@property --grid-auto-x {
  syntax: "<length>";
  inherits: true;
  initial-value: 0px;
}

@property --grid-auto-y {
  syntax: "<length>";
  inherits: true;
  initial-value: 0px;
}

:root {
  color-scheme: light dark;
  --surface-rgb: 16, 16, 16;
  --ink-rgb: 244, 244, 239;
  --surface: rgb(var(--surface-rgb));
  --ink: rgb(var(--ink-rgb));
  --ink-muted: rgba(var(--ink-rgb), 0.62);
  --line: rgba(var(--ink-rgb), 0.28);
  --line-soft: rgba(var(--ink-rgb), 0.11);
  --panel: rgba(var(--ink-rgb), 0.025);
  --grid-auto-x: 0px;
  --grid-auto-y: 0px;
  --grid-shift-x: 0px;
  --grid-shift-y: 0px;
  --measure: 96ch;
  --shell: 76rem;
  --edge: clamp(0.75rem, 2vw, 1.5rem);
  --directory-edge: var(--edge);
  --pad: clamp(1rem, 2.5vw, 1.5rem);
  --speed: 180ms;
  --home-bar-height: 2.75rem;
  --product-motion: 560ms cubic-bezier(0.16, 1, 0.3, 1);
  --document-file-bar-height: 2.75rem;
  --document-file-bar-offset: 0px;
  --document-nav-height: 3rem;
  --section-bar-height: 3.25rem;
  --document-sticky-top: 0px;
  font-synthesis: none;
}

@media (prefers-color-scheme: light) {
  :root {
    --surface-rgb: 244, 244, 239;
    --ink-rgb: 16, 16, 16;
  }
}

* {
  box-sizing: border-box;
}

html {
  background: var(--surface);
  scroll-behavior: smooth;
  scrollbar-color: var(--line) var(--surface);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background-color: var(--surface);
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-position:
    calc(-1px + var(--grid-auto-x) + var(--grid-shift-x))
    calc(-1px + var(--grid-auto-y) + var(--grid-shift-y));
  background-size: 48px 48px;
  animation: grid-drift 18s cubic-bezier(0.45, 0, 0.55, 1) infinite;
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 13px;
  font-weight: 400;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
}

::selection {
  background: var(--ink);
  color: var(--surface);
}

.u-screen-reader {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--surface);
  outline: 1px solid var(--ink);
  background: var(--ink);
  color: var(--surface);
  text-decoration: none;
  transform: translateY(-220%);
  transition: transform var(--speed) ease;
}

.skip-link:focus {
  transform: translateY(0);
}

:where(a, button):focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 0.25rem;
}

/* Homepage: a centered mark over four expandable product cells. */
body[data-page-family="directory"] {
  display: grid;
  min-height: 100vh;
  min-height: 100svh;
  padding: var(--directory-edge);
  place-items: center;
  overflow: hidden;
}

.product-page-booting body[data-page-family="directory"] {
  visibility: hidden;
}

.home-main {
  --home-frame-width: min(94vw, 70rem);
  --home-frame-height: min(76svh, 42rem);
  position: relative;
  display: grid;
  width: var(--handoff-frame-width, var(--home-frame-width));
  height: var(--handoff-frame-height, var(--home-frame-height));
  min-height: min(24rem, calc(100vh - 3rem));
  min-height: min(24rem, calc(100svh - 3rem));
  border: 1px solid var(--line);
  background-color: var(--surface);
  box-shadow:
    0 0 0 1px var(--surface),
    0 0 0 2px var(--line-soft);
  isolation: isolate;
  place-items: center;
  animation: frame-in 420ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.home-main.is-handoff-preview {
  will-change: width, height;
}

.home-main.is-handoff-preview.is-wheel-handoff {
  transition:
    width 90ms linear,
    height 90ms linear;
}

.home-main.is-handoff-resetting {
  transition:
    width 180ms cubic-bezier(0.22, 1, 0.36, 1),
    height 180ms cubic-bezier(0.22, 1, 0.36, 1);
}

