.page-about {
  --about-hair: rgba(16, 35, 63, 0.12);
  --about-hair-light: rgba(255, 247, 236, 0.22);
  background: var(--cream);
  color: var(--ink);
}

.page-about .breadcrumb {
  padding-top: 20px;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13px;
  color: var(--slate);
}

.page-about .breadcrumb__item a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--about-hair);
  padding-bottom: 1px;
}

.page-about .breadcrumb__item a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-about .breadcrumb__sep {
  color: var(--slate);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 28px;
  padding-top: clamp(28px, 5vw, 56px);
  padding-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-hero__copy {
  max-width: 44ch;
}

.page-about .about-hero .kicker {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 8vw, 76px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--ink);
  transform: rotate(-1.2deg);
  transform-origin: left center;
}

.page-about .about-hero .lede {
  margin: 0;
  font-size: clamp(15px, 2.4vw, 18px);
  line-height: 1.8;
  color: var(--ink);
  max-width: 40ch;
}

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

.page-about .about-chip {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 22px;
  border-radius: var(--radius);
  background: var(--paper);
  border: 1px solid var(--about-hair);
}

.page-about .about-chip--alt {
  background: var(--orange);
  border-color: transparent;
  color: var(--ink);
}

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

.page-about .about-chip--alt .about-chip__k {
  color: rgba(16, 35, 63, 0.72);
}

.page-about .about-chip__v {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 26px;
  line-height: 1;
  letter-spacing: -0.02em;
}

/* ---------- 年份跳转条 ---------- */
.page-about .about-jump {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding-top: 8px;
  padding-bottom: clamp(28px, 5vw, 48px);
}

.page-about .about-jump__label {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--slate);
}

.page-about .about-jump__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-jump__list a {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 999px;
  background: var(--paper);
  border: 1px solid var(--about-hair);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: background 200ms ease, color 200ms ease, transform 200ms ease;
}

.page-about .about-jump__list a:hover,
.page-about .about-jump__list a:focus-visible {
  background: var(--deep-teal);
  color: var(--cream);
  border-color: var(--deep-teal);
  transform: translateY(-2px);
}

/* ---------- 时间线 ---------- */
.page-about .about-line {
  padding-bottom: clamp(40px, 7vw, 88px);
}

.page-about .about-line__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: clamp(20px, 4vw, 36px);
}

.page-about .about-line .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 5vw, 44px);
  line-height: 1.1;
  letter-spacing: -0.01em;
}

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

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(32px, 6vw, 56px);
}

.page-about .tl-item {
  display: grid;
  gap: 14px;
  scroll-margin-top: 96px;
}

.page-about .tl-rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .tl-year {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(44px, 12vw, 72px);
  line-height: 0.86;
  letter-spacing: -0.05em;
  color: transparent;
  -webkit-text-stroke: 1.4px var(--deep-teal);
}

.page-about .tl-year--fill {
  color: var(--orange);
  -webkit-text-stroke: 0;
  font-size: clamp(32px, 9vw, 52px);
}

.page-about .tl-station {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--slate);
  transform: rotate(-4deg);
  white-space: nowrap;
}

.page-about .tl-body {
  display: grid;
  gap: 18px;
}

.page-about .tl-card {
  padding: clamp(20px, 4vw, 32px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-hair);
}

.page-about .tl-card .card__eyebrow {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--slate);
}

.page-about .tl-card .card__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 3.6vw, 28px);
  line-height: 1.25;
}

.page-about .tl-card .card__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--ink);
  max-width: 60ch;
}

.page-about .tl-card.card--white .card__text {
  color: var(--ink);
}

.page-about .tl-actions {
  margin-top: 18px;
}

.page-about .tl-actions .btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 200ms ease, background 200ms ease;
}

.page-about .tl-actions .btn--ink {
  background: var(--ink);
  color: var(--cream);
}

.page-about .tl-actions .btn--ink:hover,
.page-about .tl-actions .btn--ink:focus-visible {
  background: var(--deep-teal);
  transform: translateY(-2px);
}

/* details 折叠 */
.page-about .tl-more {
  margin-top: 16px;
  border-top: 1px dashed var(--about-hair);
  padding-top: 12px;
}

.page-about .tl-more summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--deep-teal);
  padding: 4px 0;
}

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

.page-about .tl-more summary::before {
  content: "＋";
  font-size: 13px;
  transition: transform 200ms ease;
}

.page-about .tl-more[open] summary::before {
  content: "－";
}

.page-about .tl-more summary:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
  border-radius: 4px;
}

