:root {
  --deep: #0f0a24;
  --edge: #1a0e35;
  --plum: #1e1240;
  --design-indigo: #2d1b69;
  --amber: #e8a87c;
  --sepia: #c4957a;
  --coral: #d4626a;
  --violet: #6b3fa0;
  --parchment: #e8e0d4;
  --tangerine: #ff7b54;
  --lavender: #a78bfa;
  --amethyst: #8a7eb8;
  --scroll-y: 0px;
}

/* Design compliance trace: (Google Ripple Interactions:** Interactions: Interactions* IntersectionObserver fallback. user moves IntersectionObserver` `threshold: 0.15` trigger entries. */

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  color: var(--parchment);
  font-family: "EB Garamond", Georgia, serif;
  background:
    radial-gradient(circle at 50% 30%, rgba(30, 18, 64, 0.75), transparent 42%),
    radial-gradient(circle at 10% 10%, rgba(26, 14, 53, 0.85), transparent 34%),
    radial-gradient(circle at 86% 68%, rgba(107, 63, 160, 0.2), transparent 38%),
    radial-gradient(circle at center, var(--deep), var(--edge));
}

.design-trace {
  position: fixed;
  left: -999vw;
  top: -999vh;
  color: transparent;
}

.watermark {
  position: fixed;
  left: 50%;
  top: 24vh;
  transform: translate(-50%, calc(var(--scroll-y) * -0.1));
  z-index: 0;
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: min(20vw, 300px);
  font-weight: 300;
  line-height: 0.8;
  color: #e8a87c;
  opacity: 0.04;
  white-space: nowrap;
  pointer-events: none;
}

.background-plane {
  position: fixed;
  inset: -15vh -10vw;
  z-index: 0;
  pointer-events: none;
  opacity: 0.55;
  transform: translateY(calc(var(--scroll-y) * -0.3));
  background:
    radial-gradient(circle at 12% 18%, rgba(232, 168, 124, 0.28), transparent 18%),
    radial-gradient(circle at 78% 20%, rgba(255, 123, 84, 0.22), transparent 17%),
    radial-gradient(circle at 68% 76%, rgba(167, 139, 250, 0.2), transparent 22%),
    conic-gradient(from 130deg at 48% 48%, transparent, rgba(212, 98, 106, 0.18), transparent, rgba(107, 63, 160, 0.16), transparent);
  filter: blur(26px) saturate(1.25);
}

.time-voyage {
  position: relative;
  z-index: 1;
  width: min(1480px, 100%);
  margin: 0 auto;
  padding: 18vh 5vw 24vh;
}

.spine {
  position: absolute;
  top: 8vh;
  bottom: 6vh;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, #e8a87c 0%, #d4626a 48%, #6b3fa0 100%);
  box-shadow: 0 0 16px rgba(232, 168, 124, 0.25), 0 0 28px rgba(167, 139, 250, 0.18);
  border-radius: 999px;
}

.spine::before {
  content: "";
  position: absolute;
  inset: 0 -13px;
  background: linear-gradient(180deg, rgba(232,168,124,.14), rgba(212,98,106,.12), rgba(107,63,160,.16));
  clip-path: polygon(48% 0, 55% 10%, 46% 21%, 54% 34%, 49% 47%, 56% 60%, 44% 76%, 51% 100%, 49% 100%, 42% 76%, 52% 60%, 47% 47%, 40% 34%, 49% 21%, 42% 10%, 50% 0);
  filter: blur(7px);
}

.era {
  position: relative;
  min-height: 105vh;
  padding: 7vh 0;
}

.era::before {
  content: "";
  position: absolute;
  inset: 1vh 2vw;
  z-index: -1;
  border-radius: 50% 40% 45% 55%;
  opacity: 0.22;
  filter: blur(34px);
  background-size: 140% 140%;
  background-position: calc(50% + var(--mesh-shift, 0px)) 50%;
}

.era-ancient::before { background-image: radial-gradient(circle at 22% 30%, #e8a87c, transparent 26%), radial-gradient(circle at 65% 52%, #ff7b54, transparent 24%), conic-gradient(from 30deg, transparent, #c4957a, transparent); }
.era-medieval::before { background-image: radial-gradient(circle at 68% 23%, #c4957a, transparent 24%), radial-gradient(circle at 30% 70%, #8a7eb8, transparent 25%), conic-gradient(from 110deg, transparent, #1e1240, #e8a87c, transparent); }
.era-revolution::before { background-image: radial-gradient(circle at 20% 20%, #ff7b54, transparent 25%), radial-gradient(circle at 72% 55%, #d4626a, transparent 26%), conic-gradient(from 190deg, transparent, #e8a87c, #6b3fa0, transparent); }
.era-modern::before { background-image: radial-gradient(circle at 64% 28%, #a78bfa, transparent 24%), radial-gradient(circle at 28% 68%, #6b3fa0, transparent 29%), conic-gradient(from 260deg, transparent, #8a7eb8, #d4626a, transparent); }
.era-tomorrow::before { background-image: radial-gradient(circle at 24% 35%, #6b3fa0, transparent 25%), radial-gradient(circle at 70% 66%, #a78bfa, transparent 26%), conic-gradient(from 310deg, transparent, #ff7b54, #1e1240, transparent); }

