.page-about {
  --about-h1: clamp(2rem, 5.4vw, 4.2rem);
  --about-gap: clamp(1.25rem, 3vw, 2.25rem);
}

.page-about .about-crumbs {
  padding-top: clamp(1.1rem, 3vw, 1.9rem);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(1.75rem, 5vw, 3.25rem) 0 clamp(2.5rem, 7vw, 5rem);
  overflow: hidden;
}

.page-about .about-hero-slash {
  position: absolute;
  top: 0;
  right: -6%;
  width: 58%;
  height: 100%;
  background: linear-gradient(180deg, rgba(31, 138, 91, 0.22), rgba(7, 23, 18, 0) 72%);
  clip-path: polygon(28% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: end;
}

.page-about .about-hero-copy {
  max-width: 34ch;
}

.page-about .about-hero-copy h1 {
  font-size: var(--about-h1);
  line-height: 1.08;
  letter-spacing: -0.015em;
  margin: 0.45rem 0 0;
  font-weight: 900;
}

.page-about .about-hero-lead {
  margin-top: clamp(1rem, 2.5vw, 1.5rem);
  max-width: 46ch;
  color: var(--text-dim);
  line-height: 1.85;
}

.page-about .about-hero-meta {
  margin-top: clamp(1.5rem, 3.5vw, 2.25rem);
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 0;
  border-top: 1px solid var(--line);
  padding-top: 1.1rem;
}

.page-about .meta-cell {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding-right: clamp(1rem, 3vw, 2.25rem);
  margin-right: clamp(1rem, 3vw, 2.25rem);
  border-right: 1px solid var(--line);
}

.page-about .meta-cell:last-child {
  border-right: 0;
  margin-right: 0;
  padding-right: 0;
}

.page-about .meta-num {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--lime);
  line-height: 1.1;
}

.page-about .meta-label {
  font-size: var(--step-micro);
  color: var(--text-dim);
  letter-spacing: 0.04em;
}

.page-about .about-hero-figure {
  margin: 0;
}

.page-about .media-frame img,
.page-about .media-frame {
  max-width: 100%;
}

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

/* ---------- 主体两栏 ---------- */

.page-about .about-layout {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

.page-about .about-rail {
  align-self: start;
}

.page-about .rail-title {
  font-size: var(--step-micro);
  letter-spacing: 0.22em;
  color: var(--cyan);
  margin: 0 0 0.85rem;
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.page-about .rail-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.42rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text-dim);
  text-decoration: none;
  font-size: var(--step-small);
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about .rail-list a:hover,
.page-about .rail-list a:focus-visible {
  color: var(--white);
  border-color: var(--line-lime);
  background: rgba(183, 255, 74, 0.06);
}

.page-about .rail-no {
  color: var(--lime);
  font-size: var(--step-micro);
  font-weight: 700;
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(2.75rem, 7vw, 5.5rem);
  min-width: 0;
}

/* ---------- 章节 ---------- */

.page-about .about-chapter {
  position: relative;
  padding-top: clamp(1.25rem, 3vw, 2rem);
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 1.5rem);
}

.page-about .chapter-head {
  display: flex;
  align-items: baseline;
  gap: clamp(0.75rem, 2vw, 1.5rem);
  flex-wrap: wrap;
}

.page-about .chapter-index {
  font-size: clamp(2.6rem, 7vw, 5rem);
  line-height: 0.85;
  font-weight: 700;
  color: rgba(201, 210, 204, 0.22);
  transition: color 0.4s var(--ease);
}

.page-about .about-chapter.is-active .chapter-index {
  color: var(--lime);
}

.page-about .chapter-head .section-title {
  margin: 0;
}

.page-about .about-chapter-body {
  margin-top: clamp(1rem, 2.5vw, 1.6rem);
  display: flex;
  flex-direction: column;
  gap: 0.95rem;
  max-width: 68ch;
}

.page-about .about-chapter-body p {
  margin: 0;
  color: var(--text-dim);
  line-height: 1.85;
}

