/* ==========================================================================
   Amperfield — amperfield.com
   Design system: designmd "nvidia" — retinted to slate navy + amber.
   Two-mode surface architecture (dark chapter / paper-white body),
   2px radius everywhere, hairline borders, no shadows, no gradients.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Accent — single accent carries every CTA, active state, corner square */
  --primary: #ffb020;
  --primary-dark: #e09300;
  --on-primary: #0d1b2a;

  /* Surface */
  --canvas: #ffffff;
  --surface-soft: #f4f6f8;
  --surface-dark: #0d1b2a;
  --surface-elevated: #14273a;

  /* Rules */
  --hairline: #d5dae0;
  --hairline-soft: #e6eaee;
  --hairline-strong: #2e4459;

  /* Text */
  --ink: #0d1b2a;
  --body: #22303f;
  --mute: #556474;
  --on-dark: #ffffff;
  --on-dark-mute: rgba(255, 255, 255, 0.72);
  --on-dark-faint: rgba(255, 255, 255, 0.5);

  /* Semantic */
  --link: #0f4c8a;
  --error: #c62828;
  --error-soft: #fbeaea;

  /* Data-viz only */
  --viz-grid: #e2e6ea;
  --viz-grid-dark: #27405a;

  /* Radius — aggressively angular */
  --r-none: 0px;
  --r-sm: 2px;

  /* Spacing — 8px base */
  --s-xs: 4px;
  --s-sm: 8px;
  --s-md: 12px;
  --s-lg: 16px;
  --s-xl: 24px;
  --s-xxl: 32px;
  --s-section: 64px;

  --maxw: 1280px;
  --gutter: 24px;

  --ease: cubic-bezier(0.2, 0, 0.2, 1);
  --dur: 120ms;
}

/* --------------------------------------------------------------------------
   2. Reset & base
   -------------------------------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--canvas);
  color: var(--body);
  font-family: Inter, Arial, Helvetica, sans-serif;
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  font-variant-numeric: tabular-nums;
}

h1, h2, h3, h4 {
  margin: 0;
  color: var(--ink);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg { max-width: 100%; }
svg { display: block; }

a { color: var(--link); }

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--primary);
  color: var(--on-primary);
  padding: 12px 20px;
  font-weight: 700;
  border-radius: var(--r-sm);
}
.skip-link:focus { left: 8px; top: 8px; }

/* --------------------------------------------------------------------------
   3. Layout primitives
   -------------------------------------------------------------------------- */
.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.section { padding: var(--s-section) 0; }
.section--dark {
  background: var(--surface-dark);
  color: var(--on-dark-mute);
}
.section--soft { background: var(--surface-soft); }
.section--dark h2,
.section--dark h3,
.section--dark h4 { color: var(--on-dark); }

.rule { height: 1px; background: var(--hairline); border: 0; margin: 0; }

/* Section head: numbered eyebrow + title + deck, editorial grid */
.sec-head {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: var(--s-xxl);
  align-items: end;
  padding-bottom: var(--s-xxl);
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: var(--s-sm);
  margin: 0 0 var(--s-md);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.43;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--mute);
}
.eyebrow::before {
  content: "";
  width: 10px; height: 10px;
  background: var(--primary);
  flex: none;
}
.section--dark .eyebrow { color: var(--on-dark-faint); }

.sec-title { font-size: 36px; }
.deck {
  font-size: 18px;
  line-height: 1.6;
  color: var(--body);
  max-width: 62ch;
}
.section--dark .deck { color: var(--on-dark-mute); }

/* --------------------------------------------------------------------------
   4. Chrome — utility bar, nav
   -------------------------------------------------------------------------- */
.utility {
  background: var(--surface-dark);
  border-bottom: 1px solid var(--hairline-strong);
  color: var(--on-dark-faint);
  font-size: 12px;
  line-height: 1.25;
}
.utility .wrap {
  min-height: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-lg);
}
.utility a { color: var(--on-dark-mute); text-decoration: none; }
.utility a:hover { color: var(--primary); }
.utility__loc { letter-spacing: 0.04em; text-transform: uppercase; }

