.page-about {
  --ab-block: 52px;
  --ab-card-radius: var(--lc-radius);
  --ab-tag-radius: var(--lc-radius-sm);
  background: var(--lc-bg);
  color: var(--lc-text);
  padding-bottom: 8px;
}

/* 面包屑 */
.page-about .ab-crumb {
  padding-top: 20px;
  padding-bottom: 4px;
}

/* 首屏 */
.page-about .ab-hero {
  padding-top: 16px;
}

.page-about .ab-hero__panel {
  background: var(--lc-white);
  border: 1px solid var(--lc-line);
  border-left: 4px solid var(--lc-orange);
  border-radius: var(--ab-card-radius);
  box-shadow: var(--lc-shadow-1);
  padding: 22px 18px;
}

.page-about .ab-hero__title {
  margin: 10px 0 12px;
  font-size: 27px;
  line-height: 1.28;
  font-weight: 800;
  color: var(--lc-ink);
  letter-spacing: -0.01em;
}

.page-about .ab-hero__lead {
  margin: 0 0 20px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--lc-text);
  max-width: 44em;
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 通用区块 */
.page-about .ab-block {
  margin-top: var(--ab-block);
}

.page-about .ab-head {
  margin-bottom: 20px;
}

.page-about .ab-head__title {
  margin: 8px 0 0;
  font-size: 22px;
  line-height: 1.32;
  font-weight: 800;
  color: var(--lc-ink);
}

.page-about .ab-head--dark .lc-eyebrow {
  color: rgba(255, 255, 255, 0.66);
}

.page-about .ab-head--dark .ab-head__title {
  color: var(--lc-white);
}

/* 品牌在做的事 */
.page-about .ab-doing__grid {
  display: grid;
  gap: 22px;
}

.page-about .ab-doing__prose p {
  margin: 0 0 14px;
}

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

.page-about .ab-figures {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-content: start;
}

.page-about .ab-figure {
  background: var(--lc-white);
  border: 1px solid var(--lc-line);
  border-radius: var(--ab-card-radius);
  padding: 14px 14px 15px;
  box-shadow: var(--lc-shadow-1);
}

.page-about .ab-figure__num {
  display: block;
  font-family: var(--lc-font-mono);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--lc-orange);
}

.page-about .ab-figure__label {
  display: block;
  margin-top: 5px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--lc-muted);
}

/* 图文容器 */
.page-about .lc-media {
  overflow: hidden;
  border: 1px solid var(--lc-line);
  border-radius: var(--ab-card-radius);
  background: var(--lc-white);
}

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

.page-about .lc-figure {
  margin: 0 0 20px;
}

.page-about .ab-history__figure,
.page-about .ab-team__figure {
  margin-bottom: 18px;
}

.page-about .lc-figure__cap {
  margin-top: 9px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--lc-muted);
}

/* 权益区 */
.page-about .ab-benefits__lead {
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--lc-text);
  max-width: 46em;
}

.page-about .ab-benefits__figure {
  margin: 0 0 22px;
}

.page-about .ab-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 18px;
}

.page-about .ab-filter .lc-filter__btn {
  font: inherit;
  font-size: 13px;
  line-height: 1;
  padding: 10px 15px;
  border: 1px solid var(--lc-line);
  border-radius: 999px;
  background: var(--lc-white);
  color: var(--lc-text);
  cursor: pointer;
  transition: border-color 160ms var(--lc-ease), background-color 160ms var(--lc-ease), color 160ms var(--lc-ease);
}

.page-about .ab-filter .lc-filter__btn:hover {
  border-color: var(--lc-ink-2);
  color: var(--lc-ink);
}

.page-about .ab-filter .lc-filter__btn.is-active,
.page-about .ab-filter .lc-filter__btn[aria-pressed="true"] {
  border-color: var(--lc-orange);
  background: var(--lc-orange-soft);
  color: var(--lc-orange-deep);
  font-weight: 700;
}

