.page-about {
  --ab-year-col: 92px;
  --ab-paper-shadow: 5px 5px 0 var(--paper-ink);
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding: clamp(18px, 3vw, 32px) 0 clamp(30px, 5vw, 56px);
}

.page-about .ab-hero .eyebrow {
  color: var(--orange);
  letter-spacing: .18em;
}

.page-about .ab-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 8.4vw, 82px);
  line-height: 1.02;
  letter-spacing: -.01em;
  margin: 12px 0 20px;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .ab-hl {
  color: var(--cyan);
  border-bottom: 4px solid var(--orange);
  padding-bottom: 2px;
}

.page-about .ab-hero .lede {
  max-width: 60ch;
  color: var(--text);
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.75;
  margin: 0;
}

.page-about .ab-figures {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: clamp(18px, 3vw, 26px) 0 0;
  border-top: 2px solid var(--hair);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
}

.page-about .ab-figures li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .ab-fig-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 4.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--yellow);
}

.page-about .ab-unit {
  font-size: .5em;
  margin-left: 2px;
}

.page-about .ab-fig-lbl {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: .02em;
}

.page-about .ab-hero-media {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

.page-about .ab-hero-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border: 2px solid var(--hair);
  box-shadow: var(--shadow-soft);
  background: var(--turf-2);
}

.page-about .ab-hero-media figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--muted);
  line-height: 1.6;
}

/* ---------- 起点 ---------- */
.page-about .ab-origin-grid {
  align-items: start;
  gap: clamp(22px, 4vw, 46px);
}

.page-about .ab-origin-main p {
  margin: 0 0 14px;
  color: var(--text);
  line-height: 1.8;
  max-width: 62ch;
}

.page-about .ab-note {
  padding: clamp(18px, 2.4vw, 26px);
  border: 3px solid var(--paper-ink);
  box-shadow: var(--ab-paper-shadow);
  transform: rotate(-0.4deg);
}

.page-about .ab-note-tag {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--orange);
  font-weight: 700;
}

.page-about .ab-note-text {
  margin: 0;
  color: var(--paper-ink);
  font-size: 14.5px;
  line-height: 1.75;
}

/* ---------- 时间带 ---------- */
.page-about .ab-tl {
  margin-top: clamp(24px, 4vw, 42px);
  position: relative;
}

.page-about .ab-node {
  position: relative;
  border-left: 2px dashed var(--line);
  margin-left: 10px;
  padding: 0 0 clamp(20px, 3vw, 30px) clamp(20px, 3vw, 30px);
}

.page-about .ab-node:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  transition: background-color .18s ease, transform .18s ease;
}

.page-about .ab-node[open]::before,
.page-about .ab-node:hover::before {
  background: var(--cyan);
  transform: scale(1.15);
}

.page-about .ab-node--now::before {
  border-color: var(--orange);
}
.page-about .ab-node--now[open]::before,
.page-about .ab-node--now:hover::before {
  background: var(--orange);
}

.page-about .ab-node-sum {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 12px;
  cursor: pointer;
  list-style: none;
  padding: 4px 0 6px;
  border-bottom: 1px solid var(--hair);
  transition: border-color .18s ease;
}

.page-about .ab-node-sum::-webkit-details-marker { display: none; }

.page-about .ab-node-sum:hover,
.page-about .ab-node-sum:focus-visible {
  border-bottom-color: var(--cyan);
  outline: none;
}

.page-about .ab-node-sum:focus-visible {
  box-shadow: 0 0 0 2px var(--cyan);
}

.page-about .ab-node-year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--ink);
  background: var(--cyan);
  padding: 3px 9px;
  white-space: nowrap;
}

.page-about .ab-node--now .ab-node-year {
  background: var(--orange);
  color: var(--ink);
}

.page-about .ab-node-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.6vw, 24px);
  color: var(--paper);
  letter-spacing: .01em;
}

.page-about .ab-node-hint {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: .12em;
}

.page-about .ab-node[open] .ab-node-hint { visibility: hidden; }

.page-about .ab-node-body {
  padding-top: 12px;
  max-width: 62ch;
}

.page-about .ab-node-body p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
  font-size: 14.5px;
}

/* ---------- 团队 ---------- */
.page-about .ab-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 46px);
  align-items: start;
}

.page-about .ab-team-copy p {
  margin: 0 0 14px;
  color: var(--text);
  line-height: 1.8;
  max-width: 62ch;
}

.page-about .ab-role-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: 2px solid var(--hair);
}