.home-main.is-navigating-product {
  pointer-events: none;
  animation: none;
}

.home-intro {
  position: absolute;
  z-index: 4;
  top: 50%;
  left: 50%;
  width: min(calc(100% - 3rem), 38rem);
  max-width: none;
  max-height: calc(100% - 7rem);
  padding: 0;
  margin: 0;
  overflow: auto;
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow:
    0 0 0 1px var(--surface),
    0 0 0 2px var(--line-soft),
    0 1.5rem 3rem rgba(var(--surface-rgb), 0.28);
  color: var(--ink);
  transform: translate(-50%, -50%);
  animation: intro-in 420ms 100ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.home-intro::backdrop {
  background: transparent;
}

.home-intro:not([open]) {
  display: none;
}

.home-intro.is-closing {
  pointer-events: none;
  animation: intro-out var(--speed) ease both;
}

.home-intro__file {
  display: flex;
  min-height: 2.75rem;
  align-items: center;
  padding: 0 1rem;
  background: var(--ink);
  color: var(--surface);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.home-intro__body {
  padding: clamp(1.25rem, 3vw, 2rem);
}

.home-intro__brand {
  margin: 0 0 1rem;
  color: var(--ink-muted);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.home-intro h2 {
  margin: 0;
  font: inherit;
  font-size: clamp(1rem, 2vw, 1.3rem);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.home-intro h2::before {
  content: "# ";
}

.home-intro [data-home-intro-title]:focus {
  outline: none;
}

.home-intro__description {
  max-width: 62ch;
  margin-top: 1.25rem;
}

.home-intro__lead {
  margin: 0;
  font-size: clamp(0.9rem, 1.5vw, 1.05rem);
  line-height: 1.6;
}

.home-intro__focus {
  margin: 1rem 0 0;
  padding-top: 1rem;
  border-top: 1px dashed var(--line-soft);
  color: var(--ink-muted);
}

.home-intro__meta {
  display: grid;
  align-items: center;
  padding-top: 1rem;
  margin-top: 1.25rem;
  border-top: 1px solid var(--line);
  color: var(--ink-muted);
  font-size: 0.72rem;
  gap: 0.75rem;
  grid-template-columns: minmax(0, 1fr) auto;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.home-intro__email {
  display: block;
  color: var(--ink-muted);
  overflow-wrap: anywhere;
  text-transform: none;
  text-underline-offset: 0.2rem;
}

.home-intro__actions {
  display: grid;
  border-top: 1px solid var(--line);
}

.home-intro__actions button {
  min-height: 3.25rem;
  padding: 0.75rem 1rem;
  border: 0;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition:
    background-color var(--speed) ease,
    color var(--speed) ease;
}

.home-intro__actions button:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: -0.35rem;
}

.home-intro__actions button:active {
  background: var(--ink);
  color: var(--surface);
  outline-color: var(--ink);
}

.home-toolbar,
.home-statusbar {
  position: absolute;
  z-index: 2;
  right: 0;
  left: 0;
  display: flex;
  height: var(--home-bar-height);
  align-items: center;
  padding: 0 1rem;
  background: var(--surface);
  color: var(--ink-muted);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.home-toolbar {
  top: 0;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.home-statusbar {
  bottom: 0;
  justify-content: space-between;
  border-top: 1px solid var(--line);
}

.home-toolbar__file,
.home-statusbar__product {
  display: block;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.home-pagination,
.home-legal {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 0.45rem;
  white-space: nowrap;
}

.home-legal__compact {
  display: none;
}

.home-pagination[hidden] {
  display: none;
}

.home-pagination button,
.home-statusbar a {
  display: inline-flex;
  min-height: 2rem;
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: 0.2rem 0.25rem;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  letter-spacing: inherit;
  text-decoration: none;
  text-transform: inherit;
  transition:
    background-color var(--speed) ease,
    color var(--speed) ease;
}

.home-pagination button {
  cursor: pointer;
}

.home-pagination button:hover,
.home-pagination button:focus-visible,
.home-pagination button:active,
.home-statusbar a:hover,
.home-statusbar a:focus-visible,
.home-statusbar a:active {
  background: var(--ink);
  color: var(--surface);
  outline-color: var(--ink);
}

.home-products {
  position: absolute;
  z-index: 0;
  inset: var(--home-bar-height) 0;
  display: grid;
  grid-template-columns: 50% 50%;
  grid-template-rows: 50% 50%;
  overflow: hidden;
  will-change: grid-template-columns, grid-template-rows;
  transition:
    grid-template-columns var(--product-motion),
    grid-template-rows var(--product-motion);
}

.home-main[data-active-slot="top-left"] .home-products,
.home-main[data-active-slot="bottom-left"] .home-products {
  grid-template-columns: 100% 0%;
}

