.page-about .ab-h2 {
  font-family: var(--font-display);
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--mist);
  margin: 0 0 14px;
}

.page-about .ab-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  padding-bottom: 1px;
}
.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  border-bottom-color: var(--cyan);
}

/* 首屏 */
.page-about .ab-hero {
  padding-block: clamp(20px, 4vw, 40px) clamp(36px, 6vw, 72px);
  position: relative;
}
.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
}
.page-about .ab-hero__title {
  margin: 10px 0 18px;
  font-size: clamp(30px, 6.2vw, 60px);
  line-height: 1.08;
}
.page-about .ab-hero__lede {
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: var(--body-ink);
  max-width: 46ch;
  margin: 0 0 26px;
}
.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-viz {
  position: relative;
  height: clamp(180px, 34vw, 240px);
  border: 1px solid var(--line-soft);
  background:
    radial-gradient(120% 90% at 12% 8%, rgba(45, 226, 230, 0.16), transparent 62%),
    radial-gradient(100% 80% at 92% 92%, rgba(217, 164, 65, 0.14), transparent 60%),
    var(--ink-800);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
  overflow: hidden;
  margin-bottom: 18px;
}
.page-about .ab-viz__label {
  position: absolute;
  top: 14px;
  left: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--grey);
}
.page-about .ab-viz__stack {
  position: absolute;
  inset: 46px 18px 24px 18px;
}
.page-about .ab-viz__card {
  position: absolute;
  display: block;
  height: 62%;
  border: 1px solid var(--line-cyan);
  background: linear-gradient(150deg, rgba(16, 38, 58, 0.95), rgba(11, 27, 43, 0.6));
}
.page-about .ab-viz__card--1 {
  left: 0;
  top: 16%;
  width: 42%;
  border-color: rgba(217, 164, 65, 0.5);
}
.page-about .ab-viz__card--2 {
  left: 26%;
  top: 6%;
  width: 44%;
}
.page-about .ab-viz__card--3 {
  right: 0;
  top: 22%;
  width: 36%;
  border-color: rgba(255, 107, 87, 0.42);
}
.page-about .ab-viz__scan {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  opacity: 0.7;
  animation: ab-scan 6s linear infinite;
}
.page-about .ab-viz__rail {
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 12px;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), var(--cyan) 42%, rgba(45, 226, 230, 0.1));
}
@keyframes ab-scan {
  0% { transform: translateY(0); opacity: 0; }
  12% { opacity: 0.75; }
  88% { opacity: 0.75; }
  100% { transform: translateY(210px); opacity: 0; }
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}
.page-about .ab-stats__item {
  background: var(--ink-900);
  padding: 12px 14px;
}
.page-about .ab-stats dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--grey);
  margin-bottom: 4px;
}
.page-about .ab-stats dd {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(20px, 3.6vw, 26px);
  color: var(--gold);
  line-height: 1.15;
}
.page-about .ab-stats dd small {
  font-size: 12px;
  color: var(--grey);
  margin-left: 3px;
  font-weight: 500;
}

/* 通用分栏 */
.page-about .ab-split {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}
.page-about .ab-split__text p {
  color: var(--body-ink);
  line-height: 1.85;
  margin: 0 0 14px;
}
.page-about .ab-points {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .ab-points li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--grey);
}
.page-about .ab-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  background: var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}

.page-about .ab-figure {
  margin: 0;
}
.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--ink-700);
  border: 1px solid var(--line-soft);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}
.page-about .ab-figure .media__cap {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--grey);
  border-left: 2px solid var(--gold);
  padding-left: 10px;
}
.page-about .ab-figure--mid {
  margin-top: clamp(28px, 4vw, 44px);
  max-width: 860px;
}

/* 区块标题 */
.page-about .ab-sec-head {
  max-width: 62ch;
  margin-bottom: clamp(24px, 4vw, 40px);
}
.page-about .ab-sec-head__lede {
  color: var(--body-ink);
  line-height: 1.8;
  margin: 0;
}

