.page-about {
  --about-line: rgba(20, 107, 90, 0.16);
  --about-line-soft: rgba(20, 107, 90, 0.09);
}

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

.page-about figure {
  margin: 0;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(18px, 3.5vw, 32px) 0 clamp(36px, 6vw, 68px);
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(47, 165, 138, 0.18), transparent 60%),
    radial-gradient(90% 70% at 0% 110%, rgba(212, 166, 74, 0.12), transparent 62%),
    linear-gradient(180deg, var(--warm), var(--tile));
  border-bottom: 1px solid var(--edge-gold);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
  margin-top: clamp(18px, 3vw, 30px);
}

.page-about .about-hero__copy h1 {
  margin: 0.35em 0 0;
  font-family: var(--font-head);
  font-size: clamp(2.1rem, 6.4vw, 3.7rem);
  line-height: 1.14;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.page-about .about-hero__lead {
  margin: clamp(14px, 2vw, 20px) 0 0;
  max-width: 46ch;
  font-family: var(--font-body);
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  line-height: 1.8;
  color: rgba(27, 27, 24, 0.76);
}

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

.page-about .about-hero__visual {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--edge-gold);
  box-shadow: 0 18px 38px rgba(11, 43, 38, 0.18);
}

.page-about .about-hero__visual img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-hero__visual figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 26px 16px 12px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--warm);
  background: linear-gradient(180deg, rgba(11, 43, 38, 0), rgba(11, 43, 38, 0.86));
}

.page-about .about-figures {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--edge-gold);
  border: 1px solid var(--edge-gold);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-figures__item {
  display: grid;
  gap: 6px;
  padding: clamp(14px, 2.2vw, 22px) clamp(14px, 2vw, 20px);
  background: var(--warm);
}

.page-about .about-figures__num {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  font-weight: 500;
  color: var(--jade);
  line-height: 1.1;
}

.page-about .about-figures__label {
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: rgba(27, 27, 24, 0.62);
}

/* ---------- 起点与定位 ---------- */

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-origin__prose h2 {
  margin: 0.4em 0 0.6em;
  font-family: var(--font-head);
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  line-height: 1.28;
  color: var(--ink);
}

.page-about .about-origin__prose p {
  margin: 0 0 1em;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(27, 27, 24, 0.8);
}

.page-about .about-profile {
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius);
}

.page-about .about-profile h3 {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-size: 1.25rem;
  color: var(--ink);
}

.page-about .about-profile__list {
  margin: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-profile__list > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--about-line-soft);
}

.page-about .about-profile__list > div:last-child {
  border-bottom: 0;
}

.page-about .about-profile__list dt {
  font-size: 0.875rem;
  color: rgba(27, 27, 24, 0.64);
}

.page-about .about-profile__list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--jade);
  white-space: nowrap;
}

/* ---------- 区块标题 ---------- */

.page-about .about-section-head {
  max-width: 62ch;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .about-section-head h2 {
  margin: 0.35em 0 0.5em;
  font-family: var(--font-head);
  font-size: clamp(1.7rem, 3.6vw, 2.6rem);
  line-height: 1.26;
  color: var(--ink);
}

.page-about .about-section-head p:last-child {
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(27, 27, 24, 0.66);
}

.page-about .section--table .about-section-head h2 {
  color: var(--warm);
}

.page-about .section--table .about-section-head p:last-child {
  color: rgba(255, 249, 239, 0.72);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  background: linear-gradient(180deg, var(--tile), var(--warm) 42%, var(--tile));
}

.page-about .about-timeline__layout {
  display: grid;
  gap: clamp(24px, 3.5vw, 44px);
}

.page-about .about-timeline__texture {
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--edge-gold);
}

.page-about .about-timeline__texture img {
  width: 100%;
  aspect-ratio: 16 / 5;
  object-fit: cover;
}

.page-about .about-rail-title {
  margin: 18px 0 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--grey-jade);
}

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

.page-about .about-timeline__toc a {
  display: inline-block;
  padding: 7px 12px;
  border-radius: 999px;
  border: 1px solid var(--about-line);
  background: var(--warm);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--jade);
  text-decoration: none;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.page-about .about-timeline__toc a:hover,
.page-about .about-timeline__toc a[data-active] {
  background: var(--jade);
  border-color: var(--jade);
  color: var(--warm);
}

