:root {
  /* DESIGN typography tokens: Space Mono** wordmark, IBM Plex Mono** body copy, from Google Fonts for the mountain field station. */
  --deep-summit-navy: #071326;
  --oxidized-steel-blue: #243A57;
  --brushed-gunmetal: #6F7D8C;
  --warm-cabin-amber: #F2A94A;
  --snowlit-cream: #F4E8D0;
  --alpine-moss: #7F9B68;
  --ember-copper: #B7643C;
  --space: "Space Mono", "Courier New", monospace;
  --plex: "IBM Plex Mono", "Courier New", monospace;
  --az: "Azeret Mono", "Courier New", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--deep-summit-navy);
  color: var(--snowlit-cream);
  font-family: var(--plex);
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 18% 8%, rgba(242, 169, 74, .18), transparent 22%),
    radial-gradient(circle at 82% 76%, rgba(127, 155, 104, .16), transparent 26%),
    linear-gradient(135deg, #071326 0%, #0b1b31 48%, #071326 100%);
  z-index: -4;
}

.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .24;
  z-index: 10;
  background-image:
    repeating-radial-gradient(circle at 20% 30%, rgba(244, 232, 208, .08) 0 1px, transparent 1px 4px),
    repeating-linear-gradient(90deg, rgba(255,255,255,.03) 0 1px, transparent 1px 5px);
  mix-blend-mode: overlay;
}

.topo-field {
  position: fixed;
  inset: -20%;
  z-index: -2;
  background:
    repeating-radial-gradient(ellipse at 30% 35%, transparent 0 34px, rgba(111, 125, 140, .17) 35px 36px, transparent 37px 70px),
    repeating-radial-gradient(ellipse at 70% 68%, transparent 0 42px, rgba(127, 155, 104, .12) 43px 44px, transparent 45px 86px);
  transform: translate3d(var(--drift-x, 0), var(--drift-y, 0), 0);
  transition: transform .2s linear;
}

.expedition { perspective: 1200px; }

.stage {
  position: relative;
  min-height: 100vh;
  padding: clamp(24px, 4vw, 56px);
  overflow: hidden;
  isolation: isolate;
}

.trailhead { display: grid; grid-template-rows: 1fr auto; }

.photo-panorama {
  position: absolute;
  inset: 24px 24px auto 24px;
  height: 68vh;
  border: 12px solid var(--snowlit-cream);
  border-bottom-width: 36px;
  background: var(--oxidized-steel-blue);
  box-shadow: 0 40px 90px rgba(0,0,0,.55), inset 0 0 0 1px rgba(7,19,38,.75);
  overflow: hidden;
  transform-style: preserve-3d;
}

.photo-panorama::before, .weather-photo::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(110deg, rgba(7, 19, 38, .22), rgba(36, 58, 87, .62)), radial-gradient(circle at 82% 62%, rgba(242,169,74,.25), transparent 18%);
  z-index: 4;
}

.ridge-sky {
  position: absolute;
  inset: 0;
  background: linear-gradient(#162d49, #31435a 45%, #0a1728 100%);
}

.ridge {
  position: absolute;
  left: -8%;
  width: 116%;
  clip-path: polygon(0 72%, 10% 62%, 20% 69%, 31% 43%, 43% 58%, 54% 34%, 66% 62%, 76% 48%, 88% 66%, 100% 50%, 100% 100%, 0 100%);
}

.ridge-back { bottom: 18%; height: 54%; background: #6F7D8C; opacity: .42; }
.ridge-mid { bottom: 6%; height: 56%; background: #243A57; opacity: .82; transform: translateX(-2%); }
.ridge-front { bottom: -8%; height: 54%; background: #071326; }

.fog, .weather-mist {
  position: absolute;
  left: -20%;
  width: 140%;
  height: 20%;
  background: linear-gradient(90deg, transparent, rgba(244,232,208,.27), transparent);
  filter: blur(12px);
  z-index: 5;
  animation: fogSlide 16s ease-in-out infinite alternate;
}

