.page-about {
  --about-line: rgba(29, 124, 107, .45);
  --about-line-soft: rgba(143, 184, 168, .28);
  display: block;
  background: var(--ink-900);
  color: var(--paper);
  overflow-x: hidden;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + clamp(18px, 3vw, 40px)) 0 clamp(36px, 6vw, 76px);
  background:
    radial-gradient(120% 85% at 88% 6%, rgba(47, 243, 208, .16), transparent 62%),
    radial-gradient(90% 70% at 6% 96%, rgba(255, 106, 42, .12), transparent 60%),
    linear-gradient(158deg, var(--ink-950), var(--ink-800) 56%, var(--ink-900));
  border-bottom: var(--bd) solid var(--line);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--sage);
  margin-bottom: clamp(18px, 3vw, 30px);
}

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

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

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: end;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .16em;
  color: var(--orange);
  margin: 0 0 14px;
}

.page-about h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.3rem, 8vw, 5rem);
  line-height: .96;
  letter-spacing: -.02em;
  margin: 0 0 18px;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .lead {
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  line-height: 1.8;
  color: var(--sage);
  max-width: 46ch;
  margin: 0 0 clamp(20px, 3vw, 30px);
}

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

.page-about .hero-stats {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: var(--bd) solid var(--line);
  padding-top: 18px;
  gap: 16px 0;
}

.page-about .hero-stats li {
  padding-right: 10px;
}

.page-about .hs-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 4vw, 2.3rem);
  line-height: 1;
  color: var(--signal);
  letter-spacing: .01em;
}

.page-about .hero-stats li:nth-child(3) .hs-num {
  color: var(--orange);
}

.page-about .hs-label {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--sage);
}

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

.page-about .about-hero-figure .frame {
  box-shadow: var(--shadow);
  border: var(--bd) solid var(--line);
}

.page-about .frame-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--sage);
}

/* ---------- 主体分屏 ---------- */
.page-about .about-body {
  padding: clamp(36px, 6vw, 78px) 0 clamp(48px, 7vw, 92px);
  background:
    linear-gradient(180deg, var(--ink-900), var(--ink-950) 70%);
}

.page-about .about-layout {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-rail {
  border: var(--bd) solid var(--line);
  background: var(--ink-800);
  padding: 18px;
  box-shadow: var(--shadow-sm);
}

.page-about .rail-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  color: var(--orange);
  text-transform: uppercase;
}

.page-about .toc {
  display: grid;
  gap: 2px;
}

.page-about .toc-link {
  display: block;
  padding: 9px 10px 9px 12px;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .05em;
  color: var(--sage);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.page-about .toc-link:hover {
  color: var(--paper);
  background: rgba(47, 243, 208, .08);
}

.page-about .toc-link[aria-current="true"] {
  color: var(--signal);
  border-left-color: var(--signal);
  background: rgba(47, 243, 208, .1);
}

.page-about .rail-contact {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--about-line-soft);
}

.page-about .rail-contact-title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .14em;
  color: var(--orange);
}

.page-about .rail-contact-line {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--paper);
  word-break: break-all;
}

.page-about .rail-contact .btn {
  margin-top: 10px;
}

/* ---------- 档案章节 ---------- */
.page-about .dossier {
  scroll-margin-top: calc(var(--header-h) + 22px);
}

.page-about .dossier + .dossier {
  margin-top: clamp(38px, 6vw, 70px);
  padding-top: clamp(30px, 5vw, 52px);
  border-top: 1px solid var(--about-line);
}

.page-about .dossier-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
}

.page-about .dossier-num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px var(--orange);
  letter-spacing: .04em;
  line-height: 1;
}

.page-about .dossier h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  line-height: 1.12;
  letter-spacing: -.01em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .dossier-lead {
  margin: 0 0 clamp(20px, 3vw, 30px);
  font-size: .98rem;
  line-height: 1.85;
  color: var(--sage);
  max-width: 62ch;
}

.page-about .dossier h3 {
  margin: 0 0 6px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .dossier p {
  margin: 0 0 10px;
  font-size: .94rem;
  line-height: 1.8;
  color: var(--sage);
}

.page-about .dossier a {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 243, 208, .4);
}

