.page-about {
  --ab-paper-line: rgba(23, 51, 39, 0.16);
  --ab-paper-line-soft: rgba(23, 51, 39, 0.09);
  background: var(--pb-ink-950);
  color: var(--pb-cream-50);
  overflow-x: hidden;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* 面包屑 */
.page-about .ab-crumb {
  background: var(--pb-ink-950);
  padding: 18px 0 0;
}

.page-about .pb-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--pb-font-mono);
  font-size: var(--pb-fs-12);
  letter-spacing: 0.08em;
  color: var(--pb-paper-200);
}

.page-about .pb-crumbs__link {
  color: var(--pb-paper-200);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .pb-crumbs__link:hover,
.page-about .pb-crumbs__link:focus-visible {
  color: var(--pb-lime-400);
  border-color: var(--pb-edge-lime);
}

.page-about .pb-crumbs__sep {
  color: var(--pb-moss-700);
}

.page-about .ab-crumb__here {
  color: var(--pb-cream-50);
}

/* 首屏 */
.page-about .ab-hero {
  position: relative;
  background:
    radial-gradient(110% 80% at 84% 0%, rgba(200, 255, 77, 0.12), transparent 62%),
    radial-gradient(90% 70% at 0% 100%, rgba(123, 232, 210, 0.08), transparent 60%),
    var(--pb-ink-950);
  padding: clamp(26px, 5vw, 54px) 0 clamp(40px, 7vw, 88px);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(246, 240, 228, 0.2) 1px, transparent 1px);
  background-size: 6px 6px;
  opacity: 0.16;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 72%);
  mask-image: linear-gradient(to bottom, #000 0%, transparent 72%);
}

.page-about .ab-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 4vw, 36px);
}

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

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

.page-about .ab-hero__kicker {
  margin: 0;
  font-family: var(--pb-font-mono);
  font-size: var(--pb-fs-12);
  letter-spacing: 0.14em;
  color: var(--pb-lime-400);
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  font-family: var(--pb-font-display);
  font-weight: 800;
  font-size: clamp(34px, 8.2vw, 76px);
  line-height: 0.98;
  letter-spacing: -0.03em;
  color: var(--pb-cream-50);
}

.page-about .ab-hero__title-line {
  display: block;
}

.page-about .ab-hero__title-line--accent {
  color: var(--pb-lime-400);
}

.page-about .ab-hero__lead {
  margin: clamp(18px, 3vw, 26px) 0 0;
  max-width: 54ch;
  font-size: var(--pb-fs-17);
  line-height: 1.8;
  color: rgba(246, 240, 228, 0.84);
}

.page-about .ab-hero__facts {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 1px;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  background: var(--pb-edge-soft);
  border-top: 1px solid var(--pb-edge);
  border-bottom: 1px solid var(--pb-edge);
}

.page-about .ab-hero__fact {
  background: var(--pb-ink-950);
  padding: 14px 16px 16px;
}

.page-about .ab-hero__fact-num {
  display: block;
  font-family: var(--pb-font-display);
  font-weight: 800;
  font-size: var(--pb-fs-34);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--pb-lime-400);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-hero__fact-key {
  display: block;
  margin-top: 8px;
  font-size: var(--pb-fs-13);
  line-height: 1.6;
  color: var(--pb-paper-200);
}

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: 76px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-hero__rail {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    padding-top: 6px;
    border-left: 1px solid var(--pb-edge);
    padding-left: 14px;
  }

  .page-about .ab-hero__rail-brand {
    writing-mode: vertical-rl;
    font-family: var(--pb-font-display);
    font-weight: 700;
    font-size: var(--pb-fs-20);
    letter-spacing: 0.28em;
    color: var(--pb-lime-400);
  }

  .page-about .ab-hero__rail-rule {
    width: 1px;
    height: 42px;
    background: var(--pb-edge);
  }

  .page-about .ab-hero__rail-year {
    writing-mode: vertical-rl;
    font-family: var(--pb-font-mono);
    font-size: var(--pb-fs-12);
    letter-spacing: 0.16em;
    color: var(--pb-paper-200);
    font-variant-numeric: tabular-nums;
  }

  .page-about .ab-hero__rail-scale {
    width: 9px;
    height: 150px;
    background: repeating-linear-gradient(
      to bottom,
      var(--pb-moss-700) 0 1px,
      transparent 1px 11px
    );
    border-right: 1px solid var(--pb-edge);
  }
}

/* 长文外壳 */
.page-about .ab-doc {
  background: var(--pb-cream-50);
  color: var(--pb-ink-950);
  padding: clamp(34px, 6vw, 72px) 0 clamp(46px, 8vw, 96px);
}

.page-about .ab-doc__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
  align-items: start;
}

