:root {
  --paper: #ffffff;
  --concrete: #f3f2ee;
  --ink: #16181b;
  --muted: #555b63;
  --rule: #7a8089;
  --hairline: #e4e2dc;
  --safety: #ffc21a;
  --link: #16181b;
  --code-bg: #f3f2ee;
  --note-bg: #fff6d9;
  --warn-bg: #fbe9e7;
  --warn-rule: #b3261e;
  --font-heading: 'Barlow Condensed', 'Arial Narrow', sans-serif;
  --font-body: 'IBM Plex Sans', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;
  --topbar: 3.5rem;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #16181b;
    --concrete: #1f2226;
    --ink: #f3f2ee;
    --muted: #b4b9c0;
    --rule: #8a9099;
    --hairline: #2e3238;
    --link: #f3f2ee;
    --code-bg: #23272d;
    --note-bg: #2b2616;
    --warn-bg: #2d1a19;
    --warn-rule: #ff8a80;
    color-scheme: dark;
  }
}

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

html {
  scroll-padding-top: calc(var(--topbar) + 1rem);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1rem/1.65 var(--font-body);
}

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

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

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

:focus-visible {
  outline: 3px solid var(--safety);
  outline-offset: 2px;
  box-shadow: 0 0 0 5px var(--ink);
}

.mono,
code,
kbd {
  font-family: var(--font-mono);
  font-size: 0.875em;
}

code {
  padding: 0.1em 0.35em;
  background: var(--code-bg);
  border: 1px solid var(--hairline);
  word-break: break-word;
}

pre {
  overflow-x: auto;
  padding: 1rem;
  background: var(--code-bg);
  border: 1px solid var(--hairline);
  font-size: 0.875rem;
}

pre code {
  padding: 0;
  border: 0;
  background: none;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -10rem;
  z-index: 10;
  padding: 0.75rem 1rem;
  background: var(--safety);
  color: #16181b;
  font-weight: 600;
}

.skip-link:focus {
  top: 0.5rem;
}

/* Top bar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 1rem;
  height: var(--topbar);
  padding: 0 1rem;
  background: #16181b;
  color: #ffffff;
  border-bottom: 4px solid var(--safety);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: inherit;
  text-decoration: none;
}

.brand__mark {
  width: 1.5rem;
  height: 1.5rem;
  background: var(--safety);
  clip-path: polygon(0 20%, 100% 20%, 100% 45%, 70% 45%, 60% 80%, 80% 80%, 80% 100%, 20% 100%, 20% 80%, 40% 80%, 30% 45%, 0 45%);
}

.brand__name {
  font: 700 1.5rem/1 var(--font-heading);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.brand__tag {
  padding: 0.1rem 0.4rem;
  border: 1px solid #7a8089;
  font: 500 0.75rem/1.4 var(--font-mono);
  text-transform: uppercase;
}

.topbar__version {
  color: #c9cdd2;
}

@media (max-width: 400px) {
  .topbar__version {
    display: none;
  }
}

.topbar__cta {
  margin-inline-start: auto;
  padding: 0.5rem 0.875rem;
  background: var(--safety);
  color: #16181b;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  white-space: nowrap;
}

.topbar__cta:hover {
  text-decoration: underline;
}

/* Layout */
.shell {
  display: grid;
  max-width: 82rem;
  margin: 0 auto;
}

.sidebar {
  border-bottom: 1px solid var(--hairline);
}

.sidebar__toggle {
  display: flex;
  align-items: center;
  min-height: 3rem;
  padding: 0 1rem;
  cursor: pointer;
  font: 500 0.875rem/1 var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.nav,
.nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav {
  padding: 0 1rem 1rem;
}

.nav__group {
  display: block;
  margin: 1.25rem 0 0.375rem;
  color: var(--muted);
  font: 500 0.75rem/1.4 var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.nav a {
  display: block;
  padding: 0.4rem 0.75rem;
  border-inline-start: 3px solid transparent;
  text-decoration: none;
}

.nav a:hover {
  background: var(--concrete);
}

.nav a[aria-current='page'] {
  border-inline-start-color: var(--safety);
  background: var(--concrete);
  font-weight: 600;
}

.content {
  min-width: 0;
  padding: 1.5rem 1rem 3rem;
}

.content:focus {
  outline: none;
}

@media (min-width: 900px) {
  .shell {
    grid-template-columns: 16rem minmax(0, 1fr);
  }

  .sidebar {
    position: sticky;
    top: var(--topbar);
    align-self: start;
    max-height: calc(100vh - var(--topbar));
    overflow-y: auto;
    border-bottom: 0;
    border-inline-end: 1px solid var(--hairline);
  }

  .sidebar__toggle {
    display: none;
  }

  .content {
    padding: 2.5rem 3rem 4rem;
  }
}

.content > * {
  max-width: 46rem;
}

.content > .table-wrap,
.content > .ref,
.content > .cards {
  max-width: 60rem;
}

