/* MarsDNM — values mirror DESIGN.md */

@font-face {
  font-family: "Hanken Grotesk";
  src: url("/assets/fonts/hanken-grotesk-latin-wght-normal.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "Source Serif 4";
  src: url("/assets/fonts/source-serif-4-latin-wght-normal.woff2") format("woff2");
  font-weight: 200 900;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  --bg: oklch(0.993 0.004 300);
  --surface: oklch(0.957 0.02 300);
  --text: oklch(0.25 0.035 300);
  --text-muted: oklch(0.47 0.035 300);
  --border: oklch(0.86 0.025 300);
  --link: oklch(0.44 0.16 298);
  --link-hover: oklch(0.33 0.14 298);
  --petrol: oklch(0.40 0.14 300);
  --petrol-deep: oklch(0.28 0.09 300);
  --on-petrol: #ffffff;
  --on-petrol-muted: oklch(0.88 0.05 300);
  --on-deep-muted: oklch(0.86 0.04 300);
  --saffron: oklch(0.84 0.15 82);
  --warn: oklch(0.55 0.18 33);
  --warn-tint: oklch(0.962 0.022 45);

  --font-sans: "Hanken Grotesk", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Source Serif 4", Charter, "Bitstream Charter", Georgia, "Times New Roman", serif;
  --font-mono: ui-monospace, "Cascadia Mono", "SF Mono", Menlo, Consolas, "DejaVu Sans Mono", monospace;

  --step--1: 0.875rem;
  --step-0: clamp(1.0625rem, 1rem + 0.25vw, 1.1875rem);
  --step-1: clamp(1.1875rem, 1.1rem + 0.4vw, 1.375rem);
  --step-2: clamp(1.4375rem, 1.2rem + 1vw, 1.875rem);
  --step-3: clamp(1.875rem, 1.4rem + 2vw, 2.75rem);
  --step-4: clamp(2.25rem, 1.5rem + 3.2vw, 3.75rem);

  --measure: 68ch;
  --container: 74rem;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  --toc-width: 16rem;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;

  color-scheme: light;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: var(--space-5);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-serif);
  font-size: var(--step-0);
  line-height: 1.62;
}

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

/* Links and focus */

a {
  color: var(--link);
  text-decoration-line: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  text-decoration-color: color-mix(in oklch, var(--link) 55%, transparent);
}

a:hover {
  color: var(--link-hover);
  text-decoration-thickness: 2px;
  text-decoration-color: currentColor;
}

a:active {
  color: var(--text);
}

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

.masthead :focus-visible,
.site-footer :focus-visible,
article aside:has(> h2) :focus-visible {
  outline-color: var(--saffron);
}

.skip-link {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  z-index: 10;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: var(--space-2) var(--space-4);
  background: var(--saffron);
  color: var(--petrol-deep);
  font: 700 1rem/1.2 var(--font-sans);
  text-decoration: none;
  transform: translateY(-300%);
}

.skip-link:focus {
  transform: none;
  outline: 3px solid var(--petrol-deep);
  outline-offset: 2px;
}

/* Back to top — CSS scroll-driven (no JS); hidden where unsupported */

.back-to-top {
  display: none;
}

@supports (animation-timeline: scroll()) {
  @keyframes back-to-top-reveal {
    0%,
    10% {
      opacity: 0;
      visibility: hidden;
      pointer-events: none;
    }

    11%,
    100% {
      opacity: 1;
      visibility: visible;
      pointer-events: auto;
    }
  }

  .back-to-top {
    position: fixed;
    right: max(var(--gutter), env(safe-area-inset-right, 0px));
    bottom: max(var(--space-5), env(safe-area-inset-bottom, 0px));
    z-index: 9;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-1);
    min-width: 48px;
    min-height: 48px;
    padding-inline: var(--space-3);
    border-radius: 999px;
    border: 1px solid color-mix(in oklch, var(--petrol) 28%, var(--border));
    background: var(--surface);
    color: var(--petrol);
    font: 650 0.8125rem/1.15 var(--font-sans);
    letter-spacing: 0.02em;
    text-decoration: none;
    text-decoration-line: none;
    box-shadow: 0 4px 20px color-mix(in oklch, var(--text) 14%, transparent);
    animation-name: back-to-top-reveal;
    animation-timing-function: linear;
    animation-timeline: scroll(root);
    animation-range: 0% 100%;
    transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
  }

