.page-about {
  --ab-line: 1px solid var(--ink-700);
  --ab-soft: rgba(159, 184, 177, .16);
}

/* ---------- 首屏框景 ---------- */
.page-about .ab-hero {
  padding-top: clamp(20px, 4vw, 40px);
}

.page-about .ab-hero .breadcrumb {
  margin-bottom: clamp(16px, 3vw, 26px);
}

.page-about .ab-frame {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4.6vw, 52px) clamp(20px, 4vw, 46px) clamp(26px, 4.2vw, 46px);
  border: var(--ab-line);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(120% 92% at 88% -6%, rgba(46, 242, 200, .18), transparent 58%),
    radial-gradient(96% 86% at -4% 104%, rgba(108, 75, 214, .22), transparent 62%),
    var(--ink-800);
  box-shadow: var(--shadow);
}

.page-about .ab-frame-ticks {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 10px;
  background: repeating-linear-gradient(90deg, var(--amber) 0 2px, transparent 2px 22px);
  opacity: .55;
}

.page-about .ab-frame h1 {
  margin: 12px 0 0;
  font-family: var(--font-cond);
  font-size: clamp(30px, 6.6vw, 54px);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--mist);
}

.page-about .ab-frame-lead {
  max-width: 62ch;
  margin: 16px 0 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--mist);
  opacity: .88;
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(24px, 3.6vw, 38px);
  border: var(--ab-line);
  border-radius: var(--radius-md);
  background: var(--ink-700);
  overflow: hidden;
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--ink-800);
}

.page-about .ab-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 30px);
  letter-spacing: .04em;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .ab-stat-label {
  font-size: 13px;
  color: var(--sage);
}

/* ---------- 起点与转变 ---------- */
.page-about .ab-origin {
  align-items: start;
}

.page-about .ab-shift {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .ab-shift-item {
  position: relative;
  padding: 0 0 0 20px;
  border-left: 2px solid var(--ink-700);
}

.page-about .ab-shift-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .ab-shift-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--amber);
}

.page-about .ab-shift-title {
  margin: 6px 0 6px;
  font-size: clamp(17px, 2vw, 20px);
  letter-spacing: -.01em;
  color: var(--mist);
}

.page-about .ab-shift-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
  opacity: .8;
}

.page-about .ab-coords {
  align-self: start;
}

.page-about .ab-coords .list-item {
  display: grid;
  grid-template-columns: 4.6em minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 12px 0;
}

.page-about .ab-coords .index-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .ab-coords .list-main {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  opacity: .86;
}

/* ---------- 版本时间带 ---------- */
.page-about .ab-milestone-head {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  align-items: center;
}

.page-about .ab-milestone-figure {
  margin: 0;
  max-width: 320px;
}

.page-about .ab-timeline {
  display: flex;
  gap: 14px;
  margin-top: clamp(22px, 3.4vw, 34px);
  padding: 22px 2px 18px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  border-top: 1px solid var(--ink-700);
  border-bottom: 1px solid var(--ink-700);
  scrollbar-width: thin;
  scrollbar-color: var(--ink-700) transparent;
}

.page-about .ab-timeline::-webkit-scrollbar {
  height: 6px;
}

.page-about .ab-timeline::-webkit-scrollbar-thumb {
  background: var(--ink-700);
  border-radius: var(--pill);
}

.page-about .ab-node {
  position: relative;
  flex: 0 0 clamp(216px, 68vw, 250px);
  scroll-snap-align: start;
  padding: 18px 16px 20px;
  border: var(--ab-line);
  border-radius: var(--radius-md);
  background: var(--ink-800);
}

.page-about .ab-node--current {
  border-color: var(--cyan);
  background:
    linear-gradient(180deg, rgba(46, 242, 200, .12), transparent 70%),
    var(--ink-800);
}

.page-about .ab-node-dot {
  display: block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 209, 102, .16);
}

.page-about .ab-node-index {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--amber);
}

.page-about .ab-node-title {
  margin: 8px 0 8px;
  font-size: 17px;
  letter-spacing: -.01em;
  color: var(--mist);
}

.page-about .ab-node-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--sage);
}

/* ---------- 团队 ---------- */
.page-about .ab-team-photo {
  margin: clamp(22px, 3vw, 30px) 0 0;
}

.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .ab-team-card {
  padding: 20px 18px 22px;
  border: var(--ab-line);
  border-radius: var(--radius-lg);
  background: var(--ink-800);
}

