.page-about {
  --about-gutter: clamp(16px, 4vw, 40px);
  --about-radius: 18px;
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-wrap {
  padding-top: 18px;
  padding-bottom: 72px;
}

.page-about .breadcrumb {
  margin: 0 0 16px;
  font-size: 13px;
}

.page-about .breadcrumb__link {
  color: var(--muted);
  text-decoration: none;
}

.page-about .breadcrumb__link:hover {
  color: var(--violet);
}

.page-about .breadcrumb__sep {
  color: var(--line-strong);
}

.page-about .kicker {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--amber-deep);
  margin: 0;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  --tick: var(--violet-light);
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--about-radius);
  padding: clamp(22px, 5vw, 56px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -45%;
  right: -20%;
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, rgba(109, 40, 217, 0.6), rgba(109, 40, 217, 0) 68%);
  pointer-events: none;
}

.page-about .about-hero > * {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__kicker {
  color: var(--violet-light);
}

.page-about .about-hero__title {
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(31px, 6.4vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 14px 0 0;
  max-width: 16ch;
}

.page-about .about-hero__lead {
  color: var(--on-dark);
  font-size: 16px;
  line-height: 1.8;
  max-width: 44ch;
  margin: 18px 0 0;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
  border-radius: 12px;
  overflow: hidden;
}

.page-about .about-hero__stats li {
  background: var(--ink);
  padding: 13px 14px;
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--mono);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__lbl {
  display: block;
  margin-top: 3px;
  font-size: 12px;
  color: var(--on-dark);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

/* ---------- 目录与两栏骨架 ---------- */

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 40px;
}

.page-about .about-toc {
  border-top: 1px solid var(--line-strong);
  padding-top: 12px;
  min-width: 0;
}

.page-about .about-toc .toc__title {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 10px;
}

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

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

.page-about .about-toc .toc__link {
  display: block;
  white-space: nowrap;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-toc .toc__link:hover,
.page-about .about-toc .toc__link.is-active {
  color: var(--violet);
  border-color: var(--violet);
  background: rgba(109, 40, 217, 0.07);
}

.page-about .about-toc__note {
  display: none;
  margin: 16px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

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

/* ---------- 章节 ---------- */

.page-about .about-sec {
  scroll-margin-top: 24px;
}

.page-about .about-sec::before {
  content: "";
  display: block;
  width: 34px;
  height: 3px;
  background: var(--amber);
  margin-bottom: 20px;
}

.page-about .about-sec + .about-sec {
  margin-top: 48px;
  padding-top: 44px;
  border-top: 1px solid var(--line);
}

.page-about .section-head {
  margin-bottom: 22px;
}

.page-about .section-head__title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(23px, 3.6vw, 35px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 8px 0 0;
}

.page-about .about-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .prose p {
  font-size: 16px;
  line-height: 1.85;
  margin: 0 0 16px;
  max-width: 35em;
}

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

.page-about .prose a {
  color: var(--violet);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-aside {
  border-left: 2px solid var(--violet-light);
  padding-left: 14px;
}

.page-about .note {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

.page-about .note a {
  color: var(--violet);
  text-decoration: none;
  border-bottom: 1px solid var(--violet-light);
}

.page-about .about-intro {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
  margin: 0 0 24px;
  max-width: 36em;
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 0 0 26px;
}

.page-about .about-figure img {
  width: 100%;
  border-radius: 14px;
  background: var(--cream);
}

.page-about .about-figure__cap {
  display: block;
  margin-top: 8px;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

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

.page-about .about-team-figure img {
  width: 100%;
  border-radius: 14px;
  background: var(--cream);
}

/* ---------- 时间线 ---------- */

.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-tl__item {
  display: grid;
  grid-template-columns: 48px 14px minmax(0, 1fr);
  gap: 0 10px;
  padding: 13px 0;
  outline: none;
}

.page-about .about-tl__year {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--amber-deep);
  padding-top: 3px;
  font-variant-numeric: tabular-nums;
}

.page-about .about-tl__mark {
  position: relative;
  display: block;
}

.page-about .about-tl__mark::before {
  content: "";
  position: absolute;
  left: 6px;
  top: -18px;
  bottom: -18px;
  width: 1px;
  background: var(--line-strong);
}

.page-about .about-tl__mark::after {
  content: "";
  position: absolute;
  left: 2px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: var(--amber);
  transition: background-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-tl__item:first-child .about-tl__mark::before {
  top: 11px;
}

.page-about .about-tl__item:last-child .about-tl__mark::before {
  bottom: auto;
  height: 24px;
}

.page-about .about-tl__title {
  font-family: var(--sans);
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.4;
  margin: 0 0 5px;
  color: var(--ink);
  transition: color 0.2s var(--ease);
}

.page-about .about-tl__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
}

.page-about .about-tl__more {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
  gap: 10px;
}

.page-about .about-team__item {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 14px 15px 16px;
  background: var(--cream);
  border: 1px solid var(--line);
  border-radius: 14px;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-team__num {
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--violet);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__name {
  font-size: 14.5px;
  font-weight: 700;
  margin-top: 4px;
}

.page-about .about-team__desc {
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 流程 ---------- */

.page-about .about-flow {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .about-flow__step {
  border-top: 2px solid var(--ink);
  padding-top: 12px;
  transition: border-color 0.2s var(--ease);
}

