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

.page-about a:focus-visible,
.page-about [tabindex]:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--electric);
  outline-offset: 3px;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 18px;
  padding-bottom: 4px;
}

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

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(139, 154, 146, 0.6);
}

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

.page-about .breadcrumb a:hover {
  border-bottom-color: var(--electric);
}

.page-about .breadcrumb li[aria-current="page"] {
  color: var(--cold-white);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 30px;
  padding-top: 22px;
  padding-bottom: 44px;
}

.page-about .about-hero__lead,
.page-about .about-hero__aside {
  min-width: 0;
}

.page-about .eyebrow {
  display: inline-block;
  margin: 0 0 16px;
  padding-left: 10px;
  border-left: 4px solid var(--signal);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--signal);
}

.page-about h1 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(36px, 9.6vw, 82px);
  line-height: 0.95;
  letter-spacing: -0.01em;
}

.page-about h1 .hl {
  color: var(--signal);
  -webkit-text-stroke: 0;
}

.page-about .about-lead {
  margin: 0 0 24px;
  padding-left: 16px;
  border-left: 3px solid rgba(216, 255, 62, 0.4);
  max-width: 48ch;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(244, 247, 241, 0.86);
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__aside {
  position: relative;
}

.page-about .about-hero__aside .img-frame {
  border: var(--stroke) solid var(--charcoal);
  background: var(--pitch-deep);
}

.page-about .about-hero__aside img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05);
}

.page-about .dossier {
  position: relative;
  z-index: 2;
  margin: -34px 10px 0;
  padding: 14px;
  border: var(--stroke) solid var(--charcoal);
  background: var(--pitch-deep);
  box-shadow: var(--hard-shadow);
}

.page-about .dossier-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--signal);
}

.page-about .dossier-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(139, 154, 146, 0.28);
}

.page-about .dossier-cell {
  background: var(--pitch-ink);
  padding: 12px 10px;
}

.page-about .dossier-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1.1;
  color: var(--signal);
  font-weight: 700;
}

.page-about .dossier-key {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--steel);
}

/* ---------- 斜切分隔 ---------- */
.page-about .about-cut {
  height: 42px;
  background: var(--pitch-deep);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  margin-bottom: -1px;
}

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: 30px;
  padding-top: 34px;
  padding-bottom: 56px;
}

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

.page-about .about-toc {
  order: -1;
  padding: 14px;
  border: var(--stroke) solid var(--charcoal);
  background: var(--pitch-deep);
  box-shadow: 5px 5px 0 var(--charcoal);
}

.page-about .toc-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-about .toc-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .toc-list a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 9px 8px;
  border-left: 3px solid rgba(139, 154, 146, 0.28);
  font-size: 14px;
  line-height: 1.5;
  color: var(--cold-white);
  text-decoration: none;
  transition: border-color 170ms ease-out, background 170ms ease-out, color 170ms ease-out;
}

.page-about .toc-list a:hover,
.page-about .toc-list a:focus-visible {
  border-left-color: var(--signal);
  background: rgba(216, 255, 62, 0.08);
  color: var(--signal);
}

.page-about .toc-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--steel);
  flex: none;
}

.page-about .about-block {
  scroll-margin-top: 92px;
}

.page-about .about-block + .about-block {
  margin-top: 46px;
}

.page-about .block-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  margin-bottom: 18px;
  border-bottom: 2px solid rgba(139, 154, 146, 0.28);
}

.page-about .block-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: clamp(26px, 6vw, 38px);
  line-height: 1;
  color: rgba(216, 255, 62, 0.55);
}

.page-about h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 5.2vw, 40px);
  line-height: 1.06;
  letter-spacing: -0.005em;
}

.page-about .block-lead {
  margin: 0 0 22px;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(244, 247, 241, 0.8);
}

.page-about .about-figure {
  margin: 0 0 26px;
  border: var(--stroke) solid var(--charcoal);
  background: var(--pitch-deep);
}

.page-about .about-figure img,
.page-about .circle img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.8) contrast(1.05);
}

/* ---------- 流程 ---------- */
.page-about .flow {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .flow-step {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 10px 16px 0;
  border-top: 1px solid rgba(139, 154, 146, 0.22);
  transition: background 170ms ease-out;
}

.page-about .flow-step:last-child {
  border-bottom: 1px solid rgba(139, 154, 146, 0.22);
}

.page-about .flow-step:hover {
  background: rgba(15, 46, 34, 0.72);
}

.page-about .flow-num {
  display: grid;
  place-items: center;
  width: 34px;
  height: 26px;
  background: var(--signal);
  color: var(--pitch-ink);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
}

.page-about .flow-step h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .flow-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 247, 241, 0.76);
}

/* ---------- 团队 ---------- */
.page-about .crew {
  display: grid;
  gap: 14px;
}

.page-about .crew-card {
  padding: 16px 16px 18px;
  border: var(--stroke) solid var(--charcoal);
  background: linear-gradient(158deg, rgba(15, 46, 34, 0.98), rgba(7, 19, 14, 0.98));
  box-shadow: 4px 4px 0 var(--charcoal);
  outline: none;
  transition: transform 180ms var(--ease), border-color 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .crew-card:hover,
.page-about .crew-card:focus-visible {
  border-color: var(--signal);
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 var(--charcoal);
}

