/* ============================================================
   NexaCore OS — Public site stylesheet
   Direction:     C — Civic Tech / Generational
   Authoritative: brand/STRATEGY.md, brand/colors/*, brand/typography/*
   Scope:         index.html (landing) + technology.html (deep dive)

   Colour tokens are imported verbatim from the brand source of truth.
   Typography tokens are mirrored from brand/typography/type-tokens.css
   (the @font-face block is intentionally NOT imported — the three SIL OFL
   families are loaded from Google Fonts in each page <head> so the type
   renders as designed even though the WOFF2 files are not yet vendored).
   ============================================================ */

@import url("../brand/colors/tokens.css");

:root {
  /* Typography — mirrored from brand/typography/type-tokens.css */
  --nexacore-font-display: 'Source Serif 4', 'Source Serif Pro', Georgia, 'Times New Roman', serif;
  --nexacore-font-body:    'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --nexacore-font-mono:    'IBM Plex Mono', ui-monospace, 'SF Mono', 'Cascadia Mono', 'Roboto Mono', Menlo, Consolas, monospace;

  --nexacore-text-xs:   0.75rem;
  --nexacore-text-sm:   0.875rem;
  --nexacore-text-base: 1rem;
  --nexacore-text-lg:   1.25rem;
  --nexacore-text-xl:   1.5625rem;
  --nexacore-text-2xl:  1.953rem;
  --nexacore-text-3xl:  2.441rem;
  --nexacore-text-4xl:  3.052rem;
  --nexacore-text-5xl:  3.815rem;

  --nexacore-leading-tight:   1.15;
  --nexacore-leading-snug:    1.4;
  --nexacore-leading-normal:  1.55;
  --nexacore-leading-relaxed: 1.6;

  --nexacore-tracking-tight:  -0.015em;
  --nexacore-tracking-wide:    0.06em;
  --nexacore-tracking-wider:   0.08em;
  --nexacore-tracking-widest:  0.12em;

  --nexacore-weight-regular:  400;
  --nexacore-weight-medium:   500;
  --nexacore-weight-semibold: 600;
  --nexacore-weight-bold:     700;

  /* Layout */
  --nexacore-maxw:      72rem;
  --nexacore-prose:     38rem;
  --nexacore-gutter:    clamp(1.25rem, 5vw, 4rem);
  --nexacore-section-y: clamp(3.5rem, 8vw, 7rem);
  --nexacore-radius:    4px;

  /* Code-syntax accents — light mode (legible on --nexacore-bg-code = petrol-50) */
  --code-keyword: var(--nexacore-petrol-600);
  --code-string:  var(--nexacore-sage-700);
  --code-comment: var(--nexacore-charcoal-300);
  --code-number:  var(--nexacore-brick-700);
  --code-attr:    var(--nexacore-petrol-700);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-nexacore-theme="light"]) {
    /* Code-syntax accents — dark mode (legible on --nexacore-bg-code = petrol-900) */
    --code-keyword: var(--nexacore-petrol-200);
    --code-string:  var(--nexacore-sage-300);
    --code-comment: var(--nexacore-charcoal-300);
    --code-number:  var(--nexacore-brick-300);
    --code-attr:    var(--nexacore-petrol-200);
  }
}
[data-nexacore-theme="dark"] {
  --code-keyword: var(--nexacore-petrol-200);
  --code-string:  var(--nexacore-sage-300);
  --code-comment: var(--nexacore-charcoal-300);
  --code-number:  var(--nexacore-brick-300);
  --code-attr:    var(--nexacore-petrol-200);
}

/* ---------- Reset & base ---------------------------------- */

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

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

body {
  margin: 0;
  background: var(--nexacore-bg-canvas);
  color: var(--nexacore-text-primary);
  font-family: var(--nexacore-font-body);
  font-size: var(--nexacore-text-base);
  line-height: var(--nexacore-leading-normal);
  font-feature-settings: "liga" on, "calt" on, "kern" on;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 {
  font-family: var(--nexacore-font-display);
  font-weight: var(--nexacore-weight-bold);
  letter-spacing: var(--nexacore-tracking-tight);
  line-height: var(--nexacore-leading-tight);
  color: var(--nexacore-text-accent);
  margin: 0 0 0.6em;
}
h1 { font-size: var(--nexacore-text-4xl); }
h2 { font-size: var(--nexacore-text-2xl); }
h3 { font-size: var(--nexacore-text-xl); }
h4 {
  font-family: var(--nexacore-font-body);
  font-weight: var(--nexacore-weight-semibold);
  font-size: var(--nexacore-text-lg);
  color: var(--nexacore-text-primary);
  margin: 0 0 0.5em;
  letter-spacing: 0;
}

