.page-about {
  --archive-index-w: 240px;
  --timeline-col: 32px;
  --timeline-node-size: 14px;
  --timeline-line-width: 2px;
  scroll-behavior: smooth;
}

.page-about .archive-hero {
  position: relative;
  padding: 32px 0 48px;
  overflow: hidden;
}

.page-about .archive-hero__grid {
  display: grid;
  gap: 32px;
  align-items: center;
}

.page-about .archive-hero__label {
  display: inline-flex;
  margin-bottom: 16px;
}

.page-about .archive-hero h1 {
  font-family: var(--f-display);
  font-size: clamp(1.7rem, 5vw, 2.5rem);
  line-height: 1.22;
  color: var(--c-text);
  margin: 0 0 16px;
  max-width: 680px;
}

.page-about .archive-hero__lead {
  color: var(--c-muted);
  font-size: 1rem;
  line-height: 1.8;
  max-width: 58ch;
  margin: 0 0 24px;
}

.page-about .archive-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .archive-hero__visual {
  position: relative;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--c-line);
  background: var(--c-bg-soft);
}

.page-about .archive-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .archive-layout {
  display: grid;
  gap: 28px;
  padding: 24px 0 64px;
}

.page-about .archive-index {
  position: relative;
}

.page-about .archive-index__inner {
  background: var(--c-bg);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-m);
  padding: 16px;
}

.page-about .archive-index__kicker {
  display: block;
  font-family: var(--f-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-muted);
  margin-bottom: 12px;
}

.page-about .archive-index__nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: none;
}

.page-about .archive-index__nav::-webkit-scrollbar {
  display: none;
}

.page-about .archive-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--c-bg-soft);
  border-radius: 99px;
  color: var(--c-text);
  text-decoration: none;
  font-size: 0.84rem;
  white-space: nowrap;
  border: 1px solid transparent;
  transition: border-color 0.2s var(--ease-out), background-color 0.2s var(--ease-out);
}

.page-about .archive-index__link:hover,
.page-about .archive-index__link:focus-visible {
  border-color: var(--c-accent);
  background: rgba(255, 107, 53, 0.08);
}

.page-about .archive-index__num {
  font-family: var(--f-mono);
  font-size: 0.7rem;
  color: var(--c-accent);
}

.page-about .archive-index__meta {
  display: none;
}

.page-about .archive-content {
  display: grid;
  gap: 28px;
}

.page-about .archive-card {
  background: var(--c-bg);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-l);
  padding: 24px 20px;
  position: relative;
  overflow: hidden;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .archive-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--grad-accent);
  opacity: 0.8;
}

.page-about .archive-card__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}

.page-about .archive-card__code {
  font-family: var(--f-mono);
  font-size: 0.7rem;
  color: var(--c-muted);
  letter-spacing: 0.1em;
}

.page-about .archive-card__head h2 {
  font-family: var(--f-display);
  font-size: 1.3rem;
  color: var(--c-text);
  margin: 0;
}

.page-about .archive-card__body {
  color: var(--c-muted);
  line-height: 1.75;
  font-size: 0.95rem;
}

.page-about .archive-card__body p {
  margin: 0 0 12px;
  max-width: 66ch;
}

.page-about .brand-feature-list {
  list-style: none;
  padding: 0;
  margin: 20px 0 0;
  display: grid;
  gap: 10px;
}

.page-about .brand-feature-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 12px;
  background: var(--c-bg-soft);
  border-radius: var(--radius-s);
  border: 1px solid var(--c-line);
  transition: border-color 0.2s var(--ease-out);
}

.page-about .brand-feature-list li:hover {
  border-color: var(--c-accent);
}

.page-about .brand-feature-list__name {
  color: var(--c-text);
  font-size: 0.9rem;
}

.page-about .timeline {
  position: relative;
  display: grid;
  gap: 16px;
  margin: 24px 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 8px;
  bottom: 8px;
  width: var(--timeline-line-width);
  transform: translateX(-50%);
  background: linear-gradient(
    to bottom,
    var(--c-teal) 0%,
    var(--c-teal) 25%,
    var(--c-accent) 25%,
    var(--c-accent) 50%,
    var(--c-teal) 50%,
    var(--c-teal) 75%,
    var(--c-gold) 75%
  );
  border-radius: 99px;
  opacity: 0.6;
}