.page-about .tl-more__body {
  padding-top: 10px;
}

.page-about .tl-more__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink);
  max-width: 60ch;
}

/* 图片 */
.page-about .about-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(135deg, var(--mist), var(--paper));
}

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

.page-about .about-figure--wide img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--4x3 img {
  aspect-ratio: 4 / 3;
}

.page-about .about-figure--culture img {
  aspect-ratio: 3 / 2;
}

.page-about .media__caption {
  display: block;
  padding: 10px 16px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--slate);
  background: var(--white);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  position: relative;
  padding-top: clamp(48px, 8vw, 96px);
  padding-bottom: clamp(48px, 8vw, 96px);
  overflow: hidden;
}

.page-about .about-team .wrap {
  position: relative;
}

.page-about .about-cloud {
  position: absolute;
  top: -28px;
  left: -20px;
  width: 460px;
  max-width: 90%;
  color: var(--cream-16);
  pointer-events: none;
}

.page-about .about-team__kicker {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--sand);
}

.page-about .about-team .section-title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 5.4vw, 48px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--cream);
  max-width: 20ch;
}

.page-about .about-team__lede {
  margin: 0 0 clamp(24px, 4vw, 40px);
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--cream-70);
  max-width: 52ch;
}

.page-about .team-blocks {
  display: grid;
  gap: 14px;
}

.page-about .team-block {
  padding: 22px 22px 24px;
  border-radius: var(--radius-lg);
  background: rgba(255, 247, 236, 0.08);
  border: 1px solid var(--about-hair-light);
  transition: background 220ms ease, transform 220ms ease;
}

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

.page-about .team-block__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 8vw, 54px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--sand);
}

.page-about .team-block--tech .team-block__num {
  color: var(--teal);
}

.page-about .team-block--ops .team-block__num {
  color: var(--orange);
}

.page-about .team-block__title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  color: var(--cream);
}

.page-about .team-block__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--cream-85);
}

.page-about .team-block__more {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 260ms ease, opacity 220ms ease;
}

.page-about .team-block__more p {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--about-hair-light);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--cream-70);
}

.page-about .team-foot {
  display: grid;
  gap: 10px;
  margin-top: clamp(22px, 4vw, 34px);
  padding-top: 18px;
  border-top: 1px solid var(--about-hair-light);
}

.page-about .team-foot__item {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--cream-70);
}

.page-about .team-foot__item .mono {
  display: inline-block;
  margin-right: 8px;
  color: var(--sand);
  font-size: 12.5px;
  letter-spacing: 0.06em;
}

/* ---------- 覆盖 ---------- */
.page-about .about-reach {
  padding-top: clamp(44px, 7vw, 84px);
  padding-bottom: clamp(44px, 7vw, 84px);
}

.page-about .about-reach__head {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(22px, 4vw, 38px);
}

.page-about .about-reach .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 5.4vw, 46px);
  line-height: 1.12;
  letter-spacing: -0.01em;
}

.page-about .about-reach__note {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--slate);
}

.page-about .reach-grid {
  display: grid;
  gap: 12px;
}

.page-about .reach-stat {
  padding: 20px 22px;
  border-radius: var(--radius);
  background: var(--paper);
  border: 1px solid var(--about-hair);
}

.page-about .reach-stat .stat__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6vw, 40px);
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.page-about .reach-stat .stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--slate);
}

.page-about .reach-stat--lead {
  background: var(--orange);
  border-color: transparent;
}

.page-about .reach-stat--lead .stat__label {
  color: rgba(16, 35, 63, 0.78);
}

.page-about .reach-stat--wide {
  background: var(--white);
}

.page-about .reach-stat__text {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--slate);
}

.page-about .about-reach__honor {
  display: inline-block;
  margin: clamp(20px, 4vw, 32px) 0 0;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--mist);
  color: var(--deep-teal);
  font-size: 13.5px;
  line-height: 1.6;
}

/* ---------- 区域文化 ---------- */
.page-about .about-culture {
  padding-top: clamp(44px, 7vw, 84px);
  padding-bottom: clamp(44px, 7vw, 84px);
}

.page-about .about-culture__inner {
  display: grid;
  gap: 26px;
}

.page-about .about-culture .kicker {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--teal);
}

.page-about .about-culture .section-title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 5.4vw, 46px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-culture .prose {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .culture-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .culture-list li {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.72);
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .culture-list .mono {
  display: inline-block;
  min-width: 6.6em;
  margin-right: 6px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--deep-teal);
}

