/* T1 Chapter Spine — timeline page */

.page-timeline {
  background: var(--slate);
  color: var(--white);
}

.page-timeline .site-header .logo,
.page-timeline .site-nav a {
  mix-blend-mode: difference;
}

.tl-hero {
  padding: calc(var(--header-h) + 3rem) var(--space) 2.5rem;
  max-width: var(--max);
  margin: 0 auto;
}

.tl-hero .eyebrow {
  margin: 0 0 0.75rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  opacity: 0.78;
}

.tl-hero h1 {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.tl-hero .dek {
  margin: 0;
  max-width: 36rem;
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  line-height: 1.55;
  opacity: 0.88;
}

.tl-hero .intro-soft {
  margin: 1.25rem 0 0;
  max-width: 40rem;
  font-size: 1rem;
  line-height: 1.65;
  opacity: 0.72;
}

/* Present chip (mobile sticky) */
.tl-present-chip {
  display: none;
  position: sticky;
  top: calc(var(--header-h) + 0.5rem);
  z-index: 80;
  width: fit-content;
  margin: 0 var(--space) 1rem auto;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  background: var(--coral);
  color: var(--white);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

@media (max-width: 900px) {
  .tl-present-chip { display: inline-flex; align-items: center; gap: 0.4rem; }
}

/* Spine layout */
.tl-spine-wrap {
  position: relative;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--space) 4rem;
}

.tl-spine {
  position: absolute;
  left: calc(var(--space) + 1.1rem);
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.35),
    rgba(255, 255, 255, 0.12) 40%,
    rgba(255, 77, 106, 0.85)
  );
  pointer-events: none;
}

@media (max-width: 900px) {
  .tl-spine { display: none; }
}

.tl-era {
  position: relative;
  margin: 0 calc(-1 * var(--space));
  padding: clamp(2.5rem, 6vw, 4.5rem) var(--space);
  scroll-margin-top: var(--header-h);
}

.tl-era-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding-left: 4.5rem;
  display: grid;
  gap: 0.85rem;
}

@media (max-width: 900px) {
  .tl-era-inner { padding-left: 0; }
}

.tl-era.chapter-slate {
  background: var(--slate);
  color: var(--white);
}
.tl-era.chapter-cream {
  background: var(--cream);
  color: var(--ink);
}
.tl-era.chapter-charcoal {
  background: var(--charcoal);
  color: var(--cream);
}

.tl-era.chapter-cream .tl-years,
.tl-era.chapter-cream .tl-blurb,
.tl-era.chapter-cream .tl-soon {
  color: var(--muted-on-cream);
}
.tl-era.chapter-cream .tl-city { color: var(--ink); }

.tl-node {
  position: absolute;
  left: calc(var(--space) + 0.55rem);
  top: clamp(2.8rem, 6vw, 5rem);
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.85);
  background: transparent;
  z-index: 2;
}

.tl-era.chapter-cream .tl-node {
  border-color: rgba(17, 17, 17, 0.45);
  background: var(--cream);
}

.tl-era.is-present .tl-node {
  border-color: var(--coral);
  background: var(--coral);
  box-shadow: 0 0 0 6px rgba(255, 77, 106, 0.28);
}

.tl-era.is-present .tl-node::after {
  content: "";
  position: absolute;
  inset: -10px;
  border-radius: 50%;
  border: 1px solid rgba(255, 45, 111, 0.55);
  animation: tl-pulse 2.4s var(--ease) infinite;
}

@media (prefers-reduced-motion: reduce) {
  .tl-era.is-present .tl-node::after { animation: none; }
}

@keyframes tl-pulse {
  0% { transform: scale(0.85); opacity: 0.9; }
  70% { transform: scale(1.25); opacity: 0; }
  100% { transform: scale(1.25); opacity: 0; }
}

@media (max-width: 900px) {
  .tl-node { display: none; }
}

.tl-city {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.5rem, 4vw, 2.6rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.tl-years {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.78;
}

.tl-era.is-present .tl-years {
  color: var(--coral);
  opacity: 1;
}

.tl-present-label {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 0.35rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--coral);
}

.tl-present-label::before {
  content: "";
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 0 3px rgba(255, 77, 106, 0.3);
}

.tl-blurb {
  margin: 0.35rem 0 0;
  max-width: 38rem;
  font-size: 1.05rem;
  line-height: 1.65;
  opacity: 0.88;
}

.tl-icons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1rem;
}

.tl-icon-slot {
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 50%;
  border: 1.5px dashed currentColor;
  opacity: 0.35;
  background: transparent;
  cursor: not-allowed;
  padding: 0;
  display: inline-grid;
  place-items: center;
}

.tl-icon-slot svg {
  width: 1rem;
  height: 1rem;
  opacity: 0.7;
}

.tl-soon {
  margin: 0.35rem 0 0;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  opacity: 0.55;
}

/* Mobile chapter-dots for eras */
.tl-dots {
  display: none;
}

@media (max-width: 900px) {
  .tl-dots {
    display: flex;
    position: fixed;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    z-index: 190;
    flex-direction: column;
    gap: 0.55rem;
  }
  .tl-dots a {
    width: 0.55rem;
    height: 0.55rem;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.35);
    border: 1px solid rgba(255, 255, 255, 0.5);
    text-decoration: none;
  }
  .tl-dots a.is-active {
    background: var(--coral);
    border-color: var(--coral);
    transform: scale(1.25);
  }
  .tl-dots a[data-present="true"].is-active {
    background: var(--coral);
    box-shadow: 0 0 0 4px rgba(255, 77, 106, 0.35);
  }
}

.page-timeline .site-footer {
  background: var(--charcoal);
  color: var(--cream);
}


/* Era aerial photos */
.tl-era-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: clamp(1.25rem, 3vw, 2.5rem);
  align-items: center;
}
.tl-era-copy { min-width: 0; }
.tl-aerial {
  margin: 0;
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: 0 18px 50px rgba(0,0,0,0.28);
}
.tl-aerial img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}
.chapter-cream .tl-aerial {
  box-shadow: 0 18px 50px rgba(0,0,0,0.12);
}
@media (max-width: 820px) {
  .tl-era-grid {
    grid-template-columns: 1fr;
  }
  .tl-aerial { order: 2; }
  .tl-era-copy { order: 1; }
}