.page-about {
  --about-rail: 28px;
  --about-gap: clamp(40px, 6vw, 84px);
  position: relative;
  color: var(--silver);
  background-color: var(--bg-deep);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 72px) 0 clamp(36px, 5vw, 68px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -32% -16% 18% -16%;
  background:
    radial-gradient(46% 58% at 16% 36%, rgba(53, 230, 210, 0.15), transparent 68%),
    radial-gradient(44% 54% at 86% 6%, rgba(122, 92, 255, 0.24), transparent 70%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(30, 42, 68, 0.55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 42, 68, 0.55) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(74% 66% at 26% 34%, #000 6%, transparent 78%);
  mask-image: radial-gradient(74% 66% at 26% 34%, #000 6%, transparent 78%);
  opacity: 0.7;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: clamp(18px, 3vw, 34px);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-size: 0.75rem;
  letter-spacing: 0.24em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0 0 clamp(18px, 2.6vw, 28px);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-hero__title-main {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.4rem, 7vw, 4.6rem);
  letter-spacing: -0.02em;
  line-height: 1.06;
  color: var(--white);
  text-shadow: 0 0 18px rgba(53, 230, 210, 0.22);
}

.page-about .about-hero__title-sub {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.0625rem, 2.4vw, 1.6rem);
  letter-spacing: -0.01em;
  line-height: 1.4;
  color: var(--cyan);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 68ch;
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.85;
  letter-spacing: 0.01em;
  color: var(--silver);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(28px, 4vw, 52px) 0 0;
  padding: 1px;
  list-style: none;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(14px, 2vw, 22px) clamp(16px, 2vw, 24px);
  background: var(--bg-deep);
}

.page-about .about-stat__value {
  font-size: clamp(1.75rem, 4.4vw, 2.75rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .about-stat__unit {
  font-size: 0.5em;
  margin-left: 2px;
  color: var(--cyan-dim);
}

.page-about .about-stat__label {
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 星轨与章节 ---------- */

.page-about .about-flow {
  position: relative;
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-flow .container {
  position: relative;
}

.page-about .about-section {
  position: relative;
  padding-left: var(--about-rail);
  padding-bottom: var(--about-gap);
  scroll-margin-top: calc(var(--bar-h) + 60px);
}

.page-about .about-section:last-of-type {
  padding-bottom: clamp(32px, 4vw, 56px);
}

.page-about .about-section::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, rgba(53, 230, 210, 0.4), rgba(122, 92, 255, 0.3) 46%, rgba(30, 42, 68, 0.75));
}

.page-about .about-section:last-of-type::before {
  background: linear-gradient(180deg, rgba(122, 92, 255, 0.3), rgba(30, 42, 68, 0.5) 60%, transparent);
}

.page-about .about-section::after {
  content: "";
  position: absolute;
  left: 3px;
  top: 26px;
  width: 11px;
  height: 11px;
  background: var(--bg-deep);
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
  box-shadow: 0 0 12px rgba(53, 230, 210, 0.45);
  z-index: 2;
}

/* ---------- 面板 ---------- */

.page-about .about-panel {
  position: relative;
  padding: clamp(20px, 3.2vw, 40px);
  background: linear-gradient(166deg, var(--panel) 0%, var(--bg-mid) 58%, var(--bg-deep) 100%);
  border: 1px solid var(--line);
  box-shadow: 14px 14px 0 -1px rgba(10, 16, 32, 0.85), 14px 14px 0 0 rgba(30, 42, 68, 0.85);
}

.page-about .about-panel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 76px;
  background: linear-gradient(180deg, var(--cyan), rgba(53, 230, 210, 0));
}

.page-about .about-panel__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 16px;
  margin-bottom: clamp(18px, 2.4vw, 26px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-panel__num {
  flex: none;
  font-size: 0.8125rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-panel__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.1875rem, 2.6vw, 1.75rem);
  line-height: 1.38;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-panel__body > p {
  margin: 0 0 1.05em;
  max-width: 74ch;
  font-size: 1rem;
  line-height: 1.85;
  letter-spacing: 0.01em;
  color: var(--silver);
}

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

.page-about .about-panel__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-dim);
}

.page-about .about-panel__body a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .about-panel__tail {
  margin-top: clamp(20px, 2.6vw, 30px);
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 双栏 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 36px);
  align-items: start;
}

.page-about .about-split > div > p {
  margin: 0 0 1.05em;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--silver);
}

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

/* ---------- 图像 ---------- */

.page-about .about-figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background: linear-gradient(135deg, var(--panel), var(--bg-deep));
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--16x9 img { aspect-ratio: 16 / 9; }
.page-about .about-figure--3x2 img { aspect-ratio: 3 / 2; }
.page-about .about-figure--12x7 img { aspect-ratio: 12 / 7; }

