.page-about {
  --tl-pad: clamp(22px, 3.4vw, 36px);
  --plate-pad: clamp(24px, 3.6vw, 48px);
  overflow-wrap: break-word;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding-block: clamp(14px, 2vw, 24px);
}

/* ---------- 首屏 ---------- */
.page-about .masthead {
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
  padding-bottom: clamp(32px, 5vw, 64px);
}

.page-about .masthead-title {
  font-size: var(--fs-h1);
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin: 0 0 clamp(14px, 2vw, 24px);
  transform: scaleY(0.94);
  transform-origin: left top;
}

.page-about .masthead .lede {
  max-width: 54ch;
  margin: 0;
}

.page-about .figure--hero {
  margin: 0;
}

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

@media (min-width: 1000px) {
  .page-about .masthead {
    grid-template-columns: minmax(0, 0.94fr) minmax(0, 1.06fr);
    align-items: center;
    gap: clamp(32px, 4.5vw, 72px);
    padding-block: clamp(18px, 3vw, 40px) clamp(48px, 6vw, 92px);
  }
}

/* ---------- 两栏账册骨架 ---------- */
.page-about .ledger {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  padding-block: clamp(36px, 5vw, 76px) clamp(48px, 7vw, 110px);
}

@media (min-width: 1040px) {
  .page-about .ledger {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(40px, 6vw, 96px);
  }
}

/* ---------- 楼层指示牌 ---------- */
.page-about .floor-index-title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--stone);
  text-transform: uppercase;
}

.page-about .floor-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  border-top: 1px solid var(--line-soft);
  padding-top: 14px;
}

.page-about .floor-link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 6px 0;
  font-size: 14px;
  line-height: 1.5;
  color: var(--stone);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color var(--t-fast) ease, border-color var(--t-fast) ease, padding-left var(--t-fast) ease;
}

.page-about .floor-link:hover,
.page-about .floor-link:focus-visible {
  color: var(--copper-bright);
  border-left-color: var(--copper);
  padding-left: 8px;
}

.page-about .floor-num {
  font-size: 11px;
  color: var(--copper);
  letter-spacing: 0.1em;
}

@media (min-width: 1040px) {
  .page-about .floor-index {
    position: sticky;
    top: clamp(120px, 17vh, 180px);
    align-self: start;
  }

  .page-about .floor-index-list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
  }

  .page-about .floor-link {
    padding: 8px 0 8px 0;
  }
}

/* ---------- 章节 ---------- */
.page-about .chapter {
  padding-block: clamp(30px, 4.6vw, 62px);
  border-top: 1px solid var(--line-soft);
}

.page-about .ledger-body > .chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .chapter-head {
  margin-bottom: clamp(16px, 2.4vw, 28px);
}

.page-about .chapter-title {
  font-size: var(--fs-h2);
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: 14px 0 0;
  transform: scaleY(0.94);
  transform-origin: left top;
}

.page-about .chapter-body {
  max-width: 68ch;
}

.page-about .chapter-body p,
.page-about .chapter-intro,
.page-about .chapter-note,
.page-about .timeline-text,
.page-about .crew-card p {
  color: var(--silver);
  line-height: 1.75;
  font-size: var(--fs-body);
}

.page-about .chapter-body p {
  margin: 0 0 1.15em;
}

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

.page-about .chapter-intro {
  max-width: 62ch;
  margin: 0 0 clamp(22px, 3vw, 38px);
}

.page-about .chapter-note {
  margin: clamp(24px, 3.2vw, 40px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--copper);
  max-width: 60ch;
  color: var(--cream);
}

.page-about .chapter-body a,
.page-about .chapter-note a {
  color: var(--copper-bright);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

.page-about .chapter-body a:hover,
.page-about .chapter-note a:hover {
  color: var(--cream);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 4px 0 0 var(--tl-pad);
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--copper) 0%, rgba(201, 146, 74, 0.28) 55%, rgba(201, 146, 74, 0) 100%);
}

.page-about .timeline-item {
  position: relative;
  padding-bottom: clamp(26px, 3.4vw, 46px);
}

.page-about .timeline-item:last-child {
  padding-bottom: 0;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: calc(var(--tl-pad) * -1 + 1px);
  top: 9px;
  width: 9px;
  height: 9px;
  background: var(--copper);
  box-shadow: 0 0 0 4px rgba(201, 146, 74, 0.14);
  transition: box-shadow var(--t-fast) ease;
}

.page-about .timeline-item:hover::before {
  box-shadow: 0 0 0 6px rgba(201, 146, 74, 0.24);
}

