.page-about {
  --ab-gap: clamp(1.5rem, 4vw, 3rem);
  --ab-rail-rule: rgba(201,162,39,.22);
  --ab-soft: rgba(245,242,233,.72);
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-block: clamp(1.1rem, 3vw, 1.75rem) 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.5rem, 5vw, 3.5rem) clamp(3rem, 8vw, 5.5rem);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: var(--ab-gap);
  align-items: center;
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  aspect-ratio: 3 / 4;
  max-height: 66vh;
  overflow: hidden;
  border: 1px solid var(--ab-rail-rule);
  background: linear-gradient(155deg, var(--celadon), var(--ink-deep));
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-hero__media .media-caption {
  position: absolute;
  inset: auto 0 0 0;
  padding: .7rem 1rem;
  background: linear-gradient(to top, rgba(11,31,26,.88), rgba(11,31,26,0));
  color: var(--gold-light);
  font-size: .8125rem;
  letter-spacing: .02em;
}

.page-about .about-hero__body {
  display: grid;
  gap: 1.15rem;
  align-content: center;
}

.page-about .about-hero__body .display-title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(2.1rem, 5.6vw, 3.9rem);
  line-height: 1.14;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .about-hero__body .lede {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(1rem, 1.4vw, 1.0625rem);
  line-height: 1.85;
  color: var(--ab-soft);
}

/* ---------- 分栏骨架 ---------- */
.page-about .about-block {
  padding-block: clamp(2.75rem, 7vw, 5.5rem);
}

.page-about .about-split {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .about-rail__num {
  margin: 0 0 .5rem;
  font-family: var(--font-serif);
  font-size: clamp(2.1rem, 4.6vw, 3.1rem);
  line-height: 1;
  letter-spacing: .05em;
  color: var(--gold);
}

.page-about .about-rail__title {
  margin: 0;
  padding-left: .85rem;
  border-left: 2px solid var(--ab-rail-rule);
  font-family: var(--font-serif);
  font-size: clamp(1.15rem, 2.2vw, 1.55rem);
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-rail__note {
  margin: .9rem 0 0;
  padding-left: calc(.85rem + 2px);
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--lime);
}

/* ---------- 品牌起点 ---------- */
.page-about .about-body .prose p {
  margin: 0 0 1.1rem;
  max-width: 60ch;
  line-height: 1.85;
  color: var(--ab-soft);
}

.page-about .about-body .prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-facts {
  margin: 2rem 0 0;
  border-top: 1px solid var(--ab-rail-rule);
}

.page-about .about-facts__row {
  display: grid;
  gap: .25rem;
  padding: .95rem 0;
  border-bottom: 1px solid rgba(245,242,233,.1);
}

.page-about .about-facts__row dt {
  font-size: .75rem;
  letter-spacing: .12em;
  color: var(--gold);
}

.page-about .about-facts__row dd {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.6;
  color: var(--paper);
}

/* ---------- 发展历程 ---------- */
.page-about .about-tl {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: ab-tl;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: .9rem;
  bottom: .9rem;
  width: 1px;
  background: linear-gradient(to bottom, var(--gold), rgba(201,162,39,.06));
}

.page-about .about-tl__item {
  position: relative;
  padding-left: 2rem;
  padding-bottom: clamp(1.4rem, 3.2vw, 2.3rem);
}

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

.page-about .about-tl__dot {
  position: absolute;
  left: 5px;
  top: .6rem;
  width: 11px;
  height: 11px;
  margin-left: -5px;
  border-radius: 50%;
  background: var(--ink-deep);
  border: 1px solid rgba(201,162,39,.5);
  box-shadow: 0 0 0 0 rgba(201,162,39,0);
  transition: background var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease);
}

.page-about .about-tl__item.is-revealed .about-tl__dot {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(201,162,39,.16);
}

.page-about .about-tl__year {
  margin: 0 0 .25rem;
  font-family: var(--font-serif);
  font-size: 1.125rem;
  letter-spacing: .08em;
  color: var(--gold-light);
}

.page-about .about-tl__title {
  margin: 0 0 .45rem;
  font-family: var(--font-serif);
  font-size: clamp(1.05rem, 2vw, 1.3125rem);
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-tl__text {
  margin: 0;
  max-width: 58ch;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--ab-soft);
}

/* ---------- 价值观（浅色分区） ---------- */
.page-about .section--paper .about-rail__num {
  color: var(--moss);
}

.page-about .section--paper .about-rail__title {
  color: var(--ink-deep);
  border-left-color: rgba(11,31,26,.2);
}

.page-about .section--paper .about-rail__note {
  color: rgba(26,26,26,.6);
}

.page-about .about-values__body {
  display: grid;
  gap: clamp(1.5rem, 3.5vw, 2.25rem);
}

.page-about .about-values__figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid rgba(11,31,26,.14);
}

