.page-about {
  --about-rail-w: 190px;
  --about-ink-soft: #33465e;
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
  line-height: 1.18;
  margin: 0;
}

.page-about p {
  margin: 0;
}

.page-about .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4vw, 40px) 0 clamp(40px, 6vw, 72px);
  background: linear-gradient(180deg, var(--cream) 0%, var(--cream) 58%, var(--mist) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.75;
  background-image:
    repeating-linear-gradient(90deg, var(--line-soft) 0 1px, transparent 1px 104px),
    repeating-linear-gradient(0deg, var(--line-soft) 0 1px, transparent 1px 104px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -8vw;
  top: -10vh;
  width: 46vw;
  height: 46vw;
  max-width: 560px;
  max-height: 560px;
  border-radius: 50%;
  pointer-events: none;
  background: radial-gradient(circle at 40% 40%, rgba(167, 139, 250, 0.22), transparent 68%);
}

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

.page-about .about-hero .crumbs {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  grid-template-columns: 1fr;
}

.page-about .about-hero h1 {
  font-size: clamp(30px, 6.4vw, 62px);
  font-weight: 800;
  margin: 14px 0 0;
  max-width: 20em;
}

.page-about .about-hero__lede {
  margin-top: 20px;
  max-width: 62ch;
  font-size: clamp(15px, 1.9vw, 17px);
  color: var(--about-ink-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

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

.page-about .fact {
  background: var(--cream);
  padding: 18px 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .fact dt {
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  color: var(--deep);
  letter-spacing: -0.03em;
}

.page-about .fact dt small {
  font-size: 0.5em;
  margin-left: 2px;
  color: var(--slate);
}

.page-about .fact dd {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-muted);
}

/* ---------- 主体两列 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

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

/* ---------- 章节索引 ---------- */
.page-about .about-rail {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-about .about-rail__title {
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: 10px;
}

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

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

.page-about .about-rail__list li {
  flex: 0 0 auto;
}

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  color: var(--deep);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-rail__list a .mono {
  font-size: 11px;
  color: var(--slate);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  border-color: var(--cyan);
  background: var(--mist);
  outline: none;
}

.page-about .about-rail__list a[aria-current="true"] {
  background: var(--deep);
  border-color: var(--deep);
  color: var(--mist);
}

.page-about .about-rail__list a[aria-current="true"] .mono {
  color: var(--cyan);
}

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  padding: clamp(30px, 5vw, 54px) 0;
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: 120px;
}

.page-about .about-block:first-child {
  border-top: none;
  padding-top: clamp(8px, 2vw, 16px);
}

.page-about .about-block__title {
  font-size: clamp(23px, 3.6vw, 38px);
  font-weight: 700;
  margin-top: 10px;
  max-width: 22em;
}

.page-about .about-block__intro {
  margin-top: 16px;
  max-width: 64ch;
  color: var(--about-ink-soft);
  font-size: clamp(15px, 1.8vw, 16px);
}

/* ---------- 起点 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 40px);
  margin-top: 26px;
  align-items: start;
}

.page-about .about-split__text p + p {
  margin-top: 16px;
}

.page-about .about-split__text p {
  max-width: 60ch;
  color: var(--about-ink-soft);
}

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

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--slate);
  border-left: 2px solid var(--cyan);
  padding-left: 10px;
}

.page-about .about-figure--inline {
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .about-figure--shrink .media-frame {
  max-width: 100%;
}

.page-about .about-position {
  margin-top: clamp(28px, 4vw, 44px);
  padding: clamp(20px, 3vw, 30px);
  background: var(--mist);
  border-radius: var(--radius-l);
  border: 1px solid var(--line-soft);
}

.page-about .about-position__title {
  font-size: clamp(17px, 2.4vw, 21px);
  font-weight: 700;
  color: var(--deep);
}

.page-about .about-position__list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}

