.page-about {
  background: var(--ink-950);
  color: var(--chalk);
  padding-top: var(--header-h);
  padding-bottom: clamp(40px, 7vw, 80px);
}

.page-about .ab-crumbs {
  padding-block: 18px 0;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding-block: clamp(26px, 5vw, 56px) clamp(24px, 4vw, 44px);
}

.page-about .ab-hero-inner {
  max-width: 940px;
}

.page-about .ab-h1 {
  max-width: 15ch;
  margin-block: 10px 0;
}

.page-about .ab-hero-lede {
  max-width: 60ch;
  margin-top: 20px;
  color: var(--chalk);
  opacity: 0.86;
}

.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- 通栏图 ---------- */
.page-about .ab-banner {
  margin: 0 auto;
}

.page-about .ab-banner img {
  display: block;
  width: 100%;
  height: clamp(200px, 34vw, 460px);
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--ink-700);
}

.page-about .ab-banner-cap {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--turf);
  text-align: right;
}

/* ---------- 主栅格 ---------- */
.page-about .ab-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 56px);
  padding-block: clamp(40px, 6vw, 80px) 0;
}

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

/* ---------- 章节 ---------- */
.page-about .ab-sec {
  padding-block: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--ink-800);
}

.page-about .ab-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-sec .display-2 {
  margin-block: 8px 14px;
}

.page-about .ab-sec-lede {
  max-width: 56ch;
  color: var(--turf);
  margin-bottom: 8px;
}

.page-about .ab-sec p {
  max-width: 62ch;
  line-height: 1.75;
}

/* ---------- 内嵌图 ---------- */
.page-about .ab-inline-fig {
  margin: 24px 0 26px;
}

.page-about .ab-inline-fig img {
  display: block;
  width: 100%;
  height: clamp(180px, 26vw, 300px);
  object-fit: cover;
  border-radius: var(--r-md);
  border: 1px solid var(--ink-700);
}

.page-about .ab-inline-fig--tight {
  margin: 0 0 20px;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  position: relative;
  padding-left: 32px;
  margin-top: 8px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--lime-400) 0%, var(--ink-700) 26%, var(--ink-700) 100%);
}

.page-about .ab-node {
  position: relative;
  padding-block: 6px;
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 24px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink-950);
  border: 2px solid var(--ink-700);
}

.page-about .ab-node:nth-child(1)::before {
  border-color: var(--lime-400);
  background: var(--lime-400);
}

.page-about .ab-node-head {
  width: 100%;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  background: none;
  border: 0;
  color: inherit;
  cursor: pointer;
  text-align: left;
  font: inherit;
}

.page-about .ab-node-no {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--lime-400);
  border: 1px solid var(--ink-700);
  border-radius: var(--r-pill);
  padding: 3px 9px;
}

.page-about .ab-node-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.8vw, 28px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .ab-node-icon,
.page-about .ab-role-icon {
  position: relative;
  width: 18px;
  height: 18px;
  flex: none;
}

.page-about .ab-node-icon::before,
.page-about .ab-node-icon::after,
.page-about .ab-role-icon::before,
.page-about .ab-role-icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  background: var(--lime-400);
  border-radius: 2px;
  transition: transform 220ms var(--ease), opacity 220ms var(--ease);
}

.page-about .ab-node-icon::before,
.page-about .ab-role-icon::before {
  width: 14px;
  height: 2px;
}

.page-about .ab-node-icon::after,
.page-about .ab-role-icon::after {
  width: 2px;
  height: 14px;
}

.page-about .ab-node-head[aria-expanded="true"] .ab-node-icon::after,
.page-about .ab-role-head[aria-expanded="true"] .ab-role-icon::after {
  transform: translate(-50%, -50%) scaleY(0);
  opacity: 0;
}

.page-about .ab-node-panel {
  padding-bottom: 12px;
}

.page-about .ab-node-head[aria-expanded="false"] + .ab-node-panel,
.page-about .ab-role-head[aria-expanded="false"] + .ab-role-panel {
  display: none;
}

.page-about .ab-node-inner {
  padding-left: 2px;
  border-left: 2px solid var(--ink-800);
  padding-inline-start: 16px;
}

.page-about .ab-node-inner p {
  color: var(--turf);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .ab-node-inner p + p {
  margin-top: 10px;
}

/* ---------- 服务对象 ---------- */
.page-about .ab-aud-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .ab-aud {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 16px;
  padding-block: 20px;
  border-top: 1px solid var(--ink-800);
}

.page-about .ab-aud:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-about .ab-aud-no {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  font-size: 12px;
  color: var(--ink-950);
  background: var(--lime-400);
  border-radius: var(--r-pill);
}

.page-about .ab-aud-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.35;
  margin: 2px 0 8px;
}

.page-about .ab-aud p {
  color: var(--turf);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 内容维护 ---------- */
.page-about .ab-upkeep {
  display: grid;
  gap: 4px;
  margin-top: 18px;
}

