/* ==========================================================================
   Design tokens
   Colors are generated from _data/theme.yml. Typography, spacing, layout,
   and motion tokens are defined here.
   ========================================================================== */

:root {
  color-scheme: light;
  --color-bg: #F7F6F3;
  --color-surface: #FFFFFF;
  --color-surface-muted: #EFEDE8;
  --color-text: #16171B;
  --color-text-muted: #555A64;
  --color-border: #E0DDD6;
  --color-border-strong: #B3AEA3;
  --color-border-input: #8A857B;
  --color-accent: #B93C0B;
  --color-accent-hover: #9A3412;
  --color-accent-soft: #FCEEE6;
  --color-on-accent: #FFFFFF;
  --color-grid: rgb(22 23 27 / 5%);

  /* Typography */
  --font-sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --text-xs: 0.8125rem;
  --text-sm: 0.9375rem;
  --text-base: 1.0625rem;
  --text-lg: clamp(1.125rem, 1.05rem + 0.35vw, 1.3125rem);
  --text-xl: clamp(1.375rem, 1.2rem + 0.8vw, 1.875rem);
  --text-2xl: clamp(1.875rem, 1.5rem + 1.6vw, 2.75rem);
  --text-3xl: clamp(2.75rem, 2rem + 3.5vw, 4.75rem);
  --leading-tight: 1.1;
  --leading-snug: 1.35;
  --leading-body: 1.65;
  --tracking-tight: -0.02em;
  --tracking-label: 0.08em;

  /* Spacing */
  --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;
  --space-section: clamp(3rem, 2rem + 4vw, 5.5rem);

  /* Layout */
  --width-container: 72rem;
  --width-prose: 42rem;
  --gutter: clamp(1rem, 0.5rem + 2.5vw, 2rem);
  --header-height: 4rem;

  /* Shape and motion */
  --radius-sm: 4px;
  --radius: 6px;
  --border: 1px solid var(--color-border);
  --duration: 150ms;
  --ease: cubic-bezier(0.2, 0, 0, 1);
}

/* Dark theme, chosen with the theme switch… */
:root[data-theme="dark"] {
  color-scheme: dark;
  --color-bg: #111214;
  --color-surface: #18191C;
  --color-surface-muted: #202226;
  --color-text: #EDEBE6;
  --color-text-muted: #A5A8AF;
  --color-border: #2B2D32;
  --color-border-strong: #4A4D55;
  --color-border-input: #6A6E76;
  --color-accent: #FF8F57;
  --color-accent-hover: #FFAD85;
  --color-accent-soft: #2A1B13;
  --color-on-accent: #16171B;
  --color-grid: rgb(237 235 230 / 5%);
}

/* …or taken from the operating system when no choice has been made. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --color-bg: #111214;
    --color-surface: #18191C;
    --color-surface-muted: #202226;
    --color-text: #EDEBE6;
    --color-text-muted: #A5A8AF;
    --color-border: #2B2D32;
    --color-border-strong: #4A4D55;
    --color-border-input: #6A6E76;
    --color-accent: #FF8F57;
    --color-accent-hover: #FFAD85;
    --color-accent-soft: #2A1B13;
    --color-on-accent: #16171B;
    --color-grid: rgb(237 235 230 / 5%);
  }
}

/* ==========================================================================
   Fonts: IBM Plex Sans and IBM Plex Mono (SIL Open Font License 1.1),
   self-hosted from /assets/fonts/ — see assets/fonts/OFL.txt.
   ========================================================================== */

@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 100 700;
  font-display: swap;
  src: url("../fonts/ibm-plex-sans-latin-variable.woff2") format("woff2");
  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: "IBM Plex Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/ibm-plex-mono-latin-400.woff2") format("woff2");
  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: "IBM Plex Mono";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("../fonts/ibm-plex-mono-latin-500.woff2") format("woff2");
  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;
}

/* ==========================================================================
   Base: element defaults and accessibility helpers
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-height) + var(--space-4));
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

main {
  flex: 1 0 auto;
}

/* The skip link moves focus here; the whole region needs no outline. */
main:focus {
  outline: none;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 600;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  text-wrap: balance;
}

p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

p {
  text-wrap: pretty;
}

a {
  color: var(--color-accent);
  text-decoration-thickness: 0.075em;
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--color-accent-hover);
  text-decoration-thickness: 0.125em;
}

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

strong {
  font-weight: 600;
}

img {
  max-width: 100%;
  height: auto;
}

.icon {
  display: inline-block;
  flex: none;
  width: 1.25em;
  height: 1.25em;
  vertical-align: -0.25em;
}

