/* Reset + global chrome: typography, nav, footer, utilities. */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + var(--sp-4));
  scrollbar-gutter: stable;
}

/* ---- scrollbars --------------------------------------------------------
   Cross-browser styling. WebKit gets the explicit pseudo-elements,
   Firefox gets the scrollbar-width/color properties. Same palette for
   both so the chrome matches across engines. Scoped so any descendant
   with its own background (code blocks, tables, the terminal) can
   override via its own `::-webkit-scrollbar` rule.
*/

/* Firefox */
html {
  scrollbar-width: thin;
  scrollbar-color: var(--rule-strong) transparent;
}

/* WebKit / Blink */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
  background: transparent;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background-color: var(--rule-strong);
  background-clip: padding-box;
  border: 2px solid transparent;
  border-radius: 999px;
  transition: background-color var(--dur) var(--ease);
}
::-webkit-scrollbar-thumb:hover {
  background-color: var(--fg-faint);
}
::-webkit-scrollbar-thumb:active {
  background-color: var(--accent);
}
::-webkit-scrollbar-corner {
  background: transparent;
}

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  font-feature-settings: "ss01", "ss02", "cv11";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  display: flex;
  flex-direction: column;
}

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

a {
  color: inherit;
  text-decoration: none;
  text-underline-offset: 3px;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  font-weight: 500;
  letter-spacing: var(--tracking-tight);
}

p {
  margin: 0;
}

ul,
ol {
  padding: 0;
  margin: 0;
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.92em;
  letter-spacing: 0;
}

/* skip link */
.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: var(--sp-3) var(--sp-4);
  background: var(--fg);
  color: var(--bg);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
}
.skip:focus {
  left: var(--sp-4);
  top: var(--sp-4);
}

/* nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  height: var(--nav-h);
  background: color-mix(in oklab, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: var(--hair) solid var(--rule);
}
.nav__wrap {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-6);
}
.nav__brand {
  display: inline-flex;
  align-items: baseline;
  gap: var(--sp-2);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  letter-spacing: 0;
  color: var(--fg);
}
.nav__brand-mark {
  font-weight: 500;
}
.nav__brand-sep {
  color: var(--fg-faint);
}
.nav__brand-sub {
  color: var(--fg-muted);
}
.nav__brand:hover .nav__brand-sub {
  color: var(--fg);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--sp-6);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
}
.nav__links a {
  position: relative;
  color: var(--fg-muted);
  transition: color var(--dur) var(--ease);
}
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -4px;
  height: 1px;
  background: var(--accent);
  transition: right var(--dur) var(--ease);
}
.nav__links a:hover {
  color: var(--fg);
}
.nav__links a:hover::after {
  right: 0;
}
.nav__ext {
  display: inline-flex;
  align-items: center;
  gap: 2px;
}
.nav__ext span {
  font-size: 0.85em;
}

@media (max-width: 540px) {
  .nav__links {
    gap: var(--sp-4);
  }
  .nav__brand-sub {
    display: none;
  }
}

/* footer */
.footer {
  margin-top: auto;
  border-top: var(--hair) solid var(--rule);
  padding: var(--sp-6) 0;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--fg-muted);
}
.footer__wrap {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--sp-4);
  flex-wrap: wrap;
}
.footer__line {
  letter-spacing: 0.02em;
}
.footer__sep {
  color: var(--fg-faint);
}

/* section primitives shared by landing & docs */
.section {
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--sp-9) var(--gutter);
  border-top: var(--hair) solid var(--rule);
}
.section__head {
  display: flex;
  align-items: baseline;
  gap: var(--sp-4);
  margin-bottom: var(--sp-7);
  flex-wrap: wrap;
}
.section__kicker {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--fg-faint);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}
.section__title {
  font-size: var(--fs-3xl);
  letter-spacing: var(--tracking-xtight);
  line-height: var(--lh-tight);
  color: var(--fg);
}
.section__note {
  flex-basis: 100%;
  margin-top: var(--sp-2);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--fg-muted);
}

@media (max-width: 720px) {
  .section {
    padding: var(--sp-7) var(--gutter);
  }
  .section__title {
    font-size: var(--fs-2xl);
  }
}