.page-about .timeline__item {
  display: grid;
  grid-template-columns: var(--timeline-col) 1fr;
  gap: 16px;
  align-items: start;
}

.page-about .timeline__node {
  justify-self: center;
  width: var(--timeline-node-size);
  height: var(--timeline-node-size);
  border-radius: 50%;
  margin-top: 22px;
  background: var(--c-accent);
  border: 3px solid var(--c-bg-deep);
  box-shadow: 0 0 0 2px var(--c-accent);
}

.page-about .timeline__node--start {
  background: var(--c-teal);
  box-shadow: 0 0 0 2px var(--c-teal);
}

.page-about .timeline__item--v2022 .timeline__node {
  background: var(--c-teal);
  box-shadow: 0 0 0 2px var(--c-teal);
}

.page-about .timeline__item--v2025 .timeline__node {
  background: var(--c-gold);
  box-shadow: 0 0 0 2px var(--c-gold);
}

.page-about .timeline__panel,
.page-about .timeline__static {
  background: var(--c-bg-soft);
  border-radius: var(--radius-m);
  border: 1px solid var(--c-line);
  overflow: hidden;
}

.page-about .timeline__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  transition: background-color 0.2s var(--ease-out);
}

.page-about .timeline__summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline__summary:hover {
  background: rgba(255, 107, 53, 0.06);
}

.page-about .timeline__year {
  font-family: var(--f-mono);
  font-weight: 700;
  font-size: 1rem;
  color: var(--c-accent);
  background: rgba(255, 107, 53, 0.12);
  padding: 2px 8px;
  border-radius: 6px;
  flex-shrink: 0;
}

.page-about .timeline__item--v2018 .timeline__year {
  color: var(--c-teal);
  background: rgba(45, 212, 191, 0.12);
}

.page-about .timeline__item--v2022 .timeline__year {
  color: var(--c-teal);
  background: rgba(45, 212, 191, 0.12);
}

.page-about .timeline__item--v2025 .timeline__year {
  color: var(--c-gold);
  background: rgba(212, 175, 55, 0.12);
}

.page-about .timeline__title {
  font-weight: 600;
  color: var(--c-text);
  font-size: 0.95rem;
}

.page-about .timeline__toggle {
  margin-left: auto;
  font-family: var(--f-mono);
  font-size: 1.1rem;
  color: var(--c-muted);
  transition: transform 0.3s var(--ease-out);
  flex-shrink: 0;
}

.page-about .timeline__panel[open] .timeline__toggle {
  transform: rotate(45deg);
}

.page-about .timeline__detail {
  padding: 0 16px 16px;
  color: var(--c-muted);
  line-height: 1.7;
  font-size: 0.9rem;
}

.page-about .timeline__detail p {
  margin: 0 0 12px;
}

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

.page-about .timeline__static {
  padding: 14px 16px;
}

.page-about .timeline__static p {
  margin: 8px 0 0;
  font-size: 0.9rem;
  color: var(--c-muted);
  line-height: 1.7;
}

.page-about .milestone-visual {
  margin: 24px auto 0;
  max-width: 640px;
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid var(--c-line);
}

.page-about .milestone-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .service-zone-grid {
  display: grid;
  gap: 24px;
  margin-top: 20px;
}

.page-about .city-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.page-about .city-grid__city {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px 8px;
  min-height: 48px;
  background: var(--c-bg-soft);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-s);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--c-text);
  transition: transform 0.25s var(--ease-out), border-color 0.25s var(--ease-out);
}

.page-about .city-grid__city:hover,
.page-about .city-grid__city:focus-visible {
  transform: scale(1.05);
  border-color: var(--c-accent);
}

.page-about .city-grid__city--hot {
  border-color: var(--c-accent);
  background: rgba(255, 107, 53, 0.1);
  color: var(--c-accent);
}

.page-about .city-map-visual {
  margin: 0;
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid var(--c-line);
}

