.page-about {
  --about-rail: 210px;
  --about-gap: 42px;
  background-color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 26px 0 0;
  background-image: linear-gradient(118deg, rgba(60, 110, 91, 0.07), transparent 58%);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 22px;
}

.page-about .about-title {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(28px, 7.4vw, var(--fs-3xl));
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 15em;
}

.page-about .about-lead {
  margin: 18px 0 0;
  max-width: 44em;
  font-size: var(--fs-base);
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
  margin: 28px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-meta li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: var(--fs-sm);
  color: var(--slate);
}

.page-about .about-meta .num {
  font-size: var(--fs-md);
  font-weight: 600;
  color: var(--zhu-deep);
}

.page-about .about-banner {
  margin: 30px 0 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--slate-seat);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-banner .media-caption {
  padding: 12px 16px;
  font-size: var(--fs-xs);
  color: var(--slate);
  background: var(--slate-seat);
}

/* ---------- 主体栅格 + 索引边栏 ---------- */
.page-about .about-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0 var(--about-gap);
  padding-top: 6px;
}

.page-about .about-rail {
  order: -1;
  position: static;
  display: block;
  margin: 0 0 6px;
  padding: 14px 0 16px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: transparent;
  overflow-x: auto;
}

.page-about .about-rail-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  color: var(--slate);
}

.page-about .about-rail nav {
  display: flex;
  gap: 8px;
}

.page-about .about-rail a {
  flex: 0 0 auto;
  display: block;
  padding: 6px 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-size: var(--fs-sm);
  color: var(--slate);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-rail a:hover,
.page-about .about-rail a:focus-visible {
  color: var(--zhu-deep);
  border-color: var(--zhu);
}

.page-about .about-rail a[aria-current="true"] {
  color: var(--paper);
  background: var(--zhu);
  border-color: var(--zhu);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: 42px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 26px;
}

.page-about .section-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 20px;
}

.page-about .section-no {
  flex: 0 0 auto;
  padding: 3px 9px;
  border-radius: 6px;
  background: var(--zhu-wash);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-variant-numeric: tabular-nums;
  color: var(--zhu);
}

.page-about .h-section {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(21px, 5.2vw, var(--fs-xl));
  line-height: 1.32;
  color: var(--ink);
}

.page-about .section-lede {
  margin: -6px 0 22px;
  font-size: var(--fs-sm);
  color: var(--slate);
  line-height: 1.75;
}

.page-about .about-prose p {
  margin: 0 0 1.05em;
  max-width: 40em;
  font-size: var(--fs-base);
  line-height: 1.85;
  color: var(--ink-soft);
}

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

.page-about .about-quote {
  margin: 26px 0;
  padding: 4px 0 4px 20px;
  border-left: 3px solid var(--bamboo);
  font-family: var(--font-serif);
  font-size: clamp(19px, 4.6vw, var(--fs-lg));
  line-height: 1.55;
  color: var(--ink);
}

/* ---------- 做事方法 ---------- */
.page-about .method-row {
  display: grid;
  gap: 20px;
  padding: 26px 0;
  border-top: 1px dashed var(--line-strong);
}

.page-about .method-row:first-of-type {
  border-top: 0;
  padding-top: 4px;
}

.page-about .method-title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(17px, 4.2vw, var(--fs-md));
  line-height: 1.45;
  color: var(--ink);
}

.page-about .method-text p {
  margin: 0;
  font-size: var(--fs-base);
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .method-fig {
  padding: 18px;
  border: 1px solid rgba(60, 110, 91, 0.24);
  border-radius: var(--radius-card);
  background: var(--bamboo-mist);
}

.page-about .fig-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.1em;
  color: var(--bamboo);
}

.page-about .fig-rows {
  display: grid;
  gap: 8px;
}

.page-about .fig-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 12px;
  border-radius: 10px;
  background: var(--paper);
  font-size: var(--fs-sm);
  color: var(--ink-soft);
}

.page-about .fig-row .num {
  color: var(--zhu);
  font-weight: 600;
}

.page-about .fig-seq {
  display: grid;
  gap: 8px;
}

.page-about .fig-seq-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 12px;
  border-radius: 10px;
  background: var(--paper);
  font-size: var(--fs-sm);
  color: var(--ink-soft);
}

.page-about .fig-seq-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: var(--zhu);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
}

/* ---------- 时间线 ---------- */
.page-about .tl-figure {
  margin: 0 0 24px;
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--slate-seat);
}

.page-about .tl-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 4;
  object-fit: cover;
}

.page-about .tl-figure .media-caption {
  padding: 12px 16px;
  font-size: var(--fs-xs);
  color: var(--slate);
  background: var(--slate-seat);
}

