/* ==========================================================================
   DSX Technology — page layer.
   Builds on design-system.css. Every section is a "band"; a band exposes
   --ink / --ink-rule / --kicker so the same markup works on light and dark
   grounds without duplicating colour declarations per element.
   ========================================================================== */

html { scroll-behavior: smooth; }
body { font-size: 16px; }
a { color: var(--color-accent-700); }
a:hover { color: var(--color-accent-800); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

.page { background: var(--color-bg); color: var(--color-text); min-height: 100vh; }

/* — band: a full-bleed horizontal section with a colour ground — */
.band {
  --ink: var(--color-text);
  --ink-rule: var(--color-divider);
  --kicker: var(--color-accent-700);
}
.band--dark {
  background: var(--color-accent-900);
  color: var(--color-bg);
  --ink: var(--color-bg);
  --ink-rule: color-mix(in srgb, var(--color-bg) 30%, transparent);
  --kicker: var(--color-accent-300);
}
.band--surface {
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
}
.band--ruled { border-top: 1px solid var(--color-divider); }

.shell { max-width: 1320px; margin: 0 auto; padding: 76px 40px; }
.shell--tight { padding-bottom: 48px; }

.kicker {
  font-family: var(--font-heading);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--kicker);
  margin-bottom: 14px;
}
.lede {
  font-size: 18px;
  line-height: 1.5;
  max-width: 62ch;
  margin: 0;
  color: color-mix(in srgb, var(--ink) 78%, transparent);
}
.prose { color: color-mix(in srgb, var(--ink) 78%, transparent); }
.note { font-size: 14.5px; margin: 0; color: color-mix(in srgb, var(--ink) 74%, transparent); }

/* — display headings — */
.display {
  font-family: var(--font-heading);
  line-height: 0.86;
  letter-spacing: -0.03em;
  margin: 0;
  text-transform: uppercase;
}
.display--hero { font-size: clamp(48px, 10vw, 148px); line-height: 0.85; }
.display--flagship { font-size: clamp(44px, 7.4vw, 112px); }
.section-title {
  font-family: var(--font-heading);
  font-size: clamp(38px, 5vw, 56px);
  line-height: 0.92;
  letter-spacing: -0.02em;
  margin: 0;
  text-transform: uppercase;
}
.accent-word { color: var(--color-accent-400); }

/* ── Header ─────────────────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--color-accent-900);
  color: var(--color-bg);
  border-bottom: 1px solid color-mix(in srgb, var(--color-bg) 22%, transparent);
}
.site-header__inner {
  max-width: 1320px;
  margin: 0 auto;
  padding: 16px 40px;
  display: flex;
  align-items: center;
  gap: 32px;
}
.brand {
  font-family: var(--font-heading);
  font-size: 24px;
  letter-spacing: 0.08em;
  margin-right: auto;
  text-decoration: none;
  color: inherit;
}
.site-nav {
  display: flex;
  gap: 26px;
  font-family: var(--font-heading);
  font-size: 14px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.site-nav a { color: var(--color-accent-200); text-decoration: none; }
.site-nav a:hover,
.site-nav a[aria-current="true"] { color: var(--color-bg); }

/* A button reading as the inverse of a dark ground. */
.btn--onDark {
  background: var(--color-bg);
  color: var(--color-accent-900);
  border-color: var(--color-bg);
}
.btn--onDark:hover { background: var(--color-accent-100); color: var(--color-accent-900); }
.btn--outlineOnDark {
  border-color: color-mix(in srgb, var(--color-bg) 45%, transparent);
  color: var(--color-bg);
}
.btn--outlineOnDark:hover { background: color-mix(in srgb, var(--color-bg) 12%, transparent); }
.btn--lg { font-size: 16px; padding: 14px 24px; }

/* — mobile nav toggle: hidden until the nav can no longer sit on one line — */
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  padding: 0;
  background: transparent;
  border: 1px solid color-mix(in srgb, var(--color-bg) 45%, transparent);
  color: var(--color-bg);
  cursor: pointer;
}

/* ── Hero ───────────────────────────────────────────────────────────────── */
.hero__eyebrow {
  font-family: var(--font-heading);
  font-size: 13px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-accent-300);
  margin-bottom: 28px;
}
.hero__foot {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 56px;
  margin-top: 44px;
  padding-top: 32px;
  border-top: 1px solid var(--ink-rule);
}
.hero__claim {
  font-size: 21px;
  line-height: 1.45;
  margin: 0;
  color: color-mix(in srgb, var(--color-bg) 90%, transparent);
}
.hero__actions {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  justify-content: flex-end;
  flex-wrap: wrap;
}

