.page-about {
  --ab-rule: rgba(57, 242, 208, 0.22);
  --ab-rule-soft: rgba(57, 242, 208, 0.12);
  --ab-tilt: -1.4deg;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.5rem, 4vw, 2.5rem) 0 clamp(2.75rem, 7vw, 5rem);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  right: -18%;
  bottom: -55%;
  width: 70vw;
  height: 70vw;
  max-width: 760px;
  max-height: 760px;
  background: radial-gradient(circle, rgba(57, 242, 208, 0.16), transparent 66%);
  pointer-events: none;
}

.page-about .ab-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(1.75rem, 5vw, 3rem);
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .ab-hero__title {
  margin: 0.7rem 0 0;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(2.1rem, 7.4vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: -0.03em;
  color: var(--white);
}

.page-about .ab-hero__lede {
  margin-top: 1.15rem;
  max-width: 46ch;
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.page-about .ab-hero__side {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: flex-start;
}

.page-about .ab-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  width: 100%;
  margin: 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--ab-rule);
}

.page-about .ab-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  min-width: 0;
}

.page-about .ab-hero__fact dt {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 4vw, 1.75rem);
  color: var(--cyan);
  line-height: 1;
}

.page-about .ab-hero__fact dd {
  margin: 0;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--text-soft);
}

/* ---------- 品牌起点 ---------- */
.page-about .ab-origin {
  padding: clamp(2.75rem, 7vw, 5rem) 0;
}

.page-about .ab-origin__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .ab-origin__text p {
  margin: 1rem 0 0;
  max-width: 54ch;
  line-height: 1.75;
}

.page-about .ab-origin__text .editorial-title {
  margin: 0.6rem 0 0;
}

.page-about .ab-origin__text .link-underline {
  display: inline-block;
  margin-top: 1.4rem;
}

.page-about .ab-origin__media {
  margin: 0;
  align-self: start;
}

.page-about .ab-origin__media .media-frame__img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 章节头 ---------- */
.page-about .ab-section-head {
  max-width: 60ch;
}

.page-about .ab-section-head__title {
  margin: 0.6rem 0 0;
}

.page-about .ab-section-head .lede {
  margin-top: 1rem;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  padding: clamp(2.75rem, 7vw, 5rem) 0;
}

.page-about .ab-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.75rem;
  padding-bottom: 0.25rem;
}

.page-about .ab-jump__link {
  display: inline-block;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--ab-rule);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--mist);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .ab-jump__link:hover,
.page-about .ab-jump__link:focus-visible,
.page-about .ab-jump__link[aria-current="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .ab-axis {
  position: relative;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-axis::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6rem;
  bottom: 1.5rem;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(57, 242, 208, 0.12));
}

.page-about .ab-axis__item {
  position: relative;
  padding: 0 0 2.25rem 1.75rem;
}

.page-about .ab-axis__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 0.55rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .ab-axis__item:hover::before,
.page-about .ab-axis__item:focus-within::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(57, 242, 208, 0.18);
}

.page-about .ab-axis__year {
  display: block;
  font-size: clamp(2rem, 7.2vw, 3.1rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
  opacity: 0.55;
  transition: opacity var(--dur) var(--ease);
}

.page-about .ab-axis__item:hover .ab-axis__year,
.page-about .ab-axis__item:focus-within .ab-axis__year {
  opacity: 1;
}

.page-about .ab-axis__body {
  margin-top: 0.6rem;
}

.page-about .ab-axis__title {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-about .ab-axis__body p {
  margin: 0.55rem 0 0;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--text-soft);
}

/* ---------- 服务版图 ---------- */
.page-about .ab-map-section {
  padding: clamp(2.75rem, 7vw, 5rem) 0;
}

.page-about .ab-map {
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ink-line);
}

.page-about .ab-map__row {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.5rem 1rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--ink-line);
  transition: background-color var(--dur) var(--ease);
}

.page-about .ab-map__num {
  font-size: 1rem;
  font-weight: 700;
  color: var(--orange);
  letter-spacing: 0.06em;
  line-height: 1.6;
}

.page-about .ab-map__body {
  min-width: 0;
}

.page-about .ab-map__title {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.1875rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .ab-map__body p {
  margin: 0.5rem 0 0;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.72;
}

