.page-about {
  --ab-line: rgba(232, 236, 241, .14);
  --ab-glass: rgba(28, 42, 87, .42);
  --ab-ink-soft: rgba(232, 236, 241, .78);
  background: var(--xk-void);
  color: var(--xk-silver);
  font-family: var(--xk-font-body);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(20px, 4vw, 36px) 0 clamp(38px, 7vw, 78px);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 68% 58% at 84% 10%, rgba(108, 92, 231, .30), transparent 66%),
    radial-gradient(ellipse 46% 46% at 4% 94%, rgba(255, 140, 66, .12), transparent 72%);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .55;
  background-image:
    radial-gradient(1.5px 1.5px at 22% 28%, rgba(232, 236, 241, .85), transparent 100%),
    radial-gradient(1px 1px at 66% 14%, rgba(232, 236, 241, .7), transparent 100%),
    radial-gradient(1.5px 1.5px at 46% 74%, rgba(232, 236, 241, .55), transparent 100%),
    radial-gradient(1px 1px at 89% 56%, rgba(232, 236, 241, .65), transparent 100%),
    radial-gradient(1px 1px at 9% 46%, rgba(232, 236, 241, .5), transparent 100%);
  background-repeat: no-repeat;
}

.page-about .ab-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 50px);
}

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

.page-about .xk-crumbs a {
  color: var(--xk-mist);
  text-decoration: none;
}

.page-about .xk-crumbs a:hover,
.page-about .xk-crumbs a:focus-visible {
  color: var(--xk-silver);
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  font-family: var(--xk-font-display);
  font-size: clamp(34px, 6vw, 66px);
  line-height: 1.04;
  letter-spacing: -.015em;
  font-weight: 300;
  color: var(--xk-silver);
}

.page-about .ab-hero__thin {
  display: block;
  font-weight: 200;
  color: rgba(232, 236, 241, .72);
}

.page-about .ab-hero__title strong {
  display: block;
  font-weight: 800;
  color: #FFFFFF;
  letter-spacing: -.03em;
}

.page-about .ab-hero__lede {
  max-width: 46ch;
  margin: 20px 0 0;
  font-size: clamp(16px, 1.7vw, 18px);
  line-height: 1.8;
  color: rgba(232, 236, 241, .86);
}

.page-about .ab-tagcard {
  position: relative;
  min-width: 0;
  padding: clamp(20px, 3vw, 26px);
  border: 1px solid var(--ab-line-strong, rgba(232, 236, 241, .3));
  border-radius: var(--xk-radius-m);
  background: linear-gradient(158deg, rgba(28, 42, 87, .66), rgba(11, 27, 58, .46));
  backdrop-filter: blur(10px);
  box-shadow: var(--xk-shadow-float);
}

.page-about .ab-tagcard::before {
  content: "";
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 1px;
  background: var(--xk-orange);
}

.page-about .ab-tagcard__label {
  margin: 0 0 14px;
  font-family: var(--xk-font-mono);
  font-size: 11px;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--xk-mist);
}

.page-about .ab-tagcard__list {
  margin: 0;
  padding: 0;
}

.page-about .ab-tagcard__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px dashed rgba(232, 236, 241, .14);
  font-size: 14px;
}

.page-about .ab-tagcard__row dt { color: var(--xk-mist); }

.page-about .ab-tagcard__row dd {
  margin: 0;
  font-family: var(--xk-font-mono);
  font-size: 14px;
  color: var(--xk-silver);
  text-align: right;
}

.page-about .ab-tagcard__note {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(232, 236, 241, .72);
}

/* ---------- 主体骨架 ---------- */
.page-about .ab-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(8px, 2vw, 24px);
  padding-bottom: clamp(48px, 9vw, 96px);
}

.page-about .ab-index {
  order: -1;
  min-width: 0;
}

.page-about .ab-index__label {
  display: none;
  margin: 0 0 14px;
  font-family: var(--xk-font-mono);
  font-size: 11px;
  letter-spacing: .26em;
  color: var(--xk-mist);
}

.page-about .ab-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  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: 8px 14px;
  border: 1px solid var(--ab-line);
  border-radius: 999px;
  background: rgba(19, 31, 69, .6);
  color: var(--xk-mist);
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  transition: color .24s var(--xk-ease), border-color .24s var(--xk-ease), background .24s var(--xk-ease);
}

.page-about .ab-index__link span {
  font-family: var(--xk-font-mono);
  font-size: 11px;
  color: rgba(255, 140, 66, .8);
}

