/* ============================================================
   NetVision — Design System (light theme default)
   Editorial Anthropic warmth + Palantir structural discipline.
   No gradients. No glow. No 3D. Whitespace is composition.
   ============================================================ */

:root {
  /* Base */
  --bg:            #FBFAF7;
  --bg-subtle:     #F3F1EB;
  --bg-dark:       #11131A;

  /* Text */
  --text:          #202E55;
  --text-muted:    #8192AB;
  --text-on-dark:  #F2F0EA;
  --text-on-dark-muted: #9A968D;

  /* Accent — placeholder royal blue, to be replaced by brand hex */
  --accent:        #0D77E1;
  --accent-hover:  #16306E;
  --accent-soft:   #E8EDF7;

  /* Lines */
  --border:        #E4E1D8;
  --border-strong: #CFCBC0;
  --border-on-dark: #2A2D38;
  --divider:       #DEE4F3;

  /* System */
  --radius:        16px;
  --radius-lg:     16px;

  /* Buttons (matched to core-app) */
  --btn-radius:    16px;
  --btn-radius-sm: 16px;
  --btn-secondary-bg:       #F3F5FB;
  --btn-secondary-bg-hover: #E5E9EF;

  /* Type scale (desktop) */
  --fs-h1:    64px;
  --fs-h2:    40px;
  --fs-h3:    26px;
  --fs-card:  20px;
  --fs-bodyL: 19px;
  --fs-body:  17px;
  --fs-small: 15px;
  --fs-eyebrow: 13px;
  --fs-metric: 56px;
  --fs-layer:  14px;

  /* Layout */
  --container: 1200px;
  --prose: 720px;
  --space-section-desktop: 80px;
  --space-section-mobile: 56px;
}

/* Reset & base ---------------------------------------------- */

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: var(--fs-body);
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img, svg { display: block; max-width: 100%; }

a {
  color: inherit;
  text-decoration: none;
  transition: color 150ms ease;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Typography roles ------------------------------------------ */

h1, h2, h3, .serif {
  font-family: 'Newsreader', 'Iowan Old Style', 'Georgia', serif;
  font-weight: 450;
  letter-spacing: -0.01em;
}

h1 { font-size: var(--fs-h1); line-height: 1.05; margin: 0; }
h2 { font-size: var(--fs-h2); line-height: 1.10; margin: 0; }
h3 { font-size: var(--fs-h3); line-height: 1.20; margin: 0; }

.card-title {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: var(--fs-card);
  font-weight: 600;
  line-height: 1.30;
  margin: 0;
  letter-spacing: -0.005em;
}

.body-large { font-size: var(--fs-bodyL); line-height: 1.6; }
.small      { font-size: var(--fs-small); line-height: 1.5; }
.muted      { color: var(--text-muted); }

.mono,
code,
kbd,
samp {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-feature-settings: "ss01", "cv01";
}

.eyebrow {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: var(--fs-eyebrow);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  display: inline-block;
  margin-bottom: 24px;
}

.metric {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: var(--fs-metric);
  font-weight: 500;
  line-height: 1.0;
  color: var(--text);
  letter-spacing: -0.02em;
}

.layer-code {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: var(--fs-layer);
  color: #8192AB;
  font-weight: 500;
  letter-spacing: 0.04em;
}

/* Prose constraints ----------------------------------------- */

.prose {
  max-width: var(--prose);
  color: var(--text);
}

.prose p { margin: 0 0 16px; }
.prose p:last-child { margin-bottom: 0; }

/* Layout primitives ----------------------------------------- */

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding-left: 48px;
  padding-right: 48px;
}

.section {
  padding-top: var(--space-section-desktop);
  padding-bottom: var(--space-section-desktop);
}

.section--subtle { background: var(--bg-subtle); }
.section--dark   { background: var(--bg-dark); color: var(--text-on-dark); }
.section--dark .muted { color: var(--text-on-dark-muted); }
.section--dark .eyebrow { color: var(--text-on-dark); }

.section-divider {
  border: 0;
  border-top: 1px solid var(--divider);
  margin: 0;
}

/* Section heading patterns */

.section-heading {
  max-width: 880px;
  margin-bottom: 48px;
}
.section-heading h2 { margin-bottom: 16px; }
.section-heading .lead { color: var(--text-muted); font-size: var(--fs-bodyL); max-width: 720px; }

