.page-about {
  --archive-shadow: 12px 12px 0 rgba(0, 0, 0, 0.28);
  --timeline-line-clr: var(--clr-gold);
  --card-radius: 0;
  background: var(--clr-bg);
  color: var(--clr-paper);
}

.page-about .content-wrap {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-gutter);
}

.page-about .breadcrumb {
  margin: 0 auto 1.75rem;
  font-size: 0.9rem;
  color: var(--clr-gold);
}

.page-about .breadcrumb__link {
  color: var(--clr-gold);
  text-decoration: none;
  font-weight: 500;
}

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

.page-about .breadcrumb__sep {
  margin: 0 0.5rem;
  color: rgba(212, 175, 55, 0.5);
}

.page-about .breadcrumb__current {
  color: var(--clr-paper);
}

.page-about__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.5rem;
  max-width: 1320px;
  margin-inline: auto;
  padding-inline: var(--space-gutter);
  padding-bottom: 3rem;
}

/* 档案卡 */
.page-about .archive-card {
  background: var(--clr-paper);
  border: 2px solid var(--clr-gold);
  box-shadow: var(--archive-shadow);
  position: relative;
  overflow: hidden;
}

.page-about .archive-card__media {
  position: relative;
  height: 200px;
  overflow: hidden;
  border-bottom: 3px solid var(--clr-gold);
}

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

.page-about .archive-card__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 61, 42, 0.15) 0%, rgba(10, 61, 42, 0.65) 100%);
}

.page-about .archive-card__body {
  padding: 1.75rem 1.5rem 1.5rem;
  color: var(--clr-ink);
}

.page-about .archive-card__kicker {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--clr-gold);
  background: var(--clr-bg);
  padding: 0.3rem 0.8rem;
  margin-bottom: 0.9rem;
  text-transform: uppercase;
}

.page-about .archive-card__title {
  font-family: var(--font-display);
  font-size: 2.4rem;
  line-height: 1.1;
  margin-bottom: 0.6rem;
  color: var(--clr-ink);
}

.page-about .archive-card__desc {
  font-size: 0.92rem;
  line-height: 1.75;
  color: #3a3a3a;
  margin-bottom: 1.25rem;
}

.page-about .archive-card__meta {
  margin: 0 0 1.25rem;
  border-top: 1px solid var(--clr-line);
}

.page-about .archive-card__row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--clr-line);
}

.page-about .archive-card__row dt {
  font-size: 0.8rem;
  font-weight: 600;
  color: #555;
  flex-shrink: 0;
}

.page-about .archive-card__row dd {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--clr-ink);
  text-align: right;
  word-break: break-all;
}

.page-about .archive-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.page-about .archive-card__actions .btn {
  flex: 1;
  justify-content: center;
  min-width: 110px;
}

/* 右侧主内容 */
.page-about .page-about__main {
  display: flex;
  flex-direction: column;
  gap: 3.5rem;
}

/* 章节头 */
.page-about .section-head {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.page-about .section-head .chapter__index {
  font-family: var(--font-display);
  font-size: 2.8rem;
  line-height: 1;
  color: var(--clr-gold);
  flex-shrink: 0;
  border-right: 2px solid rgba(212, 175, 55, 0.35);
  padding-right: 1rem;
}

.page-about .section-head__text h2 {
  font-family: var(--font-display);
  font-size: 1.75rem;
  line-height: 1.2;
  color: var(--clr-paper);
  margin: 0 0 0.3rem;
}

.page-about .section-head__sub {
  font-size: 0.9rem;
  color: rgba(245, 240, 230, 0.65);
  margin: 0;
}

/* 时间线 */
.page-about .journey {
  padding-top: 0.5rem;
}

.page-about .timeline {
  position: relative;
  padding-left: 2.5rem;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 0.5rem;
  top: 0.25rem;
  bottom: 0.25rem;
  width: 2px;
  background: linear-gradient(180deg, var(--clr-gold) 0%, rgba(212, 175, 55, 0.6) 60%, rgba(212, 175, 55, 0.2) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 1.75rem;
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -2.1rem;
  top: 0.35rem;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background: var(--clr-bg);
  border: 3px solid var(--clr-gold);
  box-shadow: 0 0 0 2px var(--clr-gold);
}

