.page-about {
  --ab-index-w: 172px;
  --ab-gap: 22px;
  --ab-line: var(--line-gold);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  background: var(--deep);
  color: var(--paper);
  padding: 22px 0 0;
  overflow: hidden;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--on-dark-soft);
  margin-bottom: 20px;
}
.page-about .breadcrumb a {
  color: var(--gold-soft);
  text-decoration: none;
}
.page-about .breadcrumb a:hover { color: var(--gold); }
.page-about .ab-crumb-sep { color: var(--line-gold); }

.page-about .ab-hero__grid {
  display: grid;
  gap: 26px;
}

.page-about .ab-hero__text .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gold);
  border-left: 3px solid var(--gold);
  padding-left: 10px;
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -.02em;
  font-size: clamp(38px, 9vw, 84px);
  color: var(--paper);
}
.page-about .ab-hero__title em {
  font-style: normal;
  color: var(--gold);
  -webkit-text-stroke: 1px var(--gold-soft);
}

.page-about .ab-hero__lead {
  margin: 18px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--on-dark);
}

.page-about .ab-hero__aside {
  border-top: 2px solid var(--line-paper);
  padding-top: 14px;
}

.page-about .ab-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.page-about .ab-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.page-about .ab-hero__facts .num {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--gold);
  line-height: 1;
}
.page-about .ab-hero__fact-label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--on-dark-soft);
}

.page-about .ab-hero__media {
  margin: 26px 0 0;
  border: var(--bw) solid var(--gold);
  box-shadow: 10px 10px 0 rgba(0, 0, 0, .35);
}
.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-hero__media .media__caption {
  font-size: 12px;
  color: var(--on-dark-soft);
  padding: 8px 10px;
  border-top: 1px solid var(--line-gold);
}

/* ---------- 主体框架：窄索引 + 宽叙事 ---------- */
.page-about .ab-frame {
  padding-top: 30px;
  padding-bottom: 40px;
}

.page-about .ab-rail {
  border: var(--bw) solid var(--deep);
  background: var(--paper-2);
  padding: 14px 14px 12px;
  margin-bottom: 26px;
  box-shadow: var(--shadow-hard);
}
.page-about .ab-rail__kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--mute);
  border-bottom: 1px solid var(--line-deep);
  padding-bottom: 8px;
}
.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
}
.page-about .ab-rail__link {
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 6px 8px;
  font-size: 13px;
  color: var(--ink);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: background .2s var(--ease), border-color .2s var(--ease);
}
.page-about .ab-rail__code {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--gold);
}
.page-about .ab-rail__link:hover {
  background: var(--cyan-wash);
  border-left-color: var(--gold);
}
.page-about .ab-rail__link.is-current {
  background: var(--deep);
  color: var(--paper);
  border-left-color: var(--orange);
}
.page-about .ab-rail__link.is-current .ab-rail__code { color: var(--gold-soft); }
.page-about .ab-rail__note {
  margin: 10px 0 0;
  font-size: 12px;
  color: var(--mute);
  letter-spacing: .08em;
}

/* ---------- 章节通用 ---------- */
.page-about .ab-sec {
  padding: 26px 0 34px;
  border-top: 2px solid var(--line-deep);
}
.page-about .ab-sec--paper { background: var(--paper); }
.page-about .ab-sec--paper2 { background: var(--paper-2); }
.page-about .ab-sec--dark,
.page-about .ab-sec--deep2 {
  background: var(--deep);
  color: var(--paper);
  border-top-color: var(--line-gold);
  padding: 30px 20px 38px;
  margin-left: -20px;
  margin-right: -20px;
}
.page-about .ab-sec--deep2 { background: var(--deep-2); }

.page-about .ab-head {
  border-bottom: var(--bw) solid var(--line-gold);
  padding-bottom: 14px;
  margin-bottom: 24px;
}
.page-about .ab-head .section__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold);
}
.page-about .ab-head .section__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 4.4vw, 38px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: inherit;
}
.page-about .ab-head .section__lead {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mute);
}
.page-about .ab-sec--dark .ab-head .section__lead,
.page-about .ab-sec--deep2 .ab-head .section__lead {
  color: var(--on-dark);
}
.page-about .ab-sec__foot {
  margin: 22px 0 0;
  padding: 14px 16px;
  background: var(--cyan-wash);
  border-left: 4px solid var(--cyan);
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 01 定位 ---------- */
.page-about .ab-pillars {
  display: grid;
  gap: 16px;
}
.page-about .ab-pillar {
  border: var(--bw) solid var(--deep);
  background: var(--paper-2);
  padding: 16px 16px 14px;
  box-shadow: var(--shadow-hard);
}
.page-about .ab-pillar__code {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--deep);
  background: var(--gold-soft);
  border: 2px solid var(--deep);
  padding: 1px 8px;
}
.page-about .ab-pillar__title {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.4;
  color: var(--deep);
}
.page-about .ab-pillar p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink);
}
.page-about .ab-pillar__link {
  display: inline-block;
  margin-top: 12px;
  font-size: 13px;
  color: var(--deep-2);
  text-decoration: none;
  border-bottom: 2px solid var(--gold);
  padding-bottom: 2px;
}
.page-about .ab-pillar__link:hover { color: var(--orange); border-bottom-color: var(--orange); }

