/* Irie's site. One stylesheet, no build step, no web fonts.
   Irie's colours come from internal/ui/view.go. The page follows the
   system's light or dark setting; terminal pictures stay dark in both. */

:root {
  color-scheme: light dark;

  /* Irie's colours (internal/ui/view.go) */
  --sun: #F2B544;
  --deep-green: #1E5A42;
  --on-green: #EAF6EF;
  --rule-green: #3D5247;
  --sea: #2E9E77;
  --deep-sea: #1D7357;

  /* Light theme. Sun is too light for text here, so it only decorates. */
  --bg: #FCFCF8;
  --bg-soft: #EAF6EF;
  --ink: #14261D;
  --ink-soft: #4A5E54;
  --line: #D3E2D9;
  --line-strong: #6E8879;
  --link: #1E5A42;
  --link-hover: #1D7357;
  --mark: #1E5A42;
  --done: #1E5A42;
  --done-ink: #EAF6EF;
  --button: #1E5A42;
  --button-ink: #EAF6EF;
  --focus: #1D7357;
  --code-bg: #E3EFE7;

  /* Terminal pictures, the same in both themes. The red, green, yellow
     and cyan stand in for the terminal's own palette. */
  --term-bg: #0B1310;
  --term-bar: #18241E;
  --term-frame: #2C3D34;
  --term-title: #B9C9C0;
  --term-ink: #DDE9E2;
  --term-faint: #8C9E94;
  --term-red: #FF6E64;
  --term-green: #57D08C;
  --term-yellow: #E8C04F;
  --term-cyan: #4CC9DB;
  --term-age-on-green: #C2D8CB;

  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", "DejaVu Sans Mono", monospace;

  --page: 62rem;
  --measure: 40rem;
  --gutter: 1.25rem;
  --radius: 14px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0D1713;
    --bg-soft: #15221C;
    --ink: #EAF6EF;
    --ink-soft: #A7BBB0;
    --line: #2C3D34;
    --line-strong: #5E7A6B;
    --link: #F2B544;
    --link-hover: #F7CD7A;
    --mark: #F2B544;
    --done: #2E9E77;
    --done-ink: #0D1713;
    --button: #F2B544;
    --button-ink: #10231A;
    --focus: #F2B544;
    --code-bg: #1B2B23;
  }
}

/* Base */

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

html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.6;
}

h1, h2, h3 { line-height: 1.2; margin: 0; text-wrap: balance; }
h1 { font-size: clamp(1.9rem, 1.1rem + 3.2vw, 3rem); letter-spacing: -0.015em; }
h2 { font-size: clamp(1.35rem, 1.1rem + 1vw, 1.65rem); margin-top: 3rem; }
h3 { font-size: 1.15rem; margin-top: 1.75rem; }
p, ul, ol, dl { margin: 0.75rem 0 0; }
p, li { max-width: var(--measure); }

a { color: var(--link); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { color: var(--link-hover); text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 4px; }

code, kbd {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--code-bg);
  border-radius: 6px;
  padding: 0.08em 0.35em;
  overflow-wrap: anywhere;
}
kbd { border: 1px solid var(--line-strong); border-bottom-width: 2px; }

dfn { font-style: normal; font-weight: 650; }

/* Page frame */

.skip {
  position: absolute;
  left: var(--gutter);
  top: -3rem;
  z-index: 1;
  padding: 0.5rem 0.9rem;
  background: var(--button);
  color: var(--button-ink);
  border-radius: 8px;
}
.skip:focus { top: 0.75rem; }

.site-header,
main,
.site-footer {
  max-width: calc(var(--page) + 2 * var(--gutter));
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-top: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--ink);
  font-weight: 750;
  font-size: 1.3rem;
  text-decoration: none;
}
.brand:hover { color: var(--ink); }
.brand svg { width: 2rem; height: 2rem; flex: none; }

.site-header ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-header nav a {
  display: inline-block;
  padding: 0.3rem 0;
  color: var(--ink);
  font-size: 0.98rem;
  text-decoration: none;
  border-bottom: 3px solid transparent;
}
.site-header nav a:hover { border-bottom-color: var(--line-strong); }
.site-header nav a[aria-current="page"],
.site-header nav a[aria-current="true"] { border-bottom-color: var(--sun); font-weight: 650; }

main { padding-top: 2.5rem; padding-bottom: 4rem; }

.site-footer {
  padding-top: 1.5rem;
  padding-bottom: 2.5rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.95rem;
}
.site-footer p { margin: 0.35rem 0 0; }

