.page-about {
  --about-rail: 232px;
  --about-gutter: 1rem;
  background: var(--hu-night);
  color: var(--hu-ice);
  font-family: var(--hu-sans);
  font-size: var(--hu-fs-16);
  line-height: 1.75;
  overflow-x: clip;
}

.page-about .about-shell {
  width: 100%;
  max-width: var(--hu-measure);
  margin-inline: auto;
  padding-inline: var(--about-gutter);
}

@media (min-width: 700px) {
  .page-about {
    --about-gutter: 2rem;
  }
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: 0.75rem 2.75rem;
  overflow: hidden;
  background:
    radial-gradient(110% 85% at 90% 0%, rgba(38, 242, 208, 0.16), transparent 60%),
    radial-gradient(120% 100% at 0% 20%, rgba(11, 44, 71, 0.95), transparent 70%),
    var(--hu-night);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(120deg, rgba(7, 31, 51, 0.92), rgba(38, 242, 208, 0.12) 54%, rgba(4, 16, 27, 0) 80%);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 0 94%);
}

.page-about .about-hero > .about-shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 1.25rem;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 1.75rem;
}

.page-about .about-hero h1 {
  font-family: var(--hu-serif);
  font-size: clamp(2rem, 6.6vw, 3.4rem);
  font-weight: 700;
  line-height: 1.16;
  margin: 0.5rem 0 1rem;
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 36em;
  color: var(--hu-fog);
  font-size: var(--hu-fs-16);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 1.5rem 0 1.75rem;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem 0.75rem;
}

.page-about .about-fact {
  border-left: 3px solid var(--hu-cyan);
  padding: 0.3rem 0 0.3rem 0.7rem;
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--hu-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--hu-fs-24);
  line-height: 1.1;
  color: var(--hu-cyan);
}

.page-about .about-fact__label {
  display: block;
  margin-top: 0.15rem;
  font-size: var(--hu-fs-12);
  letter-spacing: 0.04em;
  color: var(--hu-fog);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.page-about .about-hero__media {
  margin: 0;
  border: 2px solid var(--hu-line);
  box-shadow: var(--hu-shadow-hard-lg);
  background: var(--hu-panel);
}

.page-about .about-hero__media img,
.page-about .about-multidevice img,
.page-about .about-team__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media-frame__caption {
  padding: 0.6rem 0.8rem;
  font-size: var(--hu-fs-12);
  line-height: 1.6;
  color: var(--hu-fog);
  border-top: 1px solid var(--hu-line);
  background: rgba(4, 16, 27, 0.6);
}

/* ---------- 双栏主体 ---------- */
.page-about .about-body {
  padding-block: 2.5rem 3rem;
  display: grid;
  gap: 2rem;
}

.page-about .about-rail__title {
  margin: 0 0 0.75rem;
  padding-bottom: 0.5rem;
  font-family: var(--hu-mono);
  font-size: var(--hu-fs-12);
  letter-spacing: 0.2em;
  color: var(--hu-mist);
  border-bottom: 1px solid var(--hu-line);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0.25rem;
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__list a {
  display: block;
  padding: 0.35rem 0.7rem;
  white-space: nowrap;
  font-size: var(--hu-fs-14);
  color: var(--hu-fog);
  text-decoration: none;
  border-left: 2px solid var(--hu-line);
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--hu-ice);
  border-left-color: var(--hu-cyan);
  background: rgba(38, 242, 208, 0.08);
}

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 3rem;
    align-items: start;
    padding-block: 3.5rem 4rem;
  }

  .page-about .about-rail {
    position: sticky;
    top: 1.5rem;
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
  }

  .page-about .about-rail__list li + li {
    margin-top: 0.2rem;
  }

  .page-about .about-rail__list a {
    white-space: normal;
    padding: 0.45rem 0 0.45rem 0.75rem;
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  border-top: 1px solid var(--hu-line);
  padding-block: 1.75rem 2.25rem;
  scroll-margin-top: 5rem;
}

