.page-about {
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

.page-about .about-crumbs {
  padding: 1.4rem 0 0;
  font-size: .82rem;
  color: rgba(21, 25, 29, .62);
}

.page-about .about-crumbs a {
  color: var(--celadon-ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .18s ease, color .18s ease;
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

.page-about h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.72rem, 4.6vw, 2.85rem);
  line-height: 1.22;
  letter-spacing: -.01em;
  margin: .55rem 0 1rem;
}

.page-about h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.32rem, 3vw, 1.95rem);
  line-height: 1.32;
  margin: .35rem 0 .85rem;
}

.page-about h3 {
  font-family: var(--font-display);
  font-weight: 700;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .16em;
  color: var(--copper);
  margin: 0;
}

.page-about .lede {
  font-size: 1.02rem;
  line-height: 1.8;
  color: rgba(21, 25, 29, .8);
  max-width: var(--measure);
}

.page-about .prose p {
  margin: 0 0 .95rem;
  font-size: 1rem;
  line-height: 1.88;
  color: rgba(21, 25, 29, .82);
  max-width: var(--measure);
}

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

.page-about .section-head {
  max-width: 44rem;
  margin-bottom: 1.5rem;
}

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

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
}

.page-about .about-figure img {
  border: 1px solid var(--line-soft);
  box-shadow: var(--shadow-plate);
  background: var(--paper-white);
}

.page-about .media-caption {
  margin-top: .65rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  line-height: 1.6;
  color: rgba(21, 25, 29, .58);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(1.75rem, 5vw, 3.25rem) 0 clamp(2rem, 6vw, 4rem);
}

.page-about .about-hero-grid {
  display: grid;
  gap: 1.65rem;
}

.page-about .about-hero-grid > * {
  min-width: 0;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.4rem;
}

.page-about .about-hero-panel {
  border-top: 3px solid var(--copper);
  padding: clamp(1.1rem, 3vw, 1.7rem);
  color: var(--paper-white);
  align-self: start;
}

.page-about .fact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .85rem;
}

.page-about .fact-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .85rem;
  align-items: baseline;
  padding-bottom: .8rem;
  border-bottom: 1px solid var(--line-on-dark-soft);
}

.page-about .fact-row:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .fact-num {
  font-size: 1.35rem;
  color: var(--copper-light);
  letter-spacing: .02em;
}

.page-about .fact-label {
  font-size: .86rem;
  line-height: 1.65;
  color: rgba(251, 247, 240, .78);
}

/* ---------- 缘起 ---------- */
.page-about .about-origin-grid {
  display: grid;
  gap: 1.75rem;
}

.page-about .about-origin-grid > * {
  min-width: 0;
}

/* ---------- 年份索引与时间轴 ---------- */
.page-about .about-arc-grid {
  display: grid;
  gap: 1.75rem;
}

.page-about .year-index ul {
  list-style: none;
  margin: .7rem 0 .8rem;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
}

.page-about .year-index a {
  display: block;
  padding: .3rem .65rem;
  font-family: var(--font-mono);
  font-size: .85rem;
  color: var(--ink-navy);
  text-decoration: none;
  border-left: 2px solid var(--line-strong);
  transition: border-color .18s ease, color .18s ease, background-color .18s ease;
}

.page-about .year-index a:hover,
.page-about .year-index a:focus-visible {
  color: var(--cinnabar);
  border-left-color: var(--cinnabar);
  background: rgba(178, 58, 42, .06);
}

.page-about .year-index-note {
  margin: 0;
  font-size: .78rem;
  line-height: 1.7;
  color: rgba(21, 25, 29, .58);
  max-width: 14rem;
}

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

.page-about .arc-lede {
  margin: 0 0 1.6rem;
  font-size: .98rem;
  line-height: 1.85;
  color: rgba(21, 25, 29, .78);
  max-width: var(--measure);
}

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

.page-about .tl-item {
  position: relative;
  padding: 0 0 2rem 1.85rem;
  border-left: 1px solid var(--line-strong);
  scroll-margin-top: 6rem;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: .35rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--copper);
}

.page-about .tl-item:last-child::before {
  background: var(--celadon);
  border-color: var(--celadon);
}

.page-about .tl-item .tag {
  margin-bottom: .55rem;
}

.page-about .tl-item h3 {
  margin: 0 0 .45rem;
  font-size: 1.08rem;
  line-height: 1.4;
}

.page-about .tl-item p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.85;
  color: rgba(21, 25, 29, .78);
  max-width: var(--measure);
}

/* ---------- 团队 ---------- */
.page-about .team-matrix {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  margin-top: 1.4rem;
}

.page-about .team-cell {
  background: var(--paper-white);
  padding: clamp(1.1rem, 2.6vw, 1.6rem);
  min-width: 0;
}

.page-about .team-cell h3 {
  margin: .6rem 0 .45rem;
  font-size: 1.08rem;
}

.page-about .team-cell p {
  margin: 0;
  font-size: .94rem;
  line-height: 1.8;
  color: rgba(21, 25, 29, .76);
}

.page-about .team-foot {
  display: grid;
  gap: 1.6rem;
  margin-top: 1.9rem;
}

.page-about .team-foot > * {
  min-width: 0;
}

.page-about .team-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.1rem;
  margin: 0;
}

.page-about .stat {
  border-top: 2px solid var(--copper);
  padding-top: .55rem;
  min-width: 0;
}

.page-about .stat-label {
  font-size: .78rem;
  line-height: 1.55;
  color: rgba(21, 25, 29, .6);
  margin-bottom: .2rem;
}