.page-about .about-values__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 6;
  object-fit: cover;
}

.page-about .about-values__grid {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: rgba(11,31,26,.14);
  border: 1px solid rgba(11,31,26,.14);
}

.page-about .about-values__card {
  padding: clamp(1.1rem, 2.6vw, 1.6rem);
  background: var(--paper);
  transition: background var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease);
}

.page-about .about-values__term {
  margin: 0 0 .3rem;
  font-family: var(--font-serif);
  font-size: 1.25rem;
  letter-spacing: .12em;
  color: var(--moss);
}

.page-about .about-values__line {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .about-values__reveal {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--t-base) var(--ease);
}

.page-about .about-values__card:hover .about-values__reveal,
.page-about .about-values__card:focus-within .about-values__reveal {
  grid-template-rows: 1fr;
}

.page-about .about-values__detail {
  overflow: hidden;
  min-height: 0;
  margin: 0;
  font-size: .875rem;
  line-height: 1.75;
  color: rgba(26,26,26,.7);
}

.page-about .about-values__card:hover .about-values__detail,
.page-about .about-values__card:focus-within .about-values__detail {
  padding-top: .6rem;
}

.page-about .about-values__card:hover,
.page-about .about-values__card:focus-within {
  background: #fff;
  box-shadow: inset 3px 0 0 0 var(--cinnabar);
}

@media (hover: none) {
  .page-about .about-values__reveal {
    grid-template-rows: 1fr;
  }
  .page-about .about-values__detail {
    padding-top: .6rem;
  }
}

/* ---------- 服务与覆盖 ---------- */
.page-about .about-scale__lede {
  margin: 0 0 clamp(1.5rem, 3.5vw, 2.25rem);
  max-width: 54ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ab-soft);
}

.page-about .about-scale__list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--ab-rail-rule);
  border: 1px solid var(--ab-rail-rule);
}

.page-about .about-scale__item {
  padding: clamp(1.15rem, 3vw, 1.75rem);
  background: var(--ink-deep);
  transition: background var(--t-base) var(--ease);
}

.page-about .about-scale__item:hover {
  background: var(--ink);
}

.page-about .about-scale__num {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 5.4vw, 3.4rem);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--gold);
}

.page-about .about-scale__num span {
  font-size: .42em;
  margin-left: .15em;
  color: var(--gold-light);
}

.page-about .about-scale__unit {
  margin: .55rem 0 .6rem;
  font-size: .8125rem;
  letter-spacing: .14em;
  color: var(--paper);
}

.page-about .about-scale__desc {
  margin: 0;
  font-size: .875rem;
  line-height: 1.75;
  color: var(--ab-soft);
}

/* ---------- 生态与合作 ---------- */
.page-about .about-eco__body .prose {
  margin: 0 0 clamp(1.5rem, 3.5vw, 2.25rem);
  max-width: 60ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ab-soft);
}

.page-about .about-eco__figure {
  margin: 0 0 clamp(1.5rem, 3.5vw, 2.25rem);
  overflow: hidden;
  border: 1px solid var(--ab-rail-rule);
}

.page-about .about-eco__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 4;
  object-fit: cover;
}

.page-about .about-eco__points {
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.5rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-eco__points li {
  padding-left: 1rem;
  border-left: 2px solid var(--ab-rail-rule);
}

.page-about .about-eco__points h3 {
  margin: 0 0 .4rem;
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  letter-spacing: .06em;
  color: var(--gold-light);
}

.page-about .about-eco__points p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--ab-soft);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding-block: clamp(2.75rem, 7vw, 5rem);
  border-top: 1px solid var(--ab-rail-rule);
}

.page-about .about-cta__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-cta__body {
  display: grid;
  gap: .9rem;
  align-content: start;
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.55rem, 3.6vw, 2.3rem);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 54ch;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--ab-soft);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  align-content: start;
}

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

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 34%) minmax(0, 1fr);
    column-gap: clamp(2rem, 4.5vw, 3.75rem);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 34%) minmax(0, 1fr);
    column-gap: clamp(2rem, 5vw, 4.5rem);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 2rem;
  }

  .page-about .about-body .prose {
    padding-top: .25rem;
  }

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

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

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

  .page-about .about-cta__grid {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    column-gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
    max-width: 22rem;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__media {
    aspect-ratio: 3 / 4;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__item,
  .page-about .about-tl__dot,
  .page-about .about-values__card,
  .page-about .about-values__reveal,
  .page-about .about-scale__item {
    transition: none;
  }

  .page-about .about-tl__item {
    opacity: 1;
    transform: none;
  }

  .page-about .about-tl__item .about-tl__dot {
    background: var(--gold);
  }

  .page-about .about-values__reveal {
    grid-template-rows: 1fr;
  }

  .page-about .about-values__detail {
    padding-top: .6rem;
  }
}