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

code {
  padding: 0.1em 0.35em;
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-muted);
}

hr {
  height: 0;
  margin: var(--space-6) 0;
  border: 0;
  border-top: var(--border);
}

::selection {
  background-color: var(--color-accent-soft);
  color: var(--color-text);
}

[hidden] {
  display: none !important;
}

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

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ==========================================================================
   Layout: container, header, navigation, footer, page structure
   ========================================================================== */

.container {
  width: 100%;
  max-width: calc(var(--width-container) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  z-index: 100;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius);
  background-color: var(--color-text);
  color: var(--color-bg);
  font-weight: 600;
  text-decoration: none;
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: none;
}

.skip-link:hover {
  color: var(--color-bg);
}

/* --------------------------------------------------------------------------
   Header
   Small screens: brand · theme · menu, with the navigation on its own row.
   Wide screens:  brand · navigation · theme.
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: var(--border);
  background-color: var(--color-bg);
}

.site-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  column-gap: var(--space-2);
  min-height: var(--header-height);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  margin-right: auto;
  padding-block: var(--space-3);
  color: var(--color-text);
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
}

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

.brand-mark {
  flex: none;
  width: 1.75rem;
  height: 1.75rem;
}

.brand-mark rect {
  fill: var(--color-accent);
}

.brand-mark path {
  fill: none;
  stroke: var(--color-on-accent);
  stroke-width: 3.25;
  stroke-linecap: square;
}

.header-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-width: 2.75rem;
  min-height: 2.75rem;
  padding: 0 var(--space-3);
  border: var(--border);
  border-radius: var(--radius);
  background-color: transparent;
  color: var(--color-text);
  font: inherit;
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--duration) var(--ease), border-color var(--duration) var(--ease);
}

.header-button:hover {
  border-color: var(--color-border-strong);
  background-color: var(--color-surface);
}

/* Both buttons need JavaScript, so they only appear when it is running. */
.no-js .header-button {
  display: none;
}

.theme-toggle {
  order: 1;
  padding: 0;
}

.nav-toggle {
  order: 2;
}

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

.nav-toggle__close,
.nav-toggle[aria-expanded="true"] .nav-toggle__open {
  display: none;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__close {
  display: inline-block;
}

/* Theme switch icon: a moon in the light theme, a sun in the dark theme. */
.theme-toggle__sun,
:root[data-theme="dark"] .theme-toggle__moon {
  display: none;
}

:root[data-theme="dark"] .theme-toggle__sun {
  display: inline-block;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle__moon {
    display: none;
  }

  :root:not([data-theme="light"]) .theme-toggle__sun {
    display: inline-block;
  }
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin: 0;
  padding: 0 0 var(--space-3);
  list-style: none;
}

.site-nav__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  min-height: 2.75rem;
  padding: 0 var(--space-3);
  border-radius: var(--radius);
  color: var(--color-text-muted);
  font-weight: 500;
  text-decoration: none;
}

.site-nav__link .icon {
  width: 0.875rem;
  height: 0.875rem;
}

.site-nav__link:hover {
  background-color: var(--color-surface-muted);
  color: var(--color-text);
}

.site-nav__link[aria-current="page"] {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.5em;
}

/* Collapsible menu on small screens (only when JavaScript is running). */
@media (max-width: 47.99em) {
  .js .site-nav {
    display: none;
    max-height: calc(100vh - var(--header-height));
    max-height: calc(100dvh - var(--header-height));
    overflow-y: auto;
  }

  .js .nav-toggle[aria-expanded="true"] ~ .site-nav {
    display: block;
  }

  .js .site-nav__list {
    flex-direction: column;
    gap: 0;
    padding: var(--space-2) 0 var(--space-4);
    border-top: var(--border);
  }

  .js .site-nav__link {
    display: flex;
    padding-inline: var(--space-2);
  }
}

@media (min-width: 48em) {
  .nav-toggle {
    display: none !important;
  }

  .site-nav {
    order: 1;
    flex-basis: auto;
  }

  .site-nav__list {
    flex-wrap: nowrap;
    padding: 0;
  }

  .theme-toggle {
    order: 2;
    margin-left: var(--space-2);
  }
}

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

.site-footer {
  padding-block: var(--space-8) var(--space-6);
  border-top: var(--border);
  background-color: var(--color-surface);
  font-size: var(--text-sm);
}

.site-footer__top {
  display: grid;
  gap: var(--space-7);
}

.site-footer__intro p {
  max-width: 22rem;
  margin-top: var(--space-4);
  color: var(--color-text-muted);
}

