/*
 * Cranium home page.
 *
 * The public face of the firmware console, set the same way: paper, ink and rust, heavy
 * rules and open columns, one ink panel for what matters most, and the arch cut with
 * record grooves. The page has no script. Colours are the console's (app.css), by the
 * same names and with the same meanings: rust is the brand and "your move", blue is the
 * system at work, green is confirmed, amber is caution, red is failed. A test keeps the
 * values the same as the console's.
 *
 * Order: colours and type, the page frame, then each section from the top.
 */

:root {
  color-scheme: light dark;

  --paper: #faf7f2;
  --surface: #fffdfa;
  --well: #f4efe7;
  --line: #e7dfd3;
  --line-strong: #d1c6b6;
  --line-field: #94887a;
  --rule: #1c1814;
  --ink: #1c1814;
  --ink-2: #574e45;
  --ink-3: #72675b;

  --accent: #b7410e;
  --accent-strong: #983509;
  --on-accent: #fffaf5;

  --good: #2d6a3e;
  --warn: #8f5b00;
  --bad: #9c1c3f;
  --bad-wash: #f9e3e6;
  --work: #1c5c94;

  --bar-good: #3f9a68;
  --bar-live: #2a6fa8;
  --bar-act: #b7410e;
  --bar-bad: #a3173d;
  --on-bar-live: #ffffff;
  --on-bar-good: #0e1a12;
  --line-mark: #8a7e70;

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

  --radius: 6px;
  --radius-small: 5px;
  --gutter: clamp(16px, 3.4vw, 48px);
  --page: 1720px;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  /* Where the page's content begins, for what runs out to the edge of the window. */
  --edge: max(var(--gutter), calc((100cqw - var(--page)) / 2 + var(--gutter)));
  --section: clamp(56px, 7vw, 112px);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #171411;
    --surface: #211d19;
    --well: #2a2520;
    --line: #342e28;
    --line-strong: #4a4239;
    --line-field: #7d7166;
    --rule: #6d6257;
    --ink: #f3eee7;
    --ink-2: #c2b8ac;
    --ink-3: #9c9185;

    --accent: #e2703a;
    --accent-strong: #ee8855;
    --on-accent: #1a120c;

    --good: #86c794;
    --warn: #e2b455;
    --bad: #ff9d96;
    --bad-wash: #3a1b20;
    --work: #8abcea;

    --bar-good: #7fcb99;
    --bar-live: #6faee6;
    --bar-act: #e2703a;
    --bar-bad: #d0324a;
    --on-bar-live: #101a24;
    --on-bar-good: #0e1a12;
    --line-mark: #8a7f72;
  }
}

/* An ink panel: the colours of the dark theme, on ink, as in the console. */
.on-ink {
  color-scheme: dark;

  --paper: #1c1814;
  --surface: #1c1814;
  --line: #3a332c;
  --line-strong: #574e44;
  --line-mark: #8a7f72;
  --rule: #f7f2ea;
  --ink: #f7f2ea;
  --ink-2: #d2c8bb;
  --ink-3: #ab9f92;

  --accent: #ef7a41;
  --on-accent: #1a120c;

  --good: #8fd4a0;
  --bad: #ff9d96;
  --bad-wash: #431c22;
  --work: #93c3ef;

  --bar-good: #7fcb99;
  --bar-live: #6faee6;
  --bar-act: #ef7a41;
  --bar-bad: #d0324a;
  --on-bar-live: #101a24;
  --on-bar-good: #0e1a12;

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

@media (prefers-color-scheme: dark) {
  .on-ink {
    --paper: #28241f;
    --surface: #28241f;
    --line: #443e36;
    --line-strong: #61574c;
    --line-mark: #938779;
    --ink-2: #d6ccc0;
    --ink-3: #b5a99c;
    --good: #97dba8;
    --bad: #ffa79c;
    --work: #9ccaf2;
    --bad-wash: #4a2126;

