.page-about {
  --about-rail-w: 236px;
  --about-rail-gap: 56px;
  background: var(--ink-800);
  color: var(--text-1);
  padding-bottom: 72px;
}

.page-about .about-crumbs {
  padding-top: 20px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background-color: var(--ink-900);
  background-image:
    radial-gradient(120% 96% at 84% -10%, rgba(185, 136, 63, 0.20), rgba(10, 22, 34, 0) 62%),
    repeating-linear-gradient(0deg, rgba(36, 56, 75, 0.55) 0 1px, rgba(36, 56, 75, 0) 1px 24px),
    repeating-linear-gradient(90deg, rgba(36, 56, 75, 0.55) 0 1px, rgba(36, 56, 75, 0) 1px 24px);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 22px;
  padding-top: 52px;
  padding-bottom: 48px;
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 7.4vw, 62px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.01em;
  max-width: 20ch;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 56ch;
  color: var(--text-2);
  font-size: var(--step-3);
  line-height: 1.75;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 16px 0 0;
  padding: 22px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  border-top: 1px solid var(--line);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--step-5);
  letter-spacing: 0.04em;
  color: var(--brass-soft);
  border-bottom: 1px solid rgba(224, 188, 130, 0.42);
  padding-bottom: 6px;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: var(--step-2);
  color: var(--slate);
}

/* ---------- 两栏布局 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 28px;
  padding-top: 40px;
}

.page-about .about-rail {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-rail__label {
  margin: 0;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .index-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  color: var(--text-2);
  font-size: var(--step-2);
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid var(--line);
  background: var(--ink-700);
  transition: color 180ms ease, border-color 180ms ease;
}

.page-about .index-link__num {
  font-size: 12px;
  color: var(--brass);
}

.page-about .index-link:hover,
.page-about .index-link:focus-visible {
  color: var(--text-1);
  border-color: var(--brass-soft);
}

.page-about .index-link[aria-current="true"] {
  color: var(--text-1);
  border-color: var(--brass);
}

/* ---------- 内容画布 ---------- */
.page-about .about-canvas {
  min-width: 0;
}

.page-about .about-section {
  padding: 40px 0 0;
  scroll-margin-top: 96px;
}

.page-about .about-section + .about-section {
  margin-top: 40px;
  border-top: 1px solid var(--line);
}

.page-about .about-section__title {
  margin: 8px 0 16px;
  font-family: var(--font-display);
  font-size: clamp(24px, 4.6vw, 42px);
  font-weight: 900;
  line-height: 1.16;
  max-width: 24ch;
}

.page-about .about-section__lead {
  margin: 0 0 20px;
  max-width: 60ch;
  color: var(--text-2);
  font-size: var(--step-3);
  line-height: 1.75;
}

.page-about .about-prose p {
  color: var(--text-2);
  font-size: var(--step-3);
  line-height: 1.78;
}

.page-about .about-prose a {
  color: var(--brass-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

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

.page-about .about-figure img,
.page-about .about-band img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .about-figure figcaption,
.page-about .about-band figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--slate);
}

.page-about .about-band {
  margin: 40px 0 0;
  scroll-margin-top: 96px;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 8px 0 0;
  padding: 0 0 0 22px;
  border-left: 1px solid var(--line);
}

.page-about .tl-node {
  position: relative;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 24px;
  width: 9px;
  height: 9px;
  background: var(--brass);
  transform: rotate(45deg);
}

.page-about .tl-details {
  border-bottom: 1px solid var(--line);
}

.page-about .tl-details summary {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 10px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-details summary:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 3px;
}

.page-about .tl-year {
  font-size: var(--step-2);
  color: var(--brass-soft);
  letter-spacing: 0.04em;
}

.page-about .tl-title {
  font-family: var(--font-display);
  font-size: var(--step-4);
  font-weight: 700;
  color: var(--text-1);
}

.page-about .tl-hint {
  font-size: 12px;
  color: var(--slate);
}

.page-about .tl-details[open] .tl-hint {
  color: var(--celadon);
}

.page-about .tl-body {
  padding: 0 0 20px 78px;
  color: var(--text-2);
  font-size: var(--step-3);
  line-height: 1.78;
}

.page-about .tl-body p {
  margin: 0;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .team-card {
  padding: 22px 20px;
  background: var(--ink-700);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
  transition: border-color 180ms ease;
}

.page-about .team-card:nth-child(2) {
  clip-path: polygon(var(--cut) 0, 100% 0, 100% 100%, 0 100%, 0 var(--cut));
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  border-color: var(--brass-soft);
}

.page-about .team-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--step-6);
  letter-spacing: 0.04em;
  color: var(--brass);
  line-height: 1;
}

.page-about .team-card h3 {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-size: var(--step-4);
  color: var(--text-1);
}

.page-about .team-card p {
  margin: 0;
  color: var(--text-2);
  font-size: var(--step-3);
  line-height: 1.72;
}

