.page-about {
  --about-idx-w: 168px;
  --about-kicker: var(--gobi);
  background: var(--snow);
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(18px, 3vw, 30px) clamp(34px, 5vw, 64px);
}

.page-about .about-crumbs {
  margin-bottom: clamp(14px, 2.4vw, 24px);
  font-size: 12px;
  letter-spacing: 0.14em;
}

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid var(--line);
  padding: clamp(22px, 4vw, 48px);
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  background:
    linear-gradient(180deg, rgba(231, 216, 189, 0.42) 0%, rgba(247, 244, 236, 0) 46%);
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 10px;
  background: repeating-linear-gradient(90deg, var(--ink) 0 1px, transparent 1px 16px);
  opacity: 0.22;
}

.page-about .about-hero__kicker {
  color: var(--about-kicker);
  margin-bottom: 14px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6.4vw, 74px);
  line-height: 0.98;
  letter-spacing: -0.01em;
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  max-width: 14ch;
}

.page-about .about-hero__lead {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--charcoal);
  max-width: 60ch;
  margin: 0 0 clamp(22px, 3vw, 32px);
}

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

.page-about .about-btn-dark {
  border-color: var(--ink);
  color: var(--ink);
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-stats__item {
  background: var(--snow);
  padding: 14px 12px 14px 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
}

.page-about .about-stats__label {
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.08em;
  color: var(--slate);
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-shell {
  display: grid;
  gap: clamp(20px, 4vw, 48px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-index {
  border-top: 3px solid var(--ink);
  padding-top: 12px;
}

.page-about .about-index__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--slate);
  text-transform: uppercase;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 8px;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 10px 6px 8px;
  border: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
  font-size: 13px;
  letter-spacing: 0.06em;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-index__link .num {
  font-size: 11px;
  color: var(--gobi);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--snow);
}

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

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-block: clamp(30px, 4.4vw, 52px);
  scroll-margin-top: 96px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-section--band {
  background: var(--sand);
  border-top: 0;
  padding: clamp(24px, 3.6vw, 44px);
  display: flow-root;
}

.page-about .about-section--pine {
  background: var(--pine);
  color: var(--snow);
  border-top: 0;
  padding: clamp(24px, 3.6vw, 44px);
}

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 10px;
  margin-bottom: clamp(14px, 2vw, 20px);
}

.page-about .about-section--pine .about-section__head {
  border-bottom-color: var(--line-light);
}

.page-about .about-section__index {
  font-size: 12px;
  color: var(--gobi);
  letter-spacing: 0.1em;
  flex: none;
}

.page-about .about-section__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.1vw, 34px);
  line-height: 1.16;
  margin: 0;
  letter-spacing: 0.005em;
}

.page-about .about-section__lead {
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.8;
  color: var(--charcoal);
  max-width: 62ch;
  margin: 0 0 clamp(16px, 2.4vw, 24px);
}

.page-about .about-section--pine .about-section__lead {
  color: rgba(247, 244, 236, 0.82);
}

.page-about .about-section p {
  max-width: 62ch;
  line-height: 1.85;
  margin: 0 0 14px;
}

.page-about .about-section__note {
  margin-top: clamp(16px, 2.4vw, 24px);
  padding-left: 14px;
  border-left: 3px solid var(--gobi);
  font-size: 14px;
  line-height: 1.8;
  color: var(--charcoal);
}

.page-about .about-section a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--gobi);
  text-underline-offset: 3px;
  text-decoration-thickness: 2px;
}

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
}

.page-about .about-figure--tight {
  margin-bottom: 0;
}

.page-about .about-figure .media-frame {
  width: 100%;
}

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

.page-about .about-caption {
  margin: 8px 0 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate);
  max-width: 60ch;
  line-height: 1.6;
}

/* ---------- 引用 ---------- */
.page-about .about-quote {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: clamp(18px, 2.6vw, 26px) clamp(18px, 2.8vw, 30px);
  background: var(--ink);
  color: var(--snow);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
  max-width: 64ch;
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 2.4vw, 26px);
  line-height: 1.32;
  letter-spacing: 0.01em;
}

/* ---------- 五道手 ---------- */
.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .flow__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  column-gap: 14px;
  align-items: start;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .flow__no {
  font-size: 15px;
  color: var(--gobi);
  line-height: 1.5;
}

.page-about .flow__title {
  grid-column: 2;
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .flow__text {
  grid-column: 2;
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--charcoal);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team-card {
  background: var(--snow);
  padding: clamp(16px, 2.2vw, 24px);
}

.page-about .team-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.4vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
  letter-spacing: -0.03em;
}

.page-about .team-card__role {
  margin: 8px 0 6px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.page-about .team-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--charcoal);
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  border-top: 1px solid rgba(11, 13, 12, 0.22);
}

.page-about .tl-item {
  border-bottom: 1px solid rgba(11, 13, 12, 0.22);
}

.page-about .tl-item__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) 20px;
  align-items: center;
  gap: 12px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-item__year {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.8vw, 28px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .tl-item__title {
  font-size: clamp(14px, 1.7vw, 16px);
  line-height: 1.5;
  font-weight: 600;
}

