.page-about .page-about__crumb {
  padding-top: 24px;
}

/* ---------- 首屏 ---------- */
.page-about .page-about__hero {
  position: relative;
  overflow: hidden;
  margin-top: 24px;
  padding: 56px 0 72px;
  border-top: 1px solid var(--yf-line);
  border-bottom: 1px solid var(--yf-line);
  background: linear-gradient(158deg, var(--yf-panel) 0%, var(--yf-void) 62%);
}

.page-about .page-about__hero-shard {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(114deg, transparent 0 44%, rgba(54, 191, 166, 0.10) 44% 57%, transparent 57%),
    linear-gradient(114deg, transparent 0 61%, rgba(232, 184, 92, 0.09) 61% 68%, transparent 68%);
}

.page-about .page-about__hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 40px;
}

.page-about .page-about__hero-copy {
  max-width: 760px;
}

.page-about .page-about__title {
  margin: 12px 0 20px;
  max-width: 18em;
}

.page-about .page-about__lead {
  margin: 0;
  max-width: 46em;
  color: var(--yf-ink);
}

.page-about .page-about__hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--yf-line);
  border: 1px solid var(--yf-line);
}

.page-about .page-about__fact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px;
  background: var(--yf-float);
}

.page-about .page-about__fact-k {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--yf-muted);
}

.page-about .page-about__fact-v {
  font-family: var(--yf-font-mono);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--yf-gold);
}

@media (min-width: 900px) {
  .page-about .page-about__hero {
    padding: 80px 0 96px;
  }
  .page-about .page-about__hero-inner {
    grid-template-columns: minmax(0, 1.65fr) minmax(0, 1fr);
    gap: 64px;
    align-items: end;
  }
}

/* ---------- 正文骨架 ---------- */
.page-about .page-about__body {
  display: grid;
  gap: 40px;
  padding-top: 56px;
  padding-bottom: 96px;
}

.page-about .page-about__rail {
  overflow-x: auto;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--yf-line);
}

.page-about .page-about__toc .yf-toc__list {
  display: flex;
  gap: 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .page-about__toc .yf-toc__link {
  white-space: nowrap;
}

.page-about .page-about__chapter {
  margin-bottom: 88px;
}

.page-about .page-about__chapter:last-of-type {
  margin-bottom: 0;
}

.page-about .page-about__chapter-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 28px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--yf-line);
}

.page-about .page-about__chapter-no {
  flex: none;
  font-family: var(--yf-font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--yf-gold);
}

.page-about .page-about__chapter-title {
  margin: 0;
  font-size: 24px;
  line-height: 1.35;
}

.page-about .page-about__prose {
  max-width: var(--yf-prose);
}

.page-about .page-about__prose p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--yf-ink);
}

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

.page-about .page-about__inline-link {
  margin: 24px 0 0;
  font-size: 15px;
}

@media (min-width: 1040px) {
  .page-about .page-about__body {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 56px;
    padding-top: 88px;
  }
  .page-about .page-about__rail {
    overflow: visible;
    padding-bottom: 0;
    border-bottom: 0;
  }
  .page-about .page-about__rail-inner {
    position: sticky;
    top: calc(var(--yf-header-h) + 28px);
  }
  .page-about .page-about__toc .yf-toc__list {
    display: block;
  }
  .page-about .page-about__toc .yf-toc__list li + li {
    margin-top: 2px;
  }
  .page-about .page-about__chapter-title {
    font-size: 28px;
  }
}

/* ---------- 阶段时间轴 ---------- */
.page-about .page-about__stage-media {
  margin: 32px 0 40px;
}

.page-about .page-about__tl-list {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .page-about__tl-list::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 24px;
  width: 1px;
  background: var(--yf-line);
}

.page-about .page-about__tl-item {
  position: relative;
  padding: 0 0 32px 34px;
}

.page-about .page-about__tl-item:last-child {
  padding-bottom: 0;
}

.page-about .page-about__tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 13px;
  height: 13px;
  border: 1.5px solid var(--yf-gold);
  background: var(--yf-void);
  transition: background 0.2s var(--yf-ease), box-shadow 0.2s var(--yf-ease);
}

.page-about .page-about__tl-item:hover::before {
  background: var(--yf-gold);
  box-shadow: 0 0 0 4px rgba(232, 184, 92, 0.14);
}

.page-about .page-about__tl-year {
  display: block;
  font-family: var(--yf-font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--yf-gold);
}

.page-about .page-about__tl-title {
  margin: 8px 0 8px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--yf-ink);
}

.page-about .page-about__tl-text {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--yf-muted);
}

