.page-about {
  --about-rail: 152px;
  --about-gap: 56px;
  --about-paper-ink: #3B4A61;
  --about-green-ink: #0E8F63;
  background: var(--hth-night);
  color: var(--hth-on-dark);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about__hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--hth-header-h) + 46px) 0 0;
  background: linear-gradient(168deg, #04101F 0%, #08203C 54%, var(--hth-night) 100%);
}
.page-about__hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--hth-line-strong), transparent);
}
.page-about__glow {
  position: absolute;
  top: -28%;
  left: -12%;
  width: 132%;
  height: 136%;
  pointer-events: none;
  opacity: .72;
  background:
    radial-gradient(46% 42% at 20% 32%, rgba(40, 240, 168, .22), transparent 64%),
    radial-gradient(52% 48% at 84% 12%, rgba(30, 78, 140, .72), transparent 68%),
    radial-gradient(40% 40% at 62% 84%, rgba(255, 138, 61, .10), transparent 72%);
}

.page-about__hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: end;
  padding-bottom: 64px;
}

.page-about__crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--hth-on-dark-dim);
}
.page-about__crumbs li {
  display: inline-flex;
  align-items: center;
}
.page-about__crumbs li + li::before {
  content: "／";
  margin-right: 8px;
  color: rgba(157, 176, 202, .6);
}
.page-about__crumbs a {
  color: var(--hth-on-dark-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .25s var(--hth-ease), border-color .25s var(--hth-ease);
}
.page-about__crumbs a:hover {
  color: var(--hth-neon);
  border-bottom-color: var(--hth-neon);
}

.page-about__eyebrow {
  margin: 26px 0 0;
  font-family: var(--hth-serif);
  font-size: 14px;
  letter-spacing: .2em;
  color: var(--hth-mist);
  text-transform: none;
}

.page-about__title {
  margin: 16px 0 0;
  font-family: var(--hth-sans);
  font-size: clamp(34px, 8.4vw, 68px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.02em;
  color: #FFFFFF;
  max-width: 16ch;
}

.page-about__lede {
  margin: 24px 0 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.85;
  color: #C3D2E6;
}

.page-about__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.page-about__hero-figure {
  margin: 0;
  border: 1px solid var(--hth-line-strong);
  background: var(--hth-stand);
}
.page-about__hero-figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about__stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  border-top: 1px solid var(--hth-line);
}
.page-about__stat {
  margin: 0;
  padding: 22px 18px 26px 0;
  border-bottom: 1px solid var(--hth-line);
}
.page-about__stat dt {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--hth-on-dark-dim);
}
.page-about__stat dd {
  margin: 0;
  font-size: 15px;
  color: var(--hth-on-dark);
}
.page-about__statnum {
  margin-right: 4px;
  font-size: 26px;
  font-weight: 600;
  color: var(--hth-neon);
  letter-spacing: -.01em;
}

/* ---------- 叙事骨架 ---------- */
.page-about__story {
  position: relative;
}
.page-about__story::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 88px;
  bottom: 60px;
  width: 1px;
  display: none;
  background: linear-gradient(180deg, rgba(30, 78, 140, 0), var(--hth-line-strong) 6%, var(--hth-line-strong) 94%, rgba(30, 78, 140, 0));
}

.page-about__chapter {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  padding: 56px 0;
}

.page-about__rail {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.page-about__rail::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 6px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 1px solid var(--hth-neon);
  background: var(--hth-night);
  box-shadow: 0 0 0 5px rgba(40, 240, 168, .09);
  display: none;
}
.page-about__railno {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--hth-neon);
}
.page-about__railtag {
  font-family: var(--hth-serif);
  font-size: 15px;
  letter-spacing: .16em;
  color: var(--hth-on-dark-dim);
}

.page-about__h2 {
  margin: 0 0 20px;
  font-family: var(--hth-sans);
  font-size: clamp(25px, 4.2vw, 38px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -.018em;
  color: #FFFFFF;
}

.page-about__p {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--hth-on-dark-dim);
}

.page-about__note {
  margin: 22px 0 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--hth-on-dark-dim);
}

.page-about__link {
  display: inline-block;
  margin-top: 18px;
  font-size: 15px;
  font-weight: 600;
  color: var(--hth-neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(40, 240, 168, .45);
  padding-bottom: 3px;
  transition: color .25s var(--hth-ease), border-color .25s var(--hth-ease);
}
.page-about__link:hover {
  color: var(--hth-mist);
  border-bottom-color: var(--hth-mist);
}

.page-about__pull {
  margin: 0;
  padding: 38px 0;
  max-width: 44ch;
  font-family: var(--hth-serif);
  font-size: clamp(19px, 3vw, 27px);
  line-height: 1.55;
  color: var(--hth-mist);
  border-top: 1px solid var(--hth-line);
  border-bottom: 1px solid var(--hth-line);
}

