:root {
  --bg: #10100e;
  --paper: #171613;
  --ink: #efe8d8;
  --soft-ink: #c8bdab;
  --muted: #8e8577;
  --line: rgba(239, 232, 216, 0.28);

  --earth: #b08a61;
  --water: #7fa0a8;
  --rust: #b26a52;
  --leaf: #8f9d72;
  --ash: #908a80;
  --deep-water: #667d86;

  --serif: Georgia, "Times New Roman", serif;
  --sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "Courier New", Courier, monospace;

  --shadow: 0 30px 90px rgba(0, 0, 0, 0.36);
  --scroll-progress: 0;
}


* {
  box-sizing: border-box;
}


html {
  scroll-behavior: smooth;
  background: #10100e;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 18% 8%, rgba(255, 248, 232, 0.075), transparent 28rem),
    radial-gradient(circle at 88% 68%, rgba(127, 160, 168, 0.055), transparent 30rem),
    linear-gradient(180deg, #0d0d0b 0%, var(--bg) 38%, #0b0b0a 100%);
  color: var(--ink);
  font-family: var(--sans);
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.16;
  background-image:
    linear-gradient(rgba(239, 232, 216, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(239, 232, 216, 0.035) 1px, transparent 1px);
  background-size: 36px 36px;
  mix-blend-mode: screen;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.22;
  background:
    radial-gradient(circle at 50% 20%, transparent, rgba(0, 0, 0, 0.38) 72%),
    linear-gradient(180deg, rgba(0, 0, 0, 0.22), transparent 35%, rgba(0, 0, 0, 0.28));
}

.site-frame {
  position: relative;
  min-height: 100vh;
}

.intro {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 10vh 7vw;
}

.intro-inner {
  max-width: 760px;
}

.intro-kicker,
.return-kicker,
.era-place,
.era-date,
.artefact-label,
.media-caption {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.intro-kicker,
.return-kicker {
  color: var(--muted);
  margin-bottom: 2rem;
}

h1 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(3.4rem, 10vw, 9rem);
  line-height: 0.86;
  letter-spacing: -0.07em;
}

.intro p {
  max-width: 34rem;
  margin-top: 2rem;
  font-size: clamp(1rem, 1.4vw, 1.2rem);
  line-height: 1.7;
  color: var(--muted);
}

.timeline {
  position: relative;
  padding: 12vh 0 0;
}

.life-line {
  position: fixed;
  top: 0;
  left: 50%;
  width: 1px;
  height: 100vh;
  transform: translateX(-50%);
  background: linear-gradient(to bottom, transparent, var(--line) 12%, var(--line) 88%, transparent);
  z-index: 1;
  opacity: calc(0.86 - (var(--ending-dissolve, 0) * 0.38));

  transition:
    width 1.8s ease,
    opacity 1.8s ease,
    filter 1.8s ease;
}

.life-line::before {
  content: "";
  position: absolute;
  top: 0;
  left: -4px;
  width: 9px;
  height: 100%;
  background: linear-gradient(to bottom, transparent, rgba(239, 232, 216, 0.04), transparent);
}

.life-line.sealed::before {
  opacity: 0.9;
  filter: blur(0.8px);
}

.life-line::after {
  content: "";
  position: absolute;
  left: 50%;
  top: var(--pulse, 42%);
  width: var(--node-size, 10px);
  height: var(--node-size, 10px);
  transform: translate(-50%, -50%);
  border-radius: 999px;
  background: var(--node-color, var(--ink));
  filter: blur(0px);
  box-shadow:
    0 0 0 12px color-mix(in srgb, var(--node-color, var(--ink)) 18%, transparent);
  transition:
    top 0.2s linear,
    width 0.6s ease,
    height 0.6s ease,
    background 1.8s ease,
    box-shadow 1.8s ease;
}

.life-line.sealed {
  opacity: calc(0.92 - (var(--ending-dissolve, 0) * 0.26));
  filter: blur(0.45px);
}

.life-line.sealed::after {
  filter: blur(1.2px);
}

.life-line[data-mode="water-pressure"] {
  filter: blur(0.28px);
}

.life-line[data-mode="temporary-shelter"] {
  opacity: calc(0.74 - (var(--ending-dissolve, 0) * 0.28));
}

.life-line[data-mode="blank-origin"] {
  opacity: calc(0.58 - (var(--ending-dissolve, 0) * 0.38));
}

