.page-about {
  --about-node-gap: 16px;
  background: var(--cream);
  color: var(--text);
}

.page-about .breadcrumb {
  padding-top: 18px;
  font-size: 13px;
  color: var(--text-soft);
}

.page-about .breadcrumb a {
  color: var(--jade);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  text-decoration: underline;
}

/* ---------- 封面 ---------- */

.page-about .about-cover {
  padding-block: 26px 34px;
}

.page-about .about-cover__grid {
  display: grid;
  gap: 26px;
  min-width: 0;
}

.page-about .about-cover__head {
  min-width: 0;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--red-clay);
}

.page-about .about-cover__title {
  margin: 12px 0 0;
  font-size: clamp(30px, 7vw, 60px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--ink);
}

.page-about .about-cover__lead {
  max-width: 36em;
  margin-top: 18px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-cover__wing {
  min-width: 0;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
  padding: 18px 20px 6px;
}

.page-about .about-vnote {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--stone);
}

.page-about .about-factlist {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .about-factlist li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 11px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-factlist .mono {
  flex: 0 0 auto;
  min-width: 3.6em;
  font-size: 24px;
  font-weight: 700;
  color: var(--red-clay);
  font-variant-numeric: tabular-nums;
}

.page-about .about-factlist span:last-child {
  font-size: 13px;
  color: var(--text-soft);
}

/* ---------- 筛选条 ---------- */

.page-about .about-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}

/* ---------- 章节通用 ---------- */

.page-about .about-block {
  padding-block: clamp(40px, 7vw, 74px);
}

.page-about .about-block .section-head {
  max-width: 44em;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-block .section-title {
  margin: 10px 0 0;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-block .section-note {
  margin: 12px 0 0;
  font-size: 14px;
  color: var(--text-soft);
}

.page-about .prose {
  max-width: 36em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-soft);
}

/* ---------- 时间轴 ---------- */

.page-about .about-stage {
  display: grid;
  gap: 32px;
  min-width: 0;
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 24px;
  left: 5px;
  width: 1px;
  background: var(--line-strong);
}

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

.page-about .about-node {
  border-bottom: 1px solid var(--line);
}

.page-about .about-node__summary {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr);
  gap: var(--about-node-gap);
  align-items: start;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node__dot {
  position: relative;
  z-index: 1;
  width: 11px;
  height: 11px;
  margin-top: 9px;
  border-radius: 50%;
  background: var(--red-clay);
  box-shadow: 0 0 0 4px var(--cream);
}

.page-about .about-node[open] .about-node__dot {
  background: var(--sun);
  box-shadow: 0 0 0 4px var(--cream), 0 0 0 5px rgba(176, 58, 31, 0.3);
}

.page-about .about-node__year {
  display: block;
  font-size: clamp(26px, 5.5vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--red-clay);
  font-variant-numeric: tabular-nums;
}

.page-about .about-node__title {
  display: block;
  margin-top: 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-node__body {
  padding: 0 0 20px calc(12px + var(--about-node-gap));
}

.page-about .about-node__body p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-soft);
}

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

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

.page-about .about-stage__figure .figure__frame {
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--white);
}

.page-about .figure__caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--stone);
}

/* ---------- 制度运转 ---------- */

.page-about .about-system {
  display: grid;
  gap: 30px;
  min-width: 0;
}

.page-about .about-system__body,
.page-about .about-system__aside {
  min-width: 0;
}

.page-about .about-cycle {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-cycle__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-cycle__idx {
  grid-row: 1 / span 2;
  font-size: 15px;
  font-weight: 700;
  color: var(--jade);
  letter-spacing: 0.04em;
}

.page-about .about-cycle__title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-cycle__item p {
  grid-column: 2;
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-system__aside {
  display: grid;
  gap: 20px;
  align-content: start;
}

.page-about .about-quote {
  margin: 0;
  background: var(--paper);
  border-left: 4px solid var(--red-clay);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  padding: 20px 22px;
}

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

.page-about .about-system__card {
  box-shadow: var(--shadow-1);
}

.page-about .about-system__card .card__meta {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--stone);
}

.page-about .about-system__card .card__title {
  margin: 8px 0 10px;
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-system__card p {
  margin: 0 0 8px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-system__link {
  margin: 12px 0 0;
}

.page-about .about-system__link a {
  color: var(--jade);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
}

/* ---------- 合作网络 ---------- */

.page-about .about-network {
  display: grid;
  gap: 32px;
  min-width: 0;
}

.page-about .about-network__text,
.page-about .about-network__figure {
  min-width: 0;
}

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

.page-about .about-network__figure .figure__frame {
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--white);
}

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

.page-about .about-network__caption {
  caption-side: top;
  text-align: left;
  padding-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--stone);
}

/* ---------- 五步流程 ---------- */

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

.page-about .about-flow__step {
  position: relative;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 20px 20px 18px;
  box-shadow: var(--shadow-1);
  transition: border-color 240ms var(--ease), transform 240ms var(--ease);
}

