.page-about {
  --about-gap: clamp(1.25rem, 3vw, 2.25rem);
  --about-panel: rgba(20, 8, 32, .72);
  --about-panel-soft: rgba(43, 15, 69, .5);
  --about-hair: rgba(201, 162, 39, .18);
  display: block;
  overflow-x: clip;
}

.page-about .section {
  position: relative;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-hero__inner {
  display: grid;
  gap: var(--about-gap);
  align-items: end;
  padding-top: clamp(1rem, 3vw, 1.75rem);
}

.page-about .about-hero__frame {
  padding: clamp(1.4rem, 4vw, 2.4rem);
  background:
    linear-gradient(150deg, rgba(43, 15, 69, .82), rgba(20, 8, 32, .9) 62%),
    radial-gradient(600px 320px at 88% 4%, rgba(106, 22, 48, .34), transparent 68%);
}

.page-about .about-hero h1 {
  margin: .55rem 0 1rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-h1);
  line-height: 1.22;
  letter-spacing: .01em;
  color: var(--c-ivory);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(1rem, 1.6vw, 1.075rem);
  line-height: 1.85;
  color: var(--c-mauve);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: clamp(1.2rem, 3vw, 1.9rem);
}

.page-about .about-hero__media {
  margin: 0;
}

.page-about .about-hero__media .img-frame__cap {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .02em;
  color: var(--c-slate);
}

.page-about .about-kpis {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-md);
  background: var(--about-hair);
  overflow: hidden;
}

.page-about .about-kpis .kpi {
  display: grid;
  gap: .35rem;
  padding: 1.05rem 1rem;
  border-radius: 0;
  background: linear-gradient(180deg, rgba(43, 15, 69, .6), rgba(20, 8, 32, .86));
}

.page-about .about-kpis .kpi__label {
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--c-mauve);
}

.page-about .about-kpis .kpi__value {
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  font-weight: 600;
  color: var(--c-gold-bright);
  font-variant-numeric: tabular-nums;
}

/* ---------- 品牌故事 ---------- */
.page-about .about-story__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-story__lead h2 {
  margin: .5rem 0 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-h2);
  line-height: 1.32;
  color: var(--c-ivory);
}

.page-about .about-story__body {
  border-left: 2px solid var(--line-gold);
  padding-left: clamp(1rem, 3vw, 1.75rem);
}

.page-about .about-story__body a {
  color: var(--c-gold-bright);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--line-gold);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__rail {
  position: relative;
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
  padding-left: clamp(1rem, 3vw, 2rem);
  border-left: 1px solid var(--line-gold);
}

.page-about .about-timeline__rail::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 0;
  width: 1px;
  height: 42%;
  background: linear-gradient(180deg, var(--c-gold-bright), transparent);
}

.page-about .stage {
  position: relative;
  margin-bottom: .9rem;
  border: 1px solid var(--line-gold-soft);
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, var(--about-panel-soft), var(--about-panel));
  transition: border-color .22s var(--ease), transform .22s var(--ease);
}

.page-about .stage::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(1rem, 3vw, 2rem) - 1px);
  top: 1.45rem;
  width: clamp(1rem, 3vw, 2rem);
  height: 1px;
  background: var(--line-gold);
}

.page-about .stage:hover {
  transform: translateX(3px);
  border-color: var(--line-gold);
}

.page-about .stage[open] {
  border-color: var(--line-gold);
}

.page-about .stage__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: .5rem .9rem;
  padding: 1rem 1.1rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .stage__no {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--c-gold-bright);
  font-variant-numeric: tabular-nums;
}

.page-about .stage__title {
  font-family: var(--font-display);
  font-size: clamp(1.02rem, 1.9vw, 1.2rem);
  font-weight: 600;
  line-height: 1.45;
  color: var(--c-ivory);
}

.page-about .stage__summary .tag {
  grid-column: 1 / -1;
  justify-self: start;
}

.page-about .stage__body {
  padding: 0 1.1rem 1.15rem;
}

.page-about .stage__body p {
  margin: 0 0 .85rem;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--c-mauve);
}

.page-about .stage__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: .45rem;
}

.page-about .stage__list li {
  position: relative;
  padding-left: 1.1rem;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--c-mauve);
}