p { margin: 0 0 1.1em; max-width: var(--nexacore-prose); }
.measure-wide p { max-width: 46rem; }

a { color: var(--nexacore-text-link); text-decoration: underline; text-underline-offset: 2px; text-decoration-thickness: 1px; }
a:hover { color: var(--nexacore-text-link-hover); }
a:focus-visible { outline: 2px solid var(--nexacore-focus-ring); outline-offset: 2px; border-radius: 2px; }

strong { font-weight: var(--nexacore-weight-semibold); }
hr { border: 0; border-top: 1px solid var(--nexacore-rule); margin: var(--nexacore-section-y) 0; }

::selection { background: var(--nexacore-petrol-500); color: var(--nexacore-cream-300); }

/* ---------- Layout helpers -------------------------------- */

.wrap { max-width: var(--nexacore-maxw); margin-inline: auto; padding-inline: var(--nexacore-gutter); }
.section { padding-block: var(--nexacore-section-y); }
.section--surface { background: var(--nexacore-bg-surface); }
.section--surface-2 { background: var(--nexacore-bg-surface-2); }

.eyebrow {
  font-family: var(--nexacore-font-mono);
  font-size: var(--nexacore-text-xs);
  font-weight: var(--nexacore-weight-medium);
  letter-spacing: var(--nexacore-tracking-wider);
  text-transform: uppercase;
  color: var(--nexacore-text-secondary);
  margin: 0 0 1rem;
}
.eyebrow::before {
  content: "";
  display: inline-block;
  width: 1.75rem;
  height: 1px;
  vertical-align: middle;
  margin-right: 0.75rem;
  background: var(--nexacore-rule);
}

.section-head { max-width: 46rem; margin-bottom: clamp(2rem, 4vw, 3rem); }
.section-head p { font-size: var(--nexacore-text-lg); color: var(--nexacore-text-secondary); max-width: 42rem; }

/* ---------- Skip link & focus ----------------------------- */
.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--nexacore-petrol-500); color: var(--nexacore-cream-300);
  padding: 0.6rem 1rem; z-index: 100; border-radius: 0 0 var(--nexacore-radius) 0;
}
.skip-link:focus { left: 0; }

/* ---------- Top navigation -------------------------------- */

.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--nexacore-bg-canvas) 88%, transparent);
  backdrop-filter: saturate(1.2) blur(8px);
  border-bottom: 1px solid var(--nexacore-border-default);
}
.nav__inner { display: flex; align-items: center; gap: 1.5rem; min-height: 64px; }
.nav__brand { display: inline-flex; align-items: center; gap: 0.6rem; text-decoration: none; color: var(--nexacore-text-accent); font-family: var(--nexacore-font-display); font-weight: 700; font-size: var(--nexacore-text-lg); letter-spacing: var(--nexacore-tracking-tight); }
.nav__brand:hover { color: var(--nexacore-text-accent); }
.nav__mark { width: 28px; height: 28px; flex: none; }
.nav__links { margin-left: auto; display: flex; align-items: center; gap: clamp(0.75rem, 2vw, 1.75rem); }
.nav__links a {
  font-family: var(--nexacore-font-body); font-size: var(--nexacore-text-sm); font-weight: 500;
  color: var(--nexacore-text-secondary); text-decoration: none;
}
.nav__links a:hover { color: var(--nexacore-text-accent); }
.nav__links a[aria-current="page"] { color: var(--nexacore-text-accent); }
.nav__cta { white-space: nowrap; }
.theme-toggle {
  font-family: var(--nexacore-font-mono); font-size: var(--nexacore-text-xs); letter-spacing: var(--nexacore-tracking-wide);
  background: transparent; color: var(--nexacore-text-secondary);
  border: 1px solid var(--nexacore-border-strong); border-radius: var(--nexacore-radius);
  padding: 0.3rem 0.55rem; cursor: pointer; text-transform: uppercase;
}
.theme-toggle:hover { color: var(--nexacore-text-accent); border-color: var(--nexacore-border-accent); }
@media (max-width: 640px) { .nav__links a:not(.nav__cta) { display: none; } }

