/* base.css — the design tokens and shared chrome for every generated page.
 *
 * The site is deliberately typographic and light-first: a warm paper ground, a
 * serif display face for headings, one ink-blue accent used only where it means
 * something (links, the current page, a focused control), and colour otherwise
 * reserved for code. Dark mode is the same design with the ground inverted, not
 * a second theme — every colour below is a token, redefined once under
 * prefers-color-scheme and nowhere else.
 *
 * Fonts are the platform's own. A language reference should render instantly
 * and identically offline; a webfont round-trip buys nothing here. */

:root {
  /* ground and ink */
  --paper:      #fcfcfa;
  --paper-2:    #f5f4f0;
  --panel:      #ffffff;
  --ink:        #17171a;
  --ink-2:      #3d3d44;
  --muted:      #67676f;
  --rule:       #e3e2dc;
  --rule-2:     #cfcec6;

  /* the single accent */
  --accent:     #0f4c81;
  --accent-ink: #0b3a63;
  --accent-bg:  #eaf1f8;

  /* code surface and tokens */
  --code-bg:    #f7f6f2;
  --code-rule:  #e3e2dc;
  --c-comment:  #7a7a70;
  --c-key:      #8f2d56;
  --c-type:     #0f6b5c;
  --c-str:      #9a5518;
  --c-num:      #1d4f8c;
  --c-annot:    #6b3fa0;
  --c-fn:       #0f4c81;
  --c-punc:     #6a6a72;
  --c-arg:      #9a5518;

  --radius:     6px;
  --max:        1080px;
  --hdr:        58px;

  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --serif: ui-serif, "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:      #16161a;
    --paper-2:    #1c1c21;
    --panel:      #1a1a1f;
    --ink:        #e6e5e0;
    --ink-2:      #c2c1bb;
    --muted:      #8f8f98;
    --rule:       #2b2b32;
    --rule-2:     #3d3d46;

    --accent:     #7fb0dd;
    --accent-ink: #a8ccec;
    --accent-bg:  #1b2733;

    --code-bg:    #1b1b21;
    --code-rule:  #2b2b32;
    --c-comment:  #7b7b84;
    --c-key:      #e08aa8;
    --c-type:     #64c9b4;
    --c-str:      #d9a066;
    --c-num:      #8fb8e8;
    --c-annot:    #b596e0;
    --c-fn:       #7fb0dd;
    --c-punc:     #8b8b94;
    --c-arg:      #d9a066;
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink-2);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  color: var(--ink);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.005em;
  margin: 0;
}

a { color: var(--accent); text-decoration: none }
a:hover { text-decoration: underline; text-underline-offset: 2px }

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

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px }
.muted { color: var(--muted) }
.mono, code, pre, kbd { font-family: var(--mono) }

/* Inline code carries no chip: the mono face plus the darker ink is already a
   clear enough break from running text, and a tinted box behind every keyword
   in a language reference turns a paragraph into confetti. */
code {
  font-size: 0.905em;
  color: var(--ink);
}
pre code { font-size: inherit }

pre {
  margin: 14px 0 0;
  padding: 15px 17px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.7;
  tab-size: 2;
  background: var(--code-bg);
  border: 1px solid var(--code-rule);
  border-radius: var(--radius);
  color: var(--ink);
}
pre::-webkit-scrollbar { height: 9px }
pre::-webkit-scrollbar-thumb { background: var(--rule-2); border-radius: 5px }

/* syntax tokens, shared by the highlighter and the hand-written terminal block */
.t-com   { color: var(--c-comment); font-style: italic }
.t-key   { color: var(--c-key) }
.t-type  { color: var(--c-type) }
.t-str   { color: var(--c-str) }
.t-num   { color: var(--c-num) }
.t-annot { color: var(--c-annot) }
.t-fn    { color: var(--c-fn) }
.t-punc  { color: var(--c-punc) }
.t-arg   { color: var(--c-arg) }

