/* ─── Stellar Atlas: dark (Night Sky, default) + light (Atlas) ─────────
   Para and ParaBun are a binary star system. The site reflects
   that — dark mode is "observation": deep midnight bg with the binary
   pair as the accent system. Light mode is "atlas": parchment paper,
   ink markings, the same binary expressed as deep blue + vermillion.
   Theme resolution shared via localStorage["starlight-theme"]. */
:root,
:root[data-theme="dark"] {
  --bg: #050811;
  --bg-elev: #0c1020;
  --bg-code: #0d1224;
  --rule: #1a2240;
  --rule-strong: #2a3458;
  --text: #e8e6dd;
  --text-dim: #8a8b94;
  --text-faint: #4a4d5a;
  /* Stellar-spectrum trinity. Each section landing picks its own
     accent below via body.page-libs / .page-lang / .page-runtime so
     /libs reads as blue, /lang as yellow, /runtime as red — matching
     the umbrella splash cards. The default (when no body class is
     set, e.g. on /docs/) is blue, since the libraries are the
     broadest-audience product. */
  --star-lib: #6db4ff;
  --star-lang: #ffd54a;
  --star-runtime: #ff5c4a;
  /* Default accent (no section class) = blue. */
  --accent: var(--star-lib);
  --accent-dim: #9fcdff;
  --accent-soft: #1a2a44;
  --add: #6dd49a;
  --rem: #ff7a7a;
  --shadow-strong: rgba(0, 0, 0, 0.6);
  --mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, ui-monospace, monospace;
  --sans: "Spectral", Georgia, "Times New Roman", serif;
  --serif: "Fraunces", Georgia, "Times New Roman", serif;
}

:root[data-theme="light"] {
  --bg: #f3efe3;
  --bg-elev: #f8f5ec;
  --bg-code: #ebe5d4;
  --rule: #d4cdba;
  --rule-strong: #b8af9a;
  --text: #1a1812;
  --text-dim: #5e574a;
  --text-faint: #94897a;
  --star-lib: #1a4880;
  --star-lang: #a07a18;
  --star-runtime: #b94a1f;
  --accent: var(--star-lib);
  --accent-dim: #6db4ff;
  --accent-soft: #d8e4f4;
  --add: #4d7c4f;
  --rem: #b94a1f;
  --shadow-strong: rgba(26, 24, 18, 0.1);
}

/* Per-section palette overrides — body class is set on each landing
   page (/libs/index.html → page-libs, /lang/ → page-lang). Each
   tints the entire palette toward the section's trinity color, not
   just the accent. Lifted to :root:has(body.X) so var resolution at
   the html element (which paints the page background) sees them. */
:root:has(body.page-libs) {
  --accent: var(--star-lib);
  --accent-dim: #9fcdff;
  --accent-soft: #1a2a44;
  /* Defaults are already blue-tinted (cool dark + neutral text). */
}
:root:has(body.page-lang) {
  --bg: #0a0905;
  --bg-elev: #100e08;
  --bg-code: #14110a;
  --rule: #2a2614;
  --rule-strong: #3d3722;
  --text: #f0ecd8;
  --text-dim: #a89e80;
  --text-faint: #5c5538;
  --accent: var(--star-lang);
  --accent-dim: #ffe88a;
  --accent-soft: #2a230a;
}
:root[data-theme="light"] body.page-libs {
  --accent: var(--star-lib);
  --accent-dim: #6db4ff;
  --accent-soft: #d8e4f4;
}
:root[data-theme="light"] body.page-lang {
  --accent: var(--star-lang);
  --accent-dim: #d4a830;
  --accent-soft: #f4ecd0;
}

* {
  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;
  position: relative;
}

/* ─── Atmospheric backgrounds — three parallax layers ─────────────────
   Three pseudo-elements at different depths, drifting at different
   rates as you scroll. Painted in tree order so html::before is the
   deepest layer (drawn first), body::after is the shallowest.

