.page-about {
  --about-hair: rgba(201, 210, 220, .22);
  --about-hair-light: rgba(11, 27, 51, .12);
  --about-hero-radius: clamp(20px, 4vw, 40px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  background:
    radial-gradient(120% 88% at 88% -12%, rgba(34, 211, 238, .18), transparent 62%),
    radial-gradient(90% 70% at 6% 110%, rgba(255, 107, 44, .14), transparent 60%),
    var(--ink);
  color: var(--paper);
  padding: calc(var(--header-h) + clamp(2rem, 7vw, 4.75rem)) 0 0;
  overflow: hidden;
}

.page-about .about-hero-inner {
  max-width: 1080px;
}

.page-about .about-crumb,
.page-about .about-crumb a {
  color: rgba(247, 245, 241, .6);
  text-decoration: none;
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--echo);
}

.page-about .about-title {
  color: var(--paper);
  margin: .6rem 0 1.1rem;
  max-width: 16ch;
}

.page-about .about-hero-lead {
  margin: 0;
  max-width: 36rem;
  font-size: var(--fs-18);
  line-height: var(--lh-body);
  color: rgba(247, 245, 241, .82);
}

.page-about .hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem 2.25rem;
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  padding: 1.15rem 0 0;
  list-style: none;
  border-top: 1px solid var(--about-hair);
  font-size: var(--fs-14);
  letter-spacing: .02em;
  color: rgba(247, 245, 241, .7);
}

.page-about .hero-meta-num {
  font-family: var(--font-mono);
  font-size: var(--fs-18);
  color: var(--sand);
  margin-right: .4rem;
}

.page-about .hero-figure {
  margin: clamp(2rem, 6vw, 3.5rem) auto 0;
  padding: 0 var(--gutter);
  max-width: 1440px;
}

.page-about .hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--about-hero-radius) var(--about-hero-radius) 0 0;
}

/* ---------- 通用小标题组 ---------- */
.page-about .about-head {
  max-width: 46rem;
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-head h2 {
  margin: .55rem 0 .85rem;
}

.page-about .about-head .about-lead {
  margin: 0;
}

.page-about .about-lead {
  font-size: var(--fs-18);
  line-height: var(--lh-body);
  color: var(--slate);
}

.page-about .about-head--on-dark .about-lead--on-dark,
.page-about .about-lead--on-dark {
  color: rgba(247, 245, 241, .8);
}

/* ---------- 品牌主张 ---------- */
.page-about .about-promise {
  background: var(--paper);
  color: var(--carbon);
}

.page-about .promise-grid {
  display: grid;
  gap: clamp(1.5rem, 3.5vw, 2.5rem);
}

.page-about .promise-item {
  border-top: 3px solid var(--echo);
  padding-top: 1.15rem;
}

.page-about .promise-item:nth-child(2) {
  border-top-color: var(--cyan);
}

.page-about .promise-item:nth-child(3) {
  border-top-color: var(--tide);
}

.page-about .promise-num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: var(--track-label);
  color: var(--slate);
  margin-bottom: .5rem;
}

.page-about .promise-title {
  margin: 0 0 .55rem;
  font-size: var(--fs-28);
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--carbon);
}

.page-about .promise-text {
  margin: 0;
  font-size: var(--fs-18);
  line-height: var(--lh-body);
  color: var(--slate);
}

/* ---------- 团队矩阵 ---------- */
.page-about .about-teams {
  background: var(--paper-dim);
  color: var(--carbon);
}

.page-about .team-grid {
  display: grid;
  gap: clamp(1rem, 2.2vw, 1.5rem);
}

.page-about .team-block {
  position: relative;
  overflow: hidden;
  padding: clamp(1.35rem, 3vw, 2.1rem);
  border-radius: var(--radius-l);
  background: var(--ink-2);
  color: var(--paper);
  border: 1px solid rgba(201, 210, 220, .12);
}

.page-about .team-block::after {
  content: "";
  position: absolute;
  right: -18%;
  bottom: -46%;
  width: 62%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: var(--team-color, var(--cyan));
  opacity: .16;
  pointer-events: none;
}