/* Buttons --------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 16px;
  font-weight: 500;
  border-radius: var(--btn-radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 150ms ease, color 150ms ease, border-color 150ms ease, opacity 150ms ease;
  text-decoration: none;
  line-height: 1;
}
.btn:disabled,
.btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn--primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn--primary:hover { opacity: 0.9; }

.btn--ghost {
  background: var(--btn-secondary-bg);
  color: var(--text);
  border-color: var(--btn-secondary-bg);
}
.btn--ghost:hover { background: var(--btn-secondary-bg-hover); border-color: var(--btn-secondary-bg-hover); }

.btn--on-dark {
  background: rgba(255,255,255,0.08);
  color: var(--text-on-dark);
  border-color: rgba(255,255,255,0.24);
}
.btn--on-dark:hover { background: rgba(255,255,255,0.16); }

.btn .arrow { transition: transform 150ms ease; }
.btn:hover .arrow { transform: translateX(2px); }

/* Inline arrow link */
.arrow-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
  color: var(--accent);
  font-size: var(--fs-body);
}
.arrow-link:hover { color: var(--accent-hover); }
.arrow-link .arrow { transition: transform 150ms ease; }
.arrow-link:hover .arrow { transform: translateX(2px); }

/* Card ------------------------------------------------------ */

.card {
  background: #FFFFFF;
  border: 1px solid #DEE4F3;
  border-radius: var(--radius);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  height: 100%;
}
.section--subtle .card { background: #FFFFFF; }

.card__title { font-family: Roboto, 'Helvetica Neue', sans-serif; font-size: var(--fs-card); font-weight: 600; line-height: 1.3; margin: 0; }
.card__desc  { color: var(--text-muted); font-size: var(--fs-body); margin: 0; }
.card__link  { margin-top: auto; padding-top: 8px; }

/* Grids ----------------------------------------------------- */

.grid {
  display: grid;
  gap: 24px;
}
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }

/* Header ---------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: #FFFFFF;
  border-bottom: 1px solid var(--divider);
}

.site-header__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  min-height: 72px;
}
.brand {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-weight: 500;
  font-size: 22px;
  color: var(--text);
  letter-spacing: -0.01em;
}
.brand__logo {
  height: 28px;
  width: auto;
  display: block;
}

.nav-main {
  display: flex;
  gap: 28px;
  align-items: center;
  justify-self: center;
}
.nav-main > a {
  font-size: var(--fs-small);
  color: var(--text);
  font-weight: 450;
  position: relative;
  padding: 8px 0;
  display: inline-flex;
  align-items: center;
  line-height: 1.25;
  text-decoration: none;
}
.nav-main > a:hover { color: var(--accent); }
.nav-main > a.is-active { color: var(--accent); }
.nav-main > .has-dropdown {
  position: relative;
  cursor: default;
  font-size: var(--fs-small);
  color: var(--text);
  font-weight: 450;
  padding: 8px 0;
  display: inline-flex;
  align-items: center;
  line-height: 1.25;
  gap: 6px;
}
.nav-main > .has-dropdown:hover,
.nav-main > .has-dropdown:focus-within {
  color: var(--accent);
}
.nav-main > .has-dropdown::after {
  content: '';
  display: block;
  width: 6px;
  height: 6px;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  transform: rotate(45deg);
  margin-top: -3px;
  flex-shrink: 0;
}

.dropdown {
  position: absolute;
  top: 100%;
  left: -16px;
  min-width: 240px;
  background: var(--bg);
  border: 1px solid #DEE4F3;
  border-radius: var(--radius);
  padding: 12px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity 150ms ease, transform 150ms ease, visibility 150ms;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.has-dropdown:hover .dropdown,
.has-dropdown:focus-within .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.dropdown a {
  padding: 10px 12px;
  border-radius: var(--radius);
  font-size: var(--fs-small);
}
.dropdown a:hover { background: var(--bg-subtle); color: var(--accent); }
.dropdown .dropdown__hint {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: 12px 12px 6px;
}

.nav-utility {
  display: flex;
  align-items: center;
  gap: 0;
  justify-self: end;
}

.btn--sm { padding: 10px 18px; font-size: var(--fs-small); border-radius: var(--btn-radius-sm); }

/* Mobile nav */
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  padding: 0;
  cursor: pointer;
}
.nav-toggle svg { width: 18px; height: 18px; stroke: var(--text); }

