:root {
  --ink-black: #171411;
  --rice-paper: #F5EBD8;
  --red-thread: #D7352A;
  --station-indigo: #243B73;
  --washed-jade: #8FB9A8;
  --ticket-ochre: #C9933A;
  --faded-plum: #8E5A71;
  --paper-shadow: rgba(23, 20, 17, 0.18);
}

/* DESIGN FONT TRACE: IBM Plex Sans Condensed** Condense for transit-diagram sharpness without becoming tech-mono. */

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink-black);
  background:
    radial-gradient(circle at 18% 12%, rgba(201, 147, 58, 0.2), transparent 22rem),
    radial-gradient(circle at 88% 45%, rgba(142, 90, 113, 0.2), transparent 25rem),
    linear-gradient(90deg, rgba(23, 20, 17, 0.05) 1px, transparent 1px),
    linear-gradient(0deg, rgba(23, 20, 17, 0.04) 1px, transparent 1px),
    var(--rice-paper);
  background-size: auto, auto, 9.5vw 9.5vw, 9.5vw 9.5vw, auto;
  font-family: "Gowun Dodum", "Noto Serif KR", sans-serif;
  overflow-x: hidden;
}

.paper-grain,
.paper-grain::before,
.paper-grain::after {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 1;
}

.paper-grain {
  opacity: 0.72;
  background-image:
    repeating-linear-gradient(103deg, transparent 0 11px, rgba(23, 20, 17, 0.025) 12px 13px),
    repeating-linear-gradient(7deg, rgba(245, 235, 216, 0.12) 0 6px, rgba(23, 20, 17, 0.018) 7px 8px);
  mix-blend-mode: multiply;
}

.paper-grain::before {
  content: "까지 まで  까지 まで";
  color: rgba(23, 20, 17, 0.045);
  font-family: "Noto Serif JP", serif;
  font-size: 12vw;
  letter-spacing: 0.22em;
  line-height: 1.5;
  transform: rotate(-7deg) translate(-6vw, 8vh);
}

.until-route {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 610vh;
  z-index: 4;
  pointer-events: none;
  overflow: visible;
}

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

.route-shadow {
  stroke: rgba(23, 20, 17, 0.18);
  stroke-width: 11;
  stroke-dasharray: 1 24;
}

.route-line {
  stroke: var(--red-thread);
  stroke-width: 5;
  filter: drop-shadow(0 2px 0 rgba(23, 20, 17, 0.22));
}

.thread-traveler {
  fill: var(--red-thread);
  stroke: var(--rice-paper);
  stroke-width: 4;
  filter: drop-shadow(0 6px 7px rgba(23, 20, 17, 0.3));
}

.paper-stage { position: relative; z-index: 3; }

.scene {
  position: relative;
  min-height: 100vh;
  padding: clamp(2rem, 5vw, 5rem);
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  grid-template-rows: repeat(7, minmax(4.5rem, auto));
  gap: clamp(0.75rem, 1.4vw, 1.6rem);
  isolation: isolate;
}

.scene::before,
.scene::after {
  content: "";
  position: absolute;
  z-index: -1;
  pointer-events: none;
}

.scene::before {
  inset: 1.5rem;
  border: 1px solid rgba(23, 20, 17, 0.16);
  clip-path: polygon(0 2%, 97% 0, 100% 91%, 79% 100%, 2% 97%);
}

.scene::after {
  inset: auto 4vw 0 4vw;
  height: 4rem;
  background: repeating-linear-gradient(90deg, rgba(23, 20, 17, 0.22) 0 2px, transparent 2px 14px);
  opacity: 0.25;
}

.boundary-gate h1 {
  grid-column: 1 / -1;
  grid-row: 2 / 5;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3vw;
  margin: 0;
  transform: rotate(-1deg);
}

.glyph {
  font-size: clamp(5.5rem, 19vw, 18rem);
  line-height: 0.82;
  text-shadow: 0.06em 0.05em 0 rgba(201, 147, 58, 0.26);
}

.ko { font-family: "Noto Serif KR", serif; color: var(--station-indigo); }
.jp { font-family: "Noto Serif JP", serif; color: var(--faded-plum); }

.thread-gap {
  width: clamp(4rem, 14vw, 14rem);
  height: 0.42rem;
  background: var(--red-thread);
  border-radius: 999px;
  box-shadow: 0 0.35rem 0 rgba(23, 20, 17, 0.14);
}

