/*
 * Slate and signal.
 *
 * One accent, and it means the same thing everywhere: this is live, or this is the thing you
 * came for. Slate carries everything else, so the green is never decoration. Archivo sets the
 * prose, IBM Plex Mono every name the engine knows, and nothing that is not a name is set in
 * mono, so a monospaced word on this site is always something you can type at the engine.
 */

:root {
  color-scheme: dark;

  --ground: #1c1f26;
  --raised: #232730;
  --sunken: #14171c;
  --rule: #2a2f39;
  --rule-soft: #242832;

  --ink: #f2f4f8;
  --body: #cfd4dd;
  --muted: #8d95a3;
  --faint: #767e8b;

  --signal: #57d98a;
  --signal-ink: #0f2a1b;
  --warn: #e8b04b;

  --sans: "Archivo", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --gutter: clamp(20px, 4vw, 40px);
  /*
   * One width, for everything, on every page: the header bar, the content under it, the front
   * page's cards, the footer. There were five of these, and `ch` was one of them, which resolves
   * against each element's own font size: a heading's rule, the table beside it and the paragraph
   * under it all stopped in three different places on the same page, and the front page and the
   * rest read as two different sites. Narrow enough that a line of prose filling it is still a
   * line somebody can read, so nothing needs a second, narrower width of its own.
   */
  --frame: 880px;
}

@media (prefers-color-scheme: light) {
  :root {
    color-scheme: light;

    --ground: #f7f7f5;
    --raised: #ffffff;
    --sunken: #ecedea;
    --rule: #dcdedb;
    --rule-soft: #e6e7e4;

    --ink: #14171c;
    --body: #33383f;
    --muted: #5c636d;
    --faint: #737a85;

    --signal: #12784a;
    --signal-ink: #eaf7ef;
  }
}

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

body {
  margin: 0;
  background: var(--ground);
  color: var(--body);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--signal);
  color: var(--signal-ink);
  padding: 10px 16px;
  z-index: 10;
}

.skip:focus {
  left: 0;
}

a {
  color: var(--ink);
  text-decoration-color: color-mix(in srgb, var(--signal) 55%, transparent);
  text-underline-offset: 3px;
}

a:hover {
  text-decoration-color: var(--signal);
}

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

/* ------------------------------------------------------------------ chrome */

.top {
  border-bottom: 1px solid var(--rule);
}

.top > .bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px 24px;
  flex-wrap: wrap;
  max-width: var(--frame);
  margin: 0 auto;
  padding: 16px var(--gutter);
}

.wordmark {
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
}

/* The signal, on the one element that stands for the project itself. */
.wordmark::after {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--signal);
  margin-left: 7px;
  vertical-align: 0.18em;
}

.links {
  display: flex;
  gap: 18px;
  font-size: 14px;
  color: var(--muted);
}

.links a {
  color: var(--muted);
  text-decoration: none;
}

.links a:hover {
  color: var(--ink);
}

.links a.on {
  color: var(--signal);
  font-weight: 500;
}

/* The two that leave the site, kept together and marked as leaving it. */
.links .off {
  width: 1px;
  height: 15px;
  background: var(--rule);
}

.links a.out::after {
  content: " \2197";
  color: var(--faint);
}

main {
  max-width: var(--frame);
  margin: 0 auto;
  padding: 28px var(--gutter) 80px;
  min-width: 0;
}

.foot {
  border-top: 1px solid var(--rule);
}

.foot > .bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  max-width: var(--frame);
  margin: 0 auto;
  padding: 18px var(--gutter);
  font-family: var(--mono);
  font-size: 12px;
  color: var(--faint);
}

@media (max-width: 560px) {
  .links {
    gap: 8px 14px;
    flex-wrap: wrap;
  }
}

/* ------------------------------------------------------------------ prose */

h1,
h2,
h3,
h4 {
  color: var(--ink);
  letter-spacing: -0.025em;
  text-wrap: balance;
  margin: 0;
}

h1 {
  font-size: clamp(30px, 4.4vw, 38px);
  font-weight: 700;
  line-height: 1.12;
  margin-bottom: 18px;
}

h2 {
  font-size: 23px;
  font-weight: 600;
  line-height: 1.25;
  margin-top: 44px;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule);
}

h3 {
  font-size: 17px;
  font-weight: 600;
  margin-top: 30px;
  margin-bottom: 10px;
}

h4 {
  font-size: 15px;
  font-weight: 600;
  margin-top: 22px;
  margin-bottom: 8px;
}

p,
ul,
ol {
  margin: 0 0 16px;
}

ul,
ol {
  padding-left: 22px;
}

li {
  margin-bottom: 6px;
}

li::marker {
  color: var(--faint);
}

strong {
  color: var(--ink);
  font-weight: 600;
}

.lede {
  font-size: 17.5px;
  line-height: 1.6;
  color: var(--body);
}

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 36px 0;
}

blockquote {
  margin: 0 0 16px;
  padding: 2px 0 2px 18px;
  border-left: 3px solid var(--signal);
  color: var(--muted);
}

