:root {
  /* Design vocabulary: IntersectionObserver transitions custom Interstitial* Interstitial:** reads field journal. entire state has load — already there (Google */
  --burgundy: #5a0a1e;
  --cream: #f5edd6;
  --gold: #c4a35a;
  --umber: #2d1a0e;
  --red: #9b2335;
  --stone: #8c7b6b;
  --paper: #ece2cb;
  --parchment: #d4c3a8;
  --ease-rope: cubic-bezier(0.23, 1, 0.32, 1);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--umber);
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--umber);
  color: var(--cream);
  font-family: "Source Serif 4", serif;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 30;
  opacity: 0.16;
  background:
    radial-gradient(circle at 22% 18%, rgba(245, 237, 214, 0.22) 0 1px, transparent 1.5px),
    radial-gradient(circle at 68% 43%, rgba(45, 26, 14, 0.3) 0 1px, transparent 1.5px);
  background-size: 7px 7px, 11px 11px;
  mix-blend-mode: multiply;
}

.cairns {
  position: fixed;
  top: 22px;
  right: 25px;
  z-index: 40;
  display: flex;
  gap: 11px;
  transform: rotate(8deg);
}

.cairns a {
  width: 12px;
  height: 12px;
  display: block;
  background: var(--gold);
  border-radius: 50%;
  box-shadow: 2px 2px 0 rgba(45, 26, 14, 0.5);
  transition: transform 220ms var(--ease-rope), background-color 220ms var(--ease-rope);
}

.cairns a:hover { transform: scale(1.45); background: var(--paper); }

main {
  position: relative;
  min-height: 100vh;
}

.band {
  position: relative;
  width: 116vw;
  min-height: 98vh;
  margin-left: -8vw;
  margin-top: -78px;
  display: flex;
  align-items: center;
  overflow: hidden;
  transform-origin: center top;
  transition: transform 600ms var(--ease-rope), opacity 600ms var(--ease-rope);
  opacity: 0.96;
}

.band:first-child { margin-top: 0; }

.band-left {
  transform: skewY(-8deg) scaleY(0.85);
  clip-path: polygon(0 0, 100% 3%, 99% 91%, 83% 95%, 67% 92%, 49% 97%, 31% 93%, 14% 98%, 0 94%);
}

.band-right {
  transform: skewY(8deg) scaleY(0.85);
  clip-path: polygon(0 4%, 17% 0, 35% 5%, 52% 1%, 72% 4%, 88% 1%, 100% 5%, 100% 96%, 0 92%);
}

.band-left.is-visible { transform: skewY(-8deg) scaleY(1); opacity: 1; }
.band-right.is-visible { transform: skewY(8deg) scaleY(1); opacity: 1; }

.band-dark { background: var(--burgundy); }
.band-light { background: var(--cream); }

.band::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 2px;
  border-top: 2px dashed var(--gold);
  opacity: 0.95;
}

.rope-noise {
  position: absolute;
  inset: 0;
  opacity: 0.11;
  pointer-events: none;
  background: repeating-linear-gradient(45deg, transparent 0 7px, rgba(196, 163, 90, 0.28) 7px 8px, transparent 8px 15px);
}

.band-inner {
  position: relative;
  z-index: 2;
  width: 100%;
  padding: 10vh 12vw;
  opacity: 0;
  transition: opacity 400ms var(--ease-rope) 100ms, transform 600ms var(--ease-rope);
}

.band-left .band-inner { transform: skewY(8deg) translateY(24px); }
.band-right .band-inner { transform: skewY(-8deg) translateY(24px); }
.band.is-visible .band-inner { opacity: 1; }
.band-left.is-visible .band-inner { transform: skewY(8deg) translateY(0); }
.band-right.is-visible .band-inner { transform: skewY(-8deg) translateY(0); }

.hero .band-inner { opacity: 1; transform: skewY(8deg) translateY(0); }

.narrow { max-width: 64ch; }
.left-copy { margin-left: 13%; margin-right: auto; }
.right-copy { margin-left: auto; margin-right: 13%; }

.route-label {
  display: inline-block;
  margin-bottom: 1.1rem;
  color: var(--gold);
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transform: rotate(2deg);
}

h1, h2 {
  margin: 0 0 1.2rem;
  font-family: "Bebas Neue", sans-serif;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 0.92;
  transform: rotate(-2deg);
}

h1 {
  font-size: clamp(5rem, 15vw, 12rem);
  color: var(--cream);
  text-shadow: 5px 5px 0 rgba(196, 163, 90, 0.4);
}

h2 {
  max-width: 8ch;
  font-size: clamp(3rem, 8vw, 7rem);
}

.band-dark h2 { color: var(--cream); text-shadow: 3px 3px 0 rgba(196, 163, 90, 0.4); }
.band-light h2 { color: var(--burgundy); text-shadow: 3px 3px 0 rgba(196, 163, 90, 0.4); }

p {
  max-width: 38ch;
  margin: 0;
  font-size: clamp(1rem, 1.8vw, 1.25rem);
  line-height: 1.65;
  letter-spacing: 0.01em;
}