/* ── Marquee ────────────────────────────────────────────────────────────── */
@keyframes dsx-marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}
.marquee {
  overflow: hidden;
  border-top: 1px solid var(--color-accent-900);
  border-bottom: 1px solid var(--color-accent-900);
}
.marquee__track {
  display: flex;
  width: max-content;
  animation: dsx-marquee 32s linear infinite;
  font-family: var(--font-heading);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.marquee__run { display: flex; gap: 40px; padding-right: 40px; }
.marquee--standards {
  background: var(--color-accent-400);
  color: var(--color-accent-900);
}
.marquee--standards .marquee__track { font-size: 19px; padding: 11px 0; }
.marquee--materials {
  background: var(--color-accent-200);
  color: var(--color-accent-800);
}
.marquee--materials .marquee__track {
  font-size: 17px;
  letter-spacing: 0.16em;
  padding: 10px 0;
  animation-duration: 36s;
}
.marquee--materials .marquee__run { gap: 36px; padding-right: 36px; }
@media (prefers-reduced-motion: reduce) {
  .marquee { overflow-x: auto; }
  .marquee__track { animation: none; }
}

/* ── Split intro (title left, lede right) ───────────────────────────────── */
.split-intro {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 56px;
  align-items: end;
  margin-bottom: 40px;
}
.split-lead {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 56px;
  align-items: end;
}

/* ── Rail: a ruled row of numbered columns ──────────────────────────────── */
.rail {
  display: grid;
  border-top: 3px solid var(--color-accent-900);
}
.rail--4 { grid-template-columns: repeat(4, 1fr); }
.rail--3 { grid-template-columns: repeat(3, 1fr); }
.rail--2 { grid-template-columns: repeat(2, 1fr); }
.rail__cell {
  padding: 26px;
  border-right: 1px solid var(--color-divider);
}
.rail__cell:first-child { padding-left: 0; }
.rail__cell:last-child { padding-right: 0; border-right: 0; }
.rail__num {
  font-family: var(--font-heading);
  font-size: 60px;
  line-height: 0.9;
  color: var(--color-accent-700);
}
.rail__num--strong { color: var(--color-accent-900); }
.rail__title {
  font-size: 28px;
  margin: 12px 0 6px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.rail__body {
  font-size: 14.5px;
  margin: 0;
  color: color-mix(in srgb, var(--ink) 75%, transparent);
}

/* Timeline variant of the rail — a date instead of an index. */
.rail__date {
  font-family: var(--font-heading);
  font-size: 40px;
  line-height: 0.95;
  color: var(--color-accent-700);
}
.rail__date--now { color: var(--color-accent-900); }
.rail__subtitle {
  font-size: 24px;
  margin: 10px 0 6px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ── Steps (verify / trust / act) ───────────────────────────────────────── */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.step { border-top: 2px solid var(--color-accent); padding-top: 16px; }
.step__num {
  font-family: var(--font-heading);
  font-size: 44px;
  line-height: 1;
  color: var(--color-accent-700);
}
.step__title {
  margin: 8px 0 6px;
  font-size: 26px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.step__body {
  font-size: 14.5px;
  margin: 0;
  color: color-mix(in srgb, var(--ink) 72%, transparent);
}

/* ── Element tiles (periodic symbols) ───────────────────────────────────── */
.elements {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  border-top: 1px solid var(--ink-rule);
  border-bottom: 1px solid var(--ink-rule);
  margin-top: 48px;
}
.element {
  padding: 20px 12px;
  border-right: 1px solid color-mix(in srgb, var(--color-bg) 20%, transparent);
}
.element:last-child { border-right: 0; }
.element__symbol { font-family: var(--font-heading); font-size: 44px; line-height: 1; }
.element__name {
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent-300);
}

/* ── VeriV body ─────────────────────────────────────────────────────────── */
.veriv-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  margin-top: 48px;
  align-items: start;
}
.veriv-standfirst {
  font-family: var(--font-heading);
  font-size: 26px;
  line-height: 1.15;
  margin: 0 0 14px;
  color: var(--color-accent-200);
}
.veriv-body {
  font-size: 17px;
  line-height: 1.6;
  margin: 0 0 16px;
  color: color-mix(in srgb, var(--color-bg) 82%, transparent);
}

