/*
 * PATINA public stylesheet.
 *
 * One file, custom properties, dark first with a light layer that is designed
 * rather than inverted. No imports, no external fonts, no frameworks.
 *
 * The token vocabulary here is identical to docs/assets/style.css. The two
 * trees are one product at two depths, so they share the same names and the
 * same values. tools/check-site.mjs proves the shared tokens stay in step and
 * docs/tools/check-contrast.mjs proves both files meet WCAG AA in both themes.
 *
 * The visual language comes from the protocol: engraved plates, strata laid
 * down block by block, ring cross sections cut open at the top, bronze that
 * ages into verdigris as depth grows.
 */

/* ------------------------------------------------------------ shared tokens */

:root {
  color-scheme: dark;

  --bg:            #14110d;
  --bg-deep:       #0d0b08;
  --surface:       #1b1712;
  --surface-2:     #232019;
  --rule:          #352d24;
  --rule-strong:   #52463a;
  --edge:          #7d7161;
  --ink:           #f0e8dc;
  --ink-2:         #cdbfab;
  --ink-3:         #a4977f;
  --bronze:        #e0a463;
  --bronze-deep:   #b97a3c;
  --verdigris:     #6cc7ab;
  --verdigris-deep: #2f7d68;
  --umber:         #c08658;
  --alert:         #f0937f;
  --focus:         #ffd28f;

  --code-bg:       #100d0a;
  --code-ink:      #ece3d4;
  --code-rule:     #3a3128;
  --code-accent:   #b97a3c;

  --plate:         #191510;

  /* Tier ramp. Cold raw metal, through cast bronze and earth, into verdigris. */
  --t0: #9a9086;
  --t1: #d8b57e;
  --t2: #c9954f;
  --t3: #b6a05a;
  --t4: #a89464;
  --t5: #8aa472;
  --t6: #63b294;
  --t7: #4ab7a4;

  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --radius: 3px;
}

:root[data-theme="light"] {
  color-scheme: light;

  --bg:            #f3eee3;
  --bg-deep:       #e7dfd0;
  --surface:       #fdfaf3;
  --surface-2:     #f6f0e3;
  --rule:          #dcd0ba;
  --rule-strong:   #b9a888;
  --edge:          #8a7c66;
  --ink:           #1d1811;
  --ink-2:         #453c30;
  --ink-3:         #62563f;
  --bronze:        #86500f;
  --bronze-deep:   #6d4009;
  --verdigris:     #0e6250;
  --verdigris-deep: #0a4b3d;
  --umber:         #7c4a22;
  --alert:         #9b2f16;
  --focus:         #7a4a10;

  --code-bg:       #17130f;
  --code-ink:      #ece3d4;
  --code-rule:     #3a3128;
  --code-accent:   #b97a3c;

  --plate:         #fffdf7;

  --t0: #5b544c;
  --t1: #8a6117;
  --t2: #7d5410;
  --t3: #695a17;
  --t4: #61511d;
  --t5: #435f33;
  --t6: #1c6a53;
  --t7: #135f4d;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    color-scheme: light;

    --bg:            #f3eee3;
    --bg-deep:       #e7dfd0;
    --surface:       #fdfaf3;
    --surface-2:     #f6f0e3;
    --rule:          #dcd0ba;
    --rule-strong:   #b9a888;
    --edge:          #8a7c66;
    --ink:           #1d1811;
    --ink-2:         #453c30;
    --ink-3:         #62563f;
    --bronze:        #86500f;
    --bronze-deep:   #6d4009;
    --verdigris:     #0e6250;
    --verdigris-deep: #0a4b3d;
    --umber:         #7c4a22;
    --alert:         #9b2f16;
    --focus:         #7a4a10;

    --plate:         #fffdf7;

    --t0: #5b544c;
    --t1: #8a6117;
    --t2: #7d5410;
    --t3: #695a17;
    --t4: #61511d;
    --t5: #435f33;
    --t6: #1c6a53;
    --t7: #135f4d;
  }
}

/* ------------------------------------------------------ page level measures */

:root {
  --gutter: clamp(1.15rem, 4.5vw, 3rem);
  --page-max: 78rem;
  --measure: 64ch;
  --header-h: 3.5rem;
}

/* Tier colour applied by index, so markup names a tier and never a colour. */
[data-tier="0"] { --tier-ink: var(--t0); }
[data-tier="1"] { --tier-ink: var(--t1); }
[data-tier="2"] { --tier-ink: var(--t2); }
[data-tier="3"] { --tier-ink: var(--t3); }
[data-tier="4"] { --tier-ink: var(--t4); }
[data-tier="5"] { --tier-ink: var(--t5); }
[data-tier="6"] { --tier-ink: var(--t6); }
[data-tier="7"] { --tier-ink: var(--t7); }

/* ------------------------------------------------------------------- base */

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

/*
 * The hidden attribute has to beat the display rules further down, otherwise a
 * hidden panel reappears the moment it is given display: grid.
 */
[hidden] {
  display: none !important;
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.62 var(--sans);
  overflow-wrap: break-word;
}

/* Strata: sediment laid down behind the whole page, one faint layer at a time. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    to bottom,
    color-mix(in srgb, var(--rule) 40%, transparent) 0 1px,
    transparent 1px 7rem
  );
  opacity: 0.55;
}