   Layer 1 (html::before, deepest): soft nebulae backdrop, slowest
   parallax. The "galactic gas" the rest of the scene sits inside.
   Layer 2 (body::before, middle): the dense starfield — distant + mid
   stars with halos. Most of the visible star content lives here.
   Layer 3 (body::after, closest): a handful of very bright foreground
   stars with strong glows + small near-dust nebulae. Moves the most
   on scroll, sells the depth.

   Light mode swaps to a parchment dot-grid on body::before only;
   html::before / body::after sit empty (no atmosphere in atlas mode). */

html::before,
body::before,
body::after {
  content: "";
  position: fixed;
  /* Extend 60vh below viewport so when the layer translates up to
     -38vh (max parallax) there's still content covering the bottom of
     the viewport. Without this, scrolling reveals an empty band. */
  inset: 0 0 -60vh 0;
  pointer-events: none;
  will-change: transform;
  transform: translate3d(0, 0, 0);
}

/* ─── Layer 1: deep nebulae (html::before) ──────────────────────────── */
:root[data-theme="dark"]::before,
:root:not([data-theme="light"])::before {
  z-index: 0;
  background-image:
    radial-gradient(ellipse 80vw 65vh at 78% 18%, rgba(109, 180, 255, 0.13), transparent 65%),
    radial-gradient(ellipse 65vw 50vh at 12% 75%, rgba(109, 180, 255, 0.08), transparent 65%),
    radial-gradient(ellipse 55vw 60vh at 55% 110%, rgba(109, 180, 255, 0.05), transparent 60%);
  animation: layer-deep linear;
  animation-timeline: scroll(root);
}

/* ─── Layer 2: dense starfield (body::before) ───────────────────────── */
:root[data-theme="dark"] body::before,
:root:not([data-theme="light"]) body::before {
  z-index: 0;
  background-image:
    /* Medium stars with halos — three-stop gradient: solid core, diffuse
       falloff, transparent outer. */
    radial-gradient(2px 2px at 8% 18%, rgba(255, 255, 255, 0.85) 25%, rgba(255, 255, 255, 0.18) 55%, transparent 100%),
    radial-gradient(2px 2px at 23% 76%, rgba(255, 255, 255, 0.8) 25%, rgba(255, 255, 255, 0.15) 55%, transparent 100%),
    radial-gradient(2px 2px at 67% 12%, rgba(255, 255, 255, 0.85) 25%, rgba(255, 255, 255, 0.18) 55%, transparent 100%),
    radial-gradient(2px 2px at 23% 22%, rgba(255, 255, 255, 0.8) 25%, rgba(255, 255, 255, 0.15) 55%, transparent 100%),
    radial-gradient(2px 2px at 49% 53%, rgba(180, 210, 255, 0.85) 25%, rgba(109, 180, 255, 0.18) 55%, transparent 100%),
    radial-gradient(2px 2px at 38% 4%, rgba(255, 255, 255, 0.75) 25%, rgba(255, 255, 255, 0.14) 55%, transparent 100%),
    /* Dim pinpricks — single-stop, no halo, just a dot. */
      radial-gradient(1px 1px at 14% 52%, rgba(255, 255, 255, 0.55) 50%, transparent 100%),
    radial-gradient(1px 1px at 35% 7%, rgba(255, 255, 255, 0.45) 50%, transparent 100%),
    radial-gradient(1px 1px at 49% 88%, rgba(255, 255, 255, 0.5) 50%, transparent 100%),
    radial-gradient(1px 1px at 73% 53%, rgba(255, 255, 255, 0.45) 50%, transparent 100%),
    radial-gradient(1px 1px at 18% 38%, rgba(255, 255, 255, 0.4) 50%, transparent 100%),
    radial-gradient(1px 1px at 31% 65%, rgba(255, 255, 255, 0.5) 50%, transparent 100%),
    radial-gradient(1px 1px at 47% 28%, rgba(255, 255, 255, 0.45) 50%, transparent 100%),
    radial-gradient(1px 1px at 58% 82%, rgba(255, 255, 255, 0.4) 50%, transparent 100%),
    radial-gradient(1px 1px at 64% 38%, rgba(255, 255, 255, 0.5) 50%, transparent 100%),
    radial-gradient(1px 1px at 76% 18%, rgba(255, 255, 255, 0.45) 50%, transparent 100%),
    radial-gradient(1px 1px at 84% 62%, rgba(255, 255, 255, 0.4) 50%, transparent 100%),
    radial-gradient(1px 1px at 95% 28%, rgba(255, 255, 255, 0.5) 50%, transparent 100%),
    radial-gradient(1px 1px at 4% 84%, rgba(255, 255, 255, 0.4) 50%, transparent 100%),
    radial-gradient(1px 1px at 28% 92%, rgba(255, 255, 255, 0.45) 50%, transparent 100%),
    radial-gradient(1px 1px at 41% 18%, rgba(109, 180, 255, 0.5) 50%, transparent 100%),
    radial-gradient(1px 1px at 87% 8%, rgba(159, 205, 255, 0.4) 50%, transparent 100%),
    radial-gradient(1px 1px at 12% 5%, rgba(255, 255, 255, 0.4) 50%, transparent 100%),
    radial-gradient(1px 1px at 52% 96%, rgba(255, 255, 255, 0.4) 50%, transparent 100%);
  /* Match the extended layer height so percent-based star positions
     distribute across the full pseudo, not just the top viewport-sized
     region. */
  background-size: 100vw 160vh;
  animation: layer-mid linear;
  animation-timeline: scroll(root);
}

