.page-about {
  background-color: var(--night);
  color: var(--white);
}

/* 面包屑 */
.page-about .about-crumb {
  padding-block: clamp(16px, 3vw, 30px) 0;
}

/* 首屏 */
.page-about .about-hero__grid {
  display: grid;
  gap: clamp(32px, 6vw, 56px);
  padding-block: clamp(28px, 6vw, 72px) clamp(36px, 7vw, 88px);
}

.page-about .about-hero__title {
  margin: 18px 0 0;
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin-top: 24px;
  max-width: 48ch;
  color: var(--cold);
}

.page-about .about-hero__figures {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: var(--hairline);
}

.page-about .about-figure {
  padding: 20px 14px 18px 0;
  border-bottom: var(--hairline);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-figure:nth-child(odd) {
  border-right: var(--hairline);
}

.page-about .about-figure:nth-child(even) {
  padding-left: 18px;
}

.page-about .about-figure__num {
  font-family: var(--font-num);
  font-size: clamp(30px, 7vw, 46px);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--white);
}

.page-about .about-figure__unit {
  font-size: 0.42em;
  font-weight: 500;
  letter-spacing: 0.02em;
  margin-left: 3px;
  color: var(--accent);
}

.page-about .about-figure__label {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

/* 通栏示意 */
.page-about .about-banner__media {
  aspect-ratio: 16 / 9;
  margin: 0;
}

.page-about .about-banner__media .media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@media (min-width: 760px) {
  .page-about .about-banner__media {
    aspect-ratio: 16 / 7;
  }
}

/* 演进长卷 */
.page-about .about-chronicle__head {
  max-width: 62ch;
}

.page-about .about-chronicle__body {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  margin-top: clamp(28px, 5vw, 56px);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: block;
  padding: 10px 16px;
  border: var(--hairline);
  text-decoration: none;
  color: var(--muted);
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--white);
  border-color: var(--accent);
  background-color: rgba(255, 90, 31, 0.08);
}

.page-about .about-rail__year {
  display: block;
  font-family: var(--font-num);
  font-size: 17px;
  font-weight: 900;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.page-about .about-rail__stage {
  display: block;
  margin-top: 3px;
  font-size: 12px;
  letter-spacing: 0.12em;
}

.page-about .about-stages {
  display: grid;
}

.page-about .about-stage {
  padding-block: clamp(28px, 5vw, 52px);
  border-top: var(--hairline);
  scroll-margin-top: 96px;
}

.page-about .about-stage:last-child {
  border-bottom: var(--hairline);
}

.page-about .about-stage__year {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(38px, 10vw, 78px);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--white);
  opacity: 0.92;
}

.page-about .about-stage__title {
  margin: 14px 0 12px;
  font-size: clamp(19px, 3.4vw, 24px);
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-stage p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--cold);
}

.page-about .about-stage__gain {
  padding-left: 14px;
  border-left: 2px solid var(--accent);
  color: var(--white) !important;
}

@media (min-width: 900px) {
  .page-about .about-chronicle__body {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 84px);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-top: var(--hairline);
  }

  .page-about .about-rail__link {
    border: 0;
    border-bottom: var(--hairline);
    border-left: 2px solid transparent;
    padding: 16px 12px;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--accent);
    background-color: rgba(255, 90, 31, 0.06);
  }
}

/* 数据来源 */
.page-about .about-data__grid {
  display: grid;
  gap: clamp(30px, 5vw, 60px);
}

.page-about .about-data__text .lede {
  margin-top: 20px;
  max-width: 58ch;
  color: var(--cold);
}

.page-about .about-steps {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  border-top: var(--hairline);
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 8px;
  padding-block: 22px;
  border-bottom: var(--hairline);
}

.page-about .about-step__num {
  font-family: var(--font-num);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.06em;
  color: var(--accent);
  padding-top: 4px;
}

.page-about .about-step__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.page-about .about-step__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--cold);
  max-width: 56ch;
}

.page-about .about-data__figure {
  aspect-ratio: 3 / 2;
  margin: 0;
}

.page-about .about-data__figure .media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-tempo {
  list-style: none;
  margin: clamp(34px, 5vw, 60px) 0 0;
  padding: 0;
  display: grid;
  border-top: var(--hairline);
}

.page-about .about-tempo__item {
  padding: 22px 0;
  border-bottom: var(--hairline);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-tempo__num {
  font-family: var(--font-num);
  font-size: clamp(26px, 5vw, 36px);
  font-weight: 900;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  color: var(--white);
}

.page-about .about-tempo__label {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

@media (min-width: 780px) {
  .page-about .about-data__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

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

  .page-about .about-tempo__item {
    border-bottom: 0;
    padding: 26px 24px;
    border-left: var(--hairline);
  }

  .page-about .about-tempo__item:first-child {
    border-left: 0;
    padding-left: 0;
  }
}

/* 值守团队 */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-team__figure {
  padding: clamp(24px, 4vw, 38px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 10px;
}

.page-about .about-team__num {
  font-family: var(--font-num);
  font-size: clamp(72px, 18vw, 128px);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 0.9;
  font-variant-numeric: tabular-nums;
  color: var(--white);
}

.page-about .about-team__unit {
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--accent);
}

