.page-about {
  --about-rail-w: 200px;
  --about-cut: 16px;
  --about-gap: clamp(24px, 4vw, 64px);
  --about-sticky: calc(var(--hh-header-h) + var(--hh-ticker-h) + 20px);
  display: block;
  position: relative;
  background: var(--hh-ink);
  color: var(--hh-white);
}

.page-about .about-shell {
  display: block;
  padding-top: clamp(20px, 3.4vw, 40px);
  padding-bottom: clamp(48px, 8vw, 104px);
}

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

/* ---------- 侧边索引轨道 ---------- */
.page-about .about-rail {
  display: none;
}

.page-about .about-rail .hh-rail__title {
  margin: 0 0 14px;
  padding-left: 16px;
  font-family: var(--hh-font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--hh-mist);
}

.page-about .about-rail .hh-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
}

.page-about .about-rail .hh-rail__item {
  margin: 0;
}

.page-about .about-rail .hh-rail__link {
  display: block;
  padding: 9px 12px 9px 16px;
  border-left: 2px solid transparent;
  color: var(--hh-mist);
  font-size: 14px;
  line-height: 1.45;
  text-decoration: none;
  transition: color 0.2s var(--hh-ease), border-color 0.2s var(--hh-ease), background-color 0.2s var(--hh-ease);
}

.page-about .about-rail .hh-rail__link:hover,
.page-about .about-rail .hh-rail__link:focus-visible {
  color: var(--hh-white);
  background: var(--hh-deep);
}

.page-about .about-rail .hh-rail__link:focus-visible {
  outline: 2px solid var(--hh-cyan);
  outline-offset: -2px;
}

.page-about .about-rail .hh-rail__link.is-active,
.page-about .about-rail .hh-rail__link[aria-current="true"] {
  color: var(--hh-cyan);
  border-left-color: var(--hh-cyan);
  background: var(--hh-deep);
}

.page-about .about-rail .hh-rail__meta {
  margin: 20px 0 0;
  padding-left: 16px;
  font-family: var(--hh-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--hh-mist);
}

@media (min-width: 1080px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: var(--about-sticky);
    padding-right: 18px;
    border-right: 1px solid var(--hh-line);
  }
}

/* ---------- 通用排版 ---------- */
.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--hh-font-display);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--hh-white);
}

.page-about h1 {
  margin: 10px 0 20px;
  font-size: clamp(34px, 6vw, 68px);
  line-height: 1.02;
}

.page-about h2 {
  margin: 8px 0 16px;
  font-size: clamp(26px, 3.9vw, 48px);
  line-height: 1.08;
  text-wrap: balance;
}

.page-about h3 {
  font-size: clamp(18px, 2vw, 23px);
  font-weight: 800;
  line-height: 1.25;
  margin: 0 0 10px;
}

.page-about .about-lead {
  margin: 0 0 clamp(20px, 2.6vw, 30px);
  max-width: 66ch;
  color: var(--hh-white);
  font-size: clamp(15px, 1.15vw, 18px);
  line-height: 1.75;
}

.page-about .about-prose {
  max-width: 68ch;
}

.page-about .about-prose p {
  margin: 0 0 1.1em;
  color: var(--hh-white);
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.78;
}

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

.page-about .about-cap {
  margin: 12px 0 0;
  color: var(--hh-mist);
  font-size: 13px;
  line-height: 1.68;
}

.page-about .about-block {
  scroll-margin-top: 132px;
}

.page-about .about-main > .about-block + .about-block {
  margin-top: clamp(52px, 7.5vw, 104px);
  padding-top: clamp(40px, 5.5vw, 76px);
  border-top: 1px solid var(--hh-line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-bottom: clamp(32px, 4.4vw, 56px);
}

.page-about .about-hero h1 {
  max-width: 22ch;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  margin-top: 18px;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 62ch;
  color: var(--hh-white);
  font-size: clamp(16px, 1.2vw, 18px);
  line-height: 1.78;
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
}

.page-about .about-hero__figure::before {
  content: "";
  position: absolute;
  inset: -10px -10px 40% auto;
  width: 2px;
  background: linear-gradient(to bottom, var(--hh-cyan), transparent);
  pointer-events: none;
}

.page-about .about-hero__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));
  filter: saturate(0.9) brightness(0.92);
}

@media (min-width: 780px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    align-items: end;
  }
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  background: var(--hh-line);
  border: 1px solid var(--hh-line);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
}

.page-about .about-facts__item {
  margin: 0;
  padding: 18px 16px;
  background: var(--hh-deep);
}

