.page-about {
  background: var(--ink-900);
  color: var(--paper-050);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.75;
  overflow-x: clip;
  --ab-line: 2px solid var(--line-600);
  --ab-tint: rgba(18, 224, 232, 0.08);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  padding-top: clamp(18px, 3.5vw, 34px);
  padding-bottom: clamp(28px, 5vw, 56px);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -34%;
  right: -14%;
  width: min(76%, 860px);
  height: 176%;
  background: linear-gradient(152deg, rgba(18, 224, 232, 0.24), rgba(11, 31, 54, 0.92) 52%, transparent 80%);
  clip-path: polygon(36% 0, 100% 0, 100% 100%, 0 68%);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.page-about .ab-hero .breadcrumbs {
  margin-bottom: clamp(18px, 3vw, 32px);
}

.page-about .ab-hero__title {
  margin: 0.22em 0 0.4em;
  font-size: clamp(2rem, 5.6vw, 4.1rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 900;
  max-width: 20ch;
  text-wrap: balance;
}

.page-about .ab-hero__hl {
  color: var(--cyan-500);
  box-shadow: inset 0 -0.16em 0 rgba(18, 224, 232, 0.3);
}

.page-about .ab-hero__lede {
  max-width: 46rem;
  margin: 0;
  font-size: var(--fs-md);
  line-height: 1.85;
  color: var(--gray-400);
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 14px 18px;
  margin: clamp(24px, 4vw, 40px) 0 clamp(20px, 3vw, 30px);
  padding: clamp(14px, 2vw, 20px) 0;
  border-top: var(--ab-line);
  border-bottom: var(--ab-line);
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .ab-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4.4vw, 2.7rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan-500);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-stat:nth-child(2) .ab-stat__num {
  color: var(--paper-050);
}

.page-about .ab-stat:nth-child(3) .ab-stat__num {
  color: var(--green-400);
}

.page-about .ab-stat__label {
  font-size: var(--fs-xs);
  letter-spacing: 0.04em;
  color: var(--gray-400);
  line-height: 1.5;
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 通栏图 ---------- */
.page-about .ab-banner {
  margin: 0;
}

.page-about .ab-banner__media {
  position: relative;
  overflow: hidden;
  border-top: var(--ab-line);
  border-bottom: var(--ab-line);
}

.page-about .ab-banner__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 20, 35, 0.2), rgba(6, 20, 35, 0.86));
  pointer-events: none;
}

.page-about .ab-banner img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}

.page-about .ab-banner figcaption {
  padding: 10px var(--gutter) 0;
  font-size: var(--fs-xs);
  color: var(--gray-400);
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

/* ---------- 主体骨架 ---------- */
.page-about .ab-shell {
  display: grid;
  gap: clamp(20px, 3.5vw, 40px);
  padding-top: clamp(28px, 5vw, 64px);
  padding-bottom: clamp(44px, 7vw, 96px);
}

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

/* ---------- 目录 ---------- */
.page-about .ab-toc {
  min-width: 0;
}

.page-about .ab-toc__title {
  display: none;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.22em;
  color: var(--gray-400);
}

.page-about .ab-toc__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

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

.page-about .ab-toc__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid var(--line-600);
  color: var(--gray-400);
  text-decoration: none;
  font-size: var(--fs-sm);
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.page-about .ab-toc__list a:hover,
.page-about .ab-toc__list a:focus-visible {
  color: var(--ink-900);
  background: var(--cyan-500);
  border-color: var(--cyan-500);
  outline: none;
}

.page-about .ab-toc__idx {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--cyan-500);
}

.page-about .ab-toc__list a:hover .ab-toc__idx,
.page-about .ab-toc__list a:focus-visible .ab-toc__idx {
  color: var(--ink-900);
}

/* ---------- 章节 ---------- */
.page-about .ab-sec {
  padding-top: clamp(22px, 3.5vw, 40px);
  border-top: var(--ab-line);
}

.page-about .ab-sec + .ab-sec {
  margin-top: clamp(34px, 5.5vw, 66px);
}

.page-about .ab-sec__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-bottom: clamp(16px, 2.5vw, 26px);
}

.page-about .ab-sec__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  color: var(--orange-500);
}

.page-about .ab-sec__title {
  margin: 0;
  font-size: clamp(1.45rem, 3.4vw, 2.35rem);
  line-height: 1.22;
  letter-spacing: -0.015em;
  font-weight: 900;
  max-width: 26ch;
}