.page-about .ab-team-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 40px);
  letter-spacing: .04em;
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-team-name {
  margin: 10px 0 10px;
  font-size: 17px;
  color: var(--mist);
}

.page-about .ab-team-duty {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
  opacity: .82;
}

.page-about .ab-team-tag {
  display: inline-block;
  margin: 14px 0 0;
  padding: 4px 12px;
  border-radius: var(--pill);
  border: 1px solid var(--ink-700);
  font-size: 12px;
  color: var(--sage);
}

/* ---------- 流程链条 ---------- */
.page-about .ab-flow {
  padding: clamp(22px, 3.6vw, 40px);
}

.page-about .ab-chain {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .ab-step {
  border: var(--ab-line);
  border-radius: var(--radius-md);
  background: var(--ink-900);
  overflow: hidden;
}

.page-about .ab-step summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 14px 40px 14px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-step summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-step-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--amber);
}

.page-about .ab-step-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--mist);
}

.page-about .ab-step-meta {
  font-size: 12px;
  color: var(--sage);
  white-space: nowrap;
}

.page-about .ab-step .accordion-body {
  padding: 0 16px 16px;
}

.page-about .ab-step .accordion-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
  opacity: .82;
}

/* ---------- 云南 ---------- */
.page-about .ab-region {
  align-items: start;
}

.page-about .ab-region-main p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  opacity: .84;
}

.page-about .ab-region-note {
  margin-top: 18px !important;
  padding-top: 16px;
  border-top: 1px dashed var(--ink-700);
  color: var(--sage) !important;
  opacity: 1 !important;
}

.page-about .ab-dist {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-dist-row {
  display: grid;
  grid-template-columns: 3.6em minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  font-size: 14px;
}

.page-about .ab-dist-name {
  color: var(--mist);
}

.page-about .ab-dist-track {
  display: block;
  height: 8px;
  border-radius: var(--pill);
  background: var(--ink-700);
  overflow: hidden;
}

.page-about .ab-dist-fill {
  display: block;
  height: 100%;
  border-radius: var(--pill);
  background: linear-gradient(90deg, var(--cyan), var(--amber));
}

.page-about .ab-dist-val {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .ab-region-figure {
  margin: 0;
}

/* ---------- 合作墙 ---------- */
.page-about .ab-honor {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: clamp(22px, 3.4vw, 34px);
}

.page-about .ab-honor-card {
  padding: 22px 20px 24px;
  border: var(--ab-line);
  border-radius: var(--radius-lg);
  background: var(--ink-800);
  transition: transform .28s var(--ease), border-color .28s var(--ease);
}

.page-about .ab-honor-title {
  margin: 14px 0 10px;
  font-size: 17px;
  letter-spacing: -.01em;
  color: var(--mist);
}

.page-about .ab-honor-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--sage);
  opacity: .82;
  transition: opacity .24s var(--ease), color .24s var(--ease);
}

.page-about .ab-honor-card:hover .ab-honor-note,
.page-about .ab-honor-card:focus-within .ab-honor-note {
  opacity: 1;
  color: var(--mist);
}

.page-about .ab-honor-card:hover {
  border-color: var(--ink-700);
}

/* ---------- 结尾行动 ---------- */
.page-about .ab-next {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
  padding: clamp(24px, 4vw, 46px);
}

.page-about .ab-next-copy p {
  margin: 14px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  opacity: .88;
}

.page-about .ab-next-actions {
  align-self: end;
}

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

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

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

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

  .page-about .ab-milestone-figure {
    max-width: none;
    justify-self: end;
  }

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

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

  .page-about .ab-honor {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .ab-honor-card:nth-child(2) {
    transform: translateY(22px) rotate(-1.1deg);
  }

  .page-about .ab-honor-card:nth-child(3) {
    transform: translateY(-10px) rotate(1deg);
  }

  .page-about .ab-honor-card:nth-child(2):hover {
    transform: translateY(14px) rotate(-1.1deg);
  }

  .page-about .ab-honor-card:nth-child(3):hover {
    transform: translateY(-16px) rotate(1deg);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-honor-card,
  .page-about .ab-honor-note {
    transition: none;
  }

  .page-about .ab-honor-card:nth-child(2),
  .page-about .ab-honor-card:nth-child(3) {
    transform: none;
  }
}