.page-about {
  --about-line: rgba(184, 137, 47, 0.34);
  --about-gap: clamp(38px, 6vw, 78px);
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

.page-about .about-crumbs {
  padding-top: clamp(14px, 2vw, 22px);
  padding-bottom: clamp(6px, 1.5vw, 14px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(10px, 2vw, 24px) 0 clamp(34px, 6vw, 72px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(52vw, 560px);
  height: clamp(150px, 26vw, 290px);
  background: var(--cinnabar);
  border-radius: 0 0 0 190px;
  opacity: 0.94;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .about-hero__stamp {
  display: inline-block;
  margin: 0 0 clamp(14px, 2vw, 22px);
  padding: 5px 13px;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--cinnabar);
  border: 1px solid var(--cinnabar);
  border-radius: 2px;
  background: var(--paper-lit);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(31px, 6.6vw, 66px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.6vw, 26px) 0 0;
  max-width: 52ch;
  font-size: clamp(15.5px, 1.9vw, 18px);
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: clamp(16px, 2.4vw, 22px) 0 0;
  border-top: 1px solid var(--about-line);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(12px, 2vw, 22px);
}

.page-about .about-hero__stat-num {
  display: block;
  font-size: clamp(21px, 3.2vw, 32px);
  line-height: 1;
  color: var(--cinnabar);
  letter-spacing: -0.03em;
}

.page-about .about-hero__stat-key {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--warm);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-hero__figure {
  margin: 0;
  border-radius: 4px 22px 4px 22px;
}

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

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: clamp(34px, 5.6vw, 70px) 0;
}

.page-about .about-section__grid {
  display: grid;
  gap: clamp(18px, 3vw, 34px);
}

.page-about .about-section__head {
  position: relative;
}

.page-about .about-section__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(40px, 7vw, 84px);
  line-height: 0.85;
  letter-spacing: -0.05em;
  color: var(--cinnabar);
}

.page-about .about-section__title {
  margin: 0.3em 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.22;
  color: var(--ink);
}

.page-about .about-section__head .rule {
  display: block;
  width: 56px;
  margin-top: 14px;
}

.page-about .about-section__body p {
  margin: 0 0 1em;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.88;
  color: var(--ink-soft);
}

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

/* ---------- 时间线 ---------- */
.page-about .about-timeline__head {
  margin-bottom: clamp(22px, 3.5vw, 40px);
}

.page-about .about-timeline__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-timeline__rail {
  margin: 0;
  border-radius: 22px 4px 22px 4px;
}

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

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(22px, 3.4vw, 36px) clamp(22px, 3vw, 32px);
  border-left: 1px solid var(--about-line);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--gold);
}

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

.page-about .about-timeline__item:last-child::before {
  background: var(--celadon);
  border-color: var(--celadon);
  box-shadow: 0 0 0 4px rgba(79, 125, 110, 0.16);
}

.page-about .about-timeline__idx {
  display: block;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-timeline__name {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.3vw, 23px);
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-timeline__item p {
  margin: 0;
  max-width: 54ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 团队 ---------- */
.page-about .about-team__head {
  margin-bottom: clamp(22px, 3.5vw, 40px);
}

.page-about .about-team__head .lede {
  margin-top: 12px;
  font-size: 15px;
  color: var(--warm);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-team__seals {
  display: grid;
  gap: 12px;
}

.page-about .about-team__seal {
  border: 1px solid var(--ash);
  border-radius: 3px 14px 3px 14px;
  background: var(--paper-lit);
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .about-team__seal:hover,
.page-about .about-team__seal:focus-within {
  border-color: var(--gold);
  background: #fdf9f1;
}

.page-about .about-team__seal[open] {
  border-color: var(--gold);
  background: #fdf9f1;
}

.page-about .about-team__seal-top {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-team__seal-top::-webkit-details-marker {
  display: none;
}

.page-about .about-team__seal-top:focus-visible {
  outline: 2px solid var(--celadon);
  outline-offset: 2px;
  border-radius: 3px 14px 3px 14px;
}

.page-about .about-team__seal-idx {
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--cinnabar);
  flex: 0 0 auto;
}

.page-about .about-team__seal-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--ink);
}

.page-about .about-team__seal-desc {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-team__figure {
  margin: 0;
  border-radius: 14px 3px 14px 3px;
}

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

.page-about .about-team__rhythm li {
  padding: 12px 14px;
  border-left: 3px solid var(--gold-pale);
  background: var(--paper-lit);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-team__rhythm .mono {
  display: block;
  margin-bottom: 4px;
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--cinnabar);
}

/* ---------- 覆盖与指标 ---------- */
.page-about .about-coverage__head {
  margin-bottom: clamp(22px, 3.5vw, 38px);
}

