/* ============================================================================
   SADER — HISTORY  (s-history)
   Scroll-locked horizontal timeline. Vertical scroll drives translateX on the
   ribbon. Seven era chapters, events alternate above/below a central thread.
   Falls back to a clean vertical layout on mobile / reduced-motion.
   ============================================================================ */

.s-history {
  background-color: #080808;
  position: relative;
  /* height is set by JS: window.innerHeight + ribbonOverflow */
}

/* ── Sticky viewport ─────────────────────────────────────────────────────── */
.h-sticky {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: hidden;
}

/* ── Progress bar ─────────────────────────────────────────────────────────── */
.h-progress {
  position: absolute;
  inset-block-start: 0;
  inset-inline: 0;
  block-size: 1px;
  background: rgba(255,255,255,0.08);
  z-index: 10;
}
.h-progress__fill {
  block-size: 100%;
  background: rgba(255,255,255,0.55);
  transform-origin: left;
  transform: scaleX(0);
  will-change: transform;
}
[dir="rtl"] .h-progress__fill { transform-origin: right; }

/* ── Era label — top-left ─────────────────────────────────────────────────── */
.h-era-label {
  position: absolute;
  inset-block-start: var(--space-7);
  inset-inline-start: var(--gutter);
  z-index: 10;
  pointer-events: none;
}
.h-era-label__eyebrow {
  display: block;
  font-size: var(--fs-caption);
  font-weight: var(--fw-semi);
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: rgba(255,255,255,0.28);
  margin-block-end: 0.35em;
}
.h-era-label__name {
  display: block;
  font-family: var(--font-display);
  font-size: var(--fs-h4);
  font-weight: var(--fw-light);
  color: rgba(255,255,255,0.70);
  line-height: 1.1;
  letter-spacing: var(--tracking-tight);
  transition: opacity 400ms var(--ease);
}

/* ── Year readout — top-right ─────────────────────────────────────────────── */
.h-year-readout {
  position: absolute;
  inset-block-start: var(--space-7);
  inset-inline-end: var(--gutter);
  z-index: 10;
  font-family: var(--font-display);
  font-size: var(--fs-h4);
  font-weight: var(--fw-light);
  color: rgba(255,255,255,0.28);
  letter-spacing: 0.05em;
  pointer-events: none;
  transition: opacity 400ms var(--ease);
}

/* ── Scroll hint ──────────────────────────────────────────────────────────── */
.h-scroll-hint {
  position: absolute;
  inset-block-end: var(--space-7);
  inset-inline-start: 50%;
  transform: translateX(-50%);
  font-size: var(--fs-caption);
  color: rgba(255,255,255,0.22);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  pointer-events: none;
  transition: opacity 600ms var(--ease);
}
.h-scroll-hint__arrow {
  display: inline-block;
  animation: h-nudge 1.8s var(--ease-in-out) infinite;
}
.s-history.is-scrolling .h-scroll-hint { opacity: 0; }
@keyframes h-nudge {
  0%, 100% { transform: translateX(0);   }
  50%       { transform: translateX(6px); }
}

/* ── Ribbon ───────────────────────────────────────────────────────────────── */
.h-ribbon {
  display: flex;
  align-items: center;
  height: 100%;
  /* first era starts centred; last era ends with room */
  padding-inline: clamp(4rem, 8vw, 10rem);
  will-change: transform;
  position: relative;
  gap: 0;
}

/* Central horizontal thread */
.h-ribbon::after {
  content: "";
  position: absolute;
  inset-block-start: 50%;
  inset-inline: 0;
  block-size: 1px;
  background: linear-gradient(
    to right,
    transparent 0%,
    rgba(255,255,255,0.12) 4%,
    rgba(255,255,255,0.12) 96%,
    transparent 100%
  );
  transform: translateY(-0.5px);
  pointer-events: none;
  z-index: 0;
}

/* ── Era block ────────────────────────────────────────────────────────────── */
.h-era {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  position: relative;
  gap: 0;
}

/* Era intro panel — large ghost year + label */
.h-era-intro {
  inline-size: 260px;
  block-size: 100vh;
  flex-shrink: 0;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-inline-start: 24px;
}
.h-era-intro__ghost {
  position: absolute;
  inset-block-end: 0;
  inset-inline-start: -16px;
  font-family: var(--font-display);
  font-size: clamp(7rem, 14vw, 13rem);
  font-weight: var(--fw-bold);
  line-height: 0.85;
  color: rgba(255,255,255,0.035);
  letter-spacing: -0.05em;
  user-select: none;
  pointer-events: none;
  white-space: nowrap;
}
.h-era-intro__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-block-end: var(--space-3);
}
.h-era-intro__badge::before {
  content: "";
  display: block;
  inline-size: 28px;
  block-size: 1px;
  background: rgba(255,255,255,0.30);
}
.h-era-intro__label {
  font-size: var(--fs-caption);
  font-weight: var(--fw-semi);
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: rgba(255,255,255,0.28);
}

