:root {
  --bg: #0f0f11;
  --bg-elev: #16161a;
  --bg-code: #17171b;
  --rule: #24242a;
  --text: #e8e6e3;
  --text-dim: #9a988f;
  --text-faint: #6a6860;
  --accent: #f5b041;
  --accent-dim: #8a6626;
  --add: #7ab87a;
  --rem: #c96a6a;
  --mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, ui-monospace, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  font-variant-numeric: tabular-nums;
  text-rendering: optimizeLegibility;
  /* Smooth-scroll the page for anchor jumps. The h2[id] scroll-margin-top
   * already keeps targets clear of the sticky header. */
  scroll-behavior: smooth;
}

/* Respect the system "reduce motion" preference — disable smooth-scroll
 * (and any future motion) for users who've opted out at the OS level. */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0;
  padding: 0;
}

.page {
  max-width: 900px;
  margin: 0 auto;
  padding: 72px 32px 128px;
}

header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 56px;
  /* Sticky so the section nav stays reachable while scrolling. backdrop-blur
   * over a translucent --bg keeps content underneath legible. */
  position: sticky;
  top: 0;
  z-index: 10;
  padding: 14px 0;
  margin-top: -14px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(8px);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid transparent;
}

/* Once anchor-linked, the heading would otherwise scroll under the sticky
 * header — pad the scroll target so it lands below the bar. */
h2[id] {
  scroll-margin-top: 64px;
}

.brand {
  font-family: var(--mono);
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.01em;
}

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

.nav {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-dim);
  display: flex;
  gap: 20px;
}

.nav a {
  color: inherit;
}
.nav a:hover {
  color: var(--text);
}

/* External-link glyph — anything pointing off-site (http/https in the nav)
 * gets a trailing ↗ so users can tell it leaves the page before clicking. */
.nav a[href^="http"]::after {
  content: " ↗";
  font-size: 0.85em;
  color: var(--text-faint);
  margin-left: 1px;
}
.nav a[href^="http"]:hover::after {
  color: var(--text-dim);
}

/* Floating action button — pinned to the bottom-right of the viewport,
   flips contextual ligatures site-wide. Stays inside a safe-area inset
   on iOS so it doesn't collide with the home indicator. */
.fab {
  position: fixed;
  right: max(16px, env(safe-area-inset-right, 16px));
  bottom: max(16px, env(safe-area-inset-bottom, 16px));
  z-index: 10;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--text-dim);
  background: var(--bg-elev);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 8px 14px;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  transition:
    color 80ms,
    border-color 80ms,
    background 80ms;
}
.fab:hover {
  color: var(--text);
  border-color: var(--text-dim);
  background: var(--bg-code);
}
.fab[aria-pressed="true"] {
  color: var(--accent);
  border-color: var(--accent-dim);
}

/* Ligature toggle: default off (no font-variant-ligatures hint), `on` when
   html.ligatures is present. JetBrains Mono (loaded as a webfont) ships
   with contextual ligatures for `=>`, `|>`, `!=`, `..=`, etc.; the toggle
   is a no-op if the user blocks the font. */
code,
pre,
.install,
.prompt,
.brand {
  font-variant-ligatures: none;
  font-feature-settings: "calt" 0;
}
html.ligatures code,
html.ligatures pre,
html.ligatures .install,
html.ligatures .prompt,
html.ligatures .brand {
  font-variant-ligatures: contextual;
  font-feature-settings: "calt" 1;
}

h1 {
  font-size: 40px;
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 500;
  margin: 0 0 20px;
}

h1 em {
  font-style: normal;
  color: var(--accent);
}

.lede {
  font-size: 17px;
  color: var(--text-dim);
  margin: 0 0 28px;
}

h2 {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-faint);
  margin: 64px 0 20px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
}

h3 {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 500;
  margin: 28px 0 10px;
}

h3 .import {
  color: var(--accent);
}

p {
  margin: 0 0 14px;
}

a {
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  transition: border-color 120ms ease;
}
a:hover {
  border-bottom-color: var(--accent);
}

code {
  font-family: var(--mono);
  font-size: 0.92em;
  background: var(--bg-elev);
  padding: 1px 6px;
  border-radius: 3px;
  color: var(--text);
}

pre {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  background: var(--bg-code);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 16px 18px;
  margin: 12px 0 20px;
  overflow-x: auto;
  -webkit-text-size-adjust: 100%;
}

