.outside-page {
  --outside-shell: min(86rem, calc(100% - 3rem));
  --outside-rule: var(--rule, #cfcfc8);
  --outside-ink: var(--ink, #17181a);
  --outside-muted: var(--ink-muted, #5e6065);
  --outside-canvas: var(--canvas, #f3f3ef);
  --outside-surface: var(--surface, #fbfbf8);
  --outside-accent: var(--accent, #2457d6);
  --outside-accent-hover: var(--accent-hover, #163da7);
  --outside-sage: #5e7f57;
  margin: 0;
  overflow-x: hidden;
  color: var(--outside-ink);
  background: var(--outside-canvas);
  font-family: var(--font-body);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

.outside-page,
.outside-page * {
  box-sizing: border-box;
}

.outside-page a {
  color: inherit;
  text-underline-offset: 0.18em;
}

.outside-page button,
.outside-page a {
  -webkit-tap-highlight-color: transparent;
}

.outside-page img {
  display: block;
  height: auto;
  max-width: 100%;
}

.outside-shell {
  width: var(--outside-shell);
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: -6rem;
  left: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--outside-ink);
  color: var(--inverse-ink, #f7f7f2);
}

.skip-link:focus {
  top: 0.75rem;
}

.load-state {
  margin-block: 1rem 0;
  padding: 0.9rem 1rem;
  border: 1px solid #a12b2b;
  background: var(--outside-surface);
  color: #7a2020;
}

.load-state[hidden] {
  display: none;
}

.outside-header {
  min-height: 4.5625rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  border-bottom: 1px solid var(--outside-rule);
}

.outside-wordmark {
  text-decoration: none;
}

.outside-wordmark span,
.outside-wordmark strong,
.outside-header__meta span {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--micro);
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.outside-wordmark strong {
  margin-top: 0.2rem;
  font-size: var(--meta);
}

.outside-header__meta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  color: var(--outside-muted);
}

.outside-header__meta a {
  width: fit-content;
  font-size: var(--meta);
  font-weight: 700;
}

.outside-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(16rem, 0.4fr);
  gap: clamp(2rem, 6vw, 6rem);
  align-items: end;
  padding-block: clamp(3rem, 7vw, 6rem) clamp(2.5rem, 5vw, 4rem);
}

.outside-eyebrow,
.section-marker > p,
.evidence-panel__head > p,
.zone-tab__number,
.zone-stage__kicker,
.reading-label,
.shared-seam p,
.image-dialog header p {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--micro);
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.outside-eyebrow,
.section-marker > p {
  color: var(--outside-accent);
}

.outside-hero h1,
.section-marker h2,
.shared-seam h2,
.zone-stage h3,
.evidence-panel h3,
.image-dialog h2 {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.035em;
}

.outside-hero h1 {
  max-width: 48rem;
  margin: 0.75rem 0 1.2rem;
  font-size: clamp(2rem, 3vw, 2.125rem);
  line-height: 1.16;
}

.outside-lede {
  max-width: 46rem;
  margin: 0;
  color: var(--outside-muted);
  font-size: clamp(1rem, 1.3vw, 1.125rem);
}

.outside-metrics {
  margin: 0;
  border-top: 1px solid var(--outside-ink);
}

.outside-metrics div {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--outside-rule);
}

.outside-metrics dt,
.outside-metrics dd {
  font-family: var(--font-mono);
  font-size: var(--micro);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.outside-metrics dt {
  color: var(--outside-muted);
  font-weight: 700;
}

.outside-metrics dd {
  margin: 0;
}

.shared-seam {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(16rem, 0.75fr) minmax(0, 1fr);
  min-height: 10rem;
  border: 1px solid var(--outside-rule);
  background: var(--outside-surface);
}

.shared-seam__side,
.shared-seam__boundary {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(1.25rem, 3vw, 2rem);
}

/* 경계 상세는 항상 떠 있지 않는다. 마우스를 올리거나 초점이 갔을 때만 카드로 나온다. */
.seam-tip {
  position: absolute;
  z-index: 30;
  inset-inline: clamp(0.75rem, 2vw, 1.5rem);
  top: calc(100% - 0.75rem);
  padding: 0.9rem 1rem 1rem;
  border: 1px solid var(--outside-ink);
  background: var(--outside-surface);
  box-shadow: 0 14px 30px rgba(23, 24, 26, 0.12);
  text-align: left;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-0.25rem);
  transition: opacity 0.16s ease, transform 0.16s ease, visibility 0.16s;
  pointer-events: none;
}

