/* SPARC product site — shared primitives.
   Every value traces to the artboards in site/design/. Page-specific styles live in
   styles/pages/<page>.css; keep this file to primitives that recur across pages. */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}
a { color: inherit; }
img, svg { display: block; max-width: 100%; }
button, input, textarea, select { font: inherit; color: inherit; }
::selection { background: var(--accent); color: var(--on-accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }
.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;
}
.skip-link {
  position: absolute; left: 12px; top: -48px; z-index: 100;
  background: var(--accent); color: var(--on-accent); padding: 8px 14px;
  border-radius: var(--radius-sm); font-weight: 600; text-decoration: none;
}
.skip-link:focus { top: 12px; }

/* ---------- Layout ---------- */
.container { max-width: var(--container); margin: 0 auto; padding-left: var(--gutter); padding-right: var(--gutter); }
.section { padding: 104px 0; }
.section--tight { padding: 72px 0; }
.section--page { padding: 80px 0; }
.band { background: var(--surface-2); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.band--top { border-bottom: 0; }
.band--dark { background: #0B1017; }
.rule-top { border-top: 1px solid var(--border); }
.rule-bottom { border-bottom: 1px solid var(--border); }
.grid { display: grid; gap: 20px; }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--fill { grid-template-columns: repeat(auto-fill, minmax(248px, 1fr)); gap: 12px; }
.split { display: grid; grid-template-columns: var(--split, 0.9fr 1.1fr); gap: var(--split-gap, 56px); align-items: start; }
.split--center { align-items: center; }
.split > *, .grid > *, .hero__grid > * { min-width: 0; } /* fr tracks default to min-content — a wide mock must not steal the ratio */
.stack { display: flex; flex-direction: column; }
.stack > * + * { margin-top: var(--stack-gap, 14px); }
.row { display: flex; align-items: center; gap: 12px; }
.measure { max-width: var(--measure, 720px); }
.text-right { text-align: right; }

/* ---------- Hero ---------- */
.hero { background: var(--hero-bg); border-bottom: 1px solid var(--border); }
.hero__inner { padding-block: 92px 96px; }
.hero--page .hero__inner { padding-block: 76px 64px; }
.hero__grid { display: grid; grid-template-columns: 1.02fr 0.98fr; gap: 64px; align-items: center; }

/* ---------- Typography ---------- */
.eyebrow {
  font-size: 13px; font-weight: 600; color: var(--accent);
  letter-spacing: 0.04em; text-transform: uppercase; margin: 0 0 16px;
}
.eyebrow-row { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.eyebrow-row .eyebrow { margin: 0; }
.eyebrow--dot { display: inline-flex; align-items: center; gap: 9px; text-transform: none; letter-spacing: 0; font-weight: 500; margin-bottom: 22px; }
.t-hero { margin: 0; font-size: 58px; line-height: 1.05; letter-spacing: -0.025em; font-weight: 600; }
.t-page { margin: 0; font-size: 46px; line-height: 1.08; letter-spacing: -0.02em; font-weight: 600; }
.t-section { margin: 0; font-size: 38px; line-height: 1.12; letter-spacing: -0.02em; font-weight: 600; }
.t-section-sm { margin: 0; font-size: 34px; line-height: 1.12; letter-spacing: -0.02em; font-weight: 600; }
.t-block { margin: 0; font-size: 30px; line-height: 1.15; letter-spacing: -0.015em; font-weight: 600; }
.t-group { margin: 0; font-size: 26px; letter-spacing: -0.015em; font-weight: 600; }
.t-item { margin: 0; font-size: 22px; font-weight: 600; letter-spacing: -0.01em; }
.t-card { margin: 0; font-size: 20px; font-weight: 600; }
.t-card-sm { margin: 0; font-size: 17px; font-weight: 600; }
.lede { margin: 20px 0 0; font-size: 18px; line-height: 1.6; color: var(--text-2); }
.lede--hero { font-size: 18.5px; margin-top: 24px; max-width: 52ch; }
.lede--page { margin-top: 22px; max-width: 64ch; }
.lede--sm { font-size: 16.5px; margin-top: 18px; }
.body { margin: 0; font-size: 16px; line-height: 1.65; color: var(--text-2); }
.body + .body { margin-top: 14px; }
.copy { margin: 0; font-size: 15.5px; line-height: 1.6; color: var(--text-2); }
.copy-sm { margin: 0; font-size: 14.5px; line-height: 1.6; color: var(--text-2); }
.copy-xs { margin: 0; font-size: 14px; line-height: 1.55; color: var(--text-2); }
.note { margin: 0; font-size: 14px; line-height: 1.6; color: var(--text-3); }
.note--sm { font-size: 13px; line-height: 1.55; }
.aside { margin: 28px 0 0; font-size: 14.5px; line-height: 1.6; color: var(--text-3); max-width: 74ch; }
.aside a { color: var(--text-2); font-weight: 600; }
.mono { font-family: var(--font-mono); }
.kicker { font-family: var(--font-mono); font-size: 12px; color: var(--accent); margin: 0 0 12px; }
.index { font-family: var(--font-mono); font-size: 13px; color: var(--accent); }
.label-caps { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-3); margin: 0 0 6px; }
.label-caps--wide { font-family: var(--font-sans); font-size: 11px; font-weight: 600; letter-spacing: 0.08em; margin-bottom: 16px; }
.strong-muted { font-size: 13px; font-weight: 600; color: var(--text-3); }
.link-arrow { font-size: 15px; font-weight: 600; color: var(--accent); text-decoration: none; white-space: nowrap; }
.link-arrow--sm { font-size: 14px; }
.link-arrow:hover { text-decoration: underline; }
.link-inline { color: var(--text-2); font-weight: 600; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px; text-decoration: none; cursor: pointer;
  border: 1px solid transparent; border-radius: var(--radius-sm); font-weight: 600; font-size: 16px;
  padding: 14px 24px; transition: background .18s, border-color .18s, transform .18s;
}
.btn--primary { background: var(--accent); color: var(--on-accent); }
.btn--primary:hover { background: var(--accent-hover); transform: translateY(-1px); }
.btn--secondary { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn--secondary:hover { border-color: var(--accent); transform: translateY(-1px); }
.btn--inverse { background: var(--on-accent); color: var(--accent); padding: 14px 26px; }
.btn--inverse:hover { transform: translateY(-1px); }
.btn--sm { padding: 9px 18px; font-size: 14.5px; }
.btn-row { display: flex; gap: 13px; flex-wrap: wrap; margin-top: 34px; }

