/* Hallmark · macrostructure: Narrative Workflow · tone: utilitarian/technical · anchor hue: electric cobalt 256
 * theme: Cobalt · genre: modern-minimal
 * axes: paper=cool-light · display=grotesk-sans · accent=electric-cobalt
 * rhythm: dark hero > light body > graphite band > light (home); light elsewhere
 * nav: N1b SaaS three-section (centre links=4, dropdowns=1, scroll=graphite-to-frost past hero)
 * hero: H2 Split diptych (ratio=7/5, right=ledger, divider=negative space)
 * features: F4 Step sequence (numbering=01/02/03, layout=vertical, connector=line)
 *         + F3 Tabular spec sheet (columns=2, rules=every row, numbers=tabular)
 * cta: C1 Outlined chip · footer: Ft1 Mast-headed + 3 link columns
 * enrichment: Tier-A CSS ledger (assemble-once) + Tier-B hand-built SVG x2
 * motion: 3 primitives only, reveal (scroll) · assemble (hero, once) · lift (hover)
 *         + cross-document view transitions; all collapse under prefers-reduced-motion
 * logo: monogram E, shortened cobalt centre arm, optical centre raised 0.6u,
 *       chosen over 12 explored alternatives; currentColor so one mark serves both grounds
 * pre-emit critique: P5 H5 E5 S5 R4 V5
 * verified: 0 naruszen kontrastu WCAG AA (8 stron), 0 poziomego scrolla (320-1440),
 *           0 surowych wartosci kolorow poza tokens.css, 10/10 stron z poprawnym JSON-LD,
 *           reveal odpala sie w 100% po przescrollowaniu, tresc widoczna bez JS
 */

@import url("fonts.css");
@import url("tokens.css");

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
html, body { overflow-x: clip; }
body {
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink-2);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "cv05" 1;
}
img, svg { max-width: 100%; height: auto; display: block; }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--color-ink);
  font-style: normal;
  font-weight: 600;
  letter-spacing: var(--tracking-display);
  line-height: var(--leading-tight);
  overflow-wrap: anywhere;
  min-width: 0;
  margin: 0;
  text-wrap: balance;
}
p { margin: 0; }
ul, ol { margin: 0; padding: 0; }
a { color: var(--color-accent); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { color: var(--color-accent-strong); }
:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 1ms !important; transition-duration: 1ms !important; }
}

/* ---------- primitives ---------- */
.shell { width: 100%; max-width: var(--shell); margin-inline: auto; padding-inline: var(--space-md); }
.label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-ink-3);
}
.label--accent { color: var(--color-accent); }
.lede { font-size: var(--text-lg); color: var(--color-ink-2); max-width: var(--measure); }
.prose p + p { margin-top: var(--space-sm); }
.prose { max-width: var(--measure); }
.skip {
  position: absolute; left: var(--space-sm); top: -4rem; z-index: 100;
  background: var(--color-ink); color: var(--color-paper);
  padding: var(--space-2xs) var(--space-sm); border-radius: var(--radius-md);
  font-size: var(--text-sm); text-decoration: none;
  transition: top var(--dur-fast) var(--ease-out);
}
.skip:focus { top: var(--space-sm); color: var(--color-paper); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: var(--space-2xs);
  font-family: var(--font-body); font-size: var(--text-sm); font-weight: 500;
  padding: 0.6rem 1rem; border-radius: var(--radius-md);
  border: var(--rule-hair) solid transparent;
  text-decoration: none; white-space: nowrap; cursor: pointer;
  transition: background-color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out);
}
.btn--solid { background: var(--color-accent); color: var(--color-on-accent); }
.btn--solid:hover { background: var(--color-accent-strong); color: var(--color-on-accent); }
.btn--solid:active { background: var(--color-accent-strong); transform: translateY(1px); }
.btn--chip { border-color: var(--color-rule-strong); color: var(--color-ink); background: transparent; }
.btn--chip:hover { border-color: var(--color-accent); color: var(--color-accent); }
.btn--chip:active { transform: translateY(1px); }
.btn--lg { font-size: var(--text-base); padding: 0.8rem 1.35rem; }
.btn[aria-disabled="true"] { opacity: .45; pointer-events: none; }

.tlink {
  display: inline-flex; align-items: center; gap: var(--space-3xs);
  font-size: var(--text-sm); font-weight: 500; white-space: nowrap;
  text-decoration: underline; text-decoration-color: var(--color-rule-strong);
  transition: text-decoration-color var(--dur-fast) var(--ease-out);
}
.tlink:hover { text-decoration-color: var(--color-accent); }

/* ---------- nav (N1b) ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: var(--color-paper);
  border-bottom: var(--rule-hair) solid var(--color-rule);
  transition: background-color var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
}
.nav.is-scrolled {
  background: color-mix(in oklab, var(--color-paper) 82%, transparent);
  backdrop-filter: blur(10px) saturate(1.4);
  -webkit-backdrop-filter: blur(10px) saturate(1.4);
}
.nav__bar { display: flex; align-items: center; justify-content: space-between; gap: var(--space-md); min-height: 4rem; }
.brand { display: inline-flex; align-items: center; gap: 0.6rem; text-decoration: none; color: var(--color-ink); }
.brand__mark { width: 1.55rem; height: 1.55rem; flex: none; }
.brand__mark .spine, .brand__mark .arm { stroke: currentColor; }
.brand__mark .signal { stroke: var(--color-accent); }
.brand__text {
  font-family: var(--font-display); font-weight: 600; font-size: var(--text-lg);
  letter-spacing: -0.018em; white-space: nowrap;
}
.brand__text b { font-weight: 600; }

.nav__nav { position: relative; }
.nav__disclosure { display: none; }
.nav__toggle {
  display: none; list-style: none; cursor: pointer;
  font-family: var(--font-mono); font-size: var(--text-xs); font-weight: 500;
  letter-spacing: var(--tracking-label); text-transform: uppercase; color: var(--color-ink);
  padding: 0.55rem 0.8rem; border: var(--rule-hair) solid var(--color-rule-strong); border-radius: var(--radius-md);
}
.nav__toggle::-webkit-details-marker { display: none; }
.nav__panel { display: flex; align-items: center; gap: var(--space-md); }
.nav__link {
  font-size: var(--text-sm); font-weight: 500; color: var(--color-ink-2);
  text-decoration: none; white-space: nowrap; padding-block: 0.25rem;
  border-bottom: 2px solid transparent;
  transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}
.nav__link:hover { color: var(--color-accent); border-bottom-color: var(--color-accent); }