.nav {
  background: var(--surface-dark);
  position: sticky;
  top: 0;
  z-index: 40;
}
.nav__bar {
  min-height: 64px;
  display: flex;
  align-items: center;
  gap: var(--s-xl);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--on-dark);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
  flex: none;
}
.brand__mark { width: 26px; height: 26px; flex: none; }
.brand__name { white-space: nowrap; }

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--s-xs);
  margin-left: auto;
}
.nav__links a:not(.btn) {
  display: block;
  padding: 10px 14px;
  color: var(--on-dark-mute);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  border-radius: var(--r-sm);
  border-bottom: 2px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.nav__links a:not(.btn):hover { color: var(--on-dark); border-bottom-color: var(--primary); }
.nav__links a:not(.btn)[aria-current="page"] { color: var(--on-dark); border-bottom-color: var(--primary); }

.nav__cta { margin-left: var(--s-md); }

.nav__toggle {
  display: none;
  margin-left: auto;
  align-items: center;
  gap: var(--s-sm);
  background: transparent;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-sm);
  color: var(--on-dark);
  font: inherit;
  font-size: 14px;
  font-weight: 700;
  padding: 10px 14px;
  min-height: 44px;
  cursor: pointer;
}
.nav__toggle svg { width: 16px; height: 16px; }

/* --------------------------------------------------------------------------
   5. Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-sm);
  min-height: 44px;
  padding: 11px 24px;
  border-radius: var(--r-sm);
  border: 2px solid transparent;
  font-family: inherit;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.25;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.btn--primary {
  background: var(--primary);
  color: var(--on-primary);
}
.btn--primary:hover { background: var(--primary-dark); }
.btn--primary:active { background: var(--primary-dark); }

.btn--outline {
  background: transparent;
  color: var(--ink);
  border-color: var(--primary);
}
.btn--outline:hover { background: var(--primary); color: var(--on-primary); }

.btn--outline-dark {
  background: transparent;
  color: var(--on-dark);
  border-color: rgba(255, 255, 255, 0.55);
}
.btn--outline-dark:hover { border-color: var(--on-dark); background: rgba(255, 255, 255, 0.08); }

.btn--sm { min-height: 40px; padding: 8px 16px; font-size: 14px; letter-spacing: 0.01em; }
.btn--block { width: 100%; }

.ghost-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--link);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  border-radius: var(--r-none);
}
.ghost-link::after { content: "\2192"; }
.ghost-link:hover { text-decoration: underline; }
.section--dark .ghost-link,
.hero .ghost-link,
.card--dark .ghost-link,
.cta-strip .ghost-link,
.footer .ghost-link { color: var(--primary); }

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-md);
}

/* --------------------------------------------------------------------------
   6. Hero chapter
   -------------------------------------------------------------------------- */
.hero {
  background: var(--surface-dark);
  color: var(--on-dark-mute);
  padding: 72px 0 0;
  border-bottom: 1px solid var(--hairline-strong);
}
.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 48px;
  align-items: center;
  padding-bottom: 56px;
}
.hero__copy { max-width: 30rem; }
.hero h1 {
  color: var(--on-dark);
  font-size: 48px;
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin-bottom: var(--s-xl);
}
.hero__sub {
  font-size: 18px;
  line-height: 1.7;
  color: var(--on-dark-mute);
  margin-bottom: var(--s-xxl);
}
.hero__note {
  margin-top: var(--s-xl);
  font-size: 13px;
  line-height: 1.6;
  color: var(--on-dark-faint);
  border-left: 2px solid var(--primary);
  padding-left: var(--s-md);
}

