/* ==========================================================================
   bits.1978.io — one stylesheet for the whole site.

   Sections:  1. tokens  2. reset  3. layout  4. masthead  5. footer
              6. hero    7. cards  8. panels/demo  9. prose (rendered README)
             10. toc    11. code   12. utilities
   ========================================================================== */

/* 1. Tokens ---------------------------------------------------------------
   Light is the default. Dark arrives either from the system preference or from
   an explicit data-theme on <html>; the explicit rule comes last so it wins. */

:root {
  --bg:          #fbfcfd;
  --bg-sunken:   #f2f5f7;
  --surface:     #ffffff;
  --surface-alt: #f7f9fa;
  --fg:          #10161c;
  --fg-muted:    #56636f;
  --fg-subtle:   #7c8894;
  --line:        #e2e7ec;
  --line-strong: #cfd7de;

  --accent:      #0d7490;
  --accent-hi:   #0a5a71;
  --accent-soft: #e6f4f8;
  --accent-line: #b6dde8;
  --on-accent:   #ffffff;

  --ok-bg:       #e7f6ec;
  --ok-fg:       #16733a;
  --no-bg:       #fdecea;
  --no-fg:       #b42318;

  --code-bg:     #f4f7f9;
  --code-line:   #e2e7ec;

  --shadow:      0 1px 2px rgba(16, 22, 28, .04), 0 8px 24px -12px rgba(16, 22, 28, .12);
  --focus:       0 0 0 2px var(--bg), 0 0 0 4px var(--accent);

  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --radius:    10px;
  --radius-sm: 6px;
  --head-h:    3.75rem;

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:          #0b1014;
    --bg-sunken:   #070b0e;
    --surface:     #111820;
    --surface-alt: #161f28;
    --fg:          #e7edf2;
    --fg-muted:    #98a5b1;
    --fg-subtle:   #74828e;
    --line:        #1e2831;
    --line-strong: #2c3843;

    --accent:      #38cfe6;
    --accent-hi:   #7fe4f2;
    --accent-soft: rgba(56, 207, 230, .10);
    --accent-line: rgba(56, 207, 230, .28);
    --on-accent:   #04222a;

    --ok-bg:       #10261a;
    --ok-fg:       #64ce88;
    --no-bg:       #2a1414;
    --no-fg:       #f0837a;

    --code-bg:     #0d141a;
    --code-line:   #1e2831;

    --shadow:      0 1px 2px rgba(0, 0, 0, .3), 0 10px 30px -14px rgba(0, 0, 0, .7);

    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg:          #0b1014;
  --bg-sunken:   #070b0e;
  --surface:     #111820;
  --surface-alt: #161f28;
  --fg:          #e7edf2;
  --fg-muted:    #98a5b1;
  --fg-subtle:   #74828e;
  --line:        #1e2831;
  --line-strong: #2c3843;

  --accent:      #38cfe6;
  --accent-hi:   #7fe4f2;
  --accent-soft: rgba(56, 207, 230, .10);
  --accent-line: rgba(56, 207, 230, .28);
  --on-accent:   #04222a;

  --ok-bg:       #10261a;
  --ok-fg:       #64ce88;
  --no-bg:       #2a1414;
  --no-fg:       #f0837a;

  --code-bg:     #0d141a;
  --code-line:   #1e2831;

  --shadow:      0 1px 2px rgba(0, 0, 0, .3), 0 10px 30px -14px rgba(0, 0, 0, .7);

  color-scheme: dark;
}

/* 2. Reset ---------------------------------------------------------------- */

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { line-height: 1.25; letter-spacing: -.015em; font-weight: 650; margin: 0; }
p { margin: 0 0 1rem; }
img, svg { max-width: 100%; }

a { color: var(--accent); text-decoration-color: color-mix(in srgb, var(--accent) 35%, transparent); text-underline-offset: 3px; }
a:hover { color: var(--accent-hi); text-decoration-color: currentColor; }

:focus-visible { outline: none; box-shadow: var(--focus); border-radius: 3px; }

.skiplink {
  position: absolute; left: -9999px; top: 0; z-index: 20;
  background: var(--accent); color: var(--on-accent);
  padding: .6rem 1rem; border-radius: 0 0 var(--radius-sm) 0; font-weight: 600;
}
.skiplink:focus { left: 0; color: var(--on-accent); }

