/* =============================================================
   Showcase — core stylesheet
   Language: editorial-technical. Warm paper, ink type, hairlines,
   one accent. No glass, no glow, no purple, no gradients-as-decoration.
   ============================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--t-body);
  line-height: 1.55;
  font-feature-settings: 'kern' 1, 'liga' 1, 'calt' 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, svg, video, canvas { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }

::selection { background: var(--signal); color: var(--paper-raised); }

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}

/* -------------------------------------------------------------
   TYPE SCALE
   ---------------------------------------------------------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: var(--track-mega);
  line-height: 0.94;
  margin: 0;
  text-wrap: balance;
}
h1 { font-size: var(--t-h1); }
h2 { font-size: var(--t-h2); }
h3 { font-size: var(--t-h3); letter-spacing: var(--track-tight); line-height: 1.04; }

p { margin: 0 0 var(--s-5); max-width: var(--measure); text-wrap: pretty; }
p:last-child { margin-bottom: 0; }

.lead { font-size: var(--t-lead); line-height: 1.42; color: var(--ink-muted); max-width: 54ch; }

/* The mono label is the through-line of the whole system: it marks
   anything measured, indexed, or machine-generated. */
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--t-micro);
  font-weight: 500;
  letter-spacing: var(--track-caps);
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 var(--s-4);
}
.eyebrow--signal { color: var(--signal); }

.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* -------------------------------------------------------------
   LAYOUT
   ---------------------------------------------------------- */
.page { width: 100%; padding-inline: var(--gutter); }
.wrap { max-width: var(--page-max); margin-inline: auto; }
.wrap--measure { max-width: 62rem; margin-inline: auto; }

.section { padding-block: var(--s-10); position: relative; }
.section--tight { padding-block: var(--s-9); }
.section--sunk { background: var(--paper-sunk); }

/* A hairline rule that runs the page width — the only divider used. */
.rule { height: 1px; background: var(--ink-hairline); border: 0; margin: 0; }

/* -------------------------------------------------------------
   NAV — floating pill, detached from the top. Not a full-width bar.
   ---------------------------------------------------------- */
.nav {
  position: sticky; top: var(--s-4); z-index: var(--z-sticky);
  padding-inline: var(--gutter);
  pointer-events: none;
}
.nav__inner {
  pointer-events: auto;
  max-width: var(--page-max);
  margin-inline: auto;
  display: flex; align-items: center; gap: var(--s-4);
  padding: 0.45rem 0.5rem 0.45rem 1rem;
  background: color-mix(in oklab, var(--paper) 86%, transparent);
  border: 1px solid var(--ink-hairline);
  border-radius: 999px;
  transition: background var(--t-fast) var(--ease-out-expo),
              border-color var(--t-fast) var(--ease-out-expo);
}
.nav__scrolled .nav__inner { border-color: color-mix(in oklab, var(--ink) 22%, transparent); }

.nav__mark {
  font-family: var(--font-mono); font-size: var(--t-fine);
  letter-spacing: 0.04em; margin-right: auto; white-space: nowrap;
}
.nav__links {
  display: flex; align-items: center; gap: 0.15rem;
  list-style: none; margin: 0; padding: 0;
}
.nav__links li { margin: 0; }
.nav__link {
  font-size: var(--t-small); color: var(--ink-muted);
  padding: 0.4rem 0.75rem; border-radius: 999px;
  transition: color var(--t-fast) var(--ease-out-expo),
              background var(--t-fast) var(--ease-out-expo);
}
.nav__link:hover { color: var(--ink); background: var(--paper-sunk); }
.nav__link[aria-current="page"] { color: var(--ink); }
.nav__link[aria-current="page"]::before {
  content: ''; display: inline-block; width: 4px; height: 4px;
  border-radius: 50%; background: var(--signal);
  margin-right: 0.5rem; vertical-align: middle;
}

