.page-about {
  --about-toc-w: 13rem;
  --about-rail: var(--border-thick);
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 阅读进度刻度 ---------- */
.page-about .about-progress {
  position: fixed;
  inset-inline: 0;
  inset-block-end: 0;
  height: var(--border-thick);
  z-index: 60;
  pointer-events: none;
  background: color-mix(in srgb, var(--color-line) 70%, transparent);
}

.page-about .about-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

/* ---------- 页头 ---------- */
.page-about .about-head {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding-block: var(--space-8) var(--space-6);
}

.page-about .about-title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: clamp(var(--text-2xl), 5.4vw, var(--text-4xl));
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  max-width: 24ch;
}

.page-about .about-lede {
  margin: 0;
  max-width: var(--measure);
  color: var(--color-ink-soft);
}

/* ---------- 开场叙事 ---------- */
.page-about .about-opening {
  padding-block-end: var(--space-6);
}

.page-about .about-block {
  position: relative;
  padding-inline-start: var(--space-3);
  border-inline-start: var(--about-rail) solid var(--color-primary);
}

.page-about .about-block--lead {
  max-width: 68ch;
}

.page-about .about-block--shift {
  margin-inline-start: 0;
}

.page-about .about-block h2 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-about .about-block h3 {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-about .about-block p {
  margin: 0 0 var(--space-2);
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-about .about-block p:last-child {
  margin-block-end: 0;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: var(--border-thin) solid var(--color-line);
  box-shadow: var(--shadow-2);
  background: var(--color-contrast-surface);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.7) contrast(1.06);
}

.page-about .about-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(
    195deg,
    color-mix(in srgb, var(--color-primary) 30%, transparent) 0%,
    color-mix(in srgb, var(--color-contrast-surface) 46%, transparent) 100%
  );
  mix-blend-mode: multiply;
}

.page-about .about-caption {
  margin: 0;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-muted);
  background: var(--color-surface);
}

.page-about .about-figure--inline {
  margin-block-start: var(--space-6);
  box-shadow: var(--shadow-1);
}

/* ---------- 正文布局：左侧锚点目录 + 纵向叙述 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  padding-block: var(--space-8) var(--section-y);
}

.page-about .about-toc {
  padding-inline-start: var(--space-3);
  border-inline-start: var(--border-thin) solid var(--color-line);
}

.page-about .about-toc__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

.page-about .about-toc ul {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc a {
  display: inline-block;
  padding-block: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  border-block-end: var(--border-thin) solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--color-primary);
  border-block-end-color: var(--color-primary);
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: var(--section-y);
  min-width: 0;
}

.page-about .about-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  min-width: 0;
}

/* ---------- 赛季主题带（横向时间线） ---------- */
.page-about .about-timeline {
  position: relative;
  padding: var(--space-6) var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-line);
  box-shadow: var(--shadow-2);
  overflow: hidden;
}

.page-about .about-timeline__head {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  max-width: 52ch;
}

.page-about .about-timeline__head h3 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  color: var(--color-contrast-ink);
}

.page-about .eyebrow--onDark {
  color: var(--color-contrast-accent);
}

.page-about .about-track {
  display: flex;
  gap: var(--space-3);
  margin: var(--space-4) 0 0;
  padding: var(--space-3) 0 0;
  list-style: none;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  background-image: repeating-linear-gradient(
    90deg,
    var(--color-contrast-line) 0 var(--border-thin),
    transparent var(--border-thin) var(--space-2)
  );
  background-repeat: no-repeat;
  background-position: top left;
  background-size: 100% var(--space-1);
}

.page-about .about-track::-webkit-scrollbar {
  height: var(--space-1);
}

.page-about .about-track::-webkit-scrollbar-thumb {
  background: var(--color-contrast-line);
  border-radius: var(--radius-pill);
}

.page-about .about-node {
  flex: 0 0 min(19rem, 76vw);
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: var(--border-thin) solid var(--color-contrast-line);
  background: color-mix(in srgb, var(--color-contrast-ink) 6%, transparent);
}

