/* ============================================================
   Event Revenue Engine™ — assets/css/ere.css
   Design system shared with the APTA build (Institutional
   Editorial Prestige). Tokens carried over verbatim from
   apta-home-build-notes.md, including the validated accessible
   gold derivatives (see that doc, "The accessible gold token").
   ============================================================ */

/* ---------- 1. Foundations — tokens ---------- */

:root {
  /* Brand colour — approved palette */
  --navy: #071A2C;           /* Midnight Navy */
  --navy-muted: #0C2942;     /* Muted Navy */
  --ivory: #F4EFE5;          /* Warm Ivory */
  --gold: #B29357;           /* Brushed Gold — rules, nodes, borders, filled buttons. AA on navy (6.04:1). AA FAIL on ivory (2.54:1) — never used for text on ivory. */
  --gold-light: #D8BC85;     /* Derived: gold text on dark fields. 9.60:1 on navy. */
  --gold-deep: #6E5626;      /* Derived: gold text on ivory fields. 6.06:1 on ivory. */
  --slate: #B8C4CE;          /* secondary text on navy, 9.91:1 */
  --muted-ink: #3C4C5A;      /* secondary text on ivory, 7.72:1 */
  --ink-on-navy: #F4EFE5;
  --ink-on-ivory: #14212C;
  --hairline-navy: rgba(244, 239, 229, 0.16);
  --hairline-ivory: rgba(7, 26, 44, 0.14);
  --overlay-navy-soft: rgba(7, 26, 44, 0.04);

  /* Type */
  --font-display: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Spacing scale */
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4rem;
  --space-8: 6rem;
  --space-9: 8rem;

  /* Layout */
  --container-max: 1200px;
  --measure: 62ch;
  --radius-sm: 2px;
  --radius-md: 4px;
  --header-height: 84px;

  /* Motion */
  --ease-editorial: cubic-bezier(0.4, 0, 0.2, 1);
  --dur-fast: 160ms;
  --dur-med: 420ms;
  --dur-slow: 900ms;
}

@media (prefers-reduced-motion: reduce) {
  :root { --dur-fast: 0ms; --dur-med: 0ms; --dur-slow: 0ms; }
}

/* ---------- 2. Reset ---------- */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--ivory);
  color: var(--ink-on-ivory);
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
}

img, svg { max-width: 100%; display: block; }
ul, ol { padding: 0; margin: 0; }
li { list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
input, textarea, select { font: inherit; }
h1, h2, h3, h4, h5, h6 { margin: 0; font-weight: 400; }
p { margin: 0; }

/* ---------- 3. Accessibility utilities ---------- */

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -100px;
  background: var(--gold);
  color: var(--navy);
  padding: var(--space-2) var(--space-3);
  font-weight: 600;
  border-radius: var(--radius-sm);
  z-index: 1000;
  transition: top var(--dur-fast) var(--ease-editorial);
}
.skip-link:focus { top: var(--space-3); }

:focus-visible {
  outline: 2px solid var(--gold-deep);
  outline-offset: 3px;
}
.on-navy :focus-visible,
.section--navy :focus-visible,
.section--muted-navy :focus-visible {
  outline-color: var(--gold-light);
}

/* ---------- 4. Layout ---------- */

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-5);
}

.section { padding: var(--space-8) 0; }
.section--tight { padding: var(--space-7) 0; }

.section--navy { background: var(--navy); color: var(--ink-on-navy); }
.section--muted-navy { background: var(--navy-muted); color: var(--ink-on-navy); }
.section--ivory { background: var(--ivory); color: var(--ink-on-ivory); }

.eyebrow {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold-deep);
  margin: 0 0 var(--space-3);
}
.section--navy .eyebrow,
.section--muted-navy .eyebrow { color: var(--gold-light); }

.section-head { max-width: 46rem; margin-bottom: var(--space-6); }

h1, .h1 {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 1.7rem + 2.4vw, 3.75rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
}
h2, .h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 1.5rem + 1.4vw, 2.75rem);
  line-height: 1.14;
}
h3, .h3 {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 1.15rem + 0.6vw, 1.65rem);
  line-height: 1.25;
}
.lede {
  font-size: clamp(1.05rem, 1rem + 0.3vw, 1.2rem);
  max-width: var(--measure);
  color: var(--muted-ink);
  margin-top: var(--space-4);
}
.section--navy .lede,
.section--muted-navy .lede { color: var(--slate); }

.rule-gold {
  border: 0;
  height: 1px;
  background: var(--gold);
  width: 64px;
  margin: var(--space-4) 0;
}
.rule-gold--full { width: 100%; opacity: 0.5; }