.home-main[data-active-slot="top-right"] .home-products,
.home-main[data-active-slot="bottom-right"] .home-products {
  grid-template-columns: 0% 100%;
}

.home-main[data-active-slot="top-left"] .home-products,
.home-main[data-active-slot="top-right"] .home-products {
  grid-template-rows: 100% 0%;
}

.home-main[data-active-slot="bottom-left"] .home-products,
.home-main[data-active-slot="bottom-right"] .home-products {
  grid-template-rows: 0% 100%;
}

.product-cell {
  position: relative;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background: var(--panel);
  color: var(--ink-muted);
  transition:
    border-color 240ms ease,
    background-color var(--product-motion),
    color var(--product-motion);
}

.product-cell[data-product-slot="top-left"] {
  grid-column: 1;
  grid-row: 1;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.product-cell[data-product-slot="top-right"] {
  grid-column: 2;
  grid-row: 1;
  border-bottom: 1px solid var(--line);
}

.product-cell[data-product-slot="bottom-left"] {
  grid-column: 1;
  grid-row: 2;
  border-right: 1px solid var(--line);
}

.product-cell[data-product-slot="bottom-right"] {
  grid-column: 2;
  grid-row: 2;
}

.product-cell__content {
  position: absolute;
  inset: 0;
  display: flex;
  min-width: 0;
  min-height: 0;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
  padding: clamp(1rem, 2.5vw, 1.5rem);
  transition: opacity 180ms ease;
}

.product-cell[data-product-slot="top-right"] .product-cell__content,
.product-cell[data-product-slot="bottom-right"] .product-cell__content {
  align-items: flex-end;
  text-align: right;
}

.product-cell[data-product-slot="bottom-left"] .product-cell__content,
.product-cell[data-product-slot="bottom-right"] .product-cell__content {
  justify-content: flex-end;
}

.product-cell__heading {
  max-width: calc(50% - 1rem);
  margin: 0;
  font: inherit;
}

.product-cell__name {
  display: inline-flex;
  min-height: 2rem;
  align-items: center;
  overflow-wrap: anywhere;
  color: var(--ink);
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.25em;
  transition:
    background-color var(--speed) ease,
    color var(--speed) ease;
}

.product-cell__name::before {
  content: "[ ";
}

.product-cell__name::after {
  content: " ]";
}

.product-cell__name:hover,
.product-cell__name:focus-visible,
.product-cell__name:active {
  background: var(--ink);
  color: var(--surface);
  outline-color: var(--ink);
  text-decoration: none;
}

.product-cell__detail {
  width: min(72%, 52rem);
  max-width: none;
  margin-top: 1rem;
  opacity: 0;
  text-align: left;
  transform: translateY(0.75rem);
  transition:
    opacity 280ms 160ms ease,
    transform var(--product-motion);
}

.product-cell__detail[hidden] {
  display: none;
}

.product-cell__eyebrow,
.product-cell__description,
.product-cell__meta {
  margin: 0;
}

.product-cell__eyebrow {
  padding-bottom: 0.75rem;
  color: var(--ink-muted);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.product-cell__description {
  padding-block: 1rem;
  border-block: 1px solid var(--line);
  color: var(--ink);
  font-size: clamp(0.9rem, 1.25vw, 1.05rem);
  line-height: 1.7;
}

.product-cell__meta {
  padding-top: 0.75rem;
  color: var(--ink-muted);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
}

.product-cell__meta::before {
  content: "<!-- ";
}

.product-cell__meta::after {
  content: " -->";
}

.product-cell__actions {
  display: flex;
  flex-wrap: wrap;
  margin-top: 1.25rem;
  gap: 0.5rem;
}

.product-cell__actions button,
.product-cell__actions a {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  text-transform: uppercase;
  transition:
    background-color var(--speed) ease,
    color var(--speed) ease;
}

.product-cell__actions .product-cell__explore {
  background: var(--ink);
  color: var(--surface);
}

.product-cell__actions button:hover,
.product-cell__actions button:focus-visible,
.product-cell__actions button:active {
  background: var(--ink);
  color: var(--surface);
  outline-color: var(--ink);
}

.product-cell__actions .product-cell__explore:hover,
.product-cell__actions .product-cell__explore:focus-visible,
.product-cell__actions .product-cell__explore:active {
  background: var(--surface);
  color: var(--ink);
  outline-color: var(--ink);
}

