.page-about {
  --ab-cut: 22px;
  --ab-gap: clamp(16px, 2.4vw, 24px);
  background: var(--c-deep);
  color: var(--text);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding-block: calc(var(--head-h) + 40px) clamp(48px, 7vw, 88px);
  background:
    radial-gradient(120% 90% at 8% 0%, rgba(41, 224, 214, .14), transparent 62%),
    radial-gradient(110% 85% at 92% 8%, rgba(255, 92, 26, .18), transparent 60%),
    var(--c-deep);
  color: var(--c-night);
  overflow: hidden;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 7px;
  background-image: repeating-linear-gradient(to right, var(--ln-on-deep) 0 1px, transparent 1px 18px);
  pointer-events: none;
}

.page-about .ab-hero__frame {
  position: relative;
  padding: clamp(24px, 4vw, 56px);
  border: 1px solid var(--ln-on-deep);
  border-radius: var(--radius-lg);
  background: rgba(18, 41, 74, .34);
}

.page-about .ab-hero__frame::before,
.page-about .ab-hero__frame::after {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  border: 2px solid var(--c-cyan);
  pointer-events: none;
}

.page-about .ab-hero__frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
  border-top-left-radius: var(--radius-lg);
}

.page-about .ab-hero__frame::after {
  right: -1px;
  bottom: -1px;
  border-left: 0;
  border-top: 0;
  border-bottom-right-radius: var(--radius-lg);
}

.page-about .ab-hero__frame .breadcrumb {
  margin-bottom: var(--space-4);
}

.page-about .ab-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 4.6vw, 56px);
  line-height: 1.16;
  letter-spacing: -.015em;
  color: #fff;
  margin: var(--space-3) 0 0;
  max-width: 20ch;
}

.page-about .ab-hero__cols {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.page-about .ab-hero__lead {
  margin: 0;
  font-size: clamp(15.5px, 1.4vw, 18px);
  line-height: 1.85;
  color: var(--c-night);
  max-width: 60ch;
}

.page-about .ab-index {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--ln-on-deep);
}

.page-about .ab-index a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 2px;
  border-bottom: 1px solid var(--ln-on-deep);
  color: var(--c-night);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.5;
  transition: color .18s var(--ease), padding-left .18s var(--ease);
}

.page-about .ab-index a:hover,
.page-about .ab-index a:focus-visible {
  color: var(--c-cyan);
  padding-left: 8px;
  outline: none;
}

.page-about .ab-index a:focus-visible {
  box-shadow: 0 0 0 2px var(--c-deep), 0 0 0 4px var(--c-cyan);
  border-radius: 4px;
}

.page-about .ab-index__n {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-orange);
  flex: none;
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: var(--space-5) 0 0;
  padding: 0;
  list-style: none;
  background: var(--ln-on-deep);
  border: 1px solid var(--ln-on-deep);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .ab-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: rgba(11, 27, 51, .88);
}

.page-about .ab-hero__stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 700;
  color: var(--c-orange);
  line-height: 1;
}

.page-about .ab-hero__stat-label {
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--c-night);
  opacity: .78;
}

/* ---------- 通用展区 ---------- */
.page-about .ab-sec {
  position: relative;
  padding-block: clamp(56px, 7vw, 100px);
  background: var(--surface);
  color: var(--text);
}

.page-about .ab-sec::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 7px;
  background-image: repeating-linear-gradient(to right, var(--line) 0 1px, transparent 1px 18px);
  pointer-events: none;
}

.page-about .ab-sec--paper {
  --surface: var(--c-paper);
  --surface-alt: var(--c-cream);
  --text: var(--c-ink);
  --text-strong: var(--c-ink);
  --text-soft: rgba(16, 20, 24, .68);
  --line: var(--ln-on-paper);
  --row-alt: rgba(16, 20, 24, .04);
}

.page-about .ab-sec--cream {
  --surface: var(--c-cream);
  --surface-alt: var(--c-paper);
  --text: var(--c-ink);
  --text-strong: var(--c-ink);
  --text-soft: rgba(16, 20, 24, .68);
  --line: var(--ln-on-paper);
  --row-alt: rgba(16, 20, 24, .04);
}

.page-about .ab-sec--panel {
  --surface: var(--c-panel);
  --surface-alt: rgba(11, 27, 51, .78);
  --text: var(--c-night);
  --text-strong: #ffffff;
  --text-soft: rgba(199, 210, 224, .72);
  --line: var(--ln-on-deep);
  --row-alt: rgba(255, 255, 255, .05);
}