.site-footer__handles {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.site-footer__handles strong {
  color: var(--color-text);
  font-weight: 500;
}

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

.footer-group__title {
  margin-bottom: var(--space-3);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

.footer-group__list {
  display: grid;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-group__list a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 2rem;
  color: var(--color-text);
  text-decoration: none;
  overflow-wrap: anywhere;
}

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

.footer-group__list .icon {
  width: 1rem;
  height: 1rem;
}

.footer-group--email {
  grid-column: 1 / -1;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2) var(--space-5);
  margin-top: var(--space-8);
  padding-top: var(--space-5);
  border-top: var(--border);
  color: var(--color-text-muted);
}

.site-footer__bottom a {
  color: var(--color-text);
}

@media (min-width: 40em) {
  .site-footer__nav {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .footer-group--email {
    grid-column: auto;
  }
}

@media (min-width: 64em) {
  .site-footer__top {
    gap: var(--space-8);
  }

  .site-footer__intro {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4) var(--space-7);
    padding-bottom: var(--space-7);
    border-bottom: var(--border);
  }

  .site-footer__intro p {
    margin-top: 0;
  }

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

/* --------------------------------------------------------------------------
   Page structure
   -------------------------------------------------------------------------- */

.page-header {
  position: relative;
  isolation: isolate;
  padding-block: clamp(2.75rem, 1.75rem + 4.5vw, 5.5rem) clamp(2rem, 1.5rem + 2vw, 3rem);
  border-bottom: var(--border);
  overflow: hidden;
}

.page-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(var(--color-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid) 1px, transparent 1px);
  background-size: 2rem 2rem;
  -webkit-mask-image: linear-gradient(to left, #000, transparent 70%);
  mask-image: linear-gradient(to left, #000, transparent 70%);
}

.page-header__title {
  max-width: 20ch;
  font-size: var(--text-2xl);
}

.page-header__lead {
  max-width: 42rem;
  margin-top: var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--text-lg);
  line-height: var(--leading-snug);
}

.page-header__meta {
  margin-top: var(--space-5);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.page-body {
  padding-block: var(--space-7) var(--space-section);
}

.section {
  padding-block: var(--space-section);
  border-top: var(--border);
}

.section:first-child {
  border-top: 0;
}

.section--surface {
  background-color: var(--color-surface);
}

.section-header {
  display: grid;
  gap: var(--space-4);
  margin-bottom: var(--space-7);
}

.section-title {
  font-size: var(--text-2xl);
}

.section-title__index {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
}

.section-title__index::after {
  content: "";
  width: 2.5rem;
  height: 1px;
  background-color: currentColor;
}

.section-header__lead {
  max-width: 40rem;
  color: var(--color-text-muted);
  font-size: var(--text-lg);
  line-height: var(--leading-snug);
}

.section-header__action {
  justify-self: start;
}

@media (min-width: 64em) {
  .section-header {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: end;
    column-gap: var(--space-8);
  }

  .section-header__action {
    grid-column: 2;
  }
}

* + .page-section {
  margin-top: var(--space-8);
  padding-top: var(--space-7);
  border-top: var(--border);
}

.page-section > h2 {
  margin-bottom: var(--space-5);
  font-size: var(--text-xl);
}

/* Page with an "On this page" list */
.with-toc {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-7);
  padding-block: var(--space-7) var(--space-section);
}

@media (min-width: 64em) {
  .with-toc {
    grid-template-columns: 14rem minmax(0, 1fr);
    align-items: start;
    gap: var(--space-8);
  }

  .with-toc__aside {
    position: sticky;
    top: calc(var(--header-height) + var(--space-6));
    max-height: calc(100vh - var(--header-height) - var(--space-7));
    overflow-y: auto;
  }
}

/* ==========================================================================
   Components
   ========================================================================== */

/* Eyebrow: small monospace label above a heading ------------------------- */

.eyebrow {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  flex: none;
  width: 0.5rem;
  height: 0.5rem;
  background-color: var(--color-accent);
}

/* Buttons ---------------------------------------------------------------- */

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 2.875rem;
  padding: 0.625rem 1.125rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font: inherit;
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--duration) var(--ease), border-color var(--duration) var(--ease), color var(--duration) var(--ease);
}

.button .icon {
  width: 1.125rem;
  height: 1.125rem;
}

.button--primary {
  background-color: var(--color-accent);
  color: var(--color-on-accent);
}

.button--primary:hover {
  background-color: var(--color-accent-hover);
  color: var(--color-on-accent);
}

.button--secondary {
  border-color: var(--color-border-strong);
  background-color: var(--color-surface);
  color: var(--color-text);
}

