.page-about {
  --about-cut: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
  --about-cut-sm: polygon(0 0, calc(100% - 9px) 0, 100% 9px, 100% 100%, 9px 100%, 0 calc(100% - 9px));
  --about-amber: #FF4D00;
  --about-arc: #00C8FF;
  --about-flux: #00FFC8;
  display: block;
  background: var(--bg);
  color: var(--text);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}
.page-about .breadcrumbs__inner {
  max-width: var(--shell);
  margin-inline: auto;
  padding: 14px var(--gutter);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12.5px;
  letter-spacing: .06em;
}
.page-about .breadcrumbs__item {
  color: var(--muted);
  text-decoration: none;
  transition: color .16s ease;
}
.page-about .breadcrumbs__item[href]:hover {
  color: var(--accent-2);
}
.page-about .breadcrumbs__item[aria-current="page"] {
  color: var(--text);
}
.page-about .breadcrumbs__sep {
  color: var(--line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(118% 86% at 90% 4%, rgba(255, 77, 0, .24), transparent 60%),
    radial-gradient(74% 62% at 4% 102%, rgba(0, 200, 255, .16), transparent 62%),
    var(--bg);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(0deg, rgba(255, 255, 255, .03) 0 1px, transparent 1px 5px);
  opacity: .55;
}
.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(34px, 6vw, 76px) var(--gutter) clamp(34px, 5vw, 64px);
}
.page-about .about-hero .label {
  margin: 0;
}
.page-about .about-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 8.6vw, 92px);
  line-height: .98;
  letter-spacing: -.035em;
  color: var(--text);
}
.page-about .about-hero__lead {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.82;
  color: #C9CCD1;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(30px, 4.4vw, 52px) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
  clip-path: var(--about-cut-sm);
}
.page-about .about-stats__item {
  background: rgba(26, 26, 26, .88);
  padding: 18px 22px 20px;
}
.page-about .about-stats dt {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
}
.page-about .about-stats dd {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 5vw, 44px);
  line-height: 1;
  color: var(--about-flux);
  font-variant-numeric: tabular-nums;
}
.page-about .about-stats dd span {
  margin-left: 8px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 400;
  color: var(--muted);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body__inner {
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 56px);
  padding-block: clamp(34px, 5vw, 68px);
}

/* ---------- 侧栏目录 ---------- */
.page-about .about-toc {
  align-self: start;
}
.page-about .about-toc__label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--muted);
}
.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .about-toc__list::-webkit-scrollbar {
  display: none;
}
.page-about .about-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 9px 13px;
  border: 1px solid var(--line);
  clip-path: var(--about-cut-sm);
  color: var(--muted);
  text-decoration: none;
  font-size: 13px;
  letter-spacing: .04em;
  transition: color .16s ease, border-color .16s ease, background-color .16s ease;
}
.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--text);
  border-color: var(--accent);
  background: rgba(255, 77, 0, .07);
}
.page-about .about-toc__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-block: clamp(26px, 3.6vw, 44px);
  border-top: 1px solid var(--line);
  scroll-margin-top: 104px;
}
.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .about-section--last {
  padding-bottom: clamp(40px, 6vw, 72px);
}
.page-about .about-section__head {
  margin-bottom: clamp(20px, 2.8vw, 30px);
}
.page-about .about-h2 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1.1;
  letter-spacing: -.025em;
  color: var(--text);
}
.page-about .about-section__intro {
  margin: 14px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}
.page-about .about-tail {
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 66ch;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(22px, 3vw, 32px);
}
.page-about .about-figure .figure__frame,
.page-about .coverage-figure .figure__frame {
  clip-path: var(--about-cut);
  border: 1px solid var(--line);
  background: var(--surface);
  overflow: hidden;
}
.page-about .about-figure img,
.page-about .coverage-figure img,
.page-about .chronicle-shell__bg img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}
.page-about .about-figure img {
  height: clamp(200px, 42vw, 380px);
  object-fit: cover;
}
.page-about .coverage-figure img {
  height: clamp(190px, 36vw, 280px);
  object-fit: cover;
}
.page-about .figure__caption {
  margin: 12px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 职能矩阵 ---------- */
.page-about .role-matrix {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .role-card {
  background: var(--surface);
  padding: clamp(20px, 2.6vw, 28px);
  transition: background-color .18s ease;
}
.page-about .role-card:nth-child(even) {
  background: var(--surface-2);
}
.page-about .role-card:hover {
  background: #1E1E1E;
}
.page-about .role-card__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.page-about .role-card__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--accent);
}
.page-about .role-card__name {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--text);
}
.page-about .role-card__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--about-arc);
  white-space: nowrap;
}
.page-about .role-card__duty {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: #B4B8BE;
}
.page-about .role-card__detail {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height .3s ease, opacity .28s ease, margin-top .3s ease;
}
.page-about .role-card__detail li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .role-card__detail li + li {
  margin-top: 5px;
}
.page-about .role-card__detail li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 6px;
  height: 1px;
  background: var(--about-arc);
}
.page-about .role-card:hover .role-card__detail,
.page-about .role-card:focus-within .role-card__detail {
  max-height: 220px;
  opacity: 1;
  margin-top: 12px;
}