/* ------------------------------------------------------------------ code */

code {
  font-family: var(--mono);
  font-size: 0.875em;
  color: var(--ink);
  background: var(--sunken);
  border: 1px solid var(--rule-soft);
  border-radius: 3px;
  padding: 0.08em 0.34em;
  /*
   * Never broken across lines. A flag or a path split in the middle of a word reads as two
   * different things, and in a narrow table cell every one of them was being split. A cell too
   * narrow for its content is the table's problem to solve, not the word's.
   */
  white-space: nowrap;
}

/*
 * A code block is a figure, with the caption the fence's info string carries. Browsers indent a
 * figure by 40px of their own, which put every block on the site one step to the right of the
 * prose above it.
 */
figure {
  margin: 0 0 18px;
}

/*
 * One label, wherever something small and quiet names the thing under it: a code block's caption,
 * a table's column, a card's kicker, a step on the front page. They were four near-identical
 * rules at three sizes and two families, which is the sort of difference a reader cannot name
 * but can see.
 */
figcaption,
th,
.card .kicker,
.step {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--faint);
}

figcaption {
  margin-bottom: 8px;
}

pre {
  margin: 0 0 18px;
  padding: 15px 17px;
  background: var(--sunken);
  border: 1px solid var(--rule);
  border-radius: 4px;
  max-width: 100%;
}

figure > pre {
  margin-bottom: 0;
}

pre code {
  font-size: 13px;
  /*
   * Tight, because a diagram drawn out of characters only reads as one when the lines are close
   * enough for its verticals to join up. At the 1.62 prose uses, a tree came apart into a column
   * of loose pipes with daylight between them.
   */
  line-height: 1.4;
  background: none;
  border: 0;
  padding: 0;
  color: var(--body);
  /*
   * Wrapped, never scrolled. A block that slides sideways hides half of itself behind a gesture
   * nobody makes, and on a phone every block would be one. The documents are written to fit the
   * column instead, so this is the guard rather than the everyday behaviour.
   */
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

/* ------------------------------------------------------------------ tables */

.scroll {
  overflow-x: auto;
  max-width: 100%;
  margin-bottom: 18px;
}

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 14px;
}

th {
  text-align: left;
  padding: 0 14px 8px 0;
  border-bottom: 1px solid var(--rule);
}

td {
  padding: 9px 14px 9px 0;
  border-bottom: 1px solid var(--rule-soft);
  vertical-align: top;
}

td:last-child,
th:last-child {
  padding-right: 0;
}

/* ------------------------------------------------------------------ the flow */

/*
 * One command in, three ways out, one thing at the end.
 *
 * Drawn in elements rather than in characters. As ASCII art in a code block it came apart twice:
 * the box-drawing glyphs are not in the mono face, so the browser found them in some other font
 * at some other width, and even once it was plain ASCII the verticals could not join across the
 * line height code is set at. Here the rules are elements, placed exactly, in the theme, and the
 * whole thing stacks into a column on a narrow screen instead of overflowing.
 */
.flow {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0 0 20px;
}

.flow p {
  margin: 0;
  text-align: center;
}

code.cmd {
  font-size: 14px;
  padding: 8px 14px;
  color: var(--signal);
  border-color: color-mix(in srgb, var(--signal) 45%, transparent);
}

/* The stem out of the command, and the one into the line at the end. */
.flow .start::after,
.flow .end::before {
  content: "";
  display: block;
  width: 1px;
  height: 24px;
  margin: 0 auto;
  background: var(--rule);
}

.flow .fan {
  position: relative;
  width: 100%;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  /* The stem zone above and below, inside the box, so the bars have somewhere to sit. */
  padding: 24px 0;
}

/* The two bars, drawn centre to centre of the outer lanes rather than edge to edge. */
.flow .fan::before,
.flow .fan::after {
  content: "";
  position: absolute;
  left: calc(100% / 6);
  right: calc(100% / 6);
  height: 1px;
  background: var(--rule);
}

.flow .fan::before {
  top: 0;
}

.flow .fan::after {
  bottom: 0;
}

.flow .lane {
  position: relative;
  border: 1px solid var(--rule);
  border-radius: 10px;
  background: var(--raised);
  padding: 14px 16px;
}

/* Each lane's own stem, up to the first bar and down to the second. */
.flow .lane::before,
.flow .lane::after {
  content: "";
  position: absolute;
  left: 50%;
  width: 1px;
  height: 24px;
  background: var(--rule);
}

.flow .lane::before {
  top: -24px;
}

.flow .lane::after {
  bottom: -24px;
}

.flow .when {
  margin-bottom: 8px;
  text-align: left;
  color: var(--ink);
  font-size: 13.5px;
  font-weight: 600;
}

