.page-about {
  background: var(--ink);
  color: var(--bone);
  padding-bottom: clamp(40px, 7vw, 88px);
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: clamp(18px, 3vw, 30px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--rock);
}
.page-about .breadcrumb-link {
  color: var(--bone-dim);
  text-decoration: none;
  transition: color .2s ease;
}
.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--lime);
}
.page-about .breadcrumb-sep {
  color: var(--line-strong);
}
.page-about .breadcrumb-current {
  color: var(--ice);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  margin-top: clamp(14px, 2.5vw, 24px);
  padding: clamp(30px, 6vw, 76px) 0 clamp(38px, 7vw, 92px);
  background:
    radial-gradient(120% 100% at 8% 0%, rgba(143, 216, 255, .14), transparent 58%),
    linear-gradient(158deg, var(--navy) 0%, var(--ink) 72%);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.page-about .about-hero-wedge {
  position: absolute;
  top: -30%;
  right: -18%;
  width: 62%;
  height: 160%;
  background: linear-gradient(140deg, rgba(182, 255, 59, .17), rgba(182, 255, 59, 0) 62%);
  clip-path: polygon(34% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}
.page-about .about-hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
}
.page-about .about-hero-title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(38px, 8vw, 88px);
  font-weight: 800;
  line-height: .96;
  letter-spacing: -.02em;
}
.page-about .about-hero-lede {
  margin: 20px 0 0;
  max-width: 36em;
  color: var(--bone-dim);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
}
.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}
.page-about .about-hero-panel {
  align-self: end;
  display: grid;
  gap: 2px;
  padding-left: 18px;
  border-left: 2px solid var(--lime);
}
.page-about .about-hero-stat {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--line-soft);
}
.page-about .about-hero-stat:last-child {
  border-bottom: 0;
}
.page-about .about-hero-stat strong {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--lime);
}
.page-about .about-hero-stat span {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--rock);
}

/* 索引 + 内容两栏 */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.5vw, 44px);
  padding-top: clamp(30px, 5vw, 64px);
}
.page-about .about-index {
  min-width: 0;
}
.page-about .about-index-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .about-index-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  white-space: nowrap;
  font-size: 13px;
  color: var(--bone-dim);
  text-decoration: none;
  border: 1px solid var(--line-soft);
  transition: color .2s ease, border-color .2s ease;
}
.page-about .about-index-link span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--rock);
}
.page-about .about-index-link:hover,
.page-about .about-index-link:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
}
.page-about .about-index-link:hover span,
.page-about .about-index-link:focus-visible span {
  color: var(--lime);
}
.page-about .about-flow {
  min-width: 0;
}

/* 章节通用 */
.page-about .about-sec {
  padding: clamp(26px, 4.5vw, 52px) 0;
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: 96px;
}
.page-about .about-flow > .about-sec:first-child {
  padding-top: 0;
  border-top: 0;
}
.page-about .about-sec-head {
  display: grid;
  gap: 6px;
  margin-bottom: clamp(16px, 2.6vw, 26px);
}
.page-about .about-sec-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--lime);
}
.page-about .about-sec-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.4vw, 38px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -.01em;
}
.page-about .about-sec-kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--rock);
}
.page-about .about-text {
  margin: 0 0 18px;
  max-width: 60ch;
  color: var(--bone-dim);
  font-size: clamp(14.5px, 1.5vw, 16.5px);
  line-height: 1.85;
}

/* 01 品牌起点 */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3.5vw, 36px);
}
.page-about .about-claims {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}
.page-about .about-claims li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--bone-dim);
}
.page-about .about-claims li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 9px;
  height: 2px;
  background: var(--lime);
}
.page-about .about-claims b {
  color: var(--bone);
}
.page-about .about-cut-figure {
  position: relative;
  margin: 0;
  clip-path: polygon(0 0, 100% 0, 100% 91%, 0 100%);
  background: var(--navy);
}
.page-about .about-cut-figure img {
  display: block;
  width: 100%;
  height: auto;
  filter: saturate(.9) contrast(1.06) brightness(.92);
}
.page-about .about-cut-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(143, 216, 255, .16) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(143, 216, 255, .16) 1px, transparent 1px);
  background-size: 44px 44px;
}
.page-about .about-figure-cap {
  margin: 12px 0 0;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--rock);
}

/* 02 发展历程 */
.page-about .about-track {
  display: flex;
  gap: 14px;
  margin: 0;
  padding: 8px 0 14px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
}
.page-about .about-track li {
  position: relative;
  flex: 0 0 min(80vw, 286px);
  scroll-snap-align: start;
  padding: 20px 16px 20px;
  background: linear-gradient(180deg, rgba(14, 26, 43, .92), rgba(7, 11, 20, .92));
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--moss);
}
.page-about .about-track li::before {
  content: "";
  position: absolute;
  top: -7px;
  left: 16px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--ice);
}
.page-about .about-track-stage {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--ice);
}
.page-about .about-track-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.3;
}
.page-about .about-track li p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--bone-dim);
}

