.page-about .about-hero {
  padding: 34px 0 30px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero .eyebrow {
  margin: 0 0 10px;
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-size: clamp(30px, 8vw, 54px);
  line-height: 1.12;
  font-weight: 900;
  letter-spacing: -0.01em;
  max-width: 16em;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero__facts li {
  background: rgba(18, 58, 52, 0.52);
  padding: 14px 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted-2);
}

.page-about .about-hero__facts .num {
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  font-weight: 700;
  color: var(--neon);
}

/* ---------- 时间轴 + 内容轨道 ---------- */

.page-about .about-track {
  padding: 44px 0 12px;
}

.page-about .about-track__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-about .track-rail {
  padding: 16px 16px 18px;
  border: 1px solid var(--line);
  background: rgba(11, 27, 43, 0.72);
}

.page-about .track-rail__title {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted-2);
  text-transform: uppercase;
}

.page-about .track-list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .track-list::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--kiwi), var(--electric));
  opacity: 0.85;
}

.page-about .track-node {
  position: relative;
  padding: 0 0 20px 22px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .track-node:last-child {
  padding-bottom: 0;
}

.page-about .track-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--kiwi);
  box-shadow: 0 0 0 3px rgba(11, 27, 43, 0.95);
}

.page-about .track-node strong {
  display: block;
  font-weight: 800;
  font-size: 13px;
  color: var(--text);
  letter-spacing: 0.01em;
}

.page-about .track-node span {
  display: block;
  color: var(--muted-2);
  margin-top: 2px;
}

.page-about .track-node__more {
  display: block;
  margin-top: 8px;
  font-style: normal;
  font-size: 12px;
  line-height: 1.7;
  color: var(--electric);
  border-left: 2px solid rgba(53, 208, 255, 0.4);
  padding-left: 10px;
}

.page-about .track-body {
  display: flex;
  flex-direction: column;
  gap: 34px;
  min-width: 0;
}

/* ---------- 通用区块 ---------- */

.page-about .about-block {
  padding: 26px 18px 22px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  min-width: 0;
}

.page-about .about-block--teal {
  background: rgba(18, 58, 52, 0.78);
}

.page-about .about-block--deep {
  background: rgba(11, 27, 43, 0.86);
}

.page-about .about-block--wine {
  background: rgba(110, 31, 60, 0.62);
}

.page-about .about-block--indigo {
  background: rgba(46, 35, 89, 0.7);
}

.page-about .about-block--bark {
  background: rgba(110, 74, 36, 0.5);
}

.page-about .about-block__head {
  margin-bottom: 20px;
}

.page-about .about-block__head .eyebrow {
  margin: 0 0 8px;
}

.page-about .about-block h2 {
  margin: 0;
  font-size: clamp(22px, 5.4vw, 32px);
  line-height: 1.24;
  font-weight: 900;
  letter-spacing: -0.005em;
  max-width: 20em;
}

.page-about .about-block__lead {
  margin: 12px 0 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-block__note {
  margin: 20px 0 0;
  padding: 12px 14px;
  border-left: 2px solid var(--neon);
  background: rgba(11, 27, 43, 0.42);
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-block .prose {
  max-width: 38em;
}

.page-about .about-block .prose p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
}

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

/* ---------- 延伸入口 ---------- */

.page-about .exit-link {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 12px;
  margin-top: 22px;
  padding: 13px 14px;
  border: 1px solid var(--line-strong);
  background: rgba(11, 27, 43, 0.5);
  text-decoration: none;
  color: var(--text);
  font-size: 14px;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .exit-link:hover,
.page-about .exit-link:focus-visible {
  border-color: var(--neon);
  background: rgba(217, 255, 63, 0.08);
  transform: translateY(-2px);
}

.page-about .exit-link__label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink);
  background: var(--kiwi);
  padding: 3px 8px;
  border-radius: 999px;
  font-weight: 700;
}

.page-about .exit-link__text {
  flex: 1 1 12em;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .exit-link__arrow {
  font-family: var(--font-mono);
  color: var(--neon);
  font-size: 16px;
}

/* ---------- 发展脉络 ---------- */

.page-about .stage-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .stage-split__media {
  margin: 0;
}

/* ---------- 覆盖范围 ---------- */

.page-about .league-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-about .league-chips .chip {
  cursor: pointer;
}

.page-about .league-table {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
}

.page-about .league-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 56px;
  gap: 6px 12px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  transition: background-color var(--dur) var(--ease);
}

.page-about .league-row:last-child {
  border-bottom: 0;
}

.page-about .league-row:hover {
  background: rgba(134, 194, 50, 0.09);
}

.page-about .league-row--head {
  display: none;
}

.page-about .league-row__cat {
  font-weight: 800;
  color: var(--text);
  font-size: 14px;
}

.page-about .league-row__n {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--neon);
  line-height: 1.3;
  text-align: right;
}

.page-about .league-row span:nth-child(3),
.page-about .league-row span:nth-child(4) {
  grid-column: 1 / -1;
  font-size: 13px;
}

.page-about .league-row span:nth-child(3)::before {
  content: "赛事 · ";
  color: var(--muted-2);
}

.page-about .league-row span:nth-child(4)::before {
  content: "节奏 · ";
  color: var(--muted-2);
}

