/* =================================================================
   LEDGER.CSS — The Ledger: A Scrollytelling Monument
   Settlement Integrity Institute
   ================================================================= */

/* -----------------------------------------------------------------
   CSS CUSTOM PROPERTIES
   ----------------------------------------------------------------- */
:root {
  --navy-deep:        #0F1A30;
  --navy:             #1B2A4A;
  --bronze:           #8B7355;
  --bronze-light:     #A99579;
  --parchment:        #F8F6F3;
  --body-text:        #D8D4CE;
  --muted-text:       #8A8680;
  --spine-x:          60px;
  --spine-x-mobile:   24px;
  --era-pad-left:     120px;
  --era-pad-left-md:  90px;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in:  cubic-bezier(0.4, 0, 1, 1);
  --ease-io:  cubic-bezier(0.4, 0, 0.2, 1);
}

/* -----------------------------------------------------------------
   PAGE ROOT
   ----------------------------------------------------------------- */
.ledger-page {
  background: var(--navy-deep);
  color: var(--body-text);
  font-family: 'DM Sans', sans-serif;
  overflow-x: hidden;
  position: relative;
}

/* Nav override — make nav blend on ledger */
.ledger-page .nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(15, 26, 48, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(139, 115, 85, 0.12);
}

/* Active nav item */
.ledger-page .nav__links a.nav__active {
  color: var(--bronze-light);
  border-bottom: 1px solid var(--bronze);
}

/* -----------------------------------------------------------------
   CROSSHATCH GRID TEXTURE (CSS-only, reusable)
   ----------------------------------------------------------------- */
.ledger-crosshatch {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(139, 115, 85, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139, 115, 85, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

/* -----------------------------------------------------------------
   HERO — OPENING CINEMATIC
   ----------------------------------------------------------------- */
.ledger-hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--navy-deep);
  overflow: hidden;
}

.ledger-hero__vignette {
  position: absolute;
  inset: 0;
  background: radial-gradient(
    ellipse 80% 80% at 50% 50%,
    transparent 30%,
    rgba(7, 12, 22, 0.55) 65%,
    rgba(7, 12, 22, 0.88) 100%
  );
  pointer-events: none;
  z-index: 1;
}

.ledger-hero__ambient {
  position: absolute;
  inset: 0;
  overflow: hidden;
  z-index: 0;
  pointer-events: none;
}

.ledger-hero__ambient-num {
  position: absolute;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 300;
  color: var(--bronze);
  opacity: 0;
  user-select: none;
  white-space: nowrap;
  animation: heroAmbientFloat 20s ease-in-out infinite;
}

@keyframes heroAmbientFloat {
  0%   { opacity: 0;    transform: translateY(0); }
  15%  { opacity: 1; }
  85%  { opacity: 1; }
  100% { opacity: 0;    transform: translateY(-30px); }
}

.ledger-hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 120px 24px 80px;
  max-width: 860px;
}

.ledger-hero__institute {
  display: block;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--bronze);
  margin-bottom: 32px;
  text-align: center;
  opacity: 0;
  animation: heroFadeUp 1s var(--ease-out) 0.4s forwards;
}

.ledger-hero__title {
  font-family: 'DM Serif Display', Georgia, serif;
  font-size: clamp(4rem, 11vw, 9rem);
  font-weight: 400;
  line-height: 0.92;
  color: var(--parchment);
  margin: 0 0 40px;
  letter-spacing: -0.02em;
  opacity: 0;
  animation: heroFadeUp 1.1s var(--ease-out) 0.6s forwards;
}

.ledger-hero__subtitle {
  font-family: 'DM Sans', sans-serif;
  font-size: clamp(1rem, 2vw, 1.2rem);
  font-weight: 300;
  color: var(--body-text);
  max-width: 540px;
  margin: 0 auto 56px;
  line-height: 1.7;
  opacity: 0;
  animation: heroFadeUp 1s var(--ease-out) 0.9s forwards;
}

