.page-about {
  background: var(--paper);
  color: var(--night);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 26px 20px 44px;
  background:
    repeating-linear-gradient(0deg, rgba(31, 95, 139, .07) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(90deg, rgba(31, 95, 139, .07) 0 1px, transparent 1px 64px),
    var(--sand);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -70px;
  right: -60px;
  width: 180px;
  height: 180px;
  background: var(--clay);
  opacity: .16;
  transform: rotate(12deg);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: 30px;
  max-width: 1180px;
  margin: 0 auto;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
}

.page-about .about-hero .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero .breadcrumbs li {
  color: rgba(14, 34, 51, .62);
}

.page-about .about-hero .breadcrumbs li + li::before {
  content: "／";
  margin-right: 8px;
  color: var(--line);
}

.page-about .about-hero .breadcrumbs a {
  color: var(--coordinate);
  text-decoration: none;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero .breadcrumbs a:hover {
  border-bottom-color: var(--coordinate);
}

.page-about .eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--clay);
}

.page-about h1 {
  margin: 0 0 18px;
  font-size: 34px;
  line-height: 1.18;
  letter-spacing: .01em;
  font-weight: 800;
  color: var(--night);
}

.page-about .about-hero__lead {
  margin: 0 0 24px;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(14, 34, 51, .82);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 20px;
  margin: 0 0 26px;
  padding: 16px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: 10px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-hero__fact-num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--coordinate);
}

.page-about .about-hero__fact-label {
  font-size: 12px;
  color: rgba(14, 34, 51, .66);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
}

/* ---------- 图版 ---------- */
.page-about .about-figure {
  margin: 0;
  padding: 10px;
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.page-about .about-figure__media {
  display: block;
  position: relative;
  overflow: hidden;
  background: var(--sand);
}

.page-about .about-figure__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(45deg, rgba(14, 34, 51, .05) 0 1px, transparent 1px 5px);
  pointer-events: none;
}

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

.page-about .about-figure__caption {
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px dashed var(--line-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.7;
  color: rgba(14, 34, 51, .6);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding: 48px 0;
}

.page-about .about-section--sand {
  background: var(--sand);
}

.page-about .about-section__inner {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 16px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 20px;
}

.page-about .about-rail {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 4px;
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--clay);
}

.page-about .about-rail__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--line);
  writing-mode: horizontal-tb;
}

.page-about .about-body__title {
  margin: 0 0 14px;
  font-size: 24px;
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--night);
}

.page-about .about-body__lead {
  margin: 0 0 28px;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(14, 34, 51, .8);
}

/* ---------- 定位三卡 ---------- */
.page-about .about-cards {
  display: grid;
  gap: 14px;
}

.page-about .about-card {
  position: relative;
  padding: 18px 18px 18px 20px;
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--coordinate);
  border-radius: var(--radius);
  transition: transform .22s var(--ease), border-color .22s var(--ease), box-shadow .22s var(--ease);
}

.page-about .about-card:hover {
  transform: translateY(-3px);
  border-left-color: var(--clay);
  box-shadow: var(--shadow-card);
}

.page-about .about-card__title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--night);
}

.page-about .about-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(14, 34, 51, .74);
}

/* ---------- 筛选 ---------- */
.page-about .about-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 26px;
}

.page-about .filter-chip {
  padding: 7px 13px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--night);
  background: transparent;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  cursor: pointer;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .filter-chip:hover {
  color: var(--coordinate);
  border-color: var(--coordinate);
}

.page-about .filter-chip[aria-pressed="true"] {
  color: var(--paper);
  background: var(--clay);
  border-color: var(--clay);
}

.page-about .filter-item.is-hidden {
  display: none;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0 0 32px;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 9px;
  width: 2px;
  background: linear-gradient(180deg, var(--coordinate), rgba(31, 95, 139, .12));
}

.page-about .about-milestone {
  position: relative;
  padding: 0 0 26px 34px;
}

.page-about .about-milestone__marker {
  position: absolute;
  left: 3px;
  top: 5px;
  width: 14px;
  height: 14px;
  background: var(--paper);
  border: 2px solid var(--coordinate);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(47, 212, 196, .18);
}

.page-about .about-milestone__meta {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
}

.page-about .about-milestone__index {
  color: var(--clay);
  font-weight: 700;
}

.page-about .about-milestone__year {
  color: var(--coordinate);
}

.page-about .about-milestone__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--night);
}

.page-about .about-milestone__text {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(14, 34, 51, .76);
}

.page-about .tag {
  display: inline-block;
  padding: 2px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  border-radius: 999px;
}

.page-about .tag--clay {
  color: var(--clay);
  background: rgba(180, 74, 50, .1);
  border: 1px solid rgba(180, 74, 50, .3);
}

/* ---------- 档案图 ---------- */
.page-about .about-archive {
  margin-top: 8px;
}

/* ---------- 团队 ---------- */
.page-about .about-team-wrap {
  display: grid;
  gap: 24px;
}

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

.page-about .about-team__row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 12px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-team__row:first-child {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-team__role {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--night);
}

.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--clay);
}

.page-about .about-team__unit {
  margin-left: 2px;
  font-size: 11px;
  font-weight: 400;
  color: var(--line);
}

.page-about .about-team__desc {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(14, 34, 51, .74);
}

.page-about .about-team__rhythm {
  margin: 24px 0 0;
  padding: 14px 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--night);
  background: var(--paper);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius);
}