.seam-tip > p:first-child {
  margin: 0 0 0.5rem;
  color: var(--outside-accent);
  font-family: var(--font-mono);
  font-size: var(--micro);
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.seam-tip > p + p {
  margin: 0;
  color: var(--outside-ink);
  font-size: var(--small);
  letter-spacing: 0;
  text-transform: none;
  text-align: left;
}

.seam-tip code {
  display: block;
  margin-top: 0.6rem;
  font-family: var(--font-mono);
  font-size: var(--micro);
  color: var(--outside-muted);
}

.shared-seam__side:hover .seam-tip,
.shared-seam__side:focus-visible .seam-tip,
.shared-seam__boundary:hover .seam-tip,
.shared-seam__boundary:focus-visible .seam-tip {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.shared-seam__side:focus-visible,
.shared-seam__boundary:focus-visible {
  outline: 2px solid var(--outside-accent);
  outline-offset: -2px;
}

.shared-seam__side {
  align-items: center;
  text-align: center;
}

.shared-seam__side--outside {
  border-right: 1px solid var(--outside-rule);
}

.shared-seam__side--inside {
  border-left: 1px solid var(--outside-rule);
  color: var(--outside-muted);
}

.shared-seam__side--outside > p,
.shared-seam__side--inside > p {
  width: 100%;
}

.shared-seam__side--outside > p {
  text-align: left;
}

.shared-seam__side--inside > p {
  text-align: right;
}

.shared-seam__side p,
.shared-seam__boundary span {
  color: var(--outside-accent);
}

.shared-seam h2 {
  margin: 0.3rem 0 0.15rem;
  font-size: clamp(1.5rem, 2.5vw, 2.1rem);
}

.shared-seam__side span,
.shared-seam__boundary p {
  font-size: var(--small);
}

.shared-seam__side span {
  max-width: 18rem;
  text-align: center;
}

.shared-seam__boundary {
  align-items: center;
  text-align: center;
}

.shared-seam__boundary span {
  font-family: var(--font-mono);
  font-size: var(--micro);
  font-weight: 700;
  letter-spacing: 0.1em;
}

.shared-seam__boundary i {
  width: 100%;
  margin: 0.75rem 0;
  border-top: 1px dashed var(--outside-accent);
}

.shared-seam__boundary p {
  color: var(--outside-muted);
  text-transform: none;
  letter-spacing: 0;
}

.outside-nav {
  position: sticky;
  z-index: 20;
  top: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(0, 1fr));
  margin-top: 2rem;
  border-block: 1px solid var(--outside-ink);
  background: rgba(243, 243, 239, 0.96);
}

.outside-nav a {
  padding: 0.8rem 1rem;
  border-right: 1px solid var(--outside-rule);
  font-family: var(--font-mono);
  font-size: var(--micro);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-align: center;
  text-decoration: none;
}

.outside-nav a:last-child {
  border-right: 0;
}

.outside-nav a:hover,
.outside-nav a:focus-visible {
  color: var(--outside-accent-hover);
  text-decoration: underline;
}

.outside-section {
  scroll-margin-top: 6rem;
  padding-block: clamp(4rem, 8vw, 7rem);
  border-top: 1px solid var(--outside-ink);
}

.outside-nav + .outside-section {
  border-top: 0;
}

.section-marker {
  display: grid;
  grid-template-columns: minmax(7rem, 0.3fr) minmax(0, 1.7fr);
  gap: 2rem;
  margin-bottom: clamp(2rem, 5vw, 4rem);
}

.section-marker h2 {
  max-width: 54rem;
  margin: 0;
  font-size: clamp(1.75rem, 3vw, 2.75rem);
  line-height: 1.18;
}

.section-marker div > p {
  max-width: 48rem;
  margin: 0.8rem 0 0;
  color: var(--outside-muted);
}

.zone-rail-wrap {
  margin-bottom: 1rem;
}

.zone-rail {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(13rem, 18rem);
  gap: 0.75rem;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  scroll-snap-type: inline proximity;
  scrollbar-color: var(--outside-ink) transparent;
  padding-bottom: 0.75rem;
}

.zone-tab {
  scroll-snap-align: start;
  min-width: 0;
  padding: 0;
  border: 1px solid var(--outside-rule);
  background: transparent;
  color: inherit;
  cursor: pointer;
  text-align: left;
}

.zone-tab img {
  width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  filter: grayscale(0.85);
  opacity: 0.68;
}

.zone-tab__copy {
  display: grid;
  gap: 0.15rem;
  min-height: 5rem;
  padding: 0.75rem;
}

.zone-tab__copy strong {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 500;
}