.page-about .about-link-line {
  margin: clamp(1.4rem, 3vw, 2rem) 0 0;
  max-width: 68ch;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-link-line a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(45, 212, 191, 0.4);
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}

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

/* ---------- 数据行 ---------- */

.page-about .about-fact-row {
  margin-top: clamp(1.5rem, 3.5vw, 2.25rem);
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .fact {
  background: var(--bg-raise);
  padding: clamp(1rem, 3vw, 1.5rem);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.page-about .fact-num {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1;
}

.page-about .fact-plus {
  color: var(--lime);
  margin-left: 0.1em;
}

.page-about .fact-label {
  font-size: var(--step-small);
  color: var(--text-dim);
}

/* ---------- 坐标卡 ---------- */

.page-about .coordinate-cards {
  margin-top: clamp(1.5rem, 3.5vw, 2.25rem);
  display: grid;
  gap: clamp(0.85rem, 2vw, 1.25rem);
}

.page-about .coord-card {
  position: relative;
  padding: clamp(1.1rem, 3vw, 1.6rem);
  background: var(--bg-raise);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .coord-card::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 34px;
  height: 2px;
  background: var(--turf);
  transition: width 0.35s var(--ease), background-color 0.35s var(--ease);
}

.page-about .coord-card:hover::before,
.page-about .coord-card:focus-within::before {
  width: 82px;
  background: var(--lime);
}

.page-about .coord-no {
  display: block;
  font-size: var(--step-micro);
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .coord-title {
  margin: 0.5rem 0 0.5rem;
  font-size: var(--step-3);
  font-weight: 700;
}

.page-about .coord-text {
  margin: 0;
  color: var(--text-dim);
  line-height: 1.8;
  font-size: var(--step-small);
}

/* ---------- 版图标签页 ---------- */

.page-about .about-tabs {
  margin-top: clamp(1.5rem, 3.5vw, 2.25rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(11, 42, 35, 0.75), rgba(7, 23, 18, 0.4));
  overflow: hidden;
}

.page-about .about-tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-tab {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--text-dim);
  font-family: inherit;
  font-size: var(--step-small);
  font-weight: 700;
  letter-spacing: 0.02em;
  padding: 0.85rem clamp(0.85rem, 3vw, 1.5rem);
  cursor: pointer;
  position: relative;
  transition: color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about .about-tab::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: transparent;
  transition: background-color 0.25s var(--ease);
}

.page-about .about-tab:hover {
  color: var(--white);
  background: rgba(183, 255, 74, 0.05);
}

.page-about .about-tab[aria-selected="true"] {
  color: var(--night);
  background: var(--lime);
}

.page-about .about-tab[aria-selected="true"]::after {
  background: var(--lime);
}

.page-about .about-panel {
  padding: clamp(1.1rem, 3.5vw, 1.9rem);
}

.page-about .region-lead {
  margin: 0 0 1rem;
  line-height: 1.85;
  color: var(--white);
  max-width: 60ch;
}

.page-about .region-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.page-about .region-list li {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding-left: 0.9rem;
  position: relative;
  color: var(--text-dim);
  font-size: var(--step-small);
  line-height: 1.7;
}

.page-about .region-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  background: var(--signal);
  border-radius: 50%;
}

.page-about .region-key {
  color: var(--lime);
  font-weight: 700;
  font-size: var(--step-body);
  min-width: 2.4em;
}

.page-about .about-map-figure {
  margin: clamp(1.5rem, 3.5vw, 2.25rem) 0 0;
}

.page-about .about-map-figure .media-frame {
  border: 1px solid var(--line);
}

/* ---------- 团队 ---------- */

.page-about .about-team-wrap {
  margin-top: clamp(1.5rem, 3.5vw, 2.25rem);
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
}

.page-about .team-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .team-card {
  background: var(--bg-raise);
  padding: clamp(1.05rem, 3vw, 1.5rem);
}

