.page-about {
  --about-rail: 220px;
  background: var(--ink);
  color: var(--light);
  font-size: var(--fs-body);
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about .about-crumb {
  padding-top: 1.5rem;
}

.page-about .about-kicker {
  margin: 0 0 0.75rem;
  font-family: var(--mono);
  font-size: var(--fs-label);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-block-head {
  max-width: 44rem;
  margin-bottom: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-block-head h2 {
  margin: 0 0 0.85rem;
  font-size: var(--fs-h2);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: 0.01em;
}

.page-about .about-sub {
  margin: 0;
  color: var(--mist);
  font-size: var(--fs-small);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(1.5rem, 4vw, 3rem) 0 clamp(2.5rem, 6vw, 5rem);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3.5rem);
  align-items: end;
}

.page-about .about-hero h1 {
  margin: 0 0 1.15rem;
  font-size: var(--fs-h1);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: 0.01em;
}

.page-about .about-hero h1 em {
  font-style: normal;
  color: var(--orange);
}

.page-about .about-hero .lede {
  margin: 0 0 1.5rem;
  max-width: 34rem;
  color: var(--light);
  font-size: 1.0625rem;
  line-height: 1.8;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-hero-media {
  position: relative;
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: linear-gradient(150deg, var(--ink-2), var(--ink));
  border: 1px solid var(--line);
}

.page-about .about-hero-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-hero-tag {
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  padding: 0.4rem 0.9rem;
  border-radius: var(--r-pill);
  background: var(--gold);
  color: var(--charcoal);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
}

/* ---------- 品牌速写 ---------- */

.page-about .about-sketch {
  margin-top: clamp(2.25rem, 5vw, 3.75rem);
  padding-top: clamp(1.5rem, 3vw, 2.25rem);
  border-top: 1px solid var(--line);
}

.page-about .about-sketch-line {
  margin: 0 0 clamp(1.5rem, 3vw, 2.25rem);
  max-width: 46rem;
  font-size: clamp(1.125rem, 2.4vw, 1.5rem);
  font-weight: 600;
  line-height: 1.6;
  color: var(--light);
}

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

.page-about .figure-card {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1.4rem 1.35rem;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(165deg, var(--ink-2), var(--ink));
}

.page-about .figure-num {
  font-family: var(--mono);
  font-size: clamp(2rem, 6vw, 2.75rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .figure-label {
  font-size: var(--fs-small);
  font-weight: 700;
  color: var(--light);
}

.page-about .figure-note {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 发展脉络 ---------- */

.page-about .about-chron {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 3.25rem);
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), rgba(228, 178, 76, 0.12));
}

.page-about .about-node {
  position: relative;
  padding: 0 0 1.6rem 1.7rem;
}

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

.page-about .node-dot {
  position: absolute;
  left: 1px;
  top: 0.38rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(228, 178, 76, 0.14);
}

.page-about .node-year {
  display: block;
  margin-bottom: 0.3rem;
  font-family: var(--mono);
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .node-text {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-narrative {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-block h3 {
  margin: 0 0 0.7rem;
  font-size: var(--fs-h3);
  font-weight: 900;
  line-height: 1.3;
}

.page-about .about-block p {
  margin: 0;
  color: var(--light);
}

.page-about .about-chron-media {
  margin: 0;
}

.page-about .about-chron-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
}

.page-about .about-chron-media figcaption,
.page-about .about-matrix-media figcaption {
  margin-top: 0.7rem;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 三条主线（奶油反色段） ---------- */

.page-about .section--cream {
  background: var(--cream);
  color: var(--charcoal);
}

.page-about .section--cream .about-kicker {
  color: var(--brick);
}

.page-about .section--cream .about-sub,
.page-about .section--cream .about-team-copy p {
  color: rgba(15, 20, 24, 0.7);
}

.page-about .about-lines {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .line-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.75rem;
  padding: 1.5rem 1.4rem;
  border-radius: var(--r-md);
  border: 1px solid var(--line-dark);
  border-left: 4px solid var(--orange);
  background: rgba(255, 255, 255, 0.55);
}

.page-about .line-item:nth-child(2) {
  border-left-color: var(--gold);
}

.page-about .line-item:nth-child(3) {
  border-left-color: var(--celadon);
}

.page-about .line-index {
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--brick);
  font-variant-numeric: tabular-nums;
}