/* ---------- 5. Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 52px;
  padding: 0 var(--space-5);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: background var(--dur-fast) var(--ease-editorial),
              color var(--dur-fast) var(--ease-editorial),
              border-color var(--dur-fast) var(--ease-editorial);
  white-space: nowrap;
}

.btn--primary {
  background: var(--gold);
  color: var(--navy);
}
.btn--primary:hover { background: var(--gold-light); }

.btn--secondary {
  background: transparent;
  border-color: currentColor;
  color: inherit;
}
.section--ivory .btn--secondary { border-color: var(--navy); color: var(--navy); }
.btn--secondary:hover { background: var(--overlay-navy-soft); }
.section--navy .btn--secondary:hover,
.section--muted-navy .btn--secondary:hover { background: rgba(244,239,229,0.08); }

.btn--full { width: 100%; }

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

/* ---------- 6. Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--navy);
  border-bottom: 1px solid var(--hairline-navy);
  height: var(--header-height);
}
.site-header__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-4);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  color: var(--ink-on-navy);
}
.brand__mark {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--gold-light);
}
.brand__sub {
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate);
  margin-top: 2px;
}
.brand__apta {
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--slate);
  opacity: 0.7;
  margin-top: var(--space-1);
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.primary-nav__list {
  display: flex;
  gap: var(--space-5);
}
.primary-nav__list a {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--slate);
  padding: var(--space-1) 0;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-fast) var(--ease-editorial), border-color var(--dur-fast) var(--ease-editorial);
}
.primary-nav__list a:hover,
.primary-nav__list a:focus-visible { color: var(--ink-on-navy); border-color: var(--gold); }

.header-cta { display: flex; align-items: center; gap: var(--space-3); }
.header-cta .btn { min-height: 44px; padding: 0 var(--space-4); font-size: 0.85rem; }

.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--hairline-navy);
  color: var(--ink-on-navy);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  min-height: 44px;
  min-width: 44px;
}

.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--navy);
  z-index: 200;
  padding: var(--space-5) var(--space-4);
  flex-direction: column;
  overflow-y: auto;
}
.mobile-nav[data-open="true"] { display: flex; }
.mobile-nav__top { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--space-6); }
.mobile-nav__list { display: flex; flex-direction: column; gap: var(--space-5); margin-bottom: var(--space-6); }
.mobile-nav__list a { font-family: var(--font-display); font-size: 1.5rem; color: var(--ink-on-navy); }
.mobile-nav__close {
  background: transparent; border: 1px solid var(--hairline-navy);
  color: var(--ink-on-navy); min-height: 44px; min-width: 44px; border-radius: var(--radius-sm);
}

/* ---------- 7. Hero ---------- */

.hero {
  min-height: 760px;
  display: flex;
  align-items: center;
  padding: var(--space-8) 0;
}
.hero__grid { align-items: center; }
.hero__copy { grid-column: span 6; }
.hero__graphic { grid-column: span 6; display: flex; justify-content: center; }
.hero__headline { margin-bottom: var(--space-4); }
.hero__support { color: var(--slate); max-width: 46ch; font-size: 1.1rem; }
.hero__strapline {
  margin-top: var(--space-7);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold-light);
  padding-top: var(--space-4);
  border-top: 1px solid var(--hairline-navy);
}

/* ---------- 8. Commercial Problem (editorial split) ---------- */

.problem__grid { align-items: start; }
.problem__statement { grid-column: span 6; }
.problem__body { grid-column: span 6; }
.problem__body p + p { margin-top: var(--space-3); }
.problem__highlight {
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid var(--hairline-ivory);
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--navy);
}

.chain {
  margin-top: var(--space-7);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  padding-top: var(--space-6);
  border-top: 1px solid var(--hairline-ivory);
}
.chain__node {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--navy);
  padding: var(--space-1) var(--space-2);
  border: 1px solid var(--gold);
  border-radius: 999px;
}
.chain__arrow { color: var(--gold-deep); font-size: 0.9rem; }

/* ---------- 9. How ERE Works — editorial rows ---------- */

.stage-list { margin-top: var(--space-6); }
.stage-row {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: var(--space-5);
  padding: var(--space-6) 0;
  border-top: 1px solid var(--hairline-navy);
}
.stage-row:last-child { border-bottom: 1px solid var(--hairline-navy); }
.stage-row__num {
  font-family: var(--font-display);
  font-size: 2.25rem;
  color: var(--gold);
  line-height: 1;
}
.stage-row__label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold-light);
  margin-bottom: var(--space-2);
}
.stage-row__title { margin-bottom: var(--space-2); }
.stage-row__body { color: var(--slate); max-width: 56ch; }
.stage-row__output {
  display: inline-block;
  margin-top: var(--space-3);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--ink-on-navy);
  padding: var(--space-1) var(--space-2);
  border: 1px solid var(--gold);
  border-radius: var(--radius-sm);
}

