.page-about {
  --about-gap: clamp(88px, 13vw, 160px);
  padding-block: 28px 96px;
}

.page-about .shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: 22px;
  box-sizing: border-box;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 32px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.page-about .breadcrumb a:hover {
  color: var(--gold);
}

.page-about .breadcrumb__sep {
  color: var(--line);
}

/* ---------- 档案封面 ---------- */
.page-about .dossier {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-radius: 40px 40px 40px 12px;
  border: 1px solid var(--line-soft);
  padding: 38px 22px 30px;
  background:
    radial-gradient(130% 110% at 2% 0%, rgba(142, 27, 46, .78), transparent 58%),
    radial-gradient(90% 120% at 100% 6%, rgba(107, 76, 230, .34), transparent 62%),
    linear-gradient(168deg, var(--ink-soft) 0%, var(--ink) 76%);
}

.page-about .dossier__texture {
  position: absolute;
  top: -16%;
  right: -24%;
  z-index: 0;
  width: 84%;
  max-width: none;
  height: auto;
  object-fit: cover;
  opacity: .26;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(closest-side at 55% 45%, #000 18%, transparent 78%);
  mask-image: radial-gradient(closest-side at 55% 45%, #000 18%, transparent 78%);
}

.page-about .dossier__inner {
  position: relative;
  z-index: 1;
}

.page-about .dossier__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin: 0;
  font-size: 12px;
  font-weight: 300;
  letter-spacing: .26em;
  color: var(--gold);
}

.page-about .dossier__eyebrow::before {
  content: "";
  width: 30px;
  height: 1px;
  background: var(--gold);
  opacity: .85;
}

.page-about .dossier h1 {
  margin: 20px 0 0;
  max-width: 17em;
  font-size: clamp(29px, 8vw, 52px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--text);
}

.page-about .dossier__lede {
  margin: 22px 0 0;
  max-width: var(--measure);
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .dossier__facts {
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid rgba(232, 180, 74, .28);
}

.page-about .dossier__facts li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 2px;
  border-bottom: 1px solid rgba(232, 180, 74, .14);
}

.page-about .fact__key {
  font-size: 13px;
  font-weight: 300;
  letter-spacing: .16em;
  color: var(--muted);
  white-space: nowrap;
}

.page-about .fact__val {
  font-family: var(--font-num);
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--gold-soft);
  white-space: nowrap;
}

.page-about .fact__val small {
  margin-left: 5px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  position: relative;
  margin-top: var(--about-gap);
}

.page-about .chapter__head {
  margin-bottom: 40px;
}

.page-about .chapter__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(40px, 11vw, 68px);
  font-weight: 700;
  line-height: .9;
  letter-spacing: -.03em;
  color: var(--gold);
  opacity: .92;
}

.page-about .chapter__title {
  margin: 14px 0 0;
  max-width: 20em;
  font-size: clamp(23px, 5.6vw, 34px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .chapter__title::after {
  content: "";
  display: block;
  width: 56px;
  height: 2px;
  margin-top: 18px;
  background: linear-gradient(90deg, var(--gold), rgba(232, 180, 74, 0));
}

.page-about .chapter__kicker {
  margin: 18px 0 0;
  max-width: var(--measure);
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .chapter__head--split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .track-figure {
  margin: 0;
  border-radius: 28px 28px 28px 8px;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--surface);
}

.page-about .track-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  opacity: .92;
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  column-gap: 14px;
  padding-bottom: 40px;
}

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

.page-about .timeline__axis {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding-top: 8px;
}

.page-about .timeline__axis::before {
  content: "";
  position: absolute;
  top: 22px;
  bottom: -40px;
  left: 50%;
  width: 1px;
  margin-left: -.5px;
  background: linear-gradient(180deg, rgba(232, 180, 74, .5), rgba(232, 180, 74, .06));
}

.page-about .timeline__item:last-child .timeline__axis::before {
  display: none;
}

.page-about .timeline__dot {
  position: relative;
  z-index: 1;
  flex: none;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 5px rgba(232, 180, 74, .12);
}

.page-about .timeline__no {
  position: relative;
  z-index: 1;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--muted);
}

.page-about .timeline__body {
  padding: 24px 20px;
  border-radius: var(--r-card);
  border: 1px solid var(--line-soft);
  background: var(--surface);
  transition: border-color .26s var(--ease), transform .26s var(--ease);
}

.page-about .timeline__body:hover {
  border-color: rgba(107, 76, 230, .6);
  transform: translateY(-3px);
}

.page-about .timeline__era {
  margin: 0;
  font-size: 12px;
  font-weight: 300;
  letter-spacing: .24em;
  color: var(--gold);
}

.page-about .timeline__body h3 {
  margin: 12px 0 12px;
  font-size: clamp(19px, 4.6vw, 24px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.page-about .timeline__body p {
  margin: 0;
  max-width: var(--measure);
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 折叠区 ---------- */
.page-about .fold {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
}

.page-about .fold > summary {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  cursor: pointer;
  list-style: none;
  font-size: 13px;
  font-weight: 300;
  letter-spacing: .16em;
  color: var(--gold-soft);
  transition: color .2s var(--ease);
}

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

.page-about .fold > summary::after {
  content: "";
  width: 7px;
  height: 7px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  transition: transform .24s var(--ease);
}

.page-about .fold[open] > summary::after {
  transform: rotate(-135deg) translateY(-1px);
}

.page-about .fold > summary:hover {
  color: var(--gold);
}

.page-about .fold ul {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .fold li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .fold li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .74em;
  width: 8px;
  height: 1px;
  background: var(--gold);
  opacity: .7;
}

