@font-face {
  font-family: 'Frutiger';
  src: url('/assets/Frutiger.ttf') format('truetype');
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: 'Frutiger';
  src: url('/assets/Frutiger_bold.ttf') format('truetype');
  font-style: normal;
  font-weight: 700;
  font-display: swap;
}

:root {
  --bg: #f2f0e9;
  --ink: #171a17;
  --muted: #6e736c;
  --line: #c9cec5;
  --card: #fbfaf6;
  --accent: #2e5639;
  --accent-soft: #dce6dc;
  --shadow: 0 10px 30px rgba(20, 30, 20, .07);
  --header-height: 70px;
  --left-column: clamp(220px, 29vw, 430px);
  --axis-width: 68px;
  --page-gutter: clamp(22px, 3vw, 48px);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  font-family: 'Frutiger' !important;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  overflow-x: hidden;
  color: var(--ink);
  font-family: 'Frutiger';
  background:
    linear-gradient(rgba(46, 86, 57, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46, 86, 57, .035) 1px, transparent 1px),
    var(--bg);
  background-size: 32px 32px;
}

button,
a { font: inherit; }

img { max-width: 100%; }

[hidden] { display: none !important; }

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 10px 14px;
  transform: translateY(-140%);
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
}

.skip-link:focus { transform: translateY(0); }

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  padding: 14px var(--page-gutter);
  border-bottom: 1px solid rgba(201, 206, 197, .86);
  background: rgba(242, 240, 233, .9);
  backdrop-filter: blur(14px);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-decoration: none;
  text-transform: uppercase;
}

.back-arrow {
  display: inline-block;
  font-family: inherit;
  font-size: 1rem;
  line-height: 1;
}

.back-link:hover,
.back-link:focus-visible {
  text-decoration: underline;
  text-underline-offset: 4px;
  outline: none;
}

.timeline-status {
  display: flex;
  align-items: baseline;
  gap: 8px;
  min-width: 0;
  font-size: .74rem;
}

.timeline-status span {
  color: var(--muted);
  letter-spacing: .08em;
  text-transform: uppercase;
}

.timeline-status strong {
  max-width: min(48vw, 520px);
  overflow: hidden;
  color: var(--accent);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.timeline-app { min-height: 100svh; }

.loading-state,
.error-state {
  display: grid;
  place-items: center;
  align-content: center;
  min-height: 100svh;
  margin: 0;
  padding: 24px;
  color: var(--muted);
  text-align: center;
}

.loading-mark {
  width: 26px;
  height: 26px;
  border: 2px solid var(--line);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 800ms linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.timeline-world {
  position: relative;
  width: 100%;
  min-height: 100svh;
  isolation: isolate;
}

.events-layer,
.timeline-axis-layer,
.periods-layer {
  position: absolute;
  top: 0;
  bottom: 0;
}

.events-layer {
  left: var(--page-gutter);
  width: calc(var(--left-column) - var(--page-gutter));
  z-index: 6;
}

.timeline-axis-layer {
  left: var(--left-column);
  width: var(--axis-width);
  z-index: 7;
  -webkit-mask-image: linear-gradient(to bottom, #000 0, #000 calc(100% - 350px), transparent calc(100% - 170px), transparent 100%);
  mask-image: linear-gradient(to bottom, #000 0, #000 calc(100% - 350px), transparent calc(100% - 170px), transparent 100%);
}

.periods-layer {
  left: calc(var(--left-column) + var(--axis-width));
  right: var(--page-gutter);
  z-index: 3;
}

.axis-line {
  position: absolute;
  left: 0;
  width: 2px;
  background: var(--accent);
}

.axis-tick {
  position: absolute;
  left: 0;
  display: block;
  height: 1px;
  transform: translateY(-50%);
  background: var(--accent);
}

.axis-tick-year {
  width: 5px;
  opacity: .55;
}

.axis-tick-minor { width: 11px; }

.axis-tick-major {
  width: 22px;
  height: 2px;
}

.axis-tick-boundary {
  width: 22px;
  height: 2px;
}

.axis-year {
  position: absolute;
  top: 50%;
  left: 29px;
  transform: translateY(-50%);
  color: var(--muted);
  font-size: .64rem;
  font-weight: 500;
  white-space: nowrap;
}