    /* A step above the page is not much on its own: the heaviest rule on the page says it. */
    box-shadow: inset 0 3px 0 var(--ink);
  }
}

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

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

body {
  container-type: inline-size;
  margin: 0;
  min-width: 320px;
  background: var(--paper);
  color: var(--ink);
  font: 1rem/1.55 var(--sans);
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
p,
ul,
ol,
dl,
dd,
figure {
  margin: 0;
  padding: 0;
}

ul,
ol {
  list-style: none;
}

strong {
  font-weight: 600;
}

a {
  color: var(--ink);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--accent);
}

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

main:focus {
  outline: none;
}

.icon {
  flex: none;
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.eyebrow,
.flow-lane {
  color: var(--ink-3);
  font-size: 0.71875rem;
  font-weight: 600;
  letter-spacing: 0.085em;
  line-height: 1.4;
  text-transform: uppercase;
}

.title {
  font-size: clamp(2rem, 1.55rem + 1.7vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.022em;
  line-height: 1.08;
  text-wrap: balance;
}

.eyebrow + .title {
  margin-top: 14px;
}

.body {
  max-width: 38rem;
  margin-top: 16px;
  color: var(--ink-2);
  text-wrap: pretty;
}

.nb {
  white-space: nowrap;
}

section[id] {
  scroll-margin-top: 20px;
}

.caption {
  margin-top: 16px;
  color: var(--ink-3);
  font-size: 0.8125rem;
  text-wrap: pretty;
}

.fig {
  margin-right: 6px;
  color: var(--ink);
  font-weight: 600;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--line-field);
  border-radius: var(--radius-small);
  color: var(--ink);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: -0.006em;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn:hover {
  border-color: var(--ink);
  color: var(--ink);
}

.btn.is-primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--on-accent);
}

.btn.is-primary:hover {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
  color: var(--on-accent);
}

/* The frame. */

.skip {
  position: absolute;
  top: -80px;
  left: var(--gutter);
  z-index: 30;
  padding: 9px 14px;
  border: 1px solid var(--ink);
  border-radius: var(--radius-small);
  background: var(--surface);
  color: var(--ink);
  font-weight: 600;
}

.skip:focus {
  top: 12px;
}

.masthead-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px clamp(20px, 3.6vw, 56px);
  max-width: var(--page);
  min-height: 68px;
  margin: 0 auto;
  padding: 12px var(--gutter);
}

.masthead {
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  flex: none;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  text-decoration: none;
}

.brand:hover {
  color: var(--ink);
}

.brand-mark {
  display: block;
  flex: none;
  width: 30px;
  height: 30px;
}

.brand-dome {
  fill: var(--accent);
}

.brand-grooves {
  fill: none;
  stroke: var(--paper);
  stroke-width: 1.8;
}

.brand-name {
  font-size: 1.1875rem;
  font-weight: 700;
  letter-spacing: -0.028em;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px clamp(16px, 2vw, 30px);
  font-size: 0.9375rem;
}

.nav a {
  color: var(--ink-2);
  text-decoration: none;
}

.nav a:hover {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 6px;
}

.btn.is-console {
  min-height: 38px;
  margin-left: auto;
  padding: 0 15px;
  font-size: 0.875rem;
}

.sheet {
  max-width: var(--page);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* The first screen. */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  border-bottom: 2px solid var(--rule);
}

.hero-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: clamp(48px, 6vw, 104px) clamp(24px, 4vw, 72px) clamp(48px, 6vw, 104px) var(--edge);
}

.hero-state {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-bottom: clamp(18px, 2vw, 28px);
  padding-bottom: 4px;
  border-bottom: 2px solid var(--ink);
  color: var(--ink);
  font-size: 0.875rem;
  font-weight: 600;
}