.page-about .tl-track {
  display: flex;
  gap: 14px;
  padding: 4px 2px 16px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .tl-track:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 4px;
  border-radius: 8px;
}

.page-about .tl-node {
  position: relative;
  flex: 0 0 min(78vw, 258px);
  scroll-snap-align: start;
  padding: 20px 18px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--paper);
  box-shadow: var(--shadow-sm);
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 18px;
  width: 28px;
  height: 3px;
  border-radius: 2px;
  background: var(--gold);
}

.page-about .tl-year {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-xl);
  letter-spacing: -0.02em;
  color: var(--zhu);
}

.page-about .tl-title {
  margin: 6px 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: var(--fs-base);
  color: var(--ink);
}

.page-about .tl-text {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.72;
  color: var(--ink-soft);
}

.page-about .tl-hint {
  margin: 4px 0 0;
  font-size: var(--fs-xs);
  letter-spacing: 0.04em;
  color: var(--slate);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 24px;
}

.page-about .team-text p {
  margin: 0 0 1em;
  font-size: var(--fs-base);
  line-height: 1.82;
  color: var(--ink-soft);
}

.page-about .role-list {
  display: grid;
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .role-list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-size: var(--fs-sm);
  color: var(--ink-soft);
}

.page-about .role-no {
  color: var(--bamboo);
  font-weight: 600;
}

.page-about .team-figure {
  margin: 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--slate-seat);
}

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

.page-about .team-figure .media-caption {
  padding: 12px 16px;
  font-size: var(--fs-xs);
  color: var(--slate);
  background: var(--slate-seat);
}

/* ---------- 服务承诺 ---------- */
.page-about .about-promise {
  margin: 8px 0 44px;
  padding: 30px 22px 32px;
  border: 0;
  border-radius: var(--radius-card);
  background: var(--bamboo);
  color: var(--paper);
}

.page-about .promise-kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.18em;
  color: var(--gold-sand);
}

.page-about .promise-title {
  margin: 0 0 16px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(21px, 5.4vw, var(--fs-2xl));
  line-height: 1.35;
  color: var(--paper);
}

.page-about .promise-text {
  margin: 0;
  max-width: 40em;
  font-size: var(--fs-base);
  line-height: 1.85;
  color: rgba(250, 246, 241, 0.92);
}

.page-about .promise-list {
  display: grid;
  gap: 14px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .promise-item {
  padding-top: 12px;
  border-top: 1px solid rgba(250, 246, 241, 0.28);
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: rgba(250, 246, 241, 0.88);
}

.page-about .promise-item .num {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-md);
  color: var(--gold-sand);
}

.page-about .promise-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-about .promise-link {
  display: inline-flex;
  align-items: center;
  padding: 9px 16px;
  border: 1px solid rgba(242, 227, 200, 0.5);
  border-radius: var(--radius-pill);
  font-size: var(--fs-sm);
  color: var(--gold-sand);
  text-decoration: none;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .promise-link:hover,
.page-about .promise-link:focus-visible {
  background: var(--gold-sand);
  border-color: var(--gold-sand);
  color: var(--zhu-deep);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-promise {
    padding: 38px 32px 40px;
  }

  .page-about .promise-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 26px;
  }

  .page-about .tl-node {
    flex-basis: 250px;
  }
}

@media (min-width: 900px) {
  .page-about .about-section {
    padding: 62px 0;
  }

  .page-about .about-section:first-child {
    padding-top: 40px;
  }

  .page-about .method-row {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 38px;
    align-items: center;
    padding: 32px 0;
  }

  .page-about .method-row:nth-child(even) .method-text {
    order: 2;
  }

  .page-about .method-row:nth-child(even) .method-fig {
    order: 1;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-promise {
    padding: 52px 46px 54px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-wrap {
    grid-template-columns: minmax(0, 1fr) var(--about-rail);
  }

  .page-about .about-rail {
    order: 0;
    position: sticky;
    top: 96px;
    align-self: start;
    margin: 62px 0 0;
    padding: 4px 0 4px 18px;
    border: 0;
    border-left: 1px solid var(--line);
    overflow: visible;
  }

  .page-about .about-rail nav {
    display: block;
  }

  .page-about .about-rail a {
    margin-left: -20px;
    padding: 8px 0 8px 16px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
  }

  .page-about .about-rail a:hover,
  .page-about .about-rail a:focus-visible {
    border-left-color: var(--zhu);
  }

  .page-about .about-rail a[aria-current="true"] {
    background: transparent;
    color: var(--zhu-deep);
    border-left-color: var(--zhu);
  }

  .page-about .about-title {
    max-width: 17em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail a,
  .page-about .promise-link {
    transition: none;
  }
}
<<<END>>>