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

.page-about .about-position__list p {
  margin-top: 8px;
  font-size: 14.5px;
  color: var(--about-ink-soft);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 30px 0 0;
  padding: 0 0 6px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(232px, 82%);
  gap: 18px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .tl-item {
  position: relative;
  padding: 42px 18px 22px;
  background: var(--cream);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  scroll-snap-align: start;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  top: 22px;
  height: 1px;
  background: var(--line);
}

.page-about .tl-item::after {
  content: "";
  position: absolute;
  left: 18px;
  top: 17px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.2);
}

.page-about .tl-item:nth-child(3)::after {
  background: var(--violet);
  box-shadow: 0 0 0 4px rgba(167, 139, 250, 0.22);
}

.page-about .tl-item:hover {
  transform: translateY(-3px);
  border-color: var(--cyan);
}

.page-about .tl-year {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.page-about .tl-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--deep);
  margin-top: 6px;
}

.page-about .tl-text {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 28px;
}

.page-about .team-card {
  position: relative;
  padding: 22px 20px 24px;
  border-radius: var(--radius-m);
  background: var(--mist);
  border: 1px solid var(--line-soft);
  overflow: hidden;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .team-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 3px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

.page-about .team-card--b::before {
  background: var(--moss);
}

.page-about .team-card--c::before {
  background: var(--clay);
}

.page-about .team-card:hover::before,
.page-about .team-card:focus-within::before {
  transform: scaleX(1);
}

.page-about .team-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 26px rgba(11, 37, 69, 0.08);
}

.page-about .team-card__num {
  font-size: clamp(34px, 5vw, 46px);
  font-weight: 700;
  color: var(--deep);
  letter-spacing: -0.04em;
  line-height: 1;
}

.page-about .team-card__name {
  font-size: 17px;
  font-weight: 700;
  margin-top: 10px;
  color: var(--deep);
}

.page-about .team-card__duty {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

.page-about .about-flow {
  margin-top: 26px;
  padding: clamp(20px, 3vw, 28px);
  background: var(--deep);
  border-radius: var(--radius-l);
  color: var(--mist);
}

.page-about .about-flow__label {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-flow__steps {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}

.page-about .about-flow__steps li {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 10px;
  align-items: baseline;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(234, 244, 244, 0.86);
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--line-invert);
}

.page-about .about-flow__steps li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .about-flow__steps .mono {
  color: var(--violet);
  font-size: 12px;
}

/* ---------- 覆盖 ---------- */
.page-about .about-reach {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 40px);
  margin-top: 26px;
  align-items: start;
}

.page-about .about-reach__panel {
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--radius-l);
  background: var(--mist);
  border: 1px solid var(--line-soft);
}

.page-about .reach-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .reach-stats li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: baseline;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .reach-stats li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .reach-stats__num {
  font-size: clamp(26px, 3.6vw, 36px);
  font-weight: 700;
  color: var(--deep);
  letter-spacing: -0.03em;
  line-height: 1;
}

.page-about .reach-stats__num small {
  font-size: 0.48em;
  color: var(--clay);
  margin-left: 1px;
}

.page-about .reach-stats__label {
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

.page-about .about-reach__note {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

/* ---------- 质量 ---------- */
.page-about .quality-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 28px;
}

.page-about .quality-card {
  padding: 20px 16px;
  border-radius: var(--radius-m);
  border: 1px solid var(--line);
  background: var(--cream);
}

.page-about .quality-card--accent {
  background: var(--deep);
  border-color: var(--deep);
}

.page-about .quality-card__num {
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 700;
  color: var(--deep);
  letter-spacing: -0.03em;
  line-height: 1.05;
}

.page-about .quality-card__num small {
  font-size: 0.42em;
  color: var(--slate);
  margin-left: 3px;
  letter-spacing: 0;
}

.page-about .quality-card--accent .quality-card__num {
  color: var(--amber);
}

.page-about .quality-card--accent .quality-card__num small {
  color: rgba(234, 244, 244, 0.7);
}