/* Hamburger: lines morph into an X via transform, never vanish. */
.nav__toggle {
  display: none; position: relative; width: 34px; height: 34px;
  background: none; border: 0; cursor: pointer; padding: 0;
}
.nav__toggle span {
  position: absolute; left: 8px; width: 18px; height: 1.25px;
  background: var(--ink);
  transition: transform var(--t-mid) var(--ease-out-expo),
              opacity var(--t-fast) linear;
}
.nav__toggle span:nth-child(1) { top: 13px; }
.nav__toggle span:nth-child(2) { top: 17px; }
.nav__toggle span:nth-child(3) { top: 21px; }
[aria-expanded="true"] .nav__toggle span:nth-child(1) { transform: translateY(4px) rotate(45deg); }
[aria-expanded="true"] .nav__toggle span:nth-child(2) { opacity: 0; }
[aria-expanded="true"] .nav__toggle span:nth-child(3) { transform: translateY(-4px) rotate(-45deg); }

/* Mobile overlay: staggered mask reveal, not a plain fade. */
.nav__overlay {
  position: fixed; inset: 0; z-index: var(--z-overlay);
  background: color-mix(in oklab, var(--paper) 96%, transparent);
  display: none; flex-direction: column; justify-content: center;
  padding: var(--gutter);
}
.nav__overlay[data-open="true"] { display: flex; }
.nav__overlay a {
  font-family: var(--font-display); font-size: clamp(2rem, 11vw, 3.5rem);
  letter-spacing: var(--track-mega); line-height: 1.1;
  padding-block: var(--s-3);
  border-bottom: 1px solid var(--ink-hairline);
  opacity: 0; transform: translateY(1.5rem);
  animation: nav-rise var(--t-slow) var(--ease-out-expo) forwards;
}
.nav__overlay a:nth-child(1) { animation-delay: 60ms; }
.nav__overlay a:nth-child(2) { animation-delay: 110ms; }
.nav__overlay a:nth-child(3) { animation-delay: 160ms; }
.nav__overlay a:nth-child(4) { animation-delay: 210ms; }
@keyframes nav-rise { to { opacity: 1; transform: translateY(0); } }
@media (prefers-reduced-motion: reduce) {
  .nav__overlay a { animation: none; opacity: 1; transform: none; }
}

@media (max-width: 860px) {
  .nav__links { display: none; }
  .nav__toggle { display: block; }
}

/* -------------------------------------------------------------
   BUTTONS — label + arrow in its own well. Physical press.
   ---------------------------------------------------------- */
.pill {
  display: inline-flex; align-items: center; gap: 0.6rem;
  padding: 0.5rem 0.5rem 0.5rem 1.1rem;
  border: 1px solid var(--ink);
  border-radius: 999px;
  font-size: var(--t-small); font-weight: 500;
  white-space: nowrap;
  transition: background var(--t-fast) var(--ease-out-expo),
              color var(--t-fast) var(--ease-out-expo),
              transform var(--t-fast) var(--ease-out-expo),
              border-color var(--t-fast) var(--ease-out-expo);
}
.pill-label { line-height: 1; }
.pill-arrow {
  display: grid; place-items: center;
  width: 1.75rem; height: 1.75rem; border-radius: 999px;
  background: var(--ink); color: var(--paper);
  font-size: 0.85rem; line-height: 1;
  transition: transform var(--t-mid) var(--ease-out-expo),
              background var(--t-fast) var(--ease-out-expo);
}
.pill:hover { background: var(--signal); border-color: var(--signal); color: var(--paper-raised); }
.pill:hover .pill-arrow { background: var(--paper-raised); color: var(--signal); transform: translate(2px, -2px) scale(1.06); }
.pill:active { transform: scale(0.985); }
.pill--ghost { border-color: var(--ink-hairline); }
.pill--ghost:hover { background: var(--ink); border-color: var(--ink); }

.link-inline {
  font-size: var(--t-small);
  border-bottom: 1px solid var(--ink-hairline);
  padding-bottom: 1px;
  transition: color var(--t-fast) var(--ease-out-expo),
              border-color var(--t-fast) var(--ease-out-expo);
}
.link-inline:hover { color: var(--signal); border-color: var(--signal); }

