.page-about {
  background: var(--mist);
  color: var(--graphite);
  font-family: var(--body);
  line-height: 1.85;
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-family: var(--head);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.22;
  color: var(--ink);
}

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

.page-about .mono {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

/* 面包屑 */
.page-about .about-crumbs {
  padding-top: 20px;
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--graphite);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-2);
}

.page-about .breadcrumb a {
  color: var(--jiang);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.24s var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  border-bottom-color: var(--jiang);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding: 8px 0 0;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--line-2);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 28px;
  padding: 20px 0 32px;
}

.page-about .about-hero__text {
  border-left: 2px solid var(--jiang);
  padding-left: 16px;
}

.page-about .about-hero h1 {
  margin-top: 10px;
  font-size: clamp(1.9rem, 7vw, 3.2rem);
  letter-spacing: -0.03em;
}

.page-about .about-hero__lead {
  margin: 16px 0 0;
  font-size: 1rem;
  max-width: 34em;
}

.page-about .about-hero__sub {
  margin: 12px 0 0;
  font-size: 0.92rem;
  color: var(--jiang-deep);
  border-top: 1px solid var(--line);
  padding-top: 10px;
  max-width: 34em;
}

.page-about .about-hero__fig {
  margin: 0;
  position: relative;
}

.page-about .about-hero__fig img {
  width: 100%;
  aspect-ratio: 9 / 7;
  object-fit: cover;
  border: 1px solid var(--line-2);
  box-shadow: var(--shadow);
}

.page-about .about-hero__fig figcaption {
  margin-top: 8px;
  padding-left: 10px;
  border-left: 3px solid var(--yellow);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--graphite);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0 0 0;
  padding: 0;
  list-style: none;
  background: var(--ink);
  border: 1px solid var(--ink);
  color: var(--white);
}

.page-about .about-hero__stats li {
  padding: 16px 16px 14px;
  border-top: 1px solid var(--line-light);
  border-left: 1px solid var(--line-light);
}

.page-about .about-hero__stats li:nth-child(-n + 2) {
  border-top: 0;
}

.page-about .about-hero__stats li:nth-child(odd) {
  border-left: 0;
}

.page-about .about-hero__stats .stat-value {
  display: block;
  font-family: var(--mono);
  font-size: 1.5rem;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .about-hero__stats .stat-label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--mist-2);
}

/* 索引 + 长卷 */
.page-about .about-layout {
  display: grid;
  gap: 6px;
  padding: 26px 0 40px;
}

.page-about .about-index {
  border-top: 2px solid var(--jiang);
  padding-top: 12px;
}

.page-about .about-index__title {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--jiang);
}

.page-about .about-index__title--sub {
  margin-top: 16px;
  color: var(--graphite);
}

.page-about .about-index__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--ink);
  font-size: 12px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .about-index__list a .mono {
  font-size: 10px;
  color: var(--jiang);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  border-color: var(--jiang);
  background: var(--mist-2);
}

.page-about .about-index__list a:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: 2px;
}

.page-about .about-index__list--years a {
  font-family: var(--mono);
  letter-spacing: 0.06em;
}

/* 章节 */
.page-about .chapter {
  padding: 34px 0;
  border-top: 1px solid var(--line);
}

.page-about .chapter:first-child {
  border-top: 0;
  padding-top: 6px;
}

.page-about .chapter h2 {
  margin-top: 8px;
  font-size: clamp(1.45rem, 5vw, 2rem);
}

.page-about .chapter p {
  margin: 14px 0 0;
  font-size: 0.97rem;
  max-width: 38em;
}

.page-about .chapter--tint {
  background: var(--mist-2);
  border: 1px solid var(--line);
  padding: 26px 18px;
  margin: 10px 0;
}

.page-about .eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--graphite);
}

.page-about .eyebrow .num {
  display: inline-block;
  padding: 1px 6px;
  background: var(--ink);
  color: var(--yellow);
  font-size: 10px;
  letter-spacing: 0.1em;
}