/* ─── Layer 3: foreground bright stars + near-dust (body::after) ─────── */
:root[data-theme="dark"] body::after,
:root:not([data-theme="light"]) body::after {
  z-index: 0;
  background-image:
    /* Big bright stars with strong halos — these are the "near" stars,
       sell the depth as you scroll past them. Lead-color first. */
    radial-gradient(3px 3px at 88% 38%, rgba(180, 210, 255, 1) 16%, rgba(109, 180, 255, 0.45) 38%, transparent 90%),
    radial-gradient(4px 4px at 41% 31%, rgba(255, 255, 255, 1) 14%, rgba(255, 255, 255, 0.35) 38%, transparent 90%),
    radial-gradient(3px 3px at 14% 78%, rgba(200, 220, 255, 0.95) 16%, rgba(109, 180, 255, 0.35) 38%, transparent 90%),
    radial-gradient(3px 3px at 71% 88%, rgba(255, 255, 255, 0.95) 16%, rgba(255, 255, 255, 0.3) 38%, transparent 90%),
    /* Tight foreground dust — small, slightly more opaque than the deep
       nebulae layer. */
      radial-gradient(ellipse 35vw 28vh at 85% 8%, rgba(109, 180, 255, 0.06), transparent 70%),
    radial-gradient(ellipse 30vw 25vh at 15% 92%, rgba(109, 180, 255, 0.05), transparent 70%);
  animation: layer-near linear;
  animation-timeline: scroll(root);
}

/* ─── Light mode: parchment dot-grid only on body::before ───────────── */
:root[data-theme="light"] body::before {
  z-index: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(26, 24, 18, 0.08) 1px, transparent 1px);
  background-size: 24px 24px;
}
:root[data-theme="light"]::before,
:root[data-theme="light"] body::after {
  display: none;
}