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

/* 章节索引 */
.page-about .ab-toc {
  min-width: 0;
}

.page-about .ab-toc__label {
  margin: 0;
  font-family: var(--pb-font-mono);
  font-size: var(--pb-fs-12);
  letter-spacing: 0.14em;
  color: var(--pb-rust-600);
}

.page-about .ab-toc__list {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 10px 0 0;
  padding: 0 0 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

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

.page-about .ab-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 7px 13px;
  border: 1px solid var(--ab-paper-line);
  border-radius: var(--pb-radius-pill);
  font-size: var(--pb-fs-13);
  color: var(--pb-pitch-800);
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.page-about .ab-toc__no {
  font-family: var(--pb-font-mono);
  font-size: var(--pb-fs-12);
  color: var(--pb-rust-600);
}

.page-about .ab-toc__link:hover,
.page-about .ab-toc__link:focus-visible {
  background: var(--pb-pitch-800);
  border-color: var(--pb-pitch-800);
  color: var(--pb-cream-50);
}

.page-about .ab-toc__link:hover .ab-toc__no,
.page-about .ab-toc__link:focus-visible .ab-toc__no {
  color: var(--pb-lime-400);
}

@media (min-width: 1040px) {
  .page-about .ab-doc__grid {
    grid-template-columns: 186px minmax(0, 1fr);
    gap: clamp(30px, 4vw, 64px);
  }

  .page-about .ab-toc {
    position: sticky;
    top: 24px;
  }

  .page-about .ab-toc__list {
    display: grid;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--ab-paper-line);
  }

  .page-about .ab-toc__link {
    display: flex;
    width: 100%;
    padding: 8px 10px 8px 14px;
    border: 0;
    border-radius: 0;
    white-space: normal;
    line-height: 1.5;
  }

  .page-about .ab-toc__link:hover,
  .page-about .ab-toc__link:focus-visible {
    background: rgba(23, 51, 39, 0.06);
    color: var(--pb-ink-950);
  }

  .page-about .ab-toc__link:hover .ab-toc__no,
  .page-about .ab-toc__link:focus-visible .ab-toc__no {
    color: var(--pb-rust-600);
  }
}

/* 章节通用 */
.page-about .ab-chapter {
  scroll-margin-top: 24px;
}

.page-about .ab-chapter + .ab-chapter,
.page-about .ab-chapter + .ab-stats,
.page-about .ab-stats + .ab-chapter {
  margin-top: clamp(34px, 6vw, 68px);
}

.page-about .ab-kicker {
  margin: 0;
  font-family: var(--pb-font-mono);
  font-size: var(--pb-fs-12);
  letter-spacing: 0.14em;
  color: var(--pb-rust-600);
}

.page-about .ab-kicker--lime {
  color: var(--pb-lime-400);
}

.page-about .ab-h2 {
  margin: 12px 0 0;
  font-family: var(--pb-font-display);
  font-weight: 800;
  font-size: clamp(26px, 5vw, 46px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--pb-ink-950);
  max-width: 22ch;
}

.page-about .ab-h3 {
  margin: 0;
  font-size: var(--pb-fs-17);
  font-weight: 700;
  line-height: 1.4;
  color: var(--pb-ink-950);
}

.page-about .ab-p {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: var(--pb-fs-17);
  line-height: 1.8;
  color: var(--pb-pitch-800);
}

.page-about .ab-dropcap::first-letter {
  float: left;
  font-family: var(--pb-font-display);
  font-weight: 800;
  font-size: 3.4em;
  line-height: 0.84;
  padding: 6px 12px 0 0;
  color: var(--pb-rust-600);
}

.page-about .ab-quote {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 4px 0 4px 18px;
  border-left: 3px solid var(--pb-rust-600);
  font-family: var(--pb-font-display);
  font-weight: 700;
  font-size: clamp(20px, 3.4vw, 26px);
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: var(--pb-moss-700);
  max-width: 24ch;
}

/* 深色章节面板 */
.page-about .ab-chapter--ink {
  background: var(--pb-ink-950);
  color: var(--pb-cream-50);
  border-radius: 28px 4px 28px 4px;
  padding: clamp(22px, 4vw, 46px);
  box-shadow: var(--pb-shadow);
  border: 1px solid var(--pb-edge-soft);
}

.page-about .ab-chapter--ink .ab-h2 {
  color: var(--pb-cream-50);
}

.page-about .ab-chapter--ink .ab-h3 {
  color: var(--pb-cream-50);
}

.page-about .ab-chapter--ink .ab-p {
  color: var(--pb-paper-200);
}

/* 年份跳转 */
.page-about .ab-years {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

