.page-about {
  --about-rail: 216px;
  --about-line: 1px solid var(--grid-line);
  --about-gap: clamp(28px, 4vw, 56px);
  --about-pad-y: clamp(48px, 7vw, 96px);
}

.page-about .about-crumbs {
  padding: clamp(20px, 3vw, 32px) 0 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
  padding: clamp(20px, 3vw, 36px) 0 clamp(40px, 6vw, 72px);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 0.94;
  font-size: clamp(40px, 9.2vw, 92px);
  margin: 14px 0 0;
  color: var(--paper);
}

.page-about .about-hero .lead {
  margin-top: 22px;
  max-width: 60ch;
  color: var(--silver);
  font-size: clamp(15px, 1.4vw, 18px);
  line-height: 1.8;
}

.page-about .about-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding-top: 22px;
  border-top: var(--about-line);
}

.page-about .about-meta-item dt {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--silver);
  margin-bottom: 6px;
}

.page-about .about-meta-item dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--lime);
}

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

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

/* ---------- 栅格骨架 ---------- */
.page-about .about-layout {
  display: block;
}

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

.page-about .chapter-rail {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding: 0 0 12px;
  margin-bottom: clamp(24px, 4vw, 40px);
  border-bottom: var(--about-line);
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .chapter-rail-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 8px 10px;
  font-size: 13px;
  color: var(--silver);
  text-decoration: none;
  border-left: 1px solid transparent;
  white-space: nowrap;
  transition: color 160ms linear, border-color 160ms linear;
}

.page-about .chapter-rail-link:hover {
  color: var(--cyan);
}

.page-about .chapter-rail-link[aria-current="true"] {
  color: var(--lime);
  border-left-color: var(--lime);
}

.page-about .chapter-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--silver);
}

.page-about .chapter-rail-link[aria-current="true"] .chapter-num {
  color: var(--lime);
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding: var(--about-pad-y) 0;
  border-top: var(--about-line);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: clamp(24px, 4vw, 40px);
}

.page-about .about-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .section-title {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  font-size: clamp(24px, 3.6vw, 40px);
  color: var(--paper);
  margin: 0;
}

.page-about .about-deck {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--silver);
  max-width: 62ch;
}

.page-about .about-prose {
  max-width: 68ch;
}

.page-about .about-prose p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper);
  margin: 0 0 1.1em;
}

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

/* ---------- 署名表 ---------- */
.page-about .about-sign {
  margin: clamp(28px, 4vw, 44px) 0 0;
  border-top: var(--about-line);
}

.page-about .about-sign-row {
  display: grid;
  gap: 6px;
  padding: 14px 0;
  border-bottom: var(--about-line);
}

.page-about .about-sign-row dt {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--silver);
}

.page-about .about-sign-row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
}

/* ---------- 时间线 ---------- */
.page-about .about-season-media {
  margin: 0 0 clamp(28px, 4vw, 40px);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: clamp(32px, 5vw, 52px) 0 0;
  padding: 0 0 0 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 14px;
  width: 1px;
  background: var(--grid-line);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: clamp(28px, 4vw, 44px);
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--violet);
  box-shadow: 0 0 0 5px rgba(138, 107, 255, 0.14);
  transition: box-shadow 200ms linear;
}

.page-about .tl-item:hover::before {
  box-shadow: 0 0 0 9px rgba(138, 107, 255, 0.2);
}

.page-about .tl-round {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--lime);
  margin: 0 0 8px;
}

.page-about .tl-title {
  font-size: 19px;
  font-weight: 600;
  color: var(--paper);
  margin: 0 0 8px;
}

.page-about .tl-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--silver);
  margin: 0;
  max-width: 62ch;
}

.page-about .tl-more {
  margin: 10px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--violet);
  font-size: 13px;
  line-height: 1.7;
  color: var(--silver);
  opacity: 1;
  max-width: 62ch;
  transition: color 200ms linear, border-color 200ms linear;
}

.page-about .tl-item:hover .tl-more {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 统计 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid-line);
  border: var(--about-line);
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .about-stats .stat {
  background: var(--ink-night);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-stats .stat-value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1;
  color: var(--paper);
}

.page-about .about-stats .stat--accent .stat-value {
  color: var(--orange);
}

.page-about .about-stats .stat-label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--silver);
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  border: var(--about-line);
  display: grid;
  gap: 1px;
  background: var(--grid-line);
}