.button--secondary:hover {
  border-color: var(--color-text);
  color: var(--color-text);
}

.button--ghost {
  padding-inline: var(--space-2);
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-border-strong);
  text-underline-offset: 0.3em;
}

.button--ghost:hover {
  color: var(--color-text);
  text-decoration-color: var(--color-accent);
}

/* Standalone text link with an arrow */
.text-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 500;
}

.text-link .icon {
  width: 1rem;
  height: 1rem;
  transition: transform var(--duration) var(--ease);
}

.text-link:hover .icon {
  transform: translateX(3px);
}

/* Spec card: monospace key/value panel with registration marks ----------- */

.spec-card {
  position: relative;
  border: var(--border);
  border-radius: var(--radius);
  background-color: var(--color-surface);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.5;
}

.spec-card::before,
.spec-card::after {
  content: "";
  position: absolute;
  width: 0.875rem;
  height: 0.875rem;
  border: 2px solid var(--color-accent);
}

.spec-card::before {
  top: -0.5rem;
  left: -0.5rem;
  border-right: 0;
  border-bottom: 0;
}

.spec-card::after {
  right: -0.5rem;
  bottom: -0.5rem;
  border-top: 0;
  border-left: 0;
}

.spec-card__header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-1) var(--space-4);
  padding: var(--space-3) var(--space-5);
  border-bottom: var(--border);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

.spec-card__list {
  padding-block: var(--space-3);
}

.spec-card__row {
  display: grid;
  grid-template-columns: 6.25rem minmax(0, 1fr);
  gap: var(--space-3);
  padding: 0.375rem var(--space-5);
}

.spec-card__row dt {
  color: var(--color-text-muted);
}

.spec-card__row dd {
  overflow-wrap: anywhere;
}

/* Feature grid: cells that share hairline borders ------------------------ */

.feature-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  margin: 0;
  padding: 0;
  border-top: var(--border);
  border-left: var(--border);
  list-style: none;
}

.feature {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-5);
  border-right: var(--border);
  border-bottom: var(--border);
  background-color: var(--color-surface);
}

.feature__icon {
  width: 1.5rem;
  height: 1.5rem;
  color: var(--color-accent);
}

.feature__title {
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
}

.feature__text {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.55;
}

@media (min-width: 36em) {
  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 64em) {
  .feature-grid--4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* Spec list and tags ----------------------------------------------------- */

.spec-list {
  border-top: var(--border);
}

.spec-list__row {
  display: grid;
  gap: var(--space-3);
  padding-block: var(--space-4);
  border-bottom: var(--border);
}

.spec-list__term {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

@media (min-width: 48em) {
  .spec-list__row {
    grid-template-columns: 13rem minmax(0, 1fr);
    align-items: baseline;
    gap: var(--space-5);
  }
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 2rem;
  padding: 0.25rem 0.75rem;
  border: var(--border);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.3;
}

/* Link cards (profiles) -------------------------------------------------- */

.link-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 18rem), 1fr));
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.link-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  height: 100%;
  padding: var(--space-4) var(--space-5);
  border: var(--border);
  border-radius: var(--radius);
  background-color: var(--color-surface);
  color: var(--color-text);
  text-decoration: none;
  transition: border-color var(--duration) var(--ease);
}

.link-card:hover {
  border-color: var(--color-text);
  color: var(--color-text);
}

.link-card__icon {
  width: 1.5rem;
  height: 1.5rem;
  margin-top: 0.125rem;
}

.link-card__body {
  display: flex;
  flex: 1;
  flex-direction: column;
  min-width: 0;
}

.link-card__name {
  font-weight: 600;
}

.link-card__handle {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  overflow-wrap: anywhere;
}

.link-card__note {
  margin-top: var(--space-1);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.45;
}

.link-card__arrow {
  width: 1rem;
  height: 1rem;
  margin-top: 0.25rem;
  color: var(--color-text-muted);
  transition: transform var(--duration) var(--ease), color var(--duration) var(--ease);
}

.link-card:hover .link-card__arrow {
  color: var(--color-accent);
  transform: translate(2px, -2px);
}

.link-group + .link-group {
  margin-top: var(--space-6);
}

.link-group__title {
  margin-bottom: var(--space-3);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

/* Contact cards ---------------------------------------------------------- */

.contact-grid {
  display: grid;
  gap: var(--space-4);
}

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

.contact-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: clamp(1.25rem, 1rem + 1.5vw, 2rem);
  border: var(--border);
  border-radius: var(--radius);
  background-color: var(--color-surface);
}