.page-about .ab-split {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .ab-prose {
  margin: 0 0 1em;
  max-width: 44rem;
  line-height: 1.85;
  color: var(--paper-050);
}

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

.page-about .ab-prose--foot {
  margin-top: clamp(18px, 3vw, 28px);
  color: var(--gray-400);
}

/* ---------- 旁注 ---------- */
.page-about .ab-aside {
  border: var(--ab-line);
  background: var(--ink-800);
  padding: 16px 18px;
  box-shadow: var(--shadow-hard);
  align-self: start;
}

.page-about .ab-aside__k {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.2em;
  color: var(--cyan-500);
}

.page-about .ab-aside__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-aside__list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: baseline;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-600);
}

.page-about .ab-aside__list li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .ab-aside__n {
  font-family: var(--font-mono);
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--green-400);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.page-about .ab-aside__t {
  font-size: var(--fs-sm);
  color: var(--gray-400);
  line-height: 1.6;
}

/* ---------- 栏目卡片 ---------- */
.page-about .ab-sys {
  display: grid;
  gap: 14px;
}

.page-about .ab-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border: var(--ab-line);
  background: var(--ink-800);
  padding: 18px;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.page-about .ab-card:hover,
.page-about .ab-card:focus-within {
  border-color: var(--cyan-500);
  box-shadow: var(--shadow-hard);
  transform: translate(-2px, -2px);
}

.page-about .ab-card__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-xl);
  font-weight: 700;
  line-height: 1;
  color: var(--steel-700);
  letter-spacing: -0.02em;
}

.page-about .ab-card:hover .ab-card__idx,
.page-about .ab-card:focus-within .ab-card__idx {
  color: var(--cyan-500);
}

.page-about .ab-card__title {
  margin: 0;
  font-size: var(--fs-lg);
  font-weight: 900;
  letter-spacing: -0.01em;
}

.page-about .ab-card__text {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--gray-400);
}

.page-about .ab-card__link {
  margin-top: auto;
  align-self: flex-start;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  font-size: var(--fs-sm);
  color: var(--cyan-500);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .ab-card__link:hover,
.page-about .ab-card__link:focus-visible {
  color: var(--paper-050);
  border-bottom-color: var(--orange-500);
  outline: none;
}

.page-about .ab-note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 14px 16px;
  max-width: 48rem;
  border-left: 4px solid var(--orange-500);
  background: rgba(255, 107, 26, 0.07);
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: var(--gray-400);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-about .ab-matrix {
  border: var(--ab-line);
  background: var(--ink-800);
}

.page-about .ab-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line-600);
  border-left: 3px solid transparent;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .ab-row:last-child {
  border-bottom: none;
}

.page-about .ab-row:hover,
.page-about .ab-row:focus-within {
  border-left-color: var(--cyan-500);
  background: var(--ab-tint);
}

.page-about .ab-row__role {
  font-weight: 700;
  font-size: var(--fs-md);
  letter-spacing: 0.01em;
}

.page-about .ab-row__num {
  font-family: var(--font-mono);
  font-size: var(--fs-md);
  color: var(--green-400);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-about .ab-row__desc {
  grid-column: 1 / -1;
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--gray-400);
}

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  margin: 0;
  min-width: 0;
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--ab-line);
  filter: saturate(0.9) contrast(1.04);
}

.page-about .ab-figure--region img {
  aspect-ratio: 3 / 2;
}

.page-about .ab-figure figcaption {
  margin-top: 8px;
  font-size: var(--fs-xs);
  line-height: 1.6;
  color: var(--gray-400);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-tl {
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 26px;
  position: relative;
  display: grid;
  gap: 16px;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan-500), var(--green-400) 55%, var(--line-600));
}

.page-about .ab-tl__item {
  position: relative;
  border: var(--ab-line);
  background: var(--ink-800);
  padding: 16px 18px;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 22px;
  width: 12px;
  height: 12px;
  background: var(--ink-900);
  border: 2px solid var(--cyan-500);
  transform: rotate(45deg);
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .ab-tl__item:hover,
.page-about .ab-tl__item:focus-within {
  border-color: var(--cyan-500);
  transform: translateX(3px);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-tl__item:hover::before,
.page-about .ab-tl__item:focus-within::before {
  background: var(--green-400);
  border-color: var(--green-400);
}

.page-about .ab-tl__year {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: var(--fs-lg);
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--cyan-500);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-tl__title {
  margin: 0 0 8px;
  font-size: var(--fs-md);
  font-weight: 900;
  letter-spacing: -0.01em;
}

