.page-about {
  --about-line: rgba(23, 18, 15, .14);
  --about-line-light: rgba(245, 237, 227, .2);
  --about-panel: rgba(23, 18, 15, .045);
  background: var(--paper);
  color: var(--ink);
  overflow-x: clip;
}

.page-about .breadcrumb {
  padding-top: clamp(16px, 3vw, 26px);
}

.page-about .about-hero {
  padding: clamp(10px, 2vw, 18px) 0 clamp(36px, 6vw, 64px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 36px);
  align-items: end;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -.02em;
  margin: 0;
}

.page-about h1 {
  font-size: clamp(30px, 7vw, 56px);
  line-height: 1.1;
  margin: 12px 0 16px;
  max-width: 15em;
}

.page-about h2 {
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.2;
}

.page-about h3 {
  font-size: clamp(18px, 2.4vw, 22px);
  line-height: 1.35;
}

.page-about p {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  margin: 0;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--red);
  margin: 0;
}

.page-about .about-hero__lead {
  color: var(--muted);
  font-size: clamp(16px, 2.3vw, 18px);
  max-width: 34em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .about-hero__media {
  margin: 0;
  position: relative;
  background: var(--red-deep);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: clamp(48px, 12vw, 96px);
  height: 6px;
  background: var(--gold);
}

.page-about .media-frame__caption {
  display: block;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  padding: 10px 0 0;
}

/* ---------- 时间轴 ---------- */

.page-about .about-track {
  padding: clamp(36px, 6vw, 72px) 0 clamp(32px, 5vw, 56px);
  background: linear-gradient(180deg, rgba(179, 23, 43, .05), rgba(179, 23, 43, 0) 45%);
  border-top: 1px solid var(--about-line);
}

.page-about .about-track__head {
  max-width: 46em;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-track__head h2 {
  margin: 10px 0 12px;
}

.page-about .about-track__head .about-track__sub {
  color: var(--muted);
  font-size: 15px;
}

.page-about .about-track__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 3vw, 24px);
}

.page-about .rail {
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .rail__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
}

.page-about .rail__item {
  flex: 0 0 auto;
}

.page-about .rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  text-decoration: none;
  color: var(--muted);
  border: 1px solid var(--about-line);
  border-left: 3px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .rail__link:hover,
.page-about .rail__link:focus-visible {
  color: var(--red);
  border-left-color: var(--gold);
  background: rgba(224, 163, 46, .12);
}

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

.page-about .rail__year {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .rail__label {
  font-size: 13px;
  white-space: nowrap;
}

.page-about .node {
  position: relative;
  padding: clamp(18px, 3vw, 26px) 0 clamp(24px, 3.5vw, 36px);
  border-top: 1px solid var(--about-line);
  scroll-margin-top: 130px;
  transition: background 220ms var(--ease);
}

.page-about .node:first-child {
  border-top: 0;
}

.page-about .node:hover,
.page-about .node:focus-within,
.page-about .node:target {
  background: linear-gradient(90deg, rgba(224, 163, 46, .18), rgba(224, 163, 46, 0) 72%);
}

.page-about .node__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  background: var(--gold);
  padding: 4px 20px 4px 12px;
  margin-bottom: 12px;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

.page-about .node h3 {
  margin-bottom: 10px;
}

.page-about .node p {
  color: var(--muted);
  max-width: 44em;
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  background: var(--green);
  color: var(--paper);
  padding: clamp(40px, 6vw, 76px) 0;
}

.page-about .about-team__head {
  max-width: 44em;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-team .eyebrow {
  color: var(--gold-soft);
}

.page-about .about-team__head h2 {
  color: var(--paper);
  margin: 10px 0 12px;
}

.page-about .about-team__sub {
  color: rgba(245, 237, 227, .74);
  font-size: 15px;
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
}

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

.page-about .team-card {
  padding: 18px 20px 20px;
  background: rgba(245, 237, 227, .05);
  border: 1px solid var(--about-line-light);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
  transition: background 180ms var(--ease), transform 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  background: rgba(245, 237, 227, .1);
  border-color: var(--gold);
  transform: translateY(-4px);
}

.page-about .team-card__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--gold);
  letter-spacing: .08em;
}

.page-about .team-card h3 {
  color: var(--paper);
  margin: 6px 0 8px;
}

.page-about .team-card p {
  color: rgba(245, 237, 227, .76);
  font-size: 15px;
}

.page-about .team-card__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 12px 0 0;
  border-top: 1px dashed var(--about-line-light);
  display: grid;
  gap: 7px;
}

.page-about .team-card__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.65;
  color: rgba(245, 237, 227, .8);
  transition: color 160ms var(--ease);
}

.page-about .team-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 6px;
  height: 6px;
  background: var(--gold);
}

.page-about .team-card:hover .team-card__list li,
.page-about .team-card:focus-within .team-card__list li {
  color: var(--paper);
}

.page-about .about-team__side {
  display: grid;
  gap: clamp(18px, 3vw, 24px);
  align-content: start;
}

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

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-team .media-frame__caption {
  color: rgba(245, 237, 227, .62);
}

.page-about .steps {
  list-style: none;
  counter-reset: step;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .steps li {
  counter-increment: step;
  position: relative;
  padding-left: 40px;
  font-size: 14px;
  line-height: 1.65;
  color: rgba(245, 237, 227, .78);
}