.product-cell__scroll-cue {
  --scroll-handoff-progress: 0;
  position: relative;
  margin: 0.85rem 0 0;
  padding: 0.7rem 0 0.45rem;
  border-top: 1px dashed var(--line-soft);
  color: var(--ink-muted);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.product-cell__scroll-cue::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 1px;
  background: var(--ink);
  content: "";
  transform: scaleX(var(--scroll-handoff-progress));
  transform-origin: left;
  transition: transform 80ms linear;
}

.product-cell__scroll-cue[hidden] {
  display: none;
}

.home-products.has-active .product-cell:not(.is-active) {
  pointer-events: none;
}

.home-products.has-active .product-cell:not(.is-active) .product-cell__content {
  opacity: 0;
}

.product-cell.is-active {
  border-color: transparent;
  background: var(--panel);
  color: var(--ink-muted);
}

.product-cell.is-active .product-cell__content {
  z-index: 1;
  align-items: center;
  justify-content: center;
  overflow-x: hidden;
  overflow-y: auto;
  padding: clamp(2rem, 6vw, 5.5rem);
  -ms-overflow-style: none;
  overscroll-behavior-y: contain;
  scrollbar-width: none;
  text-align: left;
}

.product-cell.is-active .product-cell__content::-webkit-scrollbar {
  display: none;
  width: 0;
  height: 0;
}

.product-cell.is-active .product-cell__heading {
  width: min(72%, 52rem);
  max-width: none;
  text-align: left;
  animation: product-detail-in 420ms 140ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.product-cell.is-active .product-cell__name {
  max-width: 100%;
  padding: 0.12em 0.28em;
  background: var(--ink);
  color: var(--surface);
  font-size: clamp(1.5rem, 4.5vw, 3.6rem);
  line-height: 1.05;
  letter-spacing: -0.045em;
  text-decoration: none;
}

.product-cell.is-active .product-cell__name:hover,
.product-cell.is-active .product-cell__name:focus-visible,
.product-cell.is-active .product-cell__name:active {
  background: var(--surface);
  box-shadow: inset 0 0 0 1px var(--ink);
  color: var(--ink);
  outline-color: var(--ink);
}

.product-cell.is-active .product-cell__name::before {
  content: "# ";
}

.product-cell.is-active .product-cell__name::after {
  content: "";
}

.product-cell.is-active .product-cell__detail {
  opacity: 1;
  transform: translateY(0);
}

.home-main[data-active-slot="top-left"]
  .product-cell.is-active
  .product-cell__content,
.home-main[data-active-slot="bottom-left"]
  .product-cell.is-active
  .product-cell__content {
  align-items: flex-start;
}

.home-main[data-active-slot="top-right"]
  .product-cell.is-active
  .product-cell__content,
.home-main[data-active-slot="bottom-right"]
  .product-cell.is-active
  .product-cell__content {
  align-items: flex-end;
}

.home-main[data-active-slot="top-right"]
  .product-cell.is-active
  :is(
    .product-cell__heading,
    .product-cell__eyebrow,
    .product-cell__meta,
    .product-cell__scroll-cue
  ),
.home-main[data-active-slot="bottom-right"]
  .product-cell.is-active
  :is(
    .product-cell__heading,
    .product-cell__eyebrow,
    .product-cell__meta,
    .product-cell__scroll-cue
  ) {
  text-align: right;
}

.home-main[data-active-slot="top-right"]
  .product-cell.is-active
  .product-cell__actions,
.home-main[data-active-slot="bottom-right"]
  .product-cell.is-active
  .product-cell__actions {
  justify-content: flex-end;
}

.home-products.is-updating .product-cell__name {
  animation: product-in 260ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.home-logo {
  appearance: none;
  position: absolute;
  z-index: 1;
  top: 50%;
  left: 50%;
  display: grid;
  width: clamp(15rem, 30vw, 21rem);
  height: clamp(14rem, 36vh, 19rem);
  min-height: 0;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  place-items: center;
  transition:
    top var(--product-motion),
    left var(--product-motion),
    width var(--product-motion),
    height var(--product-motion),
    background-color var(--speed) ease,
    color var(--speed) ease,
    transform var(--product-motion);
  transform: translate(-50%, -50%);
  animation: mark-in 520ms 80ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.home-main[data-active-product] .home-logo {
  z-index: 2;
  width: clamp(7.5rem, 12vw, 9.5rem);
  height: clamp(7rem, 18vh, 8.5rem);
}

