.page-about {
  --about-gutter: 28px;
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-masthead {
  padding-block: 28px 8px;
}

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

.page-about .about-title {
  font-family: var(--font-sans);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.08;
  font-size: clamp(28px, 6.4vw, 56px);
  margin: 10px 0 16px;
  max-width: 20em;
}

.page-about .about-lede {
  max-width: 38em;
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
  margin-bottom: 26px;
}

.page-about .about-hero {
  margin-top: 8px;
}

.page-about .about-hero img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--rule);
  background: var(--mist);
}

.page-about .about-figure {
  margin-block: 30px;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--rule);
  background: var(--mist);
}

/* ---------- 主体两栏：年份索引 + 正文 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  padding-bottom: 64px;
  padding-top: 12px;
}

.page-about .about-index {
  border-top: 3px solid var(--blue);
  padding-top: 12px;
  padding-bottom: 6px;
}

.page-about .about-index__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--warm);
  margin: 0 0 10px;
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 6px;
  flex: 0 0 auto;
  padding: 8px 12px;
  text-decoration: none;
  color: var(--ink);
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--glass);
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--blue);
}

.page-about .about-index__txt {
  font-size: 12.5px;
  color: var(--warm);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--blue);
  background: var(--mist);
  outline: none;
}

.page-about .about-index__foot {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--warm);
}

/* ---------- 章节通用 ---------- */
.page-about .about-flow {
  min-width: 0;
}

.page-about .about-sec {
  padding-block: 34px 38px;
  border-top: 1px solid var(--rule);
  scroll-margin-top: 24px;
}

.page-about .about-sec:first-child {
  border-top: none;
  padding-top: 8px;
}

.page-about .about-h2 {
  font-family: var(--font-sans);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.18;
  font-size: clamp(22px, 4.6vw, 32px);
  margin: 0 0 16px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-h2 .index-number {
  color: var(--orange-ink);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.page-about .about-sub {
  max-width: 36em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--warm);
  margin: 0 0 22px;
}

.page-about .prose p {
  max-width: 36em;
  font-size: 16.5px;
  line-height: 1.78;
  margin: 0 0 16px;
}

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

.page-about .prose a,
.page-about .about-switch a,
.page-about .about-side a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .prose a:hover,
.page-about .about-switch a:hover,
.page-about .about-side a:hover {
  color: var(--deep);
}

/* ---------- 旁注 ---------- */
.page-about .about-side {
  margin-top: 22px;
  border-left: 2px solid var(--blue);
  padding-left: 14px;
}

.page-about .about-side__note {
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.85;
  color: var(--warm);
  margin: 0 0 12px;
}

.page-about .about-side__link {
  margin: 0;
  font-size: 13.5px;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  padding-left: 26px;
  margin-bottom: 26px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 3px;
  border-radius: 2px;
  background: var(--blue);
}

.page-about .tl-item {
  position: relative;
  background: var(--glass);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 14px 16px;
  transition: border-color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 20px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--paper);
  border: 3px solid var(--blue);
}

.page-about .tl-item--current {
  border-color: var(--orange);
  background: var(--paper);
}

.page-about .tl-item--current::before {
  background: var(--orange);
  border-color: var(--orange);
  width: 19px;
  height: 19px;
  left: -29px;
  top: 17px;
}

.page-about .tl-item:hover {
  transform: translateY(-2px);
  border-color: var(--blue);
}

.page-about .tl-item__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-item__ver {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--blue);
}

.page-about .tl-item--current .tl-item__ver {
  color: var(--orange-ink);
}

.page-about .tl-item__tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--warm);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 2px 8px;
}

.page-about .tl-item__body {
  margin-top: 10px;
  border-top: 1px dashed var(--rule);
  padding-top: 10px;
}

.page-about .tl-item__body p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.75;
  max-width: 34em;
}

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

/* ---------- 季度切换块 ---------- */
.page-about .about-switch {
  background: var(--mist);
  border-radius: var(--radius);
  padding: 18px 20px;
  border-left: 4px solid var(--orange);
}

.page-about .about-switch__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange-ink);
  margin: 0 0 8px;
}

.page-about .about-switch__text {
  font-size: 15.5px;
  line-height: 1.78;
  margin: 0 0 10px;
  max-width: 36em;
  color: var(--ink);
}