/* ---------- Cards ---------- */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; }
.card--lg { padding: 34px; }
.card--md { padding: 30px; }
.card--sm { padding: 26px; }
.card--xs { padding: 24px; }
.card--tile { padding: 18px 20px; border-radius: var(--radius-sm); }
.card--tinted { background: var(--surface-2); }
.card--ghost { background: color-mix(in srgb, var(--surface) 55%, transparent); border-radius: var(--radius-sm); }
.card--accent { border-color: color-mix(in srgb, var(--accent) 32%, var(--border)); box-shadow: 0 20px 50px -38px color-mix(in srgb, var(--accent) 70%, transparent); }
.card--raised { border-radius: calc(var(--radius) + 4px); box-shadow: 0 40px 80px -48px rgba(15, 23, 42, 0.45); overflow: hidden; }
.card--soft { border-radius: calc(var(--radius) + 4px); }
.card__head { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.card__head .t-card { flex: 1; }
.card__tag { font-family: var(--font-mono); font-size: 12px; color: var(--text-3); }
.card__limits { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--border); }
.card__limits p { margin: 0; font-size: 13.5px; line-height: 1.55; color: var(--text-2); }
.card__title-row { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; flex-wrap: wrap; }
.tile__title { font-size: 15px; font-weight: 600; margin-bottom: 4px; }
.tile__body { font-size: 13.5px; line-height: 1.5; color: var(--text-2); }

/* Panel: framed surface with a header row (mocks, tables, invariants) */
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.panel__bar { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 14px 20px; border-bottom: 1px solid var(--border); }
.panel__bar-title { font-size: 12px; font-weight: 600; color: var(--text-2); }
.panel__row { padding: 14px 20px; border-bottom: 1px solid var(--border); }
.panel__row:last-child { border-bottom: 0; }