/* ─── /lang section overrides — yellow-tinted parallax layers ─────────
   The default Layer 1-3 gradients above are blue + amber-led (built
   for /libs). On the lang landing we repaint them in yellow so the
   ambient color matches the section's accent. Selectors include
   :has(body.page-lang) so they win over the default. */
:root:has(body.page-lang)::before {
  background-image:
    radial-gradient(ellipse 80vw 65vh at 78% 18%, rgba(255, 213, 74, 0.12), transparent 65%),
    radial-gradient(ellipse 65vw 50vh at 12% 75%, rgba(255, 180, 80, 0.08), transparent 65%),
    radial-gradient(ellipse 55vw 60vh at 55% 110%, rgba(220, 170, 60, 0.06), transparent 60%);
}
:root:has(body.page-lang) body::before {
  /* Repaint the dense starfield with a yellow accent instead of the
     blue accent on line 178 + the blue/amber pinpricks at 195-196. */
  background-image:
    radial-gradient(2px 2px at 8% 18%, rgba(255, 255, 255, 0.85) 25%, rgba(255, 255, 255, 0.18) 55%, transparent 100%),
    radial-gradient(2px 2px at 23% 76%, rgba(255, 255, 255, 0.8) 25%, rgba(255, 255, 255, 0.15) 55%, transparent 100%),
    radial-gradient(2px 2px at 67% 12%, rgba(255, 255, 255, 0.85) 25%, rgba(255, 255, 255, 0.18) 55%, transparent 100%),
    radial-gradient(2px 2px at 23% 22%, rgba(255, 255, 255, 0.8) 25%, rgba(255, 255, 255, 0.15) 55%, transparent 100%),
    radial-gradient(2px 2px at 49% 53%, rgba(255, 235, 180, 0.85) 25%, rgba(255, 213, 74, 0.18) 55%, transparent 100%),
    radial-gradient(2px 2px at 38% 4%, rgba(255, 255, 255, 0.75) 25%, rgba(255, 255, 255, 0.14) 55%, transparent 100%),
    radial-gradient(1px 1px at 14% 52%, rgba(255, 255, 255, 0.55) 50%, transparent 100%),
    radial-gradient(1px 1px at 35% 7%, rgba(255, 255, 255, 0.45) 50%, transparent 100%),
    radial-gradient(1px 1px at 49% 88%, rgba(255, 255, 255, 0.5) 50%, transparent 100%),
    radial-gradient(1px 1px at 73% 53%, rgba(255, 255, 255, 0.45) 50%, transparent 100%),
    radial-gradient(1px 1px at 18% 38%, rgba(255, 255, 255, 0.4) 50%, transparent 100%),
    radial-gradient(1px 1px at 31% 65%, rgba(255, 255, 255, 0.5) 50%, transparent 100%),
    radial-gradient(1px 1px at 47% 28%, rgba(255, 255, 255, 0.45) 50%, transparent 100%),
    radial-gradient(1px 1px at 58% 82%, rgba(255, 255, 255, 0.4) 50%, transparent 100%),
    radial-gradient(1px 1px at 64% 38%, rgba(255, 255, 255, 0.5) 50%, transparent 100%),
    radial-gradient(1px 1px at 76% 18%, rgba(255, 255, 255, 0.45) 50%, transparent 100%),
    radial-gradient(1px 1px at 84% 62%, rgba(255, 255, 255, 0.4) 50%, transparent 100%),
    radial-gradient(1px 1px at 95% 28%, rgba(255, 255, 255, 0.5) 50%, transparent 100%),
    radial-gradient(1px 1px at 4% 84%, rgba(255, 255, 255, 0.4) 50%, transparent 100%),
    radial-gradient(1px 1px at 28% 92%, rgba(255, 255, 255, 0.45) 50%, transparent 100%),
    radial-gradient(1px 1px at 41% 18%, rgba(255, 213, 74, 0.5) 50%, transparent 100%),
    radial-gradient(1px 1px at 87% 8%, rgba(255, 200, 100, 0.4) 50%, transparent 100%),
    radial-gradient(1px 1px at 12% 5%, rgba(255, 255, 255, 0.4) 50%, transparent 100%),
    radial-gradient(1px 1px at 52% 96%, rgba(255, 255, 255, 0.4) 50%, transparent 100%);
  background-size: 100vw 160vh;
}
:root:has(body.page-lang) body::after {
  background-image:
    radial-gradient(3px 3px at 88% 38%, rgba(255, 235, 180, 1) 16%, rgba(255, 213, 74, 0.45) 38%, transparent 90%),
    radial-gradient(4px 4px at 41% 31%, rgba(255, 255, 255, 1) 14%, rgba(255, 255, 255, 0.35) 38%, transparent 90%),
    radial-gradient(3px 3px at 14% 78%, rgba(255, 230, 160, 0.95) 16%, rgba(255, 200, 100, 0.35) 38%, transparent 90%),
    radial-gradient(3px 3px at 71% 88%, rgba(255, 255, 255, 0.95) 16%, rgba(255, 255, 255, 0.3) 38%, transparent 90%),
    radial-gradient(ellipse 35vw 28vh at 85% 8%, rgba(255, 213, 74, 0.07), transparent 70%),
    radial-gradient(ellipse 30vw 25vh at 15% 92%, rgba(255, 200, 100, 0.05), transparent 70%);
}

