.page-about {
  background: var(--snow);
  color: var(--ink);
}

.page-about .about-shell {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 20px 72px;
}

/* ---------- 左侧章节栏 ---------- */

.page-about .about-rail {
  display: none;
}

.page-about .rail-note {
  margin: 0 0 20px 16px;
  font-size: 12px;
  letter-spacing: 0.3em;
  font-weight: 300;
  color: var(--rock);
  writing-mode: vertical-rl;
  line-height: 1.2;
}

.page-about .rail-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--line);
}

.page-about .rail-link {
  display: block;
  margin-left: -1px;
  padding: 10px 0 10px 16px;
  border-left: 2px solid transparent;
  text-decoration: none;
  transition: border-color var(--dur) var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  border-left-color: var(--flag-red);
}

.page-about .rail-num {
  display: block;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--flag-red);
}

.page-about .rail-label {
  display: block;
  margin-top: 2px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--rock);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: 24px 0 36px;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-hero__title {
  margin: 12px 0 18px;
  font-size: clamp(30px, 6.4vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--blue-deep);
}

.page-about .about-hero__lead {
  max-width: 58ch;
  margin: 0 0 28px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

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

.page-about .about-stat {
  background: var(--white);
  padding: 16px 14px 18px;
}

.page-about .about-stat__value {
  display: block;
  font-family: var(--font-num);
  font-size: 28px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--blue-deep);
}

.page-about .about-stat--accent .about-stat__value {
  color: var(--flag-red);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--rock);
}

/* ---------- 章节通用 ---------- */

.page-about .about-section {
  padding: 42px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-section:last-of-type {
  border-bottom: 0;
  padding-bottom: 20px;
}

.page-about .about-h2 {
  margin: 0 0 12px;
  font-size: clamp(22px, 4.4vw, 30px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  font-weight: 900;
  color: var(--blue-deep);
}

.page-about .about-lead {
  max-width: 62ch;
  margin: 0 0 20px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--rock);
}

.page-about .about-p {
  max-width: 64ch;
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-split {
  display: grid;
  gap: 24px;
}

.page-about .about-figure {
  margin: 0;
  padding: 8px;
  border: 1px solid var(--line);
  background: var(--white);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--blue-pale);
}

.page-about .about-figure figcaption {
  padding: 8px 2px 2px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.1em;
  color: var(--rock);
}

.page-about .about-figure--inset {
  max-width: 560px;
  margin-top: 28px;
}

/* ---------- 三道工序 ---------- */

.page-about .process {
  display: grid;
  gap: 14px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .process__step {
  position: relative;
  padding: 22px 18px 20px;
  background: var(--white);
  border: 1px solid var(--line);
  transition: opacity var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .process__step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--flag-yellow);
}

.page-about .process__step:nth-child(1)::before {
  background: var(--flag-red);
}

.page-about .process__step:nth-child(2)::before {
  background: var(--flag-yellow);
}

.page-about .process__step:nth-child(3)::before {
  background: var(--flag-green);
}

.page-about .process__num {
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--rock);
}

.page-about .process__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--blue-deep);
}

.page-about .process__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink);
}

/* ---------- 团队 ---------- */

.page-about .team-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team-card {
  background: var(--white);
  padding: 20px 16px 22px;
}

.page-about .team-card--lead {
  background: var(--blue-deep);
}

.page-about .team-card__role {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--rock);
}

.page-about .team-card__num {
  margin: 10px 0 8px;
  font-family: var(--font-num);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--blue-deep);
}

.page-about .team-card__text {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--rock);
}

.page-about .team-card--lead .team-card__role {
  color: var(--blue-pale);
}

.page-about .team-card--lead .team-card__num {
  color: var(--white);
}

.page-about .team-card--lead .team-card__text {
  color: rgba(255, 255, 255, 0.78);
}

/* ---------- 发展节点 ---------- */

.page-about .track {
  margin-top: 26px;
  padding-bottom: 10px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .track__list {
  position: relative;
  display: flex;
  margin: 0;
  padding: 0;
  list-style: none;
  min-width: min-content;
}

.page-about .track__list::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--line);
}

.page-about .track__node {
  position: relative;
  flex: 0 0 auto;
  width: 268px;
  padding: 28px 22px 22px 18px;
  scroll-snap-align: start;
  transition: background var(--dur) var(--ease);
}

.page-about .track__node::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--snow);
  border: 1px solid var(--blue-deep);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .track__node::after {
  content: "";
  position: absolute;
  top: 8px;
  left: 0;
  width: 2px;
  height: 0;
  background: var(--flag-red);
  transition: height var(--dur) var(--ease);
}