.loop-back {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-5);
  color: var(--gold-light);
  font-size: 0.85rem;
  font-weight: 600;
}
.loop-back__line { flex: 1; height: 1px; background: var(--gold); opacity: 0.5; }

/* ---------- 10. Three Operating Layers ---------- */

.layers-grid { align-items: start; }
.layer-col {
  grid-column: span 4;
  padding: 0 var(--space-5);
  border-left: 1px solid var(--gold);
}
.layer-col:first-child { padding-left: 0; border-left: 0; }
.layer-col__kicker {
  font-size: 0.72rem; font-weight: 600; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--gold-deep); margin-top: var(--space-3);
}
.layer-col__path {
  margin-top: var(--space-4);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--navy);
  line-height: 1.7;
}
.layer-col__body { margin-top: var(--space-3); color: var(--muted-ink); }

/* ---------- 11. What ERE Improves ---------- */

.improve-grid { align-items: start; }
.improve-area {
  grid-column: span 6;
  padding: var(--space-5) 0;
  border-top: 1px solid var(--hairline-navy);
}
.improve-area__title { margin-bottom: var(--space-3); }
.improve-area__body { color: var(--slate); max-width: 52ch; }

/* ---------- 12. Beyond Consulting ---------- */

.statement-block { max-width: 50rem; }
.statement-block__primary { margin-bottom: var(--space-4); }
.statement-block__secondary {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--navy);
  margin-bottom: var(--space-6);
}
.statement-block__secondary strong { color: var(--gold-deep); font-weight: 600; }
.statement-block__sub { margin-top: var(--space-7); margin-bottom: var(--space-3); }
.statement-block__body p + p { margin-top: var(--space-3); }
.statement-block__body { color: var(--muted-ink); max-width: var(--measure); }

/* ---------- 13. Services / Value ladder ---------- */

.ladder { margin-top: var(--space-6); }
.ladder-row {
  display: grid;
  grid-template-columns: 110px 1fr auto;
  gap: var(--space-5);
  align-items: center;
  padding: var(--space-5) 0;
  border-top: 1px solid var(--hairline-ivory);
}
.ladder-row:last-child { border-bottom: 1px solid var(--hairline-ivory); }
.ladder-row__level {
  font-family: var(--font-display);
  color: var(--gold-deep);
  font-size: 1.1rem;
}
.ladder-row__title { margin-bottom: var(--space-2); }
.ladder-row__body { color: var(--muted-ink); max-width: 52ch; }
.ladder-row__badge {
  justify-self: end;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold-deep);
  border: 1px solid var(--gold);
  border-radius: 999px;
  padding: var(--space-1) var(--space-3);
  white-space: nowrap;
}

/* ---------- 14. Who ERE Is For ---------- */

.suitability-list {
  margin-top: var(--space-5);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3) var(--space-6);
}
.suitability-list li {
  padding: var(--space-3) 0;
  border-top: 1px solid var(--hairline-navy);
  color: var(--slate);
  font-size: 0.95rem;
}

/* ---------- 15. Opportunity Review + Contact ---------- */

.review-grid { align-items: start; }
.review__copy { grid-column: span 5; position: sticky; top: calc(var(--header-height) + var(--space-5)); }
.review__form-wrap { grid-column: span 7; }
.review__highlight {
  margin-top: var(--space-5);
  padding: var(--space-4);
  border-left: 2px solid var(--gold);
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--navy);
  background: rgba(178, 147, 87, 0.06);
}

.content-card {
  background: #fff;
  border: 1px solid var(--hairline-ivory);
  border-radius: var(--radius-md);
  padding: var(--space-6);
}
.content-card h3 { margin-top: var(--space-2); margin-bottom: var(--space-4); }
.content-card__body { color: var(--muted-ink); margin-bottom: var(--space-4); max-width: 46ch; }
.content-card .btn--full { margin-top: var(--space-2); }
.content-card__hint {
  margin-top: var(--space-3);
  font-size: 0.85rem;
  color: var(--muted-ink);
  text-align: center;
}