/* Figure frame — the recurring "chart is the hero image" container */
.figure {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--r-sm);
  padding: var(--s-xl);
}
.figure--dark {
  background: var(--surface-elevated);
  border-color: var(--hairline-strong);
}
.figure__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--s-sm);
  padding-bottom: var(--s-lg);
  margin-bottom: var(--s-lg);
  border-bottom: 1px solid var(--hairline);
}
.figure--dark .figure__head { border-bottom-color: var(--hairline-strong); }
.figure__title {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.01em;
}
.figure--dark .figure__title { color: var(--on-dark); }
.figure__caption {
  margin-top: var(--s-lg);
  padding-top: var(--s-md);
  border-top: 1px solid var(--hairline-soft);
  font-size: 12px;
  line-height: 1.5;
  color: var(--mute);
}
.figure--dark .figure__caption {
  border-top-color: var(--hairline-strong);
  color: var(--on-dark-faint);
}

.tag {
  display: inline-block;
  background: var(--surface-soft);
  color: var(--body);
  border-radius: var(--r-sm);
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
}
.tag--dark {
  background: transparent;
  border: 1px solid var(--hairline-strong);
  color: var(--on-dark-mute);
}

/* Hero KPI strip inside the dark chapter */
.kpis {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--hairline-strong);
}
.kpi {
  display: flex;
  flex-direction: column-reverse;
  justify-content: flex-end;
  padding: var(--s-xl) var(--s-xl) var(--s-xl) 0;
  border-right: 1px solid var(--hairline-strong);
}
.kpi:last-child { border-right: 0; }
.kpi:not(:first-child) { padding-left: var(--s-xl); }
.kpi__val {
  margin: 0;
  font-size: 30px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--on-dark);
}
.kpi__val span { font-size: 14px; font-weight: 700; color: var(--on-dark-mute); }
.kpi__label {
  margin-top: var(--s-sm);
  font-size: 12px;
  line-height: 1.4;
  color: var(--on-dark-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.kpis__foot {
  padding: var(--s-md) 0 var(--s-xxl);
  font-size: 12px;
  color: var(--on-dark-faint);
}

/* --------------------------------------------------------------------------
   7. Cards & grids
   -------------------------------------------------------------------------- */
.grid { display: grid; gap: var(--s-xl); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.split {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: 48px;
  align-items: start;
}
.split--rev { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }

.card {
  position: relative;
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--r-sm);
  padding: var(--s-xxl);
}
.card--dark {
  background: var(--surface-elevated);
  border-color: var(--hairline-strong);
  color: var(--on-dark-mute);
}
.card--dark h2,
.card--dark h3,
.card--dark h4 { color: var(--on-dark); }
.card--dark .card__idx { color: var(--on-dark-faint); }
.card__corner {
  position: absolute;
  top: 0; left: 0;
  width: 12px; height: 12px;
  background: var(--primary);
}
.card__idx {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--mute);
  margin-bottom: var(--s-md);
}
.card h3 {
  font-size: 20px;
  margin-bottom: var(--s-md);
}
.card p { font-size: 15px; line-height: 1.67; color: var(--body); }
.card--dark p { color: var(--on-dark-mute); }
.card__icon { margin-bottom: var(--s-lg); }
.card__icon svg { width: 30px; height: 30px; }

/* Problem list — hairline-separated editorial rows */
.claims { border-top: 1px solid var(--hairline); }
.claim {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: var(--s-xl);
  padding: var(--s-xl) 0;
  border-bottom: 1px solid var(--hairline);
}
.claim__n {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--primary-dark);
  padding-top: 3px;
}
.claim h3 { font-size: 18px; margin-bottom: 6px; }
.claim p { font-size: 15px; line-height: 1.67; color: var(--mute); }

