.page-about {
  --about-rail-w: 64px;
  --about-ink-muted: var(--c-mono);
  position: relative;
  overflow-x: clip;
  color: var(--c-ink);
  background: linear-gradient(180deg, var(--c-mist) 0, var(--c-cloud) 260px);
}

.page-about .about-wrap {
  width: min(100% - 2rem, 1180px);
  margin-inline: auto;
  padding: 1.5rem 0 4rem;
}

.page-about .breadcrumbs {
  margin-bottom: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}

.page-about .breadcrumbs .crumb-link {
  color: var(--c-mono);
  text-decoration: none;
}

.page-about .breadcrumbs .crumb-link:hover {
  color: var(--c-red);
}

.page-about .section-head {
  margin-bottom: 1.5rem;
}

.page-about .section-head h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(1.55rem, 3.2vw, 2.15rem);
  line-height: 1.2;
  color: var(--c-ink);
}

.page-about .about-hero {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 3rem;
  padding: 2rem 1.25rem;
  border: 1px solid var(--c-border);
  background:
    linear-gradient(135deg, rgba(232, 240, 254, 0.92), rgba(255, 255, 255, 0.7) 45%, rgba(253, 232, 232, 0.82)),
    var(--c-mist);
  box-shadow: var(--shadow-2);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -8%;
  bottom: -14px;
  width: 58%;
  height: 26px;
  background: linear-gradient(90deg, var(--c-red), var(--c-orange));
  transform: rotate(-2deg);
  z-index: 0;
  opacity: 0.85;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 8%;
  right: -24px;
  width: 120px;
  height: 120px;
  border: 2px dashed var(--c-border);
  border-radius: 50%;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-hero-copy,
.page-about .about-hero-aside {
  position: relative;
  z-index: 1;
}

.page-about .about-hero-copy .section-index {
  display: inline-block;
  margin-bottom: 0.75rem;
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--c-mono);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  background: var(--c-white);
  color: var(--c-mono);
}

.page-about .about-hero-copy h1 {
  margin: 0 0 0.9rem;
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.9rem);
  line-height: 1.18;
  color: var(--c-ink);
}

.page-about .about-hero-lead {
  max-width: 34em;
  margin: 0 0 1.5rem;
  font-size: 1rem;
  color: var(--c-mono);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-hero-aside {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 1rem;
}

.page-about .about-hero-tag {
  align-self: flex-start;
  padding: 0.35rem 0.7rem;
  border: 2px solid var(--c-ink);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--c-ink);
  transform: rotate(1deg);
  background: var(--c-white);
}

.page-about .about-hero-stamp {
  flex: 1;
  min-width: 150px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 1.1rem 0.8rem;
  border: 2px dashed var(--c-red);
  background: var(--c-dusk);
  text-align: center;
}

.page-about .about-hero-stamp-num {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--c-red);
  line-height: 1;
}

.page-about .about-hero-stamp-num small {
  font-size: 1.2rem;
}

.page-about .about-hero-stamp-label {
  margin-top: 0.35rem;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--c-mono);
}

.page-about .about-hero-code {
  width: 100%;
  padding: 0.6rem 0.8rem;
  border-left: 3px solid var(--c-tianshan);
  background: rgba(255, 255, 255, 0.7);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.8;
  color: var(--c-mono);
}

.page-about .about-hero-code-line {
  display: block;
}

.page-about .about-story {
  max-width: 940px;
  margin: 0 auto 3rem;
  padding: 1.75rem;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, var(--c-white), var(--c-cloud));
  box-shadow: var(--shadow-2);
}

.page-about .about-story-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: center;
}

.page-about .about-story-copy p {
  margin: 0 0 1rem;
  color: var(--c-mono);
}

.page-about .about-story-copy .tag {
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
}

.page-about .about-story-image {
  position: relative;
  border: 1px solid var(--c-border);
  padding: 0.4rem 0.4rem 2rem;
  background: var(--c-white);
  box-shadow: var(--shadow-1);
}

.page-about .about-story-image img,
.page-about .about-milestone-art img,
.page-about .about-partner-image img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-image-note {
  position: absolute;
  right: 0.75rem;
  bottom: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--c-mono);
}

.page-about .about-milestones {
  margin-bottom: 3rem;
}

.page-about .about-milestone-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: start;
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding-left: 1.2rem;
  border-left: 3px solid var(--c-tianshan);
}

.page-about .about-timeline-item {
  position: relative;
  margin-bottom: 1rem;
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
}

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: -1.7rem;
  top: 1.1rem;
  width: 0.65rem;
  height: 0.65rem;
  border: 3px solid var(--c-tianshan);
  border-radius: 50%;
  background: var(--c-white);
}

.page-about .about-timeline-trigger {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.75rem 1rem;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.page-about .about-timeline-year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--c-tianshan);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.page-about .about-timeline-title {
  flex: 1;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: var(--c-ink);
}

.page-about .about-timeline-arrow {
  color: var(--c-mono);
  font-family: var(--font-mono);
  font-size: 1rem;
  transition: transform 0.25s ease;
}

.page-about .about-timeline-item[data-open="true"] .about-timeline-arrow {
  transform: rotate(45deg);
  color: var(--c-red);
}

