@font-face { font-family: 'Expletus Sans'; font-style: italic; font-weight: 400; font-display: swap; src: url("/assets/fonts/expletus-sans-latin-400-italic.woff2") format("woff2"); }
@font-face { font-family: 'Expletus Sans'; font-style: normal; font-weight: 400; font-display: swap; src: url("/assets/fonts/expletus-sans-latin-400-normal.woff2") format("woff2"); }
@font-face { font-family: 'Expletus Sans'; font-style: italic; font-weight: 500; font-display: swap; src: url("/assets/fonts/expletus-sans-latin-500-italic.woff2") format("woff2"); }
@font-face { font-family: 'Expletus Sans'; font-style: normal; font-weight: 500; font-display: swap; src: url("/assets/fonts/expletus-sans-latin-500-normal.woff2") format("woff2"); }
@font-face { font-family: 'Expletus Sans'; font-style: italic; font-weight: 600; font-display: swap; src: url("/assets/fonts/expletus-sans-latin-600-italic.woff2") format("woff2"); }
@font-face { font-family: 'Expletus Sans'; font-style: normal; font-weight: 600; font-display: swap; src: url("/assets/fonts/expletus-sans-latin-600-normal.woff2") format("woff2"); }
@font-face { font-family: 'Expletus Sans'; font-style: italic; font-weight: 700; font-display: swap; src: url("/assets/fonts/expletus-sans-latin-700-italic.woff2") format("woff2"); }
@font-face { font-family: 'Expletus Sans'; font-style: normal; font-weight: 700; font-display: swap; src: url("/assets/fonts/expletus-sans-latin-700-normal.woff2") format("woff2"); }
@font-face { font-family: 'Barlow'; font-style: italic; font-weight: 100; font-display: swap; src: url("/assets/fonts/barlow-latin-100-italic.woff2") format("woff2"); }
@font-face { font-family: 'Barlow'; font-style: normal; font-weight: 100; font-display: swap; src: url("/assets/fonts/barlow-latin-100-normal.woff2") format("woff2"); }
@font-face { font-family: 'Barlow'; font-style: italic; font-weight: 200; font-display: swap; src: url("/assets/fonts/barlow-latin-200-italic.woff2") format("woff2"); }
@font-face { font-family: 'Barlow'; font-style: normal; font-weight: 200; font-display: swap; src: url("/assets/fonts/barlow-latin-200-normal.woff2") format("woff2"); }
@font-face { font-family: 'Barlow'; font-style: italic; font-weight: 300; font-display: swap; src: url("/assets/fonts/barlow-latin-300-italic.woff2") format("woff2"); }
@font-face { font-family: 'Barlow'; font-style: normal; font-weight: 300; font-display: swap; src: url("/assets/fonts/barlow-latin-300-normal.woff2") format("woff2"); }
@font-face { font-family: 'Barlow'; font-style: italic; font-weight: 400; font-display: swap; src: url("/assets/fonts/barlow-latin-400-italic.woff2") format("woff2"); }
@font-face { font-family: 'Barlow'; font-style: normal; font-weight: 400; font-display: swap; src: url("/assets/fonts/barlow-latin-400-normal.woff2") format("woff2"); }
@font-face { font-family: 'Barlow'; font-style: italic; font-weight: 500; font-display: swap; src: url("/assets/fonts/barlow-latin-500-italic.woff2") format("woff2"); }
@font-face { font-family: 'Barlow'; font-style: normal; font-weight: 500; font-display: swap; src: url("/assets/fonts/barlow-latin-500-normal.woff2") format("woff2"); }
@font-face { font-family: 'Barlow'; font-style: italic; font-weight: 600; font-display: swap; src: url("/assets/fonts/barlow-latin-600-italic.woff2") format("woff2"); }
@font-face { font-family: 'Barlow'; font-style: normal; font-weight: 600; font-display: swap; src: url("/assets/fonts/barlow-latin-600-normal.woff2") format("woff2"); }
@font-face { font-family: 'Barlow'; font-style: italic; font-weight: 700; font-display: swap; src: url("/assets/fonts/barlow-latin-700-italic.woff2") format("woff2"); }