/* ---------- 02 时间线 ---------- */
.page-about .ab-tl-wrap {
  display: grid;
  gap: 28px;
}
.page-about .ab-tl {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(231, 206, 143, .18) 100%);
}
.page-about .ab-tl__item {
  position: relative;
  padding: 0 0 26px 30px;
}
.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gold);
  border: 2px solid var(--deep);
  box-shadow: 0 0 0 3px rgba(201, 162, 75, .18);
}
.page-about .ab-tl__item:last-child { padding-bottom: 0; }
.page-about .ab-tl__code {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--gold-soft);
  letter-spacing: .1em;
}
.page-about .ab-tl__title {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.4;
  color: var(--paper);
}
.page-about .ab-tl__item p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--on-dark);
}
.page-about .ab-tl__media {
  margin: 0;
  border: var(--bw) solid var(--line-gold);
  box-shadow: var(--shadow-dark);
}
.page-about .ab-tl__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-tl__media .media__caption {
  font-size: 12px;
  color: var(--on-dark-soft);
  padding: 8px 10px;
  border-top: 1px solid var(--line-gold);
}

/* ---------- 03 分类 ---------- */
.page-about .ab-matrix {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.page-about .ab-cat {
  border: var(--bw) solid var(--deep);
  background: var(--paper);
  padding: 14px;
  transition: transform .22s var(--ease), box-shadow .22s var(--ease);
}
.page-about .ab-cat__code {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--gold);
}
.page-about .ab-cat__title {
  margin: 6px 0 10px;
  font-family: var(--font-display);
  font-size: 17px;
  color: var(--deep);
}
.page-about .ab-cat__meter {
  margin: 0 0 10px;
  height: 6px;
  background: rgba(11, 31, 58, .1);
  overflow: hidden;
}
.page-about .ab-cat__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--gold));
}
.page-about .ab-cat:nth-child(1) .ab-cat__fill { width: 92%; }
.page-about .ab-cat:nth-child(2) .ab-cat__fill { width: 88%; }
.page-about .ab-cat:nth-child(3) .ab-cat__fill { width: 84%; }
.page-about .ab-cat:nth-child(4) .ab-cat__fill { width: 79%; }
.page-about .ab-cat:nth-child(5) .ab-cat__fill { width: 74%; }
.page-about .ab-cat:nth-child(6) .ab-cat__fill { width: 70%; }
.page-about .ab-cat:nth-child(7) .ab-cat__fill { width: 66%; }
.page-about .ab-cat:nth-child(8) .ab-cat__fill { width: 61%; }
.page-about .ab-cat:nth-child(9) .ab-cat__fill { width: 57%; }

.page-about .ab-cat__tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.page-about .ab-cat__tags li {
  font-size: 12px;
  line-height: 1.6;
  padding: 2px 7px;
  background: var(--cyan-wash);
  color: var(--deep-2);
  border: 1px solid rgba(95, 184, 196, .5);
}
.page-about .ab-cat:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-lift);
}
.page-about .ab-cat:hover .ab-cat__tags li {
  background: var(--gold-soft);
  border-color: var(--gold);
  color: var(--deep);
}

.page-about .ab-matrix__foot {
  margin-top: 24px;
  display: grid;
  gap: 18px;
  border-top: 2px solid var(--line-deep);
  padding-top: 20px;
}
.page-about .ab-matrix__text h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  color: var(--deep);
}
.page-about .ab-matrix__text p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink);
}
.page-about .ab-matrix__media {
  margin: 0;
  border: var(--bw) solid var(--deep);
  box-shadow: var(--shadow-hard);
}
.page-about .ab-matrix__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 04 服务 ---------- */
.page-about .ab-svc {
  display: grid;
  gap: 14px;
}
.page-about .ab-svc__card {
  border: var(--bw) solid var(--line-gold);
  background: rgba(8, 23, 41, .55);
  padding: 16px;
  border-top: 4px solid var(--gold);
}
.page-about .ab-svc__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--gold);
  line-height: 1;
}
.page-about .ab-svc__title {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-size: 17px;
  line-height: 1.4;
  color: var(--paper);
}
.page-about .ab-svc__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--on-dark);
}
.page-about .ab-svc__band {
  margin-top: 22px;
  border: 2px solid var(--cyan);
  background: rgba(95, 184, 196, .12);
  padding: 16px;
  display: grid;
  gap: 14px;
  align-items: center;
}
.page-about .ab-svc__band-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper);
}
.page-about .ab-svc__band .btn { justify-self: start; }