.page-about .ab-map__link {
  grid-column: 2;
  justify-self: start;
  align-self: center;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.03em;
  color: var(--orange-deep);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease);
}

.page-about .ab-map__link:hover,
.page-about .ab-map__link:focus-visible {
  color: var(--orange);
}

/* ---------- 团队与社区 ---------- */
.page-about .ab-team {
  padding: clamp(2.75rem, 7vw, 5rem) 0;
}

.page-about .ab-team__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  margin-top: 2rem;
}

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

.page-about .ab-team__figure .media-frame__img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-team__figure--offset {
  margin-top: 1.75rem;
  transform: rotate(var(--ab-tilt));
}

.page-about .ab-team__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-team__stat {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--ab-rule-soft);
  border-radius: var(--radius-sm);
  background: rgba(18, 53, 44, 0.55);
}

.page-about .ab-team__stat-num {
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-team__stat-label {
  font-size: 0.8125rem;
  color: var(--text-soft);
  line-height: 1.4;
}

.page-about .ab-team__lead {
  margin: 0;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--white);
}

.page-about .ab-team__right p + p {
  margin-top: 1rem;
}

.page-about .ab-team__right p {
  max-width: 56ch;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--text-soft);
}

.page-about .ab-team__right .ab-team__lead {
  color: var(--white);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partners {
  padding: clamp(2.75rem, 7vw, 5rem) 0;
}

.page-about .ab-partners__grid {
  display: grid;
  gap: 1.25rem;
  margin-top: 2rem;
}

.page-about .ab-partners__col {
  padding: 1.35rem 1.25rem 1.4rem;
  background: var(--paper-2);
  border-radius: var(--radius);
  border-left: 3px solid var(--gold);
}

.page-about .ab-partners__badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--ink);
  opacity: 0.55;
}

.page-about .ab-partners__col h3 {
  margin: 0.45rem 0 0;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  font-weight: 800;
  color: var(--ink);
}

.page-about .ab-partners__col p {
  margin: 0.6rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: rgba(11, 31, 26, 0.78);
}

/* ---------- 认证与联系 ---------- */
.page-about .ab-trust {
  padding: clamp(2.75rem, 7vw, 5rem) 0;
}

.page-about .ab-trust__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

.page-about .ab-trust__seal {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: flex-start;
}

.page-about .ab-trust__seal-note {
  margin: 0;
  max-width: 30ch;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--text-soft);
}

.page-about .ab-trust__title {
  margin: 0;
  font-family: var(--font-sans);
  font-size: clamp(1.5rem, 4.5vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--white);
}

.page-about .ab-trust__body p {
  margin: 0.9rem 0 0;
  max-width: 56ch;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--text-soft);
}

.page-about .ab-trust__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.6rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-map__row {
    grid-template-columns: 3.5rem minmax(0, 1fr) auto;
    align-items: start;
    gap: 1rem 1.5rem;
  }

  .page-about .ab-map__link {
    grid-column: 3;
    align-self: start;
    margin-top: 0.35rem;
  }

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

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

  .page-about .ab-trust__grid {
    grid-template-columns: 220px minmax(0, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.75fr);
    align-items: end;
  }

  .page-about .ab-hero__side {
    padding-bottom: 0.5rem;
  }

  .page-about .ab-origin__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);
    align-items: center;
  }

  .page-about .ab-origin__media {
    transform: rotate(1.2deg);
  }

  .page-about .ab-axis__item {
    display: grid;
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 2rem;
    padding-left: 2.25rem;
    padding-bottom: 2.75rem;
  }

  .page-about .ab-axis__item::before {
    top: 0.75rem;
  }

  .page-about .ab-axis__year {
    font-size: clamp(2.6rem, 4.4vw, 3.5rem);
  }

  .page-about .ab-axis__body {
    margin-top: 0;
  }

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

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

  .page-about .ab-partners__col:nth-child(2) {
    transform: translateY(1.25rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-team__figure--offset,
  .page-about .ab-origin__media,
  .page-about .ab-partners__col:nth-child(2) {
    transform: none;
  }

  .page-about .ab-jump__link,
  .page-about .ab-axis__year,
  .page-about .ab-axis__item::before,
  .page-about .ab-map__row,
  .page-about .ab-map__link {
    transition: none;
  }
}