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

/* Code blocks inside <pre> are rendered through Shiki + the parabun
   TextMate grammar at build time (scripts/highlight-landing.ts) — every
   colour comes through inline `style="color:#…"` on per-token <span>s,
   so this stylesheet only owns layout. The classes below are still used
   for inline decoration in prose: `pb-kw` / `pb-op` highlight Parabun
   tokens called out in section headings, `import` italicises `bun:*`
   module names referenced in body text. */
.pure,
.pb-kw {
  color: var(--accent);
  font-weight: 500;
  font-style: italic;
}
.op,
.pb-op {
  color: var(--accent-dim);
  font-weight: 600;
}
.pb-signal-ref {
  color: var(--accent);
}

.install {
  background: var(--bg-code);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 14px 18px;
  font-family: var(--mono);
  font-size: 14px;
  color: var(--text);
  margin-bottom: 14px;
  white-space: nowrap;
  overflow-x: auto;
}
.install .prompt {
  color: var(--text-faint);
  user-select: none;
  margin-right: 10px;
}

.caveat {
  font-size: 13px;
  color: var(--text-faint);
  font-family: var(--mono);
  margin-bottom: 28px;
}

.modules h3 {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-top: 36px;
}

.modules p {
  color: var(--text-dim);
}

.diff {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 16px 0 20px;
}

.diff figure.code {
  margin: 0;
}

/* Per-block code wrapper. <figure> groups the language label
   (in <figcaption>) with the <pre> body so the two stay visually
   adjacent with no gap between them. The page-wide ligature FAB
   handles toggling, so the header is label-only. */
figure.code {
  margin: 12px 0 20px;
}
.code-header {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-faint);
  background: var(--bg-code);
  border: 1px solid var(--rule);
  border-bottom: none;
  border-top-left-radius: 6px;
  border-top-right-radius: 6px;
  padding: 6px 12px;
}
figure.code > pre {
  margin: 0;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
}
.code-lang {
  letter-spacing: 0.02em;
}

/* Tabbed code blocks — TypeScript / Parabun toggle. Same .figure.code shell;
   the lang-toggle row replaces the static .code-header. JS in fx.js syncs
   all tabs on the page (and persists choice via localStorage). */
figure.code.lang-tabs .code-header {
  display: flex;
  gap: 0;
  padding: 0;
}
figure.code.lang-tabs .lang-toggle {
  display: flex;
  width: 100%;
}
figure.code.lang-tabs .lang-toggle button {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--text-faint);
  background: transparent;
  border: none;
  padding: 6px 14px;
  cursor: pointer;
  border-right: 1px solid var(--rule);
  transition: color 80ms ease;
}
figure.code.lang-tabs .lang-toggle button:hover {
  color: var(--text);
}
figure.code.lang-tabs .lang-toggle button.active {
  color: var(--text);
  background: var(--bg-code);
  position: relative;
}
figure.code.lang-tabs .lang-toggle button.active::after {
  content: "";
  position: absolute;
  inset: auto 0 -1px 0;
  height: 1px;
  background: var(--bg-code);
}
figure.code.lang-tabs pre[hidden] {
  display: none;
}

/* Pre-paint default. Avoids a flash where both panels are visible until
   fx.js loads. The dataset.lang on <html> is set in head before paint
   (see index.html); we mirror it here to drive initial visibility. */
html[data-lang="ts"] figure.code.lang-tabs pre[data-lang="parabun"],
html[data-lang="parabun"] figure.code.lang-tabs pre[data-lang="ts"] {
  display: none;
}
html[data-lang="ts"] figure.code.lang-tabs button[data-lang="ts"],
html[data-lang="parabun"] figure.code.lang-tabs button[data-lang="parabun"] {
  color: var(--text);
  background: var(--bg-code);
}

@media (max-width: 640px) {
  .diff {
    grid-template-columns: 1fr;
  }
}

table.bench {
  width: 100%;
  border-collapse: collapse;
  margin: 14px 0 8px;
  font-family: var(--mono);
  font-size: 13px;
}

table.bench th,
table.bench td {
  padding: 8px 12px;
  text-align: left;
  border-bottom: 1px solid var(--rule);
}

table.bench th {
  color: var(--text-faint);
  font-weight: 400;
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: 0.08em;
}

table.bench td.num-cell {
  text-align: right;
  color: var(--text-dim);
}

table.bench tr.winner td {
  color: var(--text);
}
table.bench tr.winner td.num-cell {
  color: var(--accent);
}

.footnote {
  font-size: 14px;
  color: var(--text-dim);
}

.footnote code {
  background: var(--bg-code);
}

footer {
  margin-top: 96px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-faint);
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: space-between;
}

footer a {
  color: var(--text-dim);
}
footer a:hover {
  color: var(--text);
}

.disclaimer {
  margin-top: 32px;
  padding: 14px 16px;
  border-left: 2px solid var(--accent-dim);
  background: rgba(245, 176, 65, 0.04);
  font-size: 14px;
  color: var(--text-dim);
}