.page-about .ab-tl__text {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--gray-400);
}

.page-about .ab-tl__tag {
  display: inline-block;
  margin: 12px 0 0;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.1em;
  color: var(--green-400);
  border: 1px solid rgba(0, 245, 160, 0.42);
}

/* ---------- 合作 ---------- */
.page-about .ab-partners {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(18px, 3vw, 26px);
}

.page-about .ab-metric {
  border: var(--ab-line);
  background: var(--ink-800);
  padding: 16px 18px;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .ab-metric:hover {
  border-color: var(--orange-500);
  background: var(--steel-700);
}

.page-about .ab-metric__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 5vw, 2.9rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange-500);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-metric__label {
  display: block;
  margin-top: 8px;
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: var(--gray-400);
}

/* ---------- 地区与联系 ---------- */
.page-about .ab-region {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

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

.page-about .ab-contact {
  border: var(--ab-line);
  background: var(--ink-800);
  padding: 16px 18px;
  margin-bottom: 16px;
  box-shadow: 6px 6px 0 rgba(21, 58, 92, 0.6);
}

.page-about .ab-contact__k {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.2em;
  color: var(--cyan-500);
}

.page-about .ab-contact__line {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  align-items: baseline;
  margin: 0 0 8px;
  font-size: var(--fs-sm);
}

.page-about .ab-contact__line span {
  color: var(--gray-400);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.12em;
}

.page-about .ab-contact__line a {
  color: var(--paper-050);
  text-decoration: none;
  border-bottom: 1px solid var(--line-600);
  word-break: break-all;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .ab-contact__line a:hover,
.page-about .ab-contact__line a:focus-visible {
  color: var(--cyan-500);
  border-bottom-color: var(--cyan-500);
  outline: none;
}

.page-about .ab-contact__note {
  margin: 10px 0 14px;
  font-size: var(--fs-xs);
  line-height: 1.7;
  color: var(--gray-400);
}

.page-about .ab-filing {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  padding: 12px 16px;
  border: 1px solid var(--line-600);
  border-left: 4px solid var(--green-400);
  background: var(--teal-850);
}

.page-about .ab-filing__k {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.16em;
  color: var(--gray-400);
}

.page-about .ab-filing__v {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--paper-050);
  letter-spacing: 0.04em;
}

.page-about .ab-filing .copy-row {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about .ab-filing .copy-status {
  font-size: var(--fs-micro);
  font-family: var(--font-mono);
  color: var(--green-400);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .ab-row {
    grid-template-columns: 7.5rem 4rem minmax(0, 1fr);
    align-items: baseline;
  }

  .page-about .ab-row__desc {
    grid-column: auto;
  }

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

@media (min-width: 720px) {
  .page-about .ab-sys {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .ab-card:nth-child(1) {
    grid-column: span 3;
  }

  .page-about .ab-card:nth-child(2) {
    grid-column: span 3;
  }

  .page-about .ab-card:nth-child(3) {
    grid-column: span 2;
  }

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

@media (min-width: 880px) {
  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-region {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .ab-shell {
    grid-template-columns: minmax(0, 196px) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 68px);
  }

  .page-about .ab-toc {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
    border-left: 2px solid var(--line-600);
    padding-left: 14px;
  }

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

  .page-about .ab-toc__list {
    display: grid;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .ab-toc__list a {
    border: none;
    border-bottom: 1px solid transparent;
    background: none;
    padding: 7px 0;
    min-height: 0;
    white-space: normal;
    transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
      padding-left var(--dur) var(--ease);
  }

  .page-about .ab-toc__list a:hover,
  .page-about .ab-toc__list a:focus-visible {
    color: var(--cyan-500);
    background: none;
    border-bottom-color: var(--line-600);
    padding-left: 5px;
  }

  .page-about .ab-toc__list a:hover .ab-toc__idx,
  .page-about .ab-toc__list a:focus-visible .ab-toc__idx {
    color: var(--green-400);
  }

  .page-about .ab-hero__title {
    max-width: 22ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-card,
  .page-about .ab-tl__item,
  .page-about .ab-row,
  .page-about .ab-metric,
  .page-about .ab-toc__list a,
  .page-about .ab-card__link,
  .page-about .ab-contact__line a {
    transition: none;
  }

  .page-about .ab-card:hover,
  .page-about .ab-card:focus-within,
  .page-about .ab-tl__item:hover,
  .page-about .ab-tl__item:focus-within {
    transform: none;
  }
}
<<<END>>>