.fog-one { top: 30%; }
.fog-two { top: 52%; animation-duration: 21s; opacity: .65; }

.cabin-light, .lamp-glow, .beacon {
  position: absolute;
  border-radius: 50%;
  background: var(--warm-cabin-amber);
  box-shadow: 0 0 26px var(--warm-cabin-amber), 0 0 80px rgba(242,169,74,.55);
  animation: pulse 2.8s ease-in-out infinite;
}

.cabin-light { right: 18%; bottom: 25%; width: 16px; height: 16px; z-index: 6; }
.beacon { position: fixed; width: 7px; height: 7px; z-index: 1; }
.beacon-a { left: 12vw; top: 18vh; }
.beacon-b { right: 10vw; bottom: 22vh; animation-delay: 1s; }

.photo-serial, .route-kicker, .plate-label, .final-marker {
  font-family: var(--space);
  letter-spacing: .08em;
  text-transform: uppercase;
}

.photo-serial { position: absolute; left: 18px; bottom: -29px; color: var(--deep-summit-navy); z-index: 7; font-size: 12px; font-weight: 700; }

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

.z-trail path { fill: none; stroke: var(--warm-cabin-amber); stroke-width: 3; stroke-dasharray: 14 12; filter: drop-shadow(0 0 8px rgba(242,169,74,.7)); }
.z-trail circle { fill: var(--ember-copper); stroke: var(--snowlit-cream); stroke-width: 2; }

.plate-label {
  position: absolute;
  z-index: 5;
  padding: 12px 16px;
  color: var(--snowlit-cream);
  background: rgba(36, 58, 87, .82);
  border: 1px solid var(--brushed-gunmetal);
  box-shadow: 0 14px 40px rgba(0,0,0,.35);
  font-size: 12px;
}

.coord-label { top: 52px; left: 54px; }
.ridge-caption { top: 78px; right: 64px; max-width: 330px; color: var(--warm-cabin-amber); }

.metal-sign {
  position: relative;
  z-index: 6;
  align-self: center;
  justify-self: start;
  width: min(760px, 78vw);
  margin: 28vh 0 0 6vw;
  padding: clamp(28px, 5vw, 56px);
  background:
    linear-gradient(110deg, rgba(255,255,255,.08), transparent 18%, rgba(255,255,255,.07) 34%, transparent 55%),
    linear-gradient(145deg, #243A57, #152945 64%, #071326);
  border: 1px solid var(--brushed-gunmetal);
  box-shadow: 0 34px 100px rgba(0,0,0,.62), inset 0 0 0 2px rgba(244,232,208,.08);
  transform-style: preserve-3d;
}

.metal-sign h1 {
  margin: 0;
  font: 700 clamp(54px, 11vw, 142px)/.9 var(--space);
  letter-spacing: -.07em;
  color: var(--snowlit-cream);
  text-shadow: 0 2px 0 var(--deep-summit-navy), 0 0 35px rgba(242,169,74,.2);
}

.route-kicker { margin: 0 0 12px; color: var(--warm-cabin-amber); font-size: 12px; font-weight: 700; }
.sign-note { max-width: 560px; color: rgba(244,232,208,.86); line-height: 1.65; }

.screws span {
  position: absolute;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #F4E8D0, #6F7D8C 35%, #071326 80%);
}
.screws span:nth-child(1) { top: 14px; left: 14px; }
.screws span:nth-child(2) { top: 14px; right: 14px; }
.screws span:nth-child(3) { bottom: 14px; left: 14px; }
.screws span:nth-child(4) { bottom: 14px; right: 14px; }

.field-note {
  z-index: 6;
  width: min(420px, 82vw);
  padding: 20px;
  background: var(--snowlit-cream);
  color: var(--deep-summit-navy);
  box-shadow: 0 20px 55px rgba(0,0,0,.45);
  transform: rotate(-3deg);
}
.field-note span { color: var(--ember-copper); font: 700 12px var(--space); }
.field-note p { line-height: 1.55; }
.bottom-note { position: absolute; right: 56px; bottom: 42px; }

