:root {
  --ink: #18201e;
  --paper: #eee9dc;
  --paper-light: #f6f2e7;
  --red: #9e4138;
  --gold: #b58d4e;
  --green: #24332f;
  --progress: 0;
  --page-gutter: clamp(20px, 4vw, 48px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--paper); }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Arial, Helvetica, sans-serif;
  overflow-x: clip;
}

.skip {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  color: #fff;
  background: var(--green);
  transform: translateY(-160%);
  transition: transform 180ms ease;
}
.skip:focus { transform: none; }

.welcome-header {
  position: fixed;
  z-index: 20;
  top: 0;
  right: 0;
  left: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 78px;
  padding: 8px clamp(22px, 4vw, 68px);
  border-bottom: 1px solid rgba(31, 39, 36, .12);
  background: rgba(244, 240, 229, .72);
  backdrop-filter: blur(12px);
  opacity: 1;
  transition: opacity 360ms ease, background-color 360ms ease, box-shadow 360ms ease;
}
.welcome-header.is-muted {
  opacity: .1;
  background: rgba(244, 240, 229, .38);
  box-shadow: none;
}
.welcome-header img { width: clamp(240px, 30vw, 410px); max-height: 58px; object-fit: contain; object-position: left; }
.welcome-header p { margin: 0; color: #74756d; letter-spacing: .08em; font: italic 10px Georgia, serif; }
.welcome-header p span { color: var(--red); text-transform: uppercase; font: 700 9px Arial, sans-serif; }

.story {
  position: relative;
  width: 100vw;
  min-height: 500svh;
  overflow-x: clip;
}
.stage {
  position: sticky;
  z-index: 1;
  top: 0;
  width: 100%;
  height: 100svh;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 48%, rgba(255,255,255,.82), transparent 42%),
    linear-gradient(135deg, var(--paper-light), #e8e0cf);
}
.paper-noise {
  position: absolute;
  inset: 0;
  opacity: .25;
  background-image:
    repeating-radial-gradient(circle at 23% 31%, rgba(74,61,40,.045) 0 1px, transparent 1px 5px),
    linear-gradient(90deg, transparent 49.8%, rgba(77,65,44,.035) 50%, transparent 50.2%);
  background-size: 9px 9px, 48px 48px;
  mix-blend-mode: multiply;
}
.cartography-grid {
  position: absolute;
  inset: 8% 6%;
  opacity: .12;
  border: 1px solid rgba(79, 66, 43, .24);
  border-radius: 50%;
  background-image:
    linear-gradient(rgba(79,66,43,.13) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79,66,43,.13) 1px, transparent 1px);
  background-size: 7vw 7vw;
  transform: scale(calc(.82 + var(--progress) * .24)) rotate(calc((var(--progress) - .5) * 3deg));
}
.clock-face {
  position: absolute;
  top: 50%;
  left: 50%;
  width: min(66vw, 690px);
  aspect-ratio: 1;
  border: 1px solid rgba(181,141,78,.22);
  border-radius: 50%;
  transform: translate(-50%, -50%) rotate(calc(var(--progress) * 120deg));
}
.clock-face::before,
.clock-face::after {
  content: "";
  position: absolute;
  inset: 8%;
  border: 1px dashed rgba(181,141,78,.18);
  border-radius: inherit;
}
.clock-face::after { inset: 31%; border-style: solid; }
.clock-face i,
.clock-face b {
  position: absolute;
  left: 50%;
  bottom: 50%;
  width: 1px;
  height: 35%;
  background: rgba(158,65,56,.5);
  transform-origin: bottom;
}
.clock-face i { transform: rotate(calc(25deg + var(--progress) * 145deg)); }
.clock-face b { height: 24%; background: rgba(181,141,78,.7); transform: rotate(calc(-45deg + var(--progress) * 260deg)); }

