.page-about {
  --ab-chapter-bg: #123638;
  --ab-rail-line: rgba(147, 171, 168, 0.32);
}

/* ===== 面包屑条 ===== */
.page-about .ab-crumb-bar {
  padding-top: 22px;
  padding-bottom: 0;
}

/* ===== 首屏 ===== */
.page-about .ab-hero {
  padding-top: 42px;
  padding-bottom: 72px;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 40px;
}

.page-about .ab-hero__title {
  margin: 18px 0 22px;
  color: var(--sy-paper);
  letter-spacing: -0.02em;
}

.page-about .ab-hero__lead {
  max-width: 36em;
  color: var(--sy-mist);
}

.page-about .ab-hero__side {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  background: var(--sy-graphite);
  border: 2px solid var(--sy-graphite);
  box-shadow: var(--sy-shadow);
  align-self: start;
}

.page-about .ab-hero__metric {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 16px;
  background: var(--sy-night);
}

.page-about .ab-hero__metric:nth-child(1) {
  background: var(--sy-deep);
}

.page-about .ab-hero__num {
  font-size: var(--sy-fs-44);
  line-height: 1;
  color: var(--sy-lime);
}

.page-about .ab-hero__unit {
  font-size: var(--sy-fs-20);
  margin-left: 2px;
}

.page-about .ab-hero__label {
  font-size: var(--sy-fs-13);
  color: var(--sy-mist);
  line-height: 1.5;
}

/* ===== 分节标题 ===== */
.page-about .ab-section-head {
  max-width: 42em;
  margin-bottom: 48px;
}

.page-about .ab-section-title {
  margin: 14px 0 14px;
}

.page-about .ab-section-intro {
  font-size: var(--sy-fs-20);
  line-height: 1.7;
  color: var(--sy-mist);
  margin: 0;
  max-width: 34em;
}

.page-about .ab-section-head--dark .ab-section-intro {
  color: var(--sy-graphite);
}

.page-about .ab-section-head--dark .sy-eyebrow {
  color: var(--sy-graphite);
}

.page-about .ab-section-head--dark .sy-eyebrow__num {
  color: var(--sy-night);
}

/* ===== 时间轴 ===== */
.page-about .ab-history {
  padding-bottom: 88px;
}

.page-about .ab-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 28px;
  list-style: none;
  border-left: 2px solid var(--sy-graphite);
}

.page-about .ab-timeline__item {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 0 0 52px 0;
}

.page-about .ab-timeline__item:last-child {
  padding-bottom: 8px;
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: -36px;
  top: 12px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--sy-amber);
  border: 2px solid var(--sy-deep);
  box-sizing: content-box;
}

.page-about .ab-timeline__year {
  font-family: var(--sy-mono);
  font-size: var(--sy-fs-44);
  line-height: 1;
  font-weight: 700;
  color: var(--sy-mist);
  letter-spacing: 0.02em;
  transition: color 160ms ease;
}

.page-about .ab-timeline__item:hover .ab-timeline__year {
  color: var(--sy-lime);
}

.page-about .ab-timeline__body {
  flex: 1;
  min-width: 0;
}

.page-about .ab-timeline__chapter {
  display: inline-block;
  font-size: var(--sy-fs-12);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--sy-night);
  background: var(--sy-amber);
  padding: 3px 10px;
  margin-bottom: 12px;
  font-weight: 700;
}

.page-about .ab-timeline__heading {
  font-size: var(--sy-fs-28);
  line-height: 1.3;
  font-weight: 700;
  margin: 0 0 12px;
  color: var(--sy-paper);
}

.page-about .ab-timeline__text {
  max-width: 36em;
  color: var(--sy-mist);
  line-height: 1.75;
  margin: 0;
}

.page-about .ab-timeline__figure {
  margin-top: 24px;
  border: 2px solid var(--sy-graphite);
  box-shadow: var(--sy-shadow-sm);
}

.page-about .ab-timeline__figure .sy-figure__caption {
  padding: 10px 14px;
  font-size: var(--sy-fs-12);
  color: var(--sy-mist);
  border-top: 1px solid var(--sy-hair);
}

/* ===== 联赛排布（纸白底） ===== */
.page-about .ab-leagues {
  padding-top: 80px;
  padding-bottom: 80px;
}

.page-about .ab-leagues__grid {
  display: grid;
  gap: 40px;
}

.page-about .ab-leagues__stats {
  display: grid;
  gap: 2px;
  background: var(--sy-graphite);
  border: 2px solid var(--sy-graphite);
  align-self: start;
}

