.page-about {
  --about-line: rgba(26, 21, 18, .16);
  --about-line-soft: rgba(26, 21, 18, .09);
  --about-cool: #5F6E6A;
  --about-cool-soft: #8A9693;
  display: block;
  background: var(--c-night);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding-top: calc(var(--header-h) + 18px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  background: var(--c-night);
  border-bottom: 1px solid var(--c-grid);
  padding: 28px 0 60px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  align-items: end;
}

.page-about .about-hero__lead .label {
  color: var(--c-signal-soft);
  margin: 0;
}

.page-about .about-hero h1 {
  margin: 18px 0 0;
  color: var(--c-cream);
  max-width: 15em;
}

.page-about .about-hero__intro {
  max-width: 34em;
  margin: 22px 0 0;
  color: var(--c-silver);
  font-size: 16px;
  line-height: 1.75;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 0;
  border-top: 1px solid var(--c-grid);
}

.page-about .about-fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--c-grid);
}

.page-about .about-fact dt {
  margin: 0;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--c-silver);
}

.page-about .about-fact dd {
  margin: 0;
  font-family: var(--f-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: 24px;
  line-height: 1.1;
  color: var(--c-score);
  letter-spacing: -.01em;
}

.page-about .about-fact dd.about-fact__anchor {
  color: var(--c-signal);
  font-size: 22px;
}

/* ---------- 正文区 ---------- */
.page-about .about-body {
  background: var(--c-cream);
  color: var(--c-lead);
  padding-top: 48px;
  padding-bottom: 72px;
}

.page-about .about-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
}

/* 目录 */
.page-about .about-toc {
  align-self: start;
  border-top: 1px solid var(--about-line);
  padding-top: 14px;
}

.page-about .about-toc__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--about-cool);
}

.page-about .about-toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc__list a {
  display: inline-block;
  padding: 3px 0;
  font-size: 13px;
  color: var(--c-lead);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  border-bottom-color: var(--c-signal);
  outline: none;
}

/* 章节 */
.page-about .about-sec {
  padding-top: 32px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-sec + .about-sec {
  margin-top: 56px;
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 20px;
}

.page-about .about-sec__idx {
  flex: none;
  font-family: var(--f-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--about-cool-soft);
}

.page-about .about-sec__title {
  margin: 0;
  font-size: clamp(21px, 3vw, 30px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--c-lead);
}

.page-about .about-content p {
  max-width: 36em;
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-lead);
}

.page-about .about-sec__foot {
  margin-top: 22px !important;
  padding-top: 16px;
  border-top: 1px solid var(--about-line-soft);
  color: var(--about-cool) !important;
  font-size: 14px !important;
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-about .about-split__media,
.page-about .about-banner,
.page-about .about-team__media {
  margin: 0;
}

.page-about figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--about-cool);
  letter-spacing: .02em;
}

/* 媒体容器 */
.page-about .about-media {
  position: relative;
  overflow: hidden;
  background: var(--c-pitch);
  border: 1px solid var(--about-line);
}

.page-about .about-media--3x2 {
  aspect-ratio: 3 / 2;
}

.page-about .about-media--14x9 {
  aspect-ratio: 14 / 9;
}

.page-about .about-media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(.72) brightness(.9) contrast(1.02);
}

.page-about .about-media__tag {
  position: absolute;
  top: 12px;
  right: 12px;
  padding: 3px 7px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--c-cream);
  background: rgba(11, 31, 26, .58);
  border: 1px solid rgba(243, 235, 221, .22);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  margin: 30px 0 34px;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 0 0 26px 26px;
  border-left: 1px solid var(--about-line);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 9px;
  width: 7px;
  height: 7px;
  background: var(--about-cool-soft);
  transition: background var(--t-fast) var(--ease);
}

.page-about .about-timeline__item.is-current::before {
  left: -5px;
  width: 9px;
  height: 9px;
  background: var(--c-signal);
}

.page-about .about-timeline__item:hover::before {
  background: var(--c-line);
}

.page-about .about-timeline__item.is-current:hover::before {
  background: var(--c-signal);
}

.page-about .about-timeline__year {
  font-family: var(--f-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  line-height: 1.15;
  letter-spacing: -.01em;
  color: var(--about-cool);
  transition: color var(--t-fast) var(--ease);
}

.page-about .about-timeline__item.is-current .about-timeline__year {
  color: var(--c-signal);
}

.page-about .about-timeline__item:not(.is-current):hover .about-timeline__year {
  color: var(--c-lead);
}

.page-about .about-timeline__title {
  margin: 2px 0 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-lead);
}