.page-about .about-node__stage {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
}

.page-about .about-node h4 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-contrast-ink);
}

.page-about .about-node p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}

/* ---------- 能力说明牌 ---------- */
.page-about .about-claims {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-claim {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: var(--border-thin) solid var(--color-line);
  background: color-mix(in srgb, var(--color-surface) 86%, transparent);
  box-shadow: var(--shadow-1);
  transition: border-color 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

.page-about .about-claim:hover,
.page-about .about-claim:focus-within {
  border-color: color-mix(in srgb, var(--color-primary) 46%, var(--color-line));
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
}

.page-about .about-claim h3 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-about .about-claim p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-about .about-claim__link {
  margin-block-start: var(--space-1);
  align-self: flex-start;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  text-decoration: none;
  border-block-end: var(--border-thin) solid var(--color-line);
  transition: color 160ms ease, border-color 160ms ease;
}

.page-about .about-claim__link:hover,
.page-about .about-claim__link:focus-visible {
  color: var(--color-primary);
  border-block-end-color: var(--color-primary);
}

/* ---------- 当前阶段清单 ---------- */
.page-about .about-now {
  margin: 0;
  padding: 0;
  list-style: none;
  border-block-start: var(--border-thin) solid var(--color-line);
}

.page-about .about-now li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-1);
  padding-block: var(--space-3);
  border-block-end: var(--border-thin) solid var(--color-line);
}

.page-about .about-now__key {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  color: var(--color-accent);
  letter-spacing: 0.02em;
}

.page-about .about-now__val {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
}

.page-about .about-next__item {
  padding-block-start: var(--space-2);
  border-block-start: var(--about-rail) solid var(--color-accent);
}

.page-about .about-next__item h3 {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-about .about-next__item p {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 收束 ---------- */
.page-about .about-closing {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  padding-block-end: var(--section-y-lg);
}

.page-about .about-cta {
  padding: var(--space-6) var(--space-4);
  border-radius: var(--radius-lg);
  background: linear-gradient(
    140deg,
    var(--color-primary) 0%,
    color-mix(in srgb, var(--color-primary) 55%, var(--color-accent)) 62%,
    var(--color-accent) 100%
  );
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-2);
}

.page-about .about-cta h2 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-primary-ink);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 62ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-primary-ink) 90%, transparent);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-block: var(--space-4) var(--space-3);
}

.page-about .about-cta__note {
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-primary-ink) 84%, transparent);
}

.page-about .about-cta__note a {
  color: var(--color-primary-ink);
  text-decoration: underline;
  text-underline-offset: 0.24em;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-claims {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-next {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-4);
  }

  .page-about .about-now li {
    grid-template-columns: 12rem minmax(0, 1fr);
    gap: var(--space-4);
    align-items: baseline;
  }

  .page-about .about-block--shift {
    margin-inline-start: var(--space-6);
  }

  .page-about .about-figure--inline {
    margin-inline-end: var(--space-6);
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--about-toc-w) minmax(0, 1fr);
    column-gap: var(--space-8);
    row-gap: 0;
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: var(--space-8);
    align-self: start;
  }

  .page-about .about-toc ul {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
  }

  .page-about .about-toc a {
    display: block;
    padding-inline-start: var(--space-2);
    margin-inline-start: calc(var(--space-2) * -1);
    border-inline-start: var(--about-rail) solid transparent;
    border-block-end-color: transparent;
  }

  .page-about .about-toc a:hover,
  .page-about .about-toc a:focus-visible {
    border-inline-start-color: var(--color-primary);
  }

  .page-about .about-block--shift {
    margin-inline-start: var(--space-8);
  }

  .page-about .about-timeline {
    padding: var(--space-8) var(--space-6);
  }

  .page-about .about-cta {
    padding: var(--space-8) var(--space-6);
  }
}

@media (min-width: 1200px) {
  .page-about .about-claims {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-node {
    flex-basis: 20rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-claim,
  .page-about .about-toc a,
  .page-about .about-claim__link {
    transition: none;
  }

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