/* fonts */

@font-face {
    font-family: inter;
    src: url("../fonts/inter.var.subset.woff2") format("woff2");
    font-style: oblique 0deg 10deg;
    font-weight: 100 900;
    font-display: swap;
}

@font-face {
    font-family: jetbrainsmono;
    font-display: swap;
    font-weight: 700;
    src: url("../fonts/jetbrainsmono-bold.subset.woff2") format("woff2");
}

@font-face {
    font-family: jetbrainsmono;
    font-display: swap;
    font-weight: 400;
    src: url("../fonts/jetbrainsmono-regular.subset.woff2") format("woff2");
}

@font-face {
    font-family: ampersand;
    src: local("baskerville"), local("georgia"), local("garamond"), local("palatino"), local("Times New Roman");
    unicode-range: u+26;
}

/* tokens */

:root {
    --font: inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif,
        "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    --font-mono: jetbrainsmono, menlo, hack, consolas, "roboto mono", "droid sans mono", monospace;

    --fz: 16px;
    --bg-code: rgb(51 51 51 / 0.03);
    --c-red: #db7093;
    --c-red-dark: #d24b78;
    --c-gold: #fcb305;

    --c-body: #333;
    --c-body_rgb: 51 51 51;
    --bg-body: #fcfcfc;
    --p-sides-x: 1.5rem;
    --p-sides-y: 2rem;
    --c-link: var(--c-red);
    --c-primary: var(--c-red);

    --stripe-size: 0.5rem;

    --scrollbar-track: #eee;
    --scrollbar-thumb: #ccc;
    --scrollbar-size: 4px;
    --c-scrollbar: auto;

    --m-table-side: -1rem;

    /* syntax highlighting (atom one light) */
    --tok-fg: #383a42;
    --tok-comment: #a0a1a7;
    --tok-keyword: #a626a4;
    --tok-string: #50a14f;
    --tok-number: #986801;
    --tok-function: #4078f2;
    --tok-type: #c18401;
    --tok-builtin: #c18401;
    --tok-tag: #e45649;
    --tok-attr: #986801;
    --tok-variable: #e45649;
    --tok-meta: #4078f2;
    --tok-inserted: #50a14f;
    --tok-deleted: #e45649;
}

@media screen and (prefers-color-scheme: dark) {
    html:not(.light) {
        --c-body: #fefefe;
        --c-body_rgb: 254 254 254;
        --bg-body: #222;
        --bg-code: rgb(20 20 20 / 0.46);

        --scrollbar-track: #999;
        --scrollbar-thumb: #666;
        --c-scrollbar: rgb(128 128 128 / 0.5) rgb(0 0 0 / 0.5);

        /* syntax highlighting (night owl) */
        --tok-fg: #d6deeb;
        --tok-comment: #637777;
        --tok-keyword: #c792ea;
        --tok-string: #ecc48d;
        --tok-number: #f78c6c;
        --tok-function: #82aaff;
        --tok-type: #ffcb8b;
        --tok-builtin: #addb67;
        --tok-tag: #7fdbca;
        --tok-attr: #7fdbca;
        --tok-variable: #addb67;
        --tok-meta: #82aaff;
        --tok-inserted: #addb67;
        --tok-deleted: #ef5350;
    }
}

@media screen and (min-width: 600px) {
    :root {
        --fz: 18px;
        --p-sides-x: 2rem;
        --scrollbar-size: 6px;
        --m-table-side: 0;
    }
}

@media screen and (min-width: 900px) {
    :root {
        --fz: 20px;
        --p-sides-x: 4rem;
        --p-sides-y: 4rem;
    }
}

@media screen and (min-width: 1300px) {
    :root {
        --fz: 22px;
        --p-sides-x: 6rem;
        --p-sides-y: 4rem;
    }
}

/* base */

*,
*::before,
*::after {
    font-family: inherit;
    box-sizing: border-box;
}

html {
    scrollbar-width: thin;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font);
    word-break: break-word;
    font-size: var(--fz);
    line-height: 1.6;
    color: var(--c-body);
    background-color: var(--bg-body);
    border-top: var(--stripe-size) solid var(--c-primary);
    border-bottom: var(--stripe-size) solid var(--c-primary);
}

strong,
b {
    font-weight: 580;

    :is(h2, h3, h4, h5, h6):hover & {
        color: var(--c-red-dark);
    }
}

img,
video {
    max-width: calc(100vw - 2 * var(--p-sides-x) - 1rem);
    height: auto;
}

img {
    max-width: 100%;
    cursor: zoom-in;