.page-about .tl-item__sign {
  position: relative;
  width: 14px;
  height: 14px;
  justify-self: end;
}

.page-about .tl-item__sign::before,
.page-about .tl-item__sign::after {
  content: "";
  position: absolute;
  background: var(--gobi);
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.page-about .tl-item__sign::before {
  inset: 6px 0 auto 0;
  height: 2px;
}

.page-about .tl-item__sign::after {
  inset: 0 6px 0 auto;
  width: 2px;
}

.page-about .tl-item[open] .tl-item__sign::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .tl-item__body {
  padding: 0 0 18px calc(1em + 12px);
}

.page-about .tl-item__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--charcoal);
  max-width: 58ch;
}

/* ---------- 区域 ---------- */
.page-about .region-layout {
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
  margin-bottom: clamp(16px, 2.4vw, 22px);
}

.page-about .region-nodes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .region-node {
  border: 1px solid var(--line);
  border-left: 4px solid var(--glacier);
  padding: 12px 14px;
  background: var(--snow);
  transition: border-left-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .region-node:hover,
.page-about .region-node:focus-within {
  border-left-color: var(--gobi);
  background: var(--peach);
}

.page-about .region-node strong {
  display: block;
  font-size: 14px;
  letter-spacing: 0.06em;
  margin-bottom: 4px;
}

.page-about .region-node span {
  display: block;
  font-size: 13px;
  line-height: 1.7;
  color: var(--charcoal);
}

/* ---------- 协作 ---------- */
.page-about .network-grid {
  display: grid;
  gap: 1px;
  background: rgba(247, 244, 236, 0.2);
  border-top: 1px solid var(--line-light);
  border-bottom: 1px solid var(--line-light);
}

.page-about .partner {
  padding: 16px 0 18px;
  border-bottom: 1px solid var(--line-light);
}

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

.page-about .partner__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
  letter-spacing: -0.02em;
}

.page-about .partner__role {
  margin: 8px 0 6px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--snow);
}

.page-about .partner__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(247, 244, 236, 0.78);
}

.page-about .network-usage {
  margin-top: clamp(20px, 3vw, 28px);
  padding: clamp(16px, 2.4vw, 24px);
  background: rgba(11, 13, 12, 0.32);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .network-usage__label {
  color: var(--amber);
  margin: 0 0 12px;
}

.page-about .network-usage__list {
  list-style: none;
  margin: 0 0 12px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .network-usage__list li {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(247, 244, 236, 0.85);
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
}

.page-about .network-usage__list .num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  color: var(--snow);
  letter-spacing: -0.02em;
}

.page-about .network-usage__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(247, 244, 236, 0.7);
  max-width: 56ch;
}

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

.page-about .next-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(16px, 2.2vw, 22px);
  border: 1px solid var(--line);
  border-left: 4px solid var(--gobi);
  text-decoration: none;
  color: var(--ink);
  background: var(--snow);
  transition: background 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  background: var(--peach);
  transform: translateX(3px);
}

.page-about .next-card__label {
  color: var(--slate);
  font-size: 11px;
}

.page-about .next-card__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.25;
}

.page-about .next-card__text {
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--charcoal);
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

  .page-about .network-usage__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .network-usage__list li {
    flex-direction: column;
    gap: 2px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__frame {
    grid-template-columns: minmax(0, 1fr) 280px;
    align-items: start;
  }

  .page-about .about-stats {
    grid-template-columns: minmax(0, 1fr);
    border-top: 1px solid var(--line);
    align-self: stretch;
  }

  .page-about .about-stats__item {
    padding: 14px 0;
    border-bottom: 1px solid var(--line-soft);
  }

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

  .page-about .region-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .flow__item {
    grid-template-columns: 64px minmax(0, 1fr) minmax(0, 1.4fr);
    column-gap: 20px;
    align-items: baseline;
  }

  .page-about .flow__title {
    grid-column: 2;
    margin: 0;
  }

  .page-about .flow__text {
    grid-column: 3;
  }
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-idx-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 92px;
    align-self: start;
  }

  .page-about .about-index__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
  }

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

  .page-about .about-index__link {
    border: 0;
    width: 100%;
    padding: 10px 0;
    font-size: 13px;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    background: transparent;
    color: var(--gobi);
    padding-left: 6px;
  }

  .page-about .about-index__link:hover .num,
  .page-about .about-index__link:focus-visible .num {
    color: var(--ink);
  }

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

  .page-about .network-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 24px;
  }

  .page-about .partner {
    border-bottom: 0;
    padding-bottom: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .region-node,
  .page-about .next-card,
  .page-about .tl-item__sign::before,
  .page-about .tl-item__sign::after {
    transition: none;
  }

  .page-about .next-card:hover,
  .page-about .next-card:focus-visible {
    transform: none;
  }
}
<<<END>>>