.page-about {
  --ab-line: rgba(242, 231, 213, 0.16);
  --ab-line-soft: rgba(242, 231, 213, 0.08);
  --ab-cream-line: rgba(42, 33, 24, 0.18);
  --ab-gap: clamp(20px, 3.4vw, 42px);
  display: block;
  background: var(--ink);
  color: var(--cream);
}

/* ---------- 通用小节头 ---------- */
.page-about .ab-head {
  max-width: 44rem;
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .ab-head .section-title {
  margin: 10px 0 18px;
  line-height: 1.14;
}

.page-about .ab-head--dark {
  color: var(--cream-ink);
}

.page-about .ab-head--dark .kicker {
  color: var(--ember);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding-block: clamp(48px, 8vw, 116px) clamp(36px, 5vw, 64px);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 88%;
  background:
    radial-gradient(58% 70% at 78% 34%, rgba(245, 167, 59, 0.17), transparent 66%),
    radial-gradient(48% 62% at 6% 18%, rgba(120, 198, 219, 0.13), transparent 70%);
  pointer-events: none;
}

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

.page-about .ab-hero .breadcrumbs {
  margin-bottom: clamp(26px, 4vw, 46px);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--stone);
}

.page-about .ab-hero__title {
  margin: 12px 0 22px;
  margin-left: -0.05em;
  line-height: 1.02;
  letter-spacing: -0.025em;
  color: var(--cream);
}

.page-about .ab-hero__title br {
  display: none;
}

.page-about .ab-hero__lede {
  max-width: 36em;
  color: rgba(242, 231, 213, 0.82);
}

.page-about .ab-hero__scale {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: clamp(34px, 5vw, 60px);
  flex-wrap: wrap;
}

.page-about .ab-hero__scale-year {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--stone);
}

.page-about .ab-hero__scale-year--now {
  color: var(--gold);
}

.page-about .ab-hero__scale .trail {
  flex: 1 1 120px;
  min-width: 90px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.page-about .ab-hero__scale .trail__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: rgba(245, 167, 59, 0.28);
  transition: background 160ms var(--ease), box-shadow 160ms var(--ease);
}

.page-about .ab-hero__scale .trail__dot.is-lit {
  background: var(--gold);
  box-shadow: 0 0 12px rgba(245, 167, 59, 0.55);
}

/* ---------- 时间线 ---------- */
.page-about .ab-tl {
  padding-block: clamp(40px, 6vw, 84px);
}

.page-about .ab-tl__ribbon {
  margin: 0 0 clamp(34px, 5vw, 62px);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--ab-line);
}

.page-about .tl__item {
  position: relative;
  padding-left: 28px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .tl__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--gold);
  box-shadow: 0 0 0 4px rgba(245, 167, 59, 0.1);
  transition: border-color 200ms var(--ease), box-shadow 200ms var(--ease), background 200ms var(--ease);
}

.page-about .tl__item:nth-child(4)::after {
  border-color: var(--ember);
  box-shadow: 0 0 0 4px rgba(223, 90, 44, 0.14);
}

.page-about .tl__item:nth-child(5)::after {
  background: var(--gold);
  border-color: var(--gold);
  box-shadow: 0 0 0 5px rgba(245, 167, 59, 0.2);
}

.page-about .tl__mark {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about .tl__year {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .tl__ver {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--stone);
  border: 1px solid var(--ab-line);
  border-radius: 999px;
  padding: 2px 9px;
}

.page-about .tl__card {
  background: var(--panel);
  border: 1px solid var(--ab-line-soft);
  border-radius: var(--radius-m);
  padding: clamp(18px, 2.6vw, 26px);
  box-shadow: var(--shadow-1);
  transition: transform 220ms var(--ease), border-color 220ms var(--ease), box-shadow 220ms var(--ease);
}

.page-about .tl__card:hover,
.page-about .tl__card:focus-within {
  transform: translateY(-4px);
  border-color: rgba(245, 167, 59, 0.34);
  box-shadow: var(--shadow-2);
}