@font-face { font-family: 'Barlow'; font-style: normal; font-weight: 700; font-display: swap; src: url("/assets/fonts/barlow-latin-700-normal.woff2") format("woff2"); }
@font-face { font-family: 'Barlow'; font-style: italic; font-weight: 800; font-display: swap; src: url("/assets/fonts/barlow-latin-800-italic.woff2") format("woff2"); }
@font-face { font-family: 'Barlow'; font-style: normal; font-weight: 800; font-display: swap; src: url("/assets/fonts/barlow-latin-800-normal.woff2") format("woff2"); }
@font-face { font-family: 'Barlow'; font-style: italic; font-weight: 900; font-display: swap; src: url("/assets/fonts/barlow-latin-900-italic.woff2") format("woff2"); }
@font-face { font-family: 'Barlow'; font-style: normal; font-weight: 900; font-display: swap; src: url("/assets/fonts/barlow-latin-900-normal.woff2") format("woff2"); }
:root {
  --bg-light-base: #f2f1f6;
  --fg-light-base-body: #1d1a2b;
  --fg-light-base-heading: #1d1a2b;
  --fg-light-base-muted: #534e6e;
  --fg-light-base-link: #7a2aa6;
  --fg-light-base-inverse: #1d1a2b;
  --bg-light-card: #ffffff;
  --fg-light-card-body: #1d1a2b;
  --fg-light-card-heading: #1d1a2b;
  --fg-light-card-muted: #534e6e;
  --fg-light-card-link: #7a2aa6;
  --fg-light-card-inverse: #1d1a2b;
  --bg-light-elevated: #e6e3f0;
  --fg-light-elevated-body: #1d1a2b;
  --fg-light-elevated-heading: #1d1a2b;
  --fg-light-elevated-muted: #534e6e;
  --fg-light-elevated-link: #5e1e82;
  --fg-light-elevated-inverse: #1d1a2b;
  --brand-light-accent: #7a2aa6;
  --brand-light-accent-hover: #5e1e82;
  --brand-light-on-accent: #ffffff;
  --focus-light-ring: #7a2aa6;
  --border-light-default: #7b7694;
  --border-light-subtle: #d3cfe0;
}
.bg-surface-base { background: var(--bg-light-base); --fg-body: var(--fg-light-base-body); --fg-heading: var(--fg-light-base-heading); --fg-muted: var(--fg-light-base-muted); --fg-link: var(--fg-light-base-link); --fg-inverse: var(--fg-light-base-inverse); }
.bg-surface-card { background: var(--bg-light-card); --fg-body: var(--fg-light-card-body); --fg-heading: var(--fg-light-card-heading); --fg-muted: var(--fg-light-card-muted); --fg-link: var(--fg-light-card-link); --fg-inverse: var(--fg-light-card-inverse); }
.bg-surface-elevated { background: var(--bg-light-elevated); --fg-body: var(--fg-light-elevated-body); --fg-heading: var(--fg-light-elevated-heading); --fg-muted: var(--fg-light-elevated-muted); --fg-link: var(--fg-light-elevated-link); --fg-inverse: var(--fg-light-elevated-inverse); }
.text-role-body { color: var(--fg-body); overflow-wrap: anywhere; }
.text-role-heading { color: var(--fg-heading); overflow-wrap: anywhere; }
.text-role-muted { color: var(--fg-muted); }
.text-role-link { color: var(--fg-link); }
.text-role-inverse { color: var(--fg-inverse); }
.text-role-link { text-decoration: underline; }
.text-role-link:hover { color: var(--brand-light-accent-hover); }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 2px solid var(--focus-light-ring); outline-offset: 2px; }
img { max-width: 100%; height: auto; }
.site-logo { max-width: 100%; height: auto; }
.site-menu > summary { list-style: none; cursor: pointer; }
.site-menu > summary::-webkit-details-marker { display: none; }
:where(section[data-section][style]) { background-size: cover; background-position: center; padding: clamp(1.5rem, 4vw, 3rem); }
:where(section[data-section][style] > .bg-surface-card) { padding: clamp(1rem, 3vw, 2rem); }
:where(section[data-section][style] > .bg-surface-card > :first-child) { margin-top: 0; }
:where(section[data-section][style] > .bg-surface-card > :last-child) { margin-bottom: 0; }
.skip-link { position: absolute; left: -9999px; }
.skip-link:focus { position: static; padding: 0.25rem 0.5rem; outline: 2px solid var(--focus-light-ring); }