/* -------------------------------------------------------------
   HERO — anti-center bias. Asymmetric: type left, instrument right.
   ---------------------------------------------------------- */
.hero { padding-block: var(--s-9) var(--s-10); }
/* On short viewports the macro scale would push the CTAs below the fold. */
@media (max-height: 900px), (max-width: 768px) {
  .hero { padding-block: var(--s-7) var(--s-8); }
  .section { padding-block: var(--s-8); }
}
.hero__grid {
  display: grid; gap: var(--s-7);
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  align-items: end;
}
@media (max-width: 1000px) { .hero__grid { grid-template-columns: 1fr; align-items: start; } }

/* Headline is capped in BOTH size and measure so it can never wrap past
   three lines or push the CTAs below the fold. */
.hero__title {
  font-size: var(--t-display);
  margin-bottom: var(--s-5);
  max-width: 20ch;
  text-wrap: balance;
}
.hero__sub { font-size: var(--t-lead); color: var(--ink-muted); max-width: 42ch; }
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--s-3); margin-top: var(--s-6); }

.hero__meta {
  display: grid; gap: var(--s-4);
  border-left: 1px solid var(--ink-hairline);
  padding-left: var(--s-5);
}
@media (max-width: 1000px) {
  .hero__meta { border-left: 0; padding-left: 0; border-top: 1px solid var(--ink-hairline); padding-top: var(--s-5); }
}

dl.meta { margin: 0; }
.meta-k {
  font-family: var(--font-mono); font-size: var(--t-micro);
  letter-spacing: var(--track-caps); text-transform: uppercase;
  color: var(--ink-faint); margin: 0 0 var(--s-1);
}
.meta-v { margin: 0 0 var(--s-4); font-size: var(--t-small); }

/* -------------------------------------------------------------
   TAGS, METRICS, PROVENANCE
   ---------------------------------------------------------- */
.tagrow { display: flex; flex-wrap: wrap; gap: var(--s-2); list-style: none; margin: 0; padding: 0; }
.tag {
  font-family: var(--font-mono); font-size: var(--t-micro);
  letter-spacing: 0.04em;
  padding: 0.25rem 0.55rem;
  border: 1px solid var(--ink-hairline);
  border-radius: var(--r-sm);
  color: var(--ink-muted);
  background: var(--paper);
}
.tag:hover { border-color: var(--ink); color: var(--ink); }

.metrics { display: flex; flex-wrap: wrap; gap: var(--s-7); }
.metric { display: flex; flex-direction: column; gap: 0.2rem; }
.metric-v {
  font-family: var(--font-display); font-size: var(--t-h3);
  letter-spacing: var(--track-tight); line-height: 1;
  font-variant-numeric: tabular-nums;
}
.metric-l {
  font-family: var(--font-mono); font-size: var(--t-micro);
  letter-spacing: var(--track-caps); text-transform: uppercase; color: var(--ink-faint);
}
.metric-verified {
  font-family: var(--font-mono); font-size: 9px; letter-spacing: var(--track-caps);
  text-transform: uppercase; color: var(--ok);
  border: 1px solid color-mix(in oklab, var(--ok) 40%, transparent);
  border-radius: 999px; padding: 0.1rem 0.4rem; align-self: flex-start; margin-top: 0.2rem;
}

.provenance {
  display: inline-flex; align-items: center; gap: 0.45rem;
  font-family: var(--font-mono); font-size: var(--t-micro);
  letter-spacing: 0.06em; color: var(--ink-faint); margin: 0;
}
.provenance .dot {
  width: 5px; height: 5px; border-radius: 50%; background: var(--ok);
  box-shadow: 0 0 0 0 color-mix(in oklab, var(--ok) 60%, transparent);
  animation: pulse 2.4s var(--ease-out-expo) infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 color-mix(in oklab, var(--ok) 55%, transparent); }
  70%  { box-shadow: 0 0 0 7px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}
@media (prefers-reduced-motion: reduce) { .provenance .dot { animation: none; } }

/* -------------------------------------------------------------
   ASYMMETRIC GRID — varied spans, never three equal cards.
   ---------------------------------------------------------- */
.grid-12 { display: grid; grid-template-columns: repeat(12, 1fr); gap: var(--s-5); }
.grid-12 > * { grid-column: span 12; }
@media (min-width: 900px) {
  .span-7 { grid-column: span 7; }
  .span-5 { grid-column: span 5; }
  .span-8 { grid-column: span 8; }
  .span-4 { grid-column: span 4; }
  .span-6 { grid-column: span 6; }
}