.ledger-hero__scroll {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  opacity: 0;
  animation: heroFadeUp 1s var(--ease-out) 1.3s forwards;
}

.ledger-hero__scroll-label {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.65rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--muted-text);
}

.ledger-hero__chevron {
  width: 20px;
  height: 20px;
  border-right: 1.5px solid var(--bronze);
  border-bottom: 1.5px solid var(--bronze);
  transform: rotate(45deg);
  animation: heroPulse 2s ease-in-out infinite;
}

@keyframes heroPulse {
  0%, 100% { opacity: 0.3; transform: rotate(45deg) translateY(0); }
  50%       { opacity: 1;   transform: rotate(45deg) translateY(5px); }
}

@keyframes heroFadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* -----------------------------------------------------------------
   BRONZE SPINE — Fixed, runs full page height
   ----------------------------------------------------------------- */
.ledger-spine {
  position: fixed;
  left: var(--spine-x);
  top: 0;
  bottom: 0;
  width: 1px;
  z-index: 100;
  pointer-events: none;
  transform: translateX(-50%);
}

.ledger-spine__line {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 1px;
  background: rgba(139, 115, 85, 0.40);
}

.ledger-spine__fill {
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  background: var(--bronze);
  height: 0%;
  transition: height 0.4s var(--ease-io);
}

.ledger-spine__nodes {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: all;
}

.ledger-spine__node {
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%) scale(1);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1.5px solid rgba(139, 115, 85, 0.35);
  background: var(--navy-deep);
  box-shadow: none;
  cursor: pointer;
  /* Recede — slow, ceremonial fade. The era passes. */
  transition:
    background 1.2s cubic-bezier(0.25, 0.46, 0.45, 0.94),
    border-color 1.4s cubic-bezier(0.25, 0.46, 0.45, 0.94),
    box-shadow 1.6s cubic-bezier(0.25, 0.46, 0.45, 0.94),
    transform 1.0s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.ledger-spine__node.is-active {
  background: var(--bronze);
  border-color: var(--bronze);
  box-shadow: 0 0 0 5px rgba(139, 115, 85, 0.15), 0 0 24px rgba(139, 115, 85, 0.25);
  transform: translate(-50%, -50%) scale(1.4);
  /* Illuminate — brief delay so the fill line visually arrives first,
     then the node blooms. The line and the light meet at the destination. */
  transition:
    background 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) 0.15s,
    border-color 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) 0.15s,
    box-shadow 1.2s cubic-bezier(0.25, 0.46, 0.45, 0.94) 0.2s,
    transform 0.7s cubic-bezier(0.34, 1.56, 0.64, 1) 0.1s;
}

.ledger-spine__node-label {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.55rem;
  font-weight: 400;
  color: rgba(139, 115, 85, 0.5);
  letter-spacing: 0.05em;
  white-space: nowrap;
  transition: color 0.3s var(--ease-out), opacity 0.3s;
  pointer-events: none;
}

.ledger-spine__node.is-active .ledger-spine__node-label {
  color: var(--bronze-light);
  opacity: 1;
}

/* -----------------------------------------------------------------
   ERA SECTIONS
   ----------------------------------------------------------------- */
.ledger-era {
  position: relative;
  min-height: 80vh;
  padding: 100px 80px 100px var(--era-pad-left);
  overflow: hidden;
  background: var(--navy-deep);
  transition: background 1.2s var(--ease-io);
}

/* Color temperature shift for modern eras */
.ledger-era--era-8  { background: #141e38; }
.ledger-era--era-9  { background: var(--navy); }
.ledger-era--era-10 { background: var(--navy-deep); }

/* Max reading width container */
.ledger-era__inner {
  max-width: 900px;
  position: relative;
  z-index: 2;
}

/* Era number in Roman numeral */
.ledger-era__num {
  display: block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  color: var(--bronze);
  margin-bottom: 10px;
  text-transform: uppercase;
}

/* Year range */
.ledger-era__year {
  display: block;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--bronze-light);
  opacity: 0.65;
  margin-bottom: 24px;
}