.page-about .ab-sec__inner {
  display: grid;
  gap: var(--space-4);
}

.page-about .ab-sec__aside {
  align-self: start;
}

.page-about .ab-sec__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 2.8vw, 36px);
  line-height: 1.26;
  letter-spacing: -.01em;
  color: var(--text-strong);
  margin: var(--space-2) 0 0;
  max-width: 16ch;
}

.page-about .ab-sec__body {
  min-width: 0;
  color: var(--text);
}

.page-about .ab-sec__body p {
  color: var(--text-soft);
  line-height: 1.78;
}

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  margin: 0 0 var(--space-4);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface-alt);
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-figure figcaption {
  padding: 12px 18px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-soft);
  border-top: 1px solid var(--line);
  background: var(--surface-alt);
}

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

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--line);
}

.page-about .ab-tl__item {
  position: relative;
  padding: 0 0 clamp(24px, 3vw, 34px) 4px;
  border-radius: var(--radius-sm);
}

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

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--surface);
  border: 2px solid var(--c-cyan);
  transition: background .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .ab-tl__item:hover::before,
.page-about .ab-tl__item:focus-within::before,
.page-about .ab-tl__item:focus-visible::before {
  background: var(--c-orange);
  border-color: var(--c-orange);
  transform: scale(1.18);
}

.page-about .ab-tl__item--current::before {
  background: var(--c-orange);
  border-color: var(--c-orange);
  box-shadow: 0 0 0 4px rgba(255, 92, 26, .2);
}

.page-about .ab-tl__item:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 6px;
}

.page-about .ab-tl__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--c-orange);
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  background: var(--c-orange-soft);
}

.page-about .ab-sec--panel .ab-tl__year {
  background: rgba(255, 92, 26, .16);
  color: #ffb98f;
}

.page-about .ab-tl__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 1.7vw, 21px);
  line-height: 1.42;
  color: var(--text-strong);
  margin: 10px 0 6px;
}

.page-about .ab-tl__desc {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--text-soft);
  max-width: 64ch;
}

.page-about .ab-tl__more {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height .32s var(--ease), opacity .32s var(--ease), margin-top .32s var(--ease);
}

.page-about .ab-tl__more p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--text-soft);
  padding-left: 14px;
  border-left: 2px solid var(--c-cyan);
  max-width: 62ch;
}

.page-about .ab-tl__item:hover .ab-tl__more,
.page-about .ab-tl__item:focus-within .ab-tl__more,
.page-about .ab-tl__item:focus-visible .ab-tl__more {
  max-height: 220px;
  opacity: 1;
  margin-top: 12px;
}

@media (hover: none) {
  .page-about .ab-tl__more {
    max-height: none;
    opacity: 1;
    margin-top: 12px;
  }
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-team__card {
  position: relative;
  padding: clamp(20px, 2.4vw, 28px);
  background: var(--surface-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  clip-path: polygon(0 0, calc(100% - var(--ab-cut)) 0, 100% var(--ab-cut), 100% 100%, 0 100%);
  transition: transform .22s var(--ease), box-shadow .22s var(--ease);
}

.page-about .ab-team__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 0 0 1px var(--c-cyan), var(--shadow-lift);
}

.page-about .ab-team__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--c-orange);
}

.page-about .ab-team__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.4;
  color: var(--text-strong);
  margin: 8px 0 10px;
}

.page-about .ab-team__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-soft);
}

/* ---------- 更新节奏 ---------- */
.page-about .ab-shift {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-shift__row {
  display: grid;
  gap: 6px;
  padding: 18px 4px;
  border-bottom: 1px solid var(--line);
  transition: background .2s var(--ease);
}

.page-about .ab-shift__row:hover {
  background: var(--row-alt);
}

.page-about .ab-shift__time {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13.5px;
  letter-spacing: .05em;
  color: var(--c-cyan);
  line-height: 1.6;
}

.page-about .ab-shift__what {
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-soft);
}

.page-about .ab-shift__note {
  margin: var(--space-3) 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-soft);
  padding-left: 16px;
  border-left: 2px solid var(--c-orange);
}

/* ---------- 跟队共建 ---------- */
.page-about .ab-fans {
  display: grid;
  gap: var(--space-3);
}

.page-about .ab-fans__item {
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-fans__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.45;
  color: var(--text-strong);
  margin: 0 0 8px;
}

