:root {
  --parchment: #E8D7B3;
  --umber: #5B3626;
  --moss: #657A45;
  --ochre: #C98B3A;
  --clay: #A45136;
  --pine: #24392F;
  --cream: #F4E8C8;
  --progress: 0;
}

* { box-sizing: border-box; }

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

.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 20;
  opacity: .28;
  background-image: radial-gradient(rgba(91, 54, 38, .16) 1px, transparent 1px), linear-gradient(90deg, rgba(244, 232, 200, .18), rgba(36, 57, 47, .06));
  background-size: 5px 5px, 100% 100%;
  mix-blend-mode: multiply;
}

.fixed-map {
  position: fixed;
  inset: 0;
  overflow: hidden;
  background: linear-gradient(180deg, #F4E8C8 0%, #E8D7B3 58%, #C98B3A 160%);
  transition: background 800ms ease;
}

.fixed-map.dusk-mode { background: linear-gradient(180deg, #E8D7B3 0%, #A45136 60%, #24392F 125%); }
.fixed-map.night-mode { background: linear-gradient(180deg, #24392F 0%, #5B3626 88%); }

.sun-disc {
  position: absolute;
  width: 18rem;
  height: 18rem;
  right: 8vw;
  top: 7vh;
  border-radius: 50%;
  background: repeating-linear-gradient(0deg, rgba(201,139,58,.28) 0 8px, rgba(244,232,200,.7) 8px 16px);
  box-shadow: 0 0 0 18px rgba(201, 139, 58, .07);
}

.iso-grid {
  position: absolute;
  inset: -20%;
  transform: rotateX(58deg) rotateZ(-30deg) translateY(16%);
  background-image: linear-gradient(rgba(91,54,38,.11) 1px, transparent 1px), linear-gradient(90deg, rgba(91,54,38,.11) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: .42;
}

.route-map {
  position: absolute;
  inset: 4vh 5vw;
  z-index: 7;
  overflow: visible;
}

.route-shadow, .route-line {
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.route-shadow { stroke: rgba(91,54,38,.32); stroke-width: 16; transform: translate(8px, 12px); }
.route-line {
  stroke: var(--ochre);
  stroke-width: 8;
  stroke-dasharray: 1;
  stroke-dashoffset: calc(1 - var(--progress));
  filter: drop-shadow(0 2px 0 var(--umber));
}

.route-dots circle { fill: var(--cream); stroke: var(--clay); stroke-width: 4; transform-box: fill-box; transform-origin: center; scale: .65; transition: scale 500ms ease; }
.route-dots circle.active { scale: 1.15; }

.mountain {
  position: absolute;
  left: 50%;
  bottom: -15vh;
  transform: translateX(-50%) rotateX(60deg) rotateZ(-45deg);
  transform-style: preserve-3d;
  border-radius: 26px;
  box-shadow: 20px 25px 0 rgba(91,54,38,.16);
}

.mountain-back { width: 64vw; height: 64vw; background: linear-gradient(135deg, #657A45 0 48%, #52693E 49% 100%); opacity: .62; bottom: 14vh; }
.mountain-mid { width: 76vw; height: 76vw; background: repeating-linear-gradient(135deg, #E8D7B3 0 24px, #D2BD91 24px 30px, #657A45 30px 54px); opacity: .86; bottom: -6vh; }
.mountain-front { width: 58vw; height: 58vw; background: linear-gradient(135deg, #A45136 0 35%, #C98B3A 36% 58%, #5B3626 59%); opacity: .32; bottom: -24vh; }

.pine { position: absolute; width: 0; height: 0; border-left: 18px solid transparent; border-right: 18px solid transparent; border-bottom: 58px solid var(--pine); z-index: 8; filter: drop-shadow(8px 8px 0 rgba(91,54,38,.2)); }
.pine:after { content: ""; position: absolute; left: -8px; top: 48px; width: 16px; height: 28px; background: var(--umber); }
.p1 { left: 19vw; top: 63vh; } .p2 { left: 28vw; top: 48vh; scale: .8; } .p3 { right: 25vw; top: 52vh; scale: 1.1; } .p4 { right: 15vw; top: 31vh; scale: .72; } .p5 { left: 44vw; top: 28vh; scale: .65; }