/* ---------- 时间线 ---------- */
.page-about__timeline {
  margin-top: 36px;
  border-top: 1px solid var(--hth-line-strong);
}
.page-about__tl-rail {
  display: flex;
  overflow-x: auto;
  border-bottom: 1px solid var(--hth-line);
  scrollbar-width: none;
}
.page-about__tl-rail::-webkit-scrollbar {
  display: none;
}
.page-about__tl-node {
  position: relative;
  flex: 0 0 auto;
  padding: 16px 22px 15px;
  border: 0;
  background: transparent;
  font-family: var(--hth-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--hth-on-dark-dim);
  cursor: pointer;
  transition: color .25s var(--hth-ease);
}
.page-about__tl-node::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: -1px;
  height: 2px;
  background: var(--hth-neon);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .3s var(--hth-ease);
}
.page-about__tl-node:hover {
  color: var(--hth-mist);
}
.page-about__tl-node[aria-selected="true"] {
  color: var(--hth-neon);
}
.page-about__tl-node[aria-selected="true"]::after {
  transform: scaleX(1);
}
.page-about__tl-body {
  padding-top: 26px;
}
.page-about__tl-panel[hidden] {
  display: none;
}
.page-about__tl-panel {
  animation: about-panel-in .34s var(--hth-ease);
}
.page-about__tl-title {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: #FFFFFF;
}
.page-about__tl-text {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--hth-on-dark-dim);
}
@keyframes about-panel-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 团队 ---------- */
.page-about__team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  margin-top: 32px;
}
.page-about__donut-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: center;
}
.page-about__donut {
  display: block;
  width: 100%;
  max-width: 210px;
  height: auto;
  margin-inline: auto;
}
.page-about__seg {
  transition: opacity .3s var(--hth-ease);
}
.page-about__donut-num {
  font-family: var(--hth-mono);
  font-size: 42px;
  font-weight: 600;
  fill: #FFFFFF;
}
.page-about__donut-cap {
  font-family: var(--hth-sans);
  font-size: 14px;
  fill: #9DB0CA;
}

.page-about__legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about__legend-item {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  gap: 6px 12px;
  align-items: center;
  padding: 14px 16px;
  border: 1px solid var(--hth-line);
  transition: border-color .3s var(--hth-ease), background-color .3s var(--hth-ease);
}
.page-about__legend-item:hover {
  border-color: rgba(40, 240, 168, .6);
  background: rgba(40, 240, 168, .05);
}
.page-about__legend-dot {
  width: 12px;
  height: 12px;
  display: block;
}
.page-about__legend-dot--edit {
  background: var(--hth-neon);
}
.page-about__legend-dot--data {
  background: var(--hth-touch);
}
.page-about__legend-dot--prod {
  background: var(--hth-orange);
}
.page-about__legend-name {
  font-size: 15px;
  color: #FFFFFF;
}
.page-about__legend-num {
  font-size: 18px;
  font-weight: 600;
  color: var(--hth-neon);
}
.page-about__legend-item p {
  grid-column: 2 / -1;
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--hth-on-dark-dim);
}

.page-about__team-figure {
  margin: 0;
  border: 1px solid var(--hth-line);
  background: var(--hth-stand);
}
.page-about__team-figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 流程 ---------- */
.page-about__flow {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--hth-line-strong);
}
.page-about__flow-step {
  padding: 26px 0 28px;
  border-bottom: 1px solid var(--hth-line);
}
.page-about__flow-no {
  display: block;
  margin-bottom: 12px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--hth-neon);
}
.page-about__flow-title {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: #FFFFFF;
}
.page-about__flow-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--hth-on-dark-dim);
}

.page-about__flow-figure {
  margin: 36px 0 0;
}
.page-about__flow-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--hth-line);
}

/* ---------- 画册白：立场 ---------- */
.page-about__paper {
  margin-top: 24px;
  padding: 76px 0 84px;
  background: var(--hth-paper);
  color: var(--hth-ink);
  border-top: 1px solid var(--hth-line);
  border-bottom: 1px solid rgba(14, 23, 38, .1);
}
.page-about__chapter--flat {
  padding: 0;
}
.page-about__paper .page-about__railno {
  color: var(--about-green-ink);
}
.page-about__paper .page-about__railtag {
  color: var(--hth-note);
}
.page-about__paper .page-about__h2 {
  color: var(--hth-ink);
}
.page-about__paper .page-about__p {
  color: var(--about-paper-ink);
}
.page-about__paper .page-about__chapter {
  padding: 0;
}

.page-about__beliefs {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  border-top: 1px solid rgba(14, 23, 38, .14);
}
.page-about__belief {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 18px;
  padding: 26px 0;
  border-bottom: 1px solid rgba(14, 23, 38, .14);
}
.page-about__belief-no {
  padding-top: 3px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--about-green-ink);
}
.page-about__belief h3 {
  margin: 0 0 9px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -.012em;
  color: var(--hth-ink);
}
.page-about__belief p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.82;
  color: #46536A;
}

