.page-about {
  background: var(--ink);
  color: var(--chalk);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .about-top {
  padding-top: calc(var(--gap) * 3);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--sage);
}

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

.page-about .breadcrumb a {
  color: var(--sage);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: clamp(28px, 5vw, 56px);
  padding-bottom: clamp(40px, 7vw, 80px);
  border-bottom: var(--edge) solid var(--line);
  background-image: repeating-linear-gradient(
    90deg,
    var(--grid-line) 0 1px,
    transparent 1px var(--grid-cell)
  );
}

.page-about .about-hero .kicker {
  color: var(--lime);
  margin-bottom: 16px;
}

.page-about .about-hero .h-hero {
  color: var(--chalk);
  margin: 0 0 24px;
  line-height: 0.95;
}

.page-about .about-hero__lead {
  max-width: 36em;
  margin: 0;
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.8;
  color: var(--chalk);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin: 28px 0 0;
  padding: 14px 0 0;
  list-style: none;
  border-top: 3px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--sage);
}

.page-about .about-hero__meta li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-hero__meta li::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--orange);
}

/* ---------- 主体布局 ---------- */

.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: calc(var(--breath) * 0.5);
  padding-top: var(--breath);
  padding-bottom: var(--breath);
}

.page-about .season-rail {
  border-top: var(--edge) solid var(--line);
  padding-top: 14px;
}

.page-about .season-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--sage);
}

.page-about .season-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 3px solid var(--line);
  padding-left: 14px;
}

.page-about .season-rail__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 4px 0;
  color: var(--sage);
  text-decoration: none;
  font-size: 15px;
  border-bottom: 2px solid transparent;
}

.page-about .season-rail__list .mono {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--orange);
  letter-spacing: 0.06em;
}

.page-about .season-rail__list a:hover,
.page-about .season-rail__list a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .about-body {
  min-width: 0;
}

/* ---------- 章节 ---------- */

.page-about .about-sec {
  scroll-margin-top: 96px;
}

.page-about .about-sec + .about-sec {
  margin-top: calc(var(--breath) * 0.9);
}

.page-about .about-sec__head {
  border-top: var(--edge) solid var(--line);
  padding-top: 16px;
  margin-bottom: 26px;
}

.page-about .about-sec__head .kicker {
  color: var(--orange);
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
}

.page-about .about-sec__head .h-section {
  margin: 0;
  color: var(--chalk);
}

.page-about .about-body p {
  max-width: 36em;
  margin: 0 0 18px;
  font-size: 17px;
  line-height: 1.78;
  color: var(--chalk);
}

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

.page-about .about-body a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 2px solid var(--line);
}

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

/* ---------- 数字 ---------- */

.page-about .stat-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 32px 0;
  border-top: var(--edge) solid var(--line);
  border-bottom: var(--edge) solid var(--line);
}

.page-about .stat-row .stat {
  padding: 20px 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .stat-row .stat + .stat {
  border-top: 3px solid var(--line);
}

.page-about .stat-row .stat__num {
  font-family: var(--font-mono);
  font-size: clamp(2.6rem, 8vw, 4.2rem);
  line-height: 0.9;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  color: var(--chalk);
}

.page-about .stat-row .stat__num--lime {
  color: var(--lime);
}

.page-about .stat-row .stat__num--orange {
  color: var(--orange);
}

.page-about .stat-row .stat__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--sage);
  max-width: 20em;
}

/* ---------- 城市折叠 ---------- */

.page-about .city-fold {
  border: 3px solid var(--line);
  background: var(--charcoal);
}

.page-about .city-fold summary {
  cursor: pointer;
  list-style: none;
  padding: 16px 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--lime);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.page-about .city-fold summary::-webkit-details-marker {
  display: none;
}

.page-about .city-fold summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--sage);
}

.page-about .city-fold[open] summary::after {
  content: "–";
  color: var(--lime);
}

.page-about .city-fold__list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(88px, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border-top: 3px solid var(--line);
}

.page-about .city-fold__list li {
  background: var(--charcoal);
  padding: 12px 14px;
  font-size: 14px;
  color: var(--chalk);
}

/* ---------- 团队 ---------- */

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3px;
  margin: 28px 0 0;
  background: var(--line);
  border: var(--edge) solid var(--line);
}

.page-about .team-card {
  position: relative;
  background: var(--charcoal);
  padding: 22px 20px 24px;
}

.page-about .team-card__tag {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .team-card__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.6vw, 1.7rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--chalk);
}

.page-about .team-card__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--sage);
  max-width: none;
}

