.page-about {
  --about-measure: 36em;
  --about-rail: 84px;
  background: var(--lr-bg);
  color: var(--lr-ink);
  overflow-x: clip;
}

.page-about .about-wrap {
  width: 100%;
  max-width: var(--lr-w);
  margin-inline: auto;
  padding-inline: var(--lr-gutter);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 22px 0 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--lr-dim);
}

.page-about .breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--lr-line);
}

.page-about . .breadcrumb__item a,
.page-about .breadcrumb__item a:visited {
  color: var(--lr-dim);
  text-decoration: none;
  transition: color 0.2s var(--lr-ease);
}

.page-about .breadcrumb__item a:hover {
  color: var(--lr-blue);
}

.page-about .breadcrumb__item [aria-current="page"] {
  color: var(--lr-ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: 28px 0;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -160px;
  right: -180px;
  width: 520px;
  height: 520px;
  background:
    radial-gradient(circle at 38% 38%, rgba(10, 132, 255, 0.34), transparent 62%),
    radial-gradient(circle at 70% 66%, rgba(94, 43, 255, 0.3), transparent 60%);
  transform: skewX(-6deg);
  pointer-events: none;
  z-index: 0;
}

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

.page-about .about-hero__eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--lr-dim);
}

.page-about .about-hero__title {
  margin: 18px 0 0;
  font-family: var(--lr-font-display);
  font-weight: 900;
  font-size: clamp(32px, 8.4vw, 84px);
  line-height: 1.04;
  letter-spacing: -0.03em;
  color: var(--lr-ink);
}

.page-about .about-hero__title em {
  display: inline-block;
  font-style: normal;
  transform: skewX(-6deg);
  background: linear-gradient(94deg, var(--lr-blue) 0%, var(--lr-violet) 58%, var(--lr-yellow) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.8;
  color: var(--lr-dim);
}

.page-about .about-hero__media {
  position: relative;
  z-index: 1;
  margin: 34px 0 0;
  border: 1px solid var(--lr-line);
  border-radius: var(--lr-radius);
  overflow: hidden;
  background: var(--lr-panel);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.7) brightness(0.86);
}

/* ---------- 正文骨架 ---------- */
.page-about .about-shell {
  display: grid;
  gap: 8px;
  padding-block: 8px 64px;
}

.page-about .about-flow {
  display: grid;
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  padding-top: 20px;
}

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

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__link {
  display: inline-block;
  white-space: nowrap;
  padding: 6px 12px;
  border: 1px solid var(--lr-line);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--lr-dim);
  text-decoration: none;
  transition: color 0.2s var(--lr-ease), border-color 0.2s var(--lr-ease);
}

.page-about .about-index__link:hover {
  color: var(--lr-ink);
  border-color: var(--lr-blue);
}

/* ---------- 章节 ---------- */
.page-about .chapter {
  display: grid;
  gap: 14px;
  padding-block: 38px;
  border-top: 1px solid var(--lr-line);
  scroll-margin-top: 96px;
}

.page-about .chapter__no {
  font-family: var(--lr-font-display);
  font-weight: 200;
  font-size: clamp(40px, 7.2vw, 92px);
  line-height: 0.86;
  letter-spacing: -0.05em;
  color: var(--lr-paper);
  opacity: 0.24;
  font-variant-numeric: tabular-nums;
}

.page-about .chapter__title {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 0 0 18px;
  font-family: var(--lr-font-display);
  font-weight: 800;
  font-size: clamp(21px, 3.2vw, 31px);
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--lr-ink);
}

.page-about .chapter__title::after {
  content: "";
  flex: 1 1 auto;
  min-width: 20px;
  height: 1px;
  background: linear-gradient(90deg, var(--lr-line), transparent);
}

.page-about .chapter__body > p {
  max-width: var(--about-measure);
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--lr-dim);
}

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

.page-about .chapter__body a {
  color: var(--lr-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(10, 132, 255, 0.35);
  transition: border-color 0.2s var(--lr-ease);
}

.page-about .chapter__body a:hover {
  border-bottom-color: var(--lr-blue);
}

/* ---------- 项目符号列表 ---------- */
.page-about .bullets {
  display: grid;
  gap: 10px;
  max-width: var(--about-measure);
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .bullets li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--lr-dim);
}

.page-about .bullets li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 9px;
  height: 9px;
  background: var(--lr-blue);
  clip-path: polygon(0 0, 100% 50%, 0 100%);
}

.page-about .bullets strong {
  color: var(--lr-ink);
  font-weight: 600;
}

/* ---------- 三条原则 ---------- */
.page-about .principles {
  display: grid;
  gap: 12px;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .principle {
  padding: 20px 18px;
  background: var(--lr-panel);
  border: 1px solid var(--lr-line);
  border-radius: var(--lr-radius);
  transition: border-color 0.25s var(--lr-ease), background 0.25s var(--lr-ease);
}

.page-about .principle:hover {
  border-color: var(--lr-blue);
  background: var(--lr-panel-hi);
}

.page-about .principle__key {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--lr-blue);
}

.page-about .principle__title {
  margin: 10px 0 8px;
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--lr-ink);
}

.page-about .principle__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--lr-dim);
}

/* ---------- 四步流程 ---------- */
.page-about .flow {
  position: relative;
  margin-top: 26px;
}

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

.page-about .flow__steps {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .flow__step {
  padding-top: 14px;
  border-top: 1px solid var(--lr-line);
}

.page-about .flow__badge {
  font-family: var(--lr-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--lr-mint);
}

