.page-about {
  --ab-soft: rgba(195, 154, 43, 0.14);
  --ab-soft-green: rgba(79, 125, 105, 0.09);
  --ab-radius: var(--r-md);
  --ab-gap: clamp(1.4rem, 4vw, 3rem);

  background:
    radial-gradient(118% 58% at 88% -8%, var(--ab-soft), transparent 62%),
    radial-gradient(86% 48% at 2% 8%, var(--ab-soft-green), transparent 58%),
    var(--paper-100);
  color: var(--ink-900);
  font-family: var(--font-body);
}

.page-about .is-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding-top: clamp(1.4rem, 4vw, 2.4rem);
  padding-bottom: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ab-gap);
  align-items: end;
  margin-top: clamp(1.2rem, 3vw, 2rem);
}

.page-about .ab-hero__h1 {
  margin: 0.5rem 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2.1rem, 6.2vw, 4.1rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--ink-900);
  text-shadow: 1px 0 0 rgba(228, 104, 28, 0.22);
  max-width: 20em;
}

.page-about .ab-hero__lead {
  display: flex;
  flex-direction: column;
}

.page-about .ab-hero__lead .yw-lead {
  margin-top: 1.1rem;
  max-width: 40em;
  color: var(--ink-700);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.5rem;
}

.page-about .ab-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line-300);
  border-radius: var(--ab-radius);
  overflow: hidden;
  box-shadow: var(--shadow-1);
}

.page-about .ab-figures__item {
  background: var(--paper-200);
  padding: 1rem 1.05rem 1.1rem;
  transition: background var(--dur) var(--ease);
}

.page-about .ab-figures__item:hover {
  background: var(--sand-200);
}

.page-about .ab-figures__item dt {
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--ink-700);
  opacity: 0.78;
}

.page-about .ab-figures__item dd {
  margin: 0.3rem 0 0;
  display: flex;
  align-items: baseline;
  gap: 0.24rem;
}

.page-about .ab-figures__n {
  font-size: clamp(1.5rem, 4.6vw, 2.1rem);
  font-weight: 700;
  color: var(--ink-900);
  line-height: 1;
}

.page-about .ab-figures__item:nth-child(2) .ab-figures__n,
.page-about .ab-figures__item:nth-child(4) .ab-figures__n {
  color: var(--orange-500);
}

.page-about .ab-figures__unit {
  font-size: 0.82rem;
  color: var(--ink-700);
  opacity: 0.8;
}

/* ---------- 章节跳转 ---------- */
.page-about .ab-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: clamp(1.6rem, 4vw, 2.6rem);
  padding-top: 1rem;
  border-top: 2px solid var(--sand-200);
}

.page-about .ab-jump__link {
  display: inline-block;
  padding: 0.4rem 0.78rem;
  border-radius: var(--r-full);
  background: var(--paper-200);
  color: var(--ink-700);
  font-size: 0.85rem;
  text-decoration: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .ab-jump__link:hover,
.page-about .ab-jump__link:focus-visible {
  background: var(--orange-500);
  color: var(--paper-100);
  transform: translateY(-2px);
}

.page-about .ab-jump__link[aria-current] {
  background: var(--ink-900);
  color: var(--sand-200);
}

/* ---------- 通用章节 ---------- */
.page-about .ab-section {
  padding-top: clamp(2.4rem, 6vw, 4.2rem);
  padding-bottom: clamp(2.4rem, 6vw, 4.2rem);
}

.page-about .ab-section--sand {
  background: linear-gradient(180deg, var(--paper-200), var(--paper-100) 78%);
}

.page-about .ab-section--ink {
  background: var(--ink-900);
  color: var(--paper-100);
}

.page-about .ab-section--ink .yw-chapter__num {
  color: var(--sand-200);
}

.page-about .yw-chapter--onDark .yw-chapter__title {
  color: var(--paper-100);
  text-shadow: 1px 0 0 rgba(228, 104, 28, 0.4);
}

.page-about .yw-chapter--onDark .yw-chapter__desc {
  color: var(--paper-200);
  opacity: 0.82;
}

/* ---------- 左右分栏 ---------- */
.page-about .ab-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ab-gap);
  align-items: center;
  margin-top: clamp(1.4rem, 3.4vw, 2.2rem);
}

.page-about .ab-split__text .yw-prose {
  margin: 0;
}

.page-about .ab-quote {
  margin: 0.4rem 0 0;
  padding-left: 1rem;
  border-left: 4px solid var(--orange-500);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.15rem, 3.4vw, 1.5rem);
  line-height: 1.5;
  color: var(--ink-900);
}

