.page-about {
  --about-pad: clamp(1.25rem, 5vw, 4rem);
  --about-line: rgba(183, 121, 60, 0.3);
  background: var(--paper);
  color: var(--black);
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-about .container {
  width: min(100% - 2.5rem, 1180px);
  margin-inline: auto;
}

.page-about .section {
  padding-block: clamp(2.75rem, 6vw, 5rem);
}

.page-about h2 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1.65rem, 3.4vw, 2.5rem);
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--ink-deep);
  margin: 0.55rem 0 1rem;
}

.page-about .eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--copper);
  margin: 0;
}

.page-about .about-section-lead {
  max-width: 62ch;
  line-height: 1.8;
  color: rgba(26, 26, 22, 0.78);
  margin: 0;
}

.page-about .media-frame {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: var(--r-lg);
  background: var(--paper-grey);
}

.page-about .media-frame figcaption {
  position: absolute;
  left: 0.9rem;
  bottom: 0.9rem;
  padding: 0.35rem 0.8rem;
  border-radius: var(--r-pill);
  background: rgba(11, 36, 31, 0.72);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
}

/* 首屏 */
.page-about .about-hero {
  padding-top: clamp(1.25rem, 3vw, 2.25rem);
}

.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0 0 1.75rem;
  padding: 0;
  list-style: none;
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .crumbs li + li::before {
  content: "/";
  margin-right: 0.45rem;
  color: var(--copper-light);
}

.page-about .crumbs a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

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

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: end;
}

.page-about .about-hero h1 {
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(2.1rem, 6vw, 4rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink-deep);
  margin: 0.6rem 0 1.1rem;
}

.page-about .about-lead {
  max-width: 56ch;
  font-size: clamp(1rem, 1.3vw, 1.1rem);
  line-height: 1.85;
  color: rgba(26, 26, 22, 0.8);
  margin: 0;
}

.page-about .about-hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem 2rem;
  margin: 1.6rem 0;
  padding-top: 1.2rem;
  border-top: var(--hairline);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.page-about .about-fact-num {
  font-size: 1.55rem;
  line-height: 1;
  color: var(--copper);
  letter-spacing: 0.02em;
}

.page-about .about-fact-label {
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--ink);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  align-items: center;
}

.page-about .about-hero-fig img {
  width: 100%;
  aspect-ratio: 5 / 4;
  object-fit: cover;
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 2.2rem;
  padding-top: 1.1rem;
  border-top: var(--hairline);
}

.page-about .about-jump a {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--about-line);
  border-radius: var(--r-pill);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--ink);
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

/* 时间轴 */
.page-about .about-timeline-section {
  background: var(--paper-grey);
  border-block: var(--hairline);
}

.page-about .about-timeline {
  display: flex;
  gap: 0.9rem;
  margin-top: 2rem;
  padding: 0 var(--about-pad) 1.4rem;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scrollbar-color: var(--copper-light) transparent;
  scrollbar-width: thin;
}

.page-about .tl-photo {
  position: relative;
  flex: 0 0 min(70vw, 280px);
  margin: 0;
  border-radius: var(--r-md);
  overflow: hidden;
  scroll-snap-align: start;
  background: var(--ink);
}

.page-about .tl-photo img {
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}

.page-about .tl-photo figcaption {
  position: absolute;
  left: 0.75rem;
  bottom: 0.75rem;
  padding: 0.3rem 0.7rem;
  border-radius: var(--r-pill);
  background: rgba(11, 36, 31, 0.72);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
}

.page-about .tl-card {
  flex: 0 0 min(74vw, 290px);
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding: 1.15rem 1.2rem 1.3rem;
  background: var(--paper);
  border: var(--hairline);
  border-radius: var(--r-md);
  scroll-snap-align: start;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .tl-card:hover {
  border-color: var(--copper);
  transform: translateY(-2px);
}

.page-about .tl-year {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.3rem;
  color: var(--ink);
  letter-spacing: 0.04em;
}

.page-about .tl-year::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--copper);
  box-shadow: 0 0 0 4px rgba(183, 121, 60, 0.18);
  transition: transform 0.2s ease;
}