.axis-tick-major .axis-year,
.axis-tick-boundary .axis-year {
  color: var(--accent);
  font-size: .72rem;
  font-weight: 700;
}

.event-card {
  position: absolute;
  right: 20px;
  width: min(310px, calc(100% - 22px));
  padding: 12px 14px;
  transform: translateY(-50%);
  border: 1px solid var(--line);
  border-radius: 11px;
  background: rgba(251, 250, 246, .95);
  box-shadow: var(--shadow);
}

.event-card::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 100%;
  width: 22px;
  height: 1px;
  background: var(--accent);
}

.event-date {
  display: block;
  margin-bottom: 3px;
  color: var(--accent);
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .09em;
  text-transform: uppercase;
}

.event-title {
  display: block;
  font-size: .88rem;
  font-weight: 700;
  line-height: 1.2;
}

.event-summary {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: .74rem;
  line-height: 1.4;
}

.event-link {
  color: inherit;
  text-decoration: none;
}

.event-link:hover .event-title,
.event-link:focus-visible .event-title {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.period-range {
  --period-accent: var(--accent);
  position: absolute;
  left: 0;
  right: 0;
  padding-left: 28px;
  overflow: clip;
  background: linear-gradient(90deg, color-mix(in srgb, var(--period-accent) 5%, transparent), transparent 66%);
}

.prologue-content {
  position: sticky;
  bottom: 0;
  z-index: 4;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  width: 100%;
  height: calc(100svh - var(--header-height));
  padding: 18px 0 24px;
}

.prologue-title {
  width: min(100%, 1080px);
  margin: 0;
  font-size: clamp(2.625rem, 6vw, 6.375rem);
  line-height: .86;
  letter-spacing: -.065em;
}

.prologue-summary {
  max-width: 760px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: clamp(.9rem, 1.2vw, 1.08rem);
  line-height: 1.5;
}

.prologue-content .video-block {
  align-self: flex-start;
  width: 80%;
  margin: 20px 0 0;
  padding: 0;
  line-height: 0;
}

.prologue-content .period-video {
  display: block;
  height: auto;
  max-height: none;
  margin: 0;
  padding: 0;
  vertical-align: top;
  border-radius: 0;
  background: transparent;
}

.period-card {
  position: sticky;
  top: calc(var(--header-height) + 25px);
  padding: 20px;
  overflow: visible;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(251, 250, 246, .95);
  box-shadow: var(--shadow);
}

.period-range-static {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 24px;
  padding-bottom: 40px;
  background: none;
}

.period-card-static {
  position: relative;
  top: auto;
  width: 100%;
}

.period-eyebrow {
  margin: 0 0 7px;
  color: var(--period-accent);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.period-title {
  max-width: 1000px;
  margin: 0;
  font-size: clamp(2.25rem, 4.4vw, 5rem);
  line-height: .93;
  letter-spacing: -.055em;
}

.period-intro {
  max-width: 760px;
  margin: 13px 0 0;
  color: var(--muted);
  font-size: clamp(.84rem, 1.05vw, .98rem);
  line-height: 1.5;
}

.scale-note {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin: 14px 0 0;
  color: var(--period-accent);
  font-size: .7rem;
  font-weight: 600;
}

.scale-note::before {
  content: '';
  width: 22px;
  height: 1px;
  background: currentColor;
}

.content-grid {
  --column-count: 1;
  display: grid;
  grid-template-columns: repeat(var(--column-count), minmax(0, 1fr));
  gap: 12px;
  margin-top: 25px;
  padding: 1px 1px 10px;
  overflow: visible;
}

.content-column {
  min-width: 0;
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: rgba(251, 250, 246, .92);
}

.column-heading {
  margin: 0 0 12px;
  padding-bottom: 9px;
  border-bottom: 1px solid var(--line);
  font-size: .74rem;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.text-block p {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: .78rem;
  line-height: 1.48;
}

.text-block p:last-child { margin-bottom: 0; }

.image-block { margin: 0; }

.image-block img,
.period-video {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  max-height: min(28svh, 240px);
  object-fit: contain;
  border-radius: 9px;
  background: var(--accent-soft);
}

