@font-face {
  font-family: "Hanken Grotesk";
  src: url("fonts/hanken-grotesk-latin-400-normal.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "Hanken Grotesk";
  src: url("fonts/hanken-grotesk-latin-600-normal.woff2") format("woff2");
  font-weight: 600;
  font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("fonts/jetbrains-mono-latin-400-normal.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}

:root {
  /* palette */
  --palette-ground: #f5f4f6;
  --palette-ground-warm: #faf6f5;
  --palette-ground-cool: #eef3ef;
  --palette-paper: #ffffff;
  --palette-ink: #16181a;
  --palette-ink-soft: #4a4d52;
  --palette-seal: #dcddf3;
  --palette-seal-ink: #3d3f86;
  --palette-hairline: #c9c7c4;

  /* roles */
  --color-ground: var(--palette-ground);
  --color-plate: var(--palette-paper);
  --color-text: var(--palette-ink);
  --color-text-muted: var(--palette-ink-soft);
  --color-rule: var(--palette-hairline);
  --color-accent: var(--palette-seal);
  --color-accent-ink: var(--palette-seal-ink);

  /* type */
  --font-sans: "Hanken Grotesk", "Helvetica Neue", Arial, "Hiragino Sans", "Yu Gothic", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --text-size-display: clamp(3rem, 1.6rem + 4.6vw, 5.75rem);
  --text-size-title: clamp(2.5rem, 1.8rem + 2.6vw, 4rem);
  --text-size-h2: clamp(1.75rem, 1.4rem + 1.2vw, 2.5rem);
  --text-size-h3: 1.375rem;
  --text-size-body: 1.0625rem;
  --text-size-small: 0.9375rem;
  --text-size-code: 0.875rem;
  --text-size-label: 0.6875rem;
  --tracking-label: 0.14em;

  /* space */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 2.5rem;
  --space-8: 4rem;
  --space-9: 6rem;
  --gutter: 2.5rem;
  --bar-height: 72px;
  --measure: 68ch;
  --page-max: 1360px;

  --ease-out: cubic-bezier(0.19, 1, 0.22, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-padding-top: calc(var(--bar-height) + var(--space-5)); -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  color: var(--color-text);
  background-color: var(--color-ground);
  background-image:
    radial-gradient(ellipse 70% 50% at 0% 0%, var(--palette-ground-warm), transparent 70%),
    radial-gradient(ellipse 60% 50% at 100% 100%, var(--palette-ground-cool), transparent 70%);
  background-attachment: fixed;
  font: 400 var(--text-size-body)/1.6 var(--font-sans);
  font-kerning: normal;
  text-rendering: optimizeLegibility;
  scrollbar-color: var(--palette-hairline) var(--color-ground);
}
::selection { background: var(--color-accent); color: var(--color-text); }
:focus-visible { outline: 2px solid var(--color-text); outline-offset: 3px; }
img, svg { display: block; max-width: 100%; }

h1, h2, h3 { font-weight: 400; margin: 0; text-wrap: balance; }
h1 { font-size: var(--text-size-title); line-height: 1.02; letter-spacing: -0.02em; }
h2 { font-size: var(--text-size-h2); line-height: 1.1; letter-spacing: -0.015em; }
h3 { font-size: var(--text-size-h3); line-height: 1.25; letter-spacing: -0.005em; }
p { margin: 0; }
p + p { margin-top: var(--space-4); }
strong { font-weight: 600; }
a { color: inherit; text-decoration-line: underline; text-decoration-thickness: 1px; text-underline-offset: 0.22em; text-decoration-color: var(--color-rule); transition: text-decoration-color 0.3s var(--ease-out); }
a:hover { text-decoration-color: currentColor; }
code, kbd, pre { font-family: var(--font-mono); font-size: var(--text-size-code); }
:not(pre) > code { white-space: nowrap; padding: 0.05em 0.3em; background: var(--color-plate); outline: 1px solid var(--color-rule); outline-offset: -1px; }
td :not(pre) > code, li :not(pre) > code, p :not(pre) > code { white-space: normal; overflow-wrap: anywhere; }

.label {
  font: 400 var(--text-size-label)/1.4 var(--font-mono);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}
.skip { position: absolute; left: var(--space-4); top: -100px; z-index: 20; background: var(--color-text); color: var(--color-plate); padding: var(--space-3) var(--space-4); }
.skip:focus { top: var(--space-3); }

