.page-about {
  --about-lead: clamp(16px, 1.2vw, 19px);
  --about-block-gap: clamp(28px, 4vw, 48px);
  color: var(--white);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(16px, 2.4vw, 26px);
}
.page-about .about-crumb .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.page-about .about-crumb .breadcrumb li {
  display: inline-flex;
  align-items: center;
}
.page-about .about-crumb .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}
.page-about .about-crumb .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms ease, border-color 180ms ease;
}
.page-about .about-crumb .breadcrumb a:hover {
  color: var(--green);
  border-color: var(--green);
}
.page-about .about-crumb .breadcrumb [aria-current="page"] {
  color: var(--white);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(32px, 5vw, 72px) 0 clamp(36px, 5vw, 72px);
  border-bottom: 1px solid var(--line);
}
.page-about .about-hero::before {
  content: "2025";
  position: absolute;
  right: -8vw;
  bottom: -18vw;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(180px, 30vw, 480px);
  line-height: 0.78;
  letter-spacing: -0.04em;
  color: rgba(46, 107, 230, 0.07);
  pointer-events: none;
  user-select: none;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  top: clamp(32px, 5vw, 72px);
  width: clamp(56px, 8vw, 120px);
  height: 3px;
  background: var(--green);
}
.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: end;
}
.page-about .about-hero-main h1 {
  margin: 14px 0 22px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 72px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--white);
}
.page-about .about-hero-main .lede {
  max-width: 34em;
  font-size: var(--about-lead);
  line-height: 1.8;
  color: var(--muted);
  margin: 0 0 clamp(22px, 3vw, 32px);
}
.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero-panel {
  position: relative;
  padding: clamp(20px, 3vw, 32px);
  background: linear-gradient(170deg, rgba(17, 30, 51, 0.92), rgba(10, 18, 32, 0.86));
  border: 1px solid var(--line);
}
.page-about .about-hero-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 68px;
  height: 3px;
  background: var(--green);
}
.page-about .about-panel-index {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}
.page-about .about-hero-panel .stat {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  padding-bottom: clamp(16px, 2vw, 22px);
  border-bottom: 1px solid var(--line);
}
.page-about .about-hero-panel .stat-value {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(58px, 9vw, 92px);
  line-height: 0.86;
  letter-spacing: -0.02em;
}
.page-about .about-hero-panel .stat-label {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}
.page-about .about-facts {
  margin: 0;
  display: grid;
  gap: 11px;
}
.page-about .about-facts > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 14px;
  font-size: 14px;
}
.page-about .about-facts dt {
  color: var(--muted);
}
.page-about .about-facts dd {
  margin: 0;
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--white);
}

/* 章节索引 */
.page-about .about-toc {
  position: relative;
  z-index: 1;
  margin-top: clamp(32px, 4vw, 52px);
  padding-top: clamp(18px, 2.4vw, 26px);
  border-top: 1px solid var(--line);
}
.page-about .about-toc-label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}
.page-about .about-toc ol {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-toc a {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
  transition: color 180ms ease, border-color 180ms ease;
}
.page-about .about-toc a:hover {
  color: var(--green);
  border-color: var(--green);
}
.page-about .toc-idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--green-deep);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  position: relative;
  padding: clamp(48px, 7vw, 100px) 0;
  border-bottom: 1px solid var(--line);
}
.page-about .about-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(14px, 2.2vw, 26px);
  align-items: start;
  margin-bottom: var(--about-block-gap);
}
.page-about .about-head-idx {
  margin: 0;
  padding-top: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--green);
  white-space: nowrap;
  border-right: 1px solid var(--line);
  padding-right: clamp(14px, 2.2vw, 26px);
}
.page-about .about-head-body .section-title {
  margin: 8px 0 0;
}
.page-about .about-head-body .section-note {
  margin-top: 12px;
  max-width: 40em;
}