.home-logo.is-ready {
  animation: none;
}

.home-logo .brand-lockup {
  transition: transform var(--product-motion);
}

.home-main[data-active-product] .home-logo .brand-lockup {
  transform: scale(0.58);
}

.home-main[data-active-slot="top-left"] .home-logo {
  top: calc(100% - var(--home-bar-height) - clamp(0.75rem, 2vw, 1.25rem));
  left: calc(100% - clamp(0.75rem, 2vw, 1.25rem));
  transform: translate(-100%, -100%);
}

.home-main[data-active-slot="top-right"] .home-logo {
  top: calc(100% - var(--home-bar-height) - clamp(0.75rem, 2vw, 1.25rem));
  left: clamp(0.75rem, 2vw, 1.25rem);
  transform: translate(0, -100%);
}

.home-main[data-active-slot="bottom-left"] .home-logo {
  top: calc(var(--home-bar-height) + clamp(0.75rem, 2vw, 1.25rem));
  left: calc(100% - clamp(0.75rem, 2vw, 1.25rem));
  transform: translate(-100%, 0);
}

.home-main[data-active-slot="bottom-right"] .home-logo {
  top: calc(var(--home-bar-height) + clamp(0.75rem, 2vw, 1.25rem));
  left: clamp(0.75rem, 2vw, 1.25rem);
  transform: translate(0, 0);
}

.home-logo:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 0.35rem;
}

.home-logo:active {
  background: var(--ink);
  color: var(--surface);
}

.home-logo::before,
.home-logo::after {
  position: absolute;
  color: var(--ink-muted);
  font-size: 0.65rem;
  line-height: 1;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: color var(--speed) ease;
}

.home-logo::before {
  content: "```mark";
  top: 0.75rem;
  left: 0.85rem;
}

.home-logo::after {
  content: "```";
  right: 0.85rem;
  bottom: 0.75rem;
}

.home-logo:active::before,
.home-logo:active::after {
  color: rgba(var(--surface-rgb), 0.62);
}

/* Content pages: one outer frame with full-width section bands. */
body[data-page-family="document"] {
  padding-block: var(--edge);
  padding-inline: var(--edge);
}

.main {
  width: min(100%, var(--shell));
  margin-inline: auto;
  border: 1px solid var(--line);
  background-color: var(--surface);
  box-shadow:
    0 0 0 1px var(--surface),
    0 0 0 2px var(--line-soft);
  counter-reset: document-section;
}

.main::before {
  content: "[ " attr(data-file) " ]";
  display: flex;
  min-height: var(--document-file-bar-height);
  align-items: center;
  padding: 0 1rem;
  background: var(--ink);
  color: var(--surface);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.document-nav {
  position: sticky;
  z-index: 12;
  top: calc(var(--document-sticky-top) + var(--document-file-bar-offset));
  display: grid;
  height: var(--document-nav-height);
  align-items: center;
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--line);
  background: rgba(var(--surface-rgb), 0.94);
  gap: 1rem;
  grid-template-columns: minmax(0, 1fr) auto;
  transition:
    background-color var(--speed) ease,
    box-shadow var(--speed) ease;
}

body.document-is-scrolled .document-nav {
  box-shadow: 0 0.75rem 1rem rgba(var(--surface-rgb), 0.88);
}

.document-back {
  width: fit-content;
  font-weight: 600;
  white-space: nowrap;
}

.main .document-back::before {
  content: "[ ";
}

.main .document-back::after {
  content: " ]";
  opacity: 1;
}

.document-nav span {
  min-width: 0;
  overflow: hidden;
  color: var(--ink-muted);
  text-align: right;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.section {
  min-width: 0;
  margin: 0;
  border-bottom: 1px solid var(--line);
  background: var(--surface);
  counter-increment: document-section;
  scroll-margin-top: calc(
    var(--document-sticky-top) + var(--document-file-bar-offset) +
      var(--document-nav-height) + var(--section-bar-height)
  );
}

.section-head {
  position: sticky;
  z-index: 10;
  top: calc(
    var(--document-sticky-top) + var(--document-file-bar-offset) +
      var(--document-nav-height)
  );
  display: grid;
  min-height: var(--section-bar-height);
  align-items: center;
  margin: 0;
  padding: 0.75rem var(--pad);
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  grid-template-columns: minmax(0, 1fr) auto;
  transition:
    background-color var(--speed) ease,
    box-shadow var(--speed) ease,
    color var(--speed) ease;
}