/* ---- token bar ---- */
.bar {
  position: sticky; top: 0; z-index: 10;
  height: var(--bar-height);
  background: color-mix(in srgb, var(--color-ground) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-rule);
}
.bar-inner {
  max-width: var(--page-max); height: 100%; margin: 0 auto; padding: 0 var(--gutter);
  display: flex; align-items: center; gap: var(--space-6);
}
.wordmark { display: flex; align-items: baseline; gap: var(--space-3); margin-right: auto; text-decoration: none; }
.wordmark .jp { font-family: var(--font-sans); letter-spacing: 0.2em; font-size: 0.8125rem; }
.bar nav ul { list-style: none; display: flex; gap: var(--space-6); margin: 0; padding: 0; }
.bar nav a { text-decoration: none; position: relative; padding: var(--space-2) 0; }
.bar nav a[aria-current="page"]::after {
  content: ""; position: absolute; left: 50%; bottom: -6px; width: 5px; height: 5px; margin-left: -2.5px;
  border-radius: 50%; background: var(--color-text);
}
.bar nav a:hover { text-decoration: underline; text-underline-offset: 0.4em; }

/* ---- page frame ---- */
.page { max-width: var(--page-max); margin: 0 auto; padding: 0 var(--gutter); }

/* ---- plates: white stock with registration crosshairs at each corner ---- */
.plate {
  --cross: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='21' height='21'%3E%3Cpath d='M10.5 0v21M0 10.5h21' stroke='%2316181a' stroke-width='1'/%3E%3C/svg%3E");
  position: relative;
  padding: 10px;
}
/* the crosses sit above the plate-body so all four arms show at each corner */
.plate::after {
  content: ""; position: absolute; inset: 0; pointer-events: none; z-index: 1;
  background:
    var(--cross) left top / 21px no-repeat,
    var(--cross) right top / 21px no-repeat,
    var(--cross) left bottom / 21px no-repeat,
    var(--cross) right bottom / 21px no-repeat;
}
/* a specimen inside a plate is set on the ground, not as a second plate */
.plate .plate { padding: 0; margin-top: var(--space-5); }
.plate .plate::after { display: none; }
.plate .plate .plate-body { background: var(--color-ground); padding: var(--space-5); }
.plate-body { background: var(--color-plate); padding: var(--space-6); overflow-x: auto; }
.plate-caption { display: flex; justify-content: space-between; gap: var(--space-4); padding: var(--space-3) 10px 0; color: var(--color-text-muted); }
.plate pre { margin: 0; line-height: 1.85; color: var(--color-text); }
.plate pre .c { color: var(--color-text-muted); }
.plate pre .k { color: var(--color-accent-ink); }

/* ---- buttons ---- */
.btn {
  display: inline-flex; align-items: center; gap: var(--space-4);
  min-height: 48px; padding: 0 var(--space-5);
  font: 400 0.75rem/1 var(--font-mono); letter-spacing: 0.12em; text-transform: uppercase; text-decoration: none;
  border: 1px solid var(--color-text);
  transition: background-color 0.1s ease, color 0.1s ease;
}
.btn-primary { background: var(--color-text); color: var(--color-plate); }
.btn-primary:hover { background: var(--color-plate); color: var(--color-text); }
.btn-secondary { background: transparent; color: var(--color-text); }
.btn-secondary:hover { background: var(--color-text); color: var(--color-plate); }
.btn svg { width: 18px; height: 10px; }

/* ---- index: first viewport ---- */
.hero {
  display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter);
  align-items: start; padding-top: var(--space-7);
}
.hero-text { grid-column: 1 / span 6; }
.hero-text h1 { font-size: var(--text-size-display); line-height: 0.98; letter-spacing: -0.02em; }
.hero-text .lede { margin-top: var(--space-6); max-width: 46ch; font-size: 1.1875rem; line-height: 1.55; }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-4); margin-top: var(--space-6); }
.hero-plate { grid-column: 7 / span 6; position: relative; margin: 0; }
.hero-plate .plate-body { padding: var(--space-6) var(--space-6) var(--space-7); }
.hero-plate pre { font-size: 0.8125rem; }
.hero-plate .plate-caption { padding-left: 104px; }
.dots {
  position: absolute; width: 132px; height: 132px; left: -164px; bottom: 24px;
  background-image: radial-gradient(circle, var(--palette-ink-soft) 1px, transparent 1.4px);
  background-size: 18px 18px; opacity: 0.55;
}