.zone-tab__copy small {
  color: var(--outside-muted);
}

.zone-tab:hover img,
.zone-tab:focus-visible img,
.zone-tab[aria-selected="true"] img {
  filter: none;
  opacity: 1;
}

.zone-tab[aria-selected="true"] {
  border-color: var(--outside-accent);
  background: var(--outside-surface);
}

.zone-tab[aria-selected="true"] .zone-tab__number {
  color: var(--outside-accent);
}

.rail-note {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin: 0;
  color: var(--outside-muted);
  font-family: var(--font-mono);
  font-size: var(--micro);
}

.zone-stage {
  border: 1px solid var(--outside-ink);
  background: var(--outside-surface);
}

.zone-stage__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 2rem;
  align-items: end;
  padding: clamp(1.25rem, 3vw, 2rem);
}

.zone-stage__head h3 {
  max-width: 54rem;
  margin: 0.3rem 0 0;
  font-size: clamp(1.5rem, 2.8vw, 2.4rem);
  line-height: 1.15;
}

.zone-stage__head p:last-child {
  max-width: 43rem;
  margin: 0.75rem 0 0;
  color: var(--outside-muted);
}

.zone-stage__count {
  font-family: var(--font-mono);
  font-size: var(--meta);
  color: var(--outside-muted);
}

.zone-visual {
  margin: 0;
  border-top: 1px solid var(--outside-rule);
  border-bottom: 1px solid var(--outside-rule);
  background: #e8e8e2;
}

.image-open {
  position: relative;
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  cursor: zoom-in;
}

.image-open img {
  width: 100%;
  max-height: min(68vh, 50rem);
  object-fit: contain;
}

.image-open__label {
  position: absolute;
  right: 1rem;
  bottom: 1rem;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--outside-ink);
  background: rgba(251, 251, 248, 0.94);
  font-family: var(--font-mono);
  font-size: var(--micro);
  font-weight: 700;
}

.zone-visual figcaption {
  padding: 0.65rem 1rem;
  color: var(--outside-muted);
  font-size: var(--meta);
}

.zone-stage__reading {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.reading-block {
  min-width: 0;
  padding: clamp(1.25rem, 3vw, 2rem);
  border-right: 1px solid var(--outside-rule);
}

.reading-block:nth-child(even),
.zone-stage__reading .reading-block:last-child {
  border-right: 0;
}

.reading-block--question {
  grid-column: 1 / -1;
  border-right: 0;
  border-bottom: 1px solid var(--outside-rule);
}

.reading-label {
  color: var(--outside-muted);
}

.reading-label--observed {
  color: var(--outside-sage);
}

.reading-label--proposal {
  color: #3c5b94;
}

.reading-block p:last-child {
  max-width: 42rem;
  margin: 0.6rem 0 0;
}

.zone-stage__actions {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1.25rem, 3vw, 2rem);
  border-top: 1px solid var(--outside-rule);
}

.zone-step,
.public-source-link,
.image-dialog button {
  min-height: 2.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--outside-rule);
  background: transparent;
  color: inherit;
  font: inherit;
  font-size: var(--meta);
  font-weight: 700;
  text-decoration: none;
}

.zone-step {
  cursor: pointer;
}

.zone-step:hover,
.zone-step:focus-visible,
.public-source-link:hover,
.public-source-link:focus-visible,
.image-dialog button:hover,
.image-dialog button:focus-visible {
  border-color: var(--outside-accent);
  color: var(--outside-accent-hover);
}

.interface-icon {
  width: 1rem;
  height: 1rem;
  flex: 0 0 auto;
}

.interface-icon--back {
  transform: rotate(180deg);
}

.evidence-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.evidence-panel {
  border: 1px solid var(--outside-rule);
  background: var(--outside-surface);
}

.evidence-panel__head {
  padding: 1.25rem;
  border-bottom: 1px solid var(--outside-rule);
}

.evidence-panel__head p {
  color: var(--outside-accent);
}

.evidence-panel h3 {
  margin: 0.25rem 0 0;
  font-size: 1.35rem;
}

.object-card,
.material-card {
  display: grid;
  grid-template-columns: minmax(10rem, 0.7fr) minmax(0, 1.3fr);
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--outside-rule);
  transition: border-color 150ms ease-out, background 150ms ease-out;
}

.object-card:last-child,
.material-card:last-child {
  border-bottom: 0;
}

.object-card.is-current,
.material-card.is-current {
  border-left: 3px solid var(--outside-accent);
  background: #f5f6fa;
}

.object-card h4,
.material-card h4 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 500;
}

.object-card p,
.material-card p {
  margin: 0;
  color: var(--outside-muted);
  font-size: var(--small);
}