.hero-state .icon {
  width: 16px;
  height: 16px;
}

.hero-title {
  font-size: clamp(2.5rem, 0.25rem + 5.25vw, 6rem);
  font-weight: 700;
  letter-spacing: -0.026em;
  line-height: 1;
}

.hero-lede {
  max-width: 35rem;
  margin-top: clamp(20px, 2.2vw, 32px);
  font-size: clamp(1.0625rem, 0.98rem + 0.36vw, 1.3125rem);
  letter-spacing: -0.008em;
  line-height: 1.45;
  text-wrap: pretty;
}

.hero-note {
  max-width: 35rem;
  margin-top: 12px;
  color: var(--ink-2);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 2.6vw, 36px);
}

.hero-art {
  position: relative;
  min-height: clamp(280px, 44vw, 720px);
  overflow: hidden;
  background: var(--well);
}

.dome-art {
  position: absolute;
  bottom: 0;
  left: 50%;
  width: min(92%, 680px);
  height: 92%;
  translate: -50% 0;
}

.art-dome {
  fill: var(--accent);
}

.art-groove {
  fill: none;
  stroke: var(--well);
  stroke-width: 2.5;
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  animation: draw 1.6s var(--ease) 100ms forwards;
}

.art-groove:nth-of-type(3) { animation-delay: 170ms; }
.art-groove:nth-of-type(4) { animation-delay: 240ms; }
.art-groove:nth-of-type(5) { animation-delay: 310ms; }
.art-groove:nth-of-type(6) { animation-delay: 380ms; }
.art-groove:nth-of-type(7) { animation-delay: 450ms; }
.art-groove:nth-of-type(8) { animation-delay: 520ms; }
.art-groove:nth-of-type(9) { animation-delay: 590ms; }
.art-groove:nth-of-type(10) { animation-delay: 660ms; }
.art-groove:nth-of-type(11) { animation-delay: 730ms; }

@keyframes draw {
  to {
    stroke-dashoffset: 0;
  }
}

/* What it is. */

.what {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 8fr);
  align-items: start;
  gap: clamp(32px, 5vw, 96px);
  padding-block: var(--section);
}

.path-diagram {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr) minmax(0, 1fr);
  column-gap: clamp(36px, 3.6vw, 56px);
  align-items: stretch;
}

.path-side {
  display: flex;
  flex-direction: column;
  padding-top: 12px;
  border-top: 2px solid var(--rule);
}

.path-list {
  display: flex;
  flex: 1;
  flex-direction: column;
  justify-content: space-around;
  gap: 18px;
  margin-top: 14px;
}

.path-list li {
  position: relative;
  display: grid;
  gap: 2px;
}

.path-list strong {
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
}

.path-list span {
  color: var(--ink-2);
  font-size: 0.875rem;
  line-height: 1.4;
}

/* A wire into the attachment and out of it, with its arrowhead, in the gap between columns. */
.path-list li::before {
  content: "";
  position: absolute;
  top: 0.8em;
  width: clamp(26px, 3vw, 46px);
  height: 2px;
  background: var(--line-mark);
}

.path-list li::after {
  content: "";
  position: absolute;
  top: calc(0.8em - 4px);
  width: 8px;
  height: 10px;
  background: var(--line-mark);
  clip-path: polygon(0 0, 100% 50%, 0 100%);
}

.is-in .path-list li::before {
  left: calc(100% + 5px);
}

.is-in .path-list li::after {
  left: calc(100% + 5px + clamp(26px, 3vw, 46px) - 8px);
}

.is-out .path-list li::before {
  right: calc(100% + 5px);
}

.is-out .path-list li::after {
  right: calc(100% + 5px);
}

.path-unit {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: clamp(14px, 1.5vw, 20px);
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--on-accent);
}

.path-unit-name {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 1.3125rem;
  font-weight: 700;
  letter-spacing: -0.024em;
}