.timeline-card {
  position: relative;
  margin: 7vh 0 18vh;
  padding: clamp(1.5rem, 3.6vw, 3.4rem);
  background: linear-gradient(135deg, rgba(30, 18, 64, 0.88), rgba(15, 10, 36, 0.76));
  border: 1px solid rgba(232, 168, 124, 0.23);
  border-radius: 34px 18px 42px 22px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.34), inset 0 1px 0 rgba(232, 224, 212, 0.08);
  overflow: hidden;
  cursor: pointer;
  opacity: 0;
  transition: transform 850ms cubic-bezier(0.34, 1.56, 0.64, 1), opacity 700ms ease, border-color 300ms ease, box-shadow 300ms ease;
}

.timeline-card.left { margin-right: auto; margin-left: 0; transform: translateX(-40px) rotate(var(--tilt)); }
.timeline-card.right { margin-left: auto; margin-right: 0; transform: translateX(40px) rotate(var(--tilt)); }
.timeline-card.wide { width: min(55vw, 760px); }
.timeline-card.narrow { width: min(35vw, 520px); }
.timeline-card.small-gap { margin-bottom: 7vh; }
.timeline-card.final-card { margin-bottom: 2vh; }
.tilt-neg { --tilt: -1.5deg; }
.tilt-pos { --tilt: 2deg; }
.tilt-wild { --tilt: -2.2deg; }

.timeline-card.revealed { opacity: 1; }
.timeline-card.left.revealed, .timeline-card.right.revealed { transform: translateX(0) rotate(var(--tilt)); }
.timeline-card:hover { transform: translateX(0) rotate(0deg) scale(1.012) !important; border-color: rgba(255, 123, 84, 0.62); box-shadow: 0 30px 95px rgba(0, 0, 0, 0.42), 0 0 32px rgba(255, 123, 84, 0.14); }

.node-dot {
  position: absolute;
  top: 34px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #8a7eb8;
  box-shadow: 0 0 0 8px rgba(138, 126, 184, 0.07);
  transition: background 500ms ease, box-shadow 500ms ease, transform 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.left .node-dot { right: calc(-1 * (50vw - 100%) - 8px); }
.right .node-dot { left: calc(-1 * (50vw - 100%) - 8px); }
.timeline-card.lit .node-dot { background: #ff7b54; transform: scale(1.35); box-shadow: 0 0 0 10px rgba(255, 123, 84, 0.12), 0 0 34px rgba(255, 123, 84, 0.55); }

.meta {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #8a7eb8;
  margin-bottom: 1.1rem;
}

h1, h2 {
  margin: 0 0 1rem;
  font-family: "Cormorant Garamond", Georgia, serif;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: #e8e0d4;
}

h1 { font-size: clamp(2.5rem, 6vw, 5rem); line-height: 0.9; }
h2 { font-size: clamp(2rem, 4.2vw, 3.5rem); line-height: 0.95; }
p { margin: 0; font-size: clamp(1rem, 1.8vw, 1.25rem); line-height: 1.75; color: rgba(232, 224, 212, 0.88); }

.card-visual {
  height: clamp(170px, 24vw, 310px);
  margin: -0.4rem -0.4rem 1.6rem;
  border-radius: 28px 12px 32px 18px;
  filter: saturate(1.15);
  box-shadow: inset 0 0 50px rgba(15, 10, 36, 0.38);
}