/* Typography */
h1,
h2,
h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.05;
  text-transform: uppercase;
  letter-spacing: 0.01em;
}

h1 {
  margin: 0 0 1rem;
  font-size: clamp(2.25rem, 1.6rem + 2.5vw, 3.25rem);
}

h2 {
  margin: 2.75rem 0 0.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--hairline);
  font-size: 1.875rem;
}

h3 {
  margin: 2rem 0 0.5rem;
  font-size: 1.375rem;
}

h4 {
  margin: 1.5rem 0 0.5rem;
  font-size: 1rem;
}

.lead {
  color: var(--muted);
  font-size: 1.125rem;
}

.muted {
  color: var(--muted);
}

.eyebrow {
  margin: 0 0 0.5rem;
  color: var(--muted);
  font: 500 0.8125rem/1.4 var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

li + li {
  margin-top: 0.25rem;
}

/* Callouts */
.note,
.warning {
  margin: 1.25rem 0;
  padding: 0.875rem 1rem;
  border-inline-start: 4px solid var(--safety);
  background: var(--note-bg);
}

.warning {
  border-inline-start-color: var(--warn-rule);
  background: var(--warn-bg);
}

.note > :first-child,
.warning > :first-child {
  margin-top: 0;
}

.note > :last-child,
.warning > :last-child {
  margin-bottom: 0;
}

/* Steps */
ol.steps {
  counter-reset: step;
  padding: 0;
  list-style: none;
}

ol.steps > li {
  position: relative;
  padding-inline-start: 2.75rem;
  counter-increment: step;
}

ol.steps > li + li {
  margin-top: 0.75rem;
}

ol.steps > li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.1rem;
  width: 2rem;
  padding: 0.1rem 0;
  border: 1px solid var(--rule);
  font: 500 0.75rem/1.4 var(--font-mono);
  text-align: center;
}

/* Tables */
.table-wrap {
  overflow-x: auto;
  margin: 1rem 0;
  border: 1px solid var(--hairline);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

th,
td {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--hairline);
  text-align: start;
  vertical-align: top;
}

thead th {
  background: var(--concrete);
  font: 500 0.75rem/1.4 var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

tbody th {
  font-weight: 600;
  min-width: 10rem;
}

td.mono {
  white-space: nowrap;
  color: var(--muted);
}

tr.table-group th {
  background: var(--concrete);
  font: 700 1rem/1.2 var(--font-heading);
  text-transform: uppercase;
}

tr.table-note td {
  color: var(--muted);
  font-style: italic;
}

tbody tr:last-child > * {
  border-bottom: 0;
}

/* Reference */
.toc {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  border: 1px solid var(--hairline);
  background: var(--concrete);
}

.toc ul {
  margin: 0;
  padding-inline-start: 1.25rem;
}

.toc > ul {
  padding: 0;
  list-style: none;
  columns: 2 14rem;
}

.toc > ul > li {
  break-inside: avoid;
  margin-bottom: 0.5rem;
}

.ref h3 {
  scroll-margin-top: calc(var(--topbar) + 1rem);
}

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: 0;
  margin: 1.5rem 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--hairline);
  border-inline-start: 1px solid var(--hairline);
}

.cards > li {
  margin: 0;
  border-bottom: 1px solid var(--hairline);
  border-inline-end: 1px solid var(--hairline);
}

.cards a {
  display: block;
  height: 100%;
  padding: 1.25rem;
  text-decoration: none;
}

.cards a:hover {
  background: var(--concrete);
}

.cards strong {
  display: block;
  font: 700 1.25rem/1.1 var(--font-heading);
  text-transform: uppercase;
}

.cards span {
  display: block;
  margin-top: 0.375rem;
  color: var(--muted);
  font-size: 0.9375rem;
}

/* Presets */
.swatches {
  display: flex;
  gap: 0;
  margin: 0.75rem 0;
  border: 1px solid var(--rule);
  width: max-content;
}

.swatches span {
  width: 2.5rem;
  height: 2.5rem;
}

/* FAQ */
.faq details {
  border-bottom: 1px solid var(--hairline);
}

.faq details:first-of-type {
  border-top: 1px solid var(--hairline);
}

.faq summary {
  padding: 1rem 2rem 1rem 0;
  position: relative;
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: '+';
  position: absolute;
  right: 0.25rem;
  top: 0.8rem;
  font: 500 1.25rem/1 var(--font-mono);
}

.faq details[open] summary::after {
  content: '−';
}

.faq details > div {
  padding-bottom: 1rem;
}

/* Form */
.form {
  display: grid;
  gap: 1.25rem;
  margin: 1.5rem 0;
  padding: 1.5rem;
  border: 1px solid var(--hairline);
  background: var(--concrete);
}

.field {
  display: grid;
  gap: 0.375rem;
}

.field label {
  font-weight: 600;
}

.field .hint {
  color: var(--muted);
  font-size: 0.875rem;
}

.field input,
.field textarea,
.field select {
  width: 100%;
  min-height: 2.75rem;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--rule);
  border-radius: 0;
  background: var(--paper);
  color: var(--ink);
  font: inherit;
}

.field textarea {
  min-height: 9rem;
  resize: vertical;
}

.field input[type='file'] {
  padding: 0.5rem;
}

.req {
  color: var(--muted);
  font-weight: 400;
  font-size: 0.875rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.6rem 1.5rem;
  border: 0;
  background: var(--safety);
  color: #16181b;
  font: 600 1rem/1.2 var(--font-body);
  text-decoration: none;
  cursor: pointer;
  justify-self: start;
}

.button:hover {
  box-shadow: inset 0 0 0 2px #16181b;
}

.form-error {
  margin: 0;
  color: var(--warn-rule);
  font-weight: 600;
}

/* Footer */
.page-footer {
  margin-top: 4rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--hairline);
  color: var(--muted);
  font-size: 0.875rem;
}

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