.path-unit-name .brand-mark {
  width: 24px;
  height: 24px;
}

.unit-dome {
  fill: var(--on-accent);
}

.unit-grooves {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.8;
}

.path-parts {
  display: grid;
  flex: 1;
  grid-template-rows: 1fr auto 1fr;
  gap: 0;
}

.path-parts > li:not(.path-link) {
  display: grid;
  align-content: center;
  gap: 2px;
  padding: 12px;
  border: 1.5px solid var(--on-accent);
  border-radius: var(--radius-small);
}

.path-parts strong {
  font-size: 1rem;
  letter-spacing: -0.01em;
}

.path-parts span {
  font-size: 0.8125rem;
  line-height: 1.35;
}

.path-link {
  display: flex;
  align-items: center;
  padding: 10px 0 10px 16px;
  margin-left: 14px;
  border-left: 1.5px dashed var(--on-accent);
}

/* The ink panel. */

.panel {
  padding: clamp(20px, 2.9vw, 40px);
  border-radius: var(--radius);
  scroll-margin-top: 16px;
}

.panel a {
  color: var(--ink);
  text-decoration-color: var(--ink-3);
}

.panel-head .title {
  max-width: 24em;
  font-size: clamp(1.875rem, 1.45rem + 1.9vw, 3rem);
}

.flow-figure {
  margin-top: clamp(32px, 3.6vw, 56px);
}

.flow {
  display: grid;
}

.flow-lanes,
.flow-arc,
.flow-steps {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
}

.flow-lanes {
  order: 1;
}

.flow-arc {
  order: 2;
  height: 58px;
  align-items: end;
}

.flow-steps {
  order: 3;
}

.flow-lane {
  padding-top: 8px;
  border-top: 1px solid var(--line-strong);
}

.flow-lane.is-off {
  grid-column: 1 / 4;
  margin-right: 24px;
}

.flow-lane.is-on {
  grid-column: 4 / 9;
}

/* The way back: from the step on trial to where the board stood before the button. */
.flow-return {
  position: relative;
  grid-column: 4 / 7;
  height: 30px;
  margin-right: -20px;
  margin-left: 19px;
  border: 2px solid var(--bar-bad);
  border-bottom: 0;
  border-radius: 8px 8px 0 0;
}

.flow-return::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: -7px;
  width: 12px;
  height: 9px;
  background: var(--bar-bad);
  clip-path: polygon(0 0, 100% 0, 50% 100%);
}

.flow-return-label {
  position: absolute;
  top: 0;
  left: 50%;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 3px 11px;
  border-radius: 4px;
  background: var(--bad-wash);
  color: var(--ink);
  font-size: 0.875rem;
  font-weight: 600;
  white-space: nowrap;
  translate: -50% -50%;
}

.flow-return-label .icon {
  width: 16px;
  height: 16px;
  color: var(--bad);
}

.flow-step {
  position: relative;
  padding-right: 14px;
}

/* The line to the next step. */
.flow-step::before {
  content: "";
  position: absolute;
  top: 19px;
  right: 0;
  left: 40px;
  height: 2px;
  background: var(--line-mark);
}

.flow-step:last-child::before {
  display: none;
}

.flow-mark {
  position: relative;
  display: grid;
  width: 40px;
  height: 40px;
  border: 1px solid transparent;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  place-items: center;
}

.flow-mark .icon {
  width: 20px;
  height: 20px;
}

.flow-step.is-you .flow-mark {
  background: var(--bar-act);
  color: var(--on-accent);
}

.flow-step.is-work .flow-mark {
  background: var(--bar-live);
  color: var(--on-bar-live);
}

.flow-step.is-good .flow-mark {
  background: var(--bar-good);
  color: var(--on-bar-good);
}

.flow-text {
  display: grid;
  gap: 2px;
  margin-top: 12px;
}

.flow-label {
  overflow-wrap: anywhere;
  hyphens: auto;
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: -0.008em;
  line-height: 1.3;
}

.flow-word {
  color: var(--ink-2);
  font-size: 0.8125rem;
  line-height: 1.35;
  text-wrap: pretty;
}

