.page-about {
  --about-axis: 196px;
  --about-dot: 9px;
  position: relative;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: clamp(18px, 4vw, 32px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -140px -12% auto -12%;
  height: 560px;
  background:
    radial-gradient(58% 100% at 26% 0%, rgba(255, 77, 46, .18), transparent 70%),
    radial-gradient(48% 100% at 88% 8%, rgba(45, 156, 255, .14), transparent 72%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(28px, 6vw, 56px);
  align-items: start;
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(34px, 7.2vw, 76px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 14px 0 18px;
}

.page-about .about-hero .lead {
  max-width: var(--measure);
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.8;
  color: var(--paper);
  opacity: .86;
}

.page-about .about-hero__marks {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  max-width: 520px;
}

.page-about .about-hero__marks li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 16px;
  border-radius: var(--r-md);
  background: var(--ink-2);
  border: 1px solid var(--line);
  font-size: 15px;
  color: var(--paper);
}

.page-about .about-hero__marks .mono {
  color: var(--flare);
  font-size: 13px;
  letter-spacing: .08em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  aspect-ratio: 5 / 4;
  overflow: hidden;
  border-radius: var(--r-xl);
  box-shadow: var(--shadow);
}

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

.page-about .about-hero__stamp {
  position: absolute;
  top: 18px;
  left: 18px;
  padding: 7px 14px;
  border-radius: var(--r-pill);
  background: rgba(11, 15, 14, .78);
  border: 1px solid var(--line-strong);
  color: var(--ice);
  font-size: 12px;
  letter-spacing: .18em;
}

.page-about .about-hero__figure .media-frame__cap {
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 16px;
  margin: 0;
  padding: 10px 16px;
  border-radius: var(--r-md);
  background: rgba(11, 15, 14, .82);
  border: 1px solid var(--line);
  color: var(--moss);
  font-size: 13px;
  line-height: 1.6;
}

/* ---------- 馆藏数字带 ---------- */
.page-about .about-stats__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 20px;
  background: var(--ink-2);
}

.page-about .about-stats__num {
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 800;
  line-height: 1;
  color: var(--flare);
}

.page-about .about-stats__item:nth-child(3) .about-stats__num,
.page-about .about-stats__item:nth-child(5) .about-stats__num {
  color: var(--ice);
}

.page-about .about-stats__label {
  font-size: 14px;
  line-height: 1.5;
  color: var(--moss);
}

/* ---------- 起源与定位 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: clamp(24px, 5vw, 44px);
}

.page-about .about-origin h2,
.page-about .about-team h2,
.page-about .about-partners h2,
.page-about .about-why h2,
.page-about .about-timeline h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(26px, 4.4vw, 46px);
  line-height: 1.14;
  color: var(--paper);
  margin: 12px 0 0;
}

.page-about .about-origin__body p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper);
  opacity: .88;
}

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

.page-about .about-origin__card {
  padding: 26px 24px;
  border-radius: var(--r-lg);
  border-left: 3px solid var(--flare);
  align-self: start;
}

.page-about .about-origin__card .exhibit__no {
  color: var(--amber);
  font-size: 12px;
  letter-spacing: .14em;
}

.page-about .about-origin__motto {
  margin: 14px 0 10px;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.6;
  color: var(--paper);
  font-weight: 700;
}

.page-about .about-origin__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--moss);
}

/* ---------- 编年时间线 ---------- */
.page-about .about-timeline__head {
  align-items: flex-end;
}

.page-about .about-timeline__hint {
  margin: 0;
  font-size: 14px;
  color: var(--moss);
}

.page-about .timeline {
  position: relative;
  margin-top: clamp(28px, 5vw, 48px);
}

.page-about .timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-bottom: 18px;
}

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

.page-about .timeline__year {
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--flare);
  text-transform: uppercase;
}

.page-about .timeline__card {
  padding: 20px 22px 22px;
  border-radius: var(--r-lg);
  background: var(--ink-2);
  border: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .timeline__card:hover {
  border-color: rgba(255, 77, 46, .55);
  transform: translateY(-2px);
}