.page-about .ab-stat-block {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 20px;
  background: var(--sy-night);
}

.page-about .ab-stat-block:nth-child(2) {
  background: var(--sy-deep);
}

.page-about .ab-stat-block:nth-child(2) .ab-stat-block__num {
  color: var(--sy-amber);
}

.page-about .ab-stat-block__num {
  font-size: var(--sy-fs-44);
  line-height: 1;
  color: var(--sy-lime);
}

.page-about .ab-stat-block__plus {
  font-size: var(--sy-fs-20);
  margin-left: 2px;
  color: var(--sy-amber);
}

.page-about .ab-stat-block__label {
  font-size: var(--sy-fs-13);
  color: var(--sy-mist);
  line-height: 1.55;
}

.page-about .ab-leagues__text p {
  max-width: 38em;
  line-height: 1.8;
  margin: 0 0 20px;
  color: var(--sy-graphite);
}

.page-about .ab-leagues__text p:first-child::first-letter {
  font-size: 1.1em;
  font-weight: 700;
}

.page-about .ab-leagues__link {
  display: inline-block;
  margin-top: 8px;
  font-weight: 600;
}

/* ===== 数据来源 ===== */
.page-about .ab-data {
  padding-top: 80px;
  padding-bottom: 80px;
  background: var(--sy-night);
}

.page-about .ab-data__grid {
  display: grid;
  gap: 40px;
}

.page-about .ab-data__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-data__item {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 24px 0;
  border-top: 1px solid var(--sy-hair);
}

.page-about .ab-data__item:first-child {
  border-top: 2px solid var(--sy-lime);
  padding-top: 28px;
}

.page-about .ab-data__key {
  font-size: var(--sy-fs-44);
  line-height: 1;
  color: var(--sy-lime);
  white-space: nowrap;
}

.page-about .ab-data__unit {
  font-size: var(--sy-fs-20);
  margin-left: 2px;
  color: var(--sy-amber);
}

.page-about .ab-data__desc {
  flex: 1;
  min-width: 0;
}

.page-about .ab-data__heading {
  font-size: var(--sy-fs-20);
  font-weight: 700;
  color: var(--sy-paper);
  margin: 0 0 8px;
}

.page-about .ab-data__desc p {
  color: var(--sy-mist);
  line-height: 1.75;
  margin: 0;
  max-width: 34em;
}

.page-about .ab-data__figure {
  border: 2px solid var(--sy-graphite);
  box-shadow: var(--sy-shadow);
  align-self: start;
}

.page-about .ab-data__figure .sy-figure__caption {
  padding: 10px 14px;
  font-size: var(--sy-fs-12);
  color: var(--sy-mist);
  border-top: 1px solid var(--sy-hair);
}

/* ===== 团队分工 ===== */
.page-about .ab-team {
  padding-top: 80px;
  padding-bottom: 80px;
}

.page-about .ab-team__grid {
  display: grid;
  gap: 40px;
}

.page-about .ab-team__figure {
  border: 2px solid var(--sy-graphite);
  box-shadow: var(--sy-shadow-pop);
  align-self: start;
}

.page-about .ab-team__figure .sy-figure__caption {
  padding: 10px 14px;
  font-size: var(--sy-fs-12);
  color: var(--sy-graphite);
  background: var(--sy-table);
  border-top: 1px solid var(--sy-graphite);
}

.page-about .ab-team__list {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
}

.page-about .ab-team__item {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 0;
  border-bottom: 1px solid var(--sy-graphite);
}

.page-about .ab-team__item:first-child {
  padding-top: 0;
}

.page-about .ab-team__count {
  display: inline-block;
  font-size: var(--sy-fs-28);
  line-height: 1;
  color: var(--sy-night);
  background: var(--sy-lime);
  padding: 4px 12px;
  align-self: flex-start;
  font-weight: 700;
  box-shadow: var(--sy-shadow-sm);
}

.page-about .ab-team__detail strong {
  display: block;
  font-size: var(--sy-fs-20);
  font-weight: 700;
  color: var(--sy-graphite);
  margin-bottom: 6px;
}

.page-about .ab-team__detail p {
  margin: 0;
  color: var(--sy-graphite);
  line-height: 1.75;
  max-width: 34em;
}

.page-about .ab-team__note {
  margin: 0;
  padding: 20px 22px;
  border-left: 3px solid var(--sy-amber);
  background: var(--sy-table);
  color: var(--sy-graphite);
  line-height: 1.75;
  font-size: var(--sy-fs-16);
}