.page-about .about-timeline-panel {
  padding: 0 1rem 0.9rem 2rem;
  color: var(--c-mono);
  font-size: 0.92rem;
}

.page-about .about-milestone-art {
  position: relative;
  border: 1px solid var(--c-border);
  padding: 0.4rem 0.4rem 2rem;
  background: var(--c-white);
}

.page-about .about-data {
  margin-bottom: 3rem;
  padding: 2rem 1.5rem;
  background: linear-gradient(135deg, var(--c-tianshan), var(--c-ink));
  box-shadow: var(--shadow-2);
  color: var(--c-white);
}

.page-about .about-data-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-about .about-data-copy p {
  margin: 0 0 1rem;
  color: var(--c-cloud);
}

.page-about .about-data-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-about .about-data-tags .tag {
  border: 1px solid rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.12);
  color: var(--c-white);
}

.page-about .about-data-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.8rem;
}

.page-about .about-stat-card {
  border: 1px solid rgba(255, 255, 255, 0.35);
  background: rgba(255, 255, 255, 0.1);
  padding: 1rem 0.8rem;
  text-align: center;
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 800;
  line-height: 1.1;
  color: var(--c-white);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.8);
}

.page-about .about-partners {
  margin-bottom: 3rem;
}

.page-about .about-partner-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}

.page-about .about-license-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding: 1rem;
  border: 1px solid var(--c-border);
  border-left: 4px solid var(--c-green);
  background: var(--c-white);
}

.page-about .about-license-icon {
  width: 2.4rem;
  height: 2.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 2px solid var(--c-green);
  color: var(--c-green);
  font-family: var(--font-mono);
  font-size: 1.2rem;
  flex-shrink: 0;
}

.page-about .about-license-card h3,
.page-about .about-partner-item h3 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
}

.page-about .about-license-card p {
  margin: 0;
  font-family: var(--font-mono);
  color: var(--c-mono);
}

.page-about .about-partner-list {
  display: grid;
  gap: 1rem;
}

.page-about .about-partner-item {
  display: flex;
  gap: 1rem;
  padding: 1rem;
  border: 1px solid var(--c-border);
  background: var(--c-white);
}

.page-about .about-partner-index {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--c-orange);
}

.page-about .about-partner-item p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--c-mono);
}

.page-about .about-partner-image {
  position: relative;
  border: 1px solid var(--c-border);
  padding: 0.4rem 0.4rem 2rem;
  background: var(--c-white);
}

.page-about .about-culture {
  max-width: 780px;
  margin: 0 auto 3rem;
}

.page-about .about-culture-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-about .about-culture-note p {
  margin: 0 0 1rem;
  color: var(--c-mono);
}

.page-about .about-culture-values {
  display: grid;
  gap: 0.8rem;
}

.page-about .about-value {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.15rem 1rem;
  padding: 1rem;
  border: 1px solid var(--c-border);
  border-right: 4px solid var(--c-orange);
  background: var(--c-white);
}

.page-about .about-value-index {
  grid-row: span 2;
  font-family: var(--font-mono);
  color: var(--c-mono);
}

.page-about .about-value-title {
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .about-value-desc {
  font-size: 0.86rem;
  color: var(--c-mono);
}

.page-about .about-connect {
  max-width: 780px;
  margin: 3rem auto 0;
}

.page-about .about-connect-card {
  padding: 2rem 1.5rem;
  text-align: center;
  border: 2px dashed var(--c-border);
  background: linear-gradient(135deg, var(--c-dusk), var(--c-mist));
}

.page-about .about-connect-meta {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--c-mono);
}

.page-about .about-connect-card h2 {
  margin: 0 0 0.75rem;
  font-family: var(--font-heading);
  font-size: 1.6rem;
}

.page-about .about-connect-card p {
  margin: 0 0 1.2rem;
  color: var(--c-mono);
}

.page-about .about-connect-card .btn {
  margin: 0.25rem;
}

.page-about .about-rail {
  display: none;
}

@media (min-width: 768px) {
  .page-about .about-hero {
    display: grid;
    grid-template-columns: 1.4fr 0.6fr;
    gap: 2rem;
    padding: 2.5rem;
  }

  .page-about .about-hero-aside {
    flex-direction: column;
    justify-content: flex-end;
    align-items: flex-end;
  }

  .page-about .about-hero-stamp {
    min-width: 180px;
  }

  .page-about .about-hero-code {
    width: auto;
    min-width: 220px;
  }

  .page-about .about-story-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-milestone-layout {
    grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
  }

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

  .page-about .about-data-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-partner-layout {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }

  .page-about .about-culture-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .page-about .about-data {
    padding: 3rem 2.5rem;
  }

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

  .page-about .about-partners .about-partner-layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  }
}

@media (min-width: 1360px) {
  .page-about .about-rail {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.8rem;
    position: absolute;
    top: 150px;
    left: max(0.75rem, calc((100% - 1180px) / 2 - 68px));
    width: 48px;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.18em;
    color: var(--c-mono);
    text-transform: uppercase;
    writing-mode: vertical-rl;
    -webkit-writing-mode: vertical-rl;
    text-orientation: mixed;
  }

  .page-about .about-rail-line {
    width: 2px;
    height: 96px;
    flex: 0 0 auto;
    background: linear-gradient(180deg, var(--c-tianshan), var(--c-orange));
  }
}