/* Spec table — engineering-documentation register */
.spec {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}
.spec caption {
  text-align: left;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mute);
  padding-bottom: var(--s-md);
}
.spec th,
.spec td {
  text-align: left;
  padding: 12px var(--s-lg) 12px 0;
  border-bottom: 1px solid var(--hairline);
  vertical-align: top;
}
.spec thead th {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mute);
  border-bottom: 1px solid var(--ink);
}
.spec tbody th { font-weight: 700; color: var(--ink); width: 34%; }
.spec td { color: var(--body); }
.spec td:last-child, .spec th:last-child { padding-right: 0; }

/* Steps */
.steps { counter-reset: step; border-top: 1px solid var(--hairline); }
.step {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--s-xl);
  padding: var(--s-xl) 0;
  border-bottom: 1px solid var(--hairline);
  align-items: start;
}
.step__n {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--ink);
  border-left: 2px solid var(--primary);
  padding-left: var(--s-md);
}
.step h3 { font-size: 18px; }
.step p { font-size: 15px; line-height: 1.67; color: var(--mute); }
.step__out {
  font-size: 13px;
  color: var(--mute);
}
.step__out strong { color: var(--ink); display: block; font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 4px; }

/* Bullet list with amber ticks */
.ticks li {
  position: relative;
  padding-left: 26px;
  margin-bottom: var(--s-md);
  font-size: 15px;
  line-height: 1.6;
}
.ticks li::before {
  content: "";
  position: absolute;
  left: 0; top: 8px;
  width: 8px; height: 8px;
  background: var(--primary);
}
.ticks li:last-child { margin-bottom: 0; }

/* --------------------------------------------------------------------------
   8. Monitoring dashboard mock
   -------------------------------------------------------------------------- */
.mock {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--r-sm);
  overflow: hidden;
}
.mock__chrome {
  display: flex;
  align-items: center;
  gap: var(--s-md);
  background: var(--surface-dark);
  padding: 10px var(--s-lg);
  border-bottom: 1px solid var(--hairline-strong);
}
.mock__dot { width: 8px; height: 8px; background: var(--primary); flex: none; }
.mock__path {
  font-size: 12px;
  color: var(--on-dark-mute);
  letter-spacing: 0.04em;
}
.mock__path b { color: var(--on-dark); font-weight: 700; }
.mock__tabs { margin-left: auto; display: flex; gap: var(--s-xs); }
.mock__tab {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--on-dark-mute);
  padding: 5px 10px;
  border-radius: var(--r-sm);
}
.mock__tab--on { background: var(--primary); color: var(--on-primary); }

.mock__tiles {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-bottom: 1px solid var(--hairline);
}
.mock__tile {
  padding: var(--s-lg);
  border-right: 1px solid var(--hairline);
}
.mock__tile:last-child { border-right: 0; }
.mock__tile dt {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--mute);
  margin-bottom: 6px;
}
.mock__tile dd {
  margin: 0;
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.mock__tile dd small { font-size: 13px; font-weight: 700; color: var(--mute); }
.mock__tile--alert dd { color: var(--error); }

.mock__body { padding: var(--s-lg); }

.mock__alert {
  display: flex;
  align-items: flex-start;
  gap: var(--s-md);
  margin: var(--s-lg) 0 0;
  padding: var(--s-md);
  background: var(--error-soft);
  border-left: 3px solid var(--error);
  border-radius: var(--r-sm);
  font-size: 13px;
  line-height: 1.5;
  color: var(--body);
}
.mock__alert b { color: var(--error); }

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-lg);
  padding-top: var(--s-md);
  font-size: 12px;
  color: var(--mute);
}
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend i { width: 14px; height: 3px; display: inline-block; flex: none; }
.legend .k-amber { background: var(--primary); }
.legend .k-navy { background: var(--ink); }
.legend .k-dash {
  background: transparent;
  border-top: 3px dashed var(--ink);
  height: 0;
}
.legend .k-red { background: var(--error); }