.page-about .about-switch__links {
  margin: 0;
  font-size: 13.5px;
}

/* ---------- 团队条形图 ---------- */
.page-about .team-bar {
  display: flex;
  height: 62px;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--rule);
  margin-bottom: 20px;
}

.page-about .team-bar__seg {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  transition: filter 180ms var(--ease);
  min-width: 0;
}

.page-about .team-bar__seg:hover {
  filter: brightness(1.08);
}

.page-about .team-bar__seg--advisor {
  flex: 18 1 0;
  background: var(--blue);
  color: #FFFFFF;
}

.page-about .team-bar__seg--editor {
  flex: 12 1 0;
  background: var(--deep);
  color: #FFFFFF;
}

.page-about .team-bar__seg--tech {
  flex: 16 1 0;
  background: var(--mist);
  color: var(--ink);
}

.page-about .team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .team-list__item {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 16px 18px;
  background: var(--glass);
}

.page-about .team-list__item--advisor {
  border-left: 4px solid var(--blue);
}

.page-about .team-list__item--editor {
  border-left: 4px solid var(--deep);
}

.page-about .team-list__item--tech {
  border-left: 4px solid var(--orange);
}

.page-about .team-list__num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  margin: 0 0 6px;
  color: var(--blue);
}

.page-about .team-list__item--editor .team-list__num {
  color: var(--deep);
}

.page-about .team-list__item--tech .team-list__num {
  color: var(--orange-ink);
}

.page-about .team-list__name {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 8px;
}

.page-about .team-list__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--warm);
}

/* ---------- 三条长期做法 ---------- */
.page-about .practice-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-left: 2px solid var(--rule);
}

.page-about .practice-item {
  padding: 4px 0 22px 18px;
  border-left: 2px solid transparent;
  margin-left: -2px;
}

.page-about .practice-item:last-child {
  padding-bottom: 6px;
}

.page-about .practice-item__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--warm);
  margin: 0 0 6px;
}

.page-about .practice-item__title {
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--ink);
}

.page-about .practice-item__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--warm);
  max-width: 34em;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: 34px;
  padding: 22px 20px;
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--paper);
  display: grid;
  gap: 14px;
}

.page-about .about-cta__text {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: clamp(17px, 3.6vw, 22px);
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.page-about .about-cta__actions {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-cta__actions .btn {
  text-decoration: none;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 768px) {
  .page-about .about-body {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 36px;
    padding-top: 20px;
  }

  .page-about .about-index {
    position: sticky;
    top: 24px;
    align-self: start;
    border-top-width: 3px;
    padding-top: 14px;
  }

  .page-about .about-index__list {
    flex-direction: column;
    overflow: visible;
    gap: 0;
    padding: 0;
  }

  .page-about .about-index__link {
    border: none;
    border-radius: 0;
    background: transparent;
    padding: 9px 0 9px 12px;
    border-left: 3px solid transparent;
    justify-content: flex-start;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    border-left-color: var(--orange);
    background: transparent;
  }

  .page-about .about-index__num {
    font-size: 14px;
  }

  .page-about .about-index__txt {
    font-size: 12px;
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    padding-left: 0;
    padding-top: 40px;
  }

  .page-about .about-timeline::before {
    left: 0;
    right: 0;
    top: 16px;
    bottom: auto;
    width: auto;
    height: 3px;
  }

  .page-about .tl-item::before {
    left: 20px;
    top: -31px;
  }

  .page-about .tl-item--current::before {
    left: 17px;
    top: -34px;
  }

  .page-about .tl-item__head {
    flex-direction: column;
    gap: 4px;
  }

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

  .page-about .about-cta {
    grid-template-columns: 1fr auto;
    align-items: center;
    padding: 26px 28px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: 52px;
  }

  .page-about .about-sec {
    padding-block: 44px 48px;
  }

  .page-about .about-sec .grid--editorial {
    gap: 34px;
  }

  .page-about .about-side {
    margin-top: 4px;
  }

  .page-about .about-cta__text {
    max-width: 24em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-item,
  .page-about .team-bar__seg,
  .page-about .about-index__link {
    transition: none;
  }

  .page-about .tl-item:hover {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>