.page-about .stage__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: .55rem;
  height: 1px;
  background: var(--c-gold);
}

/* ---------- 团队 ---------- */
.page-about .about-team__layout {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-team__media {
  margin: 0;
}

.page-about .about-team__media .img-frame__cap {
  font-family: var(--font-mono);
  font-size: .76rem;
  color: var(--c-slate);
}

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

.page-about .about-team__panel .filter-bar {
  margin-bottom: 1.1rem;
}

.page-about .about-team__grid {
  display: grid;
  gap: .9rem;
}

.page-about .team-card {
  position: relative;
  padding: 1.15rem 1.15rem 1.25rem;
  background: linear-gradient(170deg, rgba(20, 58, 50, .38), rgba(20, 8, 32, .82));
  border: 1px solid var(--line-gold-soft);
  overflow: hidden;
}

.page-about .team-card::after {
  content: "";
  position: absolute;
  right: -1px;
  top: -1px;
  width: 26px;
  height: 26px;
  border-top: 1px solid var(--c-gold);
  border-right: 1px solid var(--c-gold);
  border-radius: 0 var(--radius-sm) 0 0;
  opacity: .5;
}

.page-about .team-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3.4vw, 2.1rem);
  font-weight: 600;
  line-height: 1;
  color: var(--c-gold-bright);
  font-variant-numeric: tabular-nums;
}

.page-about .team-card .card__title {
  margin: .55rem 0 .45rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--c-ivory);
}

.page-about .team-card .card__text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--c-mauve);
}

/* ---------- 矩阵 ---------- */
.page-about .matrix-scroll {
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
}

.page-about .matrix-grid {
  display: grid;
  grid-template-columns: minmax(84px, 1.05fr) repeat(4, minmax(72px, 1fr));
  gap: 1px;
  min-width: 480px;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-md);
  background: var(--about-hair);
  overflow: hidden;
}

.page-about .matrix-corner,
.page-about .matrix-head,
.page-about .matrix-row,
.page-about .matrix-cell {
  padding: .7rem .55rem;
  font-size: .78rem;
  line-height: 1.4;
}

.page-about .matrix-corner {
  background: rgba(20, 8, 32, .92);
  font-family: var(--font-mono);
  font-size: .68rem;
  color: var(--c-slate);
  display: flex;
  align-items: center;
}

.page-about .matrix-head {
  background: linear-gradient(180deg, rgba(20, 58, 50, .9), rgba(20, 58, 50, .62));
  font-family: var(--font-display);
  font-weight: 600;
  font-size: .84rem;
  color: var(--c-ivory);
  text-align: center;
}

.page-about .matrix-row {
  display: flex;
  align-items: center;
  background: rgba(43, 15, 69, .78);
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--c-gold-bright);
}

.page-about .matrix-cell {
  display: grid;
  gap: .2rem;
  background: rgba(20, 8, 32, .68);
  text-align: center;
  transition: background .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .matrix-cell__no {
  font-family: var(--font-mono);
  font-size: .8rem;
  font-weight: 600;
  color: var(--c-ivory);
  font-variant-numeric: tabular-nums;
}

.page-about .matrix-cell__count {
  font-size: .68rem;
  line-height: 1.35;
  color: var(--c-slate);
  transition: color .2s var(--ease);
}

.page-about .matrix-cell:hover {
  background: rgba(201, 162, 39, .16);
  box-shadow: inset 0 0 0 1px var(--line-gold);
}

.page-about .matrix-cell:hover .matrix-cell__count {
  color: var(--c-gold-bright);
}

.page-about .matrix-note {
  margin: 1.1rem 0 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--c-mauve);
}

.page-about .matrix-note a,
.page-about .cadence-note a,
.page-about .about-partners__foot a {
  color: var(--c-gold-bright);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--line-gold);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence__layout {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-cadence__media {
  margin: 0;
}

.page-about .about-cadence__media .img-frame__cap {
  font-family: var(--font-mono);
  font-size: .76rem;
  color: var(--c-slate);
}