.page-about .about-flow__idx {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--amber-deep);
}

.page-about .about-flow__title {
  font-size: 17px;
  font-weight: 700;
  margin: 4px 0 6px;
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 13.8px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-seven {
  margin-top: 26px;
  padding: 18px 18px 16px;
  background: var(--cream);
  border: 1px solid var(--line);
  border-radius: 16px;
}

.page-about .about-seven__lead {
  margin: 0 0 12px;
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1.7;
}

.page-about .about-seven__list {
  list-style: none;
  margin: 0 0 12px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-seven__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-seven__note a {
  color: var(--violet);
  text-decoration: none;
  border-bottom: 1px solid var(--violet-light);
}

/* ---------- 规模 ---------- */

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 17px 15px 18px;
  background: var(--cream);
  border: 1px solid var(--line);
  border-radius: 16px;
  min-width: 0;
}

.page-about .about-stat--wide {
  grid-column: span 2;
}

.page-about .about-stat--ink {
  background: var(--ink);
  border-color: transparent;
  color: var(--paper);
}

.page-about .about-stat--violet {
  background: var(--violet);
  border-color: transparent;
  color: var(--paper);
}

.page-about .about-stat__num {
  font-family: var(--mono);
  font-size: clamp(25px, 4.6vw, 36px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.page-about .about-stat--ink .about-stat__num {
  color: var(--lime);
}

.page-about .about-stat--violet .about-stat__num {
  color: var(--violet-light);
}

.page-about .about-stat__lbl {
  font-size: 13px;
  font-weight: 600;
}

.page-about .about-stat__text {
  margin: 2px 0 0;
  font-size: 12.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-stat--ink .about-stat__text,
.page-about .about-stat--violet .about-stat__text {
  color: var(--on-dark);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  position: relative;
  overflow: hidden;
  margin-top: 52px;
  padding: clamp(24px, 4.6vw, 44px);
  background: var(--brown);
  color: var(--paper);
  border-radius: 20px;
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line-dark) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-dark) 1px, transparent 1px);
  background-size: 44px 44px;
  opacity: 0.35;
  pointer-events: none;
}

.page-about .about-cta > * {
  position: relative;
  z-index: 1;
}

.page-about .about-cta__kicker {
  color: var(--violet-light);
}

.page-about .about-cta__title {
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(22px, 3.8vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 10px 0 0;
}

.page-about .about-cta__body {
  margin: 14px 0 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--on-dark);
}

.page-about .about-cta__body a {
  color: var(--violet-light);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

/* ---------- 悬停与断点 ---------- */

@media (hover: hover) {
  .page-about .about-team__item:hover {
    border-color: var(--violet);
    transform: translateY(-2px);
  }

  .page-about .about-flow__step:hover {
    border-top-color: var(--violet);
  }

  .page-about .about-tl__item:hover .about-tl__title {
    color: var(--violet);
  }

  .page-about .about-tl__item:hover .about-tl__mark::after {
    background: var(--violet);
    transform: scale(1.15);
  }
}

@media (min-width: 760px) {
  .page-about .about-wrap {
    padding-top: 24px;
    padding-bottom: 88px;
  }

  .page-about .about-hero__lead {
    font-size: 17px;
  }

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

  .page-about .about-hero__num {
    font-size: 20px;
  }

  .page-about .about-cols {
    grid-template-columns: minmax(0, 1fr) 210px;
    gap: 30px;
    align-items: start;
  }

  .page-about .about-cols--media {
    grid-template-columns: minmax(0, 1fr) 286px;
    align-items: center;
  }

  .page-about .prose p {
    font-size: 17px;
  }

  .page-about .about-tl__item {
    grid-template-columns: 62px 18px minmax(0, 1fr);
    gap: 0 16px;
    padding: 15px 0;
  }

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

  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

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

  .page-about .about-stat {
    padding: 20px 18px;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: 56px;
    margin-top: 52px;
  }

  .page-about .about-toc {
    position: sticky;
    top: 28px;
    align-self: start;
  }

  .page-about .about-toc .toc__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    border-left: 1px solid var(--line);
  }

  .page-about .about-toc .toc__link {
    white-space: normal;
    margin-left: -1px;
    padding: 8px 0 8px 13px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    font-size: 14px;
    background: none;
  }

  .page-about .about-toc .toc__link:hover,
  .page-about .about-toc .toc__link.is-active {
    background: none;
    border-left-color: var(--violet);
    color: var(--violet);
  }

  .page-about .about-toc__note {
    display: block;
  }

  .page-about .about-sec + .about-sec {
    margin-top: 60px;
    padding-top: 52px;
  }

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

  .page-about .about-tl__more {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.3s var(--ease), opacity 0.3s var(--ease), margin-top 0.3s var(--ease);
  }

  .page-about .about-tl__item:hover .about-tl__more,
  .page-about .about-tl__item:focus .about-tl__more,
  .page-about .about-tl__item:focus-within .about-tl__more {
    max-height: 140px;
    margin-top: 6px;
    opacity: 1;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__title {
    max-width: 18ch;
  }

  .page-about .about-cols {
    grid-template-columns: minmax(0, 1fr) 232px;
    gap: 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  .page-about .about-tl__more {
    max-height: none;
    opacity: 1;
    margin-top: 6px;
  }
}
<<<END>>>