.page-about {
  --about-wash-cyan: rgba(70, 242, 208, 0.09);
  --about-wash-orange: rgba(255, 138, 61, 0.1);
  --about-measure: 44rem;
  display: block;
  padding-bottom: clamp(2.5rem, 7vw, 5rem);
}

.page-about a:focus-visible,
.page-about button:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 0.5rem;
}

.page-about .breadcrumb {
  padding-top: 1.5rem;
  justify-content: center;
  font-family: var(--font-data);
  font-size: var(--fs-caption);
}

.page-about .breadcrumb__link {
  color: var(--muted);
  text-decoration: none;
  transition: color var(--t-micro) var(--ease);
}

.page-about .breadcrumb__link:hover {
  color: var(--cyan);
}

.page-about .about-hero__inner {
  max-width: 44rem;
  margin: 2rem auto 0;
  text-align: center;
}

.page-about .about-title {
  margin: 0.75rem 0 0;
  font-family: var(--font-head);
  font-size: clamp(2rem, 4.6vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.12;
  color: var(--text);
}

.page-about .about-lede {
  margin: 1.25rem auto 0;
  max-width: 40rem;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 锚点目录 ---------- */
.page-about .about-toc {
  margin-top: 2.25rem;
}

.page-about .about-toc__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc__link {
  display: inline-block;
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--grid);
  border-radius: var(--r-pill);
  font-family: var(--font-data);
  font-size: var(--fs-caption);
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--t-micro) var(--ease), border-color var(--t-micro) var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 首屏主图 ---------- */
.page-about .about-cover {
  margin: clamp(2rem, 5vw, 3.25rem) 0 0;
}

.page-about .about-cover__media {
  margin: 0;
}

.page-about .about-cover__media .media__img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding-block: clamp(2.75rem, 6vw, 4.5rem);
}

.page-about .about-section--panel {
  background: var(--panel);
  border-block: 1px solid var(--grid-soft);
}

.page-about .about-head {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  max-width: var(--about-measure);
  margin: 0 auto 1.75rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--grid);
}

.page-about .about-head__num {
  flex: none;
  font-family: var(--font-data);
  font-size: var(--fs-caption);
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-head__title {
  margin: 0;
  font-size: var(--fs-h2);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: var(--text);
}

.page-about .about-prose {
  max-width: var(--about-measure);
  margin-inline: auto;
}

.page-about .about-prose p {
  margin: 0 0 1.35rem;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-prose p + p {
  padding-top: 1.35rem;
  border-top: 1px solid var(--grid-soft);
}

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

/* ---------- 三层数据体系 ---------- */
.page-about .about-layers__grid {
  display: grid;
  gap: 2rem;
  align-items: start;
}

.page-about .about-layers__visual {
  display: flex;
  justify-content: center;
}

.page-about .about-rings {
  width: min(100%, 360px);
  height: auto;
}

.page-about .about-rings text {
  text-anchor: middle;
  font-family: var(--font-head);
}

.page-about .about-rings__out {
  fill: var(--orange-soft);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .about-rings__mid {
  fill: var(--muted);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .about-rings__in {
  fill: var(--cyan);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.page-about .about-rings__sub {
  fill: var(--faint);
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.02em;
}

.page-about .about-layer-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.75rem;
}

.page-about .about-layer {
  padding: 1.1rem 1.25rem;
  border: 1px solid var(--grid);
  border-radius: var(--r-lg);
  background: var(--card);
}

.page-about .about-layer--player {
  border-left: 3px solid var(--cyan);
}

.page-about .about-layer--ref {
  border-left: 3px solid var(--cyan-dim);
}

.page-about .about-layer--event {
  border-left: 3px solid var(--orange);
}

.page-about .about-layer__tag {
  font-family: var(--font-data);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--faint);
}