/* ---------- Buttons --------------------------------------- */

.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--nexacore-font-body); font-size: var(--nexacore-text-sm); font-weight: 600;
  padding: 0.7rem 1.15rem; border-radius: var(--nexacore-radius); text-decoration: none;
  border: 1px solid transparent; cursor: pointer; line-height: 1; min-height: 44px;
}
.btn--primary { background: var(--nexacore-petrol-500); color: var(--nexacore-cream-300); border-color: var(--nexacore-petrol-500); }
.btn--primary:hover { background: var(--nexacore-petrol-700); color: var(--nexacore-cream-300); }
.btn--ghost { background: transparent; color: var(--nexacore-text-accent); border-color: var(--nexacore-border-accent); }
.btn--ghost:hover { background: var(--nexacore-bg-surface-2); color: var(--nexacore-text-accent); }
.btn__arrow { font-family: var(--nexacore-font-mono); }

/* ---------- Status pills (brand pattern) ------------------ */

.nexacore-status {
  font-family: var(--nexacore-font-mono); font-size: var(--nexacore-text-xs); font-weight: 500;
  letter-spacing: var(--nexacore-tracking-wider); text-transform: uppercase;
  padding: 3px 8px; border-radius: 2px; display: inline-block; white-space: nowrap;
}
.nexacore-status--draft    { background: var(--nexacore-bg-surface-2); color: var(--nexacore-text-secondary); border: 1px solid var(--nexacore-border-default); }
.nexacore-status--review   { background: var(--nexacore-bg-surface-2); color: var(--nexacore-status-info); border: 1px solid var(--nexacore-status-info); }
.nexacore-status--active   { background: var(--nexacore-sage-100); color: var(--nexacore-sage-900); }
.nexacore-status--final    { background: var(--nexacore-petrol-500); color: var(--nexacore-cream-300); }
.nexacore-status--critical { background: var(--nexacore-brick-500); color: var(--nexacore-cream-300); }

/* ---------- Hero ------------------------------------------ */

.hero { padding-block: clamp(3.5rem, 9vw, 8rem) clamp(3rem, 7vw, 6rem); }
.hero__grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: clamp(2rem, 5vw, 4.5rem); align-items: center; }
.hero__metaline { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.5rem; }
.hero h1 { font-size: clamp(2.6rem, 6vw, var(--nexacore-text-5xl)); margin-bottom: 0.4em; }
.hero__lede { font-family: var(--nexacore-font-display); font-size: var(--nexacore-text-lg); line-height: var(--nexacore-leading-normal); color: var(--nexacore-text-secondary); max-width: 34rem; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 2rem; }
.hero__mark { display: grid; place-items: center; }
.hero__mark svg { width: min(280px, 70%); height: auto; }
@media (max-width: 820px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__mark { order: -1; justify-items: start; }
  .hero__mark svg { width: 140px; }
}

/* ---------- Cards / grids --------------------------------- */

.grid { display: grid; gap: 1.25rem; }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; } }

.card {
  background: var(--nexacore-bg-surface); border: 1px solid var(--nexacore-border-default);
  border-radius: var(--nexacore-radius); padding: 1.5rem 1.5rem 1.6rem;
}
.card__icon { color: var(--nexacore-petrol-500); width: 32px; height: 32px; display: block; margin-bottom: 1rem; }
.card h3 { font-size: var(--nexacore-text-lg); font-family: var(--nexacore-font-body); font-weight: 600; color: var(--nexacore-text-primary); letter-spacing: 0; margin-bottom: 0.4em; }
.card p { font-size: var(--nexacore-text-sm); color: var(--nexacore-text-secondary); margin: 0; max-width: none; }
.card p + p { margin-top: 0.7em; }

/* ---------- Stat row -------------------------------------- */

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--nexacore-border-default); border: 1px solid var(--nexacore-border-default); border-radius: var(--nexacore-radius); overflow: hidden; }
.stat { background: var(--nexacore-bg-surface); padding: 1.25rem 1.25rem; }
.stat__num { font-family: var(--nexacore-font-display); font-weight: 700; font-size: var(--nexacore-text-2xl); color: var(--nexacore-text-accent); line-height: 1; }
.stat__label { font-family: var(--nexacore-font-mono); font-size: var(--nexacore-text-xs); letter-spacing: var(--nexacore-tracking-wide); text-transform: uppercase; color: var(--nexacore-text-secondary); margin-top: 0.5rem; }
@media (max-width: 720px) { .stats { grid-template-columns: repeat(2, 1fr); } }