/* Hero ------------------------------------------------------ */

.hero {
  padding-top: 60px;
  padding-bottom: 72px;
}
.hero__eyebrow { color: var(--accent); }
.hero h1 { max-width: 1000px; margin-bottom: 24px; }
.hero__sub {
  font-size: var(--fs-bodyL);
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 0 40px;
  line-height: 1.55;
}
.hero__ctas {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* Value chain diagram --------------------------------------- */

.value-chain {
  margin-top: 24px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.value-chain__row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  align-items: stretch;
}
.value-chain__step {
  padding: 40px 28px;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: relative;
}
.value-chain__step:last-child { border-right: 0; }
.value-chain__num {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.06em;
}
.value-chain__title {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-weight: 600;
  font-size: var(--fs-card);
  letter-spacing: -0.005em;
}
.value-chain__desc {
  font-size: var(--fs-small);
  color: var(--text-muted);
  line-height: 1.55;
}
.value-chain__connector {
  position: absolute;
  right: -12px;
  top: 50%;
  transform: translateY(-50%);
  width: 24px;
  height: 24px;
  background: url('arrow.svg') center / contain no-repeat;
  z-index: 1;
}

/* Metric block ---------------------------------------------- */

.metrics-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.metric-cell {
  padding: 48px 32px;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.metric-cell:last-child { border-right: 0; }
.metric-cell .metric { font-size: var(--fs-metric); }
.metric-cell .metric-label {
  font-size: var(--fs-body);
  color: var(--text-muted);
  max-width: 280px;
  line-height: 1.5;
}
.metric-cell .metric-source {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  margin-top: auto;
  padding-top: 12px;
  text-transform: uppercase;
}

/* Architecture preview (Homepage L1-L5) --------------------- */

.stack-list {
  border-top: 1px solid var(--border);
}
.stack-row {
  display: grid;
  grid-template-columns: 120px 240px 1fr;
  gap: 32px;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
  align-items: baseline;
}
.stack-row__code { font-family: Roboto, 'Helvetica Neue', sans-serif; color: var(--accent); font-size: var(--fs-layer); letter-spacing: 0.06em; }
.stack-row__name { font-family: Roboto, 'Helvetica Neue', sans-serif; font-weight: 600; font-size: var(--fs-card); }
.stack-row__desc { color: var(--text-muted); font-size: var(--fs-body); line-height: 1.55; }

/* QoS specific: measurement surfaces, methodology blocks ---- */

.surface-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.surface-cell {
  padding: 36px 28px;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.surface-cell:last-child { border-right: 0; }
.surface-cell h4 {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: var(--fs-card);
  font-weight: 600;
  margin: 0;
}
.surface-cell .surface-apps {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.surface-cell .surface-desc {
  font-size: var(--fs-small);
  color: var(--text-muted);
  line-height: 1.55;
}

/* Methodology two-column */
.method-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
.method-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}
.method-card .std-code {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.06em;
  margin-bottom: 12px;
}
.method-card h4 {
  font-family: 'Newsreader', serif;
  font-weight: 450;
  font-size: 22px;
  margin: 0 0 8px;
  line-height: 1.25;
}
.method-card p { color: var(--text-muted); margin: 0; font-size: var(--fs-body); }

/* Loss scale table */
.scale-table {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.scale-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  gap: 32px;
  align-items: baseline;
}
.scale-row:last-child { border-bottom: 0; }
.scale-row__value {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 16px;
  color: var(--accent);
  letter-spacing: 0.04em;
}
.scale-row__desc { color: var(--text); font-size: var(--fs-body); }
.scale-row--critical .scale-row__value { color: var(--text); }

/* Pain threshold table */
.pain-table {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.pain-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  padding: 22px 28px;
  border-bottom: 1px solid var(--border);
  align-items: center;
  gap: 24px;
}
.pain-row:last-child { border-bottom: 0; }
.pain-row__label { font-family: Roboto, 'Helvetica Neue', sans-serif; font-size: var(--fs-body); }
.pain-row__value { font-family: Roboto, 'Helvetica Neue', sans-serif; font-size: 18px; color: var(--accent); text-align: right; letter-spacing: 0.02em; }

/* Pain formula block */
.formula-block {
  background: var(--bg-dark);
  color: var(--text-on-dark);
  padding: 56px 48px;
  border-radius: var(--radius);
  text-align: center;
}
.formula-block__label {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 13px;
  color: var(--text-on-dark-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 24px;
}
.formula-block__expr {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 28px;
  letter-spacing: 0.02em;
  line-height: 1.4;
}
.formula-block__expr .op,
.formula-block__expr .num { color: var(--text-on-dark-muted); }

