.page-about {
  --about-line: rgba(169, 180, 196, 0.18);
  --about-line-strong: rgba(169, 180, 196, 0.32);
  --about-cyan-soft: rgba(53, 242, 194, 0.14);
  --about-orange-soft: rgba(255, 122, 26, 0.14);
  color: var(--paper);
  background: var(--ink-0);
}

/* 面包屑 */
.page-about .breadcrumbs {
  padding-top: clamp(16px, 2.6vw, 28px);
}
.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}
.page-about .breadcrumbs__list li {
  display: flex;
  align-items: center;
  gap: 8px;
}
.page-about .breadcrumbs__link {
  color: var(--metal);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.page-about .breadcrumbs__link:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}
.page-about .breadcrumbs__sep {
  color: var(--line-soft);
}
.page-about .breadcrumbs__current {
  color: var(--paper);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 3.6vw, 40px) 0 clamp(32px, 5vw, 68px);
  border-bottom: 1px solid var(--line);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -8% auto -8%;
  height: 130%;
  background:
    radial-gradient(58% 58% at 16% 26%, rgba(53, 242, 194, 0.13), transparent 70%),
    radial-gradient(48% 48% at 88% 6%, rgba(255, 122, 26, 0.12), transparent 70%);
  pointer-events: none;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--about-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-line) 1px, transparent 1px);
  background-size: 76px 76px;
  opacity: 0.3;
  pointer-events: none;
}
.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 46px);
}
.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.95rem, 5.2vw, 3.9rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  max-width: 22ch;
}
.page-about .about-hero .lede {
  margin: 18px 0 0;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: var(--metal);
  max-width: 58ch;
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}
.page-about .about-hero__visual {
  position: relative;
  display: grid;
  gap: 16px;
  padding: clamp(16px, 2.4vw, 26px);
  border: 1px solid var(--line);
  background: linear-gradient(158deg, rgba(14, 23, 38, 0.94), rgba(7, 11, 20, 0.72));
  clip-path: polygon(0 0, 100% 0, 100% 89%, 93% 100%, 0 100%);
}
.page-about .about-hero__svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}
.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 14px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}
.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}
.page-about .stat-num {
  font-family: var(--mono);
  font-size: clamp(1.15rem, 2.6vw, 1.9rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--cyan);
  line-height: 1.1;
}
.page-about .stat-num--sm {
  font-size: clamp(0.9rem, 1.8vw, 1.25rem);
}
.page-about .stat-label {
  font-size: 11px;
  line-height: 1.45;
  color: var(--mist);
}

/* 目录条 */
.page-about .about-toc {
  border-bottom: 1px solid var(--line);
  background: rgba(14, 23, 38, 0.6);
}
.page-about .about-toc__inner {
  display: flex;
  align-items: center;
  gap: 6px;
  padding-top: 12px;
  padding-bottom: 12px;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .about-toc__label {
  flex: none;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--mist);
  text-transform: uppercase;
  padding-right: 6px;
  border-right: 1px solid var(--line);
  margin-right: 4px;
}
.page-about .about-toc__inner a {
  flex: none;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--metal);
  text-decoration: none;
  padding: 5px 11px;
  border: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.page-about .about-toc__inner a:hover,
.page-about .about-toc__inner a:focus-visible {
  color: var(--ink-0);
  background: var(--cyan);
  border-color: var(--cyan);
  outline: none;
}

