.page-about {
  --about-paper-line: rgba(16, 22, 20, 0.14);
  --about-paper-sub: #57635F;
  --about-paper-num: #7C8A84;
  --about-dark-line: var(--hair);
  --about-gap: clamp(20px, 3.4vw, 38px);
  background: var(--night);
  color: var(--ink);
  overflow-x: hidden;
}

/* ---------- 通用区块节奏 ---------- */
.page-about .about-section {
  padding-block: clamp(46px, 7.5vw, 92px);
}

.page-about .about-section + .about-section {
  border-top: 1px solid var(--about-dark-line);
}

.page-about .about-crumbs {
  padding-top: clamp(18px, 3vw, 30px);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s12);
  margin-top: var(--s26);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  border-top: 0;
  padding-top: clamp(30px, 5vw, 54px);
}

.page-about .about-hero-grid {
  display: grid;
  gap: var(--about-gap);
  align-items: end;
}

.page-about .about-hero-copy .display-1 {
  margin: var(--s16) 0 0;
  line-height: 1.06;
}

.page-about .about-hero-copy .lede {
  margin-top: var(--s20);
  max-width: 34em;
}

.page-about .about-hero-copy .body-copy {
  margin-top: var(--s16);
  max-width: 34em;
  color: var(--muted);
}

.page-about .about-hero-media {
  border-radius: var(--radius-card);
}

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

/* ---------- 纸面区块（浅底） ---------- */
.page-about .about-flow,
.page-about .about-check {
  background: var(--paper);
  color: var(--paper-ink);
}

.page-about .about-flow .display-2,
.page-about .about-flow .display-3,
.page-about .about-flow .flow-title,
.page-about .about-check .display-2,
.page-about .about-check .check-step-title {
  color: var(--paper-ink);
}

.page-about .about-flow .body-copy,
.page-about .about-check .body-copy {
  color: var(--about-paper-sub);
}

.page-about .flow-eyebrow,
.page-about .check-eyebrow {
  color: #3F4A46;
}

/* ---------- 四步流程 ---------- */
.page-about .flow-grid {
  display: grid;
  gap: clamp(28px, 4.5vw, 56px);
}

.page-about .flow-intro {
  margin-top: var(--s16);
  max-width: 40em;
}

.page-about .flow-list {
  list-style: none;
  margin: var(--s26) 0 0;
  padding: 0;
  counter-reset: flow;
}

.page-about .flow-item {
  counter-increment: flow;
  position: relative;
  padding: clamp(18px, 2.4vw, 26px) 0 clamp(18px, 2.4vw, 26px) 62px;
  border-top: 1px solid var(--about-paper-line);
}

.page-about .flow-item:last-child {
  border-bottom: 1px solid var(--about-paper-line);
}

.page-about .flow-item::before {
  content: counter(flow, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: clamp(18px, 2.4vw, 26px);
  font-family: var(--font-num);
  font-size: var(--s26);
  font-weight: 700;
  line-height: 1;
  color: var(--about-paper-num);
  font-variant-numeric: tabular-nums;
}

.page-about .flow-title {
  margin: 0 0 var(--s12);
  font-family: var(--font-display);
  font-size: var(--s20);
  font-weight: 600;
  letter-spacing: 0.01em;
}

.page-about .flow-desc {
  margin: 0;
  font-size: var(--s16);
  line-height: 1.75;
  color: var(--about-paper-sub);
  max-width: 34em;
}

.page-about .flow-media {
  margin: 0;
  align-self: start;
}

.page-about .flow-media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-card);
  box-shadow: 0 2px 4px rgba(16, 22, 20, 0.14);
}

.page-about .flow-media figcaption {
  margin-top: var(--s12);
  font-size: var(--s12);
  letter-spacing: 0.04em;
  color: var(--about-paper-sub);
  line-height: 1.6;
}

/* ---------- 时间轴 ---------- */
.page-about .timeline-heading {
  margin: var(--s12) 0 var(--s26);
}

.page-about .timeline-rail {
  display: flex;
  overflow-x: auto;
  border-top: 1px solid var(--about-dark-line);
  scrollbar-width: thin;
  scroll-snap-type: x proximity;
}