.page-about .timeline-item--figure::before {
  display: none;
}

.page-about .timeline-year {
  margin: 0 0 6px;
  font-size: clamp(20px, 2.4vw, 28px);
  line-height: 1;
  letter-spacing: 0.08em;
  color: var(--copper);
}

.page-about .timeline-head {
  margin: 0 0 8px;
  font-size: var(--fs-h3);
  line-height: 1.35;
  color: var(--cream);
  transform: scaleY(0.94);
  transform-origin: left top;
}

.page-about .timeline-text {
  margin: 0;
  max-width: 58ch;
}

.page-about .timeline .figure {
  margin: 0;
}

.page-about .figure {
  margin: 0;
  border: 1px solid var(--line-soft);
  background: var(--ink-2);
}

.page-about .figure-cap {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 三组人 ---------- */
.page-about .crew {
  display: grid;
  gap: var(--gap);
  margin-bottom: clamp(26px, 3.6vw, 44px);
}

.page-about .crew-card {
  padding: clamp(18px, 2.4vw, 28px);
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--copper);
  background: linear-gradient(180deg, rgba(46, 92, 78, 0.28) 0%, rgba(14, 21, 18, 0) 100%);
  transition: transform var(--t-mid) ease, border-color var(--t-mid) ease;
}

.page-about .crew-card:hover {
  transform: translateY(-4px);
  border-color: var(--line);
}

.page-about .crew-tag {
  margin: 0 0 12px;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--copper);
}

.page-about .crew-head {
  margin: 0 0 10px;
  font-size: var(--fs-h3);
  line-height: 1.35;
  color: var(--cream);
  transform: scaleY(0.94);
  transform-origin: left top;
}

.page-about .crew-card p:last-child {
  margin: 0;
}

@media (min-width: 880px) {
  .page-about .crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    gap: clamp(18px, 2.4vw, 32px);
    margin-bottom: clamp(36px, 4.6vw, 64px);
  }

  .page-about .crew-card:nth-child(2) {
    margin-top: clamp(20px, 3vw, 40px);
  }

  .page-about .crew-card:nth-child(3) {
    margin-top: clamp(40px, 6vw, 82px);
  }
}

/* ---------- 青铜展区 ---------- */
.page-about .chapter--plate {
  border-top: 1px solid rgba(201, 146, 74, 0.4);
  background: linear-gradient(165deg, var(--bronze) 0%, #1d3b32 100%);
  padding: var(--plate-pad);
  margin-block: clamp(20px, 3vw, 40px);
}

.page-about .chapter--plate .chapter-title,
.page-about .placard--onPlate {
  color: var(--cream);
}

.page-about .placard--onPlate .placard-num {
  color: var(--copper-bright);
}

.page-about .plate-stats {
  list-style: none;
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2vw, 24px);
  border-top: 1px solid rgba(242, 232, 216, 0.22);
  padding-top: clamp(20px, 2.6vw, 30px);
}

@media (min-width: 720px) {
  .page-about .plate-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .plate-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .plate-num {
  display: block;
  font-size: clamp(28px, 3.4vw, 44px);
  line-height: 1;
  color: var(--copper-bright);
  letter-spacing: 0.02em;
}

.page-about .plate-num--sm {
  font-size: clamp(20px, 2.2vw, 30px);
}

.page-about .plate-label {
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(242, 232, 216, 0.82);
}

/* ---------- 登记与备案 ---------- */
.page-about .chapter--cred {
  border-top: 0;
  background: var(--cream);
  color: var(--ink);
  padding: var(--plate-pad);
  margin-top: clamp(20px, 3vw, 36px);
}

.page-about .chapter--cred .chapter-title,
.page-about .placard--dark {
  color: var(--ink);
}

.page-about .placard--dark .placard-num {
  color: var(--bronze);
}

.page-about .cred-list {
  margin: clamp(18px, 2.6vw, 30px) 0 0;
  padding: 0;
  border-top: 1px solid rgba(14, 21, 18, 0.16);
}

.page-about .cred-row {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(14, 21, 18, 0.12);
}

@media (min-width: 640px) {
  .page-about .cred-row {
    grid-template-columns: 132px minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
  }
}

.page-about .cred-row dt {
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: rgba(14, 21, 18, 0.55);
}

.page-about .cred-row dd {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--ink);
  font-weight: 500;
}

.page-about .cred-note {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(14, 21, 18, 0.78);
}

.page-about .cred-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin: clamp(16px, 2.2vw, 24px) 0 0;
}

.page-about .cred-links a {
  color: var(--bronze);
  font-size: 15px;
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

.page-about .cred-links a:hover {
  color: var(--neon);
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .crew-card {
    transition: none;
  }

  .page-about .crew-card:hover {
    transform: none;
  }

  .page-about .floor-link {
    transition: none;
  }
}