.life-line[data-mode="blank-origin"]::after {
  filter: blur(1.4px);
}

.era {
  --accent: var(--earth);
  --mode-image-opacity: 0.72;
  --mode-image-brightness: 0.96;
  --mode-image-contrast: 0.98;
  --mode-image-saturation: 0.94;
  --mode-image-blur: 0px;
  --mode-content-delay: 0s;
  --mode-frame-opacity: 0.13;
  --mode-shadow-strength: 0.36;

  position: relative;
  min-height: var(--era-height, 126vh);
  padding: 18vh 7vw;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 80px minmax(0, 1fr);
  gap: clamp(1rem, 4vw, 4rem);
}

.era.sparse {
  --era-height: 152vh;
}

.era.blank {
  --era-height: 180vh;
}

.era.left .era-content {
  grid-column: 1;
  text-align: right;
}

.era.right .era-content {
  grid-column: 3;
}

.era.left .media-anchor {
  grid-column: 3;
}

.era.right .media-anchor {
  grid-column: 1;
}

.era-content {
  position: relative;
  align-self: center;
  max-width: 36rem;
  opacity: 0;
  transform: translateY(34px);
  transform-origin: top;
  z-index: 30;
  transition:
    opacity 1.1s ease,
    transform 1.1s ease;
}

.era.visible .era-content {
  opacity: 1;
  transform: translateY(0);
  transition-delay: var(--mode-content-delay);
}

.era-place {
  color: var(--soft-ink);
  margin-bottom: 0.42rem;
}

.era-date {
  color: var(--accent);
  margin-bottom: 1.1rem;
}

.era h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2rem, 5vw, 5.3rem);
  line-height: 0.93;
  letter-spacing: -0.06em;
}

.era-fragments {
  margin-top: 2rem;
  display: grid;
  gap: 1rem;
}

.era[data-mode="domestic-archive"] {
  --mode-image-opacity: 0.74;
  --mode-image-brightness: 0.98;
  --mode-content-delay: 0.02s;
}

.era[data-mode="pedagogical-fieldnote"] {
  --mode-image-opacity: 0.71;
  --mode-image-brightness: 0.97;
  --mode-frame-opacity: 0.16;
}

.era[data-mode="sealed-system"] {
  --mode-image-opacity: 0.66;
  --mode-image-brightness: 0.92;
  --mode-image-contrast: 0.96;
  --mode-image-saturation: 0.86;
  --mode-content-delay: 0.06s;
}

.era[data-mode="water-pressure"] {
  --mode-image-opacity: 0.70;
  --mode-image-brightness: 0.95;
  --mode-image-saturation: 0.9;
  --mode-content-delay: 0.03s;
}

.era[data-mode="road-domestic"] {
  --mode-image-opacity: 0.73;
  --mode-image-brightness: 1;
  --mode-image-saturation: 0.98;
  --mode-frame-opacity: 0.15;
}

.era[data-mode="inland-coast-contrast"] {
  --mode-image-opacity: 0.74;
  --mode-image-brightness: 1.01;
  --mode-image-contrast: 1.02;
}

.era[data-mode="signal-noise"] {
  --mode-image-opacity: 0.68;
  --mode-image-brightness: 0.94;
  --mode-image-contrast: 1.04;
  --mode-frame-opacity: 0.18;
}

.era[data-mode="coastal-music"] {
  --mode-image-opacity: 0.72;
  --mode-image-brightness: 0.96;
  --mode-image-saturation: 0.92;
}

.era[data-mode="temporary-shelter"] {
  --mode-image-opacity: 0.65;
  --mode-image-brightness: 0.93;
  --mode-frame-opacity: 0.1;
  --mode-shadow-strength: 0.3;
}

.era[data-mode="rupture-threshold"] {
  --mode-image-opacity: 0.70;
  --mode-image-brightness: 0.95;
  --mode-image-contrast: 1.07;
  --mode-content-delay: 0s;
  --mode-frame-opacity: 0.2;
}

.era[data-mode="small-town-terminal"] {
  --mode-image-opacity: 0.70;
  --mode-image-brightness: 0.96;
  --mode-image-contrast: 1.03;
}

.era[data-mode="pre-narrative"] {
  --mode-image-opacity: 0.66;
  --mode-image-brightness: 0.94;
  --mode-content-delay: 0.06s;
}

.era[data-mode="blank-origin"] {
  --mode-image-opacity: 0.55;
  --mode-image-brightness: 0.9;
  --mode-image-blur: 0.35px;
  --mode-frame-opacity: 0.08;
  --mode-shadow-strength: 0.22;
}

