.page-about {
  --about-gap: clamp(16px, 2.4vw, 30px);
  --about-pad: clamp(20px, 4vw, 56px);
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(14px, 2.4vw, 30px) var(--about-pad) clamp(56px, 7vw, 100px);
  color: var(--ink);
  font-family: var(--font-body);
}

.page-about p {
  line-height: 1.78;
  margin: 0 0 1em;
}

.page-about h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.6vw, 2.4rem);
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--ink-deep);
  margin: 10px 0 16px;
}

.page-about h3 {
  font-family: var(--font-head);
  font-weight: 800;
  color: var(--ink-deep);
}

.page-about .media {
  margin: 0;
  display: block;
  border: 1px solid var(--line);
  background: var(--paper-warm);
  overflow: hidden;
}

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

.page-about .media-cap {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--blue);
}

/* 面包屑 */
.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  list-style: none;
  margin: 0 0 clamp(18px, 3vw, 34px);
  padding: 0;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--blue);
}

.page-about .crumbs li {
  display: flex;
  align-items: center;
}

.page-about .crumbs li + li::before {
  content: "/";
  margin: 0 8px;
  color: var(--blue-mist);
}

.page-about .crumbs a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .12s ease, color .12s ease;
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--red);
  border-bottom-color: var(--red);
}

.page-about .crumbs [aria-current="page"] {
  color: var(--ink-deep);
  font-weight: 700;
}

/* 首屏 */
.page-about .about-open {
  padding-bottom: clamp(28px, 4vw, 48px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-open h1 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(2.1rem, 7vw, 4.4rem);
  line-height: 1.06;
  letter-spacing: -.035em;
  color: var(--ink-deep);
  margin: 0 0 clamp(18px, 3vw, 28px);
}

.page-about .open-inner {
  display: grid;
  gap: var(--about-gap);
}

.page-about .open-side .lede {
  max-width: 46ch;
  margin: 0 0 clamp(18px, 2.6vw, 26px);
}

.page-about .open-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (min-width: 880px) {
  .page-about .open-inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: end;
  }
}

/* 通用区块节奏 */
.page-about .about-block {
  padding-top: clamp(40px, 6vw, 76px);
  padding-bottom: clamp(40px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
}

/* 品牌起点 */
.page-about .origin-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .origin-copy p {
  max-width: 52ch;
}

.page-about .origin-note {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: .92rem;
  color: var(--blue);
}

.page-about .origin-figure .media {
  aspect-ratio: 10 / 7;
}

@media (min-width: 880px) {
  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }

  .page-about .origin-figure {
    margin-top: 28px;
  }
}

/* 时间轴 */
.page-about .tl-head {
  margin-bottom: clamp(22px, 3.4vw, 36px);
}

.page-about .tl-lede {
  max-width: 52ch;
  color: var(--ink);
}

.page-about .tl {
  list-style: none;
  margin: 0 0 clamp(26px, 4vw, 44px);
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .tl-node {
  position: relative;
  margin-left: 4px;
  padding: 0 0 26px 26px;
  border-left: 1px solid var(--line);
}

.page-about .tl-node:last-child {
  padding-bottom: 0;
}

.page-about .tl-dot {
  position: absolute;
  left: -4px;
  top: 5px;
  width: 7px;
  height: 7px;
  background: var(--blue);
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(1.35rem, 3.2vw, 1.9rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ink-deep);
  font-variant-numeric: tabular-nums;
  margin-bottom: 6px;
  transition: color .12s ease;
}

.page-about .tl-node h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  line-height: 1.4;
}

.page-about .tl-node p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.65;
  color: var(--ink);
}

.page-about .tl-node:hover .tl-year,
.page-about .tl-node:focus-within .tl-year {
  color: var(--red);
}

.page-about .tl-node:hover .tl-dot,
.page-about .tl-node:focus-within .tl-dot {
  background: var(--red);
}

.page-about .tl-figure .media {
  aspect-ratio: 2 / 1;
}

@media (min-width: 900px) {
  .page-about .tl {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    border-top: 1px solid var(--line);
  }

  .page-about .tl-node {
    margin-left: 0;
    padding: 26px 16px 0 0;
    border-left: 0;
  }

  .page-about .tl-node:last-child {
    padding-bottom: 0;
    padding-right: 0;
  }

  .page-about .tl-dot {
    left: 0;
    top: -4px;
  }
}

/* 规模 */
.page-about .scale-head {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .scale-lede {
  max-width: 54ch;
}

.page-about .scale-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-bottom: 18px;
}

.page-about .stat {
  background: var(--paper-white);
  padding: clamp(16px, 2.4vw, 26px);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .stat-num {
  font-family: var(--font-num);
  font-size: clamp(1.7rem, 4.2vw, 2.8rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--blue);
  font-variant-numeric: tabular-nums;
}