.page-about .stat-num {
  margin: 0;
  font-size: 1.15rem;
  line-height: 1.4;
  color: var(--ink-navy);
  word-break: break-word;
}

/* ---------- 核验 ---------- */
.page-about .about-check {
  color: var(--paper-white);
}

.page-about .about-check .eyebrow {
  color: var(--copper-light);
}

.page-about .about-check h2 {
  color: var(--paper-white);
}

.page-about .about-check p {
  font-size: .98rem;
  line-height: 1.85;
  color: rgba(251, 247, 240, .8);
  max-width: var(--measure);
}

.page-about .about-check .media-caption {
  color: rgba(251, 247, 240, .6);
}

.page-about .about-figure--flow {
  margin-top: 1.5rem;
}

.page-about .about-check .about-figure img {
  border-color: var(--line-on-dark);
  box-shadow: none;
  background: var(--ink-navy-deep);
}

.page-about .check-steps {
  display: grid;
  gap: .8rem;
  margin-top: 1.6rem;
  align-content: start;
}

.page-about .check-step {
  background: rgba(251, 247, 240, .055);
  border: 1px solid var(--line-on-dark);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .check-step summary {
  display: flex;
  align-items: center;
  gap: .7rem;
  padding: .95rem 1.05rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper-white);
  transition: background-color .18s ease;
}

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

.page-about .check-step summary:hover,
.page-about .check-step summary:focus-visible {
  background: rgba(228, 206, 158, .1);
}

.page-about .check-step summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--copper-light);
}

.page-about .check-step[open] summary::after {
  content: "–";
}

.page-about .check-step summary .mono {
  font-size: .8rem;
  color: var(--copper-light);
}

.page-about .check-step ul {
  margin: 0;
  padding: 0 1.1rem 1.05rem 2.5rem;
  font-size: .9rem;
  line-height: 1.85;
  color: rgba(251, 247, 240, .82);
}

.page-about .check-step li + li {
  margin-top: .3rem;
}

/* ---------- 记录查询 ---------- */
.page-about .records-grid {
  display: grid;
  gap: 1.75rem;
}

.page-about .records-grid > * {
  min-width: 0;
}

.page-about .records-copy .btn {
  margin-top: 1.2rem;
}

.page-about .clue-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .clue {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .9rem;
  align-items: start;
  background: var(--paper-white);
  padding: 1.05rem 1.15rem;
}

.page-about .clue-num {
  font-size: .86rem;
  color: var(--copper);
  padding-top: .15rem;
}

.page-about .clue h3 {
  margin: 0 0 .3rem;
  font-size: .98rem;
  line-height: 1.45;
}

.page-about .clue p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: rgba(21, 25, 29, .74);
}

/* ---------- 合作生态 ---------- */
.page-about .eco-grid {
  display: grid;
  gap: 1.1rem;
}

.page-about .eco-card {
  background: var(--paper-white);
  border: 1px solid var(--line-soft);
  border-top: 3px solid var(--celadon);
  padding: 1.15rem 1.2rem;
  min-width: 0;
}

.page-about .eco-card h3 {
  margin: .65rem 0 .45rem;
  font-size: 1rem;
  line-height: 1.45;
}

.page-about .eco-card p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: rgba(21, 25, 29, .76);
}

/* ---------- 承诺 ---------- */
.page-about .promise-grid {
  list-style: none;
  margin: 1.4rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.1rem;
}

.page-about .promise-card {
  background: var(--paper-white);
  border: 1px solid var(--line-strong);
  padding: 1.25rem 1.15rem;
  min-width: 0;
  position: relative;
}

.page-about .promise-card::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 26px;
  height: 26px;
  border-right: 1px solid var(--copper);
  border-bottom: 1px solid var(--copper);
  opacity: .7;
}

.page-about .promise-card h3 {
  margin: .7rem 0 .45rem;
  font-size: 1.05rem;
}

.page-about .promise-card p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: rgba(21, 25, 29, .76);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding-bottom: clamp(2.5rem, 6vw, 4rem);
}

.page-about .about-cta-panel {
  border-top: 3px solid var(--copper);
  padding: clamp(1.4rem, 4vw, 2.6rem);
  display: grid;
  gap: 1.4rem;
  color: var(--paper-white);
}

.page-about .about-cta-copy h2 {
  color: var(--paper-white);
}

.page-about .about-cta-copy .eyebrow {
  color: var(--copper-light);
}

.page-about .about-cta-copy p {
  margin: 0;
  font-size: .96rem;
  line-height: 1.8;
  color: rgba(251, 247, 240, .8);
  max-width: var(--measure);
}

.page-about .about-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  align-content: start;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 640px) {
  .page-about .eco-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
    gap: 2.4rem;
  }

  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
    gap: 2.4rem;
  }

  .page-about .records-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
    gap: 2.4rem;
  }

  .page-about .team-foot {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: center;
    gap: 2rem;
  }

  .page-about .about-cta-panel {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: center;
    gap: 2rem;
  }
}

@media (min-width: 960px) {
  .page-about .about-arc-grid {
    grid-template-columns: 11rem minmax(0, 1fr);
    gap: 2.8rem;
    align-items: start;
  }

  .page-about .year-index {
    position: sticky;
    top: 5.5rem;
    border-left: 1px solid var(--line-soft);
    padding-left: 1.1rem;
  }

  .page-about .year-index ul {
    flex-direction: column;
    align-items: stretch;
    gap: .2rem;
  }

  .page-about .about-check-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .check-steps {
    margin-top: 0;
  }
}

@media (min-width: 1024px) {
  .page-about .eco-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-crumbs a,
  .page-about .year-index a,
  .page-about .check-step summary {
    transition: none;
  }
}
<<<END>>>