@media (min-width: 900px) {
  .page-about .page-about__tl-list {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 22px;
  }
  .page-about .page-about__tl-list::before {
    left: 0;
    right: 0;
    top: 6px;
    bottom: auto;
    width: auto;
    height: 1px;
  }
  .page-about .page-about__tl-item {
    padding: 34px 0 0;
  }
  .page-about .page-about__tl-item::before {
    left: 0;
    top: 0;
  }
  .page-about .page-about__tl-text {
    max-width: none;
  }
}

/* ---------- 团队 ---------- */
.page-about .page-about__split {
  display: grid;
  gap: 32px;
}

.page-about .page-about__team-media {
  margin: 0;
}

.page-about .page-about__duty {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--yf-line);
}

.page-about .page-about__duty li {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--yf-line);
}

.page-about .page-about__duty-k {
  font-family: var(--yf-font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--yf-jade);
}

.page-about .page-about__duty-v {
  font-size: 15px;
  line-height: 1.7;
  color: var(--yf-muted);
}

@media (min-width: 900px) {
  .page-about .page-about__split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
    gap: 48px;
    align-items: start;
  }
}

/* ---------- 运营方式 ---------- */
.page-about .page-about__ops {
  display: grid;
  gap: 1px;
  margin-top: 32px;
  background: var(--yf-line);
  border: 1px solid var(--yf-line);
}

.page-about .page-about__ops-block {
  padding: 26px 20px;
  background: var(--yf-panel);
  transition: background 0.2s var(--yf-ease);
}

.page-about .page-about__ops-block:hover {
  background: var(--yf-float);
}

.page-about .page-about__ops-title {
  margin: 0 0 12px;
  font-size: 17px;
  font-weight: 800;
  color: var(--yf-ink);
}

.page-about .page-about__ops-block p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--yf-muted);
}

@media (min-width: 820px) {
  .page-about .page-about__ops {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .page-about__ops-block {
    padding: 30px 24px;
  }
}

/* ---------- 服务规模 ---------- */
.page-about .page-about__scale {
  position: relative;
  overflow: hidden;
  margin-bottom: 88px;
  padding: 40px 20px;
  border: 1px solid var(--yf-line);
  background: var(--yf-panel);
}

.page-about .page-about__scale-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.16;
  pointer-events: none;
}

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

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

.page-about .page-about__scale-lead {
  margin: 0 0 32px;
  max-width: var(--yf-prose);
  font-size: 16px;
  line-height: 1.75;
  color: var(--yf-ink);
}

.page-about .page-about__metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--yf-line);
  border: 1px solid var(--yf-line);
}

.page-about .page-about__metric {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 18px;
  background: var(--yf-void);
  transition: background 0.2s var(--yf-ease);
}

.page-about .page-about__metric:hover {
  background: var(--yf-float);
}

.page-about .page-about__metric-value {
  font-family: var(--yf-font-mono);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--yf-ink);
  transition: color 0.2s var(--yf-ease);
}

.page-about .page-about__metric:hover .page-about__metric-value {
  color: var(--yf-jade-hi);
}

.page-about .page-about__metric-label {
  font-size: 14px;
  line-height: 1.6;
  color: var(--yf-muted);
}

@media (min-width: 720px) {
  .page-about .page-about__scale {
    padding: 56px 40px;
  }
  .page-about .page-about__metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .page-about__metric-value {
    font-size: 30px;
  }
}

/* ---------- 记录与旁注 ---------- */
.page-about .page-about__records-grid {
  display: grid;
  gap: 32px;
}

.page-about .page-about__records-aside {
  padding: 24px 20px;
  border: 1px solid var(--yf-line);
  background: var(--yf-float);
}

.page-about .page-about__aside-title {
  margin: 0 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--yf-line);
  font-family: var(--yf-font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--yf-gold);
}

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

.page-about .page-about__aside-list li + li {
  margin-top: 14px;
}

.page-about .page-about__aside-list .yf-link {
  font-size: 14px;
  line-height: 1.65;
}

@media (min-width: 900px) {
  .page-about .page-about__records-grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 48px;
    align-items: start;
  }
}

/* ---------- 结尾 ---------- */
.page-about .page-about__cta {
  margin-top: 96px;
  padding: 40px 24px;
  border-top: 1px solid var(--yf-line);
  border-bottom: 1px solid var(--yf-line);
  background: linear-gradient(120deg, var(--yf-panel) 0%, var(--yf-float) 100%);
}

.page-about .page-about__cta-title {
  margin: 0 0 12px;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--yf-ink);
}

.page-about .page-about__cta-text {
  margin: 0 0 24px;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--yf-muted);
}

.page-about .page-about__cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

@media (min-width: 720px) {
  .page-about .page-about__cta {
    padding: 56px 48px;
  }
  .page-about .page-about__cta-title {
    font-size: 26px;
  }
}
<<<END>>>