.page-about {
  background: var(--void);
  color: var(--white);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: calc(var(--header-h) + clamp(44px, 8vw, 116px)) 0 clamp(52px, 7vw, 104px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(118% 88% at 86% 2%, rgba(34, 224, 255, .15), transparent 58%),
    radial-gradient(88% 72% at 2% 98%, rgba(122, 77, 255, .17), transparent 62%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -22%;
  right: -14%;
  z-index: -1;
  width: min(60vw, 720px);
  aspect-ratio: 1 / 1;
  pointer-events: none;
  clip-path: polygon(28% 0, 100% 0, 100% 100%, 0 72%);
  background: linear-gradient(112deg, rgba(34, 224, 255, .13), rgba(122, 77, 255, .07) 58%, transparent 100%);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(30px, 5vw, 68px);
  margin-top: clamp(26px, 4vw, 52px);
}

.page-about .about-kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--grey);
}

.page-about .about-title {
  margin: 16px 0 0;
  font-size: clamp(2.5rem, 8.6vw, 6.2rem);
  font-weight: 300;
  line-height: 1.0;
  letter-spacing: -.015em;
  color: var(--white);
}

.page-about .about-lede {
  margin: clamp(22px, 3vw, 34px) 0 0;
  max-width: 58ch;
  font-size: clamp(1rem, 1.35vw, 1.125rem);
  line-height: 1.85;
  color: var(--grey);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  border: 1px solid var(--line-soft);
  border-radius: 18px;
  overflow: hidden;
  background: var(--line-soft);
}

.page-about .about-stat {
  padding: 18px 16px;
  background: var(--panel);
}

.page-about .about-stat dt {
  margin: 0;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--grey);
}

.page-about .about-stat dd {
  margin: 10px 0 0;
  font-size: clamp(1.6rem, 3.4vw, 2rem);
  line-height: 1;
  color: var(--white);
}

/* ---------- 版心与章节索引 ---------- */

.page-about .about-layout {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  padding-bottom: clamp(64px, 9vw, 132px);
}

.page-about .about-index {
  display: none;
}

.page-about .about-index-title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--grey);
}

.page-about .about-index-list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 16px;
  display: grid;
  gap: 12px;
  border-left: 1px solid var(--line-soft);
}

.page-about .about-index-link {
  display: flex;
  gap: 10px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--grey);
  text-decoration: none;
  transition: color .22s var(--ease);
}

.page-about .about-index-link .mono {
  color: var(--cyan-deep);
}

.page-about .about-index-link:hover,
.page-about .about-index-link:focus-visible {
  color: var(--white);
  outline: none;
}

.page-about .about-index-link:hover .mono,
.page-about .about-index-link:focus-visible .mono {
  color: var(--cyan);
}

.page-about .about-index-note {
  margin: 20px 0 0 16px;
  font-size: 11px;
  line-height: 1.6;
  color: var(--grey);
}

/* ---------- 通用章节 ---------- */

.page-about .about-section {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-section + .about-section {
  margin-top: clamp(56px, 8vw, 112px);
  padding-top: clamp(44px, 6vw, 84px);
  position: relative;
}

.page-about .about-section + .about-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(34, 224, 255, .38), rgba(122, 77, 255, .22) 42%, transparent 92%);
}

.page-about .about-index-num {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--cyan);
}

.page-about .about-h2 {
  margin: 0 0 clamp(26px, 4.4vw, 62px);
  max-width: 24ch;
  font-size: clamp(1.7rem, 4.6vw, 3.3rem);
  font-weight: 300;
  line-height: 1.14;
  letter-spacing: -.008em;
  color: var(--white);
}

.page-about .about-h2--close {
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-about .about-h3 {
  margin: 0 0 10px;
  font-size: clamp(1.05rem, 1.7vw, 1.25rem);
  font-weight: 500;
  line-height: 1.4;
  color: var(--white);
}

.page-about .about-prose p {
  margin: 0 0 1.4em;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--grey);
}

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

/* ---------- 校对四步 ---------- */

.page-about .about-workflow-grid {
  display: grid;
  gap: clamp(32px, 5vw, 60px);
  margin-top: clamp(32px, 4.5vw, 56px);
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(24px, 3.5vw, 40px);
}

.page-about .about-step {
  display: flex;
  gap: clamp(16px, 2.4vw, 26px);
  align-items: flex-start;
}

.page-about .about-step-ring {
  position: relative;
  flex: none;
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: radial-gradient(circle at 50% 50%, rgba(34, 224, 255, .12), transparent 72%);
}

.page-about .about-step-ring::after {
  content: "";
  position: absolute;
  inset: 9px;
  border-radius: 50%;
  border: 1px solid var(--line-soft);
  pointer-events: none;
}

.page-about .about-step--1 .about-step-ring { width: 56px; height: 56px; }
.page-about .about-step--2 .about-step-ring { width: 66px; height: 66px; }
.page-about .about-step--3 .about-step-ring { width: 86px; height: 86px; }
.page-about .about-step--4 .about-step-ring { width: 98px; height: 98px; }

.page-about .about-step--3 .about-step-ring,
.page-about .about-step--4 .about-step-ring {
  border-color: rgba(34, 224, 255, .46);
}

.page-about .about-step-idx {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--grey);
}

.page-about .about-step--3 .about-step-idx,
.page-about .about-step--4 .about-step-idx {
  color: var(--cyan);
}

.page-about .about-step-body p {
  margin: 0;
  max-width: 46ch;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--grey);
}

/* ---------- 图片容器 ---------- */

.page-about .about-figure {
  position: relative;
  margin: 0;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--panel);
}

.page-about .about-figure-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.85) contrast(1.04);
}

.page-about .about-figure .media-caption {
  display: block;
  padding: 12px 16px;
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--grey);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 字段口径表 ---------- */

