.page-about {
  background: var(--ink-deep);
  color: var(--paper);
  font-family: var(--font-display);
  overflow-x: hidden;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(18px, 3vw, 30px);
  font-size: var(--t-12);
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .about-crumb .breadcrumb__item {
  display: inline-flex;
  align-items: center;
}

.page-about .about-crumb a {
  color: var(--mist);
  text-decoration: none;
  padding-bottom: 1px;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--turq);
  border-bottom-color: var(--turq);
}

.page-about .about-crumb .breadcrumb__sep {
  color: var(--line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4vw, 38px) 0 clamp(32px, 5vw, 64px);
  background:
    radial-gradient(120% 90% at 88% -12%, rgba(23, 179, 163, 0.20), transparent 62%),
    linear-gradient(165deg, var(--ink) 0%, var(--ink-deep) 72%);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--flag-band);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(201, 207, 221, 0.06) 0 1px, transparent 1px 92px);
  pointer-events: none;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

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

.page-about .about-hero__eyebrow {
  margin: 0;
  font-size: var(--t-12);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--turq);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-size: clamp(34px, 6.4vw, 64px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  max-width: 48ch;
  font-size: var(--t-16);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-hero__aside {
  border: 1px solid var(--line);
  border-top: 3px solid var(--turq);
  background: rgba(16, 27, 60, 0.72);
  padding: clamp(18px, 2.4vw, 24px);
}

.page-about .about-hero__aside-tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--t-12);
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .about-hero__aside-text {
  margin: 12px 0 0;
  font-size: var(--t-16);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-hero__city {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .about-hero__city li {
  font-family: var(--font-mono);
  font-size: var(--t-12);
  letter-spacing: 0.04em;
  color: var(--paper);
  border: 1px solid var(--line);
  padding: 5px 10px;
  border-left: 2px solid var(--gold);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: clamp(18px, 2.6vw, 26px) 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-hero__stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 4.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-hero__stat-label {
  font-size: var(--t-12);
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding: clamp(42px, 7vw, 88px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-section .rule {
  margin-bottom: clamp(14px, 2vw, 20px);
}

.page-about .about-section--paper {
  background: var(--paper);
  color: var(--ink);
  border-bottom: 1px solid var(--line);
}

.page-about h2 {
  margin: 0;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-section--paper h2 {
  color: var(--ink);
}

.page-about h3 {
  margin: 0;
  font-size: var(--t-22);
  line-height: 1.35;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .prose {
  margin: 16px 0 0;
  max-width: 64ch;
  font-size: var(--t-16);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-section--paper .prose,
.page-about .about-section--paper .about-prose--ink {
  color: #3B4460;
}

.page-about .about-note {
  margin: 22px 0 0;
  padding: 14px 16px;
  font-size: var(--t-14);
  line-height: 1.75;
  color: #3B4460;
  border-left: 3px solid var(--rust);
  background: rgba(178, 70, 46, 0.07);
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(22px, 3.4vw, 36px);
  margin-top: clamp(16px, 2.4vw, 24px);
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.92);
}

.page-about .about-figure__cap {
  padding: 10px 14px;
  font-size: var(--t-12);
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

.page-about .about-section--paper .about-figure {
  border-color: var(--line);
  background: var(--ink);
}

.page-about .about-figure--crop {
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .about-figure--map {
  margin: clamp(22px, 3.4vw, 34px) 0 0;
}

.page-about .about-figure--wide {
  margin: clamp(20px, 3vw, 30px) 0 0;
}

/* ---------- 团队条带 ---------- */
.page-about .team-band {
  display: flex;
  flex-direction: column;
  gap: 3px;
  margin-top: clamp(28px, 4.4vw, 46px);
}

.page-about .team-band__item {
  flex: var(--band-grow, 1) 1 0;
  min-width: 0;
  padding: 18px 18px 20px;
  background: var(--ink);
  border: 1px solid var(--line);
  border-top: 3px solid var(--band-accent, var(--turq));
  transition: transform 0.22s ease, border-color 0.22s ease;
}