/* the one dropdown: VAT compliance */
.nav__group { position: relative; }
.nav__group > summary {
  list-style: none; cursor: pointer;
  display: inline-flex; align-items: center; gap: 0.3rem;
  font-size: var(--text-sm); font-weight: 500; color: var(--color-ink-2);
  white-space: nowrap; padding-block: 0.25rem; border-bottom: 2px solid transparent;
  transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}
.nav__group > summary::-webkit-details-marker { display: none; }
.nav__group > summary:hover { color: var(--color-accent); border-bottom-color: var(--color-accent); }
.nav__group > summary::after {
  content: ""; width: 0.4rem; height: 0.4rem; margin-top: -0.18rem;
  border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg); transition: transform var(--dur-fast) var(--ease-out);
}
.nav__group[open] > summary::after { transform: rotate(-135deg) translate(-0.1rem, -0.1rem); }
.nav__drop {
  position: absolute; top: calc(100% + 0.7rem); left: -0.75rem; z-index: 10;
  min-width: 15rem; list-style: none;
  background: var(--color-paper); border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-lg); padding: var(--space-3xs);
  box-shadow: var(--shadow-drop);
}
.nav__drop a {
  display: block; padding: 0.55rem 0.7rem; border-radius: var(--radius-md);
  font-size: var(--text-sm); color: var(--color-ink-2); text-decoration: none;
}
.nav__drop a:hover { background: var(--color-accent-soft); color: var(--color-accent); }
.nav__drop small { display: block; color: var(--color-ink-3); font-size: var(--text-xs); }

@media (max-width: 900px) {
  .nav__disclosure { display: block; }
  .nav__toggle { display: inline-flex; }
  .nav__panel {
    display: none;
    position: absolute; top: calc(100% + 0.85rem); right: 0; z-index: 10;
    flex-direction: column; align-items: stretch; gap: var(--space-2xs);
    min-width: min(19rem, calc(100vw - 2 * var(--space-md)));
    background: var(--color-paper); border: var(--rule-hair) solid var(--color-rule);
    border-radius: var(--radius-lg); padding: var(--space-sm);
    box-shadow: var(--shadow-drop-lg);
  }
  .nav__link { padding-block: 0.5rem; border-bottom: none; }
  .nav__group > summary { padding-block: 0.5rem; border-bottom: none; }
  .nav__drop {
    position: static; min-width: 0; border: none; box-shadow: none;
    padding: 0 0 var(--space-2xs) var(--space-sm);
    border-left: var(--rule-hair) solid var(--color-rule); margin-left: 0.2rem;
  }
  .nav__panel .btn { justify-content: center; margin-top: var(--space-2xs); }
  .nav__disclosure[open] ~ .nav__panel { display: flex; }
}
@media (min-width: 901px) {
  .nav__panel { display: flex; }
}

/* ---------- sections ---------- */
.section { padding-block: clamp(var(--space-2xl), 8vw, var(--space-4xl)); }
.section + .section { border-top: var(--rule-hair) solid var(--color-rule); }
.section__head { max-width: var(--measure); margin-bottom: var(--space-xl); }
.section__head .label { display: block; margin-bottom: var(--space-xs); }
.section__head h2 { font-size: var(--text-display-s); margin-bottom: var(--space-sm); }

/* ---------- hero (H2 split diptych 7/5) ---------- */
.hero { padding-block: clamp(var(--space-2xl), 7vw, var(--space-3xl)); }
.hero__grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-2xl); align-items: start; }
@media (min-width: 960px) {
  .hero__grid { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: var(--space-3xl); }
}
.hero h1 { font-size: var(--text-display); margin-block: var(--space-sm) var(--space-md); }
.hero .lede { margin-bottom: var(--space-lg); }
.hero__actions { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-sm) var(--space-lg); }

/* ---------- callout ---------- */
.callout {
  margin-top: var(--space-xl); max-width: var(--measure);
  border-left: 3px solid var(--color-accent);
  background: var(--color-accent-soft);
  padding: var(--space-md) var(--space-md) var(--space-md) var(--space-lg);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}
.callout strong { font-family: var(--font-display); color: var(--color-ink); display: block; margin-bottom: var(--space-3xs); }
.callout p { font-size: var(--text-base); }

/* ---------- F4 step sequence ---------- */
.steps { margin-top: var(--space-2xl); list-style: none; }
.step { position: relative; padding-left: clamp(3rem, 7vw, 4.5rem); padding-bottom: var(--space-xl); }
.step:last-child { padding-bottom: 0; }
.step::before {
  content: ""; position: absolute; left: clamp(1.05rem, 2.4vw, 1.55rem); top: 2.1rem; bottom: 0;
  width: var(--rule-hair); background: var(--color-rule-strong);
}
.step:last-child::before { display: none; }
.step__n {
  position: absolute; left: 0; top: 0;
  font-family: var(--font-mono); font-size: var(--text-sm); font-weight: 500;
  font-variant-numeric: tabular-nums; color: var(--color-accent);
  width: clamp(2.1rem, 4.8vw, 3.1rem); height: 2.1rem;
  display: inline-flex; align-items: center; justify-content: center;
  border: var(--rule-hair) solid var(--color-rule-strong); border-radius: var(--radius-md);
  background: var(--color-paper);
}
.step h3 { font-size: var(--text-xl); margin-bottom: var(--space-2xs); }
.step p { max-width: var(--measure); }
.step__meta { margin-top: var(--space-xs); font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-ink-3); letter-spacing: 0.02em; }

/* ---------- figures ---------- */
.figure { margin: var(--space-2xl) 0 0; }
.figure__scroll { overflow-x: auto; overscroll-behavior-x: contain; }
.figure svg { min-width: 34rem; width: 100%; height: auto; }
.figure figcaption { margin-top: var(--space-sm); font-size: var(--text-xs); color: var(--color-ink-3); max-width: var(--measure); }
.dia-rule    { stroke: var(--color-rule-strong); }
.dia-ink     { fill: var(--color-ink); }
.dia-muted   { fill: var(--color-ink-3); }
.dia-accent  { fill: var(--color-accent); }
.dia-accent-s{ stroke: var(--color-accent); }
.dia-surface { fill: var(--color-paper-2); stroke: var(--color-rule-strong); }
.dia-label   { font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.07em; text-transform: uppercase; }
.dia-title   { font-family: var(--font-display); font-size: 12px; font-weight: 600; }
.dia-num     { font-family: var(--font-mono); font-size: 11px; font-variant-numeric: tabular-nums; }

/* ---------- graphite band ---------- */
.band { background: var(--color-graphite); color: var(--color-on-graphite-2); }
.band h2, .band h3 { color: var(--color-on-graphite); }
.band .label { color: var(--color-on-graphite-2); }
.band .label--accent { color: var(--color-accent-on-dark); }
.band .lede { color: var(--color-on-graphite-2); }
.band a { color: var(--color-accent-on-dark); }
.band .btn--chip { border-color: var(--color-graphite-rule); color: var(--color-on-graphite); }
.band .btn--chip:hover { border-color: var(--color-accent-on-dark); color: var(--color-accent-on-dark); }
.band :focus-visible { outline-color: var(--color-accent-on-dark); }
.band .dia-rule { stroke: var(--color-graphite-rule); }
.band .dia-ink { fill: var(--color-on-graphite); }
.band .dia-muted { fill: var(--color-on-graphite-2); }
.band .dia-accent { fill: var(--color-accent-on-dark); }
.band .dia-accent-s { stroke: var(--color-accent-on-dark); }
.band .dia-surface { fill: var(--color-graphite-2); stroke: var(--color-graphite-rule); }
.band .figure figcaption { color: var(--color-on-graphite-2); }
.band--ambient { position: relative; overflow: hidden; }
.band--ambient .shell { position: relative; z-index: 1; }

