/* PIU landing
   Display: Anybody, on its width axis, for the name and headlines.
   Body: Petrona, a manual serif.
   Utility: Martian Mono, for field names, paths, and commands.
   Canopy #16382E  Specimen #E7EFE6  Slip #F7FBF4  Carbon #121A16
   Fern #3E5248    Ticket #E7F25A (equals stamp and the primary Copy only)
   Graph #7EB8A2 (the captured-variable node only)
*/

:root {
  --canopy: #16382e;
  --canopy-deep: #0e241e;
  --specimen: #e7efe6;
  --slip: #f7fbf4;
  --carbon: #121a16;
  --fern: #3e5248;
  --line: #b7c7bb;
  --ticket: #e7f25a;
  --graph: #7eb8a2;
  --display: "Anybody", "Avenir Next", "Arial Narrow", sans-serif;
  --body: "Petrona", "Iowan Old Style", Palatino, "Palatino Linotype", serif;
  --mono: "Martian Mono", ui-monospace, "Courier New", monospace;
  --nav-h: 4.25rem;
  --wrap: 1120px;
  color-scheme: light;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--specimen);
  color: var(--carbon);
  font-family: var(--body);
  font-size: 1.125rem;
  font-weight: 460;
  line-height: 1.55;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-underline-offset: 0.18em;
}

a:visited {
  color: inherit;
}

a:hover {
  text-decoration-thickness: 2px;
}

p,
dd,
.lede {
  max-width: 62ch;
}

h1,
h2,
h3 {
  font-family: var(--display);
  font-weight: 720;
  letter-spacing: -0.03em;
  line-height: 0.94;
  margin: 0;
  scroll-margin-top: 6.5rem;
}

h1 {
  font-stretch: 116%;
  font-size: clamp(2.45rem, 5.2vw, 4.7rem);
  max-width: none;
}

h2 {
  font-stretch: 118%;
  font-size: clamp(2rem, 4vw, 3.05rem);
  margin-bottom: 1rem;
}

h3 {
  font-stretch: 108%;
  font-weight: 650;
  font-size: 1.45rem;
  line-height: 1.1;
  margin-bottom: 0.55rem;
}

code,
pre,
.kicker,
.nav-links,
.copy,
.part .k,
.fields dt,
.enums,
.stack dt,
.dl-file,
.mono {
  font-family: var(--mono);
}

.wrap {
  width: min(var(--wrap), calc(100% - 2.5rem));
  margin-inline: auto;
}

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 30;
  background: var(--ticket);
  color: var(--carbon);
  padding: 0.55rem 0.8rem;
  text-decoration: none;
}

.skip:focus {
  top: 0.6rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

:focus {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--carbon);
  outline-offset: 3px;
}

.nav :focus-visible,
.hero :focus-visible,
.site-footer :focus-visible {
  outline-color: var(--ticket);
}

.hero .copy.primary:focus-visible {
  outline-color: var(--slip);
}

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--canopy);
  color: var(--specimen);
  border-bottom: 1px solid rgba(231, 239, 230, 0.16);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  min-height: var(--nav-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
  font-family: var(--display);
  font-stretch: 150%;
  font-weight: 760;
  font-size: 1.45rem;
  letter-spacing: -0.04em;
  line-height: 1;
}

.brand svg {
  display: block;
}

.nav-links {
  display: flex;
  gap: 0.9rem;
  flex: 1;
  min-width: 0;
  overflow-x: auto;
  font-size: 0.78rem;
  letter-spacing: 0.01em;
}

.nav-links a,
.nav-end a {
  text-decoration: none;
  white-space: nowrap;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.nav-links a:hover,
.nav-end a:hover,
.brand:hover {
  text-decoration: underline;
  text-decoration-color: var(--ticket);
  text-decoration-thickness: 2px;
}

.nav-end {
  display: flex;
  gap: 1rem;
  margin-left: auto;
  font-family: var(--mono);
  font-size: 0.78rem;
}

.hero {
  background: var(--canopy);
  color: var(--specimen);
  padding: 2.5rem 0 4.5rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  grid-template-areas:
    "copy slip"
    "cmd slip";
  column-gap: 3rem;
  row-gap: 1.75rem;
  align-items: start;
}

.hero-copy,
.hero-cmd,
.slip,
.split > *,
.graph-layout > * {
  min-width: 0;
}

.hero-copy {
  grid-area: copy;
}

.hero-cmd {
  grid-area: cmd;
  align-self: end;
}

.kicker {
  margin: 0 0 1.1rem;
  font-size: 0.78rem;
  letter-spacing: 0.01em;
  color: var(--graph);
}