  .back-to-top::before {
    content: "↑";
    font-size: 1.1em;
    line-height: 1;
  }

  .back-to-top:hover {
    color: var(--link-hover);
    border-color: color-mix(in oklch, var(--link) 40%, var(--border));
    background: color-mix(in oklch, var(--surface) 92%, var(--petrol));
    box-shadow: 0 6px 24px color-mix(in oklch, var(--text) 18%, transparent);
  }

  .back-to-top:active {
    color: var(--text);
  }

  .back-to-top:focus-visible {
    outline: 3px solid var(--saffron);
    outline-offset: 3px;
  }

  @media (prefers-reduced-motion: reduce) {
    .back-to-top {
      animation: none;
      opacity: 1;
      visibility: visible;
      pointer-events: auto;
    }
  }
}

/* Masthead */

.masthead {
  background: var(--petrol);
  color: var(--on-petrol);
  font-family: var(--font-sans);
}

.masthead-brand {
  padding-block: var(--space-2) var(--space-2);
}

.brand {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0 var(--space-4);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--on-petrol);
  font: 800 1.75rem/1 var(--font-sans);
  letter-spacing: -0.035em;
  text-decoration: none;
}

.wordmark-text > span {
  margin-left: 0.08em;
  padding: 0.12em 0.18em 0.1em;
  background: var(--saffron);
  color: var(--petrol-deep);
  letter-spacing: -0.01em;
}

.wordmark:hover {
  color: var(--on-petrol);
}

.brand-note {
  color: var(--on-petrol-muted);
  font-size: var(--step--1);
  font-weight: 500;
  line-height: 1.35;
}

.masthead-nav {
  background: var(--petrol-deep);
}

nav[aria-label="Primary"] {
  display: flex;
  flex-wrap: wrap;
  margin-inline: calc(var(--space-2) * -1);
}

nav[aria-label="Primary"] a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: var(--space-1) var(--space-2);
  border-bottom: 4px solid transparent;
  color: var(--on-petrol);
  font: 650 0.9375rem/1.2 var(--font-sans);
  text-decoration: none;
}

nav[aria-label="Primary"] a:hover {
  border-bottom-color: var(--on-deep-muted);
}

nav[aria-label="Primary"] a[aria-current="page"] {
  border-bottom-color: var(--saffron);
}

nav[aria-label="Primary"] a:focus-visible {
  outline-offset: -3px;
}

@media (min-width: 40rem) {
  .brand-note {
    padding-left: var(--space-4);
    border-left: 1px solid color-mix(in oklch, var(--on-petrol) 30%, transparent);
  }

  nav[aria-label="Primary"] a {
    padding-inline: var(--space-3);
    min-height: 48px;
  }

  nav[aria-label="Primary"] {
    margin-inline: calc(var(--space-3) * -1);
  }
}

/* Page meta: breadcrumb and dateline */

.page-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0 var(--space-5);
  padding-block: var(--space-2) 0;
  color: var(--text-muted);
  font: 500 var(--step--1)/1.35 var(--font-sans);
}

nav[aria-label="Breadcrumb"] {
  min-width: 0;
  flex: 1 1 20rem;
}

nav[aria-label="Breadcrumb"] ol {
  display: flex;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
}

nav[aria-label="Breadcrumb"] li {
  display: flex;
  align-items: center;
  min-width: 0;
  white-space: nowrap;
}

nav[aria-label="Breadcrumb"] li + li::before {
  content: "/";
  margin-inline: var(--space-2);
  color: var(--text-muted);
}

nav[aria-label="Breadcrumb"] li[aria-current="page"] {
  overflow: hidden;
  text-overflow: ellipsis;
  display: block;
}

nav[aria-label="Breadcrumb"] a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-weight: 650;
}