.page-about .city-map-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .service-note {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  padding: 12px 16px;
  background: rgba(45, 212, 191, 0.06);
  border-radius: var(--radius-s);
  border-left: 3px solid var(--c-teal);
}

.page-about .service-note__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-teal);
  flex-shrink: 0;
  box-shadow: 0 0 8px rgba(45, 212, 191, 0.8);
}

.page-about .service-note p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--c-muted);
}

.page-about .compliance-icp {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 20px;
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.12), rgba(255, 107, 53, 0.06));
  border: 1px solid rgba(212, 175, 55, 0.4);
  border-radius: var(--radius-m);
  margin-bottom: 20px;
}

.page-about .compliance-icp__badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--c-gold);
  color: var(--c-bg-deep);
  font-size: 1.6rem;
  font-weight: 900;
  font-family: var(--f-display);
  flex-shrink: 0;
}

.page-about .compliance-icp__info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .compliance-icp__info span {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--c-muted);
}

.page-about .compliance-icp__info strong {
  font-family: var(--f-mono);
  font-size: 1.1rem;
  color: var(--c-gold);
}

.page-about .compliance-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
}

.page-about .compliance-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--c-line);
}

.page-about .compliance-list li:last-child {
  border-bottom: none;
}

.page-about .compliance-list li > span:first-child {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  color: var(--c-muted);
  flex-shrink: 0;
}

.page-about .compliance-list li > span:last-child {
  color: var(--c-text);
  font-size: 0.9rem;
  text-align: right;
}

.page-about .archive-links {
  background: var(--c-bg);
  padding: 48px 0;
  border-top: 1px solid var(--c-line);
}

.page-about .archive-links h2 {
  font-family: var(--f-display);
  font-size: 1.5rem;
  color: var(--c-text);
  margin: 8px 0 24px;
}

.page-about .archive-links__grid {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

.page-about .archive-link-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: var(--c-bg-deep);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-m);
  text-decoration: none;
  color: var(--c-text);
  transition: transform 0.25s var(--ease-out), border-color 0.25s var(--ease-out), box-shadow 0.25s var(--ease-out);
}

.page-about .archive-link-card:hover,
.page-about .archive-link-card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--c-accent);
  box-shadow: var(--shadow);
}

.page-about .archive-link-card__code {
  font-family: var(--f-mono);
  font-size: 0.7rem;
  color: var(--c-muted);
  letter-spacing: 0.1em;
}

.page-about .archive-link-card strong {
  font-size: 1.05rem;
}

.page-about .archive-link-card__desc {
  color: var(--c-muted);
  font-size: 0.85rem;
}

@media (min-width: 900px) {
  .page-about .archive-hero {
    padding: 64px 0 72px;
  }

  .page-about .archive-hero__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 48px;
  }

  .page-about .archive-layout {
    grid-template-columns: var(--archive-index-w) 1fr;
    gap: 48px;
    padding-top: 36px;
    align-items: start;
  }

  .page-about .archive-index {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .archive-index__inner {
    padding: 20px;
  }

  .page-about .archive-index__kicker {
    margin-bottom: 16px;
  }

  .page-about .archive-index__nav {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .archive-index__link {
    display: flex;
    border-radius: var(--radius-s);
    padding: 10px 12px;
    white-space: normal;
    background: transparent;
    border: none;
    border-left: 2px solid transparent;
  }

  .page-about .archive-index__link:hover,
  .page-about .archive-index__link:focus-visible {
    background: var(--c-bg-soft);
    border-left-color: var(--c-accent);
  }

  .page-about .archive-index__meta {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--c-line);
  }

  .page-about .archive-index__meta span {
    font-family: var(--f-mono);
    font-size: 0.7rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--c-muted);
  }

  .page-about .archive-index__meta strong {
    font-family: var(--f-mono);
    font-size: 0.85rem;
    color: var(--c-gold);
  }

  .page-about .archive-content {
    gap: 48px;
  }

  .page-about .archive-card {
    padding: 40px 36px;
  }

  .page-about .archive-card__body {
    font-size: 1rem;
  }

  .page-about .brand-feature-list {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .service-zone-grid {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }

  .page-about .archive-links {
    padding: 64px 0;
  }

  .page-about .archive-links__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}