.kicker a {
  color: var(--specimen);
}

.kicker.on-paper {
  color: var(--fern);
}

.hero h1 {
  color: var(--slip);
  margin-bottom: 1.15rem;
}

.lede {
  margin: 0;
  font-size: 1.2rem;
  line-height: 1.45;
  color: var(--specimen);
  max-width: 38ch;
}

.lede + .lede {
  margin-top: 0.8rem;
  font-size: 1.05rem;
  color: #d5e4db;
}

.cmd {
  display: flex;
  align-items: stretch;
  gap: 0.6rem;
  background: var(--canopy-deep);
  padding: 0.55rem 0.55rem 0.55rem 0.9rem;
  max-width: 40rem;
}

.cmd pre {
  margin: 0;
  flex: 1;
  min-width: 0;
  overflow-x: auto;
  font-size: 0.78rem;
  line-height: 1.55;
  padding: 0.35rem 0;
}

.cmd code {
  user-select: all;
}

.copy {
  appearance: none;
  border: 0;
  background: var(--canopy);
  color: var(--specimen);
  font-size: 0.75rem;
  letter-spacing: 0.01em;
  padding: 0.55rem 0.85rem;
  min-height: 44px;
  min-width: 5.5rem;
  cursor: pointer;
  align-self: center;
}

.copy:hover {
  background: #1f4a3c;
}

.copy.primary {
  background: var(--ticket);
  color: var(--carbon);
  align-self: stretch;
}

.copy.primary:hover {
  background: #f4f7a4;
}

.slip {
  grid-area: slip;
  margin: 0;
  background: var(--slip);
  color: var(--carbon);
  padding: 1.15rem 1.15rem 1.25rem;
  box-shadow: 7px 7px 0 var(--canopy-deep);
}

.slip figcaption {
  font-family: var(--display);
  font-stretch: 112%;
  font-weight: 680;
  font-size: 1.15rem;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 0.35rem;
}

.gloss {
  margin: 0 0 1rem;
  font-style: italic;
  font-size: 1rem;
  color: var(--fern);
  max-width: none;
}

.part {
  display: grid;
  grid-template-columns: minmax(9.5rem, 0.9fr) minmax(0, 1.1fr);
  gap: 0.35rem 0.75rem;
  align-items: baseline;
  padding: 0.45rem 0;
}

.part .k {
  font-size: 0.68rem;
  color: var(--fern);
  line-height: 1.35;
}

.part code,
.sum code {
  font-size: 0.78rem;
  line-height: 1.4;
  overflow-wrap: anywhere;
}

.op {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--fern);
  line-height: 1;
}

.join-rule {
  height: 2px;
  margin: 0.7rem 0 0.85rem;
  background: var(--canopy);
  transform: scaleX(0);
  transform-origin: left center;
  animation: draw 700ms 180ms cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.sum {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin: 0;
  max-width: none;
}

.eq {
  flex: 0 0 auto;
  width: 2.4rem;
  height: 2.4rem;
  display: grid;
  place-items: center;
  background: var(--ticket);
  color: var(--carbon);
  font-family: var(--display);
  font-stretch: 100%;
  font-weight: 760;
  font-size: 1.45rem;
  line-height: 1;
}

.block {
  padding: 4.25rem 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 6.5rem;
}

.block > .wrap > h2 + p {
  margin-top: 0;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 2.25rem 2.75rem;
  align-items: start;
}

.prose p {
  margin: 0 0 0.9rem;
}

.snippet {
  margin: 0;
  background: var(--slip);
  border: 1px solid var(--canopy);
  padding: 1rem 1rem 0.9rem;
  overflow-x: auto;
  max-width: 100%;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.snippet.with-copy {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.snippet pre {
  margin: 0;
  flex: 1;
  min-width: 0;
  font-size: 0.78rem;
  line-height: 1.55;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.snippet code {
  user-select: all;
}

.caption {
  margin: 0.55rem 0 0;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--fern);
  max-width: none;
}

.plain-list {
  margin: 0.4rem 0 0;
  padding-left: 1.15rem;
}

.plain-list li {
  margin: 0.35rem 0;
  max-width: 62ch;
}

.plain-list li::marker {
  color: var(--fern);
}

.enums {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  margin: 0.8rem 0 0;
  padding: 0;
  max-width: none;
}

.enums li {
  background: var(--slip);
  border: 1px solid var(--line);
  padding: 0.28rem 0.45rem;
  font-size: 0.72rem;
  line-height: 1.35;
}