/* ---------- 流程四步 ---------- */
.page-about .flow-strip {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .flow-step {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--bg);
}
.page-about .flow-step__num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 4.6vw, 46px);
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--accent);
}
@supports (-webkit-text-stroke: 1px red) {
  .page-about .flow-step__num {
    color: transparent;
    -webkit-text-stroke: 1px var(--accent);
  }
}
.page-about .flow-step__title {
  margin: 0;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--text);
}
.page-about .flow-step p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .chronicle-shell {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--surface-2);
  clip-path: var(--about-cut);
  padding: clamp(24px, 3.6vw, 46px) clamp(20px, 3.2vw, 44px);
}
.page-about .chronicle-shell__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}
.page-about .chronicle-shell__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .18;
  filter: saturate(1.5) contrast(1.15);
}
.page-about .chronicle-shell::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(13, 13, 13, .82), rgba(13, 13, 13, .94));
}
.page-about .timeline {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0 0 0 34px;
}
.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--accent), var(--about-arc) 58%, rgba(42, 45, 49, .25));
}
.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(20px, 2.8vw, 30px);
}
.page-about .timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--accent);
  background: var(--bg);
  box-shadow: 0 0 0 4px rgba(255, 77, 0, .09);
}
.page-about .timeline__meta {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0 0 8px;
}
.page-about .timeline__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--about-arc);
  font-variant-numeric: tabular-nums;
}
.page-about .timeline__season {
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--muted);
}
.page-about .timeline__title {
  margin: 0;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--text);
}
.page-about .timeline__desc {
  margin: 8px 0 0;
  max-width: 62ch;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 覆盖范围 ---------- */
.page-about .coverage-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 44px);
}
.page-about .coverage-main .prose {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: #C9CCD1;
}
.page-about .coverage-facts {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-about .coverage-facts li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 4px;
  background: var(--bg);
}
.page-about .coverage-facts__num {
  flex: 0 0 auto;
  min-width: 78px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.page-about .coverage-facts__txt {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}
.page-about .coverage-figure {
  margin: 0;
}
.page-about .zone-chips {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 6px;
}
.page-about .zone-chips li {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--line);
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  clip-path: var(--about-cut-sm);
}
.page-about .zone-chips li:nth-child(3n) {
  border-color: rgba(0, 200, 255, .45);
  color: var(--about-arc);
}
.page-about .zone-chips li:nth-child(5n) {
  border-color: rgba(255, 77, 0, .5);
  color: var(--accent);
}

/* ---------- 数据说明 ---------- */
.page-about .method-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.page-about .method-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: clamp(16px, 2.2vw, 22px) 0;
  border-bottom: 1px solid var(--line);
}
.page-about .method-item dt {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--text);
}
.page-about .method-item dd {
  margin: 0;
  max-width: 66ch;
  font-size: 14px;
  line-height: 1.82;
  color: var(--muted);
}

/* ---------- 同行 ---------- */
.page-about .join-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}
.page-about .join-card {
  position: relative;
  padding: clamp(20px, 2.6vw, 28px);
  background: var(--surface);
  border: 1px solid var(--line);
  clip-path: var(--about-cut);
  transition: border-color .18s ease, background-color .18s ease;
}
.page-about .join-card:hover {
  border-color: rgba(255, 77, 0, .55);
  background: #1C1C1C;
}
.page-about .join-card__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--text);
}
.page-about .join-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .join-card__link {
  display: inline-block;
  margin-top: 16px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--about-arc);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .16s ease, border-color .16s ease;
}
.page-about .join-card__link:hover,
.page-about .join-card__link:focus-visible {
  color: var(--about-flux);
  border-bottom-color: var(--about-flux);
}

.page-about .join-cta {
  margin-top: clamp(22px, 3vw, 34px);
  padding: clamp(20px, 2.8vw, 30px);
  background: linear-gradient(135deg, rgba(255, 77, 0, .16), rgba(0, 200, 255, .1));
  border: 1px solid var(--line);
  clip-path: var(--about-cut);
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.page-about .join-cta__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--text);
}
.page-about .join-cta__note {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .join-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .role-matrix {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .flow-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .method-item {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 22px;
  }
  .page-about .join-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .join-grid .join-card:last-child {
    grid-column: 1 / -1;
  }
  .page-about .join-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

@media (min-width: 860px) {
  .page-about .role-matrix {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
  .page-about .role-card:nth-child(1) {
    grid-column: span 3;
  }
  .page-about .role-card:nth-child(2) {
    grid-column: span 2;
  }
  .page-about .role-card:nth-child(3) {
    grid-column: span 2;
  }
  .page-about .role-card:nth-child(4) {
    grid-column: span 3;
  }
  .page-about .flow-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .coverage-layout {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .join-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .join-grid .join-card:last-child {
    grid-column: auto;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }
  .page-about .about-toc {
    position: sticky;
    top: 104px;
  }
  .page-about .about-toc__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .about-toc__link {
    display: flex;
    border: 0;
    border-left: 2px solid var(--line);
    clip-path: none;
    padding: 8px 0 8px 14px;
    border-radius: 0;
    background: transparent;
  }
  .page-about .about-toc__link:hover,
  .page-about .about-toc__link:focus-visible {
    border-left-color: var(--accent);
    background: rgba(255, 77, 0, .06);
  }
}

@media (hover: none) {
  .page-about .role-card__detail {
    max-height: 220px;
    opacity: 1;
    margin-top: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role-card,
  .page-about .role-card__detail,
  .page-about .join-card,
  .page-about .join-card__link,
  .page-about .about-toc__link,
  .page-about .breadcrumbs__item {
    transition: none;
  }
}
<<<END>>>