.page-about {
  --tl-line: rgba(216, 164, 69, .42);
  --tl-node: 8px;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(22px, 4.5vw, 46px);
}

.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  list-style: none;
  margin: 0 0 clamp(20px, 3.5vw, 34px);
  padding: 0;
  font-size: 13.5px;
  color: var(--dark-muted);
}

.page-about .breadcrumbs__list a {
  color: var(--dark-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-collapse) var(--ease-out), border-color var(--dur-collapse) var(--ease-out);
}

.page-about .breadcrumbs__list a:hover,
.page-about .breadcrumbs__list a:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4.5vw, 48px);
  align-items: end;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(30px, 6.4vw, 58px);
  line-height: 1.12;
  color: var(--dark-text);
  max-width: 22ch;
}

.page-about .about-hero__intro {
  margin: 20px 0 0;
  max-width: 62ch;
  color: var(--dark-muted);
  font-size: 16.5px;
  line-height: 1.82;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--glass-line);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--ink-800);
}

.page-about .about-stat .stat__value {
  color: var(--amber);
  font-size: clamp(20px, 3.4vw, 24px);
  letter-spacing: -.01em;
  line-height: 1.1;
}

.page-about .about-stat .stat__label {
  color: var(--dark-muted);
  font-size: 13px;
  line-height: 1.5;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__cover {
  margin: 0 0 clamp(30px, 5vw, 58px);
  border-radius: var(--radius-panel);
  overflow: hidden;
}

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 7px;
  width: 1px;
  background: linear-gradient(180deg, rgba(216, 164, 69, 0) 0%, var(--tl-line) 7%, var(--tl-line) 93%, rgba(216, 164, 69, 0) 100%);
}

.page-about .tl__stage {
  position: relative;
  padding: 0 0 0 34px;
  margin: 0 0 clamp(34px, 6vw, 66px);
}

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

.page-about .tl__stage::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 9px;
  width: 11px;
  height: 11px;
  margin-left: -5px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--gold);
  box-shadow: 0 0 0 5px rgba(216, 164, 69, .12);
}

.page-about .tl__year {
  display: block;
  margin: 0 0 9px;
  color: var(--amber);
  font-size: 15px;
  letter-spacing: .1em;
}

.page-about .tl__body {
  background: var(--paper);
  color: var(--ink-text);
  border: 1px solid rgba(27, 20, 16, .1);
  border-radius: var(--radius-card);
  padding: clamp(20px, 3.2vw, 32px);
}

.page-about .tl__title {
  margin: 0 0 12px;
  font-size: clamp(18px, 2.3vw, 22px);
  line-height: 1.4;
  color: var(--ink-text);
  letter-spacing: -.01em;
}

.page-about .tl__text {
  margin: 0 0 16px;
  color: var(--ink-muted);
  font-size: 15.5px;
  line-height: 1.82;
}

/* ---------- 可展开内容组 ---------- */
.page-about .fold__sign {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  color: var(--gold);
}

.page-about .fold__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  text-align: left;
}

/* 纸层内的折叠组 */
.page-about .tl__body .fold {
  margin-top: 4px;
  border: 1px solid var(--paper-line);
  border-radius: var(--radius-sm);
  background: rgba(220, 207, 184, .34);
}

.page-about .tl__body .fold__trigger {
  padding: 14px 16px;
  background: transparent;
  border: 0;
  cursor: pointer;
  font: inherit;
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink-text);
  transition: color var(--dur-collapse) var(--ease-out);
}

.page-about .tl__body .fold__trigger:hover,
.page-about .tl__body .fold__trigger:focus-visible {
  color: #8a6420;
}

.page-about .tl__body .fold__inner {
  padding: 0 16px 16px;
  color: var(--ink-muted);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .tl__body .fold__inner p {
  margin: 0;
}

/* ---------- 资料库 ---------- */
.page-about .about-archive .rail {
  display: grid;
  gap: clamp(26px, 4vw, 42px);
  align-items: start;
}

.page-about .about-archive__cover {
  margin: 0 0 clamp(20px, 3vw, 28px);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .about-archive__prose p {
  margin: 0 0 1.15em;
  color: var(--dark-muted);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-archive__prose a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 201, 107, .5);
  transition: border-color var(--dur-collapse) var(--ease-out);
}

.page-about .about-archive__prose a:hover,
.page-about .about-archive__prose a:focus-visible {
  border-bottom-color: var(--amber);
}

.page-about .about-archive__card {
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius-card);
}

.page-about .about-archive__card .index-label {
  display: block;
  margin: 0 0 16px;
}

.page-about .about-archive__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 13px;
}

.page-about .about-archive__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--paper-line);
}

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

.page-about .about-archive__key {
  color: var(--ink-muted);
  font-size: 13.5px;
  line-height: 1.5;
}

.page-about .about-archive__val {
  color: var(--ink-text);
  font-size: 15px;
  white-space: nowrap;
}

.page-about .about-archive__note {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--paper-line);
  color: var(--ink-muted);
  font-size: 13.5px;
  line-height: 1.72;
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 18px;
}

.page-about .about-team__card {
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--radius-card);
  display: flex;
  flex-direction: column;
}

.page-about .about-team__card .index-label {
  display: block;
  margin: 0 0 10px;
}

.page-about .about-team__figure {
  margin: 0 0 10px;
  font-size: clamp(30px, 5vw, 42px);
  line-height: 1;
  color: #a9752a;
  letter-spacing: -.02em;
}