.page-about .ab-fans__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-soft);
  max-width: 66ch;
}

/* ---------- 归档 ---------- */
.page-about .ab-arch {
  display: grid;
  gap: var(--space-4);
}

.page-about .ab-figure--tall {
  margin-bottom: 0;
}

.page-about .ab-figure--tall img {
  aspect-ratio: 5 / 7;
  object-fit: cover;
}

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

.page-about .ab-vers__item {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 10px;
  border-bottom: 1px solid var(--line);
  border-left: 2px solid transparent;
  transition: background .2s var(--ease), border-left-color .2s var(--ease);
}

.page-about .ab-vers__item:hover {
  background: var(--row-alt);
  border-left-color: var(--c-cyan);
}

.page-about .ab-vers__item:target {
  background: rgba(41, 224, 214, .12);
  border-left-color: var(--c-cyan);
}

.page-about .ab-vers__no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--c-cyan);
  line-height: 1.7;
}

.page-about .ab-vers__name {
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--text-strong);
  margin: 0 0 4px;
}

.page-about .ab-vers__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-soft);
}

.page-about .ab-arch__tabs {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: var(--space-3) 0 0;
  padding: 0;
}

.page-about .ab-chip {
  display: inline-block;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--text);
  text-decoration: none;
  transition: background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .ab-chip:hover,
.page-about .ab-chip:focus-visible {
  background: var(--c-cyan-soft);
  color: var(--c-ink);
  border-color: var(--c-cyan);
  outline: none;
}

.page-about .ab-arch__note {
  margin: var(--space-3) 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-soft);
  max-width: 66ch;
}

/* ---------- 合作 ---------- */
.page-about .ab-coop {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.page-about .ab-coop__row {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 16px;
  padding: 20px;
  background: var(--surface-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  transition: transform .22s var(--ease), box-shadow .22s var(--ease);
}

.page-about .ab-coop__row:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 0 1px var(--c-orange);
}

.page-about .ab-coop__no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 18px;
  font-weight: 700;
  color: var(--c-orange);
  line-height: 1.3;
}

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

.page-about .ab-coop__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.45;
  color: var(--text-strong);
  margin: 0 0 8px;
}

.page-about .ab-coop__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-soft);
}

/* ---------- 结尾条 ---------- */
.page-about .ab-cta {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-4);
  padding: clamp(22px, 3vw, 32px);
  border-radius: var(--radius-lg);
  background: var(--c-deep);
  color: var(--c-night);
  border: 1px solid rgba(41, 224, 214, .3);
  position: relative;
  overflow: hidden;
}

.page-about .ab-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(90% 140% at 100% 0%, rgba(255, 92, 26, .22), transparent 62%);
  pointer-events: none;
}

.page-about .ab-cta__text,
.page-about .ab-cta__acts {
  position: relative;
}

.page-about .ab-cta__line {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 1.9vw, 22px);
  line-height: 1.5;
  color: #ffffff;
}

.page-about .ab-cta__sub {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-night);
  opacity: .85;
}

.page-about .ab-cta__sub .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--c-cyan);
}

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

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

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

  .page-about .ab-team__card:nth-child(2) {
    transform: translateY(22px);
  }

  .page-about .ab-team__card:nth-child(2):hover {
    transform: translateY(18px);
  }

  .page-about .ab-shift__row {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }

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

  .page-about .ab-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: var(--space-4);
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .ab-hero__cols {
    grid-template-columns: minmax(0, 1.3fr) minmax(240px, .85fr);
    gap: var(--space-5);
    align-items: start;
  }

  .page-about .ab-sec__inner {
    grid-template-columns: 250px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 76px);
  }

  .page-about .ab-sec__aside {
    position: sticky;
    top: calc(var(--head-h) + 24px);
  }

  .page-about .ab-arch {
    grid-template-columns: minmax(220px, 300px) minmax(0, 1fr);
    gap: var(--space-5);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-team__card,
  .page-about .ab-coop__row,
  .page-about .ab-tl__item::before,
  .page-about .ab-index a,
  .page-about .ab-tl__more {
    transition: none;
  }

  .page-about .ab-team__card:hover,
  .page-about .ab-coop__row:hover {
    transform: none;
  }

  @media (min-width: 720px) {
    .page-about .ab-team__card:nth-child(2),
    .page-about .ab-team__card:nth-child(2):hover {
      transform: none;
    }
  }
}
<<<END>>>