    @media screen and (min-width: 1200px) {
        &.zoom {
            width: initial;
            max-width: none;
            max-height: calc(100vh - var(--p-sides-y));
            object-fit: contain;
            cursor: zoom-out;
        }
    }
}

video {
    width: 100%;

    @media screen and (min-width: 1200px) {
        &:hover,
        &:active,
        &:focus-within {
            width: initial;
            max-height: calc(100vh - var(--p-sides-y));
            object-fit: contain;
        }
    }
}

:is(h1, h2, h3, h4, h5, h6, .h1, .h2, .h3, .h4, .h5, .h6) {
    font-family: var(--font);
    line-height: 1.33;
    font-weight: 600;
    margin: 1em 0;
    scroll-margin-top: 1em;
}

:is(h1, .h1) {
    font-weight: 700;
    font-size: calc(1.5em + 0.5vw);

    &:first-child {
        margin-bottom: 1.5em;
    }

    &.title {
        color: var(--c-primary);
    }
}

:is(h2, .h2) {
    font-size: 1.5em;
}

:is(h3, .h3) {
    font-size: 1.333em;
}

:is(h4, .h4) {
    font-size: 1.25em;
}

:is(h5, .h5) {
    font-size: 1.125em;
}

:is(h6, .h6) {
    font-weight: 500;
    font-size: 1em;
}

a {
    color: var(--c-link);
    text-underline-offset: 0.166em;
    text-decoration-skip-ink: auto;

    :is(h1, h2, h3, h4, h5, h6) & {
        color: currentColor;
        text-decoration: none;
    }

    &:hover {
        color: var(--c-link);
    }
}

p {
    margin: 0 0 1em;

    &:only-child {
        margin: 0;
    }
}

thead th {
    text-align: left;
}

th {
    font-weight: 600;
}

input,
button {
    font-family: inherit;
    font-size: inherit;
}

input,
textarea {
    padding: 0.75rem 0.5rem;
    display: block;
    width: 100%;
    background-color: transparent;
    border: 1px solid rgb(102 102 102 / 0.5);
    color: currentColor;

    &:not(:placeholder-shown) {
        border-color: var(--c-link);
    }

    &:hover,
    &:focus {
        border-color: var(--c-link);
        outline: 0;
    }
}

label {
    display: block;
    width: 100%;
    margin-bottom: 0.5rem;
}

ul,
ol {
    padding: 0;
    margin: 1rem 0;
}

:is(ul, ol) :is(ul, ol) {
    padding-left: 1rem;
}

hr {
    margin: 2rem 0;
    border: 0;
    height: 1px;
    background-color: rgb(0 0 0 / 0.2);
    width: 33%;
}

cite {
    font-size: 0.8em;
    font-style: normal;
}

code,
pre {
    font-family: var(--font-mono);
}

code {
    background-color: var(--bg-code);
    padding: 0.2em;
    border-radius: 0.25em;

    pre & {
        --bg-code: transparent;
        padding: 0;
    }
}

kbd {
    font-weight: 550;
    padding: 0.2em 0.5em;
    border-radius: 0.5em;
    min-width: 2rem;
    background-color: rgb(var(--c-body_rgb) / 0.1);
}

table {
    margin: 1rem 0;
    border-spacing: 0.75rem 0.25rem;

    .table & {
        margin: 0;
        white-space: nowrap;
    }
}

blockquote {
    padding: 0 1rem 0;
    margin: 2rem 0;
    border-left: 2px solid var(--c-primary);
}

td {
    vertical-align: top;
}

details {
    margin: 2rem 0;
}

summary {
    font-weight: 600;
    margin-bottom: 1rem;
    cursor: pointer;
}

/* utilities */

.d--i {
    display: inline;
}

.d--ib {
    display: inline-block;
}

.flex-and-center {
    display: flex;
    align-items: center;
}

.mb--1 {
    margin-bottom: 0.5rem;
}

.mb--2 {
    margin-bottom: 1rem;
}

.mr--1 {
    margin-right: 0.5rem;
}

.c--primary {
    color: var(--c-primary);
}

.c--error {
    color: var(--c-red);
}

.text--dim {
    opacity: 0.5;
}

.text--bold {
    font-weight: 600;
}

.text--lowercase {
    text-transform: lowercase;
}

.text--narrow {
    letter-spacing: -1px;
}

small,
.text--small {
    font-size: 0.75em;
}

.link {
    text-decoration: none;
    color: currentColor;
}

.button {
    display: inline-block;
    padding: 1rem 1.5rem;
    background-color: var(--c-primary);
    color: white;
    border-radius: 10rem;
    font-size: 0.75em;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 2px;
    border: 0;
    appearance: none;
    cursor: pointer;
}

