.page-about {
  background: var(--midnight-900);
  overflow-x: hidden;
}

.page-about .ab-hero {
  padding-top: 1.5rem;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

.page-about .ab-hero__title {
  margin: 0.9rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.7rem, 10vw, 5.6rem);
  line-height: 0.96;
  letter-spacing: -0.04em;
  color: var(--off-white);
}

.page-about .ab-mark {
  font-style: normal;
  color: var(--green);
  display: inline-block;
}

.page-about .ab-hero__lede {
  margin: 1.5rem 0 0;
  max-width: 46rem;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--cool-gray);
}

.page-about .ab-hero__meta {
  list-style: none;
  margin: 1.9rem 0 0;
  padding: 1.2rem 0 0;
  border-top: var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.6rem;
}

.page-about .ab-hero__meta li {
  position: relative;
  padding-left: 0.9rem;
  color: var(--off-white);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
}

.page-about .ab-hero__meta li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 5px;
  height: 5px;
  margin-top: -2.5px;
  background: var(--green);
  transform: rotate(45deg);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 2rem;
}

.page-about .ab-hero__visual {
  position: relative;
}

.page-about .ab-hero__visual::before {
  content: "";
  position: absolute;
  inset: 1.4rem -0.9rem -1.2rem 1.4rem;
  background: linear-gradient(135deg, rgba(57, 255, 136, 0.14), rgba(47, 123, 255, 0.06) 55%, transparent 85%);
  border: var(--line);
  z-index: 0;
}

.page-about .ab-hero__visual .dj-figure {
  position: relative;
  z-index: 1;
  margin: 0;
}

/* 左右分置的章节题头 + 正文 */
.page-about .ab-split {
  display: grid;
  gap: 1.6rem;
}

.page-about .ab-split__title {
  border-top: var(--line);
  padding-top: 1.3rem;
}

.page-about .ab-split__body p {
  margin: 0 0 1.1rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--cool-gray);
}

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

.page-about .ab-split__body a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .ab-split__body a:hover,
.page-about .ab-split__body a:focus-visible {
  color: var(--green);
  border-bottom-color: var(--green);
}

.page-about .ab-split__aside {
  margin: 0.9rem 0 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--cool-gray);
}

/* 服务版图 */
.page-about .ab-scale__head {
  max-width: 52rem;
}

.page-about .ab-scale__note {
  margin: 1rem 0 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--cool-gray);
}

.page-about .ab-stats {
  list-style: none;
  margin: 2.4rem 0 0;
  padding: 0;
  border-top: var(--line);
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.6rem 0;
  border-bottom: var(--line);
}

.page-about .ab-stat__num {
  font-family: var(--font-data);
  font-size: clamp(2rem, 7vw, 2.9rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--green);
}

.page-about .ab-stat__label {
  font-family: var(--font-display);
  font-size: 1.125rem;
  letter-spacing: 0.02em;
  color: var(--off-white);
}

.page-about .ab-stat__note {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--cool-gray);
}

/* 时间线 */
.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.75rem;
  position: relative;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0.4rem;
  bottom: 0.4rem;
  width: 1px;
  background: var(--steel-700);
}

.page-about .ab-timeline__item {
  position: relative;
  padding: 0 0 1.9rem;
}

.page-about .ab-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: -1.75rem;
  top: 0.42rem;
  width: 9px;
  height: 9px;
  background: var(--steel-700);
  transform: rotate(45deg);
  transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .ab-timeline__item:hover::before,
.page-about .ab-timeline__item:focus-within::before {
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(57, 255, 136, 0.14);
}

.page-about .ab-timeline__year {
  display: block;
  color: var(--green);
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
}

.page-about .ab-timeline__title {
  margin: 0.5rem 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--off-white);
}

.page-about .ab-timeline__body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--cool-gray);
}

/* 内容体系 */
.page-about .ab-channels__head {
  max-width: 52rem;
}

.page-about .ab-channels__lede {
  margin: 1rem 0 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--cool-gray);
}

.page-about .ab-channel-list {
  margin-top: 2.4rem;
  border-bottom: var(--line);
}

.page-about .ab-channel {
  display: grid;
  gap: 0.45rem;
  padding: 1.7rem 0;
  border-top: var(--line);
  transition: background 0.3s var(--ease);
}

.page-about .ab-channel:hover {
  background: linear-gradient(90deg, rgba(57, 255, 136, 0.05), transparent 60%);
}

.page-about .ab-channel__idx {
  color: var(--green);
  font-size: 0.8125rem;
  letter-spacing: 0.16em;
}

.page-about .ab-channel__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--off-white);
}

.page-about .ab-channel__desc {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--cool-gray);
}

