/* ============ 品牌档案页 / page-about ============ */
.page-about {
  --ab-rule: 1px solid var(--c-line);
  display: block;
  color: var(--c-ink);
}

.page-about .ab-crumb {
  padding-top: clamp(18px, 3vw, 30px);
  font-size: 13px;
  letter-spacing: .04em;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding: clamp(22px, 4vw, 44px) 0 clamp(42px, 6vw, 78px);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: end;
}

.page-about .ab-hero__eyebrow {
  font-size: 11.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--c-signal);
  margin: 0 0 20px;
}

.page-about .ab-hero__title {
  font-family: var(--font-display);
  font-weight: 300;
  letter-spacing: .05em;
  font-size: clamp(34px, 7.2vw, 72px);
  line-height: 1.06;
  margin: 0;
  color: var(--c-ink);
  max-width: 15ch;
}

.page-about .ab-hero__lead {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  font-size: clamp(15.5px, 1.4vw, 17px);
  line-height: 1.82;
  color: var(--c-silver);
  max-width: 46ch;
}

.page-about .ab-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

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

/* ---------- 首屏数据条 ---------- */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(32px, 5vw, 56px) 0 0;
  background: var(--c-line);
  border: var(--ab-rule);
}

.page-about .ab-stats__cell {
  background: var(--c-dusk);
  padding: clamp(16px, 2.4vw, 26px) clamp(14px, 2vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .ab-stats__num {
  font-size: clamp(23px, 3.2vw, 34px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--c-signal);
}

.page-about .ab-stats__label {
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--c-mist);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-chapter {
  padding: clamp(44px, 7vw, 92px) 0;
  border-top: var(--ab-rule);
  position: relative;
}

.page-about .chapter-no {
  display: block;
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1;
  letter-spacing: .06em;
  color: var(--c-silver);
  opacity: .45;
}

.page-about .rail-note {
  margin: 10px 0 0;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .14em;
  color: var(--c-mist);
}

.page-about .section-head__label {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--c-grass-soft);
}

.page-about .section-head__title {
  font-family: var(--font-display);
  font-weight: 300;
  letter-spacing: .04em;
  font-size: clamp(26px, 4.4vw, 42px);
  line-height: 1.14;
  color: var(--c-ink);
  margin: 10px 0 0;
  max-width: 24ch;
}

.page-about .ab-text {
  margin: clamp(16px, 2.2vw, 24px) 0 0;
  font-size: clamp(15px, 1.3vw, 16.5px);
  line-height: 1.82;
  color: var(--c-silver);
  max-width: 64ch;
}

/* ---------- 年份时间轴 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0 0 14px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--c-line) transparent;
}

.page-about .ab-timeline::-webkit-scrollbar {
  height: 3px;
}

.page-about .ab-timeline::-webkit-scrollbar-thumb {
  background: var(--c-line);
}

.page-about .ab-timeline__item {
  flex: 0 0 auto;
  width: min(272px, 78vw);
  scroll-snap-align: start;
  position: relative;
  padding: 18px 0 0;
  border-top: 1px solid var(--c-line);
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 34px;
  height: 2px;
  background: var(--c-signal);
}

.page-about .ab-timeline__year {
  display: block;
  font-size: clamp(24px, 3vw, 30px);
  line-height: 1;
  letter-spacing: .04em;
  color: var(--c-signal);
  margin-bottom: 14px;
}

.page-about .ab-timeline__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 17px;
  letter-spacing: .03em;
  line-height: 1.35;
  color: var(--c-ink);
  margin: 0 0 8px;
}

.page-about .ab-timeline__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-mist);
}

/* ---------- 团队与复核 ---------- */
.page-about .ab-split {
  display: grid;
  gap: clamp(18px, 3.4vw, 36px);
  margin-top: clamp(24px, 3.6vw, 40px);
}

.page-about .ab-ratio,
.page-about .ab-steps {
  padding: clamp(18px, 2.6vw, 28px);
  background: var(--c-stand);
  border: var(--ab-rule);
}

.page-about .ab-ratio__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 15px;
  letter-spacing: .12em;
  color: var(--c-mist);
  margin: 0 0 18px;
}