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

/* 时间线 */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 24px 22px;
  border-left: var(--bd) solid var(--ink-700);
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--signal);
  border: 2px solid var(--ink-950);
}

.page-about .tl-item:nth-child(even)::before {
  background: var(--orange);
}

.page-about .tl-year {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--orange);
  padding: 3px 8px;
  border: 1px solid var(--about-line);
  background: rgba(255, 106, 42, .08);
}

/* 内容方法 */
.page-about .seg {
  margin-bottom: clamp(20px, 3vw, 28px);
}

.page-about .seg-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.page-about .seg-btn {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .06em;
  padding: 10px 16px;
  background: transparent;
  color: var(--sage);
  border: var(--bd) solid var(--line);
  cursor: pointer;
  transition: transform .18s var(--ease), background-color .18s var(--ease), color .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .seg-btn:hover {
  color: var(--paper);
  transform: translateY(-2px);
}

.page-about .seg-btn[aria-selected="true"] {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--ink-950);
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}

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

.page-about .method-panel {
  border: var(--bd) solid var(--line);
  background: var(--ink-800);
  padding: clamp(18px, 3vw, 26px);
  box-shadow: var(--shadow-sm);
}

.page-about .method-num {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .1em;
  color: var(--sage);
}

.page-about .method-num span {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.9rem, 5vw, 2.8rem);
  color: var(--signal);
  line-height: 1;
  margin-right: 6px;
  vertical-align: -4px;
}

.page-about .method-panel > p {
  margin: 0 0 14px;
  max-width: 58ch;
}

.page-about .method-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .method-points li {
  position: relative;
  padding-left: 18px;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .method-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 8px;
  height: 8px;
  background: var(--orange);
}

.page-about .method-figure,
.page-about .network-photo {
  margin: clamp(20px, 3vw, 28px) 0 0;
}

.page-about .method-figure .frame,
.page-about .network-photo .frame {
  border: var(--bd) solid var(--line);
  box-shadow: var(--shadow-sm);
}

/* 团队 */
.page-about .team-grid {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .team-card {
  border: var(--bd) solid var(--line);
  background: linear-gradient(165deg, var(--ink-800), var(--ink-900));
  padding: clamp(16px, 2.6vw, 22px);
  box-shadow: var(--shadow-sm);
  transition: transform .2s var(--ease), border-color .2s var(--ease);
}

.page-about .team-card:hover {
  border-color: var(--signal);
  transform: translateY(-3px);
}

.page-about .team-num {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.4rem, 6vw, 3.2rem);
  line-height: 1;
  color: var(--signal);
}

.page-about .team-card:nth-child(2) .team-num {
  color: var(--orange);
}

.page-about .team-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 12px 0 0;
  padding: 0;
}

.page-about .team-tags li {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .06em;
  color: var(--sage);
  border: 1px solid var(--about-line);
  padding: 3px 8px;
  background: rgba(47, 243, 208, .05);
}

/* 合作网络 */
.page-about .network-layout {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  align-items: start;
}

.page-about .network-figure {
  border: var(--bd) solid var(--line);
  background: radial-gradient(90% 80% at 50% 40%, rgba(47, 243, 208, .12), transparent 70%), var(--ink-950);
  padding: 10px;
}

.page-about .net-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .net-lines line {
  stroke: var(--line);
  stroke-width: 2;
  stroke-dasharray: 6 7;
}

.page-about .net-node circle {
  fill: var(--ink-800);
  stroke: var(--line);
  stroke-width: 2;
  transition: fill .2s var(--ease), stroke .2s var(--ease), stroke-width .2s var(--ease);
}

.page-about .net-node--core circle {
  fill: var(--ink-700);
  stroke: var(--orange);
  stroke-width: 3;
}

.page-about .net-node:hover circle,
.page-about .net-node:focus-visible circle {
  fill: var(--ink-700);
  stroke: var(--signal);
  stroke-width: 3;
}

.page-about .net-node {
  cursor: default;
  outline: none;
}

.page-about .net-name {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  fill: var(--paper);
}

.page-about .net-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .06em;
  fill: var(--sage);
}

.page-about .net-hint {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .04em;
  fill: var(--signal);
  opacity: 0;
  transition: opacity .2s var(--ease);
}

