.page-about {
  font-family: var(--font-body);
  color: var(--text-bright);
  overflow-wrap: break-word;
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 4px solid var(--accent-mint);
  outline-offset: 2px;
}

.page-about-breadcrumb {
  max-width: 1320px;
  margin-left: auto;
  margin-right: auto;
  padding: 24px 20px 0;
  color: var(--text-dim);
  font-size: 14px;
}

.page-about-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about-breadcrumb a {
  color: var(--accent-mint);
  text-decoration: none;
}

.page-about-breadcrumb a:hover {
  text-decoration: underline;
}

.page-about-breadcrumb .crumb-current {
  color: var(--text-dim);
}

.page-about-hero {
  position: relative;
  display: grid;
  gap: 28px;
  max-width: 1320px;
  margin-left: auto;
  margin-right: auto;
  padding: 48px 20px 0;
  overflow: hidden;
}

.page-about-hero::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -40px;
  width: 320px;
  height: 200px;
  background:
    linear-gradient(160deg, transparent 40%, rgba(27, 77, 62, 0.55) 41%, rgba(27, 77, 62, 0.55) 43%, transparent 44%),
    linear-gradient(190deg, transparent 66%, rgba(0, 229, 160, 0.2) 67%, rgba(0, 229, 160, 0.2) 69%, transparent 70%);
  pointer-events: none;
  opacity: 0.6;
}

.page-about-hero__inner {
  position: relative;
  z-index: 1;
  min-width: 0;
}

.page-about-hero__kick {
  font-family: var(--font-data);
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-mint);
  border: 1px solid var(--accent-mint);
  display: inline-block;
  padding: 6px 10px;
  margin: 0 0 18px;
}

.page-about-hero h1 {
  font-family: var(--font-title);
  font-size: clamp(36px, 8vw, 68px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  font-weight: 800;
  margin: 0 0 20px;
  color: var(--text-bright);
}

.page-about-hero__lead {
  font-size: 17px;
  line-height: 1.85;
  color: var(--text-dim);
  max-width: 58ch;
  margin: 0;
}

.page-about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about-hero__map {
  position: relative;
  z-index: 1;
  min-width: 0;
  margin: 0;
}

.page-about-hero__map img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 4px solid var(--border-steel);
  box-shadow: var(--shadow-panel);
}

.page-about-summary {
  position: relative;
  margin-top: 48px;
}

.page-about-file {
  position: relative;
  background: var(--panel-light);
  color: var(--bg-deep);
  border: 4px solid var(--border-steel);
  border-top: 8px solid var(--accent-mint);
  box-shadow: var(--shadow-panel);
  padding: 24px;
}

.page-about-file__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  border-bottom: 2px dashed var(--border-steel);
  padding-bottom: 16px;
  margin-bottom: 20px;
}

.page-about-file__head h2 {
  font-family: var(--font-title);
  font-size: 28px;
  line-height: 1.2;
  margin: 0;
  color: var(--bg-deep);
}

.page-about-file__body {
  display: grid;
  gap: 24px;
}

.page-about-file__summary {
  font-size: 16px;
  line-height: 1.85;
  margin: 0;
  color: var(--bg-deep);
}

.page-about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
}

.page-about-stats div {
  border-left: 4px solid var(--accent-mint);
  padding-left: 12px;
  min-width: 0;
}

.page-about-stats dt {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--border-steel);
  margin-bottom: 4px;
}

.page-about-stats dd {
  font-family: var(--font-data);
  font-size: 26px;
  font-weight: 700;
  color: var(--bg-deep);
  margin: 0;
}

.page-about-file__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  border-top: 2px dashed var(--border-steel);
  padding-top: 20px;
  margin-top: 24px;
}

.page-about-file__note {
  font-size: 14px;
  line-height: 1.6;
  color: var(--border-steel);
  max-width: 52ch;
}

.page-about-section-head {
  display: flex;
  align-items: flex-end;
  gap: 14px;
  margin-bottom: 28px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--border-steel);
}

.page-about-section-head__idx {
  font-family: var(--font-data);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  color: var(--accent-violet);
  border: 2px solid var(--accent-violet);
  padding: 8px 6px;
}

.page-about-section-head h2 {
  font-family: var(--font-title);
  font-size: 32px;
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--text-bright);
}

.page-about-section-head p:not(.page-about-section-head__idx) {
  margin: 6px 0 0;
  color: var(--text-dim);
}

.page-about-timeline-section {
  position: relative;
  margin-top: 56px;
}

.page-about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 28px;
}

.page-about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.page-about-timeline__item:not(:last-child)::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 48px;
  bottom: -28px;
  width: 4px;
  background: var(--border-steel);
}