/* Era title — the main visual weight */
.ledger-era__title {
  font-family: 'DM Serif Display', Georgia, serif;
  font-size: clamp(3rem, 6vw, 5.5rem);
  font-weight: 400;
  line-height: 1.0;
  letter-spacing: -0.02em;
  color: var(--parchment);
  margin: 0 0 36px;
}

/* Bronze rule */
.ledger-era__rule {
  display: block;
  width: 80px;
  height: 1.5px;
  background: var(--bronze);
  border: none;
  margin: 0 0 36px;
  opacity: 0.7;
}

/* Body copy */
.ledger-era__body {
  max-width: 680px;
}

.ledger-era__body p {
  font-family: 'DM Sans', sans-serif;
  font-size: clamp(0.95rem, 1.5vw, 1.05rem);
  font-weight: 300;
  line-height: 1.8;
  color: var(--body-text);
  margin: 0 0 1.4em;
}

.ledger-era__body p:last-child {
  margin-bottom: 0;
}

/* -----------------------------------------------------------------
   AMBIENT DATA — Ghosted numbers behind each era
   ----------------------------------------------------------------- */
.ledger-era__ambient {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 1;
}

.ledger-ambient-num {
  position: absolute;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 300;
  color: var(--bronze);
  white-space: nowrap;
  user-select: none;
  line-height: 1;
}

/* -----------------------------------------------------------------
   SCROLL REVEAL — JS-driven .is-visible class
   ----------------------------------------------------------------- */
.ledger-era__inner {
  opacity: 0;
  transform: translateY(0); /* no layout shift — use opacity only */
  transition:
    opacity 0.9s var(--ease-out),
    filter 0.9s var(--ease-out);
  filter: blur(1px);
}

.ledger-era__inner.is-visible {
  opacity: 1;
  filter: blur(0);
}

/* Ambient data reveal */
.ledger-ambient-num {
  opacity: 0;
  transition: opacity 1.5s var(--ease-out);
}

.ledger-era.is-era-visible .ledger-ambient-num {
  /* opacity set by inline style — just enable transition */
}

/* Era header elements stagger */
.ledger-era__inner.is-visible .ledger-era__num {
  animation: eraFadeIn 0.6s var(--ease-out) 0.1s both;
}
.ledger-era__inner.is-visible .ledger-era__year {
  animation: eraFadeIn 0.6s var(--ease-out) 0.2s both;
}
.ledger-era__inner.is-visible .ledger-era__rule {
  animation: eraRuleIn 0.8s var(--ease-out) 0.55s both;
}
.ledger-era__inner.is-visible .ledger-era__body {
  animation: eraFadeIn 0.9s var(--ease-out) 0.65s both;
}

@keyframes eraFadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes eraRuleIn {
  from { transform: scaleX(0); transform-origin: left; opacity: 0; }
  to   { transform: scaleX(1); transform-origin: left; opacity: 0.7; }
}

/* Splitting.js character stagger for era titles */
.ledger-era__title .char {
  display: inline-block;
  opacity: 0;
  transition: opacity 0.4s var(--ease-out);
}

.ledger-era__inner.is-visible .ledger-era__title .char {
  opacity: 1;
}

/* -----------------------------------------------------------------
   ERA X — THE FINAL MONOLITH
   ----------------------------------------------------------------- */
.ledger-final {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--navy-deep);
  overflow: hidden;
  padding: 80px 24px;
}

.ledger-final__inner {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  opacity: 0;
  transition: opacity 1.4s var(--ease-out);
}

.ledger-final__inner.is-visible {
  opacity: 1;
}

.ledger-final__monolith {
  display: block;
  width: clamp(260px, 50vw, 400px);
  margin: 0 auto 52px;
  opacity: 0;
  transition: opacity 1.6s var(--ease-out) 0.3s;
}

