.page-about {
  --pa-band: linear-gradient(
    180deg,
    var(--cyan) 0%,
    var(--mint) 26%,
    var(--violet) 50%,
    var(--magenta) 72%,
    var(--amber) 88%,
    var(--flame) 100%
  );
}

/* ---------- 首屏声明 ---------- */

.page-about .about-intro {
  padding: 36px 0 72px;
}

.page-about .about-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 16px;
  letter-spacing: 0.24em;
  color: var(--amber);
}

.page-about .about-title {
  margin: 18px 0 0;
  font-family: var(--font-brand);
  font-weight: 900;
  font-size: clamp(28px, 5vw, 54px);
  line-height: 1.16;
  letter-spacing: 0.03em;
  color: var(--paper);
  max-width: 18em;
  text-shadow: 0 0 34px rgba(0, 229, 255, 0.16);
}

.page-about .about-lede {
  margin: 26px 0 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(237, 241, 255, 0.8);
}

.page-about .about-anchors {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 48px;
  margin: 44px 0 0;
  padding: 26px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-scale);
}

.page-about .about-anchor {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-anchor-num {
  font-size: 30px;
  line-height: 36px;
  color: var(--paper);
}

.page-about .about-anchor:nth-child(1) .about-anchor-num { color: var(--cyan); }
.page-about .about-anchor:nth-child(2) .about-anchor-num { color: var(--mint); }
.page-about .about-anchor:nth-child(3) .about-anchor-num { color: var(--violet); }

.page-about .about-anchor-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 主体两栏 ---------- */

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding-bottom: 72px;
  align-items: start;
}

.page-about .about-rail {
  position: relative;
}

.page-about .about-rail-list {
  display: flex;
  gap: 22px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail-list::-webkit-scrollbar { display: none; }

.page-about .about-rail-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
  color: var(--muted);
  text-decoration: none;
  transition: color 180ms var(--ease-out);
}

.page-about .about-rail-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex: none;
  background: var(--line-scale);
}

.page-about .about-rail-item:nth-child(1) .about-rail-dot { background: var(--cyan); }
.page-about .about-rail-item:nth-child(2) .about-rail-dot { background: var(--mint); }
.page-about .about-rail-item:nth-child(3) .about-rail-dot { background: var(--violet); }
.page-about .about-rail-item:nth-child(4) .about-rail-dot { background: var(--magenta); }
.page-about .about-rail-item:nth-child(5) .about-rail-dot { background: var(--amber); }
.page-about .about-rail-item:nth-child(6) .about-rail-dot { background: var(--flame); }

.page-about .about-rail-num {
  font-size: 11px;
  line-height: 1;
  color: rgba(152, 163, 214, 0.7);
}

.page-about .about-rail-name {
  font-size: 13px;
  line-height: 1.4;
  white-space: nowrap;
}

.page-about .about-rail-link:hover { color: var(--paper); }
.page-about .about-rail-link:hover .about-rail-dot { box-shadow: 0 0 10px currentColor; }
.page-about .about-rail-link:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 4px;
}

/* ---------- 章节总则 ---------- */

.page-about .about-flow {
  position: relative;
  display: grid;
  gap: 76px;
  min-width: 0;
}

.page-about .about-sec {
  min-width: 0;
}

.page-about .about-sec--team { --sec: var(--cyan); }
.page-about .about-sec--history { --sec: var(--mint); }
.page-about .about-sec--process { --sec: var(--violet); }
.page-about .about-sec--partners { --sec: var(--magenta); }
.page-about .about-sec--scale { --sec: var(--amber); }
.page-about .about-sec--office { --sec: var(--flame); }

.page-about .about-sec-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 22px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-scale);
}

.page-about .about-sec-num {
  font-size: 13px;
  line-height: 1.4;
  color: var(--sec);
}

.page-about .about-sec-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(21px, 3vw, 32px);
  line-height: 1.42;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-about .about-p {
  margin: 0 0 18px;
  max-width: 36em;
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(237, 241, 255, 0.78);
}

.page-about .about-p:last-child { margin-bottom: 0; }

/* ---------- 01 团队构成 ---------- */

.page-about .about-team-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  align-items: start;
}

.page-about .about-team-fig {
  margin: 0;
}

.page-about .about-team-fig .figure-img {
  border: 1px solid var(--line-scale);
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team-card {
  position: relative;
  padding: 18px 20px 20px;
  background: var(--glass);
  border: 1px solid var(--line-scale);
  border-top: 1px solid var(--card-accent, var(--line-scale));
}

.page-about .about-team-card--ops { --card-accent: var(--cyan); }
.page-about .about-team-card--check { --card-accent: var(--mint); }
.page-about .about-team-card--design { --card-accent: var(--violet); }
.page-about .about-team-card--service { --card-accent: var(--magenta); }

.page-about .about-team-count {
  display: block;
  font-size: 27px;
  line-height: 1.2;
  color: var(--card-accent, var(--paper));
}

.page-about .about-team-name {
  display: block;
  margin-top: 2px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
}

.page-about .about-team-card p {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(237, 241, 255, 0.66);
}

/* ---------- 02 运营历程 ---------- */

.page-about .about-history-fig {
  margin: 0 0 34px;
}

.page-about .about-history-fig .figure-img {
  border: 1px solid var(--line-scale);
}

.page-about .about-timeline {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-milestone {
  position: relative;
  padding: 22px 0 22px 34px;
  border-top: 1px solid var(--line-scale);
}