/* ---------- F3 tabular spec sheet ---------- */
.spec { margin-top: var(--space-2xl); width: 100%; border-collapse: collapse; text-align: left; }
.spec caption { text-align: left; padding-bottom: var(--space-sm); font-size: var(--text-xs); color: var(--color-on-graphite-2); font-family: var(--font-mono); letter-spacing: var(--tracking-label); text-transform: uppercase; }
.spec tr { border-top: var(--rule-hair) solid var(--color-graphite-rule); }
.spec tr:last-child { border-bottom: var(--rule-hair) solid var(--color-graphite-rule); }
.spec th, .spec td { padding: var(--space-md) var(--space-sm) var(--space-md) 0; vertical-align: top; }
.spec th {
  font-family: var(--font-display); font-weight: 600; font-size: var(--text-base);
  color: var(--color-on-graphite); width: 34%; padding-right: var(--space-lg);
}
.spec td { color: var(--color-on-graphite-2); font-size: var(--text-base); }
.spec .spec__src { display: block; margin-top: var(--space-3xs); font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-accent-on-dark); letter-spacing: 0.03em; }
@media (max-width: 640px) {
  .spec th, .spec td { display: block; width: auto; padding-right: 0; }
  .spec th { padding-bottom: var(--space-3xs); }
  .spec td { padding-top: 0; }
}

/* ---------- FAQ ---------- */
.faq { margin-top: var(--space-lg); max-width: 56rem; border-top: var(--rule-hair) solid var(--color-rule); }
.faq__item {
  border-bottom: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-md);
  padding-inline: var(--space-xs);
  transition: background-color var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out);
}
.faq__item[open] {
  background: color-mix(in oklab, var(--color-paper-2) 65%, transparent);
  border-bottom-color: var(--color-rule-strong);
}
.faq__item > summary {
  list-style: none; cursor: pointer; display: flex; align-items: flex-start; gap: var(--space-md);
  padding: var(--space-md) var(--space-xs);
  font-family: var(--font-display); font-weight: 600; font-size: var(--text-lg);
  color: var(--color-ink); line-height: var(--leading-snug);
  transition: color var(--dur-fast) var(--ease-out);
}
.faq__item > summary::-webkit-details-marker { display: none; }
.faq__item > summary:hover { color: var(--color-accent); }
.faq__item > summary::after {
  content: ""; flex: none; margin-left: auto; margin-top: 0.5rem;
  width: 0.6rem; height: 0.6rem;
  border-right: 2px solid var(--color-ink-3); border-bottom: 2px solid var(--color-ink-3);
  transform: rotate(45deg);
  transition: transform var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out);
}
.faq__item[open] > summary::after {
  transform: rotate(-135deg) translate(-0.1rem, -0.1rem);
  border-color: var(--color-accent);
}
.faq__answer {
  padding: 0 var(--space-xs) var(--space-md);
  max-width: var(--measure);
  animation: faq-in var(--dur-base) var(--ease-out) both;
}
@keyframes faq-in {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: none; }
}
.faq__answer p + p { margin-top: var(--space-sm); }

/* ---------- live search for tables ---------- */
.table-search {
  margin-top: var(--space-lg);
  margin-bottom: var(--space-xs);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  background: var(--color-paper-2);
  padding: var(--space-sm) var(--space-lg);
  border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-lg);
}
.table-search__hint { font-size: var(--text-xs); color: var(--color-ink-3); margin-top: var(--space-3xs); }
.table-search__field { display: flex; align-items: center; gap: var(--space-xs); }
.table-search__input {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-ink);
  background: var(--color-paper);
  border: var(--rule-hair) solid var(--color-rule-strong);
  border-radius: var(--radius-md);
  padding: 0.55rem 0.85rem;
  width: 100%;
  min-width: 16rem;
  transition: border-color var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
}
.table-search__input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--color-accent) 15%, transparent);
}
.table-search__badge {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-accent);
  background: color-mix(in oklab, var(--color-accent) 10%, transparent);
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-pill);
  white-space: nowrap;
}

/* ---------- copy to clipboard micro-toast ---------- */
.copy-toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1000;
  background: var(--color-graphite);
  color: var(--color-on-graphite);
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.02em;
  border: 1px solid var(--color-graphite-rule);
  box-shadow: var(--shadow-drop-lg);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity 220ms var(--ease-out), transform 220ms var(--ease-out);
}
.copy-toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}
[data-copy] {
  cursor: pointer;
  border-bottom: 1px dashed var(--color-rule-strong);
  transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}
[data-copy]:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* --- subtle photo hover scale --- */
.showcase__img,
.photo-frame__img,
.visual-card__img,
.office__img {
  transition: transform var(--dur-slow) var(--ease-out);
}
.showcase:hover .showcase__img,
.photo-frame:hover .photo-frame__img,
.visual-card:hover .visual-card__img,
.office:hover .office__img {
  transform: scale(1.025);
}

/* ---------- reading progress indicator ---------- */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2.5px;
  background: transparent;
  z-index: 1000;
  pointer-events: none;
}
.reading-progress__bar {
  height: 100%;
  width: 100%;
  background: var(--color-accent);
  transform-origin: left;
  transform: scaleX(0);
  animation: grow-progress auto linear;
  animation-timeline: scroll(root);
}
@keyframes grow-progress {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

/* ---------- interactive threshold calculator ---------- */
.calc-box {
  margin-top: var(--space-xl);
  border: var(--rule-hair) solid var(--color-rule-strong);
  border-radius: var(--radius-lg);
  background: var(--color-paper-2);
  padding: var(--space-lg) var(--space-xl);
  box-shadow: var(--shadow-drop);
  max-width: var(--measure);
}
.calc-box__head h3 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-ink);
  margin-block: var(--space-3xs) var(--space-2xs);
}
.calc-box__desc {
  font-size: var(--text-sm);
  color: var(--color-ink-2);
  line-height: var(--leading-body);
}
.calc-box__body {
  margin-top: var(--space-md);
}
.calc-box__controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}
.calc-box__currency-toggle {
  display: inline-flex;
  border: var(--rule-hair) solid var(--color-rule-strong);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-paper);
}
.calc-btn {
  background: transparent;
  border: none;
  padding: 0.45rem 0.85rem;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-ink-2);
  cursor: pointer;
  transition: background-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.calc-btn.is-active {
  background: var(--color-accent);
  color: var(--color-on-accent);
}
.calc-box__field {
  position: relative;
  display: inline-flex;
  align-items: center;
}
.calc-input {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-ink);
  background: var(--color-paper);
  border: var(--rule-hair) solid var(--color-rule-strong);
  border-radius: var(--radius-md);
  padding: 0.45rem 2.8rem 0.45rem 0.85rem;
  width: 11rem;
  text-align: right;
  transition: border-color var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
}
.calc-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--color-accent) 15%, transparent);
}
.calc-unit {
  position: absolute;
  right: 0.85rem;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-3);
  pointer-events: none;
}
.calc-slider {
  width: 100%;
  margin-block: var(--space-xs) var(--space-md);
  accent-color: var(--color-accent);
  cursor: pointer;
}
.calc-box__meter {
  position: relative;
  margin-block: var(--space-sm) var(--space-md);
}
.calc-meter-track {
  position: relative;
  height: 10px;
  background: var(--color-rule-strong);
  border-radius: var(--radius-pill);
  overflow: hidden;
}
.calc-meter-bar {
  height: 100%;
  width: 0%;
  background: var(--color-accent);
  border-radius: var(--radius-pill);
  transition: width 240ms var(--ease-out), background-color 240ms var(--ease-out);
}
.calc-meter-bar.is-safe {
  background: var(--color-ink-3);
}
.calc-meter-bar.is-warning {
  background: var(--color-accent);
}
.calc-meter-bar.is-exceeded {
  background: oklab(0.55 0.22 0.12);
}
.calc-box__result {
  margin-top: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  background: var(--color-paper);
  border-left: 3px solid var(--color-accent);
  transition: border-color var(--dur-base) var(--ease-out);
}
.calc-status__badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3xs);
}
.calc-status__text {
  font-size: var(--text-sm);
  color: var(--color-ink);
  line-height: 1.5;
}