::selection {
  background: color-mix(in srgb, var(--verdigris) 32%, transparent);
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.15;
  color: var(--ink);
  margin: 0 0 0.55em;
  text-wrap: balance;
}

h1 {
  font-size: clamp(2.05rem, 1.2rem + 3.6vw, 3.5rem);
  letter-spacing: -0.015em;
}

h2 {
  font-size: clamp(1.55rem, 1.1rem + 1.8vw, 2.2rem);
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(1.12rem, 1rem + 0.6vw, 1.32rem);
}

h4 {
  font-family: var(--sans);
  font-size: 0.96rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

p, ul, ol, dl {
  margin: 0 0 1.05em;
}

ul, ol {
  padding-left: 1.2em;
}

li {
  margin-bottom: 0.3em;
}

li::marker {
  color: var(--bronze-deep);
}

a {
  color: var(--bronze);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.16em;
}

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

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

strong, b {
  font-weight: 600;
  color: var(--ink);
}

code, kbd, samp {
  font-family: var(--mono);
  font-size: 0.9em;
}

p code,
li code,
td code,
dd code {
  background: color-mix(in srgb, var(--rule) 50%, transparent);
  border-radius: 2px;
  padding: 0.08em 0.34em;
  white-space: nowrap;
}

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 2.6rem 0;
}

img, svg {
  max-width: 100%;
}

abbr[title] {
  text-decoration: underline dotted var(--rule-strong);
  cursor: help;
}

/* --------------------------------------------------------------- skip link */

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 90;
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--edge);
  padding: 0.6rem 1rem;
}

.skip:focus {
  left: 0.5rem;
  top: 0.5rem;
}

/* --------------------------------------------------------- layout measures */

.wrap {
  width: 100%;
  max-width: var(--page-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.prose {
  max-width: var(--measure);
}

.prose > :last-child {
  margin-bottom: 0;
}

main {
  display: block;
  padding-bottom: 4rem;
}

section {
  margin-bottom: clamp(3rem, 7vw, 5.5rem);
}

/*
 * A band is a stratum: it starts on a scribed line and carries a block height
 * style index in the margin on wide screens.
 */
.band {
  border-top: 1px solid var(--rule);
  padding-top: clamp(2rem, 4vw, 3.2rem);
}

.lede {
  font-size: clamp(1.06rem, 0.98rem + 0.5vw, 1.28rem);
  color: var(--ink-2);
  max-width: 54ch;
  line-height: 1.55;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--bronze);
  margin: 0 0 0.9rem;
}

.eyebrow::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--rule-strong), transparent);
}

.eyebrow .num {
  font-variant-numeric: tabular-nums;
  color: var(--ink-3);
}

.small {
  font-size: 0.86rem;
  color: var(--ink-2);
}

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

.mono {
  font-family: var(--mono);
}

.nowrap {
  white-space: nowrap;
}

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

/* ----------------------------------------------------------------- header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 93%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}

@supports not (backdrop-filter: blur(2px)) {
  .site-header {
    background: var(--bg);
  }
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--ink);
  flex: 0 0 auto;
  padding: 0.4rem 0;
}

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

.brand svg {
  display: block;
  width: 1.65rem;
  height: 1.65rem;
  flex: 0 0 auto;
}

.brand-name {
  font-family: var(--serif);
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.site-nav {
  flex: 1 1 auto;
  min-width: 0;
}

.site-nav > ul {
  list-style: none;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.1rem;
  margin: 0;
  padding: 0;
}

.site-nav li {
  margin: 0;
  flex: 0 0 auto;
}

.site-nav a {
  display: flex;
  align-items: center;
  min-height: 2.6rem;
  padding: 0.5rem 0.62rem;
  font-size: 0.88rem;
  text-decoration: none;
  color: var(--ink-2);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}

.site-nav a:hover {
  color: var(--ink);
  border-bottom-color: var(--rule-strong);
}

.site-nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--bronze);
}

.site-nav a.to-docs {
  color: var(--verdigris);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex: 0 0 auto;
}

/*
 * The whole primary nav collapses into a drawer below the wide breakpoint.
 * The drawer carries more links than the bar does, because a drawer has room
 * and a bar that tries to hold everything just scrolls sideways.
 *
 * Every drawer rule is scoped to [data-open], which the script writes on
 * startup. With scripts unavailable the attribute never appears, so the nav
 * stays an ordinary wrapped list of links and the button that would have
 * opened it never shows up. A phone without JavaScript keeps its navigation.
 */
.menu-toggle {
  display: none;
}

@media (min-width: 66.01rem) {
  .nav-more {
    display: none;
  }
}

@media (max-width: 66rem) {
  .site-nav[data-open] {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    z-index: 45;
    display: none;
    background: var(--bg-deep);
    border-bottom: 1px solid var(--rule);
    box-shadow: 0 18px 34px rgba(0, 0, 0, 0.4);
    max-height: calc(100dvh - var(--header-h));
    overflow-y: auto;
  }

  .site-nav[data-open="true"] {
    display: block;
  }

  .site-nav[data-open] > ul {
    display: block;
    padding: 0.5rem var(--gutter) 1.2rem;
  }

  .site-nav[data-open] a {
    min-height: 3rem;
    padding: 0.7rem 0.2rem;
    font-size: 1rem;
    border-bottom: 1px solid var(--rule);
  }

  .site-nav[data-open] a[aria-current="page"] {
    border-bottom-color: var(--rule);
    box-shadow: inset 3px 0 0 var(--bronze);
    padding-left: 0.8rem;
  }

  /* The button only appears once something can act on it. */
  .site-nav[data-open] ~ .header-tools .menu-toggle {
    display: inline-flex;
  }

  /* Without the drawer the header stacks rather than squeezing. */
  .header-inner {
    flex-wrap: wrap;
    padding-block: 0.4rem;
  }
}