/* Figure 01 — the blueprint diagram. */
.figure-plate {
  border-color: var(--ink-rule);
  margin-top: 36px;
  padding: 24px;
}
.figure-plate .corner { color: color-mix(in srgb, var(--color-bg) 60%, transparent); }
.figure-plate__label {
  font-family: var(--font-heading);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent-300);
  margin-bottom: 18px;
}
.figure-plate__diagram { width: 100%; height: auto; display: block; }
.figure-plate__legend {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid color-mix(in srgb, var(--color-bg) 26%, transparent);
  font-size: inherit;
  color: inherit;
}
.legend__term {
  font-family: var(--font-heading);
  font-size: 17px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent-200);
}
.legend__def {
  font-size: 14px;
  line-height: 1.45;
  color: color-mix(in srgb, var(--color-bg) 72%, transparent);
}

/* Chain of custody — numbered ledger rows. */
.chain { margin: 0; }
.chain__row {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 20px;
  padding: 18px 0;
  border-top: 1px solid color-mix(in srgb, var(--color-bg) 26%, transparent);
}
.chain__row:last-child { border-bottom: 1px solid color-mix(in srgb, var(--color-bg) 26%, transparent); }
.chain__num {
  font-family: var(--font-heading);
  font-size: 34px;
  line-height: 0.9;
  color: var(--color-accent-400);
  margin: 0;
}
.chain__body { margin: 0; }
.chain__title {
  font-family: var(--font-heading);
  font-size: 24px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.chain__text { font-size: 14.5px; color: color-mix(in srgb, var(--color-bg) 74%, transparent); }

.audience { display: grid; gap: 22px; margin-top: 32px; }
.audience__title {
  font-size: 22px;
  margin: 0 0 4px;
  color: var(--color-accent-200);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.audience__body {
  font-size: 14.5px;
  margin: 0;
  color: color-mix(in srgb, var(--color-bg) 74%, transparent);
}

/* ── Standards table ────────────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; }
.standards-table { font-size: 15px; min-width: 640px; }
.standards-table td:first-child { font-family: var(--font-heading); font-size: 19px; }

/* ── Company ────────────────────────────────────────────────────────────── */
.people {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}
.person { padding: 28px; display: flex; gap: 24px; align-items: flex-start; }
.person__portrait {
  flex: none;
  width: 104px;
  height: 130px;
  border: 1px solid var(--color-divider);
}
.person__portrait img { width: 100%; height: 100%; object-fit: cover; }
.person__name {
  font-family: var(--font-heading);
  font-size: 28px;
  margin: 0 0 2px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.person__role {
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent-700);
  margin-bottom: 12px;
}
.person__bio {
  font-size: 14.5px;
  margin: 0;
  color: color-mix(in srgb, var(--ink) 78%, transparent);
}

.sectors {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
}
.sector { padding: 24px; border-right: 1px solid var(--color-divider); }
.sector:first-child { padding-left: 0; }
.sector:last-child { padding-right: 0; border-right: 0; }
.sector h4 {
  font-size: 24px;
  margin: 0 0 6px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.sector p { font-size: 14px; margin: 0; color: color-mix(in srgb, var(--ink) 70%, transparent); }

/* ── Contact ────────────────────────────────────────────────────────────── */
.contact-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 64px;
  align-items: start;
}
.contact-details {
  border-top: 3px solid var(--color-accent-900);
  padding-top: 20px;
  display: grid;
  gap: 8px;
  font-size: 16px;
  margin: 0;
}
.contact-details dt {
  display: inline-block;
  width: 110px;
  font-family: var(--font-heading);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--color-text) 55%, transparent);
}
.contact-details dd { display: inline; margin: 0; }

.contact-form { padding: 32px; }
.contact-form__fields { display: grid; gap: 16px; }
/* Spam honeypot: off-screen rather than display:none, since some bots skip
   fields they can tell are hidden. Never shown to a person. */
.honeypot {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
.radio-stack { display: flex; flex-direction: column; gap: 8px; margin-top: 4px; }
.form-fineprint {
  font-size: 12px;
  margin: 0;
  color: color-mix(in srgb, var(--color-text) 55%, transparent);
}
.form-status {
  font-size: 14px;
  margin: 0;
  min-height: 1.4em;
  color: var(--color-accent-700);
}
.form-status[data-state="error"] { color: #a13d2f; }