/* --------------------------------------------------------------------------
   9. Pricing
   -------------------------------------------------------------------------- */
.price {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--r-sm);
  padding: var(--s-xxl);
}
.price--lead { border-color: var(--ink); border-width: 1px; }
.price__name { font-size: 20px; margin-bottom: var(--s-xs); }
.price__who { font-size: 13px; color: var(--mute); margin-bottom: var(--s-xl); }
.price__fig {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--ink);
}
.price__unit { font-size: 14px; font-weight: 700; color: var(--mute); margin-top: 6px; }
.price__rule { margin: var(--s-xl) 0; height: 1px; background: var(--hairline); }
.price ul { margin-bottom: var(--s-xl); }
.price .btn { margin-top: auto; }

.faq { border-top: 1px solid var(--hairline); }
.faq details {
  border-bottom: 1px solid var(--hairline);
}
.faq summary {
  list-style: none;
  cursor: pointer;
  padding: var(--s-lg) 40px var(--s-lg) 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 8px; top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-dark);
}
.faq details[open] summary::after { content: "\2013"; }
.faq p {
  padding: 0 40px var(--s-lg) 0;
  font-size: 15px;
  line-height: 1.67;
  color: var(--mute);
  max-width: 70ch;
}

/* --------------------------------------------------------------------------
   10. Credibility
   -------------------------------------------------------------------------- */
.pending {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--r-sm);
  padding: var(--s-xl);
}
.pending__val {
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--mute);
  letter-spacing: -0.02em;
}
.pending .tag { margin-top: var(--s-sm); }
.pending__label {
  margin-top: var(--s-md);
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.4;
}
.pending__meta {
  margin-top: 6px;
  font-size: 12px;
  color: var(--mute);
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   11. CTA strip
   -------------------------------------------------------------------------- */
.cta-strip {
  background: var(--surface-dark);
  color: var(--on-dark-mute);
  padding: var(--s-section) 0;
}
.cta-strip__grid {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: var(--s-xxl);
  align-items: center;
}
.cta-strip h2 { font-size: 30px; color: var(--on-dark); margin-bottom: var(--s-md); }
.cta-strip p { color: var(--on-dark-mute); font-size: 16px; max-width: 52ch; }
.cta-strip .btn-row { justify-content: flex-end; }

/* --------------------------------------------------------------------------
   12. Footer
   -------------------------------------------------------------------------- */
.footer {
  background: var(--surface-dark);
  color: var(--on-dark-mute);
  border-top: 1px solid var(--hairline-strong);
  padding: var(--s-section) 0 0;
}
.footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 2.2fr) repeat(4, minmax(0, 1fr));
  gap: var(--s-xxl);
  padding-bottom: var(--s-section);
}
.footer__about { max-width: 26rem; }
.footer__about p {
  margin-top: var(--s-lg);
  font-size: 14px;
  line-height: 1.7;
  color: var(--on-dark-mute);
}
.footer h4 {
  color: var(--on-dark);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--s-lg);
}
.footer li { margin-bottom: 10px; }
.footer li a {
  color: var(--on-dark-mute);
  font-size: 15px;
  text-decoration: none;
}
.footer li a:hover { color: var(--primary); text-decoration: underline; }
.footer__meta {
  border-top: 1px solid var(--hairline-strong);
  padding: var(--s-xl) 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-lg);
  justify-content: space-between;
  align-items: center;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--on-dark-faint);
}
.footer__meta a { color: var(--on-dark-faint); text-decoration: none; }
.footer__meta a:hover { color: var(--primary); }

/* --------------------------------------------------------------------------
   13. Interior page — breadcrumb + form
   -------------------------------------------------------------------------- */
.crumbs {
  background: var(--surface-soft);
  border-bottom: 1px solid var(--hairline);
}
.crumbs .wrap {
  min-height: 48px;
  display: flex;
  align-items: center;
  gap: var(--s-sm);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--body);
}
.crumbs a { color: var(--link); text-decoration: none; }
.crumbs a:hover { text-decoration: underline; }
.crumbs span[aria-hidden] { color: var(--mute); }