.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible {
  color: var(--xk-silver);
  border-color: rgba(108, 92, 231, .7);
  background: rgba(108, 92, 231, .18);
  outline: none;
}

.page-about .ab-flows,
.page-about .ab-flow { min-width: 0; }

/* ---------- 章节 ---------- */
.page-about .ab-block {
  padding: clamp(32px, 6vw, 62px) 0;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-flow > .ab-block:first-child {
  border-top: 0;
  padding-top: clamp(12px, 2vw, 20px);
}

.page-about .ab-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(22px, 4vw, 36px);
}

.page-about .ab-head__num {
  font-family: var(--xk-font-mono);
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1;
  letter-spacing: .06em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(232, 236, 241, .38);
}

.page-about .ab-head__title {
  margin: 0;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.22;
  letter-spacing: -.01em;
  color: #FFFFFF;
}

.page-about .ab-head__lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--ab-ink-soft);
}

.page-about .ab-note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding-left: 16px;
  border-left: 2px solid rgba(255, 140, 66, .55);
  font-size: 14px;
  line-height: 1.8;
  color: rgba(232, 236, 241, .72);
}

/* ---------- 读者角色卡 ---------- */
.page-about .ab-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .ab-role {
  padding: clamp(18px, 3vw, 24px);
  border: 1px solid var(--ab-line);
  border-radius: var(--xk-radius-m);
  background: var(--ab-glass);
  transition: border-color .3s var(--xk-ease), transform .3s var(--xk-ease);
}

.page-about .ab-role:hover {
  border-color: rgba(108, 92, 231, .55);
  transform: translateY(-2px);
}

.page-about .ab-role__who {
  margin: 0 0 10px;
  font-family: var(--xk-font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--xk-orange);
}

.page-about .ab-role__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(232, 236, 241, .82);
}

/* ---------- 图片框 ---------- */
.page-about .ab-frame {
  position: relative;
  margin: clamp(22px, 4vw, 34px) 0 0;
  overflow: hidden;
  border: 1px solid var(--ab-line);
  border-radius: var(--xk-radius-l);
  background: var(--xk-indigo);
}

.page-about .ab-frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .ab-frame--tall img { aspect-ratio: 10 / 7; }

.page-about .ab-frame__cap {
  position: absolute;
  left: 14px;
  bottom: 12px;
  padding: 4px 9px;
  border-radius: 5px;
  background: rgba(11, 27, 58, .72);
  font-family: var(--xk-font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: rgba(255, 255, 255, .84);
}

/* ---------- 三级校订 ---------- */
.page-about .ab-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2.6vw, 20px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-step {
  position: relative;
  min-width: 0;
  padding: clamp(20px, 3vw, 26px) clamp(18px, 3vw, 24px);
  border: 1px solid var(--ab-line);
  border-radius: var(--xk-radius-m);
  background: linear-gradient(180deg, rgba(28, 42, 87, .5), rgba(11, 27, 58, .58));
}

.page-about .ab-step::before {
  content: "";
  position: absolute;
  top: 0;
  left: clamp(18px, 3vw, 24px);
  width: 42px;
  height: 2px;
  background: linear-gradient(90deg, var(--xk-violet), var(--xk-orange));
}

.page-about .ab-step__idx {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--xk-font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--xk-orange);
}

.page-about .ab-step__title {
  margin: 0 0 10px;
  font-size: clamp(17px, 2vw, 20px);
  color: #FFFFFF;
}

.page-about .ab-step__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(232, 236, 241, .8);
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 7px;
  width: 1px;
  background: linear-gradient(180deg, rgba(108, 92, 231, .75), rgba(255, 140, 66, .55), transparent);
}

.page-about .ab-tl-item {
  position: relative;
  padding: 0 0 clamp(22px, 3.4vw, 32px) 34px;
}

.page-about .ab-tl-item::before {
  content: "";
  position: absolute;
  top: 6px;
  left: 0;
  width: 15px;
  height: 15px;
  border: 1px solid var(--xk-orange);
  border-radius: 50%;
  background: var(--xk-void);
  box-shadow: 0 0 0 4px rgba(255, 140, 66, .08);
}

.page-about .ab-tl-item:last-child { padding-bottom: 0; }

.page-about .ab-tl__stage {
  margin: 0 0 6px;
  font-family: var(--xk-font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--xk-violet);
}