.page-about .about-block .media-frame--wide {
  margin: 20px 0 0;
}

.page-about .media-frame__cap {
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted-2);
}

/* ---------- 数据来源 ---------- */

.page-about .source-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .source-split__aside {
  padding: 16px 14px;
  border: 1px solid var(--line-strong);
  background: rgba(11, 27, 43, 0.56);
}

.page-about .note-aside__title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--neon);
}

.page-about .source-stats {
  margin: 0;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 9px 14px;
  font-size: 13px;
  line-height: 1.6;
}

.page-about .source-stats dt {
  color: var(--muted-2);
}

.page-about .source-stats dd {
  margin: 0;
  color: var(--text);
  font-weight: 700;
}

.page-about .source-stats .num {
  font-family: var(--font-mono);
  color: var(--electric);
  font-size: 15px;
}

/* ---------- 更新节奏 ---------- */

.page-about .rhythm-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .rhythm-card {
  background: rgba(11, 27, 43, 0.66);
  padding: 18px 16px 20px;
}

.page-about .rhythm-card__time {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1;
  font-weight: 700;
  color: var(--orange);
}

.page-about .rhythm-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 800;
  color: var(--text);
}

.page-about .rhythm-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 团队 ---------- */

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

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-strong);
  border: 1px solid var(--line-strong);
}

.page-about .team-card {
  background: rgba(11, 27, 43, 0.72);
  padding: 16px 15px 18px;
  position: relative;
  transition: background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  background: rgba(134, 194, 50, 0.1);
  transform: translateY(-2px);
}

.page-about .team-card__n {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  font-weight: 700;
  color: var(--kiwi);
}

.page-about .team-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 800;
  color: var(--text);
}

.page-about .team-card__duty {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .team-card__hover {
  margin: 10px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line-strong);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--electric);
}

.page-about .team-layout__media {
  margin: 0;
}

/* ---------- 闭环 ---------- */

.page-about .loop-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .loop-step {
  padding-left: 16px;
  border-left: 2px solid var(--wine);
}

.page-about .loop-step__idx {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  font-weight: 700;
  color: var(--kiwi);
}

.page-about .loop-step h3 {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 800;
  color: var(--text);
}

.page-about .loop-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 媒体框尺寸约束 ---------- */

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

.page-about .media-frame--tall img {
  aspect-ratio: 4 / 3;
}

.page-about .media-frame--wide img {
  aspect-ratio: 3 / 2;
}

.page-about .media-frame--square img {
  aspect-ratio: 10 / 7;
}

/* ---------- 平板 ---------- */

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

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

  .page-about .league-row {
    grid-template-columns: 110px 64px minmax(0, 1fr);
    align-items: baseline;
  }

  .page-about .league-row--head {
    display: grid;
    background: rgba(242, 247, 238, 0.05);
    font-size: 12px;
    letter-spacing: 0.08em;
    color: var(--muted-2);
    font-weight: 700;
  }

  .page-about .league-row--head span {
    grid-column: auto;
  }

  .page-about .league-row--head span:nth-child(3) {
    grid-column: 3 / -1;
  }

  .page-about .league-row--head span:nth-child(4) {
    display: none;
  }

  .page-about .league-row__n {
    text-align: left;
  }

  .page-about .league-row span:nth-child(3),
  .page-about .league-row span:nth-child(4) {
    grid-column: auto;
    font-size: 13px;
  }

  .page-about .league-row span:nth-child(3),
  .page-about .league-row span:nth-child(4) {
    grid-column: 3 / -1;
  }

  .page-about .league-row span:nth-child(3) {
    grid-column: 3 / -1;
  }

  .page-about .league-row span:nth-child(4) {
    grid-column: 3 / -1;
    color: var(--muted-2);
  }

  .page-about .league-row span:nth-child(3)::before,
  .page-about .league-row span:nth-child(4)::before {
    content: none;
  }

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

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

  .page-about .loop-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 22px;
  }

  .page-about .stage-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 26px;
    align-items: start;
  }
}

/* ---------- 桌面 ---------- */

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 46px 0 40px;
  }

  .page-about .about-track {
    padding: 56px 0 20px;
  }

  .page-about .about-track__grid {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 46px;
    align-items: start;
  }

  .page-about .track-rail {
    position: sticky;
    top: calc(var(--topbar-h) + 20px);
    padding: 20px 18px 22px;
  }

  .page-about .track-node__more {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    overflow: hidden;
    transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease), margin-top var(--dur) var(--ease);
  }

  .page-about .track-node:hover .track-node__more,
  .page-about .track-node:focus-within .track-node__more {
    max-height: 90px;
    opacity: 1;
    margin-top: 8px;
  }

  .page-about .track-body {
    gap: 46px;
  }

  .page-about .about-block {
    padding: 38px 34px 32px;
  }

  .page-about .source-split {
    grid-template-columns: minmax(0, 1fr) 268px;
    gap: 28px;
    align-items: start;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    gap: 26px;
    align-items: start;
  }

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

  .page-about .loop-steps {
    gap: 20px 30px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-track__grid {
    grid-template-columns: 262px minmax(0, 1fr);
    gap: 58px;
  }
}
<<<END>>>