.page-head { padding: var(--s-section) 0 var(--s-xxl); }
.page-head h1 {
  font-size: 42px;
  letter-spacing: -0.025em;
  margin-bottom: var(--s-lg);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--s-xl);
}
.field { display: flex; flex-direction: column; }
.field--full { grid-column: 1 / -1; }
.field label {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink);
  margin-bottom: var(--s-sm);
}
.field .req { color: var(--primary-dark); }
.field .hint {
  font-size: 12px;
  color: var(--mute);
  margin-top: 6px;
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
}

input[type="text"],
input[type="email"],
select,
textarea {
  font-family: inherit;
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink);
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--r-sm);
  padding: 11px 15px;
  min-height: 44px;
  width: 100%;
}
select {
  appearance: none;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8'%3E%3Cpath d='M1 1.5 6 6.5 11 1.5' fill='none' stroke='%23556474' stroke-width='1.6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  background-size: 12px 8px;
  padding-right: 40px;
}
textarea { min-height: 148px; resize: vertical; }

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: inset 0 0 0 1px var(--primary);
}
input[aria-invalid="true"],
select[aria-invalid="true"],
textarea[aria-invalid="true"] { border-color: var(--error); }

.err {
  display: none;
  margin-top: 6px;
  font-size: 13px;
  font-weight: 700;
  color: var(--error);
}
.err.is-on { display: block; }

.form-foot {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s-lg);
  padding-top: var(--s-sm);
}
.form-foot p { font-size: 13px; color: var(--mute); max-width: 40ch; }

.form-status {
  display: none;
  border: 1px solid var(--ink);
  border-left: 4px solid var(--primary);
  border-radius: var(--r-sm);
  padding: var(--s-xl);
  background: var(--surface-soft);
}
.form-status.is-on { display: block; }
.form-status h2 { font-size: 20px; margin-bottom: var(--s-sm); }
.form-status p { font-size: 15px; color: var(--body); line-height: 1.6; }

.contact-aside .card + .card { margin-top: var(--s-xl); }
.contact-list { font-size: 15px; }
.contact-list dt {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mute);
  margin-bottom: 4px;
}
.contact-list dd { margin: 0 0 var(--s-lg); color: var(--ink); }
.contact-list dd:last-child { margin-bottom: 0; }
.contact-list a { color: var(--link); font-weight: 700; }

.next-list { counter-reset: nx; }
.next-list li {
  counter-increment: nx;
  position: relative;
  padding-left: 34px;
  margin-bottom: var(--s-lg);
  font-size: 15px;
  line-height: 1.6;
  color: var(--body);
}
.next-list li:last-child { margin-bottom: 0; }
.next-list li::before {
  content: counter(nx, decimal-leading-zero);
  position: absolute;
  left: 0; top: 1px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--on-primary);
  background: var(--primary);
  width: 22px; height: 22px;
  display: flex; align-items: center; justify-content: center;
}

/* --------------------------------------------------------------------------
   14. Chart helpers (inline SVG)
   -------------------------------------------------------------------------- */
.chart-scroll { overflow-x: auto; }
.chart { width: 100%; height: auto; }
.chart text { font-family: Inter, Arial, sans-serif; font-variant-numeric: tabular-nums; }
.c-grid { stroke: var(--viz-grid); stroke-width: 1; }
.c-grid-d { stroke: var(--viz-grid-dark); stroke-width: 1; }
.c-axis { stroke: var(--ink); stroke-width: 1.5; }
.c-axis-d { stroke: #7d93a8; stroke-width: 1.5; }
.c-lab { fill: var(--mute); font-size: 11px; font-weight: 700; letter-spacing: 0.04em; }
.c-lab-d { fill: #9db0c2; font-size: 11px; font-weight: 700; letter-spacing: 0.04em; }
.c-note { fill: var(--ink); font-size: 12px; font-weight: 700; }
.c-note-d { fill: #ffffff; font-size: 12px; font-weight: 700; }