.seal { position: absolute; z-index: 2; left: -64px; bottom: -64px; width: 148px; height: 148px; color: var(--color-text); }
.seal-disc { fill: var(--color-accent); }
.seal-ring { transform-origin: 74px 74px; animation: turn 25s linear infinite; }
.seal-ring text { font: 400 10.5px var(--font-mono); letter-spacing: 0.16em; fill: currentColor; }
.seal-mark { font: 400 22px var(--font-sans); fill: currentColor; letter-spacing: 0.05em; }
@keyframes turn { to { transform: rotate(360deg); } }

.steps {
  display: grid; grid-template-columns: 1.3fr 1fr 1fr 1fr;
  margin-top: var(--space-7); border-top: 1px solid var(--color-rule);
}
.steps li { list-style: none; padding: var(--space-5) var(--space-5) var(--space-5) 0; }
.steps li + li { border-left: 1px dashed var(--color-rule); padding-left: var(--space-5); }
.steps { padding: 0; }
.steps .label { display: block; }
.steps p { margin-top: var(--space-2); font-size: var(--text-size-small); color: var(--color-text-muted); max-width: 32ch; }
.steps code { font-size: 0.8125rem; display: block; width: fit-content; max-width: 100%; margin-top: var(--space-3); padding: 0.15em 0.4em; white-space: normal; line-height: 1.6; }

/* ---- sections ---- */
.section { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter); padding-top: var(--space-9); }
.section > .section-head { grid-column: 1 / span 4; }
.section > .section-body { grid-column: 5 / span 8; }
.section-body > p, .section-body > ul, .section-body > ol { max-width: var(--measure); }
.hero > *, .section > *, .doc > *, .doc-head > * { min-width: 0; }
.section > .section-wide { grid-column: 5 / span 8; }
.section-head h2 { position: sticky; top: calc(var(--bar-height) + var(--space-5)); }
.section-body > * + * { margin-top: var(--space-5); }
.section-body > .plate { margin-top: var(--space-6); }
.section-body h3 { margin-top: var(--space-7); }
.section-body ul, .section-body ol { padding-left: 1.2em; margin: 0; }
.section-body li + li { margin-top: var(--space-2); }
.section-body li::marker { color: var(--color-text-muted); }

/* ---- entry marks: a state is a printed mark, never colour alone ---- */
.tree { line-height: 2.1; white-space: pre; }
.mark { display: inline-grid; place-items: center; width: 1.5em; height: 1.5em; border-radius: 50%; font: 400 0.6875rem/1 var(--font-mono); vertical-align: 0.1em; }
.mark-owned { background: var(--color-text); color: var(--color-plate); }
.mark-kept { border: 1px solid var(--color-text); }
.mark-never { border: 1px dashed var(--color-text-muted); color: var(--color-text-muted); }
.legend { list-style: none; padding: 0 !important; display: grid; gap: var(--space-3); }
.legend li { display: grid; grid-template-columns: 2em 1fr; align-items: baseline; margin: 0 !important; }

/* ---- reference pages ---- */
.doc-head { padding-top: var(--space-8); display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter); }
.doc-head h1 { grid-column: 1 / span 8; }
.doc-head .lede { grid-column: 1 / span 7; margin-top: var(--space-5); font-size: 1.1875rem; max-width: 56ch; }
.doc { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter); padding-top: var(--space-8); border-bottom: 1px solid transparent; }
.doc-body { min-width: 0; }
.doc-body > section + section { margin-top: var(--space-9); }
.doc-body section > * + * { margin-top: var(--space-5); }
.doc-body section > h3 { margin-top: var(--space-7); }
.doc-body p, .doc-body ul, .doc-body ol { max-width: var(--measure); }
.doc-body ul, .doc-body ol { padding-left: 1.2em; margin-bottom: 0; }
.doc-body li + li { margin-top: var(--space-2); }
.doc-body li::marker { color: var(--color-text-muted); }