/* Glossary atlas: cool index paper, a side rail with thumb-index letters, violet letter tabs and term highlights. */

:root {
  --font-heading: 'Expletus Sans', 'Century Gothic', 'Trebuchet MS', sans-serif;
  --font-body: 'Barlow', 'Segoe UI', Arial, sans-serif;
  --accent: var(--brand-light-accent);
  --accent-deep: var(--brand-light-accent-hover);
  --on-accent: var(--brand-light-on-accent);
  --line: var(--border-light-default);
  --line-soft: var(--border-light-subtle);
  --paper: var(--bg-light-card);
  --page: var(--bg-light-base);
  --shelf: var(--bg-light-elevated);
  --highlight: color-mix(in srgb, var(--brand-light-accent) 16%, transparent);
  --gutter: clamp(1rem, 4vw, 2.75rem);
  --measure: 40rem;
  --rail: 16.5rem;
  --tab: 2.6rem;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.09rem;
  line-height: 1.62;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.005em;
  margin: 0;
}

p,
ul,
ol,
dl,
table {
  margin: 0 0 1em;
}

a.text-role-link {
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

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

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

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

/* ---------- Frame and rail ---------- */

.atlas-frame {
  min-height: 100vh;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid var(--line-soft);
}

.rail-top {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4rem;
  padding: 0.5rem var(--gutter);
}

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 1 12.5rem;
  min-width: 0;
  text-decoration: none;
}

.brand svg,
.brand .site-logo {
  display: block;
  width: 100%;
  height: auto;
}

.nav-toggle {
  flex: none;
}

.rail-body {
  display: none;
}

/* Mobile menu: renderer-owned details.site-menu. */
.site-menu > summary {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  min-height: 2.75rem;
  padding: 0.4rem 0.9rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  white-space: nowrap;
  list-style: none;
  cursor: pointer;
  border: 1px solid var(--line);
  border-radius: 0.3rem 0.9rem 0.9rem 0.3rem;
}

.site-menu > summary::-webkit-details-marker {
  display: none;
}

.menu-icon {
  display: inline-block;
  width: 1.1rem;
  height: 0.8rem;
  border-top: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  position: relative;
}

.menu-icon::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0.35rem;
  top: 50%;
  border-top: 2px solid currentColor;
  transform: translateY(-50%);
}

.site-menu[open] > summary {
  color: var(--on-accent);
  background: var(--accent);
  border-color: var(--accent);
}

.site-menu > ul,
.site-menu > nav,
.site-menu > div {
  position: absolute;
  left: max(1rem, var(--gutter));
  right: max(1rem, var(--gutter));
  top: calc(100% + 0.25rem);
  margin: 0;
  padding: 0.5rem 0 0.75rem;
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-radius: 0.3rem;
  box-shadow: 0 0.75rem 1.5rem rgb(29 26 43 / 0.12);
}

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

.site-menu ul ul {
  padding-left: 1rem;
}

.site-menu a {
  display: block;
  padding: 0.55rem 1rem;
  font-weight: 500;
  text-decoration: none;
  border-bottom: 1px solid var(--line-soft);
}

/* Desktop nav list: renderer-owned nav.site-nav. */
.site-nav > ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav li {
  margin: 0;
}

.site-nav a,
.site-nav-group > summary {
  display: block;
  padding: 0.5rem 0.75rem 0.5rem 1rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border-left: 3px solid transparent;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  border-left-color: var(--accent);
  background: var(--highlight);
}

.site-nav-group > summary {
  cursor: pointer;
}

.site-nav-group ul {
  list-style: none;
  margin: 0;
  padding: 0 0 0 0.75rem;
}

.rail-index-label {
  margin: 0 0 0.5rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.85rem;
}

.az {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0.2rem;
}

.az li {
  margin: 0;
}

.az-on,
.az-off {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 2rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: 0.2rem 0.6rem 0.6rem 0.2rem;
}

.az-on {
  text-decoration: none;
  background: var(--highlight);
}

.az-on:hover,
.az-on:focus-visible {
  color: var(--on-accent);
  background: var(--accent);
}