.page-about .about-layer__title {
  margin: 0.35rem 0 0.5rem;
  font-size: var(--fs-h3);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-layer__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-layers__foot {
  max-width: var(--about-measure);
  margin: 2rem auto 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--grid-soft);
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 梯队对照 ---------- */
.page-about .about-academy__intro {
  display: grid;
  gap: 1.75rem;
  margin-bottom: 2rem;
}

.page-about .about-academy__lede {
  margin: 0;
  max-width: var(--about-measure);
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-academy__figure {
  margin: 0;
}

.page-about .about-academy__figure .media__img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-compare .filter-bar {
  margin-bottom: 1.25rem;
}

.page-about .about-compare__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  margin-bottom: 0.75rem;
  font-family: var(--font-data);
  font-size: var(--fs-caption);
}

.page-about .about-compare__legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--muted);
}

.page-about .about-compare__legend-item::before {
  content: "";
  width: 14px;
  height: 4px;
  border-radius: var(--r-pill);
}

.page-about .about-compare__legend-item--youth::before {
  background: var(--cyan);
}

.page-about .about-compare__legend-item--first::before {
  background: var(--orange);
}

.page-about .about-compare__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.5rem;
}

.page-about .about-compare__row {
  padding: 1rem 1.15rem;
  border: 1px solid var(--grid-soft);
  border-radius: var(--r-md);
  background: var(--card);
  transition: opacity var(--t-state) var(--ease), border-color var(--t-state) var(--ease);
}

.page-about .about-compare__row:hover {
  border-color: var(--grid);
}

.page-about .about-compare__row.is-dim {
  opacity: 0.4;
}

.page-about .about-compare__top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.35rem 1rem;
  margin-bottom: 0.75rem;
}

.page-about .about-compare__field {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-compare__delta {
  font-family: var(--font-data);
  font-size: var(--fs-caption);
  color: var(--cyan);
}

.page-about .about-compare__delta--down {
  color: var(--orange-soft);
}

.page-about .about-compare__bars {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
}

.page-about .c-bar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.page-about .c-bar__track {
  flex: 1 1 auto;
  height: 8px;
  min-width: 0;
  background: rgba(30, 74, 82, 0.5);
  border-radius: var(--r-pill);
  overflow: hidden;
}

.page-about .c-bar__fill {
  display: block;
  height: 100%;
  border-radius: var(--r-pill);
}

.page-about .c-bar--youth .c-bar__fill {
  background: linear-gradient(90deg, var(--cyan-dim), var(--cyan));
}

.page-about .c-bar--first .c-bar__fill {
  background: linear-gradient(90deg, var(--orange), var(--orange-soft));
}

.page-about .c-bar__val {
  flex: none;
  min-width: 3.6rem;
  text-align: right;
  font-family: var(--font-data);
  font-size: var(--fs-caption);
  font-weight: 500;
  color: var(--text);
}

.page-about .about-compare__note {
  margin: 1.5rem 0 0;
  max-width: var(--about-measure);
  padding-left: 1.1rem;
  border-left: 2px solid var(--cyan);
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 回溯校对 ---------- */
.page-about .about-review__figure {
  max-width: 52rem;
  margin: 2.25rem auto 0;
}

.page-about .about-review__figure .media__img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 时间轴 ---------- */
.page-about .about-tl {
  margin: 0 0 0 0.5rem;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--grid);
}

.page-about .about-tl__item {
  position: relative;
  padding-left: 2rem;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.5rem;
  width: 9px;
  height: 9px;
  margin-left: -5px;
  border-radius: 50%;
  background: var(--orange);
  transition: background var(--t-state) var(--ease), box-shadow var(--t-state) var(--ease);
}

.page-about .about-tl__node[open] {
  background: linear-gradient(90deg, var(--about-wash-cyan), transparent 68%);
}

.page-about .about-tl__summary {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  padding: 1.1rem 0.5rem 1.1rem 0;
  cursor: pointer;
  list-style: none;
  border-bottom: 1px solid var(--grid-soft);
  transition: color var(--t-state) var(--ease);
}

