.page-about .about-hero {
  position: relative;
  padding: clamp(30px, 5vw, 60px) 0 clamp(26px, 4vw, 46px);
  border-bottom: 1px solid var(--fsa-line);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(34, 49, 74, 0.55) 0 1px,
    transparent 1px 92px
  );
  opacity: 0.45;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 48px);
  align-items: end;
}

.page-about .about-hero__lead .fsa-h1 {
  margin: 10px 0 0;
  max-width: 20ch;
}

.page-about .about-hero__lead .fsa-lede {
  max-width: 62ch;
  margin-top: 16px;
}

.page-about .about-hero__lead .fsa-actions {
  margin-top: 22px;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--fsa-line);
  border: 1px solid var(--fsa-line);
  border-radius: var(--fsa-r);
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--fsa-panel);
  padding: 16px 18px;
}

.page-about .about-stat dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--fsa-muted);
}

.page-about .about-stat dd {
  margin: 10px 0 0;
  font-size: 14px;
  color: var(--fsa-text);
}

.page-about .about-stat dd .fsa-num {
  display: block;
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1.1;
  color: var(--fsa-accent);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

/* 赛季锚点 + 内容面板 */
.page-about .about-timeline__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .about-rail ol {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail li {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: block;
  padding: 10px 14px;
  border: 1px solid var(--fsa-line);
  border-radius: 999px;
  color: var(--fsa-muted);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.3;
  white-space: nowrap;
  transition: color var(--fsa-t-fast), border-color var(--fsa-t-fast), background var(--fsa-t-fast);
}

.page-about .about-rail__link span {
  display: block;
  margin-top: 3px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--fsa-muted);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--fsa-text);
  border-color: var(--fsa-accent);
  outline: none;
}

.page-about .about-rail__link:focus-visible {
  box-shadow: 0 0 0 3px rgba(47, 211, 233, 0.28);
}

.page-about .about-era {
  position: relative;
  margin-bottom: 14px;
  padding: clamp(18px, 3vw, 30px) clamp(18px, 3vw, 30px) clamp(18px, 3vw, 28px) clamp(22px, 3.4vw, 36px);
  background: var(--fsa-panel);
  border: 1px solid var(--fsa-line);
  border-radius: var(--fsa-r);
  scroll-margin-top: 120px;
  overflow: hidden;
  transition: border-color var(--fsa-t-fast), transform var(--fsa-t-fast);
}

.page-about .about-era::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  background: var(--era-color, var(--fsa-accent));
}

.page-about .about-era:hover {
  transform: translateY(-2px);
  border-color: rgba(47, 211, 233, 0.55);
}

.page-about .about-era:nth-of-type(1) { --era-color: #a8e63c; }
.page-about .about-era:nth-of-type(2) { --era-color: #8ed95f; }
.page-about .about-era:nth-of-type(3) { --era-color: #f5a524; }
.page-about .about-era:nth-of-type(4) { --era-color: #d7e3f2; }
.page-about .about-era:nth-of-type(5) { --era-color: #b9cbe2; }
.page-about .about-era:nth-of-type(6) { --era-color: #2fd3e9; }

.page-about .about-era__tag {
  display: inline-block;
  margin: 0 0 10px;
}

.page-about .about-era .fsa-h3 {
  margin: 0 0 10px;
}

.page-about .about-era .fsa-text {
  margin: 0;
  max-width: 64ch;
}

.page-about .about-era__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 14px 0 0;
  border-top: 1px dashed var(--fsa-line);
  display: grid;
  gap: 8px;
}

.page-about .about-era__list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--fsa-muted);
}

.page-about .about-era__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 2px;
  background: var(--era-color, var(--fsa-accent));
}

/* 图片容器 */
.page-about .about-figure {
  margin: 26px 0 0;
  border: 1px solid var(--fsa-line);
  border-radius: var(--fsa-r);
  overflow: hidden;
  background: var(--fsa-panel);
}

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

.page-about .about-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--fsa-muted);
  border-top: 1px solid var(--fsa-line);
}

.page-about .about-figure--band {
  margin-top: 22px;
}

/* 三条内容线 */
.page-about .about-lines {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-line {
  display: flex;
  flex-direction: column;
  padding: 22px 20px;
  border: 1px solid var(--fsa-line);
  border-radius: var(--fsa-r);
  background: linear-gradient(180deg, var(--fsa-panel) 0%, rgba(7, 12, 22, 0.35) 100%);
  transition: transform var(--fsa-t-fast), border-color var(--fsa-t-fast);
}

.page-about .about-line:hover,
.page-about .about-line:focus-within {
  transform: translateY(-2px);
  border-color: var(--fsa-accent);
}

.page-about .about-line__tag {
  align-self: flex-start;
  margin: 0 0 12px;
}

.page-about .about-line .fsa-h3 {
  margin: 0 0 10px;
}

.page-about .about-line > .fsa-text {
  margin: 0;
}

.page-about .about-line__reveal {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--fsa-line);
  opacity: 0.68;
  transform: translateY(2px);
  transition: opacity var(--fsa-t-fast), transform var(--fsa-t-fast);
}

.page-about .about-line:hover .about-line__reveal,
.page-about .about-line:focus-within .about-line__reveal {
  opacity: 1;
  transform: none;
}

.page-about .about-line__label {
  margin: 0 0 6px;
  font-family: var(--fsa-font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--fsa-accent);
}