.map-code,
.station-code {
  font-family: "IBM Plex Sans Condensed", sans-serif;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.map-code {
  grid-column: 1 / 4;
  grid-row: 1;
  color: var(--ticket-ochre);
  border-top: 2px solid var(--ticket-ochre);
  padding-top: 0.5rem;
}

.lead {
  grid-column: 2 / 6;
  grid-row: 5 / 7;
  max-width: 37rem;
  font-family: "Fraunces", serif;
  font-size: clamp(1.25rem, 2.2vw, 2.35rem);
  line-height: 1.08;
  margin: 0;
}

.gate-bracket {
  position: absolute;
  top: 18vh;
  font-family: "Noto Serif JP", serif;
  font-size: clamp(8rem, 22vw, 21rem);
  color: rgba(23, 20, 17, 0.12);
}

.left-bracket { left: 2vw; }
.right-bracket { right: 2vw; }

.hanging-label {
  grid-column: 7 / 9;
  grid-row: 2;
  justify-self: end;
  padding: 0.8rem 1rem;
  background: rgba(143, 185, 168, 0.7);
  border: 1px solid var(--ink-black);
  transform: rotate(3deg);
  box-shadow: 0 0.7rem 0 var(--paper-shadow);
}

.ticket-strip {
  grid-column: 6 / 10;
  grid-row: 6;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  align-self: end;
  background: var(--ticket-ochre);
  padding: 1rem;
  border: 2px solid var(--ink-black);
  box-shadow: 0.7rem 0.7rem 0 rgba(36, 59, 115, 0.22);
}

.ticket-strip span {
  padding: 0.45rem 0.7rem;
  background: var(--rice-paper);
  border: 1px dashed var(--ink-black);
}

button {
  color: var(--ink-black);
  font: 700 0.95rem/1 "IBM Plex Sans Condensed", sans-serif;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
}

.stamp-button,
.arrival-button {
  border: 2px solid var(--ink-black);
  background: var(--rice-paper);
  padding: 0.9rem 1.1rem;
  box-shadow: 0.35rem 0.35rem 0 var(--red-thread);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.stamp-button:hover,
.arrival-button:hover { transform: translate(0.2rem, 0.2rem); box-shadow: 0.15rem 0.15rem 0 var(--red-thread); }

.boundary-gate .stamp-button { grid-column: 7 / 9; grid-row: 7; }

.ink-stamp {
  position: absolute;
  display: grid;
  place-items: center;
  width: 8.5rem;
  aspect-ratio: 1;
  border: 0.35rem double var(--red-thread);
  border-radius: 50%;
  color: var(--red-thread);
  font-family: "Noto Serif KR", serif;
  font-weight: 900;
  text-align: center;
  opacity: 0;
  transform: scale(1.9) rotate(-24deg);
  transition: opacity 260ms ease, transform 420ms cubic-bezier(.15,1.45,.38,1);
}

.ink-stamp.struck { opacity: 0.88; transform: scale(1) rotate(-12deg); }
.gate-stamp { right: 13vw; bottom: 13vh; }

.parcel-note,
.time-card,
.edge-manifest,
.limit-note {
  background: rgba(245, 235, 216, 0.88);
  border: 2px solid var(--ink-black);
  padding: clamp(1.2rem, 2.4vw, 2.3rem);
  box-shadow: 0.85rem 0.85rem 0 rgba(23, 20, 17, 0.13);
}

h2 {
  margin: 0.2rem 0 1rem;
  font-family: "Fraunces", serif;
  font-size: clamp(2.4rem, 5.5vw, 6rem);
  line-height: 0.9;
}

p { font-size: clamp(1rem, 1.35vw, 1.28rem); line-height: 1.55; }

.station-to { background: linear-gradient(112deg, transparent 55%, rgba(143, 185, 168, 0.35)); }
.parcel-note { grid-column: 2 / 6; grid-row: 2 / 6; transform: rotate(-2deg); }
.station-island {
  display: grid;
  place-items: center;
  border: 2px solid var(--station-indigo);
  background: rgba(143, 185, 168, 0.68);
  border-radius: 56% 44% 62% 38%;
  color: var(--station-indigo);
  font-family: "IBM Plex Sans Condensed", sans-serif;
  box-shadow: inset 0 0 0 0.55rem rgba(245, 235, 216, 0.55);
}
.station-island b { font-size: clamp(2rem, 4vw, 5rem); }
.station-island small { font-family: "Noto Serif KR", serif; font-size: 1.2rem; }
.island-a { grid-column: 7 / 9; grid-row: 2 / 4; }
.island-b { grid-column: 5 / 8; grid-row: 5 / 7; }