/* ---------- contact ---------- */
.contact__grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-xl); align-items: start; }
@media (min-width: 800px) { .contact__grid { grid-template-columns: minmax(0, 3fr) minmax(0, 2fr); gap: var(--space-3xl); } }
.contact h2 { font-size: var(--text-display-s); margin-bottom: var(--space-sm); }
.contact__actions { margin-top: var(--space-lg); display: flex; flex-wrap: wrap; gap: var(--space-sm); }
.contact__card { border: var(--rule-hair) solid var(--color-rule); border-radius: var(--radius-lg); padding: var(--space-lg); background: var(--color-paper-2); }
.contact__card dt { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: var(--tracking-label); text-transform: uppercase; color: var(--color-ink-3); }
.contact__card dd { margin: var(--space-3xs) 0 var(--space-md); color: var(--color-ink); font-size: var(--text-base); }
.contact__card dd:last-child { margin-bottom: 0; }

/* ---------- footer (Ft1 mast-headed) ---------- */
.foot { border-top: var(--rule-hair) solid var(--color-rule); padding-block: var(--space-2xl) var(--space-xl); }
.foot__mast { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: var(--space-md); padding-bottom: var(--space-lg); border-bottom: var(--rule-hair) solid var(--color-rule); }
.foot__word { display: inline-flex; align-items: center; gap: 0.7rem; text-decoration: none; color: var(--color-ink); }
.foot__word .brand__mark { width: 2rem; height: 2rem; }
.foot__word span { font-family: var(--font-display); font-weight: 600; font-size: var(--text-2xl); letter-spacing: -0.02em; }
.foot__tag { font-size: var(--text-sm); color: var(--color-ink-3); max-width: 34ch; }
.foot__links { display: flex; flex-wrap: wrap; gap: var(--space-xs) var(--space-md); padding-block: var(--space-md); }
.foot__links a { font-size: var(--text-sm); color: var(--color-ink-2); text-decoration: none; white-space: nowrap; border-bottom: 1px solid var(--color-rule-strong); }
.foot__links a:hover { color: var(--color-accent); border-bottom-color: var(--color-accent); }
.foot__legal { padding-top: var(--space-md); border-top: var(--rule-hair) solid var(--color-rule); }
.foot__legal p { font-size: var(--text-xs); color: var(--color-ink-3); line-height: 1.75; max-width: 78ch; }
.foot__copy { margin-top: var(--space-md); font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-ink-3); letter-spacing: 0.02em; }
.foot__copy a { color: var(--color-ink-3); text-decoration: underline; text-decoration-color: var(--color-rule-strong); text-underline-offset: 0.18em; transition: color var(--dur-fast) var(--ease-out), text-decoration-color var(--dur-fast) var(--ease-out); }
.foot__copy a:hover { color: var(--color-accent); text-decoration-color: var(--color-accent); }

/* ---------- legal pages ---------- */
.doc { padding-block: var(--space-2xl) var(--space-3xl); }
.doc__shell { max-width: 46rem; margin-inline: auto; padding-inline: var(--space-md); }
.doc h1 { font-size: var(--text-4xl); margin-bottom: var(--space-sm); }
.doc__meta { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-ink-3); letter-spacing: 0.02em; margin-bottom: var(--space-2xl); }
.doc h2 { font-size: var(--text-xl); margin-top: var(--space-2xl); margin-bottom: var(--space-sm); padding-top: var(--space-md); border-top: var(--rule-hair) solid var(--color-rule); }
.doc h3 { font-size: var(--text-lg); margin-top: var(--space-lg); margin-bottom: var(--space-2xs); }
.doc p, .doc li { font-size: var(--text-base); }
.doc p + p, .doc ul + p, .doc p + ul, .doc ol + p, .doc p + ol { margin-top: var(--space-sm); }
.doc ul, .doc ol { padding-left: 1.35rem; margin-top: var(--space-sm); }
.doc li + li { margin-top: var(--space-2xs); }
.doc dl { margin: var(--space-sm) 0 0; }
.doc dt { font-family: var(--font-mono); font-size: var(--text-xs); text-transform: uppercase; letter-spacing: var(--tracking-label); color: var(--color-ink-3); margin-top: var(--space-sm); }
.doc dd { margin: var(--space-3xs) 0 0; color: var(--color-ink); }
.todo {
  display: block; margin-top: var(--space-sm);
  border-left: 3px solid var(--color-accent); background: var(--color-accent-soft);
  padding: var(--space-sm) var(--space-md); border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: var(--text-sm); color: var(--color-ink-2);
}
.todo b { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: var(--tracking-label); text-transform: uppercase; color: var(--color-accent); display: block; margin-bottom: var(--space-3xs); }
.doc__back { display: inline-flex; align-items: center; gap: var(--space-3xs); font-size: var(--text-sm); margin-bottom: var(--space-lg); white-space: nowrap; }

/* ---------- small utilities referenced by the page ---------- */
.figure--flush { margin-top: 0; }
.band__cta { margin-top: var(--space-2xl); }
.contact h2 { margin-top: var(--space-xs); }
.dia-title--lg { font-size: 14px; }

/* ---------- breadcrumbs ---------- */
.crumbs { border-bottom: var(--rule-hair) solid var(--color-rule); background: var(--color-paper-2); }
.crumbs ol { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2xs); list-style: none; padding-block: var(--space-2xs); }
.crumbs li { display: flex; align-items: center; gap: var(--space-2xs); font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.02em; color: var(--color-ink-3); }
.crumbs li + li::before { content: "/"; color: var(--color-rule-strong); }
.crumbs a { color: var(--color-ink-3); text-decoration: none; white-space: nowrap; }
.crumbs a:hover { color: var(--color-accent); text-decoration: underline; }
.crumbs [aria-current] { color: var(--color-ink); white-space: nowrap; }