.locks {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0 clamp(20px, 2.6vw, 40px);
  margin-top: clamp(28px, 3vw, 44px);
}

.lock {
  padding-top: 14px;
  border-top: 1px solid var(--line-strong);
}

.lock p {
  margin-top: 8px;
  color: var(--ink-2);
  font-size: 0.9375rem;
  line-height: 1.5;
  text-wrap: pretty;
}

.lock-title {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.012em;
  line-height: 1.3;
}

.lock-title .icon {
  margin-top: 2px;
}

.lock.is-you .icon {
  color: var(--accent);
}

.lock.is-work .icon {
  color: var(--work);
}

.lock.is-bad .icon {
  color: var(--bad);
}

/* Failures and the specification: a heading beside rows of facts. */

.split {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 8fr);
  align-items: start;
  gap: 24px clamp(32px, 5vw, 96px);
  margin-top: var(--section);
}

.split-head,
.spec,
.split > .rows {
  padding-top: 20px;
  border-top: 2px solid var(--rule);
}

.split-head .ports {
  margin-top: clamp(24px, 2.6vw, 36px);
}

.rows {
  display: grid;
}

.row {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 8fr);
  gap: 4px clamp(20px, 2.6vw, 40px);
  padding-block: 14px;
  border-top: 1px solid var(--line);
}

.rows > .row:first-child {
  padding-top: 0;
  border-top: 0;
}

.row dt {
  font-weight: 600;
  letter-spacing: -0.008em;
  line-height: 1.4;
  text-wrap: pretty;
}

.row dd {
  color: var(--ink-2);
  text-wrap: pretty;
}

.figures {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0 clamp(20px, 2.6vw, 40px);
}

.figure {
  display: flex;
  flex-direction: column-reverse;
  justify-content: flex-end;
  gap: 4px;
}

.figure dt {
  color: var(--ink-2);
  font-size: 0.875rem;
  line-height: 1.35;
  text-wrap: balance;
}

.figure dd {
  font-size: clamp(2.75rem, 2.2rem + 2vw, 3.5rem);
  font-weight: 600;
  font-feature-settings: "tnum" 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
  line-height: 1;
}

.unit {
  margin-left: 0.08em;
  color: var(--ink-3);
  font-size: 0.5em;
  font-weight: 600;
  letter-spacing: 0;
}

.ports {
  max-width: 38rem;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.ports-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px 8px;
}

.port {
  display: grid;
  justify-items: start;
  gap: 6px;
  font-size: 0.8125rem;
  font-weight: 500;
  line-height: 1.25;
}

.port svg {
  display: block;
  width: 48px;
  height: 48px;
  margin-left: -4px;
  fill: none;
  stroke: var(--ink);
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.port .pin {
  fill: var(--ink);
  stroke: none;
}

.spec .rows {
  margin-top: clamp(20px, 2.4vw, 32px);
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

/* Where it stands. */

.status {
  margin-top: var(--section);
}

.status-head {
  padding-top: 20px;
  border-top: 2px solid var(--rule);
}

.status-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px clamp(24px, 4vw, 64px);
  margin-top: clamp(24px, 3vw, 44px);
}

.state p,
.limits {
  margin-top: 8px;
  color: var(--ink-2);
  text-wrap: pretty;
}

.limits {
  display: grid;
  gap: 6px;
}

.state-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.012em;
}

.state .icon {
  color: var(--ink-3);
}

.state.is-good .icon {
  color: var(--good);
}

.state.is-warn .icon {
  color: var(--warn);
}

.measured {
  margin-top: clamp(28px, 3.4vw, 48px);
  padding-top: 14px;
  border-top: 2px solid var(--rule);
}

.measured .caption {
  margin-top: 16px;
}

.exits {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(24px, 4vw, 64px);
  margin-top: clamp(40px, 4.6vw, 72px);
}