/* layout */

.page-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 60rem;
    margin-right: auto;
    padding: var(--p-sides-y) var(--p-sides-x);
}

.content {
    flex-grow: 1;
}

.single > h1:first-child {
    margin-top: 0;
}

.page-title {
    text-transform: lowercase;

    &::before {
        content: "/";
        color: var(--c-primary);
        margin-right: 0.25rem;
    }
}

.nav {
    margin-bottom: 2rem;
    color: var(--c-primary);
}

.nav__link {
    display: inline-block;
    padding: 0.25rem 0;
    margin-right: 1rem;
    font-size: 1em;
    font-weight: 700;
    color: var(--c-body);
}

.nav__link--home {
    color: var(--c-link);
}

.nav__link--darkmode {
    padding-left: 0.5rem;
    padding-right: 0.5rem;
    align-items: center;

    svg {
        width: auto;
        height: 1em;
    }
}

/* horizontal overflow: expands on hover */

.overflow,
.table,
pre {
    scrollbar-width: thin;
    scrollbar-color: var(--c-scrollbar);

    &.has-overflow:is(:hover, :active, :focus-within) {
        overflow-x: scroll;

        @media screen and (min-width: 1200px) {
            --width: calc(var(--scrollWidth) + 1rem);
            width: var(--width, var(--maxWidth));
            max-width: calc(100vw - 2 * var(--p-sides-x) - 1rem);
            --scrollbar-track: transparent;
            --scrollbar-thumb: transparent;
        }
    }

    &::-webkit-scrollbar {
        height: var(--scrollbar-size);
    }

    &::-webkit-scrollbar-track {
        background: var(--scrollbar-track);
    }

    &::-webkit-scrollbar-thumb {
        background-color: var(--scrollbar-thumb);
    }
}

.table {
    margin: 1rem var(--m-table-side);
    overflow-x: auto;
}

/* home */

.intro h1 {
    letter-spacing: -1px;
}

/* the page takes the field's paper colour so the canvas blends in */
body.home {
    --bg-body: #eeece5;
}

@media screen and (prefers-color-scheme: dark) {
    html:not(.light) body.home {
        --bg-body: #151d1c;
    }
}

.field {
    position: fixed;
    top: 0;
    left: 0;
    z-index: -1;
    width: 100%;
    height: min(90vh, 60rem);
    pointer-events: none;
    /* fade into the page below the hero */
    mask-image: linear-gradient(to bottom, #000 55%, transparent);
}

/* posts */

.single img {
    display: block;
    margin: 1rem 0;
}

.post {
    display: flex;
    flex-direction: column;

    & > h1 {
        order: -2;
    }

    & > .page__meta {
        order: -1;
    }

    & > * {
        order: 0;
    }
}

.post__content > * {
    position: relative;
}

.page__updated-at {
    margin: 1rem 0;
    font-size: 14px;
    opacity: 0.5;

    &:hover {
        opacity: 1;
    }

    .page--recently-updated &::before {
        content: "🌱";
    }
}

.tip {
    margin: 2rem -1rem;
    padding: 1rem;
    border: 1px solid limegreen;

    &::before {
        content: "tip";
        text-transform: uppercase;
        letter-spacing: 1px;
        display: block;
        font-weight: bold;
        font-size: 0.8em;
        color: limegreen;
        margin-bottom: 0.5rem;
    }
}

.download {
    padding: 1rem;
    margin: 2rem -1rem;
    border: 2px solid var(--c-primary);

    a {
        text-decoration: none;
    }

    ul {
        padding-left: 1.25rem;
    }

    & > *:last-child {
        margin-bottom: 0;
    }

    &::before {
        content: "download";
        text-transform: uppercase;
        letter-spacing: 1px;
        font-weight: bold;
        font-size: 0.75em;
        color: var(--c-primary);
        margin-bottom: 1rem;
        display: block;
    }
}

.tag {
    font-size: 0.75em;
    margin-right: 0.5rem;
    font-weight: 600;
    text-decoration: none;
}

.table-of-contents {
    padding: 1rem;
    margin: 2rem -1rem;
    font-weight: 600;
    background-color: rgb(0 0 128 / 0.03);