.page-about .about-figure figcaption {
  padding: 12px 16px;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--mist);
  border-top: 1px solid var(--line);
  background: var(--bg-mid);
}

/* ---------- 团队条带 ---------- */

.page-about .about-teams {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-team {
  --band-w: 100%;
  border: 1px solid var(--line);
  background: var(--bg-mid);
  transition: border-color 180ms ease-out;
}

.page-about .about-team--content { --band-w: 47%; }
.page-about .about-team--tech { --band-w: 24%; }
.page-about .about-team--service { --band-w: 29%; }

.page-about .about-team:hover,
.page-about .about-team[open] {
  border-color: var(--cyan);
}

.page-about .about-team__summary {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  overflow: hidden;
}

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

.page-about .about-team__summary::marker {
  content: "";
}

.page-about .about-team__bar {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--band-w);
  background: linear-gradient(90deg, rgba(53, 230, 210, 0.18), rgba(53, 230, 210, 0.02));
  border-right: 2px solid var(--cyan);
  pointer-events: none;
  transition: background 180ms ease-out;
}

.page-about .about-team:hover .about-team__bar,
.page-about .about-team[open] .about-team__bar {
  background: linear-gradient(90deg, rgba(53, 230, 210, 0.28), rgba(53, 230, 210, 0.05));
}

.page-about .about-team__name {
  position: relative;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .about-team__count {
  position: relative;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-team__unit {
  margin-left: 2px;
  font-size: 0.75rem;
  color: var(--mist);
}

.page-about .about-team__detail {
  padding: 0 18px 16px;
  border-top: 1px solid var(--line);
}

.page-about .about-team__detail p {
  margin: 14px 0 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 流程 ---------- */

.page-about .about-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 1px;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-step {
  padding: clamp(16px, 2vw, 22px);
  background: var(--bg-deep);
  transition: background 180ms ease-out;
}

.page-about .about-step:hover {
  background: var(--panel);
}

.page-about .about-step__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-step__desc {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--silver);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  position: relative;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--nebula) 55%, rgba(30, 42, 68, 0.7));
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding-bottom: 16px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 1px solid var(--nebula);
  transition: border-color 180ms ease-out, box-shadow 180ms ease-out;
}

.page-about .about-timeline__item:hover::before {
  border-color: var(--cyan);
  box-shadow: 0 0 12px rgba(53, 230, 210, 0.65);
}

.page-about .about-timeline__ver {
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-timeline__note {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--silver);
}

/* ---------- 数据条 ---------- */

.page-about .about-facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 1px;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-fact {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: clamp(14px, 2vw, 20px) clamp(16px, 2vw, 22px);
  background: var(--bg-deep);
}

.page-about .about-fact__num {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
  letter-spacing: -0.01em;
}

.page-about .about-fact__unit {
  margin-left: 1px;
  font-size: 0.45em;
  color: var(--cyan);
}

.page-about .about-fact__label {
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 准则 ---------- */

.page-about .about-principles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  padding: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-principle {
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--bg-mid);
  transition: background 180ms ease-out;
}

.page-about .about-principle:hover {
  background: var(--panel);
}

.page-about .about-principle__num {
  display: block;
  margin-bottom: 12px;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-principle__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.0625rem;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-about .about-principle p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--silver);
}

/* ---------- 尾段行动 ---------- */

.page-about .about-cta {
  margin-left: var(--about-rail);
  margin-top: clamp(8px, 2vw, 18px);
  padding: clamp(20px, 3vw, 34px);
  border: 1px solid var(--line);
  background: linear-gradient(118deg, rgba(122, 92, 255, 0.16), rgba(53, 230, 210, 0.07) 58%, transparent);
}

.page-about .about-cta__text {
  margin: 0 0 18px;
  max-width: 60ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--silver);
}

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

/* ---------- 断点 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about {
    --about-rail: 46px;
  }

  .page-about .about-section::before {
    left: 18px;
  }

  .page-about .about-section::after {
    left: 13px;
  }

  .page-about .about-section:nth-child(odd) {
    margin-right: 7%;
  }

  .page-about .about-section:nth-child(even) {
    margin-left: 6%;
    margin-right: 2%;
  }

  .page-about .about-section:nth-child(even)::before,
  .page-about .about-section:nth-child(even)::after {
    left: 18px;
  }

  .page-about .about-section:nth-child(even)::after {
    left: 13px;
  }

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

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

@media (min-width: 1000px) {
  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team,
  .page-about .about-team__bar,
  .page-about .about-step,
  .page-about .about-principle,
  .page-about .about-timeline__item::before {
    transition: none;
  }
}
<<<END>>>