.page-about .line-name {
  margin: 0 0 0.5rem;
  font-size: 1.3125rem;
  font-weight: 900;
  color: var(--charcoal);
}

.page-about .line-body p {
  margin: 0 0 0.9rem;
  color: rgba(15, 20, 24, 0.76);
}

.page-about .line-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-about .line-points li {
  padding: 0.28rem 0.75rem;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-dark);
  font-size: 0.8125rem;
  color: rgba(15, 20, 24, 0.72);
}

/* ---------- 栏目分类矩阵 ---------- */

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

.page-about .matrix-cell {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding: 1.5rem 1.35rem;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, var(--ink-2), var(--ink));
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .matrix-cell:hover,
.page-about .matrix-cell:focus-within {
  transform: translateY(-4px);
  border-color: rgba(228, 178, 76, 0.5);
}

.page-about .matrix-index {
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .matrix-cell h3 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--light);
}

.page-about .matrix-cell p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .matrix-list {
  list-style: none;
  margin: 0;
  padding: 0.85rem 0 0;
  border-top: 1px dashed var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.35rem 0.75rem;
}

.page-about .matrix-list li {
  font-size: 0.8125rem;
  color: var(--light);
}

.page-about .about-matrix-media {
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
}

.page-about .about-matrix-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
}

/* ---------- 团队 ---------- */

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

.page-about .about-team-copy h2 {
  margin: 0 0 0.9rem;
  font-size: var(--fs-h2);
  font-weight: 900;
  line-height: 1.16;
  color: var(--charcoal);
}

.page-about .about-team-copy p {
  margin: 0 0 1rem;
}

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

.page-about .team-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
}

.page-about .team-stat {
  padding: 1.15rem 1rem;
  border-radius: var(--r-md);
  border: 1px solid var(--line-dark);
  background: rgba(255, 255, 255, 0.55);
}

.page-about .team-stat-num {
  display: block;
  font-family: var(--mono);
  font-size: 1.875rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.page-about .team-stat-label {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: rgba(15, 20, 24, 0.7);
}

/* ---------- 版本迭代 ---------- */

.page-about .version-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.85rem;
}

.page-about .version-card {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, var(--ink-2), var(--ink));
  overflow: hidden;
}

.page-about .version-card[open] {
  border-color: rgba(228, 178, 76, 0.45);
}

.page-about .version-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.15rem 1.3rem;
  cursor: pointer;
  list-style: none;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--light);
}

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

.page-about .version-caret {
  position: relative;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
}

.page-about .version-caret::before,
.page-about .version-caret::after {
  content: "";
  position: absolute;
  background: var(--orange);
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}

.page-about .version-caret::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 2px;
}

.page-about .version-caret::after {
  left: 7px;
  top: 0;
  width: 2px;
  height: 16px;
}

.page-about .version-card[open] .version-caret::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .version-body {
  padding: 0 1.3rem 1.35rem;
}

.page-about .version-body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 行动段 ---------- */

.page-about .about-cta-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 3vw, 2.5rem);
  padding: clamp(1.75rem, 4vw, 2.75rem);
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: linear-gradient(145deg, var(--ink-2), var(--ink));
}

.page-about .about-cta-copy h2 {
  margin: 0 0 0.85rem;
  font-size: var(--fs-h3);
  font-weight: 900;
  line-height: 1.24;
}

.page-about .about-cta-copy p {
  margin: 0;
  color: var(--mist);
  font-size: var(--fs-small);
}

.page-about .about-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-content: start;
}

.page-about .about-cta-links .btn {
  flex: 0 1 auto;
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .about-figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 760px) {
  .page-about .about-matrix {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .line-item {
    grid-template-columns: 72px minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.85fr);
    gap: clamp(2.5rem, 5vw, 4rem);
  }

  .page-about .about-chron {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(2.5rem, 5vw, 4.5rem);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 118px;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    gap: clamp(2.5rem, 5vw, 4rem);
  }

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

@media (min-width: 1100px) {
  .page-about .about-matrix-media img {
    aspect-ratio: 21 / 9;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .matrix-cell,
  .page-about .version-caret::before,
  .page-about .version-caret::after {
    transition: none;
  }

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