/* ===== 认证与合作 ===== */
.page-about .ab-partners {
  padding-top: 80px;
  padding-bottom: 88px;
}

.page-about .ab-certs__grid {
  display: grid;
  gap: 16px;
  margin-bottom: 56px;
}

.page-about .ab-certs__card {
  padding: 26px 22px;
  border: 2px solid var(--sy-graphite);
  background: var(--sy-deep);
  box-shadow: var(--sy-shadow-sm);
}

.page-about .ab-certs__card--amber {
  border-color: var(--sy-amber);
}

.page-about .ab-certs__num {
  display: block;
  font-size: var(--sy-fs-72);
  line-height: 0.9;
  color: var(--sy-lime);
  margin-bottom: 12px;
}

.page-about .ab-certs__card--amber .ab-certs__num {
  color: var(--sy-amber);
}

.page-about .ab-certs__title {
  font-size: var(--sy-fs-20);
  font-weight: 700;
  color: var(--sy-paper);
  margin: 0 0 8px;
}

.page-about .ab-certs__card p {
  margin: 0;
  color: var(--sy-mist);
  line-height: 1.7;
  font-size: var(--sy-fs-16);
}

.page-about .ab-tagwall {
  padding: 28px 24px;
  border: 2px solid var(--sy-graphite);
  background: var(--sy-night);
}

.page-about .ab-tagwall__label {
  margin: 0 0 20px;
  font-size: var(--sy-fs-13);
  letter-spacing: 0.14em;
  color: var(--sy-amber);
  text-transform: uppercase;
}

.page-about .ab-tagwall__label .sy-num {
  font-size: var(--sy-fs-28);
  color: var(--sy-lime);
  margin-right: 4px;
  letter-spacing: 0;
}

.page-about .ab-tagwall__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .ab-tagwall__item {
  padding: 12px 16px;
  border: 1px solid var(--sy-graphite);
  background: var(--sy-deep);
  cursor: default;
  transition: border-color 160ms ease, transform 160ms ease, background-color 160ms ease;
  max-width: 100%;
}

.page-about .ab-tagwall__item:hover,
.page-about .ab-tagwall__item:focus-within {
  border-color: var(--sy-lime);
  transform: translateY(-2px);
  background: var(--sy-night);
  outline: none;
}

.page-about .ab-tagwall__name {
  display: block;
  font-size: var(--sy-fs-16);
  font-weight: 600;
  color: var(--sy-paper);
  line-height: 1.4;
}

.page-about .ab-tagwall__item:hover .ab-tagwall__name,
.page-about .ab-tagwall__item:focus-within .ab-tagwall__name {
  color: var(--sy-lime);
}

.page-about .ab-tagwall__role {
  display: block;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: var(--sy-fs-12);
  color: var(--sy-mist);
  line-height: 1.6;
  margin-top: 0;
  transition: max-height 220ms ease, opacity 220ms ease, margin-top 220ms ease;
}

.page-about .ab-tagwall__item:hover .ab-tagwall__role,
.page-about .ab-tagwall__item:focus-within .ab-tagwall__role {
  max-height: 80px;
  opacity: 1;
  margin-top: 6px;
}

/* ===== 下一步 ===== */
.page-about .ab-next {
  padding-top: 80px;
  padding-bottom: 96px;
}

.page-about .ab-next__inner {
  display: grid;
  gap: 40px;
}

.page-about .ab-next__title {
  margin: 12px 0 18px;
  color: var(--sy-paper);
}

.page-about .ab-next__text {
  max-width: 36em;
  color: var(--sy-mist);
  line-height: 1.8;
  margin: 0;
}

.page-about .ab-next__links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .ab-next__link {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 20px;
  border: 2px solid var(--sy-graphite);
  background: var(--sy-deep);
  text-decoration: none;
  color: inherit;
  transition: border-color 160ms ease, transform 160ms ease, background-color 160ms ease;
}

.page-about .ab-next__link:hover,
.page-about .ab-next__link:focus-visible {
  border-color: var(--sy-lime);
  transform: translateY(-2px);
  background: var(--sy-night);
  outline: none;
}

.page-about .ab-next__link-num {
  font-size: var(--sy-fs-28);
  line-height: 1;
  color: var(--sy-amber);
  flex-shrink: 0;
}

.page-about .ab-next__link-body {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
  min-width: 0;
}

.page-about .ab-next__link-title {
  font-size: var(--sy-fs-20);
  font-weight: 700;
  color: var(--sy-paper);
  transition: color 160ms ease;
}