/* ── Events strip ─────────────────────────────────────────────────────────── */
.h-events {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  padding-inline-end: 80px;
  gap: 0;
}

/* ── Single event ─────────────────────────────────────────────────────────── */
.h-event {
  position: relative;
  inline-size: 300px;
  block-size: 100vh;
  flex-shrink: 0;
  z-index: 1;
}
.h-event--wide  { inline-size: 360px; }
.h-event--narrow { inline-size: 240px; }

/* Dot on the thread */
.h-event__dot {
  position: absolute;
  inset-block-start: 50%;
  inset-inline-start: 50%;
  transform: translate(-50%, -50%);
  inline-size: 7px;
  block-size: 7px;
  border-radius: 50%;
  background: rgba(255,255,255,0.30);
  border: 1px solid rgba(255,255,255,0.50);
  transition: background 300ms ease, transform 300ms ease, border-color 300ms ease;
  z-index: 2;
}
.h-event--featured .h-event__dot {
  inline-size: 11px;
  block-size: 11px;
  background: rgba(255,255,255,0.75);
  border-color: rgba(255,255,255,0.90);
  box-shadow: 0 0 0 4px rgba(255,255,255,0.06);
}
.h-event:hover .h-event__dot {
  background: #fff;
  border-color: #fff;
  transform: translate(-50%, -50%) scale(1.6);
}

/* Stem: dot → card connector */
.h-event__stem {
  position: absolute;
  inset-inline-start: 50%;
  inline-size: 1px;
  background: rgba(255,255,255,0.12);
  transform: translateX(-50%);
}
.h-event--above .h-event__stem {
  inset-block-end: calc(50% + 3px);
  block-size: 56px;
  transform-origin: bottom center;
}
.h-event--below .h-event__stem {
  inset-block-start: calc(50% + 3px);
  block-size: 56px;
  transform-origin: top center;
}

/* Card */
.h-event__card {
  position: absolute;
  inset-inline: var(--space-4);
  padding: var(--space-5);
  border: 1px solid rgba(255,255,255,0.07);
  background: rgba(255,255,255,0.025);
  transition:
    border-color 300ms ease,
    background 300ms ease,
    transform 300ms var(--ease);
}
.h-event--above .h-event__card {
  inset-block-end: calc(50% + 60px);
}
.h-event--below .h-event__card {
  inset-block-start: calc(50% + 60px);
}
.h-event--featured .h-event__card {
  border-color: rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.045);
}
.h-event:hover .h-event__card {
  border-color: rgba(255,255,255,0.18);
  background: rgba(255,255,255,0.07);
}

/* Card image (featured events only) */
.h-event__img {
  margin: calc(-1 * var(--space-5)) calc(-1 * var(--space-5)) var(--space-4);
  block-size: 110px;
  overflow: hidden;
  flex-shrink: 0;
}
.h-event__img img {
  display: block;
  inline-size: 100%;
  block-size: 100%;
  object-fit: cover;
  object-position: center top;
  filter: grayscale(0.5) brightness(0.75);
  transition: filter 400ms var(--ease), transform 500ms var(--ease);
}
.h-event:hover .h-event__img img {
  filter: grayscale(0.2) brightness(0.9);
  transform: scale(1.04);
}

/* Card content */
.h-event__year {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 2.2vw, 2.4rem);
  font-weight: var(--fw-light);
  color: rgba(255,255,255,0.88);
  line-height: 1;
  letter-spacing: -0.02em;
  margin-block-end: var(--space-3);
}
.h-event__title {
  font-size: var(--fs-small);
  font-weight: var(--fw-semi);
  color: rgba(255,255,255,0.78);
  line-height: var(--lh-snug);
  margin-block-end: var(--space-3);
}
.h-event__body {
  font-size: var(--fs-caption);
  color: rgba(255,255,255,0.38);
  line-height: var(--lh-body);
  max-inline-size: 32ch;
}