.page-about .timeline-node {
  position: relative;
  flex: 1 0 128px;
  min-width: 128px;
  padding: var(--s26) var(--s16) var(--s20) 0;
  background: transparent;
  border: 0;
  text-align: left;
  color: var(--muted);
  font: inherit;
  cursor: pointer;
  scroll-snap-align: start;
  transition: color 0.26s var(--ease);
}

.page-about .timeline-node:hover,
.page-about .timeline-node:focus-visible {
  color: var(--ink);
}

.page-about .timeline-node[aria-selected="true"] {
  color: var(--ink);
}

.page-about .timeline-dot {
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--about-dark-line);
  transition: background 0.26s var(--ease), box-shadow 0.26s var(--ease);
}

.page-about .timeline-node[aria-selected="true"] .timeline-dot {
  background: var(--lime);
  animation: about-pulse 2.6s var(--ease) infinite;
}

.page-about .timeline-year {
  display: block;
  font-size: clamp(var(--s34), 5vw, var(--s48));
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
}

.page-about .timeline-label {
  display: block;
  margin-top: var(--s12);
  font-size: var(--s14);
  letter-spacing: 0.04em;
  color: inherit;
}

.page-about .timeline-panels {
  margin-top: var(--s26);
  display: grid;
  gap: var(--s16);
}

.page-about .timeline-panel {
  background: var(--panel);
  border: 1px solid var(--about-dark-line);
  border-radius: var(--radius-slab);
  padding: clamp(20px, 3vw, 32px);
  box-shadow: var(--shadow-hair);
}

.page-about .timeline-panel .display-3 {
  margin: var(--s16) 0 var(--s12);
}

.page-about .timeline-panel .body-copy {
  margin: 0;
  max-width: 46em;
  color: var(--muted);
}

.page-about .timeline-panel[hidden] {
  display: none;
}

@keyframes about-pulse {
  0%, 100% {
    box-shadow: 0 0 0 4px rgba(180, 255, 58, 0.2);
  }
  50% {
    box-shadow: 0 0 0 10px rgba(180, 255, 58, 0.03);
  }
}

/* ---------- 作者与编辑组 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(28px, 4.5vw, 52px);
}

.page-about .team-copy .display-2 {
  margin: var(--s12) 0 var(--s20);
}

.page-about .team-copy .body-copy {
  max-width: 38em;
  color: var(--muted);
}

.page-about .about-pull {
  margin: var(--s26) 0 0;
  padding-left: var(--s20);
  border-left: 2px solid var(--lime);
  font-family: var(--font-display);
  font-size: clamp(var(--s20), 2.6vw, var(--s26));
  font-weight: 600;
  font-style: italic;
  line-height: 1.5;
  color: var(--ink);
  max-width: 30em;
}

.page-about .team-stats {
  display: grid;
  gap: var(--s26);
}

.page-about .team-stat-row {
  border-top: 1px solid var(--about-dark-line);
  border-bottom: 1px solid var(--about-dark-line);
}

.page-about .team-stat-row .stat-num {
  font-size: clamp(var(--s34), 5vw, var(--s48));
}

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

.page-about .region-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--s12);
  padding: var(--s16) 0;
  border-bottom: 1px solid var(--about-dark-line);
}

.page-about .region-name {
  font-family: var(--font-display);
  font-size: var(--s20);
  font-weight: 600;
  color: var(--lime);
}

.page-about .region-note {
  font-size: var(--s14);
  color: var(--muted);
  letter-spacing: 0.02em;
}

.page-about .team-media {
  margin: clamp(28px, 4.5vw, 54px) 0 0;
}

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

/* ---------- 复核与纠错 ---------- */
.page-about .check-grid {
  display: grid;
  gap: clamp(28px, 4.5vw, 52px);
}

.page-about .check-main .display-2 {
  margin: var(--s12) 0 var(--s20);
}

.page-about .check-main .body-copy {
  max-width: 38em;
}

.page-about .check-main .link-arrow {
  display: inline-block;
  margin-top: var(--s20);
}

.page-about .check-steps {
  display: grid;
  gap: 0;
}

.page-about .check-step {
  position: relative;
  padding: var(--s20) 0 var(--s20) 58px;
  border-top: 1px solid var(--about-paper-line);
}