.page-about .ab-benefits__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

.page-about .ab-benefit {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--lc-white);
  border: 1px solid var(--lc-line);
  border-top-width: 3px;
  border-top-color: var(--lc-line);
  border-radius: var(--ab-card-radius);
  padding: 15px 16px 16px;
  box-shadow: var(--lc-shadow-1);
  transition: transform 180ms var(--lc-ease), box-shadow 180ms var(--lc-ease), border-color 180ms var(--lc-ease);
}

.page-about .ab-benefit:hover {
  transform: translateY(-2px);
  box-shadow: var(--lc-shadow-2);
  border-left-color: var(--lc-ink-2);
  border-right-color: var(--lc-ink-2);
  border-bottom-color: var(--lc-ink-2);
}

.page-about .ab-benefit--entry {
  border-top-color: var(--lc-orange);
}

.page-about .ab-benefit--doc {
  border-top-color: var(--lc-ink-2);
}

.page-about .ab-benefit--alert {
  border-top-color: var(--lc-teal);
}

.page-about .ab-benefit--service {
  border-top-color: var(--lc-muted);
}

.page-about .ab-benefit__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.page-about .ab-benefit__no {
  font-family: var(--lc-font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--lc-muted);
}

.page-about .ab-tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  border-radius: var(--ab-tag-radius);
  font-family: var(--lc-font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.5;
}

.page-about .ab-tag--entry {
  background: var(--lc-orange-soft);
  color: var(--lc-orange-deep);
}

.page-about .ab-tag--doc {
  background: rgba(51, 70, 92, 0.12);
  color: var(--lc-ink);
}

.page-about .ab-tag--alert {
  background: var(--lc-teal-soft);
  color: var(--lc-teal);
}

.page-about .ab-tag--service {
  background: rgba(107, 123, 140, 0.16);
  color: var(--lc-muted);
}

.page-about .ab-benefit__title {
  margin: 0;
  font-size: 16px;
  line-height: 1.42;
  font-weight: 700;
  color: var(--lc-ink);
}

.page-about .ab-benefit__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--lc-text);
}

.page-about .ab-benefit__more {
  margin-top: auto;
  padding-top: 9px;
  border-top: 1px dashed var(--lc-line);
}

.page-about .ab-benefit__more summary {
  cursor: pointer;
  font-family: var(--lc-font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--lc-muted);
}

.page-about .ab-benefit__more summary:hover {
  color: var(--lc-orange-deep);
}

.page-about .ab-benefit__more p {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--lc-text);
}

/* 发展历程 */
.page-about .ab-history__layout {
  display: grid;
  gap: 20px;
}

.page-about .ab-years__title {
  display: block;
  margin-bottom: 10px;
  font-family: var(--lc-font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--lc-muted);
}

.page-about .ab-years__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-years__item {
  flex: 0 0 auto;
}

.page-about .ab-years__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--lc-line);
  border-radius: 999px;
  background: var(--lc-white);
  color: var(--lc-text);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 160ms var(--lc-ease), color 160ms var(--lc-ease), background-color 160ms var(--lc-ease);
}

.page-about .ab-years__link::before {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lc-teal);
}

.page-about .ab-years__link:hover {
  border-color: var(--lc-ink-2);
  color: var(--lc-ink);
}

.page-about .ab-years__item:last-child .ab-years__link {
  border-color: var(--lc-orange);
  background: var(--lc-orange-soft);
  color: var(--lc-orange-deep);
  font-weight: 700;
}

.page-about .ab-years__item:last-child .ab-years__link::before {
  background: var(--lc-orange);
}

.page-about .ab-stage {
  background: var(--lc-white);
  border: 1px solid var(--lc-line);
  border-radius: var(--ab-card-radius);
  padding: 16px 18px 17px;
  box-shadow: var(--lc-shadow-1);
  scroll-margin-top: calc(var(--lc-bar-h) + 18px);
}

.page-about .ab-stage + .ab-stage {
  margin-top: 12px;
}

.page-about .ab-stage__year {
  margin: 0;
  font-family: var(--lc-font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--lc-teal);
}