.page-about .about-main > .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-section h2 {
  font-family: var(--hu-serif);
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  line-height: 1.28;
  font-weight: 700;
  margin: 0.35rem 0 1rem;
  text-wrap: balance;
}

.page-about .about-section__lede {
  margin: 0 0 0.5rem;
  max-width: 40em;
  color: var(--hu-fog);
}

.page-about .about-section--tint {
  padding-inline: 1rem;
  border-top-color: rgba(30, 74, 100, 0.45);
  background: linear-gradient(180deg, rgba(11, 44, 71, 0.62), rgba(4, 16, 27, 0) 76%);
}

.page-about .about-cols {
  display: grid;
  gap: 1rem;
}

.page-about .about-cols p {
  margin: 0;
  color: var(--hu-fog);
}

.page-about .about-cols p:first-child {
  color: var(--hu-ice);
}

.page-about .about-points {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-about .about-points li {
  border-left: 2px solid var(--hu-line);
  padding-left: 0.85rem;
}

.page-about .about-points strong {
  display: block;
  font-size: var(--hu-fs-16);
  color: var(--hu-ice);
}

.page-about .about-points span {
  display: block;
  margin-top: 0.15rem;
  font-size: var(--hu-fs-14);
  color: var(--hu-fog);
}

@media (min-width: 760px) {
  .page-about .about-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2rem;
  }

  .page-about .about-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }
}

/* ---------- 服务原则 ---------- */
.page-about .about-principles {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .principle {
  background: var(--hu-panel);
  border: 2px solid var(--hu-line);
  box-shadow: var(--hu-shadow-hard);
  padding: 1.1rem 1rem 1.25rem;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.page-about .principle:hover,
.page-about .principle:focus-within {
  transform: translateY(-4px);
  border-color: var(--hu-cyan);
}

.page-about .principle__num {
  display: block;
  font-family: var(--hu-mono);
  font-size: var(--hu-fs-12);
  letter-spacing: 0.18em;
  color: var(--hu-mist);
}

.page-about .principle h3 {
  font-family: var(--hu-serif);
  font-size: var(--hu-fs-20);
  margin: 0.4rem 0 0.5rem;
}

.page-about .principle p {
  margin: 0;
  font-size: var(--hu-fs-14);
  color: var(--hu-fog);
}

@media (min-width: 780px) {
  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.1rem;
  }
}

.page-about .about-multidevice {
  margin: 1.75rem 0 0;
  border: 2px solid var(--hu-line);
  background: var(--hu-panel);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0 0 0.9rem;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(230px, 80%);
  gap: 1rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline > * {
  scroll-snap-align: start;
}

.page-about .milestone {
  background: linear-gradient(180deg, rgba(38, 242, 208, 0.08), rgba(11, 44, 71, 0.92) 46%);
  border: 2px solid var(--hu-line);
  border-top: 3px solid var(--hu-cyan);
  padding: 1rem 0.95rem 1.1rem;
  outline-offset: 3px;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .milestone:hover,
.page-about .milestone:focus-visible {
  border-color: var(--hu-cyan);
  box-shadow: var(--hu-shadow-hard);
}

.page-about .milestone__year {
  display: block;
  font-family: var(--hu-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--hu-fs-32);
  line-height: 1;
  color: var(--hu-cyan);
}

.page-about .milestone h3 {
  font-size: var(--hu-fs-16);
  margin: 0.6rem 0 0.4rem;
}

.page-about .milestone p {
  margin: 0;
  font-size: var(--hu-fs-14);
  color: var(--hu-fog);
}

.page-about .milestone .milestone__detail {
  margin-top: 0.6rem;
  padding-top: 0.6rem;
  border-top: 1px dashed var(--hu-line);
  font-size: var(--hu-fs-12);
  color: var(--hu-mist);
}

@media (hover: hover) and (pointer: fine) {
  .page-about .milestone__detail {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
    transition: max-height 0.35s ease, opacity 0.3s ease, margin-top 0.3s ease, padding-top 0.3s ease;
  }