.page-about .steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--gold);
}

.page-about .steps li::after {
  content: "";
  position: absolute;
  left: 13px;
  top: 22px;
  bottom: -10px;
  width: 1px;
  background: var(--about-line-light);
}

.page-about .steps li:last-child::after {
  display: none;
}

/* ---------- 栏目与专题 ---------- */

.page-about .about-shelf {
  padding: clamp(40px, 6vw, 76px) 0;
}

.page-about .about-shelf__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
}

.page-about .about-shelf__text h2 {
  margin: 10px 0 14px;
  max-width: 18em;
}

.page-about .about-shelf__text p {
  color: var(--muted);
  margin-bottom: 14px;
  max-width: 40em;
}

.page-about .series {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .series__item {
  padding-top: 10px;
  border-top: 2px solid var(--red);
}

.page-about .series__item:nth-child(2) {
  border-top-color: var(--gold);
}

.page-about .series__item:nth-child(3) {
  border-top-color: var(--blue);
}

.page-about .series__item:nth-child(4) {
  border-top-color: var(--green);
}

.page-about .series__item h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.page-about .series__item p {
  font-size: 14px;
  color: var(--muted);
  margin: 0;
}

.page-about .shelf-figure {
  margin: 0;
  align-self: start;
}

.page-about .shelf-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 节奏 ---------- */

.page-about .about-cadence {
  padding: clamp(36px, 5vw, 64px) 0 clamp(40px, 6vw, 72px);
  background: var(--about-panel);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-cadence__head {
  max-width: 42em;
  margin-bottom: clamp(22px, 3.5vw, 34px);
}

.page-about .about-cadence__head h2 {
  margin: 10px 0 12px;
}

.page-about .about-cadence__head p {
  color: var(--muted);
  font-size: 15px;
}

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

.page-about .cadence__cell {
  padding: 18px 18px 20px;
  background: var(--paper);
  border-top: 3px solid var(--red);
}

.page-about .cadence__cell--gold {
  border-top-color: var(--gold);
}

.page-about .cadence__cell--green {
  border-top-color: var(--green);
}

.page-about .cadence__cell--blue {
  border-top-color: var(--blue);
}

.page-about .cadence__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ink);
  margin-bottom: 10px;
}

.page-about .cadence__cell h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.page-about .cadence__cell p {
  font-size: 14px;
  color: var(--muted);
}

/* ---------- 颜色 ---------- */

.page-about .about-look {
  padding: clamp(40px, 6vw, 76px) 0;
}

.page-about .about-look__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 44px);
}

.page-about .about-look__text h2 {
  margin: 10px 0 14px;
  max-width: 18em;
}

.page-about .about-look__text p {
  color: var(--muted);
  margin-bottom: 14px;
  max-width: 40em;
}

.page-about .palette {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  align-content: start;
}

.page-about .palette__swatch {
  display: block;
  height: 76px;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

.page-about .palette__swatch--red {
  background: var(--red);
}

.page-about .palette__swatch--gold {
  background: var(--gold);
}

.page-about .palette__swatch--green {
  background: var(--green);
}

.page-about .palette__item h3 {
  font-size: 16px;
  margin: 10px 0 6px;
}

.page-about .palette__item p {
  font-size: 14px;
  color: var(--muted);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  background: var(--red);
  color: var(--paper);
  padding: clamp(32px, 5vw, 56px) 0;
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  align-items: center;
}

.page-about .about-cta h2 {
  color: var(--paper);
  margin-bottom: 10px;
}

.page-about .about-cta p {
  color: rgba(245, 237, 227, .82);
  font-size: 15px;
  max-width: 34em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}

.page-about .about-cta__link {
  color: var(--gold-soft);
  font-size: 15px;
  text-decoration: none;
  border-bottom: 1px solid var(--gold-soft);
  padding-bottom: 2px;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  color: var(--paper);
  border-color: var(--paper);
}

.page-about .about-cta__link:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .series {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.02fr .98fr;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-hero__text {
    padding-bottom: 8px;
  }

  .page-about .about-track__grid {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 60px);
  }

  .page-about .rail {
    position: sticky;
    top: 104px;
    align-self: start;
    overflow: visible;
    border-left: 1px solid var(--about-line);
  }

  .page-about .rail__list {
    display: block;
    padding: 0;
  }

  .page-about .rail__item + .rail__item {
    margin-top: 6px;
  }

  .page-about .rail__link {
    width: 100%;
    border: 0;
    border-left: 3px solid transparent;
    margin-left: -1px;
    background: transparent;
  }

  .page-about .about-team__grid {
    grid-template-columns: 1.1fr .9fr;
    gap: clamp(28px, 4vw, 52px);
  }

  .page-about .about-shelf__grid {
    grid-template-columns: 1.08fr .92fr;
    align-items: start;
  }

  .page-about .shelf-figure {
    margin-top: 32px;
  }

  .page-about .about-look__grid {
    grid-template-columns: 1.05fr .95fr;
    align-items: start;
  }

  .page-about .about-cta__inner {
    grid-template-columns: 1fr auto;
    gap: 32px;
  }
}

@media (min-width: 1080px) {
  .page-about .cadence {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-look__grid {
    grid-template-columns: 1.15fr .85fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .rail__link,
  .page-about .node,
  .page-about .team-card__list li {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .team-card:focus-within {
    transform: none;
  }
}
<<<END>>>