.page-about .cadence-list {
  display: grid;
  gap: .75rem;
}

.page-about .cadence-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .2rem .9rem;
  padding: .95rem 1.05rem;
  border: 1px solid var(--line-gold-soft);
  border-left: 3px solid var(--c-crimson);
  border-radius: var(--radius-sm);
  background: rgba(20, 8, 32, .6);
  transition: border-left-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .cadence-item:nth-child(2) {
  border-left-color: var(--c-pine);
}

.page-about .cadence-item:nth-child(3) {
  border-left-color: var(--c-gold);
}

.page-about .cadence-item:nth-child(4) {
  border-left-color: var(--c-teal);
}

.page-about .cadence-item:hover {
  transform: translateX(3px);
}

.page-about .cadence-item__key {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--c-gold-bright);
  padding-top: .18rem;
}

.page-about .cadence-item__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--c-ivory);
}

.page-about .cadence-item__text {
  grid-column: 2;
  margin: .3rem 0 0;
  font-size: .89rem;
  line-height: 1.72;
  color: var(--c-mauve);
}

.page-about .cadence-note {
  margin: 1.2rem 0 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--c-mauve);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners__panel {
  padding: clamp(1.4rem, 4vw, 2.6rem);
  background:
    linear-gradient(140deg, rgba(106, 22, 48, .34), rgba(20, 8, 32, .9) 58%),
    radial-gradient(520px 320px at 92% 92%, rgba(20, 58, 50, .5), transparent 70%);
}

.page-about .about-partners__head h2 {
  margin: .5rem 0 .9rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-h2);
  line-height: 1.32;
  color: var(--c-ivory);
}

.page-about .about-partners__lede {
  margin: 0;
  max-width: 62ch;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--c-mauve);
}

.page-about .about-partners__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(1.2rem, 3vw, 2rem) 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-md);
  background: var(--about-hair);
  overflow: hidden;
}

.page-about .about-partners__stats li {
  display: grid;
  gap: .3rem;
  padding: 1rem 1.05rem;
  background: rgba(14, 5, 24, .74);
}

.page-about .about-partners__num {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3vw, 1.75rem);
  font-weight: 600;
  color: var(--c-gold-bright);
  font-variant-numeric: tabular-nums;
}

.page-about .about-partners__label {
  font-size: .8rem;
  line-height: 1.5;
  color: var(--c-mauve);
}

.page-about .about-partners__foot {
  margin: 1.3rem 0 0;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--c-mauve);
}

/* ---------- 服务范围 ---------- */
.page-about .about-reach__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-reach__copy h2 {
  margin: .5rem 0 .95rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-h2);
  line-height: 1.32;
  color: var(--c-ivory);
}

.page-about .about-reach__copy p {
  margin: 0 0 .9rem;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--c-mauve);
}

.page-about .about-reach__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.3rem;
}

.page-about .about-reach__aside {
  padding: 1.3rem 1.2rem;
  border: 1px solid var(--line-gold-soft);
  border-radius: var(--radius-lg);
  background: linear-gradient(165deg, rgba(43, 15, 69, .82), rgba(20, 8, 32, .88));
}

.page-about .about-reach__aside-title {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--c-gold-bright);
}

.page-about .about-reach__steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: .8rem;
  counter-reset: reach;
}

.page-about .about-reach__steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .7rem;
  align-items: start;
  font-size: .89rem;
  line-height: 1.7;
  color: var(--c-mauve);
}

.page-about .about-reach__step-no {
  display: grid;
  place-items: center;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-gold);
  font-family: var(--font-mono);
  font-size: .74rem;
  color: var(--c-gold-bright);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-kpis {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-partners__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .stage__summary {
    grid-template-columns: auto minmax(0, 1fr) auto;
    padding: 1.15rem 1.35rem;
  }

  .page-about .stage__summary .tag {
    grid-column: auto;
    justify-self: end;
  }

  .page-about .stage__body {
    padding: 0 1.35rem 1.35rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-story__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }

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

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

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

  .page-about .about-reach__aside {
    padding: 1.6rem 1.5rem;
  }

  .page-about .about-team__media {
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
  }
}

@media (min-width: 1180px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .matrix-grid {
    min-width: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stage,
  .page-about .matrix-cell,
  .page-about .cadence-item {
    transition: none;
  }

  .page-about .stage:hover,
  .page-about .cadence-item:hover {
    transform: none;
  }
}