.page-about .about-timeline__note {
  max-width: 34em;
  margin: 4px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-cool);
}

.page-about .about-banner {
  border-top: 1px solid var(--about-line-soft);
  padding-top: 22px;
}

/* ---------- 分工表 ---------- */
.page-about .about-team-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 8px;
}

.page-about .about-team {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .about-team caption {
  caption-side: top;
  text-align: left;
  padding-bottom: 10px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--about-cool);
}

.page-about .about-team th,
.page-about .about-team td {
  text-align: left;
  padding: 12px 14px 12px 0;
  border-bottom: 1px solid var(--about-line-soft);
  vertical-align: top;
  line-height: 1.6;
}

.page-about .about-team thead th {
  font-size: 11px;
  letter-spacing: .16em;
  font-weight: 400;
  color: var(--about-cool);
  border-bottom: 1px solid var(--about-line);
  padding-top: 0;
}

.page-about .about-team tbody th {
  font-weight: 700;
  color: var(--c-lead);
  white-space: nowrap;
}

.page-about .about-team tbody td {
  color: var(--c-lead);
}

.page-about .about-team .about-team__num {
  font-family: var(--f-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: 18px;
  color: var(--c-lead);
  white-space: nowrap;
}

.page-about .about-team tbody tr {
  transition: background var(--t-fast) var(--ease);
}

.page-about .about-team tbody tr:hover {
  background: rgba(31, 92, 66, .09);
}

.page-about .about-team tr.about-team__total th,
.page-about .about-team tr.about-team__total td {
  border-bottom: 0;
  border-top: 1px solid var(--about-line);
  padding-top: 14px;
}

/* ---------- 校对节奏 ---------- */
.page-about .about-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.page-about .about-step {
  padding: 20px 0 22px;
  border-bottom: 1px solid var(--about-line-soft);
}

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

.page-about .about-step__marker {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--c-signal);
}

.page-about .about-step__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--c-lead);
}

.page-about .about-step p {
  margin: 0;
  max-width: 32em;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-cool);
}

/* ---------- 备案与联系 ---------- */
.page-about .about-record {
  margin: 8px 0 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-record__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-record__row dt {
  margin: 0;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--about-cool);
}

.page-about .about-record__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-lead);
}

.page-about .about-record__row dd a {
  color: var(--c-lead);
  text-decoration: none;
  border-bottom: 1px solid var(--c-signal);
  transition: color var(--t-fast) var(--ease);
}

.page-about .about-record__row dd a:hover,
.page-about .about-record__row dd a:focus-visible {
  color: var(--c-signal);
  outline: none;
}

/* ---------- 相关页面 ---------- */
.page-about .about-next {
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-next__title {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--about-cool);
}

.page-about .about-next__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-next__link {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  padding: 14px 0 14px 0;
  border-bottom: 1px solid var(--about-line-soft);
  text-decoration: none;
  transition: padding-left var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.page-about .about-next__label {
  font-size: 15px;
  font-weight: 700;
  color: var(--c-lead);
}

.page-about .about-next__desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--about-cool);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  padding-left: 14px;
  background: rgba(31, 92, 66, .08);
  outline: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-fact {
    padding-right: 20px;
  }

  .page-about .about-record__row {
    grid-template-columns: 9em minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero {
    padding-bottom: 76px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 64px;
  }

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

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-team-wrap {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }

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

  .page-about .about-step {
    padding: 22px 24px 26px 0;
    border-bottom: 0;
    border-right: 1px solid var(--about-line-soft);
  }

  .page-about .about-step + .about-step {
    padding-left: 24px;
  }

  .page-about .about-step:last-child {
    padding-right: 0;
    border-right: 0;
  }

  .page-about .about-next__link {
    grid-template-columns: 13em minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    padding-top: 64px;
    padding-bottom: 92px;
  }

  .page-about .about-body__grid {
    grid-template-columns: minmax(170px, 3fr) minmax(0, 9fr);
    gap: 72px;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    border-top-color: var(--about-line);
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 0;
  }

  .page-about .about-toc__list li + li {
    border-top: 1px solid var(--about-line-soft);
  }

  .page-about .about-toc__list a {
    display: block;
    padding: 10px 0;
    font-size: 14px;
  }

  .page-about .about-sec + .about-sec {
    margin-top: 72px;
  }

  .page-about .about-timeline {
    margin: 36px 0 42px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__list a,
  .page-about .about-media img,
  .page-about .about-timeline__item::before,
  .page-about .about-timeline__year,
  .page-about .about-team tbody tr,
  .page-about .about-next__link,
  .page-about .about-record__row dd a {
    transition: none;
  }
}