.dateline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1) var(--space-2);
  margin: 0;
}

.dateline-label {
  padding: 0.3rem 0.5rem 0.25rem;
  background: var(--petrol);
  color: var(--on-petrol);
  font-size: 0.75rem;
  font-weight: 750;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.dateline:not(:has(time)) .dateline-label {
  display: none;
}

.dateline time {
  color: var(--text);
  font-weight: 700;
}

.byline a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-weight: 650;
}

/* Page grid and in-page navigation */

.page-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
  padding-top: var(--space-2);
  padding-bottom: var(--space-8);
}

.toc:not(:has(a)) {
  display: none;
}

.toc details {
  border: 2px solid var(--petrol);
  background: var(--bg);
  font-family: var(--font-sans);
}

.toc summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  min-height: 44px;
  padding: var(--space-1) var(--space-4);
  color: var(--petrol);
  font-size: 0.9375rem;
  font-weight: 750;
  cursor: pointer;
  list-style: none;
}

.toc summary::-webkit-details-marker {
  display: none;
}

.toc summary::after {
  content: "";
  flex: none;
  width: 0.55rem;
  height: 0.55rem;
  margin-top: -0.3rem;
  border-right: 2.5px solid currentColor;
  border-bottom: 2.5px solid currentColor;
  transform: rotate(45deg);
}

.toc details[open] summary::after {
  margin-top: 0.3rem;
  transform: rotate(-135deg);
}

.toc details:not([open]) > nav {
  display: none;
}

.toc summary:hover {
  background: var(--surface);
}

.toc ol {
  margin: 0;
  padding: 0 var(--space-4) var(--space-3);
  list-style: none;
}

.toc li {
  border-top: 1px solid var(--border);
}

.toc ol a {
  display: block;
  min-height: 44px;
  padding: 0.625rem 0;
  color: var(--text);
  font-size: 0.9375rem;
  font-weight: 550;
  line-height: 1.35;
  text-decoration: none;
}

.toc ol a:hover {
  color: var(--link-hover);
  text-decoration: underline;
  text-decoration-color: currentColor;
}

@media (min-width: 60rem) {
  .page-grid {
    grid-template-columns: minmax(0, 1fr) var(--toc-width);
    column-gap: clamp(2rem, 4vw, 4rem);
    align-items: start;
  }

  .page-grid > article {
    grid-column: 1;
    grid-row: 1;
  }

  .page-grid > .toc {
    grid-column: 2;
    grid-row: 1;
    position: sticky;
    top: var(--space-5);
    max-height: calc(100vh - 3rem);
    overflow-y: auto;
    margin-top: var(--space-2);
  }

  .toc details {
    border: 0;
    border-top: 5px solid var(--petrol);
  }

  .toc summary {
    padding-inline: 0;
    font-size: 0.8125rem;
    letter-spacing: 0.07em;
    text-transform: uppercase;
  }

  .toc ol {
    padding-inline: 0;
  }

  @supports selector(::details-content) {
    .toc details::details-content {
      display: block;
      content-visibility: visible;
    }

    .toc details:not([open]) > nav {
      display: block;
    }

    .toc summary {
      display: none;
    }

    .toc nav::before {
      content: "In this guide";
      content: "In this guide" / "";
      display: flex;
      align-items: center;
      min-height: 48px;
      color: var(--petrol);
      font-size: 0.8125rem;
      font-weight: 750;
      letter-spacing: 0.07em;
      text-transform: uppercase;
    }

    .layout-hub .toc nav::before {
      content: "On this page";
      content: "On this page" / "";
    }
  }
}