.page-about .team-block--cyan { --team-color: var(--cyan); }
.page-about .team-block--echo { --team-color: var(--echo); }
.page-about .team-block--sand { --team-color: var(--sand); }
.page-about .team-block--tide { --team-color: var(--tide); }

.page-about .team-code {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: var(--track-label);
  color: var(--team-color, var(--cyan));
  margin-bottom: .85rem;
}

.page-about .team-name {
  margin: 0 0 .6rem;
  font-size: var(--fs-28);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .team-desc {
  position: relative;
  z-index: 1;
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: var(--lh-body);
  color: rgba(247, 245, 241, .82);
}

.page-about .team-scope {
  position: relative;
  z-index: 1;
  margin: 0;
  padding-top: .8rem;
  border-top: 1px solid var(--about-hair);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .08em;
  color: rgba(247, 245, 241, .6);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  background:
    radial-gradient(80% 60% at 10% 0%, rgba(34, 211, 238, .12), transparent 64%),
    var(--ink-2);
  color: var(--paper);
}

.page-about .timeline-layout {
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
}

.page-about .timeline-title {
  margin: .55rem 0 clamp(1.75rem, 4vw, 2.5rem);
  color: var(--paper);
  max-width: 22ch;
}

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 1.9rem;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: .55rem;
  bottom: .55rem;
  width: 1px;
  background: linear-gradient(180deg, rgba(34, 211, 238, .7), rgba(34, 211, 238, .06));
}

.page-about .tl-item {
  position: relative;
  padding-bottom: clamp(1.25rem, 3vw, 1.9rem);
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -1.9rem;
  top: .5rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-2);
  border: 2px solid var(--cyan);
  box-sizing: border-box;
}

.page-about .tl-node summary {
  list-style: none;
  cursor: pointer;
  display: block;
}

.page-about .tl-node summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .25rem 1rem;
  padding: .1rem 0;
}

.page-about .tl-summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
  border-radius: var(--radius-s);
}

.page-about .tl-node[open] .tl-summary {
  margin-bottom: .7rem;
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .tl-title {
  font-size: var(--fs-18);
  font-weight: 700;
  color: var(--paper);
}

.page-about .tl-node:not([open]) .tl-title {
  color: rgba(247, 245, 241, .68);
}

.page-about .tl-body {
  max-width: 40rem;
}

.page-about .tl-body p {
  margin: 0;
  font-size: 1rem;
  line-height: var(--lh-body);
  color: rgba(247, 245, 241, .8);
}

.page-about .timeline-note {
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  max-width: 38rem;
  padding-top: 1.15rem;
  border-top: 1px solid var(--about-hair);
  font-size: var(--fs-14);
  line-height: 1.9;
  color: rgba(247, 245, 241, .62);
}

.page-about .timeline-figure {
  margin: 0;
}

.page-about .timeline-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius-m);
  opacity: .92;
}

.page-about .figure-caption {
  margin-top: .75rem;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .06em;
  color: rgba(247, 245, 241, .55);
}

/* ---------- 服务半径 ---------- */
.page-about .about-radius {
  background: var(--paper);
  color: var(--carbon);
}

.page-about .radius-layout {
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
}

.page-about .radius-copy h2 {
  margin: .55rem 0 .85rem;
}

.page-about .radius-copy .about-lead {
  max-width: 38rem;
}

.page-about .radius-list {
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-hair-light);
}

.page-about .radius-item {
  display: grid;
  gap: .2rem .9rem;
  padding: .95rem 0;
  border-bottom: 1px solid var(--about-hair-light);
}

.page-about .radius-key {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: .1em;
  color: var(--echo);
}

.page-about .radius-val {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .radius-figure {
  margin: 0;
}

.page-about .radius-svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 520px;
  margin: 0 auto;
}

.page-about .radius-svg .arc {
  fill: none;
  stroke-width: 1.5;
}

.page-about .radius-svg .arc-1 { stroke: rgba(34, 211, 238, .28); }
.page-about .radius-svg .arc-2 { stroke: rgba(255, 107, 44, .42); }
.page-about .radius-svg .arc-3 { stroke: rgba(11, 27, 51, .55); }