.page-about .about-fields {
  margin-top: clamp(28px, 4vw, 48px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-fields-head {
  display: none;
  padding: 0 12px 12px;
  border-bottom: 1px solid var(--line);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--grey);
}

.page-about .about-field {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-field > summary {
  display: grid;
  gap: 8px;
  padding: 20px 12px;
  cursor: pointer;
  list-style: none;
  transition: background-color .22s var(--ease);
}

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

.page-about .about-field > summary:hover {
  background: var(--glass);
}

.page-about .about-field[open] > summary {
  background: var(--glass);
}

.page-about .about-field-key {
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .about-field-def {
  font-size: .95rem;
  line-height: 1.75;
  color: var(--grey);
}

.page-about .about-field-val {
  font-size: 12px;
  line-height: 1.7;
  color: var(--white);
  opacity: .78;
}

.page-about .about-field-more {
  padding: 0 12px 22px;
  background: var(--glass);
}

.page-about .about-field-more p {
  margin: 0;
  max-width: 68ch;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--grey);
}

/* ---------- 十年时间线 ---------- */

.page-about .about-tl-figure {
  position: relative;
  margin: 0 0 clamp(32px, 4.5vw, 56px);
  border-radius: 22px;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--panel);
}

.page-about .about-tl-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .28;
  filter: saturate(.65) contrast(1.08);
}

.page-about .about-tl-inner {
  position: relative;
  padding: clamp(22px, 4vw, 52px) clamp(14px, 3vw, 44px);
  background: linear-gradient(180deg, rgba(5, 7, 14, .38), rgba(5, 7, 14, .88));
}

.page-about .about-timeline-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .tl-axis {
  stroke: rgba(138, 147, 166, .42);
  stroke-width: 1;
}

.page-about .tl-dot {
  fill: var(--amber);
}

.page-about .tl-count,
.page-about .tl-label {
  font-family: var(--font-mono);
  text-anchor: middle;
  fill: var(--grey);
}

.page-about .tl-count {
  font-size: 15px;
}

.page-about .tl-label {
  font-size: 13px;
}

.page-about .tl-node--now .tl-dot {
  fill: var(--cyan);
}

.page-about .tl-node--now .tl-count,
.page-about .tl-node--now .tl-label {
  fill: var(--cyan);
}

.page-about .about-milestones {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  counter-reset: none;
}

.page-about .about-milestone {
  display: grid;
  gap: 10px;
  padding-top: 20px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-milestone-span {
  margin: 0;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--amber);
}

.page-about .about-milestone p:last-child {
  margin: 0;
  max-width: 62ch;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--grey);
}

/* ---------- 渠道与引用 ---------- */

.page-about .about-network-grid {
  display: grid;
  gap: clamp(28px, 4.5vw, 52px);
  margin-top: clamp(26px, 3.6vw, 44px);
}

.page-about .about-network-stats {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--line-soft);
  border-radius: 18px;
  overflow: hidden;
  background: var(--line-soft);
}

.page-about .about-network-stat {
  padding: 20px 18px;
  background: var(--panel);
}

.page-about .about-network-num {
  margin: 0;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-network-lbl {
  margin: 10px 0 0;
  font-size: 12px;
  line-height: 1.65;
  color: var(--grey);
}

/* ---------- 团队岗位 ---------- */

.page-about .about-team {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2vw, 22px);
}

.page-about .about-team-card {
  padding: clamp(22px, 2.8vw, 32px);
  border: 1px solid var(--line-soft);
  border-radius: 20px;
  background: var(--panel);
  transition: border-color .24s var(--ease), background-color .24s var(--ease);
}

.page-about .about-team-card:hover {
  border-color: rgba(34, 224, 255, .34);
  background: var(--glass);
}

.page-about .about-team-idx {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--violet);
}

.page-about .about-team-card p:last-child {
  margin: 0;
  font-size: .92rem;
  line-height: 1.78;
  color: var(--grey);
}

/* ---------- 收尾 ---------- */

.page-about .about-close {
  margin-top: clamp(56px, 8vw, 108px);
  padding: clamp(32px, 5vw, 60px) clamp(22px, 4vw, 48px);
  border: 1px solid var(--line-soft);
  border-radius: 24px;
  background:
    linear-gradient(112deg, rgba(34, 224, 255, .09), rgba(122, 77, 255, .09) 62%, transparent 100%),
    var(--panel);
}

.page-about .about-close-lede {
  margin: 0 0 clamp(24px, 3.4vw, 36px);
  max-width: 58ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--grey);
}

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

/* ---------- 动效 ---------- */

.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .42s var(--ease), transform .42s var(--ease);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .about-fields-head,
  .page-about .about-field > summary {
    grid-template-columns: 128px minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: baseline;
    gap: 24px;
  }

  .page-about .about-fields-head {
    display: grid;
  }

  .page-about .about-milestone {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 28px;
    align-items: baseline;
  }

  .page-about .about-milestone-span {
    padding-top: 4px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(248px, .6fr);
    align-items: end;
  }

  .page-about .about-stats {
    align-self: end;
  }

  .page-about .about-workflow-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }

  .page-about .about-figure--network {
    margin-top: 6px;
  }

  .page-about .about-network-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }

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

@media (min-width: 1080px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) 148px;
    align-items: start;
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 32px);
    align-self: start;
  }
}

@media (min-width: 1280px) {
  .page-about .about-fields-head,
  .page-about .about-field > summary {
    grid-template-columns: 148px minmax(0, 1.45fr) minmax(0, 1fr);
  }
}

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

  .page-about .about-field > summary,
  .page-about .about-team-card,
  .page-about .about-index-link {
    transition: none;
  }
}
<<<END>>>