/* -------------------------------------------------------------
   CARD — hairline + whitespace. No fill, no shadow, no radius
   theatre. Cards exist only where elevation communicates hierarchy.
   ---------------------------------------------------------- */
.card {
  border: 1px solid var(--ink-hairline);
  border-radius: var(--r-lg);
  padding: var(--s-5);
  background: var(--paper);
  transition: border-color var(--t-mid) var(--ease-out-expo),
              transform var(--t-mid) var(--ease-out-expo);
}
.card:hover { border-color: var(--ink); }
.card--interactive:hover { transform: translateY(-2px); }
.card__body { padding: var(--s-4) 0 0; color: var(--ink-muted); font-size: var(--t-small); }

.media {
  position: relative; overflow: hidden;
  border-radius: var(--r-md);
  background: var(--paper-sunk);
  aspect-ratio: 16 / 10;
}
.media img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--t-slow) var(--ease-out-expo); }
.card:hover .media img { transform: scale(1.02); }

/* -------------------------------------------------------------
   INSTRUMENT SHELL — the "operable demo" frame. Double bezel:
   outer tray + inner core, concentric radii, single hairline.
   ---------------------------------------------------------- */
.instrument {
  border: 1px solid var(--ink-hairline);
  border-radius: var(--r-lg);
  padding: 0.4rem;
  background: var(--paper-sunk);
}
.instrument__core {
  background: var(--paper-raised);
  border: 1px solid var(--ink-hairline);
  border-radius: calc(var(--r-lg) - 3px);
  overflow: hidden;
}
.instrument__bar {
  display: flex; align-items: center; justify-content: space-between; gap: var(--s-4);
  padding: 0.6rem 0.85rem;
  border-bottom: 1px solid var(--ink-hairline);
  background: var(--paper);
}
.instrument__title {
  font-family: var(--font-mono); font-size: var(--t-micro);
  letter-spacing: var(--track-caps); text-transform: uppercase; color: var(--ink-faint);
}
.instrument__body { padding: var(--s-4); }
.instrument__body--flush { padding: 0; }
.instrument__foot {
  display: flex; align-items: center; justify-content: space-between; gap: var(--s-3);
  padding: 0.6rem 0.85rem; border-top: 1px solid var(--ink-hairline);
  font-family: var(--font-mono); font-size: var(--t-micro); color: var(--ink-faint);
}

/* -------------------------------------------------------------
   FORMS — label above, helper, error below. Never placeholder-as-label.
   ---------------------------------------------------------- */
.field { display: grid; gap: var(--s-2); margin-bottom: var(--s-5); }
.field label {
  font-family: var(--font-mono); font-size: var(--t-micro);
  letter-spacing: var(--track-caps); text-transform: uppercase; color: var(--ink-muted);
}
.field .hint { font-size: var(--t-fine); color: var(--ink-faint); }
.field input, .field textarea, .field select {
  font: inherit; font-size: var(--t-small);
  padding: 0.7rem 0.85rem;
  background: var(--paper-raised);
  border: 1px solid var(--ink-hairline);
  border-radius: var(--r-md);
  color: var(--ink);
  transition: border-color var(--t-fast) var(--ease-out-expo),
              box-shadow var(--t-fast) var(--ease-out-expo);
}
.field textarea { min-height: 8rem; resize: vertical; }
.field input:hover, .field textarea:hover { border-color: color-mix(in oklab, var(--ink) 35%, transparent); }
.field input:focus, .field textarea:focus {
  outline: none;
  border-color: var(--ink);
  box-shadow: 0 0 0 3px var(--signal-wash);
}
.field input::placeholder, .field textarea::placeholder { color: var(--ink-faint); }
.field .error { font-size: var(--t-fine); color: var(--stop); }
.field[data-invalid="true"] input, .field[data-invalid="true"] textarea { border-color: var(--stop); }

