.page-about {
  --about-rail-w: 180px;
  --about-spine-w: 2.9rem;
  --about-soft: rgba(246, 241, 230, .74);
  --about-soft-dim: rgba(246, 241, 230, .52);
  --about-volume-shadow:
    inset 0 0 0 1px rgba(180, 120, 60, .22),
    -10px 0 22px -18px rgba(11, 11, 12, .85);
  display: block;
}

/* ---------- 面包屑与首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 1.4rem 0 3.4rem;
  overflow: hidden;
  color: var(--paper);
  background:
    radial-gradient(120% 100% at 88% -12%, rgba(200, 16, 46, .30), transparent 58%),
    radial-gradient(85% 72% at -8% 28%, rgba(233, 185, 73, .16), transparent 62%),
    var(--ink);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-gold), transparent);
}

.page-about .about-hero__crumb .breadcrumb__list {
  margin: 0 0 1.6rem;
}

.page-about .about-hero__crumb .breadcrumb__link,
.page-about .about-hero__crumb .breadcrumb__item {
  color: var(--about-soft-dim);
  font-size: .82rem;
}

.page-about .about-hero__crumb .breadcrumb__link:hover {
  color: var(--gold);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 1.1rem;
  min-width: 0;
}

.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: baseline;
  gap: .55rem;
  margin: 0;
  font-size: .8rem;
  letter-spacing: .22em;
  color: var(--gold);
}

.page-about .about-hero__kicker .num {
  font-size: 1.6rem;
  letter-spacing: .02em;
}

.page-about .about-hero__title {
  margin: .3rem 0 0;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(2.05rem, 7.2vw, 4.6rem);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--paper);
  max-width: 22ch;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--gold);
  box-shadow: inset 0 -.22em 0 rgba(200, 16, 46, .55);
}

.page-about .about-hero__lede {
  margin: .4rem 0 0;
  max-width: 46ch;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: .6rem;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin: 1.4rem 0 0;
  padding-top: 1.4rem;
  border-top: 1px solid rgba(233, 185, 73, .3);
}

.page-about .about-hero__fact {
  min-width: 0;
}

.page-about .about-hero__fact dt {
  margin-bottom: .35rem;
  font-size: .74rem;
  letter-spacing: .14em;
  color: var(--about-soft-dim);
}

.page-about .about-hero__fact dd {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(1.7rem, 6vw, 2.4rem);
  line-height: 1;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

/* ---------- 品牌缘起 ---------- */
.page-about .about-origin__grid {
  align-items: start;
  gap: 2rem;
}

.page-about .about-origin .section-head__index,
.page-about .about-origin .section-head__title {
  color: var(--paper);
}

.page-about .about-origin .section-head__index {
  color: var(--gold);
}

.page-about .about-origin .section-head__note {
  color: var(--about-soft);
}

.page-about .about-origin .prose {
  color: var(--about-soft);
  max-width: 42ch;
}

.page-about .about-origin__note {
  margin-top: 1.6rem;
  border-left: 2px solid var(--copper);
  padding-left: 1rem;
}

.page-about .about-origin__note p {
  margin: .3rem 0 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--about-soft);
}

.page-about .about-origin__note .aside-note__label {
  color: var(--gold);
  letter-spacing: .18em;
  font-size: .72rem;
}

.page-about .about-origin__figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-origin__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(233, 185, 73, .28);
  filter: saturate(.82) contrast(1.04);
}

.page-about .about-origin__figure figcaption {
  margin-top: .7rem;
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--about-soft-dim);
}

/* ---------- 卷册 ---------- */
.page-about .about-volumes {
  background: var(--paper);
}

.page-about .about-volumes__grid {
  display: grid;
  gap: 2rem;
  margin-top: 2.2rem;
  min-width: 0;
}

.page-about .about-volumes__rail-title {
  margin: 0 0 .8rem;
  font-size: .72rem;
  letter-spacing: .24em;
  color: var(--stone);
}