/* ---------- Tiers ladder ---------------------------------- */

.tiers { display: grid; gap: 1rem; }
.tier { display: grid; grid-template-columns: auto 1fr auto; gap: 1.25rem; align-items: center;
  background: var(--nexacore-bg-surface); border: 1px solid var(--nexacore-border-default);
  border-left: 3px solid var(--nexacore-border-accent); border-radius: var(--nexacore-radius); padding: 1.1rem 1.4rem; }
.tier__idx { font-family: var(--nexacore-font-mono); font-size: var(--nexacore-text-sm); color: var(--nexacore-text-tertiary); }
.tier__body h4 { margin: 0 0 0.25em; }
.tier__body p { margin: 0; font-size: var(--nexacore-text-sm); color: var(--nexacore-text-secondary); max-width: 48rem; }
.tier__scale { font-family: var(--nexacore-font-mono); font-size: var(--nexacore-text-sm); color: var(--nexacore-text-accent); white-space: nowrap; }
@media (max-width: 640px) { .tier { grid-template-columns: auto 1fr; } .tier__scale { grid-column: 2; } }

/* ---------- Manifesto band (petrol) ----------------------- */

.band { background: var(--nexacore-petrol-500); color: var(--nexacore-cream-300); }
.band .wrap { padding-block: clamp(3rem, 7vw, 5.5rem); }
.band__quote {
  font-family: var(--nexacore-font-display); font-style: italic; font-weight: 600;
  font-size: clamp(1.6rem, 4vw, var(--nexacore-text-3xl)); line-height: var(--nexacore-leading-snug);
  color: var(--nexacore-cream-300); max-width: 30em; margin: 0;
}
.band__attr { font-family: var(--nexacore-font-mono); font-size: var(--nexacore-text-xs); letter-spacing: var(--nexacore-tracking-wide); text-transform: uppercase; color: var(--nexacore-petrol-200); margin-top: 1.5rem; }

/* ---------- Pull quote (brand pattern) -------------------- */
.nexacore-pullquote {
  font-family: var(--nexacore-font-display); font-style: italic; font-weight: 600;
  font-size: var(--nexacore-text-2xl); line-height: var(--nexacore-leading-snug);
  color: var(--nexacore-text-accent); max-width: 38rem;
  padding-left: 1rem; border-left: 3px solid var(--nexacore-border-accent); margin: 2rem 0;
}

/* ---------- Code blocks ----------------------------------- */

.code {
  background: var(--nexacore-bg-code);
  border: 1px solid var(--nexacore-border-default);
  border-left: 3px solid var(--nexacore-border-accent);
  border-radius: var(--nexacore-radius);
  overflow: hidden; margin: 0 0 1.25rem;
}
.code__bar {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 0.5rem 1rem; border-bottom: 1px solid var(--nexacore-border-default);
  background: color-mix(in srgb, var(--nexacore-bg-code) 70%, var(--nexacore-bg-surface));
}
.code__name { font-family: var(--nexacore-font-mono); font-size: var(--nexacore-text-xs); letter-spacing: var(--nexacore-tracking-wide); color: var(--nexacore-text-secondary); }
.code__tag  { font-family: var(--nexacore-font-mono); font-size: var(--nexacore-text-xs); letter-spacing: var(--nexacore-tracking-wide); color: var(--nexacore-text-tertiary); text-transform: uppercase; }
pre {
  margin: 0; padding: 1.1rem 1.25rem; overflow-x: auto;
  font-family: var(--nexacore-font-mono); font-size: 0.86rem; line-height: var(--nexacore-leading-relaxed);
  color: var(--nexacore-text-primary);
  font-feature-settings: "liga" off, "calt" off;
}
code { font-family: var(--nexacore-font-mono); }
p code, li code, td code {
  background: var(--nexacore-bg-code); padding: 0.1em 0.35em; border-radius: 3px;
  font-size: 0.9em; color: var(--nexacore-text-accent);
}
/* token classes for the ncScript showcase */
.tok-c { color: var(--code-comment); font-style: italic; }
.tok-k { color: var(--code-keyword); font-weight: 600; }
.tok-s { color: var(--code-string); }
.tok-n { color: var(--code-number); }
.tok-a { color: var(--code-attr); }
.tok-f { color: var(--nexacore-text-accent); }