.ledger-final__inner.is-visible .ledger-final__monolith {
  opacity: 1;
}

.ledger-final__tagline {
  font-family: 'DM Serif Display', Georgia, serif;
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  font-weight: 400;
  font-style: italic;
  color: var(--parchment);
  margin: 0 0 28px;
  letter-spacing: 0.01em;
  opacity: 0;
  transition: opacity 1s var(--ease-out) 0.8s;
  max-width: 560px;
}

.ledger-final__inner.is-visible .ledger-final__tagline {
  opacity: 1;
}

.ledger-final__meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  font-weight: 300;
  letter-spacing: 0.2em;
  color: var(--bronze-light);
  opacity: 0;
  text-transform: uppercase;
  margin-bottom: 56px;
  transition: opacity 1s var(--ease-out) 1.1s;
}

.ledger-final__inner.is-visible .ledger-final__meta {
  opacity: 0.55;
}

.ledger-final__ctas {
  display: flex;
  gap: 32px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
  opacity: 0;
  transition: opacity 1s var(--ease-out) 1.4s;
}

.ledger-final__inner.is-visible .ledger-final__ctas {
  opacity: 1;
}

.ledger-final__cta {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--bronze-light);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid rgba(139, 115, 85, 0.3);
  padding-bottom: 4px;
  transition:
    color 180ms var(--ease-out),
    border-color 180ms var(--ease-out);
}

.ledger-final__cta:hover {
  color: var(--parchment);
  border-color: var(--bronze-light);
}

.ledger-final__cta--primary {
  color: var(--parchment);
  border-color: rgba(248, 246, 243, 0.35);
}

.ledger-final__cta--primary:hover {
  border-color: var(--parchment);
}

/* Spine termination — filled circle at the end */
.ledger-final__spine-terminus {
  position: absolute;
  left: var(--spine-x);
  top: 50%;
  transform: translate(-50%, -50%);
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bronze);
  box-shadow: 0 0 0 6px rgba(139, 115, 85, 0.15), 0 0 32px rgba(139, 115, 85, 0.4);
  z-index: 5;
  opacity: 0;
  transition: opacity 1s var(--ease-out) 0.2s;
}

.ledger-final.is-era-visible .ledger-final__spine-terminus {
  opacity: 1;
}

/* -----------------------------------------------------------------
   DIVIDERS BETWEEN ERAS
   ----------------------------------------------------------------- */
.ledger-era-divider {
  position: relative;
  height: 1px;
  background: rgba(139, 115, 85, 0.08);
  margin: 0;
  z-index: 2;
}

/* -----------------------------------------------------------------
   MOBILE — Spine becomes horizontal progress bar
   ----------------------------------------------------------------- */
@media (max-width: 768px) {
  .ledger-spine {
    display: none;
  }

  .ledger-progress-bar {
    display: flex;
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    height: 2px;
    z-index: 200;
    background: rgba(139, 115, 85, 0.15);
  }

  .ledger-progress-bar__fill {
    height: 100%;
    background: var(--bronze);
    transition: width 0.2s linear;
    width: 0%;
  }

  .ledger-era {
    padding: 80px 24px 80px 24px;
    min-height: 70vh;
  }

  .ledger-era__title {
    font-size: clamp(2.2rem, 9vw, 3.5rem);
  }

  .ledger-final__ctas {
    flex-direction: column;
    gap: 20px;
  }

  .ledger-final__spine-terminus {
    left: 50%;
    top: 60px;
  }
}

@media (min-width: 769px) {
  .ledger-progress-bar {
    display: none;
  }
}

@media (max-width: 1024px) and (min-width: 769px) {
  :root {
    --spine-x: 40px;
    --era-pad-left: 80px;
  }
}

/* -----------------------------------------------------------------
   THE LEXICON — Words drifting in Era X
   ----------------------------------------------------------------- */
.ledger-lexicon {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 1;
}

.ledger-lexicon__word {
  position: absolute;
  font-family: 'DM Serif Display', Georgia, serif;
  font-weight: 400;
  color: var(--parchment);
  letter-spacing: 0.04em;
  white-space: nowrap;
  user-select: none;
  opacity: 0;
  will-change: opacity, transform;
  animation-timing-function: ease-in-out;
  animation-fill-mode: both;
}