/* 3. Layout --------------------------------------------------------------- */

.wrap  { width: min(70rem, 100% - 2.5rem); margin-inline: auto; }
.wrap--prose { width: min(46rem, 100% - 2.5rem); }

main { display: block; padding-bottom: 5rem; }

.section { padding-top: 3.25rem; scroll-margin-top: calc(var(--head-h) + .5rem); }
.section__title { font-size: 1.4rem; margin: 0 0 1rem; }

.eyebrow {
  font: 600 .72rem/1 var(--mono);
  letter-spacing: .14em; text-transform: uppercase;
  color: var(--fg-subtle); margin: 0 0 .9rem;
}

.rule { border: 0; border-top: 1px solid var(--line); margin: 3.25rem 0 0; }

/* 4. Masthead ------------------------------------------------------------- */

.masthead {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  -webkit-backdrop-filter: saturate(1.6) blur(10px);
  backdrop-filter: saturate(1.6) blur(10px);
  border-bottom: 1px solid var(--line);
}

.masthead__inner {
  min-height: var(--head-h);
  display: flex; align-items: center; gap: 1.5rem;
}

.brand {
  display: inline-flex; align-items: baseline; gap: .5rem;
  font: 700 1.05rem/1 var(--mono);
  color: var(--fg); text-decoration: none; letter-spacing: -.01em;
}
.brand:hover { color: var(--fg); }
.brand:hover .brand__mark { color: var(--accent); }

/* The mark: a 2x2 checker — little pieces, and a quiet nod to the binary. */
.brand__mark {
  width: .9rem; height: .9rem; flex: none; align-self: center;
  color: var(--fg-subtle);
  background: conic-gradient(currentColor 25%, transparent 0 50%, currentColor 0 75%, transparent 0);
  transition: color .15s ease;
}
.brand__suffix { color: var(--fg-subtle); font-weight: 400; margin-left: -.5rem; }

.nav { display: flex; gap: .25rem; margin-right: auto; }

.nav__link {
  display: inline-block; padding: .35rem .6rem; border-radius: var(--radius-sm);
  font: 500 .9rem/1.4 var(--mono);
  color: var(--fg-muted); text-decoration: none;
}
.nav__link:hover { color: var(--fg); background: var(--surface-alt); }
.nav__link.is-current { color: var(--accent); background: var(--accent-soft); }

.masthead__end { display: flex; align-items: center; gap: .4rem; }
.nav__link--ext { font-family: var(--sans); }

.themetoggle {
  display: inline-grid; place-items: center;
  width: 2.1rem; height: 2.1rem; flex: none;
  padding: 0; border: 1px solid transparent; border-radius: var(--radius-sm);
  background: none; color: var(--fg-muted); cursor: pointer;
}
.themetoggle:hover { color: var(--fg); background: var(--surface-alt); border-color: var(--line); }
.themetoggle svg {
  grid-area: 1 / 1; width: 1.1rem; height: 1.1rem;
  fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round;
}
.themetoggle__moon { display: none; }
:root[data-theme="dark"] .themetoggle__sun,
:root[data-theme="light"] .themetoggle__moon { display: none; }
:root[data-theme="dark"] .themetoggle__moon,
:root[data-theme="light"] .themetoggle__sun { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .themetoggle__sun { display: none; }
  :root:not([data-theme="light"]) .themetoggle__moon { display: block; }
}

@media (max-width: 34rem) {
  .masthead__inner { gap: .75rem; }
  .brand__suffix, .nav__link--ext { display: none; }
}

/* 5. Footer --------------------------------------------------------------- */

.sitefoot { border-top: 1px solid var(--line); background: var(--bg-sunken); }

.sitefoot__inner {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 1rem 2rem; padding: 2rem 0;
  font-size: .875rem; color: var(--fg-muted);
}
.sitefoot__left { margin: 0; display: flex; align-items: baseline; gap: .75rem; }
.sitefoot__mark { font: 700 .95rem/1 var(--mono); color: var(--fg); }