.page-about-timeline__node {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 15px;
  border: 4px solid var(--border-steel);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.28);
  background: var(--accent-violet);
  color: var(--text-bright);
  position: relative;
  z-index: 2;
}

.page-about-timeline__item:nth-child(odd) .page-about-timeline__node {
  background: var(--accent-mint);
  color: var(--bg-deep);
}

.page-about-timeline__item:nth-child(4) .page-about-timeline__node {
  background: var(--accent-violet);
  color: var(--text-bright);
}

.page-about-timeline__item:nth-child(5) .page-about-timeline__node {
  background: var(--accent-amber);
  color: var(--bg-deep);
}

.page-about-timeline__card {
  min-width: 0;
  background: var(--panel-light);
  color: var(--bg-deep);
  border: 4px solid var(--border-steel);
  box-shadow: var(--shadow-panel);
  padding: 20px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about-timeline__card h3 {
  font-family: var(--font-title);
  font-size: 20px;
  line-height: 1.3;
  margin: 0 0 10px;
  color: var(--bg-deep);
}

.page-about-timeline__card p:last-child {
  margin-bottom: 0;
  line-height: 1.75;
  color: var(--border-steel);
}

.page-about-timeline__card:hover {
  transform: translateX(8px);
  box-shadow: 10px 10px 0 rgba(0, 0, 0, 0.3);
}

.page-about-workflow {
  position: relative;
  margin-top: 64px;
}

.page-about-workflow__map {
  margin: 0 0 28px;
}

.page-about-workflow__map img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 4px solid var(--border-steel);
  box-shadow: var(--shadow-panel);
  background: var(--pitch-green);
}

.page-about-workflow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about-workflow__steps li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 20px;
  background: rgba(242, 245, 248, 0.05);
  border: 1px solid var(--border-steel);
  border-left: 4px solid var(--accent-mint);
}

.page-about-workflow__num {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 14px;
  line-height: 1;
  color: var(--accent-mint);
  border-bottom: 2px solid var(--accent-mint);
  padding-bottom: 4px;
}

.page-about-workflow__steps h3 {
  font-family: var(--font-title);
  font-size: 18px;
  margin: 0 0 6px;
  color: var(--text-bright);
}

.page-about-workflow__steps p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about-workflow__detail {
  margin-top: 24px;
  border: 2px solid var(--border-steel);
  background: rgba(140, 124, 255, 0.08);
  color: var(--text-bright);
}

.page-about-workflow__detail summary {
  cursor: pointer;
  padding: 16px 20px;
  font-family: var(--font-data);
  font-weight: 700;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

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

.page-about-workflow__detail summary::after {
  content: "+";
  font-size: 22px;
  color: var(--accent-violet);
  line-height: 1;
}

.page-about-workflow__detail[open] summary::after {
  content: "–";
  color: var(--accent-mint);
}

.page-about-workflow__detail p {
  margin: 0;
  padding: 0 20px 20px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about-hunan {
  margin-top: 64px;
}

.page-about-hunan__card {
  display: grid;
  gap: 28px;
  padding: 24px;
  background: linear-gradient(145deg, rgba(27, 77, 62, 0.45), rgba(11, 15, 25, 0.88)), var(--bg-deep);
  border: 4px solid var(--border-steel);
  box-shadow: var(--shadow-panel);
}

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

.page-about-hunan__copy h2 {
  font-family: var(--font-title);
  font-size: 32px;
  line-height: 1.15;
  margin: 14px 0 16px;
  color: var(--text-bright);
}

.page-about-hunan__copy p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-dim);
  margin: 0 0 16px;
}

.page-about-hunan__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about-hunan__figure {
  min-width: 0;
  margin: 0;
}

.page-about-hunan__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 4px solid var(--border-steel);
  box-shadow: var(--shadow-panel);
}

@media (min-width: 900px) {
  .page-about-hero {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: center;
    padding-top: 64px;
    gap: 40px;
  }

  .page-about-hero__map {
    margin-bottom: 0;
  }

  .page-about-file {
    padding: 36px;
  }

  .page-about-file__body {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: 40px;
    align-items: start;
  }

  .page-about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about-timeline__item {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 24px;
  }

  .page-about-timeline__node {
    width: 64px;
    height: 64px;
    font-size: 18px;
  }

  .page-about-timeline__item:not(:last-child)::before {
    left: 30px;
    top: 64px;
    bottom: -28px;
  }

  .page-about-timeline__card {
    padding: 24px;
  }

  .page-about-workflow__steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about-workflow__steps li {
    flex-direction: column;
  }

  .page-about-hunan__card {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 40px;
    align-items: center;
    padding: 36px;
  }
}