.cabin, .coin-reservoir, .tunnel, .antenna, .lantern, .cable { position: absolute; z-index: 9; filter: drop-shadow(10px 12px 0 rgba(91,54,38,.20)); }
.cabin { left: 12vw; top: 68vh; width: 94px; height: 62px; background: var(--umber); border: 5px solid var(--cream); transform: skewY(-12deg); }
.cabin:before { content: ""; position: absolute; left: -10px; top: -38px; border-left: 58px solid transparent; border-right: 58px solid transparent; border-bottom: 42px solid var(--clay); }
.cabin span { position: absolute; right: 14px; top: 19px; width: 18px; height: 18px; background: var(--ochre); box-shadow: 0 0 18px var(--ochre); animation: blink 2.4s infinite; }

.coin-reservoir { left: 31vw; top: 51vh; width: 126px; height: 72px; border-radius: 50%; background: #B89A68; border: 6px solid var(--umber); transform: rotate(-9deg); }
.coin-reservoir i { position: absolute; width: 28px; height: 28px; border-radius: 50%; background: var(--ochre); border: 3px solid var(--umber); top: 16px; }
.coin-reservoir i:nth-child(1) { left: 20px; } .coin-reservoir i:nth-child(2) { left: 50px; top: 25px; } .coin-reservoir i:nth-child(3) { right: 18px; }
.tunnel { left: 50vw; top: 54vh; width: 112px; height: 72px; border-radius: 60px 60px 8px 8px; background: var(--pine); border: 8px solid var(--umber); }
.antenna { right: 18vw; top: 28vh; width: 14px; height: 120px; background: var(--umber); }
.antenna:before, .antenna:after { content: ""; position: absolute; border: 2px solid var(--ochre); border-radius: 50%; inset: -22px -42px auto; height: 38px; animation: pulse 2s infinite; }
.antenna:after { animation-delay: .8s; inset: -42px -70px auto; height: 70px; }
.antenna span { position: absolute; bottom: -24px; left: -24px; width: 64px; height: 30px; background: var(--pine); }
.lantern { right: 25vw; top: 62vh; width: 48px; height: 68px; background: var(--ochre); border: 6px solid var(--umber); border-radius: 22px 22px 8px 8px; box-shadow: 0 0 32px rgba(201,139,58,.75); }
.cable { left: 58vw; top: 36vh; width: 210px; height: 4px; background: var(--umber); transform: rotate(-18deg); }
.cable span { position: absolute; top: 4px; left: 80px; width: 42px; height: 34px; background: var(--clay); border: 4px solid var(--cream); animation: cablecar 6s ease-in-out infinite alternate; }

.expedition { position: relative; z-index: 10; }
.chapter { min-height: 100vh; position: relative; display: flex; align-items: center; padding: 8vw; }
.hero { align-items: flex-start; padding-top: 12vh; }

.trailhead-sign, .placard, .summit-ledger, .specimen {
  background: linear-gradient(180deg, rgba(244,232,200,.96), rgba(232,215,179,.92));
  border: 5px solid var(--umber);
  box-shadow: 14px 14px 0 rgba(91,54,38,.26), inset 0 0 0 2px rgba(201,139,58,.28);
}

.trailhead-sign { width: min(760px, 88vw); padding: 2rem 2.3rem; transform: rotate(-1.5deg); }
.trailhead-sign small, .permit, .stamp, .scroll-ticket, .specimen, .ledger-row { font-family: "Alegreya SC", serif; letter-spacing: .08em; text-transform: uppercase; }
h1, h2 { font-family: "Roboto Slab", Rockwell, serif; margin: 0; color: var(--umber); line-height: .92; letter-spacing: -.045em; }
h1 { font-size: clamp(4.6rem, 15vw, 12rem); }
h2 { font-size: clamp(2.3rem, 6vw, 5.2rem); }
p, li { font-size: clamp(1.05rem, 1.7vw, 1.38rem); line-height: 1.45; }