.page-about .team-band__item:hover {
  transform: translateY(-3px);
  border-color: var(--gold);
}

.page-about .team-band__item--edit {
  --band-grow: 26;
  --band-accent: var(--turq);
}

.page-about .team-band__item--data {
  --band-grow: 18;
  --band-accent: var(--cyan);
}

.page-about .team-band__item--design {
  --band-grow: 12;
  --band-accent: var(--gold);
}

.page-about .team-band__item--support {
  --band-grow: 8;
  --band-accent: var(--rust);
}

.page-about .team-band__role {
  font-family: var(--font-serif);
  font-size: var(--t-18);
  font-weight: 600;
  color: var(--paper);
}

.page-about .team-band__num {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--t-28);
  font-weight: 700;
  line-height: 1;
  color: var(--band-accent, var(--gold));
}

.page-about .team-band__num span {
  font-size: var(--t-12);
  font-weight: 400;
  margin-left: 4px;
  color: var(--mist);
}

.page-about .team-band__desc {
  margin: 12px 0 0;
  font-size: var(--t-14);
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 三地协作 ---------- */
.page-about .about-cities {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .city-card {
  padding: 20px;
  background: #FFFFFF;
  border: 1px solid var(--line);
  box-shadow: 6px 6px 0 rgba(42, 51, 80, 0.12);
}

.page-about .city-card__tag {
  display: inline-block;
  margin: 0 0 12px;
  padding: 4px 9px;
  font-family: var(--font-mono);
  font-size: var(--t-12);
  letter-spacing: 0.06em;
  color: #FFFFFF;
  background: var(--rust);
}

.page-about .city-card__tag--cyan {
  background: #10887C;
}

.page-about .city-card__tag--gold {
  background: #A87828;
}

.page-about .city-card h3 {
  font-size: var(--t-18);
  color: var(--ink);
}

.page-about .city-card p {
  margin: 10px 0 0;
  font-size: var(--t-14);
  line-height: 1.75;
  color: #3B4460;
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 16px;
  list-style: none;
  margin: clamp(24px, 3.6vw, 36px) 0 0;
  padding: 0;
}

.page-about .about-flow__step {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--ink);
  border: 1px solid var(--line);
  border-top: 3px solid var(--gold);
}

.page-about .about-flow__time {
  display: inline-block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--t-14);
  letter-spacing: 0.1em;
  color: var(--gold);
  border: 1px solid rgba(233, 180, 92, 0.45);
  padding: 3px 8px;
}

.page-about .about-flow__step h3 {
  margin-top: 14px;
  font-size: var(--t-18);
  color: var(--paper);
}

.page-about .about-flow__step p {
  margin: 10px 0 0;
  font-size: var(--t-14);
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 折叠组 ---------- */
.page-about .about-acc {
  margin-top: clamp(22px, 3.4vw, 34px);
}

.page-about .about-acc--side {
  margin-top: clamp(16px, 2.4vw, 22px);
}

.page-about .acc__item {
  margin-top: 8px;
  background: var(--ink);
  border: 1px solid var(--line);
  transition: border-color 0.22s ease;
}

.page-about .acc__item:hover {
  border-color: var(--gold);
}

.page-about .acc__trigger {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 16px 18px;
  background: none;
  border: 0;
  color: var(--paper);
  font-family: var(--font-display);
  font-size: var(--t-16);
  font-weight: 700;
  line-height: 1.5;
  text-align: left;
  cursor: pointer;
}

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

.page-about .acc__sign {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  border: 1px solid var(--gold);
}

.page-about .acc__sign::before,
.page-about .acc__sign::after {
  content: "";
  position: absolute;
  background: var(--gold);
  transition: transform 0.24s ease;
}

.page-about .acc__sign::before {
  left: 3px;
  right: 3px;
  top: 6px;
  height: 1px;
}

.page-about .acc__sign::after {
  top: 3px;
  bottom: 3px;
  left: 6px;
  width: 1px;
}

.page-about .acc__item[data-open="true"] .acc__sign::after {
  transform: scaleY(0);
}