.contact-card__title {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-lg);
}

.contact-card__title .icon {
  width: 1.375rem;
  height: 1.375rem;
  color: var(--color-accent);
}

.contact-card__summary {
  color: var(--color-text-muted);
}

.contact-card__purposes-title {
  margin-top: var(--space-2);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

.email-list {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.email-list__item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: var(--border);
  border-radius: var(--radius);
  background-color: var(--color-bg);
}

.email-list__label {
  flex-basis: 100%;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.email-list__link {
  margin-right: auto;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  overflow-wrap: anywhere;
}

.copy-button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  min-height: 2rem;
  padding: 0 var(--space-3);
  border: var(--border);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  color: var(--color-text);
  font: inherit;
  font-size: var(--text-xs);
  font-weight: 500;
  cursor: pointer;
}

.copy-button:hover {
  border-color: var(--color-border-strong);
}

.copy-button .icon {
  width: 0.875rem;
  height: 0.875rem;
}

.no-js .copy-button {
  display: none;
}

.check-list {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--text-sm);
}

.check-list li {
  display: flex;
  gap: var(--space-2);
}

.check-list .icon {
  width: 1rem;
  height: 1rem;
  margin-top: 0.2em;
  color: var(--color-accent);
}

/* Contact form ----------------------------------------------------------- */

.contact-form {
  display: grid;
  gap: var(--space-5);
  max-width: var(--width-prose);
  padding: clamp(1.25rem, 1rem + 1.5vw, 2rem);
  border: var(--border);
  border-radius: var(--radius);
  background-color: var(--color-surface);
}

@media (min-width: 40em) {
  .contact-form {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .form-field--wide,
  .contact-form__notice,
  .contact-form__actions {
    grid-column: 1 / -1;
  }
}

/* Spam trap: hidden from everyone, filled in only by bots. */
.contact-form__trap {
  display: none !important;
}

.form-field {
  display: grid;
  align-content: start;
  gap: var(--space-2);
}

.form-field__label {
  font-size: var(--text-sm);
  font-weight: 600;
}

.form-field__required {
  color: var(--color-text-muted);
  font-weight: 400;
}

.form-field__input {
  width: 100%;
  min-height: 2.875rem;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--color-border-input);
  border-radius: var(--radius);
  background-color: var(--color-bg);
  color: var(--color-text);
  font: inherit;
  line-height: 1.5;
}

.form-field__input:hover {
  border-color: var(--color-text-muted);
}

.form-field__input:focus-visible {
  border-color: var(--color-accent);
  outline-offset: 1px;
}

textarea.form-field__input {
  min-height: 10rem;
  resize: vertical;
}

.form-field__hint,
.contact-form__notice {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.contact-form__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3) var(--space-5);
}

.contact-form__status {
  font-size: var(--text-sm);
  font-weight: 500;
}

.contact-form__status[data-state="pending"] {
  color: var(--color-text-muted);
}

.button[aria-disabled="true"] {
  opacity: 0.7;
  cursor: progress;
}

/* Callout: a wide highlighted panel -------------------------------------- */

.callout {
  display: grid;
  gap: var(--space-5);
  padding: clamp(1.5rem, 1rem + 2.5vw, 3rem);
  border: var(--border);
  border-radius: var(--radius);
  background-color: var(--color-surface);
}

.callout__icon {
  width: 2.75rem;
  height: 2.75rem;
}

.callout__title {
  font-size: var(--text-xl);
}

.callout__text {
  max-width: 38rem;
  margin-top: var(--space-2);
  color: var(--color-text-muted);
}

@media (min-width: 48em) {
  .callout {
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: var(--space-6);
  }
}

/* Note: a quiet bordered paragraph -------------------------------------- */

.note {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border: var(--border);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.note .icon {
  width: 1.125rem;
  height: 1.125rem;
  margin-top: 0.15em;
  color: var(--color-accent);
}

.note strong {
  color: var(--color-text);
}

/* Table of contents ------------------------------------------------------ */

.toc {
  font-size: var(--text-sm);
}

.toc__title {
  margin-bottom: var(--space-3);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

.toc__list {
  margin: 0;
  padding: 0;
  border-left: var(--border);
  list-style: none;
  counter-reset: toc;
}

.toc__list li {
  counter-increment: toc;
}

.toc__list a {
  display: flex;
  gap: var(--space-2);
  margin-left: -1px;
  padding: 0.3rem 0 0.3rem var(--space-4);
  border-left: 2px solid transparent;
  color: var(--color-text-muted);
  line-height: 1.4;
  text-decoration: none;
}