/* ---------- Tables ---------------------------------------- */

.table-wrap { overflow-x: auto; border: 1px solid var(--nexacore-border-default); border-radius: var(--nexacore-radius); }
table { border-collapse: collapse; width: 100%; font-size: var(--nexacore-text-sm); }
caption { text-align: left; font-family: var(--nexacore-font-mono); font-size: var(--nexacore-text-xs); letter-spacing: var(--nexacore-tracking-wide); text-transform: uppercase; color: var(--nexacore-text-secondary); padding: 0.75rem 1rem; }
th, td { text-align: left; padding: 0.65rem 1rem; border-bottom: 1px solid var(--nexacore-border-default); vertical-align: top; }
thead th { font-family: var(--nexacore-font-mono); font-size: var(--nexacore-text-xs); letter-spacing: var(--nexacore-tracking-wide); text-transform: uppercase; color: var(--nexacore-text-secondary); background: var(--nexacore-bg-surface-2); }
tbody tr:last-child td { border-bottom: 0; }
td code { white-space: nowrap; }

/* ---------- Definition list / spec rows ------------------- */
.spec { display: grid; grid-template-columns: 12rem 1fr; gap: 0.25rem 1.5rem; }
.spec dt { font-family: var(--nexacore-font-mono); font-size: var(--nexacore-text-xs); letter-spacing: var(--nexacore-tracking-wide); text-transform: uppercase; color: var(--nexacore-text-secondary); padding-top: 0.85rem; border-top: 1px solid var(--nexacore-border-default); }
.spec dd { margin: 0; padding-top: 0.85rem; border-top: 1px solid var(--nexacore-border-default); font-size: var(--nexacore-text-sm); }
@media (max-width: 640px) { .spec { grid-template-columns: 1fr; } .spec dd { padding-top: 0.2rem; border-top: 0; } }

/* ---------- Callout (honest / risk) ----------------------- */
.callout {
  display: grid; grid-template-columns: auto 1fr; gap: 1rem; align-items: start;
  background: var(--nexacore-bg-surface); border: 1px solid var(--nexacore-border-default);
  border-radius: var(--nexacore-radius); padding: 1.25rem 1.4rem;
}
.callout--risk { border-left: 3px solid var(--nexacore-brick-500); }
.callout p { margin: 0; font-size: var(--nexacore-text-sm); color: var(--nexacore-text-secondary); max-width: 52rem; }
.callout p + p { margin-top: 0.6em; }

/* ---------- Inline note ----------------------------------- */
.note { font-size: var(--nexacore-text-sm); color: var(--nexacore-text-tertiary); }

/* ---------- TOC (tech page) ------------------------------- */
.toc { position: sticky; top: 80px; align-self: start; }
.toc ul { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--nexacore-border-default); }
.toc li { margin: 0; }
.toc a { display: block; padding: 0.35rem 0 0.35rem 1rem; margin-left: -1px; border-left: 1px solid transparent; font-size: var(--nexacore-text-sm); color: var(--nexacore-text-secondary); text-decoration: none; }
.toc a:hover { color: var(--nexacore-text-accent); border-left-color: var(--nexacore-border-accent); }
.doc-layout { display: grid; grid-template-columns: 14rem 1fr; gap: clamp(2rem, 5vw, 4rem); }
@media (max-width: 900px) { .doc-layout { grid-template-columns: 1fr; } .toc { display: none; } }
.doc-body > section { padding-top: 1rem; margin-bottom: clamp(2.5rem, 5vw, 4rem); scroll-margin-top: 84px; }
.doc-body h2 { margin-top: 0; }

/* ---------- Footer ---------------------------------------- */

.footer { background: var(--nexacore-bg-inverse); color: var(--nexacore-text-inverse); }
.footer .wrap { padding-block: clamp(3rem, 6vw, 4.5rem); }
.footer__top { display: flex; flex-wrap: wrap; gap: 2rem; justify-content: space-between; align-items: start; }
.footer__brand { max-width: 24rem; }
.footer__brand .tag { font-family: var(--nexacore-font-display); font-size: var(--nexacore-text-lg); color: var(--nexacore-text-inverse); margin: 0.75rem 0 0; }
.footer__cols { display: flex; gap: clamp(2rem, 6vw, 4rem); flex-wrap: wrap; }
.footer__col h5 { font-family: var(--nexacore-font-mono); font-size: var(--nexacore-text-xs); letter-spacing: var(--nexacore-tracking-wider); text-transform: uppercase; color: var(--nexacore-petrol-200); margin: 0 0 0.75rem; }
.footer__col a { display: block; color: var(--nexacore-text-inverse); opacity: 0.85; text-decoration: none; font-size: var(--nexacore-text-sm); padding: 0.25rem 0; }
.footer__col a:hover { opacity: 1; text-decoration: underline; }
.footer__mark { width: 30px; height: 30px; }
.footer hr { border-top-color: color-mix(in srgb, var(--nexacore-text-inverse) 18%, transparent); margin: 2.5rem 0 1.5rem; }
.nexacore-doc-fingerprint { font-family: var(--nexacore-font-mono); font-size: var(--nexacore-text-xs); letter-spacing: var(--nexacore-tracking-wide); color: var(--nexacore-text-tertiary); }
.footer .nexacore-doc-fingerprint { color: color-mix(in srgb, var(--nexacore-text-inverse) 60%, transparent); }