.page-about .ab-ratio__track {
  display: flex;
  gap: 3px;
  height: 14px;
  margin-bottom: 20px;
}

.page-about .ab-ratio__seg {
  display: block;
  height: 100%;
}

.page-about .ab-ratio__seg--a {
  flex: 12 1 0;
  background: var(--c-signal);
}

.page-about .ab-ratio__seg--b {
  flex: 22 1 0;
  background: var(--c-grass);
}

.page-about .ab-ratio__legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  font-size: 14.5px;
  line-height: 1.5;
  color: var(--c-silver);
}

.page-about .ab-ratio__legend li {
  display: flex;
  align-items: center;
}

.page-about .ab-ratio__legend b {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 400;
  color: var(--c-ink);
  margin: 0 3px;
}

.page-about .ab-ratio__dot {
  display: inline-block;
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-right: 10px;
}

.page-about .ab-ratio__dot--a { background: var(--c-signal); }
.page-about .ab-ratio__dot--b { background: var(--c-grass); }

.page-about .ab-steps__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-steps__item {
  display: grid;
  grid-template-columns: minmax(58px, auto) minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding-top: 14px;
  border-top: 1px solid var(--c-line);
}

.page-about .ab-steps__item:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .ab-steps__key {
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--c-grass-soft);
  padding-top: 4px;
  white-space: nowrap;
}

.page-about .ab-steps__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--c-silver);
}

/* ---------- 内蒙古根基 ---------- */
.page-about .ab-chapter--region {
  background: linear-gradient(180deg, rgba(22, 39, 61, .55), transparent 62%);
}

.page-about .ab-slots {
  margin-top: clamp(24px, 3.6vw, 38px);
  border-top: var(--ab-rule);
}

.page-about .ab-slots__row {
  display: grid;
  grid-template-columns: minmax(64px, auto) minmax(0, 1fr);
  gap: clamp(14px, 3vw, 40px);
  align-items: baseline;
  padding: clamp(16px, 2.4vw, 24px) 0;
  border-bottom: var(--ab-rule);
}

.page-about .ab-slots__time {
  font-size: clamp(17px, 2.2vw, 21px);
  letter-spacing: .06em;
  color: var(--c-signal);
}

.page-about .ab-slots__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 17px;
  letter-spacing: .04em;
  color: var(--c-ink);
  margin: 0 0 6px;
}

.page-about .ab-slots__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--c-mist);
}

.page-about .ab-banner {
  margin: clamp(32px, 5vw, 58px) 0 0;
}

.page-about .ab-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 6;
  object-fit: cover;
  opacity: .42;
  filter: saturate(.55) contrast(1.05);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 16%, #000 84%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 16%, #000 84%, transparent);
}

.page-about .ab-banner__cap {
  margin: 12px 0 0;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--c-mist);
}

/* ---------- 内容分类图例 ---------- */
.page-about .ab-legend {
  list-style: none;
  margin: clamp(24px, 3.6vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--c-line);
  border: var(--ab-rule);
}

.page-about .ab-legend__item {
  position: relative;
  background: var(--c-dusk);
  padding: clamp(18px, 2.6vw, 26px);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background var(--dur) var(--ease);
}

.page-about .ab-legend__item::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 2px;
  background: transparent;
  transition: background var(--dur) var(--ease);
}

.page-about .ab-legend__item:hover {
  background: var(--c-stand);
}

.page-about .ab-legend__item:hover::before {
  background: var(--c-signal);
}

.page-about .ab-legend__swatch {
  display: block;
  width: 26px;
  height: 4px;
}

.page-about .ab-legend__swatch--signal { background: var(--c-signal); }
.page-about .ab-legend__swatch--soft { background: var(--c-signal-soft); }
.page-about .ab-legend__swatch--grass { background: var(--c-grass); }
.page-about .ab-legend__swatch--mint { background: var(--c-grass-soft); }
.page-about .ab-legend__swatch--silver { background: var(--c-silver); }
.page-about .ab-legend__swatch--mist { background: var(--c-mist); }