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  margin: 0;
}

.page-about .ab-figure__frame {
  position: relative;
  border-radius: var(--ab-radius);
  overflow: hidden;
  background: linear-gradient(150deg, var(--paper-200), var(--sand-200));
  box-shadow: var(--shadow-2);
}

.page-about .ab-figure__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(14, 26, 43, 0.1);
  border-radius: inherit;
  pointer-events: none;
}

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

.page-about .ab-figure__frame--wide img {
  aspect-ratio: 2 / 1;
}

.page-about .ab-figure__cap {
  margin-top: 0.7rem;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--ink-700);
  opacity: 0.82;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-tl-wrap {
  margin-top: clamp(1.4rem, 3.4vw, 2.2rem);
}

.page-about .ab-tl {
  display: flex;
  gap: 0.9rem;
  margin: 0;
  padding: 1.6rem 0.2rem 0.8rem;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  border-top: 2px solid var(--sand-200);
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-tl__item {
  position: relative;
  flex: 0 0 clamp(218px, 74vw, 274px);
  scroll-snap-align: start;
  padding: 1.5rem 1.15rem 1.2rem;
  background: var(--paper-100);
  border-radius: var(--ab-radius);
  box-shadow: var(--shadow-1);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  top: -25px;
  left: 1.15rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--sand-500);
  box-shadow: 0 0 0 4px rgba(195, 154, 43, 0.2);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .ab-tl__item:hover,
.page-about .ab-tl__item:focus-within {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
  background: var(--paper-200);
}

.page-about .ab-tl__item:hover::before,
.page-about .ab-tl__item:focus-within::before {
  background: var(--orange-500);
  box-shadow: 0 0 0 6px rgba(228, 104, 28, 0.16);
}

.page-about .ab-tl__year {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--orange-500);
  line-height: 1;
}

.page-about .ab-tl__title {
  margin: 0.55rem 0 0.4rem;
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--ink-900);
}

.page-about .ab-tl__desc {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--ink-700);
}

.page-about .ab-tl__more {
  margin: 0.55rem 0 0;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--celadon-500);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease), margin var(--dur) var(--ease);
}

.page-about .ab-tl__item:hover .ab-tl__more,
.page-about .ab-tl__item:focus-within .ab-tl__more {
  max-height: 8em;
  opacity: 1;
}

@media (hover: none) {
  .page-about .ab-tl__more {
    max-height: 8em;
    opacity: 1;
  }
}

/* ---------- 覆盖城市 ---------- */
.page-about .ab-cities {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ab-gap);
  align-items: center;
  margin-top: clamp(1.8rem, 4.4vw, 3rem);
}

.page-about .ab-cities__heading {
  margin: 0 0 0.75rem;
  font-size: clamp(1.2rem, 3.6vw, 1.6rem);
  font-weight: 900;
  color: var(--ink-900);
  text-shadow: 1px 0 0 rgba(195, 154, 43, 0.3);
}

.page-about .ab-cities__text .yw-prose {
  margin: 0 0 0.85rem;
}

.page-about .ab-cities__text .yw-btn {
  margin-top: 0.5rem;
}

/* ---------- 团队 ---------- */
.page-about .yw-note {
  margin-top: 0.6rem;
  color: var(--ink-900);
}

/* ---------- 流程 ---------- */
.page-about .ab-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(1.4rem, 3.4vw, 2.2rem) 0 0;
  padding: 0;
  list-style: none;
  background: rgba(199, 188, 168, 0.28);
  border-radius: var(--ab-radius);
  overflow: hidden;
}

.page-about .ab-flow__step {
  background: var(--ink-700);
  padding: 1.35rem 1.2rem 1.4rem;
  transition: background var(--dur) var(--ease);
}

.page-about .ab-flow__step:hover {
  background: var(--ink-900);
}

.page-about .ab-flow__num {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--sand-500);
  line-height: 1;
}

.page-about .ab-flow__title {
  margin: 0.6rem 0 0.45rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--paper-100);
}

.page-about .ab-flow__desc {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: rgba(245, 239, 227, 0.78);
}

.page-about .ab-flow__foot {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
  margin-top: clamp(1.4rem, 3.4vw, 2.2rem);
}

.page-about .ab-flow__stat {
  display: flex;
  flex-direction: column;
  gap: 0.24rem;
  padding: 1rem 1.1rem;
  background: rgba(245, 239, 227, 0.06);
  border-left: 3px solid var(--orange-500);
  border-radius: var(--r-sm);
}

.page-about .ab-flow__statnum {
  font-size: clamp(1.5rem, 4.4vw, 2rem);
  font-weight: 700;
  color: var(--orange-300);
  line-height: 1;
}

.page-about .ab-flow__statlabel {
  font-size: 0.85rem;
  line-height: 1.6;
  color: rgba(245, 239, 227, 0.72);
}