/* -------------------------------------------------------------
   FOOTER
   ---------------------------------------------------------- */
.footer { padding-block: var(--s-8) var(--s-7); border-top: 1px solid var(--ink-hairline); }
.footer__grid { display: flex; flex-wrap: wrap; gap: var(--s-6); align-items: baseline; justify-content: space-between; }
.footer__note { font-size: var(--t-fine); color: var(--ink-faint); }

/* -------------------------------------------------------------
   FILM GRAIN — fixed, pointer-events none, never on scroll containers.
   Extremely low opacity: texture, not decoration.
   ---------------------------------------------------------- */
.grain {
  position: fixed; inset: 0; z-index: var(--z-grain);
  pointer-events: none; opacity: 0.028;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* -------------------------------------------------------------
   SCROLL REVEAL — opacity + transform only, GPU-safe. JS adds the
   initial state so a no-JS visitor still sees all content.
   ---------------------------------------------------------- */
[data-reveal] { will-change: opacity, transform; }
.no-js [data-reveal] { opacity: 1 !important; transform: none !important; }

@media print {
  .nav, .grain, .instrument__bar, .footer { display: none; }
  body { background: #fff; color: #000; }
}

/* -------------------------------------------------------------
   UTILITIES — few, and each earns its place.
   ---------------------------------------------------------- */
.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;
}
.sr-only:focus-visible {
  position: fixed; top: var(--s-4); left: var(--s-4); z-index: calc(var(--z-overlay) + 1);
  width: auto; height: auto; clip: auto; padding: 0.6rem 1rem;
  background: var(--ink); color: var(--paper); border-radius: var(--r-md);
}

.progress-rail {
  position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: var(--z-sticky);
  pointer-events: none;
}
.progress-rail > span {
  display: block; height: 100%; width: 100%;
  background: var(--signal);
  transform: scaleX(0); transform-origin: 0 50%;
  will-change: transform;
}

.nav__overlay-list { display: contents; }

/* Section index list — the "registry" that replaces a feature grid. */
.registry { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--ink-hairline); }
.registry__row {
  border-bottom: 1px solid var(--ink-hairline);
}
.registry__link {
  display: grid; align-items: baseline; gap: var(--s-4);
  grid-template-columns: auto minmax(0, 1fr) auto;
  padding: var(--s-5) 0;
  transition: padding-left var(--t-mid) var(--ease-out-expo),
              color var(--t-fast) var(--ease-out-expo);
}
@media (min-width: 900px) { .registry__link { grid-template-columns: 5rem minmax(0, 1fr) minmax(0, 22rem) auto; } }
.registry__link:hover { padding-left: var(--s-3); color: var(--signal); }
.registry__idx {
  font-family: var(--font-mono); font-size: var(--t-fine);
  color: var(--ink-faint); font-variant-numeric: tabular-nums;
}
.registry__name { font-family: var(--font-display); font-size: var(--t-h3); letter-spacing: var(--track-tight); line-height: 1; }
.registry__desc { color: var(--ink-muted); font-size: var(--t-small); }
.registry__arrow { font-family: var(--font-mono); color: var(--ink-faint); transition: transform var(--t-mid) var(--ease-out-expo), color var(--t-fast) var(--ease-out-expo); }
.registry__link:hover .registry__arrow { transform: translate(3px, -3px); color: var(--signal); }
@media (max-width: 900px) { .registry__desc { display: none; } }

/* Sticky stack: real pinned cards, not a sequential reveal list. */
.stack { position: relative; }
.stack__item {
  position: sticky; top: 0;
  min-height: 100dvh;
  display: flex; align-items: center;
  padding-block: var(--s-8);
}
.stack__item + .stack__item { top: 0; }

/* Core Web Vitals read-out: label above value, tabular figures so the
   numbers do not jitter while they update. */
.vitals {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  gap: var(--s-5) var(--s-6);
  margin: 0;
}
.vitals > div { min-width: 0; }
.vitals .meta-k { margin-bottom: var(--s-2); }
.vitals .meta-v { margin: 0; font-size: var(--t-h3); letter-spacing: var(--track-tight); }