.page-about .about-milestone:last-child {
  border-bottom: 1px solid var(--line-scale);
}

.page-about .about-mile-mark {
  position: absolute;
  left: 0;
  top: 30px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--sec);
  box-shadow: 0 0 12px var(--sec);
}

.page-about .about-mile-tag {
  display: inline-block;
  font-size: 11px;
  line-height: 1;
  letter-spacing: 0.2em;
  color: var(--sec);
}

.page-about .about-mile-title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.55;
  color: var(--paper);
}

.page-about .about-milestone p {
  margin: 0;
  max-width: 34em;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(237, 241, 255, 0.7);
}

/* ---------- 03 资料校订流程 ---------- */

.page-about .about-process-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  align-items: start;
  margin-top: 30px;
}

.page-about .about-steps {
  display: grid;
  gap: 10px;
}

.page-about .about-step {
  background: var(--glass);
  border: 1px solid var(--line-scale);
  border-left: 2px solid var(--sec);
}

.page-about .about-step > summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-step > summary::-webkit-details-marker { display: none; }

.page-about .about-step > summary::after {
  content: "＋";
  margin-left: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
}

.page-about .about-step[open] > summary::after {
  content: "－";
  color: var(--sec);
}

.page-about .about-step-num {
  font-size: 13px;
  line-height: 1;
  color: var(--sec);
}

.page-about .about-step-name {
  font-size: 15.5px;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-step-day {
  margin-left: auto;
  font-size: 11px;
  line-height: 1;
  color: var(--muted);
}

.page-about .about-step > p {
  margin: 0;
  padding: 0 18px 16px;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(237, 241, 255, 0.7);
}

.page-about .about-process-fig {
  margin: 0;
}

.page-about .about-process-fig .figure-img {
  border: 1px solid var(--line-scale);
}

/* ---------- 04 合作生态 ---------- */

.page-about .about-partner-points {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-scale);
}

.page-about .about-partner-points li {
  padding: 20px 0;
  border-bottom: 1px solid var(--line-scale);
}

.page-about .about-point-key {
  display: block;
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0.16em;
  color: var(--sec);
}

.page-about .about-partner-points p {
  margin: 10px 0 0;
  max-width: 34em;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(237, 241, 255, 0.72);
}

/* ---------- 05 服务规模 ---------- */

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 30px 0 0;
  background: var(--line-scale);
  border: 1px solid var(--line-scale);
}

.page-about .about-stat {
  padding: 22px 18px;
  background: var(--ink-abyss);
}

.page-about .about-stat-num {
  display: block;
  font-size: 26px;
  line-height: 1.2;
  color: var(--paper);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-specs {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-scale);
}

.page-about .about-specs li {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 6px 18px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-scale);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-specs b {
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--paper);
}

/* ---------- 06 办公信息 ---------- */

.page-about .about-office {
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--amber);
}

.page-about .about-office-row {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-scale);
}

.page-about .about-office-key {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-office-val {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--paper);
  word-break: break-word;
}

.page-about .about-office-val--mono {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0;
}

.page-about .about-office-row--icp {
  border-bottom-color: rgba(255, 194, 75, 0.35);
}

/* ---------- 收尾动作 ---------- */

.page-about .about-next {
  margin-top: 8px;
  padding: 46px 0 76px;
  border-top: 1px solid var(--line-scale);
  background: radial-gradient(120% 150% at 82% 0%, rgba(0, 229, 255, 0.08), transparent 62%);
}

.page-about .about-next-inner {
  display: grid;
  gap: 22px;
}

.page-about .about-next-text {
  margin: 0;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--paper);
}

.page-about .about-next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 平板 ---------- */

@media (min-width: 700px) {
  .page-about .about-team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-partner-points li {
    display: grid;
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 6px 24px;
    align-items: start;
  }

  .page-about .about-partner-points p { margin-top: 4px; }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-stat { padding: 26px 20px; }
  .page-about .about-stat-num { font-size: 30px; }

  .page-about .about-next-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
  }
}

/* ---------- 桌面 ---------- */

@media (min-width: 960px) {
  .page-about .about-intro {
    padding: 48px 0 92px;
  }

  .page-about .about-body {
    grid-template-columns: 142px minmax(0, 1fr);
    gap: 0 52px;
    padding-bottom: 104px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 116px;
    align-self: start;
    padding-top: 4px;
  }

  .page-about .about-rail-list {
    flex-direction: column;
    gap: 2px;
    padding: 0;
    overflow: visible;
  }

  .page-about .about-rail-link {
    padding: 8px 0;
  }

  .page-about .about-flow {
    padding-left: 32px;
    gap: 96px;
  }

  .page-about .about-flow::before {
    content: "";
    position: absolute;
    left: 0;
    top: 6px;
    bottom: 6px;
    width: 1px;
    background: var(--pa-band);
    opacity: 0.5;
  }

  .page-about .about-team-layout {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .about-process-layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 44px;
  }

  .page-about .about-office-row {
    grid-template-columns: 120px minmax(0, 1fr);
  }
}

@media (min-width: 1180px) {
  .page-about .about-title {
    max-width: 16em;
  }

  .page-about .about-lede {
    font-size: 17px;
  }
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail-link,
  .page-about .about-rail-dot {
    transition: none;
  }

  .page-about .about-mile-mark {
    box-shadow: none;
  }
}
<<<END>>>