.page-about .eyebrow--on-dark {
  color: var(--mist-2);
}

.page-about .eyebrow--on-dark .num {
  background: var(--yellow);
  color: var(--ink);
}

/* 章节配图 */
.page-about .chapter-figure {
  margin: 22px 0 0;
}

.page-about .chapter-figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--line-2);
  box-shadow: var(--shadow);
}

.page-about .chapter-figure--wide img {
  aspect-ratio: 3 / 2;
}

.page-about .chapter-figure figcaption {
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--graphite);
}

/* 比赛日时间轴 */
.page-about .matchday {
  position: relative;
  margin: 22px 0 0;
  padding: 0 0 0 4px;
  list-style: none;
}

.page-about .matchday::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 10px;
  width: 1px;
  background: var(--line-2);
}

.page-about .matchday > li {
  position: relative;
  padding: 0 0 22px 26px;
}

.page-about .matchday > li:last-child {
  padding-bottom: 0;
}

.page-about .matchday > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--mist);
  border: 2px solid var(--jiang);
  transition: background 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .matchday > li:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: 5px;
}

.page-about .matchday > li:focus-visible::before {
  background: var(--yellow);
  border-color: var(--orange);
}

.page-about .matchday__when {
  display: block;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .matchday__what {
  display: block;
  margin-top: 2px;
  font-family: var(--head);
  font-weight: 800;
  font-size: 1rem;
  color: var(--ink);
}

.page-about .matchday > li p {
  margin: 4px 0 0;
  font-size: 0.93rem;
}

/* 角色卡 */
.page-about .role-grid {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

.page-about .role {
  background: var(--white);
  border: 1px solid var(--line);
  border-top: 2px solid var(--jiang);
  padding: 16px;
  transition: transform 0.28s var(--ease), box-shadow 0.28s var(--ease), border-color 0.28s var(--ease);
}

.page-about .role:hover,
.page-about .role:focus {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
  border-color: var(--jiang);
}

.page-about .role:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: 2px;
}

.page-about .role__count {
  display: block;
  font-family: var(--mono);
  font-size: 1.5rem;
  line-height: 1;
  color: var(--jiang);
  font-variant-numeric: tabular-nums;
}

.page-about .role__name {
  margin: 6px 0 4px;
  font-size: 1rem;
}

.page-about .role__desc,
.page-about .role__more {
  margin: 0;
  font-size: 0.9rem;
  max-width: none;
}

.page-about .role__more {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--line-2);
  font-size: 0.85rem;
  color: var(--graphite);
}

/* 版本时间线 */
.page-about .versions {
  margin-top: 20px;
  padding-left: 18px;
  border-left: 1px solid var(--line-2);
}

.page-about .version {
  position: relative;
  padding: 18px 0;
  border-bottom: 1px dashed var(--line);
}

.page-about .version:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .version::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 26px;
  width: 9px;
  height: 9px;
  background: var(--mist);
  border: 2px solid var(--orange);
  transform: rotate(45deg);
}

.page-about .version__title {
  font-size: 1.02rem;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
}

.page-about .version__year {
  font-size: 1.3rem;
  letter-spacing: 0.02em;
  color: var(--jiang);
  border-bottom: 2px solid var(--yellow);
}

.page-about .version p {
  margin: 8px 0 0;
  font-size: 0.93rem;
  max-width: 40em;
}

/* 合作节点 */
.page-about .eco {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 22px;
}

.page-about .eco__node {
  position: relative;
  background: var(--white);
  border: 1px solid var(--line);
  padding: 14px 14px 12px;
  overflow: hidden;
}

.page-about .eco__node::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 12px;
  height: 12px;
  background: var(--violet);
}

.page-about .eco__num {
  display: block;
  font-size: 1.1rem;
  letter-spacing: 0.04em;
  color: var(--ink);
}

.page-about .eco__label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: var(--graphite);
}

/* 行动区 */
.page-about .about-cta {
  background: var(--ink);
  color: var(--mist-2);
  padding: 34px 0 42px;
  border-top: 3px solid var(--jiang);
}