/* ---------- 协作 ---------- */
.page-about .about-collab {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-collab__item {
  padding: 16px 18px;
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-collab__item:hover {
  transform: translateY(-2px);
  border-color: var(--coordinate);
}

.page-about .about-collab__name {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--coordinate);
}

.page-about .about-collab__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(14, 34, 51, .74);
}

/* ---------- 数据 ---------- */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
}

.page-about .about-metric {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 14px;
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  transition: transform .22s var(--ease), border-color .22s var(--ease), box-shadow .22s var(--ease);
}

.page-about .about-metric::before {
  content: "";
  position: absolute;
  top: 12px;
  right: 12px;
  width: 6px;
  height: 6px;
  background: var(--cyan);
  border-radius: 50%;
  opacity: .5;
  transition: opacity .22s var(--ease), transform .22s var(--ease);
}

.page-about .about-metric:hover,
.page-about .about-metric:focus-within {
  transform: translateY(-3px);
  border-color: var(--coordinate);
  box-shadow: var(--shadow-card);
}

.page-about .about-metric:hover::before {
  opacity: 1;
  transform: scale(1.4);
}

.page-about .about-metric__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--clay);
}

.page-about .about-metric__label {
  font-size: 13px;
  color: var(--night);
}

.page-about .about-metric__note {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed var(--line-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.7;
  color: rgba(14, 34, 51, .58);
  transition: color .22s var(--ease);
}

.page-about .about-metric:hover .about-metric__note {
  color: rgba(14, 34, 51, .82);
}

/* ---------- 荣誉 ---------- */
.page-about .about-honor {
  position: relative;
  overflow: hidden;
  padding: 24px 22px;
  color: var(--paper);
  background: var(--night);
  border-radius: var(--radius);
  border-top: 4px solid var(--clay);
}

.page-about .about-honor::after {
  content: "";
  position: absolute;
  right: -50px;
  bottom: -50px;
  width: 160px;
  height: 160px;
  border: 1px solid rgba(47, 212, 196, .45);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-honor__label {
  position: relative;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .about-honor__title {
  position: relative;
  margin: 0 0 10px;
  font-size: 19px;
  line-height: 1.45;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-honor__text {
  position: relative;
  margin: 0;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(247, 242, 232, .78);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: 44px 20px 56px;
  color: var(--paper);
  background: var(--clay);
}

.page-about .about-cta__inner {
  max-width: 1180px;
  margin: 0 auto;
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-size: 24px;
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 0 0 22px;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(247, 242, 232, .88);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
}

.page-about .about-cta .btn {
  display: inline-block;
  padding: 11px 20px;
  font-size: 14px;
  letter-spacing: .04em;
  text-decoration: none;
  border-radius: var(--radius);
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-cta .btn--solid {
  color: var(--clay-deep);
  background: var(--paper);
  border: 1px solid var(--paper);
}

.page-about .about-cta .btn--solid:hover {
  background: var(--sand);
}

.page-about .about-cta .btn--ghost {
  color: var(--paper);
  background: transparent;
  border: 1px solid rgba(247, 242, 232, .55);
}

.page-about .about-cta .btn--ghost:hover {
  background: rgba(14, 34, 51, .18);
  border-color: var(--paper);
}

/* 首屏按钮 */
.page-about .about-hero__actions .btn {
  display: inline-block;
  padding: 10px 18px;
  font-size: 14px;
  letter-spacing: .04em;
  text-decoration: none;
  border-radius: var(--radius);
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-hero__actions .btn--solid {
  color: var(--paper);
  background: var(--clay);
  border: 1px solid var(--clay);
}

.page-about .about-hero__actions .btn--solid:hover {
  background: var(--clay-deep);
  border-color: var(--clay-deep);
}

.page-about .about-hero__actions .btn--ghost {
  color: var(--coordinate);
  background: transparent;
  border: 1px solid var(--coordinate);
}

.page-about .about-hero__actions .btn--ghost:hover {
  color: var(--paper);
  background: var(--coordinate);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 36px 32px 60px;
  }

  .page-about h1 {
    font-size: 46px;
  }

  .page-about .about-hero__lead {
    font-size: 16px;
  }

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

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

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

  .page-about .about-team__row {
    grid-template-columns: 150px 90px minmax(0, 1fr);
    align-items: baseline;
    gap: 4px 18px;
  }

  .page-about .about-team__desc {
    grid-column: auto;
  }

  .page-about .about-section {
    padding: 62px 0;
  }

  .page-about .about-body__title {
    font-size: 30px;
  }

  .page-about .about-cta__title {
    font-size: 30px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-hero__aside {
    margin-top: 54px;
  }

  .page-about h1 {
    font-size: 56px;
    line-height: 1.1;
  }

  .page-about .about-section__inner {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 36px;
    padding: 0 32px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
    flex-direction: row;
    align-items: baseline;
    gap: 10px;
    padding-top: 8px;
    border-top: 2px solid var(--clay);
  }

  .page-about .about-rail__num {
    font-size: 20px;
  }

  .page-about .about-team-wrap {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .7fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-timeline {
    padding-left: 6px;
  }

  .page-about .about-milestone {
    padding-left: 46px;
    padding-bottom: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .about-metric,
  .page-about .about-collab__item,
  .page-about .btn,
  .page-about .filter-chip {
    transition: none;
  }

  .page-about .about-card:hover,
  .page-about .about-metric:hover,
  .page-about .about-collab__item:hover {
    transform: none;
  }
}