.page-about .about-facts dt {
  margin: 0 0 8px;
  font-family: var(--hh-font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--hh-mist);
}

.page-about .about-facts dd {
  margin: 0;
  font-family: var(--hh-font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(19px, 2.3vw, 26px);
  color: var(--hh-white);
}

@media (min-width: 700px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

@media (min-width: 940px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1fr) 250px;
    align-items: start;
  }
}

.page-about .about-note {
  position: relative;
  padding: 22px 24px 22px 28px;
  background: var(--hh-deep);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-note::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: var(--hh-cyan);
}

.page-about .about-note__title {
  margin: 0 0 10px;
  font-family: var(--hh-font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--hh-cyan);
}

.page-about .about-note p {
  margin: 0;
  color: var(--hh-mist);
  font-size: 14px;
  line-height: 1.72;
}

/* ---------- 工序 ---------- */
.page-about .about-steps {
  display: grid;
  gap: 12px;
  margin: 0 0 clamp(24px, 3vw, 36px);
}

.page-about .about-step {
  background: var(--hh-deep);
  border: 1px solid var(--hh-line);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
  transition: background-color 0.2s var(--hh-ease), border-color 0.2s var(--hh-ease);
}

.page-about .about-step[open] {
  background: var(--hh-raise);
  border-color: rgba(31, 245, 192, 0.35);
}

.page-about .about-step__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
  font-family: var(--hh-font-display);
  font-weight: 800;
  font-size: 17px;
  color: var(--hh-white);
}

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

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

.page-about .about-step__summary:focus-visible {
  outline: 2px solid var(--hh-cyan);
  outline-offset: -2px;
}

.page-about .about-step__no {
  flex: 0 0 auto;
  font-family: var(--hh-font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--hh-cyan);
}

.page-about .about-step__name {
  flex: 1 1 auto;
}

.page-about .about-step__cue {
  flex: 0 0 auto;
  font-family: var(--hh-font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--hh-mist);
  white-space: nowrap;
}

.page-about .about-step__cue::after {
  content: "展开";
}

.page-about .about-step[open] .about-step__cue {
  color: var(--hh-cyan);
}

.page-about .about-step[open] .about-step__cue::after {
  content: "收起";
}

.page-about .about-step__body {
  padding: 0 20px 20px;
}

.page-about .about-step__body p {
  margin: 0;
  color: var(--hh-white);
  font-size: 15px;
  line-height: 1.76;
}

@media (min-width: 860px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-method__figure {
  margin: 0;
}

.page-about .about-method__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  filter: saturate(0.9) brightness(0.94);
}

/* ---------- 团队分组切换 ---------- */
.page-about .about-tabs {
  position: relative;
}

.page-about .about-tabs__radio {
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 1px;
  opacity: 0;
  margin: 0;
}

.page-about .about-tabs__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.page-about .about-tabs__tab {
  display: inline-block;
  padding: 10px 22px;
  border: 1px solid var(--hh-line);
  color: var(--hh-mist);
  font-family: var(--hh-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: color 0.2s var(--hh-ease), background-color 0.2s var(--hh-ease), border-color 0.2s var(--hh-ease);
}

.page-about .about-tabs__tab:hover {
  color: var(--hh-white);
  border-color: var(--hh-cyan);
}

.page-about #about-crew-a:checked ~ .about-tabs__bar label[for="about-crew-a"],
.page-about #about-crew-b:checked ~ .about-tabs__bar label[for="about-crew-b"],
.page-about #about-crew-c:checked ~ .about-tabs__bar label[for="about-crew-c"] {
  color: var(--hh-ink);
  background: var(--hh-cyan);
  border-color: var(--hh-cyan);
}

.page-about #about-crew-a:focus-visible ~ .about-tabs__bar label[for="about-crew-a"],
.page-about #about-crew-b:focus-visible ~ .about-tabs__bar label[for="about-crew-b"],
.page-about #about-crew-c:focus-visible ~ .about-tabs__bar label[for="about-crew-c"] {
  outline: 2px solid var(--hh-orange);
  outline-offset: 3px;
}

.page-about .about-tabs__panel {
  display: none;
  padding: clamp(20px, 3vw, 32px);
  background: var(--hh-deep);
  border: 1px solid var(--hh-line);
  border-top: 2px solid var(--hh-cyan);
}

.page-about #about-crew-a:checked ~ .about-tabs__panels .about-tabs__panel[data-panel="a"],
.page-about #about-crew-b:checked ~ .about-tabs__panels .about-tabs__panel[data-panel="b"],
.page-about #about-crew-c:checked ~ .about-tabs__panels .about-tabs__panel[data-panel="c"] {
  display: block;
}