/* Insight cards */
.insights-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.insight {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.section--subtle .insight { background: var(--bg-subtle); }
.insight__num {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.06em;
}
.insight h4 {
  font-family: 'Newsreader', serif;
  font-weight: 450;
  font-size: 22px;
  line-height: 1.25;
  margin: 0;
}
.insight p { color: var(--text-muted); margin: 0; font-size: var(--fs-body); line-height: 1.6; }

/* Integration bullets */
.integration-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.integration-list li {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 12px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  font-size: var(--fs-bodyL);
}
.integration-list li:last-child { border-bottom: 0; }
.integration-list li::before {
  content: counter(int);
  counter-increment: int;
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.06em;
}
.integration-list { counter-reset: int; }

/* Closing CTA section --------------------------------------- */

.closing-cta {
  padding: 72px 0;
  text-align: left;
}
.closing-cta__inner {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 48px;
  flex-wrap: wrap;
}
.closing-cta h2 { max-width: 720px; }

/* Footer ---------------------------------------------------- */

.site-footer {
  background: #202E55;
  color: var(--text-on-dark);
  padding: 96px 0 48px;
}
.site-footer a { color: var(--text-on-dark); }
.site-footer a:hover { color: #fff; }

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 64px;
}
.footer-brand .brand { color: var(--text-on-dark); }
.footer-brand .footer-tag {
  margin-top: 16px;
  font-size: var(--fs-small);
  color: #8192AB;
  max-width: 320px;
  line-height: 1.55;
}
.footer-col h5 {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #8192AB;
  margin: 0 0 16px;
  font-weight: 500;
}
.footer-col ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.footer-col a { font-size: var(--fs-small); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 32px;
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 12px;
  color: #8192AB;
  letter-spacing: 0.04em;
}
.footer-bottom .footer-social { display: flex; gap: 20px; }

/* Scroll reveal --------------------------------------------- */

/* Reveal items start hidden ONLY if JS is enabled — otherwise visible by default */
html.has-js .reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 500ms ease-out, transform 500ms ease-out;
}
html.has-js .reveal.is-in { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

/* Responsive ------------------------------------------------ */

@media (max-width: 1024px) {
  :root {
    --fs-h1: 48px;
    --fs-h2: 34px;
    --fs-h3: 24px;
    --fs-metric: 48px;
  }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .value-chain__row { grid-template-columns: repeat(2, 1fr); }
  .value-chain__step { border-right: 0; border-bottom: 1px solid var(--border); }
  .value-chain__step:nth-child(odd) { border-right: 1px solid var(--border); }
  .value-chain__step:last-child { border-bottom: 0; }
  .value-chain__connector { display: none; }
  .surface-grid { grid-template-columns: repeat(2, 1fr); }
  .surface-cell:nth-child(2) { border-right: 0; }
  .surface-cell:nth-child(odd) { border-right: 1px solid var(--border); }
  .surface-cell:nth-child(1), .surface-cell:nth-child(2) { border-bottom: 1px solid var(--border); }
  .insights-grid { grid-template-columns: 1fr; }
  .metrics-row { grid-template-columns: 1fr; }
  .metric-cell { border-right: 0; border-bottom: 1px solid var(--border); }
  .metric-cell:last-child { border-bottom: 0; }
  .footer-top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  :root {
    --fs-h1: 42px;
    --fs-h2: 30px;
    --fs-bodyL: 17px;
    --fs-metric: 42px;
  }
  .container { padding-left: 24px; padding-right: 24px; }
  .section { padding-top: var(--space-section-mobile); padding-bottom: var(--space-section-mobile); }
  .hero { padding-top: 56px; padding-bottom: 56px; }
  .site-header__inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 72px;
    height: auto;
    gap: 16px;
  }
  .nav-main, .nav-utility .btn { display: none; }
  .nav-toggle { display: inline-flex; }
  .grid--4, .grid--3, .grid--2 { grid-template-columns: 1fr; }
  .value-chain__row { grid-template-columns: 1fr; }
  .value-chain__step { border-right: 0 !important; border-bottom: 1px solid var(--border); }
  .surface-grid { grid-template-columns: 1fr; }
  .surface-cell { border-right: 0; border-bottom: 1px solid var(--border); }
  .surface-cell:last-child { border-bottom: 0; }
  .stack-row { grid-template-columns: 1fr; gap: 6px; padding: 24px 0; }
  .method-grid { grid-template-columns: 1fr; }
  .pain-row, .scale-row { grid-template-columns: 1fr; gap: 6px; }
  .pain-row__value, .scale-row__value { text-align: left; }
  .formula-block { padding: 40px 24px; }
  .formula-block__expr { font-size: 19px; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
  .closing-cta__inner { flex-direction: column; align-items: flex-start; }
}