.page-about .ab-flow__note {
  margin: 1.4rem 0 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: rgba(245, 239, 227, 0.68);
}

/* ---------- 合作方 ---------- */
.page-about .ab-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.4rem;
}

.page-about .ab-partners__body .yw-prose {
  margin: 0 0 0.9rem;
}

.page-about .ab-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 1.1rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .yw-badge {
  font-size: 0.85rem;
}

.page-about .ab-partners__cta {
  margin: 1.4rem 0 0;
  font-size: 0.95rem;
  color: var(--ink-700);
}

.page-about .ab-partners__cta a {
  color: var(--orange-500);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--sand-200);
  padding-bottom: 1px;
}

.page-about .ab-partners__cta a:hover,
.page-about .ab-partners__cta a:focus-visible {
  border-bottom-color: var(--orange-500);
}

/* ---------- 观察 ---------- */
.page-about .ab-observe {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ab-gap);
  margin-top: clamp(1.4rem, 3.4vw, 2.2rem);
}

.page-about .ab-observe__book {
  padding: clamp(1.4rem, 3.6vw, 2.2rem);
  background: var(--paper-200);
  border-radius: var(--ab-radius);
  box-shadow: var(--shadow-1);
  border-top: 6px solid var(--sand-500);
}

.page-about .ab-observe__issue {
  display: inline-block;
  padding: 0.24rem 0.7rem;
  border-radius: var(--r-full);
  background: var(--ink-900);
  color: var(--sand-200);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}

.page-about .ab-observe__title {
  margin: 0.85rem 0 0.7rem;
  font-size: clamp(1.25rem, 3.8vw, 1.65rem);
  font-weight: 900;
  color: var(--ink-900);
}

.page-about .ab-observe__side {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.8rem;
}

.page-about .ab-observe__card {
  display: flex;
  flex-direction: column;
  gap: 0.28rem;
  padding: 1.1rem 1.15rem;
  background: var(--paper-100);
  border-radius: var(--ab-radius);
  box-shadow: var(--shadow-1);
  transition: transform var(--dur) var(--ease);
}

.page-about .ab-observe__card:hover {
  transform: translateY(-3px);
}

.page-about .ab-observe__card--warm {
  background: var(--orange-500);
}

.page-about .ab-observe__card--warm .ab-observe__cardnum,
.page-about .ab-observe__card--warm .ab-observe__cardlabel {
  color: var(--paper-100);
}

.page-about .ab-observe__cardnum {
  font-size: clamp(1.5rem, 4.6vw, 2rem);
  font-weight: 700;
  color: var(--celadon-500);
  line-height: 1;
}

.page-about .ab-observe__cardlabel {
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--ink-700);
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.4rem;
  align-items: center;
  margin-top: clamp(2rem, 5vw, 3.2rem);
  padding: clamp(1.4rem, 4vw, 2.2rem);
  background: linear-gradient(135deg, var(--ink-900), var(--ink-700) 82%);
  border-radius: var(--ab-radius);
  box-shadow: var(--shadow-2);
}

.page-about .ab-cta__h2 {
  margin: 0.5rem 0 0.7rem;
  font-size: clamp(1.3rem, 4vw, 1.8rem);
  font-weight: 900;
  color: var(--paper-100);
  text-shadow: 1px 0 0 rgba(228, 104, 28, 0.45);
}

.page-about .ab-cta .yw-kicker {
  color: var(--sand-200);
}

.page-about .ab-cta .yw-prose {
  margin: 0;
  color: rgba(245, 239, 227, 0.76);
}

.page-about .ab-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: 1.35fr 1fr;
    gap: clamp(2rem, 5vw, 3.4rem);
  }

  .page-about .ab-split {
    grid-template-columns: 1.05fr 0.95fr;
    gap: clamp(2rem, 5vw, 3.4rem);
  }

  .page-about .ab-split--flip {
    grid-template-columns: 0.95fr 1.05fr;
  }

  .page-about .ab-split--flip .ab-split__media {
    order: -1;
  }

  .page-about .ab-cities {
    grid-template-columns: 1.15fr 0.85fr;
    gap: clamp(2rem, 5vw, 3.2rem);
  }

  .page-about .ab-partners {
    grid-template-columns: 0.72fr 1.28fr;
    gap: clamp(2rem, 5vw, 3.2rem);
  }

  .page-about .ab-observe {
    grid-template-columns: 1.25fr 0.75fr;
    gap: clamp(2rem, 5vw, 3.2rem);
    align-items: start;
  }

  .page-about .ab-observe__side {
    grid-template-columns: 1fr;
  }

  .page-about .ab-cta {
    grid-template-columns: 1.3fr 0.7fr;
    gap: 2rem;
  }

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