.page-about .track__node:hover::before,
.page-about .track__node:focus-within::before {
  background: var(--flag-red);
  border-color: var(--flag-red);
}

.page-about .track__node:hover::after,
.page-about .track__node:focus-within::after {
  height: calc(100% - 8px);
}

.page-about .track__tag {
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--flag-red);
}

.page-about .track__title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--blue-deep);
}

.page-about .track__text {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--rock);
}

/* ---------- 项目与读者 ---------- */

.page-about .coverage {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

.page-about .coverage__card {
  border: 1px solid var(--line);
  background: var(--white);
  padding: 20px 18px 22px;
}

.page-about .sport-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .sport-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 12px;
  background: var(--white);
  font-size: 14px;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .sport-list li::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  background: var(--flag-yellow);
}

.page-about .sport-list li:nth-child(1)::before {
  background: var(--flag-red);
}

.page-about .sport-list li:nth-child(2)::before {
  background: var(--flag-yellow);
}

.page-about .sport-list li:nth-child(3)::before {
  background: var(--flag-green);
}

.page-about .sport-list li:nth-child(4)::before {
  background: var(--blue-sky);
}

.page-about .sport-list li:nth-child(5)::before {
  background: var(--blue-deep);
}

.page-about .sport-list li:nth-child(6)::before {
  background: var(--rock);
}

.page-about .coverage__note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--rock);
}

.page-about .region {
  border: 1px solid var(--line);
  background: var(--white);
  padding: 22px 18px 24px;
}

.page-about .region__value {
  margin: 0;
  font-family: var(--font-num);
  font-size: 52px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--blue-deep);
}

.page-about .region__label {
  margin: 10px 0 20px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--rock);
}

.page-about .region__track {
  height: 6px;
  background: var(--line-soft);
  overflow: hidden;
}

.page-about .region__fill {
  display: block;
  width: 60%;
  height: 100%;
  background: var(--blue-sky);
}

.page-about .region__cities {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--ink);
}

.page-about .region__cities li {
  padding-bottom: 2px;
  border-bottom: 1px solid var(--line);
}

/* ---------- 协作 ---------- */

.page-about .about-inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin: 20px 0 0;
}

.page-about .about-inline-links a {
  font-size: 14px;
  font-weight: 600;
  color: var(--blue-sky);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 3px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-inline-links a:hover,
.page-about .about-inline-links a:focus-visible {
  color: var(--flag-red);
  border-color: var(--flag-red);
}

/* ---------- 行动条 ---------- */

.page-about .about-cta {
  display: grid;
  gap: 18px;
  margin-top: 36px;
  padding: 26px 20px;
  background: var(--white);
  border: 1px solid var(--blue-deep);
}

.page-about .about-cta__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 900;
  line-height: 1.4;
  color: var(--blue-deep);
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 13px;
  line-height: 1.78;
  color: var(--rock);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 媒体查询 ---------- */

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 24px;
    padding: 26px 24px;
  }
}

@media (min-width: 780px) {
  .page-about .process {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .coverage {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 20px;
    align-items: start;
  }

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

@media (hover: hover) and (min-width: 780px) {
  .page-about .process:hover .process__step {
    opacity: 0.55;
  }

  .page-about .process:hover .process__step:hover {
    opacity: 1;
    border-color: var(--blue-sky);
  }
}

@media (min-width: 880px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-split--flip {
    grid-template-columns: minmax(0, 0.98fr) minmax(0, 1.02fr);
  }

  .page-about .about-split--flip .about-figure {
    order: -1;
  }

  .page-about .about-figure--inset {
    margin-left: auto;
    margin-right: auto;
  }
}

@media (min-width: 960px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 52px;
    align-items: start;
    padding: 0 24px 88px;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 96px;
    align-self: start;
    padding-top: 40px;
  }

  .page-about .about-hero {
    padding-top: 28px;
  }

  .page-about .about-section {
    padding: 52px 0;
  }

  .page-about .track__node {
    width: 300px;
  }
}

@media (min-width: 1120px) {
  .page-about .about-hero__lead {
    font-size: 16px;
  }

  .page-about .about-p {
    font-size: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rail-link,
  .page-about .process__step,
  .page-about .track__node,
  .page-about .track__node::before,
  .page-about .track__node::after,
  .page-about .about-inline-links a {
    transition: none;
  }
}
<<<END>>>