.page-about {
  --ab-line: rgba(22, 37, 90, 0.18);
  --ab-soft: rgba(22, 37, 90, 0.78);
  background: var(--c-paper);
  color: var(--c-indigo);
  overflow-x: clip;
}

/* ============ 首屏 ============ */
.page-about .ab-hero {
  position: relative;
  padding: 40px 0 56px;
  background:
    radial-gradient(circle at 84% 10%, rgba(240, 180, 41, 0.26), transparent 52%),
    radial-gradient(circle at 6% 88%, rgba(43, 217, 207, 0.2), transparent 48%),
    linear-gradient(158deg, var(--c-indigo) 0%, var(--c-indigo-deep) 70%);
  color: var(--c-white);
  overflow: hidden;
}

.page-about .ab-hero__inner {
  display: grid;
  gap: 34px;
  align-items: center;
}

.page-about .ab-hero__crumbs {
  margin: 0 0 24px;
  font-size: var(--t-12);
  letter-spacing: 0.14em;
}

.page-about .ab-hero__crumbs a,
.page-about .ab-hero__crumbs li {
  color: rgba(255, 255, 255, 0.72);
}

.page-about .ab-hero__crumbs a:hover {
  color: var(--c-gold-hi);
}

.page-about .ab-hero__crumbs [aria-current="page"] {
  color: var(--c-gold);
}

.page-about .ab-hero__eyebrow {
  margin: 0 0 16px;
  font-size: var(--t-12);
  letter-spacing: 0.3em;
  color: var(--c-gold);
}

.page-about .ab-hero h1 {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 58px);
  line-height: 1.14;
  letter-spacing: -0.02em;
}

.page-about .ab-hero h1::after {
  content: "";
  display: block;
  width: 88px;
  height: 6px;
  margin-top: 20px;
  background: var(--c-gold);
}

.page-about .ab-hero__lead {
  margin: 0 0 30px;
  max-width: 36em;
  font-size: var(--t-17);
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.88);
}

.page-about .ab-hero__facts {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(158px, 1fr));
}

.page-about .ab-hero__visual {
  position: relative;
  margin: 0;
  border: 2px solid var(--c-gold);
  box-shadow: 6px 6px 0 rgba(240, 180, 41, 0.45);
  overflow: hidden;
  background: var(--c-indigo-deep);
}

.page-about .ab-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .ab-hero__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(150deg, rgba(11, 18, 48, 0.62) 0%, rgba(22, 37, 90, 0.22) 46%, rgba(240, 180, 41, 0.2) 100%);
  pointer-events: none;
}

.page-about .ab-hero__caption {
  position: absolute;
  z-index: 2;
  left: 0;
  bottom: 0;
  padding: 9px 16px;
  background: var(--c-indigo-deep);
  color: var(--c-gold-hi);
  font-family: var(--font-mono);
  font-size: var(--t-12);
  letter-spacing: 0.16em;
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding: 72px 0 96px;
  }

  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    gap: 52px;
  }
}

/* ============ 主体骨架 ============ */
.page-about .ab-body {
  display: grid;
  gap: 30px;
  margin-top: 44px;
  margin-bottom: 56px;
}

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

.page-about .ab-rail__mark {
  display: none;
}

.page-about .ab-rail__label {
  margin: 0 0 4px;
  font-size: var(--t-12);
  letter-spacing: 0.3em;
  color: var(--c-slate);
}

.page-about .ab-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-toc__link {
  display: block;
  padding: 8px 0;
  font-size: var(--t-14);
  color: var(--ab-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--ab-line);
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .ab-toc__link:hover,
.page-about .ab-toc__link:focus-visible {
  color: var(--c-indigo-deep);
  border-bottom-color: var(--c-gold);
}

.page-about .ab-toc__link[aria-current="true"] {
  color: var(--c-indigo-deep);
  font-weight: 700;
  border-bottom: 3px solid var(--c-gold);
}

@media (min-width: 1000px) {
  .page-about .ab-body {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 62px;
    margin-top: 88px;
    margin-bottom: 96px;
  }

  .page-about .ab-rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .ab-rail__mark {
    display: block;
    position: absolute;
    left: -32px;
    top: 0;
    margin: 0;
    writing-mode: vertical-rl;
    font-size: var(--t-12);
    letter-spacing: 0.34em;
    color: var(--c-slate);
  }

  .page-about .ab-toc {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    margin-top: 14px;
  }
}

/* ============ 章节通用 ============ */
.page-about .ab-chapter {
  scroll-margin-top: 108px;
  margin-bottom: 56px;
}

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

@media (min-width: 1000px) {
  .page-about .ab-chapter {
    margin-bottom: 96px;
  }
}

.page-about .ab-head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 14px;
  margin-bottom: 26px;
  border-top: 2px solid var(--c-indigo);
}

.page-about .ab-head__num {
  flex: none;
  padding: 3px 8px;
  background: var(--c-gold);
  color: var(--c-indigo-deep);
  font-size: var(--t-14);
  font-weight: 700;
  letter-spacing: 0.1em;
  box-shadow: 3px 3px 0 rgba(11, 18, 48, 0.85);
}