.page-about .ab-years__item {
  padding: 6px 14px;
  border: 1px solid var(--pb-edge);
  border-radius: var(--pb-radius-pill);
  font-family: var(--pb-font-mono);
  font-size: var(--pb-fs-13);
  letter-spacing: 0.08em;
  color: var(--pb-cream-50);
  text-decoration: none;
  font-variant-numeric: tabular-nums;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.page-about .ab-years__item:hover,
.page-about .ab-years__item:focus-visible {
  background: rgba(200, 255, 77, 0.14);
  border-color: var(--pb-edge-lime);
  color: var(--pb-lime-400);
}

/* 时间轴 */
.page-about .ab-timeline {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .ab-stage {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 0;
  border-top: 1px solid var(--pb-edge);
  scroll-margin-top: 24px;
}

.page-about .ab-stage__year {
  font-family: var(--pb-font-mono);
  font-size: var(--pb-fs-17);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  color: var(--pb-lime-400);
  padding-top: 1px;
}

.page-about .ab-stage__body {
  position: relative;
  border-left: 1px solid rgba(200, 255, 77, 0.24);
  padding-left: 18px;
  min-width: 0;
}

.page-about .ab-stage__body::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 8px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--pb-lime-400);
}

.page-about .ab-stage__body .ab-p {
  margin-top: 8px;
  font-size: var(--pb-fs-15);
}

@media (min-width: 720px) {
  .page-about .ab-stage {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 20px;
    padding: 20px 0;
  }
}

/* 图片 */
.page-about .ab-figure {
  margin: clamp(22px, 4vw, 34px) 0 0;
}

.page-about .ab-figure__cap {
  margin-top: 10px;
  font-size: var(--pb-fs-13);
  line-height: 1.7;
  color: var(--pb-moss-700);
  max-width: 58ch;
}

.page-about .ab-chapter--ink .ab-figure__cap {
  color: var(--pb-paper-200);
}

/* 角色分工 */
.page-about .ab-roles {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border-top: 1px solid var(--ab-paper-line);
}

.page-about .ab-role {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  column-gap: 12px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--ab-paper-line-soft);
}

.page-about .ab-role__no {
  grid-row: 1 / span 2;
  font-family: var(--pb-font-mono);
  font-size: var(--pb-fs-12);
  color: var(--pb-rust-600);
}

.page-about .ab-role__name {
  font-size: var(--pb-fs-20);
  font-weight: 700;
  color: var(--pb-ink-950);
}

.page-about .ab-role__count {
  grid-column: 2;
  grid-row: 1;
  justify-self: end;
  font-family: var(--pb-font-mono);
  font-size: var(--pb-fs-13);
  color: var(--pb-moss-700);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-role__desc {
  grid-column: 2;
  margin: 6px 0 0;
  font-size: var(--pb-fs-15);
  line-height: 1.75;
  color: var(--pb-pitch-800);
  max-width: 56ch;
}

@media (min-width: 720px) {
  .page-about .ab-role {
    grid-template-columns: 44px minmax(0, 1fr) auto;
    column-gap: 16px;
  }

  .page-about .ab-role__count {
    grid-column: 3;
    justify-self: end;
  }

  .page-about .ab-role__desc {
    grid-column: 2 / -1;
  }
}

/* 战报四段 */
.page-about .ab-segments {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .ab-seg {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 0;
  border-top: 1px solid var(--pb-edge-soft);
}

.page-about .ab-seg:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-seg__no {
  font-family: var(--pb-font-mono);
  font-size: var(--pb-fs-13);
  color: var(--pb-lime-400);
  font-variant-numeric: tabular-nums;
  padding-top: 2px;
}

.page-about .ab-seg .ab-p {
  margin-top: 6px;
  font-size: var(--pb-fs-15);
}

/* 折叠 */
.page-about .ab-fold {
  margin-top: 14px;
  border: 1px solid var(--pb-edge);
  border-radius: var(--pb-radius-md);
  background: rgba(23, 51, 39, 0.55);
  overflow: hidden;
}

.page-about .ab-fold__sum {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 18px;
  cursor: pointer;
  list-style: none;
  font-size: var(--pb-fs-15);
  font-weight: 600;
  color: var(--pb-cream-50);
}

.page-about .ab-fold__sum::-webkit-details-marker {
  display: none;
}

.page-about .ab-fold__sum::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--pb-font-mono);
  font-size: var(--pb-fs-17);
  color: var(--pb-lime-400);
}

.page-about .ab-fold[open] .ab-fold__sum::after {
  content: "−";
}

.page-about .ab-fold__body {
  padding: 0 18px 16px;
}

.page-about .ab-fold__body .ab-p {
  margin-top: 0;
  font-size: var(--pb-fs-15);
}