.az-off {
  font-weight: 500;
}

/* ---------- Page body ---------- */

.atlas-page {
  min-width: 0;
}

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

.prose h2 {
  font-size: clamp(1.3rem, 2.4vw, 1.6rem);
  margin: 2rem 0 0.7rem;
  padding-left: 0.85rem;
  border-left: 4px solid var(--accent);
}

.prose h3 {
  font-size: 1.15rem;
  margin: 1.5rem 0 0.5rem;
}

.prose > :first-child {
  margin-top: 0;
}

.prose ul,
.prose ol {
  padding-left: 1.35rem;
}

.prose li {
  margin-bottom: 0.4rem;
}

.prose strong {
  font-weight: 600;
  background: linear-gradient(transparent 58%, var(--highlight) 58%);
}

.prose blockquote {
  margin: 1.5rem 0;
  padding: 0.25rem 0 0.25rem 1rem;
  border-left: 2px solid var(--line);
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.97rem;
}

.prose th,
.prose td {
  text-align: left;
  padding: 0.5rem 0.6rem;
  border-bottom: 1px solid var(--line-soft);
}

.page-title,
.cover-title,
.grid-title,
.entry-title,
.legend-title,
.ref-title,
.errata-title,
.steps-title {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.015em;
  overflow-wrap: break-word;
  hyphens: manual;
}

.page-title h1,
.cover-title h1,
.grid-title h1,
.entry-title h1,
.legend-title h1,
.ref-title h1,
.errata-title h1,
.steps-title h1 {
  margin: 0;
  font: inherit;
  letter-spacing: inherit;
  overflow-wrap: inherit;
}

/* ---------- Home: atlas cover ---------- */

.cover {
  display: grid;
  gap: 2rem;
  padding: clamp(2rem, 6vw, 4.5rem) var(--gutter);
}

.cover-title {
  font-size: clamp(1.7rem, 3.4vw, 2.6rem);
  max-width: 20ch;
  margin: 0 0 1.4rem;
}

.cover-lines {
  max-width: 30rem;
  font-size: 1.12rem;
}

.cover-lines p,
.cover-lines li {
  margin: 0 0 0.7rem;
  padding-left: 1rem;
  border-left: 2px solid var(--line-soft);
}

.cover-lines ul,
.cover-lines ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

.term-index {
  position: relative;
  padding: 1.5rem 1.25rem 1.25rem calc(var(--tab) + 1.5rem);
  border: 1px solid var(--line-soft);
  border-radius: 0.25rem;
}

.term-index::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(var(--tab) + 0.5rem);
  border-left: 1px solid var(--line-soft);
}

.index-heading {
  font-size: 1.25rem;
  margin: 0 0 1.25rem;
}

.letter {
  position: relative;
  padding: 0.35rem 0 0.9rem;
}

.letter + .letter {
  border-top: 1px solid var(--line-soft);
  padding-top: 0.9rem;
}

.letter-tab {
  position: absolute;
  left: calc(-1 * (var(--tab) + 1rem));
  top: 0.75rem;
  width: var(--tab);
  height: var(--tab);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  color: var(--on-accent);
  background: var(--accent);
  border-radius: 0.2rem 0.85rem 0.85rem 0.2rem;
}

.letter + .letter .letter-tab {
  top: 1.2rem;
}

.entries {
  margin: 0;
}

.entry {
  padding: 0.35rem 0;
}

.entry-term {
  display: inline;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
  background: linear-gradient(transparent 55%, var(--highlight) 55%);
}

.entry-q {
  margin: 0.1rem 0 0;
  font-size: 1rem;
}

.volumes {
  padding: clamp(1.75rem, 4vw, 2.75rem) var(--gutter);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.volumes-heading {
  font-size: 1.2rem;
  margin: 0 0 1rem;
}

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

.volume-list a {
  display: inline-block;
  padding: 0.5rem 0.95rem 0.5rem 0.75rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  background: var(--paper);
  border-left: 4px solid var(--accent);
  border-radius: 0 0.6rem 0.6rem 0;
}

.volume-list a:hover,
.volume-list a:focus-visible {
  text-decoration: underline;
}

.cover-body {
  padding: clamp(2rem, 5vw, 3.5rem) var(--gutter) clamp(2.5rem, 6vw, 4.5rem);
}