/* ----------------------------------------------------------------- buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.85rem;
  padding: 0.6rem 1.15rem;
  font: inherit;
  font-size: 0.94rem;
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
  cursor: pointer;
  text-align: center;
}

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

.btn-primary {
  background: var(--bronze);
  border-color: var(--bronze);
  color: var(--bg-deep);
  font-weight: 600;
}

.btn-primary:hover {
  background: var(--verdigris);
  border-color: var(--verdigris);
  color: var(--bg-deep);
}

.btn-quiet {
  background: transparent;
  border-color: var(--rule-strong);
  color: var(--ink-2);
}

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

.btn-small {
  min-height: 2.4rem;
  padding: 0.35rem 0.7rem;
  font-size: 0.82rem;
}

@media (pointer: coarse) {
  .btn-small {
    min-height: 2.85rem;
    padding: 0.55rem 0.9rem;
  }
}

.btn[aria-disabled="true"] {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn[aria-pressed="true"] {
  border-color: var(--bronze);
  background: var(--surface-2);
  color: var(--ink);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin: 1.6rem 0 0;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  padding: 0.2rem 0.62rem;
  color: var(--ink-2);
  white-space: nowrap;
}

.pill-live {
  border-color: var(--verdigris-deep);
  color: var(--verdigris);
}

.pill-sim {
  border-color: var(--rule-strong);
  color: var(--ink-3);
  background: var(--surface-2);
}

/* -------------------------------------------------------------------- hero */

.hero {
  padding-top: clamp(2rem, 5vw, 4.2rem);
  padding-bottom: clamp(1.5rem, 3vw, 2.5rem);
}

/*
 * Deliberately asymmetric: the specimen is the larger half and it sits first
 * in the reading order on a phone, because the object is the argument.
 */
.hero-grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3.4rem);
  grid-template-columns: 1fr;
  align-items: start;
}

@media (min-width: 62rem) {
  .hero-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1.18fr);
  }
}

.hero-copy h1 {
  margin-bottom: 0.4rem;
}

.hero-copy .lede {
  margin-bottom: 1.4rem;
}

/* The three facts under the headline, engraved as a ruled ledger. */
.ledger {
  list-style: none;
  padding: 0;
  margin: 1.6rem 0 0;
  border-top: 1px solid var(--rule);
}

.ledger > li {
  margin: 0;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--rule);
  display: grid;
  gap: 0.15rem 1.1rem;
  grid-template-columns: 1fr;
}

@media (min-width: 34rem) {
  .ledger > li {
    grid-template-columns: 8.5rem 1fr;
  }
}

.ledger-key {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--bronze);
  padding-top: 0.3em;
}

.ledger-val {
  margin: 0;
  color: var(--ink-2);
}

.ledger-val strong {
  color: var(--ink);
}

/* ---------------------------------------------------------------- specimen */

/*
 * The specimen is the hero object: a cut section of an artifact whose filled
 * radius is its depth and whose scribed circles are the tier thresholds.
 */
.specimen {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 90% at 50% 0%, color-mix(in srgb, var(--surface-2) 70%, transparent), transparent 70%),
    var(--plate);
  padding: clamp(0.9rem, 2.4vw, 1.5rem);
  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--ink) 8%, transparent);
}

.specimen-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.7rem;
  margin-bottom: 0.9rem;
}

.specimen-head h2 {
  margin: 0;
  font-size: 0.78rem;
  font-family: var(--mono);
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.specimen-stage {
  display: grid;
  gap: clamp(0.8rem, 2vw, 1.3rem);
  grid-template-columns: 1fr;
  align-items: center;
}

@media (min-width: 30rem) {
  .specimen-stage {
    grid-template-columns: minmax(0, 1fr) minmax(9.5rem, 0.72fr);
  }
}

.specimen-cut {
  margin: 0;
  display: block;
  width: 100%;
  height: auto;
}

.specimen-readout {
  margin: 0;
  display: grid;
  gap: 0.55rem;
}

.specimen-readout > div {
  border-left: 2px solid var(--rule-strong);
  padding-left: 0.7rem;
}

.specimen-readout dt {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 0.1rem;
}

.specimen-readout dd {
  margin: 0;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.15rem, 1rem + 1vw, 1.6rem);
  line-height: 1.2;
  color: var(--ink);
}

.specimen-readout .tier-name {
  font-family: var(--serif);
  font-size: clamp(1.2rem, 1rem + 1.1vw, 1.7rem);
  color: var(--tier-ink, var(--bronze));
}

.specimen-readout .sub {
  display: block;
  font-family: var(--sans);
  font-size: 0.78rem;
  color: var(--ink-3);
  letter-spacing: 0;
  margin-top: 0.15rem;
}

/* Progress toward the next threshold, drawn as a filled scribe line. */
.progress-rail {
  position: relative;
  height: 6px;
  margin-top: 0.35rem;
  background: var(--surface-2);
  border: 1px solid var(--rule);
  border-radius: 999px;
  overflow: hidden;
}

.progress-rail > span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--tier-ink, var(--bronze));
}

.specimen-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  border-top: 1px solid var(--rule);
  margin-top: 0.9rem;
  padding-top: 0.8rem;
}

.specimen-foot .note-line {
  margin: 0;
  font-size: 0.78rem;
  color: var(--ink-3);
  flex: 1 1 12rem;
}

/*
 * Completed stretches. The big disc resets on every move, these do not, which
 * is the whole distinction the page has to make unmistakable.
 */
.ring-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 0.45rem;
  margin: 0;
  min-height: 2.9rem;
}

.ring-row:empty::after {
  content: "No stretch has closed yet.";
  font-size: 0.78rem;
  color: var(--ink-3);
}

