/* n-dx.dev — shared design system.
   Light and dark themes, one ink, two signal colours (n-dx purple, en-dash
   teal), and an 8-bit layer drawn on canvas by assets/js/pixel.js. Used by
   every page; changelog/index.html links it from the template in
   scripts/sync-changelog.mjs.

   Theme: dark follows prefers-color-scheme unless <html data-theme> says
   otherwise — the head script on each page sets it from localStorage before
   first paint, and the nav toggle (site.js) writes it. The dark token block is
   repeated for both routes because CSS cannot share a rule between them. */

:root {
  color-scheme: light;
  --paper: #fafafa;
  --paper-2: #f1f1f3;
  --paper-3: #e4e4e8;
  --ink: #16151c;
  --ink-2: #34333b;
  --mute: #66656d;
  --line: rgba(22, 21, 28, 0.14);
  --line-2: rgba(22, 21, 28, 0.3);
  --purple: #6a3df0;
  --purple-2: #4522b8;
  --on-purple: #ffffff;
  --lav: #b9a7ff;
  --teal: #00e0b0;
  --teal-ink: #007a60;
  --signal: #c2360b;
  --amber: #ffb020;
  --crt: #121019;
  --crt-2: #1c1926;
  --crt-line: rgba(255, 255, 255, 0.1);
  --crt-text: #d9d4ee;
  --crt-edge: transparent;
  /* Surfaces that stay dark in both themes: footer, ticker, callouts, chips. */
  --night: #16151c;
  --on-night: #f4f3f8;
  --shadow: #16151c;
  --nav-bg: rgba(250, 250, 250, 0.86);
  --hover: rgba(22, 21, 28, 0.06);
  --dot: rgba(22, 21, 28, 0.09);
  --sweep-dim: rgba(22, 21, 28, 0.16);
  --tint: rgba(106, 61, 240, 0.08);
  /* Type: Montserrat sets headlines and UI labels, Merriweather sets reading
     text, Geist Mono is reserved for code and terminals, Silkscreen for the
     8-bit accents. */
  --f-display: 'Montserrat', 'Helvetica Neue', Arial, sans-serif;
  --f-ui: 'Montserrat', 'Helvetica Neue', Arial, sans-serif;
  --f-body: 'Merriweather', Georgia, 'Times New Roman', serif;
  --f-mono: 'Geist Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  --f-pixel: 'Silkscreen', 'Geist Mono', monospace;

  --gutter: clamp(16px, 3.2vw, 48px);
  --max: 1440px;
  --nav-h: 60px;
  --ease: cubic-bezier(0.2, 0.7, 0.1, 1);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    color-scheme: dark;
    --paper: #0e0d13;
    --paper-2: #17161f;
    --paper-3: #24222e;
    --ink: #ecebf2;
    --ink-2: #c4c2d0;
    --mute: #9896a6;
    --line: rgba(255, 255, 255, 0.12);
    --line-2: rgba(255, 255, 255, 0.26);
    --purple: #8f72ff;
    --purple-2: #b3a0ff;
    --on-purple: #0e0d13;
    --teal-ink: #2fe6bd;
    --signal: #ff6a3d;
    --crt-edge: rgba(255, 255, 255, 0.12);
    --night: #1b1924;
    --on-night: #f4f3f8;
    --shadow: #2e2b3c;
    --nav-bg: rgba(14, 13, 19, 0.86);
    --hover: rgba(255, 255, 255, 0.07);
    --dot: rgba(255, 255, 255, 0.07);
    --sweep-dim: rgba(255, 255, 255, 0.16);
    --tint: rgba(143, 114, 255, 0.14);
  }
}
:root[data-theme='dark'] {
  color-scheme: dark;
  --paper: #0e0d13;
  --paper-2: #17161f;
  --paper-3: #24222e;
  --ink: #ecebf2;
  --ink-2: #c4c2d0;
  --mute: #9896a6;
  --line: rgba(255, 255, 255, 0.12);
  --line-2: rgba(255, 255, 255, 0.26);
  --purple: #8f72ff;
  --purple-2: #b3a0ff;
  --on-purple: #0e0d13;
  --teal-ink: #2fe6bd;
  --signal: #ff6a3d;
  --crt-edge: rgba(255, 255, 255, 0.12);
  --night: #1b1924;
  --on-night: #f4f3f8;
  --shadow: #2e2b3c;
  --nav-bg: rgba(14, 13, 19, 0.86);
  --hover: rgba(255, 255, 255, 0.07);
  --dot: rgba(255, 255, 255, 0.07);
  --sweep-dim: rgba(255, 255, 255, 0.16);
  --tint: rgba(143, 114, 255, 0.14);
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
/* Native scrolling throughout; only in-page anchor jumps glide. */
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 8px); }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.7;
  font-optical-sizing: auto;
  font-kerning: normal;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
/* Blueprint grain: a faint dot grid under everything. */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image: radial-gradient(var(--dot) 1px, transparent 1.2px);
  background-size: 24px 24px;
  background-position: 12px 12px;
}
main, header, footer, section { position: relative; }
main { z-index: 1; }
img, canvas, svg { display: block; max-width: 100%; }
a { color: inherit; }
p { margin: 0 0 1em; text-wrap: pretty; }
h1, h2, h3, h4 { margin: 0; font-family: var(--f-display); font-weight: 700; letter-spacing: -0.01em; line-height: 1.15; text-wrap: balance; }
strong, b { font-weight: 700; }
code, kbd, pre { font-family: var(--f-mono); }
::selection { background: var(--purple); color: #fff; }
button { font: inherit; color: inherit; }