.page-about .ab-legend__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 19px;
  letter-spacing: .04em;
  line-height: 1.3;
  color: var(--c-ink);
  margin: 0;
}

.page-about .ab-legend__text {
  margin: 0;
  flex: 1 1 auto;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-mist);
}

.page-about .ab-legend__link {
  align-self: flex-start;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--c-signal);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}

.page-about .ab-legend__link:hover,
.page-about .ab-legend__link:focus-visible {
  border-bottom-color: var(--c-signal);
}

/* ---------- 山脊分隔 ---------- */
.page-about .ab-ridge {
  height: 58px;
  background: var(--c-stand);
  clip-path: var(--ridge-poly);
  opacity: .4;
  margin-bottom: -1px;
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partner {
  margin-top: clamp(24px, 3.6vw, 42px);
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
}

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

.page-about .ab-partner__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: var(--ab-rule);
}

.page-about .ab-partner__body .ab-text {
  margin-top: 0;
}

.page-about .ab-partner__list {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(128px, 1fr));
  gap: 1px;
  background: var(--c-line);
  border: var(--ab-rule);
}

.page-about .ab-partner__list li {
  background: var(--c-stand);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.page-about .ab-partner__list b {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 21px;
  line-height: 1.1;
  color: var(--c-grass-soft);
}

.page-about .ab-partner__list span {
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--c-mist);
}

/* ---------- 年度计划 ---------- */
.page-about .ab-plan {
  list-style: none;
  margin: clamp(24px, 3.6vw, 42px) 0 0;
  padding: 0;
  border-top: var(--ab-rule);
}

.page-about .ab-plan__item {
  display: grid;
  grid-template-columns: minmax(34px, auto) minmax(0, 1fr);
  gap: 6px clamp(14px, 3vw, 36px);
  padding: clamp(20px, 3vw, 30px) 0;
  border-bottom: var(--ab-rule);
}

.page-about .ab-plan__no {
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--c-signal);
  padding-top: 6px;
}

.page-about .ab-plan__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(18px, 2.2vw, 22px);
  letter-spacing: .03em;
  line-height: 1.35;
  color: var(--c-ink);
  margin: 0;
}

.page-about .ab-plan__text {
  grid-column: 2;
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--c-mist);
}

/* ---------- 结尾通道 ---------- */
.page-about .ab-cta {
  position: relative;
  overflow: hidden;
  padding: clamp(44px, 6vw, 84px) 0 clamp(54px, 7vw, 100px);
  border-top: var(--ab-rule);
  background:
    radial-gradient(120% 140% at 10% 0%, rgba(240, 128, 60, .14), transparent 58%),
    linear-gradient(180deg, var(--c-stand), var(--c-dusk));
}

.page-about .ab-cta::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 74px;
  background: var(--c-line);
  opacity: .55;
  clip-path: var(--ridge-poly);
  pointer-events: none;
}

.page-about .ab-cta__inner {
  position: relative;
  z-index: 1;
  max-width: 640px;
}

.page-about .ab-cta__title {
  font-family: var(--font-display);
  font-weight: 300;
  letter-spacing: .04em;
  font-size: clamp(26px, 4.4vw, 44px);
  line-height: 1.14;
  color: var(--c-ink);
  margin: 0;
}

.page-about .ab-cta__text {
  margin: clamp(14px, 2vw, 20px) 0 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--c-silver);
  max-width: 52ch;
}

/* ---------- 显现动效 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-legend {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .ab-split,
  .page-about .ab-partner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-partner {
    align-items: center;
    grid-template-columns: minmax(0, .92fr) minmax(0, 1fr);
  }
}

@media (min-width: 920px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr);
  }
}

@media (min-width: 1120px) {
  .page-about .ab-legend {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .page-about .ab-hero__title {
    font-size: clamp(31px, 10vw, 46px);
    max-width: none;
  }

  .page-about .ab-banner img {
    aspect-ratio: 16 / 8;
  }

  .page-about .ab-slots__row {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .ab-legend__item,
  .page-about .ab-legend__item::before,
  .page-about .ab-legend__link {
    transition: none;
  }
}
<<<END>>>