/* ─── Parallax keyframes — slowest deepest, fastest closest ─────────── */
@keyframes layer-deep {
  to {
    transform: translate3d(0, -6vh, 0);
  }
}
@keyframes layer-mid {
  to {
    transform: translate3d(0, -22vh, 0);
  }
}
@keyframes layer-near {
  to {
    transform: translate3d(0, -38vh, 0);
  }
}

/* Lift content above the atmosphere layer. */
.page,
header {
  position: relative;
  z-index: 1;
}

/* ─── Binary star brand mark ──────────────────────────────────────────
   Two circles orbiting a shared barycenter. transform-box: view-box
   makes transform-origin reference the SVG's viewport coords (otherwise
   it'd be relative to each circle's bounding box, which would have it
   spin in place). 50% 50% = (16, 16) = center of viewBox = barycenter.

   Both stars share the same `orbit` animation so they keep the same
   angular velocity — the line between them is always a diameter. The
   primary's smaller orbital radius (5 vs companion's 11) reflects the
   real binary-star mass relationship: heavier body orbits less.

   Twinkle is a second animation on opacity, running at a different
   period per star, so the two shimmer asynchronously like real
   eclipsing-binary photometric variability. */
.binary {
  display: inline-block;
  width: 32px;
  height: 32px;
  vertical-align: -10px;
  margin-right: 10px;
  /* drop-shadow on the spinning circles extends past the viewBox; let
     it paint into the adjacent flex gap rather than clipping at the
     SVG box. SVG defaults to overflow:hidden which crops the glow. */
  overflow: visible;
}
/* Canvas-rendered 3-body sim that's now used in the nav badge. Same
   footprint as .binary above; see /nav-3body.js for the integrator. */
.nav-3body {
  display: inline-block;
  width: 32px;
  height: 32px;
  vertical-align: -10px;
  margin-right: 10px;
}
.binary circle {
  transform-box: view-box;
  transform-origin: 50% 50%;
}
.binary .star-a {
  fill: var(--star-lib);
  /* Single drop-shadow — two stacked drop-shadow filters look richer
     but each one re-runs every animation frame on the rotating star
     and spikes the main thread. One wider shadow is the perf compromise. */
  filter: drop-shadow(0 0 4px var(--star-lib));
  animation:
    orbit 14s linear infinite,
    twinkle-a 4.2s ease-in-out infinite;
}
.binary .star-b {
  fill: var(--star-runtime);
  filter: drop-shadow(0 0 4px var(--star-runtime));
  animation:
    orbit 14s linear infinite,
    twinkle-b 5.7s ease-in-out infinite;
}
@keyframes orbit {
  to {
    transform: rotate(360deg);
  }
}
@keyframes twinkle-a {
  0%,
  100% {
    opacity: 1;
  }
  45% {
    opacity: 0.78;
  }
}
@keyframes twinkle-b {
  0%,
  100% {
    opacity: 1;
  }
  60% {
    opacity: 0.7;
  }
}
@media (prefers-reduced-motion: reduce) {
  .binary .star-a,
  .binary .star-b {
    animation: none;
  }
}