.page-about .about-line__reveal .fsa-text {
  margin: 0;
  font-size: 15px;
}

/* 数据链路 */
.page-about .about-flow {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  counter-reset: none;
}

.page-about .about-flow__step {
  position: relative;
  padding: 20px 18px 22px 0;
}

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: var(--fsa-line);
}

.page-about .about-flow__num {
  margin: 0 0 8px;
  font-family: var(--fsa-font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--fsa-accent);
}

.page-about .about-flow .fsa-h3 {
  margin: 0 0 8px;
}

.page-about .about-flow .fsa-text {
  margin: 0;
  font-size: 15px;
}

/* 团队 */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .about-team .about-figure {
  margin-top: 0;
}

.page-about .about-team__cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-team__item {
  padding: 20px;
  border: 1px solid var(--fsa-line);
  border-radius: var(--fsa-r);
  background: var(--fsa-panel);
  transition: border-color var(--fsa-t-fast), transform var(--fsa-t-fast);
}

.page-about .about-team__item:hover,
.page-about .about-team__item:focus-within {
  transform: translateY(-2px);
  border-color: rgba(47, 211, 233, 0.6);
}

.page-about .about-team__num {
  margin: 0;
  font-size: clamp(38px, 5vw, 56px);
  line-height: 1;
  color: var(--fsa-accent);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
}

.page-about .about-team__item .fsa-h3 {
  margin: 12px 0 8px;
}

.page-about .about-team__item .fsa-text {
  margin: 0;
  font-size: 15px;
}

/* 覆盖与用户构成 */
.page-about .about-coverage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--fsa-line);
  border: 1px solid var(--fsa-line);
  border-radius: var(--fsa-r);
  overflow: hidden;
}

.page-about .about-coverage__item {
  background: var(--fsa-panel);
  padding: 20px 18px;
}

.page-about .about-coverage__num {
  margin: 0 0 10px;
  font-size: clamp(30px, 4vw, 42px);
  line-height: 1;
  color: var(--fsa-winter);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
}

.page-about .about-coverage__item .fsa-text {
  margin: 0;
  font-size: 15px;
}

/* 留存指标 */
.page-about .about-metrics {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-metrics__item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 18px;
  border: 1px solid var(--fsa-line);
  border-left: 3px solid var(--fsa-accent);
  border-radius: var(--fsa-r-sm);
  background: rgba(16, 27, 45, 0.75);
}

.page-about .about-metrics__num {
  flex: 0 0 auto;
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1;
  color: var(--fsa-text);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
}

.page-about .about-metrics__label {
  font-size: 15px;
  line-height: 1.55;
  color: var(--fsa-muted);
}

/* 下一步 */
.page-about .about-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-next__item {
  display: block;
  padding: 18px 20px;
  border: 1px solid var(--fsa-line);
  border-radius: var(--fsa-r);
  background: var(--fsa-panel);
  text-decoration: none;
  transition: transform var(--fsa-t-fast), border-color var(--fsa-t-fast), background var(--fsa-t-fast);
}

.page-about .about-next__item:hover,
.page-about .about-next__item:focus-visible {
  transform: translateY(-2px);
  border-color: var(--fsa-accent);
  background: rgba(47, 211, 233, 0.06);
  outline: none;
}

.page-about .about-next__item:focus-visible {
  box-shadow: 0 0 0 3px rgba(47, 211, 233, 0.3);
}

.page-about .about-next__title {
  display: block;
  font-family: var(--fsa-font-display);
  font-size: 19px;
  letter-spacing: 0.01em;
  color: var(--fsa-text);
}

.page-about .about-next__desc {
  display: block;
  margin-top: 7px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--fsa-muted);
}

@media (min-width: 700px) {
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 26px;
  }

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

  .page-about .about-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-metrics {
    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);
  }

  .page-about .about-timeline__grid {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-rail ol {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
    border-left: 1px solid var(--fsa-line);
  }

  .page-about .about-rail li {
    width: 100%;
  }

  .page-about .about-rail__link {
    border: none;
    border-left: 2px solid transparent;
    border-radius: 0;
    margin-left: -1px;
    padding: 14px 12px 14px 16px;
    white-space: normal;
    font-size: 15px;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--fsa-accent);
    background: rgba(47, 211, 233, 0.07);
  }

  .page-about .about-rail__link:focus-visible {
    box-shadow: none;
    outline: 2px solid var(--fsa-accent);
    outline-offset: -2px;
  }

  .page-about .about-lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: 22px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(20px, 3vw, 34px);
    align-items: start;
  }

  .page-about .about-team__cols {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .page-about .about-team__item {
    display: grid;
    grid-template-columns: 96px minmax(0, 1fr);
    column-gap: 18px;
    align-items: baseline;
    padding: 18px 20px;
  }

  .page-about .about-team__num {
    grid-row: 1 / span 2;
    font-size: 44px;
  }

  .page-about .about-team__item .fsa-h3 {
    margin: 0 0 6px;
  }

  .page-about .about-team__item .fsa-text {
    grid-column: 2;
  }

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

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

@media (min-width: 1180px) {
  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-era,
  .page-about .about-line,
  .page-about .about-line__reveal,
  .page-about .about-team__item,
  .page-about .about-next__item {
    transition: none;
  }

  .page-about .about-era:hover,
  .page-about .about-line:hover,
  .page-about .about-team__item:hover,
  .page-about .about-next__item:hover {
    transform: none;
  }

  .page-about .about-line__reveal {
    opacity: 1;
    transform: none;
  }
}
<<<END>>>