.page-about {
  --ab-r: 3px;
  display: block;
  padding-bottom: 72px;
}

/* 面包屑 */
.page-about .ab-crumb {
  padding-top: 26px;
}

/* 首屏 */
.page-about .ab-hero {
  padding-top: 2px;
}

.page-about .ab-hero__copy {
  max-width: 70ch;
}

.page-about .ab-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(27px, 5.6vw, 46px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 12px 0 16px;
  max-width: 22ch;
}

.page-about .ab-hero__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .ab-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
}

.page-about .ab-hero__chips .chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.page-about .ab-hero__band {
  margin-top: 26px;
}

.page-about .ab-hero__band .media-frame {
  border-radius: var(--ab-r);
}

.page-about .ab-hero__band img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* 锚点索引 */
.page-about .ab-index {
  margin-top: 34px;
  border-block: 1px solid var(--line);
  background: var(--panel-deep);
}

.page-about .ab-index ul {
  display: flex;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 9px 16px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

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

.page-about .ab-index a {
  display: block;
  white-space: nowrap;
  padding: 6px 11px;
  border: 1px solid transparent;
  border-radius: var(--ab-r);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.page-about .ab-index a:hover,
.page-about .ab-index a:focus-visible {
  color: var(--lime);
  border-color: var(--line);
  background: var(--panel);
}

/* 通用段落 */
.page-about .ab-sec {
  padding-block: 46px;
  border-top: 1px solid var(--line);
}

.page-about .ab-sec:first-of-type {
  border-top: 0;
}

.page-about .ab-sec h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(21px, 3.2vw, 30px);
  line-height: 1.24;
  letter-spacing: -0.015em;
  color: var(--paper);
  margin: 0 0 14px;
  max-width: 24ch;
}

.page-about .ab-sec__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* 业务范围 */
.page-about .ab-scope {
  display: grid;
  gap: 20px;
  margin-top: 24px;
}

.page-about .ab-scope__text p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--paper);
  max-width: 62ch;
}

.page-about .ab-scope__text p:last-child {
  margin-bottom: 0;
  color: var(--muted);
}

.page-about .ab-scope__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--ab-r);
  background: var(--line);
  overflow: hidden;
}

.page-about .ab-scope__list li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  padding: 14px 16px;
  background: var(--panel-deep);
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .ab-scope__list .mono {
  color: var(--lime);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding-top: 3px;
}

/* 覆盖范围数据卡 */
.page-about .ab-cov {
  display: grid;
  gap: var(--gap);
  margin-top: 24px;
}

.page-about .ab-card {
  position: relative;
  padding: 18px 18px 16px;
  border: 1px solid var(--line);
  border-radius: var(--ab-r);
  background: var(--panel);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.page-about .ab-card:hover {
  border-color: #2F5B4C;
  background: var(--panel-deep);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.28);
}

.page-about .ab-card__num {
  margin: 0;
  font-size: clamp(36px, 6vw, 52px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--lime);
}

.page-about .ab-card__title {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 16px;
  line-height: 1.4;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .ab-card__body {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .ab-card--lead {
  border-color: #2F5B4C;
  background: linear-gradient(160deg, rgba(200, 255, 61, 0.07), transparent 62%), var(--panel);
}

/* 数据来源 */
.page-about .ab-src {
  display: grid;
  gap: 20px;
  margin-top: 22px;
}

.page-about .ab-src__intro p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--paper);
  max-width: 62ch;
}

.page-about .ab-src__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--ab-r);
  background: var(--line);
  overflow: hidden;
}

.page-about .ab-src__list li {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 14px;
  padding: 16px;
  background: var(--panel-deep);
}

.page-about .ab-src__k {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--lime);
  padding-top: 2px;
}

.page-about .ab-src__list h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 15px;
  color: var(--paper);
}

.page-about .ab-src__list p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* 团队 */
.page-about .ab-team {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.page-about .ab-team__cards {
  display: grid;
  gap: var(--gap);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .ab-team__card {
  padding: 0;
  overflow: hidden;
}

.page-about .ab-team__card summary {
  list-style: none;
  cursor: pointer;
  padding: 16px 16px 14px;
  display: block;
}

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

.page-about .ab-team__head {
  display: block;
}

.page-about .ab-team__num {
  display: block;
  font-size: 34px;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--lime);
}