.switchback {
  background: linear-gradient(160deg, rgba(36,58,87,.35), transparent 58%);
}

.chapter-word {
  position: absolute;
  top: 3vh;
  left: -3vw;
  font: 800 clamp(72px, 18vw, 250px)/.8 var(--az);
  color: rgba(111,125,140,.17);
  letter-spacing: -.08em;
}

.diagonal-ribbon {
  position: absolute;
  left: -8vw;
  top: 43vh;
  width: 120vw;
  padding: 14px;
  transform: rotate(-16deg);
  background: var(--ember-copper);
  color: var(--snowlit-cream);
  font: 700 13px var(--space);
  text-align: center;
  letter-spacing: .12em;
  text-transform: uppercase;
  box-shadow: 0 18px 50px rgba(0,0,0,.42);
}

.route-card {
  position: absolute;
  z-index: 3;
  width: min(430px, 82vw);
  padding: 26px;
  background: linear-gradient(145deg, rgba(36,58,87,.96), rgba(7,19,38,.92));
  border: 1px solid var(--brushed-gunmetal);
  box-shadow: 0 28px 70px rgba(0,0,0,.48), inset 4px 0 0 var(--warm-cabin-amber);
  transform: rotate(-4deg);
}

.route-card:nth-of-type(1) { left: 8vw; top: 18vh; }
.card-two { right: 12vw; top: 35vh; transform: rotate(5deg); }
.card-three { left: 25vw; bottom: 8vh; transform: rotate(-2deg); }
.waypoint { font: 700 54px var(--space); color: var(--warm-cabin-amber); }
.route-card h2, .weather-copy h2, .summit-log h2 { font-family: var(--space); font-size: clamp(28px, 4vw, 54px); line-height: 1; margin: 6px 0 18px; }
.route-card p, .weather-copy p, .summit-log p { line-height: 1.65; color: rgba(244,232,208,.84); }
code { display: block; margin-top: 18px; color: var(--alpine-moss); font-family: var(--plex); }

.code-slope {
  position: absolute;
  right: 4vw;
  bottom: 8vh;
  display: grid;
  gap: 10px;
  transform: rotate(-16deg);
  color: rgba(244,232,208,.68);
}
.code-slope span { padding: 8px 14px; background: rgba(7,19,38,.72); border-left: 2px solid var(--alpine-moss); }

.weather {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 40px;
  align-items: center;
}

.instrument-glass {
  min-height: 68vh;
  border: 1px solid rgba(244,232,208,.28);
  background: rgba(111,125,140,.16);
  box-shadow: 0 35px 90px rgba(0,0,0,.45), inset 0 0 60px rgba(244,232,208,.08);
  backdrop-filter: blur(3px);
  position: relative;
  overflow: hidden;
  padding: 24px;
}

.weather-photo { position: absolute; inset: 42px; overflow: hidden; background: #243A57; border: 8px solid var(--snowlit-cream); }
.weather-mist { top: 38%; animation-duration: 18s; }
.dial { position: absolute; right: 34px; bottom: 34px; width: 150px; height: 150px; border-radius: 50%; border: 2px solid var(--brushed-gunmetal); background: rgba(7,19,38,.74); display: grid; place-items: center; color: var(--warm-cabin-amber); font: 700 36px var(--space); box-shadow: inset 0 0 30px rgba(242,169,74,.12); }
.dial span { position: absolute; width: 2px; height: 46%; top: 4%; background: var(--brushed-gunmetal); transform-origin: 50% 100%; }
.dial span:nth-child(2) { transform: rotate(55deg); }
.dial span:nth-child(3) { transform: rotate(115deg); }

