.page-about {
  background: var(--bg-ink);
  color: var(--text-cream);
  min-height: 100vh;
}

.page-about .about-shell {
  padding-top: 24px;
  padding-bottom: 72px;
}

.page-about .about-breadcrumb {
  margin-bottom: 32px;
}

.page-about .about-hero {
  display: grid;
  gap: 28px;
  padding: 32px 0 48px;
  border-bottom: 1px solid var(--line-faint);
  margin-bottom: 48px;
}

.page-about .about-hero-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.page-about .about-hero-kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 18px;
  font-family: var(--font-code);
  font-size: 13px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted-amber);
}

.page-about .about-hero-title {
  margin: 0 0 22px;
  font-size: clamp(26px, 4.4vw, 44px);
  line-height: 1.24;
  font-weight: 900;
  letter-spacing: -0.02em;
  max-width: 12em;
}

.page-about .about-hero-lead {
  margin: 0 0 24px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(236, 219, 186, .86);
  max-width: 44em;
}

.page-about .about-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-status-card {
  background: var(--bg-card);
  border: 1px solid var(--line-faint);
  border-radius: 12px;
  padding: 24px;
  box-shadow: var(--shadow-panel);
}

.page-about .about-status-card-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
}

.page-about .about-status-card-title {
  font-size: 15px;
  font-weight: 700;
}

.page-about .about-status-card-code {
  margin-left: auto;
  font-family: var(--font-code);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--accent-green);
}

.page-about .about-status-list {
  margin: 0;
  padding: 0;
}

.page-about .about-status-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-faint);
}

.page-about .about-status-row:last-child {
  border-bottom: 0;
}

.page-about .about-status-row dt {
  font-size: 13px;
  color: rgba(236, 219, 186, .8);
}

.page-about .about-status-row dd {
  margin: 0;
  font-family: var(--font-code);
  font-size: 12px;
  color: var(--accent-green);
  white-space: nowrap;
}

.page-about .about-status-foot {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line-faint);
  font-size: 12px;
  color: rgba(236, 219, 186, .5);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .about-main {
  min-width: 0;
}

.page-about .about-index {
  margin-bottom: 8px;
}

.page-about .about-index-label {
  display: none;
}

.page-about .about-index-list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.page-about .about-index-list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index-list li {
  flex: 0 0 auto;
}

.page-about .about-index-list a {
  display: block;
  padding: 8px 14px;
  border: 1px solid var(--line-faint);
  border-radius: 999px;
  background: var(--bg-card);
  color: rgba(236, 219, 186, .75);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: border-color .18s ease, color .18s ease;
}

.page-about .about-index-list a:hover,
.page-about .about-index-list a.is-active {
  color: var(--accent-green);
  border-color: var(--accent-green);
}

.page-about .about-index-meta {
  display: none;
}

.page-about .about-section {
  padding-bottom: 56px;
  scroll-margin-top: 110px;
}

.page-about .about-section + .about-section {
  border-top: 1px solid var(--line-faint);
  padding-top: 48px;
}

.page-about .about-section-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}

.page-about .about-section-title {
  position: relative;
  margin: 0;
  padding-bottom: 10px;
  font-size: 28px;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--text-cream);
}

.page-about .about-section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 36px;
  height: 3px;
  background: var(--accent-red);
}

.page-about .about-section-lead {
  margin: -8px 0 24px;
  font-size: 15px;
  line-height: 1.75;
  max-width: 46em;
  color: rgba(236, 219, 186, .75);
}

.page-about .about-origin-grid,
.page-about .about-region-grid {
  display: grid;
  gap: 28px;
}

.page-about .about-origin-copy p,
.page-about .about-region-copy p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(236, 219, 186, .85);
}

.page-about .about-origin-copy p:last-child,
.page-about .about-region-copy p:last-child {
  margin-bottom: 0;
}

.page-about .about-origin-figure,
.page-about .about-region-figure,
.page-about .about-timeline-figure {
  margin: 0;
  border: 1px solid var(--line-faint);
  border-radius: 12px;
  overflow: hidden;
  background: var(--bg-card);
}

.page-about .about-origin-figure img,
.page-about .about-region-figure img,
.page-about .about-timeline-figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-origin-figure figcaption,
.page-about .about-region-figure figcaption {
  padding: 12px 16px;
  font-family: var(--font-code);
  font-size: 12px;
  color: rgba(236, 219, 186, .65);
  border-top: 1px solid var(--line-faint);
}

.page-about .about-timeline-figure {
  margin-bottom: 28px;
}

.page-about .about-timeline {
  position: relative;
  margin: 24px 0 0;
  padding-left: 28px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--line-faint);
}

.page-about .about-timeline-item {
  position: relative;
}

.page-about .about-timeline-item summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  border-bottom: 1px solid rgba(74, 63, 58, .5);
}

.page-about .about-timeline-item summary::-webkit-details-marker {
  display: none;
}

.page-about .about-timeline-marker {
  position: absolute;
  left: -31px;
  top: 20px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 0 4px rgba(197, 240, 74, .12);
}

.page-about .about-timeline-phase {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-cream);
}

.page-about .about-timeline-desc {
  flex: 1 1 100%;
  margin-left: 24px;
  font-size: 13px;
  line-height: 1.5;
  color: rgba(236, 219, 186, .6);
}