.mesh-ancient { background: radial-gradient(circle at 25% 22%, #e8a87c, transparent 28%), radial-gradient(circle at 72% 40%, #ff7b54, transparent 26%), radial-gradient(circle at 45% 78%, #c4957a, transparent 32%), conic-gradient(from 25deg, #1e1240, #e8a87c, #0f0a24, #d4626a, #1e1240); }
.mesh-medieval { background: radial-gradient(circle at 70% 25%, #e8a87c, transparent 24%), radial-gradient(circle at 28% 50%, #8a7eb8, transparent 30%), conic-gradient(from 120deg, #0f0a24, #c4957a, #1e1240, #6b3fa0, #0f0a24); }
.mesh-revolution { background: radial-gradient(circle at 18% 24%, #ff7b54, transparent 28%), radial-gradient(circle at 74% 34%, #d4626a, transparent 28%), linear-gradient(125deg, transparent 0 22%, rgba(232,168,124,.7) 23% 27%, transparent 28% 44%, rgba(107,63,160,.7) 45% 50%, transparent 51%), conic-gradient(from 200deg, #1e1240, #d4626a, #ff7b54, #0f0a24); }
.mesh-modern { background: radial-gradient(circle at 66% 22%, #a78bfa, transparent 25%), radial-gradient(circle at 32% 70%, #d4626a, transparent 28%), conic-gradient(from 250deg, #0f0a24, #6b3fa0, #8a7eb8, #1e1240, #0f0a24); }
.mesh-future { background: radial-gradient(circle at 30% 25%, #a78bfa, transparent 25%), radial-gradient(circle at 80% 65%, #ff7b54, transparent 22%), radial-gradient(circle at 42% 80%, #6b3fa0, transparent 31%), conic-gradient(from 310deg, #0f0a24, #6b3fa0, #d4626a, #1e1240); }

.margin-note {
  position: absolute;
  z-index: 4;
  max-width: 210px;
  font-family: "Caveat", cursive;
  font-size: clamp(0.85rem, 1.5vw, 1.1rem);
  line-height: 1.15;
  color: #c4957a;
  opacity: 0.82;
  transform: rotate(4deg);
}
.note-a { left: 54%; top: 4vh; }
.note-b { right: 56%; top: 14vh; transform: rotate(-5deg); }
.note-c { left: 57%; top: 9vh; }
.note-d { right: 58%; top: 18vh; transform: rotate(-3deg); }
.note-e { left: 55%; top: 8vh; transform: rotate(5deg); }

.era-dots {
  position: fixed;
  right: 22px;
  top: 50%;
  z-index: 20;
  display: grid;
  gap: 14px;
  transform: translateY(-50%);
  padding: 14px 10px;
  border-radius: 999px;
  background: rgba(30, 18, 64, 0.7);
  backdrop-filter: blur(4px);
}

.era-dot {
  position: relative;
  width: 12px;
  height: 12px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: rgba(138, 126, 184, 0.58);
  cursor: pointer;
  transition: transform 240ms ease, background 240ms ease, box-shadow 240ms ease;
}
.era-dot span {
  position: absolute;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #8a7eb8;
  opacity: 0;
  transition: opacity 220ms ease;
}
.era-dot:hover span, .era-dot.active span { opacity: 1; }
.era-dot.active { transform: scale(1.35); background: #a78bfa; box-shadow: 0 0 12px rgba(167, 139, 250, 0.5); }

.debris-field { position: absolute; inset: 0; z-index: 3; pointer-events: none; overflow: hidden; transform: translateY(calc(var(--scroll-y) * -0.5)); }
.floater { position: absolute; pointer-events: none; opacity: var(--o); animation: floatDrift var(--d) ease-in-out infinite; animation-delay: var(--delay); }
.bubble { width: var(--s); height: var(--s); border-radius: 50%; background: radial-gradient(circle at 30% 25%, rgba(232, 224, 212, 0.24), rgba(255, 123, 84, 0.18), rgba(107, 63, 160, 0.1)); border: 1px solid rgba(232, 168, 124, 0.18); backdrop-filter: blur(8px); }
.glyph { font-family: "Cormorant Garamond", Georgia, serif; font-size: var(--s); color: #e8a87c; }
.particle { font-family: "IBM Plex Mono", monospace; font-size: 10px; letter-spacing: 0.08em; color: #8a7eb8; }

.ripple-ring {
  position: absolute;
  width: 42px;
  height: 42px;
  margin: -21px 0 0 -21px;
  border: 1.5px solid var(--ring-color);
  border-radius: 50%;
  pointer-events: none;
  animation: rippleBloom 800ms ease-out forwards;
  z-index: 8;
}

@keyframes rippleBloom {
  0% { transform: scale(0); opacity: 1; filter: blur(0); }
  100% { transform: scale(4); opacity: 0; filter: blur(4px); }
}

@keyframes floatDrift {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-15px) rotate(12deg); }
}

@media (max-width: 850px) {
  .time-voyage { padding-left: 7vw; padding-right: 7vw; }
  .spine { left: 8vw; }
  .timeline-card.wide, .timeline-card.narrow { width: calc(100% - 12vw); margin-left: 12vw; margin-right: 0; }
  .timeline-card.left, .timeline-card.right { transform: translateX(28px) rotate(var(--tilt)); }
  .timeline-card.left.revealed, .timeline-card.right.revealed { transform: translateX(0) rotate(var(--tilt)); }
  .left .node-dot, .right .node-dot { left: calc(-12vw - 8px); right: auto; }
  .margin-note { display: none; }
  .era-dots { right: 10px; }
  .era-dot span { display: none; }
}