.period-video { aspect-ratio: 16 / 9; }

.image-block figcaption {
  margin-top: 8px;
  color: var(--muted);
  font-size: .68rem;
  line-height: 1.35;
}

.document-block {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) auto;
  gap: 10px;
  align-items: start;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--card);
  color: inherit;
  text-decoration: none;
  transition: border-color 160ms ease, transform 160ms ease, box-shadow 160ms ease;
}

.document-block:hover,
.document-block:focus-visible {
  transform: translateY(-2px);
  border-color: var(--period-accent);
  box-shadow: 0 9px 22px rgba(20, 30, 20, .09);
  outline: none;
}

.document-favicon,
.document-fallback {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 7px;
  background: var(--accent-soft);
}

.document-favicon {
  padding: 5px;
  object-fit: contain;
}

.document-fallback {
  color: var(--period-accent);
  font-size: .78rem;
  font-weight: 700;
}

.document-copy strong {
  display: block;
  font-size: .75rem;
  line-height: 1.3;
}

.document-copy span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: .68rem;
  line-height: 1.35;
}

.document-arrow {
  color: var(--period-accent);
  font-size: 1rem;
}

.period-navigation {
  position: fixed;
  right: var(--page-gutter);
  bottom: 18px;
  left: calc(var(--left-column) + var(--axis-width) + 28px);
  z-index: 20;
  display: flex;
  gap: 10px;
  align-items: stretch;
  width: min(920px, calc(100% - var(--left-column) - var(--axis-width) - 72px));
  margin: 0 auto;
  pointer-events: none;
}

.period-navigation[hidden] { display: none; }

.global-jump {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  flex: 0 1 calc((100% - 106px) / 2);
  width: calc((100% - 106px) / 2);
  min-width: 0;
  padding: 10px 12px 10px 16px;
  border: 1px solid var(--accent);
  border-radius: 999px;
  background: rgba(251, 250, 246, .96);
  color: var(--ink);
  text-align: left;
  box-shadow: 0 14px 38px rgba(20, 30, 20, .14);
  cursor: pointer;
  pointer-events: auto;
}

.global-jump-previous {
  grid-template-columns: auto minmax(0, 1fr);
  padding: 10px 16px 10px 12px;
}

.jump-kicker {
  display: block;
  color: var(--accent);
  font-size: .6rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.jump-label {
  display: block;
  margin-top: 2px;
  overflow: hidden;
  font-size: .78rem;
  font-weight: 650;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.jump-arrow {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  transition: transform 160ms ease;
}

.global-jump:hover .jump-arrow,
.global-jump:focus-visible .jump-arrow { transform: translateY(3px); }

.global-jump-previous:hover .jump-arrow,
.global-jump-previous:focus-visible .jump-arrow { transform: translateY(-3px); }

.global-jump:focus-visible {
  outline: 3px solid rgba(46, 86, 57, .23);
  outline-offset: 3px;
}

.edge-jump {
  flex: 0 0 38px;
  align-self: center;
  width: 38px;
  height: 38px;
  padding: 0;
  border: 1px solid var(--accent);
  border-radius: 50%;
  background: rgba(251, 250, 246, .96);
  color: var(--accent);
  font: inherit;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1;
  box-shadow: 0 10px 28px rgba(20, 30, 20, .14);
  cursor: pointer;
  pointer-events: auto;
  transition: transform 160ms ease, background-color 160ms ease, color 160ms ease;
}

.initial-jump { margin-left: auto; }

.edge-jump:hover,
.edge-jump:focus-visible {
  background: var(--accent);
  color: #fff;
  outline: none;
}

.initial-jump:hover,
.initial-jump:focus-visible { transform: translateY(-2px); }

.final-jump:hover,
.final-jump:focus-visible { transform: translateY(2px); }

.edge-jump:focus-visible {
  box-shadow: 0 0 0 3px rgba(46, 86, 57, .23), 0 10px 28px rgba(20, 30, 20, .14);
}

.post-timeline {
  position: relative;
  z-index: 10;
  padding: clamp(36px, 5vw, 70px) var(--page-gutter) clamp(70px, 10vw, 140px);
  border-top: 1px solid var(--line);
  background: var(--bg);
}