/* 档案室 */
.page-about .ab-compare {
  display: grid;
  gap: 14px;
  border: 1px solid var(--line-cyan);
  background: linear-gradient(160deg, rgba(16, 38, 58, 0.6), rgba(6, 17, 31, 0.9));
  padding: clamp(16px, 3vw, 26px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}
.page-about .ab-compare__col {
  border-left: 2px solid var(--line-soft);
  padding-left: 14px;
}
.page-about .ab-compare__col--a { border-left-color: var(--cyan); }
.page-about .ab-compare__col--b { border-left-color: var(--gold); }
.page-about .ab-compare__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist);
  margin: 0 0 10px;
}
.page-about .ab-compare__col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.page-about .ab-compare__col li {
  font-size: 14px;
  line-height: 1.7;
  color: var(--body-ink);
}
.page-about .ab-compare__axis {
  display: flex;
  align-items: center;
  gap: 10px;
}
.page-about .ab-compare__axis::before,
.page-about .ab-compare__axis::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line-soft);
}
.page-about .ab-compare__axis span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--coral);
  white-space: nowrap;
}

.page-about .ab-archive__foot {
  margin-top: clamp(20px, 3vw, 32px);
  display: grid;
  gap: clamp(20px, 3.5vw, 34px);
}
.page-about .ab-fold {
  border: 1px solid var(--line-soft);
  background: var(--ink-800);
  padding: 14px 16px;
}
.page-about .ab-fold summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  list-style: none;
}
.page-about .ab-fold summary::-webkit-details-marker { display: none; }
.page-about .ab-fold summary::before {
  content: "+ ";
  color: var(--gold);
}
.page-about .ab-fold[open] summary::before { content: "− "; }
.page-about .ab-fold summary:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--cyan) inset;
}
.page-about .ab-fold__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .ab-fold__list li {
  font-size: 14px;
  line-height: 1.75;
  color: var(--body-ink);
  padding-left: 12px;
  border-left: 1px solid var(--line-soft);
}
.page-about .ab-fold__list strong { color: var(--mist); }

/* 团队 */
.page-about .ab-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .ab-team__card {
  position: relative;
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  padding: 20px 18px 18px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}
.page-about .ab-team__card::after {
  content: "";
  position: absolute;
  left: 18px;
  top: 0;
  width: 34px;
  height: 2px;
  background: var(--cyan);
}
.page-about .ab-team__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
}
.page-about .ab-team__card h3 {
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--mist);
  margin: 6px 0 10px;
}
.page-about .ab-team__card p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--body-ink);
  margin: 0 0 10px;
}
.page-about .ab-team__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--grey) !important;
  padding-top: 10px;
  border-top: 1px dashed var(--line-soft);
  margin: 0 !important;
}

/* 流程 */
.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  counter-reset: none;
}
.page-about .ab-steps__item {
  position: relative;
  background: linear-gradient(120deg, rgba(16, 38, 58, 0.85), rgba(11, 27, 43, 0.5));
  border-left: 2px solid var(--cyan);
  padding: 16px 18px;
}
.page-about .ab-steps__no {
  font-family: var(--font-mono);
  font-size: clamp(20px, 4vw, 28px);
  font-weight: 700;
  color: rgba(45, 226, 230, 0.4);
  line-height: 1;
}
.page-about .ab-steps__item h3 {
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--mist);
  margin: 8px 0 8px;
}
.page-about .ab-steps__item p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--body-ink);
  margin: 0;
}
.page-about .ab-flow__tail {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--grey);
}

/* 品质 */
.page-about .ab-quality__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}
.page-about .ab-quality p {
  color: var(--body-ink);
  line-height: 1.85;
  margin: 0 0 12px;
}
.page-about .ab-quality__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .ab-quality__list li {
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--gold);
  background: var(--ink-800);
  padding: 14px 16px;
}
.page-about .ab-quality__list p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--body-ink);
}