.page-about .tl-card:hover .tl-year::before,
.page-about .tl-card:focus-within .tl-year::before {
  transform: scale(1.15);
}

.page-about .tl-card h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.12rem;
  font-weight: 600;
  color: var(--ink-deep);
}

.page-about .tl-card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: rgba(26, 26, 22, 0.75);
}

.page-about .about-timeline-foot {
  margin: 1.2rem 0 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: rgba(26, 26, 22, 0.7);
}

.page-about .about-timeline-foot a,
.page-about .team-help a,
.page-about .network-note a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--copper);
  padding-bottom: 1px;
  transition: color 0.2s ease;
}

.page-about .about-timeline-foot a:hover,
.page-about .team-help a:hover,
.page-about .network-note a:hover {
  color: var(--copper);
}

/* 空间 */
.page-about .about-space {
  background: var(--ink);
  color: var(--paper);
}

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

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

.page-about .about-section-lead--dark {
  color: rgba(246, 241, 231, 0.82);
}

.page-about .about-space-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
  margin-top: 2rem;
}

.page-about .space-stat {
  padding: 1.2rem 1.15rem 1.3rem;
  border: 1px solid rgba(216, 167, 106, 0.32);
  border-radius: var(--r-md);
  background: rgba(246, 241, 231, 0.04);
}

.page-about .space-num {
  display: block;
  font-size: clamp(2rem, 4.6vw, 2.9rem);
  line-height: 1;
  color: var(--copper-light);
}

.page-about .space-unit {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: rgba(246, 241, 231, 0.66);
}

.page-about .space-stat h3 {
  margin: 0.85rem 0 0.4rem;
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--paper);
}

.page-about .space-stat p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.72;
  color: rgba(246, 241, 231, 0.76);
}

.page-about .space-more {
  margin-top: 1.4rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(216, 167, 106, 0.3);
}

.page-about .space-more summary {
  cursor: pointer;
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--copper-light);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.page-about .space-more summary::after {
  content: "+";
  font-size: 1rem;
  line-height: 1;
  color: var(--copper-light);
}

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

.page-about .space-more p {
  margin: 0.75rem 0 0;
  max-width: 68ch;
  font-size: 0.9rem;
  line-height: 1.78;
  color: rgba(246, 241, 231, 0.8);
}

/* 团队 */
.page-about .about-team-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: center;
}

.page-about .about-team-fig img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
  margin-top: 2rem;
}

.page-about .team-cell {
  padding: 1.05rem 1.1rem 1.15rem;
  border: var(--hairline);
  border-radius: var(--r-md);
  background: var(--paper);
}

.page-about .team-num {
  display: block;
  font-size: clamp(1.7rem, 3.4vw, 2.4rem);
  line-height: 1;
  color: var(--copper);
}

.page-about .team-cell h3 {
  margin: 0.6rem 0 0.35rem;
  font-family: var(--serif);
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--ink-deep);
}

.page-about .team-cell p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.7;
  color: rgba(26, 26, 22, 0.75);
}

.page-about .team-cell--total {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.5rem;
  background: var(--ink);
  border-color: transparent;
}

.page-about .team-cell--total .team-num {
  color: var(--copper-light);
  font-size: clamp(2.4rem, 5vw, 3.2rem);
}

.page-about .team-total-copy h3 {
  color: var(--paper);
  margin-top: 0;
}

.page-about .team-total-copy p {
  color: rgba(246, 241, 231, 0.78);
  max-width: 52ch;
}

.page-about .team-cell--note {
  background: var(--paper-grey);
  border-color: transparent;
}

.page-about .team-help {
  margin: 1.5rem 0 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: rgba(26, 26, 22, 0.7);
}

/* 资质 */
.page-about .about-trust {
  background: var(--paper-grey);
  border-block: var(--hairline);
}

.page-about .trust-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
  margin: 1.8rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .trust-item {
  padding: 1.15rem 1.1rem 1.25rem;
  background: var(--paper);
  border-radius: var(--r-md);
  border-left: 3px solid var(--copper);
}