.page-about .ab-stage__title {
  margin: 7px 0 8px;
  font-size: 17px;
  line-height: 1.42;
  font-weight: 700;
  color: var(--lc-ink);
}

.page-about .ab-stage__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--lc-text);
}

/* 团队与维护 */
.page-about .ab-team__layout {
  display: grid;
  gap: 22px;
}

.page-about .ab-team__lead {
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--lc-text);
}

.page-about .ab-team__roles {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .ab-role {
  background: var(--lc-white);
  border: 1px solid var(--lc-line);
  border-radius: var(--ab-card-radius);
  padding: 12px 14px;
}

.page-about .ab-role__num {
  display: block;
  font-family: var(--lc-font-mono);
  font-size: 19px;
  font-weight: 700;
  color: var(--lc-ink);
}

.page-about .ab-role__label {
  display: block;
  margin-top: 2px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--lc-muted);
}

.page-about .ab-rhythm {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .ab-rhythm__item {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 14px;
  line-height: 1.72;
  color: var(--lc-text);
}

.page-about .ab-rhythm__item::before {
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  margin-top: 9px;
  border-radius: 50%;
  background: var(--lc-orange);
}

.page-about .ab-team__figure {
  margin: 0;
}

/* 服务规模 */
.page-about .ab-results__inner {
  background: var(--lc-ink);
  border-radius: var(--ab-card-radius);
  padding: 26px 20px 24px;
  box-shadow: var(--lc-shadow-2);
}

.page-about .ab-results__grid {
  margin: 0;
  display: grid;
  gap: 18px 16px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .ab-results__item {
  border-left: 2px solid var(--lc-orange);
  padding-left: 12px;
  min-width: 0;
}

.page-about .ab-results__label {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.7);
}

.page-about .ab-results__num {
  margin: 5px 0 0;
  font-family: var(--lc-font-mono);
  font-size: 23px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--lc-white);
}

.page-about .ab-results__note {
  margin: 22px 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  font-size: 13.5px;
  line-height: 1.78;
  color: rgba(255, 255, 255, 0.78);
  max-width: 46em;
}

/* 开通路径 */
.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-step {
  position: relative;
  background: var(--lc-white);
  border: 1px solid var(--lc-line);
  border-radius: var(--ab-card-radius);
  padding: 16px 16px 17px 58px;
  box-shadow: var(--lc-shadow-1);
}

.page-about .ab-step__no {
  position: absolute;
  left: 16px;
  top: 16px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--lc-orange);
  color: var(--lc-white);
  font-family: var(--lc-font-mono);
  font-size: 13px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .ab-step__title {
  margin: 4px 0 8px;
  font-size: 16px;
  line-height: 1.42;
  font-weight: 700;
  color: var(--lc-ink);
}

.page-about .ab-step__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--lc-text);
}

.page-about .ab-start__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

/* 中等屏 */
@media (min-width: 640px) {
  .page-about .ab-hero__panel {
    padding: 28px 26px;
  }

  .page-about .ab-hero__title {
    font-size: 32px;
  }

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

  .page-about .ab-results__inner {
    padding: 30px 28px 28px;
  }

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

/* 平板与桌面 */
@media (min-width: 860px) {
  .page-about {
    --ab-block: 64px;
  }

  .page-about .ab-head__title {
    font-size: 26px;
  }

  .page-about .ab-hero__title {
    font-size: 38px;
  }

  .page-about .ab-doing__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .ab-team__layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 40px;
    align-items: start;
  }

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

@media (min-width: 1024px) {
  .page-about .ab-benefits__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-history__layout {
    grid-template-columns: 160px minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .ab-years {
    position: sticky;
    top: calc(var(--lc-bar-h) + 24px);
  }

  .page-about .ab-years__list {
    flex-direction: column;
    gap: 10px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .ab-years__item {
    flex: none;
  }

  .page-about .ab-years__link {
    width: 100%;
    justify-content: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-benefit,
  .page-about .ab-filter .lc-filter__btn,
  .page-about .ab-years__link {
    transition: none;
  }

  .page-about .ab-benefit:hover {
    transform: none;
  }
}