.page-about {
  background: var(--paper);
  color: var(--text-ink);
}

.page-about .breadcrumbs {
  padding-top: 20px;
  padding-bottom: 6px;
  font-size: 13px;
  color: var(--text-ink);
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink-900);
  color: var(--paper);
  padding: 40px 0 100px;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -150px;
  right: -110px;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(15, 191, 168, 0.32), rgba(15, 191, 168, 0) 68%);
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6px;
  background: var(--orange);
}

.page-about .ab-hero__cut {
  position: absolute;
  left: -10%;
  right: -10%;
  bottom: -58px;
  height: 116px;
  background: var(--paper);
  transform: rotate(-2.4deg);
  transform-origin: 50% 100%;
  pointer-events: none;
}

.page-about .ab-hero .shell {
  position: relative;
  z-index: 2;
}

.page-about .ab-hero .eyebrow {
  color: var(--teal-soft);
}

.page-about .ab-hero h1 {
  margin: 12px 0 0;
  font-size: 30px;
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-hero .lede {
  margin: 18px 0 0;
  max-width: 48ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(246, 248, 250, 0.82);
}

.page-about .ab-hero__actions {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 32px;
}

.page-about .ab-hero__facts {
  display: grid;
  gap: 1px;
  background: rgba(143, 227, 214, 0.24);
  border: 1px solid rgba(143, 227, 214, 0.3);
  border-radius: 2px;
  align-self: start;
}

.page-about .ab-fact {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  background: var(--ink-900);
}

.page-about .ab-fact__num {
  font-size: 20px;
  font-weight: 700;
  color: var(--teal-soft);
  white-space: nowrap;
}

.page-about .ab-fact__label {
  font-size: 13px;
  line-height: 1.5;
  color: rgba(246, 248, 250, 0.76);
}

/* ---------- 区块与标题 ---------- */
.page-about .ab-block {
  padding: 54px 0;
}

.page-about .ab-block--tight {
  padding: 12px 0 56px;
}

.page-about .ab-block--mist {
  background: var(--mist);
}

.page-about .ab-block--ink {
  background: var(--ink-900);
  color: var(--paper);
}

.page-about .ab-head {
  max-width: 62ch;
  margin-bottom: 34px;
}

.page-about .ab-head h2 {
  margin: 10px 0 0;
  font-size: 24px;
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .ab-head__note {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-ink);
}

.page-about .ab-dash {
  display: block;
  width: 34px;
  height: 3px;
  margin-top: 20px;
  background: var(--teal);
}

.page-about .ab-block--ink .ab-head h2,
.page-about .ab-block--ink .ab-head__note {
  color: var(--paper);
}

.page-about .ab-block--ink .ab-head__note {
  color: rgba(246, 248, 250, 0.78);
}

.page-about .ab-block--ink .eyebrow {
  color: var(--teal-soft);
}

.page-about .ab-block--ink .ab-dash {
  background: var(--orange);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline__wrap {
  display: grid;
  gap: 36px;
}

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

.page-about .ab-timeline__list::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 30px;
  bottom: 30px;
  width: 2px;
  background: linear-gradient(180deg, var(--teal) 0%, var(--teal-soft) 72%, rgba(143, 227, 214, 0) 100%);
}

.page-about .ab-stage {
  border-bottom: 1px dashed var(--line);
}

.page-about .ab-stage__head {
  display: grid;
  grid-template-columns: 40px 1fr 16px;
  gap: 16px;
  align-items: center;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-stage__head::-webkit-details-marker {
  display: none;
}

.page-about .ab-stage__head::marker {
  content: "";
}

.page-about .ab-stage__head::after {
  content: "";
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--teal);
  border-bottom: 2px solid var(--teal);
  transform: rotate(45deg);
  justify-self: center;
  margin-top: -5px;
  transition: transform var(--dur) var(--ease), margin var(--dur) var(--ease);
}

.page-about .ab-stage[open] .ab-stage__head::after {
  transform: rotate(-135deg);
  margin-top: 4px;
}

.page-about .ab-stage__index {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--teal);
  color: var(--ink-900);
  font-size: 13px;
  font-weight: 700;
  position: relative;
  z-index: 1;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .ab-stage[open] .ab-stage__index {
  background: var(--teal);
  color: var(--ink-900);
}

.page-about .ab-stage__title {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--ink-900);
}

.page-about .ab-stage__panel {
  padding: 0 0 22px 56px;
}

.page-about .ab-stage__panel p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-ink);
}

.page-about .ab-stage__points {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .ab-stage__points li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-ink);
}

.page-about .ab-stage__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 9px;
  height: 2px;
  background: var(--teal);
}

/* ---------- 图形 ---------- */
.page-about .ab-figure {
  margin: 0;
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--mist);
}

.page-about .ab-figure figcaption {
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-ink);
  opacity: 0.82;
}

.page-about .ab-block--ink .ab-figure img {
  border-color: rgba(143, 227, 214, 0.34);
  background: var(--ink-700);
}

.page-about .ab-block--ink .ab-figure figcaption {
  color: rgba(246, 248, 250, 0.74);
  opacity: 1;
}

.page-about .ab-figure--wide {
  margin-top: 30px;
}

/* ---------- 团队 ---------- */
.page-about .ab-team-grid {
  display: grid;
  gap: 18px;
}

