.page-about {
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-body);
  padding-bottom: 64px;
}

/* 面包屑 */
.page-about .breadcrumb {
  padding: 20px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
}
.page-about .breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
}
.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}
.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--ice);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--paper);
}

/* 通用小标签 */
.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--amber);
  margin: 0 0 18px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.page-about .eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--amber);
}

.page-about .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum";
}

/* 图片容器 */
.page-about .about-fig {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}
.page-about .about-fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.85) contrast(1.03);
}
.page-about .about-fig figcaption {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: .05em;
  color: var(--muted);
  background: var(--ink-soft);
  border-top: 1px solid var(--line);
}
.page-about .about-fig__idx {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 2;
  font-size: 11px;
  letter-spacing: .1em;
  padding: 3px 8px;
  background: rgba(10, 16, 24, .82);
  border: 1px solid var(--line);
  color: var(--ice);
}

/* 首屏 */
.page-about .about-hero {
  padding: 26px 0 52px;
  border-bottom: 1px solid var(--line);
}
.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}
.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(29px, 7vw, 44px);
  line-height: 1.18;
  letter-spacing: .01em;
  color: var(--paper);
  margin: 0 0 22px;
  max-width: 22ch;
}
.page-about .about-lead {
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
  margin: 0 0 30px;
  max-width: 60ch;
}
.page-about .about-kpi {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-kpi li {
  background: var(--panel);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.page-about .about-kpi .mono {
  font-size: 26px;
  line-height: 1;
  color: var(--ice);
}
.page-about .about-kpi li span:last-child {
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--muted);
}
.page-about .about-fig--portrait img {
  aspect-ratio: 3 / 4;
}

/* 章节通用 */
.page-about .about-band {
  padding: 52px 0;
  border-top: 1px solid var(--line);
}
.page-about .about-band--timeline {
  background: var(--ink-soft);
}
.page-about .about-band--links {
  border-bottom: 1px solid var(--line);
}
.page-about .section-head {
  margin-bottom: 30px;
  max-width: 62ch;
}
.page-about .section-head .chapter-no {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--amber);
  margin-bottom: 14px;
}
.page-about .section-head h2 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(22px, 4vw, 30px);
  line-height: 1.3;
  letter-spacing: .01em;
  color: var(--paper);
  margin: 0 0 12px;
}
.page-about .section-head p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* 三类服务 */
.page-about .scope-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .scope-card {
  background: var(--ink);
  padding: 24px 20px;
  transition: background .2s var(--ease);
}
.page-about .scope-card:hover {
  background: var(--panel);
}
.page-about .scope-idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  font-size: 13px;
  border: 1px solid var(--ice);
  color: var(--ice);
  margin-bottom: 16px;
}
.page-about .scope-card h3 {
  font-family: var(--font-head);
  font-size: 19px;
  letter-spacing: .01em;
  color: var(--paper);
  margin: 0 0 10px;
}
.page-about .scope-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
}

/* 发展历程 */
.page-about .stage-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .stage-item {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 18px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}
.page-about .stage-item:last-child {
  border-bottom: 1px solid var(--line);
}
.page-about .stage-year {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--amber);
  padding-top: 3px;
}
.page-about .stage-item h3 {
  font-family: var(--font-head);
  font-size: 18px;
  color: var(--paper);
  margin: 0 0 8px;
}
.page-about .stage-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
  max-width: 58ch;
}

/* 团队 */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .team-cell {
  background: var(--ink);
  padding: 22px 20px;
  transition: background .2s var(--ease);
}
.page-about .team-cell:hover {
  background: var(--panel);
}
.page-about .team-cell .mono {
  display: block;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--pine);
  margin-bottom: 10px;
}
.page-about .team-cell p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
}

/* 更新节奏 */
.page-about .updates-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-bottom: 32px;
}
.page-about .updates-item {
  border-left: 2px solid var(--amber);
  padding: 2px 0 2px 18px;
}
.page-about .updates-item .mono {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--amber);
}
.page-about .updates-item h3 {
  font-family: var(--font-head);
  font-size: 18px;
  color: var(--paper);
  margin: 6px 0 8px;
}
.page-about .updates-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
}

/* 用户 */
.page-about .audience-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-bottom: 24px;
}
.page-about .audience-col {
  background: var(--ink);
  padding: 24px 20px;
}
.page-about .audience-col h3 {
  font-family: var(--font-head);
  font-size: 17px;
  letter-spacing: .01em;
  color: var(--ice);
  margin: 0 0 10px;
}
.page-about .audience-col p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
}
.page-about .audience-tail {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}
.page-about .audience-tail a {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid var(--ice);
}
.page-about .audience-tail a:hover,
.page-about .audience-tail a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* 协作方 */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}
.page-about .partner-block {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 22px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
}
.page-about .partner-num {
  flex-shrink: 0;
  font-size: 44px;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--amber);
}
.page-about .partner-block p {
  margin: 0;
  padding-top: 6px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
}

/* 下一步 */
.page-about .link-row {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .link-row a {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 20px;
  background: var(--ink);
  color: var(--text);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.6;
  transition: background .2s var(--ease), color .2s var(--ease);
}
.page-about .link-row a:hover,
.page-about .link-row a:focus-visible {
  background: var(--panel);
  color: var(--paper);
}
.page-about .link-row .mono {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
  flex-shrink: 0;
  transition: color .2s var(--ease);
}
.page-about .link-row a:hover .mono,
.page-about .link-row a:focus-visible .mono {
  color: var(--amber);
}

/* 窄屏兜底 */
@media (max-width: 420px) {
  .page-about .about-kpi {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-about .stage-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }
  .page-about .partner-block {
    flex-direction: column;
    gap: 12px;
  }
}

/* 中等屏 */
@media (min-width: 720px) {
  .page-about {
    padding-bottom: 88px;
  }
  .page-about .about-hero {
    padding: 40px 0 64px;
  }
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
  }
  .page-about .about-kpi {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .scope-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .updates-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 32px;
  }
  .page-about .audience-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .link-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .stage-item {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 32px;
    padding: 26px 0;
  }
}

/* 桌面 */
@media (min-width: 1024px) {
  .page-about .about-band {
    padding: 72px 0;
  }
  .page-about .about-hero {
    padding: 56px 0 80px;
  }
  .page-about .team-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
  .page-about .link-row {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .scope-card,
  .page-about .team-cell,
  .page-about .audience-col {
    padding: 28px 24px;
  }
}
<<<END>>>