.toc__list a::before {
  content: counter(toc, decimal-leading-zero);
  flex: none;
  padding-top: 0.1em;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.toc__list a:hover {
  border-left-color: var(--color-accent);
  color: var(--color-text);
}

/* Prose: long-form text (policy pages and Markdown content) ------------- */

.prose {
  max-width: var(--width-prose);
  overflow-wrap: anywhere;
}

.prose > * + * {
  margin-top: var(--space-4);
}

.prose h2 {
  margin-top: var(--space-7);
  padding-top: var(--space-6);
  border-top: var(--border);
  font-size: var(--text-xl);
}

.prose > h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.prose h3 {
  margin-top: var(--space-6);
  font-size: var(--text-lg);
}

.prose h2 + *,
.prose h3 + * {
  margin-top: var(--space-3);
}

.prose ul,
.prose ol {
  padding-left: 1.25rem;
}

.prose li + li {
  margin-top: var(--space-2);
}

.prose li::marker {
  color: var(--color-accent);
}

.prose dl {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: var(--border);
}

.prose dt {
  padding-top: var(--space-3);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

.prose dd {
  padding-bottom: var(--space-3);
  border-bottom: var(--border);
}

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

  .prose dt {
    padding-bottom: var(--space-3);
    border-bottom: var(--border);
  }

  .prose dd {
    padding-top: var(--space-3);
  }
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
  line-height: 1.45;
}

.prose th,
.prose td {
  padding: var(--space-3);
  border: var(--border);
  text-align: left;
  vertical-align: top;
}

.prose th {
  background-color: var(--color-surface-muted);
  font-weight: 600;
}

.prose .summary {
  padding: var(--space-5);
  border: var(--border);
  border-radius: var(--radius);
  background-color: var(--color-surface);
}

.prose .summary > * + * {
  margin-top: var(--space-2);
}

/* ==========================================================================
   Blog: post list, post pages, and tags
   ========================================================================== */

/* Post list ---------------------------------------------------------------- */

.post-year__count {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 400;
  letter-spacing: 0;
}

.post-list {
  display: grid;
  gap: var(--space-4);
  max-width: 60rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.post-card {
  display: grid;
  overflow: hidden;
  border: var(--border);
  border-radius: var(--radius);
  background-color: var(--color-surface);
}

/* The cover fills its frame; the text, not the image, sets the card's height. */
.post-card__media {
  position: relative;
  aspect-ratio: 16 / 9;
  border-bottom: var(--border);
  background-color: var(--color-surface-muted);
}

.post-card__image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Wider screens: the cover sits to the right of the text. */
@media (min-width: 48em) {
  .post-card--with-image {
    grid-template-columns: minmax(0, 1fr) 16rem;
  }

  .post-card--with-image .post-card__media {
    order: 2;
    min-height: 10rem;
    aspect-ratio: auto;
    border-bottom: 0;
    border-left: var(--border);
  }
}

.post-card__body {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-5);
}

.post-card__title {
  font-size: var(--text-lg);
  line-height: var(--leading-snug);
  letter-spacing: -0.01em;
  overflow-wrap: anywhere;
}

.post-card__title a {
  color: var(--color-text);
  text-decoration: none;
}

.post-card__title a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.post-card__summary {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.post-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-4);
  margin-top: auto;
  padding-top: var(--space-2);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

/* Tags ----------------------------------------------------------------------- */

.tag-list--small .tag {
  min-height: 1.75rem;
  padding: 0.125rem 0.5rem;
  font-size: var(--text-xs);
}

.tag--link {
  color: var(--color-text);
  text-decoration: none;
  overflow-wrap: anywhere;
}

.tag--link:hover {
  border-color: var(--color-accent);
  color: var(--color-text);
}

.tag__count {
  margin-left: var(--space-2);
  color: var(--color-text-muted);
}

.post-links {
  display: grid;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.post-links li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-4);
}

.post-links a {
  font-weight: 500;
  overflow-wrap: anywhere;
}

.post-links time {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

/* Post page ------------------------------------------------------------------ */

.eyebrow__link {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--color-border-strong);
}

.eyebrow__link:hover {
  color: var(--color-text);
  text-decoration-color: var(--color-accent);
}

.post__title {
  max-width: 28ch;
  overflow-wrap: anywhere;
}

/* Small and medium screens: a compact two-column block above the post. */
.post-details__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: var(--space-5);
  border-top: var(--border);
  font-size: var(--text-sm);
}

.post-details__row--wide {
  grid-column: 1 / -1;
}

.post-details__row {
  display: grid;
  gap: var(--space-1);
  padding-block: var(--space-3);
  border-bottom: var(--border);
}

