.page-about {
  --about-gap: clamp(20px, 3.4vw, 48px);
  --about-pad-y: clamp(44px, 6.5vw, 92px);
  --about-ink-soft: var(--steel);
  background: var(--mist);
  color: var(--slate);
}

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

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: clamp(16px, 2.4vw, 26px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-about .breadcrumb a {
  color: var(--steel);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .breadcrumb a:hover {
  color: var(--ink);
  border-bottom-color: var(--maple);
}

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

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

/* 首屏 */
.page-about .about-hero {
  padding-bottom: var(--about-pad-y);
  border-bottom: var(--hair);
}

.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: start;
}

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

.page-about .eyebrow {
  display: block;
  color: var(--maple);
  font-size: 11px;
  letter-spacing: 0.16em;
}

.page-about .about-h1 {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-stretch: condensed;
  font-size: clamp(2.4rem, 6.6vw, 4.4rem);
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-lead__note {
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--maple);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft, var(--steel));
  max-width: 34ch;
}

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

.page-about .lede {
  margin: 0 0 clamp(24px, 3.4vw, 36px);
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--slate);
  max-width: 64ch;
}

.page-about .about-hero__figure,
.page-about .about-figure {
  margin: 0;
}

.page-about .media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.82) contrast(1.02);
}

.page-about .media__caption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--steel);
}

/* 通用章节 */
.page-about .about-sec {
  padding-block: var(--about-pad-y);
  border-bottom: var(--hair);
}

.page-about .about-sec--alt {
  background: var(--paper);
}

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

.page-about .about-h2 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-stretch: condensed;
  font-size: clamp(1.8rem, 3.6vw, 2.9rem);
  line-height: 1.04;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.page-about .about-rail__note {
  margin: 18px 0 0;
  max-width: 32ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--steel);
}

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

.page-about .prose p {
  margin: 0 0 1.2em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--slate);
  max-width: 66ch;
}

.page-about .prose p:last-child {
  margin-bottom: 0;
}

/* 引用块 */
.page-about .about-quote {
  margin: clamp(26px, 3.6vw, 40px) 0;
  padding: clamp(18px, 2.6vw, 26px) clamp(18px, 2.6vw, 30px);
  background: var(--paper);
  border-left: 3px solid var(--maple);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.15rem, 2.1vw, 1.55rem);
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-quote cite {
  display: block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--steel);
}

/* 时间线 */
.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--line);
}

.page-about .timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 0 0 clamp(26px, 3.4vw, 38px) 30px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 13px;
  height: 13px;
  border: 1px solid var(--steel);
  background: var(--mist);
  border-radius: 50%;
}

.page-about .about-sec--alt .timeline__item::before {
  background: var(--paper);
}

.page-about .timeline__item:last-child::before {
  border-color: var(--maple);
  background: var(--maple);
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--maple);
}

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

.page-about .timeline__title {
  margin: 4px 0 8px;
  font-family: var(--font-display);
  font-weight: 300;
  font-stretch: condensed;
  font-size: clamp(1.2rem, 2.2vw, 1.6rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .timeline__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel);
  max-width: 60ch;
}

.page-about .about-figure {
  margin-top: clamp(28px, 4vw, 44px);
  padding-top: clamp(20px, 2.6vw, 28px);
  border-top: var(--hair);
}

/* 团队折叠列表 */
.page-about .team {
  border-top: var(--hair);
}

.page-about .team__item {
  border-bottom: var(--hair);
}

.page-about .team__summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  color: var(--ink);
  transition: padding-left 200ms var(--ease);
}

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

.page-about .team__summary:hover {
  padding-left: 6px;
}

.page-about .team__summary:focus-visible {
  outline: 2px solid var(--maple);
  outline-offset: 2px;
}

.page-about .team__num {
  flex: none;
  width: 26px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--maple);
}

.page-about .team__name {
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-weight: 300;
  font-stretch: condensed;
  font-size: clamp(1.15rem, 2.1vw, 1.5rem);
  letter-spacing: -0.01em;
}