.page-about .about-team__copy p {
  margin: 0 0 18px;
  color: var(--cold);
}

.page-about .about-team__copy p:last-child {
  margin-bottom: 0;
}

.page-about .about-sites {
  list-style: none;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: var(--hairline);
}

.page-about .about-sites__item {
  padding: 18px 0;
  border-bottom: var(--hairline);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}

.page-about .about-sites__name {
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .about-sites__role {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-align: right;
}

@media (min-width: 860px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: stretch;
  }

  .page-about .about-sites {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-sites__item {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 22px 22px;
    border-bottom: 0;
    border-left: var(--hairline);
  }

  .page-about .about-sites__item:first-child {
    border-left: 0;
    padding-left: 0;
  }

  .page-about .about-sites__role {
    text-align: left;
  }
}

/* 覆盖范围 */
.page-about .about-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 18px;
  border-bottom: var(--hairline);
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-tabs__tab {
  appearance: none;
  -webkit-appearance: none;
  font-family: inherit;
  font-size: 14px;
  letter-spacing: 0.08em;
  padding: 9px 18px;
  background-color: transparent;
  color: var(--muted);
  border: var(--hairline);
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-tabs__tab:hover {
  color: var(--white);
  border-color: var(--accent-soft);
}

.page-about .about-tabs__tab[aria-selected="true"] {
  color: var(--white);
  border-color: var(--accent);
  background-color: rgba(255, 90, 31, 0.1);
}

.page-about .about-tabs__panels {
  display: grid;
  gap: 0;
}

.page-about .about-tabs__panel {
  padding: 24px 0;
  border-bottom: var(--hairline);
}

.page-about .about-tabs__panel:first-child {
  padding-top: 0;
}

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

.page-about .about-cov__name {
  margin: 0 0 6px;
  font-size: 20px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-cov__meta {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--jade);
}

.page-about .about-tabs__panel p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--cold);
  max-width: 58ch;
}

@media (min-width: 820px) {
  .page-about .about-tabs__panels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(28px, 4vw, 64px);
  }

  .page-about .about-tabs__panel {
    border-bottom: var(--hairline);
  }

  .page-about .about-tabs__panel:first-child {
    padding-top: 24px;
  }
}

/* 使用场景 */
.page-about .about-scenes__list {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  counter-reset: none;
}

.page-about .about-scene {
  padding-left: 18px;
  border-left: 2px solid var(--slate);
  transition: border-color 0.25s var(--ease);
}

.page-about .about-scene:hover {
  border-left-color: var(--accent);
}

.page-about .about-scene__index {
  display: block;
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.14em;
  color: var(--accent);
}

.page-about .about-scene__title {
  margin: 10px 0 12px;
  font-size: 20px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-scene p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--cold);
}

.page-about .about-scene p a {
  color: var(--accent-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-scene__note {
  font-size: 13px !important;
  letter-spacing: 0.02em;
  color: var(--muted) !important;
  padding-top: 10px;
  border-top: var(--hairline);
}

@media (min-width: 900px) {
  .page-about .about-scenes__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(28px, 4vw, 56px);
  }
}

/* 内容协作 */
.page-about .about-eco__grid {
  display: grid;
  gap: clamp(28px, 5vw, 60px);
}

.page-about .about-eco__text p {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--cold);
}

.page-about .about-eco__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: var(--hairline);
}

.page-about .about-eco__stat {
  padding: 22px 0;
  border-bottom: var(--hairline);
  display: flex;
  align-items: baseline;
  gap: 18px;
}

.page-about .about-eco__num {
  font-family: var(--font-num);
  font-size: clamp(38px, 8vw, 56px);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--white);
  min-width: 2ch;
}

.page-about .about-eco__label {
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

@media (min-width: 860px) {
  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    align-items: start;
  }
}

/* 接下来 */
.page-about .about-next__list {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: var(--hairline);
}

.page-about .about-next__item {
  padding-block: clamp(24px, 4vw, 40px);
  border-bottom: var(--hairline);
  display: grid;
  gap: 10px;
}

.page-about .about-next__num {
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.16em;
  color: var(--accent);
}

.page-about .about-next__title {
  margin: 0;
  font-size: 20px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-next__item p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--cold);
}

@media (min-width: 900px) {
  .page-about .about-next__item {
    grid-template-columns: 64px minmax(0, 320px) minmax(0, 1fr);
    align-items: baseline;
    gap: clamp(16px, 3vw, 40px);
  }
}

/* 收尾引导 */
.page-about .about-cta__inner {
  padding-block: clamp(38px, 6vw, 72px);
  border-top: var(--hairline);
}

.page-about .about-cta__title {
  margin: 0 0 16px;
  font-size: clamp(26px, 5vw, 40px);
  font-weight: 200;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-cta__text {
  margin: 0 0 26px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--cold);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta__actions .btn {
  text-decoration: none;
}

/* 页尾氛围图 */
.page-about .about-closing .container {
  padding-bottom: clamp(40px, 7vw, 88px);
}

.page-about .about-closing__media {
  margin: 0;
}

.page-about .about-closing__media .media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 键盘焦点统一 */
.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* 动效降噪 */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-tabs__tab,
  .page-about .about-scene {
    transition: none;
  }
}