.page-about {
  --about-line-soft: rgba(42, 76, 107, 0.32);
  --about-cell: rgba(16, 38, 61, 0.72);
  background-color: var(--deep);
  background-image:
    linear-gradient(to right, var(--about-line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-line-soft) 1px, transparent 1px);
  background-size: 48px 48px;
  color: var(--paper);
  font-family: var(--font-body);
  padding-bottom: 0;
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.01em;
  margin: 0;
}

.page-about p {
  margin: 0;
}

.page-about a {
  color: inherit;
}

.page-about .about-crumbs {
  padding-top: 20px;
  padding-bottom: 4px;
}

.page-about .crumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .crumbs a {
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--signal-soft);
  border-bottom-color: var(--signal-soft);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: 28px 0 48px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-hero__lede h1 {
  font-size: clamp(32px, 7.2vw, 58px);
  line-height: 1.08;
  margin: 14px 0 18px;
  max-width: 20ch;
}

.page-about .about-hero__lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ice);
  max-width: 60ch;
}

.page-about .about-hero__sub {
  margin-top: 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 58ch;
}

.page-about .board {
  border: 2px solid var(--line);
  background: var(--stand);
  box-shadow: var(--shadow-hard);
  padding: 18px 16px 16px;
}

.page-about .board__title {
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .board__list {
  list-style: none;
  margin: 0;
  padding: 6px 0;
}

.page-about .board__list li + li {
  border-top: 1px solid rgba(42, 76, 107, 0.55);
}

.page-about .board__list a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 6px 12px 0;
  text-decoration: none;
  font-size: 15px;
  color: var(--ice);
  border-left: 2px solid transparent;
  padding-left: 10px;
  transition: border-color 160ms var(--ease), color 160ms var(--ease), background-color 160ms var(--ease);
}

.page-about .board__list a .mono {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .board__list a:hover,
.page-about .board__list a:focus-visible {
  border-left-color: var(--signal);
  background: rgba(255, 107, 31, 0.08);
  color: var(--paper);
}

.page-about .board__list a:hover .mono,
.page-about .board__list a:focus-visible .mono {
  color: var(--signal);
}

.page-about .board__foot {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
  margin-top: 6px;
}

.page-about .board__stat .mono {
  display: block;
  font-size: 20px;
  line-height: 1.1;
  color: var(--signal);
  font-variant-numeric: tabular-nums;
}

.page-about .board__stat em {
  display: block;
  font-style: normal;
  font-size: 11px;
  line-height: 1.4;
  color: var(--mist);
  margin-top: 4px;
}

/* ---------- 通用章节骨架 ---------- */

.page-about .about-sec {
  padding: 44px 0;
  border-top: 1px solid rgba(42, 76, 107, 0.45);
}

.page-about .about-sec__head {
  display: grid;
  gap: 10px;
  margin-bottom: 30px;
}

.page-about .about-sec__no {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--signal);
}

.page-about .about-sec__title {
  font-size: clamp(24px, 5vw, 34px);
  line-height: 1.2;
  max-width: 30ch;
}

.page-about .about-sec__lead {
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 56ch;
}

/* ---------- 时间轴 ---------- */

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 2px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 28px;
  width: 2px;
  background: var(--line);
}

.page-about .stage {
  position: relative;
  padding-left: 40px;
  padding-bottom: 30px;
}

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

.page-about .stage::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 20px;
  height: 20px;
  border: 2px solid var(--line);
  background: var(--deep);
  transition: border-color 160ms var(--ease), background-color 160ms var(--ease);
}

.page-about .stage--now::before {
  background: var(--signal);
  border-color: var(--signal);
  box-shadow: 0 0 0 5px rgba(255, 107, 31, 0.16);
}

.page-about .stage__index {
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
  margin-bottom: 6px;
}

.page-about .stage--now .stage__index {
  color: var(--signal-soft);
}

.page-about .stage__title {
  font-size: 20px;
  line-height: 1.35;
  margin-bottom: 8px;
  color: var(--paper);
}

.page-about .stage__text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ice);
  max-width: 62ch;
}

.page-about .stage__more {
  margin-top: 10px;
  border-left: 2px solid rgba(42, 76, 107, 0.7);
  padding-left: 12px;
}

.page-about .stage__more summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--signal-soft);
  transition: color 160ms var(--ease);
}

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

.page-about .stage__more summary::before {
  content: "+";
  display: inline-block;
  width: 14px;
  text-align: center;
  font-weight: 700;
  color: var(--signal);
}

.page-about .stage__more[open] summary::before {
  content: "\2212";
}

.page-about .stage__more[open] summary {
  color: var(--signal);
}

.page-about .stage__more summary:hover,
.page-about .stage__more summary:focus-visible {
  color: var(--paper);
}

.page-about .stage__more ul {
  margin: 4px 0 8px;
  padding-left: 16px;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.75;
}

.page-about .stage__more li + li {
  margin-top: 4px;
}

/* ---------- 团队 ---------- */

.page-about .team__banner {
  margin: 0 0 28px;
  border: 2px solid var(--line);
  background: var(--stand);
}

.page-about .team__banner-cap,
.page-about .flow__media-cap {
  display: block;
  padding: 10px 12px;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

