/* ===== 品牌档案页 · page-about ===== */
.page-about {
  display: block;
  background: var(--ink-900);
  color: var(--paper);
}

.page-about .breadcrumb {
  padding-top: 22px;
  font-family: var(--font-narrow);
  font-size: .78rem;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.page-about .section-label {
  margin: 0;
  font-family: var(--font-narrow);
  font-size: .78rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cy);
}

.page-about .section-title {
  margin: 10px 0 0;
  max-width: 24ch;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: var(--fs-h2);
  line-height: 1.32;
  color: var(--paper);
}

.page-about .lede {
  margin: 16px 0 0;
  max-width: 58ch;
  font-size: clamp(.93rem, 1.5vw, 1.03rem);
  line-height: 1.8;
  color: var(--mist);
}

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

.page-about .media-caption {
  margin-top: 10px;
  font-size: .78rem;
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--mist);
}

/* --- 首屏 --- */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 5vw, 48px) 0 clamp(34px, 6vw, 64px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--cy);
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  max-width: 20ch;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: var(--fs-display);
  line-height: 1.16;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .hero-track {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0 0 8px;
  display: flex;
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .hero-card {
  flex: 0 0 84%;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px 18px 20px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-top: 3px solid var(--cy);
  box-shadow: var(--shadow-card);
}

.page-about .hero-card:nth-child(2) {
  border-top-color: var(--violet);
}

.page-about .hero-card:nth-child(3) {
  border-top-color: var(--orange);
}

.page-about .hero-card__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.45;
  font-weight: 700;
  color: var(--paper);
}

.page-about .hero-card__text {
  flex: 1;
  margin: 0;
  font-size: .875rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .hero-card__link {
  align-self: flex-start;
  padding-bottom: 2px;
  font-family: var(--font-narrow);
  font-size: .78rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--cy);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-about .hero-card__link:hover {
  color: var(--orange);
}

/* --- 档案室开场 --- */
.page-about .about-intro {
  padding: clamp(40px, 7vw, 88px) 0;
}

.page-about .about-intro__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .prose p {
  margin: 0 0 14px;
  max-width: 42em;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--mist);
}

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

.page-about .about-intro__media,
.page-about .about-venue__media,
.page-about .about-local__media {
  margin: 0;
}

/* --- 发展节点 --- */
.page-about .about-timeline {
  padding: clamp(40px, 7vw, 90px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-timeline__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-index .index-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0 18px;
}

.page-about .about-index .index-link {
  display: block;
  padding: 7px 0 7px 12px;
  border-left: 2px solid var(--line);
  font-family: var(--font-narrow);
  font-size: .8rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--mist);
  text-decoration: none;
  transition: color .12s ease, border-color .12s ease;
}

.page-about .about-index .index-link:hover,
.page-about .about-index .index-link[aria-current="true"] {
  color: var(--cy);
  border-left-color: var(--cy);
}

.page-about .timeline-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .t-node {
  position: relative;
  margin-left: 5px;
  padding: 0 0 clamp(22px, 3vw, 34px) clamp(16px, 2.4vw, 26px);
  border-left: 1px solid var(--line);
}

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

.page-about .t-node::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  background: var(--ink-900);
  border: 2px solid var(--cy);
}

.page-about .t-node__title {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: var(--fs-h3);
  line-height: 1.4;
  color: var(--paper);
}

.page-about .t-node__year {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  letter-spacing: .06em;
  color: var(--orange);
}

.page-about .t-node__text {
  margin: 0;
  max-width: 60ch;
  font-size: .925rem;
  line-height: 1.8;
  color: var(--mist);
}

/* --- 数据资产（纸白区） --- */
.page-about .about-assets {
  padding: clamp(40px, 7vw, 88px) 0;
}

.page-about .section--paper {
  background: var(--paper);
  color: var(--black);
}

.page-about .about-assets .section-title,
.page-about .about-local .section-title {
  color: var(--black);
}

.page-about .about-assets .section-label {
  color: var(--violet);
}

.page-about .about-local .section-label {
  color: var(--orange);
}

.page-about .about-assets .lede {
  color: var(--black);
  opacity: .72;
}

.page-about .assets-grid {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-top: 28px;
}

.page-about .assets-cells {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--black);
  border: 1px solid var(--black);
}

.page-about .asset-cell {
  padding: clamp(14px, 2vw, 22px);
  background: var(--paper);
}

.page-about .asset-cell__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(1.55rem, 3.4vw, 2.15rem);
  line-height: 1;
  color: var(--black);
}

.page-about .asset-cell:nth-child(1) .asset-cell__num {
  color: var(--orange);
}

.page-about .asset-cell:nth-child(3) .asset-cell__num {
  color: var(--violet);
}

.page-about .asset-cell__unit {
  margin-left: 4px;
  font-size: .8rem;
  color: var(--black);
  opacity: .68;
}