.page-about .timeline__card .drawer__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.page-about .timeline__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-about .timeline__meta h3 {
  flex: 1 1 100%;
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(18px, 2.6vw, 24px);
  font-weight: 800;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .timeline__card .slant {
  font-size: 12px;
  letter-spacing: .06em;
}

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

.page-about .timeline__card .drawer__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper);
  opacity: .86;
}

.page-about .timeline__card .drawer__panel {
  border-top: 1px dashed var(--line-strong);
  margin-top: 14px;
  padding-top: 14px;
}

/* ---------- 编辑团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(26px, 5vw, 48px);
}

.page-about .about-team__figure {
  margin: 0;
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-team__body .prose {
  margin-top: 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper);
  opacity: .88;
}

.page-about .about-team__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-team__list .index-list__item {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  gap: 6px 14px;
  padding: 16px 18px;
  border-radius: var(--r-md);
  background: var(--ink-2);
  border: 1px solid var(--line);
}

.page-about .about-team__list .index-list__no {
  grid-row: span 2;
  align-self: center;
  font-size: 13px;
  color: var(--ice);
  letter-spacing: .08em;
}

.page-about .about-team__list .index-list__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-team__list .index-list__meta {
  font-size: 14px;
  line-height: 1.65;
  color: var(--moss);
}

/* ---------- 协作生态 ---------- */
.page-about .about-partners__grid {
  display: grid;
  gap: clamp(26px, 5vw, 48px);
  align-items: start;
}

.page-about .about-partners__head .prose {
  margin-top: 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper);
  opacity: .88;
}

.page-about .about-partners__tags,
.page-about .about-partners__certs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-partners__certs .slant {
  font-size: 12px;
}

.page-about .about-partners__cta {
  margin-top: 26px;
}

.page-about .about-partners__figure {
  margin: 0;
  border-radius: var(--r-xl);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .about-partners__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

/* ---------- 选择理由 ---------- */
.page-about .about-why__grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(26px, 5vw, 44px);
}

.page-about .about-why__card {
  padding: 26px 24px 28px;
  border-radius: var(--r-lg);
}

.page-about .about-why__card .exhibit__no {
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--amber);
}

.page-about .about-why__card h3 {
  margin: 14px 0 10px;
  font-family: var(--font-head);
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 800;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-why__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--moss);
}

.page-about .about-why__cta {
  margin-top: 22px;
  padding: clamp(24px, 4vw, 40px);
  border-radius: var(--r-xl);
  display: grid;
  gap: 22px;
  align-items: center;
}

.page-about .about-why__cta h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: clamp(20px, 3vw, 30px);
  font-weight: 800;
  line-height: 1.25;
  color: var(--paper);
}

.page-about .about-why__cta p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper);
  opacity: .85;
  max-width: 56ch;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-why__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .94fr);
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    align-items: start;
  }

  .page-about .about-origin__card {
    grid-column: 1 / 2;
    margin-top: 26px;
  }

  .page-about .about-origin__body {
    grid-column: 2 / 3;
    grid-row: 1 / 3;
  }

  .page-about .timeline::before {
    content: "";
    position: absolute;
    top: 10px;
    bottom: 10px;
    left: var(--about-axis);
    width: 1px;
    background: linear-gradient(to bottom, var(--flare), var(--line));
  }

  .page-about .timeline__item {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
    margin-bottom: 22px;
  }

  .page-about .timeline__item::before {
    content: "";
    position: absolute;
    top: 24px;
    left: calc(var(--about-axis) - 4px);
    width: var(--about-dot);
    height: var(--about-dot);
    border-radius: 50%;
    background: var(--flare);
    box-shadow: 0 0 0 4px rgba(255, 77, 46, .16);
  }

  .page-about .timeline__item:last-child::before {
    background: var(--ice);
    box-shadow: 0 0 0 4px rgba(45, 156, 255, .18);
  }

  .page-about .timeline__year {
    text-align: right;
    padding-top: 22px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
    align-items: center;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
    align-items: center;
  }

  .page-about .about-partners__figure {
    order: -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__card {
    transition: none;
  }

  .page-about .timeline__card:hover {
    transform: none;
  }
}