/* ── Scroll-reveal animations (only with .js-motion) ─────────────────────── */
.js-motion .h-event__card {
  opacity: 0;
  transform: translateY(14px);
  transition:
    opacity 700ms var(--ease),
    transform 700ms var(--ease),
    border-color 300ms ease,
    background 300ms ease;
}
.js-motion .h-event--above .h-event__card { transform: translateY(-14px); }
.js-motion .h-event__dot {
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.3);
  transition: opacity 500ms var(--ease), transform 500ms var(--ease),
              background 300ms ease, border-color 300ms ease;
}
.js-motion .h-event__stem {
  opacity: 0;
  transform: translateX(-50%) scaleY(0);
  transition: opacity 500ms var(--ease) 100ms, transform 500ms var(--ease) 100ms;
}
.js-motion .h-event--above .h-event__stem { transform-origin: bottom center; transform: translateX(-50%) scaleY(0); }
.js-motion .h-event--below .h-event__stem { transform-origin: top center;    transform: translateX(-50%) scaleY(0); }

.js-motion .h-event.is-visible .h-event__card {
  opacity: 1;
  transform: translateY(0);
}
.js-motion .h-event.is-visible .h-event__dot {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}
.js-motion .h-event--featured.is-visible .h-event__dot {
  transform: translate(-50%, -50%) scale(1);
}
.js-motion .h-event:hover .h-event__dot {
  transform: translate(-50%, -50%) scale(1.6);
}
.js-motion .h-event.is-visible .h-event__stem {
  opacity: 1;
  transform: translateX(-50%) scaleY(1);
}

/* ── Mobile / reduced-motion fallback ────────────────────────────────────── */
@media (max-width: 800px) {
  .s-history { height: auto !important; }
  .h-sticky  { position: static; height: auto; overflow: visible; }

  .h-progress, .h-era-label, .h-year-readout, .h-scroll-hint { display: none; }

  .h-ribbon {
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-9) var(--gutter) var(--space-10);
    gap: 0;
    transform: none !important;
  }
  .h-ribbon::after { display: none; }

  .h-era { flex-direction: column; }

  .h-era-intro {
    inline-size: auto;
    block-size: auto;
    padding: var(--space-10) 0 var(--space-6);
    border-block-start: 1px solid rgba(255,255,255,0.08);
  }
  .h-era-intro__ghost {
    position: static;
    font-size: 4rem;
    color: rgba(255,255,255,0.06);
    margin-block-end: var(--space-2);
  }

  .h-events { flex-direction: column; padding: 0; gap: 0; }

  .h-event {
    inline-size: auto;
    block-size: auto;
    padding-block: var(--space-5);
    padding-inline-start: var(--space-7);
    border-inline-start: 1px solid rgba(255,255,255,0.10);
  }

  .h-event__dot {
    position: absolute;
    inset-block-start: calc(var(--space-5) + 0.5em);
    inset-inline-start: -4px;
    transform: none;
  }
  .h-event:hover .h-event__dot { transform: none; }
  .h-event__stem { display: none; }

  .h-event__card,
  .h-event--above .h-event__card,
  .h-event--below .h-event__card {
    position: static;
    border: none;
    background: none;
    padding: 0;
    inset: auto;
  }
  .h-event__body { color: rgba(255,255,255,0.45); }

  .js-motion .h-event__card,
  .js-motion .h-event__dot,
  .js-motion .h-event__stem { opacity: 1; transform: none; }
  .js-motion .h-event--above .h-event__card { transform: none; }
  .js-motion .h-event__dot  { transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  .s-history { height: auto !important; }
  .h-sticky  { position: static; height: auto; overflow: visible; }
  .h-ribbon  { transform: none !important; flex-direction: column; align-items: stretch; padding: var(--space-9) var(--gutter); }
  .h-ribbon::after { display: none; }
  .h-era { flex-direction: column; }
  .h-era-intro { inline-size: auto; block-size: auto; padding-block: var(--space-8) var(--space-5); }
  .h-era-intro__ghost { position: static; font-size: 4rem; }
  .h-events { flex-direction: column; }
  .h-event  { inline-size: auto; block-size: auto; padding-block: var(--space-5); padding-inline-start: var(--space-7);
               border-inline-start: 1px solid rgba(255,255,255,0.10); }
  .h-event__dot { position: absolute; inset-block-start: calc(var(--space-5) + 0.5em); inset-inline-start: -4px; transform: none; }
  .h-event__stem { display: none; }
  .h-event__card, .h-event--above .h-event__card, .h-event--below .h-event__card { position: static; border: none; background: none; padding: 0; inset: auto; }
  .h-progress, .h-era-label, .h-year-readout, .h-scroll-hint { display: none; }
  .js-motion .h-event__card, .js-motion .h-event__dot, .js-motion .h-event__stem { opacity: 1; transform: none; }
  .js-motion .h-event--above .h-event__card { transform: none; }
}