.skip-link {
  position: absolute; left: 16px; top: -100px; z-index: 1000;
  background: var(--ink); color: var(--paper); padding: 10px 16px;
  font-family: var(--f-ui); font-size: 13px; font-weight: 600; text-decoration: none;
}
.skip-link:focus { top: 8px; }
:focus-visible { outline: 2px solid var(--purple); outline-offset: 3px; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
.pixelated { image-rendering: pixelated; image-rendering: crisp-edges; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ── type ─────────────────────────────────────────────────────────── */
/* Montserrat caps run wide, so display sizes sit a step below a grotesk's. */
.display {
  font-family: var(--f-display);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.025em;
  line-height: 0.95;
}
.h-xl { font-size: clamp(2.6rem, 7.4vw, 7.6rem); }
.h-lg { font-size: clamp(2.1rem, 4.6vw, 4.4rem); }
.h-md { font-size: clamp(1.7rem, 3vw, 2.8rem); line-height: 1; }
.h-sm { font-size: clamp(1.2rem, 1.7vw, 1.5rem); line-height: 1.1; letter-spacing: -0.015em; }
/* UI label: small tracked caps. Code keeps Geist Mono via code/.cmd/.crt. */
.mono { font-family: var(--f-ui); font-size: 11px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; }
.pixel { font-family: var(--f-pixel); text-transform: uppercase; letter-spacing: 0.02em; }
.lede { font-size: clamp(1.05rem, 1.3vw, 1.2rem); font-weight: 300; line-height: 1.65; color: var(--ink-2); max-width: 36em; }
.muted { color: var(--mute); }
.accent { color: var(--purple); }
.t-teal { color: var(--teal-ink); }
.t-signal { color: var(--signal); }
.idx { font-family: var(--f-ui); font-size: 11px; font-weight: 600; letter-spacing: 0.06em; color: var(--mute); font-variant-numeric: tabular-nums; }
.idx::before { content: '['; }
.idx::after { content: ']'; }

/* Inline code chip — how commands appear in prose. */
.cmd {
  font-family: var(--f-mono);
  font-size: 0.86em;
  background: var(--night);
  color: var(--teal);
  padding: 0.12em 0.5em;
  white-space: nowrap;
}
.cmd::before { content: '$ '; color: var(--mute); }
.path { font-family: var(--f-mono); font-size: 0.88em; background: var(--tint); color: var(--purple-2); padding: 0.08em 0.4em; }

/* ── registration marks & rulers (the blueprint furniture) ────────── */
.reg { position: relative; }
.reg::before, .reg::after {
  content: '+';
  position: absolute;
  font-family: var(--f-mono);
  font-size: 14px;
  line-height: 1;
  color: var(--ink);
  pointer-events: none;
}
.reg::before { top: -7px; left: -4px; }
.reg::after { bottom: -7px; right: -4px; }
.frame { border: 1px solid var(--line-2); }
.hr { height: 1px; background: var(--line-2); border: 0; margin: 0; }
.dash { border-top: 1px dashed var(--line-2); }