.page-about .about-figure {
  margin: 0;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
}
.page-about .about-figure .media-caption {
  margin-top: 12px;
  display: block;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 章节 01 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-block-gap);
  align-items: start;
}
.page-about .about-prose p {
  margin: 0 0 18px;
  font-size: var(--about-lead);
  line-height: 1.85;
  color: var(--muted);
}
.page-about .about-prose p:last-child {
  margin-bottom: 0;
}
.page-about .about-prose p:first-child::first-letter {
  float: left;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 3.1em;
  line-height: 0.86;
  margin: 6px 12px 0 0;
  color: var(--green);
}

/* ---------- 章节 02 ---------- */
.page-about .about-track {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-block-gap);
  align-items: start;
}
.page-about .about-tree {
  display: grid;
  gap: 2px;
  margin-bottom: var(--about-block-gap);
}
.page-about .tree-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 18px 20px;
  background: var(--panel);
  border-left: 3px solid var(--line);
}
.page-about .tree-row.tree-level-1 {
  border-left-color: var(--green);
}
.page-about .tree-row.tree-level-2 {
  border-left-color: var(--blue);
  margin-left: clamp(0px, 2.4vw, 36px);
}
.page-about .tree-row.tree-level-3 {
  border-left-color: var(--orange);
  margin-left: clamp(0px, 4.8vw, 72px);
}
.page-about .tree-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--white);
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--line);
}
.page-about .tree-desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-metric-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(12px, 1.6vw, 20px);
}
.page-about .metric-card {
  position: relative;
  padding: clamp(20px, 2.6vw, 30px);
  background: var(--panel);
  border-left: 3px solid var(--green);
}
.page-about .metric-card:nth-child(2) {
  border-left-color: var(--blue);
}
.page-about .metric-card:nth-child(3) {
  border-left-color: var(--orange);
}
.page-about .metric-idx {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}
.page-about .metric-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(18px, 2vw, 22px);
  color: var(--white);
  letter-spacing: -0.005em;
}
.page-about .metric-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-track-side {
  display: grid;
  gap: clamp(18px, 2.4vw, 26px);
}
.page-about .about-side-note {
  padding: 18px 20px;
  border: 1px solid var(--line);
  background: rgba(17, 30, 51, 0.5);
}
.page-about .about-side-label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--green);
}
.page-about .about-side-note p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 章节 03 ---------- */
.page-about .about-team-photo {
  margin: 0 0 var(--about-block-gap);
}
.page-about .about-team-photo img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
}
.page-about .about-team-photo .media-caption {
  margin-top: 12px;
  display: block;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}
.page-about .about-roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(12px, 1.6vw, 18px);
}
.page-about .role-card {
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--panel);
  border-top: 2px solid var(--green);
}
.page-about .role-card:nth-child(2) {
  border-top-color: var(--blue);
}
.page-about .role-card:nth-child(3) {
  border-top-color: var(--green-deep);
}
.page-about .role-card:nth-child(4) {
  border-top-color: var(--orange);
}
.page-about .role-idx {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}
.page-about .role-card h3 {
  margin: 0 0 9px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(16px, 1.7vw, 19px);
  color: var(--white);
}
.page-about .role-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .about-tempo {
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: clamp(18px, 2.4vw, 26px) clamp(18px, 2.4vw, 28px);
  background: linear-gradient(120deg, rgba(18, 183, 106, 0.09), rgba(46, 107, 230, 0.09));
  border-left: 3px solid var(--amber);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--white);
}
.page-about .about-tempo .idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--amber);
  margin-right: 10px;
}