.page-about .stat-num em {
  font-style: normal;
  font-size: .46em;
  margin-left: 3px;
  color: var(--blue-mid);
}

.page-about .stat-cap {
  font-size: .8rem;
  line-height: 1.5;
  letter-spacing: .04em;
  color: var(--ink);
}

.page-about .scale-note {
  font-size: .92rem;
  color: var(--ink);
}

.page-about .scale-note a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid var(--blue-mist);
}

.page-about .scale-note a:hover,
.page-about .scale-note a:focus-visible {
  color: var(--red);
  border-bottom-color: var(--red);
}

@media (min-width: 780px) {
  .page-about .scale-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

/* 团队 */
.page-about .team-head {
  display: grid;
  gap: var(--about-gap);
  margin-bottom: clamp(22px, 3.4vw, 36px);
}

.page-about .team-copy .lede {
  max-width: 54ch;
  margin-bottom: 0;
}

.page-about .team-figure {
  margin: 0;
}

.page-about .team-figure .media {
  aspect-ratio: 3 / 2;
}

.page-about .team-cards {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-bottom: clamp(22px, 3.4vw, 34px);
}

.page-about .team-card {
  background: var(--paper-warm);
  padding: 18px 20px;
}

.page-about .team-card summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: -.01em;
  color: var(--ink-deep);
  transition: color .12s ease;
}

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

.page-about .team-card summary::after {
  content: "+";
  font-family: var(--font-num);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--blue);
  flex: none;
}

.page-about .team-card[open] summary::after {
  content: "–";
}

.page-about .team-card summary:hover,
.page-about .team-card summary:focus-visible {
  color: var(--blue);
}

.page-about .team-card summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

.page-about .team-card p {
  margin: 12px 0 0;
  font-size: .92rem;
  line-height: 1.72;
}

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

.page-about .rhythm li {
  display: grid;
  gap: 2px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .rhythm-k {
  font-family: var(--font-num);
  font-size: .82rem;
  letter-spacing: .08em;
  color: var(--red);
}

.page-about .rhythm-v {
  font-size: .92rem;
  line-height: 1.6;
  color: var(--ink);
}

@media (min-width: 880px) {
  .page-about .team-head {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
    align-items: end;
  }

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

  .page-about .rhythm li {
    grid-template-columns: 130px minmax(0, 1fr);
    align-items: baseline;
    gap: 18px;
  }
}

/* 2025 站点 */
.page-about .site2025-grid {
  display: grid;
  gap: clamp(24px, 3.6vw, 42px);
}

.page-about .site2025-copy p {
  max-width: 54ch;
}

.page-about .site2025-list {
  list-style: none;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .site2025-list li {
  display: grid;
  gap: 3px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .site2025-list .k {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: .92rem;
  color: var(--ink-deep);
}

.page-about .site2025-list .v {
  font-size: .9rem;
  line-height: 1.6;
  color: var(--ink);
}

.page-about .map {
  display: flex;
  border: 1px solid var(--line);
  background: var(--paper-white);
  padding: 10px;
  aspect-ratio: 4 / 3;
}

.page-about .map-rail {
  width: 22%;
  max-width: 76px;
  background: var(--ink-deep);
  padding: 10px 8px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .map-brand {
  display: block;
  height: 7px;
  width: 62%;
  background: var(--blue-mist);
}

.page-about .map-tab {
  display: block;
  height: 4px;
  background: rgba(255, 255, 255, .3);
}

.page-about .map-tab.is-current {
  background: var(--red);
}

.page-about .map-stage {
  flex: 1;
  padding-left: 10px;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.page-about .map-bar {
  height: 9px;
  background: var(--blue-wash);
}

.page-about .map-card {
  height: 26%;
  background: var(--paper-warm);
  border: 1px solid var(--line);
}

.page-about .map-card.is-tall {
  flex: 1;
  background: var(--blue-wash);
}

@media (min-width: 880px) {
  .page-about .site2025-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .82fr);
    align-items: start;
  }

  .page-about .site2025-visual {
    position: sticky;
    top: calc(var(--bar-h) + 24px);
  }
}

/* 收尾 */
.page-about .about-cta {
  margin-top: clamp(40px, 6vw, 76px);
  background: var(--ink-deep);
  border: 1px solid var(--ink-deep);
  padding: clamp(26px, 4.4vw, 48px);
}

.page-about .cta-inner h2 {
  color: var(--paper-white);
  margin-top: 0;
}

.page-about .cta-inner p {
  color: var(--blue-wash);
  max-width: 48ch;
  margin-bottom: clamp(18px, 2.6vw, 26px);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .cta-actions .btn--line {
  border-color: var(--blue-mist);
  color: var(--paper-white);
}

.page-about .cta-actions .btn--quiet {
  color: var(--blue-wash);
}
<<<END>>>