.page-about .team-no {
  display: inline-block;
  font-size: var(--step-micro);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--night);
  background: var(--cyan);
  padding: 0.14rem 0.42rem;
  border-radius: var(--radius);
}

.page-about .team-title {
  margin: 0.65rem 0 0.45rem;
  font-size: var(--step-3);
  font-weight: 700;
}

.page-about .team-text {
  margin: 0;
  color: var(--text-dim);
  font-size: var(--step-small);
  line-height: 1.8;
}

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

.page-about .about-team-figure .media-frame {
  border: 1px solid var(--line);
}

/* ---------- 合作生态 ---------- */

.page-about .partner-grid {
  margin-top: clamp(1.5rem, 3.5vw, 2.25rem);
  display: grid;
  gap: clamp(0.85rem, 2vw, 1.25rem);
}

.page-about .partner-card {
  padding: clamp(1.05rem, 3vw, 1.5rem);
  border: 1px solid var(--line);
  border-left: 3px solid var(--turf);
  border-radius: var(--radius);
  background: rgba(11, 42, 35, 0.55);
  transition: border-left-color 0.3s var(--ease), background-color 0.3s var(--ease);
}

.page-about .partner-card:hover {
  border-left-color: var(--lime);
  background: rgba(11, 42, 35, 0.9);
}

.page-about .partner-num {
  display: block;
  font-size: clamp(1.5rem, 3.6vw, 2rem);
  font-weight: 700;
  color: var(--lime);
  line-height: 1;
}

.page-about .partner-plus {
  color: var(--signal);
}

.page-about .partner-title {
  margin: 0.5rem 0 0.4rem;
  font-size: var(--step-3);
  font-weight: 700;
}

.page-about .partner-text {
  margin: 0;
  color: var(--text-dim);
  font-size: var(--step-small);
  line-height: 1.8;
}

/* ---------- 赛季路线 ---------- */

.page-about .season-road {
  list-style: none;
  margin: clamp(1.5rem, 3.5vw, 2.25rem) 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(0.9rem, 2.5vw, 1.4rem);
  position: relative;
}

.page-about .season-road::before {
  content: "";
  position: absolute;
  top: 0.5rem;
  bottom: 0.5rem;
  left: 5px;
  width: 1px;
  background: linear-gradient(180deg, var(--lime), rgba(45, 212, 191, 0.4), rgba(201, 210, 204, 0.12));
}

.page-about .road-node {
  position: relative;
  padding-left: 1.6rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.page-about .road-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.42rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--night);
  border: 2px solid var(--cyan);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .road-node:hover::before {
  border-color: var(--lime);
  transform: scale(1.18);
}

.page-about .road-tag {
  font-size: var(--step-micro);
  letter-spacing: 0.16em;
  color: var(--signal);
}

.page-about .road-title {
  margin: 0;
  font-size: var(--step-3);
  font-weight: 700;
}

.page-about .road-text {
  margin: 0.4rem 0 0;
  color: var(--text-dim);
  font-size: var(--step-small);
  line-height: 1.8;
  max-width: 58ch;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .about-fact-row {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .coordinate-cards {
    grid-template-columns: repeat(3, 1fr);
  }

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

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

@media (min-width: 960px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.15fr);
  }

  .page-about .about-layout {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
  }

  .page-about .rail-list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0.15rem;
  }

  .page-about .rail-list a {
    width: 100%;
    border-color: transparent;
    border-left: 2px solid var(--line);
    border-radius: 0;
    padding: 0.5rem 0.5rem 0.5rem 0.75rem;
  }

  .page-about .rail-list a:hover,
  .page-about .rail-list a:focus-visible {
    border-left-color: var(--lime);
    background: rgba(183, 255, 74, 0.05);
  }

  .page-about .about-team-wrap {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .coord-card,
  .page-about .coord-card::before,
  .page-about .partner-card,
  .page-about .road-node::before,
  .page-about .rail-list a,
  .page-about .chapter-index {
    transition: none;
  }
}
<<<END>>>