/* ---------- Chips, dots, legends ---------- */
.chip {
  display: inline-flex; align-items: center; gap: 6px; border-radius: 999px; white-space: nowrap;
  font-size: 10.5px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; padding: 3px 9px; flex: none;
}
.chip--build { color: var(--warn-text); border: 1px solid color-mix(in srgb, var(--warn) 55%, transparent); }
.theme-dark .chip--build, .band--dark .chip--build { color: var(--warn-dark-text); border-color: color-mix(in srgb, var(--warn-dark) 55%, transparent); }
.chip--roadmap { color: var(--text-2); background: color-mix(in srgb, var(--text-3) 18%, transparent); }
.theme-dark .chip--roadmap { background: color-mix(in srgb, var(--text-3) 22%, transparent); }
/* Status pills (data states) — no letter-spacing, sentence/upper case as authored */
.pill { display: inline-flex; align-items: center; gap: 6px; border-radius: 999px; font-size: 11px; font-weight: 600; padding: 3px 9px; white-space: nowrap; }
.pill--ok { color: var(--ok-text); background: color-mix(in srgb, var(--ok) 16%, transparent); }
.pill--warn { color: var(--warn-text); background: color-mix(in srgb, var(--warn) 18%, transparent); }
.pill--muted { color: var(--text-3); background: color-mix(in srgb, var(--text-3) 16%, transparent); }
.pill--lg { padding: 4px 9px; }
.dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; flex: none; background: var(--text-3); }
.dot--ok { background: var(--ok); }
.dot--accent { background: var(--accent); }
.dot--muted { background: var(--text-3); }
.dot--md { width: 8px; height: 8px; }
.dot--lg { width: 9px; height: 9px; }
.dot--xs { width: 6px; height: 6px; }
.legend { display: flex; gap: 22px; flex-wrap: wrap; margin-top: 26px; }
.legend__item { display: inline-flex; align-items: center; gap: 8px; font-size: 13.5px; color: var(--text-2); }

/* ---------- Lists ---------- */
.dot-list { display: flex; flex-direction: column; gap: 13px; margin: 0; padding: 0; list-style: none; }
.dot-list li { display: flex; align-items: center; gap: 12px; font-size: 15px; color: var(--text-2); }
.dot-list--strong li { color: var(--text); }
.dot-list--top li { align-items: flex-start; }
.dot-list--top .dot { margin-top: 7px; }
.check-list { display: flex; flex-direction: column; gap: 14px; margin: 30px 0 0; padding: 0; list-style: none; }
.check-list li { display: flex; align-items: flex-start; gap: 13px; font-size: 15.5px; color: var(--text); }
.check-list svg { flex: none; margin-top: 1px; }
.check-list--ruled { gap: 0; margin: 0; }
.check-list--ruled li { padding: 16px 0; border-top: 1px solid var(--border); font-size: 15px; line-height: 1.55; }
.check-list--ruled li:last-child { border-bottom: 1px solid var(--border); }
.rule-list { display: flex; flex-direction: column; margin: 0; padding: 0; list-style: none; }
.rule-list > li { border-top: 1px solid var(--border); }
.rule-list > li:last-child { border-bottom: 1px solid var(--border); }
.rule-list--open > li:last-child { border-bottom: 0; }
.numbered { display: grid; grid-template-columns: 34px 1fr; gap: 18px; padding: 20px 0; }
.numbered .index { font-size: 12.5px; padding-top: 3px; }
.numbered__title { font-size: 16.5px; font-weight: 600; margin-bottom: 6px; }
.numbered__title-row { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; }
.numbered p { margin: 0; font-size: 15px; line-height: 1.55; color: var(--text-2); }

/* Roadmap row (label + description) */
.roadmap-row { display: flex; align-items: baseline; gap: 12px; padding: 14px 0; border-bottom: 1px solid var(--border); }
.roadmap-row__label { font-size: 15px; font-weight: 600; white-space: nowrap; }
.roadmap-row__body { font-size: 13.5px; color: var(--text-2); }

/* Callout with chip (Evidence roadmap notes) */
.callout { display: flex; align-items: center; gap: 12px; margin-top: 18px; padding: 14px 18px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); font-size: 14px; color: var(--text-2); }

/* ---------- Data-ish blocks ---------- */
.code-tag { display: inline-block; font-family: var(--font-mono); font-size: 12.5px; color: var(--accent); margin-bottom: 16px; padding: 9px 12px; background: color-mix(in srgb, var(--accent) 7%, transparent); border-radius: var(--radius-sm); }
.code-inline { font-family: var(--font-mono); font-size: 0.875em; }
.table-head { font-size: 12px; color: var(--text-3); }

/* ---------- CTA panel ---------- */
.cta-panel { background: var(--accent); border-radius: calc(var(--radius) + 6px); padding: 72px 56px; text-align: center; position: relative; overflow: hidden; }
.cta-panel h2 { margin: 0 auto; font-size: 40px; line-height: 1.1; letter-spacing: -0.02em; font-weight: 600; color: var(--on-accent); max-width: 20ch; }
.cta-panel p { margin: 18px auto 0; font-size: 18px; line-height: 1.6; color: color-mix(in srgb, var(--on-accent) 82%, transparent); max-width: 52ch; }
.cta-panel .btn-row { justify-content: center; }

