.page-about {
  --ab-shell: 1140px;
  --ab-pad: 20px;
  position: relative;
  color: var(--ks-mist);
  font-family: var(--ks-font-body);
  font-size: 16px;
  line-height: 1.6;
  background: linear-gradient(180deg, #071a15 0%, #081f18 42%, #071a15 100%);
  padding-bottom: 72px;
  overflow-x: hidden;
}

.page-about .ab-wrap {
  width: 100%;
  max-width: var(--ab-shell);
  margin-inline: auto;
  padding-inline: var(--ab-pad);
}

.page-about .ab-top-anchor {
  display: block;
  height: 0;
}

.page-about .breadcrumbs {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding-block: 14px 40px;
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: -20% -25% auto -25%;
  height: 165%;
  pointer-events: none;
  background:
    radial-gradient(58% 52% at 16% 6%, rgba(184, 255, 61, 0.16), transparent 64%),
    radial-gradient(48% 46% at 84% 2%, rgba(147, 183, 201, 0.16), transparent 62%),
    radial-gradient(42% 40% at 52% 34%, rgba(255, 107, 53, 0.08), transparent 72%);
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__title {
  margin: 14px 0 20px;
  max-width: 15ch;
  font-family: var(--ks-font-display);
  font-size: clamp(36px, 8vw, 76px);
  font-weight: 700;
  line-height: 0.98;
  letter-spacing: 0.01em;
  color: var(--ks-mist);
}

.page-about .ab-hero__lede {
  margin: 0;
  max-width: 54ch;
  font-size: clamp(15px, 2.1vw, 18px);
  line-height: 1.68;
  color: rgba(217, 233, 223, 0.88);
}

.page-about .ab-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 32px 0 0;
  border: 1px solid var(--ks-line);
  background: var(--ks-line);
}

.page-about .ab-strip .data-strip__item {
  padding: 14px 16px;
  background: var(--ks-board);
}

.page-about .ab-strip .data-strip__label {
  display: block;
  font-family: var(--ks-font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--ks-steel);
  text-transform: uppercase;
}

.page-about .ab-strip__value {
  display: block;
  margin: 6px 0 0;
  font-family: var(--ks-font-mono);
  font-size: clamp(18px, 3.2vw, 24px);
  font-weight: 500;
  line-height: 1.15;
  color: var(--ks-lime);
  font-variant-numeric: tabular-nums;
}

/* ---------- 章节索引 ---------- */
.page-about .ab-index {
  position: sticky;
  top: var(--ks-header-h, 64px);
  z-index: 5;
  margin-top: 4px;
  border-block: 1px solid var(--ks-line);
  background: rgba(7, 26, 21, 0.9);
  backdrop-filter: blur(10px);
}

.page-about .ab-index__list {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 8px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .ab-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 13px;
  color: var(--ks-steel);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--ks-fast) var(--ks-ease),
    border-color var(--ks-fast) var(--ks-ease),
    background-color var(--ks-fast) var(--ks-ease);
}

.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible {
  color: var(--ks-mist);
  border-color: var(--ks-glass-line);
  background: var(--ks-glass);
}

.page-about .ab-index__link:focus-visible {
  outline: 2px solid var(--ks-lime);
  outline-offset: 2px;
}

.page-about .ab-index__num {
  font-family: var(--ks-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ks-lime);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-chapter {
  padding-block: 8px 52px;
}

.page-about .ab-chapter__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  padding-top: 28px;
  border-top: 1px solid var(--ks-line);
}

.page-about .ab-chapter__num {
  display: block;
  font-family: var(--ks-font-mono);
  font-size: clamp(38px, 11vw, 60px);
  font-weight: 700;
  line-height: 0.82;
  letter-spacing: -0.02em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(184, 255, 61, 0.62);
}

.page-about .ab-chapter__title {
  margin: 10px 0 16px;
  max-width: 24ch;
  font-family: var(--ks-font-display);
  font-size: clamp(25px, 4.6vw, 40px);
  font-weight: 600;
  line-height: 1.14;
  letter-spacing: 0.01em;
  color: var(--ks-mist);
}

.page-about .ab-chapter__body p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.68;
  color: rgba(217, 233, 223, 0.86);
}