.page-about .ab-channel__desc a,
.page-about .ab-channels__link a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .ab-channel__desc a:hover,
.page-about .ab-channels__link a:hover,
.page-about .ab-channel__desc a:focus-visible,
.page-about .ab-channels__link a:focus-visible {
  color: var(--green);
  border-bottom-color: var(--green);
}

.page-about .ab-channels__link {
  margin: 1.6rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--cool-gray);
}

/* 团队 */
.page-about .ab-team__grid {
  display: grid;
  gap: 2.4rem;
  align-items: start;
}

.page-about .ab-team__intro p {
  margin: 1.1rem 0 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--cool-gray);
}

.page-about .ab-team__bars {
  list-style: none;
  margin: 1.9rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.95rem;
}

.page-about .ab-team-row {
  display: grid;
  grid-template-columns: 5.5rem minmax(0, 1fr) 2.4rem;
  align-items: center;
  gap: 0.85rem;
}

.page-about .ab-team-row__name {
  font-size: 0.8125rem;
  color: var(--off-white);
  letter-spacing: 0.04em;
}

.page-about .ab-team-row__track {
  position: relative;
  display: block;
  height: 6px;
  background: var(--midnight-800);
  border: var(--line);
}

.page-about .ab-team-row__fill {
  position: absolute;
  inset: 0 auto 0 0;
  display: block;
  background: linear-gradient(90deg, var(--steel-700), var(--green));
}

.page-about .ab-fill--32 { width: 100%; }
.page-about .ab-fill--21 { width: 66%; }
.page-about .ab-fill--18 { width: 56%; }
.page-about .ab-fill--15 { width: 47%; }

.page-about .ab-team-row__num {
  text-align: right;
  font-size: 0.875rem;
  color: var(--green);
}

.page-about .ab-team__link {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--cool-gray);
}

.page-about .ab-team__link a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .ab-team__link a:hover,
.page-about .ab-team__link a:focus-visible {
  color: var(--green);
  border-bottom-color: var(--green);
}

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

/* 合作与荣誉 */
.page-about .ab-partners__grid {
  display: grid;
  gap: 2.2rem;
  align-items: center;
}

.page-about .ab-partners__body p {
  margin: 1.1rem 0 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--cool-gray);
}

.page-about .ab-partners__link a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .ab-partners__link a:hover,
.page-about .ab-partners__link a:focus-visible {
  color: var(--green);
  border-bottom-color: var(--green);
}

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

/* 接下来 */
.page-about .ab-next__grid {
  display: grid;
  gap: 2.2rem;
  align-items: start;
}

.page-about .ab-next__copy p {
  margin: 1.1rem 0 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--cool-gray);
  max-width: 42rem;
}

.page-about .ab-next__links {
  display: grid;
  gap: 0;
  border-top: var(--line);
}

.page-about .ab-next__link {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1.05rem 0.25rem 1.05rem 0;
  border-bottom: var(--line);
  text-decoration: none;
  transition: padding-left 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .ab-next__link:hover,
.page-about .ab-next__link:focus-visible {
  padding-left: 0.75rem;
  background: linear-gradient(90deg, rgba(47, 123, 255, 0.1), transparent 70%);
}

.page-about .ab-next__link-label {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--off-white);
  transition: color 0.25s var(--ease);
}

.page-about .ab-next__link:hover .ab-next__link-label,
.page-about .ab-next__link:focus-visible .ab-next__link-label {
  color: var(--green);
}

.page-about .ab-next__link-note {
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--cool-gray);
}

@media (min-width: 860px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 3.5rem;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: 3rem;
  }

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

  .page-about .ab-stat {
    border-bottom: 0;
    border-top: var(--line);
    padding: 1.7rem 1.5rem 0.4rem 0;
  }

  .page-about .ab-stat + .ab-stat {
    border-left: var(--line);
    padding-left: 1.5rem;
  }

  .page-about .ab-channel {
    grid-template-columns: 3rem minmax(0, 13rem) minmax(0, 1fr);
    gap: 0.5rem 2rem;
    align-items: baseline;
    padding: 2rem 0;
  }

  .page-about .ab-channel__name {
    font-size: 1.75rem;
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 3.5rem;
    align-items: center;
  }

  .page-about .ab-partners__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    gap: 3.5rem;
  }

  .page-about .ab-next__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 3.5rem;
    align-items: center;
  }

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

  .page-about .ab-next__link {
    padding: 1.25rem 1.1rem;
    border-top: var(--line);
  }

  .page-about .ab-next__link:nth-child(odd) {
    border-right: var(--line);
  }
}

@media (min-width: 1180px) {
  .page-about .ab-hero__grid {
    gap: 4.5rem;
  }

  .page-about .ab-hero__visual::before {
    inset: 1.8rem -1.4rem -1.5rem 1.8rem;
  }
}