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

header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  margin-top: 14px;
  margin-bottom: 56px;
  /* Floating pill: insets from the .page edges + 14px corners + glass
     blur. backdrop-filter is back here because the surface is smaller
     than full-viewport and the nebulae underneath are on a GPU layer,
     so the per-frame rasterization cost stays bounded. */
  position: sticky;
  top: 14px;
  z-index: 10;
  padding: 14px;
  background: color-mix(in srgb, var(--bg) 55%, transparent);
  backdrop-filter: blur(10px) saturate(150%);
  -webkit-backdrop-filter: blur(10px) saturate(150%);
  border: 1px solid var(--rule);
  border-radius: 14px;
}

/* 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 {
  display: inline-flex;
  align-items: center;
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.018em;
  color: var(--text);
  font-variation-settings:
    "opsz" 144,
    "SOFT" 30;
}

/* Dual brand: "Para / ParaBun" with the active site emphasized.
   Inactive name links to the other subdomain — doubles as the cross-
   brand cue and a back-to-pair navigation. */
.brand-pair {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4ch;
}
.brand-active {
  color: var(--text);
  font-weight: 700;
}
.brand-sep {
  color: var(--text-faint);
  font-weight: 300;
  font-style: italic;
}
.brand-link {
  color: var(--text-faint);
  font-weight: 400;
  text-decoration: none;
  border-bottom: none;
  transition: color 160ms ease;
}
.brand-link:hover,
.brand-link:focus-visible {
  color: var(--accent);
  outline: none;
}

/* Desktop: <details class="nav-dropdown"> is transparent (display:
   contents) and the summary hidden, so the nav reads as the same
   inline link list as before. The mobile @media block below makes
   the details a real block + the summary into a hamburger button. */
.nav-dropdown {
  display: contents;
}
.nav-toggle {
  display: none;
  list-style: none;
}
.nav-toggle::-webkit-details-marker {
  display: none;
}

.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 2px 12px var(--shadow-strong);
  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-family: var(--serif);
  font-size: clamp(2.6rem, 1.9rem + 2.8vw, 4.2rem);
  line-height: 1.04;
  letter-spacing: -0.022em;
  font-weight: 600;
  margin: 0 0 24px;
  color: var(--text);
  font-variation-settings:
    "opsz" 144,
    "SOFT" 30;
}

h1 em {
  font-style: italic;
  font-weight: 400;
  color: var(--accent);
  font-variation-settings:
    "opsz" 144,
    "SOFT" 50;
}

.lede {
  font-family: var(--serif);
  font-size: 1.32rem;
  font-weight: 400;
  font-style: italic;
  line-height: 1.45;
  letter-spacing: -0.005em;
  color: var(--text-dim);
  margin: 0 0 28px;
  max-width: 38em;
  font-variation-settings:
    "opsz" 36,
    "SOFT" 50;
}

/* Lib + Lang side by side on wide screens, stacked on narrow. Each
   keeps its own column border so the structural separation is visible
   at a glance. */
.pieces {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  margin: 0 0 40px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.piece {
  padding: 28px 24px;
  border-right: 1px solid var(--rule);
}
.piece:last-child {
  border-right: none;
}
.piece h3 {
  margin-top: 0;
  font-size: 1.18rem;
}
.piece p {
  font-size: 0.96rem;
  line-height: 1.55;
  color: var(--text-dim);
}
.piece p:last-child {
  margin-bottom: 0;
}
.piece a {
  color: var(--accent);
  border-bottom: 1px dotted var(--accent-dim);
  text-decoration: none;
}
@media (max-width: 900px) {
  .pieces {
    grid-template-columns: 1fr;
  }
  .piece {
    border-right: none;
    border-bottom: 1px solid var(--rule);
  }
  .piece:last-child {
    border-bottom: none;
  }
}