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

.page-about .ab-link {
  color: var(--ks-lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(184, 255, 61, 0.42);
  transition: border-color var(--ks-fast) var(--ks-ease);
}

.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  border-bottom-color: var(--ks-lime);
}

.page-about .ab-link:focus-visible {
  outline: 2px solid var(--ks-lime);
  outline-offset: 2px;
}

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  margin: 4px 0 0;
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--ks-line-strong);
  border-radius: 4px;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.05);
}

.page-about .ab-figure figcaption {
  margin-top: 10px;
  font-family: var(--ks-font-mono);
  font-size: 11px;
  line-height: 1.55;
  letter-spacing: 0.05em;
  color: var(--ks-steel);
}

.page-about .ab-figure--inline {
  margin-top: 26px;
}

/* ---------- 标签页 ---------- */
.page-about .ab-tabs {
  margin: 26px 0 0;
}

.page-about .ab-tabs__list {
  position: relative;
  display: flex;
  gap: 2px;
  border-bottom: 1px solid var(--ks-line);
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .ab-tabs__list::-webkit-scrollbar {
  display: none;
}

.page-about .ab-tab {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 14px;
  border: 0;
  background: transparent;
  color: var(--ks-steel);
  font-family: var(--ks-font-body);
  font-size: 14px;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: color var(--ks-fast) var(--ks-ease),
    background-color var(--ks-fast) var(--ks-ease);
}

.page-about .ab-tab:hover {
  color: var(--ks-mist);
  background: rgba(184, 255, 61, 0.06);
}

.page-about .ab-tab[aria-selected="true"] {
  color: var(--ks-mist);
  background: var(--ks-glass);
}

.page-about .ab-tab:focus-visible {
  outline: 2px solid var(--ks-lime);
  outline-offset: -2px;
}

.page-about .ab-tabs__indicator {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0;
  height: 2px;
  background: var(--ks-lime);
  transition: transform var(--ks-base) var(--ks-ease),
    width var(--ks-base) var(--ks-ease);
}

.page-about .ab-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex: 0 0 auto;
}

.page-about .ab-dot--lime {
  background: var(--ks-lime);
}

.page-about .ab-dot--steel {
  background: var(--ks-steel);
}

.page-about .ab-dot--orange {
  background: var(--ks-orange);
}

.page-about .ab-dot--mint {
  background: var(--ks-mint);
}

.page-about .ab-tabpanel {
  padding-top: 22px;
}

.page-about .ab-tabpanel__title {
  margin: 0 0 8px;
  font-family: var(--ks-font-display);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ks-lime);
}

.page-about .ab-tabpanel p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.68;
  color: rgba(217, 233, 223, 0.84);
}

.page-about .ab-note {
  margin-top: 22px;
  padding: 14px 16px;
  border-left: 2px solid var(--ks-glass-line);
  background: rgba(18, 53, 43, 0.6);
  font-size: 14px;
  line-height: 1.7;
  color: rgba(217, 233, 223, 0.78);
}

/* ---------- 流程 ---------- */
.page-about .ab-flow {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px dashed rgba(147, 183, 201, 0.26);
}

.page-about .ab-flow__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px dashed rgba(147, 183, 201, 0.26);
}

.page-about .ab-flow__tick {
  font-family: var(--ks-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ks-orange);
  text-transform: uppercase;
}

.page-about .ab-flow__title {
  margin: 4px 0 6px;
  font-family: var(--ks-font-display);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ks-mist);
}

.page-about .ab-flow__text p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.66;
  color: rgba(217, 233, 223, 0.82);
}

/* ---------- 折叠 ---------- */
.page-about .ab-fold {
  margin-top: 12px;
  padding: 0 16px;
  border: 1px solid var(--ks-line);
  border-radius: 4px;
  background: var(--ks-board);
}

.page-about .ab-fold summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 0;
  list-style: none;
  cursor: pointer;
  font-family: var(--ks-font-display);
  font-size: 17px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--ks-mist);
}

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

.page-about .ab-fold summary::after {
  content: "+";
  font-family: var(--ks-font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--ks-lime);
  flex: 0 0 auto;
}

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

.page-about .ab-fold summary:focus-visible {
  outline: 2px solid var(--ks-lime);
  outline-offset: 2px;
}

.page-about .ab-fold__body {
  padding-bottom: 14px;
}

.page-about .ab-fold__body p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.68;
  color: rgba(217, 233, 223, 0.8);
}