/* tables: hairline rules, right edges tight */
.table-wrap { overflow-x: auto; border-top: 1px solid var(--color-text); }
table { width: 100%; border-collapse: collapse; font-size: var(--text-size-small); font-variant-numeric: tabular-nums; }
th { text-align: left; font: 400 var(--text-size-label)/1.4 var(--font-mono); letter-spacing: var(--tracking-label); text-transform: uppercase; color: var(--color-text-muted); padding: var(--space-3) var(--space-4) var(--space-3) 0; border-bottom: 1px solid var(--color-rule); }
td { vertical-align: top; padding: var(--space-3) var(--space-4) var(--space-3) 0; border-bottom: 1px solid var(--color-rule); }
td:first-child { white-space: nowrap; }
td.wrap { white-space: normal; }

/* command entries: one label anatomy for every command */
.cmd { border-top: 1px solid var(--color-text); padding-top: var(--space-4); }
.cmd + .cmd { margin-top: var(--space-7) !important; }
.cmd-name { font: 400 1.25rem/1.3 var(--font-mono); letter-spacing: -0.01em; }
.cmd dl { display: grid; grid-template-columns: 9rem 1fr; gap: var(--space-2) var(--space-4); margin: var(--space-4) 0 0; font-size: var(--text-size-small); }
.cmd dt { font: 400 var(--text-size-label)/2 var(--font-mono); letter-spacing: var(--tracking-label); text-transform: uppercase; color: var(--color-text-muted); }
.cmd dd { margin: 0; }
.cmd > p { margin-top: var(--space-4); }

/* prev / next */
.pager { display: grid; grid-template-columns: 1fr 1fr; margin-top: var(--space-9); border-top: 1px solid var(--color-rule); }
.pager a { display: block; padding: var(--space-5) 0; text-decoration: none; }
.pager a:hover .pager-title { text-decoration: underline; text-underline-offset: 0.2em; }
.pager .label { display: block; color: var(--color-text-muted); }
.pager-title { font-size: var(--text-size-h3); }
.pager .next { text-align: right; grid-column: 2; }

/* copy buttons, added by site.js */
.copyable { position: relative; }
.copyable .plate-body { padding-top: 3.5rem; }
.copy {
  position: absolute; top: calc(10px + var(--space-3)); right: calc(10px + var(--space-3)); z-index: 2;
  font: 400 var(--text-size-label)/1 var(--font-mono); letter-spacing: var(--tracking-label); text-transform: uppercase;
  background: var(--color-plate); color: var(--color-text); border: 1px solid var(--color-rule);
  padding: var(--space-2) var(--space-3); cursor: pointer;
}
.copy:hover { border-color: var(--color-text); }
.copy[data-state="done"] { background: var(--color-accent); border-color: var(--color-accent); }

/* footer */
.foot { margin-top: var(--space-9); border-top: 1px solid var(--color-rule); }
.foot-inner { max-width: var(--page-max); margin: 0 auto; padding: var(--space-6) var(--gutter) var(--space-7); display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--space-4); color: var(--color-text-muted); }
.foot a { color: var(--color-text); }