/* Article */

article {
  min-width: 0;
  overflow-wrap: break-word;
}

article :is(p, ul, ol, h3) {
  max-width: var(--measure);
}

article h1 {
  margin: var(--space-2) 0 var(--space-5);
  font: 800 var(--step-3)/1.06 var(--font-sans);
  letter-spacing: -0.028em;
  text-wrap: balance;
}

article h2 {
  margin: 0 0 var(--space-4);
  padding-top: var(--space-4);
  border-top: 2px solid var(--text);
  font: 750 var(--step-2)/1.15 var(--font-sans);
  letter-spacing: -0.018em;
  text-wrap: balance;
}

article h3 {
  margin: var(--space-6) 0 var(--space-2);
  font: 700 1.25rem/1.3 var(--font-sans);
  letter-spacing: -0.01em;
}

article p {
  margin: 0 0 1.1em;
  text-wrap: pretty;
}

article > h1 + p,
article > p.mars-onion + p {
  font-size: var(--step-1);
  line-height: 1.5;
  font-weight: 450;
}

/* The verified onion address at the top of the link page */

article > p.mars-onion-label {
  margin: var(--space-2) 0;
  color: var(--text-muted);
  font: 750 0.8125rem/1.4 var(--font-sans);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

article > p.mars-onion {
  max-width: none;
  margin: 0 0 var(--space-5);
  color: var(--link);
  font: 800 clamp(1.25rem, 1.05rem + 1.1vw, 1.75rem)/1.25 var(--font-sans);
  letter-spacing: -0.01em;
  overflow-wrap: anywhere;
}

article section {
  margin-top: clamp(2.5rem, 2rem + 2vw, 3.5rem);
}

article strong {
  font-weight: 700;
}

/* Status line under the standfirst */

article > p:has(> time) {
  position: relative;
  padding: var(--space-3) var(--space-4) var(--space-3) 2.5rem;
  background: var(--surface);
  font: 600 0.9375rem/1.5 var(--font-sans);
}

article > p:has(> time)::before {
  content: "";
  position: absolute;
  top: 1.05rem;
  left: var(--space-4);
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: var(--petrol);
  box-shadow: 0 0 0 3px color-mix(in oklch, var(--petrol) 22%, transparent);
}

/* Lists */

article ul {
  margin: 0 0 var(--space-5);
  padding: 0;
  list-style: none;
}

article ul > li {
  position: relative;
  margin-bottom: var(--space-2);
  padding-left: 1.5rem;
}

article ul > li::before {
  content: "";
  position: absolute;
  top: 0.62em;
  left: 0.2rem;
  width: 0.45rem;
  height: 0.45rem;
  background: var(--petrol);
}

article ol {
  margin: 0 0 var(--space-5);
  padding: 0;
  list-style: none;
  counter-reset: step;
}

article ol > li {
  position: relative;
  min-height: 2.25rem;
  padding: 0 0 var(--space-4) 3rem;
  counter-increment: step;
}

article ol > li::before {
  content: counter(step);
  position: absolute;
  top: 0.1rem;
  left: 0;
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  background: var(--petrol);
  color: var(--on-petrol);
  font: 800 1rem/1 var(--font-sans);
}

article ol > li:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 2.35rem;
  bottom: 0.25rem;
  left: calc(1rem - 1px);
  width: 2px;
  background: color-mix(in oklch, var(--petrol) 35%, transparent);
}

/* Definition lists */

article dl {
  margin: var(--space-5) 0 var(--space-6);
  border-top: 2px solid var(--text);
}

article dt {
  padding-top: var(--space-4);
  font: 700 1.0625rem/1.35 var(--font-sans);
}

article dd {
  margin: var(--space-1) 0 0;
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border);
}

@media (min-width: 40rem) {
  article dl {
    display: grid;
    grid-template-columns: minmax(9rem, 14rem) minmax(0, 1fr);
    column-gap: var(--space-5);
  }

  article dt {
    grid-column: 1;
    padding: var(--space-4) 0;
    border-bottom: 1px solid var(--border);
  }

  article dd {
    grid-column: 2;
    margin: 0;
    padding: var(--space-4) 0;
  }
}