.ring-chip {
  display: grid;
  justify-items: center;
  gap: 0.15rem;
  width: 3.1rem;
}

.ring-chip-face {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  border: 1px solid var(--rule-strong);
  background:
    repeating-radial-gradient(
      circle at 50% 50%,
      var(--tier-ink) 0 1px,
      transparent 1px 3px
    ),
    color-mix(in srgb, var(--tier-ink) 26%, var(--surface));
}

.ring-chip-label {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}

/* The strata column that the passage of blocks paints into. */
.strata-column .s-rule {
  stroke: var(--rule-strong);
  stroke-width: 1;
  fill: none;
}

.strata-column .s-scribe {
  stroke: var(--rule-strong);
  stroke-width: 1;
  stroke-dasharray: 2 4;
  fill: none;
}

.strata-column .s-label {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  fill: var(--ink-3);
}

.strata-column .s-marker {
  stroke: var(--bronze);
  stroke-width: 1.5;
  fill: none;
}

.strata-column .s-depth {
  font-family: var(--mono);
  font-size: 11px;
  fill: var(--bronze);
}

.strata-readout {
  display: block;
  font-family: var(--mono);
  font-size: 0.9rem;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

/* Mint steps read as ordinary sections until the wizard takes them over. */
.wizard-step {
  padding: clamp(1.1rem, 3vw, 1.8rem);
  border-bottom: 1px solid var(--rule);
}

.wizard-step:last-of-type {
  border-bottom: 0;
}

.wizard-step > h3:first-child {
  margin-top: 0;
}

/* --------------------------------------------------------- plates and cards */

.plate {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: clamp(1rem, 2.6vw, 1.5rem);
}

.plate > :last-child {
  margin-bottom: 0;
}

.plate-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.plate-title h2,
.plate-title h3 {
  margin: 0;
  font-size: 1.1rem;
}

.grid {
  display: grid;
  gap: 1.2rem;
  grid-template-columns: 1fr;
}

@media (min-width: 46rem) {
  .grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 46rem) and (max-width: 61.99rem) {
  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 62rem) {
  .grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ------------------------------------------------------------- live panels */

.panel-state {
  display: flex;
  gap: 0.7rem;
  align-items: flex-start;
  font-size: 0.89rem;
  color: var(--ink-2);
  border: 1px dashed var(--rule-strong);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  background: var(--surface-2);
}

.panel-state[data-tone="error"] {
  border-color: var(--alert);
  border-style: solid;
  color: var(--ink);
}

.panel-state[data-tone="ok"] {
  border-style: solid;
  border-color: var(--rule);
}

.panel-state p {
  margin: 0 0 0.4rem;
}

.panel-state p:last-child {
  margin-bottom: 0;
}

.state-dot {
  flex: 0 0 auto;
  width: 0.6rem;
  height: 0.6rem;
  margin-top: 0.48rem;
  border-radius: 50%;
  background: var(--ink-3);
}

.panel-state[data-tone="error"] .state-dot {
  background: var(--alert);
}

.panel-state[data-tone="ok"] .state-dot {
  background: var(--verdigris);
}

.stat-grid {
  display: grid;
  gap: 1px;
  grid-template-columns: repeat(auto-fit, minmax(10.5rem, 1fr));
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 0;
}

.stat {
  background: var(--surface);
  padding: 0.9rem 1rem;
  margin: 0;
}

.stat dt {
  font-size: 0.68rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-family: var(--mono);
  margin: 0 0 0.3rem;
}

.stat dd {
  margin: 0;
  font-family: var(--mono);
  font-size: clamp(1.1rem, 1rem + 0.6vw, 1.4rem);
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  word-break: break-word;
}

.stat dd .unit {
  font-size: 0.68em;
  color: var(--ink-3);
  margin-left: 0.3em;
}

.stat dd.faint,
.specimen-readout dd.faint {
  color: var(--ink-3);
  font-size: 0.95rem;
}

.source-note {
  font-size: 0.76rem;
  color: var(--ink-3);
  font-family: var(--mono);
  margin: 0.8rem 0 0;
}

.override-banner {
  border: 1px solid var(--umber);
  border-radius: var(--radius);
  background: var(--surface-2);
  padding: 0.75rem 1rem;
  font-size: 0.87rem;
  margin-bottom: 1.4rem;
}

/* ------------------------------------------------------------ tier journey */

.ladder {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
}

.ladder > li {
  margin: 0;
  background: var(--surface);
  position: relative;
}

.ladder > li[data-reached="true"] {
  background: var(--surface-2);
}

.ladder > li[data-current="true"] {
  box-shadow: inset 3px 0 0 var(--tier-ink, var(--bronze));
}

.rung {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr) auto;
  gap: 0.5rem 0.9rem;
  align-items: center;
  padding: 0.85rem 1rem;
}

@media (min-width: 46rem) {
  .rung {
    grid-template-columns: 2.6rem 9rem minmax(0, 1fr) 7rem;
  }
}

/*
 * Each tier gets a material chip rather than a flat dot: a cut disc whose
 * banding thickens as the ladder climbs.
 */
.chip {
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 50%;
  border: 1px solid var(--rule-strong);
  background:
    repeating-radial-gradient(
      circle at 50% 50%,
      var(--tier-ink) 0 1px,
      transparent 1px calc(1px + var(--chip-gap, 3px))
    ),
    color-mix(in srgb, var(--tier-ink) 22%, var(--surface));
  flex: 0 0 auto;
}

.ladder > li[data-reached="false"] .chip {
  opacity: 0.42;
  filter: saturate(0.5);
}

