.page-about {
  --ab-slant-h: clamp(44px, 7vw, 84px);
}

.page-about .breadcrumb {
  padding-block: 18px 10px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  background: var(--c-ink-green);
  color: var(--c-paper);
  border-radius: 0 0 var(--r-card) var(--r-card);
  padding: clamp(28px, 4vw, 48px) 0 clamp(36px, 6vw, 68px);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% -30% -10%;
  background:
    radial-gradient(55% 70% at 12% 102%, rgba(14, 124, 134, 0.55), transparent 70%),
    radial-gradient(45% 60% at 90% -10%, rgba(242, 163, 60, 0.22), transparent 70%);
  pointer-events: none;
}

.page-about .ab-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero-grid {
  gap: clamp(28px, 4vw, 56px);
  align-items: end;
}

.page-about .ab-kicker {
  color: var(--c-amber);
}

.page-about .ab-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 5.8vw, 4.2rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 14px 0 0;
  color: var(--c-paper);
}

.page-about .ab-lede {
  margin: 20px 0 0;
  max-width: 46ch;
  font-size: clamp(0.98rem, 1.4vw, 1.05rem);
  line-height: 1.85;
  color: var(--c-paper-2);
}

.page-about .ab-hero-actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-hero .btn--ghost {
  color: var(--c-paper);
  border-color: rgba(246, 241, 231, 0.42);
}

.page-about .ab-hero .btn--ghost:hover {
  background: rgba(246, 241, 231, 0.12);
  border-color: var(--c-amber);
}

.page-about .ab-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .ab-figure {
  background: rgba(10, 35, 29, 0.52);
  border: 1px solid rgba(246, 241, 231, 0.16);
  border-radius: var(--r-card-sm);
  padding: 16px 18px;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .ab-figure:hover {
  border-color: var(--c-amber);
  background: rgba(10, 35, 29, 0.82);
}

.page-about .ab-figure-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.8rem, 3.6vw, 2.5rem);
  line-height: 1;
  color: var(--c-amber);
}

.page-about .ab-figure-cap {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.65;
  color: var(--c-paper-2);
}

/* ---------- 通用区块 ---------- */
.page-about .ab-section {
  padding-block: clamp(48px, 7vw, 88px);
}

.page-about .ab-h2 {
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(1.45rem, 3vw, 2.1rem);
  line-height: 1.22;
  letter-spacing: 0;
  color: var(--c-ink);
  margin: 8px 0 0;
}

/* ---------- 起点 ---------- */
.page-about .ab-origin-grid {
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

.page-about .ab-origin-copy p {
  margin: 18px 0 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--c-ink);
  max-width: 64ch;
}

.page-about .ab-origin-copy .ab-h2 {
  margin-top: 0;
}

.page-about .ab-drop::first-letter {
  float: left;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 3.1em;
  line-height: 0.86;
  padding: 8px 12px 0 0;
  color: var(--c-water-deep);
}

.page-about .ab-origin-media {
  margin: 0;
}

.page-about .ab-origin-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-card) var(--r-card) var(--r-card) 0;
}

.page-about .ab-cap {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--c-ink-2);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  position: relative;
  background: var(--c-paper-2);
  padding-block: calc(var(--ab-slant-h) + clamp(20px, 3vw, 36px)) clamp(48px, 7vw, 88px);
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: var(--ab-slant-h);
  background: var(--c-paper);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 0);
  pointer-events: none;
}

.page-about .ab-timeline .section-head {
  margin-bottom: clamp(24px, 4vw, 40px);
}

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

.page-about .ab-tl-rail {
  margin-bottom: 22px;
}

.page-about .ab-tl-rail-label {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-ink-2);
}

.page-about .ab-tl-years {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
}

.page-about .ab-tl-years a {
  display: block;
  padding: 6px 12px;
  border-radius: var(--r-pill);
  border: 1px solid var(--c-line);
  background: var(--c-paper);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--c-ink-2);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-tl-years a:hover {
  color: var(--c-ink);
  background: var(--c-amber-soft);
  border-color: var(--c-amber);
}

.page-about .ab-tl-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .ab-tl-item {
  position: relative;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--r-card) 0 var(--r-card) var(--r-card);
  padding: clamp(20px, 3vw, 32px);
  scroll-margin-top: 120px;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-tl-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-1);
  border-color: var(--c-water);
}

.page-about .ab-tl-year {
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-variant-numeric: tabular-nums;
  color: var(--c-water-deep);
  letter-spacing: 0.02em;
}

.page-about .ab-tl-title {
  margin: 6px 0 0;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
  line-height: 1.35;
  color: var(--c-ink);
}

.page-about .ab-tl-item p {
  margin: 10px 0 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--c-ink-2);
  max-width: 62ch;
}

.page-about .ab-tl-item:last-child {
  background: var(--c-ink-green);
  border-color: var(--c-ink-green);
}

.page-about .ab-tl-item:last-child .ab-tl-year {
  color: var(--c-amber);
}

.page-about .ab-tl-item:last-child .ab-tl-title,
.page-about .ab-tl-item:last-child p {
  color: var(--c-paper);
}

/* ---------- 流程 ---------- */
.page-about .ab-flow {
  padding-block: clamp(48px, 7vw, 88px);
}

.page-about .ab-flow-media {
  margin: 0 0 clamp(24px, 4vw, 40px);
}

.page-about .ab-flow-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-card) var(--r-card) 0 var(--r-card);
}

