.page-about {
  --about-rail-w: 96px;
  --about-card-shadow: 7px 7px 0 var(--ink);
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.5rem, 4vw, 2.5rem) clamp(2.5rem, 6vw, 4rem);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -8%;
  top: 18%;
  width: min(46%, 380px);
  height: 14px;
  background: var(--tu);
  opacity: 0.4;
  transform: skewX(-24deg);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

.page-about .about-hero__body .display {
  max-width: 16ch;
  margin-top: 0.5rem;
  line-height: 0.98;
}

.page-about .about-hero__body .lead {
  max-width: 46ch;
  margin-top: 1rem;
}

.page-about .about-stats {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 1.25rem 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 0.75rem;
  border-top: var(--border) solid var(--ink);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4.2vw, 2.3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--tu);
  letter-spacing: -0.02em;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 0.4rem;
  font-size: var(--fs-sm);
  color: var(--char);
  line-height: 1.5;
}

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

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

/* 沿革：年份轨道 + 折线错位档案卡 */
.page-about .about-history__lead {
  max-width: 48ch;
  margin-top: 0.75rem;
  color: var(--char);
}

.page-about .about-timeline {
  display: grid;
  gap: 1.5rem;
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-rail {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  position: relative;
}

.page-about .about-rail__year {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 700;
  padding: 0.35rem 0.65rem;
  border: 2px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  text-decoration: none;
  transition: background 160ms var(--ease), color 160ms var(--ease);
}

.page-about .about-rail__year:hover,
.page-about .about-rail__year:focus-visible {
  background: var(--neon);
  color: var(--ink);
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.page-about .about-rail__line {
  display: none;
}

.page-about .about-track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
}

.page-about .archive-card {
  position: relative;
  border: var(--border) solid var(--ink);
  background: var(--mist);
  box-shadow: var(--about-card-shadow);
  padding: clamp(1.1rem, 3vw, 1.75rem);
}

.page-about .archive-card__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--tu);
  letter-spacing: -0.03em;
}

.page-about .archive-card__title {
  margin: 0.6rem 0 0.5rem;
  font-size: var(--fs-md);
  font-weight: 900;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .archive-card p {
  margin: 0;
  color: var(--char);
  line-height: 1.75;
}

/* 内容方法 */
.page-about .about-method__head .headline,
.page-about .about-method .headline,
.page-about .about-motif .headline {
  color: var(--mist);
}

.page-about .about-method__lead {
  max-width: 50ch;
  margin-top: 0.75rem;
  color: var(--tint);
  line-height: 1.75;
}

.page-about .method-folds {
  display: grid;
  gap: 0.85rem;
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .method-fold {
  border: 2px solid var(--neon);
  background: rgba(57, 244, 228, 0.06);
  padding: 0.9rem 1rem;
}

.page-about .method-fold__summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--neon);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.page-about .method-fold__summary::before {
  content: "＋";
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--yellow);
}

.page-about .method-fold[open] .method-fold__summary::before {
  content: "－";
}

.page-about .method-fold__body {
  margin: 0.7rem 0 0;
  color: var(--paper);
  line-height: 1.75;
}

.page-about .about-method__lines {
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
  align-items: stretch;
}

.page-about .method-line {
  border-color: var(--paper);
  padding: 1.1rem;
}

.page-about .method-line .tag {
  display: inline-block;
  margin-bottom: 0.6rem;
}

.page-about .method-line .card__title {
  color: var(--mist);
  font-size: var(--fs-base);
  margin-bottom: 0.4rem;
}

.page-about .method-line p:last-child {
  color: var(--tint);
  line-height: 1.7;
  margin: 0;
}

/* 三地团队 */
.page-about .about-team__layout {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

.page-about .team-grid {
  display: grid;
  gap: 1.1rem;
}

.page-about .team-card {
  border: var(--border) solid var(--ink);
  background: var(--mist);
  box-shadow: var(--about-card-shadow);
  padding: 1.15rem;
}

.page-about .team-card__city {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--fs-sm);
  padding: 0.2rem 0.5rem;
  background: var(--lake);
  color: var(--mist);
}

.page-about .team-card__role {
  margin: 0.65rem 0 0.45rem;
  font-size: var(--fs-base);
  font-weight: 900;
  color: var(--ink);
}

.page-about .team-card p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--char);
}

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

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

/* 合作生态 */
.page-about .about-eco__lead {
  max-width: 52ch;
  margin-top: 0.75rem;
  color: var(--char);
  line-height: 1.75;
}

.page-about .eco-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.page-about .eco-tags .tag {
  cursor: pointer;
  border: 2px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  font: inherit;
  font-size: var(--fs-sm);
  font-weight: 700;
  padding: 0.35rem 0.75rem;
  transition: background 160ms var(--ease), color 160ms var(--ease);
}