.page-about .about-timeline-toggle {
  margin-left: auto;
  font-family: var(--font-code);
  font-size: 18px;
  line-height: 1;
  color: var(--accent-blue);
  transition: transform .18s ease;
}

.page-about .about-timeline-item[open] .about-timeline-toggle {
  transform: rotate(45deg);
}

.page-about .about-timeline-body {
  padding: 0 0 18px 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(236, 219, 186, .8);
}

.page-about .about-timeline-body p {
  margin: 0;
}

.page-about .about-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line-faint);
  border-radius: 10px;
  background: var(--bg-card);
}

.page-about .about-tool-table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
  font-family: var(--font-code);
  font-size: 13px;
  color: var(--text-cream);
}

.page-about .about-tool-table th {
  padding: 14px 16px;
  text-align: left;
  font-weight: 700;
  color: var(--accent-green);
  border-bottom: 2px solid var(--line-faint);
  white-space: nowrap;
  background: rgba(26, 22, 24, .5);
}

.page-about .about-tool-table td {
  padding: 14px 16px;
  vertical-align: top;
  line-height: 1.55;
  border-bottom: 1px solid var(--line-faint);
}

.page-about .about-tool-table tbody tr {
  transition: background .18s ease, box-shadow .18s ease;
}

.page-about .about-tool-table tbody tr:hover {
  background: rgba(197, 240, 74, .07);
  box-shadow: inset 3px 0 0 var(--accent-green);
}

.page-about .about-table-note {
  display: flex;
  gap: 12px;
  margin-top: 16px;
  padding: 16px;
  border-left: 3px solid var(--accent-green);
  border-radius: 0 8px 8px 0;
  background: rgba(26, 22, 26, .55);
}

.page-about .about-table-note p {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(236, 219, 186, .75);
}

.page-about .about-crane-mark {
  width: 96px;
  margin-top: 20px;
  color: var(--muted-amber);
  opacity: .9;
}

.page-about .about-crane-mark svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-service-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}

.page-about .about-service-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--line-faint);
  border-radius: 10px;
}

.page-about .about-service-icon {
  font-family: var(--font-code);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent-blue);
}

.page-about .about-service-card h3 {
  margin: 4px 0 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-cream);
}

.page-about .about-service-card p {
  margin: 0;
  font-family: var(--font-code);
  font-size: 14px;
  color: var(--accent-green);
  word-break: break-all;
}

.page-about .about-service-tagline {
  font-size: 12px;
  color: rgba(236, 219, 186, .55);
}

.page-about .about-service-note {
  margin-top: 20px;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--line-faint);
  border-radius: 12px;
}

.page-about .about-service-note-main {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.page-about .about-service-note-main p {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-cream);
}

.page-about .about-service-boundary {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(236, 219, 186, .68);
}

.page-about .about-service-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-next {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  margin-top: 48px;
  padding: 28px;
  border: 1px solid var(--line-faint);
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(240, 75, 50, .08), rgba(197, 240, 74, .04)), var(--bg-card);
}

.page-about .about-next-copy p {
  margin: 6px 0 0;
  font-size: 15px;
  color: var(--text-cream);
}

.page-about .about-next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.page-about .about-next-links a {
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(59, 130, 246, .3);
  color: var(--accent-blue);
  text-decoration: none;
  font-family: var(--font-code);
  font-size: 14px;
  transition: color .18s ease, border-color .18s ease;
}

.page-about .about-next-links a:hover {
  color: var(--accent-green);
  border-color: var(--accent-green);
}

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: 1.15fr .85fr;
    align-items: center;
    gap: 48px;
    padding: 48px 0 64px;
  }

  .page-about .about-layout {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 132px;
    align-self: start;
    margin-bottom: 0;
  }

  .page-about .about-index-label {
    display: block;
    margin: 0 0 16px;
    font-family: var(--font-code);
    font-size: 11px;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: rgba(236, 219, 186, .45);
  }

  .page-about .about-index-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index-list li {
    flex: auto;
  }

  .page-about .about-index-list a {
    padding: 10px 0;
    border: none;
    border-bottom: 1px solid rgba(74, 63, 58, .5);
    border-radius: 0;
    background: transparent;
    font-size: 14px;
    white-space: normal;
  }

  .page-about .about-index-list a:hover,
  .page-about .about-index-list a.is-active {
    padding-left: 8px;
    color: var(--accent-green);
    border-color: rgba(197, 240, 74, .3);
  }

  .page-about .about-index-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 20px;
    font-family: var(--font-code);
    font-size: 12px;
    color: rgba(236, 219, 186, .45);
  }

  .page-about .about-index-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-green);
  }

  .page-about .about-origin-grid,
  .page-about .about-region-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
  }

  .page-about .about-origin-figure {
    margin-top: 4px;
  }

  .page-about .about-timeline-item summary {
    display: grid;
    grid-template-columns: 14px auto 1fr auto;
    align-items: baseline;
  }

  .page-about .about-timeline-desc {
    flex: none;
    margin-left: 0;
  }

  .page-about .about-timeline-toggle {
    margin-left: 0;
  }

  .page-about .about-service-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-service-note {
    padding: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [class*="about-"] {
    transition: none !important;
    scroll-behavior: auto !important;
  }
}