/* ---------- 合作 ---------- */
.page-about__partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 32px;
}
.page-about__partner {
  padding: 28px 24px 30px;
  border: 1px solid var(--hth-line);
  background: linear-gradient(158deg, rgba(15, 44, 82, .78), rgba(6, 21, 43, .32));
  transition: border-color .3s var(--hth-ease), transform .3s var(--hth-ease);
}
.page-about__partner:hover {
  border-color: rgba(40, 240, 168, .58);
  transform: translateY(-4px);
}
.page-about__partner-big {
  display: block;
  font-family: var(--hth-mono);
  font-size: clamp(40px, 6vw, 58px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--hth-neon);
}
.page-about__partner-big--range {
  font-size: clamp(24px, 3.6vw, 32px);
  letter-spacing: -.01em;
}
.page-about__partner h3 {
  margin: 16px 0 10px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: #FFFFFF;
}
.page-about__partner p {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--hth-on-dark-dim);
}

/* ---------- 读者 ---------- */
.page-about__regions {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  max-width: 540px;
}
.page-about__region {
  display: grid;
  grid-template-columns: 66px minmax(0, 1fr);
  gap: 16px;
  align-items: center;
}
.page-about__region-name {
  font-size: 15px;
  color: #FFFFFF;
}
.page-about__region-track {
  display: block;
  height: 6px;
  background: rgba(198, 208, 221, .13);
  overflow: hidden;
}
.page-about__region-fill {
  display: block;
  height: 100%;
  width: calc(var(--share, .5) * 100%);
  background: linear-gradient(90deg, var(--hth-neon), rgba(40, 240, 168, .22));
}

/* ---------- 尾段 CTA ---------- */
.page-about__cta {
  position: relative;
  overflow: hidden;
  padding: 88px 0 96px;
  border-top: 1px solid var(--hth-line);
  background: linear-gradient(202deg, var(--hth-night) 0%, #071A35 55%, #04101F 100%);
}
.page-about__cta::before {
  content: "";
  position: absolute;
  inset: auto -16% -62% -16%;
  height: 96%;
  pointer-events: none;
  background: radial-gradient(50% 60% at 50% 100%, rgba(40, 240, 168, .16), transparent 70%);
}
.page-about__cta-inner {
  position: relative;
  z-index: 1;
}
.page-about__cta .page-about__eyebrow {
  margin-top: 0;
}
.page-about__cta-title {
  margin: 14px 0 16px;
  max-width: 20ch;
  font-family: var(--hth-sans);
  font-size: clamp(26px, 4.6vw, 44px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -.022em;
  color: #FFFFFF;
}
.page-about__cta-text {
  margin: 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--hth-on-dark-dim);
}
.page-about__cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about__stat {
    padding: 24px 22px 28px;
    border-right: 1px solid var(--hth-line);
  }
  .page-about__stat:first-child {
    padding-left: 0;
  }
  .page-about__stat:last-child {
    border-right: 0;
  }
  .page-about__stat:nth-child(2n) {
    border-right: 1px solid var(--hth-line);
  }
}

@media (min-width: 760px) {
  .page-about__flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about__flow-step {
    padding: 26px 22px 30px;
    border-bottom: 0;
    border-left: 1px solid var(--hth-line);
  }
  .page-about__flow-step:first-child {
    padding-left: 0;
    border-left: 0;
  }
  .page-about__partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about__partner--wide {
    grid-column: 1 / -1;
  }
}

@media (min-width: 960px) {
  .page-about__hero-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: 64px;
    padding-bottom: 78px;
  }
  .page-about__donut-wrap {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 30px;
    align-items: center;
  }
  .page-about__donut {
    margin-inline: 0;
  }
}

@media (min-width: 1024px) {
  .page-about__story::before {
    display: block;
  }
  .page-about__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 9px;
    padding-left: 46px;
  }
  .page-about__rail::before {
    display: block;
  }
  .page-about__chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
    padding: 80px 0;
  }
  .page-about__paper .page-about__chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
    padding: 0;
  }
  .page-about__team {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, .8fr);
    gap: 48px;
    align-items: center;
  }
  .page-about__pull {
    margin-left: calc(var(--about-rail) + var(--about-gap));
    padding: 46px 0;
  }
  .page-about__cta {
    padding: 112px 0 120px;
  }
}

@media (min-width: 1200px) {
  .page-about__team {
    grid-template-columns: minmax(0, 1.62fr) minmax(0, .78fr);
    gap: 60px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .page-about__partner:hover {
    transform: none;
  }
}
<<<END>>>

.page-about {
  --share: 1rem;
}