.exit {
  display: grid;
  align-content: start;
  gap: 8px;
  padding-block: 20px 8px;
  border-top: 2px solid var(--rule);
  color: var(--ink);
  text-decoration: none;
}

.exit:hover {
  color: var(--ink);
}

.exit-name {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: clamp(1.625rem, 1.4rem + 1vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.022em;
  line-height: 1.1;
}

.exit-name .icon {
  width: 26px;
  height: 26px;
  transition: translate 0.2s var(--ease);
}

.exit:hover .exit-name {
  color: var(--accent);
}

.exit:hover .icon {
  translate: 5px 0;
}

.exit-text {
  max-width: 38rem;
  color: var(--ink-2);
  text-wrap: pretty;
}

.foot {
  margin-top: var(--section);
  border-top: 1px solid var(--line);
}

.foot-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  max-width: var(--page);
  margin-inline: auto;
  padding: 20px var(--gutter) 28px;
}

.foot-brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.foot-brand .brand-mark {
  width: 22px;
  height: 22px;
}

.foot-text {
  color: var(--ink-3);
  font-size: 0.875rem;
}

/* Narrower screens. */

/*
 * The headings go above what they head. Fig. 2 becomes a column, with the steps down the
 * left and the way back drawn beside them, because the words on the arc need the width
 * of three steps. Its explanations stand next to it for as long as there is room.
 */
@media (max-width: 1180px) {
  .what,
  .split {
    grid-template-columns: minmax(0, 1fr);
  }

  .what-copy {
    max-width: 44rem;
  }

  .panel {
    display: grid;
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1fr);
    gap: 32px clamp(28px, 4vw, 56px);
  }

  .panel-head {
    grid-column: 1 / -1;
  }

  .flow-figure,
  .locks {
    margin-top: 0;
  }

  .flow-lanes {
    display: none;
  }

  .flow-steps {
    display: block;
    order: 1;
    padding-left: 26px;
  }

  .flow-arc {
    display: block;
    order: 2;
    height: auto;
    margin-top: 14px;
  }

  .flow-step {
    display: grid;
    grid-template-columns: 40px minmax(0, 1fr);
    column-gap: 14px;
    min-height: 40px;
    padding: 0 0 20px;
  }

  .flow-step:last-child {
    padding-bottom: 0;
  }

  .flow-step::before {
    top: 40px;
    right: auto;
    bottom: 0;
    left: 19px;
    width: 2px;
    height: auto;
  }

  .flow-text {
    align-content: start;
    margin-top: 0;
    padding-top: 1px;
  }

  /* The way back, one piece per step. */
  .flow-step.is-arc::after,
  .flow-step.is-arc-end::after,
  .flow-step.is-arc-start::after {
    content: "";
    position: absolute;
    left: -22px;
    border-color: var(--bar-bad);
    border-style: solid;
    border-width: 0;
  }

  .flow-step.is-arc::after {
    top: 0;
    bottom: 0;
    border-left-width: 2px;
  }

  .flow-step.is-arc-end::after {
    top: 19px;
    bottom: 0;
    width: 14px;
    border-top-width: 2px;
    border-left-width: 2px;
    border-top-left-radius: 8px;
  }

  .flow-step.is-arc-start::after {
    top: 0;
    width: 22px;
    height: 21px;
    border-bottom-width: 2px;
    border-left-width: 2px;
    border-bottom-left-radius: 8px;
  }

  /* The arrowhead, into the step where the board stood before the button. */
  .flow-step.is-arc-end .flow-mark::before {
    content: "";
    position: absolute;
    top: 13px;
    left: -9px;
    width: 9px;
    height: 12px;
    background: var(--bar-bad);
    clip-path: polygon(0 0, 100% 50%, 0 100%);
  }

  .flow-return {
    display: flex;
    height: auto;
    margin: 0;
    padding: 9px 12px;
    border: 0;
    border-left: 3px solid var(--bar-bad);
    border-radius: 4px;
    background: var(--bad-wash);
  }