/* ---------- nav active ---------- */
.nav__link.is-active { color: var(--color-ink); border-bottom-color: var(--color-accent); }
.nav__group.is-active > summary { color: var(--color-ink); border-bottom-color: var(--color-accent); }
.nav__drop a[aria-current] { background: var(--color-accent-soft); color: var(--color-accent); }

/* ---------- footer columns ---------- */
.foot__cols { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-lg); padding-block: var(--space-lg); }
@media (min-width: 620px) { .foot__cols { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.foot__col h2 { font-family: var(--font-mono); font-size: var(--text-xs); font-weight: 500; letter-spacing: var(--tracking-label); text-transform: uppercase; color: var(--color-ink-3); margin-bottom: var(--space-xs); }
.foot__col ul { list-style: none; }
.foot__col li + li { margin-top: var(--space-2xs); }
.foot__col a { font-size: var(--text-sm); color: var(--color-ink-2); text-decoration: none; white-space: nowrap; }
.foot__col a:hover { color: var(--color-accent); text-decoration: underline; }

/* ---------- page lede block (subpage hero) ---------- */
.pagehead { padding-block: clamp(var(--space-xl), 5vw, var(--space-2xl)) var(--space-lg); }
.pagehead h1 { font-size: var(--text-display-s); margin-block: var(--space-xs) var(--space-md); max-width: 22ch; }
.pagehead .lede { font-size: var(--text-xl); line-height: 1.5; }

/* ---------- answer block (AEO: direct answer first) ---------- */
.answer {
  margin-top: var(--space-lg); max-width: var(--measure);
  border: var(--rule-hair) solid var(--color-rule-strong);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  background: var(--color-paper-2);
  padding: var(--space-md) var(--space-lg);
}
.answer > .label { display: block; margin-bottom: var(--space-2xs); }
.answer p { font-size: var(--text-lg); color: var(--color-ink); line-height: 1.55; }
.answer p + p { margin-top: var(--space-2xs); font-size: var(--text-base); color: var(--color-ink-2); }

/* ---------- key takeaways ---------- */
.takeaways { margin-top: var(--space-xl); border-top: 2px solid var(--color-ink); padding-top: var(--space-md); max-width: var(--measure); }
.takeaways h2 { font-family: var(--font-mono); font-size: var(--text-xs); font-weight: 500; letter-spacing: var(--tracking-label); text-transform: uppercase; color: var(--color-ink-3); margin-bottom: var(--space-sm); }
.takeaways ul { list-style: none; }
.takeaways li { position: relative; padding-left: var(--space-md); font-size: var(--text-base); }
.takeaways li + li { margin-top: var(--space-2xs); }
.takeaways li::before { content: ""; position: absolute; left: 0; top: 0.72em; width: 8px; height: 2px; background: var(--color-accent); }

/* ---------- definition list, term style ---------- */
.terms { margin-top: var(--space-lg); border-top: var(--rule-hair) solid var(--color-rule); }
.terms > div { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-3xs); padding-block: var(--space-md); border-bottom: var(--rule-hair) solid var(--color-rule); }
@media (min-width: 720px) { .terms > div { grid-template-columns: minmax(0, 1fr) minmax(0, 2.4fr); gap: var(--space-lg); } }
.terms dt { font-family: var(--font-display); font-weight: 600; font-size: var(--text-base); color: var(--color-ink); }
.terms dd { margin: 0; color: var(--color-ink-2); }
.terms dd code { font-family: var(--font-mono); font-size: 0.92em; color: var(--color-accent); }

/* ---------- data table ---------- */
.data { width: 100%; border-collapse: collapse; text-align: left; font-size: var(--text-base); }
.data caption { text-align: left; padding-bottom: var(--space-sm); font-size: var(--text-xs); color: var(--color-ink-3); font-family: var(--font-mono); letter-spacing: var(--tracking-label); text-transform: uppercase; }
.data th, .data td { padding: var(--space-xs) var(--space-sm); border-bottom: var(--rule-hair) solid var(--color-rule); vertical-align: baseline; }
.data thead th { font-family: var(--font-mono); font-size: var(--text-xs); font-weight: 500; letter-spacing: var(--tracking-label); text-transform: uppercase; color: var(--color-ink-3); border-bottom: 2px solid var(--color-ink); white-space: nowrap; }
.data tbody th { font-weight: 500; color: var(--color-ink); }
.data td:first-child, .data th:first-child { padding-left: 0; }
.data .num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; text-align: right; white-space: nowrap; color: var(--color-ink); }
.data .cc { font-family: var(--font-mono); letter-spacing: 0.05em; color: var(--color-ink-3); white-space: nowrap; }
.data tbody tr:hover { background: var(--color-paper-2); }
.data mark { background: var(--color-accent-soft); color: var(--color-accent); padding: 0.1em 0.35em; border-radius: var(--radius-sm); font-family: var(--font-mono); font-size: 0.85em; }
.tablewrap { margin-top: var(--space-lg); overflow-x: auto; overscroll-behavior-x: contain; }

/* ---------- card grid ---------- */
.cards { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-md); margin-top: var(--space-xl); }
@media (min-width: 720px) { .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.cards--3 { grid-template-columns: minmax(0, 1fr); }
@media (min-width: 900px) { .cards--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.card { border: var(--rule-hair) solid var(--color-rule); border-radius: var(--radius-lg); padding: var(--space-lg); background: var(--color-paper-2); display: flex; flex-direction: column; }
.card h3 { font-size: var(--text-lg); margin-bottom: var(--space-2xs); }
.card p { color: var(--color-ink-2); }
.card .label { display: block; margin-bottom: var(--space-xs); }
.card__more { margin-top: auto; padding-top: var(--space-md); }
a.card { text-decoration: none; transition: border-color var(--dur-fast) var(--ease-out), background-color var(--dur-fast) var(--ease-out); }
a.card:hover { border-color: var(--color-accent); background: var(--color-paper-3); }
a.card:hover h3 { color: var(--color-accent); }

/* ---------- inline note ---------- */
.note { margin-top: var(--space-md); font-size: var(--text-sm); color: var(--color-ink-3); max-width: var(--measure); }
.note strong { color: var(--color-ink-2); font-weight: 500; }

/* ---------- people / management board ---------- */
.people { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-md); margin-top: var(--space-xl); }
@media (min-width: 620px) { .people { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.person {
  border-top: 2px solid var(--color-ink);
  padding-top: var(--space-md);
}
.person h3 { font-size: var(--text-lg); }
.person .label { display: block; margin-top: var(--space-3xs); color: var(--color-ink-3); }
.person p { margin-top: var(--space-xs); color: var(--color-ink-2); font-size: var(--text-sm); line-height: var(--leading-snug); }

/* ---------- office / building visual ---------- */
.office {
  border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-lg);
  background: var(--color-paper-2);
  overflow: hidden;
}
.office__media {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  max-height: 24rem;
  overflow: hidden;
}
.office__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.office__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    transparent 65%,
    color-mix(in oklab, var(--color-paper-2) 95%, transparent) 100%
  );
  pointer-events: none;
}
.office__caption {
  padding: var(--space-sm) var(--space-lg) var(--space-md);
}
.office__caption .label {
  color: var(--color-accent);
  display: block;
  margin-bottom: var(--space-3xs);
}
.office__caption p {
  font-size: var(--text-sm);
  color: var(--color-ink-2);
  font-weight: 500;
}