.page-about .about-flow-item {
  background: var(--ink-night);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 18px 20px;
}

.page-about .flow-idx {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
  padding-top: 3px;
}

.page-about .flow-body strong {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
  margin-bottom: 5px;
}

.page-about .flow-body p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--silver);
  max-width: 58ch;
}

/* ---------- 团队全宽带 ---------- */
.page-about .about-team-band {
  background: var(--ink-room);
  border-top: var(--about-line);
  border-bottom: var(--about-line);
  padding: var(--about-pad-y) 0;
}

.page-about .about-team-bar {
  display: flex;
  height: 10px;
  margin: 0 0 clamp(28px, 4vw, 40px);
  overflow: hidden;
}

.page-about .team-seg {
  display: block;
  height: 100%;
}

.page-about .team-seg--a { background: var(--lime); }
.page-about .team-seg--b { background: var(--cyan); }
.page-about .team-seg--c { background: var(--violet); }
.page-about .team-seg--d { background: var(--orange); }

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

.page-about .team-cell {
  background: var(--ink-night);
  padding: 24px 22px 22px;
  min-width: 0;
}

.page-about .team-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(34px, 6vw, 52px);
  line-height: 1;
  color: var(--lime);
}

.page-about .team-name {
  margin: 10px 0 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .team-cell details {
  margin-top: 14px;
  border-top: var(--about-line);
  padding-top: 12px;
}

.page-about .team-cell summary {
  cursor: pointer;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  list-style: none;
}

.page-about .team-cell summary::-webkit-details-marker {
  display: none;
}

.page-about .team-cell summary::before {
  content: "+ ";
  font-family: var(--font-mono);
}

.page-about .team-cell details[open] summary::before {
  content: "− ";
}

.page-about .team-cell details p {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--silver);
}

/* ---------- 本地视角 ---------- */
.page-about .about-local-grid {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
}

.page-about .about-local-media {
  margin: 0;
}

.page-about .about-city-list {
  list-style: none;
  margin: clamp(26px, 4vw, 36px) 0 0;
  padding: 0;
  border-top: var(--about-line);
  max-width: 62ch;
}

.page-about .about-city-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 13px 0;
  border-bottom: var(--about-line);
}

.page-about .about-city-item span:first-child {
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-city-item span:last-child {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--silver);
  text-align: right;
}

/* ---------- 边界 ---------- */
.page-about .about-limits-section .about-head {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-limits {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--about-line);
}

.page-about .limit-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-bottom: var(--about-line);
}

.page-about .limit-mark {
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.4;
  color: var(--red);
}

.page-about .limit-item strong {
  display: block;
  font-size: 16px;
  font-weight: 600;
  color: var(--paper);
  margin-bottom: 6px;
}

.page-about .limit-item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--silver);
  max-width: 60ch;
}

/* ---------- 收尾 ---------- */
.page-about .about-outro {
  border-top: var(--about-line);
  padding: var(--about-pad-y) 0 0;
}

.page-about .about-outro .subtitle {
  font-size: 20px;
  font-weight: 600;
  color: var(--paper);
  margin: 0 0 14px;
}

.page-about .about-outro-text {
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--silver);
  margin: 0 0 clamp(24px, 4vw, 34px);
}

.page-about .about-outro-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: clamp(48px, 7vw, 88px);
}

.page-about .about-outro-actions .btn {
  text-decoration: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-sign-row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-local-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-sign-row {
    grid-template-columns: 190px minmax(0, 1fr);
  }
}

@media (min-width: 1040px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .chapter-rail {
    flex-direction: column;
    gap: 2px;
    position: sticky;
    top: 124px;
    overflow: visible;
    padding: 0;
    margin-bottom: 0;
    border-bottom: 0;
    border-left: var(--about-line);
  }

  .page-about .chapter-rail-link {
    border-left: 2px solid transparent;
    margin-left: -1px;
    white-space: normal;
    padding: 10px 14px;
  }

  .page-about .chapter-rail-link[aria-current="true"] {
    border-left-color: var(--lime);
    background: rgba(196, 249, 74, 0.05);
  }

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

@media (hover: none) {
  .page-about .tl-more {
    color: var(--silver);
    border-left-color: var(--grid-line);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter-rail-link,
  .page-about .tl-item::before,
  .page-about .tl-more {
    transition: none;
  }
}
<<<END>>>