.page-about .ab-flow-scroller {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 18px;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-flow-scroller:focus-visible {
  outline: 2px solid var(--c-focus);
  outline-offset: 4px;
}

.page-about .ab-step {
  position: relative;
  flex: 0 0 min(82vw, 330px);
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--r-card-sm) var(--r-card-sm) var(--r-card-sm) 0;
  padding: 22px 22px 18px;
}

.page-about .ab-step:hover {
  border-color: var(--c-water);
}

.page-about .ab-step-num {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-amber-deep);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-step-arrow {
  position: absolute;
  top: 16px;
  right: 18px;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--c-water);
  opacity: 0.7;
}

.page-about .ab-step h3 {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--c-ink);
}

.page-about .ab-step p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.78;
  color: var(--c-ink-2);
}

.page-about .ab-step details {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px dashed var(--c-line);
}

.page-about .ab-step summary {
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  color: var(--c-water-deep);
}

.page-about .ab-step summary:hover {
  color: var(--c-cinnabar);
}

.page-about .ab-step details p {
  margin-top: 8px;
  font-size: 0.88rem;
  color: var(--c-ink-2);
}

/* ---------- 编辑准则 ---------- */
.page-about .ab-canon-section {
  padding-block: clamp(12px, 2vw, 24px) clamp(48px, 7vw, 88px);
}

.page-about .ab-canon {
  position: relative;
  overflow: hidden;
  background: var(--c-ink-green);
  color: var(--c-paper);
  border-radius: var(--r-card);
  padding: clamp(28px, 4.5vw, 54px);
}

.page-about .ab-canon::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    90deg,
    rgba(246, 241, 231, 0.055) 0 1px,
    transparent 1px 76px
  );
  pointer-events: none;
}

.page-about .ab-canon > * {
  position: relative;
  z-index: 1;
}

.page-about .ab-canon .section-kicker {
  color: var(--c-amber);
}

.page-about .ab-canon .ab-h2 {
  color: var(--c-paper);
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .ab-canon-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
  counter-reset: canon;
}

.page-about .ab-canon-list li {
  position: relative;
  padding-left: 36px;
  font-size: 0.95rem;
  line-height: 1.82;
  color: var(--c-paper-2);
}

.page-about .ab-canon-list li::before {
  counter-increment: canon;
  content: counter(canon, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 3px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  color: var(--c-amber);
}

/* ---------- 数据卡与合作 ---------- */
.page-about .ab-partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: center;
}

.page-about .ab-partner-media {
  margin: 0;
}

.page-about .ab-partner-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-card) var(--r-card) 0 var(--r-card);
}

.page-about .ab-partner-copy p {
  margin: 16px 0 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--c-ink);
  max-width: 60ch;
}

.page-about .ab-partner-copy .ab-h2 {
  margin-top: 8px;
}

.page-about .ab-check-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-check-list li {
  position: relative;
  padding-left: 24px;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--c-ink);
}

.page-about .ab-check-list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-amber);
}

.page-about .ab-check-list a {
  color: var(--c-water-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .ab-check-list a:hover {
  color: var(--c-cinnabar);
}

/* ---------- 结尾 ---------- */
.page-about .ab-outro {
  padding-block: 0 clamp(56px, 8vw, 96px);
}

.page-about .ab-outro-card {
  background: var(--c-amber-soft);
  border-radius: var(--r-card) var(--r-card) var(--r-card) 0;
  padding: clamp(26px, 4vw, 48px);
}

.page-about .ab-outro-card p {
  margin: 16px 0 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--c-ink);
  max-width: 66ch;
}

.page-about .ab-outro-links {
  margin-top: 26px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .ab-link-card {
  display: block;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--r-card-sm);
  padding: 18px 20px;
  text-decoration: none;
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .ab-link-card:hover {
  transform: translateY(-3px);
  border-color: var(--c-water-deep);
  box-shadow: var(--shadow-1);
}

.page-about .ab-link-title {
  display: block;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 1rem;
  color: var(--c-ink);
}

.page-about .ab-link-desc {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-ink-2);
}

.page-about a:focus-visible,
.page-about summary:focus-visible,
.page-about .ab-flow-scroller:focus-visible {
  outline: 2px solid var(--c-focus);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .ab-outro-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-tl {
    display: grid;
    grid-template-columns: 170px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .ab-tl-rail {
    position: sticky;
    top: 96px;
    align-self: start;
    margin-bottom: 0;
  }

  .page-about .ab-tl-years {
    flex-direction: column;
    overflow: visible;
  }

  .page-about .ab-tl-years a {
    border-radius: var(--r-pill) 0 var(--r-pill) var(--r-pill);
  }

  .page-about .ab-partner-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.12fr);
  }

  .page-about .ab-canon-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 36px;
  }

  .page-about .ab-step {
    flex-basis: 320px;
  }
}

@media (max-width: 860px) {
  .page-about .ab-hero-grid,
  .page-about .ab-origin-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .ab-hero h1 br {
    display: none;
  }

  .page-about .ab-drop::first-letter {
    font-size: 2.6em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-figure,
  .page-about .ab-tl-item,
  .page-about .ab-step,
  .page-about .ab-link-card,
  .page-about .ab-tl-years a {
    transition: none;
  }

  .page-about .ab-tl-item:hover,
  .page-about .ab-link-card:hover {
    transform: none;
  }
}
<<<END>>>