.page-about .team__plus {
  position: relative;
  flex: none;
  align-self: center;
  width: 14px;
  height: 14px;
}

.page-about .team__plus::before,
.page-about .team__plus::after {
  content: "";
  position: absolute;
  background: var(--steel);
  transition: transform 200ms var(--ease);
}

.page-about .team__plus::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 1px;
}

.page-about .team__plus::after {
  left: 6px;
  top: 0;
  width: 1px;
  height: 14px;
}

.page-about .team__item[open] .team__plus::after {
  transform: scaleY(0);
}

.page-about .team__body {
  padding: 0 0 20px 40px;
}

.page-about .team__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel);
  max-width: 62ch;
}

/* PCV4 */
.page-about .pcv4 {
  background: var(--slate);
  color: var(--mist);
  padding-block: var(--about-pad-y);
}

.page-about .pcv4__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 56px);
  align-items: center;
}

.page-about .pcv4__seal {
  min-width: 0;
}

.page-about .seal {
  display: block;
  width: clamp(112px, 20vw, 156px);
  height: auto;
  color: var(--mist);
  transition: transform 200ms var(--ease);
}

.page-about .pcv4__seal:hover .seal {
  transform: translate(2px, -2px);
}

.page-about .seal__t1 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 400;
  letter-spacing: 0.08em;
  fill: currentColor;
}

.page-about .seal__t2 {
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.18em;
  fill: currentColor;
  opacity: 0.85;
}

.page-about .pcv4__text {
  min-width: 0;
}

.page-about .pcv4__tag {
  display: inline-block;
  border-color: var(--maple);
  color: var(--mist);
  background: var(--maple);
}

.page-about .pcv4__title {
  margin: 16px 0 18px;
  font-family: var(--font-display);
  font-weight: 200;
  font-stretch: condensed;
  font-size: clamp(1.7rem, 3.4vw, 2.6rem);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--mist);
}

.page-about .pcv4__text p {
  margin: 0 0 1em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist-blue);
  max-width: 64ch;
}

.page-about .pcv4__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.6vw, 28px);
}

.page-about .pcv4__ghost {
  color: var(--mist);
  border-color: var(--mist-blue);
}

.page-about .pcv4__ghost:hover {
  border-color: var(--mist);
}

/* 数字 */
.page-about .figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-bottom: clamp(26px, 3.6vw, 40px);
  background: var(--line);
  border: var(--hair);
}

.page-about .figures__cell {
  background: var(--mist);
  padding: clamp(16px, 2.4vw, 26px);
  min-width: 0;
}

.page-about .figures__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 200;
  font-stretch: condensed;
  font-size: clamp(1.9rem, 4.4vw, 3rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .figures__num em {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--steel);
  margin-left: 3px;
}

.page-about .figures__label {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

/* 收束 */
.page-about .closing {
  background: var(--paper);
  padding-block: clamp(40px, 6vw, 76px);
  border-top: var(--hair);
}

.page-about .closing__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.4vw, 40px);
  align-items: end;
}

.page-about .closing__title {
  margin: 14px 0 12px;
  font-family: var(--font-display);
  font-weight: 200;
  font-stretch: condensed;
  font-size: clamp(1.6rem, 3.4vw, 2.6rem);
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--ink);
  max-width: 24ch;
}

.page-about .closing__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel);
  max-width: 52ch;
}

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

/* 断点 */
@media (min-width: 720px) {
  .page-about .figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .closing__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: 4fr 7fr;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--band-h) + 20px);
  }

  .page-about .timeline__item {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 24px;
    padding-left: 34px;
  }

  .page-about .pcv4__inner {
    grid-template-columns: 170px minmax(0, 1fr);
  }

  .page-about .team__body {
    padding-left: 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .seal,
  .page-about .team__summary,
  .page-about .team__plus::before,
  .page-about .team__plus::after,
  .page-about .breadcrumb a {
    transition: none;
  }

  .page-about .pcv4__seal:hover .seal,
  .page-about .team__summary:hover {
    transform: none;
    padding-left: 0;
  }
}
<<<END>>>

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