.sitefoot__links { display: flex; flex-wrap: wrap; gap: 1.25rem; }
.sitefoot__links a { color: var(--fg-muted); text-decoration: none; }
.sitefoot__links a:hover { color: var(--accent); text-decoration: underline; }
.sitefoot__parent { color: var(--fg-subtle); font-style: italic; }

/* 6. Hero ----------------------------------------------------------------- */

.hero { padding: 4.5rem 0 0; }
.hero--home { padding-bottom: .5rem; }

.hero__title {
  font-size: clamp(2rem, 1.4rem + 2.4vw, 3rem);
  margin: 0 0 .75rem;
}
.hero__title code, .hero__title .mono { font: inherit; font-family: var(--mono); background: none; padding: 0; }
.hero__title .dim { color: var(--fg-subtle); font-weight: 400; }

.hero__lede {
  font-size: 1.15rem; line-height: 1.6; color: var(--fg-muted);
  max-width: 40rem; margin: 0 0 1.5rem;
}
.hero__lede strong { color: var(--fg); font-weight: 600; }

.hero__meta { display: flex; flex-wrap: wrap; align-items: center; gap: .75rem 1.25rem; }

.taglist { display: flex; flex-wrap: wrap; gap: .4rem; margin: 0; padding: 0; list-style: none; }
.tag {
  font: 500 .74rem/1 var(--mono);
  color: var(--fg-muted); background: var(--surface-alt);
  border: 1px solid var(--line); border-radius: 999px; padding: .35rem .65rem;
  white-space: nowrap;
}

.btnrow { display: flex; flex-wrap: wrap; gap: .6rem; }

.btn {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .5rem .95rem; border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong); background: var(--surface); color: var(--fg);
  font: 500 .9rem/1.4 var(--sans); text-decoration: none; cursor: pointer;
}
.btn:hover { color: var(--accent); border-color: var(--accent-line); background: var(--accent-soft); }
.btn--primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.btn--primary:hover { background: var(--accent-hi); border-color: var(--accent-hi); color: var(--on-accent); }

/* 7. Tool cards ----------------------------------------------------------- */

.cards {
  display: grid; gap: 1.25rem; margin: 0; padding: 0; list-style: none;
  grid-template-columns: repeat(auto-fit, minmax(19rem, 1fr));
}

.card {
  position: relative; display: flex; flex-direction: column;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.5rem 1.5rem 1.35rem;
  transition: border-color .15s ease, transform .15s ease, box-shadow .15s ease;
}
.card:hover { border-color: var(--accent-line); transform: translateY(-2px); box-shadow: var(--shadow); }

.card__head { display: flex; align-items: baseline; gap: .6rem; margin-bottom: .5rem; }
.card__name { font: 700 1.25rem/1.2 var(--mono); letter-spacing: -.02em; }
.card__name a { color: var(--fg); text-decoration: none; }
.card__name a::after { content: ""; position: absolute; inset: 0; border-radius: var(--radius); }
.card:hover .card__name a { color: var(--accent); }
.card__lang { font: 500 .72rem/1 var(--mono); color: var(--fg-subtle); letter-spacing: .06em; text-transform: uppercase; }

.card__blurb { color: var(--fg-muted); margin: 0 0 1.1rem; }
.card__tags { margin-top: auto; padding-top: .25rem; }
.card__foot { margin-top: 1.1rem; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .5rem 1rem; }
.card__go { font: 500 .85rem/1 var(--sans); color: var(--accent); }
.card:hover .card__go { color: var(--accent-hi); }

.card--ghost {
  border-style: dashed; background: none; justify-content: center;
  color: var(--fg-subtle); font-size: .9rem;
}
.card--ghost:hover { transform: none; box-shadow: none; border-color: var(--line-strong); }
.card--ghost p { margin: 0; }

/* 8. Panels + the live demos ---------------------------------------------- */

.panel {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.5rem;
}
.panel__title { font-size: .95rem; margin: 0 0 .35rem; }
.panel__note { color: var(--fg-muted); font-size: .9rem; margin: 0 0 1.1rem; }
.panel__note:last-child { margin-bottom: 0; }

.demo { border-color: var(--accent-line); }
.demo__live {
  display: inline-flex; align-items: center; gap: .45rem;
  font: 600 .7rem/1 var(--mono); letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent);
}
.demo__live::before {
  content: ""; width: .45rem; height: .45rem; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft);
}

