.page-about {
  --ab-gap: clamp(28px, 4.4vw, 64px);
  --ab-hair: 1px solid var(--grid);
  background: var(--deep);
  color: var(--cream);
}

.page-about [id^="ab-0"] {
  scroll-margin-top: 84px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: clamp(480px, 76vh, 720px);
  overflow: hidden;
  border-bottom: var(--ab-hair);
  background: var(--deep);
}

.page-about .ab-hero__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
  filter: saturate(0.72) contrast(1.06);
}

.page-about .ab-hero__veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(6, 20, 38, 0.5) 0%, rgba(6, 20, 38, 0.84) 52%, var(--deep) 100%),
    repeating-linear-gradient(180deg, rgba(29, 58, 86, 0.55) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(90deg, rgba(29, 58, 86, 0.35) 0 1px, transparent 1px 96px);
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
  width: 100%;
  padding-top: clamp(76px, 13vw, 148px);
  padding-bottom: clamp(38px, 6vw, 62px);
}

.page-about .ab-hero__kicker {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .ab-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-title);
  font-weight: 600;
  font-size: clamp(36px, 8vw, 78px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--cream);
}

.page-about .ab-hero__title em {
  display: block;
  margin-top: 6px;
  font-style: normal;
  color: var(--cyan);
  font-size: 0.62em;
  letter-spacing: 0;
}

.page-about .ab-hero__lede {
  max-width: 42ch;
  margin: clamp(20px, 3vw, 30px) 0 0;
  color: var(--mist);
}

.page-about .ab-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 档案目录 ---------- */
.page-about .ab-dir {
  padding: clamp(34px, 5vw, 58px) 0 clamp(30px, 4.6vw, 54px);
  background: var(--deep);
}

.page-about .ab-dir__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 18px;
  margin-bottom: clamp(18px, 2.6vw, 28px);
}

.page-about .ab-dir__eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cold);
}

.page-about .ab-dir__title {
  margin: 0;
  font-family: var(--font-title);
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .ab-dir__sub {
  margin: 0;
  font-size: 14px;
  color: var(--mist);
}

.page-about .ab-dir__list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--grid);
  border: var(--ab-hair);
}

.page-about .ab-dir__item a {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num name"
    "num desc";
  column-gap: 16px;
  row-gap: 4px;
  height: 100%;
  padding: 18px 20px;
  background: var(--navy);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: background 0.14s var(--ease), border-color 0.14s var(--ease);
}

.page-about .ab-dir__item a:hover,
.page-about .ab-dir__item a:focus-visible {
  background: var(--panel);
  border-left-color: var(--cyan);
}

.page-about .ab-dir__num {
  grid-area: num;
  align-self: start;
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .ab-dir__name {
  grid-area: name;
  font-family: var(--font-title);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--cream);
}

.page-about .ab-dir__desc {
  grid-area: desc;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 通用小节头 ---------- */
.page-about .ab-wall-sec__intro,
.page-about .ab-cols__intro {
  max-width: 46ch;
  margin: clamp(18px, 2.6vw, 26px) 0 clamp(28px, 4vw, 46px);
  color: var(--mist);
}

/* ---------- 编年档案墙 ---------- */
.page-about .ab-wall {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-wall::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 26px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--grid) 22%, var(--grid) 82%, transparent 100%);
}

.page-about .ab-wall__item {
  position: relative;
  padding-left: 40px;
  padding-bottom: clamp(26px, 3.8vw, 42px);
}

.page-about .ab-wall__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--deep);
  border: 2px solid var(--cyan);
  transition: background 0.16s var(--ease), box-shadow 0.16s var(--ease);
}

.page-about .ab-wall__item:hover::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(47, 227, 208, 0.14);
}

.page-about .ab-wall__year {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.12em;
  background: var(--orange);
  color: var(--deep);
}

.page-about .ab-wall__title {
  margin: 0 0 8px;
  font-family: var(--font-title);
  font-size: clamp(19px, 2.6vw, 24px);
  font-weight: 600;
  color: var(--cream);
}

.page-about .ab-wall__text {
  max-width: 54ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .ab-wall__aside {
  max-height: 0;
  margin: 0;
  overflow: hidden;
  opacity: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  transition: opacity 0.18s var(--ease), max-height 0.18s var(--ease), margin 0.18s var(--ease);
}

