/* ---------------------------------------------------------------
   Page chrome: brandmark, chapter nav rail, progress bar,
   presenter-mode toggle, and the chapter section scaffold.
--------------------------------------------------------------- */

/* ambient depth glow, fixed behind everything */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 60vw 40vw at 15% -10%, rgba(65, 90, 119, 0.22), transparent 60%),
    radial-gradient(ellipse 50vw 40vw at 110% 60%, rgba(201, 169, 110, 0.1), transparent 65%);
}

/* -------- Top progress bar -------- */
.progress-bar {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  height: 2px;
  z-index: var(--z-chrome);
  background: transparent;
}
.progress-bar__fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--slate-500), var(--gold));
  transform-origin: left;
}

/* -------- Brandmark -------- */
.brandmark {
  position: fixed;
  top: var(--space-sm);
  left: var(--gutter);
  z-index: var(--z-chrome);
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--mist-100);
  mix-blend-mode: normal;
}
.brandmark__mark {
  width: 22px; height: 22px;
  object-fit: contain;
  flex: none;
}

/* -------- Chapter nav rail -------- */
.navrail {
  position: fixed;
  right: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  z-index: var(--z-chrome);
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: flex-end;
}
.navrail__item {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-faint);
  transition: color var(--dur-fast) var(--ease-out);
}
.navrail__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  white-space: nowrap;
  opacity: 0;
  transform: translateX(6px);
  transition: opacity var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}
.navrail__dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--border-strong);
  transition: background var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
  flex: none;
}
.navrail__item:hover .navrail__label,
.navrail__item.is-active .navrail__label {
  opacity: 1;
  transform: translateX(0);
}
.navrail__item.is-active { color: var(--mist-100); }
.navrail__item.is-active .navrail__dot {
  background: var(--gold);
  transform: scale(1.5);
  box-shadow: 0 0 12px rgba(201, 169, 110, 0.7);
}
.navrail__item:hover .navrail__dot { background: var(--steel-400); }

@media (max-width: 860px) {
  .navrail { display: none; }
}

/* -------- Presenter mode toggle + arrows -------- */
.presenter-controls {
  position: fixed;
  bottom: var(--space-sm);
  right: var(--gutter);
  z-index: var(--z-chrome);
  display: flex;
  align-items: center;
  gap: 10px;
}
.presenter-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: rgba(8, 15, 24, 0.6);
  backdrop-filter: blur(10px);
  color: var(--mist-300);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  transition: border-color var(--dur-fast), color var(--dur-fast), background var(--dur-fast);
}
.presenter-toggle:hover {
  border-color: var(--gold);
  color: var(--gold-soft);
}
body.presenter-mode .presenter-toggle {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--navy-900);
}

.presenter-nav {
  display: none;
  align-items: center;
  gap: 6px;
}
body.presenter-mode .presenter-nav { display: flex; }
.presenter-nav__btn {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: rgba(8, 15, 24, 0.6);
  color: var(--mist-100);
  transition: border-color var(--dur-fast), transform var(--dur-fast);
}
.presenter-nav__btn:hover { border-color: var(--gold); transform: translateY(-1px); }
.presenter-nav__count {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-faint);
  min-width: 44px;
  text-align: center;
}

/* -------- Scroll cue (hero only) -------- */
.scroll-cue {
  position: absolute;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.scroll-cue__line {
  width: 1px; height: 34px;
  background: linear-gradient(var(--mist-100), transparent);
  animation: scrollcue 2.2s ease-in-out infinite;
}
@keyframes scrollcue {
  0% { transform: scaleY(0); transform-origin: top; opacity: 0; }
  40% { transform: scaleY(1); transform-origin: top; opacity: 1; }
  60% { transform: scaleY(1); transform-origin: bottom; opacity: 1; }
  100% { transform: scaleY(0); transform-origin: bottom; opacity: 0; }
}
body.presenter-mode .scroll-cue { display: none; }

/* -------- Chapter scaffold -------- */
#story { position: relative; z-index: var(--z-content); }

.chapter {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--space-2xl) 0;
  overflow: hidden;
}

.chapter__bg {
  position: absolute;
  inset: -6% -6%;
  z-index: var(--z-bg);
}
.chapter__bg img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center;
  will-change: transform;
}
.chapter__scrim {
  position: absolute;
  inset: 0;
  z-index: var(--z-bg);
}
.chapter__scrim--full {
  background: linear-gradient(180deg, rgba(8,15,24,0.55) 0%, rgba(8,15,24,0.86) 55%, var(--navy-900) 100%);
}
.chapter__scrim--side {
  background: linear-gradient(90deg, var(--navy-900) 10%, rgba(8,15,24,0.7) 45%, rgba(8,15,24,0.25) 100%);
}
.chapter__scrim--soft {
  background: linear-gradient(180deg, rgba(8,15,24,0.35), rgba(8,15,24,0.75));
}

.chapter__inner {
  position: relative;
  z-index: var(--z-content);
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--gutter) 0 calc(var(--gutter) * 1.1);
}

.chapter__header {
  margin-bottom: var(--space-lg);
  max-width: 46ch;
}
.chapter__header h2 { margin-top: var(--space-xs); }
.chapter__header .lead { margin-top: var(--space-sm); }

.grid-2 {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

@media (max-width: 900px) {
  .grid-2 { grid-template-columns: 1fr; gap: var(--space-lg); }
  .chapter { padding: var(--space-xl) 0; }
  .chapter__inner { padding: 0 var(--gutter); }
}

/* -------- Presenter mode: snap scrolling -------- */
body.presenter-mode {
  scroll-behavior: auto;
}
body.presenter-mode #story {
  scroll-snap-type: y proximity;
}
body.presenter-mode .chapter {
  scroll-snap-align: start;
  scroll-snap-stop: always;
  min-height: 100svh;
}

/* Presenter mode is a one-page-per-view experience: every non-pinned
   chapter must fit inside a single viewport with no internal scroll.
   Natural-scroll mode keeps the spacious padding below; presenter
   mode compacts it. Pinned chapters (journey/roadmap) are intentionally
   taller — the scroll-scrub *is* the interaction there.

   Top-aligned rather than centered: the fixed brandmark/nav-rail chrome
   occupies a fixed strip regardless of chapter, so a dense chapter that's
   exactly (or nearly) viewport-height must not be allowed to center and
   push its header up underneath that chrome. A steady top anchor keeps
   every page's header clear of it, at the cost of not perfectly
   vertically centering short chapters (they simply get extra breathing
   room below instead). */
body.presenter-mode .chapter {
  align-items: flex-start;
  padding: 64px 0 var(--space-sm);
}
body.presenter-mode .chapter__header {
  margin-bottom: var(--space-sm);
}
body.presenter-mode .chapter__header .lead {
  margin-top: var(--space-2xs);
}

/* -------- Generic reveal primitive -------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
}
.reduced-motion [data-reveal] {
  opacity: 1 !important;
  transform: none !important;
}