.layer {
  position: absolute;
  left: 50%;
  max-width: none;
  height: auto;
  pointer-events: none;
  filter: sepia(.08) saturate(.86) contrast(.98);
  will-change: transform, opacity;
}
.layer-map { top: 19%; width: min(76vw, 1180px); opacity: 0; transform: translate3d(-50%, 11vh, 0) scale(.82); }
.layer-navigation { top: 21%; width: min(70vw, 1040px); opacity: 0; transform: translate3d(-56%, 16vh, 0) scale(.9); }
.layer-documents { top: 17%; width: min(64vw, 920px); opacity: 0; transform: translate3d(-43%, 20vh, 0) rotate(-3deg) scale(.86); }

.chronology-line {
  position: absolute;
  right: 12%;
  bottom: 17%;
  left: 12%;
  height: 1px;
  background: rgba(31,39,36,.18);
  transform: scaleX(0);
  opacity: 0;
  transition: opacity 160ms linear;
}
.chronology-line span { display: block; width: 100%; height: 2px; background: var(--gold); transform-origin: left; }
.edge-year {
  position: absolute;
  bottom: 12.7%;
  opacity: 0;
  color: rgba(24,32,30,.7);
  font: 24px Georgia, serif;
}
.year-start { left: 10%; }
.year-end { right: 10%; }

.story-copy { position: relative; z-index: 4; width: 100%; margin-top: -100svh; }
.beat {
  display: flex;
  flex-direction: column;
  justify-content: center;
  width: min(620px, calc(100% - 48px));
  min-height: 100svh;
  margin-left: clamp(26px, 9vw, 150px);
  padding: 110px 0 70px;
  opacity: .08;
  transform: translateY(24px);
  transition: opacity 360ms ease, transform 420ms ease;
  pointer-events: none;
}
.beat:nth-child(even):not(.beat-menu) { margin-right: clamp(26px, 9vw, 150px); margin-left: auto; }
.beat.is-active { opacity: 1; transform: none; }
.beat .kicker { margin: 0 0 18px; color: var(--red); text-transform: uppercase; letter-spacing: .2em; font-size: 10px; font-weight: 700; }
.beat h1,
.beat h2 { margin: 0; max-width: 760px; font-family: Georgia, "Times New Roman", serif; font-weight: 400; }
.beat h1 { font-size: clamp(52px, 8vw, 112px); line-height: .88; letter-spacing: -.055em; }
.beat h2 { font-size: clamp(36px, 5vw, 74px); line-height: .98; letter-spacing: -.035em; }
.beat > p:not(.kicker), .portal-heading > p:not(.kicker) { max-width: 590px; margin: 28px 0 0; color: #575a54; font: clamp(17px, 1.35vw, 21px)/1.65 Georgia, serif; }
.scroll-cue { margin-top: 42px; color: #8d7854; text-transform: uppercase; letter-spacing: .18em; font-size: 8px; }
.scroll-cue::after { content: "↓"; margin-left: 12px; color: var(--gold); font-size: 14px; }

.beat-menu {
  width: min(1200px, calc(100% - 48px));
  margin: 0 auto;
  align-items: center;
  text-align: center;
  pointer-events: auto;
}
.portal-heading > p { margin-right: auto !important; margin-left: auto !important; }
.portal-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  width: 100%;
  margin-top: clamp(32px, 6vh, 68px);
  border-top: 1px solid rgba(24,32,30,.22);
  border-bottom: 1px solid rgba(24,32,30,.22);
}
.portal-card {
  position: relative;
  min-height: 190px;
  padding: 24px 18px;
  color: var(--ink);
  border-right: 1px solid rgba(24,32,30,.16);
  text-align: left;
  text-decoration: none;
  transition: color 220ms ease, background 220ms ease, transform 220ms ease;
}
.portal-card:last-child { border-right: 0; }
.portal-card small { color: var(--gold); font: 12px Georgia, serif; }
.portal-card strong { display: block; margin-top: 34px; font: 400 22px/1.05 Georgia, serif; }
.portal-card span { display: block; margin-top: 10px; color: #73766f; font-size: 10px; line-height: 1.45; }
.portal-card em { position: absolute; bottom: 14px; left: 18px; color: #9c8570; text-transform: uppercase; letter-spacing: .12em; font-size: 7px; font-style: normal; }
.portal-card:hover,
.portal-card:focus-visible { z-index: 1; color: #f3eee2; outline: 0; background: var(--green); transform: translateY(-5px); }
.portal-card:hover span,
.portal-card:focus-visible span { color: #abb4b0; }
.portal-card-primary { background: rgba(181,141,78,.09); }
.copyright { margin: 28px 0 0; color: #8b8e87; letter-spacing: .1em; font-size: 8px; }