.page-about .ab-wall__item:hover .ab-wall__aside,
.page-about .ab-wall__item:focus-within .ab-wall__aside {
  max-height: 48px;
  margin-top: 8px;
  opacity: 1;
}

@media (hover: none) {
  .page-about .ab-wall__aside {
    max-height: 48px;
    margin-top: 8px;
    opacity: 1;
  }
}

/* ---------- 团队与核对 ---------- */
.page-about .ab-team__grid {
  display: grid;
  gap: clamp(24px, 3.6vw, 44px);
  margin-top: clamp(18px, 2.6vw, 28px);
}

.page-about .ab-team__copy .prose + .prose {
  margin-top: 16px;
}

.page-about .ab-team__fig {
  margin: 0;
  border: var(--ab-hair);
  background: var(--navy);
}

.page-about .ab-team__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  opacity: 0.86;
}

.page-about .ab-team__fig .figure__cap {
  padding: 12px 16px;
  border-top: var(--ab-hair);
  color: var(--mist);
}

.page-about .ab-city {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 28px);
  padding: 14px 18px;
  border: var(--ab-hair);
  border-left: 3px solid var(--orange);
  background: var(--navy);
}

.page-about .ab-city__art {
  flex: none;
  width: 96px;
  height: 32px;
  fill: none;
  stroke: var(--cold);
  stroke-width: 1.4;
  stroke-linejoin: round;
}

.page-about .ab-city__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--grid);
  border: var(--ab-hair);
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  background: var(--panel);
}

.page-about .ab-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1;
  color: var(--orange);
}

.page-about .ab-stat__label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--mist);
}

.page-about .ab-plaque {
  margin-top: clamp(26px, 3.6vw, 40px);
  padding: 0;
  overflow: hidden;
}

.page-about .ab-plaque > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 20px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-title);
  font-size: 17px;
  font-weight: 600;
  color: var(--deep);
}

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

.page-about .ab-plaque > summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--orange-d);
}

.page-about .ab-plaque[open] > summary::after {
  content: "–";
}

.page-about .ab-plaque__body {
  padding: 0 20px 20px;
}

.page-about .ab-plaque__body p {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--deep);
}

/* ---------- 栏目体系 ---------- */
.page-about .ab-seg {
  position: relative;
}

.page-about .ab-seg__input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .ab-seg__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  background: var(--grid);
  border: var(--ab-hair);
}

.page-about .ab-seg__tab {
  flex: 1 1 130px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  cursor: pointer;
  background: var(--navy);
  font-family: var(--font-title);
  font-size: 16px;
  letter-spacing: 0.01em;
  color: var(--mist);
  transition: background 0.16s var(--ease), color 0.16s var(--ease);
}

.page-about .ab-seg__tab:hover {
  color: var(--cream);
}

.page-about .ab-seg__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cold);
}

.page-about #ab-col-1:checked ~ .ab-seg__tabs label[for="ab-col-1"],
.page-about #ab-col-2:checked ~ .ab-seg__tabs label[for="ab-col-2"],
.page-about #ab-col-3:checked ~ .ab-seg__tabs label[for="ab-col-3"] {
  background: var(--panel);
  color: var(--cyan);
  box-shadow: inset 0 -3px 0 var(--cyan);
}

.page-about #ab-col-1:checked ~ .ab-seg__tabs label[for="ab-col-1"] .ab-seg__idx,
.page-about #ab-col-2:checked ~ .ab-seg__tabs label[for="ab-col-2"] .ab-seg__idx,
.page-about #ab-col-3:checked ~ .ab-seg__tabs label[for="ab-col-3"] .ab-seg__idx {
  color: var(--orange);
}

.page-about #ab-col-1:focus-visible ~ .ab-seg__tabs label[for="ab-col-1"],
.page-about #ab-col-2:focus-visible ~ .ab-seg__tabs label[for="ab-col-2"],
.page-about #ab-col-3:focus-visible ~ .ab-seg__tabs label[for="ab-col-3"] {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .ab-seg__panels {
  border: var(--ab-hair);
  border-top: none;
  background: var(--navy);
}

.page-about .ab-seg__panel {
  display: none;
  padding: clamp(22px, 3.4vw, 38px);
  animation: ab-fade 0.18s var(--ease);
}

