.page-about {
  --about-rule: rgba(217, 169, 59, .34);
  --about-card: #131B36;
  display: block;
  padding-bottom: clamp(56px, 8vw, 96px);
}

/* ---------- 面包屑与首屏 ---------- */
.page-about .about-crumb {
  padding-top: clamp(16px, 2.6vw, 26px);
}

.page-about .about-masthead {
  position: relative;
  padding: clamp(22px, 3.6vw, 42px) 0 clamp(26px, 4vw, 42px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-masthead::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: clamp(72px, 13vw, 168px);
  height: 3px;
  background: linear-gradient(90deg, var(--gold), var(--cinnabar) 68%, transparent);
}

.page-about .about-title {
  margin: 14px 0 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(29px, 5.2vw, 54px);
  line-height: 1.18;
  letter-spacing: .04em;
  color: var(--white);
}

.page-about .about-lead {
  margin: 18px 0 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.55vw, 17px);
  line-height: 1.9;
  color: var(--muted);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 3.6vw, 36px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-hard);
}

.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
  padding: 15px 18px;
  background: var(--ink-2);
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(21px, 2.7vw, 31px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold-soft);
}

.page-about .stat-label {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}

/* ---------- 左轨 + 连续画布 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
  padding-top: clamp(30px, 4.6vw, 54px);
}

.page-about .about-rail {
  align-self: start;
  min-width: 0;
}

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

.page-about .about-section {
  padding-top: clamp(34px, 5vw, 62px);
  margin-top: clamp(34px, 5vw, 62px);
  border-top: 1px solid var(--line);
}

.page-about .about-section:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-about .about-sec-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: clamp(12px, 1.8vw, 20px);
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-size: clamp(25px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .06em;
  color: rgba(217, 169, 59, .2);
  -webkit-text-stroke: 1px var(--gold);
}

@supports not (-webkit-text-stroke: 1px #000) {
  .page-about .about-num {
    color: var(--gold);
  }
}

.page-about .about-sec-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(21px, 2.85vw, 32px);
  line-height: 1.3;
  letter-spacing: .04em;
  color: var(--white);
}

.page-about .about-sec-lead {
  margin: clamp(14px, 2vw, 20px) 0 0;
  max-width: 68ch;
  font-size: clamp(14.5px, 1.5vw, 16.5px);
  line-height: 1.9;
  color: var(--muted);
}

.page-about .inline-link {
  color: var(--gold-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--about-rule);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  color: var(--white);
  border-bottom-color: var(--gold);
}

.page-about .num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--gold-soft);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: clamp(22px, 3.4vw, 34px) 0 0;
}

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

.page-about .about-figure--narrow {
  max-width: 440px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .tl-node {
  position: relative;
  min-width: 0;
  padding: 0 0 clamp(22px, 3vw, 30px) 34px;
}

.page-about .tl-node:last-child {
  padding-bottom: 0;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 20px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, rgba(217, 169, 59, .55), var(--line));
}

.page-about .tl-node:last-child::before {
  display: none;
}

.page-about .tl-dot {
  position: absolute;
  left: 0;
  top: 4px;
  width: 18px;
  height: 18px;
  background: var(--ink);
  border: 2px solid var(--gold);
  box-shadow: 0 0 0 4px rgba(10, 16, 36, .92);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .tl-node.is-key .tl-dot {
  background: var(--gold);
}

.page-about .tl-node:hover .tl-dot {
  background: var(--gold-soft);
  transform: scale(1.14);
}

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

.page-about .tl-year {
  display: inline-block;
  margin-bottom: 8px;
  padding-bottom: 3px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: .08em;
  color: var(--gold-soft);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .tl-title {
  margin: 0;
  font-size: clamp(16px, 1.7vw, 18px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--white);
}

.page-about .tl-text {
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 四象限职能矩阵 ---------- */
.page-about .matrix {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: clamp(24px, 3.4vw, 36px);
}

.page-about .matrix-cell {
  position: relative;
  min-width: 0;
  padding: clamp(20px, 2.6vw, 28px);
  background: var(--about-card);
  border: 1px solid var(--line);
  border-left: 4px solid var(--gold);
  box-shadow: var(--shadow-hard);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .matrix-cell--jade {
  border-left-color: var(--jade);
}

.page-about .matrix-cell--cinnabar {
  border-left-color: var(--cinnabar);
}

.page-about .matrix-cell--soft {
  border-left-color: var(--gold-soft);
}

.page-about .matrix-cell:hover,
.page-about .matrix-cell:focus-within {
  transform: translate(-3px, -3px);
  border-color: var(--gold);
  box-shadow: 10px 10px 0 rgba(0, 0, 0, .5);
}

.page-about .matrix-cell--jade:hover,
.page-about .matrix-cell--jade:focus-within {
  border-color: var(--jade);
}

.page-about .matrix-cell--cinnabar:hover,
.page-about .matrix-cell--cinnabar:focus-within {
  border-color: var(--cinnabar);
}

.page-about .matrix-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 21px);
  letter-spacing: .04em;
  color: var(--white);
}

.page-about .matrix-role {
  margin: 8px 0 0;
  font-size: 13.5px;
  letter-spacing: .03em;
  color: var(--jade);
}

.page-about .matrix-cell--gold .matrix-role {
  color: var(--gold-soft);
}

.page-about .matrix-cell--cinnabar .matrix-role {
  color: var(--cinnabar);
}

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

.page-about .matrix-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .matrix-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  background: var(--gold);
}

.page-about .matrix-cell--jade .matrix-list li::before {
  background: var(--jade);
}

.page-about .matrix-cell--cinnabar .matrix-list li::before {
  background: var(--cinnabar);
}