/* Pictures */

.picture { margin: 1.75rem 0 0; }
.picture svg { display: block; width: 100%; height: auto; }
.picture figcaption {
  margin: 0.8rem auto 0;
  max-width: var(--measure);
  color: var(--ink-soft);
  font-size: 0.95rem;
  text-align: center;
}
.picture.narrow svg { max-width: 34rem; margin: 0 auto; }
.picture.small svg { max-width: 26rem; margin: 0 auto; }

/* The Irie window. On narrow screens it crops to the sidebar and the
   start of the slot, so its text stays readable. */
.window { aspect-ratio: 940 / 356; }
.window svg { width: 100%; height: 100%; }
@media (max-width: 47.5rem) {
  .window {
    aspect-ratio: 640 / 356;
    -webkit-mask-image: linear-gradient(90deg, #000 82%, transparent);
    mask-image: linear-gradient(90deg, #000 82%, transparent);
  }
}
@media (max-width: 32.5rem) {
  .window { aspect-ratio: 400 / 356; }
}

/* SVG paint, so pictures follow the theme */
svg { font-family: var(--sans); }
svg .mono { font-family: var(--mono); }
.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }

.s-bg { fill: var(--bg); }
.s-card { fill: var(--bg-soft); }
.s-ink { fill: var(--ink); color: var(--ink); }
.s-soft { fill: var(--ink-soft); color: var(--ink-soft); }
.s-mark { fill: var(--mark); color: var(--mark); }
.s-sun { fill: var(--sun); color: var(--sun); }
.s-sea { fill: var(--sea); color: var(--sea); }
.s-deep-sea { fill: var(--deep-sea); color: var(--deep-sea); }
.s-green { fill: var(--deep-green); color: var(--deep-green); }
.s-on-green { fill: var(--on-green); color: var(--on-green); }
.s-done { fill: var(--done); color: var(--done); }
.s-done-ink { fill: var(--done-ink); color: var(--done-ink); }
.s-stroke-done-ink { stroke: var(--done-ink); }
.s-line { stroke: var(--line-strong); }
.s-edge { stroke: var(--line); }
.s-stroke-ink { stroke: var(--ink); }
.s-stroke-soft { stroke: var(--ink-soft); }
.s-stroke-mark { stroke: var(--mark); }
.s-stroke-sun { stroke: var(--sun); }
.s-stroke-sea { stroke: var(--sea); }
.s-stroke-deep-sea { stroke: var(--deep-sea); }

.t-bg { fill: var(--term-bg); }
.t-bar { fill: var(--term-bar); }
.t-frame { stroke: var(--term-frame); }
.t-dot { fill: var(--term-frame); }
.t-title { fill: var(--term-title); }
.t-ink { fill: var(--term-ink); color: var(--term-ink); }
.t-faint { fill: var(--term-faint); color: var(--term-faint); }
.t-red { fill: var(--term-red); color: var(--term-red); }
.t-green { fill: var(--term-green); color: var(--term-green); }
.t-yellow { fill: var(--term-yellow); color: var(--term-yellow); }
.t-cyan { fill: var(--term-cyan); color: var(--term-cyan); }
.t-sun { fill: var(--sun); color: var(--sun); }
.t-on-green { fill: var(--on-green); color: var(--on-green); }
.t-age-on-green { fill: var(--term-age-on-green); }
.t-deep-green { fill: var(--deep-green); }
.t-rule { stroke: var(--rule-green); }

/* Home */

.lead { font-size: 1.2rem; color: var(--ink-soft); }
.hero .definition { margin: 0 0 1.75rem; }
.hero hgroup { margin: 0; }
.tagline { margin: 0 0 0.6rem; color: var(--mark); font-size: 1.15rem; font-weight: 700; text-wrap: balance; }
.hero h1 { max-width: 22ch; }
.hero .actions { margin-top: 1.5rem; }

.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.25rem; }
.button {
  display: inline-block;
  padding: 0.7rem 1.3rem;
  border: 2px solid var(--button);
  border-radius: 999px;
  background: var(--button);
  color: var(--button-ink);
  font-weight: 650;
  text-decoration: none;
}
.button:hover { color: var(--button-ink); filter: brightness(1.08); text-decoration: none; }
.button.quiet { background: transparent; color: var(--link); }
.button.quiet:hover { color: var(--link-hover); background: var(--bg-soft); filter: none; }

.note {
  margin-top: 1.5rem;
  padding: 0.75rem 1rem;
  max-width: var(--measure);
  border-left: 4px solid var(--sun);
  background: var(--bg-soft);
  border-radius: 0 10px 10px 0;
}

.reasons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 22rem), 1fr));
  gap: 1rem;
  margin-top: 1.25rem;
  padding: 0;
  list-style: none;
}
.reasons li {
  max-width: none;
  padding: 1.25rem 1.25rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-soft);
}
.reasons h3 { margin: 0; }
.reasons h3::before {
  content: "";
  display: block;
  width: 2.25rem;
  height: 4px;
  margin-bottom: 0.75rem;
  border-radius: 2px;
  background: var(--sun);
}
.reasons .status { font-size: 0.95rem; color: var(--ink-soft); }