/* ── Footer ─────────────────────────────────────────────────────────────── */
.site-footer { background: var(--color-accent-900); color: var(--color-bg); }
.site-footer__inner {
  max-width: 1320px;
  margin: 0 auto;
  padding: 48px 40px;
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  align-items: baseline;
  justify-content: space-between;
}
.site-footer__brand { font-family: var(--font-heading); font-size: 36px; letter-spacing: 0.06em; }
.site-footer__nav {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  font-family: var(--font-heading);
  font-size: 14px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.site-footer__nav a { color: var(--color-accent-200); text-decoration: none; }
.site-footer__nav a:hover { color: var(--color-bg); }
.site-footer__legal { font-size: 12.5px; color: color-mix(in srgb, var(--color-bg) 60%, transparent); }

/* Utility spacing used by a handful of one-off gaps. */
.mt-64 { margin-top: 64px; }
.mb-64 { margin-bottom: 64px; }
.pb-72 { padding-bottom: 72px; }

/* ══ Responsive ══════════════════════════════════════════════════════════
   The source composition is a fixed 1320px desktop grid. These queries
   collapse it in three steps rather than one, so the numbered rails keep
   their ruled structure at tablet width instead of stacking immediately.
   ══════════════════════════════════════════════════════════════════════ */

@media (max-width: 1100px) {
  .rail--4 { grid-template-columns: repeat(2, 1fr); }
  .rail--4 .rail__cell:nth-child(2) { padding-right: 0; border-right: 0; }
  .rail--4 .rail__cell:nth-child(3) { padding-left: 0; }
  .rail--4 .rail__cell:nth-child(-n+2) { border-bottom: 1px solid var(--color-divider); }
  .sectors { grid-template-columns: repeat(2, 1fr); }
  .sector:nth-child(2) { padding-right: 0; border-right: 0; }
  .sector:nth-child(3) { padding-left: 0; }
  .sector:nth-child(-n+2) { border-bottom: 1px solid var(--color-divider); }
  .elements { grid-template-columns: repeat(3, 1fr); }
  .element:nth-child(3n) { border-right: 0; }
}

@media (max-width: 960px) {
  .shell { padding: 56px 28px; }
  .site-header__inner,
  .site-footer__inner { padding-inline: 28px; }

  .hero__foot,
  .split-intro,
  .split-lead,
  .veriv-grid,
  .contact-grid,
  .people { grid-template-columns: 1fr; gap: 32px; }
  .hero__actions { justify-content: flex-start; }
  .split-intro { margin-bottom: 32px; }

  .steps { grid-template-columns: 1fr; gap: 24px; }
  .figure-plate__legend { grid-template-columns: 1fr; gap: 12px; }
}

@media (max-width: 760px) {
  /* Below this the header nav no longer fits; it becomes a disclosure panel. */
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .site-header__inner { flex-wrap: wrap; gap: 16px; }
  .site-header .btn--onDark { display: none; }
  .site-nav {
    display: none;
    order: 3;
    width: 100%;
    flex-direction: column;
    gap: 0;
    font-size: 16px;
    border-top: 1px solid color-mix(in srgb, var(--color-bg) 22%, transparent);
  }
  .site-nav[data-open="true"] { display: flex; }
  .site-nav a {
    padding: 14px 0;
    border-bottom: 1px solid color-mix(in srgb, var(--color-bg) 14%, transparent);
  }

  .shell { padding: 44px 20px; }
  .site-header__inner,
  .site-footer__inner { padding-inline: 20px; }

  .rail--4,
  .rail--3,
  .rail--2,
  .sectors { grid-template-columns: 1fr; }
  .rail__cell,
  .sector {
    padding: 22px 0;
    border-right: 0;
    border-bottom: 1px solid var(--color-divider);
  }
  .rail__cell:last-child,
  .sector:last-child { border-bottom: 0; }

  .elements { grid-template-columns: repeat(2, 1fr); }
  .element:nth-child(2n) { border-right: 0; }

  .person { flex-direction: column; gap: 18px; }
  .contact-details dt { display: block; width: auto; margin-bottom: 2px; }
  .contact-form { padding: 24px; }
  .chain__row { grid-template-columns: 44px 1fr; gap: 14px; }
}

@media (max-width: 480px) {
  .brand { font-size: 20px; }
  .site-footer__brand { font-size: 28px; }
  .hero__claim { font-size: 18px; }
  .hero__actions .btn { flex: 1 1 100%; }
}

/* Print: drop the sticky chrome and the moving bands. */
@media print {
  .site-header, .marquee, .nav-toggle, .contact-form { display: none; }
  .band--dark { background: none; color: #000; --ink: #000; }
}