.page-about .matrix-cell--soft .matrix-list li::before {
  background: var(--gold-soft);
}

/* ---------- 折叠接力说明 ---------- */
.page-about .handoff {
  margin-top: clamp(26px, 3.8vw, 40px);
  border-top: 1px solid var(--line);
  padding-top: clamp(18px, 2.6vw, 26px);
}

.page-about .handoff-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .handoff-item + .handoff-item {
  margin-top: 10px;
}

/* ---------- 栏目行列表 ---------- */
.page-about .cat-list {
  margin: clamp(22px, 3.2vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .cat-row {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 12px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
  transition: background var(--dur) var(--ease);
}

.page-about .cat-row:hover {
  background: rgba(19, 27, 54, .62);
}

.page-about .cat-idx {
  grid-row: span 2;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--gold);
}

.page-about .cat-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}

.page-about .cat-desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 四步工序 ---------- */
.page-about .flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow-step {
  position: relative;
  min-width: 0;
  padding: 20px 18px 22px;
  background: linear-gradient(180deg, rgba(19, 27, 54, .96), rgba(10, 16, 36, .96));
  border: 1px solid var(--line);
  border-top: 3px solid var(--gold);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .flow-step:hover {
  transform: translateY(-3px);
  border-color: var(--gold);
}

.page-about .flow-idx {
  display: inline-block;
  margin-bottom: 12px;
  padding: 2px 7px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--gold-soft);
  border: 1px solid var(--about-rule);
}

.page-about .flow-title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}

.page-about .flow-text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .rhythm-note {
  margin-top: clamp(20px, 2.8vw, 28px);
}

/* ---------- 合作方向横向抽屉 ---------- */
.page-about .partner-track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(0, 250px);
  gap: 16px;
  margin-top: clamp(24px, 3.4vw, 36px);
  padding: 4px 4px 18px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .partner-track::-webkit-scrollbar {
  height: 6px;
}

.page-about .partner-track::-webkit-scrollbar-track {
  background: var(--line);
}

.page-about .partner-track::-webkit-scrollbar-thumb {
  background: var(--gold);
}

.page-about .partner-track:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 4px;
}

.page-about .partner-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  scroll-snap-align: start;
  min-width: 0;
  padding: 20px;
  background: var(--about-card);
  border: 1px solid var(--line);
  border-top: 3px solid var(--jade);
}

.page-about .partner-card:nth-child(2) {
  border-top-color: var(--gold);
}

.page-about .partner-card:nth-child(3) {
  border-top-color: var(--gold-soft);
}

.page-about .partner-card:nth-child(4) {
  border-top-color: var(--cinnabar);
}

.page-about .partner-title {
  margin: 0;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--white);
}

.page-about .partner-count {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

.page-about .partner-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 荣誉条 ---------- */
.page-about .honor {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 22px;
  margin-top: clamp(22px, 3vw, 30px);
  padding: 18px 20px;
  border: 1px solid var(--about-rule);
  background: linear-gradient(118deg, rgba(217, 169, 59, .1), rgba(200, 64, 47, .06) 62%, transparent);
}

.page-about .honor-years {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(15px, 1.9vw, 19px);
  letter-spacing: .1em;
  color: var(--gold-soft);
}

.page-about .honor-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 联系入口 ---------- */
.page-about .contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: clamp(24px, 3.4vw, 34px);
}

.page-about .contact-card {
  min-width: 0;
  padding: clamp(20px, 2.6vw, 28px);
  background: var(--about-card);
  border: 1px solid var(--line);
}

.page-about .contact-card--primary {
  border-color: rgba(200, 64, 47, .52);
  background: linear-gradient(150deg, rgba(200, 64, 47, .13), var(--about-card) 58%);
}

.page-about .contact-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.05vw, 22px);
  letter-spacing: .04em;
  color: var(--white);
}

.page-about .contact-text {
  margin: 0 0 18px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

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

.page-about .contact-list li {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 10px;
  font-size: 14.5px;
  line-height: 1.75;
}

.page-about .contact-key {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--gold);
}

.page-about .contact-val {
  color: var(--white);
  word-break: break-word;
}

.page-about .contact-note {
  margin-top: clamp(20px, 2.8vw, 28px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .matrix {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .cat-row {
    grid-template-columns: 52px minmax(0, 1fr) minmax(0, 1.4fr);
    align-items: baseline;
    gap: 6px 18px;
  }

  .page-about .cat-idx {
    grid-row: auto;
  }

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

  .page-about .partner-track {
    grid-auto-columns: minmax(0, 280px);
  }
}

@media (min-width: 900px) {
  .page-about .about-layout {
    grid-template-columns: var(--rail) minmax(0, 1fr);
    gap: clamp(36px, 4.6vw, 64px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .timeline {
    flex-direction: row;
    align-items: flex-start;
  }

  .page-about .tl-node {
    flex: 1 1 0;
    padding: 0 20px 0 0;
  }

  .page-about .tl-node:last-child {
    padding-right: 0;
  }

  .page-about .tl-node::before {
    left: 0;
    right: 0;
    top: 21px;
    bottom: auto;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, rgba(217, 169, 59, .55), var(--line));
  }

  .page-about .tl-node:last-child::before {
    display: block;
    background: linear-gradient(90deg, rgba(217, 169, 59, .55), transparent);
  }

  .page-about .tl-dot {
    left: 0;
    top: 13px;
  }

  .page-about .tl-body {
    padding-top: 44px;
  }

  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 1180px) {
  .page-about .timeline {
    padding-right: 8px;
  }

  .page-about .tl-node {
    padding-right: 26px;
  }

  .page-about .tl-node:last-child {
    padding-right: 0;
  }
}
<<<END>>>