/* ---------- 16. Revenue Engine Loop SVG ---------- */

.loop-graphic { width: 100%; max-width: 440px; }
.loop-graphic .loop-path {
  fill: none;
  stroke: var(--gold);
  stroke-width: 1;
  opacity: 0.55;
}
.loop-graphic .loop-node circle { fill: var(--navy); stroke: var(--gold); stroke-width: 1.5; }
.loop-graphic .loop-node text { fill: var(--gold-light); font-family: var(--font-body); font-size: 8px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; }
.loop-graphic .loop-center-title { fill: var(--ink-on-navy); font-family: var(--font-display); font-size: 15px; }
.loop-graphic .loop-center-sub { fill: var(--slate); font-family: var(--font-body); font-size: 7px; letter-spacing: 0.08em; text-transform: uppercase; }

.loop-graphic[data-animate="true"] .loop-path {
  stroke-dasharray: 900;
  stroke-dashoffset: 900;
  animation: draw-loop var(--dur-slow) var(--ease-editorial) forwards;
  animation-duration: 1600ms;
}
@keyframes draw-loop { to { stroke-dashoffset: 0; } }
@media (prefers-reduced-motion: reduce) {
  .loop-graphic[data-animate="true"] .loop-path { animation: none; stroke-dashoffset: 0; }
}

/* Chain sequence graphic (Commercial Problem section) icon-free, type-only — styled above via .chain */

/* ---------- 17. Reveal-on-scroll ---------- */

[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--dur-med) var(--ease-editorial), transform var(--dur-med) var(--ease-editorial);
}
[data-reveal="true"] { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
}

/* ---------- 18. Footer ---------- */

.site-footer { background: var(--navy); color: var(--slate); padding: var(--space-7) 0 var(--space-6); }
.footer__grid { display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--space-6); margin-bottom: var(--space-6); }
.footer__brand { max-width: 26rem; }
.footer__mark { font-family: var(--font-display); font-size: 1.4rem; color: var(--gold-light); margin-bottom: var(--space-2); }
.footer__tagline { font-size: 0.9rem; margin-bottom: var(--space-1); }
.footer__parent { font-size: 0.82rem; opacity: 0.8; }
.footer__nav { display: flex; flex-wrap: wrap; gap: var(--space-6); }
.footer__nav-col { display: flex; flex-direction: column; gap: var(--space-2); }
.footer__nav-col a { font-size: 0.88rem; color: var(--slate); }
.footer__nav-col a:hover, .footer__nav-col a:focus-visible { color: var(--ink-on-navy); }
.footer__legal { border-top: 1px solid var(--hairline-navy); padding-top: var(--space-5); font-size: 0.78rem; opacity: 0.75; }
.footer__legal p + p { margin-top: var(--space-1); }

/* ---------- 19. Responsive ---------- */

@media (max-width: 1024px) {
  .primary-nav__list { gap: var(--space-4); }
  .review__copy { grid-column: span 5; }
  .review__form-wrap { grid-column: span 7; }
}

@media (max-width: 900px) {
  .primary-nav__list { display: none; }
  .menu-toggle { display: inline-flex; align-items: center; justify-content: center; }

  .hero__grid, .problem__grid, .layers-grid, .improve-grid, .review-grid { display: block; }
  .hero__copy, .hero__graphic, .problem__statement, .problem__body,
  .layer-col, .improve-area, .review__copy, .review__form-wrap { grid-column: auto; }

  .hero { min-height: 0; display: block; }
  .hero__grid { width: 100%; min-width: 0; }
  .hero__copy { margin-bottom: var(--space-6); min-width: 0; }
  .hero__graphic { justify-content: center; }

  .problem__body { margin-top: var(--space-5); }

  .layers-grid { display: flex; flex-direction: column; }
  .layer-col { border-left: 0; border-top: 1px solid var(--gold); padding: var(--space-5) 0 0; }
  .layer-col:first-child { border-top: 0; padding-top: 0; }

  .improve-area { border-top: 1px solid var(--hairline-navy); }

  .review__copy { position: static; margin-bottom: var(--space-6); }

  .ladder-row { grid-template-columns: 1fr; text-align: left; }
  .ladder-row__badge { justify-self: start; margin-top: var(--space-2); }
  .ladder-row__level { margin-bottom: var(--space-1); }

  .stage-row { grid-template-columns: 60px 1fr; gap: var(--space-4); }

  .suitability-list { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .header-cta .btn--primary { display: none; }
  .mobile-nav__list a[data-mobile-cta] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 52px;
    padding: 0 var(--space-5);
    background: var(--gold);
    color: var(--navy);
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
  }
}

@media (max-width: 480px) {
  :root { --header-height: 72px; }
  .brand__mark { font-size: 1.25rem; }
  .brand__apta { display: none; }
  .site-header__inner { gap: var(--space-2); }
  .section { padding: var(--space-7) 0; }
  .cta-row { flex-direction: column; align-items: stretch; }
  .cta-row .btn { width: 100%; }
  .content-card { padding: var(--space-4); }
}