/* Mobile nav drawer ----------------------------------------- */

.mobile-nav {
  position: fixed;
  inset: 0;
  background: #FFFFFF;
  z-index: 60;
  padding: 24px;
  display: none;
  flex-direction: column;
  gap: 24px;
  overflow-y: auto;
}
.mobile-nav.is-open { display: flex; }
.mobile-nav__head { display: flex; justify-content: space-between; align-items: center; height: 48px; }
.mobile-nav__close {
  background: transparent;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  width: 40px; height: 40px;
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer;
}
.mobile-nav details { border-bottom: 1px solid var(--border); padding: 16px 0; }
.mobile-nav summary {
  cursor: pointer;
  font-family: 'Newsreader', serif;
  font-size: 28px;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.mobile-nav summary::-webkit-details-marker { display: none; }
.mobile-nav summary::after {
  content: '+';
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 24px;
  color: var(--accent);
}
.mobile-nav details[open] summary::after { content: '−'; }
.mobile-nav details > a,
.mobile-nav .mobile-nav__link {
  display: block;
  font-family: 'Newsreader', serif;
  font-size: 28px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}
.mobile-nav details ul { list-style: none; padding: 16px 0 0; margin: 0; display: flex; flex-direction: column; gap: 12px; }
.mobile-nav details ul a { font-family: Roboto, 'Helvetica Neue', sans-serif; font-size: 17px; color: var(--text-muted); }
.mobile-nav__footer { margin-top: auto; display: flex; flex-direction: column; gap: 16px; padding-top: 32px; }

/* ============================================================
   Intelligence Layer Diagram — federated boundary membrane
   Used on homepage (condensed) and /architecture (full)
   ============================================================ */

.intel-diagram {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 48px 32px;
  position: relative;
  overflow: hidden;
}
.section--subtle .intel-diagram { background: var(--bg); }

.intel-diagram__zones {
  display: flex;
  flex-wrap: nowrap;
  align-items: stretch;
  gap: 0;
  position: relative;
}

.intel-zone {
  flex: 1 1 0;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 0 12px;
}
.intel-zone__label {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 8px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

.intel-node {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.section--subtle .intel-node { background: var(--bg-subtle); }
.intel-node__title {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-weight: 600;
  font-size: 15px;
}
.intel-node__items {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.intel-node__items li {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.45;
}
.intel-node__tag {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 10px;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-top: 6px;
  padding-top: 6px;
  border-top: 1px solid var(--border);
}
.intel-node__vector {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 11px;
  color: var(--text);
  letter-spacing: 0.02em;
  background: var(--bg-subtle);
  padding: 4px 8px;
  border-radius: 16px;
  margin-top: 4px;
  display: inline-block;
}
.section--subtle .intel-node__vector { background: var(--bg); }

/* Connector arrow between zones */
.intel-connector {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 8px;
  color: var(--text-muted);
  position: relative;
}
.intel-connector svg { width: 32px; height: 16px; }

/* The membrane — the most important visual */
.intel-membrane {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0 12px;
  position: relative;
}
.intel-membrane__line {
  width: 2px;
  background: var(--accent);
  flex: 1;
  position: relative;
  background-image: repeating-linear-gradient(
    0deg,
    var(--accent) 0,
    var(--accent) 6px,
    transparent 6px,
    transparent 12px
  );
  background-color: transparent;
  background-size: 2px 12px;
  background-repeat: repeat-y;
  min-height: 280px;
}
.intel-membrane__label {
  position: absolute;
  top: -28px;
  left: 50%;
  transform: translateX(-50%);
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  white-space: nowrap;
  background: var(--bg-subtle);
  padding: 2px 6px;
}
.section--subtle .intel-membrane__label { background: var(--bg); }
.intel-membrane__note {
  position: absolute;
  bottom: -48px;
  left: 50%;
  transform: translateX(-50%);
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 10px;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  white-space: nowrap;
  text-align: center;
  line-height: 1.4;
}