/* ---------- token cards ------------------------------------------------- *
 * Every page runs the highlighter, so the card chrome lives here rather than
 * in docs.css — the landing page links base.css and site.css only, and a card
 * whose stylesheet never loaded renders as a static block at the end of the
 * body instead of a panel beside the token that was clicked.
 * ----------------------------------------------------------------------- */

.tok { cursor: help; border-bottom: 1px dotted var(--rule-2) }
a.tok { cursor: pointer }

.hovercard {
  /* the script positions this from getBoundingClientRect(), i.e. in viewport
     coordinates, so the card must be fixed, not absolute */
  position: fixed;
  z-index: 90;
  max-width: min(360px, calc(100vw - 24px));
  background: var(--panel);
  border: 1px solid var(--rule-2);
  border-radius: var(--radius);
  box-shadow: 0 8px 24px -12px rgba(0, 0, 0, .35);
  padding: 11px 13px;
  font-size: 13.5px;
  cursor: pointer;
}
.hovercard:hover { border-color: var(--accent) }
.hc-top { display: flex; align-items: center; gap: 9px; margin-bottom: 6px }
.hc-name { font-family: var(--mono); font-size: 13.5px; color: var(--ink) }
.hc-sig { font-family: var(--mono); font-size: 12.5px; color: var(--muted); display: block; margin-bottom: 6px }
.hc-tip { color: var(--ink-2) }
.hc-foot { display: block; margin-top: 8px; font-size: 12px; color: var(--muted) }

/* the kind badge is worn both by a card and by a reference page's title */
.kind-badge {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--rule-2);
  border-radius: 3px;
  padding: 2px 7px;
  white-space: nowrap;
}
/* the accent is the only colour that distinguishes a kind, and only for the
   two that are structural rather than callable */
.kind-namespace, .kind-keyword { color: var(--accent); border-color: var(--accent) }

/* ---------- header ---------- */

header.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: saturate(1.4) blur(8px);
  border-bottom: 1px solid var(--rule);
}
.nav-in { display: flex; align-items: center; gap: 14px; min-height: var(--hdr) }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 18px;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none }
.logo {
  width: 23px; height: 23px;
  flex: none;
  display: grid;
  place-items: center;
  border: 1px solid var(--rule-2);
  border-radius: 4px;
  background: var(--panel);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--accent);
}

.nav-toggle {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px; height: 38px;
  border: 1px solid var(--rule-2);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--ink);
  font-size: 17px;
  line-height: 1;
  cursor: pointer;
}

.nav-links {
  display: none;
  position: absolute;
  top: 100%; left: 0; right: 0;
  flex-direction: column;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
  padding: 0 24px 8px;
}
header.nav.open .nav-links { display: flex }
.nav-links a {
  color: var(--ink-2);
  font-size: 15px;
  padding: 13px 2px;
  border-top: 1px solid var(--rule);
}
.nav-links a:first-child { border-top: none }

@media (min-width: 760px) {
  .nav-toggle { display: none }
  .nav-links {
    display: flex;
    position: static;
    flex-direction: row;
    align-items: center;
    gap: 26px;
    margin-left: auto;
    padding: 0;
    border: none;
    background: none;
  }
  .nav-links a {
    color: var(--muted);
    font-size: 14.5px;
    padding: 0;
    border: none;
  }
  .nav-links a:hover { color: var(--ink); text-decoration: none }
  .nav-links .nav-cta { color: var(--ink) }
}

/* ---------- footer ---------- */

footer {
  margin-top: 84px;
  border-top: 1px solid var(--rule);
  padding: 32px 0 44px;
}
.foot-in {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  align-items: flex-start;
  justify-content: space-between;
}
.foot-in .muted { font-size: 14px; max-width: 42ch }
.foot-links { display: flex; flex-wrap: wrap; gap: 20px }
.foot-links a { color: var(--muted); font-size: 14px }
.foot-links a:hover { color: var(--ink) }