/* Status marks: what works on main today, and what is planned */

.tag {
  display: inline-block;
  margin-right: 0.35rem;
  padding: 0.05rem 0.6rem;
  border: 1px solid var(--ink-soft);
  border-radius: 999px;
  color: var(--ink-soft);
  font-size: 0.8rem;
  font-weight: 650;
  line-height: 1.5;
  white-space: nowrap;
  text-decoration: none;
  vertical-align: 0.1em;
}
a.tag:hover { color: var(--ink); border-color: var(--ink); text-decoration: none; }
.tag.built { border-color: var(--done); background: var(--done); color: var(--done-ink); }
.tag.next { border-color: var(--sun); background: var(--sun); color: #14261D; }
h2 .tag, h3 .tag { font-size: 0.8rem; margin-left: 0.4rem; }

/* Recording boxes: empty for now, at the size the recordings will be */

.demo { margin: 2rem 0 0; }
.demos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 22rem), 1fr));
  gap: 0 1.5rem;
  max-width: 52rem;
}
.demo-box {
  aspect-ratio: 16 / 10;
  max-width: 42rem;
  border: 2px dashed var(--line-strong);
  border-radius: var(--radius);
  background: var(--bg-soft);
}
.demo figcaption {
  max-width: 42rem;
  margin-top: 0.6rem;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* Steps (Get started) */

.steps { counter-reset: step; list-style: none; padding: 0; margin-top: 1.25rem; }
.steps > li {
  counter-increment: step;
  position: relative;
  padding-left: 3.25rem;
  margin-top: 1.5rem;
}
.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: -0.1rem;
  width: 2.3rem;
  height: 2.3rem;
  border-radius: 50%;
  background: var(--deep-green);
  color: var(--on-green);
  font-weight: 750;
  line-height: 2.3rem;
  text-align: center;
}
.steps h3 { margin: 0; }

.needs { padding-left: 1.25rem; }
.needs li { margin-top: 0.4rem; }

.spawn-parts { margin-top: 1rem; }
.spawn-parts dt { margin-top: 1.25rem; font-weight: 650; }
.spawn-parts dt code { margin-right: 0.35rem; }
.spawn-parts dd { margin: 0.35rem 0 0; max-width: var(--measure); }

/* State list (How it works) */

.states-layout {
  display: grid;
  grid-template-columns: minmax(0, 22rem) minmax(0, 1fr);
  gap: 1.5rem 2.5rem;
  align-items: start;
  margin-top: 1.75rem;
}
.states-layout .picture { margin: 0; }
@media (max-width: 47.5rem) {
  .states-layout { grid-template-columns: minmax(0, 1fr); }
  .states-layout .picture svg { max-width: 22rem; margin: 0 auto; }
}

.states { margin: 0; padding: 0; list-style: none; }
.states li { display: flex; gap: 0.75rem; align-items: baseline; margin-top: 0.55rem; }
.states li:first-child { margin-top: 0; }
.glyph {
  flex: none;
  display: inline-block;
  min-width: 2.1rem;
  padding: 0 0.4rem;
  border-radius: 6px;
  background: var(--term-bg);
  font-family: var(--mono);
  font-weight: 700;
  line-height: 1.6;
  text-align: center;
}
.glyph.red { color: var(--term-red); }
.glyph.green { color: var(--term-green); }
.glyph.yellow { color: var(--term-yellow); }
.glyph.cyan { color: var(--term-cyan); }
.glyph.ink { color: var(--term-ink); }
.glyph.faint { color: var(--term-faint); }

/* Roadmap */

.milestones { list-style: none; padding: 0; margin-top: 1.25rem; }
.milestones > li {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  gap: 0 1rem;
  max-width: 46rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}
.milestones > li:first-child { border-top: 1px solid var(--line); }
.milestones > li > :not(.num) { grid-column: 2; }
.milestones .num {
  grid-row: span 2;
  width: 2.4rem;
  height: 2.4rem;
  border: 2px solid var(--ink-soft);
  border-radius: 50%;
  color: var(--ink-soft);
  font-weight: 750;
  line-height: 2.1rem;
  text-align: center;
}
.milestones .done .num { border-color: var(--done); background: var(--done); color: var(--done-ink); }
.milestones .now .num { border-color: #14261D; background: var(--sun); color: #14261D; }
.milestones h3 { margin: 0.35rem 0 0; font-size: 1.1rem; }
.milestones h3 .tag { margin-left: 0.5rem; }
.milestones p { margin-top: 0.35rem; }