/* 分区基础 */
.page-about .about-block {
  padding: clamp(40px, 6vw, 86px) 0;
  border-bottom: 1px solid var(--line);
}
.page-about .about-block--indigo {
  background: linear-gradient(176deg, #241b4b 0%, #171034 56%, var(--ink-0) 100%);
}
.page-about .about-block--teal {
  background: linear-gradient(180deg, #0b2b33 0%, #08191f 62%, var(--ink-0) 100%);
}
.page-about .about-block--wine {
  background: linear-gradient(180deg, #4a1624 0%, #2b0d16 66%, var(--ink-0) 100%);
}
.page-about .about-split {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
}
.page-about .side-rail {
  border-top: 1px solid var(--cyan);
  padding-top: 12px;
}
.page-about .side-rail__num {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}
.page-about .side-rail__label {
  margin: 8px 0 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--paper);
}
.page-about .side-rail__note {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--metal);
}
.page-about .about-body > h2 {
  margin: 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.1vw, 2.5rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  max-width: 24ch;
}
.page-about .about-body > .lede {
  margin: 14px 0 0;
  font-size: clamp(14px, 1.6vw, 16px);
  line-height: 1.85;
  color: var(--metal);
  max-width: 62ch;
}
.page-about .about-head {
  max-width: 760px;
  margin-bottom: clamp(18px, 3vw, 30px);
}
.page-about .about-head > h2 {
  margin: 10px 0 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.1vw, 2.5rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
}
.page-about .about-head > .lede {
  margin: 14px 0 0;
  font-size: clamp(14px, 1.6vw, 16px);
  line-height: 1.85;
  color: var(--metal);
}
.page-about .prose {
  margin-top: 18px;
}
.page-about .prose p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--metal);
}
.page-about .prose p:last-child {
  margin-bottom: 0;
}
.page-about .about-points {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .about-points li {
  position: relative;
  padding: 10px 0 10px 18px;
  border-top: 1px dashed var(--about-line);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--metal);
}
.page-about .about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 14px;
  background: var(--orange);
}
.page-about .note {
  margin: 20px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}
.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 194, 0.5);
  padding-bottom: 1px;
}
.page-about .about-inline-link:hover {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* 图片容器 */
.page-about .img-frame {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-1);
}
.page-about .img-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .img-frame__caption {
  display: block;
  padding: 10px 12px;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist);
}
.page-about .about-team__figure {
  margin-top: clamp(22px, 3.4vw, 34px);
}

/* 团队筛选与卡片 */
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 4px 0 22px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.page-about .filter-btn {
  appearance: none;
  background: transparent;
  border: 1px solid var(--about-line-strong);
  color: var(--metal);
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.04em;
  padding: 7px 13px;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.page-about .filter-btn:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}
.page-about .filter-btn[aria-pressed="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-0);
  font-weight: 700;
}
.page-about .filter-count {
  margin: 0 0 0 auto;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}
.page-about .team-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 20px 18px 22px;
  border: 1px solid var(--line);
  background: rgba(7, 11, 20, 0.58);
  transition: border-color 0.2s ease, transform 0.25s ease;
}
.page-about .team-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 42px;
  height: 2px;
  background: var(--cyan);
}
.page-about .team-card:hover {
  border-color: rgba(53, 242, 194, 0.45);
}
.page-about .team-card[hidden] {
  display: none;
}
.page-about .team-card__head {
  display: flex;
  align-items: baseline;
  gap: 6px;
}
.page-about .team-card__num {
  font-family: var(--mono);
  font-size: 1.55rem;
  font-weight: 600;
  line-height: 1;
  color: var(--orange);
}
.page-about .team-card__unit {
  font-size: 11px;
  color: var(--mist);
}
.page-about .team-card h3 {
  margin: 0;
  font-family: var(--sans);
  font-weight: 800;
  font-size: 1.02rem;
  letter-spacing: 0.01em;
  color: var(--paper);
}
.page-about .team-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--metal);
}
.page-about .team-card__tag {
  order: -1;
  align-self: flex-start;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--mist);
  border: 1px solid var(--about-line);
  padding: 3px 8px;
  margin-bottom: 2px;
}

