.page-about {
  --ab-gap: clamp(56px, 8vw, 118px);
  --ab-cyan-soft: rgba(53, 240, 220, 0.22);
  background: var(--void);
  color: var(--ink);
  overflow-x: clip;
}

.page-about .sec {
  padding: var(--ab-gap) 0;
}

.page-about .sec--tight {
  padding: clamp(40px, 5vw, 72px) 0 clamp(48px, 6vw, 88px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(28px, 4vw, 52px) 0 var(--ab-gap);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .ab-hero__title {
  margin: 18px 0 0;
  font-size: clamp(34px, 9.4vw, 112px);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.02em;
}

.page-about .ab-hero__lede {
  margin: 24px 0 0;
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .ab-hero__side {
  padding-top: 4px;
}

.page-about .ab-vnote {
  margin: 0 0 20px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--index);
  text-transform: uppercase;
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 24px;
  margin: 0;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.page-about .ab-stats__item dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .ab-stats__item dd {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 8px 0 0;
  font-family: var(--mono);
  font-size: clamp(28px, 5vw, 42px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-stats__unit {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 区块头 ---------- */
.page-about .ab-sec-head {
  max-width: 74ch;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .ab-sec-head .sec-title {
  margin: 14px 0 0;
}

.page-about .ab-sec-head .sec-lede {
  margin: 18px 0 0;
}

/* ---------- 团队与班次 ---------- */
.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .ab-team__body .sec-title {
  margin: 14px 0 0;
}

.page-about .ab-team__text {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .ab-shifts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 32px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-shift {
  background: var(--panel);
  padding: 24px 22px 26px;
}

.page-about .ab-shift__time {
  margin: 0;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .ab-shift__name {
  margin: 10px 0 0;
  font-size: 18px;
  font-weight: 700;
}

.page-about .ab-shift__list {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-shift__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .ab-shift__list li + li {
  margin-top: 6px;
}

.page-about .ab-shift__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 1px;
  background: var(--cyan);
}

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

/* ---------- 采编链路 ---------- */
.page-about .ab-flow__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-flow__step {
  background: var(--void);
  padding: 26px 20px 30px;
}

.page-about .ab-flow__idx {
  display: block;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .ab-flow__step h3 {
  margin: 14px 0 0;
  font-size: 18px;
  font-weight: 700;
}

.page-about .ab-flow__step p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-tl {
  position: relative;
  margin: 0;
  padding: 6px 0 6px 30px;
  list-style: none;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--cyan-soft) 22%, var(--line) 60%, var(--line) 100%);
}

.page-about .ab-tl__node {
  position: relative;
  padding-bottom: 22px;
}

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

.page-about .ab-tl__node::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 16px;
  width: 11px;
  height: 11px;
  background: var(--void);
  border: 1px solid var(--cyan);
  transition: background 0.24s var(--ease);
}

.page-about .ab-tl__box {
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .ab-tl__box[open] {
  border-color: var(--ab-cyan-soft);
  background: linear-gradient(180deg, var(--indigo) 0%, var(--panel) 78%);
}

.page-about .ab-tl__box[open] .ab-tl__node::before,
.page-about .ab-tl__node:has(.ab-tl__box[open])::before {
  background: var(--cyan);
}

.page-about .ab-tl__box summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  padding: 20px 22px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-tl__box summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--mono);
  font-size: 18px;
  line-height: 1;
  color: var(--orange);
}

.page-about .ab-tl__box[open] summary::after {
  content: "–";
  color: var(--cyan);
}

.page-about .ab-tl__year {
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .ab-tl__name {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .ab-tl__body {
  padding: 0 22px 22px;
}

.page-about .ab-tl__body p {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 资料库 ---------- */
.page-about .ab-archive {
  background: var(--archive);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-archive__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .ab-archive__media {
  margin: 0;
}

.page-about .ab-archive__body .sec-title {
  margin: 14px 0 0;
}

.page-about .ab-archive__text {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: rgba(239, 241, 250, 0.78);
}

.page-about .ab-levels {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 32px;
  background: rgba(53, 240, 220, 0.16);
  border: 1px solid rgba(53, 240, 220, 0.16);
}

.page-about .ab-level {
  padding: 22px 20px 24px;
  background: var(--archive);
}