.page-about .team-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

.page-about .team-card {
  border: 2px solid var(--line);
  background: var(--stand);
  padding: 18px 16px 20px;
  transition: border-color 160ms var(--ease), transform 160ms var(--ease), box-shadow 160ms var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  border-color: var(--signal);
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
}

.page-about .team-card__count {
  display: block;
  font-size: 34px;
  line-height: 1;
  color: var(--signal);
  font-variant-numeric: tabular-nums;
  margin-bottom: 8px;
}

.page-about .team-card__count span {
  font-size: 13px;
  color: var(--mist);
  margin-left: 4px;
}

.page-about .team-card__name {
  font-size: 18px;
  margin-bottom: 8px;
  color: var(--paper);
}

.page-about .team-card__desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 流程 ---------- */

.page-about .flow {
  display: grid;
  gap: 26px;
}

.page-about .flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: flow;
}

.page-about .flow-step {
  position: relative;
  padding: 0 0 22px 44px;
  counter-increment: flow;
}

.page-about .flow-step:last-child {
  padding-bottom: 0;
}

.page-about .flow-step::before {
  content: counter(flow, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--deep);
  background: var(--signal-soft);
  width: 30px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .flow-step__time {
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--pitch);
  margin-bottom: 6px;
}

.page-about .flow-step__title {
  font-size: 19px;
  margin-bottom: 6px;
  color: var(--paper);
}

.page-about .flow-step__text {
  font-size: 15px;
  line-height: 1.78;
  color: var(--ice);
  max-width: 58ch;
}

.page-about .flow__media {
  margin: 0;
  border: 2px solid var(--line);
  background: var(--stand);
  box-shadow: var(--shadow-hard);
}

/* ---------- 产能数字 ---------- */

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

.page-about .metric {
  background: var(--stand);
  padding: 16px 14px 18px;
  min-height: 108px;
}

.page-about .metric__num {
  display: block;
  font-size: clamp(26px, 6vw, 38px);
  line-height: 1.05;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.page-about .metric__unit {
  font-size: 0.42em;
  color: var(--signal);
  margin-left: 4px;
  letter-spacing: 0.02em;
}

.page-about .metric__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 运营信息 ---------- */

.page-about .company__list {
  margin: 0;
  border-top: 2px solid var(--line);
}

.page-about .company__row {
  display: grid;
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(42, 76, 107, 0.55);
}

.page-about .company__key {
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--signal-soft);
}

.page-about .company__val {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ice);
  max-width: 62ch;
}

/* ---------- 收尾 ---------- */

.page-about .outro {
  padding: 46px 0 60px;
  border-top: 1px solid rgba(42, 76, 107, 0.45);
}

.page-about .outro__grid {
  display: grid;
  gap: 26px;
}

.page-about .outro__media {
  margin: 0;
  border: 2px solid var(--line);
  max-width: 320px;
}

.page-about .outro__text h2 {
  font-size: clamp(22px, 4.6vw, 30px);
  line-height: 1.25;
  margin: 10px 0 12px;
}

.page-about .outro__text p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ice);
  max-width: 54ch;
}

.page-about .outro__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .outro__links .btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 36px 0 56px;
  }

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

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

  .page-about .company__row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }
}

@media (min-width: 960px) {
  .page-about {
    background-size: 64px 64px;
  }

  .page-about .about-crumbs {
    padding-top: 26px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .board {
    margin-top: 34px;
    padding: 22px 20px 18px;
  }

  .page-about .about-sec {
    padding: 64px 0;
  }

  .page-about .about-sec__head {
    grid-template-columns: 88px minmax(0, 1fr);
    column-gap: 20px;
    align-items: start;
    margin-bottom: 38px;
  }

  .page-about .about-sec__no {
    font-size: 22px;
    padding-top: 6px;
    border-top: 2px solid var(--signal);
    align-self: start;
  }

  .page-about .about-sec__title {
    grid-column: 2;
  }

  .page-about .about-sec__lead {
    grid-column: 2;
  }

  .page-about .timeline {
    margin-left: 108px;
    padding-left: 0;
  }

  .page-about .stage {
    padding-left: 52px;
    padding-bottom: 34px;
  }

  .page-about .stage::before {
    width: 24px;
    height: 24px;
    left: 0;
  }

  .page-about .timeline::before {
    left: 11px;
  }

  .page-about .stage__title {
    font-size: 22px;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    border: 2px solid var(--line);
    background: var(--line);
  }

  .page-about .team-card {
    border: 0;
    border-right: 1px solid var(--line);
  }

  .page-about .team-card:last-child {
    border-right: 0;
  }

  .page-about .flow {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .flow__media {
    margin-top: 8px;
  }

  .page-about .metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-left: 108px;
  }

  .page-about .company__list {
    margin-left: 108px;
  }

  .page-about .outro__grid {
    grid-template-columns: minmax(0, 0.6fr) minmax(0, 1fr);
    gap: 48px;
    align-items: center;
  }

  .page-about .outro__media {
    max-width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .board__list a,
  .page-about .stage::before {
    transition-duration: 1ms;
    transform: none;
  }

  .page-about .team-card:hover,
  .page-about .team-card:focus-within {
    transform: none;
  }
}
<<<END>>>