.progress {
  position: fixed;
  z-index: 30;
  right: 0;
  bottom: 0;
  left: 0;
  height: 2px;
  background: rgba(24,32,30,.08);
}
.progress span { display: block; width: 100%; height: 100%; background: var(--gold); transform: scaleX(var(--progress)); transform-origin: left; }

@media (max-width: 1100px) {
  .welcome-header { min-height: 68px; padding-inline: var(--page-gutter); }
  .welcome-header img { width: min(69vw, 340px); max-height: 52px; }
  .welcome-header p { display: none; }
  .story { min-height: 500svh; }
  .clock-face { width: 98vw; }
  /* Las capas caben completas en el viewport y permanecen centradas. */
  .layer-map { top: 27%; width: min(96vw, 980px); }
  .layer-navigation { top: 31%; width: min(94vw, 940px); }
  .layer-documents { top: 25%; width: min(96vw, 900px); }
  .beat,
  .beat:nth-child(even):not(.beat-menu) {
    justify-content: flex-start;
    width: calc(100% - (2 * var(--page-gutter)));
    max-width: none;
    margin-inline: var(--page-gutter);
    padding-top: 116px;
    text-align: left;
  }
  .beat h1 { max-width: 100%; font-size: clamp(52px, 8.2vw, 82px); }
  .beat h2 { max-width: 100%; font-size: clamp(40px, 6.2vw, 64px); }
  .beat > p:not(.kicker), .portal-heading > p:not(.kicker) { font-size: 16px; line-height: 1.55; }
  .beat-menu { justify-content: center; padding-top: 92px; text-align: center; }
  .portal-grid { grid-template-columns: 1fr 1fr; margin-top: 28px; }
  .portal-card { min-height: 132px; padding: 14px; border-bottom: 1px solid rgba(24,32,30,.16); }
  .portal-card:nth-child(even) { border-right: 0; }
  .portal-card:last-child { grid-column: 1 / -1; }
  .portal-card strong { margin-top: 16px; font-size: 18px; }
  .portal-card span { font-size: 9px; }
  .portal-card em { display: none; }
}

@media (max-width: 600px) {
  :root { --page-gutter: clamp(20px, 5.5vw, 26px); }
  .beat h1 {
    font-size: clamp(42px, 11vw, 58px);
    line-height: .92;
    letter-spacing: -.045em;
  }
  .beat h2 {
    font-size: clamp(36px, 9.5vw, 50px);
    line-height: 1;
  }
  .beat > p:not(.kicker),
  .portal-heading > p:not(.kicker) {
    max-width: 100%;
    font-size: clamp(15px, 4.15vw, 17px);
  }
  .layer-map,
  .layer-navigation,
  .layer-documents { width: 96vw; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .clock-face, .cartography-grid, .layer, .chronology-line, .edge-year { transition: none !important; }
  .layer-map { opacity: .3 !important; transform: translate3d(-50%, 8vh, 0) scale(1) !important; }
  .layer-navigation, .layer-documents { display: none; }
  .beat { transition: none; }
  .welcome-header { transition: none; }
}