.permit { position: absolute; right: 9vw; top: 10vh; padding: .8rem 1.1rem; border: 3px solid var(--clay); color: var(--clay); background: rgba(244,232,200,.78); transform: rotate(6deg); }
.scroll-ticket { position: absolute; left: 10vw; bottom: 8vh; padding: .7rem 1rem; background: var(--ochre); color: var(--cream); border: 3px solid var(--umber); animation: bob 1.8s infinite ease-in-out; }

.placard { width: min(610px, 88vw); padding: 1.6rem 1.9rem; opacity: 0; transform: translateY(60px) rotate(-1deg); transition: opacity 750ms ease, transform 750ms ease; }
.chapter.in-view .placard { opacity: 1; transform: translateY(0) rotate(-1deg); }
.placard.right { margin-left: auto; transform: translateY(60px) rotate(1.2deg); }
.chapter.in-view .placard.right { transform: translateY(0) rotate(1.2deg); }
.stamp { display: inline-block; margin-bottom: .8rem; padding: .36rem .62rem; border: 3px solid var(--ochre); color: var(--ochre); background: rgba(244,232,200,.6); transform: rotate(-2deg); }
.warning .stamp, .red-card { color: var(--clay); border-color: var(--clay); }
.night { background: linear-gradient(180deg, rgba(36,57,47,.95), rgba(91,54,38,.92)); color: var(--cream); border-color: var(--cream); }
.night h2 { color: var(--cream); }

ul { padding-left: 1.1rem; }
li::marker { color: var(--ochre); }

.specimen { position: absolute; width: 220px; padding: 1rem; font-size: .86rem; line-height: 1.25; }
.specimen strong { display: block; font-family: "Roboto Slab", serif; font-size: 1.05rem; margin-top: .35rem; text-transform: none; }
.specimen em { display: block; font-family: "IBM Plex Mono", monospace; font-style: normal; margin-top: .4rem; color: var(--moss); }
.reservoir-card { right: 14vw; bottom: 17vh; transform: rotate(5deg); }
.tunnel-card { left: 13vw; bottom: 14vh; transform: rotate(-4deg); }
.red-card { right: 10vw; top: 19vh; transform: rotate(4deg); }
.lantern-card { left: 13vw; top: 17vh; transform: rotate(-5deg); }

.forks { display: flex; gap: .65rem; flex-wrap: wrap; margin: 1rem 0; }
.forks button { font-family: "IBM Plex Mono", monospace; text-transform: uppercase; padding: .7rem .9rem; border: 3px solid var(--umber); background: var(--clay); color: var(--cream); cursor: pointer; box-shadow: 4px 4px 0 var(--umber); transform: rotate(-1deg); }
.forks button:nth-child(2) { background: var(--moss); transform: rotate(2deg); }
.forks button:nth-child(3) { background: var(--ochre); }
.debate-note { min-height: 3.8rem; font-family: "IBM Plex Mono", monospace; font-size: 1rem; }

.summit { justify-content: center; align-items: flex-end; padding-bottom: 10vh; }
.summit-ledger { width: min(900px, 90vw); padding: 2rem; text-align: center; transform: rotate(.7deg); }
.ledger-row { display: flex; justify-content: space-between; gap: 1rem; border-top: 3px dashed var(--umber); margin-top: 1.2rem; padding-top: .8rem; font-family: "IBM Plex Mono", monospace; color: var(--pine); }

@keyframes blink { 0%, 70%, 100% { opacity: 1; } 75%, 82% { opacity: .2; } }
@keyframes pulse { from { opacity: .7; transform: scale(.6); } to { opacity: 0; transform: scale(1.35); } }
@keyframes bob { 0%,100% { transform: translateY(0) rotate(-2deg); } 50% { transform: translateY(-10px) rotate(2deg); } }
@keyframes cablecar { from { transform: translateX(-55px); } to { transform: translateX(85px); } }

@media (max-width: 760px) {
  .chapter { padding: 8vh 6vw; align-items: flex-start; }
  .hero { padding-top: 14vh; }
  .specimen { position: relative; left: auto; right: auto; top: auto; bottom: auto; margin-top: 1rem; }
  .chapter { flex-direction: column; }
  .permit { right: 5vw; top: 3vh; }
  .ledger-row { flex-direction: column; }
  .mountain-back, .mountain-mid, .mountain-front { width: 130vw; height: 130vw; }
}