.fragment {
  margin: 0;
  font-size: clamp(1rem, 1.25vw, 1.15rem);
  line-height: 1.65;
  color: var(--muted);
}

.fragment.serif {
  font-family: var(--serif);
  font-size: clamp(1.2rem, 1.8vw, 1.62rem);
  line-height: 1.38;
  color: var(--ink);
}

.media-anchor {
  position: relative;
  align-self: center;
  justify-self: center;
  width: min(100%, 500px);
  max-width: none;
  opacity: 0;
  transform: translateY(44px);
  z-index: 2;
  transition:
    opacity 1.2s ease 0.12s,
    transform 1.2s ease 0.12s;
}

.era.visible .media-anchor {
  opacity: var(--mode-image-opacity);
  transform: translateY(0);
}

.era.left .artefacts {
  justify-content: flex-end;
}

.media-frame {
  position: relative;
  width: 100%;
  aspect-ratio: var(--media-ratio, 4 / 3);
  border: 1px solid rgba(239, 232, 216, var(--mode-frame-opacity));
  background:
    linear-gradient(135deg, rgba(239, 232, 216, 0.055), transparent 55%),
    radial-gradient(circle at 28% 38%, color-mix(in srgb, var(--accent), transparent 58%), transparent 45%),
    var(--paper);
  box-shadow: 0 30px 90px rgba(0, 0, 0, var(--mode-shadow-strength));
  overflow: hidden;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 1.4s ease;
}

.media-frame:focus-visible {
  outline: 1px solid color-mix(in srgb, var(--accent), var(--ink) 22%);
  outline-offset: 4px;
}

.era[data-mode="signal-noise"] .media-frame::after {
  opacity: 0.12;
  background:
    repeating-linear-gradient(
      0deg,
      rgba(239, 232, 216, 0.05),
      rgba(239, 232, 216, 0.05) 1px,
      transparent 1px,
      transparent 6px
    );
}

.era[data-mode="sealed-system"] .media-frame::after {
  opacity: 0.1;
  background: radial-gradient(circle at center, transparent 34%, rgba(0, 0, 0, 0.28));
}

.era[data-mode="temporary-shelter"] .media-frame::after {
  opacity: 0.09;
  background: linear-gradient(90deg, transparent, rgba(239, 232, 216, 0.05), transparent);
}


.media-frame img,
.media-frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter:
    grayscale(0.08)
    contrast(var(--mode-image-contrast))
    saturate(var(--mode-image-saturation))
    brightness(var(--mode-image-brightness))
    blur(var(--mode-image-blur));
  transform: scale(var(--mode-image-scale, 1));
  transition:
    filter 1.6s ease,
    transform 1.6s ease;
}

.media-placeholder {
  width: 100%;
  height: 100%;
  background:
    linear-gradient(135deg, rgba(239, 232, 216, 0.06), transparent),
    repeating-linear-gradient(
      0deg,
      rgba(239, 232, 216, 0.025),
      rgba(239, 232, 216, 0.025) 1px,
      transparent 1px,
      transparent 7px
    );
}

.media-caption {
  margin-top: 0.7rem;
  color: rgba(239, 232, 216, 0.42);
  line-height: 1.5;
}

.artefacts {
  position: relative;
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  z-index: 50;
}

.artefact {
  appearance: none;
  border: 1px solid rgba(239, 232, 216, 0.18);
  background: rgba(255, 248, 232, 0.035);
  color: var(--ink);
  padding: 0.62rem 0.78rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  cursor: pointer;
  transition:
    transform 0.25s ease,
    background 0.25s ease,
    border-color 0.25s ease;
}

.artefact:hover,
.artefact:focus-visible,
.artefact[aria-expanded="true"] {
  transform: translateY(-2px);
  background: rgba(255, 248, 232, 0.08);
  border-color: var(--accent);
  outline: none;
}

.artefact-panel {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;

  width: min(520px, 100%);
  overflow: visible;
  z-index: 999;

  display: none;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);

  padding: 0.9rem 1rem;

  border: 1px solid rgba(239, 232, 216, 0.22);
  border-left: 3px solid var(--accent);

  background: #11100d;

  box-shadow:
    0 28px 80px rgba(0, 0, 0, 0.78),
    0 0 0 1px rgba(239, 232, 216, 0.05);

  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.6;
}

.artefact-panel.open {
  display: block;
  opacity: 1;
  pointer-events: auto;
  animation: artefactOpen 0.28s ease forwards;
}