.page-about .about-culture__meta {
  margin: 18px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 下一段 ---------- */
.page-about .about-next {
  padding-top: clamp(40px, 7vw, 80px);
  padding-bottom: clamp(44px, 7vw, 88px);
}

.page-about .about-next .section-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 6vw, 52px);
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.page-about .about-next__lede {
  margin: 0 0 clamp(22px, 4vw, 34px);
  max-width: 50ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--slate);
}

.page-about .next-links {
  display: grid;
  gap: 12px;
}

.page-about .next-link {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 6px 16px;
  padding: 20px 22px;
  border-radius: var(--radius);
  background: var(--paper);
  border: 1px solid transparent;
  color: var(--ink);
  text-decoration: none;
  transition: background 220ms ease, border-color 220ms ease, transform 220ms ease;
}

.page-about .next-link--plain {
  background: transparent;
  border-color: var(--about-hair);
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  background: var(--orange);
  border-color: var(--orange);
  transform: translateX(4px);
}

.page-about .next-link__k {
  grid-column: 1;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--slate);
}

.page-about .next-link:hover .next-link__k,
.page-about .next-link:focus-visible .next-link__k {
  color: rgba(16, 35, 63, 0.75);
}

.page-about .next-link__t {
  grid-column: 1;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .next-link__arrow {
  grid-column: 2;
  grid-row: 1 / span 2;
  font-size: 22px;
  color: var(--ink);
  transition: transform 220ms ease;
}

.page-about .next-link:hover .next-link__arrow,
.page-about .next-link:focus-visible .next-link__arrow {
  transform: translateX(4px);
}

/* ---------- 桌面增强 ---------- */
@media (min-width: 720px) {
  .page-about .reach-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .reach-stat--lead {
    grid-column: span 2;
    grid-row: span 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .page-about .reach-stat--wide {
    grid-column: span 2;
  }

  .page-about .team-blocks {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .team-block:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .team-block:nth-child(3) {
    margin-top: 12px;
  }

  .page-about .team-foot {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }

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

  .page-about .about-culture__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
    align-items: start;
    gap: clamp(24px, 4vw, 48px);
  }

  .page-about .about-culture__copy {
    order: 2;
  }

  .page-about .about-figure--culture {
    order: 1;
    position: sticky;
    top: 96px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1fr) 160px;
    align-items: end;
    gap: 40px;
    padding-top: clamp(40px, 5vw, 72px);
  }

  .page-about .about-hero__aside {
    flex-direction: column;
    align-items: stretch;
    padding-bottom: 6px;
  }

  .page-about .timeline {
    gap: 0;
  }

  .page-about .tl-item {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
    padding: clamp(24px, 3.4vw, 44px) 0;
    border-top: 1px solid var(--about-hair);
  }

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

  .page-about .tl-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .tl-year {
    font-size: clamp(64px, 7.4vw, 108px);
  }

  .page-about .tl-year--fill {
    font-size: clamp(44px, 4.6vw, 66px);
  }

  .page-about .tl-station {
    transform: rotate(-3deg);
    transform-origin: left center;
  }

  .page-about .tl-item--wide .tl-body {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
    gap: 24px;
  }

  .page-about .tl-item:not(.tl-item--wide) .tl-card {
    max-width: 620px;
  }

  .page-about .tl-item:nth-child(3) .tl-card,
  .page-about .tl-item:nth-child(4) .tl-card {
    max-width: 580px;
  }

  .page-about .reach-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .reach-stat--lead {
    grid-column: span 2;
    grid-row: span 2;
  }

  .page-about .reach-stat--wide {
    grid-column: span 2;
  }
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .team-block:hover {
    background: rgba(255, 247, 236, 0.16);
    transform: translateY(-4px);
  }

  .page-about .team-block:hover .team-block__more,
  .page-about .team-block:focus-within .team-block__more {
    max-height: 14em;
    opacity: 1;
  }
}

@media (max-width: 899px) {
  .page-about .team-block__more {
    max-height: none;
    overflow: visible;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero h1 {
    transform: none;
  }

  .page-about .about-jump__list a,
  .page-about .team-block,
  .page-about .next-link,
  .page-about .next-link__arrow,
  .page-about .tl-actions .btn {
    transition: none;
  }

  .page-about .next-link:hover,
  .page-about .next-link:focus-visible,
  .page-about .team-block:hover,
  .page-about .about-jump__list a:hover {
    transform: none;
  }
}
<<<END>>>