h2 {
  font-family: var(--serif);
  font-size: clamp(1.6rem, 1.4rem + 0.8vw, 2.1rem);
  font-weight: 500;
  letter-spacing: -0.012em;
  color: var(--text);
  margin: 80px 0 20px;
  padding-top: 28px;
  border-top: 1px solid var(--rule);
  font-variation-settings:
    "opsz" 144,
    "SOFT" 30;
}

h3 {
  font-family: var(--serif);
  font-size: 1.32rem;
  font-weight: 600;
  letter-spacing: -0.008em;
  color: var(--text);
  margin: 36px 0 10px;
  font-variation-settings:
    "opsz" 36,
    "SOFT" 50;
}

h3 .import {
  font-family: var(--mono);
  font-size: 0.78em;
  color: var(--accent);
  font-weight: 500;
}

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 data-lang="…"> are rendered through Shiki at
   build time (scripts/highlight-landing.ts) with dual-theme output: each
   span carries `--shiki-light` and `--shiki-dark` CSS variables but no
   default `color`. The rules below pick the active theme based on
   [data-theme] on <html>. Inline-prose token classes (.pb-kw / .pb-op)
   still use the accent variable directly. */
:root[data-theme="light"] pre[data-lang] span,
:root[data-theme="light"] pre[data-lang] {
  color: var(--shiki-light);
  font-style: var(--shiki-light-font-style, inherit);
  font-weight: var(--shiki-light-font-weight, inherit);
  text-decoration: var(--shiki-light-text-decoration, inherit);
}
:root[data-theme="dark"] pre[data-lang] span,
:root[data-theme="dark"] pre[data-lang] {
  color: var(--shiki-dark);
  font-style: var(--shiki-dark-font-style, inherit);
  font-weight: var(--shiki-dark-font-weight, inherit);
  text-decoration: var(--shiki-dark-text-decoration, inherit);
}
.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);
  background: var(--accent-soft);
  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: var(--accent-soft);
}
.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: var(--accent-soft);
}

/* ─── 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: 880px) {
  .page,
  .docs-body .page.docs-layout {
    padding: 32px 18px 96px;
  }

  /* Mobile header: brand on the left, hamburger on the right. The
     <details class="nav-dropdown"> wrapper holds both the summary
     (hamburger) and the nav links; on desktop the wrapper goes
     display:contents and the nav stays inline. Here it becomes a
     real block so the dropdown panel positions against it. */
  header {
    position: static;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 0;
    margin-top: 0;
    margin-bottom: 36px;
    background: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border-bottom: none;
  }
  .nav-dropdown {
    display: block;
    position: relative;
  }
  .nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 36px;
    height: 36px;
    padding: 8px 7px;
    border: 1px solid var(--rule);
    border-radius: 8px;
    background: color-mix(in srgb, var(--bg) 60%, transparent);
    backdrop-filter: blur(10px) saturate(150%);
    -webkit-backdrop-filter: blur(10px) saturate(150%);
    cursor: pointer;
    list-style: none;
    user-select: none;
  }
  .nav-toggle::-webkit-details-marker,
  .nav-toggle::marker {
    display: none;
  }
  .nav-toggle-bar {
    display: block;
    height: 2px;
    background: var(--text-dim);
    border-radius: 1px;
    transition:
      transform 200ms ease,
      opacity 160ms ease;
  }
  .nav-dropdown[open] .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .nav-dropdown[open] .nav-toggle-bar:nth-child(2) {
    opacity: 0;
  }
  .nav-dropdown[open] .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
  .nav-dropdown .nav {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    flex-direction: column;
    gap: 4px;
    min-width: 180px;
    padding: 10px 14px;
    border: 1px solid var(--rule);
    border-radius: 12px;
    background: color-mix(in srgb, var(--bg) 75%, transparent);
    backdrop-filter: blur(12px) saturate(150%);
    -webkit-backdrop-filter: blur(12px) saturate(150%);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
    font-size: 14px;
    z-index: 50;
  }
  .nav-dropdown .nav a {
    padding: 8px 4px;
  }

  /* 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;
  }
}