/* Tier diagram: hardware → primitives → composed → apps. Vertical stack
   reading bottom-up; each row has a label on the left and a flex of
   module pills on the right. */
.tiers {
  margin: 24px 0 32px;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--bg-elev);
  overflow: hidden;
}
.tier {
  display: grid;
  grid-template-columns: 160px 1fr;
  align-items: center;
  border-bottom: 1px solid var(--rule);
  padding: 14px 16px;
  gap: 16px;
}
.tier:last-child {
  border-bottom: none;
}
.tier-label {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-dim);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.tier-label em {
  display: block;
  margin-top: 3px;
  font-style: normal;
  font-size: 11px;
  color: var(--text-faint);
  text-transform: none;
  letter-spacing: 0;
}
.tier-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.tier-row .mod-pill {
  font-family: var(--mono);
  font-size: 13px;
  padding: 4px 10px;
  border-radius: 3px;
  background: var(--bg-code);
  border: 1px solid var(--rule);
  color: var(--accent);
  /* Override global a { border-bottom } and underline. */
  text-decoration: none;
  display: inline-block;
  transition:
    border-color 120ms ease,
    background-color 120ms ease;
}
a.mod-pill {
  /* Re-state at higher specificity so the global `a` rule's border-bottom
     doesn't bleed through. */
  border-bottom: 1px solid var(--rule);
}
a.mod-pill:hover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, var(--bg-code));
}
.tier-row .mod-pill.planned {
  color: var(--text-faint);
  border-style: dashed;
}
a.mod-pill.planned {
  border-bottom-style: dashed;
}
.tier-row .mod-pill.hw {
  color: var(--text-dim);
  background: transparent;
  border-style: dotted;
}
a.mod-pill.hw {
  border-bottom-style: dotted;
}
a.mod-pill.hw:hover {
  color: var(--text);
  border-color: var(--text-dim);
}
@media (max-width: 640px) {
  .tier {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

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

/* One-shot accent pulse on bench .winner rows when the table scrolls
   into view, paired with the count-up in fx.js. */
table.bench tr.winner td {
  transition: background-color 240ms ease;
}
table.bench tr.winner.pulse td {
  background-color: rgba(245, 176, 65, 0.1);
}

/* ─── Docs layout: sidebar + article column ───────────────────────────── */
.docs-body .page.docs-layout {
  max-width: 1180px;
  display: grid;
  grid-template-columns: 240px 1fr;
  grid-template-rows: auto 1fr;
  gap: 0 56px;
  padding: 72px 32px 128px;
}
.docs-body .page.docs-layout > header {
  grid-column: 1 / -1;
}
.docs-side {
  grid-column: 1;
  grid-row: 2;
  position: sticky;
  top: 88px;
  /* Stay above any default-z-index article content. Wide code blocks
     and tables sometimes establish their own stacking contexts via
     overflow: auto + scroll snapping; without an explicit z-index the
     sticky sidebar can paint behind them. */
  z-index: 2;
  align-self: start;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  font-size: 14px;
  border-right: 1px solid var(--rule);
  padding-right: 32px;
  /* Opaque background so the sticky sidebar masks article content that
     might horizontally overflow into column 1's track during a sideways
     scroll on a wide pre block. */
  background: var(--bg);
}

/* The mobile-only disclosure trigger. Hidden on desktop; the nav is
   shown directly. On mobile the toggle becomes a tap target labelled
   with the current page title, and the nav is collapsed until tapped. */
.docs-nav-toggle {
  display: none;
}
.docs-nav-panel {
  /* Default: visible on desktop. The mobile breakpoint hides this
     unless the .open class is set by the toggle script. */
  display: block;
}
.docs-side h4 {
  margin: 0 0 8px 0;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 11px;
  color: var(--text-faint);
  font-weight: 500;
}
.docs-side h4:not(:first-of-type) {
  margin-top: 24px;
}
.docs-side ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.docs-side li {
  margin: 0;
}
.docs-side a {
  display: block;
  padding: 4px 0;
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: none;
  font-family: var(--mono);
}
.docs-side a:hover {
  color: var(--text);
}
.docs-side a.active {
  color: var(--accent);
}
.docs-content {
  grid-column: 2;
  grid-row: 2;
  min-width: 0;
}
.docs-content h1 {
  margin-top: 0;
}
.docs-content > .lede {
  margin-top: -8px;
  color: var(--text-dim);
}
.docs-content h2 {
  margin-top: 56px;
  scroll-margin-top: 88px;
}
.docs-content h3 {
  margin-top: 32px;
  scroll-margin-top: 88px;
}
.docs-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}
.docs-content table th,
.docs-content table td {
  text-align: left;
  padding: 8px 12px;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}
.docs-content table th {
  color: var(--text-dim);
  font-weight: 500;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: transparent;
}
.docs-content blockquote {
  margin: 16px 0;
  padding: 12px 16px;
  border-left: 3px solid var(--accent-dim);
  background: var(--bg-elev);
  color: var(--text-dim);
  font-style: italic;
}
.docs-content blockquote code {
  font-style: normal;
}
.docs-content figure.code {
  margin: 16px 0;
}
.docs-content ul,
.docs-content ol {
  padding-left: 24px;
}
.docs-content ul li,
.docs-content ol li {
  margin: 4px 0;
}
.docs-content hr {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 32px 0;
}