@media (prefers-reduced-motion: reduce) {
  .seal-ring { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---- responsive ---- */
@media (max-width: 1100px) {
  :root { --gutter: 1.75rem; }
  .hero-text { grid-column: 1 / -1; }
  .hero-plate { grid-column: 1 / -1; margin-top: var(--space-8); margin-left: var(--space-8); }
  .dots { display: none; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps li:nth-child(3) { border-left: 0; padding-left: 0; border-top: 1px solid var(--color-rule); }
  .steps li:nth-child(4) { border-top: 1px solid var(--color-rule); }
  .hero, .section, .doc, .doc-head { grid-template-columns: minmax(0, 1fr); }
  .section > .section-head, .section > .section-body, .section > .section-wide { grid-column: 1 / -1; }
  .section-head h2 { position: static; margin-bottom: var(--space-5); }
  .doc-body, .doc-head h1, .doc-head .lede { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  :root { --gutter: 1rem; --bar-height: 96px; }
  .bar-inner { flex-direction: column; align-items: stretch; justify-content: center; gap: var(--space-3); }
  .bar nav ul { justify-content: space-between; gap: var(--space-3); }
  .hero { padding-top: var(--space-7); }
  .hero-plate { margin-left: 0; margin-top: var(--space-7); }
  .hero-plate .plate-body { padding: var(--space-5) var(--space-4) var(--space-8); }
  .seal { width: 112px; height: 112px; left: auto; right: 8px; bottom: -48px; }
  .hero-plate .plate-caption { padding-left: 10px; padding-right: 128px; flex-direction: column; gap: var(--space-1); }
  .steps { grid-template-columns: 1fr; margin-top: var(--space-8); }
  .steps li + li { border-left: 0; padding-left: 0; border-top: 1px solid var(--color-rule); }
  .plate-body { padding: var(--space-5) var(--space-4); }
  .cmd dl { grid-template-columns: 1fr; gap: 0; }
  .cmd dd + dt { margin-top: var(--space-3); }
  .pager { grid-template-columns: 1fr; }
  .pager .next { grid-column: 1; text-align: left; border-top: 1px solid var(--color-rule); }
  .section { padding-top: var(--space-8); }
}
.foot-inner { align-items: baseline; }
.foot-note { font-size: var(--text-size-small); max-width: 60ch; }

/* uncoated stock: a raster grain tile on the ground only; plates stay clean white */
body::before {
  content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background: url("img/uncoated-grain.webp") 0 0 / 256px 256px repeat;
  mix-blend-mode: soft-light; opacity: 1;
}

/* reference pages: a list of plates under the lede, the column gets the page */
.plates-index { grid-column: 1 / -1; margin-top: var(--space-7); border-top: 1px solid var(--color-text); padding-top: var(--space-3); }
.plates-index ol { list-style: none; margin: var(--space-3) 0 0; padding: 0; columns: 3 16rem; column-gap: var(--gutter); }
.plates-index li { break-inside: avoid; border-bottom: 1px solid var(--color-rule); }
.plates-index a { display: flex; gap: var(--space-3); padding: var(--space-2) 0; text-decoration: none; font-size: var(--text-size-small); }
.plates-index a:hover { text-decoration: underline; }
.doc-body { grid-column: 1 / span 10; }
.doc-body > section.plate + section.plate { margin-top: var(--space-8); }
.doc-body section.plate > .plate-body { padding: var(--space-7) var(--space-7) var(--space-7); }
.doc-body section.plate > .plate-body > * + * { margin-top: var(--space-5); }
.doc-body section.plate > .plate-body > h3 { margin-top: var(--space-7); }
.doc-body .pager { margin-top: var(--space-8); }
.plate-caption + * { margin-top: var(--space-6); }

@media (max-width: 1100px) {
  .doc-body { grid-column: 1 / -1; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .steps { grid-template-columns: 1fr; }
  .doc-body section.plate > .plate-body { padding: var(--space-5) var(--space-4); }
  .plates-index ol { columns: 1; }
  .hero-plate .plate-caption { padding-right: 148px; }
  .seal { right: 4px; bottom: -44px; width: 104px; height: 104px; }
  /* tables stack: each row becomes the term above its meaning */
  .table-wrap thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
  .table-wrap tr { display: block; padding: var(--space-3) 0; border-bottom: 1px solid var(--color-rule); }
  .table-wrap td { display: block; border: 0; padding: 0; white-space: normal; }
  .table-wrap td + td { margin-top: var(--space-1); }
}

/* reference plates: the crosses mark the white body, not the caption under it */
.doc-body section.plate { padding: 0; }
.doc-body section.plate::after { display: none; }
.doc-body section.plate > .plate-body { position: relative; overflow: visible; }
.doc-body section.plate > .plate-body::after {
  content: ""; position: absolute; inset: -10px; pointer-events: none;
  background:
    var(--cross) left top / 21px no-repeat,
    var(--cross) right top / 21px no-repeat,
    var(--cross) left bottom / 21px no-repeat,
    var(--cross) right bottom / 21px no-repeat;
}
.doc-body section.plate > .plate-caption { margin-top: 0; padding-left: 0; padding-right: 0; }
.doc-body .plate-caption { max-width: none; }

.section-body > .plate-caption { margin-top: 0; max-width: none; }
.section-body > .plate-caption + * { margin-top: var(--space-6); }