.rung-name {
  font-family: var(--serif);
  font-size: 1.14rem;
  font-weight: 600;
  color: var(--tier-ink, var(--ink));
  margin: 0;
}

.rung-desc {
  margin: 0;
  font-size: 0.88rem;
  color: var(--ink-2);
  grid-column: 2 / -1;
}

@media (min-width: 46rem) {
  .rung-desc {
    grid-column: 3;
  }
}

.rung-blocks {
  font-family: var(--mono);
  font-size: 0.84rem;
  color: var(--ink-2);
  font-variant-numeric: tabular-nums;
  text-align: right;
  grid-column: 3;
  grid-row: 1;
  align-self: start;
}

@media (min-width: 46rem) {
  .rung-blocks {
    grid-column: 4;
  }
}

.rung-blocks .est {
  display: block;
  font-size: 0.74rem;
  color: var(--ink-3);
  font-family: var(--sans);
}

.rung-state {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  grid-column: 2 / -1;
}

/*
 * Tier cards. One card per tier, drawn from the same geometry as the specimen
 * so a card and the live object are recognisably the same system. Nothing on a
 * card is a promise: a tier is a name for a band of depth and nothing else.
 */
.tier-cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
}

.tier-cards > li {
  margin: 0;
}

.tier-card {
  height: 100%;
  border: 1px solid var(--rule);
  border-top: 3px solid var(--tier-ink, var(--bronze));
  border-radius: var(--radius);
  background:
    radial-gradient(110% 80% at 50% 0%, color-mix(in srgb, var(--tier-ink) 12%, transparent), transparent 68%),
    var(--surface);
  padding: 1rem 1.1rem 1.15rem;
  display: grid;
  gap: 0.55rem;
  align-content: start;
}

.tier-card-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.6rem;
}

.tier-card h3 {
  margin: 0;
  font-size: 1.35rem;
  color: var(--tier-ink, var(--ink));
}

.tier-card .index {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--ink-3);
}

.tier-card svg {
  display: block;
  width: 100%;
  max-width: 9rem;
  height: auto;
  margin: 0.2rem auto 0.4rem;
}

.tier-card .threshold {
  margin: 0;
  font-family: var(--mono);
  font-size: 1.05rem;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.tier-card .threshold small {
  display: block;
  font-family: var(--sans);
  font-size: 0.76rem;
  color: var(--ink-3);
  letter-spacing: 0;
}

.tier-card .material {
  margin: 0;
  font-size: 0.89rem;
  color: var(--ink-2);
}

.tier-card .exact {
  margin: 0;
  border-top: 1px solid var(--rule);
  padding-top: 0.55rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}

/* ---------------------------------------------------------------- anatomy */

.anatomy {
  display: grid;
  gap: clamp(1rem, 3vw, 2rem);
  grid-template-columns: 1fr;
  align-items: start;
}

@media (min-width: 58rem) {
  .anatomy {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  }
}

.anatomy-figure {
  margin: 0;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--plate);
  padding: clamp(0.8rem, 2vw, 1.2rem);
}

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

.anatomy-parts {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.anatomy-parts li {
  margin: 0;
}

.part-btn {
  font: inherit;
  font-size: 0.83rem;
  min-height: 2.4rem;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink-2);
  cursor: pointer;
}

@media (pointer: coarse) {
  .part-btn {
    min-height: 2.85rem;
  }
}

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

.part-btn[aria-pressed="true"] {
  background: var(--surface-2);
  border-color: var(--bronze);
  color: var(--ink);
  box-shadow: inset 0 -2px 0 var(--bronze);
}

.part-detail {
  border: 1px solid var(--rule);
  border-left: 3px solid var(--bronze);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 1rem 1.15rem;
  min-height: 11rem;
}

.part-detail h3 {
  margin: 0 0 0.15rem;
  font-size: 1.14rem;
}

.part-detail .part-value {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--bronze);
  margin: 0 0 0.6rem;
  word-break: break-all;
}

.part-detail p:last-child {
  margin-bottom: 0;
}

/* The labelled callouts inside the anatomy drawing. */
.anatomy-figure .lbl {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  fill: var(--ink-3);
}

.anatomy-figure .lbl-on {
  fill: var(--bronze);
}

.anatomy-figure .leader {
  stroke: var(--rule-strong);
  stroke-width: 1;
  fill: none;
}

.anatomy-figure .leader-on {
  stroke: var(--bronze);
}

/* ------------------------------------------------------- passage of blocks */

.passage {
  display: grid;
  gap: clamp(1rem, 3vw, 2rem);
  grid-template-columns: 1fr;
  align-items: start;
}

@media (min-width: 54rem) {
  .passage {
    grid-template-columns: minmax(0, 1fr) minmax(15rem, 21rem);
  }
}

.step-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0 0 1.2rem;
}

.readout {
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
  margin: 0 0 1.1rem;
}

.readout > div {
  background: var(--surface);
  padding: 0.8rem 0.9rem;
}

.readout dt {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 0.25rem;
}

.readout dd {
  margin: 0;
  font-family: var(--mono);
  font-size: 1.14rem;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.readout dd small {
  display: block;
  font-size: 0.72rem;
  font-family: var(--sans);
  color: var(--ink-3);
  letter-spacing: 0;
}

/* The strata column: one hairline per block, thickening as the stretch grows. */
.strata-column {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--plate);
  padding: 0.9rem;
}

.strata-column svg {
  display: block;
  width: 100%;
  height: auto;
}

.strata-column figcaption {
  font-size: 0.78rem;
  color: var(--ink-3);
  margin-top: 0.6rem;
}