    &::before {
        content: "Table Of Contents";
        color: var(--c-primary);
        text-transform: uppercase;
        letter-spacing: 1px;
        font-weight: bold;
        margin-bottom: 1rem;
        display: block;
    }

    ul {
        list-style: none;
        margin: 0;
    }

    ul ul {
        list-style: inside;
    }

    a {
        text-decoration: none;
    }
}

.footnote-backref {
    font-family: var(--font-mono);
    text-decoration: none;
}

[id*="fnref"] {
    text-decoration: none;
}

.anchor {
    opacity: 0.25;
    width: 0;
    margin-left: 0.5rem;
    text-decoration: none;

    &::after {
        font-weight: normal;
        content: " ⚓\FE0E";
    }

    :is(h2, h3, h4, h5, h6):is(:hover, :focus-within) & {
        opacity: 1;
        color: var(--c-primary);
    }
}

.has-recommend {
    position: relative;
}

.recommend {
    margin: 1rem 0;
    font-weight: 600;
    border-left: 3px solid var(--c-primary);
    padding-left: 1rem;

    &::before {
        content: "Recommended";
        font-weight: 400;
        opacity: 0.5;
        margin-bottom: 1rem;
    }

    a {
        text-decoration: none;
        color: currentColor;
    }

    & > :first-child {
        margin-top: 0;
    }

    @media (min-width: 1300px) {
        margin: 0 0 0 1rem;
        top: 0;
        left: 100%;
        position: absolute;
        width: 50%;
    }
}

/* code blocks */

pre {
    position: relative;
    z-index: 0;

    overflow-x: auto;
    white-space: pre;
    word-break: keep-all;

    margin-left: -1rem;
    margin-right: -1rem;
    padding: 1rem !important;
    background-color: var(--bg-code);
    color: var(--tok-fg);

    &::before {
        content: attr(data-lang);
        display: inline-block;
        line-height: 1;
        text-transform: uppercase;
        letter-spacing: 1px;
        font-size: 0.6em;
        font-weight: 600;
        position: absolute;
        top: 0.5rem;
        right: 0.5rem;
        z-index: 1;
        opacity: 0;
    }

    &:hover::before {
        opacity: 0.5;
    }
}

/* chroma token classes (prefix z-)
   kopkop injects code-github.css after this stylesheet, hence the extra
   specificity from `pre.z-chroma` */

pre.z-chroma {
    background-color: var(--bg-code);
    color: var(--tok-fg);

    .z-err {
        color: inherit;
        background-color: transparent;
    }

    .z-n,
    .z-nx,
    .z-o,
    .z-ow,
    .z-p {
        color: var(--tok-fg);
    }

    /* keywords */
    .z-k,
    .z-kc,
    .z-kd,
    .z-kn,
    .z-kp,
    .z-kr {
        color: var(--tok-keyword);
    }

    .z-kt,
    .z-nc,
    .z-no,
    .z-ne,
    .z-nn {
        color: var(--tok-type);
    }

    /* names */
    .z-nb,
    .z-bp {
        color: var(--tok-builtin);
    }

    .z-nf,
    .z-fm {
        color: var(--tok-function);
    }

    .z-nt {
        color: var(--tok-tag);
    }

    .z-na,
    .z-py {
        color: var(--tok-attr);
    }

    .z-nv,
    .z-vc,
    .z-vg,
    .z-vi,
    .z-vm {
        color: var(--tok-variable);
    }

    .z-nd,
    .z-nl,
    .z-ni {
        color: var(--tok-meta);
    }

    /* literals */
    .z-s,
    .z-sa,
    .z-sb,
    .z-sc,
    .z-dl,
    .z-sd,
    .z-s2,
    .z-se,
    .z-sh,
    .z-si,
    .z-sx,
    .z-sr,
    .z-s1,
    .z-ss {
        color: var(--tok-string);
    }

    .z-m,
    .z-mb,
    .z-mf,
    .z-mh,
    .z-mi,
    .z-il,
    .z-mo,
    .z-l,
    .z-ld {
        color: var(--tok-number);
    }

    /* comments */
    .z-c,
    .z-ch,
    .z-cm,
    .z-c1,
    .z-cs,
    .z-cp,
    .z-cpf {
        color: var(--tok-comment);
        font-style: italic;
    }

    /* generic */
    .z-gi {
        color: var(--tok-inserted);
    }

    .z-gd,
    .z-gr {
        color: var(--tok-deleted);
    }

    .z-ge {
        font-style: italic;
    }

    .z-gs {
        font-weight: bold;
    }

    .z-gh,
    .z-gu {
        color: var(--tok-function);
        font-weight: bold;
    }
}