.signpost {
  border: 2px solid var(--ink-black);
  background: var(--ticket-ochre);
  padding: 0.8rem;
  box-shadow: 0.45rem 0.45rem 0 rgba(23, 20, 17, 0.18);
}
.vertical-jp { grid-column: 9; grid-row: 2 / 5; writing-mode: vertical-rl; font: 700 2.2rem "Noto Serif JP", serif; }
.ko-sign { grid-column: 1 / 3; grid-row: 6; font: 700 2rem "Noto Serif KR", serif; transform: rotate(4deg); }
.dotted-walk { grid-column: 6 / 10; grid-row: 4; display: flex; justify-content: space-around; align-items: center; }
.dotted-walk span { width: 1rem; height: 1rem; border-radius: 50%; background: var(--red-thread); opacity: 0.75; }

.time-until { background: linear-gradient(180deg, rgba(36, 59, 115, 0.17), transparent 60%); }
.fold-grid { grid-column: 1 / 5; grid-row: 2 / 7; display: grid; gap: 1rem; align-content: center; perspective: 900px; }
.paper-tab {
  min-height: 8rem;
  padding: 1rem;
  border: 2px solid var(--ink-black);
  background: var(--washed-jade);
  text-align: left;
  transform-origin: top;
  transform: rotateX(22deg) rotate(-1deg);
  transition: transform 360ms ease, background 260ms ease;
}
.paper-tab span { display: block; font-family: "Fraunces", serif; font-size: clamp(1.8rem, 3vw, 3.3rem); text-transform: none; letter-spacing: 0; }
.paper-tab em { display: block; margin-top: 1rem; font: 700 1.2rem "Noto Serif KR", serif; color: var(--station-indigo); opacity: 0; transform: translateY(-0.5rem); transition: 260ms ease; }
.paper-tab.open { background: rgba(201, 147, 58, 0.78); transform: rotateX(0deg) rotate(1deg); }
.paper-tab.open em { opacity: 1; transform: translateY(0); }
.time-card { grid-column: 6 / 10; grid-row: 2 / 5; }
.moon-ticket { grid-column: 6 / 9; grid-row: 6; padding: 1.2rem; background: var(--station-indigo); color: var(--rice-paper); font: 700 2.2rem "Noto Serif KR", serif; border-radius: 50% 50% 45% 45%; text-align: center; }
.moon-ticket small { display: block; font: 500 1rem "IBM Plex Sans Condensed", sans-serif; letter-spacing: 0.1em; text-transform: uppercase; }

.even-to-the-edge { overflow: hidden; }
.even-to-the-edge::before { clip-path: polygon(0 0, 90% 5%, 100% 32%, 94% 100%, 8% 96%, 2% 50%); }
.edge-manifest { grid-column: 4 / 9; grid-row: 2 / 5; background: rgba(142, 90, 113, 0.18); }
.measuring-thread { grid-column: 1 / 10; grid-row: 6; border-top: 0.45rem solid var(--red-thread); position: relative; }
.measuring-thread span { position: absolute; top: -2.7rem; left: 12vw; background: var(--rice-paper); padding: 0.45rem 0.8rem; border: 1px solid var(--ink-black); transform: rotate(-2deg); }
.charm-row { grid-column: 1 / 4; grid-row: 2 / 6; display: grid; gap: 1rem; align-content: center; }
.charm-row i { display: block; padding: 1rem; background: var(--rice-paper); border: 2px solid var(--red-thread); font: normal 700 2rem "Noto Serif KR", serif; text-align: center; transform: rotate(var(--turn, -3deg)); }
.charm-row i:nth-child(2) { --turn: 3deg; font-family: "Noto Serif JP"; }
.charm-row i:nth-child(3) { --turn: -5deg; color: var(--faded-plum); }
.charm-row i:nth-child(4) { --turn: 2deg; color: var(--station-indigo); font-family: "Noto Serif JP"; }

