.page-about {
  --about-pad: clamp(18px, 4vw, 56px);
  --about-year-size: clamp(38px, 8vw, 64px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(28px, 5vw, 64px);
}

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

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

.page-about .about-hero__main h1 {
  margin: 14px 0 0;
  font-size: clamp(34px, 7vw, 64px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--chalk);
  max-width: 14em;
}

.page-about .about-hero__lede {
  margin: clamp(18px, 3vw, 28px) 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--chalk);
}

.page-about .about-hero__side {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-about .about-hero__note {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--moss);
  line-height: 1.5;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 160px;
    align-items: end;
  }
  .page-about .about-hero__side {
    border-top: 0;
    border-left: 1px solid var(--line);
    padding-top: 0;
    padding-left: 18px;
    display: flex;
    justify-content: flex-start;
  }
  .page-about .about-hero__note {
    writing-mode: vertical-rl;
    letter-spacing: 0.24em;
  }
}

/* ---------- 年份轴 ---------- */
.page-about .about-axis__head {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-axis__title {
  margin: 0;
  font-size: clamp(26px, 4.6vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--chalk);
}

.page-about .about-axis__intro {
  margin: 0;
  max-width: 30em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--moss);
}

.page-about .about-axis__figure {
  margin: 0 0 clamp(28px, 4vw, 48px);
}

.page-about .about-timeline {
  position: relative;
  padding-left: 20px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(to bottom, rgba(201, 242, 76, 0.55), rgba(140, 216, 190, 0.12));
}

@media (min-width: 768px) {
  .page-about .about-timeline {
    padding-left: 32px;
  }
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -20px;
  top: 28px;
  width: 9px;
  height: 9px;
  margin-left: -4.5px;
  background: var(--moss);
  transform: rotate(45deg);
  transition: background 160ms ease;
}

@media (min-width: 768px) {
  .page-about .about-node::before {
    left: -32px;
  }
}

.page-about .about-node[open]::before,
.page-about .about-node:hover::before {
  background: var(--lime);
}

.page-about .about-node > summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  gap: 6px;
  padding: 20px 34px 20px 0;
  position: relative;
}

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

.page-about .about-node > summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 18px;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--moss);
  transition: color 160ms ease;
}

.page-about .about-node[open] > summary::after {
  content: "−";
  color: var(--lime);
}

.page-about .about-node__year {
  font-family: var(--font-mono);
  font-size: var(--about-year-size);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--moss);
  transition: color 160ms ease;
}

.page-about .about-node[open] .about-node__year {
  color: var(--lime);
}

.page-about .about-node__text {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.page-about .about-node__label {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mint);
}

.page-about .about-node__desc {
  display: block;
  font-size: 15px;
  line-height: 1.7;
  color: var(--chalk);
}

.page-about .about-node__body {
  padding: 0 0 22px;
}

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

@media (min-width: 768px) {
  .page-about .about-node > summary {
    grid-template-columns: 140px minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
    padding: 24px 40px 24px 0;
  }
  .page-about .about-node__body {
    padding-left: 160px;
    padding-bottom: 26px;
  }
}

/* ---------- 三条能力线 ---------- */
.page-about .about-skills {
  padding: clamp(24px, 4vw, 48px);
  color: var(--ink-paper);
}

.page-about .about-skills__head {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-skills__eyebrow {
  color: rgba(20, 33, 28, 0.62);
}

.page-about .about-skills__eyebrow::before {
  background: var(--ink-paper);
}

.page-about .about-skills__title {
  margin: 12px 0 0;
  font-size: clamp(24px, 4.2vw, 36px);
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--ink-paper);
  max-width: 16em;
}

.page-about .about-skills__tabs .tabs__list {
  border-bottom: 1px solid rgba(20, 33, 28, 0.2);
  gap: 8px;
  display: flex;
  flex-wrap: wrap;
}