  .page-about .milestone:hover .milestone__detail,
  .page-about .milestone:focus-visible .milestone__detail,
  .page-about .milestone:focus-within .milestone__detail {
    max-height: 10rem;
    opacity: 1;
    margin-top: 0.6rem;
    padding-top: 0.6rem;
    border-top-color: var(--hu-line);
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 1.5rem;
  margin-top: 1.25rem;
}

.page-about .about-team__copy p {
  margin: 0 0 1rem;
  color: var(--hu-fog);
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .about-team__list li {
  background: rgba(4, 16, 27, 0.5);
  border-left: 3px solid var(--hu-mist);
  padding: 0.6rem 0.85rem;
}

.page-about .about-team__list strong {
  display: block;
  font-family: var(--hu-serif);
  font-size: var(--hu-fs-16);
  color: var(--hu-ice);
}

.page-about .about-team__list span {
  display: block;
  margin-top: 0.15rem;
  font-size: var(--hu-fs-14);
  color: var(--hu-fog);
}

.page-about .about-team__media {
  margin: 0;
  border: 2px solid var(--hu-line);
  box-shadow: var(--hu-shadow-hard);
  background: var(--hu-panel);
  align-self: start;
}

@media (min-width: 880px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 2rem;
    align-items: start;
  }
}

/* ---------- 合作生态 ---------- */
.page-about .about-section p {
  max-width: 42em;
}

.page-about .about-stats {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hu-line);
  border: 1px solid var(--hu-line);
}

.page-about .about-stats__item {
  background: var(--hu-night);
  padding: 1rem 0.85rem 1.1rem;
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--hu-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--hu-fs-32);
  line-height: 1;
  color: var(--hu-cyan);
}

.page-about .about-stats__label {
  display: block;
  margin-top: 0.4rem;
  font-size: var(--hu-fs-12);
  line-height: 1.55;
  color: var(--hu-fog);
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 问答 ---------- */
.page-about .about-faq {
  margin-top: 1.25rem;
  display: grid;
  gap: 0.6rem;
}

.page-about .faq-item {
  background: var(--hu-deep);
  border: 1px solid var(--hu-line);
  border-left: 3px solid var(--hu-line);
  padding: 0.15rem 0.9rem;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .faq-item:hover,
.page-about .faq-item[open] {
  border-left-color: var(--hu-cyan);
  background: var(--hu-panel);
}

.page-about .faq-item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0;
  font-size: var(--hu-fs-16);
  font-weight: 600;
  color: var(--hu-ice);
}

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

.page-about .faq-item summary::after {
  content: "+";
  flex: none;
  font-family: var(--hu-mono);
  font-size: var(--hu-fs-20);
  line-height: 1;
  color: var(--hu-cyan);
}

.page-about .faq-item[open] summary::after {
  content: "−";
}

.page-about .faq-item p {
  margin: 0 0 0.9rem;
  padding-right: 0.5rem;
  font-size: var(--hu-fs-14);
  color: var(--hu-fog);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: 2.25rem;
  padding: 1.5rem 1.1rem 1.6rem;
  border: 2px solid var(--hu-line);
  box-shadow: var(--hu-shadow-hard);
  background:
    linear-gradient(140deg, rgba(38, 242, 208, 0.14), rgba(11, 44, 71, 0.92) 58%),
    var(--hu-deep);
}

.page-about .about-cta h2 {
  font-family: var(--hu-serif);
  font-size: clamp(1.4rem, 3.6vw, 2rem);
  line-height: 1.3;
  margin: 0 0 0.6rem;
}

.page-about .about-cta p {
  margin: 0;
  max-width: 40em;
  color: var(--hu-fog);
  font-size: var(--hu-fs-14);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.15rem;
}

@media (min-width: 760px) {
  .page-about .about-cta {
    padding: 2rem 1.75rem 2.1rem;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .principle,
  .page-about .milestone,
  .page-about .faq-item,
  .page-about .about-rail__list a,
  .page-about .milestone__detail {
    transition-duration: 0.001ms;
  }

  .page-about .principle:hover,
  .page-about .principle:focus-within {
    transform: none;
  }
}
<<<PAGE_CSS_DONE>>>