.page-about .about-team__title {
  margin: 0 0 10px;
  font-size: 17.5px;
  line-height: 1.45;
  color: var(--ink-text);
}

.page-about .about-team__text {
  margin: 0;
  color: var(--ink-muted);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-team__media {
  margin: 0;
  border-radius: var(--radius-card);
  overflow: hidden;
}

/* ---------- 规模 ---------- */
.page-about .about-scale__board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--glass-line);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-card);
  overflow: hidden;
  margin-bottom: clamp(28px, 5vw, 48px);
}

.page-about .about-scale__cell {
  padding: clamp(20px, 3.2vw, 30px) clamp(16px, 2.4vw, 22px);
  background: linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 100%);
}

.page-about .about-scale__num {
  margin: 0 0 8px;
  color: var(--amber);
  font-size: clamp(22px, 4vw, 32px);
  line-height: 1.1;
  letter-spacing: -.02em;
}

.page-about .about-scale__cap {
  margin: 0;
  color: var(--dark-muted);
  font-size: 13px;
  line-height: 1.55;
}

.page-about .about-scale__title {
  margin: 0 0 12px;
  font-size: clamp(19px, 2.6vw, 26px);
  line-height: 1.4;
  color: var(--dark-text);
  letter-spacing: -.01em;
}

.page-about .about-scale__text {
  margin: 0;
  max-width: 68ch;
  color: var(--dark-muted);
  font-size: 16px;
  line-height: 1.82;
}

.page-about .about-scale__bar {
  display: flex;
  height: 10px;
  margin: 22px 0 14px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(122, 138, 160, .16);
  border: 1px solid var(--glass-line);
}

.page-about .about-scale__seg--main {
  flex: 46;
  background: linear-gradient(90deg, var(--gold), var(--amber));
}

.page-about .about-scale__seg--rest {
  flex: 54;
  background: rgba(122, 138, 160, .34);
}

.page-about .about-scale__legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  color: var(--dark-muted);
  font-size: 13.5px;
}

.page-about .about-scale__legend li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-scale__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex: 0 0 auto;
}

.page-about .about-scale__dot--main {
  background: var(--amber);
}

.page-about .about-scale__dot--rest {
  background: rgba(122, 138, 160, .6);
}

/* ---------- 坚持的做法 ---------- */
.page-about .about-principles__list {
  display: grid;
  gap: 12px;
}

.page-about .about-principles .fold {
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-card);
  background: var(--glass-fill);
  transition: border-color var(--dur-expand) var(--ease-out), background-color var(--dur-expand) var(--ease-out);
}

.page-about .about-principles .fold:hover {
  border-color: var(--glass-line-strong);
}

.page-about .about-principles .fold.is-open {
  border-color: rgba(216, 164, 69, .5);
  background: rgba(216, 164, 69, .06);
}

.page-about .about-principles .fold__trigger {
  padding: clamp(16px, 2.4vw, 22px) clamp(18px, 2.6vw, 26px);
  background: transparent;
  border: 0;
  cursor: pointer;
  font: inherit;
  font-size: clamp(16px, 1.4vw, 17.5px);
  line-height: 1.5;
  color: var(--dark-text);
  letter-spacing: -.01em;
  transition: color var(--dur-collapse) var(--ease-out);
}

.page-about .about-principles .fold__trigger:hover,
.page-about .about-principles .fold__trigger:focus-visible {
  color: var(--amber);
}

.page-about .about-principles .fold__inner {
  padding: 0 clamp(18px, 2.6vw, 26px) clamp(18px, 2.4vw, 22px);
  color: var(--dark-muted);
  font-size: 15.5px;
  line-height: 1.82;
}

.page-about .about-principles .fold__inner p {
  margin: 0;
  max-width: 72ch;
}

/* ---------- 下一步 ---------- */
.page-about .about-next__panel {
  border-radius: var(--radius-panel);
  padding: clamp(24px, 4vw, 46px);
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  align-items: center;
}

.page-about .about-next__title {
  margin: 0 0 12px;
  font-size: clamp(21px, 3vw, 30px);
  line-height: 1.3;
  color: var(--dark-text);
  letter-spacing: -.01em;
}

.page-about .about-next__text {
  margin: 0;
  max-width: 62ch;
  color: var(--dark-muted);
  font-size: 15.5px;
  line-height: 1.8;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-scale__board {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-team__media {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .95fr);
  }

  .page-about .about-timeline__cover {
    margin-bottom: 70px;
  }

  .page-about .tl::before {
    left: 138px;
  }

  .page-about .tl__stage {
    display: grid;
    grid-template-columns: 138px minmax(0, 1fr);
    column-gap: 44px;
    padding-left: 0;
    margin-bottom: 82px;
  }

  .page-about .tl__stage::before {
    left: 138px;
    top: 12px;
  }

  .page-about .tl__year {
    text-align: right;
    font-size: 17px;
    margin: 0;
    padding-top: 6px;
    letter-spacing: .06em;
  }

  .page-about .about-archive .rail {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }

  .page-about .about-next__panel {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }

  .page-about .about-next__actions {
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .fold,
  .page-about .tl__body .fold__trigger,
  .page-about .about-principles .fold__trigger,
  .page-about .breadcrumbs__list a,
  .page-about .about-archive__prose a {
    transition: none;
  }
}
<<<END>>>