.page-about .ab-upkeep-body p {
  color: var(--turf);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .ab-upkeep-body p + p {
  margin-top: 12px;
}

/* ---------- 双版本 ---------- */
.page-about .ab-ver-grid {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.page-about .ab-ver {
  padding: 20px;
  border-radius: var(--r-md);
  background: var(--ink-900);
  border: 1px solid var(--ink-700);
}

.page-about .ab-ver--cn {
  box-shadow: inset 3px 0 0 0 var(--lime-400);
}

.page-about .ab-ver--cmp {
  box-shadow: inset 3px 0 0 0 var(--orange-500);
}

.page-about .ab-ver-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 21px;
  margin: 12px 0 8px;
}

.page-about .ab-ver p {
  color: var(--turf);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .ab-ver--cmp .pill--orange {
  color: var(--black);
}

/* ---------- 团队角色 ---------- */
.page-about .ab-roles {
  margin-top: 20px;
}

.page-about .ab-role {
  border-top: 1px solid var(--ink-800);
}

.page-about .ab-role-head {
  width: 100%;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 16px 0;
  background: none;
  border: 0;
  color: inherit;
  cursor: pointer;
  text-align: left;
  font: inherit;
}

.page-about .ab-role-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: 0.01em;
}

.page-about .ab-role-panel {
  padding-bottom: 16px;
}

.page-about .ab-role-panel p {
  color: var(--turf);
  font-size: 15px;
  line-height: 1.8;
  padding-left: 2px;
}

/* ---------- 未来路线 ---------- */
.page-about .ab-road {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  counter-reset: road;
}

.page-about .ab-road li {
  position: relative;
  padding: 16px 0 16px 18px;
  border-top: 1px solid var(--ink-800);
}

.page-about .ab-road li:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-about .ab-road li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--orange-500);
}

.page-about .ab-road li:first-child::before {
  top: 12px;
}

.page-about .ab-road-tag {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange-200);
  border: 1px solid var(--ink-700);
  border-radius: var(--r-pill);
  padding: 3px 10px;
  margin-bottom: 8px;
}

.page-about .ab-road p {
  color: var(--turf);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 收尾 CTA ---------- */
.page-about .ab-start {
  margin-top: clamp(28px, 4vw, 44px);
  padding: clamp(24px, 4vw, 40px);
  border-radius: var(--r-lg);
  background: linear-gradient(135deg, var(--ink-800) 0%, var(--ink-900) 62%, var(--ink-950) 100%);
  border: 1px solid var(--ink-700);
}

.page-about .ab-start .display-2 {
  margin-block: 0 12px;
}

.page-about .ab-start p {
  max-width: 58ch;
  color: var(--turf);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .ab-start-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .ab-start-contact {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--ink-700);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--lime-200);
  word-break: break-word;
}

/* ---------- 数据边栏 ---------- */
.page-about .ab-data {
  background: var(--ink-900);
  border: 1px solid var(--ink-700);
  border-radius: var(--r-lg);
  padding: clamp(20px, 3vw, 28px);
  min-width: 0;
}

.page-about .ab-data-title {
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--lime-400);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--ink-700);
}

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

.page-about .ab-data-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-block: 14px;
  border-bottom: 1px dashed var(--ink-700);
}

.page-about .ab-data-label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--turf);
}

.page-about .ab-data-num {
  flex: none;
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 700;
  color: var(--lime-400);
  line-height: 1;
}

.page-about .ab-data-unit {
  font-size: 12px;
  font-weight: 500;
  color: var(--turf);
  margin-left: 3px;
}

.page-about .ab-data-note {
  margin-top: 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--turf);
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .ab-ver-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .ab-upkeep {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .ab-aud {
    grid-template-columns: auto minmax(0, 1fr);
    gap: 6px 22px;
  }
}

@media (min-width: 960px) {
  .page-about .ab-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

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

  .page-about .ab-upkeep {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 24px;
    align-items: start;
  }

  .page-about .ab-inline-fig--tight {
    margin-bottom: 0;
  }

  .page-about .ab-inline-fig--tight img {
    height: clamp(190px, 20vw, 260px);
  }
}

@media (min-width: 1200px) {
  .page-about .ab-hero-inner {
    max-width: 1000px;
  }
}

@media (max-width: 480px) {
  .page-about .ab-timeline {
    padding-left: 26px;
  }

  .page-about .ab-timeline::before {
    left: 6px;
  }

  .page-about .ab-node::before {
    left: -26px;
    width: 12px;
    height: 12px;
  }

  .page-about .ab-node-head {
    gap: 8px;
  }

  .page-about .ab-node-no {
    font-size: 11px;
    padding: 2px 7px;
  }

  .page-about .ab-data-item {
    flex-wrap: wrap;
    gap: 4px;
  }

  .page-about .ab-start-contact {
    font-size: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-node-icon::before,
  .page-about .ab-node-icon::after,
  .page-about .ab-role-icon::before,
  .page-about .ab-role-icon::after {
    transition: none;
  }
}