.page-about .ab-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 4.6vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .ab-text p {
  margin: 0 0 1em;
  font-size: var(--t-17);
  line-height: 1.85;
  color: var(--ab-soft);
}

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

.page-about .ab-text-lead {
  margin: 0 0 22px;
  font-size: var(--t-17);
  line-height: 1.8;
  color: var(--ab-soft);
}

/* ============ 01 三条主线 ============ */
.page-about .ab-lanes {
  display: grid;
  gap: 16px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-lane {
  padding: 20px 18px 22px;
  background: var(--c-white);
  border: 2px solid var(--c-indigo);
  box-shadow: var(--shadow-2);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.page-about .ab-lane:hover {
  transform: translateY(-2px);
  border-color: var(--c-gold);
  box-shadow: var(--shadow-gold);
}

.page-about .ab-lane h3 {
  margin: 14px 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--t-22);
  line-height: 1.3;
}

.page-about .ab-lane p {
  margin: 0;
  font-size: var(--t-14);
  line-height: 1.8;
  color: var(--ab-soft);
}

@media (min-width: 780px) {
  .page-about .ab-lanes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

/* ============ 02 里程碑色带 ============ */
.page-about .ab-timeline {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(238px, 78%);
  gap: 16px;
  margin: 0 -4px;
  padding: 4px 4px 20px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-milestone {
  position: relative;
  scroll-snap-align: start;
  padding: 28px 18px 22px;
  background: var(--c-white);
  border: 2px solid var(--c-indigo);
  box-shadow: var(--shadow-2);
}

.page-about .ab-milestone::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 8px;
  background: var(--c-gold);
}

.page-about .ab-milestone:nth-child(2)::before {
  background: var(--c-cyan);
}

.page-about .ab-milestone:nth-child(3)::before {
  background: var(--c-orange);
}

.page-about .ab-milestone:nth-child(4)::before {
  background: var(--c-green);
}

.page-about .ab-milestone:nth-child(5)::before {
  background: var(--c-gold-hi);
}

.page-about .ab-milestone__ver {
  display: inline-block;
  padding: 3px 8px;
  background: var(--c-indigo);
  color: var(--c-gold-hi);
  font-size: var(--t-12);
  letter-spacing: 0.14em;
}

.page-about .ab-milestone h3 {
  margin: 14px 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--t-22);
  line-height: 1.3;
}

.page-about .ab-milestone p {
  margin: 0;
  font-size: var(--t-14);
  line-height: 1.8;
  color: var(--ab-soft);
}

@media (min-width: 780px) {
  .page-about .ab-timeline {
    grid-auto-columns: minmax(260px, 32%);
    gap: 18px;
  }
}

/* ============ 03 数据链路 ============ */
.page-about .ab-data-grid {
  display: grid;
  gap: 26px;
}

.page-about .ab-data__figure {
  position: relative;
  margin: 0;
  border: 2px solid var(--c-indigo);
  box-shadow: var(--shadow-1);
  background: var(--c-white);
  overflow: hidden;
}

.page-about .ab-data__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .ab-data__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 8px 14px;
  background: var(--c-indigo);
  color: var(--c-gold-hi);
  font-size: var(--t-12);
  letter-spacing: 0.16em;
}

.page-about .ab-data__body p {
  margin: 0 0 4px;
  font-size: var(--t-17);
  line-height: 1.85;
  color: var(--ab-soft);
}

.page-about .ab-steps {
  margin: 22px 0 0;
  padding: 0 0 0 24px;
  list-style: none;
  border-left: 2px solid var(--ab-line);
}

.page-about .ab-step {
  position: relative;
  padding-bottom: 22px;
}

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

.page-about .ab-step::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 5px;
  width: 10px;
  height: 10px;
  background: var(--c-gold);
  border: 2px solid var(--c-indigo);
}

.page-about .ab-step__n {
  display: block;
  font-size: var(--t-12);
  letter-spacing: 0.2em;
  color: var(--c-orange);
}

.page-about .ab-step h3 {
  margin: 6px 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--t-22);
}

.page-about .ab-step p {
  margin: 0;
  font-size: var(--t-14);
  line-height: 1.8;
  color: var(--ab-soft);
}

@media (min-width: 880px) {
  .page-about .ab-data-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 36px;
    align-items: start;
  }
}

/* ============ 04 团队分工 ============ */
.page-about .ab-teams {
  display: grid;
  gap: 18px;
  margin-top: 24px;
}

.page-about .ab-team {
  position: relative;
  padding: 22px 18px 26px;
  background: var(--c-white);
  border: 2px solid var(--c-indigo);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), 0 100%);
}

.page-about .ab-team:focus-visible {
  outline: 3px solid var(--c-gold);
  outline-offset: 3px;
}

.page-about .ab-team__band {
  display: block;
  height: 6px;
  margin: 0 0 18px;
  background: var(--c-gold);
}

.page-about .ab-team--tech .ab-team__band {
  background: var(--c-cyan);
}

.page-about .ab-team--care .ab-team__band {
  background: var(--c-orange);
}

.page-about .ab-team__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--t-22);
}