.page-about .ab-role-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 2px;
  border-bottom: 1px solid var(--hair);
}

.page-about .ab-role-name {
  font-size: 15px;
  color: var(--text);
}

.page-about .ab-role-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 19px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .ab-team-media {
  margin: 0;
  background: var(--turf-2);
  border: 3px solid var(--paper-ink);
  box-shadow: var(--ab-paper-shadow);
  padding: 10px 10px 0;
}

.page-about .ab-team-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 7;
  object-fit: cover;
  background: var(--turf);
}

.page-about .ab-team-media figcaption {
  padding: 10px 2px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--paper-ink);
}

/* ---------- 校验 ---------- */
.page-about .ab-check-list {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  counter-reset: none;
}

.page-about .ab-check-item {
  position: relative;
  padding: 22px 20px 20px;
  background: linear-gradient(150deg, var(--turf-2), var(--ink-2));
  border: 1px solid var(--line);
  border-left: 5px solid var(--orange);
}

.page-about .ab-check-idx {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--orange);
  margin-bottom: 8px;
}

.page-about .ab-check-item h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--paper);
  letter-spacing: .01em;
}

.page-about .ab-check-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .ab-quote {
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: clamp(20px, 3vw, 30px) clamp(20px, 3vw, 34px);
  background: var(--paper);
  border: 4px solid var(--paper-ink);
  box-shadow: 8px 8px 0 var(--ink-2);
}

.page-about .ab-quote p {
  margin: 0 0 12px;
  color: var(--paper-ink);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.4vw, 23px);
  line-height: 1.5;
}

.page-about .ab-quote-src {
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--paper-ink);
  opacity: .68;
}

/* ---------- 本地 ---------- */
.page-about .ab-local-grid {
  align-items: start;
  gap: clamp(22px, 4vw, 46px);
}

.page-about .ab-local-grid p {
  margin: 0 0 14px;
  color: var(--text);
  line-height: 1.8;
  max-width: 62ch;
}

.page-about .ab-local-panel {
  padding: clamp(18px, 2.4vw, 26px);
  border: 3px solid var(--paper-ink);
  box-shadow: var(--ab-paper-shadow);
}

.page-about .ab-local-list {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
}

.page-about .ab-local-list li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px dashed rgba(27, 21, 18, .28);
  color: var(--paper-ink);
  font-size: 14px;
}

.page-about .ab-local-list li:last-child { border-bottom: none; }

.page-about .ab-local-n {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 17px;
  color: var(--paper-ink);
  min-width: 34px;
}

.page-about .ab-local-foot {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--paper-ink);
  opacity: .82;
}

.page-about .ab-local-foot a {
  color: var(--paper-ink);
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-underline-offset: 3px;
}

.page-about .ab-local-foot a:hover,
.page-about .ab-local-foot a:focus-visible {
  background: var(--orange);
  color: var(--ink);
  text-decoration: none;
}

/* ---------- 旧版专区 ---------- */
.page-about .ab-legacy {
  border-top: 3px solid var(--ink-2);
  background:
    repeating-linear-gradient(135deg, rgba(63, 232, 206, .04) 0 10px, transparent 10px 20px),
    var(--ink-2);
}

.page-about .ab-legacy-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .ab-legacy-copy p {
  margin: 0 0 14px;
  color: var(--text);
  line-height: 1.8;
  max-width: 62ch;
}

.page-about .ab-legacy-copy a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .ab-legacy-copy a:hover,
.page-about .ab-legacy-copy a:focus-visible {
  background: var(--cyan);
  color: var(--ink);
  text-decoration: none;
}

.page-about .ab-legacy-media {
  margin: 0;
  padding: 10px 10px 0;
  background: var(--turf-2);
  border: 3px solid var(--yellow);
  box-shadow: 6px 6px 0 rgba(255, 226, 77, .28);
}

.page-about .ab-legacy-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  background: var(--turf);
}

.page-about .ab-legacy-media figcaption {
  padding: 10px 2px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .ab-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .ab-links .btn {
  font-family: var(--font-display);
  letter-spacing: .04em;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px;
  }

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

@media (min-width: 1024px) {
  .page-about .ab-node {
    padding-left: 34px;
    margin-left: 14px;
  }

  .page-about .ab-node-sum {
    grid-template-columns: var(--ab-year-col) 1fr auto;
    gap: 18px;
  }

  .page-about .ab-node-title {
    font-size: 26px;
  }

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

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

  .page-about .ab-legacy-media {
    margin-top: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-node::before,
  .page-about .ab-node-sum {
    transition: none;
  }
}