/* Blocked PII tokens — visual proof that personal data stops at the membrane */
.intel-pii-tokens {
  position: absolute;
  right: 100%;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-right: 4px;
  z-index: 2;
}
.intel-pii-token {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  padding: 3px 8px;
  border-radius: 16px;
  position: relative;
  text-decoration: line-through;
  text-decoration-color: var(--accent);
}
.section--subtle .intel-pii-token { background: var(--bg); }
.intel-pii-token::after {
  content: '';
  position: absolute;
  right: -10px;
  top: 50%;
  width: 8px;
  height: 1px;
  background: var(--border-strong);
}

.intel-diagram__annotations {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  line-height: 1.6;
}

/* Condensed variant — for homepage */
.intel-diagram--condensed .intel-node__items { display: none; }
.intel-diagram--condensed .intel-membrane__line { min-height: 140px; }

/* Mobile vertical */
@media (max-width: 900px) {
  .intel-diagram { padding: 32px 16px; }
  .intel-diagram__zones {
    flex-direction: column;
    gap: 16px;
  }
  .intel-zone { flex: none; padding: 0; }
  .intel-connector {
    transform: rotate(90deg);
    padding: 0;
    justify-self: center;
  }
  .intel-membrane {
    flex-direction: row;
    width: 100%;
    padding: 24px 0;
  }
  .intel-membrane__line {
    width: 100%;
    height: 2px;
    min-height: 0;
    background-image: repeating-linear-gradient(
      90deg,
      var(--accent) 0,
      var(--accent) 6px,
      transparent 6px,
      transparent 12px
    );
    background-size: 12px 2px;
    background-repeat: repeat-x;
  }
  .intel-membrane__label {
    top: 0;
    left: 12px;
    transform: none;
  }
  .intel-membrane__note {
    bottom: 0;
    left: 12px;
    transform: none;
    text-align: left;
  }
  .intel-pii-tokens {
    position: static;
    transform: none;
    flex-direction: row;
    justify-content: center;
    padding: 8px 0 0;
    flex-wrap: wrap;
  }
  .intel-pii-token::after { display: none; }
  .intel-diagram__annotations { grid-template-columns: 1fr; gap: 12px; }
}

/* ============================================================
   Federated flow diagram (Compliance page) — 3 blocks
   ============================================================ */
.federated-flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 0;
  align-items: stretch;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px 24px;
}
.section--subtle .federated-flow { background: var(--bg-subtle); }
.fed-block {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-subtle);
}
.section--subtle .fed-block { background: var(--bg); }
.fed-block__num {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.06em;
}
.fed-block__name {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-weight: 600;
  font-size: var(--fs-card);
}
.fed-block__desc {
  font-size: var(--fs-small);
  color: var(--text-muted);
  line-height: 1.6;
}
.fed-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 12px;
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
}
@media (max-width: 900px) {
  .federated-flow { grid-template-columns: 1fr; }
  .fed-arrow { padding: 12px 0; transform: rotate(90deg); }
}

/* ============================================================
   Office cards (Contact page)
   ============================================================ */
.office-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.section--subtle .office-card { background: var(--bg-subtle); }
.office-card__role {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}
.office-card__city {
  font-family: 'Newsreader', serif;
  font-size: 26px;
  font-weight: 450;
}
.office-card__addr,
.office-card__phone {
  font-size: var(--fs-small);
  color: var(--text-muted);
  line-height: 1.6;
}
.office-card__phone {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  letter-spacing: 0.04em;
}

/* ============================================================
   Contact form
   ============================================================ */
.contact-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  max-width: 720px;
}
.contact-form .form-row--full { grid-column: 1 / -1; }
.form-field { display: flex; flex-direction: column; gap: 6px; }
.form-field label {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.form-field input,
.form-field select,
.form-field textarea {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: var(--fs-body);
  padding: 12px 14px;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  color: var(--text);
  transition: border-color 150ms ease;
}
.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  border-color: var(--accent);
  outline: none;
}
.form-field textarea { min-height: 140px; resize: vertical; }
.form-field.is-error input,
.form-field.is-error select,
.form-field.is-error textarea { border-color: #B91C1C; }
.form-error {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 11px;
  color: #B91C1C;
  display: none;
}
.form-field.is-error .form-error { display: block; }
.form-success {
  border: 1px solid var(--accent);
  background: var(--accent-soft);
  padding: 20px 24px;
  border-radius: var(--radius);
  font-size: var(--fs-body);
  display: none;
}
.form-success.is-shown { display: block; }
.form-nda {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  border-top: 1px solid var(--border);
  padding-top: 24px;
  margin-top: 48px;
  max-width: 720px;
}
@media (max-width: 768px) {
  .contact-form { grid-template-columns: 1fr; }
}