.page-about .ab-team__sum {
  margin: 0 0 12px;
  font-size: var(--t-14);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-indigo-deep);
}

.page-about .ab-team__detail {
  margin: 0;
  font-size: var(--t-14);
  line-height: 1.8;
  color: var(--ab-soft);
}

@media (hover: hover) and (min-width: 880px) {
  .page-about .ab-team__detail {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, opacity 0.3s ease;
  }

  .page-about .ab-team:hover .ab-team__detail,
  .page-about .ab-team:focus .ab-team__detail,
  .page-about .ab-team:focus-within .ab-team__detail {
    max-height: 340px;
    opacity: 1;
  }
}

@media (min-width: 880px) {
  .page-about .ab-teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

/* ============ 05 服务区域 ============ */
.page-about .ab-region__figure {
  position: relative;
  margin: 0 0 26px;
  border: 2px solid var(--c-indigo);
  overflow: hidden;
  background: var(--c-paper);
}

.page-about .ab-region__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  opacity: 0.92;
}

.page-about .ab-region__cap {
  position: absolute;
  right: 0;
  bottom: 0;
  padding: 8px 14px;
  background: var(--c-indigo-deep);
  color: var(--c-gold-hi);
  font-family: var(--font-mono);
  font-size: var(--t-12);
  letter-spacing: 0.14em;
}

.page-about .ab-metrics {
  display: grid;
  gap: 2px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  background: var(--ab-line);
  border: 2px solid var(--c-indigo);
}

.page-about .ab-metric {
  padding: 20px 18px;
  background: var(--c-white);
}

.page-about .ab-metric__value {
  display: block;
  font-size: var(--t-44);
  font-weight: 700;
  line-height: 1;
  color: var(--c-indigo);
  letter-spacing: -0.02em;
}

.page-about .ab-metric__unit {
  display: block;
  margin-top: 8px;
  font-size: var(--t-12);
  letter-spacing: 0.24em;
  color: var(--c-orange);
}

.page-about .ab-metric__desc {
  display: block;
  margin-top: 8px;
  font-size: var(--t-14);
  line-height: 1.7;
  color: var(--ab-soft);
}

@media (min-width: 720px) {
  .page-about .ab-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ============ 06 资质与备案 ============ */
.page-about .ab-credential {
  display: grid;
  gap: 24px;
  padding: 24px 20px;
  background: var(--c-white);
  border: 2px solid var(--c-indigo);
  box-shadow: var(--shadow-2);
}

.page-about .ab-credential__list {
  display: grid;
  gap: 16px;
  margin: 0;
}

.page-about .ab-credential__list dt {
  margin-bottom: 4px;
  font-size: var(--t-12);
  letter-spacing: 0.2em;
  color: var(--c-slate);
}

.page-about .ab-credential__list dd {
  margin: 0;
  font-size: var(--t-17);
  color: var(--c-indigo);
  overflow-wrap: anywhere;
}

.page-about .ab-credential__note {
  margin: 0 0 16px;
  font-size: var(--t-14);
  line-height: 1.8;
  color: var(--ab-soft);
  padding-left: 14px;
  border-left: 4px solid var(--c-cyan);
}

@media (min-width: 560px) {
  .page-about .ab-credential__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 26px;
  }
}

@media (min-width: 880px) {
  .page-about .ab-credential {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: 34px;
    padding: 30px 28px;
  }
}

/* ============ 07 长期做法 ============ */
.page-about .ab-principles {
  display: grid;
  gap: 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-principle {
  padding-top: 16px;
  border-top: 3px solid var(--c-indigo);
}

.page-about .ab-principle__n {
  display: inline-block;
  padding: 2px 9px;
  background: var(--c-indigo-deep);
  color: var(--c-gold);
  font-size: var(--t-12);
  letter-spacing: 0.16em;
}

.page-about .ab-principle h3 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--t-22);
}

.page-about .ab-principle p {
  margin: 0;
  font-size: var(--t-14);
  line-height: 1.8;
  color: var(--ab-soft);
}

@media (min-width: 780px) {
  .page-about .ab-principles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px 34px;
  }
}

/* ============ 结尾行动区 ============ */
.page-about .ab-cta {
  padding: 44px 0;
  background: linear-gradient(118deg, var(--c-indigo-deep) 0%, var(--c-indigo) 58%, #1d3070 100%);
  color: var(--c-white);
}

.page-about .ab-cta__inner {
  display: grid;
  gap: 24px;
}

.page-about .ab-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 4.4vw, 32px);
  line-height: 1.25;
}

.page-about .ab-cta__text p {
  margin: 0;
  max-width: 42em;
  font-size: var(--t-17);
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.85);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.page-about .ab-cta__actions .link-arrow {
  color: var(--c-gold-hi);
}

@media (min-width: 880px) {
  .page-about .ab-cta {
    padding: 64px 0;
  }

  .page-about .ab-cta__inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: center;
    gap: 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-lane,
  .page-about .ab-toc__link,
  .page-about .ab-team__detail {
    transition: none;
  }
}