/* ---------- Topic cluster: letter grid ---------- */

.letter-grid {
  padding: 0 0 clamp(2.5rem, 6vw, 4rem);
}

.grid-head {
  padding: clamp(2rem, 5vw, 3.5rem) var(--gutter) clamp(1.5rem, 4vw, 2.25rem);
  border-bottom: 4px solid var(--accent);
}

.grid-title {
  font-size: clamp(1.7rem, 3.6vw, 2.5rem);
  max-width: 24ch;
}

.grid-intro {
  padding: clamp(1.75rem, 4vw, 2.75rem) var(--gutter) 0;
}

.tiles {
  margin: clamp(1.5rem, 4vw, 2.5rem) var(--gutter) 0;
  padding: 1.5rem;
  border-radius: 0.25rem;
}

.tiles-heading {
  font-size: 1.2rem;
  margin: 0 0 1rem;
}

.tile-grid > ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
  gap: 0.75rem;
}

.tile-grid li {
  margin: 0;
}

.tile-grid a {
  display: flex;
  align-items: flex-start;
  height: 100%;
  min-height: 5.5rem;
  padding: 1rem 1rem 1rem 1.1rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
  line-height: 1.3;
  text-decoration: none;
  background: var(--paper);
  border-top: 3px solid var(--accent);
  border-radius: 0 0 0.5rem 0.5rem;
}

.tile-grid a:hover,
.tile-grid a:focus-visible {
  text-decoration: underline;
}

/* ---------- Question detail: term entry ---------- */

.term-entry {
  padding: 0 0 clamp(2.5rem, 6vw, 4rem);
}

.entry-head {
  padding: clamp(2rem, 5vw, 3.25rem) var(--gutter) clamp(1.5rem, 3.5vw, 2rem);
  border-bottom: 1px solid var(--line-soft);
}

.entry-title {
  font-size: clamp(1.55rem, 3.2vw, 2.2rem);
  max-width: 24ch;
  padding-left: 1rem;
  border-left: 6px solid var(--accent);
}

.entry-cols {
  display: grid;
  gap: 2rem;
  padding: clamp(1.75rem, 4vw, 2.75rem) var(--gutter) 0;
}

.entry-side {
  align-self: start;
  padding: 1.25rem;
  border-radius: 0.25rem;
}

.side-heading,
.key-heading,
.sources-heading {
  font-size: 1.1rem;
  margin: 0 0 0.75rem;
}

.side-list,
.key-list,
.source-list {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
}

.side-list li,
.key-list li,
.source-list li {
  margin: 0;
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--line-soft);
}

.side-note,
.sources-note {
  font-size: 0.95rem;
}

.side-back,
.steps-back {
  margin: 0;
  font-weight: 600;
}

/* ---------- Geo cluster: map legend ---------- */

.map-legend,
.ref-note {
  padding: clamp(2rem, 5vw, 3.5rem) var(--gutter) clamp(2.5rem, 6vw, 4rem);
}

.legend-title,
.ref-title {
  font-size: clamp(1.7rem, 3.6vw, 2.5rem);
  max-width: 24ch;
  margin: 0 0 clamp(1.5rem, 4vw, 2.25rem);
}

.legend-split,
.ref-split {
  display: grid;
  gap: 1.75rem;
}

.legend-towns {
  padding: clamp(1.25rem, 3vw, 2rem);
  border: 1px solid var(--line-soft);
  border-radius: 0.25rem;
}

.legend-key {
  align-self: start;
  padding: 1.25rem;
  border-radius: 0.25rem;
}

.key-list a {
  display: block;
  padding-left: 1.4rem;
  position: relative;
  font-weight: 500;
}

.key-list a::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.4em;
  width: 0.8rem;
  height: 0.8rem;
  background: var(--accent);
  border-radius: 0.1rem 0.4rem 0.4rem 0.1rem;
}

/* ---------- About: reference note ---------- */

.ref-sources {
  align-self: start;
  padding: 1.25rem;
  border: 1px solid var(--line-soft);
  border-top: 4px solid var(--accent);
  border-radius: 0 0 0.25rem 0.25rem;
}

/* ---------- Contact: errata slip ---------- */

.errata,
.index-steps {
  padding: clamp(2rem, 5vw, 3.5rem) var(--gutter) clamp(2.5rem, 6vw, 4rem);
}