/* ---------- 章节 04 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--line);
}
.page-about .timeline-item {
  position: relative;
  padding: 0 0 clamp(30px, 4vw, 46px) clamp(30px, 4.4vw, 52px);
}
.page-about .timeline-item:last-child {
  padding-bottom: 0;
}
.page-about .timeline-dot {
  position: absolute;
  left: 0;
  top: 4px;
  width: 13px;
  height: 13px;
  background: var(--night);
  border: 1px solid var(--line);
  transition: transform 200ms ease, background-color 200ms ease;
}
.page-about .timeline-dot.is-green {
  background: var(--green);
  border-color: var(--green);
}
.page-about .timeline-dot.is-orange {
  background: var(--orange);
  border-color: var(--orange);
}
.page-about .timeline-dot.is-blue {
  background: var(--blue);
  border-color: var(--blue);
}
.page-about .timeline-item:hover .timeline-dot {
  transform: scale(1.35);
}
.page-about .timeline-round {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
  transition: color 200ms ease;
}
.page-about .timeline-item:hover .timeline-round {
  color: var(--green);
}
.page-about .timeline-item h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(17px, 2.1vw, 23px);
  color: var(--white);
  letter-spacing: -0.005em;
  line-height: 1.4;
}
.page-about .timeline-item p:last-child {
  margin: 0;
  max-width: 44em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 章节 05 合作 ---------- */
.page-about .about-partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2vw, 22px);
}
.page-about .partner-card {
  padding: clamp(22px, 3vw, 32px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 3px solid var(--green);
}
.page-about .partner-card.is-blue {
  border-top-color: var(--blue);
}
.page-about .partner-card.is-orange {
  border-top-color: var(--orange);
}
.page-about .partner-count {
  margin: 0 0 6px;
  font-family: var(--font-num);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.page-about .partner-num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(44px, 6vw, 68px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--white);
  margin-right: 6px;
}
.page-about .partner-card.is-blue .partner-num {
  color: var(--blue);
}
.page-about .partner-card.is-orange .partner-num {
  color: var(--orange);
}
.page-about .partner-card h3 {
  margin: 10px 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(16px, 1.8vw, 20px);
  color: var(--white);
}
.page-about .partner-card p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .about-partner-close {
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding-top: clamp(18px, 2.4vw, 26px);
  border-top: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.85;
  color: var(--white);
}
.page-about .about-partner-close a {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid var(--green-deep);
  padding-bottom: 1px;
  transition: color 180ms ease, border-color 180ms ease;
}
.page-about .about-partner-close a:hover {
  color: var(--amber);
  border-color: var(--amber);
}

/* ---------- 结尾 ---------- */
.page-about .about-closing {
  padding: clamp(52px, 7vw, 104px) 0 clamp(60px, 8vw, 120px);
  background:
    linear-gradient(160deg, rgba(18, 58, 122, 0.28), rgba(10, 18, 32, 0) 62%),
    var(--night);
}
.page-about .about-closing-inner {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
  max-width: 62em;
}
.page-about .about-closing h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 46px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--white);
}
.page-about .about-closing p {
  margin: 0;
  max-width: 40em;
  font-size: var(--about-lead);
  line-height: 1.85;
  color: var(--muted);
}
.page-about .about-closing p a {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid var(--green-deep);
  padding-bottom: 1px;
  transition: color 180ms ease, border-color 180ms ease;
}
.page-about .about-closing p a:hover {
  color: var(--amber);
  border-color: var(--amber);
}
.page-about .about-closing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(8px, 1.4vw, 14px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .about-partner-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .tree-row {
    grid-template-columns: minmax(96px, 140px) 1fr;
    align-items: center;
  }
  .page-about .tree-label {
    border-bottom: none;
    padding-bottom: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(280px, 1fr);
  }
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }
  .page-about .about-metric-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .about-partner-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about .about-track {
    grid-template-columns: minmax(0, 1.6fr) minmax(280px, 1fr);
  }
  .page-about .about-track-side {
    position: sticky;
    top: 96px;
  }
  .page-about .about-roles {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .about-toc ol {
    gap: 12px 30px;
  }
}

@media (max-width: 480px) {
  .page-about .about-hero::before {
    font-size: 140px;
    right: -12vw;
  }
  .page-about .about-hero-actions .btn,
  .page-about .about-closing-actions .btn {
    flex: 1 1 100%;
    text-align: center;
  }
  .page-about .about-prose p:first-child::first-letter {
    font-size: 2.4em;
    margin-right: 8px;
  }
}
<<<END>>>