/* ============================================================
   Five-layer architecture diagram (Architecture page)
   Vertical stack with audience labels
   ============================================================ */
.layer-stack {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.layer-row {
  display: grid;
  grid-template-columns: 80px 220px 1fr 240px;
  gap: 32px;
  padding: 32px 0;
  border-bottom: 1px solid var(--border);
  align-items: baseline;
}
.layer-row:last-child { border-bottom: 0; }
.layer-row__code {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  color: var(--accent);
  font-size: 16px;
  letter-spacing: 0.06em;
  font-weight: 500;
}
.layer-row__name {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-weight: 450;
  font-size: 22px;
}
.layer-row__desc {
  color: var(--text-muted);
  font-size: var(--fs-body);
  line-height: 1.6;
}
.layer-row__audience {
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  border-left: 2px solid var(--accent);
  padding-left: 16px;
}
@media (max-width: 900px) {
  .layer-row {
    grid-template-columns: 1fr;
    gap: 6px;
    padding: 24px 0;
  }
  .layer-row__audience { padding-left: 12px; margin-top: 8px; }
}


/* ============================================================
   Intelligence Layer — adapted from designer block (used on /architecture)
   Mobile-first; switches to 5-column desktop grid at >= 980px.
   Scoped under .il-; mapped to site tokens (Roboto/Newsreader, accent, #DEE4F3).
   ============================================================ */
.il-root {
  --il-panel:    #F3F5FB;
  --il-ink:      var(--text);
  --il-soft:     var(--text-muted);
  --il-mono:     var(--accent);
  --il-line:     #DEE4F3;
  --il-membrane: var(--text-muted);
  --il-block:    #DD3D48;
  --il-pass:     var(--accent);
  --il-r:        var(--radius);

  background: var(--bg);
  color: var(--il-ink);
  padding: var(--space-section-mobile) 0;
}
.il-root *, .il-root *::before, .il-root *::after { box-sizing: border-box; }
.il-root ul { list-style: none; margin: 0; padding: 0; }
.il-root p  { margin: 0; }

.il-header { margin-bottom: 40px; }
.il-eyebrow {
  display: inline-flex; align-items: center; gap: 14px;
  font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 13px; font-weight: 500; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--il-mono); margin-bottom: 20px;
}
.il-eyebrow__dash { display: inline-block; width: 22px; height: 1px; background: var(--il-mono); }
.il-headline {
  font-family: 'Newsreader', 'Iowan Old Style', 'Georgia', serif;
  font-weight: 450; color: var(--il-ink);
  font-size: clamp(28px, 7vw, 38px); line-height: 1.1;
  letter-spacing: -0.012em; margin: 0 0 18px;
}
.il-sub { font-family: Roboto, 'Helvetica Neue', sans-serif; font-size: 16px; line-height: 1.6; color: var(--il-soft); }

.il-pipeline {
  display: flex; flex-direction: column;
  background: var(--il-panel); border: 1px solid var(--il-line); border-radius: var(--il-r);
}
.il-node { display: flex; flex-direction: column; gap: 12px; padding: 24px 20px; border-bottom: 1px solid var(--il-line); }
.il-node:last-child { border-bottom: 0; }
.il-kicker {
  font-family: Roboto, 'Helvetica Neue', sans-serif; font-size: 12px; font-weight: 500;
  letter-spacing: 0.06em; text-transform: uppercase; color: var(--il-mono); margin: 0;
}
.il-node__title {
  font-family: 'Newsreader', 'Iowan Old Style', 'Georgia', serif;
  font-weight: 450; font-size: 22px; line-height: 1.2; color: var(--il-ink); margin: 0; letter-spacing: -0.005em;
}
.il-list { display: flex; flex-direction: column; }
.il-list li { font-family: Roboto, 'Helvetica Neue', sans-serif; font-size: 14px; line-height: 1.5; color: var(--il-soft); padding: 2px 0; }
.il-tag {
  align-self: flex-start; margin-top: 4px; font-family: Roboto, 'Helvetica Neue', sans-serif;
  font-size: 11px; font-weight: 500; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--il-soft); background: transparent; border: 1px solid var(--il-line); border-radius: var(--il-r); padding: 5px 10px;
}
.il-vec { align-self: flex-start; margin-top: 4px; font-family: Roboto, 'Helvetica Neue', sans-serif; font-size: 13px; letter-spacing: 0.02em; color: var(--il-mono); }