.limit-wall { background: linear-gradient(90deg, rgba(23, 20, 17, 0.08), transparent 55%); }
.ink-wall {
  grid-column: 1 / 5;
  grid-row: 1 / 8;
  background: var(--ink-black);
  color: var(--rice-paper);
  display: grid;
  place-items: center;
  clip-path: polygon(0 0, 86% 6%, 70% 35%, 96% 56%, 76% 100%, 0 100%);
  box-shadow: 1.2rem 0 0 rgba(215, 53, 42, 0.28);
}
.ink-wall span { writing-mode: vertical-rl; font: 700 clamp(2rem, 4vw, 4rem) "Fraunces", serif; }
.limit-note { grid-column: 5 / 9; grid-row: 3 / 6; background: rgba(245, 235, 216, 0.93); }
.wall-button { grid-column: 7 / 9; grid-row: 6; align-self: start; }
.wall-stamp { right: 11vw; top: 14vh; color: var(--ink-black); border-color: var(--ink-black); }

.arrival-seal {
  min-height: 110vh;
  background: radial-gradient(circle at 50% 48%, rgba(215, 53, 42, 0.16), transparent 22rem);
  place-items: center;
}
.arrival-particles { grid-column: 1 / -1; grid-row: 2 / 4; position: relative; width: min(76vw, 68rem); height: 17rem; }
.arrival-particles span { position: absolute; font-size: clamp(5rem, 15vw, 14rem); line-height: 1; transition: transform 900ms cubic-bezier(.15,1.1,.27,1), color 700ms ease; }
.final-ko { left: 8%; font-family: "Noto Serif KR", serif; color: var(--station-indigo); }
.final-jp { right: 8%; font-family: "Noto Serif JP", serif; color: var(--faded-plum); }
.arrival-seal.arrived .final-ko { transform: translateX(34%) rotate(-7deg); color: var(--red-thread); }
.arrival-seal.arrived .final-jp { transform: translateX(-34%) rotate(7deg); color: var(--red-thread); }
.arrival-button { grid-column: 4 / 7; grid-row: 5; z-index: 2; }
.bilingual-seal {
  grid-column: 4 / 7;
  grid-row: 4 / 7;
  width: clamp(14rem, 28vw, 25rem);
  aspect-ratio: 1;
  display: grid;
  place-content: center;
  gap: 0.4rem;
  border: 0.55rem double var(--red-thread);
  border-radius: 50%;
  color: var(--red-thread);
  background: rgba(245, 235, 216, 0.8);
  font: 900 clamp(2rem, 4vw, 4.2rem) "Noto Serif KR", serif;
  text-align: center;
  opacity: 0;
  transform: scale(1.45) rotate(-20deg);
  transition: opacity 360ms ease, transform 600ms cubic-bezier(.15,1.45,.38,1);
}
.arrival-seal.arrived .bilingual-seal { opacity: 0.96; transform: scale(1) rotate(-8deg); }
.closing-line { grid-column: 3 / 8; grid-row: 7; text-align: center; font-family: "Fraunces", serif; font-size: clamp(1.4rem, 2.4vw, 2.6rem); line-height: 1.1; }

.scene.in-view .parcel-note,
.scene.in-view .time-card,
.scene.in-view .edge-manifest,
.scene.in-view .limit-note { animation: inkSettle 700ms ease both; }

@keyframes inkSettle {
  from { opacity: 0.45; filter: blur(2px); transform: translateY(1rem) rotate(-2deg); }
  to { opacity: 1; filter: blur(0); }
}

@media (max-width: 760px) {
  .scene { grid-template-columns: repeat(4, 1fr); padding: 1.2rem; }
  .boundary-gate h1 { flex-direction: column; grid-row: 2 / 5; }
  .thread-gap { width: 0.42rem; height: 5rem; }
  .lead, .ticket-strip, .parcel-note, .time-card, .edge-manifest, .limit-note, .closing-line { grid-column: 1 / -1; }
  .hanging-label, .station-island, .signpost, .fold-grid, .moon-ticket, .charm-row, .ink-wall, .arrival-button, .bilingual-seal, .arrival-particles { grid-column: 1 / -1; }
  .until-route { height: 650vh; }
}