/* Scry verdict */
.verdict { display: flex; flex-wrap: wrap; align-items: center; gap: .9rem; margin: 1.1rem 0 1.25rem; }
.verdict__label { font: 650 1.6rem/1.2 var(--sans); letter-spacing: -.02em; margin: 0; }
.pill {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .3rem .75rem; border-radius: 999px;
  font: 500 .82rem/1.4 var(--sans);
}
.pill--yes { background: var(--ok-bg); color: var(--ok-fg); }
.pill--no  { background: var(--no-bg); color: var(--no-fg); }

/* A field table that reads like the API it mirrors. */
.fields { width: 100%; border-collapse: collapse; font-size: .9rem; }
.fields th, .fields td { text-align: left; padding: .5rem .5rem .5rem 0; border-bottom: 1px solid var(--line); vertical-align: top; }
.fields tr:last-child th, .fields tr:last-child td { border-bottom: 0; }
.fields th { font: 400 .875rem/1.5 var(--mono); color: var(--fg-muted); width: 10.5rem; }
.fields td { font-family: var(--mono); }
.fields .v-true  { color: var(--ok-fg); }
.fields .v-false { color: var(--fg-subtle); }

.rawua {
  margin: 1.25rem 0 0; padding: .8rem 1rem;
  background: var(--code-bg); border: 1px solid var(--code-line); border-radius: var(--radius-sm);
  font: .8rem/1.6 var(--mono); color: var(--fg-muted); word-break: break-all;
}
.rawua b { display: block; font: 600 .7rem/1 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--fg-subtle); margin-bottom: .5rem; }

/* trace switch + log */
.switchrow { display: flex; flex-wrap: wrap; align-items: center; gap: .75rem 1rem; }
.switchrow input { width: 1.1rem; height: 1.1rem; margin: 0; accent-color: var(--accent); cursor: pointer; }
.switchrow label { font-weight: 600; cursor: pointer; }
.switchrow .state { font: .82rem/1 var(--mono); color: var(--fg-muted); }
.switchrow .state b { color: var(--fg); }

.buttonrow { display: flex; flex-wrap: wrap; gap: .5rem; margin: 1.1rem 0 0; }
.buttonrow .btn { font-family: var(--mono); font-size: .82rem; }

.console {
  margin-top: 1.1rem; padding: .85rem 1rem;
  background: var(--code-bg); border: 1px solid var(--code-line); border-radius: var(--radius-sm);
  font: .82rem/1.7 var(--mono);
  min-height: 7.5rem; max-height: 16rem; overflow: auto; white-space: pre-wrap; word-break: break-word;
}
.console .empty { color: var(--fg-subtle); }
.console .name { color: var(--accent); font-weight: 600; }
.console .pre { color: var(--fg-subtle); }

/* 9. Prose — the rendered README ------------------------------------------ */

.prose { max-width: 44rem; }
.prose > :first-child { margin-top: 0; }

.prose h2 {
  font-size: 1.4rem; margin: 3rem 0 .85rem; padding-top: .35rem;
  scroll-margin-top: calc(var(--head-h) + 1.5rem);
}
.prose h3 {
  font-size: 1.08rem; margin: 2.25rem 0 .6rem;
  scroll-margin-top: calc(var(--head-h) + 1.5rem);
}
.prose h4 { font-size: .95rem; margin: 1.75rem 0 .5rem; color: var(--fg-muted); }

.prose p, .prose li { color: var(--fg-muted); }
.prose strong { color: var(--fg); font-weight: 600; }
.prose ul, .prose ol { margin: 0 0 1rem; padding-left: 1.35rem; }
.prose li { margin: .3rem 0; }
.prose li > p { margin: .25rem 0; }

.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2.5rem 0; }

.prose blockquote {
  margin: 1.25rem 0; padding: .1rem 0 .1rem 1.1rem;
  border-left: 3px solid var(--accent-line); color: var(--fg-muted);
}