.post-timeline-inner {
  width: min(1180px, 100%);
  margin: 0 auto;
}

.post-timeline .section-kicker {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.post-timeline h2 {
  max-width: 1000px;
  margin: 0;
  font-size: clamp(2.5rem, 6vw, 5.6rem);
  line-height: .94;
  letter-spacing: -.05em;
}

.fieldwork-section h2 {
  max-width: 820px;
  font-size: clamp(1.9rem, 4vw, 3.8rem);
  line-height: 1;
}

.fieldwork-description {
  max-width: 720px;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: clamp(.82rem, 1.05vw, .98rem);
  line-height: 1.55;
}

.youtube-frame {
  width: 100%;
  aspect-ratio: 16 / 9;
  margin-top: 30px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #101310;
  box-shadow: var(--shadow);
}

.youtube-frame iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

.event-card {
  z-index: 1;
  transition:
    z-index 0s,
    transform 140ms ease,
    box-shadow 140ms ease;
}

.event-card:hover,
.event-card:focus-within {
  z-index: 100;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.18);
}

@media (max-width: 920px) {
  :root {
    --left-column: 27vw;
    --axis-width: 52px;
  }

  .period-title { font-size: clamp(2rem, 5.6vw, 3.6rem); }

  .content-grid {
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
    overflow: visible;
  }
}

@media (max-width: 620px) {
  :root {
    --header-height: 62px;
    --left-column: 28vw;
    --axis-width: 34px;
    --page-gutter: 9px;
  }

  .site-header { padding: 11px 12px; }

  .back-link { font-size: .64rem; }

  .timeline-status {
    display: block;
    max-width: 48vw;
    text-align: right;
  }

  .timeline-status span { display: none; }

  .timeline-status strong {
    display: block;
    max-width: 48vw;
    font-size: .66rem;
  }

  .axis-tick-minor { width: 7px; }

  .axis-tick-major,
  .axis-tick-boundary { width: 13px; }

  .axis-year {
    left: 16px;
    font-size: .53rem;
  }

  .axis-tick-major .axis-year,
  .axis-tick-boundary .axis-year { font-size: .6rem; }

  .event-card {
    right: 8px;
    width: calc(100% - 8px);
    padding: 8px;
    border-radius: 8px;
  }

  .event-card::after { width: 10px; }

  .event-date { font-size: .55rem; }

  .event-title { font-size: .65rem; }

  .event-summary { display: none; }

  .period-range { padding-left: 8px; }

  .prologue-content {
    bottom: 0;
    height: calc(100svh - var(--header-height));
    padding: 12px 0 18px;
  }

  .prologue-title { font-size: clamp(1.8rem, 9vw, 3rem); }

  .prologue-content .video-block { margin-top: 20px; }

  .period-card {
    top: calc(var(--header-height) + 16px);
    padding: 12px;
    border-radius: 11px;
  }

  .period-eyebrow { font-size: .56rem; }

  .period-title {
    font-size: clamp(1.45rem, 7.6vw, 2.2rem);
    line-height: .96;
  }

  .period-intro {
    margin-top: 8px;
    font-size: .7rem;
    line-height: 1.4;
  }

  .scale-note {
    margin-top: 9px;
    font-size: .56rem;
  }

  .content-grid {
    grid-template-columns: 1fr;
    gap: 9px;
    margin-top: 15px;
  }

  .content-column {
    padding: 11px;
    border-radius: 9px;
  }

  .column-heading { font-size: .63rem; }

  .text-block p { font-size: .7rem; }

  .period-navigation {
    right: 9px;
    bottom: 10px;
    left: calc(var(--left-column) + var(--axis-width) + 8px);
    width: auto;
    gap: 6px;
  }

  .global-jump {
    flex-basis: calc((100% - 82px) / 2);
    width: calc((100% - 82px) / 2);
    padding: 8px 8px 8px 11px;
  }

  .global-jump-previous { padding: 8px 11px 8px 8px; }

  .global-jump-previous .jump-label,
  .global-jump-previous .jump-kicker {
    text-align: right;
  }

  .jump-label { font-size: .65rem; }

  .jump-arrow {
    width: 30px;
    height: 30px;
  }

  .edge-jump {
    flex-basis: 32px;
    width: 32px;
    height: 32px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
  }
}