/*
 * Eager styles: the only render-blocking stylesheet. Tokens, base type, the header, sections and
 * buttons. Budget: 8 KB gzip (budgets.json). Block styles live with their block; post-LCP globals
 * go in lazy.css.
 */
:root {
  color-scheme: light dark;

  /* colors (contrast ≥ 4.5:1 for text on background) */
  --background-color: #fff;
  --light-color: #f4f4f5;
  --dark-color: #52525b;
  --text-color: #18181b;
  --link-color: #2448d8;
  --link-hover-color: #1a37a8;
  --on-image-color: #fff;
  --on-accent-color: #fff;

  /* fonts: each web font has a metric-matched fallback below, so the swap doesn't shift layout */
  --body-font-family: system-ui, -apple-system, "Segoe UI", roboto, sans-serif;
  --heading-font-family: var(--body-font-family);
  --mono-font-family: ui-monospace, "SF Mono", menlo, consolas, monospace;

  /* sizes (mobile first) */
  --body-font-size-m: 18px;
  --body-font-size-s: 16px;
  --body-font-size-xs: 14px;
  --heading-font-size-xxl: 40px;
  --heading-font-size-xl: 32px;
  --heading-font-size-l: 26px;
  --heading-font-size-m: 22px;
  --heading-font-size-s: 20px;
  --heading-font-size-xs: 18px;
  --content-width: 1200px;
  --nav-height: 64px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background-color: #0f0f11;
    --light-color: #1c1c20;
    --dark-color: #a1a1aa;
    --text-color: #f4f4f5;
    --link-color: #8ea6ff;
    --link-hover-color: #b8c7ff;
    --on-accent-color: #0f0f11;
  }
}

@media (width >= 900px) {
  :root {
    --heading-font-size-xxl: 56px;
    --heading-font-size-xl: 40px;
    --heading-font-size-l: 30px;
  }
}

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

body {
  margin: 0;
  background-color: var(--background-color);
  color: var(--text-color);
  font-family: var(--body-font-family);
  font-size: var(--body-font-size-m);
  line-height: 1.6;
  text-rendering: optimizespeed;
}

body.nav-open {
  overflow-y: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin-top: 0.8em;
  margin-bottom: 0.25em;
  font-family: var(--heading-font-family);
  font-weight: 700;
  line-height: 1.2;
  text-wrap: balance;
  scroll-margin: calc(var(--nav-height) + 16px);
}

h1 {
  font-size: var(--heading-font-size-xxl);
}
h2 {
  font-size: var(--heading-font-size-xl);
}
h3 {
  font-size: var(--heading-font-size-l);
}
h4 {
  font-size: var(--heading-font-size-m);
}
h5 {
  font-size: var(--heading-font-size-s);
}
h6 {
  font-size: var(--heading-font-size-xs);
}

p,
ol,
ul,
pre,
blockquote,
figure {
  margin-top: 0.8em;
  margin-bottom: 0.25em;
}

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

a:any-link {
  color: var(--link-color);
  text-underline-offset: 0.15em;
}

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

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

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 10;
  padding: 8px 16px;
  background: var(--background-color);
}

.skip-link:focus {
  top: 8px;
}

/* header (always above the fold, so styled here) */
header {
  min-height: var(--nav-height);
  border-bottom: 1px solid var(--light-color);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  max-width: var(--content-width);
  min-height: var(--nav-height);
  margin: 0 auto;
  padding: 0 24px;
}

.nav a:any-link {
  color: currentcolor;
  text-decoration: none;
}

.nav-brand {
  font-weight: 700;
}

.nav-menu summary {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  cursor: pointer;
  list-style: none;
}

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

.nav-menu-icon,
.nav-menu-icon::before,
.nav-menu-icon::after {
  display: block;
  width: 22px;
  height: 2px;
  background: currentcolor;
}

.nav-menu-icon {
  position: relative;
}

.nav-menu-icon::before,
.nav-menu-icon::after {
  content: "";
  position: absolute;
}

.nav-menu-icon::before {
  top: -7px;
}
.nav-menu-icon::after {
  top: 7px;
}

.nav-sections {
  margin: 0;
  padding: 16px 0;
  list-style: none;
}

.nav-sections a:any-link {
  display: block;
  padding: 10px 0;
}

.nav-sections a[aria-current="page"] {
  text-decoration: underline;
}

/* Mobile: the list shows when the <details> toggle is open. Desktop: always, toggle hidden. */
@media (width < 900px) {
  .nav-sections {
    display: none;
    flex-basis: 100%;
  }

  .nav:has(.nav-menu[open]) .nav-sections {
    display: block;
  }
}

@media (width >= 900px) {
  .nav {
    padding: 0 32px;
  }

  .nav-menu {
    display: none;
  }

  .nav-sections {
    display: flex;
    gap: 32px;
    padding: 0;
  }
}

/* rich text that affects layout (kept out of lazy.css so it can't shift the first viewport) */
code,
pre {
  font-family: var(--mono-font-family);
  font-size: var(--body-font-size-s);
}

pre {
  padding: 16px;
  border-radius: 8px;
  background-color: var(--light-color);
  overflow-x: auto;
}

blockquote {
  margin-inline: 0;
  border-left: 4px solid var(--light-color);
  padding-left: 16px;
}

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

table {
  border-collapse: collapse;
  width: 100%;
}

th,
td {
  border-bottom: 1px solid var(--light-color);
  padding: 8px;
  text-align: left;
}

figcaption {
  color: var(--dark-color);
  font-size: var(--body-font-size-s);
}

/* sections */
main > .section {
  margin: 40px 0;
}

main > .section > div {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

main > .section.light,
main > .section.highlight {
  margin: 0;
  padding: 40px 0;
  background-color: var(--light-color);
}

/* Full-bleed blocks opt out of the content column. */
main > .section > .hero-wrapper {
  max-width: none;
  padding: 0;
}

@media (width >= 900px) {
  main > .section > div {
    padding: 0 32px;
  }
}

/* buttons (from the Worker's CTA rule) */
p.button-wrapper {
  margin: 16px 0;
}

a.button:any-link {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  min-height: 44px;
  border: 2px solid var(--text-color);
  border-radius: 2em;
  padding: 0.4em 1.2em;
  font-weight: 600;
  line-height: 1.25;
  text-decoration: none;
}

a.button.primary {
  background-color: var(--text-color);
  color: var(--background-color);
}

a.button.secondary {
  background-color: transparent;
  color: var(--text-color);
}

a.button.accent {
  border-color: var(--link-color);
  background-color: var(--link-color);
  color: var(--on-accent-color);
}

a.button:hover {
  opacity: 0.88;
}

@media (prefers-reduced-motion: reduce) {
  /* !important: a reduced-motion preference must beat every animation (biome.json override). */
  * {
    scroll-behavior: auto !important;
    transition: none !important;
    animation: none !important;
  }
}

/* Preview mode (never cached, never indexed) */
.preview-bar {
  padding: 8px 24px;
  background: #fde68a;
  color: #18181b;
  font-size: var(--body-font-size-xs);
}

.preview-bar a:any-link {
  color: inherit;
}

/* Modern navigation: cross-document view transitions. */
@media (prefers-reduced-motion: no-preference) {
  @view-transition {
    navigation: auto;
  }
}

/*
 * No content-visibility here: on desktop the second section is often in the first viewport, and
 * Chrome lays it out at the intrinsic-size placeholder before its real size, which shifted
 * layout (CLS 0.083 on /blog in the Lighthouse gate). Pages are small enough not to need it.
 */