.page-about {
  --about-plate-w: 180px;
  --about-gap: clamp(20px, 3.2vw, 44px);
  background: var(--ink-deep);
  color: var(--cream);
  overflow-x: hidden;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  padding-block: clamp(20px, 4vw, 44px) clamp(30px, 5.5vw, 68px);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(18px, 3vw, 34px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--haze);
}

.page-about .breadcrumb__link {
  color: var(--haze);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-about .about-hero__frame {
  position: relative;
  border: var(--line) solid var(--stone);
  border-left: 6px solid var(--orange);
  padding: clamp(22px, 4vw, 52px);
  background:
    radial-gradient(120% 140% at 92% 8%, rgba(255, 106, 31, 0.14) 0%, rgba(255, 106, 31, 0) 52%),
    linear-gradient(158deg, var(--ink-mid) 0%, var(--ink-deep) 78%);
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -12%;
  width: 56%;
  height: 3px;
  background: var(--clay);
  transform: rotate(-9deg);
  transform-origin: right center;
  pointer-events: none;
}

.page-about .about-hero__frame .display {
  margin: 14px 0 0;
  color: var(--cream);
  max-width: 16em;
}

.page-about .about-hero__frame .lede {
  margin: 20px 0 0;
  max-width: 40em;
  color: var(--haze);
}

.page-about .about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

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

/* ============ 展览标签式分栏 ============ */
.page-about .exhibit {
  display: grid;
  grid-template-columns: var(--about-plate-w) minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .exhibit__plate {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 4px 0 8px 16px;
  border-left: 4px solid var(--clay);
}

.page-about .plate__no {
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--clay);
}

.page-about .plate__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--haze);
}

.page-about .plate__value {
  font-size: 13px;
  line-height: 1.5;
  color: var(--cream);
}

.page-about .exhibit__body .display {
  margin: 0 0 18px;
}

.page-about .exhibit__body .prose {
  margin: 0 0 16px;
  color: var(--haze);
  max-width: 38em;
}

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

.page-about .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--yellow);
  font-weight: 700;
}

/* ============ 01 定位 ============ */
.page-about .scope-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  margin: 30px 0;
  border-top: var(--line) solid var(--stone);
  border-bottom: var(--line) solid var(--stone);
}

.page-about .scope-strip__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  border-right: 1px solid var(--stone);
}

.page-about .scope-strip__item:last-child {
  border-right: 0;
}

.page-about .scope-strip__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--moss);
}

.page-about .scope-strip__val {
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 700;
  color: var(--cream);
  line-height: 1.3;
}

.page-about .scope-strip__desc {
  font-size: 13px;
  line-height: 1.65;
  color: var(--haze);
}

/* ============ 02 团队 ============ */
.page-about .team-bar {
  display: flex;
  margin: 30px 0 24px;
  min-height: 96px;
  border: var(--line) solid var(--stone);
}

.page-about .team-bar__seg {
  width: var(--seg);
  display: flex;
  align-items: center;
  justify-content: center;
  border-right: var(--line) solid var(--stone);
  transition: filter 200ms var(--ease);
}

.page-about .team-bar__seg:last-child {
  border-right: 0;
}

.page-about .team-bar__seg:hover {
  filter: brightness(1.16);
}

.page-about .team-bar__seg--edit {
  background: var(--orange);
}

.page-about .team-bar__seg--ops {
  background: var(--moss);
}

.page-about .team-bar__seg--prod {
  background: var(--clay);
}

.page-about .team-bar__num {
  color: var(--ink-deep);
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1;
}

.page-about .team-roles {
  margin: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--stone);
}

.page-about .team-roles__row {
  padding: 18px 0;
  border-bottom: 1px solid var(--stone);
}

.page-about .team-roles__term {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 700;
  color: var(--cream);
  margin-bottom: 8px;
}

.page-about .team-roles__dot {
  width: 12px;
  height: 12px;
  flex: 0 0 12px;
}

.page-about .team-roles__dot--edit {
  background: var(--orange);
}

.page-about .team-roles__dot--ops {
  background: var(--moss);
}

.page-about .team-roles__dot--prod {
  background: var(--clay);
}

.page-about .team-roles__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--haze);
  max-width: 40em;
}