.page-about .about-flow__step:hover,
.page-about .about-flow__step:focus-within {
  border-color: var(--clay-light);
  transform: translateY(-3px);
}

.page-about .about-flow__num {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--white);
  background: var(--red-clay);
  border-radius: var(--radius);
  padding: 3px 8px;
}

.page-about .about-flow__title {
  margin: 14px 0 8px;
  font-size: 17px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-flow__more {
  margin-top: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 260ms var(--ease), opacity 200ms var(--ease), margin-top 200ms var(--ease);
}

.page-about .about-flow__step:hover .about-flow__more,
.page-about .about-flow__step:focus-within .about-flow__more,
.page-about .about-flow__step:focus .about-flow__more {
  max-height: 260px;
  opacity: 1;
  margin-top: 14px;
}

.page-about .about-flow__more-title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--jade);
}

.page-about .about-flow__more ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-about .about-flow__more li {
  position: relative;
  padding-left: 14px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-soft);
  border-top: 1px dashed var(--line);
  padding-top: 6px;
}

.page-about .about-flow__more li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 13px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--jade);
}

.page-about .about-flow__note {
  margin: 26px 0 0;
  padding: 16px 18px;
  border-left: 4px solid var(--sun);
  background: rgba(233, 169, 60, 0.12);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  gap: 30px;
  min-width: 0;
}

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

.page-about .about-team__figure .figure__frame {
  overflow: hidden;
  border: 1px solid var(--line-inverse);
  background: rgba(245, 240, 230, 0.06);
}

.page-about .about-team__figure .figure__caption {
  color: rgba(245, 240, 230, 0.6);
}

.page-about .about-team__body {
  min-width: 0;
}

.page-about .about-team__eyebrow {
  color: var(--sun);
}

.page-about .about-team__title {
  margin: 10px 0 0;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.22;
  letter-spacing: -0.015em;
  font-weight: 800;
  color: var(--cream);
}

.page-about .about-team__lead {
  margin: 16px 0 0;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(245, 240, 230, 0.78);
}

.page-about .about-team__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-team__list li {
  padding: 16px 0;
  border-top: 1px solid var(--line-inverse);
}

.page-about .about-team__tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--jade);
  background: rgba(15, 122, 92, 0.22);
  border: 1px solid rgba(15, 122, 92, 0.5);
  border-radius: var(--radius);
  padding: 2px 8px;
}

.page-about .about-team__list h3 {
  margin: 10px 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .about-team__list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(245, 240, 230, 0.72);
}

/* ---------- 长期收益 ---------- */

.page-about .about-benefits {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-benefits__item {
  position: relative;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 24px 22px 22px;
  box-shadow: var(--shadow-1);
}

.page-about .about-benefits__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 22px;
  width: 40px;
  height: 3px;
  background: var(--clay-light);
}

.page-about .about-benefits__idx {
  display: block;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--stone);
}

.page-about .about-benefits__item h3 {
  margin: 12px 0 10px;
  font-size: 19px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-benefits__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .about-cta {
  margin-top: clamp(30px, 5vw, 52px);
  display: grid;
  gap: 18px;
  padding: 26px 24px;
  background: var(--moss);
  border-radius: var(--radius-lg);
}

.page-about .about-cta__text {
  margin: 0;
  font-size: clamp(18px, 2.6vw, 24px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--cream);
}

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

.page-about .about-cta .btn--primary {
  background: var(--red-clay);
  color: var(--white);
  border-color: var(--red-clay);
}

.page-about .about-cta .btn--ghost {
  background: transparent;
  color: var(--cream);
  border-color: rgba(245, 240, 230, 0.45);
}

.page-about .about-cta .btn--ghost:hover {
  border-color: var(--sun);
  color: var(--sun);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-benefits {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 32px 30px;
  }
}

@media (min-width: 900px) {
  .page-about .about-cover {
    padding-block: 34px 46px;
  }

  .page-about .about-cover__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-stage {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-system {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-network {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-network__figure .figure__frame {
    transform: translateY(18px);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-team__figure .figure__frame {
    transform: translateY(10px);
  }

  .page-about .about-team__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 28px;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .about-flow__step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 30px;
    right: -8px;
    width: 16px;
    height: 1px;
    background: var(--jade);
  }

  .page-about .about-flow__step {
    padding: 22px 18px 20px;
  }

  .page-about .about-flow__more {
    max-height: 0;
  }

  .page-about .about-node__body {
    padding-right: 24px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-vnote {
    writing-mode: vertical-rl;
    height: 84px;
    letter-spacing: 0.22em;
  }

  .page-about .about-cover__wing {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 20px;
    padding: 22px 24px 12px;
  }

  .page-about .about-factlist {
    margin-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-flow__step,
  .page-about .about-flow__more,
  .page-about .about-network__figure .figure__frame,
  .page-about .about-team__figure .figure__frame {
    transition: none;
    transform: none;
  }

  .page-about .about-flow__more {
    max-height: none;
    opacity: 1;
    margin-top: 12px;
  }
}