.post-details__row dt {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

.post-details__row dd {
  overflow-wrap: anywhere;
}

.post-details__row .tag-list {
  margin-top: var(--space-1);
}

.post-details__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-5);
  margin: var(--space-4) 0 0;
  padding: 0;
  list-style: none;
  font-size: var(--text-sm);
}

.post-details__actions a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 2rem;
}

.post-details__actions .icon {
  width: 1rem;
  height: 1rem;
}

@media (min-width: 40em) and (max-width: 63.99em) {
  .post-details__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* Large screens: one column beside the post. */
@media (min-width: 64em) {
  .post-details__list {
    grid-template-columns: minmax(0, 1fr);
  }

  .post-details__actions {
    display: grid;
    justify-items: start;
  }
}

.post__cover {
  margin-bottom: var(--space-7);
}

/* The whole cover is shown: tall images are scaled to fit, never cropped. */
.post__cover img {
  display: block;
  width: auto;
  max-width: 100%;
  height: auto;
  max-height: 40rem;
  border: var(--border);
  border-radius: var(--radius);
  background-color: var(--color-surface-muted);
}

/* Long-form content written in posts (extends .prose) */

/* Tall images are scaled to fit on screen. */
.prose img {
  display: block;
  width: auto;
  height: auto;
  max-height: 48rem;
  border-radius: var(--radius-sm);
}

.prose a img {
  display: inline-block;
}

.prose blockquote {
  padding-left: var(--space-4);
  border-left: 3px solid var(--color-border-strong);
  color: var(--color-text-muted);
}

.prose blockquote > * + * {
  margin-top: var(--space-3);
}

.prose pre {
  overflow-x: auto;
  padding: var(--space-4);
  border: var(--border);
  border-radius: var(--radius);
  background-color: var(--color-surface-muted);
  font-size: var(--text-sm);
  line-height: 1.5;
  overflow-wrap: normal;
}

.prose pre code {
  padding: 0;
  background: none;
  font-size: inherit;
}

.table-scroll {
  overflow-x: auto;
}

.table-scroll table {
  overflow-wrap: normal;
}

.prose kbd {
  padding: 0.1em 0.4em;
  border: var(--border);
  border-bottom-width: 2px;
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
}

.prose mark {
  background-color: var(--color-accent-soft);
  color: var(--color-text);
}

.prose details {
  padding: var(--space-3) var(--space-4);
  border: var(--border);
  border-radius: var(--radius);
  background-color: var(--color-surface);
}

.prose summary {
  font-weight: 600;
  cursor: pointer;
}

.prose details[open] summary {
  margin-bottom: var(--space-3);
}

/* Newer / older post */

.post-nav {
  display: grid;
  gap: var(--space-3);
  max-width: var(--width-prose);
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: var(--border);
}

.post-nav__link {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-4) var(--space-5);
  border: var(--border);
  border-radius: var(--radius);
  background-color: var(--color-surface);
  color: var(--color-text);
  text-decoration: none;
}

.post-nav__link:hover {
  border-color: var(--color-text);
  color: var(--color-text);
}

.post-nav__label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

.post-nav__label .icon {
  width: 0.875rem;
  height: 0.875rem;
}

.post-nav__title {
  font-weight: 600;
  overflow-wrap: anywhere;
}

.post-nav__link--older {
  text-align: right;
}

.post-nav__link--older .post-nav__label {
  justify-content: flex-end;
}

.post-nav__all {
  justify-self: start;
  margin-top: var(--space-2);
}

.post-nav__all:hover .icon {
  transform: translateX(-3px);
}

@media (min-width: 40em) {
  .post-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .post-nav__link--older {
    grid-column: 2;
  }

  .post-nav__all {
    grid-column: 1 / -1;
  }
}

/* Spacing inside page sections on the blog pages */

.page-section > .principles + .note,
.page-section > .tag-list + * {
  margin-top: var(--space-5);
}

@media print {
  .post-details__actions,
  .post-nav {
    display: none !important;
  }
}

/* ==========================================================================
   Page-specific styles
   ========================================================================== */

/* Home: hero ------------------------------------------------------------- */

.hero {
  position: relative;
  isolation: isolate;
  padding-block: clamp(3rem, 1.5rem + 6vw, 7rem);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(var(--color-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid) 1px, transparent 1px);
  background-size: 2rem 2rem;
  -webkit-mask-image: radial-gradient(ellipse at 75% 35%, #000 15%, transparent 70%);
  mask-image: radial-gradient(ellipse at 75% 35%, #000 15%, transparent 70%);
}