.flow .then {
  text-align: left;
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--muted);
}

.flow .end {
  font-size: 13px;
  color: var(--faint);
}

@media (max-width: 720px) {
  .flow .fan {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  /* Stacked, the bars have nothing to span and each lane hangs off the one above it. */
  .flow .fan::before,
  .flow .fan::after,
  .flow .lane:first-child::before,
  .flow .lane:last-child::after {
    display: none;
  }

  .flow .lane::before {
    top: -24px;
    height: 24px;
  }

  .flow .lane::after {
    display: none;
  }
}

/* ------------------------------------------------------------------ the tool reference */

.tool {
  margin: 0 0 34px;
  padding-left: 16px;
  border-left: 2px solid var(--rule);
}

.tool:target,
.tool:hover {
  border-left-color: var(--signal);
}

.tool h3 {
  margin-top: 0;
}

.tool h3 code {
  background: none;
  border: 0;
  padding: 0;
  font-size: 1em;
  color: var(--ink);
}

.tool .needs {
  color: var(--muted);
  font-size: 14px;
}

.tag {
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--signal);
  border: 1px solid color-mix(in srgb, var(--signal) 40%, transparent);
  border-radius: 2px;
  padding: 1px 5px;
  vertical-align: 1px;
}

details {
  margin-bottom: 10px;
}

summary {
  cursor: pointer;
  color: var(--muted);
  font-size: 14px;
  font-family: var(--mono);
}

summary:hover {
  color: var(--ink);
}

.args {
  margin: 12px 0 0;
  display: grid;
  grid-template-columns: minmax(120px, max-content) 1fr;
  gap: 6px 18px;
  font-size: 14px;
}

.args dt {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink);
}

.args dt code {
  background: none;
  border: 0;
  padding: 0;
  font-size: 1em;
}

.args dd {
  margin: 0;
  color: var(--muted);
}

.args .type {
  color: var(--faint);
  font-size: 11px;
}

@media (max-width: 560px) {
  .args {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .args dd {
    margin-bottom: 10px;
  }
}

/*
 * The front page. A statement, the two ways in, and three cards that route you onward. Same
 * width as every other page, because it is the same site; what differs is that this one is
 * looked at rather than read, so it opens on a hero instead of a heading.
 */

.home main {
  padding: 0 var(--gutter) 64px;
}

.hero {
  padding: 60px 0 6px;
}

.hero h1 {
  font-size: clamp(38px, 6vw, 52px);
  font-weight: 700;
  line-height: 1.08;
  margin: 0 0 18px;
}

.hero .sub {
  font-size: 18.5px;
  line-height: 1.55;
  color: var(--body);
  margin: 0;
}

.install {
  padding-bottom: 34px;
}

.step {
  margin: 30px 0 10px;
}

.install .step:first-child {
  margin-top: 0;
}

.note {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--muted);
  margin: 10px 0 0;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  padding: 34px 0 40px;
}

.card {
  background: var(--raised);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
}

.card .kicker {
  margin-bottom: 9px;
}

.card h3 {
  margin: 0 0 7px;
  font-size: 16px;
  font-weight: 600;
}

.card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--muted);
  flex: 1;
}

.card .go {
  margin-top: 14px;
  font-size: 13px;
  color: var(--signal);
  text-decoration: none;
}

/*
 * The escape rather than the character. A literal arrow here was mangled into a control byte by
 * a tool that wrote this file once already, and it rendered as a tofu box on the live site for
 * as long as nobody looked; an escape is plain ASCII and cannot be damaged that way.
 */
.card .go::after {
  content: " \2192";
}

.card .go:hover {
  text-decoration: underline;
}

.smallprint {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--faint);
  margin: 0;
}

/*
 * The install picker: radio inputs, sibling selectors, no script. The inputs sit before the chips
 * and the panels so that a :checked sibling selector can reach both, and are taken out of the flow
 * rather than hidden, because display:none takes them out of the keyboard order with it.
 */

.picker {
  border: 1px solid var(--rule);
  border-radius: 10px;
  background: var(--raised);
  margin: 0;
}

.picker > input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.picker .chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--rule);
}

.picker label {
  font-size: 13px;
  padding: 6px 12px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  color: var(--muted);
  cursor: pointer;
}

.picker label:hover {
  color: var(--ink);
  border-color: var(--faint);
}

.picker .panel {
  display: none;
  padding: 16px;
}

/*
 * The same code block as everywhere else, in the accent: this one is the command the reader came
 * for, which is what the accent is reserved for. Everything about its shape stays shared, so it
 * reads as the same object emphasised rather than as a second kind of code block.
 */
.picker .panel pre {
  margin: 0 0 10px;
}

.picker .panel pre code {
  color: var(--signal);
}

.picker .panel p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--muted);
}

.picker .panel p code {
  color: var(--body);
}

@media (max-width: 820px) {
  .cards {
    grid-template-columns: 1fr;
  }
}