@keyframes lexiconDrift {
  0%   { opacity: 0;   transform: translateY(12px); }
  18%  { opacity: 1; }
  75%  { opacity: 1;   transform: translateY(0px); }
  100% { opacity: 0;   transform: translateY(-10px); }
}

/* -----------------------------------------------------------------
   REDUCED MOTION — Respect prefers-reduced-motion
   ----------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .ledger-hero__institute,
  .ledger-hero__title,
  .ledger-hero__subtitle,
  .ledger-hero__scroll {
    opacity: 1;
    animation: none;
  }

  .ledger-hero__chevron {
    animation: none;
    opacity: 0.7;
  }

  .ledger-era__inner {
    opacity: 1;
    filter: none;
    transition: none;
  }

  .ledger-era__inner.is-visible .ledger-era__num,
  .ledger-era__inner.is-visible .ledger-era__year,
  .ledger-era__inner.is-visible .ledger-era__rule,
  .ledger-era__inner.is-visible .ledger-era__body {
    animation: none;
    opacity: 1;
  }

  .ledger-era__title .char {
    opacity: 1;
    transition: none;
  }

  .ledger-final__inner,
  .ledger-final__monolith,
  .ledger-final__tagline,
  .ledger-final__meta,
  .ledger-final__ctas {
    opacity: 1;
    transition: none;
  }

  .ledger-ambient-num {
    transition: none;
  }

  .ledger-hero__ambient-num {
    animation: none;
    opacity: 0.03;
  }

  .ledger-lexicon__word {
    animation: none;
    opacity: 0;
  }
}

/* -----------------------------------------------------------------
   ERA SECTION SEPARATOR — subtle breath between eras
   ----------------------------------------------------------------- */
.ledger-era + .ledger-era {
  border-top: 1px solid rgba(139, 115, 85, 0.06);
}

/* -----------------------------------------------------------------
   SPLITTING.JS — Force word-wrap on title spans
   ----------------------------------------------------------------- */
.ledger-era__title .word {
  display: inline-block;
  overflow: visible;
  white-space: normal;
}

/* Ensure long era titles wrap cleanly on mobile */
@media (max-width: 768px) {
  .ledger-era__title {
    overflow-wrap: break-word;
    word-break: normal;
    hyphens: none;
  }
  .ledger-era__title .word {
    white-space: normal;
  }
}

/* -----------------------------------------------------------------
   SCROLL CUE fade out on scroll
   ----------------------------------------------------------------- */
.ledger-hero__scroll {
  transition: opacity 0.4s ease;
}

.ledger-hero__scroll.is-hidden {
  opacity: 0 !important;
  pointer-events: none;
}

/* -----------------------------------------------------------------
   FOOTER — Hidden on Ledger page (immersive design, self-contained)
   ----------------------------------------------------------------- */
.footer--ledger-hidden {
  display: none !important;
}

/* -----------------------------------------------------------------
   BACK TO TOP — Minimal Ledger-specific footer replacement
   ----------------------------------------------------------------- */
.ledger-backtop {
  background: var(--navy-deep);
  border-top: 1px solid rgba(139, 115, 85, 0.15);
  padding: 2.5rem var(--era-pad-left);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  z-index: 10;
}

.ledger-backtop__btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: rgba(139, 115, 85, 0.7);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transition: color 250ms ease;
}

.ledger-backtop__btn svg {
  width: 16px;
  height: 16px;
  transition: transform 250ms ease;
}

.ledger-backtop__btn:hover {
  color: rgba(139, 115, 85, 1);
}

.ledger-backtop__btn:hover svg {
  transform: translateY(-3px);
}

.ledger-backtop__copy {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: rgba(139, 115, 85, 0.3);
}

/* -----------------------------------------------------------------
   SPINE — Hide when back-to-top is in view
   ----------------------------------------------------------------- */
.ledger-spine--hidden {
  opacity: 0;
  transition: opacity 0.6s ease;
}