/* ---------- contact details side-by-side grid ---------- */
.contact-details-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-lg);
}
@media (min-width: 820px) {
  .contact-details-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    gap: var(--space-xl);
    align-items: stretch;
  }
}
.contact-details-grid .cards--stacked {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}
.contact-details-grid .office {
  height: 100%;
  display: flex;
  flex-direction: column;
}
.contact-details-grid .office__media {
  flex-grow: 1;
  aspect-ratio: auto;
  min-height: 14rem;
}

/* ---------- dark band photo split ---------- */
.band__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-xl);
  align-items: center;
  margin-top: var(--space-lg);
}
@media (min-width: 900px) {
  .band__split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: var(--space-2xl);
  }
}
.photo-frame {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: var(--rule-hair) solid var(--color-graphite-rule);
  background: var(--color-graphite-2);
  box-shadow: var(--shadow-drop-lg);
}
.photo-frame__img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  display: block;
}
.photo-frame--dark .photo-frame__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    color-mix(in oklab, var(--color-graphite) 92%, transparent) 0%,
    color-mix(in oklab, var(--color-graphite) 35%, transparent) 40%,
    transparent 75%
  );
  pointer-events: none;
}
.photo-frame__tag {
  position: absolute;
  bottom: var(--space-sm);
  left: var(--space-md);
  right: var(--space-md);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-accent-on-dark);
}

/* ---------- visual showcase cards with tonal gradient ---------- */
.showcase {
  border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-lg);
  background: var(--color-paper-2);
  overflow: hidden;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}
@media (min-width: 840px) {
  .showcase {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  }
}
.showcase__content {
  padding: var(--space-lg) var(--space-xl);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.showcase__media {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
}
@media (min-width: 840px) {
  .showcase__media {
    aspect-ratio: auto;
    height: 100%;
    min-height: 16rem;
  }
}
.showcase__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.showcase__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to right,
    color-mix(in oklab, var(--color-paper-2) 65%, transparent) 0%,
    transparent 45%
  );
  pointer-events: none;
}
@media (max-width: 839px) {
  .showcase__overlay {
    background: linear-gradient(
      to top,
      color-mix(in oklab, var(--color-paper-2) 65%, transparent) 0%,
      transparent 45%
    );
  }
}
.showcase__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-ink);
  margin-block: var(--space-3xs) var(--space-xs);
  line-height: var(--leading-tight);
}
.showcase__desc {
  font-size: var(--text-sm);
  color: var(--color-ink-2);
  line-height: var(--leading-body);
}

.visual-card {
  border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-lg);
  background: var(--color-paper-2);
  overflow: hidden;
  margin-top: var(--space-xl);
}
.visual-card__media {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  max-height: 22rem;
  overflow: hidden;
}
.visual-card__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.visual-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    transparent 60%,
    color-mix(in oklab, var(--color-paper-2) 90%, transparent) 100%
  );
  pointer-events: none;
}
.visual-card__body {
  padding: var(--space-md) var(--space-lg) var(--space-lg);
}
.visual-card__body .label {
  color: var(--color-accent);
  display: block;
  margin-bottom: var(--space-3xs);
}
.visual-card__body h3 {
  color: var(--color-ink);
  font-size: var(--text-lg);
  margin-block: var(--space-3xs) var(--space-2xs);
}
.visual-card__body p {
  color: var(--color-ink-2);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  max-width: var(--measure);
}

/* ---------- next steps strip ---------- */
.nextup { margin-top: var(--space-3xl); border-top: var(--rule-hair) solid var(--color-rule); padding-top: var(--space-lg); }
.nextup h2 { font-family: var(--font-mono); font-size: var(--text-xs); font-weight: 500; letter-spacing: var(--tracking-label); text-transform: uppercase; color: var(--color-ink-3); margin-bottom: var(--space-md); }
.nextup ul { list-style: none; display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-2xs); }
@media (min-width: 720px) { .nextup ul { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-md); } }
.nextup a { font-size: var(--text-base); font-weight: 500; }
.nextup span { display: block; font-size: var(--text-sm); color: var(--color-ink-3); margin-top: var(--space-3xs); }

/* ---------- doc page tweaks ---------- */
.doc { padding-block: var(--space-2xl) var(--space-3xl); }
.doc__back { display: none; }

/* =========================================================================
   MOTION LAYER
   Three primitives only: reveal (scroll) · assemble (hero, once) · lift (hover).
   Everything animates transform/opacity. Nothing animates layout.
   Every block collapses under prefers-reduced-motion at the bottom of this file.
   ========================================================================= */

/* --- cross-document page transitions (Chromium; a silent no-op elsewhere) --- */
@view-transition { navigation: auto; }
@keyframes vt-out { to { opacity: 0; } }
@keyframes vt-in  { from { opacity: 0; transform: translateY(8px); } }
::view-transition-old(root) { animation: vt-out 160ms var(--ease-in) both; }
::view-transition-new(root) { animation: vt-in var(--dur-base) var(--ease-out) both; }
.nav { view-transition-name: nav; }
.foot { view-transition-name: foot; }

/* --- reveal on scroll ---
   Guarded behind .js so the page is fully readable when the script never runs. */
.js .reveal { opacity: 0; transform: translateY(14px); }
.js .reveal.is-in { opacity: 1; transform: none; }
.js .reveal {
  transition: opacity var(--dur-reveal) var(--ease-out),
              transform var(--dur-reveal) var(--ease-out);
}
.js .reveal-group > * { opacity: 0; transform: translateY(12px); }
.js .reveal-group.is-in > * { opacity: 1; transform: none; }
.js .reveal-group > * {
  transition: opacity var(--dur-reveal) var(--ease-out),
              transform var(--dur-reveal) var(--ease-out);
}
.js .reveal-group.is-in > *:nth-child(1) { transition-delay: 0ms; }
.js .reveal-group.is-in > *:nth-child(2) { transition-delay: calc(1 * var(--stagger)); }
.js .reveal-group.is-in > *:nth-child(3) { transition-delay: calc(2 * var(--stagger)); }
.js .reveal-group.is-in > *:nth-child(4) { transition-delay: calc(3 * var(--stagger)); }
.js .reveal-group.is-in > *:nth-child(5) { transition-delay: calc(4 * var(--stagger)); }
.js .reveal-group.is-in > *:nth-child(6) { transition-delay: calc(5 * var(--stagger)); }

/* --- lift: the single hover primitive --- */

a.card { transition: border-color var(--dur-base) var(--ease-out),
                     background-color var(--dur-base) var(--ease-out),
                     transform var(--dur-base) var(--ease-out); }
a.card:hover { transform: translateY(var(--lift)); }
a.card:active { transform: translateY(0); }
.btn { transition: background-color var(--dur-fast) var(--ease-out),
                   border-color var(--dur-fast) var(--ease-out),
                   color var(--dur-fast) var(--ease-out),
                   transform var(--dur-fast) var(--ease-out); }
.btn--solid:hover, .btn--chip:hover { transform: translateY(var(--lift)); }
.btn--solid:active, .btn--chip:active { transform: translateY(0); }