/* ---------- 05 原则 ---------- */
.page-about .ab-prin {
  display: grid;
  gap: 20px;
}
.page-about .ab-prin__card {
  border: var(--bw) solid var(--deep);
  background: var(--paper-2);
  padding: 18px 16px;
  box-shadow: var(--shadow-hard);
  position: relative;
}
.page-about .ab-prin__tag {
  position: absolute;
  top: -2px;
  right: -2px;
  background: var(--deep);
  color: var(--gold-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 3px 9px;
}
.page-about .ab-prin__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 24px;
  letter-spacing: .04em;
  color: var(--deep);
}
.page-about .ab-prin__card p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink);
}
.page-about .ab-prin__do {
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line-deep);
  font-size: 13px;
  line-height: 1.7;
  color: var(--deep-2);
}

/* ---------- 06 资质 ---------- */
.page-about .ab-facts {
  margin: 0;
  border-top: 2px solid var(--deep);
}
.page-about .ab-facts__row {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-deep);
}
.page-about .ab-facts__row dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gold);
}
.page-about .ab-facts__row dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink);
  word-break: break-word;
}

.page-about .ab-cta {
  margin-top: 26px;
  background: var(--deep);
  color: var(--paper);
  border: var(--bw) solid var(--gold);
  box-shadow: var(--shadow-lift);
  padding: 20px 16px;
  display: grid;
  gap: 16px;
}
.page-about .ab-cta__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  line-height: 1.4;
  color: var(--paper);
}
.page-about .ab-cta__text p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--on-dark);
}
.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 移动端溢出保护 ---------- */
.page-about .ab-frame,
.page-about .ab-flow,
.page-about .ab-sec {
  max-width: 100%;
  overflow-wrap: break-word;
}

/* ---------- 中等屏 ---------- */
@media (min-width: 640px) {
  .page-about .ab-rail__list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .ab-pillars { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .ab-matrix { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .ab-svc { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .ab-facts__row { grid-template-columns: 150px minmax(0, 1fr); gap: 14px; }
  .page-about .ab-facts__row dt { padding-top: 3px; }
  .page-about .ab-svc__band { grid-template-columns: minmax(0, 1fr) auto; }
  .page-about .ab-svc__band .btn { justify-self: end; }
  .page-about .ab-matrix__foot { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: center; }
  .page-about .ab-cta { padding: 24px 22px; }
}

/* ---------- 桌面：左窄索引 + 右宽叙事 ---------- */
@media (min-width: 1000px) {
  .page-about .ab-hero { padding-top: 30px; }
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 42px;
    align-items: end;
  }
  .page-about .ab-hero__aside { padding-top: 22px; }
  .page-about .ab-hero__facts { grid-template-columns: 1fr; gap: 16px; }
  .page-about .ab-hero__facts li {
    flex-direction: row;
    align-items: baseline;
    gap: 12px;
    border-left: 3px solid var(--line-gold);
    padding-left: 12px;
  }
  .page-about .ab-hero__facts .num { min-width: 62px; }

  .page-about .ab-frame {
    display: grid;
    grid-template-columns: var(--ab-index-w) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
    padding-top: 40px;
  }
  .page-about .ab-rail {
    position: sticky;
    top: 74px;
    margin-bottom: 0;
  }
  .page-about .ab-rail__list { grid-template-columns: 1fr; gap: 4px; }
  .page-about .ab-flow { min-width: 0; }

  .page-about .ab-sec { padding: 34px 0 46px; }
  .page-about .ab-sec--dark,
  .page-about .ab-sec--deep2 {
    padding: 38px 34px 46px;
    margin-left: -34px;
    margin-right: -34px;
  }

  .page-about .ab-pillars { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
  .page-about .ab-pillar { padding: 20px 18px 16px; }

  .page-about .ab-tl-wrap {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 42px;
    align-items: start;
  }
  .page-about .ab-tl__media { position: sticky; top: 90px; }
  .page-about .ab-tl__item { padding-left: 36px; padding-bottom: 32px; }

  .page-about .ab-matrix { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }

  .page-about .ab-svc { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }

  .page-about .ab-prin {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
    padding-bottom: 44px;
  }
  .page-about .ab-prin__card:nth-child(2) { transform: translateY(22px); }
  .page-about .ab-prin__card:nth-child(3) { transform: translateY(44px); }

  .page-about .ab-facts__row { grid-template-columns: 180px minmax(0, 1fr); padding: 16px 0; }
  .page-about .ab-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 28px 26px;
    gap: 24px;
  }
  .page-about .ab-cta__actions { justify-content: flex-end; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-cat,
  .page-about .ab-rail__link {
    transition: none;
  }
  .page-about .ab-prin__card:nth-child(2),
  .page-about .ab-prin__card:nth-child(3) {
    transform: none;
  }
}
</style>
<<<END>>>