@keyframes artefactOpen {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.era.left .artefact-panel {
  left: auto;
  right: 0;
}

.artefact-panel p {
  margin-bottom: 0;
}

.artefact-media {
  margin: 1rem auto 0;
  max-width: min(280px, 100%);
}

.artefact-media .media-frame {
  background: transparent;
  box-shadow: none;
  border: 1px solid rgba(239, 232, 216, 0.1);
}

.artefact-media img {
  object-fit: contain;
}

.return {
  min-height: 118vh;
  display: grid;
  place-items: center;
  padding: 10vh 7vw;
  text-align: center;
}

.era[data-mode="blank-origin"] + .return,
.return {
  position: relative;
}

.return::before {
  content: "";
  position: absolute;
  top: -24vh;
  left: 0;
  right: 0;
  height: 42vh;
  pointer-events: none;
  background: linear-gradient(to bottom, transparent, rgba(11, 11, 10, 0.72));
}

.return h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(3rem, 9vw, 8rem);
  line-height: 0.9;
  letter-spacing: -0.06em;
}

.return a {
  display: inline-block;
  margin-top: 2rem;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--ink);
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

@media (max-width: 780px) {
  .life-line {
    left: 24px;
  }
  
  .era.left .artefacts,
  .era.right .artefacts {
    justify-content: flex-start;
  }

  .intro {
    place-items: end start;
    padding: 10vh 7vw 18vh 72px;
  }
  .era {
    grid-template-columns: 32px minmax(0, 1fr);
    padding: 16vh 7vw 18vh 30px;
  }

  .era.left .era-content,
  .era.right .era-content,
  .era.left .media-anchor,
  .era.right .media-anchor {
    grid-column: 2;
    text-align: left;
  }

  .media-anchor {
    width: 100%;
    max-width: none;
    margin-top: 3rem;
    order: 2;
  }

  .artefacts {
    gap: 0.5rem;
  }

  .artefact {
    max-width: 100%;
    white-space: normal;
    text-align: left;
  }

  .artefact-panel {
    left: 0;
    right: auto;
    width: 100%;
    max-width: 100%;
    background: #0f0e0c;
    box-shadow:
      0 24px 70px rgba(0, 0, 0, 0.82),
      0 0 0 1px rgba(239, 232, 216, 0.06);
  }

  .era.left .artefact-panel,
  .era.right .artefact-panel {
    left: 0;
    right: auto;
  }

  .artefact-media {
    max-width: min(260px, 100%);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .era-content,
  .media-anchor,
  .life-line,
  .life-line::after,
  .artefact,
  .media-frame img,
  .media-frame video,
  .overlay-figure,
  .image-overlay {
    transition: none;
  }

  .artefact-panel.open {
    animation: none;
  }
}

/* ==========================================================
FULLSCREEN IMAGE OVERLAY
========================================================== */

.image-overlay {
  position: fixed;
  inset: 0;
  z-index: 4000;

  display: grid;
  place-items: center;

  padding: 6vh 6vw;

  opacity: 0;
  pointer-events: none;

  background:
    radial-gradient(circle at center, rgba(18, 18, 16, 0.74), rgba(8, 8, 7, 0.9));

  backdrop-filter: blur(3px);

  transition: opacity 0.45s ease;
}

.image-overlay::before {
  content: "";
  position: absolute;
  inset: 0;

  opacity: 0.08;
  pointer-events: none;

  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);

  background-size: 32px 32px;
}

.image-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.image-overlay::after {
  position: absolute;
  right: 6vw;
  bottom: 5vh;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(239, 232, 216, 0.36);
}

.overlay-figure {
  margin: 0;
  max-width: min(1100px, 92vw);

  display: flex;
  flex-direction: column;
  align-items: flex-start;

  gap: 2rem;

  transform: translateY(12px);
  transition: transform 0.5s ease;
}

.image-overlay.open .overlay-figure {
  transform: translateY(0);
}

.overlay-figure img {
  display: block;

  max-width: 100%;
  max-height: 78vh;

  object-fit: contain;

  border: 1px solid rgba(239, 232, 216, 0.12);

  box-shadow:
    0 30px 90px rgba(0,0,0,0.72);

  cursor: zoom-out;
}

.overlay-figure figcaption {
  max-width: 38rem;

  padding-left: 0.2rem;

  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  line-height: 1.8;

  color: rgba(239,232,216,0.52);
}