.page-about .about-timeline__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--jade-bright), rgba(20, 107, 90, 0.08));
}

.page-about .about-tl {
  position: relative;
  padding-left: 38px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 26px;
  width: 16px;
  height: 16px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--warm);
  border: 2px solid var(--jade);
}

.page-about .about-tl--seal::before {
  background: var(--cinnabar);
  border-color: var(--gold);
  box-shadow: 0 0 0 5px rgba(200, 71, 47, 0.14);
}

.page-about .about-tl__card {
  padding: clamp(16px, 2.4vw, 24px);
  border-radius: var(--radius);
  background: var(--warm);
  border: 1px solid var(--edge-ink);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-tl__card:hover {
  transform: translateY(-2px);
  border-color: rgba(47, 165, 138, 0.55);
  box-shadow: 0 12px 26px rgba(11, 43, 38, 0.13);
}

.page-about .about-tl__head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .about-tl__year {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--jade);
  letter-spacing: 0.02em;
}

.page-about .about-tl__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 1.28rem;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-tl__card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(27, 27, 24, 0.72);
}

/* ---------- 团队与审核 ---------- */

.page-about .about-team__grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  align-items: center;
}

.page-about .about-team__copy h2 {
  margin: 0.35em 0 0.55em;
  font-family: var(--font-head);
  font-size: clamp(1.7rem, 3.6vw, 2.5rem);
  line-height: 1.26;
  color: var(--warm);
}

.page-about .about-team__copy > p {
  margin: 0;
  max-width: 52ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(255, 249, 239, 0.78);
}

.page-about .about-team__counts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-about .about-count {
  display: grid;
  gap: 4px;
  padding: 14px 10px;
  text-align: center;
  border-radius: var(--radius-sm);
  background: rgba(255, 249, 239, 0.06);
  border: 1px solid rgba(212, 166, 74, 0.3);
}

.page-about .about-count__n {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 2.6vw, 1.75rem);
  color: var(--gold);
  line-height: 1.1;
}

.page-about .about-count__l {
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
  color: rgba(255, 249, 239, 0.72);
}

.page-about .about-team__media {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(212, 166, 74, 0.34);
}

.page-about .about-team__media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-team__media figcaption {
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  color: rgba(255, 249, 239, 0.7);
  background: rgba(255, 249, 239, 0.05);
}

.page-about .about-audit {
  margin-top: clamp(30px, 4.5vw, 54px);
}

.page-about .about-audit h3 {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-size: 1.35rem;
  color: var(--warm);
}

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

.page-about .about-step {
  padding: 18px;
  border-radius: var(--radius);
  background: rgba(255, 249, 239, 0.05);
  border: 1px solid rgba(212, 166, 74, 0.26);
}

.page-about .about-step__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  color: var(--cinnabar);
  filter: brightness(1.5);
}

.page-about .about-step h4 {
  margin: 6px 0 8px;
  font-family: var(--font-head);
  font-size: 1.1rem;
  color: var(--warm);
}

.page-about .about-step p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: rgba(255, 249, 239, 0.7);
}

.page-about .about-folds {
  display: grid;
  gap: 10px;
  margin-top: clamp(24px, 3.5vw, 36px);
}

.page-about .about-fold {
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: rgba(255, 249, 239, 0.04);
  border: 1px solid rgba(212, 166, 74, 0.28);
  transition: border-color 0.25s ease, background 0.25s ease;
}

.page-about .about-fold[open] {
  border-color: rgba(47, 165, 138, 0.62);
  background: rgba(47, 165, 138, 0.07);
}

.page-about .about-fold summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  color: var(--warm);
}

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

.page-about .about-fold summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--gold);
}

.page-about .about-fold[open] summary::after {
  content: "−";
}

.page-about .about-fold p {
  margin: 10px 0 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(255, 249, 239, 0.74);
}

/* ---------- 内容体系 ---------- */

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

.page-about .about-tree__node {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: clamp(18px, 2.6vw, 24px);
  border-radius: var(--radius);
  background: var(--warm);
  border: 1px solid var(--edge-ink);
  border-top: 3px solid var(--jade);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-tree__node:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 28px rgba(11, 43, 38, 0.12);
}

.page-about .about-tree__index {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-tree__node h3 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 1.3rem;
  color: var(--ink);
}