.page-about .check-step:last-child {
  border-bottom: 1px solid var(--about-paper-line);
}

.page-about .check-step-num {
  position: absolute;
  left: 0;
  top: var(--s20);
  font-size: var(--s20);
  font-weight: 700;
  color: var(--about-paper-num);
}

.page-about .check-step-ember .check-step-num {
  color: var(--ember);
}

.page-about .check-step-title {
  margin: 0 0 var(--s12);
  font-family: var(--font-display);
  font-size: var(--s20);
  font-weight: 600;
}

.page-about .check-step-desc {
  margin: 0;
  font-size: var(--s16);
  line-height: 1.75;
  color: var(--about-paper-sub);
}

/* ---------- 合作伙伴 ---------- */
.page-about .partners-lede {
  margin-top: var(--s16);
  max-width: 40em;
  color: var(--muted);
}

.page-about .partner-scroll {
  display: flex;
  gap: var(--s16);
  overflow-x: auto;
  margin-top: var(--s26);
  padding-bottom: var(--s16);
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .partner-card {
  flex: 0 0 clamp(240px, 72vw, 300px);
  scroll-snap-align: start;
  background: var(--raised);
  border: 1px solid var(--about-dark-line);
  border-radius: var(--radius-slab);
  padding: clamp(20px, 3vw, 28px);
  box-shadow: var(--shadow-hair);
}

.page-about .partner-num {
  display: block;
  font-size: clamp(var(--s34), 5vw, var(--s48));
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .partner-card:nth-child(2) .partner-num {
  color: var(--cyan);
}

.page-about .partner-card:nth-child(3) .partner-num {
  color: var(--ember);
}

.page-about .partner-card:nth-child(4) .partner-num {
  color: var(--amber);
}

.page-about .partner-title {
  margin: var(--s16) 0 var(--s12);
  font-family: var(--font-display);
  font-size: var(--s20);
  font-weight: 600;
  color: var(--ink);
}

.page-about .partner-desc {
  margin: 0;
  font-size: var(--s14);
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  border-bottom: 1px solid var(--about-dark-line);
}

.page-about .next-grid {
  display: grid;
  gap: clamp(28px, 4.5vw, 52px);
}

.page-about .next-copy .display-2 {
  margin: var(--s12) 0 var(--s20);
}

.page-about .next-copy .body-copy {
  max-width: 36em;
  color: var(--muted);
}

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

.page-about .next-item {
  padding: var(--s20) 0;
  border-top: 1px solid var(--about-dark-line);
}

.page-about .next-item:last-child {
  border-bottom: 1px solid var(--about-dark-line);
}

.page-about .next-title {
  margin: 0 0 var(--s12);
  font-family: var(--font-display);
  font-size: var(--s20);
  font-weight: 600;
  color: var(--ink);
}

.page-about .next-item::marker {
  content: none;
}

.page-about .next-desc {
  margin: 0;
  font-size: var(--s14);
  line-height: 1.75;
  color: var(--muted);
  max-width: 34em;
}

/* ---------- 桌面版 ---------- */
@media (min-width: 860px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 4vw, 64px);
  }

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

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

  .page-about .check-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
  }

  .page-about .next-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
  }

  .page-about .timeline-panels {
    margin-top: var(--s34);
  }

  .page-about .partner-card {
    flex: 0 0 300px;
  }
}

@media (min-width: 1180px) {
  .page-about .timeline-rail {
    overflow-x: visible;
  }

  .page-about .timeline-node {
    flex: 1 1 0;
  }
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 599px) {
  .page-about .about-hero-copy .display-1 {
    font-size: clamp(34px, 10vw, 48px);
  }

  .page-about .flow-item {
    padding-left: 52px;
  }

  .page-about .check-step {
    padding-left: 50px;
  }

  .page-about .about-pull {
    padding-left: var(--s16);
  }

  .page-about .partner-card {
    flex: 0 0 84vw;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .timeline-node[aria-selected="true"] .timeline-dot {
    animation: none;
    box-shadow: 0 0 0 5px rgba(180, 255, 58, 0.18);
  }

  .page-about .timeline-node,
  .page-about .timeline-dot {
    transition: none;
  }
}