/* Code: fingerprints, commands, gpg output */

code {
  padding: 0.08em 0.32em;
  border-radius: 2px;
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: 0.86em;
  font-variant-ligatures: none;
  overflow-wrap: anywhere;
}

article dt code {
  padding: 0;
  background: none;
  font-size: 0.9em;
}

/* Tables */

article table {
  width: 100%;
  margin: var(--space-5) 0 var(--space-6);
  border-collapse: collapse;
  font: 400 0.9375rem/1.45 var(--font-sans);
  font-variant-numeric: lining-nums tabular-nums;
}

article caption {
  caption-side: top;
  padding: 0 0 var(--space-3);
  text-align: left;
  font-size: 1rem;
  font-weight: 750;
  line-height: 1.35;
}

article thead th {
  padding: 0.7rem 0.875rem;
  background: var(--petrol);
  color: var(--on-petrol);
  font-size: 0.875rem;
  font-weight: 700;
  text-align: left;
  vertical-align: bottom;
}

article tbody th {
  width: 26%;
  padding: 0.75rem 0.875rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  font-weight: 700;
  text-align: left;
  vertical-align: top;
}

article td {
  padding: 0.75rem 0.875rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

article tbody tr:last-child > * {
  border-bottom: 2px solid var(--petrol);
}

@media (max-width: 47.99rem) {
  article table {
    display: block;
    --cols: 2;
  }

  article table:has(thead th:nth-child(4)) {
    --cols: 3;
    font-size: 0.875rem;
  }

  article caption,
  article thead,
  article tbody {
    display: block;
  }

  article tr {
    display: grid;
    grid-template-columns: repeat(var(--cols), minmax(0, 1fr));
  }

  article thead th {
    padding: 0.6rem 0.75rem;
    font-size: 0.8125rem;
  }

  article thead th:first-child {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  article tbody th[scope="row"] {
    grid-column: 1 / -1;
    width: auto;
    padding: 0.625rem 0.75rem 0.5rem;
    border-bottom: 0;
  }

  article td {
    padding: 0.5rem 0.75rem 0.75rem;
    hyphens: auto;
    overflow-wrap: anywhere;
  }

  article td + td {
    border-left: 1px solid var(--border);
  }
}

/* Asides: the verdict box and caution notes */

article aside:has(> h2) {
  margin: var(--space-6) 0 0;
  padding: var(--space-5) clamp(1.25rem, 3vw, 2rem) var(--space-4);
  border-top: 6px solid var(--saffron);
  background: var(--petrol);
  color: var(--on-petrol);
}

article aside:has(> h2) h2 {
  margin-bottom: var(--space-3);
  padding-top: 0;
  border-top: 0;
  color: var(--on-petrol);
  font-size: var(--step-1);
}

article aside:has(> h2) ul {
  margin: 0;
}

article aside:has(> h2) ul > li {
  margin: 0;
  padding: var(--space-3) 0 var(--space-3) 1.75rem;
  border-top: 1px solid color-mix(in oklch, var(--on-petrol) 24%, transparent);
}

article aside:has(> h2) ul > li::before {
  top: calc(var(--space-3) + 0.55em);
  width: 0.6rem;
  height: 0.6rem;
  background: var(--saffron);
}

article aside:has(> h2) a {
  color: var(--on-petrol);
}

article aside[role="note"] {
  max-width: var(--measure);
  margin: var(--space-5) 0 var(--space-6);
  padding: var(--space-4) var(--space-5) var(--space-4);
  border-top: 5px solid var(--warn);
  background: var(--warn-tint);
}

article aside[role="note"] p {
  margin: 0;
}

article aside[role="note"] p + p {
  margin-top: 0.75em;
}

article aside[role="note"] strong {
  font-family: var(--font-sans);
  font-weight: 750;
}