.page-about .about-coverage__grid {
  display: grid;
  gap: clamp(22px, 3.5vw, 40px);
}

.page-about .about-dots {
  height: clamp(112px, 20vw, 168px);
  margin-bottom: 16px;
  border: 1px solid var(--about-line);
  border-radius: 4px 18px 4px 18px;
  background-color: var(--paper-lit);
  background-image: radial-gradient(circle, var(--gold) 0 1.6px, transparent 1.8px);
  background-size: 26px 26px;
  background-position: 13px 13px;
}

.page-about .about-coverage__map-note {
  margin: 0;
  max-width: 46ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-coverage__map-note .mono {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--cinnabar);
}

.page-about .about-metrics {
  margin: 0;
}

.page-about .about-metrics__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 10px;
  border-bottom: 1px solid var(--ash);
  transition: background-color 180ms var(--ease);
}

.page-about .about-metrics__row:first-child {
  border-top: 1px solid var(--ash);
}

.page-about .about-metrics__row:hover {
  background: rgba(228, 207, 160, 0.4);
}

.page-about .about-metrics dt {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--warm);
}

.page-about .about-metrics dd {
  margin: 0;
  flex: 0 0 auto;
  font-size: clamp(16px, 2vw, 21px);
  letter-spacing: -0.02em;
  color: var(--cinnabar);
}

/* ---------- 生态 ---------- */
.page-about .about-eco__head {
  margin-bottom: clamp(22px, 3.5vw, 38px);
}

.page-about .about-eco__head .lede {
  margin-top: 12px;
  font-size: 15px;
  color: var(--warm);
}

.page-about .about-eco__pair {
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
}

.page-about .about-eco__card {
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--paper-lit);
  border: 1px solid var(--ash);
  border-radius: 3px 18px 3px 18px;
}

.page-about .about-eco__num {
  display: block;
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--cinnabar);
}

.page-about .about-eco__card-title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-eco__card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-eco__index {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(22px, 3.5vw, 38px);
}

.page-about .about-eco__group-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--ink);
}

.page-about .about-eco__chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 12px;
  padding: 0;
}

.page-about .about-eco__group p {
  margin: 0;
  max-width: 50ch;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--warm);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding: clamp(20px, 4vw, 48px) 0 clamp(48px, 7vw, 88px);
}

.page-about .about-cta__inner {
  position: relative;
  padding: clamp(24px, 4vw, 52px);
  background: var(--cinnabar-deep);
  color: var(--paper);
  border-radius: 4px 26px 4px 26px;
}

.page-about .about-cta__mark {
  display: inline-block;
  padding: 4px 11px;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--gold-pale);
  border: 1px solid rgba(228, 207, 160, 0.6);
  border-radius: 2px;
}

.page-about .about-cta__title {
  margin: 16px 0 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.25;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(14px, 1.6vw, 16px);
  line-height: 1.9;
  color: rgba(244, 235, 221, 0.86);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-cta .btn--seal {
  background: var(--gold-pale);
  color: var(--cinnabar-deep);
  border-color: var(--gold-pale);
}

.page-about .about-cta .btn--seal:hover {
  background: var(--paper);
  border-color: var(--paper);
}

.page-about .about-cta .btn--ghost {
  color: var(--paper);
  border-color: rgba(228, 207, 160, 0.55);
}

.page-about .about-cta .btn--ghost:hover {
  border-color: var(--gold-pale);
  background: rgba(228, 207, 160, 0.12);
}

/* ---------- 响应式 ---------- */
@media (max-width: 479px) {
  .page-about .about-hero__stats {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .page-about .about-hero__stat-key {
    margin-top: 4px;
  }

  .page-about .about-hero::before {
    width: 68vw;
    height: 128px;
    border-radius: 0 0 0 110px;
  }
}

@media (min-width: 760px) {
  .page-about .about-eco__pair {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-eco__index {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-team__seals {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.82fr);
    align-items: end;
  }

  .page-about .about-section__grid {
    grid-template-columns: minmax(190px, 0.36fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(26px, 5vw, 72px);
  }

  .page-about .about-timeline__grid {
    grid-template-columns: minmax(0, 0.62fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(30px, 5vw, 64px);
  }

  .page-about .about-timeline__rail {
    position: sticky;
    top: 96px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

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

  .page-about .about-coverage__grid {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    align-items: start;
    gap: clamp(30px, 5vw, 64px);
  }
}

@media (min-width: 1080px) {
  .page-about .about-timeline__head,
  .page-about .about-team__head,
  .page-about .about-coverage__head,
  .page-about .about-eco__head {
    max-width: 66ch;
  }
}