/* ------------------------------------------------------ move versus remain */

.fork {
  display: grid;
  gap: 1px;
  grid-template-columns: 1fr;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
}

@media (min-width: 48rem) {
  .fork {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.fork-side {
  background: var(--surface);
  padding: clamp(1rem, 2.6vw, 1.5rem);
}

.fork-side h3 {
  margin: 0 0 0.15rem;
}

.fork-side .verdict {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin: 0 0 0.9rem;
}

.fork-side[data-outcome="remain"] .verdict {
  color: var(--verdigris);
}

.fork-side[data-outcome="move"] .verdict {
  color: var(--umber);
}

.fork-side svg {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: 0.9rem;
}

.fork-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}

.fork-facts li {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  margin: 0;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--rule);
  font-size: 0.9rem;
}

.fork-facts .k {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--ink-3);
  flex: 0 0 6.5rem;
}

.fork-facts .v {
  color: var(--ink);
}

.fork-facts .v.kept {
  color: var(--verdigris);
}

.fork-facts .v.gone {
  color: var(--umber);
}

/* --------------------------------------------------------- mint wizard */

.wizard {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
}

.wizard-track {
  display: flex;
  overflow-x: auto;
  border-bottom: 1px solid var(--rule);
  background: var(--surface-2);
  scrollbar-width: thin;
}

.wizard-track button {
  font: inherit;
  font-size: 0.82rem;
  flex: 1 0 auto;
  min-width: 7.5rem;
  min-height: 3.2rem;
  padding: 0.55rem 0.8rem;
  background: transparent;
  border: 0;
  border-bottom: 3px solid transparent;
  border-right: 1px solid var(--rule);
  color: var(--ink-3);
  cursor: pointer;
  text-align: left;
  display: grid;
  gap: 0.1rem;
}

.wizard-track button:last-child {
  border-right: 0;
}

.wizard-track button .n {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
}

.wizard-track button .s {
  color: var(--ink-2);
}

.wizard-track button:hover .s {
  color: var(--ink);
}

.wizard-track button[aria-selected="true"] {
  border-bottom-color: var(--bronze);
  background: var(--surface);
}

.wizard-track button[aria-selected="true"] .s {
  color: var(--ink);
  font-weight: 600;
}

.wizard-panel {
  padding: clamp(1.1rem, 3vw, 1.8rem);
}

.wizard-panel h3 {
  margin-top: 0;
}

.wizard-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
  margin: 1.1rem 0 0;
}

@media (min-width: 46rem) {
  .wizard-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.wizard-fact {
  border-top: 2px solid var(--rule-strong);
  padding-top: 0.6rem;
}

.wizard-fact h4 {
  margin: 0 0 0.25rem;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.wizard-fact p {
  margin: 0;
  font-size: 0.91rem;
  color: var(--ink-2);
}

.wizard-fact[data-kind="risk"] {
  border-top-color: var(--umber);
}

.wizard-fact[data-kind="cost"] {
  border-top-color: var(--bronze);
}

.wizard-fact[data-kind="check"] {
  border-top-color: var(--verdigris);
}

.wizard-nav {
  display: flex;
  justify-content: space-between;
  gap: 0.6rem;
  border-top: 1px solid var(--rule);
  padding: 0.8rem clamp(1.1rem, 3vw, 1.8rem);
  background: var(--surface-2);
}

/* ---------------------------------------------------------- Firstlight seal */

/*
 * Firstlight has its own mark inside the same system: the cut section, with
 * the kerf opened so the first light reaches the core. Nothing else on the
 * site uses the double rim, so a Seal reads as a Seal at a glance.
 */
.seal-figure {
  margin: 0;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background:
    radial-gradient(90% 70% at 50% 6%, color-mix(in srgb, var(--bronze) 16%, transparent), transparent 62%),
    var(--plate);
  padding: clamp(1rem, 3vw, 1.8rem);
  display: grid;
  justify-items: center;
  gap: 0.9rem;
}

.seal-figure svg {
  display: block;
  width: 100%;
  max-width: 19rem;
  height: auto;
}

.seal-figure figcaption {
  font-size: 0.82rem;
  color: var(--ink-3);
  text-align: center;
  max-width: 34ch;
}

.seal-figure .seal-ray {
  fill: var(--bronze);
  fill-opacity: 0.16;
}

.seal-figure .seal-rim {
  fill: none;
  stroke: var(--bronze);
  stroke-width: 1.4;
}

.seal-figure .seal-rim-inner {
  fill: none;
  stroke: var(--bronze-deep);
  stroke-width: 0.9;
}

.seal-figure .seal-legend {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.22em;
  fill: var(--ink-3);
}

/* --------------------------------------------------------- fee estimator */

.fee-form {
  display: grid;
  gap: 0.9rem;
  margin: 0;
}

.fee-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: flex-end;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.field label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
}

input[type="number"],
input[type="text"],
input[type="date"],
input[type="url"],
input[type="search"],
select {
  font: inherit;
  /* 16px keeps a phone from zooming the whole page when the field is focused. */
  font-size: 1rem;
  min-height: 2.85rem;
  padding: 0.45rem 0.6rem;
  color: var(--ink);
  background: var(--surface-2);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  max-width: 100%;
}

.fee-error {
  margin: 0;
  font-size: 0.85rem;
  color: var(--alert);
}

/* ------------------------------------------------------------ ring history */

.chronicle {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.chronicle::before {
  content: "";
  position: absolute;
  left: 0.72rem;
  top: 0.6rem;
  bottom: 0.6rem;
  width: 1px;
  background: var(--rule-strong);
}