.page-about .tl__card-title {
  margin: 0 0 10px;
  font-size: clamp(1.05rem, 2.1vw, 1.28rem);
  font-weight: 800;
  line-height: 1.35;
  color: var(--gold-soft);
}

.page-about .tl__card p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.78;
  color: rgba(242, 231, 213, 0.76);
}

.page-about .tl__note {
  margin-top: 0 !important;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 0.84rem !important;
  color: var(--ice) !important;
  transition: max-height 260ms var(--ease), opacity 200ms var(--ease), margin-top 260ms var(--ease);
}

.page-about .tl__item:hover .tl__note,
.page-about .tl__item:focus-within .tl__note {
  max-height: 6rem;
  opacity: 1;
  margin-top: 12px !important;
}

/* ---------- 四类人群 ---------- */
.page-about .section--cream {
  color: var(--cream-ink);
  background: var(--cream);
}

.page-about .ab-crowd {
  padding-block: clamp(48px, 6.5vw, 96px);
}

.page-about .ab-crowd .prose p {
  color: rgba(42, 33, 24, 0.82);
}

.page-about .ab-crowd .prose strong {
  color: var(--cream-ink);
  font-weight: 800;
  border-bottom: 2px solid var(--ember);
  padding-bottom: 1px;
}

.page-about .ab-crowd .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-bottom: 18px;
  margin-bottom: clamp(24px, 3.4vw, 38px);
  border-bottom: 1px solid var(--ab-cream-line);
}

.page-about .ab-crowd .filter-btn {
  font: inherit;
  font-size: 13px;
  letter-spacing: 0.02em;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid rgba(42, 33, 24, 0.24);
  background: transparent;
  color: var(--cream-ink);
  cursor: pointer;
  transition: background 200ms var(--ease), color 200ms var(--ease), border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .ab-crowd .filter-btn:hover {
  transform: translateY(-2px);
  border-color: var(--ember);
}

.page-about .ab-crowd .filter-btn[aria-pressed="true"] {
  background: var(--cream-ink);
  color: var(--cream);
  border-color: var(--cream-ink);
}

.page-about .ab-crowd .filter-count {
  margin-left: auto;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(42, 33, 24, 0.6);
}

.page-about .ab-crowd__grid {
  gap: clamp(16px, 2.4vw, 26px);
}

.page-about .crowd {
  position: relative;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid var(--ab-cream-line);
  border-radius: var(--radius-l);
  padding: clamp(20px, 2.8vw, 30px);
  transition: transform 220ms var(--ease), box-shadow 220ms var(--ease), background 220ms var(--ease), opacity 240ms var(--ease);
}

.page-about .crowd:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 24px 48px -34px rgba(42, 33, 24, 0.7);
}

.page-about .crowd__num {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ember);
  margin: 0 0 12px;
}

.page-about .crowd .card__title {
  margin: 0 0 10px;
  font-size: 1.16rem;
  font-weight: 800;
  color: var(--cream-ink);
}

.page-about .crowd .card__body {
  margin: 0 0 14px;
  font-size: 0.95rem;
  line-height: 1.78;
  color: rgba(42, 33, 24, 0.78);
}

.page-about .crowd .card__meta {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(42, 33, 24, 0.55);
  border-top: 1px dashed var(--ab-cream-line);
  padding-top: 12px;
}

.page-about .crowd.is-filtered-out {
  display: none;
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  padding-block: clamp(48px, 6.5vw, 96px);
}

.page-about .ab-team__figure {
  margin: 0 0 clamp(30px, 4.4vw, 54px);
  border-radius: var(--radius-l);
  overflow: hidden;
}

.page-about .ab-team__grid {
  gap: clamp(18px, 2.6vw, 30px);
}

.page-about .ab-line {
  position: relative;
  padding: clamp(22px, 3vw, 34px);
  border-radius: var(--radius-m);
  background: linear-gradient(160deg, var(--panel) 0%, var(--panel-2) 100%);
  border: 1px solid var(--ab-line-soft);
  border-top: 3px solid var(--gold);
}