/* ---------- 团队 ---------- */
.page-about .team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .team__list {
  display: grid;
  gap: 16px;
}

.page-about .team__card {
  padding: 24px 20px;
  border-radius: var(--r-card);
  border: 1px solid var(--line-soft);
  background: linear-gradient(150deg, rgba(35, 43, 84, .58), rgba(27, 24, 41, .92));
  transition: border-color .26s var(--ease), transform .26s var(--ease);
}

.page-about .team__card:hover {
  border-color: rgba(107, 76, 230, .62);
  transform: translateY(-3px);
}

.page-about .team__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
}

.page-about .team__role {
  font-size: 12px;
  font-weight: 300;
  letter-spacing: .24em;
  color: var(--gold);
}

.page-about .team__count {
  font-family: var(--font-num);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--gold-soft);
}

.page-about .team__count small {
  margin-left: 4px;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 400;
  color: var(--muted);
}

.page-about .team__desc {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .team__figure {
  margin: 0;
  border-radius: var(--r-card);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--ink-soft);
}

.page-about .team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .team__figure figcaption {
  padding: 14px 18px 16px;
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: .06em;
  color: var(--muted);
}

/* ---------- 更新节奏 ---------- */
.page-about .cadence {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  border-radius: 26px 26px 26px 8px;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--line-soft);
}

.page-about .cadence__item {
  padding: 24px 20px;
  background: var(--surface);
  transition: background .26s var(--ease);
}

.page-about .cadence__item:hover {
  background: #211D33;
}

.page-about .cadence__when {
  display: inline-block;
  padding: 5px 11px;
  border: 1px solid rgba(232, 180, 74, .35);
  border-radius: 10px 10px 10px 2px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .cadence__item h3 {
  margin: 14px 0 10px;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text);
}

.page-about .cadence__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.page-about .tag {
  display: inline-block;
  padding: 8px 16px 9px;
  border-radius: 14px 14px 14px 3px;
  border: 1px solid var(--line);
  background: rgba(35, 43, 84, .38);
  color: var(--text);
  font-size: 13px;
  font-weight: 300;
  letter-spacing: .14em;
  transition: transform .22s var(--ease), border-color .22s var(--ease), background .22s var(--ease);
}

.page-about .tag:hover {
  transform: translate(-3px, -2px);
  border-color: rgba(232, 180, 74, .6);
  background: rgba(142, 27, 46, .32);
}

/* ---------- 服务原则 ---------- */
.page-about .principles {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .principle {
  position: relative;
  padding-left: 26px;
}

.page-about .principle::before {
  content: "";
  position: absolute;
  left: 0;
  top: .64em;
  width: 14px;
  height: 1px;
  background: var(--gold);
  opacity: .85;
}

.page-about .principle h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text);
}

.page-about .principle p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 收束 ---------- */
.page-about .chapter--closing {
  position: relative;
  overflow: hidden;
  padding: 44px 22px 40px;
  border-radius: 36px 36px 36px 10px;
  border: 1px solid var(--line-soft);
  background:
    radial-gradient(120% 130% at 100% 0%, rgba(142, 27, 46, .5), transparent 58%),
    linear-gradient(160deg, var(--ink-soft), var(--ink));
}

.page-about .tally {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .tally__item {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .tally__num {
  font-family: var(--font-num);
  font-size: clamp(44px, 11vw, 72px);
  font-weight: 700;
  line-height: .95;
  letter-spacing: -.03em;
  color: var(--gold-soft);
}

.page-about .tally__num small {
  margin-left: 6px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 400;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .tally__cap {
  font-size: 14px;
  line-height: 1.7;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .closing__note {
  margin: 40px 0 0;
  padding-top: 28px;
  max-width: var(--measure);
  border-top: 1px solid rgba(232, 180, 74, .22);
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .shell {
    padding-inline: 32px;
  }

  .page-about .team__card,
  .page-about .timeline__body {
    padding: 28px 26px;
  }

  .page-about .dossier {
    padding: 46px 36px 38px;
  }
}

@media (min-width: 820px) {
  .page-about .chapter__head--split {
    grid-template-columns: minmax(0, 1fr) minmax(0, .82fr);
    align-items: end;
    gap: 48px;
  }

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

  .page-about .tally {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 36px;
  }

  .page-about .principles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 40px 48px;
  }
}

@media (min-width: 880px) {
  .page-about {
    padding-block: 44px 140px;
  }

  .page-about .dossier {
    padding: 56px 48px 46px;
  }

  .page-about .dossier__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: 44px;
    border-top: 0;
  }

  .page-about .dossier__facts li {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 22px 24px 20px 0;
    border-bottom: 0;
    border-top: 1px solid rgba(232, 180, 74, .28);
    border-right: 1px solid rgba(232, 180, 74, .14);
  }

  .page-about .dossier__facts li:last-child {
    border-right: 0;
  }

  .page-about .timeline__item {
    grid-template-columns: 64px minmax(0, 1fr);
    column-gap: 28px;
    padding-bottom: 56px;
  }

  .page-about .timeline__axis::before {
    bottom: -56px;
  }

  .page-about .team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .chapter--closing {
    padding: 60px 52px 56px;
  }
}

@media (min-width: 1080px) {
  .page-about .chapter__head--split {
    grid-template-columns: minmax(0, 1fr) minmax(0, .78fr);
  }

  .page-about .timeline__item {
    grid-template-columns: 76px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__body,
  .page-about .team__card,
  .page-about .tag,
  .page-about .cadence__item {
    transition: none;
  }

  .page-about .timeline__body:hover,
  .page-about .team__card:hover,
  .page-about .tag:hover {
    transform: none;
  }
}