/* ============ 媒体 ============ */
.page-about .stage-media {
  margin: 0 0 clamp(26px, 4vw, 46px);
  border: var(--line) solid var(--stone);
  overflow: hidden;
  position: relative;
}

.page-about .stage-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .stage-media--slim img {
  max-height: 340px;
  object-position: center;
}

.page-about .stage-media figcaption {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--haze);
  padding: 10px 16px;
  border-top: 1px solid var(--stone);
  background: var(--ink-mid);
}

/* ============ 03 六步流程 ============ */
.page-about .flow-steps {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  border-top: var(--line) solid var(--stone);
}

.page-about .flow-step {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 4px 18px;
  padding: 20px 0;
  border-bottom: 1px solid var(--stone);
  position: relative;
}

.page-about .flow-step::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 0;
  width: 0;
  height: 100%;
  background: var(--orange);
  transition: width 220ms var(--ease);
}

.page-about .flow-step:hover::before {
  width: 3px;
}

.page-about .flow-step__num {
  grid-row: span 2;
  font-size: clamp(24px, 2.6vw, 30px);
  line-height: 1.1;
  color: var(--clay);
}

.page-about .flow-step__name {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .flow-step__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--haze);
  max-width: 38em;
}

/* ============ 04 时间轴 ============ */
.page-about .timeline {
  margin-top: 30px;
  padding-left: 30px;
  border-left: 1px solid var(--stone);
}

.page-about .timeline__node {
  position: relative;
  padding-bottom: 34px;
}

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

.page-about .timeline__node::before {
  content: "";
  position: absolute;
  left: -37px;
  top: 6px;
  width: 13px;
  height: 13px;
  background: var(--clay);
  transition: background 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .timeline__node[data-active]::before {
  background: var(--orange);
  transform: scale(1.35);
}

.page-about .timeline__date {
  display: block;
  font-size: clamp(22px, 2.6vw, 28px);
  line-height: 1;
  color: var(--yellow);
  margin-bottom: 10px;
}

.page-about .timeline__name {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .timeline__note {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--haze);
  max-width: 36em;
}

/* ============ 可展开组 ============ */
.page-about .principle__trigger {
  display: flex;
  width: 100%;
  align-items: center;
  gap: 14px;
  padding: 12px 0;
  background: none;
  border: 0;
  color: var(--cream);
  font-family: inherit;
  font-size: 15px;
  text-align: left;
  cursor: pointer;
  transition: color 180ms var(--ease);
}

.page-about .principle__trigger:hover,
.page-about .principle__trigger:focus-visible {
  color: var(--orange);
}

.page-about .disclosure__index {
  font-family: var(--font-mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  color: var(--clay);
}

.page-about .disclosure__title {
  flex: 1 1 auto;
}

.page-about .disclosure__mark {
  position: relative;
  flex: 0 0 14px;
  width: 14px;
  height: 14px;
}

.page-about .disclosure__mark::before,
.page-about .disclosure__mark::after {
  content: "";
  position: absolute;
  background: var(--orange);
  transition: opacity 200ms var(--ease);
}

.page-about .disclosure__mark::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-about .disclosure__mark::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

.page-about .disclosure__trigger[aria-expanded="true"] .disclosure__mark::after {
  opacity: 0;
}

.page-about .disclosure__body {
  padding: 0 0 16px 30px;
  max-width: 40em;
}

.page-about .disclosure__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--haze);
}

/* ============ 05 合作生态 ============ */
.page-about .coop-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
  margin-top: 24px;
}

.page-about .coop-media {
  margin: 0;
  border: var(--line) solid var(--stone);
  border-top: 5px solid var(--orange);
  overflow: hidden;
}

.page-about .coop-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .coop-figures {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin-top: 26px;
  border-top: var(--line) solid var(--stone);
}

.page-about .coop-figure {
  flex: 1 1 140px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px 18px 0;
  border-right: 1px solid var(--stone);
}

.page-about .coop-figure:last-child {
  border-right: 0;
  padding-right: 0;
}

.page-about .coop-figure__num {
  font-size: clamp(28px, 3.6vw, 40px);
  line-height: 1;
  color: var(--yellow);
}