@media (max-width: 880px) {
  .docs-body .page.docs-layout {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .docs-side {
    /* Drop sticky/scroll on mobile — the disclosure handles overflow
       inside an explicit panel rather than via a 40vh scroll cage. */
    position: static;
    max-height: none;
    overflow: visible;
    border-right: none;
    border-bottom: 1px solid var(--rule);
    padding-right: 0;
    padding-bottom: 8px;
    margin-bottom: 8px;
    z-index: auto;
  }
  .docs-content {
    grid-column: 1;
    /* Sidebar already occupies (1, 2) — without an explicit row override,
       the article would stack into the same cell. Row 3 lays it cleanly
       below the sidebar. */
    grid-row: 3;
  }

  /* Show the disclosure trigger; collapse the nav until the toggle opens it.
     The label is a tap-friendly mono text button — flush with the brand and
     header type to fit the rest of the chrome. */
  .docs-nav-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 10px 0;
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--rule);
    color: var(--text-dim);
    font-family: var(--mono);
    font-size: 13px;
    cursor: pointer;
    text-align: left;
    -webkit-tap-highlight-color: transparent;
  }
  .docs-nav-toggle:hover,
  .docs-nav-toggle:focus-visible {
    color: var(--text);
    outline: none;
  }
  .docs-nav-toggle-label {
    /* Long module titles can elide rather than wrap the toggle. */
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-right: 12px;
  }
  .docs-nav-toggle-caret {
    color: var(--text-faint);
    font-size: 11px;
    transition: transform 140ms ease;
    flex-shrink: 0;
  }
  .docs-nav-toggle[aria-expanded="true"] .docs-nav-toggle-caret {
    transform: rotate(180deg);
  }

  .docs-nav-panel {
    display: none;
    padding-top: 12px;
    /* Inline expand, capped so 20 modules don't push the article off-screen.
       Internal scroll keeps the article reachable without leaving the page. */
    max-height: 60vh;
    overflow-y: auto;
  }
  .docs-nav-panel.open {
    display: block;
  }
}

/* ─── Mobile (≤640px) ─────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .page,
  .docs-body .page.docs-layout {
    padding: 32px 18px 96px;
  }

  /* Stack the brand above the nav — 7 nav items don't fit beside the brand
     on a phone. Drop sticky too: a wrapped header would eat too much vertical
     space when pinned. */
  header {
    position: static;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 0;
    margin-top: 0;
    margin-bottom: 36px;
    background: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border-bottom: none;
  }
  .nav {
    flex-wrap: wrap;
    gap: 14px;
    font-size: 12px;
  }

  /* With sticky off, anchored headings can land right at the top edge. */
  h2[id],
  .docs-content h2,
  .docs-content h3 {
    scroll-margin-top: 16px;
  }

  h1 {
    font-size: 32px;
  }
  h2 {
    margin: 48px 0 16px;
  }

  /* Install commands wrap instead of forcing horizontal scroll. break-all
     is OK here — these are URLs and shell commands, not prose. */
  .install {
    white-space: normal;
    word-break: break-all;
    font-size: 13px;
    padding: 12px 14px;
  }

  pre {
    font-size: 12px;
    padding: 12px 14px;
  }

  /* Bench tables have rigid numeric columns that shouldn't wrap. Let the
     table itself scroll horizontally; display: block keeps the inner
     table semantics intact. */
  table.bench {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
    font-size: 12px;
  }
  table.bench th,
  table.bench td {
    padding: 6px 10px;
  }

  /* Docs API tables (Option / Default / Description shape): descriptions
     can wrap, so just tighten cells — no horizontal scroll needed. */
  .docs-content table {
    font-size: 13px;
  }
  .docs-content table th,
  .docs-content table td {
    padding: 6px 8px;
  }

  footer {
    margin-top: 64px;
    gap: 12px;
  }

  /* Pull the FAB tighter to the corner so it doesn't overlap the last
     content line. */
  .fab {
    right: max(10px, env(safe-area-inset-right, 10px));
    bottom: max(10px, env(safe-area-inset-bottom, 10px));
    font-size: 11px;
    padding: 6px 12px;
  }
}