.page-about .ab-team__role {
  display: block;
  margin-top: 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 15px;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .ab-team__role::after {
  content: "＋";
  float: right;
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 13px;
  color: var(--muted);
}

.page-about .ab-team__card[open] .ab-team__role::after {
  content: "−";
  color: var(--lime);
}

.page-about .ab-team__card[open] {
  border-color: #2F5B4C;
}

.page-about .ab-team__body {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 13.5px;
  line-height: 1.74;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

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

.page-about .ab-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* 时间线 */
.page-about .ab-tl {
  position: relative;
  margin-top: 26px;
  padding-left: 22px;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime), rgba(200, 255, 61, 0.1));
}

.page-about .ab-tl__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
  opacity: 0.13;
  border-radius: var(--ab-r);
}

.page-about .ab-tl__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .ab-tl__list {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

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

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 17px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--lime);
}

.page-about .ab-tl__node {
  border: 1px solid var(--line);
  border-radius: var(--ab-r);
  background: var(--panel-deep);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .ab-tl__node:hover {
  border-color: #2F5B4C;
}

.page-about .ab-tl__node[open] {
  border-color: var(--lime);
  background: var(--panel);
}

.page-about .ab-tl__node summary {
  position: relative;
  list-style: none;
  cursor: pointer;
  padding: 14px 40px 14px 16px;
  display: grid;
  gap: 6px;
}

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

.page-about .ab-tl__node summary::after {
  content: "＋";
  position: absolute;
  right: 14px;
  top: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
}

.page-about .ab-tl__node[open] summary::after {
  content: "−";
  color: var(--lime);
}

.page-about .ab-tl__ver {
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--lime);
}

.page-about .ab-tl__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 16px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .ab-tl__body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.page-about .ab-tl__body p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.76;
  color: var(--muted);
  max-width: 62ch;
}

/* 合作与内容规模 */
.page-about .ab-scale {
  display: grid;
  gap: var(--gap);
  margin-top: 22px;
}

.page-about .ab-scale__panel {
  padding: 18px;
  border-radius: var(--ab-r);
}

.page-about .ab-scale__num {
  margin: 0;
  font-size: clamp(30px, 5vw, 40px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--lime);
}

.page-about .ab-scale__panel h3 {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 15px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .ab-scale__panel p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.74;
  color: var(--muted);
}

/* 服务中心 */
.page-about .ab-service {
  display: grid;
  gap: 18px;
  margin-top: 22px;
}

.page-about .ab-service__info {
  border: 1px solid var(--line);
  border-radius: var(--ab-r);
  background: var(--panel-deep);
  padding: 18px;
}

.page-about .ab-service__dl {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-service__dl > div {
  display: grid;
  gap: 4px;
}

.page-about .ab-service__dl dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .ab-service__dl dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .ab-service__dl dd a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .ab-service__dl dd a:hover,
.page-about .ab-service__dl dd a:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
}

.page-about .ab-service__note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .ab-service__next {
  border: 1px solid var(--line);
  border-radius: var(--ab-r);
  background: var(--panel);
  padding: 18px;
}

.page-about .ab-service__next h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  color: var(--paper);
}

.page-about .ab-service__next p {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.76;
  color: var(--muted);
}

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

/* 断点 */
@media (min-width: 700px) {
  .page-about .ab-sec {
    padding-block: 54px;
  }

  .page-about .ab-scope {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 26px;
  }

  .page-about .ab-cov {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    padding-top: 14px;
  }

  .page-about .ab-cov > .ab-card:nth-child(1) {
    grid-column: span 7;
    transform: translateY(-12px);
    z-index: 2;
  }

  .page-about .ab-cov > .ab-card:nth-child(2) {
    grid-column: span 5;
  }

  .page-about .ab-cov > .ab-card:nth-child(3) {
    grid-column: span 5;
  }

  .page-about .ab-cov > .ab-card:nth-child(4) {
    grid-column: span 7;
  }

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

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

  .page-about .ab-service {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 20px;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-team {
    grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
    align-items: start;
    gap: 20px;
  }

  .page-about .ab-src {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 26px;
    align-items: start;
  }

  .page-about .ab-tl {
    padding-left: 26px;
  }

  .page-about .ab-tl__item::before {
    left: -26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-card,
  .page-about .ab-tl__node,
  .page-about .ab-index a,
  .page-about .ab-service__dl dd a {
    transition: none;
  }

  .page-about .ab-cov > .ab-card:nth-child(1) {
    transform: none;
  }
}