.page-about .flow__name {
  display: block;
  margin: 6px 0 8px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--lr-ink);
}

.page-about .flow__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--lr-dim);
}

/* ---------- 插图 ---------- */
.page-about .chapter__figure {
  margin: 26px 0 0;
  border: 1px solid var(--lr-line);
  border-radius: var(--lr-radius);
  overflow: hidden;
  background: var(--lr-panel);
}

.page-about .chapter__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.72) brightness(0.9);
}

.page-about .chapter__figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--lr-line);
  font-size: 12px;
  line-height: 1.6;
  color: var(--lr-dim);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  margin-top: 6px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  scrollbar-color: var(--lr-line) transparent;
}

.page-about .timeline::-webkit-scrollbar {
  height: 3px;
}

.page-about .timeline::-webkit-scrollbar-thumb {
  background: var(--lr-line);
}

.page-about .timeline__track {
  display: flex;
  gap: 16px;
  width: max-content;
  margin: 0;
  padding: 4px 2px 18px;
  list-style: none;
}

.page-about .timeline__node {
  flex: 0 0 auto;
  width: min(66vw, 236px);
  padding: 0 6px 0 16px;
  border-left: 1px solid var(--lr-line);
  scroll-snap-align: start;
  transition: border-color 0.3s var(--lr-ease);
}

.page-about .timeline__node:hover {
  border-left-color: var(--lr-blue);
}

.page-about .timeline__year {
  display: block;
  font-family: var(--lr-font-mono);
  font-weight: 300;
  font-size: clamp(38px, 6vw, 62px);
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--lr-ink);
}

.page-about .timeline__label {
  display: block;
  margin: 12px 0 6px;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--lr-blue);
}

.page-about .timeline__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--lr-dim);
}

.page-about .timeline__desc a {
  color: var(--lr-blue);
  text-decoration: none;
}

/* ---------- 引文 ---------- */
.page-about .pullquote {
  max-width: 24em;
  margin: 34px 0 6px;
  padding: 6px 0 6px 22px;
  border-left: 2px solid var(--lr-violet);
  font-family: var(--lr-font-display);
  font-weight: 300;
  font-size: clamp(20px, 3.2vw, 29px);
  line-height: 1.52;
  letter-spacing: -0.01em;
  color: var(--lr-paper);
  opacity: 0.86;
}

/* ---------- 数据条 ---------- */
.page-about .stats {
  display: grid;
  gap: 1px;
  margin: 24px 0 22px;
  padding: 0;
  list-style: none;
  background: var(--lr-line);
  border: 1px solid var(--lr-line);
  border-radius: var(--lr-radius);
  overflow: hidden;
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 16px;
  background: var(--lr-panel);
}

.page-about .stat__num {
  font-family: var(--lr-font-mono);
  font-size: clamp(26px, 4vw, 33px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--lr-ink);
}

.page-about .stat__num--mint {
  color: var(--lr-mint);
}

.page-about .stat__label {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--lr-dim);
}

/* ---------- 页尾分流 ---------- */
.page-about .about-cta {
  position: relative;
  margin-bottom: 72px;
  padding: 40px 22px;
  border: 1px solid var(--lr-line);
  border-radius: var(--lr-radius);
  background:
    linear-gradient(118deg, rgba(10, 132, 255, 0.16), rgba(94, 43, 255, 0.2) 58%, rgba(255, 214, 10, 0.08));
  overflow: hidden;
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--lr-font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.4vw, 31px);
  line-height: 1.32;
  letter-spacing: -0.02em;
  color: var(--lr-ink);
}

.page-about .about-cta__text {
  max-width: 34em;
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.76;
  color: var(--lr-dim);
}

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

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .about-hero {
    padding-block: 40px 0;
  }

  .page-about .flow__path {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 76px;
    opacity: 0.85;
    pointer-events: none;
  }

  .page-about .flow__steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
    padding-top: 58px;
  }

  .page-about .principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-cta {
    padding: 52px 36px;
  }
}

/* ---------- 桌面：大编号轨道 + 右侧细索引 ---------- */
@media (min-width: 820px) {
  .page-about .chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: 40px;
    padding-block: 60px;
  }

  .page-about .chapter__no {
    position: sticky;
    top: 96px;
    justify-self: start;
  }

  .page-about .chapter__body > p {
    font-size: 16.5px;
  }
}

@media (min-width: 1024px) {
  .page-about {
    --about-rail: 96px;
  }

  .page-about .about-shell {
    grid-template-columns: minmax(0, 1fr) 176px;
    column-gap: 56px;
    padding-block: 20px 96px;
  }

  .page-about .about-flow {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-index {
    grid-column: 2;
    grid-row: 1;
    align-self: start;
    position: sticky;
    top: 88px;
    padding-top: 60px;
  }

  .page-about .about-index__title {
    display: block;
    margin: 0 0 14px;
    font-size: 11px;
    letter-spacing: 0.2em;
    color: var(--lr-dim);
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-index__link {
    padding: 9px 0 9px 12px;
    border: 0;
    border-left: 1px solid var(--lr-line);
    border-radius: 0;
    font-size: 12.5px;
    letter-spacing: 0.02em;
  }

  .page-about .about-index__link:hover {
    border-left-color: var(--lr-blue);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__title em,
  .page-about .about-hero::after {
    transform: none;
  }

  .page-about .principle,
  .page-about .timeline__node,
  .page-about .about-index__link {
    transition: none;
  }
}
<<<END>>>