.page-about .eco-tags .tag:hover,
.page-about .eco-tags .tag:focus-visible {
  background: var(--neon);
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.page-about .eco-tags .tag[aria-pressed="true"] {
  background: var(--ink);
  color: var(--mist);
  border-color: var(--ink);
}

.page-about .eco-grid {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .eco-item {
  border: var(--border) solid var(--ink);
  background: var(--tint);
  padding: 1.15rem;
  box-shadow: 8px 8px 0 var(--tu);
}

.page-about .eco-item--league {
  box-shadow: 8px 8px 0 var(--lake);
}

.page-about .eco-item--gear {
  box-shadow: 8px 8px 0 var(--yellow);
}

.page-about .eco-item--campus {
  box-shadow: 8px 8px 0 var(--green);
}

.page-about .eco-item__title {
  margin: 0 0 0.45rem;
  font-size: var(--fs-base);
  font-weight: 900;
  color: var(--ink);
}

.page-about .eco-item p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--char);
}

.page-about .eco-honor {
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
  border-left: 8px solid var(--tu);
  background: var(--mist);
  padding: 1.1rem 1.25rem;
}

.page-about .eco-honor__label {
  margin: 0 0 0.4rem;
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--tu);
  text-transform: uppercase;
}

.page-about .eco-honor__text {
  margin: 0;
  max-width: 58ch;
  color: var(--char);
  line-height: 1.8;
}

/* 视觉母题 */
.page-about .about-motif__lead {
  max-width: 50ch;
  margin-top: 0.75rem;
  color: var(--tint);
  line-height: 1.75;
}

.page-about .motif-swatches {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.page-about .swatch {
  border: 2px solid var(--mist);
  background: rgba(255, 249, 238, 0.06);
  padding: 0.5rem;
}

.page-about .swatch__chip {
  display: block;
  height: 46px;
  margin-bottom: 0.5rem;
}

.page-about .swatch__chip--tu { background: var(--tu); }
.page-about .swatch__chip--lake { background: var(--lake); }
.page-about .swatch__chip--yellow { background: var(--yellow); }
.page-about .swatch__chip--green { background: var(--green); }

.page-about .swatch__name {
  display: block;
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--mist);
}

.page-about .swatch__use {
  display: block;
  margin-top: 0.15rem;
  font-size: var(--fs-xs);
  color: var(--tint);
}

.page-about .about-motif__media {
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
}

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

.page-about .about-motif__service {
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
  display: grid;
  gap: 0.6rem;
  border-top: 2px dashed rgba(242, 232, 214, 0.4);
  padding-top: 1.25rem;
}

.page-about .about-motif__num {
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 6vw, 3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
  margin: 0;
}

.page-about .about-motif__service-text {
  margin: 0;
  max-width: 62ch;
  color: var(--paper);
  line-height: 1.8;
}

.page-about .about-motif__service-text a {
  color: var(--yellow);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 下一步 */
.page-about .about-next {
  background: var(--tu);
  color: var(--mist);
  padding-block: clamp(2.25rem, 6vw, 3.5rem);
}

.page-about .about-next__inner {
  display: grid;
  gap: 1.5rem;
}

.page-about .about-next .eyebrow--light {
  color: var(--mist);
  opacity: 0.85;
}

.page-about .about-next .headline {
  color: var(--mist);
  margin-top: 0.4rem;
}

.page-about .about-next__lead {
  margin: 0.6rem 0 0;
  max-width: 42ch;
  color: var(--paper);
  line-height: 1.75;
}

.page-about .about-next__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.page-about .about-next__links .btn {
  display: block;
  width: 100%;
  text-align: center;
}

/* 响应式 */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .motif-swatches {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(2rem, 5vw, 3.5rem);
  }

  .page-about .about-timeline {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(1.75rem, 4vw, 3rem);
  }

  .page-about .about-rail {
    flex-direction: column;
    align-items: flex-start;
    position: sticky;
    top: 110px;
    overflow: visible;
    padding-bottom: 0;
    gap: 0.6rem;
  }

  .page-about .about-rail__line {
    display: block;
    position: absolute;
    left: 12px;
    top: 8px;
    bottom: 8px;
    width: 3px;
    background: linear-gradient(180deg, var(--tu), var(--lake) 55%, var(--green));
    z-index: -1;
  }

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

  .page-about .archive-card:nth-child(even) {
    margin-left: clamp(1.5rem, 5vw, 4rem);
  }

  .page-about .archive-card:nth-child(odd) {
    margin-right: clamp(1rem, 4vw, 3rem);
  }

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

  .page-about .team-card:nth-child(2) {
    margin-top: 1.75rem;
  }

  .page-about .team-card:nth-child(3) {
    margin-top: 0.75rem;
  }

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

  .page-about .eco-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 1.5rem;
  }

  .page-about .about-motif__service {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    column-gap: 2rem;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: center;
    gap: 2.5rem;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__year,
  .page-about .eco-tags .tag {
    transition: none;
  }
}
<<<END>>>