.page-about {
  --ab-aside-w: 150px;
  --ab-body-on-light: #3E5566;
  --ab-line-light: #DCE4E9;
  display: block;
}

/* ============ 首屏 ============ */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--mist);
  padding: clamp(52px, 8vw, 104px) 0 clamp(46px, 6.5vw, 84px);
}

.page-about .ab-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .3;
}

.page-about .ab-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(158deg, rgba(11, 27, 43, .94) 0%, rgba(11, 27, 43, .74) 46%, rgba(11, 27, 43, .96) 100%);
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero .crumb {
  font-size: 13px;
  color: var(--fog);
}

.page-about .ab-hero .crumb a {
  color: var(--haze);
  text-decoration: none;
  transition: color 220ms var(--ease);
}

.page-about .ab-hero .crumb a:hover {
  color: var(--amber);
}

.page-about .ab-hero .crumb .crumb__sep {
  margin: 0 8px;
  color: var(--ink-3);
}

.page-about .ab-hero .eyebrow {
  margin-top: 26px;
  color: var(--amber);
  letter-spacing: .16em;
}

.page-about .ab-hero__title {
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(28px, 6.8vw, 56px);
  line-height: 1.18;
  letter-spacing: -.01em;
  margin: 16px 0 0;
  max-width: 18ch;
}

.page-about .ab-hero__lede {
  margin-top: 22px;
  max-width: 60ch;
  color: var(--haze);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
}

.page-about .ab-hero__stat {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin: clamp(30px, 4.5vw, 52px) 0 0;
  padding-top: 26px;
  border-top: 1px solid var(--line-dark);
}

.page-about .ab-hero__stat-item dt {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--fog);
  margin-bottom: 8px;
}

.page-about .ab-hero__stat-item dd {
  margin: 0;
  font-size: 17px;
  color: var(--mist);
}

.page-about .ab-hero__stat-item .mono {
  font-family: var(--mono);
  font-size: 24px;
  font-weight: 700;
  color: var(--amber);
  margin-right: 4px;
}

/* ============ 章节骨架 ============ */
.page-about .ab-chapter {
  padding: clamp(58px, 8vw, 96px) 0;
}

.page-about .ab-chapter--light {
  background: var(--mist);
  color: var(--ink);
}

.page-about .ab-chapter--dark {
  background: var(--ink);
  color: var(--mist);
}

.page-about .ab-chapter--deep {
  background: var(--ink-2);
  color: var(--mist);
}

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

.page-about .ab-aside {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .ab-aside__num {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--amber-deep);
}

.page-about .ab-chapter--dark .ab-aside__num,
.page-about .ab-chapter--deep .ab-aside__num {
  color: var(--amber);
}

.page-about .ab-aside__label {
  font-family: var(--serif);
  font-size: 14.5px;
  letter-spacing: .06em;
  color: var(--fog);
}

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

.page-about .ab-title {
  margin: 0 0 20px;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(23px, 4.8vw, 38px);
  line-height: 1.24;
  letter-spacing: -.005em;
  max-width: 22ch;
}

.page-about .ab-text {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ab-body-on-light);
}

.page-about .ab-chapter--dark .ab-text,
.page-about .ab-chapter--deep .ab-text {
  color: var(--haze);
}

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

.page-about .ab-link {
  color: var(--amber-deep);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 220ms var(--ease);
}

.page-about .ab-link:hover {
  color: var(--amber);
}

.page-about .ab-chapter--dark .ab-link {
  color: var(--amber);
}

/* ============ 业务范围 ============ */
.page-about .ab-scope {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .ab-scope__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 26px 0;
  border-top: 1px solid var(--ab-line-light);
}

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

.page-about .ab-scope__idx {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--amber-deep);
}

.page-about .ab-scope__name {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .ab-scope__item .ab-text {
  margin-bottom: 10px;
}

.page-about .ab-scope__fit {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--fog);
  padding-left: 12px;
  border-left: 2px solid var(--haze);
}

/* ============ 发展阶段 / 时间轴 ============ */
.page-about .ab-tl-wrap {
  position: relative;
  margin-top: 34px;
  padding: 34px 22px;
  border: 1px solid var(--line-dark);
  border-radius: var(--r);
  background: rgba(18, 41, 63, .55);
  overflow: hidden;
}

.page-about .ab-tl__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .12;
  pointer-events: none;
}

.page-about .ab-tl {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--amber) 0%, var(--jade) 100%);
  opacity: .72;
}

.page-about .ab-tl__item {
  position: relative;
  padding: 0 0 34px;
}

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

.page-about .ab-tl__dot {
  position: absolute;
  left: -24px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--amber);
  box-sizing: border-box;
}

.page-about .ab-tl__item:last-child .ab-tl__dot {
  border-color: var(--jade);
}

.page-about .ab-tl__years {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--amber);
  margin-bottom: 8px;
}