.hero__grid {
  display: grid;
  gap: var(--space-7);
}

.hero__title {
  font-size: var(--text-3xl);
  line-height: 1;
  letter-spacing: -0.04em;
}

.hero__tagline {
  max-width: 28ch;
  text-wrap: balance;
  margin-top: var(--space-4);
  font-size: var(--text-xl);
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.015em;
}

.hero__intro {
  max-width: 36rem;
  margin-top: var(--space-5);
  color: var(--color-text-muted);
}

.hero__intro strong {
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 0.9em;
  font-weight: 500;
}

.hero .button-row {
  margin-top: var(--space-6);
}

@media (min-width: 64em) {
  .hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
    gap: var(--space-8);
  }
}

/* Home: about summary ---------------------------------------------------- */

.split {
  display: grid;
  gap: var(--space-5);
}

.split > * + * {
  margin-top: 0;
}

.split p {
  max-width: 38rem;
}

@media (min-width: 64em) {
  .split {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--space-8);
  }
}

.section-footer {
  margin-top: var(--space-6);
}

/* About: introduction with the identity panel --------------------------- */

.intro-grid {
  display: grid;
  gap: var(--space-7);
  align-items: start;
}

.intro-grid__text > * + * {
  margin-top: var(--space-4);
}

.intro-grid__text p:first-child {
  font-size: var(--text-lg);
  line-height: var(--leading-snug);
}

@media (min-width: 64em) {
  .intro-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-8);
  }
}

.identity {
  display: grid;
  gap: var(--space-4);
}

.identity__title {
  font-size: var(--text-lg);
}

.identity__list {
  border-top: var(--border);
}

.identity__row {
  display: grid;
  gap: var(--space-1);
  padding-block: var(--space-3);
  border-bottom: var(--border);
}

.identity__row dt {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

.identity__row dd {
  font-size: var(--text-sm);
}

.identity__value {
  font-family: var(--font-mono);
  font-weight: 500;
}

.principles {
  display: grid;
  gap: var(--space-4);
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: principle;
}

.principles li {
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr);
  gap: var(--space-2);
  counter-increment: principle;
}

.principles li::before {
  content: counter(principle, decimal-leading-zero);
  padding-top: 0.2em;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
}

.principles h3 {
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
}

.principles p {
  margin-top: var(--space-1);
  color: var(--color-text-muted);
}

.bullet-list {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  padding-left: 1.25rem;
}

.bullet-list li::marker {
  color: var(--color-accent);
}

.page-section > p + p,
.page-section > p + ul,
.page-section > ul + p,
.page-section > p + .button-row,
.page-section > p + .link-grid,
.page-section > p + .contact-form,
.page-section > .feature-grid + p,
.page-section > .spec-list + p {
  margin-top: var(--space-4);
}

.page-section > p {
  max-width: var(--width-prose);
}

.cta-panel {
  display: grid;
  gap: var(--space-4);
  justify-items: start;
  margin-top: var(--space-8);
  padding: clamp(1.5rem, 1rem + 2.5vw, 3rem);
  border: var(--border);
  border-radius: var(--radius);
  background-color: var(--color-surface);
}

.cta-panel__title {
  font-size: var(--text-xl);
}

.cta-panel p {
  max-width: 36rem;
  color: var(--color-text-muted);
}

/* 404 -------------------------------------------------------------------- */

.error-page {
  position: relative;
  isolation: isolate;
  padding-block: clamp(4rem, 2rem + 8vw, 9rem);
  overflow: hidden;
}

.error-page::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(var(--color-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid) 1px, transparent 1px);
  background-size: 2rem 2rem;
  -webkit-mask-image: radial-gradient(ellipse at 50% 40%, #000 10%, transparent 65%);
  mask-image: radial-gradient(ellipse at 50% 40%, #000 10%, transparent 65%);
}

.error-page__code {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: clamp(4rem, 2rem + 10vw, 9rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.04em;
}

.error-page__title {
  margin-top: var(--space-4);
  font-size: var(--text-2xl);
}

.error-page__text {
  max-width: 34rem;
  margin-top: var(--space-4);
  color: var(--color-text-muted);
}

.error-page .button-row {
  margin-top: var(--space-6);
}

/* ==========================================================================
   Print
   ========================================================================== */

@media print {
  .site-header,
  .site-footer__nav,
  .skip-link,
  .button-row,
  .copy-button,
  .with-toc__aside,
  .hero::before,
  .page-header::before {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  .with-toc {
    display: block;
  }

  .prose a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.85em;
    overflow-wrap: anywhere;
  }
}