.zone-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-top: 0.6rem;
}

.zone-tag {
  padding: 0.15rem 0.35rem;
  border: 1px solid var(--outside-rule);
  font-family: var(--font-mono);
  font-size: 0.6rem;
}

.material-chip {
  width: 100%;
  height: 1rem;
  margin-bottom: 0.6rem;
  border: 1px solid rgba(23, 24, 26, 0.35);
  background: var(--material-color, var(--outside-rule));
}

[data-material-id="material-vermilion"] { --material-color: #c7552c; }
[data-material-id="material-forest-green"] { --material-color: #3d5c49; }
[data-material-id="material-deep-blue"] { --material-color: #24578b; }
[data-material-id="material-ochre"] { --material-color: #a26d2d; }
[data-material-id="material-lavender"] { --material-color: #7354a2; }

.image-dialog {
  width: min(96vw, 96rem);
  max-width: none;
  max-height: 94vh;
  padding: 0;
  border: 1px solid var(--outside-ink);
  background: var(--outside-surface);
  color: var(--outside-ink);
}

.image-dialog::backdrop {
  background: rgba(23, 24, 26, 0.74);
}

.image-dialog__surface {
  min-height: 0;
}

.image-dialog header {
  min-height: 4.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--outside-rule);
}

.image-dialog header p {
  color: var(--outside-accent);
}

.image-dialog h2 {
  margin: 0.1rem 0 0;
  font-size: 1.25rem;
}

.image-dialog figure {
  margin: 0;
}

.image-dialog img {
  width: 100%;
  max-height: calc(94vh - 8rem);
  object-fit: contain;
  background: #e8e8e2;
}

.image-dialog figcaption {
  padding: 0.7rem 1rem;
  color: var(--outside-muted);
  font-size: var(--meta);
}

.outside-footer {
  min-height: 6rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid var(--outside-ink);
  font-family: var(--font-mono);
  font-size: var(--micro);
  letter-spacing: 0.08em;
}

.zone-tab:focus-visible,
.zone-stage:focus-visible,
.image-open:focus-visible,
.outside-page a:focus-visible,
.outside-page button:focus-visible {
  outline: 3px solid var(--outside-accent);
  outline-offset: 3px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 62rem) {
  .outside-hero,
  .section-marker,
  .shared-seam {
    grid-template-columns: 1fr;
  }

  .shared-seam__side--outside,
  .shared-seam__side--inside {
    border: 0;
  }

  .shared-seam__side--outside {
    border-bottom: 1px solid var(--outside-rule);
  }

  .shared-seam__side--inside {
    border-top: 1px solid var(--outside-rule);
  }

  .shared-seam__boundary {
    min-height: 8rem;
  }

  .shared-seam__side--outside > p,
  .shared-seam__side--inside > p {
    text-align: center;
  }

  .evidence-layout {
    grid-template-columns: 1fr;
  }

  .zone-stage__head {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 42rem) {
  .outside-page {
    --outside-shell: calc(100% - 2rem);
  }

  .outside-header {
    align-items: flex-start;
    padding-block: 1rem;
  }

  .outside-header__meta {
    display: block;
    text-align: right;
  }

  .outside-header__meta span {
    margin-bottom: 0.35rem;
  }

  .outside-hero {
    padding-block: 3rem;
  }

  .outside-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .outside-nav a:nth-child(2) {
    border-right: 0;
  }

  .outside-nav a:nth-child(-n + 2) {
    border-bottom: 1px solid var(--outside-rule);
  }

  .outside-section {
    padding-block: 4rem;
  }

  .section-marker {
    gap: 0.6rem;
  }

  .zone-rail {
    grid-auto-columns: minmax(12rem, 76vw);
  }

  .rail-note {
    display: block;
  }

  .rail-note span {
    display: block;
  }

  .zone-stage__reading {
    grid-template-columns: 1fr;
  }

  .reading-block,
.reading-block:nth-child(even),
.zone-stage__reading .reading-block:last-child {
    border-right: 0;
    border-bottom: 1px solid var(--outside-rule);
  }

  .zone-stage__reading .reading-block:last-child {
    border-bottom: 0;
  }

  .object-card,
  .material-card {
    grid-template-columns: 1fr;
  }

  .zone-stage__actions,
  .outside-footer {
    align-items: stretch;
    flex-direction: column;
  }

  .zone-step,
  .public-source-link {
    width: 100%;
  }

  .image-open__label {
    right: 0.5rem;
    bottom: 0.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .outside-page *,
  .outside-page *::before,
  .outside-page *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}