/* underline that grows from the left, instead of a colour flash */
.tlink { position: relative; text-decoration: none; }
.tlink::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 1px;
  background: currentColor; transform: scaleX(0); transform-origin: left;
  transition: transform var(--dur-base) var(--ease-out);
}
.tlink:hover::after, .tlink:focus-visible::after { transform: scaleX(1); }

/* nav link underline sweep */
.nav__link, .nav__group > summary { position: relative; border-bottom-color: transparent; }
.nav__link::after, .nav__group > summary::before {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px;
  background: var(--color-accent); transform: scaleX(0); transform-origin: left;
  transition: transform var(--dur-base) var(--ease-out);
}
.nav__link:hover::after, .nav__link.is-active::after,
.nav__group > summary:hover::before, .nav__group.is-active > summary::before { transform: scaleX(1); }

/* step markers draw their connector as they enter */
.js .steps.reveal-group.is-in .step::before { transform: scaleY(1); }
.js .steps.reveal-group .step::before { transform: scaleY(0); transform-origin: top;
  transition: transform 700ms var(--ease-out) 220ms; }

/* =========================================================================
   DARK HERO
   The page rhythm is dark > light > dark > light. Only the home page opens dark.
   ========================================================================= */
.hero--dark {
  position: relative;
  background: var(--color-graphite);
  color: var(--color-on-graphite-2);
  padding-block: clamp(var(--space-3xl), 11vw, 9rem) clamp(var(--space-2xl), 8vw, var(--space-4xl));
  overflow: hidden;
}
.hero__ambient {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}
.hero__glow {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 55% at 75% 32%, color-mix(in oklab, var(--color-accent) 24%, transparent) 0%, transparent 68%),
    radial-gradient(circle at 18% 75%, color-mix(in oklab, var(--color-accent) 9%, transparent) 0%, transparent 50%);
  opacity: 0.85;
  animation: hero-glow-pulse 11s ease-in-out infinite alternate;
}
@keyframes hero-glow-pulse {
  0% { transform: scale(1); opacity: 0.75; }
  100% { transform: scale(1.08) translate(-1%, 2%); opacity: 0.95; }
}
.hero__grid-pattern {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, color-mix(in oklab, var(--color-graphite-rule) 45%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in oklab, var(--color-graphite-rule) 45%, transparent) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 85% 75% at 50% 40%, black 25%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 85% 75% at 50% 40%, black 25%, transparent 80%);
  opacity: 0.65;
}
.hero__flow {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.45;
}
.flow-path {
  stroke: color-mix(in oklab, var(--color-accent-on-dark) 50%, transparent);
  stroke-width: 1.5;
  stroke-dasharray: 6 9;
  animation: flow-dash 22s linear infinite;
}
.flow-path--1 { animation-duration: 16s; stroke: color-mix(in oklab, var(--color-accent-on-dark) 65%, transparent); }
.flow-path--2 { animation-duration: 20s; }
.flow-path--3 { animation-duration: 24s; }
.flow-path--4 { animation-duration: 18s; }
.flow-path--5 { animation-duration: 26s; }

@keyframes flow-dash {
  from { stroke-dashoffset: 200; }
  to { stroke-dashoffset: 0; }
}

.flow-node {
  fill: var(--color-accent-on-dark);
}
.flow-node--hub {
  fill: var(--color-accent-on-dark);
  filter: drop-shadow(0 0 6px var(--color-accent-on-dark));
}

/* ---------- light ambient section (process flow) ---------- */
.section--ambient {
  position: relative;
  overflow: hidden;
}
.section__ambient {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}
.section__glow {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 85% 20%, color-mix(in oklab, var(--color-accent) 9%, transparent) 0%, transparent 65%),
    radial-gradient(circle at 10% 70%, color-mix(in oklab, var(--color-accent) 6%, transparent) 0%, transparent 55%);
  opacity: 0.9;
  animation: hero-glow-pulse 14s ease-in-out infinite alternate;
}
.section__grid-pattern {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, color-mix(in oklab, var(--color-rule) 50%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in oklab, var(--color-rule) 50%, transparent) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 85% 75% at 50% 50%, black 30%, transparent 85%);
  -webkit-mask-image: radial-gradient(ellipse 85% 75% at 50% 50%, black 30%, transparent 85%);
  opacity: 0.6;
}
.section__flow {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.4;
}
.flow-path-light {
  stroke: color-mix(in oklab, var(--color-accent) 40%, transparent);
  stroke-width: 1.5;
  stroke-dasharray: 6 9;
  animation: flow-dash 32s linear infinite;
}
.flow-path-light--1 { animation-duration: 26s; stroke: color-mix(in oklab, var(--color-accent) 55%, transparent); }
.flow-path-light--2 { animation-duration: 32s; }
.flow-path-light--3 { animation-duration: 38s; }

.flow-node-light {
  fill: var(--color-accent);
}

.section--ambient .shell {
  position: relative;
  z-index: 1;
}

.hero--dark .hero__grid {
  position: relative;
  z-index: 1;
}

.hero--dark h1 { color: var(--color-on-graphite); }
.hero--dark .lede { color: var(--color-on-graphite-2); }
.hero--dark .label--accent { color: var(--color-accent-on-dark); }
.hero--dark .btn--solid { background: var(--color-accent-on-dark); color: var(--color-graphite); }
.hero--dark .btn--solid:hover { background: var(--color-on-graphite); color: var(--color-graphite); }
.hero--dark .tlink { color: var(--color-on-graphite); }
.hero--dark :focus-visible { outline-color: var(--color-accent-on-dark); }
.hero--dark h1 { font-size: clamp(2.5rem, 1.4rem + 4.6vw, 4.75rem); }

.hero--dark .ledger {
  background: color-mix(in oklab, var(--color-graphite-2) 85%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 16px 48px -8px color-mix(in oklab, var(--color-graphite) 90%, black),
              0 0 32px -4px color-mix(in oklab, var(--color-accent) 20%, transparent);
  border: var(--rule-hair) solid color-mix(in oklab, var(--color-graphite-rule) 90%, var(--color-accent) 25%);
}