.page-about .team-card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 18px;
  height: 4px;
  background: var(--orange);
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 32px 0 0;
  border: var(--edge) solid var(--line);
  background: var(--charcoal);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-figure--tall {
  margin-top: 24px;
}

.page-about .about-figure--tall img {
  aspect-ratio: 5 / 6;
}

.page-about .about-figure__caption {
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--sage);
  border-top: 3px solid var(--line);
}

/* ---------- 数据来源 ---------- */

.page-about .source-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.page-about .flow-svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 520px;
  margin: 8px 0 24px;
}

.page-about .flow-line {
  fill: none;
  stroke-width: 3;
  stroke-linecap: square;
}

.page-about .flow-line--a {
  stroke: var(--lime);
}

.page-about .flow-line--b {
  stroke: var(--orange);
}

.page-about .flow-line--c {
  stroke: var(--sage);
}

.page-about .flow-out {
  stroke: var(--chalk);
}

.page-about .flow-dot {
  fill: var(--lime);
}

.page-about .flow-tip {
  fill: var(--chalk);
}

.page-about .source-list {
  margin: 24px 0;
  padding: 0;
  list-style: none;
  border-top: 3px solid var(--line);
}

.page-about .source-list li {
  padding: 18px 0;
  border-bottom: 3px solid var(--line);
}

.page-about .source-list h3 {
  margin: 0 0 8px;
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 700;
  color: var(--lime);
  letter-spacing: 0.01em;
}

.page-about .source-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--sage);
  max-width: 34em;
}

/* ---------- 城市网格 ---------- */

.page-about .city-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 3px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: var(--edge) solid var(--line);
}

.page-about .city-chip {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--charcoal);
  transition: background 160ms linear;
}

.page-about .city-chip__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--chalk);
}

.page-about .city-chip__num {
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .city-chip__num span {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--sage);
  margin-left: 4px;
}

.page-about .city-chip__time {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--sage);
}

.page-about .city-chip:hover,
.page-about .city-chip:focus-within {
  background: var(--turf);
}

.page-about .city-chip:hover .city-chip__num,
.page-about .city-chip:focus-within .city-chip__num {
  color: var(--lime);
}

/* ---------- 赛季节奏 ---------- */

.page-about .beat-list {
  margin: 28px 0 0;
  padding: 0 0 0 22px;
  list-style: none;
  border-left: var(--edge) solid var(--line);
}

.page-about .beat-list li {
  position: relative;
  padding-bottom: 26px;
}

.page-about .beat-list li:last-child {
  padding-bottom: 0;
}

.page-about .beat-list li::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--orange);
}

.page-about .beat-list .beat-list__item--end::before {
  background: var(--lime);
}

.page-about .beat-list__time {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--lime);
  max-width: none;
}

.page-about .beat-list h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--chalk);
}

.page-about .beat-list li p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--sage);
  max-width: 32em;
}

/* ---------- 行动区 ---------- */

.page-about .about-cta {
  margin-top: 36px;
  padding-top: 26px;
  border-top: var(--edge) solid var(--lime);
}

.page-about .about-cta__title {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--sage);
  max-width: none;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
}

.page-about .cta-link {
  flex: 1 1 180px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  border: 3px solid var(--line);
  background: var(--charcoal);
  color: var(--chalk);
  text-decoration: none;
  font-size: 15px;
  border-bottom-width: 3px;
  transition: background 160ms linear, border-color 160ms linear, color 160ms linear;
}

.page-about .cta-link span {
  font-family: var(--font-mono);
  color: var(--orange);
}

.page-about .cta-link:hover,
.page-about .cta-link:focus-visible {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink);
}

.page-about .cta-link:hover span,
.page-about .cta-link:focus-visible span {
  color: var(--ink);
}

/* ---------- 桌面栅格 ---------- */

@media (min-width: 900px) {
  .page-about .about-layout {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

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

  .page-about .season-rail__list {
    flex-direction: column;
    gap: 2px;
    border-left: var(--edge) solid var(--line);
  }

  .page-about .season-rail__list a {
    padding: 5px 0;
  }

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

  .page-about .stat-row .stat {
    padding: 26px 0 26px 20px;
  }

  .page-about .stat-row .stat:first-child {
    padding-left: 0;
  }

  .page-about .stat-row .stat + .stat {
    border-top: 0;
    border-left: 3px solid var(--line);
  }

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

  .page-about .source-split {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: clamp(24px, 3vw, 44px);
    align-items: start;
  }

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

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

  .page-about .about-figure--tall img {
    aspect-ratio: 5 / 6;
  }

  .page-about .about-sec__head {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .city-chip,
  .page-about .cta-link {
    transition: none;
  }
}
<<<END>>>