.prose table {
  width: 100%; border-collapse: collapse; margin: 1.25rem 0; font-size: .9rem;
  display: block; overflow-x: auto;
}
.prose thead th {
  text-align: left; font: 600 .74rem/1.4 var(--mono); letter-spacing: .06em; text-transform: uppercase;
  color: var(--fg-subtle); padding: .5rem .85rem .5rem 0; border-bottom: 1px solid var(--line-strong);
  white-space: nowrap;
}
/* Some README tables use an empty header row purely for layout — don't draw it. */
.prose thead tr:not(:has(th:not(:empty))) { display: none; }
.prose tbody td { padding: .55rem .85rem .55rem 0; border-bottom: 1px solid var(--line); color: var(--fg-muted); vertical-align: top; }
.prose tbody tr:last-child td { border-bottom: 0; }
.prose tbody td:first-child { color: var(--fg); }

/* 10. Table of contents --------------------------------------------------- */

.docs { display: grid; gap: 3rem; align-items: start; }

/* Grid items default to min-width:auto, which lets a long unwrapped line inside a
   <pre> push the whole column — and the page — wider than the viewport. */
.docs > *, .installs > * { min-width: 0; }

@media (min-width: 62rem) {
  .docs { grid-template-columns: minmax(0, 1fr) 13rem; }
  .toc { position: sticky; top: calc(var(--head-h) + 2rem); }
}

.toc { font-size: .875rem; }
.toc__title { font: 600 .7rem/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--fg-subtle); margin: 0 0 .75rem; }
.toc ul { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--line); }
.toc li { margin: 0; }
.toc a {
  display: block; padding: .3rem 0 .3rem .85rem; margin-left: -1px;
  border-left: 1px solid transparent;
  color: var(--fg-muted); text-decoration: none;
}
.toc a:hover { color: var(--accent); border-left-color: var(--accent-line); }

@media (max-width: 61.99rem) {
  .toc { order: -1; padding: 1rem 1.25rem; background: var(--surface-alt); border: 1px solid var(--line); border-radius: var(--radius); }
  .toc ul { columns: 2; column-gap: 1.5rem; border-left: 0; }
  .toc a { padding-left: 0; border-left: 0; }
}

/* 11. Code ---------------------------------------------------------------- */

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

:where(p, li, td, th, h1, h2, h3, h4, .panel__note) > code {
  font-size: .875em; padding: .12em .38em; border-radius: 4px;
  background: var(--code-bg); border: 1px solid var(--code-line);
  color: var(--fg);
  word-break: break-word;
}

pre {
  margin: 0; padding: .95rem 1.1rem; overflow-x: auto;
  background: var(--code-bg); border: 1px solid var(--code-line); border-radius: var(--radius-sm);
  font-size: .84rem; line-height: 1.7; tab-size: 2;
}
pre code { background: none; border: 0; padding: 0; font-size: inherit; color: var(--fg); }

.prose pre { margin: 1.1rem 0; }

/* The copy button is added by site.js, which wraps each <pre> in .codeblock. */
.codeblock { position: relative; }
.codeblock__copy {
  position: absolute; top: .5rem; right: .5rem;
  padding: .25rem .5rem; border-radius: 4px;
  border: 1px solid var(--line); background: var(--surface); color: var(--fg-muted);
  font: 500 .7rem/1.4 var(--sans); cursor: pointer;
  opacity: 0; transition: opacity .12s ease;
}
.codeblock:hover .codeblock__copy,
.codeblock__copy:focus-visible { opacity: 1; }
.codeblock__copy:hover { color: var(--accent); border-color: var(--accent-line); }
.codeblock__copy.is-done { color: var(--ok-fg); border-color: var(--ok-fg); opacity: 1; }

@media (hover: none) { .codeblock__copy { opacity: 1; } }

/* An install block: a small label above a command. */
.installs { display: grid; gap: 1.1rem; }
.install__label { font: 600 .72rem/1 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--fg-subtle); margin: 0 0 .5rem; }
.install__note { font-size: .875rem; color: var(--fg-muted); margin: .5rem 0 0; }

@media (min-width: 48rem) {
  .installs--split { grid-template-columns: 1fr 1fr; gap: 1.5rem; }
}

/* 12. Utilities ----------------------------------------------------------- */

.mono { font-family: var(--mono); }
.muted { color: var(--fg-muted); }
.lead { font-size: 1.05rem; color: var(--fg-muted); max-width: 44rem; }
.stack > * + * { margin-top: 1.25rem; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}