/*
  Layout architecture — dossier/case-file system.
  Grid replaces the original builder's nested-div soup entirely.
*/

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--surface-base);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-weight: var(--weight-body);
  line-height: var(--lh-body);
  font-size: var(--text-body);
}

.inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

@media (max-width: 640px) {
  .inner { padding: 0 var(--space-4); }
}

.chapter {
  position: relative;
  padding: var(--space-12) 0;
  border-bottom: 1px solid var(--border-subtle);
  overflow: hidden;
}

.chapter--tight { padding: var(--space-10) 0; }

.chapter--inverse {
  background: var(--surface-inverse);
  color: var(--text-inverse);
  border-bottom-color: rgba(255, 255, 255, 0.14);
}

.chapter--dotgrid {
  background-image: var(--dot-grid-light);
  background-size: var(--dot-grid-size);
}

.chapter--inverse.chapter--dotgrid {
  background-image: var(--dot-grid-dark);
}

/* Giant background numeral — Table D secondary decorative element */
.chapter__num {
  position: absolute;
  top: -0.12em;
  right: -0.02em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 40vw;
  line-height: 1;
  color: var(--text-primary);
  opacity: 0.05;
  z-index: 0;
  pointer-events: none;
  user-select: none;
}

.chapter--inverse .chapter__num { color: var(--text-inverse); opacity: 0.07; }

.chapter__head {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.chapter__kicker {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--brand-accent);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.chapter__kicker::before {
  content: '';
  width: 2.5rem;
  height: 2px;
  background: var(--brand-accent);
}

/* Asymmetric editorial split used by chapters with a lead claim + a
   secondary support column — narrow column beside vast empty space is
   the mandatory unexpected-asymmetry layout moment. */
.split {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 900px) {
  .split { grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); align-items: start; }
  .split--wide-left { grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.9fr); }
  .split--narrow-lead { grid-template-columns: minmax(0, 0.7fr) minmax(0, 1.3fr); }
}

.col-read {
  max-width: var(--column-read);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

/* ---- Hero: Table A — horizontal scroll, then vertical page ---- */
.hero {
  /* Fit under the sticky nav so vertical wheel isn't needed just to see the hero */
  --hero-nav-offset: 4.75rem;
  position: relative;
  background: var(--surface-inverse);
  color: var(--text-inverse);
  height: calc(100svh - var(--hero-nav-offset));
  max-height: calc(100dvh - var(--hero-nav-offset));
}

.hero-scroller {
  display: flex;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
  -ms-overflow-style: none;
  height: 100%;
  min-height: 0;
  -webkit-overflow-scrolling: touch;
}

.hero-scroller::-webkit-scrollbar { display: none; }

.hero-panel {
  flex: 0 0 100%;
  width: 100%;
  min-width: 100%;
  height: 100%;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  display: grid;
  place-items: center;
  padding: var(--space-8) var(--space-6);
  position: relative;
}

.hero-panel__inner {
  max-width: 980px;
  width: 100%;
  position: relative;
  z-index: 1;
}

.hero-progress {
  position: absolute;
  left: 50%;
  bottom: var(--space-6);
  transform: translateX(-50%);
  display: flex;
  gap: var(--space-2);
  z-index: 2;
}

.hero-progress__dot {
  width: 2.25rem;
  height: 2px;
  background: rgba(255, 255, 255, 0.28);
  transition: background var(--dur-med) var(--ease-out);
}

.hero-progress__dot.is-active { background: var(--brand-accent); }

.hero-hint {
  position: absolute;
  right: var(--space-6);
  bottom: var(--space-6);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-inverse-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  z-index: 2;
}

@media (max-width: 720px) {
  .hero { --hero-nav-offset: 4.25rem; }
  .hero-hint { display: none; }
}

/* ---- Split header nav: Table E ---- */
.nav {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-subtle);
}

.nav__row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) 0;
}

.nav__links {
  display: flex;
  gap: var(--space-6);
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
}

.nav__links--left { justify-content: flex-start; }
.nav__links--right { justify-content: flex-end; }

.nav__links a {
  color: var(--text-primary);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
  transition: border-color var(--dur-fast) var(--ease-out);
}

.nav__links a:hover { border-color: var(--brand-accent); }

@media (max-width: 760px) {
  .nav__row {
    grid-template-columns: 1fr;
    justify-content: center;
    text-align: center;
    gap: var(--space-3);
    padding: var(--space-3) 0;
  }
  .nav__links { gap: var(--space-4); flex-wrap: wrap; justify-content: center !important; }
  .nav__links--left { order: 2; }
  .nav__brand { order: 1; }
  .nav__links--right { order: 3; }
}

/* ---- Sticky bottom CTA bar ---- */
.sticky-cta {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: var(--z-sticky-cta);
  background: var(--surface-inverse);
  color: var(--text-inverse);
  border-top: 2px solid var(--brand-accent);
  transform: translateY(100%);
  opacity: 0;
  transition: transform var(--dur-med) var(--ease-in-out), opacity var(--dur-med) var(--ease-in-out);
  pointer-events: none;
}

.sticky-cta.is-visible {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.sticky-cta__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-3) 0;
}

.sticky-cta__copy { font-size: var(--text-sm); }
.sticky-cta__copy strong { color: var(--brand-accent); }

@media (max-width: 640px) {
  .sticky-cta__copy { display: none; }
}

/* ---- Overlapping evidence photo / breakout image ---- */
.breakout {
  position: relative;
  z-index: 1;
  margin: var(--space-10) calc(var(--space-6) * -1);
}

@media (min-width: 900px) {
  .breakout {
    margin-left: calc((100vw - var(--content-max)) / -2 - var(--space-6));
    margin-right: calc((100vw - var(--content-max)) / -2 - var(--space-6));
    max-width: none;
  }
}

.breakout img,
.breakout video {
  width: 100%;
  display: block;
  aspect-ratio: 16 / 8;
  object-fit: cover;
}

.overlap-card {
  position: relative;
  z-index: 2;
  background: var(--surface-base);
  border: 1px solid var(--border-strong);
  padding: var(--space-6);
  max-width: 420px;
  margin-top: -4rem;
  margin-left: var(--space-6);
}

@media (max-width: 640px) {
  .overlap-card { margin-top: -2.5rem; margin-left: var(--space-4); margin-right: var(--space-4); }
}

/* ---- Grid utilities for section-specific layouts ---- */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-6);
}

.grid-mosaic {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--space-5);
}

.grid-mosaic > * { grid-column: span 6; }

@media (min-width: 720px) {
  .grid-mosaic > *:nth-child(1) { grid-column: span 4; }
  .grid-mosaic > *:nth-child(2) { grid-column: span 2; }
  .grid-mosaic > *:nth-child(3) { grid-column: span 2; }
  .grid-mosaic > *:nth-child(4) { grid-column: span 4; }
}

.rule {
  border: none;
  border-top: 1px solid var(--border-subtle);
  margin: var(--space-8) 0;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--brand-accent);
  color: var(--text-inverse);
  padding: var(--space-2) var(--space-4);
  z-index: 999;
}

.skip-link:focus { left: 0; }