.after { padding-left: 1.25rem; }
.after li { margin-top: 0.5rem; }

/* FAQ and Contribute */

/* The definition from the README, word for word (docs/PHRASES.md) */
.definition {
  margin: 1rem 0 0;
  padding: 0.75rem 1.1rem;
  max-width: var(--measure);
  border-left: 4px solid var(--sun);
  background: var(--bg-soft);
  border-radius: 0 10px 10px 0;
}
.definition p { margin: 0.15rem 0 0; }
.definition p:first-child { margin-top: 0; }

.qa h2 { font-size: 1.25rem; margin-top: 2.25rem; }
.rules { padding-left: 1.25rem; }
.rules li { margin-top: 0.6rem; }

.links { padding-left: 1.25rem; }
.links li { margin-top: 0.35rem; }

/* Docs */

/* Commands and files. They scroll sideways rather than wrap, so a
   command can be copied as it is. */
pre {
  margin: 0.9rem 0 0;
  padding: 0.8rem 1rem;
  max-width: 46rem;
  overflow-x: auto;
  background: var(--code-bg);
  border-radius: 10px;
  font-family: var(--mono);
  font-size: 0.88rem;
  line-height: 1.55;
}
pre code { padding: 0; background: none; border-radius: 0; font-size: inherit; overflow-wrap: normal; }
.prompt { color: var(--ink-soft); user-select: none; }

.table-wrap { margin-top: 1rem; max-width: 52rem; overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.97rem; line-height: 1.5; }
caption { padding-bottom: 0.4rem; color: var(--ink-soft); font-size: 0.95rem; text-align: left; }
th, td { padding: 0.5rem 1rem 0.5rem 0; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { border-bottom: 2px solid var(--line-strong); font-weight: 650; }
td code, th code { white-space: nowrap; }
td .tag { margin-top: 0.2rem; }

.doc h2 { scroll-margin-top: 1rem; }
.doc h3 { font-size: 1.08rem; }
.doc ul.rules, .doc ol.rules { max-width: var(--measure); }

/* The list of docs pages, on the docs index */
.doc-list { margin-top: 1.25rem; padding: 0; list-style: none; counter-reset: doc; max-width: 46rem; }
.doc-list > li {
  counter-increment: doc;
  position: relative;
  padding: 0.9rem 0 0.9rem 3.25rem;
  border-bottom: 1px solid var(--line);
}
.doc-list > li:first-child { border-top: 1px solid var(--line); }
.doc-list > li::before {
  content: counter(doc);
  position: absolute;
  left: 0;
  top: 0.9rem;
  width: 2.3rem;
  height: 2.3rem;
  border-radius: 50%;
  background: var(--done);
  color: var(--done-ink);
  font-weight: 750;
  line-height: 2.3rem;
  text-align: center;
}
.doc-list > li.planned::before { border: 2px solid var(--ink-soft); background: transparent; color: var(--ink-soft); line-height: calc(2.3rem - 4px); }
.doc-list h2 { margin: 0.2rem 0 0; font-size: 1.15rem; }
.doc-list p { margin-top: 0.3rem; }

/* At the foot of each docs page: the next page, then all of them */
.docs-nav {
  margin-top: 3.5rem;
  padding: 1.1rem 1.25rem 1.2rem;
  max-width: 46rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-soft);
}
.docs-nav .next { margin: 0; font-weight: 650; }
.docs-nav .next a { font-size: 1.1rem; }
.docs-nav ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 1.25rem;
  margin: 0.9rem 0 0;
  padding: 0.9rem 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}
.docs-nav li { max-width: none; }
.docs-nav a[aria-current="page"] { color: var(--ink); font-weight: 650; text-decoration: none; }

/* Themes. Each picture carries its theme's own colours, so it looks the
   same in the site's light and dark. */
svg .rounded { font-family: ui-rounded, "SF Pro Rounded", var(--sans); }
.pair {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr));
  gap: 0 1.5rem;
  max-width: 44rem;
}
.pair .picture svg { max-width: 21rem; margin: 0 auto; }
.colours { margin-top: 1.25rem; max-width: 44rem; }
.colours summary { cursor: pointer; color: var(--link); font-weight: 650; }
.colours .role { display: block; color: var(--ink-soft); font-size: 0.85rem; font-weight: 400; }
.colours td { white-space: nowrap; }
.sw { width: 0.9rem; height: 0.9rem; margin-right: 0.4rem; vertical-align: -0.1rem; }

@media (max-width: 32.5rem) {
  :root { --gutter: 1rem; }
  body { font-size: 1rem; }
  main { padding-top: 1.75rem; }
  .lead { font-size: 1.1rem; }
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}