.chronicle > li {
  position: relative;
  margin: 0;
  padding: 0 0 1.4rem 2.4rem;
}

.chronicle > li::before {
  content: "";
  position: absolute;
  left: 0.35rem;
  top: 0.45rem;
  width: 0.78rem;
  height: 0.78rem;
  border-radius: 50%;
  background: var(--surface);
  border: 2px solid var(--tier-ink, var(--bronze));
}

.chronicle > li[data-live="true"]::before {
  background: var(--tier-ink, var(--bronze));
}

.chronicle .when {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--ink-3);
  display: block;
}

.chronicle .what {
  font-family: var(--serif);
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--ink);
  display: block;
  margin: 0.1rem 0 0.15rem;
}

.chronicle p {
  margin: 0;
  font-size: 0.89rem;
  color: var(--ink-2);
}

.chronicle .band-bar {
  display: block;
  height: 5px;
  margin-top: 0.5rem;
  border-radius: 999px;
  background: var(--tier-ink, var(--bronze));
  opacity: 0.75;
}

/* ------------------------------------------------------------------ tables */

.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  margin: 0 0 1.4rem;
}

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.89rem;
  background: var(--surface);
  min-width: 32rem;
}

caption {
  text-align: left;
  font-size: 0.82rem;
  color: var(--ink-3);
  padding: 0.6rem 0.85rem;
  border-bottom: 1px solid var(--rule);
  background: var(--surface-2);
}

th, td {
  text-align: left;
  padding: 0.55rem 0.85rem;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}

thead th {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  background: var(--surface-2);
  white-space: nowrap;
}

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

td.num,
th.num {
  text-align: right;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

td.mono {
  font-family: var(--mono);
  font-size: 0.84rem;
}

.byte-table td:first-child,
.byte-table td:nth-child(2) {
  font-family: var(--mono);
  color: var(--ink-2);
  white-space: nowrap;
}

/* -------------------------------------------------------------- code blocks */

.code {
  position: relative;
  border: 1px solid var(--code-rule);
  border-left: 3px solid var(--code-accent);
  border-radius: var(--radius);
  background: var(--code-bg);
  margin: 0 0 1.4rem;
}

.code-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.4rem 0.45rem 0.4rem 0.85rem;
  border-bottom: 1px solid var(--code-rule);
  background: color-mix(in srgb, var(--code-ink) 7%, var(--code-bg));
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--code-ink) 72%, transparent);
}

.code pre {
  margin: 0;
  padding: 0.9rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.83rem;
  line-height: 1.62;
  color: var(--code-ink);
  tab-size: 2;
}

.code pre .cmt {
  color: color-mix(in srgb, var(--code-ink) 60%, transparent);
}

.copy-ok {
  color: var(--verdigris);
}

/* ---------------------------------------------------------------- diagrams */

.diagram-scroll {
  overflow-x: auto;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--plate);
  padding: 1rem;
  margin: 0 0 0.8rem;
}

.diagram {
  display: block;
  width: 100%;
  min-width: 34rem;
  height: auto;
}

.diagram text {
  font-family: var(--sans);
  font-size: 13px;
  fill: var(--ink);
}

.diagram .d-title {
  font-family: var(--serif);
  font-size: 15px;
  font-weight: 600;
}

.diagram .d-mono {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.09em;
  fill: var(--ink-3);
}

.diagram .d-soft {
  fill: var(--ink-2);
  font-size: 12px;
}

.diagram .d-box {
  fill: var(--surface);
  stroke: var(--rule-strong);
  stroke-width: 1;
}

.diagram .d-line {
  stroke: var(--rule-strong);
  stroke-width: 1;
  fill: none;
}

.diagram .d-accent {
  stroke: var(--verdigris);
  stroke-width: 1.6;
  fill: none;
}

.diagram .d-bronze {
  stroke: var(--bronze);
  stroke-width: 1.6;
  fill: none;
}

figure.figure {
  margin: 0 0 1.6rem;
}

figure.figure figcaption {
  font-size: 0.83rem;
  color: var(--ink-3);
  max-width: var(--measure);
  margin-top: 0.5rem;
}

/* ----------------------------------------------------------------- callouts */

.note {
  border: 1px solid var(--rule);
  border-left: 3px solid var(--verdigris);
  background: var(--surface);
  padding: 0.95rem 1.15rem;
  border-radius: var(--radius);
  margin: 0 0 1.4rem;
}

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

.note h3,
.note h4 {
  margin-top: 0;
}

.note-warn {
  border-left-color: var(--umber);
}

.note-hard {
  border-left-color: var(--alert);
}

.note-title {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 0.45rem;
}

.note .note-title {
  color: var(--verdigris);
}

.note-warn .note-title {
  color: var(--umber);
}

.note-hard .note-title {
  color: var(--alert);
}

/* --------------------------------------------------------------- key facts */

.kv {
  margin: 0;
  border-top: 1px solid var(--rule);
}

.kv > div {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.1rem 1.1rem;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--rule);
}

@media (min-width: 40rem) {
  .kv > div {
    grid-template-columns: 14rem 1fr;
  }
}

.kv dt {
  font-weight: 600;
  color: var(--ink);
}

.kv dd {
  margin: 0;
  color: var(--ink-2);
}

/* -------------------------------------------------------------- link lists */

.link-list {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px solid var(--rule);
}

.link-list li {
  border-bottom: 1px solid var(--rule);
  margin: 0;
}

.link-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0.2rem 0.9rem 0;
  text-decoration: none;
  color: var(--ink);
}