.page-about .acc__item[data-open="true"] {
  border-color: var(--gold);
}

.page-about .acc__inner {
  padding: 0 18px 18px 44px;
  font-size: var(--t-14);
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 内容标准 ---------- */
.page-about .about-standard {
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
  margin-top: clamp(14px, 2vw, 20px);
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(24px, 3.6vw, 38px) 0 0;
  padding: 0;
}

.page-about .tl-item {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.page-about .tl-item__year {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--t-14);
  letter-spacing: 0.04em;
  color: var(--gold);
  padding-top: 4px;
}

.page-about .tl-item__body {
  position: relative;
  padding-left: 16px;
  border-left: 1px solid var(--line);
}

.page-about .tl-item__body::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 8px;
  width: 7px;
  height: 7px;
  background: var(--gold);
  transform: rotate(45deg);
}

.page-about .tl-item--current .tl-item__body::before {
  background: var(--turq);
}

.page-about .tl-item__ver {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: var(--t-12);
  letter-spacing: 0.1em;
  color: var(--rust);
  background: rgba(178, 70, 46, 0.14);
  display: inline-block;
  padding: 3px 8px;
}

.page-about .tl-item--current .tl-item__ver {
  color: var(--ink);
  background: var(--turq);
}

.page-about .tl-item__body h3 {
  font-size: var(--t-18);
  color: var(--paper);
}

.page-about .tl-item__body p:not(.tl-item__ver) {
  margin: 8px 0 0;
  font-size: var(--t-14);
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 合作生态 ---------- */
.page-about .eco-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(22px, 3.4vw, 34px);
}

.page-about .eco-stat {
  padding: 18px 16px 20px;
  background: #FFFFFF;
  border: 1px solid var(--line);
  border-top: 3px solid var(--turq);
}

.page-about .eco-stat--wide {
  grid-column: 1 / -1;
  border-top-color: var(--rust);
}

.page-about .eco-stat__num {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 4.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
}

.page-about .eco-stat__num span {
  font-size: var(--t-22);
  color: var(--rust);
}

.page-about .eco-stat__label {
  margin: 10px 0 0;
  font-size: var(--t-14);
  font-weight: 700;
  color: var(--ink);
}

.page-about .eco-stat__desc {
  margin: 8px 0 0;
  font-size: var(--t-12);
  line-height: 1.7;
  color: #4A5372;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  position: relative;
  padding: clamp(40px, 6.4vw, 80px) 0 clamp(48px, 7vw, 90px);
  background: linear-gradient(150deg, var(--ink) 0%, var(--ink-deep) 78%);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--flag-band);
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(22px, 3.4vw, 36px);
  align-items: center;
}

.page-about .about-cta__lede {
  margin: 14px 0 0;
  max-width: 46ch;
  font-size: var(--t-16);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta__actions .btn {
  min-width: 0;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-cities {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .eco-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .eco-stat--wide {
    grid-column: span 1;
  }

  .page-about .tl-item {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 26px;
    padding: 22px 0;
  }

  .page-about .tl-item__year {
    font-size: var(--t-16);
    text-align: right;
    padding-top: 2px;
  }

  .page-about .tl-item__body {
    padding-left: 24px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(28px, 4vw, 56px);
  }

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

  .page-about .about-standard {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
    gap: clamp(30px, 4.4vw, 60px);
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 820px) {
  .page-about .team-band {
    flex-direction: row;
    align-items: stretch;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-flow__step:not(:last-child)::after {
    content: "";
    position: absolute;
    right: -10px;
    top: 32px;
    width: 14px;
    height: 14px;
    background: var(--ink);
    border-top: 1px solid var(--gold);
    border-right: 1px solid var(--gold);
    transform: rotate(45deg);
  }
}

/* ---------- 动效与降级 ---------- */
.js .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.js .page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-band__item,
  .page-about .acc__sign::before,
  .page-about .acc__sign::after,
  .page-about .acc__item {
    transition: none;
  }

  .page-about .team-band__item:hover {
    transform: none;
  }

  .js .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}