/* In the petrol footer the federated ring should read in cream */
.footer .nav__brand { color: var(--nexacore-text-inverse); }

/* ---------- Utilities ------------------------------------- */
.lead { font-size: var(--nexacore-text-lg); color: var(--nexacore-text-secondary); }
.mt-0 { margin-top: 0; } .mb-0 { margin-bottom: 0; }
.flow > * + * { margin-top: 1.1rem; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

/* ============================================================
   ADDENDUM — diagrams, figures, motion, ncScript playground
   ============================================================ */

/* ---------- Scroll-reveal (progressive enhancement) -------- */
/* Hidden state applies only when JS is active (html.js), so the
   page is fully readable with JavaScript disabled. */
html.js .reveal { opacity: 0; transform: translateY(16px); transition: opacity .55s ease, transform .55s ease; will-change: opacity, transform; }
html.js .reveal.is-visible { opacity: 1; transform: none; }
html.js .reveal-stagger > * { opacity: 0; transform: translateY(16px); transition: opacity .5s ease, transform .5s ease; }
html.js .reveal-stagger.is-visible > * { opacity: 1; transform: none; }
html.js .reveal-stagger.is-visible > *:nth-child(2) { transition-delay: .07s; }
html.js .reveal-stagger.is-visible > *:nth-child(3) { transition-delay: .14s; }
html.js .reveal-stagger.is-visible > *:nth-child(4) { transition-delay: .21s; }
html.js .reveal-stagger.is-visible > *:nth-child(5) { transition-delay: .28s; }
html.js .reveal-stagger.is-visible > *:nth-child(6) { transition-delay: .35s; }
@media (prefers-reduced-motion: reduce) {
  html.js .reveal, html.js .reveal-stagger > * { opacity: 1 !important; transform: none !important; transition: none !important; }
}

/* ---------- Figures & diagrams ----------------------------- */
.figure { margin: clamp(1.5rem, 4vw, 2.5rem) 0; }
.figure img { display: block; width: 100%; height: auto; border: 1px solid var(--nexacore-border-default); border-radius: var(--nexacore-radius); }
.figure figcaption { font-family: var(--nexacore-font-mono); font-size: var(--nexacore-text-xs); letter-spacing: var(--nexacore-tracking-wide); color: var(--nexacore-text-tertiary); margin-top: .7rem; }
.diagram { background: var(--nexacore-bg-surface); border: 1px solid var(--nexacore-border-default); border-radius: var(--nexacore-radius); padding: clamp(1.1rem, 3vw, 2rem); overflow: hidden; }
.diagram svg { display: block; width: 100%; height: auto; }
.diagram--inset { background: var(--nexacore-bg-surface-2); }
.diagram-label { font-family: var(--nexacore-font-mono); font-size: var(--nexacore-text-xs); letter-spacing: var(--nexacore-tracking-wide); text-transform: uppercase; fill: var(--nexacore-text-secondary); }
.diagram-title { font-family: var(--nexacore-font-body); font-weight: 600; fill: var(--nexacore-text-primary); }
.diagram-sub { font-family: var(--nexacore-font-mono); fill: var(--nexacore-text-tertiary); }
.d-box { fill: var(--nexacore-bg-surface); stroke: var(--nexacore-border-strong); }
.d-box-2 { fill: var(--nexacore-bg-surface-2); stroke: var(--nexacore-border-default); }
.d-petrol { fill: var(--nexacore-petrol-500); }
.d-petrol-soft { fill: var(--nexacore-petrol-50); stroke: var(--nexacore-border-accent); }
.d-stroke { stroke: var(--nexacore-rule); fill: none; }
.d-stroke-strong { stroke: var(--nexacore-petrol-400); fill: none; }
.d-anchor { fill: var(--nexacore-brick-500); }
.d-text { font-family: var(--nexacore-font-body); fill: var(--nexacore-text-primary); }
.d-text-mono { font-family: var(--nexacore-font-mono); fill: var(--nexacore-text-secondary); }
.d-text-on-petrol { fill: var(--nexacore-cream-300); }