.page-about .about-tabs__panel p {
  margin: 0 0 16px;
  max-width: 64ch;
  color: var(--hh-white);
  font-size: 15px;
  line-height: 1.76;
}

.page-about .about-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .about-list li {
  position: relative;
  padding-left: 20px;
  color: var(--hh-mist);
  font-size: 14px;
  line-height: 1.68;
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  top: 9px;
  left: 0;
  width: 9px;
  height: 2px;
  background: var(--hh-cyan);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(24px, 3vw, 40px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 5px;
  width: 2px;
  background: linear-gradient(to bottom, var(--hh-cyan), var(--hh-line) 52%, var(--hh-orange));
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(24px, 3vw, 36px) 34px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: 6px;
  left: 0;
  width: 12px;
  height: 12px;
  background: var(--hh-cyan);
  box-shadow: 0 0 0 4px var(--hh-ink);
}

.page-about .about-timeline__item:nth-child(even)::before {
  background: var(--hh-orange);
}

.page-about .about-timeline__phase {
  margin: 0 0 6px;
  font-family: var(--hh-font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--hh-cyan);
}

.page-about .about-timeline__item:nth-child(even) .about-timeline__phase {
  color: var(--hh-orange);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-size: clamp(19px, 2.1vw, 24px);
}

.page-about .about-timeline__text {
  margin: 0 0 12px;
  max-width: 64ch;
  color: var(--hh-white);
  font-size: 15px;
  line-height: 1.76;
}

.page-about .about-timeline__stat {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  margin: 0;
  padding: 7px 15px;
  background: var(--hh-deep);
  border: 1px solid var(--hh-line);
  font-family: var(--hh-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--hh-mist);
  transition: color 0.2s var(--hh-ease), border-color 0.2s var(--hh-ease), background-color 0.2s var(--hh-ease);
}

.page-about .about-timeline__stat strong {
  font-size: 17px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--hh-cyan);
}

.page-about .about-timeline__item:hover .about-timeline__stat,
.page-about .about-timeline__item:focus-within .about-timeline__stat {
  color: var(--hh-white);
  background: var(--hh-raise);
  border-color: var(--hh-cyan);
}

/* ---------- 协作网络 ---------- */
.page-about .about-network__grid {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
  align-items: start;
}

.page-about .about-network__figure {
  margin: 0;
}

.page-about .about-network__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  filter: saturate(0.88) brightness(0.92);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

@media (min-width: 920px) {
  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }
}

/* ---------- 长期使用 ---------- */
.page-about .about-trust__grid {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(26px, 3.6vw, 44px);
}

.page-about .about-trust__card {
  padding: clamp(20px, 2.6vw, 30px);
  background: var(--hh-deep);
  border: 1px solid var(--hh-line);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

.page-about .about-trust__num {
  margin: 0 0 14px;
  font-family: var(--hh-font-mono);
  font-size: clamp(17px, 1.8vw, 21px);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  color: var(--hh-cyan);
}

.page-about .about-trust__card h3 {
  margin: 0 0 10px;
}

.page-about .about-trust__card p:last-child {
  margin: 0;
  color: var(--hh-mist);
  font-size: 14px;
  line-height: 1.74;
}

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

.page-about .about-cta {
  display: grid;
  gap: 22px;
  padding: clamp(24px, 3.4vw, 40px);
  background: linear-gradient(118deg, var(--hh-deep), var(--hh-raise));
  border-top: 3px solid var(--hh-orange);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px));
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 64ch;
  color: var(--hh-white);
  font-size: clamp(15px, 1.1vw, 17px);
  line-height: 1.76;
}

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

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

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 16px 0 0;
  font-family: var(--hh-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .about-cta__links a {
  color: var(--hh-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 245, 192, 0.45);
  padding-bottom: 2px;
  transition: color 0.2s var(--hh-ease), border-color 0.2s var(--hh-ease);
}

.page-about .about-cta__links a:hover,
.page-about .about-cta__links a:focus-visible {
  color: var(--hh-white);
  border-color: var(--hh-white);
}

.page-about .about-cta__links a:focus-visible {
  outline: 2px solid var(--hh-cyan);
  outline-offset: 3px;
}

.page-about .about-cta__dot {
  color: var(--hh-line);
}

@media (min-width: 880px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

/* ---------- 滚动渐入 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s var(--hh-ease), transform 0.4s var(--hh-ease);
}

.page-about [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about * {
    transition-duration: 0.01ms !important;
  }
}
<<<END>>>