.page-about .net-node:hover .net-hint,
.page-about .net-node:focus-visible .net-hint {
  opacity: 1;
}

.page-about .network-notes h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: .02em;
  margin-bottom: 12px;
}

.page-about .network-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .network-list li {
  border-left: 3px solid var(--orange);
  padding-left: 12px;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--sage);
}

.page-about .network-list strong {
  display: block;
  color: var(--paper);
  font-size: .94rem;
  margin-bottom: 2px;
}

/* 荣誉 */
.page-about .award-grid {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  align-items: start;
}

.page-about .award-stamp {
  display: grid;
  align-content: center;
  gap: 8px;
  padding: clamp(20px, 4vw, 32px) clamp(16px, 3vw, 24px);
  text-align: center;
  background: var(--cream);
  color: var(--ink-950);
  border: var(--bd) solid var(--ink-950);
  box-shadow: var(--shadow);
  transform: rotate(-1.2deg);
}

.page-about .award-stamp::after {
  content: "";
  display: block;
  height: 0;
}

.page-about .stamp-year {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .22em;
  color: #8a4a1f;
}

.page-about .stamp-title {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 3.4vw, 1.7rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--ink-950);
}

.page-about .stamp-org {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  color: #4a5b50;
  padding-top: 8px;
  border-top: 1px dashed rgba(6, 28, 23, .3);
}

.page-about .award-body > p {
  max-width: 58ch;
}

.page-about .award-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .award-list li {
  border: 1px solid var(--about-line);
  padding: 10px 12px;
  background: rgba(47, 243, 208, .05);
  font-size: .88rem;
  line-height: 1.7;
  color: var(--sage);
}

.page-about .award-list strong {
  display: block;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--signal);
  margin-bottom: 3px;
}

/* 服务范围 */
.page-about .reach-boards {
  display: grid;
  gap: clamp(10px, 2vw, 16px);
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-bottom: clamp(18px, 3vw, 26px);
}

.page-about .reach-boards .board {
  border: var(--bd) solid var(--line);
  background: var(--ink-800);
  padding: 14px 12px;
  box-shadow: var(--shadow-sm);
}

.page-about .reach-boards .board-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  line-height: 1;
  color: var(--orange);
}

.page-about .reach-boards .board:nth-child(2) .board-num,
.page-about .reach-boards .board:nth-child(4) .board-num {
  color: var(--signal);
}

.page-about .reach-boards .board-label {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--sage);
}

.page-about .reach-note {
  max-width: 62ch;
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding: 0 0 clamp(48px, 7vw, 90px);
  background: var(--ink-950);
}

.page-about .cta-panel {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
  align-items: center;
  padding: clamp(22px, 4vw, 38px);
  border: var(--bd) solid var(--signal);
  background:
    linear-gradient(120deg, rgba(47, 243, 208, .12), transparent 58%),
    var(--ink-800);
  box-shadow: var(--shadow);
}

.page-about .cta-panel h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 4vw, 2.3rem);
  line-height: 1.1;
  color: var(--paper);
}

.page-about .cta-panel p {
  margin: 0;
  font-size: .94rem;
  line-height: 1.75;
  color: var(--sage);
  max-width: 46ch;
}

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

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .award-grid {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
  }
}

@media (min-width: 860px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
  }

  .page-about .about-layout {
    grid-template-columns: minmax(0, 250px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }

  .page-about .tl-item {
    display: grid;
    grid-template-columns: 100px minmax(0, 1fr);
    gap: 0 18px;
    padding-left: 24px;
  }

  .page-about .tl-year {
    justify-self: start;
    margin-bottom: 0;
  }

  .page-about .network-layout {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }

  .page-about .cta-panel {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 1080px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-layout {
    grid-template-columns: minmax(0, 280px) minmax(0, 1fr);
    gap: clamp(36px, 4vw, 64px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .toc-link,
  .page-about .seg-btn,
  .page-about .team-card,
  .page-about .net-node circle,
  .page-about .net-hint {
    transition: none;
  }

  .page-about .team-card:hover {
    transform: none;
  }

  .page-about .seg-btn:hover {
    transform: none;
  }
}