.page-about .radius-svg .axis {
  stroke: rgba(11, 27, 51, .22);
  stroke-width: 1;
}

.page-about .radius-svg .dot {
  fill: var(--ink);
}

.page-about .radius-svg .dot-a { fill: var(--cyan); }
.page-about .radius-svg .dot-b,
.page-about .radius-svg .dot-c { fill: var(--echo); }
.page-about .radius-svg .dot-d,
.page-about .radius-svg .dot-e { fill: var(--tide); }
.page-about .radius-svg .dot-f { fill: var(--sand); }

/* ---------- 伙伴 ---------- */
.page-about .about-partners {
  background: var(--paper-dim);
  color: var(--carbon);
}

.page-about .partners-layout {
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
}

.page-about .partners-copy h2 {
  margin: .55rem 0 .85rem;
}

.page-about .partner-points {
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  padding: 0;
}

.page-about .partner-points li {
  position: relative;
  padding: .85rem 0 .85rem 1.6rem;
  border-bottom: 1px solid var(--about-hair-light);
  font-size: 1rem;
  line-height: var(--lh-body);
  color: var(--slate);
}

.page-about .partner-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.5rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 2px solid var(--tide);
  box-sizing: border-box;
}

.page-about .partners-figure {
  margin: 0;
}

.page-about .partners-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius-l);
}

/* ---------- 稳定交付 ---------- */
.page-about .about-stability {
  background:
    radial-gradient(90% 70% at 92% 0%, rgba(23, 166, 122, .35), transparent 60%),
    var(--deep-teal);
  color: var(--paper);
}

.page-about .about-stability .about-head h2 {
  color: var(--paper);
}

.page-about .stat-row {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
}

.page-about .stat {
  padding-top: 1.15rem;
  border-top: 2px solid rgba(247, 245, 241, .35);
}

.page-about .stat:nth-child(1) { border-top-color: var(--sand); }
.page-about .stat:nth-child(2) { border-top-color: var(--cyan); }
.page-about .stat:nth-child(3) { border-top-color: var(--paper); }

.page-about .stat-figure {
  margin: 0 0 .6rem;
  display: flex;
  align-items: baseline;
  gap: .4rem;
  flex-wrap: wrap;
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: var(--fs-44);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .stat-unit {
  font-size: var(--fs-14);
  letter-spacing: .06em;
  color: rgba(247, 245, 241, .72);
}

.page-about .stat-text {
  margin: 0;
  font-size: 1rem;
  line-height: var(--lh-body);
  color: rgba(247, 245, 241, .82);
}

/* ---------- 收尾 ---------- */
.page-about .about-closing {
  background: var(--paper);
  color: var(--carbon);
}

.page-about .about-closing-inner {
  max-width: 54rem;
}

.page-about .about-closing-title {
  margin: 0 0 .9rem;
  font-size: var(--fs-28);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--carbon);
}

.page-about .about-closing-text {
  margin: 0 0 clamp(1.5rem, 4vw, 2.25rem);
  font-size: var(--fs-18);
  line-height: var(--lh-body);
  color: var(--slate);
}

.page-about .closing-links {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .closing-links a {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .promise-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .stat-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .radius-item {
    grid-template-columns: 9rem minmax(0, 1fr);
    align-items: baseline;
  }
}

@media (min-width: 980px) {
  .page-about .team-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .team-block:nth-child(1) { grid-column: span 7; }
  .page-about .team-block:nth-child(2) { grid-column: span 5; }
  .page-about .team-block:nth-child(3) { grid-column: span 5; }
  .page-about .team-block:nth-child(4) { grid-column: span 7; }

  .page-about .timeline-layout {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-about .timeline-figure {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
  }

  .page-about .radius-layout {
    grid-template-columns: 7fr 5fr;
    align-items: center;
  }

  .page-about .partners-layout {
    grid-template-columns: 5fr 7fr;
    align-items: center;
  }

  .page-about .timeline {
    padding-left: 2.6rem;
  }

  .page-about .tl-item::before {
    left: -2.6rem;
    top: .6rem;
  }

  .page-about .tl-summary {
    flex-wrap: nowrap;
    gap: 1.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-block::after {
    opacity: .12;
  }
}
<<<END>>>