.page-about .about-tree__node p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(27, 27, 24, 0.72);
}

.page-about .about-tree__link {
  justify-self: start;
  margin-top: 4px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--jade);
  text-decoration: none;
  border-bottom: 1px solid rgba(20, 107, 90, 0.35);
  padding-bottom: 2px;
  transition: color 0.2s, border-color 0.2s;
}

.page-about .about-tree__link:hover {
  color: var(--cinnabar);
  border-color: var(--cinnabar);
}

.page-about .about-path {
  margin-top: clamp(26px, 4vw, 42px);
  padding: clamp(18px, 2.6vw, 26px);
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(20, 107, 90, 0.92), rgba(11, 43, 38, 0.96));
  border: 1px solid var(--edge-gold);
}

.page-about .about-path__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-path__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  counter-reset: path;
}

.page-about .about-path__steps li {
  position: relative;
  padding: 9px 16px;
  border-radius: 999px;
  background: rgba(255, 249, 239, 0.1);
  border: 1px solid rgba(212, 166, 74, 0.42);
  font-size: 0.9375rem;
  color: var(--warm);
}

.page-about .about-path__steps li::after {
  content: "→";
  position: absolute;
  right: -14px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  color: var(--jade-bright);
  font-size: 0.9rem;
}

.page-about .about-path__steps li:last-child::after {
  content: none;
}

.page-about .about-path__steps li:last-child {
  margin-right: 0;
}

/* ---------- 合作生态 ---------- */

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

.page-about .about-eco__card {
  padding: clamp(18px, 2.6vw, 24px);
  border-radius: var(--radius);
  background: var(--warm);
  border: 1px solid rgba(20, 107, 90, 0.18);
  border-left: 3px solid var(--jade-bright);
}

.page-about .about-eco__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 1.2rem;
  color: var(--inky, var(--ink));
}

.page-about .about-eco__card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(27, 27, 24, 0.72);
}

.page-about .about-topics {
  display: grid;
  gap: 10px;
  margin-top: clamp(24px, 3.5vw, 36px);
  padding: clamp(18px, 2.6vw, 26px);
  border-radius: var(--radius);
  background: var(--warm);
  border: 1px dashed rgba(200, 71, 47, 0.4);
}

.page-about .about-topics__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  color: var(--cinnabar);
}

.page-about .about-topics__v {
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(27, 27, 24, 0.78);
}

/* ---------- 更新节奏与收尾 ---------- */

.page-about .about-next {
  background: linear-gradient(180deg, var(--warm), var(--tile));
}

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

.page-about .about-cadence {
  padding: clamp(18px, 2.6vw, 24px);
  border-radius: var(--radius);
  background: var(--warm);
  border: 1px solid var(--edge-ink);
  border-bottom: 3px solid var(--gold);
}

.page-about .about-cadence__k {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(212, 166, 74, 0.16);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--cinnabar);
}

.page-about .about-cadence h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 1.22rem;
  color: var(--ink);
}

.page-about .about-cadence p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(27, 27, 24, 0.72);
}

.page-about .about-cta {
  display: grid;
  gap: 16px;
  margin-top: clamp(28px, 4vw, 44px);
  padding: clamp(22px, 3.4vw, 34px);
  border-radius: var(--radius);
  background: linear-gradient(115deg, var(--table-green), var(--jade));
  border: 1px solid var(--edge-gold);
}

.page-about .about-cta > p {
  margin: 0;
  max-width: 54ch;
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(255, 249, 239, 0.86);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
  }

  .page-about .about-hero__visual {
    margin-top: clamp(10px, 2vw, 26px);
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-timeline__layout {
    grid-template-columns: 258px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-timeline__rail {
    position: sticky;
    top: calc(var(--header-h) + 22px);
    align-self: start;
  }

  .page-about .about-timeline__toc ul {
    flex-direction: column;
    flex-wrap: nowrap;
  }

  .page-about .about-timeline__toc a {
    display: block;
    border-radius: var(--radius-sm);
  }

  .page-about .about-tl:nth-child(even) {
    padding-left: 72px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
  }

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

  .page-about .about-tree {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__card,
  .page-about .about-tree__node,
  .page-about .about-timeline__toc a {
    transition: none;
  }

  .page-about .about-tl__card:hover,
  .page-about .about-tree__node:hover {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>

.page-about {
  --inky: var(--ink);
}