.page-about .ab-line:nth-child(2) {
  border-top-color: var(--ice);
}

.page-about .ab-line:nth-child(3) {
  border-top-color: var(--ember);
}

.page-about .ab-line__count {
  font-size: clamp(2rem, 4.6vw, 2.9rem);
  line-height: 1;
  color: var(--gold-soft);
  margin: 0 0 14px;
}

.page-about .ab-line__title {
  margin: 0 0 12px;
  font-size: 1.08rem;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--cream);
}

.page-about .ab-line p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.78;
  color: rgba(242, 231, 213, 0.74);
}

.page-about .ab-line__who {
  margin-top: 14px !important;
  padding-top: 12px;
  border-top: 1px solid var(--ab-line-soft);
  font-size: 0.84rem !important;
  color: var(--ice) !important;
}

/* ---------- 吉林本地 ---------- */
.page-about .ab-local {
  padding-block: clamp(48px, 6.5vw, 96px);
}

.page-about .ab-local__band {
  display: grid;
  gap: clamp(24px, 3.4vw, 40px);
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .ab-local__cities {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .ab-local__cities .tag--warm {
  font-size: 13px;
  letter-spacing: 0.03em;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(223, 90, 44, 0.12);
  color: #8a3417;
  border: 1px solid rgba(223, 90, 44, 0.28);
}

.page-about .ab-local__ways {
  display: grid;
  gap: clamp(18px, 2.6vw, 30px);
}

.page-about .ab-way {
  border-left: 3px solid var(--cream-ink);
  padding-left: clamp(16px, 2vw, 22px);
}

.page-about .ab-way__num {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ember);
}

.page-about .ab-way__title {
  margin: 0 0 10px;
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--cream-ink);
}

.page-about .ab-way p:last-child {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: rgba(42, 33, 24, 0.78);
}

.page-about .ab-local__figure {
  margin: 0 0 clamp(24px, 3.4vw, 36px);
  border-radius: var(--radius-l);
  overflow: hidden;
}

.page-about .ab-local__note {
  margin: 0;
  border-radius: var(--radius-m);
  padding: clamp(18px, 2.6vw, 24px);
  background: rgba(120, 198, 219, 0.16);
  border: 1px solid rgba(16, 50, 60, 0.16);
  color: #10323c;
}

.page-about .ab-local__note p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.78;
}

.page-about .ab-local__note .mono {
  font-weight: 700;
  letter-spacing: 0.06em;
}

/* ---------- 协作生态 ---------- */
.page-about .ab-eco {
  padding-block: clamp(48px, 6.5vw, 96px);
}

.page-about .ab-eco__grid {
  gap: clamp(18px, 2.6vw, 30px);
  margin-bottom: clamp(32px, 4.6vw, 56px);
}

.page-about .ab-eco__block {
  padding: clamp(22px, 3vw, 32px);
  border-radius: var(--radius-l);
  background: var(--panel);
  border: 1px solid var(--ab-line-soft);
}

.page-about .ab-eco__block--alt {
  background: linear-gradient(150deg, rgba(245, 167, 59, 0.14), rgba(23, 27, 36, 0.9) 62%);
  border-color: rgba(245, 167, 59, 0.3);
}

.page-about .ab-eco__lead {
  margin: 0 0 12px;
  font-size: clamp(1rem, 1.9vw, 1.14rem);
  font-weight: 800;
  line-height: 1.5;
  color: var(--gold-soft);
}

.page-about .ab-eco__block p:last-child {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: rgba(242, 231, 213, 0.76);
}

.page-about .ab-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line-soft);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .ab-facts .stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(18px, 2.6vw, 28px);
  background: var(--ink);
}

.page-about .ab-facts .stat__value {
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  line-height: 1;
  color: var(--gold);
  letter-spacing: 0.02em;
}

.page-about .ab-facts .stat__unit {
  font-size: 0.76rem;
  margin-left: 4px;
  color: var(--gold-soft);
  letter-spacing: 0.06em;
}

.page-about .ab-facts .stat__hint {
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--stone);
}

/* ---------- 下一步 ---------- */
.page-about .ab-next {
  padding-block: clamp(48px, 6.5vw, 92px);
}