/* Section header bar: [01] LABEL ─────────── ruler ticks */
.bar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 0;
  border-top: 1px solid var(--ink);
  font-family: var(--f-ui);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.bar .ticks {
  flex: 1;
  height: 8px;
  background-image: linear-gradient(90deg, var(--line-2) 1px, transparent 1px);
  background-size: 10px 8px;
  opacity: 0.8;
}
.bar .ticks.big { background-image: linear-gradient(90deg, var(--ink) 1px, transparent 1px), linear-gradient(90deg, var(--line-2) 1px, transparent 1px); background-size: 100px 8px, 10px 4px; background-repeat: repeat-x; }

/* ── buttons ──────────────────────────────────────────────────────── */
.btn {
  --bg: var(--ink); --fg: var(--paper); --hv: var(--purple);
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 46px;
  padding: 0 20px;
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--bg);
  font-family: var(--f-ui);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  text-decoration: none;
  cursor: pointer;
  overflow: hidden;
  isolation: isolate;
  white-space: nowrap;
}
/* Fill wipes up in stepped 8-bit increments. */
.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--hv);
  transform: translateY(101%);
  transition: transform 0.36s steps(6);
  z-index: -1;
}
.btn:hover::before, .btn:focus-visible::before { transform: translateY(0); }
.btn .arr { display: inline-block; transition: transform 0.3s steps(3); }
.btn:hover .arr { transform: translateX(4px); }
.btn-ghost { --bg: transparent; --fg: var(--ink); --hv: var(--ink); border-color: var(--ink); }
.btn-ghost:hover { color: var(--paper); }
.btn-teal { --bg: var(--teal); --fg: var(--ink); --hv: var(--ink); border-color: var(--teal); }
.btn-teal:hover { color: var(--teal); }
.btn-sm { min-height: 36px; padding: 0 14px; font-size: 11px; }

/* ── nav ──────────────────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 0 var(--gutter);
  background: var(--nav-bg);
  backdrop-filter: blur(10px) saturate(1.2);
  -webkit-backdrop-filter: blur(10px) saturate(1.2);
  border-bottom: 1px solid var(--line);
  transition: transform 0.4s var(--ease);
}
.nav.hide { transform: translateY(-100%); }
.logo { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.logo img { width: 30px; height: 30px; border-radius: 6px; }
.logo-word { font-family: var(--f-display); font-weight: 800; font-size: 21px; line-height: 1; letter-spacing: -0.03em; }
.nav-links { display: flex; gap: 2px; list-style: none; margin: 0 0 0 auto; padding: 0; }
.nav-links a {
  display: block;
  padding: 8px 12px;
  font-family: var(--f-ui);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  text-decoration: none;
  color: var(--ink-2);
}
.nav-links a:hover, .nav-links a[aria-current] { color: var(--ink); background: var(--hover); }
.nav-links a[aria-current]::before { content: '▸ '; color: var(--purple); }
.nav-cta { display: flex; gap: 8px; }
.nav-toggle { display: none; margin-left: auto; width: 44px; height: 44px; background: none; border: 1px solid var(--ink); cursor: pointer; }
.nav-toggle span { display: block; width: 18px; height: 2px; margin: 4px auto; background: var(--ink); }

@media (max-width: 1060px) {
  .nav-toggle { display: block; }
  .nav-menu {
    display: none;
    position: absolute;
    top: var(--nav-h); left: 0; right: 0;
    flex-direction: column;
    gap: 16px;
    padding: 16px var(--gutter) 24px;
    background: var(--paper);
    border-bottom: 1px solid var(--ink);
  }
  .nav.open .nav-menu { display: flex; }
  .nav-links { flex-direction: column; margin: 0; }
  .nav-links a { padding: 12px 0; font-size: 13px; border-bottom: 1px dashed var(--line-2); }
  .nav-cta .btn { flex: 1; justify-content: center; }
}
@media (min-width: 1061px) {
  .nav-menu { display: contents; }
}