.section-head::after {
  content: counter(document-section, decimal-leading-zero);
  min-width: 3ch;
  padding-left: 1rem;
  color: var(--ink-muted);
  text-align: right;
}

body.document-is-scrolled .section.is-current > .section-head {
  background: var(--ink);
  box-shadow: 0 0.55rem 0.85rem rgba(var(--surface-rgb), 0.72);
  color: var(--surface);
}

body.document-is-scrolled .section.is-current > .section-head::after {
  color: rgba(var(--surface-rgb), 0.62);
}

.section-title {
  min-width: 0;
  margin: 0;
  font: inherit;
  font-weight: 600;
  letter-spacing: 0.02em;
}

h1.section-title::before {
  content: "# ";
}

h2.section-title::before {
  content: "## ";
}

.body-lines {
  display: grid;
  width: min(100%, var(--measure));
  gap: 0.8rem;
  margin-inline: auto;
  padding: var(--pad);
}

.body-lines > * {
  min-width: 0;
  margin: 0;
}

.body-lines p {
  margin: 0;
}

.body-lines > p + p {
  padding-top: 0.8rem;
  border-top: 1px dashed var(--line-soft);
}

.entry-sub,
.document-meta {
  color: var(--ink-muted);
}

.document-meta::before {
  content: "<!-- ";
}

.document-meta::after {
  content: " -->";
}

.entry-head,
.entry-sub {
  display: grid;
  align-items: baseline;
  gap: 0 1ch;
  padding: 0.7rem 0.8rem;
  border: 1px solid var(--line);
  grid-template-columns: auto minmax(0, 1fr) auto;
}

.entry-head {
  background: var(--panel);
}

.entry-head::before {
  content: "-";
}

.entry-sub {
  margin-top: -0.8rem;
  border-top: 0;
  font-style: normal;
}

.entry-sub::before {
  content: ">";
}

.entry-head span:last-child,
.entry-sub span:last-child {
  color: var(--ink-muted);
  text-align: right;
}

.entry-head span:last-child::before,
.entry-sub span:last-child::before {
  content: "— ";
}

.main a,
.error-main a {
  margin-inline: -0.18ch;
  padding-inline: 0.18ch;
  overflow-wrap: anywhere;
  text-decoration: none;
  transition:
    background-color var(--speed) ease,
    color var(--speed) ease,
    opacity var(--speed) ease;
}

.main a::before,
.error-main a::before {
  content: "[";
}

.main a::after,
.error-main a::after {
  content: "](" attr(href) ")";
  opacity: 0.62;
}

.main a:hover,
.main a:focus-visible,
.main a:active,
.error-main a:hover,
.error-main a:focus-visible,
.error-main a:active {
  background: var(--ink);
  color: var(--surface);
  outline-color: var(--ink);
  text-decoration: none;
}

.document-footer {
  display: grid;
  margin: 0;
  border-top: 1px solid var(--line);
  background: var(--surface);
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.document-footer::before {
  content: "[ related.md ]";
  padding: 0.55rem 1rem;
  border-bottom: 1px solid var(--line);
  color: var(--ink-muted);
  font-size: 0.7rem;
  grid-column: 1 / -1;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.document-footer a {
  display: grid;
  min-height: 3.25rem;
  align-items: center;
  margin-inline: 0;
  padding: 0.65rem;
  border-left: 1px solid var(--line);
  text-align: center;
}

.document-footer a:first-of-type {
  border-left: 0;
}

.document-footer [aria-current="page"] {
  background: var(--panel);
}

/* Error pages use the same framed file language. */
body[data-page-family="error"] {
  display: grid;
  min-height: 100vh;
  min-height: 100svh;
  padding: var(--edge);
  place-items: center;
}

.error-main {
  display: grid;
  width: min(100%, 42rem);
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow:
    0 0 0 1px var(--surface),
    0 0 0 2px var(--line-soft);
}

.error-main::before {
  content: "[ " attr(data-file) " ]";
  padding: 0.75rem 1rem;
  background: var(--ink);
  color: var(--surface);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.error-main h1,
.error-main p {
  margin: 0;
  padding: 0.85rem 1rem;
  font: inherit;
}