.page-about .vol-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line-gold);
}

.page-about .vol-list a {
  display: flex;
  align-items: baseline;
  gap: .7rem;
  margin-left: -1px;
  padding: .5rem .5rem .5rem 1rem;
  border-left: 2px solid transparent;
  font-size: .84rem;
  color: var(--stone);
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .vol-list a:hover,
.page-about .vol-list a:focus-visible {
  color: var(--ink);
  border-left-color: var(--gold);
  transform: translateX(3px);
}

.page-about .vol-list .num {
  font-family: var(--font-num);
  font-size: 1rem;
  color: var(--copper);
}

.page-about .about-volumes__body {
  min-width: 0;
}

.page-about .about-vol {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-spine-w) minmax(0, 1fr);
  margin-bottom: .85rem;
  background: linear-gradient(180deg, rgba(243, 223, 166, .42), rgba(246, 241, 230, 0) 52%), var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--copper);
  box-shadow: var(--about-volume-shadow);
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .28s var(--ease), transform .28s var(--ease);
}

.page-about .about-vol.is-visible,
.page-about .about-vol.no-js-fallback {
  opacity: 1;
  transform: none;
}

.page-about .about-vol--open {
  border-left-color: var(--red);
  background: linear-gradient(180deg, rgba(233, 185, 73, .5), rgba(246, 241, 230, 0) 56%), var(--paper);
}

.page-about .about-vol__spine {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: .6rem 0;
  writing-mode: vertical-rl;
  letter-spacing: .22em;
  font-family: var(--font-num);
  font-size: .95rem;
  color: var(--gold);
  background: var(--ink);
}

.page-about .about-vol--open .about-vol__spine {
  background: var(--red);
  color: var(--paper);
}

.page-about .about-vol__text {
  padding: 1rem 1.1rem;
  min-width: 0;
}

.page-about .about-vol__text h3 {
  margin: 0 0 .45rem;
  font-family: var(--font-serif);
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-vol__text h3 .num {
  display: inline-block;
  margin-right: .5rem;
  font-family: var(--font-num);
  font-size: 1.15rem;
  color: var(--red);
  font-variant-numeric: tabular-nums;
}

.page-about .about-vol__text p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.78;
  color: var(--stone);
}

.page-about .about-volumes__figure {
  margin: 1.6rem 0 0;
}

.page-about .about-volumes__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
}

.page-about .about-volumes__figure figcaption {
  margin-top: .65rem;
  font-size: .78rem;
  color: var(--stone);
}

/* ---------- 四条服务线 ---------- */
.page-about .about-duties__grid {
  display: grid;
  gap: 2rem;
  min-width: 0;
}

.page-about .about-duties__figure {
  margin: 1.6rem 0 0;
}

.page-about .about-duties__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(180, 120, 60, .38);
  box-shadow: 8px 8px 0 rgba(200, 16, 46, .14);
}

.page-about .about-duties__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
  min-width: 0;
}

.page-about .about-duty {
  position: relative;
  padding: 1.1rem 1.1rem 1.1rem 1.3rem;
  background: rgba(246, 241, 230, .82);
  border-top: 2px solid var(--ink);
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .28s var(--ease), transform .28s var(--ease), border-color .25s var(--ease);
}

.page-about .about-duty.is-visible {
  opacity: 1;
  transform: none;
}

.page-about .about-duty:hover {
  border-top-color: var(--red);
}

.page-about .about-duty__num {
  display: block;
  margin-bottom: .4rem;
  font-family: var(--font-num);
  font-size: 1.5rem;
  line-height: 1;
  color: var(--copper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-duty:hover .about-duty__num {
  color: var(--gold);
}

.page-about .about-duty h3 {
  margin: 0 0 .4rem;
  font-family: var(--font-serif);
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-duty p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.78;
  color: var(--stone);
}