.page-about .about-skills__tabs .tabs__tab {
  background: transparent;
  border: 0;
  padding: 10px 4px;
  margin-right: 18px;
  font-size: 14px;
  letter-spacing: 0.06em;
  color: rgba(20, 33, 28, 0.5);
  border-bottom: 2px solid transparent;
  cursor: pointer;
  font-family: inherit;
}

.page-about .about-skills__tabs .tabs__tab[aria-selected="true"] {
  color: var(--ink-paper);
  border-bottom-color: var(--ink-paper);
  font-weight: 700;
}

.page-about .about-skills__tabs .tabs__tab:focus-visible {
  outline: 2px solid var(--ink-paper);
  outline-offset: 2px;
}

.page-about .about-skills__panel {
  padding-top: clamp(18px, 3vw, 28px);
}

.page-about .about-skills__lede {
  margin: 0 0 20px;
  max-width: 32em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(20, 33, 28, 0.75);
}

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

.page-about .about-stats__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 3px;
  align-items: baseline;
  padding: 14px 0;
  border-top: 1px solid rgba(20, 33, 28, 0.16);
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink-paper);
}

.page-about .about-stats__unit {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink-paper);
  font-weight: 600;
}

.page-about .about-stats__note {
  grid-column: 1 / -1;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(20, 33, 28, 0.66);
}

@media (min-width: 760px) {
  .page-about .about-stats__item {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: baseline;
  }
  .page-about .about-stats__note {
    grid-column: 2;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

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

.page-about .about-team__title {
  margin: 12px 0 18px;
  font-size: clamp(26px, 4.6vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--chalk);
  max-width: 14em;
}

.page-about .about-team__body {
  margin: 0 0 16px;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--chalk);
}

.page-about .about-team__actions {
  margin-top: 22px;
}

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

.page-about .about-team__map {
  margin: clamp(28px, 4vw, 44px) 0 0;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners__head {
  max-width: 34em;
  margin-bottom: clamp(22px, 3vw, 32px);
}

.page-about .about-partners__title {
  margin: 0 0 12px;
  font-size: clamp(26px, 4.6vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--chalk);
}

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

.page-about .about-partners__trace {
  display: block;
  width: 100%;
  height: 40px;
  margin-bottom: 8px;
}

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

.page-about .about-tree__node {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 12px;
  row-gap: 4px;
  align-items: center;
  padding: 16px 18px;
  background: var(--pitch-900);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  border-left: 2px solid var(--line-strong);
  transition: border-color 160ms ease, background 160ms ease;
}

.page-about .about-tree__node:hover,
.page-about .about-tree__node:focus-within,
.page-about .about-tree__node:focus {
  border-left-color: var(--lime);
  background: var(--pitch-800);
  outline: none;
}

.page-about .about-tree__box {
  grid-row: span 2;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  color: var(--lime);
  border: 1px solid var(--line-strong);
  transform: rotate(0deg);
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
}

.page-about .about-tree__label {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--chalk);
}

.page-about .about-tree__hint {
  font-size: 13px;
  line-height: 1.7;
  color: var(--moss);
}

@media (min-width: 760px) {
  .page-about .about-tree {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
  .page-about .about-tree__node {
    grid-template-columns: auto minmax(0, 1fr);
    grid-template-rows: auto auto;
    column-gap: 16px;
    padding: 20px 22px;
  }
  .page-about .about-tree__box {
    width: 54px;
    height: 54px;
    font-size: 20px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-tree {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-tree__node {
    grid-template-columns: 1fr;
    justify-items: start;
    row-gap: 8px;
    padding: 20px;
  }
  .page-about .about-tree__box {
    grid-row: auto;
  }
}

.page-about .about-partners__foot {
  margin-top: clamp(24px, 4vw, 40px);
  padding-top: 20px;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 18px;
  align-items: center;
}

.page-about .about-partners__copy {
  margin: 0;
  max-width: 32em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--chalk);
}

@media (min-width: 860px) {
  .page-about .about-partners__foot {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 32px;
  }
}

/* ---------- 图片兜底 ---------- */
.page-about .figure__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
<<<END>>>