.il-membrane { position: relative; padding: 22px 20px; border-bottom: 1px solid var(--il-line); display: flex; flex-direction: column; gap: 14px; }
.il-membrane__label { font-family: Roboto, 'Helvetica Neue', sans-serif; font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--il-membrane); }
.il-membrane__line { display: block; width: 100%; height: 0; border-top: 1px dashed var(--il-membrane); }
.il-tokens { display: flex; flex-direction: row; flex-wrap: wrap; gap: 18px; align-items: center; }
.il-tok { font-family: Roboto, 'Helvetica Neue', sans-serif; font-size: 12px; display: flex; align-items: center; gap: 4px; line-height: 1.1; white-space: nowrap; }
.il-tok__mark { font-size: 13px; font-weight: 500; line-height: 1; display: inline-block; flex: 0 0 auto; }
.il-tok--blocked { color: var(--il-block); }
.il-tok--pass    { color: var(--il-pass);  }

.il-notes { display: flex; flex-direction: column; gap: 14px; margin-top: 24px; }
.il-notes li { font-family: Roboto, 'Helvetica Neue', sans-serif; font-size: 13px; line-height: 1.6; letter-spacing: 0.01em; color: var(--il-soft); }
.il-notes strong { color: var(--il-ink); font-weight: 500; }

.il-consumers { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 32px; }
.il-consumers li {
  font-family: Roboto, 'Helvetica Neue', sans-serif; font-size: 12px; letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--il-soft); background: transparent; border: 1px solid var(--il-line); border-radius: var(--il-r); padding: 7px 14px;
}

@media (min-width: 980px) {
  .il-root { padding: var(--space-section-desktop) 0; }
  .il-header { max-width: 760px; margin-bottom: 40px; }
  .il-headline { font-size: clamp(32px, 4.2vw, 52px); line-height: 1.08; margin: 0 0 20px; }
  .il-sub { font-size: 17px; max-width: 62ch; }

  .il-pipeline { display: grid; grid-template-columns: 1fr 1fr 72px 1fr 1fr; }
  .il-node { padding: 26px 22px; border-right: 1px solid var(--il-line); border-bottom: 0; min-width: 0; }
  .il-node:last-child { border-right: 0; }
  .il-node__title { font-size: 20px; }
  .il-list li { font-size: 13.5px; }
  .il-tag, .il-vec { margin-top: auto; }

  .il-membrane {
    padding: 18px 0; border-right: 1px solid var(--il-line); border-bottom: 0;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    gap: 14px; overflow: visible;
  }
  /* full-height dashed boundary line, behind the chips */
  .il-membrane__line {
    position: absolute; top: 14px; bottom: 14px; left: 50%;
    transform: translateX(-50%); width: 0; height: auto;
    border-top: 0; border-left: 1px dashed var(--il-membrane); z-index: 0;
  }
  /* vertical BOUNDARY label — readable whole word, fits column width via writing-mode */
  .il-membrane__label {
    position: static; transform: none;
    writing-mode: vertical-rl; text-orientation: mixed;
    white-space: nowrap; font-size: 9px; letter-spacing: 0.14em;
    background: var(--il-panel); padding: 8px 1px; z-index: 1; pointer-events: none;
  }
  /* token chips stacked vertically, sized to content (no overflow into nodes) */
  .il-tokens {
    position: static; transform: none;
    display: flex; flex-direction: column; align-items: center; gap: 8px;
    background: transparent; padding: 0; overflow: visible; z-index: 1;
  }
  .il-tok { font-size: 9px; justify-content: center; background: var(--il-panel); padding: 2px 3px; }
  .il-tok__mark { font-size: 10px; }

  .il-notes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; margin-top: 28px; }
  .il-notes li { max-width: 30ch; }
  .il-consumers { gap: 10px; margin-top: 40px; }
}