.page-about .asset-cell__label {
  display: block;
  margin-top: 10px;
  font-size: .82rem;
  line-height: 1.65;
  color: var(--black);
  opacity: .82;
}

.page-about .asset-chart-wrap {
  margin: 0;
  padding: 16px;
  border: 1px solid var(--black);
  background: transparent;
}

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

.page-about .asset-chart polyline {
  fill: none;
  stroke: var(--violet);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-about .asset-chart circle {
  fill: var(--paper);
  stroke: var(--violet);
  stroke-width: 2;
}

.page-about .asset-chart__grid {
  stroke: var(--black);
  opacity: .2;
  stroke-width: 1;
}

.page-about .asset-chart text {
  font-family: var(--font-mono);
  font-size: 9px;
  fill: var(--black);
  opacity: .7;
}

.page-about .about-assets__cap {
  margin-top: 10px;
  font-size: .78rem;
  line-height: 1.6;
  color: var(--black);
  opacity: .72;
}

/* --- 场馆条目 --- */
.page-about .about-venue {
  padding: clamp(40px, 7vw, 90px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-venue__head .lede {
  max-width: 64ch;
}

.page-about .about-venue__body {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  margin-top: 28px;
  align-items: start;
}

.page-about .venue-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
}

.page-about .venue-table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: .88rem;
}

.page-about .venue-table caption {
  padding: 13px 14px;
  text-align: left;
  font-family: var(--font-narrow);
  font-size: .76rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--cy);
  border-bottom: 1px solid var(--line);
}

.page-about .venue-table th,
.page-about .venue-table td {
  padding: 11px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.page-about .venue-table thead th {
  background: var(--ink-800);
  font-family: var(--font-narrow);
  font-size: .76rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--paper);
  white-space: nowrap;
}

.page-about .venue-table tbody tr:nth-child(even) {
  background: var(--ink-800);
}

.page-about .venue-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .venue-table td {
  line-height: 1.7;
  color: var(--mist);
}

.page-about .venue-table td:first-child {
  color: var(--paper);
  font-weight: 500;
}

/* --- 团队与流程 --- */
.page-about .about-team {
  padding: clamp(40px, 7vw, 90px) 0;
}

.page-about .step-list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .step-item {
  padding: 16px 16px 18px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-top: 3px solid var(--cy);
}

.page-about .step-item:nth-child(3) {
  border-top-color: var(--orange);
}

.page-about .step-item:nth-child(4) {
  border-top-color: var(--violet);
}

.page-about .step-item__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  line-height: 1;
  color: var(--cy);
}

.page-about .step-item:nth-child(3) .step-item__num {
  color: var(--orange);
}

.page-about .step-item:nth-child(4) .step-item__num {
  color: var(--violet);
}

.page-about .step-item__title {
  margin: 10px 0 6px;
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .step-item__text {
  margin: 0;
  font-size: .86rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .team-facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 20px 0 0;
  display: grid;
  gap: 12px;
  border-top: 1px solid var(--line);
  font-size: .88rem;
  color: var(--mist);
}

.page-about .team-facts__num {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  color: var(--orange);
  margin-right: 4px;
}

/* --- 本地与合作 --- */
.page-about .about-local {
  padding: clamp(40px, 7vw, 88px) 0;
}

.page-about .about-local__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .about-local .prose p {
  color: var(--black);
  opacity: .78;
}

.page-about .local-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .local-list li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 12px 14px;
  border: 1px solid var(--black);
  font-size: .89rem;
  line-height: 1.7;
  color: var(--black);
}

.page-about .local-list__num {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--orange);
}

/* --- 收尾 --- */
.page-about .about-cta {
  padding: clamp(40px, 7vw, 90px) 0 clamp(48px, 8vw, 96px);
  border-top: 1px solid var(--line);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-cta__note {
  margin: 20px 0 0;
  max-width: 60ch;
  font-size: .85rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-cta__note a {
  color: var(--cy);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .to-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 30px;
  padding: 10px 16px;
  background: transparent;
  border: 1px solid var(--line);
  font-family: var(--font-narrow);
  font-size: .76rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--mist);
  cursor: pointer;
}

.page-about .to-top:hover {
  color: var(--cy);
  border-color: var(--cy);
}

/* --- 响应式 --- */
@media (min-width: 640px) {
  .page-about .assets-cells {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .team-facts li {
    padding-right: 16px;
    border-right: 1px solid var(--line);
  }

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

@media (min-width: 760px) {
  .page-about .hero-card {
    flex: 0 0 60%;
  }

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

@media (min-width: 900px) {
  .page-about .hero-track {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    overflow: visible;
    scroll-snap-type: none;
  }

  .page-about .hero-card {
    flex: none;
  }

  .page-about .about-intro__grid,
  .page-about .about-local__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-timeline__grid {
    grid-template-columns: minmax(180px, 220px) minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }

  .page-about .about-index .index-list {
    display: block;
  }

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

  .page-about .about-venue__body {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index .index-link {
    transition: none;
  }
}