.page-about .crew-tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--pitch-ink);
  font-weight: 700;
}

.page-about .crew-tag--signal {
  background: var(--signal);
}

.page-about .crew-tag--amber {
  background: var(--amber);
}

.page-about .crew-tag--electric {
  background: var(--electric);
}

.page-about .crew-card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.45;
  font-weight: 700;
}

.page-about .crew-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(244, 247, 241, 0.76);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  padding-left: 34px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 10px;
  width: 3px;
  background: linear-gradient(180deg, var(--signal), rgba(216, 255, 62, 0.12));
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 12px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 5px;
  width: 18px;
  height: 18px;
  background: var(--pitch-ink);
  border: 3px solid var(--steel);
  transition: border-color 180ms ease-out, background 180ms ease-out;
}

.page-about .tl-item:hover::before,
.page-about .tl-item[open]::before {
  border-color: var(--signal);
  background: var(--signal);
}

.page-about .tl-sum {
  display: block;
  padding: 2px 0 8px;
  cursor: pointer;
  list-style: none;
  outline: none;
}

.page-about .tl-sum::-webkit-details-marker {
  display: none;
}

.page-about .tl-sum::after {
  content: "＋";
  float: right;
  margin-left: 10px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--steel);
  transition: color 170ms ease-out;
}

.page-about .tl-item[open] .tl-sum::after {
  content: "－";
  color: var(--signal);
}

.page-about .tl-season {
  display: block;
  margin-bottom: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--signal);
}

.page-about .tl-title {
  display: block;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--cold-white);
}

.page-about .tl-item:hover .tl-title,
.page-about .tl-item[open] .tl-title {
  color: var(--signal);
}

.page-about .tl-body {
  margin: 0 0 6px;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(244, 247, 241, 0.76);
}

/* ---------- 规模 ---------- */
.page-about .stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(139, 154, 146, 0.28);
  border: 1px solid rgba(139, 154, 146, 0.28);
}

.page-about .stat {
  background: var(--pitch-ink);
  padding: 14px 12px 16px;
  transition: background 170ms ease-out;
}

.page-about .stat:hover {
  background: var(--pitch-deep);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 5vw, 32px);
  line-height: 1.1;
  color: var(--signal);
  font-weight: 700;
}

.page-about .stat-label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--steel);
}

/* ---------- 社群 ---------- */
.page-about .circle {
  display: grid;
  gap: 20px;
}

.page-about .circle .img-frame {
  border: var(--stroke) solid var(--charcoal);
  background: var(--pitch-deep);
}

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

.page-about .circle-list li {
  padding-left: 13px;
  border-left: 3px solid var(--feature);
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 247, 241, 0.82);
}

/* ---------- 收束 ---------- */
.page-about .about-next {
  padding: 20px 18px 22px;
  border: var(--stroke) solid var(--charcoal);
  background: var(--pitch-deep);
  box-shadow: var(--hard-shadow);
}

.page-about .next-lead {
  margin: 0 0 18px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 247, 241, 0.82);
}

.page-about .next-grid {
  display: grid;
  gap: 12px;
}

.page-about .next-link {
  display: block;
  padding: 14px;
  border: 2px solid rgba(139, 154, 146, 0.32);
  color: var(--cold-white);
  text-decoration: none;
  transition: border-color 170ms ease-out, background 170ms ease-out, transform 170ms ease-out;
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  border-color: var(--signal);
  background: rgba(216, 255, 62, 0.08);
  transform: translateY(-2px);
}

.page-about .next-link b {
  display: block;
  margin-bottom: 5px;
  font-size: 16px;
  color: var(--signal);
}

.page-about .next-link span {
  display: block;
  font-size: 13px;
  line-height: 1.65;
  color: var(--steel);
}

.page-about .next-note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .next-note a {
  color: var(--electric);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 中等宽度 ---------- */
@media (min-width: 700px) {
  .page-about .stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

  .page-about .circle {
    grid-template-columns: 0.92fr 1.08fr;
    align-items: center;
    gap: 26px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: 55fr 45fr;
    gap: 56px;
    align-items: start;
    padding-top: 30px;
    padding-bottom: 60px;
  }

  .page-about .about-body {
    grid-template-columns: minmax(0, 1fr) 276px;
    gap: 60px;
    align-items: start;
    padding-top: 44px;
    padding-bottom: 72px;
  }

  .page-about .about-main {
    order: 1;
  }

  .page-about .about-toc {
    order: 2;
    position: sticky;
    top: 92px;
  }

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

  .page-about .about-lead {
    font-size: 17px;
  }

  .page-about .block-lead {
    font-size: 16.5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .crew-card,
  .page-about .next-link,
  .page-about .toc-list a,
  .page-about .flow-step,
  .page-about .stat,
  .page-about .tl-item::before {
    transition: none;
  }

  .page-about .crew-card:hover,
  .page-about .crew-card:focus-visible,
  .page-about .next-link:hover,
  .page-about .next-link:focus-visible {
    transform: none;
  }
}
<<<END>>>