/* ---------- 团队与覆盖 ---------- */
.page-about .about-network .section-head__index,
.page-about .about-network .section-head__title {
  color: var(--paper);
}

.page-about .about-network .section-head__index {
  color: var(--gold);
}

.page-about .about-network .section-head__note {
  color: var(--about-soft);
}

.page-about .about-network__grid {
  display: grid;
  gap: 2rem;
  margin-top: 2rem;
  min-width: 0;
}

.page-about .about-network__stats {
  display: grid;
  gap: 1.2rem;
  min-width: 0;
}

.page-about .about-stat {
  padding-bottom: 1.2rem;
  border-bottom: 1px solid rgba(233, 185, 73, .22);
}

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

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(2.2rem, 8vw, 3rem);
  line-height: 1;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__plus {
  font-size: .7em;
  color: var(--copper);
}

.page-about .about-stat__label {
  display: block;
  margin: .35rem 0 .55rem;
  font-size: .76rem;
  letter-spacing: .16em;
  color: var(--about-soft-dim);
}

.page-about .about-stat p {
  margin: 0;
  max-width: 40ch;
  font-size: .9rem;
  line-height: 1.78;
  color: var(--about-soft);
}

.page-about .about-network__figure {
  margin: 0;
  min-width: 0;
  padding: 1.1rem;
  background: rgba(11, 11, 12, .45);
  border: 1px solid rgba(233, 185, 73, .3);
}

.page-about .about-chart {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-chart__axis line {
  stroke: rgba(233, 185, 73, .16);
  stroke-width: 1;
  stroke-dasharray: 3 7;
}

.page-about .about-chart__label {
  fill: var(--about-soft);
  font-family: var(--font-sans);
  font-size: 15px;
}

.page-about .about-chart__bar {
  stroke: var(--gold);
  stroke-width: 7;
  stroke-linecap: round;
  stroke-dasharray: 1 11;
  transition: stroke .25s var(--ease);
}

.page-about .about-chart__bar:hover {
  stroke: var(--red);
}

.page-about .about-network__caption {
  margin-top: .9rem;
  font-size: .8rem;
  line-height: 1.7;
  color: var(--about-soft-dim);
}

/* ---------- 条款修订 ---------- */
.page-about .about-revision__grid {
  display: grid;
  gap: 2rem;
  margin-top: 2rem;
  min-width: 0;
}

.page-about .about-revision__lead {
  min-width: 0;
}

.page-about .about-revision__lead .prose {
  max-width: 42ch;
}

.page-about .about-revision__lead .aside-note {
  margin-top: 1.4rem;
  padding-left: 1rem;
  border-left: 2px solid var(--gold);
}

.page-about .about-revision__lead .aside-note__label {
  font-size: .72rem;
  letter-spacing: .18em;
  color: var(--copper);
}

.page-about .about-revision__lead .aside-note p {
  margin: .3rem 0 0;
  font-size: .88rem;
  line-height: 1.75;
  color: var(--stone);
}

.page-about .about-revision__list {
  display: grid;
  gap: .7rem;
  min-width: 0;
}

.page-about .about-rev {
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--ink);
  transition: border-color .25s var(--ease);
}

.page-about .about-rev[open] {
  border-left-color: var(--red);
}

.page-about .about-rev summary {
  display: flex;
  align-items: baseline;
  gap: .6rem;
  padding: 1rem 1.1rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-rev summary::-webkit-details-marker {
  display: none;
}

.page-about .about-rev summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-num);
  font-size: 1.2rem;
  color: var(--copper);
}

.page-about .about-rev[open] summary::after {
  content: "−";
  color: var(--red);
}

.page-about .about-rev__cat {
  font-size: 1.02rem;
}

.page-about .about-rev__count {
  font-family: var(--font-num);
  font-size: 1.5rem;
  line-height: 1;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-rev__unit {
  font-size: .78rem;
  color: var(--stone);
}