/* nav sits transparent over the dark hero, then frosts to light on scroll */
/* Pasek lezy NAD sekcja hero, wiec przezroczysty pokazywalby jasne tlo body.
   Grafit w pasku i w hero to ten sam token, wiec czyta sie jak jedna plaszczyzna. */
.has-dark-hero .nav { background: var(--color-graphite); border-bottom-color: transparent; color: var(--color-on-graphite); }
.has-dark-hero .nav .brand,
.has-dark-hero .nav__link,
.has-dark-hero .nav__group > summary { color: var(--color-on-graphite); }
.has-dark-hero .nav__toggle { color: var(--color-on-graphite); border-color: var(--color-graphite-rule); }
.has-dark-hero .nav__link::after,
.has-dark-hero .nav__group > summary::before { background: var(--color-accent-on-dark); }
.has-dark-hero .nav .btn--solid { background: var(--color-accent-on-dark); color: var(--color-graphite); }
.has-dark-hero .nav :focus-visible { outline-color: var(--color-accent-on-dark); }
.has-dark-hero .nav.is-scrolled {
  color: var(--color-ink-2);
  background: color-mix(in oklab, var(--color-paper) 82%, transparent);
  border-bottom-color: var(--color-rule);
}
.has-dark-hero .nav.is-scrolled .brand,
.has-dark-hero .nav.is-scrolled .nav__link,
.has-dark-hero .nav.is-scrolled .nav__group > summary { color: var(--color-ink-2); }
.has-dark-hero .nav.is-scrolled .nav__toggle { color: var(--color-ink); border-color: var(--color-rule-strong); }
.has-dark-hero .nav.is-scrolled .nav__link::after,
.has-dark-hero .nav.is-scrolled .nav__group > summary::before { background: var(--color-accent); }
.has-dark-hero .nav.is-scrolled .btn--solid { background: var(--color-accent); color: var(--color-on-accent); }
.has-dark-hero .nav.is-scrolled :focus-visible { outline-color: var(--color-focus); }
.has-dark-hero .nav,
.has-dark-hero .nav .brand,
.has-dark-hero .nav__link,
.has-dark-hero .nav__group > summary,
.has-dark-hero .nav .btn--solid {
  transition: background-color var(--dur-slow) var(--ease-out),
              border-color var(--dur-slow) var(--ease-out),
              color var(--dur-slow) var(--ease-out);
}
@media (max-width: 900px) {
  .has-dark-hero .nav__panel { color: var(--color-ink-2); }
  .has-dark-hero .nav__panel .nav__link,
  .has-dark-hero .nav__panel .nav__group > summary { color: var(--color-ink-2); }
  .has-dark-hero .nav__panel .btn--solid { background: var(--color-accent); color: var(--color-on-accent); }
}

/* =========================================================================
   LEDGER: the hero's signature element.
   Rows assemble once on load, a rule draws, the single declaration lands last.
   Every value on it is a real published VAT rate. No invented numbers.
   ========================================================================= */
.ledger {
  border: var(--rule-hair) solid var(--color-graphite-rule);
  border-radius: var(--radius-lg);
  background: var(--color-graphite-2);
  padding: var(--space-md) var(--space-lg) var(--space-lg);
}
.ledger__head {
  font-family: var(--font-mono); font-size: var(--text-xs); font-weight: 500;
  letter-spacing: var(--tracking-label); text-transform: uppercase;
  color: var(--color-on-graphite-2); padding-bottom: var(--space-xs);
  border-bottom: var(--rule-hair) solid var(--color-graphite-rule);
}
.ledger__rows { list-style: none; }
.ledger__rows li {
  display: flex; align-items: baseline; gap: var(--space-2xs);
  padding-block: 0.55rem;
  border-bottom: var(--rule-hair) solid var(--color-graphite-rule);
}
.ledger__cc {
  font-family: var(--font-mono); font-size: var(--text-sm); font-weight: 500;
  letter-spacing: 0.06em; color: var(--color-on-graphite-2); flex: none; min-width: 2.4ch;
}
.ledger__name { font-size: var(--text-sm); color: var(--color-on-graphite-2); flex: none; }
.ledger__dots { flex: 1 1 auto; height: 1px; background: var(--color-graphite-rule); min-width: var(--space-sm); }
.ledger__val {
  font-family: var(--font-mono); font-size: var(--text-lg); font-weight: 500;
  font-variant-numeric: tabular-nums; color: var(--color-on-graphite); flex: none;
}
.ledger__more {
  font-size: var(--text-sm); color: var(--color-on-graphite-2);
  border-bottom: none !important; padding-bottom: var(--space-sm) !important;
}
.ledger__rule { height: 2px; background: var(--color-accent-on-dark); transform-origin: left; }
.ledger__out {
  display: flex; align-items: baseline; gap: var(--space-2xs); flex-wrap: wrap;
  padding-top: var(--space-sm); font-size: var(--text-sm); color: var(--color-on-graphite-2);
}
.ledger__outk {
  font-family: var(--font-mono); font-size: var(--text-lg); font-weight: 500;
  letter-spacing: 0.03em; color: var(--color-accent-on-dark);
}

/* assemble: pure CSS, runs once, no JS dependency, no loop */
@keyframes led-row { from { opacity: 0; transform: translateY(8px); } }
@keyframes led-rule { from { transform: scaleX(0); } }
@keyframes led-out { from { opacity: 0; transform: translateY(6px); } }
/* Opoznienia licza sie z nth-child, nie z atrybutu style="--i".
   CSP tej strony to style-src 'self', wiec inline style sa blokowane i stagger
   po cichu przestawal dzialac na produkcji, mimo ze lokalnie wygladal poprawnie. */
.ledger__rows li { animation: led-row var(--dur-assemble) var(--ease-out) both; }
.ledger__rows li:nth-child(1) { animation-delay: 240ms; }
.ledger__rows li:nth-child(2) { animation-delay: 310ms; }
.ledger__rows li:nth-child(3) { animation-delay: 380ms; }
.ledger__rows li:nth-child(4) { animation-delay: 450ms; }
.ledger__rows li:nth-child(5) { animation-delay: 520ms; }
.ledger__rows li:nth-child(6) { animation-delay: 590ms; }
.ledger__rows li:nth-child(7) { animation-delay: 660ms; }
.ledger__rule { animation: led-rule 560ms var(--ease-out) both; animation-delay: 900ms; }
.ledger__out { animation: led-out var(--dur-assemble) var(--ease-out) both; animation-delay: 1180ms; }

/* =========================================================================
   REDUCED MOTION: one place, overrides everything above.
   ========================================================================= */
@media (prefers-reduced-motion: reduce) {
  ::view-transition-old(root), ::view-transition-new(root) { animation: none; }
  .js .reveal, .js .reveal-group > * { opacity: 1 !important; transform: none !important; transition: opacity 120ms linear; }
  .js .steps.reveal-group .step::before { transform: scaleY(1) !important; transition: none; }
  .ledger__rows li, .ledger__rule, .ledger__out { animation: none; opacity: 1; transform: none; }
  .hero__glow, .flow-path, .section__glow, .flow-path-light { animation: none; }
  a.card:hover, .btn--solid:hover, .btn--chip:hover { transform: none; }
  .tlink::after, .nav__link::after, .nav__group > summary::before { transition: none; }
}

/* Panel rozwijanego menu ma jasne tlo, wiec na stronie z ciemnym hero nie moze
   dziedziczyc jasnego koloru tekstu z paska. Ustawiane wprost, nie przez dziedziczenie. */
.has-dark-hero .nav__drop { color: var(--color-ink-2); }
.has-dark-hero .nav__drop a { color: var(--color-ink-2); }
.has-dark-hero .nav__drop small { color: var(--color-ink-3); }

/* utilities */
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-2xl); }