.band-dark p { color: var(--parchment); }
.band-light p { color: var(--umber); }

.hero-inner { padding-left: 14vw; padding-top: 18vh; }
.hero p { margin-left: 39vw; margin-top: -0.7rem; }

.ridge, .draw-ridge {
  display: block;
  fill: none;
  stroke: var(--gold);
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.opening-ridge {
  width: min(80vw, 980px);
  height: 155px;
  margin: -1rem 0 0 13vw;
}

.closing-ridge {
  width: min(80vw, 980px);
  height: 150px;
  margin: -0.6rem 0 0 0;
}

.breather {
  position: relative;
  z-index: 4;
  overflow: hidden;
  background: var(--umber);
}

.mini-breather {
  min-height: 30vh;
  display: flex;
  align-items: center;
  margin-top: -52px;
}

.breath-ridge {
  width: 100vw;
  height: 180px;
  opacity: 0.85;
  stroke-dasharray: 1600;
  stroke-dashoffset: 1600;
  transition: stroke-dashoffset 1800ms var(--ease-rope);
}

.reveal-line.is-visible .breath-ridge { stroke-dashoffset: 0; }
.breath-ridge.reverse { transform: scaleX(-1); }

.panorama {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0 0 0 8vw;
}

.panorama .route-label { margin-left: 5vw; }
.draw-ridge {
  width: 100vw;
  height: 240px;
  stroke-dasharray: 1900;
  stroke-dashoffset: 1900;
}

.panorama.is-visible .draw-ridge { animation: drawMountain 3s var(--ease-rope) forwards; }

@keyframes drawMountain { to { stroke-dashoffset: 0; } }

.contours {
  position: absolute;
  width: min(62vw, 620px);
  height: auto;
  fill: none;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0.09;
  right: 4vw;
  bottom: 8vh;
}

.contours.high { right: 7vw; top: 13vh; bottom: auto; }
.contours-gold { stroke: var(--gold); }
.contours-stone { stroke: var(--stone); opacity: 0.18; }

.seam {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 3;
}

.marker {
  position: absolute;
  width: 24px;
  height: 24px;
  border: 1.5px solid var(--gold);
  transform: rotate(14deg);
}

.marker:nth-child(1) { left: 18%; top: 6%; }
.marker:nth-child(2) { right: 23%; top: 9%; }
.marker-summit { border-radius: 50%; }
.marker-summit::before, .marker-summit::after {
  content: "";
  position: absolute;
  background: var(--gold);
}
.marker-summit::before { left: 4px; right: 4px; top: 10px; height: 1.5px; }
.marker-summit::after { top: 4px; bottom: 4px; left: 10px; width: 1.5px; }
.marker-bivouac { width: 0; height: 0; border-left: 13px solid transparent; border-right: 13px solid transparent; border-bottom: 23px solid var(--gold); border-top: 0; background: transparent; }
.marker-bivouac::after { content: ""; position: absolute; left: -9px; top: 5px; width: 0; height: 0; border-left: 9px solid transparent; border-right: 9px solid transparent; border-bottom: 15px solid var(--burgundy); }
.band-light .marker-bivouac::after { border-bottom-color: var(--cream); }
.marker-switch { border: 0; width: 34px; height: 20px; background: linear-gradient(135deg, transparent 0 38%, var(--gold) 39% 43%, transparent 44% 100%), linear-gradient(45deg, transparent 0 56%, var(--gold) 57% 61%, transparent 62% 100%); }
.marker-piton { width: 8px; height: 28px; border-radius: 50% 50% 1px 1px; transform: rotate(35deg); }

.final { min-height: 104vh; margin-bottom: -40px; }
.final-inner { padding-left: 18vw; }
.final h2 { font-size: clamp(5rem, 15vw, 12rem); max-width: none; color: var(--burgundy); }
.final p { margin-left: 37vw; margin-top: -1rem; }

@media (max-width: 760px) {
  .band { width: 112vw; margin-left: -6vw; min-height: 88vh; margin-top: -44px; }
  .band-left { transform: skewY(-5deg) scaleY(0.85); }
  .band-right { transform: skewY(5deg) scaleY(0.85); }
  .band-left.is-visible { transform: skewY(-5deg) scaleY(1); }
  .band-right.is-visible { transform: skewY(5deg) scaleY(1); }
  .band-left .band-inner, .hero .band-inner { transform: skewY(5deg) translateY(24px); }
  .band-right .band-inner { transform: skewY(-5deg) translateY(24px); }
  .band-left.is-visible .band-inner, .hero .band-inner { transform: skewY(5deg) translateY(0); }
  .band-right.is-visible .band-inner { transform: skewY(-5deg) translateY(0); }
  .band-inner { padding: 12vh 12vw; }
  .left-copy, .right-copy { margin-left: 4%; margin-right: 4%; }
  p { font-size: 1.1rem; }
  .hero p, .final p { margin-left: 0; margin-top: 1rem; }
  .opening-ridge, .closing-ridge { width: 92vw; margin-left: 0; height: 110px; }
  .panorama { padding-left: 0; }
  .contours { width: 100vw; right: -20vw; }
}