/* 03 团队构成 */
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}
.page-about .about-team-card {
  padding: 14px 16px;
  background: rgba(14, 26, 43, .78);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--moss);
  transition: border-color .2s ease;
}
.page-about .about-team-card[open] {
  border-left-color: var(--lime);
}
.page-about .about-team-card summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  column-gap: 12px;
  row-gap: 2px;
  cursor: pointer;
  list-style: none;
}
.page-about .about-team-card summary::-webkit-details-marker {
  display: none;
}
.page-about .about-team-card summary::marker {
  content: "";
}
.page-about .about-team-num {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}
.page-about .about-team-name {
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: .02em;
}
.page-about .about-team-cue {
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--rock);
}
.page-about .about-team-card[open] .about-team-cue {
  color: var(--lime);
}
.page-about .about-team-card p {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--bone-dim);
}
.page-about .about-team-figure {
  margin: clamp(20px, 3.5vw, 34px) 0 0;
  border: 1px solid var(--line-soft);
}
.page-about .about-team-figure img {
  display: block;
  width: 100%;
  height: clamp(180px, 34vw, 380px);
  object-fit: cover;
  filter: saturate(.85) brightness(.9);
}

/* 04 服务覆盖 */
.page-about .about-legend {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-legend-item {
  padding: 16px;
  background: rgba(7, 11, 20, .6);
  border: 1px solid var(--line-soft);
  transition: border-color .2s ease;
}
.page-about .about-legend-item:hover,
.page-about .about-legend-item:focus-within {
  border-color: var(--ice);
}
.page-about .about-legend-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--rock);
}
.page-about .about-dot {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
}
.page-about .about-dot-lime {
  background: var(--lime);
  box-shadow: 0 0 0 3px rgba(182, 255, 59, .16);
}
.page-about .about-dot-ice {
  background: var(--ice);
  box-shadow: 0 0 0 3px rgba(143, 216, 255, .16);
}
.page-about .about-dot-moss {
  background: var(--moss);
  box-shadow: 0 0 0 3px rgba(92, 122, 90, .22);
}
.page-about .about-legend-val {
  display: block;
  margin: 10px 0 6px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--bone);
}
.page-about .about-legend-item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--bone-dim);
}
.page-about .about-band-figure {
  margin: clamp(20px, 3.5vw, 32px) 0 0;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.page-about .about-band-figure img {
  display: block;
  width: 100%;
  height: clamp(140px, 22vw, 260px);
  object-fit: cover;
  filter: saturate(.8) brightness(.86);
}

/* 05 合作生态 */
.page-about .about-partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}
.page-about .about-partner {
  padding: 18px 16px;
  background: linear-gradient(180deg, rgba(14, 26, 43, .7), rgba(7, 11, 20, .5));
  border: 1px solid var(--line-soft);
  border-bottom: 2px solid var(--clay);
}
.page-about .about-partner-tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 8px;
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--clay);
  border: 1px solid rgba(196, 106, 74, .45);
}
.page-about .about-partner h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.3;
}
.page-about .about-partner p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--bone-dim);
}
.page-about .about-inline-link {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--bone-dim);
}

/* 06 质量与流程 */
.page-about .about-checks {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
}
.page-about .about-checks li {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .about-checks li:first-child {
  border-top: 1px solid var(--line-soft);
}
.page-about .about-checks-key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--ice);
}
.page-about .about-checks li p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--bone-dim);
}
.page-about .about-cta {
  margin-top: clamp(26px, 4vw, 44px);
  padding: clamp(22px, 4vw, 38px);
  background:
    linear-gradient(140deg, rgba(182, 255, 59, .13), rgba(143, 216, 255, .07) 60%, transparent),
    var(--navy);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--lime);
}
.page-about .about-cta h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.6vw, 27px);
  font-weight: 800;
  line-height: 1.25;
}
.page-about .about-cta > p {
  margin: 0;
  max-width: 56ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--bone-dim);
}
.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}
.page-about .about-privacy-note {
  margin: 18px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--rock);
}

/* 断点：平板 */
@media (min-width: 720px) {
  .page-about .about-team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-team-card:nth-child(2) {
    margin-top: 24px;
  }
  .page-about .about-team-card:nth-child(3) {
    margin-top: 10px;
  }
  .page-about .about-team-card:nth-child(4) {
    margin-top: 32px;
  }
  .page-about .about-checks li {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }
  .page-about .about-legend {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: end;
  }
}

/* 断点：桌面，索引变固定侧栏 */
@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: clamp(30px, 4vw, 56px);
  }
  .page-about .about-index {
    position: sticky;
    top: 92px;
  }
  .page-about .about-index-list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .about-index-link {
    display: flex;
    padding: 7px 0 7px 14px;
    border: 0;
    border-left: 2px solid var(--line-soft);
    white-space: normal;
    line-height: 1.5;
  }
  .page-about .about-index-link:hover,
  .page-about .about-index-link:focus-visible {
    border-left-color: var(--lime);
  }
}
<<<END>>>