.page-about .about-rev__body {
  padding: 0 1.1rem 1.1rem;
}

.page-about .about-rev__body p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.82;
  color: var(--stone);
}

/* ---------- 合作方构成 ---------- */
.page-about .about-partners {
  background: var(--paper);
}

.page-about .about-partners__grid {
  display: grid;
  gap: 1.2rem;
  margin-top: 2rem;
  min-width: 0;
}

.page-about .about-partner {
  position: relative;
  padding: 1.4rem 1.2rem;
  background: var(--sand);
  border-bottom: 3px solid var(--ink);
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .28s var(--ease), transform .28s var(--ease), border-color .25s var(--ease);
}

.page-about .about-partner.is-visible {
  opacity: 1;
  transform: none;
}

.page-about .about-partner:hover {
  border-bottom-color: var(--red);
}

.page-about .about-partner__tag {
  display: inline-block;
  margin-bottom: .8rem;
  padding: .2rem .6rem;
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--paper);
  background: var(--curtain);
}

.page-about .about-partner h3 {
  margin: 0 0 .55rem;
  font-family: var(--font-serif);
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-partner p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.82;
  color: var(--stone);
}

/* ---------- 长期价值 ---------- */
.page-about .about-value {
  color: var(--paper);
}

.page-about .about-value .section-head__index {
  color: var(--gold);
}

.page-about .about-value .section-head__title {
  color: var(--paper);
}

.page-about .about-value .section-head__note {
  color: var(--about-soft);
}

.page-about .about-value__grid {
  display: grid;
  gap: 2rem;
  min-width: 0;
}

.page-about .about-value__intro {
  min-width: 0;
}

.page-about .about-value__intro .prose {
  max-width: 42ch;
  color: var(--about-soft);
}

.page-about .about-value__cta {
  margin-top: 1.4rem;
}

.page-about .about-value__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
  min-width: 0;
}

.page-about .about-value__list li {
  position: relative;
  padding: 1.1rem 1.1rem 1.1rem 2.4rem;
  background: rgba(11, 11, 12, .34);
  border: 1px solid rgba(233, 185, 73, .26);
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .28s var(--ease), transform .28s var(--ease);
}

.page-about .about-value__list li.is-visible {
  opacity: 1;
  transform: none;
}

.page-about .about-value__list li::before {
  content: "";
  position: absolute;
  left: 1.1rem;
  top: 1.5rem;
  width: .55rem;
  height: .55rem;
  background: var(--gold);
  transform: rotate(45deg);
}

.page-about .about-value__list h3 {
  margin: 0 0 .4rem;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-value__list p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-value__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2.2rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(233, 185, 73, .3);
}

.page-about .about-value__foot p {
  margin: 0;
  font-size: .95rem;
  color: var(--about-soft);
}

.page-about .about-value__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
}

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

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

  .page-about .about-vol {
    grid-template-columns: var(--about-spine-w) minmax(0, 1fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 2rem 0 4.4rem;
  }

  .page-about .about-hero__grid {
    max-width: 62%;
  }

  .page-about .about-volumes__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 3.4rem;
    align-items: start;
  }

  .page-about .about-volumes__rail {
    position: sticky;
    top: 5.6rem;
  }

  .page-about .about-duties__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 3.4rem;
    align-items: start;
  }

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

  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 3.4rem;
    align-items: start;
  }

  .page-about .about-revision__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 3.4rem;
    align-items: start;
  }

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

  .page-about .about-value__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 3.4rem;
    align-items: start;
  }

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

@media (min-width: 1200px) {
  .page-about .about-volumes__grid {
    grid-template-columns: 210px minmax(0, 1fr);
  }

  .page-about .about-vol__text {
    padding: 1.25rem 1.6rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-vol,
  .page-about .about-duty,
  .page-about .about-partner,
  .page-about .about-value__list li {
    opacity: 1;
    transform: none;
    transition: none;
  }
}