/* ---------- Animated federated-mesh (hero) ----------------- */
.mesh-hero { width: min(360px, 78%); height: auto; }
.mesh-hero .ml { stroke: var(--nexacore-petrol-300); stroke-width: 1.25; fill: none; }
.mesh-hero .mn { fill: var(--nexacore-petrol-500); }
.mesh-hero .mring { fill: none; stroke: var(--nexacore-petrol-200); stroke-width: 1; }
.mesh-hero .manchor { fill: var(--nexacore-brick-500); }
@media (prefers-reduced-motion: no-preference) {
  .mesh-hero .ml { stroke-dasharray: 1; stroke-dashoffset: 1; animation: mesh-draw 1.4s ease forwards; }
  .mesh-hero .mn { opacity: 0; animation: mesh-pop .5s ease forwards; }
  .mesh-hero .mring { stroke-dasharray: 1; stroke-dashoffset: 1; animation: mesh-draw 2.2s ease forwards; }
  .mesh-hero .manchor { transform-origin: center; opacity: 0; animation: mesh-pop .6s ease .9s forwards; }
  @keyframes mesh-draw { to { stroke-dashoffset: 0; } }
  @keyframes mesh-pop { to { opacity: 1; } }
}

/* ---------- ncScript playground -------------------------- */
.oms-pg { margin: 1.5rem 0 0.5rem; }
.oms-pg__examples { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: .85rem; }
.oms-ex {
  font-family: var(--nexacore-font-mono); font-size: var(--nexacore-text-xs); letter-spacing: .02em;
  background: var(--nexacore-bg-surface); color: var(--nexacore-text-secondary);
  border: 1px solid var(--nexacore-border-default); border-radius: 999px;
  padding: .35rem .8rem; cursor: pointer; white-space: nowrap;
}
.oms-ex:hover { color: var(--nexacore-text-accent); border-color: var(--nexacore-border-accent); }
.oms-ex[aria-pressed="true"] { background: var(--nexacore-petrol-500); color: var(--nexacore-cream-300); border-color: var(--nexacore-petrol-500); }
.oms-pg__main { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; align-items: start; }
@media (max-width: 820px) { .oms-pg__main { grid-template-columns: 1fr; } }
.oms-pg__editor, .oms-pg__out { background: var(--nexacore-bg-code); border: 1px solid var(--nexacore-border-default); border-left: 3px solid var(--nexacore-border-accent); border-radius: var(--nexacore-radius); overflow: hidden; }
.oms-pg__code {
  display: block; width: 100%; box-sizing: border-box; resize: vertical; min-height: 17rem;
  border: 0; outline: none; background: transparent; color: var(--nexacore-text-primary);
  font-family: var(--nexacore-font-mono); font-size: .86rem; line-height: var(--nexacore-leading-relaxed);
  padding: 1rem 1.1rem; tab-size: 2;
}
.oms-pg__code:focus { box-shadow: inset 0 0 0 2px var(--nexacore-focus-ring); }
.oms-pg__actions { display: flex; gap: .5rem; padding: .65rem 1rem; border-top: 1px solid var(--nexacore-border-default); background: color-mix(in srgb, var(--nexacore-bg-code) 70%, var(--nexacore-bg-surface)); }
.oms-pg__actions .btn { min-height: 36px; padding: .45rem .9rem; }
.oms-pg__console { padding: 1rem 1.1rem; min-height: 13rem; font-family: var(--nexacore-font-mono); font-size: .84rem; line-height: var(--nexacore-leading-relaxed); white-space: pre-wrap; word-break: break-word; color: var(--nexacore-text-primary); }
.oms-cap { color: var(--nexacore-text-secondary); }
.oms-cap b { color: var(--nexacore-text-accent); font-weight: 600; }
.oms-print { color: var(--nexacore-text-primary); }
.oms-value { color: var(--nexacore-sage-700); }
.oms-err { color: var(--nexacore-brick-500); }
.oms-muted { color: var(--nexacore-text-tertiary); }
[data-nexacore-theme="dark"] .oms-value { color: var(--nexacore-sage-300); }
@media (prefers-color-scheme: dark) { :root:not([data-nexacore-theme="light"]) .oms-value { color: var(--nexacore-sage-300); } }
[data-nexacore-theme="dark"] .oms-err { color: var(--nexacore-brick-300); }
@media (prefers-color-scheme: dark) { :root:not([data-nexacore-theme="light"]) .oms-err { color: var(--nexacore-brick-300); } }
.oms-status-ok { color: var(--nexacore-sage-700); }
.oms-status-err { color: var(--nexacore-brick-500); }