.weather-copy { position: relative; z-index: 2; padding: 34px; background: rgba(36,58,87,.72); border: 1px solid var(--brushed-gunmetal); box-shadow: 0 28px 70px rgba(0,0,0,.38); }
.scrap-stack { position: absolute; right: 8vw; bottom: 8vh; display: grid; gap: 12px; }
.scrap { padding: 12px 16px; background: var(--snowlit-cream); color: var(--deep-summit-navy); font: 700 12px var(--space); box-shadow: 0 14px 28px rgba(0,0,0,.35); transform: rotate(-3deg); }
.scrap.copper { background: var(--ember-copper); color: var(--snowlit-cream); transform: rotate(2deg); }
.scrap.moss { background: var(--alpine-moss); color: var(--deep-summit-navy); transform: rotate(-1deg); }

.summit {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 34px;
  align-items: center;
  background: radial-gradient(circle at 22% 46%, rgba(242,169,74,.22), transparent 22%);
}

.summit-room { position: relative; min-height: 70vh; background: linear-gradient(145deg, #1b2f49, #071326); border: 12px solid #243A57; box-shadow: 0 45px 100px rgba(0,0,0,.58); overflow: hidden; }
.window-grid { position: absolute; inset: 70px 80px auto; height: 240px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.window-grid span { background: linear-gradient(#F2A94A, #B7643C); box-shadow: 0 0 60px rgba(242,169,74,.55); }
.lamp-glow { width: 90px; height: 90px; left: 50%; bottom: 18%; transform: translateX(-50%); }
.desk-map { position: absolute; left: 8%; right: 8%; bottom: 6%; height: 150px; background: repeating-radial-gradient(ellipse at 40% 60%, transparent 0 18px, rgba(244,232,208,.32) 19px 20px, transparent 21px 38px), var(--snowlit-cream); transform: rotate(-2deg); box-shadow: 0 18px 45px rgba(0,0,0,.4); }

.summit-log { padding: clamp(28px, 5vw, 60px); background: linear-gradient(145deg, rgba(36,58,87,.92), rgba(7,19,38,.95)); border: 1px solid var(--brushed-gunmetal); box-shadow: 0 35px 90px rgba(0,0,0,.42); }
.stamp-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.stamp-row span { padding: 10px 12px; border: 1px solid var(--brushed-gunmetal); color: var(--warm-cabin-amber); font: 700 12px var(--space); }
.final-marker { position: absolute; right: 34px; bottom: 24px; color: var(--brushed-gunmetal); font-size: 12px; }

.tilt-object { will-change: transform; transition: transform .18s ease-out, box-shadow .18s ease-out; }
.tilt-object.is-lit { box-shadow: 0 35px 95px rgba(0,0,0,.5), 0 0 42px rgba(242,169,74,.14); }

@keyframes fogSlide { from { transform: translateX(-7%); } to { transform: translateX(7%); } }
@keyframes pulse { 0%, 100% { opacity: .62; transform: scale(.82); } 50% { opacity: 1; transform: scale(1.15); } }

@media (max-width: 860px) {
  .stage { min-height: auto; padding: 22px; }
  .trailhead { min-height: 100vh; }
  .photo-panorama { inset: 16px; height: 58vh; }
  .metal-sign { margin: 30vh 0 0; width: 100%; }
  .bottom-note { right: 22px; bottom: 22px; }
  .ridge-caption { top: 126px; right: 22px; }
  .coord-label { top: 32px; left: 22px; }
  .switchback { min-height: 1180px; }
  .route-card, .route-card:nth-of-type(1), .card-two, .card-three { left: auto; right: auto; top: auto; bottom: auto; position: relative; width: 100%; margin: 110px 0 0; }
  .card-two, .card-three { margin-top: 28px; }
  .code-slope { right: 22px; bottom: 36px; }
  .weather, .summit { grid-template-columns: 1fr; }
  .instrument-glass, .summit-room { min-height: 58vh; }
  .scrap-stack { position: relative; right: auto; bottom: auto; margin-top: 18px; }
}