.errata-slip,
.steps-card {
  max-width: 44rem;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border: 1px solid var(--line-soft);
  border-left: 6px solid var(--accent);
  border-radius: 0.25rem;
}

.errata-title,
.steps-title {
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
  margin: 0 0 1.25rem;
}

.slip-form {
  display: grid;
  gap: 1rem;
  margin-top: 1.75rem;
  padding-top: 1.5rem;
  border-top: 1px dashed var(--line);
}

.slip-row {
  display: grid;
  gap: 1rem;
}

.field {
  display: grid;
  gap: 0.3rem;
}

.field label {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
}

.field input {
  width: 100%;
  min-height: 2.9rem;
  padding: 0.55rem 0.75rem;
  font: inherit;
  color: inherit;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 0.25rem;
}

.field input:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}

.slip-button {
  justify-self: start;
  min-height: 2.9rem;
  padding: 0.6rem 1.4rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: var(--on-accent);
  background: var(--accent);
  border: 0;
  border-radius: 0.2rem 0.9rem 0.9rem 0.2rem;
  cursor: pointer;
}

.slip-button:hover,
.slip-button:focus-visible {
  background: var(--accent-deep);
}

/* ---------- Thank you: index steps ---------- */

.steps-heading {
  font-size: 1.2rem;
  margin: 1.75rem 0 1rem;
}

.steps {
  list-style: none;
  counter-reset: step;
  margin: 0 0 1.5rem;
  padding: 0;
}

.steps li {
  counter-increment: step;
  position: relative;
  margin: 0;
  padding: 0.6rem 0 0.6rem 3.25rem;
  min-height: 2.6rem;
}

.steps li + li {
  margin-left: 1.25rem;
}

.steps li + li + li {
  margin-left: 2.5rem;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0.35rem;
  width: 2.25rem;
  height: 2.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--on-accent);
  background: var(--accent);
  border-radius: 0.2rem 0.75rem 0.75rem 0.2rem;
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--line-soft);
}

.footer-inner {
  padding: 2rem var(--gutter) 2.5rem;
  max-width: 52rem;
}

.footer-strap {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  margin: 0 0 0.4rem;
}

.footer-note {
  margin: 0 0 1rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.25rem;
  margin: 0;
  font-size: 0.97rem;
}

/* ---------- Wider screens ---------- */

@media (min-width: 40rem) {
  .slip-row {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 56rem) {
  .cover {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: start;
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .cover-intro {
    position: sticky;
    top: 2rem;
  }

  .entry-cols {
    grid-template-columns: minmax(0, 1fr) 17rem;
    gap: clamp(2rem, 4vw, 3rem);
  }

  .entry-side {
    position: sticky;
    top: 2rem;
  }

  .legend-split {
    grid-template-columns: minmax(0, 1.6fr) minmax(15rem, 1fr);
  }

  .ref-split {
    grid-template-columns: minmax(0, 1.5fr) minmax(15rem, 1fr);
    gap: clamp(2rem, 4vw, 3rem);
  }
}

@media (min-width: 64rem) {
  html {
    scroll-padding-top: 1.5rem;
  }

  .atlas-frame {
    display: grid;
    grid-template-columns: var(--rail) minmax(0, 1fr);
    grid-template-rows: 1fr auto;
  }

  .site-header {
    grid-column: 1;
    grid-row: 1 / span 2;
    align-self: start;
    height: 100vh;
    overflow-y: auto;
    border-bottom: 0;
    border-right: 1px solid var(--line-soft);
  }

  .rail-top {
    padding: 1.5rem 1.25rem 1.25rem;
  }

  .nav-toggle {
    display: none;
  }

  .rail-body {
    display: block;
    padding: 0 0 1.5rem;
  }

  .rail-nav {
    margin: 0 0 1.5rem;
    border-top: 1px solid var(--line-soft);
    padding-top: 0.75rem;
  }

  .rail-index {
    padding: 1rem 1.25rem 0;
    border-top: 1px solid var(--line-soft);
  }

  .atlas-page {
    grid-column: 2;
    grid-row: 1;
  }

  .site-footer {
    grid-column: 2;
    grid-row: 2;
  }
}

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