.fields {
  margin: 1.1rem 0 0;
  display: grid;
  gap: 0.85rem;
}

.fields div {
  display: grid;
  grid-template-columns: 11.5rem minmax(0, 1fr);
  gap: 0.35rem 1rem;
  align-items: baseline;
}

.fields dt {
  margin: 0;
  font-size: 0.72rem;
  color: var(--fern);
}

.fields dd {
  margin: 0;
}

.subhead {
  margin-top: 2.6rem;
}

.graph-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 2rem 2.5rem;
  align-items: center;
}

.graph-figure {
  margin: 0;
  background: var(--slip);
  border: 1px solid var(--canopy);
  padding: 0.75rem 0.75rem 0.9rem;
}

.graph-figure svg {
  display: block;
  width: 100%;
  height: auto;
}

.stack {
  margin: 1.25rem 0 0;
  display: grid;
  grid-template-columns: 9.5rem minmax(0, 1fr);
  gap: 0.45rem 1rem;
  max-width: 46rem;
}

.stack dt {
  margin: 0;
  font-size: 0.72rem;
  color: var(--fern);
}

.stack dd {
  margin: 0;
}

.install-block + .install-block {
  margin-top: 2.2rem;
}

.note {
  margin-top: 0.85rem;
  color: var(--fern);
}

.downloads {
  list-style: none;
  margin: 0.4rem 0 0;
  padding: 0;
  max-width: 46rem;
}

.downloads li {
  display: grid;
  grid-template-columns: minmax(8rem, 12rem) minmax(0, 1fr) auto;
  gap: 0.5rem 1rem;
  align-items: baseline;
  padding: 0.7rem 0;
  border-top: 1px solid var(--line);
}

.downloads li:last-child {
  border-bottom: 1px solid var(--line);
}

.dl-os {
  font-family: var(--display);
  font-stretch: 108%;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.dl-file {
  font-size: 0.72rem;
  overflow-wrap: anywhere;
  color: var(--fern);
}

.qa {
  padding: 1.15rem 0;
  border-top: 1px solid var(--line);
}

.qa:last-child {
  border-bottom: 1px solid var(--line);
}

.qa h3 {
  font-size: 1.35rem;
  margin-bottom: 0.4rem;
}

.qa p {
  margin: 0;
}

.site-footer {
  background: var(--canopy);
  color: var(--specimen);
  padding: 2.4rem 0 2.6rem;
}

.site-footer p {
  margin: 0.3rem 0;
  max-width: none;
  font-size: 1rem;
}

.site-footer a:hover {
  text-decoration-color: var(--ticket);
}

.missing {
  min-height: 70vh;
  display: grid;
  align-content: center;
  padding: 4rem 0 5rem;
}

.missing h1 {
  max-width: 14ch;
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  margin-bottom: 1rem;
}

.live {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

@media (max-width: 900px) {
  .nav-inner {
    flex-wrap: wrap;
    row-gap: 0;
    padding-block: 0.2rem 0.35rem;
  }

  .nav-links {
    order: 3;
    flex: 1 0 100%;
    flex-wrap: wrap;
    overflow: visible;
    row-gap: 0;
    column-gap: 0.7rem;
  }

  .block,
  h2,
  h3 {
    scroll-margin-top: 10.5rem;
  }
}

@media (max-width: 860px) {
  h1 {
    font-stretch: 108%;
    max-width: none;
  }

  .hero-grid,
  .split,
  .graph-layout {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    grid-template-areas:
      "copy"
      "slip"
      "cmd";
  }

  .hero {
    padding-top: 1.75rem;
  }

  .slip {
    box-shadow: 5px 5px 0 var(--canopy-deep);
  }
}

@media (max-width: 640px) {
  .wrap {
    width: min(var(--wrap), calc(100% - 1.5rem));
  }

  .part,
  .fields div,
  .stack,
  .downloads li {
    grid-template-columns: 1fr;
  }

  .downloads li {
    gap: 0.15rem;
    padding: 0.85rem 0;
  }

  .cmd,
  .snippet.with-copy {
    flex-direction: column;
  }

  .copy.primary {
    align-self: stretch;
  }

  .nav-end {
    gap: 0.7rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .join-rule {
    animation: none;
    transform: none;
  }
}

@keyframes draw {
  to {
    transform: scaleX(1);
  }
}

@media (forced-colors: active) {
  :focus-visible {
    outline: 2px solid CanvasText;
  }

  .eq,
  .copy.primary {
    border: 1px solid CanvasText;
  }
}