.page-about .about-aside {
  margin: 20px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--brass);
  color: var(--text-2);
  font-size: var(--step-3);
  line-height: 1.75;
}

/* ---------- 校对 ---------- */
.page-about .about-figure--flow {
  margin-bottom: 24px;
}

.page-about .paper-block {
  background: var(--paper);
  color: var(--on-paper-1);
  padding: 26px 20px;
}

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

.page-about .check-list li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid rgba(10, 22, 34, 0.16);
}

.page-about .check-list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .check-list__num {
  font-size: var(--step-3);
  color: var(--brass-ink);
}

.page-about .check-list__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: var(--step-4);
  color: var(--on-paper-1);
}

.page-about .check-list p {
  margin: 0;
  color: var(--on-paper-2);
  font-size: var(--step-3);
  line-height: 1.72;
}

.page-about .about-notes {
  display: grid;
  gap: 18px;
  margin-top: 24px;
  padding-top: 22px;
  border-top: 1px solid rgba(10, 22, 34, 0.16);
}

.page-about .about-note {
  padding-left: 14px;
  border-left: 2px solid var(--brass);
}

.page-about .about-note h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: var(--step-3);
  color: var(--on-paper-1);
}

.page-about .about-note p {
  margin: 0;
  color: var(--on-paper-2);
  font-size: var(--step-2);
  line-height: 1.72;
}

/* ---------- 协作 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: 24px;
}

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

.page-about .partner-figures li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .partner-figures__num {
  flex: 0 0 auto;
  min-width: 72px;
  font-family: var(--font-mono);
  font-size: var(--step-5);
  letter-spacing: 0.04em;
  color: var(--celadon);
}

.page-about .partner-figures__label {
  color: var(--text-2);
  font-size: var(--step-2);
  line-height: 1.6;
}

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

.page-about .result-grid li {
  padding: 20px 16px;
  background: var(--ink-800);
}

.page-about .result-grid li:nth-child(3n) {
  background: var(--ink-700);
}

.page-about .result-grid__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--step-4);
  letter-spacing: 0.04em;
  color: var(--brass-soft);
  border-bottom: 1px solid rgba(224, 188, 130, 0.35);
  padding-bottom: 8px;
  margin-bottom: 10px;
}

.page-about .result-grid li:nth-child(8) .result-grid__num {
  color: var(--amber);
  border-bottom-color: rgba(240, 138, 36, 0.45);
}

.page-about .result-grid__label {
  display: block;
  color: var(--text-2);
  font-size: var(--step-2);
  line-height: 1.65;
}

/* ---------- 收尾 ---------- */
.page-about .about-closing {
  margin-top: 64px;
  padding-top: 40px;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 32px;
}

.page-about .about-quote {
  margin: 0;
  padding-left: 20px;
  border-left: 3px solid var(--brass-soft);
}

.page-about .about-quote p {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(20px, 4vw, 30px);
  line-height: 1.4;
  color: var(--text-1);
}

.page-about .about-quote__by {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--slate);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding-bottom: 24px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 560px) {
  .page-about .tl-details summary {
    grid-template-columns: 58px minmax(0, 1fr);
  }

  .page-about .tl-hint {
    display: none;
  }

  .page-about .tl-body {
    padding-left: 58px;
  }
}

@media (min-width: 720px) {
  .page-about .about-hero__inner {
    padding-top: 72px;
    padding-bottom: 64px;
  }

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

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
    gap: 32px;
  }

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

  .page-about .paper-block {
    padding: 40px 36px;
  }

  .page-about .about-notes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .partner-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.75fr);
    gap: 36px;
    align-items: start;
  }

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

  .page-about .about-closing {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 40px;
    margin-top: 88px;
    padding-top: 56px;
  }

  .page-about .about-cta {
    padding-bottom: 0;
  }
}

@media (min-width: 960px) {
  .page-about {
    padding-bottom: 120px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr);
    padding-top: 88px;
    padding-bottom: 72px;
  }

  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-rail-gap);
    padding-top: 56px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    border-left: 1px solid var(--line);
    padding: 0;
  }

  .page-about .index-link {
    border: 0;
    background: transparent;
    padding: 11px 0 11px 16px;
    position: relative;
  }

  .page-about .index-link[aria-current="true"]::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 6px;
    bottom: 6px;
    width: 2px;
    background: var(--brass);
  }

  .page-about .about-section {
    padding-top: 0;
    scroll-margin-top: 112px;
  }

  .page-about .about-section + .about-section {
    margin-top: 72px;
    padding-top: 56px;
  }

  .page-about .about-band {
    margin-top: 72px;
    scroll-margin-top: 112px;
  }

  .page-about .about-timeline {
    padding-left: 28px;
  }

  .page-about .tl-node::before {
    left: -33px;
  }

  .page-about .tl-details summary {
    grid-template-columns: 92px minmax(0, 1fr) auto;
    padding: 18px 0;
  }

  .page-about .tl-body {
    padding-left: 102px;
  }

  .page-about .about-closing {
    margin-top: 104px;
  }
}
<<<END>>>