.page-about .timeline__item--featured::before {
  background: var(--clr-gold);
  box-shadow: 0 0 0 2px var(--clr-gold), 0 0 16px rgba(212, 175, 55, 0.6);
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--clr-gold);
  letter-spacing: 0.1em;
  margin-bottom: 0.4rem;
  display: inline-block;
}

.page-about .timeline__card {
  background: var(--clr-paper);
  border-left: 4px solid var(--clr-gold);
  border-top: 1px solid var(--clr-line);
  border-right: 1px solid var(--clr-line);
  border-bottom: 1px solid var(--clr-line);
  padding: 1.25rem 1.25rem 1.1rem;
  color: var(--clr-ink);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.15);
}

.page-about .timeline__card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin: 0 0 0.45rem;
  color: var(--clr-ink);
}

.page-about .timeline__card p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: #3a3a3a;
  margin: 0;
}

.page-about .timeline__img {
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  margin-bottom: 0.9rem;
  border: 1px solid var(--clr-line);
}

/* 数据规模仪表盘 */
.page-about .metrics {
  padding-top: 0.5rem;
}

.page-about .metrics__panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
}

.page-about .metrics__media {
  position: relative;
  overflow: hidden;
  border: 2px solid var(--clr-gold);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.2);
  max-height: 280px;
}

.page-about .metrics__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  max-height: 280px;
}

.page-about .metrics__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10, 61, 42, 0.2) 0%, rgba(10, 61, 42, 0.55) 100%);
}

.page-about .metrics__content {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.page-about .metrics__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.page-about .metric-item {
  background: var(--clr-paper);
  border: 2px solid var(--clr-gold);
  padding: 1.1rem 0.9rem;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.12);
}

.page-about .metric-item__num {
  font-family: var(--font-mono);
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--clr-bg);
  line-height: 1.2;
  letter-spacing: -0.03em;
  white-space: nowrap;
}

.page-about .metric-item__num .metric-item__unit {
  font-size: 1rem;
  color: var(--clr-alert);
  margin-left: 0.15rem;
}

.page-about .metric-item__label {
  font-size: 0.78rem;
  color: #555;
}

.page-about .metrics__note {
  font-size: 0.85rem;
  line-height: 1.7;
  color: rgba(245, 240, 230, 0.75);
  background: rgba(10, 61, 42, 0.6);
  border-left: 3px solid var(--clr-gold);
  padding: 0.85rem 1rem;
  margin: 0;
}

/* 资质与合作 */
.page-about .trust__cert {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.1rem;
  align-items: start;
  background: var(--clr-paper);
  border: 2px solid var(--clr-gold);
  padding: 1.4rem;
  color: var(--clr-ink);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.15);
  margin-bottom: 1.5rem;
}

.page-about .trust__badge {
  color: var(--clr-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  background: rgba(212, 175, 55, 0.12);
  border-radius: 50%;
}

.page-about .trust__cert h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin: 0 0 0.35rem;
}

.page-about .trust__cert p,
.page-about .award-item p {
  font-size: 0.87rem;
  line-height: 1.65;
  color: #3a3a3a;
  margin: 0;
}

.page-about .trust__block-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--clr-gold);
  margin: 0 0 0.85rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(212, 175, 55, 0.35);
}

.page-about .partners__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.page-about .partner-card {
  background: rgba(10, 61, 42, 0.45);
  border: 1px solid rgba(212, 175, 55, 0.5);
  padding: 1rem 0.75rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  transition: border-color 0.25s ease;
}

.page-about .partner-card:hover {
  border-color: var(--clr-gold);
}

.page-about .partner-card__name {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--clr-paper);
}

.page-about .partner-card__field {
  font-size: 0.75rem;
  color: rgba(245, 240, 230, 0.6);
}

.page-about .award-item {
  background: var(--clr-paper);
  border-left: 4px solid var(--clr-gold);
  padding: 1.1rem 1.25rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  color: var(--clr-ink);
}