.error-main h1 {
  border-bottom: 1px solid var(--line);
  font-weight: 600;
}

.error-main p + p {
  border-top: 1px dashed var(--line-soft);
}

.error-main h1::before {
  content: "# ";
}

@keyframes frame-in {
  from {
    opacity: 0;
    transform: scale(0.985);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes grid-drift {
  0%,
  100% {
    --grid-auto-x: -28px;
    --grid-auto-y: -18px;
  }
  25% {
    --grid-auto-x: 30px;
    --grid-auto-y: -12px;
  }
  50% {
    --grid-auto-x: 18px;
    --grid-auto-y: 26px;
  }
  75% {
    --grid-auto-x: -32px;
    --grid-auto-y: 20px;
  }
}

@keyframes mark-in {
  from {
    opacity: 0;
    transform: translate(-50%, calc(-50% + 0.5rem));
  }
  to {
    opacity: 1;
    transform: translate(-50%, -50%);
  }
}

@keyframes product-in {
  from {
    opacity: 0;
    transform: translateY(0.3rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes product-detail-in {
  from {
    opacity: 0;
    transform: translateY(0.75rem) scale(0.985);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes intro-in {
  from {
    opacity: 0;
    transform: translate(-50%, calc(-50% + 0.5rem)) scale(0.985);
  }
  to {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}

@keyframes intro-out {
  from {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
  to {
    opacity: 0;
    transform: translate(-50%, calc(-50% - 0.25rem)) scale(0.99);
  }
}

@media (hover: hover) and (pointer: fine) {
  .home-intro__actions button:hover,
  .home-intro__actions button:focus-visible {
    background: var(--ink);
    color: var(--surface);
    outline-color: var(--ink);
  }

  .home-logo:hover {
    background: var(--ink);
    color: var(--surface);
  }

  .home-logo:hover::before,
  .home-logo:hover::after {
    color: rgba(var(--surface-rgb), 0.62);
  }

  .section:hover > .section-head {
    background: var(--ink);
    color: var(--surface);
  }

  .section:hover > .section-head::after {
    color: rgba(var(--surface-rgb), 0.62);
  }

  .document-footer a {
    opacity: 0;
  }

  .document-footer:hover a,
  .document-footer:focus-within a {
    opacity: 1;
  }
}

@media (hover: none), (pointer: coarse) {
  .product-cell.is-active .product-cell__name,
  .product-cell.is-active .product-cell__name:hover,
  .product-cell.is-active .product-cell__name:focus-visible,
  .product-cell.is-active .product-cell__name:active {
    background: var(--ink);
    box-shadow: none;
    color: var(--surface);
  }
}

@media (min-width: 861px) {
  body[data-page-family="document"] {
    --document-file-bar-offset: var(--document-file-bar-height);
    --document-sticky-top: var(--edge);
    background-attachment: fixed;
  }

  .main::before {
    position: sticky;
    z-index: 14;
    top: var(--document-sticky-top);
  }

  body[data-page-family="document"]::before {
    position: fixed;
    z-index: 11;
    top: 0;
    right: 0;
    left: 0;
    height: var(--document-sticky-top);
    content: "";
    pointer-events: none;
    background-color: var(--surface);
    background-image:
      linear-gradient(var(--line-soft) 1px, transparent 1px),
      linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
    background-position:
      calc(-1px + var(--grid-auto-x) + var(--grid-shift-x))
      calc(-1px + var(--grid-auto-y) + var(--grid-shift-y));
    background-size: 48px 48px;
    opacity: 1;
  }
}

@media (max-width: 860px) {
  body[data-page-family="document"] {
    padding-block: var(--edge);
    padding-inline: 0;
  }

  .main {
    width: 100%;
    border-right: 0;
    border-left: 0;
    box-shadow: none;
  }
}

@media (max-width: 640px) {
  :root {
    --directory-edge: 0.75rem;
    --home-bar-height: 2.5rem;
    --document-nav-height: 2.75rem;
    --section-bar-height: 3rem;
  }

  body {
    font-size: 12px;
  }

  body[data-page-family="directory"] {
    padding: var(--directory-edge);
  }

  .home-main {
    --home-frame-width: 100%;
    --home-frame-height: min(82svh, 36rem);
    min-height: min(26rem, calc(100vh - 1.5rem));
    min-height: min(26rem, calc(100svh - 1.5rem));
  }