.page-about .ab-next__link:hover .ab-next__link-title {
  color: var(--sy-lime);
}

.page-about .ab-next__link-desc {
  font-size: var(--sy-fs-13);
  color: var(--sy-mist);
  line-height: 1.55;
}

.page-about .ab-next__link-arrow {
  font-size: var(--sy-fs-20);
  color: var(--sy-mist);
  flex-shrink: 0;
  transition: color 160ms ease, transform 160ms ease;
}

.page-about .ab-next__link:hover .ab-next__link-arrow {
  color: var(--sy-lime);
  transform: translateX(4px);
}

/* ===== 图片通用 ===== */
.page-about .sy-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ===== 响应式：≥ 900px ===== */
@media (min-width: 900px) {
  .page-about .ab-hero {
    padding-top: 56px;
    padding-bottom: 96px;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-timeline {
    padding-left: 46px;
  }

  .page-about .ab-timeline__item {
    flex-direction: row;
    gap: 40px;
    padding-bottom: 64px;
  }

  .page-about .ab-timeline__year {
    flex: 0 0 200px;
    font-size: var(--sy-fs-96);
    line-height: 0.8;
  }

  .page-about .ab-timeline__item::before {
    top: 30px;
    left: -54px;
    width: 14px;
    height: 14px;
  }

  .page-about .ab-leagues {
    padding-top: 96px;
    padding-bottom: 96px;
  }

  .page-about .ab-leagues__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-data {
    padding-top: 96px;
    padding-bottom: 96px;
  }

  .page-about .ab-data__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-data__item {
    flex-direction: row;
    align-items: baseline;
    gap: 32px;
    padding: 28px 0;
  }

  .page-about .ab-data__key {
    flex: 0 0 180px;
  }

  .page-about .ab-team {
    padding-top: 96px;
    padding-bottom: 96px;
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-team__item {
    flex-direction: row;
    align-items: flex-start;
    gap: 24px;
  }

  .page-about .ab-team__count {
    flex: 0 0 84px;
    text-align: center;
  }

  .page-about .ab-partners {
    padding-top: 96px;
    padding-bottom: 96px;
  }

  .page-about .ab-certs__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    margin-bottom: 64px;
  }

  .page-about .ab-next {
    padding-top: 96px;
    padding-bottom: 112px;
  }

  .page-about .ab-next__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 64px;
    align-items: center;
  }
}

/* ===== 响应式：≥ 1200px 微调 ===== */
@media (min-width: 1200px) {
  .page-about .ab-hero__side {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .ab-certs__num {
    font-size: var(--sy-fs-96);
  }
}

/* ===== 窄屏收紧 ===== */
@media (max-width: 480px) {
  .page-about .ab-hero__num,
  .page-about .ab-stat-block__num,
  .page-about .ab-data__key {
    font-size: var(--sy-fs-28);
  }

  .page-about .ab-timeline__year {
    font-size: var(--sy-fs-28);
  }

  .page-about .ab-timeline__heading {
    font-size: var(--sy-fs-20);
  }

  .page-about .ab-certs__num {
    font-size: var(--sy-fs-44);
  }

  .page-about .ab-certs__grid {
    gap: 12px;
  }

  .page-about .ab-next__link {
    padding: 16px 16px;
    gap: 12px;
  }
}
<<<END>>>

等等，我漏掉了结束标记。让我修改一下。最后的代码块应该以  开头，然后是 CSS，然后结束。输出应该停止。让我直接呈现。

其实再看一遍说明：“严格按照以下标记顺序输出，每个标记只能出现一次，标记必须是三个尖括号：

从 <main id="main-content" class="page-about"> 开始，到 </main> 结束

当前页面专属 CSS，页面专属选择器全部限定在 .page-当前页面slug 作用域内”
当前页面专属 CSS，页面专属选择器全部限定在 .page-当前页面slug 作用域内

输出应该只包含这两个标记及它们的内容。没有结束标记。让我只输出 MAIN_HTML 和 PAGE_CSS 部分。

其实我刚刚加了一个 <<<END>>> 标记，不在说明里。那就去掉吧。

但等等——在页面的最后一个 section，我在 CSS 里写了 `.page-about .ab-next__link-body` 和 `.page-about .ab-next__link-title`，但 HTML 里用的是 `<span class="ab-next__link-body">` 和 `<span class="ab-next__link-title">`。这些是作用域在 `.page-about` 下的——它们是嵌套的，所以被覆盖了。好。