/* 发展历程 */
.page-about .timeline {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}
.page-about .phase {
  position: relative;
  padding: 16px 0 0;
  border-top: 1px solid var(--about-line-strong);
  outline: none;
}
.page-about .phase:focus-visible {
  border-top-color: var(--cyan);
}
.page-about .phase__index {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--orange);
}
.page-about .phase__title {
  margin: 8px 0 0;
  font-family: var(--sans);
  font-weight: 800;
  font-size: 1.08rem;
  color: var(--paper);
}
.page-about .phase__summary {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--metal);
}
.page-about .phase__extra {
  margin: 8px 0 0;
  padding-left: 10px;
  border-left: 2px solid var(--cyan);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--cyan);
}
.page-about .timeline + .img-frame {
  margin-top: clamp(22px, 3.4vw, 34px);
}

/* 内容运营方法 */
.page-about .method-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}
.page-about .method-item {
  display: grid;
  gap: 6px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}
.page-about .method-item__num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}
.page-about .method-item h3 {
  margin: 0;
  font-family: var(--sans);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--paper);
}
.page-about .method-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--metal);
}

/* 区域协作 */
.page-about .network-grid {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
  margin-top: 22px;
}
.page-about .network-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}
.page-about .network-stat {
  background: rgba(7, 11, 20, 0.62);
  padding: 16px 16px 18px;
  display: grid;
  gap: 6px;
}
.page-about .network-stat .stat-num {
  color: var(--paper);
}
.page-about .network-stat p {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--metal);
}

/* 服务与联系 */
.page-about .about-service__inner {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}
.page-about .about-service__copy > h2 {
  margin: 10px 0 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.1vw, 2.5rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  max-width: 22ch;
}
.page-about .about-service__copy > .lede {
  margin: 14px 0 0;
  font-size: clamp(14px, 1.6vw, 16px);
  line-height: 1.85;
  color: var(--metal);
  max-width: 52ch;
}
.page-about .about-service__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}
.page-about .about-service__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}
.page-about .about-service__item {
  background: rgba(7, 11, 20, 0.6);
  padding: 16px 16px 18px;
  display: grid;
  gap: 8px;
  justify-items: start;
}
.page-about .about-service__item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--metal);
}

/* 平板 */
@media (min-width: 640px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .network-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* 桌面 */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: end;
  }
  .page-about .about-split {
    grid-template-columns: minmax(0, 2fr) minmax(0, 8fr);
    column-gap: clamp(26px, 4vw, 64px);
  }
  .page-about .side-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }
  .page-about .about-service__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }
  .page-about .network-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
  }
}

@media (min-width: 880px) {
  .page-about .timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    border-top: 1px solid var(--about-line-strong);
  }
  .page-about .phase {
    border-top: 0;
    border-left: 1px solid var(--line);
    padding: 22px 20px 26px;
  }
  .page-about .phase:first-child {
    border-left: 0;
    padding-left: 0;
  }
  .page-about .phase::before {
    content: "";
    position: absolute;
    top: -4px;
    left: 20px;
    width: 7px;
    height: 7px;
    background: var(--orange);
  }
  .page-about .phase:first-child::before {
    left: 0;
  }
  .page-about .method-item {
    grid-template-columns: 72px minmax(0, 4fr) minmax(0, 6fr);
    align-items: start;
    column-gap: 22px;
    row-gap: 0;
    padding: 22px 0;
  }
  .page-about .method-item__num {
    padding-top: 5px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .team-card:nth-child(3n + 2) {
    transform: translateY(16px);
  }
}

/* 悬停展开阶段说明（仅在支持 hover 的宽屏生效，内容在窄屏默认可读） */
@media (hover: hover) and (min-width: 880px) {
  .page-about .phase__extra {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, opacity 0.3s ease, margin 0.3s ease;
    margin-top: 0;
  }
  .page-about .phase:hover .phase__extra,
  .page-about .phase:focus .phase__extra,
  .page-about .phase:focus-within .phase__extra {
    max-height: 160px;
    opacity: 1;
    margin-top: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .filter-btn,
  .page-about .phase__extra,
  .page-about .about-toc__inner a {
    transition: none;
  }
  .page-about .team-card:nth-child(3n + 2) {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>