.page-about .ab-role {
  padding: 24px 22px 26px;
  display: grid;
  gap: 10px;
  align-content: start;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .ab-role__icon {
  display: inline-flex;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--teal);
  background: rgba(143, 227, 214, 0.35);
  color: var(--ink-700);
}

.page-about .ab-role__icon svg {
  width: 22px;
  height: 22px;
}

.page-about .ab-role h3 {
  margin: 6px 0 0;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--ink-900);
}

.page-about .ab-role__num {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--orange-deep);
}

.page-about .ab-role p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-ink);
}

/* ---------- 四步流程 ---------- */
.page-about .ab-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .ab-flow__step {
  position: relative;
  border-top: 1px solid var(--line);
  padding: 20px 0 20px 52px;
}

.page-about .ab-flow__step:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .ab-flow__num {
  position: absolute;
  left: 0;
  top: 24px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--orange-deep);
}

.page-about .ab-flow__step h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  color: var(--ink-900);
}

.page-about .ab-flow__step p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-ink);
}

/* ---------- 服务覆盖 ---------- */
.page-about .ab-reach {
  display: grid;
  gap: 32px;
}

.page-about .ab-reach__copy h2 {
  margin: 10px 0 0;
  font-size: 24px;
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-reach__copy p {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(246, 248, 250, 0.82);
}

.page-about .ab-reach__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .ab-reach__list li {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 14px 0;
  border-top: 1px solid rgba(143, 227, 214, 0.24);
  font-size: 15px;
  line-height: 1.7;
  color: rgba(246, 248, 250, 0.82);
}

.page-about .ab-reach__list li:last-child {
  border-bottom: 1px solid rgba(143, 227, 214, 0.24);
}

.page-about .ab-reach__list .mono {
  font-size: 18px;
  font-weight: 700;
  color: var(--teal-soft);
  flex: 0 0 auto;
}

/* ---------- 长期同行 ---------- */
.page-about .ab-longrun {
  display: grid;
  gap: 18px;
}

.page-about .ab-longrun__item {
  padding: 20px 22px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-left: 3px solid var(--teal);
}

.page-about .ab-longrun__item h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  color: var(--ink-900);
}

.page-about .ab-longrun__item p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-ink);
}

.page-about .ab-longrun__more {
  margin: 28px 0 0;
  font-size: 15px;
  line-height: 1.95;
  color: var(--text-ink);
}

.page-about .ab-longrun__more a {
  color: var(--ink-700);
  text-decoration: none;
  border-bottom: 2px solid var(--teal);
  padding-bottom: 1px;
}

.page-about .ab-longrun__more a:hover {
  color: var(--orange-deep);
  border-bottom-color: var(--orange);
}

/* ---------- 尾栏目录 ---------- */
.page-about .ab-index__card {
  padding: 26px 24px 28px;
}

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

.page-about .ab-index__list a {
  display: flex;
  gap: 16px;
  align-items: baseline;
  padding: 11px 0;
  text-decoration: none;
  font-size: 15px;
  color: var(--text-ink);
  border-bottom: 1px dashed var(--line);
}

.page-about .ab-index__list a:hover {
  color: var(--ink-900);
  border-bottom-color: var(--teal);
}

.page-about .ab-index__list .mono {
  font-size: 13px;
  font-weight: 700;
  color: var(--orange-deep);
  min-width: 22px;
}

/* ---------- 悬停 ---------- */
@media (hover: hover) {
  .page-about .ab-role:hover {
    transform: translateY(-2px);
  }
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-hero {
    padding: 56px 0 118px;
  }

  .page-about .ab-hero h1 {
    font-size: 40px;
  }

  .page-about .ab-head h2,
  .page-about .ab-reach__copy h2 {
    font-size: 28px;
  }

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

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

  .page-about .ab-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 32px;
  }

  .page-about .ab-flow__step {
    border-bottom: none;
  }

  .page-about .ab-flow__step:nth-child(n + 3) {
    border-top: 1px solid var(--line);
  }
}

@media (min-width: 960px) {
  .page-about .ab-hero {
    padding: 64px 0 132px;
  }

  .page-about .ab-hero h1 {
    font-size: 48px;
  }

  .page-about .ab-hero .lede {
    font-size: 17px;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.7fr) minmax(260px, 330px);
    gap: 48px;
    align-items: start;
  }

  .page-about .ab-block {
    padding: 72px 0;
  }

  .page-about .ab-head h2,
  .page-about .ab-reach__copy h2 {
    font-size: 32px;
  }

  .page-about .ab-timeline__wrap {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .ab-figure--timeline {
    position: sticky;
    top: calc(var(--brand-bar-h) + 28px);
  }

  .page-about .ab-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 24px;
  }

  .page-about .ab-flow__step {
    border-top: 3px solid var(--teal);
    padding: 20px 0 0;
  }

  .page-about .ab-flow__step:nth-child(n + 3) {
    border-top: 3px solid var(--teal);
  }

  .page-about .ab-flow__num {
    position: static;
    display: block;
    margin-bottom: 10px;
  }

  .page-about .ab-flow__step p {
    margin-top: 10px;
  }

  .page-about .ab-reach {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 52px;
    align-items: center;
  }

  .page-about .ab-index__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 24px;
  }
}
</final>