.page-about .ab-level__idx {
  display: block;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .ab-level h3 {
  margin: 10px 0 0;
  font-size: 17px;
  font-weight: 700;
}

.page-about .ab-level p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(239, 241, 250, 0.68);
}

.page-about .ab-cloud__title {
  margin: 36px 0 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .ab-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-cloud li {
  padding: 6px 11px;
  border: 1px solid rgba(53, 240, 220, 0.2);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: rgba(239, 241, 250, 0.82);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .ab-cloud li.is-md {
  font-size: 15px;
  border-color: rgba(53, 240, 220, 0.42);
  color: var(--ink);
}

.page-about .ab-cloud li.is-lg {
  padding: 9px 15px;
  font-size: 17px;
  font-weight: 700;
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .ab-cloud li:hover {
  background: rgba(53, 240, 220, 0.14);
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .ab-archive__foot {
  margin: 26px 0 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .ab-archive__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--ab-cyan-soft);
}

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

/* ---------- 合作与互认 ---------- */
.page-about .ab-partner {
  background: var(--void);
}

.page-about .ab-partner__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: start;
}

.page-about .ab-partner__intro .sec-title {
  margin: 14px 0 0;
}

.page-about .ab-partner__intro p {
  margin: 20px 0 0;
  max-width: 60ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--muted);
}

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

.page-about .ab-partner__num {
  padding: 22px 20px;
  background: var(--indigo);
}

.page-about .ab-partner__num dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(239, 241, 250, 0.6);
}

.page-about .ab-partner__num dd {
  margin: 12px 0 0;
  font-size: 15px;
  color: var(--ink);
}

.page-about .ab-partner__num dd .num {
  font-family: var(--mono);
  font-size: clamp(24px, 4vw, 34px);
  color: var(--orange);
  vertical-align: -0.08em;
}

/* ---------- 运营主体 ---------- */
.page-about .ab-operator {
  background: var(--panel);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-operator__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .ab-operator__body .sec-title {
  margin: 14px 0 0;
}

.page-about .ab-operator__body > p {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .ab-op-list {
  margin: 32px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-op-list__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-op-list__row dt {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .ab-op-list__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .ab-op-list__row dd.num {
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

.page-about .ab-op-list__row a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--ab-cyan-soft);
}

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

.page-about .ab-operator__media {
  margin: 0;
}

/* ---------- 后续索引 ---------- */
.page-about .ab-next__title {
  margin: 14px 0 0;
}

.page-about .ab-next__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-next__list a {
  display: block;
  padding: 22px 20px;
  background: var(--void);
  color: var(--ink);
  text-decoration: none;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .ab-next__list a:hover,
.page-about .ab-next__list a:focus-visible {
  background: var(--indigo);
}

.page-about .ab-next__name {
  display: block;
  font-size: 18px;
  font-weight: 700;
}

.page-about .ab-next__desc {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .ab-next__list a:hover .ab-next__desc,
.page-about .ab-next__list a:focus-visible .ab-next__desc {
  color: rgba(239, 241, 250, 0.82);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-levels {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-shifts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-op-list__row {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }

  .page-about .ab-next__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-flow__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: 8fr 3fr;
    gap: clamp(40px, 5vw, 72px);
    align-items: end;
  }

  .page-about .ab-hero__side {
    padding-left: 28px;
    border-left: 1px solid var(--line);
  }

  .page-about .ab-vnote {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    margin: 0 0 28px auto;
    width: 1em;
    letter-spacing: 0.28em;
  }

  .page-about .ab-team__grid {
    grid-template-columns: 6fr 5fr;
    gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }

  .page-about .ab-archive__grid {
    grid-template-columns: 5fr 7fr;
    gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }

  .page-about .ab-partner__grid {
    grid-template-columns: 7fr 5fr;
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .ab-operator__grid {
    grid-template-columns: 7fr 5fr;
    gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }

  .page-about .ab-tl {
    padding-left: 34px;
  }

  .page-about .ab-tl__node::before {
    left: -34px;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-flow__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-flow__step {
    padding: 30px 24px 34px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-cloud li,
  .page-about .ab-next__list a,
  .page-about .ab-tl__box,
  .page-about .ab-tl__node::before {
    transition: none;
  }
}

.page-about {
  --cyan-soft: transparent;
}