.page-about .ab-tl__title {
  margin: 0 0 8px;
  font-size: clamp(17px, 2vw, 21px);
  color: #FFFFFF;
}

.page-about .ab-tl__body {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(232, 236, 241, .78);
}

/* ---------- 团队与协作 ---------- */
.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 34px);
}

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

.page-about .ab-fold {
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-fold:first-child { border-top: 1px solid var(--ab-line); }

.page-about .ab-fold__sum {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 0;
  list-style: none;
  cursor: pointer;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.6;
  color: var(--xk-silver);
  transition: color .24s var(--xk-ease);
}

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

.page-about .ab-fold__sum::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--xk-font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--xk-violet);
}

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

.page-about .ab-fold__sum:hover { color: #FFFFFF; }

.page-about .ab-fold__sum:focus-visible {
  outline: 2px solid var(--xk-orange);
  outline-offset: 3px;
  border-radius: 4px;
}

.page-about .ab-fold__role {
  flex: none;
  padding: 2px 9px;
  border: 1px solid rgba(108, 92, 231, .55);
  border-radius: 999px;
  background: rgba(108, 92, 231, .16);
  font-family: var(--xk-font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--xk-silver);
}

.page-about .ab-fold__body {
  margin: 0 0 16px;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(232, 236, 241, .78);
}

.page-about .ab-team__media { margin-top: 0; }

/* ---------- 规模 ---------- */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--ab-line);
  border-radius: var(--xk-radius-m);
  background: var(--ab-line);
}

.page-about .ab-stat {
  padding: clamp(18px, 3vw, 26px);
  background: rgba(11, 27, 58, .78);
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--xk-font-mono);
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: #FFFFFF;
}

.page-about .ab-stat__num em {
  font-style: normal;
  font-size: .5em;
  letter-spacing: 0;
  color: var(--xk-orange);
}

.page-about .ab-stat__label {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--xk-mist);
}

/* ---------- 荣誉与合作 ---------- */
.page-about .ab-honors {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .ab-honor {
  min-width: 0;
  padding: clamp(20px, 3vw, 26px);
  border: 1px solid rgba(43, 29, 22, .18);
  border-radius: var(--xk-radius-m);
  background: var(--xk-cream);
  color: var(--xk-ink);
}

.page-about .ab-honor__kicker {
  margin: 0 0 10px;
  font-family: var(--xk-font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: #8A4A16;
}

.page-about .ab-honor__title {
  margin: 0 0 8px;
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.45;
  color: var(--xk-ink);
}

.page-about .ab-honor__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(43, 29, 22, .82);
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta {
  margin-top: clamp(34px, 6vw, 60px);
  padding: clamp(26px, 5vw, 46px);
  border: 1px solid var(--ab-line);
  border-radius: var(--xk-radius-l);
  background:
    radial-gradient(ellipse 80% 120% at 100% 0%, rgba(108, 92, 231, .34), transparent 70%),
    linear-gradient(150deg, rgba(28, 42, 87, .72), rgba(11, 27, 58, .88));
}

.page-about .ab-cta__title {
  margin: 0;
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.28;
  color: #FFFFFF;
}

.page-about .ab-cta__text {
  margin: 14px 0 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-ink-soft);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .ab-roles { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .ab-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 760px) {
  .page-about .ab-roles { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .ab-steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .ab-honors { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.16fr) minmax(0, .84fr);
    align-items: end;
  }
  .page-about .ab-team {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
    align-items: start;
  }
  .page-about .ab-team__media { margin-top: 0; }
}

@media (min-width: 960px) {
  .page-about .ab-stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 1040px) {
  .page-about .ab-shell {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 60px);
    align-items: start;
  }
  .page-about .ab-index {
    position: sticky;
    top: 96px;
    padding-top: 18px;
  }
  .page-about .ab-index__label { display: block; }
  .page-about .ab-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .ab-index__link {
    width: 100%;
    padding: 9px 12px;
    border-color: transparent;
    border-radius: 8px;
    background: transparent;
    font-size: 14px;
  }
  .page-about .ab-index__link:hover,
  .page-about .ab-index__link:focus-visible {
    border-color: rgba(108, 92, 231, .5);
    background: rgba(108, 92, 231, .14);
  }
  .page-about .ab-honors { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-role,
  .page-about .ab-index__link,
  .page-about .ab-fold__sum {
    transition: none;
  }
  .page-about .ab-role:hover { transform: none; }
}
<<<END>>>

.page-about {
  --ab-line-strong: currentColor;
}