.page-about .coop-figure__label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--haze);
}

/* ============ 06 认可 ============ */
.page-about .about-recognition .exhibit__body .prose {
  color: var(--stone);
}

.page-about .about-recognition .exhibit__body .display {
  color: var(--ink-deep);
}

.page-about .about-recognition .num {
  color: var(--clay);
}

.page-about .about-recognition .plate__value {
  color: var(--stone);
}

.page-about .award-panel {
  display: flex;
  gap: 22px;
  align-items: flex-start;
  margin: 28px 0;
  padding: 24px;
  border: var(--line) solid var(--ink-deep);
  border-right: 8px solid var(--clay);
  background: rgba(255, 255, 255, 0.55);
}

.page-about .award-panel__badge {
  font-size: clamp(28px, 3.4vw, 38px);
  line-height: 1;
  color: var(--clay);
  flex: 0 0 auto;
}

.page-about .award-panel__name {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-deep);
}

.page-about .award-panel__note {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--stone);
  max-width: 40em;
}

/* ============ 07 原则 ============ */
.page-about .principle-list {
  margin-top: 26px;
  border-top: var(--line) solid var(--stone);
}

.page-about .principle {
  border-bottom: 1px solid var(--stone);
}

.page-about .principle .principle__trigger {
  font-size: 17px;
  font-weight: 700;
}

/* ============ 收尾 ============ */
.page-about .about-next {
  padding-block: clamp(36px, 6vw, 84px);
}

.page-about .about-next__box {
  border: var(--line) solid var(--orange);
  padding: clamp(24px, 4vw, 48px);
  background: linear-gradient(200deg, var(--ink-mid) 0%, var(--ink-deep) 70%);
}

.page-about .about-next__box .display {
  margin: 12px 0 14px;
  color: var(--cream);
}

.page-about .about-next__box .lede {
  margin: 0 0 26px;
  color: var(--haze);
  max-width: 38em;
}

.page-about .about-next__links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--stone);
}

.page-about .about-next__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 20px 18px 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--cream);
  text-decoration: none;
  border-bottom: 1px solid var(--stone);
  transition: color 180ms var(--ease), padding-left 180ms var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  color: var(--orange);
  padding-left: 8px;
}

/* ============ 响应式 ============ */
@media (max-width: 900px) {
  .page-about .coop-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .coop-media img {
    max-height: 320px;
  }

  .page-about .exhibit {
    grid-template-columns: 132px minmax(0, 1fr);
  }

  .page-about {
    --about-plate-w: 132px;
  }
}

@media (max-width: 680px) {
  .page-about .exhibit {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }

  .page-about .exhibit__plate {
    flex-direction: row;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 10px 14px;
    padding: 0 0 0 12px;
    border-left: 4px solid var(--clay);
  }

  .page-about .plate__no {
    font-size: 26px;
  }

  .page-about .plate__value {
    flex: 1 1 100%;
    font-size: 12px;
  }

  .page-about .scope-strip {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .scope-strip__item {
    border-right: 0;
    border-bottom: 1px solid var(--stone);
  }

  .page-about .scope-strip__item:last-child {
    border-bottom: 0;
  }

  .page-about .team-bar {
    flex-direction: column;
    min-height: 0;
  }

  .page-about .team-bar__seg {
    width: 100%;
    min-height: 54px;
    border-right: 0;
    border-bottom: var(--line) solid var(--stone);
  }

  .page-about .team-bar__seg:last-child {
    border-bottom: 0;
  }

  .page-about .flow-step {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 4px 14px;
  }

  .page-about .timeline {
    padding-left: 22px;
  }

  .page-about .timeline__node::before {
    left: -29px;
    width: 11px;
    height: 11px;
  }

  .page-about .disclosure__body {
    padding-left: 0;
  }

  .page-about .award-panel {
    flex-direction: column;
    gap: 14px;
    padding: 20px;
  }

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

  .page-about .about-hero__frame::after {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__node::before,
  .page-about .team-bar__seg,
  .page-about .flow-step::before,
  .page-about .about-next__link,
  .page-about .breadcrumb__link {
    transition: none;
  }
}

.page-about {
  --seg: 1rem;
}