/* ---------- ncScript guided tutorial --------------------- */
.oms-tut { margin: 1.5rem 0 0.5rem; }
.oms-tut__head { display: flex; flex-wrap: wrap; gap: .75rem 1rem; align-items: center; justify-content: space-between; margin-bottom: .85rem; }
.oms-tut__progress { display: flex; align-items: center; gap: .8rem; flex-wrap: wrap; }
.oms-tut__count { font-family: var(--nexacore-font-mono); font-size: var(--nexacore-text-xs); letter-spacing: var(--nexacore-tracking-wide); text-transform: uppercase; color: var(--nexacore-text-secondary); white-space: nowrap; }
.oms-tut__dots { display: inline-flex; gap: 5px; flex-wrap: wrap; }
.oms-tut__dot { width: 9px; height: 9px; padding: 0; border-radius: 50%; border: 1px solid var(--nexacore-border-strong); background: transparent; cursor: pointer; }
.oms-tut__dot:hover { border-color: var(--nexacore-border-accent); }
.oms-tut__dot[aria-current="true"] { background: var(--nexacore-petrol-500); border-color: var(--nexacore-petrol-500); }
.oms-tut__nav { display: flex; align-items: center; gap: .5rem; }
.oms-tut__btn { min-height: 36px; padding: .4rem .8rem; }
.oms-tut__btn:disabled { opacity: .4; cursor: not-allowed; }
.oms-tut__jump { font-family: var(--nexacore-font-body); font-size: var(--nexacore-text-sm); color: var(--nexacore-text-primary); background: var(--nexacore-bg-surface); border: 1px solid var(--nexacore-border-strong); border-radius: var(--nexacore-radius); padding: .4rem .5rem; max-width: 14rem; }
.oms-tut__lesson { background: var(--nexacore-bg-surface-2); border: 1px solid var(--nexacore-border-default); border-left: 3px solid var(--nexacore-border-accent); border-radius: var(--nexacore-radius); padding: 1rem 1.25rem; margin-bottom: 1rem; }
.oms-tut__lesson h4 { margin: 0 0 .4em; font-family: var(--nexacore-font-body); font-weight: 600; font-size: var(--nexacore-text-lg); color: var(--nexacore-text-accent); }
.oms-tut__prose { font-size: var(--nexacore-text-sm); color: var(--nexacore-text-secondary); line-height: var(--nexacore-leading-normal); max-width: 60ch; }
.oms-tut__prose code { background: var(--nexacore-bg-code); padding: .08em .35em; border-radius: 3px; font-size: .9em; color: var(--nexacore-text-accent); }

/* ---------- Print (Save as PDF) ---------------------------- */
@media print {
  .no-print { display: none !important; }
  :root, [data-nexacore-theme="dark"], [data-nexacore-theme="light"] {
    --nexacore-bg-canvas: #ffffff; --nexacore-bg-surface: #ffffff; --nexacore-bg-surface-2: #F8F0DA;
    --nexacore-bg-code: #F1F6F7; --nexacore-bg-inverse: #1F2421;
    --nexacore-text-primary: #1F2421; --nexacore-text-secondary: #3E423E; --nexacore-text-tertiary: #5E635E;
    --nexacore-text-accent: #0F4C5C; --nexacore-text-link: #0F4C5C; --nexacore-text-link-hover: #0A323C;
    --nexacore-border-default: #DCDEDC; --nexacore-border-strong: #888D88; --nexacore-border-accent: #6390A0; --nexacore-rule: #94B3BC;
    --code-keyword: #0C3E4B; --code-string: #587657; --code-comment: #5E635E; --code-number: #8F2519; --code-attr: #0A323C;
  }
  html, body { background: #fff !important; color: #1F2421 !important; }
  html.js .reveal, html.js .reveal-stagger > * { opacity: 1 !important; transform: none !important; }
  .section { padding-block: 0 !important; }
  .wrap { max-width: none !important; padding-inline: 0 !important; }
  .doc-layout { display: block !important; }
  a { text-decoration: none !important; }
  h1, h2, h3 { break-after: avoid; }
  .code, pre, .table-wrap, figure, .callout, tr { break-inside: avoid; }
  pre { white-space: pre-wrap; word-break: break-word; }
  @page { margin: 16mm 14mm; }
}

/* long manual TOC scrolls within the viewport */
.toc { max-height: calc(100vh - 96px); overflow-y: auto; }