/* Figures and inline diagrams */

article figure {
  margin: var(--space-6) 0;
  padding: clamp(1rem, 3vw, 1.5rem);
  border-top: 3px solid var(--petrol);
  background: var(--surface);
}

article figure svg {
  display: block;
  width: 100%;
  height: auto;
  color: var(--petrol);
  font-family: var(--font-sans);
}

article figure svg text {
  fill: var(--text);
}

article figure img {
  display: block;
  max-width: 100%;
  height: auto;
}

article figcaption {
  max-width: var(--measure);
  margin-top: var(--space-3);
  color: var(--text-muted);
  font: 500 0.875rem/1.45 var(--font-sans);
}

@media (max-width: 39.99rem) {
  article figure:has(> svg) {
    margin-inline: calc(var(--gutter) * -1);
    padding-inline: var(--space-2);
  }

  article figure svg text[font-size="12"] {
    font-size: 14.4px;
  }

  article figure svg text[font-size="13"] {
    font-size: 15.6px;
  }

  article figure svg text[font-size="14"] {
    font-size: 16.8px;
  }

  article figure svg text[font-size="15"] {
    font-size: 18px;
  }
}

/* Homepage */

.layout-hub article h1 {
  max-width: 20ch;
  font-size: var(--step-4);
  line-height: 1.02;
  letter-spacing: -0.035em;
}

/* Trust pages and 404 */

.layout-trust main > article,
.not-found {
  max-width: 44rem;
  padding-bottom: var(--space-8);
}

.layout-trust article h1 {
  padding-bottom: var(--space-4);
  border-bottom: 6px solid var(--petrol);
}

.layout-trust article ul > li::before {
  background: var(--saffron);
  outline: 1px solid var(--petrol);
}

.not-found {
  padding-top: var(--space-7);
}

.not-found h1 {
  margin: 0 0 var(--space-4);
  font: 800 var(--step-3)/1.06 var(--font-sans);
  letter-spacing: -0.028em;
}

.button-link {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: var(--space-3) var(--space-5);
  background: var(--petrol);
  color: var(--on-petrol);
  font: 700 1rem/1.2 var(--font-sans);
  text-decoration: none;
}

.button-link:hover {
  background: var(--petrol-deep);
  color: var(--on-petrol);
}

/* Footer */

.site-footer {
  padding: var(--space-7) 0 var(--space-6);
  border-top: 6px solid var(--saffron);
  background: var(--petrol-deep);
  color: var(--on-deep-muted);
  font-family: var(--font-sans);
}

.site-footer nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-6) var(--space-5);
}

.site-footer h2 {
  margin: 0 0 var(--space-2);
  color: var(--saffron);
  font-size: 0.8125rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

.site-footer ul a {
  display: flex;
  align-items: center;
  min-height: 44px;
  color: var(--on-petrol);
  font-size: 0.9375rem;
  text-decoration: none;
}

.site-footer ul a:hover {
  color: var(--on-petrol);
  text-decoration: underline;
  text-decoration-color: var(--saffron);
}

.colophon {
  margin: var(--space-6) 0 0;
  padding-top: var(--space-5);
  border-top: 1px solid color-mix(in oklch, var(--on-petrol) 18%, transparent);
  font-size: var(--step--1);
  line-height: 1.5;
}

.wordmark-small {
  color: var(--on-petrol);
  font-weight: 800;
  letter-spacing: -0.02em;
}

@media (min-width: 48rem) {
  .site-footer nav {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* Motion: colour changes only, and only when motion is welcome */

@media (prefers-reduced-motion: no-preference) {
  a,
  nav[aria-label="Primary"] a,
  .toc summary {
    transition: color 120ms ease-out, background-color 120ms ease-out, border-color 120ms ease-out, text-decoration-color 120ms ease-out;
  }
}

@media print {
  .masthead-nav,
  .toc,
  .site-footer nav,
  .skip-link {
    display: none;
  }

  body {
    background: #fff;
  }
}