.page-about .quality-card__label {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-muted);
}

.page-about .quality-card--accent .quality-card__label {
  color: rgba(234, 244, 244, 0.82);
}

.page-about .quality-notes {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.page-about .quality-notes__col h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--deep);
  padding-left: 10px;
  border-left: 3px solid var(--moss);
}

.page-about .quality-notes__col:nth-child(2) h3 {
  border-left-color: var(--cyan);
}

.page-about .quality-notes__col:nth-child(3) h3 {
  border-left-color: var(--clay);
}

.page-about .quality-notes__col p {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

/* ---------- 下一步 ---------- */
.page-about .next-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

.page-about .next-list li {
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.page-about .next-list h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--deep);
}

.page-about .next-list p {
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-ink-soft);
  max-width: 56ch;
}

.page-about .about-cta {
  position: relative;
  margin-top: clamp(30px, 5vw, 48px);
  padding: clamp(26px, 4vw, 44px);
  border-radius: var(--radius-l);
  background: var(--deep);
  color: var(--mist);
  overflow: hidden;
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -90px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.24), transparent 70%);
  pointer-events: none;
}

.page-about .about-cta__text {
  position: relative;
}

.page-about .about-cta h2 {
  font-size: clamp(21px, 3.2vw, 30px);
  font-weight: 700;
  color: var(--cream);
  max-width: 24em;
}

.page-about .about-cta p {
  margin-top: 12px;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(234, 244, 244, 0.82);
  max-width: 58ch;
}

.page-about .about-cta__actions {
  position: relative;
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-about .about-cta__actions .copy-group {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.page-about .about-cta__actions .copy-status {
  font-size: 12px;
  color: var(--cyan);
  min-height: 1em;
}

.page-about .about-cta__link {
  font-size: 13px;
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(245, 158, 11, 0.45);
  padding-bottom: 2px;
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  color: var(--cream);
  border-bottom-color: var(--cream);
  outline: none;
}

/* ---------- 媒体帧约束 ---------- */
.page-about .media-frame img {
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .team-card--b {
    margin-top: 26px;
  }

  .page-about .team-card--c {
    margin-top: 12px;
  }

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

  .page-about .quality-notes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .next-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .next-list li {
    padding: 16px 16px 18px;
    border: 1px solid var(--line);
    border-radius: var(--radius-m);
    background: var(--cream);
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .about-reach {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }

  .page-about .timeline {
    grid-auto-flow: row;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
    overflow-x: visible;
  }

  .page-about .tl-item {
    padding: 44px 18px 24px;
  }

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

@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.85fr);
    align-items: end;
  }

  .page-about .about-hero__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    box-shadow: 0 18px 40px rgba(11, 37, 69, 0.06);
  }

  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-layout__rail {
    position: sticky;
    top: 108px;
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow-x: visible;
    gap: 2px;
  }

  .page-about .about-rail__list a {
    display: flex;
    width: 100%;
    padding: 8px 12px;
    border: none;
    border-left: 2px solid transparent;
    border-radius: 0 var(--radius-s) var(--radius-s) 0;
    white-space: normal;
    line-height: 1.4;
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    background: var(--mist);
    border-left-color: var(--cyan);
  }

  .page-about .about-rail__list a[aria-current="true"] {
    background: rgba(11, 37, 69, 0.06);
    color: var(--deep);
    border-left-color: var(--deep);
  }

  .page-about .about-rail__list a[aria-current="true"] .mono {
    color: var(--clay);
  }

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

  .page-about .about-flow__steps li {
    border-bottom: none;
    border-left: 1px dashed var(--line-invert);
    padding: 0 0 0 12px;
    grid-template-columns: 1fr;
    gap: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-item,
  .page-about .team-card,
  .page-about .team-card::before,
  .page-about .about-rail__list a {
    transition: none;
  }

  .page-about .tl-item:hover,
  .page-about .team-card:hover {
    transform: none;
  }
}
<<<END>>>