/* 生态 */
.page-about .ab-eco__grid {
  display: grid;
  gap: 14px;
}
.page-about .ab-eco__card {
  border: 1px solid var(--line-cyan);
  background: radial-gradient(120% 120% at 0% 0%, rgba(45, 226, 230, 0.1), transparent 60%), var(--ink-800);
  padding: 20px 18px;
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}
.page-about .ab-eco__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 6vw, 40px);
  font-weight: 700;
  color: var(--gold);
  margin: 0 0 6px;
  line-height: 1;
}
.page-about .ab-eco__num small {
  font-size: 12px;
  color: var(--grey);
  margin-left: 4px;
  letter-spacing: 0.06em;
}
.page-about .ab-eco__card h3 {
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--mist);
  margin: 0 0 8px;
}
.page-about .ab-eco__card p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--body-ink);
  margin: 0;
}

/* 里程碑 */
.page-about .ab-miles {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
}
.page-about .ab-years ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .ab-years a {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--grey);
  text-decoration: none;
  border: 1px solid var(--line-soft);
  padding: 7px 12px;
  white-space: nowrap;
  transition: color 180ms ease, border-color 180ms ease;
}
.page-about .ab-years a:hover,
.page-about .ab-years a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 20px;
  border-left: 1px solid var(--line-cyan);
  display: grid;
  gap: 20px;
}
.page-about .ab-mile {
  position: relative;
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  padding: 16px 18px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}
.page-about .ab-mile::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 22px;
  width: 10px;
  height: 10px;
  background: var(--gold);
  transform: rotate(45deg);
  box-shadow: 0 0 0 3px rgba(217, 164, 65, 0.15);
}
.page-about .ab-mile__year {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
  margin: 0 0 6px;
}
.page-about .ab-mile h3 {
  font-family: var(--font-display);
  font-size: 19px;
  color: var(--mist);
  margin: 0 0 8px;
}
.page-about .ab-mile p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--body-ink);
  margin: 0;
}

/* 收尾 */
.page-about .ab-cta {
  padding-bottom: clamp(40px, 6vw, 72px);
}
.page-about .ab-cta__inner {
  display: grid;
  gap: 20px;
  align-items: center;
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--gold);
  background: linear-gradient(120deg, rgba(217, 164, 65, 0.08), rgba(6, 17, 31, 0.9) 55%);
  padding: clamp(20px, 4vw, 34px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}
.page-about .ab-cta p {
  color: var(--body-ink);
  line-height: 1.8;
  margin: 0;
  max-width: 58ch;
}
.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 断点 */
@media (min-width: 720px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ab-team__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-eco__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-compare {
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: stretch;
    gap: 18px;
  }
  .page-about .ab-compare__axis {
    flex-direction: column;
    justify-content: center;
  }
  .page-about .ab-compare__axis::before,
  .page-about .ab-compare__axis::after {
    width: 1px;
    height: auto;
    flex: 1;
    min-height: 24px;
  }
  .page-about .ab-compare__axis span {
    writing-mode: vertical-rl;
    letter-spacing: 0.2em;
  }
}

@media (min-width: 940px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
  }
  .page-about .ab-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: center;
  }
  .page-about .ab-quality__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
  }
  .page-about .ab-archive__foot {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }
  .page-about .ab-miles {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 48px);
    align-items: start;
  }
  .page-about .ab-years ol {
    flex-direction: column;
    overflow: visible;
    position: sticky;
    top: calc(var(--header-h) + 24px);
    gap: 10px;
  }
  .page-about .ab-years a {
    display: block;
    text-align: center;
  }
  .page-about .ab-timeline {
    padding-left: 26px;
  }
  .page-about .ab-mile::before {
    left: -32px;
  }
  .page-about .ab-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 28px;
  }
  .page-about .ab-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-viz__scan {
    animation: none;
    opacity: 0.35;
  }
}