.page-about #ab-col-1:checked ~ .ab-seg__panels .ab-seg__panel[data-panel="1"],
.page-about #ab-col-2:checked ~ .ab-seg__panels .ab-seg__panel[data-panel="2"],
.page-about #ab-col-3:checked ~ .ab-seg__panels .ab-seg__panel[data-panel="3"] {
  display: block;
}

@keyframes ab-fade {
  from { opacity: 0; }
  to { opacity: 1; }
}

.page-about .ab-seg__head {
  margin: 0 0 14px;
  font-family: var(--font-title);
  font-size: clamp(20px, 3vw, 27px);
  font-weight: 600;
  color: var(--cream);
}

.page-about .ab-seg__panel p {
  max-width: 52ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .ab-seg__list {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--ab-hair);
}

.page-about .ab-seg__list li {
  position: relative;
  padding: 11px 0 11px 22px;
  border-bottom: var(--ab-hair);
  font-size: 15px;
  color: var(--cream);
}

.page-about .ab-seg__list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 19px;
  width: 8px;
  height: 1px;
  background: var(--cyan);
}

.page-about .ab-seg__go {
  margin-top: 22px;
}

/* ---------- 来源标注 ---------- */
.page-about .ab-src__grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(18px, 2.6vw, 28px);
  background: var(--grid);
  border: var(--ab-hair);
}

.page-about .ab-src__panel {
  padding: clamp(20px, 3vw, 30px);
  border: none;
}

.page-about .ab-src__head {
  margin: 0 0 12px;
  font-family: var(--font-title);
  font-size: 19px;
  font-weight: 600;
  color: var(--cyan);
}

.page-about .ab-src__panel p {
  margin: 0;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .ab-src__foot {
  max-width: 62ch;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding-left: 18px;
  border-left: 3px solid var(--orange);
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .ab-src__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 227, 208, 0.4);
}

.page-about .ab-src__foot a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 长期跟随 ---------- */
.page-about .ab-follow__grid {
  display: grid;
  gap: clamp(24px, 3.6vw, 44px);
  margin-top: clamp(18px, 2.6vw, 28px);
}

.page-about .ab-follow__fig {
  margin: 0;
  border: var(--ab-hair);
  background: var(--navy);
}

.page-about .ab-follow__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 6;
  object-fit: cover;
  opacity: 0.84;
}

.page-about .ab-follow__fig .figure__cap {
  padding: 12px 16px;
  border-top: var(--ab-hair);
  color: var(--mist);
}

.page-about .ab-follow__copy .prose + .prose {
  margin-top: 16px;
}

.page-about .ab-follow__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-follow__strip {
  margin-top: clamp(26px, 3.6vw, 40px);
  border-top: var(--ab-hair);
  border-bottom: var(--ab-hair);
}

.page-about .ab-follow__strip .date-strip__item {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

/* ---------- 结语 ---------- */
.page-about .ab-coda {
  padding: clamp(64px, 12vw, 140px) 0 clamp(52px, 9vw, 110px);
  border-top: var(--ab-hair);
  background: linear-gradient(180deg, var(--deep) 0%, var(--navy) 100%);
}

.page-about .ab-coda__inner {
  text-align: left;
}

.page-about .ab-coda__line {
  max-width: 20ch;
  margin: 0;
  font-family: var(--font-title);
  font-size: clamp(28px, 6vw, 56px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--cream);
}

.page-about .ab-coda__line span {
  display: block;
  color: var(--cyan);
}

.page-about .ab-coda__sign {
  margin: clamp(24px, 3.6vw, 38px) 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .ab-coda__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: clamp(22px, 3vw, 32px) 0 0;
}

.page-about .ab-coda__links a {
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.14s var(--ease), border-color 0.14s var(--ease);
}

.page-about .ab-coda__links a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .ab-dir__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 1000px) {
  .page-about .ab-hero__inner {
    padding-right: clamp(0px, 4vw, 90px);
  }

  .page-about .ab-dir__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .ab-team__fig {
    margin-top: 8px;
    transform: translateX(clamp(0px, 2vw, 34px));
  }

  .page-about .ab-follow__grid {
    grid-template-columns: minmax(0, 0.62fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-wall__item {
    display: grid;
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 0 28px;
    padding-left: 46px;
  }

  .page-about .ab-wall__year {
    margin-bottom: 0;
    align-self: start;
    text-align: center;
  }
}

@media (min-width: 1280px) {
  .page-about .ab-wall::before {
    left: 7px;
  }
}
<<<END>>>