.page-about .award-item__icon {
  color: var(--clr-gold);
  flex-shrink: 0;
  display: flex;
}

.page-about .award-item h4 {
  font-size: 1rem;
  margin: 0 0 0.3rem;
  font-family: var(--font-display);
}

/* 版本演进 */
.page-about .versions__track {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  padding: 0.5rem 0.25rem 1rem;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .versions__track::-webkit-scrollbar {
  height: 5px;
}

.page-about .versions__track::-webkit-scrollbar-track {
  background: rgba(245, 240, 230, 0.1);
}

.page-about .versions__track::-webkit-scrollbar-thumb {
  background: var(--clr-gold);
  border-radius: 3px;
}

.page-about .version-card {
  flex: 0 0 248px;
  scroll-snap-align: start;
  border: 2px solid transparent;
  padding: 1.5rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  box-shadow: 5px 5px 0 rgba(0, 0, 0, 0.18);
}

.page-about .version-card__code {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1;
}

.page-about .version-card h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin: 0;
}

.page-about .version-card p {
  font-size: 0.85rem;
  line-height: 1.6;
  margin: 0;
  opacity: 0.85;
}

.page-about .version-card--v1 {
  background: var(--clr-bg);
  border-color: var(--clr-gold);
  color: var(--clr-paper);
}

.page-about .version-card--v2 {
  background: var(--clr-gray);
  border-color: #4a4a4a;
  color: var(--clr-paper);
}

.page-about .version-card--v3 {
  background: var(--clr-gold);
  border-color: #b8962e;
  color: var(--clr-ink);
}

.page-about .version-card--v4 {
  background: var(--clr-cyan);
  border-color: #00b3a0;
  color: var(--clr-ink);
}

.page-about .versions__hint {
  font-size: 0.8rem;
  color: rgba(245, 240, 230, 0.55);
  text-align: right;
  margin: 0.4rem 0 0;
}

/* 底部CTA */
.page-about .about-cta {
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.18) 0%, rgba(10, 61, 42, 0.4) 100%);
  border: 2px solid rgba(212, 175, 55, 0.5);
  padding: 1.75rem 1.5rem;
  text-align: center;
}

.page-about .about-cta__title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--clr-paper);
  margin: 0 0 0.5rem;
}

.page-about .about-cta__desc {
  font-size: 0.9rem;
  color: rgba(245, 240, 230, 0.75);
  margin: 0 0 1.1rem;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  justify-content: center;
}

.page-about .about-cta__actions .btn {
  min-width: 100px;
  justify-content: center;
}

/* 桌面端 */
@media (min-width: 1024px) {
  .page-about__layout {
    grid-template-columns: 340px minmax(0, 1fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about__side {
    position: sticky;
    top: 2rem;
  }

  .page-about .archive-card__media {
    height: 260px;
  }

  .page-about .archive-card__body {
    padding: 2rem 1.75rem;
  }

  .page-about .archive-card__title {
    font-size: 2.8rem;
  }

  .page-about .section-head .chapter__index {
    font-size: 3.5rem;
  }

  .page-about .section-head__text h2 {
    font-size: 2rem;
  }

  .page-about .timeline__card {
    padding: 1.4rem 1.6rem;
  }

  .page-about .timeline__img {
    max-height: 200px;
    width: 100%;
    object-fit: cover;
  }

  .page-about .metrics__panel {
    grid-template-columns: 320px minmax(0, 1fr);
    gap: 1.75rem;
    align-items: center;
  }

  .page-about .metrics__media,
  .page-about .metrics__media img {
    max-height: 360px;
  }

  .page-about .metrics__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.9rem;
  }

  .page-about .metric-item {
    padding: 1.4rem 1.1rem;
  }

  .page-about .metric-item__num {
    font-size: 1.9rem;
  }

  .page-about .trust__cert {
    padding: 1.6rem;
  }

  .page-about .partners__grid {
    gap: 1rem;
  }

  .page-about .version-card {
    flex-basis: 280px;
    padding: 1.75rem 1.5rem;
  }
}