/* 统计带 */
.page-about .ab-stats {
  margin-top: clamp(30px, 5vw, 56px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 18px;
  padding: clamp(22px, 4vw, 40px);
  background: linear-gradient(118deg, var(--pb-ink-950) 0%, var(--pb-pitch-800) 100%);
  border-top: 2px solid var(--pb-lime-400);
  border-radius: 4px 28px 4px 28px;
  color: var(--pb-cream-50);
}

.page-about .ab-stats__num {
  display: block;
  font-family: var(--pb-font-display);
  font-weight: 800;
  font-size: clamp(30px, 5vw, 48px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--pb-lime-400);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-stats__unit {
  font-size: 0.5em;
  margin-left: 2px;
  color: var(--pb-cyan-300);
}

.page-about .ab-stats__key {
  display: block;
  margin-top: 10px;
  font-size: var(--pb-fs-13);
  line-height: 1.65;
  color: var(--pb-paper-200);
}

@media (min-width: 760px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }
}

/* 覆盖条形 */
.page-about .ab-bars {
  display: grid;
  gap: 18px;
  margin-top: 26px;
}

.page-about .ab-bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .ab-bar__label {
  font-size: var(--pb-fs-17);
  font-weight: 700;
  color: var(--pb-ink-950);
}

.page-about .ab-bar__count {
  font-family: var(--pb-font-mono);
  font-size: var(--pb-fs-13);
  color: var(--pb-rust-600);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-bar__track {
  margin-top: 8px;
  height: 9px;
  border-radius: var(--pb-radius-pill);
  background: rgba(23, 51, 39, 0.12);
  overflow: hidden;
}

.page-about .ab-bar__fill {
  display: block;
  height: 100%;
  width: var(--ab-fill, 50%);
  border-radius: var(--pb-radius-pill);
  background: linear-gradient(90deg, var(--pb-pitch-800), var(--pb-moss-700));
}

.page-about .ab-bar--fb {
  --ab-fill: 59%;
}

.page-about .ab-bar--bb {
  --ab-fill: 26%;
}

.page-about .ab-bar--mix {
  --ab-fill: 15%;
}

/* 链接组 */
.page-about .ab-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(20px, 3vw, 28px) 0 0;
}

.page-about .ab-link {
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  border: 1px solid var(--ab-paper-line);
  border-radius: var(--pb-radius-pill);
  font-size: var(--pb-fs-15);
  color: var(--pb-ink-950);
  text-decoration: none;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  background: var(--pb-pitch-800);
  border-color: var(--pb-pitch-800);
  color: var(--pb-cream-50);
  transform: translateY(-2px);
}

.page-about .ab-link--lime {
  border-color: var(--pb-edge-lime);
  color: var(--pb-lime-400);
}

.page-about .ab-link--lime:hover,
.page-about .ab-link--lime:focus-visible {
  background: var(--pb-lime-400);
  border-color: var(--pb-lime-400);
  color: var(--pb-ink-950);
}

/* 服务与联络 */
.page-about .ab-chapter--service {
  max-width: 760px;
  border-top: 2px solid var(--pb-rust-600);
  padding-top: clamp(20px, 3vw, 30px);
}

.page-about .ab-contact {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border-top: 1px solid var(--ab-paper-line);
}

.page-about .pb-contact-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--ab-paper-line-soft);
}

.page-about .pb-contact-line__key {
  flex: 0 0 84px;
  font-family: var(--pb-font-mono);
  font-size: var(--pb-fs-12);
  letter-spacing: 0.1em;
  color: var(--pb-moss-700);
}

.page-about .pb-contact-line__val {
  flex: 1 1 auto;
  min-width: 0;
  font-size: var(--pb-fs-17);
  color: var(--pb-ink-950);
  word-break: break-word;
}

.page-about .pb-copy {
  flex: 0 0 auto;
  padding: 6px 14px;
  border: 1px solid var(--ab-paper-line);
  border-radius: var(--pb-radius-pill);
  background: transparent;
  font-family: var(--pb-font-mono);
  font-size: var(--pb-fs-12);
  letter-spacing: 0.08em;
  color: var(--pb-pitch-800);
  cursor: pointer;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.page-about .pb-copy:hover,
.page-about .pb-copy:focus-visible {
  background: var(--pb-pitch-800);
  border-color: var(--pb-pitch-800);
  color: var(--pb-cream-50);
}

.page-about .pb-copy[data-copied] {
  background: var(--pb-lime-400);
  border-color: var(--pb-lime-400);
  color: var(--pb-ink-950);
}

/* 动效收敛 */
@media (prefers-reduced-motion: reduce) {
  .page-about .ab-years__item,
  .page-about .ab-toc__link,
  .page-about .ab-link,
  .page-about .pb-copy,
  .page-about .pb-crumbs__link {
    transition: none;
  }

  .page-about .ab-link:hover,
  .page-about .ab-link:focus-visible {
    transform: none;
  }
}
<<<END>>>