.page-about .ab-tl__title {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 600;
  color: var(--mist);
}

.page-about .ab-tl__fact {
  margin: 14px 0 0;
  padding-left: 12px;
  border-left: 2px solid rgba(53, 208, 165, .42);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--jade);
}

/* ============ 团队分工 ============ */
.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  margin-top: 32px;
}

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

.page-about .ab-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
}

.page-about .ab-table thead th {
  text-align: left;
  padding: 0 14px 12px 0;
  border-bottom: 2px solid var(--haze);
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .14em;
  color: var(--fog);
}

.page-about .ab-table tbody th,
.page-about .ab-table tbody td {
  text-align: left;
  vertical-align: top;
  padding: 18px 14px 18px 0;
  border-bottom: 1px solid var(--ab-line-light);
  line-height: 1.82;
}

.page-about .ab-table tbody th {
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
}

.page-about .ab-table tbody td {
  color: var(--ab-body-on-light);
}

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

.page-about .ab-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--ab-line-light);
  border-radius: var(--r);
}

.page-about .ab-team__figure figcaption {
  margin-top: 12px;
  font-size: 12.5px;
  line-height: 1.72;
  color: var(--fog);
}

/* ============ 服务覆盖数据块 ============ */
.page-about .ab-data {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 32px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
  border-radius: var(--r);
  overflow: hidden;
}

.page-about .ab-data__cell {
  background: var(--ink-2);
  padding: 24px 20px;
}

.page-about .ab-data__num {
  font-family: var(--mono);
  font-size: clamp(28px, 5.4vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-about .ab-data__unit {
  font-size: 13px;
  color: var(--haze);
  margin-left: 6px;
}

.page-about .ab-data__note {
  margin: 14px 0 0;
  font-size: 12.5px;
  line-height: 1.78;
  color: var(--fog);
}

/* ============ 合作生态 ============ */
.page-about .ab-partners {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .ab-partners__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 22px 0;
  border-top: 1px solid var(--ab-line-light);
}

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

.page-about .ab-partners__tag {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--amber-deep);
}

.page-about .ab-partners__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.86;
  color: var(--ab-body-on-light);
}

.page-about .ab-partners__more {
  margin-top: 24px;
}

/* ============ 所获认可 ============ */
.page-about .ab-honor {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .ab-honor__item {
  position: relative;
  padding: 24px 22px 24px 26px;
  border: 1px solid var(--line-dark);
  border-radius: var(--r);
  background: rgba(18, 41, 63, .6);
}

.page-about .ab-honor__mark {
  position: absolute;
  left: 0;
  top: 22px;
  bottom: 22px;
  width: 3px;
  border-radius: 2px;
}

.page-about .ab-honor__mark--jade {
  background: var(--jade);
}

.page-about .ab-honor__mark--amber {
  background: var(--amber);
}

.page-about .ab-honor__title {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--mist);
}

.page-about .ab-honor__item .ab-text {
  margin-bottom: 0;
}

.page-about .ab-honor__foot {
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line-darker);
  font-size: 14px;
}

/* ============ 下一步 ============ */
.page-about .ab-prepare {
  list-style: none;
  counter-reset: ab-prep;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .ab-prepare li {
  counter-increment: ab-prep;
  position: relative;
  padding: 15px 0 15px 44px;
  border-bottom: 1px solid var(--ab-line-light);
  font-size: 15px;
  line-height: 1.82;
  color: var(--ab-body-on-light);
}

.page-about .ab-prepare li:first-child {
  border-top: 1px solid var(--ab-line-light);
}

.page-about .ab-prepare li::before {
  content: counter(ab-prep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 15px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--amber-deep);
}

.page-about .ab-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.page-about .ab-actions__note {
  margin-top: 20px;
  font-size: 13.5px;
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .ab-scope__item {
    grid-template-columns: 58px minmax(0, 1fr);
    gap: 22px;
    align-items: start;
  }

  .page-about .ab-scope__idx {
    padding-top: 4px;
  }

  .page-about .ab-partners__row {
    grid-template-columns: 82px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
  }

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

  .page-about .ab-hero__stat {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-chapter__grid {
    grid-template-columns: var(--ab-aside-w) minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .ab-aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    position: sticky;
    top: calc(var(--frame-base) + 26px);
    align-self: start;
  }

  .page-about .ab-aside__num {
    display: block;
    width: 100%;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--amber);
  }

  .page-about .ab-chapter--light .ab-aside__num {
    border-bottom-color: var(--amber-deep);
  }

  .page-about .ab-tl-wrap {
    padding: 40px 34px;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-team {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .ab-team__figure {
    position: sticky;
    top: calc(var(--frame-base) + 26px);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-hero .crumb a,
  .page-about .ab-link {
    transition: none;
  }
}