/* ---------- Site chrome: header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  -webkit-backdrop-filter: saturate(150%) blur(12px); backdrop-filter: saturate(150%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.site-header__inner { height: var(--nav-h); display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; color: var(--text); }
.brand__mark { width: 26px; height: 26px; }
.brand__name { font-weight: 700; font-size: 18px; letter-spacing: 0.01em; }
.site-nav { display: flex; align-items: center; gap: 26px; }
.site-nav a { text-decoration: none; color: var(--text-2); font-size: 14.5px; transition: color .16s; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--text); }
.site-nav a[aria-current="page"] { font-weight: 600; }
.site-actions { display: flex; align-items: center; gap: 18px; }
.site-actions__signin { text-decoration: none; color: var(--text-2); font-size: 14.5px; transition: color .16s; }
.site-actions__signin:hover { color: var(--text); }
.nav-toggle { display: none; background: none; border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 8px 10px; cursor: pointer; color: var(--text); }
.nav-toggle svg { width: 20px; height: 20px; }

/* ---------- Site chrome: footer ---------- */
.site-footer { border-top: 1px solid var(--border); background: var(--bg); color: var(--text); }
.site-footer__grid { padding-block: 56px 40px; display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 32px; }
.site-footer__brand { display: flex; align-items: center; gap: 11px; margin-bottom: 16px; }
.site-footer__brand svg { width: 24px; height: 24px; }
.site-footer__brand span { font-weight: 700; font-size: 16px; }
.site-footer__blurb { margin: 0; font-size: 14px; line-height: 1.6; color: var(--text-2); max-width: 34ch; }
.site-footer__heading { font-size: 12px; font-weight: 600; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 16px; }
.site-footer__links { display: flex; flex-direction: column; gap: 11px; font-size: 14px; color: var(--text-2); margin: 0; padding: 0; list-style: none; }
.site-footer__links a { text-decoration: none; transition: color .16s; }
.site-footer__links a:hover { color: var(--text); }
.site-footer__legal { padding-block: 20px 48px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 13px; color: var(--text-3); }
.site-footer__legal a { color: var(--text-2); font-weight: 600; text-decoration: none; }
.site-footer__legal a:hover { text-decoration: underline; }

/* ---------- Reveal-on-scroll (JS adds .reveal-pending; no JS = fully visible) ---------- */
.reveal-pending { opacity: 0; transform: translateY(16px); }
.reveal-in { opacity: 1; transform: none; transition: opacity .65s cubic-bezier(.2,.6,.2,1), transform .65s cubic-bezier(.2,.6,.2,1); }
@media (prefers-reduced-motion: reduce) {
  .reveal-pending { opacity: 1; transform: none; }
  .reveal-in { transition: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .t-hero { font-size: 48px; }
  .t-page { font-size: 40px; }
  .t-section { font-size: 34px; }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .site-nav { gap: 18px; }
}
@media (max-width: 900px) {
  .hero__grid, .split { grid-template-columns: 1fr; gap: 40px; }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .site-nav { display: none; position: absolute; left: 0; right: 0; top: var(--nav-h); flex-direction: column; align-items: stretch; gap: 0; background: var(--bg); border-bottom: 1px solid var(--border); padding: 8px 0 12px; }
  .site-nav a { padding: 12px var(--gutter); font-size: 16px; }
  .site-header.is-open .site-nav { display: flex; }
  .site-actions__signin { display: none; }
  .nav-toggle { display: inline-flex; }
  .site-footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .section { padding: 72px 0; }
  .section--tight, .section--page { padding: 56px 0; }
  .hero__inner { padding-block: 64px 64px; }
  .hero--page .hero__inner { padding-block: 56px 44px; }
  .t-hero { font-size: 38px; }
  .t-page { font-size: 32px; }
  .t-section, .t-section-sm { font-size: 28px; }
  .t-block { font-size: 25px; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .site-footer__grid { grid-template-columns: 1fr; }
  .cta-panel { padding: 48px 24px; }
  .cta-panel h2 { font-size: 30px; }
  .card--lg { padding: 26px; }
  .roadmap-row { flex-direction: column; gap: 4px; align-items: flex-start; }
  .roadmap-row__label { white-space: normal; }
}