/* ---------- 档案数字 ---------- */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 24px 0;
  border: 1px solid var(--ks-line);
  background: var(--ks-line);
}

.page-about .ab-stat {
  padding: 18px 16px;
  background: var(--ks-panel);
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--ks-font-mono);
  font-size: clamp(26px, 5.4vw, 38px);
  font-weight: 600;
  line-height: 1;
  color: var(--ks-lime);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ks-steel);
}

/* ---------- 玻璃引用 ---------- */
.page-about .ab-quote {
  margin: 20px 0;
  padding: 18px 18px;
  border: 1px solid var(--ks-glass-line);
  border-radius: var(--ks-radius-lg);
  background: var(--ks-glass);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.page-about .ab-quote p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(217, 233, 223, 0.9);
}

/* ---------- 理由列表 ---------- */
.page-about .ab-reasons {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-reasons__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--ks-line);
}

.page-about .ab-reasons__item:last-child {
  border-bottom: 1px solid var(--ks-line);
}

.page-about .ab-reasons__num {
  font-family: var(--ks-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ks-steel);
  padding-top: 4px;
}

.page-about .ab-reasons__title {
  margin: 0 0 6px;
  font-family: var(--ks-font-display);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ks-mist);
}

.page-about .ab-reasons__item p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.66;
  color: rgba(217, 233, 223, 0.8);
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta {
  position: relative;
  margin-top: 20px;
  padding-block: 44px;
  border-block: 1px solid var(--ks-glass-line);
  background: linear-gradient(135deg, rgba(18, 53, 43, 0.96), rgba(11, 38, 32, 0.96));
  overflow: hidden;
}

.page-about .ab-cta::before {
  content: "";
  position: absolute;
  inset: auto -10% -70% 40%;
  height: 220%;
  pointer-events: none;
  background: radial-gradient(50% 50% at 50% 50%, rgba(184, 255, 61, 0.14), transparent 68%);
}

.page-about .ab-cta__inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-cta__title {
  margin: 0 0 10px;
  font-family: var(--ks-font-display);
  font-size: clamp(26px, 5vw, 40px);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: 0.01em;
  color: var(--ks-mist);
}

.page-about .ab-cta__text {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.68;
  color: rgba(217, 233, 223, 0.82);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .ab-totop {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 32px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--ks-line-strong);
  font-family: var(--ks-font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ks-steel);
  text-decoration: none;
  transition: color var(--ks-fast) var(--ks-ease),
    border-color var(--ks-fast) var(--ks-ease);
}

.page-about .ab-totop:hover,
.page-about .ab-totop:focus-visible {
  color: var(--ks-lime);
  border-bottom-color: var(--ks-lime);
}

.page-about .ab-totop:focus-visible {
  outline: 2px solid var(--ks-lime);
  outline-offset: 3px;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about .ab-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-flow__item {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }

  .page-about .ab-flow__tick {
    padding-top: 6px;
  }

  .page-about .ab-reasons__item {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 20px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about {
    --ab-pad: 32px;
    padding-bottom: 96px;
  }

  .page-about .ab-hero {
    padding-block: 28px 56px;
  }

  .page-about .ab-chapter {
    padding-block: 16px 72px;
  }

  .page-about .ab-chapter__inner {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 24px 44px;
    padding-top: 36px;
  }

  .page-about .ab-chapter--media .ab-chapter__inner {
    grid-template-columns: 104px minmax(0, 1fr) minmax(0, 0.92fr);
  }

  .page-about .ab-chapter__num {
    position: sticky;
    top: calc(var(--ks-header-h, 64px) + 72px);
    font-size: 88px;
  }

  .page-about .ab-index__list {
    flex-wrap: wrap;
    overflow: visible;
    padding: 10px 0;
  }

  .page-about .ab-tabs__list {
    overflow: visible;
  }

  .page-about .ab-figure img {
    max-height: 420px;
  }
}

@media (min-width: 1200px) {
  .page-about .ab-chapter__num {
    font-size: 96px;
  }
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .ab-index__link,
  .page-about .ab-tab,
  .page-about .ab-tabs__indicator,
  .page-about .ab-totop,
  .page-about .ab-link {
    transition: none;
  }
}
<<<END>>>