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

.page-about .about-tl__summary:hover .about-tl__title {
  color: var(--cyan);
}

.page-about .about-tl__year {
  flex: none;
  font-family: var(--font-data);
  font-size: 1.0625rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--orange);
}

.page-about .about-tl__title {
  flex: 1 1 auto;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text);
  transition: color var(--t-state) var(--ease);
}

.page-about .about-tl__marker {
  position: relative;
  flex: none;
  align-self: center;
  width: 18px;
  height: 18px;
  border: 1px solid var(--grid);
  border-radius: 50%;
  transition: border-color var(--t-state) var(--ease);
}

.page-about .about-tl__marker::before,
.page-about .about-tl__marker::after {
  content: "";
  position: absolute;
  background: var(--muted);
  transition: transform var(--t-state) var(--ease), background var(--t-state) var(--ease);
}

.page-about .about-tl__marker::before {
  left: 4px;
  right: 4px;
  top: 8px;
  height: 1px;
}

.page-about .about-tl__marker::after {
  top: 4px;
  bottom: 4px;
  left: 8px;
  width: 1px;
}

.page-about .about-tl__node[open] .about-tl__marker {
  border-color: var(--cyan);
}

.page-about .about-tl__node[open] .about-tl__marker::before {
  background: var(--cyan);
}

.page-about .about-tl__node[open] .about-tl__marker::after {
  transform: scaleY(0);
}

.page-about .about-tl__body {
  margin: 0;
  padding: 0.65rem 0.5rem 1.25rem 0;
  max-width: 60ch;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 团队角色 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 2rem;
}

.page-about .about-team__note {
  margin: 0;
  padding: 1.15rem 1.25rem;
  border-radius: var(--r-lg);
  background: var(--about-wash-orange);
  border: 1px solid rgba(255, 138, 61, 0.28);
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--text);
}

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

.page-about .about-role {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0 1.15rem;
  padding-block: 1.35rem;
  border-top: 1px solid var(--grid-soft);
}

.page-about .about-role:last-child {
  border-bottom: 1px solid var(--grid-soft);
}

.page-about .about-role__num {
  padding-top: 0.25rem;
  font-family: var(--font-data);
  font-size: var(--fs-caption);
  color: var(--orange);
}

.page-about .about-role__title {
  margin: 0 0 0.4rem;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-role__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 内容边界与后续入口 ---------- */
.page-about .about-note {
  max-width: var(--about-measure);
  margin: 1.75rem auto 0;
  padding: 1.1rem 1.25rem 1.1rem 1.4rem;
  border-left: 2px solid var(--orange);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: linear-gradient(90deg, var(--about-wash-orange), transparent 72%);
}

.page-about .about-note__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-note__text a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-next {
  display: grid;
  gap: 0.75rem;
  max-width: var(--about-measure);
  margin: 2.25rem auto 0;
}

.page-about .about-next__link {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1rem 1.15rem;
  border: 1px solid var(--grid);
  border-radius: var(--r-md);
  text-decoration: none;
  transition: border-color var(--t-state) var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--cyan);
}

.page-about .about-next__label {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-next__link:hover .about-next__label {
  color: var(--cyan);
}

.page-about .about-next__desc {
  font-size: var(--fs-caption);
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-next {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-compare__bars {
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem 1.5rem;
  }
}

@media (min-width: 960px) {
  .page-about .about-layers__grid {
    grid-template-columns: 5fr 7fr;
    gap: 3rem;
    align-items: center;
  }

  .page-about .about-academy__intro {
    grid-template-columns: 5fr 7fr;
    gap: 2.5rem;
    align-items: center;
  }

  .page-about .about-team__grid {
    grid-template-columns: 4fr 8fr;
    gap: 2.75rem;
    align-items: start;
  }

  .page-about .about-tl__item {
    padding-left: 2.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
  }
}
<<<END>>>