.page-about .about-cta h2 {
  margin-top: 10px;
  color: var(--white);
  font-size: clamp(1.45rem, 5vw, 2rem);
}

.page-about .about-cta__lead {
  margin: 12px 0 0;
  font-size: 0.95rem;
  max-width: 40em;
  color: var(--mist-2);
}

.page-about .cta-grid {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

.page-about .cta-link {
  display: block;
  padding: 15px 16px;
  border: 1px solid var(--line-light-2);
  background: rgba(255, 255, 255, 0.02);
  color: var(--white);
  text-decoration: none;
  transition: border-color 0.24s var(--ease), background 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .cta-link:hover,
.page-about .cta-link:focus-visible {
  border-color: var(--cyan);
  background: rgba(23, 195, 178, 0.1);
  transform: translateY(-2px);
}

.page-about .cta-link:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: 2px;
}

.page-about .cta-link__k {
  display: block;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--yellow);
}

.page-about .cta-link__t {
  display: block;
  margin-top: 5px;
  font-size: 0.94rem;
  line-height: 1.6;
}

@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero__stats li:nth-child(-n + 2) {
    border-top: 0;
  }

  .page-about .about-hero__stats li:nth-child(odd) {
    border-left: 1px solid var(--line-light);
  }

  .page-about .about-hero__stats li:first-child {
    border-left: 0;
  }

  .page-about .about-hero__stats .stat-value {
    font-size: 1.75rem;
  }

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

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

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

  .page-about .chapter--tint {
    padding: 30px 26px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: end;
    gap: 48px;
    padding: 28px 0 40px;
  }

  .page-about .about-hero__text {
    padding-left: 24px;
  }

  .page-about .about-hero__lead {
    font-size: 1.06rem;
  }

  .page-about .about-layout {
    grid-template-columns: 212px minmax(0, 1fr);
    gap: 56px;
    padding: 34px 0 56px;
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 92px;
  }

  .page-about .about-index__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__list li + li {
    margin-top: 2px;
  }

  .page-about .about-index__list a {
    display: flex;
    padding: 5px 0 5px 12px;
    border: 0;
    border-left: 1px solid var(--line-2);
    background: transparent;
    font-size: 13px;
    white-space: normal;
    transition: border-color 0.24s var(--ease), color 0.24s var(--ease), padding 0.24s var(--ease);
  }

  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible {
    border-left-color: var(--jiang);
    background: transparent;
    color: var(--jiang-deep);
    padding-left: 16px;
  }

  .page-about .chapter {
    padding: 44px 0;
  }

  .page-about .chapter:first-child {
    padding-top: 4px;
  }

  .page-about .chapter p {
    font-size: 1rem;
  }

  .page-about .chapter--tint {
    padding: 36px 34px;
    margin: 12px 0;
  }

  .page-about .matchday {
    margin-top: 26px;
  }

  .page-about .matchday > li {
    padding-left: 32px;
    padding-bottom: 26px;
  }

  .page-about .matchday > li::before {
    left: 0;
    top: 7px;
    width: 12px;
    height: 12px;
  }

  .page-about .chapter-figure--wide img {
    aspect-ratio: 16 / 9;
  }

  .page-about .about-cta {
    padding: 46px 0 56px;
  }
}

@media (min-width: 900px) and (hover: hover) {
  .page-about .role__more {
    max-height: 0;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
    overflow: hidden;
    transition: max-height 0.32s var(--ease), margin 0.32s var(--ease), padding 0.32s var(--ease);
  }

  .page-about .role:hover .role__more,
  .page-about .role:focus .role__more,
  .page-about .role:focus-within .role__more {
    max-height: 220px;
    margin-top: 10px;
    padding-top: 10px;
    border-top-color: var(--line-2);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role,
  .page-about .cta-link,
  .page-about .about-index__list a,
  .page-about .matchday > li::before,
  .page-about .role__more {
    transition: none;
  }

  .page-about .role:hover,
  .page-about .cta-link:hover {
    transform: none;
  }
}
<<<END>>>