.link-list a:hover {
  color: var(--ink);
  background: color-mix(in srgb, var(--surface) 70%, transparent);
}

.link-list a:hover .link-title {
  text-decoration: underline;
  text-decoration-color: var(--bronze);
}

.link-title {
  font-family: var(--serif);
  font-size: 1.06rem;
  font-weight: 600;
  color: var(--bronze);
}

.link-desc {
  display: block;
  font-size: 0.86rem;
  color: var(--ink-2);
  font-family: var(--sans);
}

.link-list .chev {
  color: var(--ink-3);
  font-family: var(--mono);
  flex: 0 0 auto;
}

/* Route cards: the doorways between discovery and the documentation. */
.routes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
  grid-template-columns: repeat(auto-fit, minmax(15.5rem, 1fr));
}

.routes li {
  margin: 0;
}

.routes a {
  display: block;
  height: 100%;
  padding: 1rem 1.1rem;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-top: 2px solid var(--rule-strong);
  border-radius: var(--radius);
  text-decoration: none;
}

.routes a:hover {
  border-top-color: var(--bronze);
}

.routes .r-who {
  display: block;
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 0.35rem;
}

.routes .r-title {
  display: block;
  font-family: var(--serif);
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--bronze);
  margin-bottom: 0.15rem;
}

.routes .r-desc {
  display: block;
  font-size: 0.87rem;
  color: var(--ink-2);
}

/* ----------------------------------------------------------------- details */

details.qa {
  border-bottom: 1px solid var(--rule);
}

details.qa > summary {
  cursor: pointer;
  padding: 0.95rem 0.2rem;
  font-family: var(--serif);
  font-size: 1.06rem;
  font-weight: 600;
  list-style-position: outside;
  min-height: 2.85rem;
}

details.qa > summary::marker {
  color: var(--bronze);
}

details.qa .qa-body {
  padding: 0 0 1.1rem 0.2rem;
  max-width: var(--measure);
}

details.qa .qa-body > :last-child {
  margin-bottom: 0;
}

/* --------------------------------------------------------------- press bits */

.asset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  padding: 1.1rem;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--surface);
  margin-bottom: 1rem;
}

.asset-preview {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  min-width: 8rem;
  min-height: 4.5rem;
  padding: 0.75rem;
  background: var(--bg-deep);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

.asset-preview img {
  display: block;
  max-height: 3.5rem;
  width: auto;
}

.asset-meta {
  flex: 1 1 14rem;
  min-width: 0;
}

.asset-meta h3 {
  margin: 0 0 0.25rem;
  font-size: 1.05rem;
}

.asset-meta p {
  margin: 0 0 0.5rem;
  font-size: 0.87rem;
  color: var(--ink-2);
}

.swatch-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 0 0 1.2rem;
}

.swatch-row li {
  margin: 0;
  flex: 1 1 7rem;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
}

.swatch-row .chipfill {
  display: block;
  height: 2.6rem;
  background: var(--tier-ink, var(--bronze));
}

.swatch-row .chipname {
  display: block;
  padding: 0.4rem 0.55rem 0.5rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-2);
}

/* ------------------------------------------------------------------ footer */

.site-footer {
  border-top: 1px solid var(--rule);
  background: var(--bg-deep);
  padding: 2.6rem 0 3rem;
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  gap: 1.8rem;
  grid-template-columns: 1fr;
}

@media (min-width: 46rem) {
  .footer-grid {
    grid-template-columns: minmax(0, 1.5fr) repeat(3, minmax(0, 1fr));
  }
}

.site-footer h2 {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 0.75rem;
}

.site-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-footer li {
  margin-bottom: 0.35rem;
}

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

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

.footer-note {
  margin: 2rem 0 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  color: var(--ink-3);
  font-size: 0.81rem;
  max-width: 62ch;
}

/* ----------------------------------------------------------- motion policy */

@media (prefers-reduced-motion: no-preference) {
  .specimen-cut .fill-disc,
  .specimen-cut .fill-edge,
  .progress-rail > span {
    transition: r 400ms cubic-bezier(0.22, 0.61, 0.36, 1),
                width 400ms cubic-bezier(0.22, 0.61, 0.36, 1);
  }

  .btn,
  .part-btn,
  .routes a,
  .link-list a {
    transition: border-color 140ms ease, color 140ms ease, background-color 140ms ease;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* --------------------------------------------------------- forced colours */

/*
 * Windows high contrast and similar modes replace the palette wholesale. What
 * breaks there is anything that carried meaning in a colour alone, so those
 * pieces get a border the system is obliged to keep drawing.
 */
@media (forced-colors: active) {
  .btn,
  .part-btn,
  .pill,
  .chip,
  .ring-chip-face,
  .plate,
  .specimen,
  .stat-grid,
  .readout,
  .ladder,
  .fork,
  .wizard {
    border: 1px solid CanvasText;
  }

  .btn-primary,
  .part-btn[aria-pressed="true"],
  .wizard-track button[aria-selected="true"] {
    border-width: 2px;
  }

  .site-nav a[aria-current="page"] {
    border-bottom-color: LinkText;
  }

  .progress-rail > span,
  .chronicle .band-bar {
    background: Highlight;
  }

  :focus-visible {
    outline: 2px solid Highlight;
  }
}

/* ------------------------------------------------------------------- print */

@media print {
  .site-header,
  .site-footer,
  .header-tools,
  .actions,
  .step-row,
  .wizard-nav,
  .skip {
    display: none;
  }

  body {
    background: #ffffff;
    color: #000000;
  }

  body::before {
    display: none;
  }

  .plate,
  .specimen,
  .note {
    border-color: #999999;
  }
}