/* ── pointer label (fine pointers, only where a page sets one; site.js) ─ */
.ptag {
  position: fixed;
  left: 0; top: 0;
  z-index: 9990;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s;
  font-family: var(--f-ui);
  font-weight: 600;
  letter-spacing: 0.04em;
  font-size: 11px;
  line-height: 1.3;
  color: var(--on-night);
  background: var(--night);
  padding: 3px 6px;
  white-space: nowrap;
  box-shadow: 2px 2px 0 var(--purple);
}
.ptag.on { opacity: 1; }

@keyframes blink { 50% { opacity: 0; } }

/* ── CRT screen (terminal panels) ────────────────────────────────── */
.crt {
  position: relative;
  background: var(--crt);
  color: var(--crt-text);
  box-shadow: inset 0 0 0 1px var(--crt-edge);
  font-family: var(--f-mono);
  font-size: 13px;
  line-height: 1.65;
  overflow: hidden;
}
.crt::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(0deg, rgba(0, 0, 0, 0.22) 0 1px, transparent 1px 3px);
  mix-blend-mode: multiply;
}
.crt-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--crt-line);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #8f89a8;
}
.crt-head .dots { display: flex; gap: 6px; }
.crt-head .dots i { width: 8px; height: 8px; background: #3a3548; }
.crt-head .dots i:first-child { background: var(--signal); }
.crt-body { padding: 16px 18px; white-space: pre-wrap; word-break: break-word; }
.crt .c-p { color: #9b7dff; }
.crt .c-t { color: var(--teal); }
.crt .c-m { color: #7c7690; }
.crt .c-o { color: #ff7a52; }
.crt .c-a { color: var(--amber); }
.crt .c-w { color: #fff; }
.crt .caret { display: inline-block; width: 0.6em; height: 1.1em; background: var(--teal); vertical-align: -0.2em; animation: blink 0.8s steps(1) infinite; }

/* ── pill (hero version — shape set by sync-changelog.mjs) ───────── */
.hero-version-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px 6px 6px;
  border: 1px solid var(--ink);
  font-family: var(--f-ui);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  text-decoration: none;
  background: var(--paper);
  transition: background 0.2s;
}
.hero-version-pill:hover { background: var(--ink); color: var(--paper); }
.hero-version-num { background: var(--purple); color: var(--on-purple); padding: 3px 7px; }
.hero-version-sep { color: var(--mute); }
.hero-version-arrow { transition: transform 0.25s steps(3); }
.hero-version-pill:hover .hero-version-arrow { transform: translateX(3px); }

/* ── release cards (landing changelog region — sync-changelog.mjs) ─ */
.changelog-section { padding: clamp(80px, 10vw, 140px) 0; }
.changelog-header { display: flex; align-items: end; justify-content: space-between; gap: 24px; flex-wrap: wrap; margin: 28px 0 40px; }
.changelog-header .section-body { max-width: 34em; color: var(--ink-2); margin: 16px 0 0; }
.release-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--ink); border-left: 1px solid var(--line-2); }
.release-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px;
  min-height: 280px;
  border-right: 1px solid var(--line-2);
  border-bottom: 1px solid var(--line-2);
  text-decoration: none;
  transition: background 0.2s;
  position: relative;
}
.release-card:hover { background: var(--paper-2); }
.release-card:hover .release-version { color: var(--purple); }
.release-card-head { display: flex; align-items: center; justify-content: space-between; }
.release-version { font-family: var(--f-display); font-size: 2.3rem; font-weight: 800; letter-spacing: -0.03em; font-variant-numeric: tabular-nums; line-height: 1; transition: color 0.2s; }
.release-bump, .cl-release-bump { font-family: var(--f-pixel); font-size: 11px; text-transform: uppercase; padding: 3px 8px; border: 1px solid currentColor; }
.release-bump.minor, .cl-release-bump.minor { color: var(--purple); }
.release-bump.patch, .cl-release-bump.patch { color: var(--teal-ink); }
.release-bump.major, .cl-release-bump.major { color: var(--signal); }
.release-date { font-family: var(--f-ui); font-size: 11px; font-weight: 600; letter-spacing: 0.1em; color: var(--mute); text-transform: uppercase; }
.release-bullets { margin: 6px 0 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 10px; font-size: 14px; line-height: 1.6; color: var(--ink-2); }
.release-bullets li { position: relative; padding-left: 16px; }
.release-bullets li::before { content: ''; position: absolute; left: 0; top: 0.55em; width: 6px; height: 6px; background: var(--purple); }
.release-more { margin-top: auto; font-family: var(--f-ui); font-size: 11px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--purple); }
.section-label { font-family: var(--f-ui); font-size: 11px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--mute); }
.section-title { font-family: var(--f-display); font-weight: 800; text-transform: uppercase; letter-spacing: -0.025em; line-height: 0.95; font-size: clamp(2.1rem, 4.6vw, 4.4rem); }
@media (max-width: 900px) { .release-grid { grid-template-columns: 1fr; } .release-card { min-height: 0; } }