/* --------------------------------------------------------------------------
   15. Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 1100px) {
  .hero__grid { grid-template-columns: minmax(0, 1fr); gap: var(--s-xxl); }
  .hero__copy { max-width: 34rem; }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer__about { grid-column: 1 / -1; max-width: 40rem; }
}

@media (max-width: 900px) {
  :root { --s-section: 48px; }

  .nav__links {
    display: none;
    position: absolute;
    left: 0; right: 0; top: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--surface-elevated);
    border-top: 1px solid var(--hairline-strong);
    padding: var(--s-sm) var(--gutter) var(--s-xl);
  }
  .nav__links.is-open { display: flex; }
  .nav__links a:not(.btn) {
    padding: 14px 0;
    border-bottom: 1px solid var(--hairline-strong);
    font-size: 16px;
  }
  .nav__links a:not(.btn):hover,
  .nav__links a:not(.btn)[aria-current="page"] { border-bottom-color: var(--primary); }
  .nav__links .nav__cta { margin: var(--s-lg) 0 0; }
  .nav { position: relative; }
  .nav__bar { position: relative; }
  .nav__toggle { display: inline-flex; }

  .sec-head { grid-template-columns: minmax(0, 1fr); gap: var(--s-lg); align-items: start; }
  .sec-title { font-size: 30px; }
  .split, .split--rev { grid-template-columns: minmax(0, 1fr); gap: var(--s-xxl); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .step { grid-template-columns: 56px minmax(0, 1fr); }
  .step__out { grid-column: 2; }
  .cta-strip__grid { grid-template-columns: minmax(0, 1fr); gap: var(--s-xl); }
  .cta-strip .btn-row { justify-content: flex-start; }
  .page-head h1 { font-size: 34px; }
  .mock__tiles { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .mock__tile:nth-child(2) { border-right: 0; }
  .mock__tile:nth-child(1), .mock__tile:nth-child(2) { border-bottom: 1px solid var(--hairline); }
}

@media (max-width: 700px) {
  /* keep chart labels legible: charts scroll inside their own container */
  .chart-scroll .chart { min-width: 540px; }
  .chart-scroll {
    border-bottom: 1px solid var(--hairline-soft);
    padding-bottom: var(--s-sm);
  }
  .figure--dark .chart-scroll { border-bottom-color: var(--hairline-strong); }

  .hero h1 { font-size: 34px; }
  .kpis { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .kpi { padding: var(--s-lg) var(--s-lg) var(--s-lg) 0; }
  .kpi:nth-child(2n) { border-right: 0; padding-left: var(--s-lg); }
  .kpi:nth-child(3), .kpi:nth-child(4) { border-top: 1px solid var(--hairline-strong); }
  .kpi:nth-child(3) { padding-left: 0; }
  .form-grid { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 560px) {
  :root { --gutter: 16px; --s-section: 40px; }
  .grid { gap: var(--s-lg); }
  .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero h1 { font-size: 30px; }
  .sec-title { font-size: 26px; }
  .card, .price, .figure { padding: var(--s-xl); }
  .claim { grid-template-columns: minmax(0, 1fr); gap: var(--s-sm); }
  .step { grid-template-columns: minmax(0, 1fr); gap: var(--s-sm); }
  .step__out { grid-column: 1; }
  .step__n { border-left: 0; border-top: 2px solid var(--primary); padding: var(--s-sm) 0 0; }
  .mock__tiles { grid-template-columns: minmax(0, 1fr); }
  .mock__tile { border-right: 0; border-bottom: 1px solid var(--hairline); }
  .mock__tile:last-child { border-bottom: 0; }
  .utility .wrap { justify-content: center; }
  .utility__loc { display: none; }
  .price__fig { font-size: 30px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}