorial width in every layout.
 */
.article .media_block{
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--gallery-gap);
    margin: 1em 0;
    /* background: #000;
    border-radius: 0.5em; */
}

.article .media_block.grid{
    flex-flow: row wrap;
    align-items: flex-start;
    /*
    This centers all media horizontally.
    Use my own article From inline-block to CSS Grid to make a better CSS layout.
    */
    justify-content: center;
}

.article .media_block.grid figcaption{
    flex-basis: 100%;
}

.article h2 + .media_block,
.article h3 + .media_block{
    margin-top: 0.75rem;
}

/*
 * Every media item uses its specified width, capped by the available space.
 */
.article .media_block img,
.article .media_block video,
.article .media_block audio{
    display: block;
    flex: none;
    width: min(var(--media-width, 100%), 100%);
    height: auto;
    margin: 0;
}

.article .media_block audio{
    min-height: 3.375rem;
}

.article .media_block video:focus{
    outline: none;
}

.article figcaption{
    flex: none;
    width: 100%;
    padding-inline: max(var(--gallery-side-padding), calc((100% - var(--caption-width)) / 2));
    margin: 0;
    font-size: 0.875rem;
    line-height: 1.5;
}

/*×
 * Referenced media share one presentation in the editor and generated articles.
 * Native image/video dimensions are supplied once by the media load event.
 * Explicit widths override defaults; only CSS constrains them to the figure.
 */
.article .media_item {
    flex: none;
    min-width: 0;
    max-width: 100%;
    width: min(var(--media-width, var(--media-default-width, var(--article-width))), 100%);
    margin: 0;
}

.article .media_item[data-media-type="image"],
.article .media_item[data-media-type="video"] {
    --media-default-width: calc(var(--media-source-width, calc(var(--article-width) * 2)) / 2);
}

.article .media_item[data-media-type="embed"] {
    --media-default-width: var(--embed-width, var(--article-width));
}

.article .media_item > img,
.article .media_item > video,
.article .media_item > audio,
.article .media_item > iframe {
    display: block;
    width: 100%;
    max-width: 100%;
    height: auto;
    margin: 0;
}

.article .media_item > iframe {
    aspect-ratio: var(--embed-ratio, 16 / 9);
    border: 0;
}

.article .media_item > video {
    aspect-ratio: var(--media-source-ratio, auto);
}

.article .media_unavailable {
    display: block;
    padding: 1rem;
    border: 1px dashed currentColor;
    font-size: 0.875em;
    line-height: 1.5;
    overflow-wrap: anywhere;
}

.article .media_item > [hidden] {
    display: none;
}

/*************************************************************************************
*
* Media Player click-to-play
*
*************************************************************************************/

.media_item .embed_poster {
    position: relative;
    display: block;
    width: 100%;
    aspect-ratio: var(--embed-ratio, 16 / 9);
    padding: 0;
    border: 0;
    background: transparent;
    color: white;
    cursor: pointer;
}
.media_item .embed_poster img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.embed_play {
    position: absolute;
    inset: 50% auto auto 50%;
    transform: translate(-50%, -50%);
    padding: 0.6rem 1rem;
    border-radius: 0.4rem;
    background: #e10000;
    font-size: 16px;
    font-weight: 500;
}
.media_item .embed_poster[hidden],
.media_item .embed_poster img[hidden],
.media_item iframe[hidden] {
    display: none;
}

/*************************************************************************************
*
* Footer
*
*************************************************************************************/

.blog_footer{
    font-family: var(--footer-family);
    font-size: var(--footer-size);
    font-weight: var(--footer-weight);
    line-height: var(--footer-line-height);
    width: min(var(--article-width), calc(100% - 2rem));
    margin: 0 auto;
    padding: 1rem 0;
    text-align: center;
}

.keyboard_shortcuts{
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: center;
    gap: 8px;
}

.keyboard_shortcut{
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    color: var(--secondary-text-color);
    font-size: 0.5rem;
}

.keyboard_shortcut_birdview{
    margin-left: 52px;
}

.keycap{
    font-family: inherit;
    display: grid;
    place-items: center;
    width: 44px;
    height: 44px;
    margin: 0;
    padding: 0;
    color: var(--secondary-text-color);
    font-size: 1.125rem;
    line-height: 1;
    text-decoration: none;
    background-color: rgba(255, 255, 255, 0.85);
    border: 1px solid rgba(0, 0, 0, 0.18);
    border-radius: 5px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.16);
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
}

.keycap:hover{
    color: var(--text-color);
    background-color: rgba(255, 255, 255, 1);
}

.keycap:active{
    background-color: rgba(255, 255, 255, 0.6);
    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.12);
}

.blog_copyright{
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.3em;
    margin: 1rem 0 0;
    color: var(--secondary-text-color);
    font-size: inherit;
    font-weight: inherit;
    line-height: inherit;
}

.blog_copyright a{
    color: inherit;
}

/*************************************************************************************
*
* Responsive
*
*************************************************************************************/

@media screen and (max-width: 47rem){
    .article{
        grid-template-columns: var(--gallery-side-padding) minmax(0, 1fr) var(--gallery-side-padding);
    }

    .article_title_row{
        gap: 0.5rem;
    }

    .article h1{
        font-size: var(--h1-small-size);
    }
}

@media screen and (max-width: 32rem){
    .filters{
        justify-content: flex-start;
    }

    .article_nav_item{
        grid-template-columns: minmax(0, 1fr);
    }

    .article_nav_item time{
        grid-column: 1;
        grid-row: auto;
        margin-top: 0.15rem;
    }
}