/* ── footer ──────────────────────────────────────────────────────── */
.foot { position: relative; z-index: 1; background: var(--night); color: var(--on-night); overflow: hidden; box-shadow: inset 0 1px 0 var(--crt-edge); }
.foot a { text-decoration: none; }
.foot-top { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; padding: 72px 0 40px; }
.foot h4 { font-family: var(--f-ui); font-size: 11px; font-weight: 600; text-transform: uppercase; color: #8d8a99; margin: 0 0 14px; letter-spacing: 0.1em; }
.foot ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.foot ul a { font-family: var(--f-ui); font-weight: 500; color: var(--on-night); opacity: 0.85; font-size: 14px; }
.foot ul a:hover { opacity: 1; color: var(--teal); }
.foot-blurb { color: #a9a6b5; font-size: 14px; line-height: 1.7; max-width: 26em; }
.foot-word { position: relative; width: 100%; height: clamp(120px, 24vw, 340px); }
.foot-word canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.foot-bottom { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; padding: 20px 0 28px; border-top: 1px solid rgba(255, 255, 255, 0.14); font-family: var(--f-ui); font-size: 11px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: #8d8a99; }
.foot-bottom img { height: 34px; width: auto; }
.foot-endash { display: inline-flex; align-items: center; gap: 10px; }
@media (max-width: 800px) { .foot-top { grid-template-columns: 1fr 1fr; } .foot-top > :first-child { grid-column: 1 / -1; } }

/* ── reveal hooks (JS adds html.js; content is visible without it) ─ */
.js [data-reveal] { opacity: 0; transform: translateY(24px); }
.js [data-reveal].in { opacity: 1; transform: none; transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.js [data-stagger] > * { opacity: 0; transform: translateY(18px); }
.js [data-stagger].in > * { opacity: 1; transform: none; transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
.js [data-stagger].in > *:nth-child(2) { transition-delay: 0.07s; }
.js [data-stagger].in > *:nth-child(3) { transition-delay: 0.14s; }
.js [data-stagger].in > *:nth-child(4) { transition-delay: 0.21s; }
.js [data-stagger].in > *:nth-child(5) { transition-delay: 0.28s; }
.js [data-stagger].in > *:nth-child(6) { transition-delay: 0.35s; }
.js [data-stagger].in > *:nth-child(7) { transition-delay: 0.42s; }
.js [data-stagger].in > *:nth-child(8) { transition-delay: 0.49s; }

/* Word-by-word ink sweep for statement paragraphs (site.js splits words). */
.sweep .w { color: var(--sweep-dim); transition: color 0.25s; }
.sweep .w.lit { color: var(--ink); }
.sweep .w.hl.lit { color: var(--purple); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .js [data-reveal], .js [data-stagger] > * { opacity: 1 !important; transform: none !important; }
  .sweep .w { color: var(--ink) !important; }
  .sweep .w.hl { color: var(--purple) !important; }
}

/* ── theme toggle ────────────────────────────────────────────────── */
.theme-toggle { display: inline-grid; place-items: center; width: 36px; height: 36px; margin-left: 8px; padding: 0; background: none; border: 1px solid var(--line-2); cursor: pointer; }
.theme-toggle:hover { border-color: var(--ink); background: var(--hover); }
.theme-toggle canvas { width: 18px; height: 18px; }
.theme-toggle .i-sun { display: none; }
:root[data-theme='dark'] .theme-toggle .i-sun { display: block; }
:root[data-theme='dark'] .theme-toggle .i-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .theme-toggle .i-sun { display: block; }
  :root:not([data-theme]) .theme-toggle .i-moon { display: none; }
}
@media (max-width: 1060px) { .theme-toggle { width: 44px; height: 44px; } }