.page-about .trust-item h3 {
  margin: 0.6rem 0 0.4rem;
  font-family: var(--serif);
  font-size: 1.06rem;
  font-weight: 600;
  color: var(--ink-deep);
}

.page-about .trust-item p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.74;
  color: rgba(26, 26, 22, 0.76);
}

.page-about .trust-note {
  margin: 1.4rem 0 0;
  padding-top: 1rem;
  border-top: var(--hairline);
  font-size: 0.88rem;
  line-height: 1.76;
  color: rgba(26, 26, 22, 0.72);
}

/* 网络 */
.page-about .about-network-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: start;
}

.page-about .network-note {
  margin: 1.1rem 0 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: rgba(26, 26, 22, 0.74);
}

.page-about .network-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.8rem;
}

.page-about .network-stat {
  padding: 1rem 1.1rem 1.1rem;
  border: var(--hairline);
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(232, 225, 212, 0.55), rgba(246, 241, 231, 0.9));
}

.page-about .network-num {
  display: block;
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  line-height: 1;
  color: var(--ink);
}

.page-about .network-stat p {
  margin: 0.5rem 0 0;
  font-size: 0.85rem;
  line-height: 1.68;
  color: rgba(26, 26, 22, 0.74);
}

/* 承诺 */
.page-about .about-commit-card {
  padding: clamp(1.6rem, 4.5vw, 3.2rem);
  border-radius: var(--r-lg);
  background: var(--ink-deep);
  color: var(--paper);
  box-shadow: 0 18px 40px rgba(11, 36, 31, 0.18);
}

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

.page-about .about-commit-card h2 {
  color: var(--paper);
}

.page-about .about-commit-card p {
  max-width: 66ch;
  margin: 0;
  font-size: clamp(0.95rem, 1.2vw, 1.05rem);
  line-height: 1.85;
  color: rgba(246, 241, 231, 0.84);
}

.page-about .about-commit-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.4rem;
  margin-top: 1.6rem;
}

.page-about .about-link {
  color: var(--copper-light);
  text-decoration: none;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--copper-light);
}

.page-about .about-top {
  display: inline-block;
  margin-top: 1.4rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--about-line);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-top:hover,
.page-about .about-top:focus-visible {
  color: var(--copper);
  border-bottom-color: var(--copper);
}

.page-about :focus-visible {
  outline: 2px solid var(--copper);
  outline-offset: 3px;
}

@media (min-width: 720px) {
  .page-about .about-space-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .space-stat--wide {
    grid-column: span 2;
  }

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

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

  .page-about .tl-photo {
    flex: 0 0 300px;
  }

  .page-about .tl-card {
    flex: 0 0 300px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: clamp(2rem, 4vw, 4rem);
  }

  .page-about .about-hero-fig img {
    aspect-ratio: 8 / 5;
  }

  .page-about .about-team-head {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(1.5rem, 4vw, 3rem);
  }

  .page-about .about-team-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .team-cell--total {
    grid-column: span 12;
  }

  .page-about .team-cell--ops {
    grid-column: span 5;
  }

  .page-about .team-cell--plan {
    grid-column: span 3;
  }

  .page-about .team-cell--service {
    grid-column: span 4;
  }

  .page-about .team-cell--tech {
    grid-column: span 4;
  }

  .page-about .team-cell--other {
    grid-column: span 4;
  }

  .page-about .team-cell--note {
    grid-column: span 4;
  }

  .page-about .about-network-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-about .network-stats {
    grid-template-columns: 1fr;
    gap: 0.7rem;
  }

  .page-about .network-stat:nth-child(2) {
    margin-left: 1.5rem;
  }

  .page-about .network-stat:nth-child(3) {
    margin-left: 0.75rem;
  }
}

@media (min-width: 1100px) {
  .page-about .about-space-grid {
    grid-template-columns: 1.25fr 1fr 1fr;
  }

  .page-about .space-stat--wide {
    grid-column: span 1;
    grid-row: span 2;
  }
}
</main>