  .home-intro {
    width: calc(100% - 1.5rem);
    max-height: calc(100% - 6.5rem);
  }

  .home-intro__file {
    min-height: 2.5rem;
    padding-inline: 0.75rem;
    font-size: 0.62rem;
  }

  .home-intro__body {
    padding: 1rem;
  }

  .home-intro__brand {
    margin-bottom: 0.75rem;
    font-size: 0.62rem;
  }

  .home-intro__description {
    margin-top: 1rem;
  }

  .home-intro__focus {
    margin-top: 0.75rem;
    padding-top: 0.75rem;
  }

  .home-intro__meta {
    padding-top: 0.75rem;
    margin-top: 1rem;
    grid-template-columns: 1fr;
    text-transform: none;
  }

  .home-intro__actions button {
    min-height: 3rem;
  }

  .home-toolbar,
  .home-statusbar {
    height: 2.5rem;
    padding-inline: 0.75rem;
    font-size: 0.62rem;
  }

  .home-products {
    inset: var(--home-bar-height) 0;
  }

  .home-legal__full {
    display: none;
  }

  .home-legal__compact {
    display: inline;
  }

  .product-cell__content {
    padding: 0.75rem;
  }

  .product-cell__heading {
    max-width: calc(50% - 0.5rem);
  }

  .home-logo {
    width: min(68vw, 14rem);
    height: 13rem;
  }

  .home-main[data-active-product] .home-logo {
    width: 5.5rem;
    height: 5.75rem;
  }

  .home-main[data-active-product] .home-logo .brand-lockup {
    transform: scale(0.5);
  }

  .home-main[data-active-product] .home-logo::before,
  .home-main[data-active-product] .home-logo::after {
    font-size: 0.45rem;
    letter-spacing: 0;
  }

  .home-main[data-active-product] .home-logo::before {
    top: 0.35rem;
    left: 0.4rem;
  }

  .home-main[data-active-product] .home-logo::after {
    right: 0.4rem;
    bottom: 0.35rem;
  }

  .product-cell.is-active .product-cell__content {
    overflow: auto;
    overscroll-behavior-y: contain;
    padding: 1rem;
    scrollbar-width: none;
  }

  .product-cell.is-active .product-cell__heading,
  .product-cell.is-active .product-cell__detail {
    width: 100%;
    max-width: none;
  }

  .product-cell.is-active .product-cell__name {
    font-size: clamp(1.35rem, 8vw, 2.2rem);
  }

  .product-cell__detail {
    margin-top: 0.75rem;
  }

  .product-cell__eyebrow {
    padding-bottom: 0.5rem;
  }

  .product-cell__description {
    padding-block: 0.75rem;
    font-size: 0.9rem;
    line-height: 1.55;
  }

  .product-cell__meta {
    padding-top: 0.5rem;
  }

  .product-cell__actions {
    margin-top: 0.75rem;
  }

  .product-cell__scroll-cue {
    margin-top: 0.65rem;
    padding-top: 0.55rem;
    font-size: 0.62rem;
  }

  .product-cell__actions button,
  .product-cell__actions a {
    min-height: 2.75rem;
    padding: 0.45rem 0.65rem;
    font-size: 0.65rem;
  }

  .document-nav {
    padding-inline: 0.75rem;
  }

  .entry-head,
  .entry-sub {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .entry-head span:last-child,
  .entry-sub span:last-child {
    grid-column: 2;
    text-align: left;
  }

  .document-footer {
    font-size: 10px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .document-footer a:nth-of-type(odd) {
    border-left: 0;
  }

  .document-footer a:nth-of-type(n + 3) {
    border-top: 1px solid var(--line);
  }
}

@media (max-height: 560px) {
  .product-cell.is-active .product-cell__content {
    justify-content: flex-start;
    padding: 1rem;
  }
}

@media (prefers-contrast: more) {
  :root {
    --ink-muted: rgba(var(--ink-rgb), 0.82);
    --line: rgba(var(--ink-rgb), 0.58);
    --line-soft: rgba(var(--ink-rgb), 0.34);
    --panel: rgba(var(--ink-rgb), 0.08);
  }
}

@media (forced-colors: active) {
  .home-main,
  .home-intro,
  .main,
  .error-main {
    box-shadow: none;
  }

  .document-footer a {
    opacity: 1;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}