  .flow-return::before {
    display: none;
  }

  .flow-return-label {
    position: static;
    align-items: flex-start;
    padding: 0;
    background: none;
    white-space: normal;
    translate: none;
  }

  .flow-return-label .icon {
    margin-top: 3px;
  }

  .locks {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
  }

  .ports {
    max-width: none;
  }

  .ports-list {
    grid-template-columns: repeat(7, minmax(0, 1fr));
  }
}

@media (max-width: 860px) {
  .hero {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-copy {
    padding: 44px var(--gutter) 36px;
  }

  .hero-title {
    font-size: clamp(2.25rem, 0.25rem + 9.7vw, 5rem);
  }

  .hero-art {
    min-height: clamp(220px, 58vw, 420px);
  }

  /* Larger than its frame, which cuts it off: on a phone the arch is the picture. */
  .dome-art {
    top: clamp(24px, 6vw, 48px);
    bottom: auto;
    width: min(84%, 560px);
    height: auto;
    aspect-ratio: 1;
  }

  .status-columns {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .exits {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .nav {
    order: 3;
    flex-basis: 100%;
  }
}

/* Too narrow for two columns of Fig. 2, and for the sideways wires of Fig. 1. */
@media (max-width: 720px) {
  .panel {
    grid-template-columns: minmax(0, 1fr);
  }

  .path-diagram {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 34px;
  }

  .path-list li::before,
  .path-list li::after {
    display: none;
  }

  .path-side.is-in,
  .path-unit {
    position: relative;
  }

  .path-side.is-in::after,
  .path-unit::after {
    content: "";
    position: absolute;
    bottom: -28px;
    left: 19px;
    width: 12px;
    height: 22px;
    background: var(--line-mark);
    clip-path: polygon(40% 0, 60% 0, 60% 60%, 100% 60%, 50% 100%, 0 60%, 40% 60%);
  }

  .path-parts {
    grid-template-rows: auto;
  }

  .row {
    grid-template-columns: minmax(0, 1fr);
  }

  .ports-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .figures {
    gap: 0 14px;
  }
}

@media (max-width: 460px) {
  .nav {
    display: none;
  }

  .hero-actions,
  .hero-actions .btn {
    width: 100%;
  }

  /* Larger text must be able to wrap here rather than run off the screen. */
  .hero-actions .btn {
    padding-block: 8px;
    text-align: center;
    white-space: normal;
  }

  .figure dt {
    font-size: 0.8125rem;
  }
}

/* A window that has asked for no motion gets everything at rest, the grooves drawn. */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .art-groove {
    stroke-dashoffset: 0;
  }
}

/* The system's own colours: fills and marks that are only colour have to be told. */
@media (forced-colors: active) {
  .art-dome,
  .brand-dome,
  .unit-dome {
    fill: CanvasText;
  }

  .art-groove,
  .brand-grooves,
  .unit-grooves {
    stroke: Canvas;
  }

  .flow-step::before,
  .flow-return::before,
  .flow-step.is-arc-end .flow-mark::before,
  .path-list li::before,
  .path-list li::after,
  .path-side.is-in::after,
  .path-unit::after {
    background: CanvasText;
    forced-color-adjust: none;
  }

  /* Their fills are gone here, so what they held together needs an edge. */
  .panel,
  .path-unit {
    border: 1px solid CanvasText;
  }

  .path-parts > li:not(.path-link) {
    border-color: CanvasText;
  }

  .path-link {
    border-left-color: CanvasText;
  }

  .flow-return,
  .flow-step.is-arc::after,
  .flow-step.is-arc-end::after,
  .flow-step.is-arc-start::after {
    border-color: CanvasText;
  }

  .port .pin {
    fill: CanvasText;
  }

  .port svg {
    stroke: CanvasText;
  }
}