.page-about .ab-next__list {
  display: grid;
  gap: 1px;
  background: var(--ab-line-soft);
  border-top: 1px solid var(--ab-line-soft);
  border-bottom: 1px solid var(--ab-line-soft);
}

.page-about .ab-next__item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(14px, 2.4vw, 26px);
  padding: clamp(20px, 2.8vw, 30px) clamp(4px, 1.4vw, 14px);
  background: var(--panel-2);
  text-decoration: none;
  color: inherit;
  transition: background 220ms var(--ease), padding-left 220ms var(--ease);
}

.page-about .ab-next__item:hover,
.page-about .ab-next__item:focus-visible {
  background: var(--panel);
  padding-left: clamp(12px, 2.4vw, 26px);
}

.page-about .ab-next__idx {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ember);
}

.page-about .ab-next__text {
  display: block;
}

.page-about .ab-next__label {
  display: block;
  font-size: clamp(1rem, 1.9vw, 1.14rem);
  font-weight: 800;
  color: var(--cream);
  margin-bottom: 6px;
}

.page-about .ab-next__desc {
  display: block;
  font-size: 0.92rem;
  line-height: 1.7;
  color: rgba(242, 231, 213, 0.7);
}

.page-about .ab-next__arrow {
  font-size: 1.1rem;
  color: var(--gold);
  transition: transform 220ms var(--ease);
}

.page-about .ab-next__item:hover .ab-next__arrow {
  transform: translateX(6px);
}

.page-about .ab-next__more {
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  font-size: 0.92rem;
  color: rgba(242, 231, 213, 0.66);
}

.page-about .ab-next__more a {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid rgba(120, 198, 219, 0.4);
  padding-bottom: 1px;
}

.page-about .ab-next__more a:hover {
  color: var(--gold-soft);
  border-bottom-color: rgba(255, 215, 154, 0.6);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-hero__title br {
    display: inline;
  }

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

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

@media (min-width: 900px) {
  .page-about .tl::before {
    left: 111px;
    top: 12px;
    bottom: 12px;
  }

  .page-about .tl__item {
    grid-template-columns: 100px minmax(0, 1fr);
    column-gap: 24px;
    padding-left: 0;
    row-gap: 0;
    align-items: start;
  }

  .page-about .tl__item::after {
    left: 106px;
    top: 10px;
  }

  .page-about .tl__mark {
    justify-content: flex-end;
    text-align: right;
    padding-top: 4px;
    flex-wrap: wrap;
    gap: 6px;
  }

  .page-about .tl__item:nth-child(even) .tl__card {
    margin-left: clamp(16px, 3vw, 48px);
  }

  .page-about .tl__item:nth-child(3n) .tl__card {
    margin-right: clamp(12px, 2vw, 36px);
  }

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

  .page-about .ab-local__band {
    grid-template-columns: 1fr;
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-hero__lede {
    max-width: 34em;
  }

  .page-about .tl__item {
    grid-template-columns: 120px minmax(0, 1fr);
    column-gap: 30px;
  }

  .page-about .tl::before {
    left: 133px;
  }

  .page-about .tl__item::after {
    left: 128px;
  }
}

@media (max-width: 719px) {
  .page-about .tl__note {
    max-height: none;
    opacity: 1;
    margin-top: 12px !important;
  }

  .page-about .tl__card:hover,
  .page-about .tl__card:focus-within {
    transform: none;
  }

  .page-about .ab-crowd .filter-count {
    margin-left: 0;
    width: 100%;
  }

  .page-about .ab-next__item {
    grid-template-columns: auto 1fr;
    row-gap: 10px;
  }

  .page-about .ab-next__arrow {
    grid-column: 2;
    justify-self: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__card,
  .page-about .crowd,
  .page-about .ab-next__item,
  .page-about .ab-next__arrow,
  .page-about .trail__dot {
    transition: opacity 200ms linear;
  }

  .page-about .tl__card:hover,
  .page-about .crowd:hover {
    transform: none;
  }

  .page-about .ab-next__item:hover .ab-next__arrow {
    transform: none;
  }
}