.page-about {
  --about-rule: rgba(154, 163, 156, .55);
  --about-rule-invert: rgba(244, 241, 233, .22);
  --about-year-w: 116px;
}

/* ---------- 滚动显现（渐进增强） ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about [data-reveal].is-in {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
}

.page-about .about-hero .crumbs {
  margin-bottom: clamp(24px, 4vw, 46px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-weight: 300;
  font-size: clamp(34px, 7vw, 74px);
  line-height: 1.02;
  letter-spacing: -.01em;
  color: var(--stone);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--stone);
}

.page-about .about-hero__keys {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 28px 0 0;
  padding: 18px 0 0;
  border-top: 1px dashed var(--line);
  font-size: 13px;
  color: var(--stone);
}

.page-about .about-hero__keys .mono {
  font-family: var(--f-mono);
  font-size: 16px;
  color: var(--clay);
  margin-right: 7px;
}

.page-about .about-hero__fig {
  margin: 0;
}

.page-about .about-hero__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: var(--bd);
  box-shadow: var(--shadow);
  background: var(--moss);
}

.page-about .about-hero__fig figcaption {
  margin-top: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--clay);
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
  }

  .page-about .about-hero__fig {
    margin-top: 8px;
  }
}

/* ---------- 01 范围 ---------- */
.page-about .about-scope {
  align-items: start;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 36px;
  background: var(--line);
  border-top: 2px solid var(--teal);
  border-bottom: 2px solid var(--teal);
}

.page-about .about-stats .stat {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 8px;
  padding: 18px 4px 20px;
  background: var(--warm);
}

.page-about .about-stats .stat__num {
  font-family: var(--f-mono);
  font-size: clamp(32px, 5vw, 46px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--teal);
}

.page-about .about-stats .stat__unit {
  font-size: 13px;
  color: var(--clay);
  letter-spacing: .04em;
}

.page-about .about-stats .stat__label {
  flex-basis: 100%;
  margin-top: 8px;
  font-size: 13px;
  color: var(--mist);
}

@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, 1fr);
  }
}

.page-about .about-scope__side .note {
  border-top: 2px solid var(--teal);
  padding-top: 16px;
}

/* ---------- 02 时间线 ---------- */
.page-about .about-tl .section__lede {
  max-width: 58ch;
}

.page-about .about-timeline {
  list-style: none;
  margin: clamp(32px, 5vw, 52px) 0 0;
  padding: 0;
  border-left: 1px solid var(--about-rule-invert);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 24px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 22px;
  width: 9px;
  height: 9px;
  background: var(--flare);
  box-shadow: 0 0 0 4px rgba(255, 106, 31, .16);
}

.page-about .about-node {
  border-bottom: 1px solid var(--about-rule-invert);
}

.page-about .about-node > summary {
  display: grid;
  grid-template-columns: 74px 1fr 14px;
  gap: 6px 14px;
  align-items: baseline;
  padding: 16px 0 18px;
  cursor: pointer;
  list-style: none;
  transition: color var(--dur) var(--ease);
}

.page-about .about-node > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-node > summary:hover {
  color: var(--flare);
}

.page-about .about-node__yr {
  font-family: var(--f-mono);
  font-size: clamp(17px, 2.6vw, 22px);
  font-weight: 500;
  letter-spacing: -.01em;
  color: var(--flare);
}

.page-about .about-node__title {
  font-size: clamp(16px, 2.2vw, 20px);
  font-weight: 400;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-node__mark {
  position: relative;
  width: 12px;
  height: 12px;
  border-right: 2px solid var(--mist);
  border-bottom: 2px solid var(--mist);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform var(--dur) var(--ease);
}

.page-about .about-node[open] .about-node__mark {
  transform: rotate(-135deg) translate(-4px, -4px);
}

.page-about .about-node__body {
  max-width: 66ch;
  padding: 0 0 20px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 241, 233, .76);
}

.page-about .about-node__body p {
  margin: 0;
}

@media (min-width: 860px) {
  .page-about .about-node > summary {
    grid-template-columns: var(--about-year-w) 1fr 16px;
    gap: 6px 24px;
    padding: 20px 0 22px;
  }

  .page-about .about-node__yr {
    font-size: clamp(22px, 2.4vw, 30px);
  }
}

/* ---------- 03 数据口径 ---------- */
.page-about .about-schema {
  align-items: start;
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
  background: var(--warm);
  border: var(--bd);
  box-shadow: var(--shadow);
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 13px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.page-about .about-table thead th {
  background: var(--teal);
  color: var(--paper);
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .16em;
  padding: 12px 14px;
  border-bottom: none;
}

.page-about .about-table tbody th {
  font-weight: 500;
  color: var(--teal);
  width: 34%;
}

.page-about .about-table tbody td {
  color: var(--stone);
  line-height: 1.7;
}

.page-about .about-table tbody tr {
  transition: background-color var(--dur) var(--ease);
}

.page-about .about-table tbody tr:hover {
  background: rgba(20, 82, 74, .08);
}

.page-about .about-table tbody tr:last-child th,
.page-about .about-table tbody tr:last-child td {
  border-bottom: none;
}

@media (min-width: 620px) {
  .page-about .about-table tbody th {
    white-space: nowrap;
  }
}

.page-about .about-schema__fig {
  margin: 0 0 20px;
}

.page-about .about-schema__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: var(--bd);
  background: var(--moss);
}

.page-about .about-refresh {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(30px, 4vw, 48px);
  background: var(--teal);
  border: var(--bd);
  box-shadow: var(--shadow);
}

.page-about .about-refresh__item {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px;
  background: var(--moss);
}

.page-about .about-refresh__k {
  color: rgba(244, 241, 233, .68);
}

.page-about .about-refresh__v {
  font-family: var(--f-mono);
  font-size: clamp(19px, 2.6vw, 26px);
  font-weight: 500;
  letter-spacing: -.01em;
  color: var(--flare);
}

@media (min-width: 760px) {
  .page-about .about-refresh {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ---------- 04 团队 ---------- */
.page-about .about-team__grid {
  align-items: start;
}

.page-about .about-team .section__lede {
  max-width: 58ch;
  color: rgba(244, 241, 233, .8);
}

.page-about .about-roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 30px;
}

.page-about .about-role {
  position: relative;
  padding: 18px 18px 20px;
  background: var(--warm);
  border: var(--bd);
  box-shadow: var(--shadow);
}

.page-about .about-role__idx {
  display: block;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--clay);
  margin-bottom: 12px;
}

.page-about .about-role h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--teal);
}

.page-about .about-role p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(43, 46, 44, .84);
}

@media (min-width: 620px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, 1fr);
  }
}

.page-about .about-team__side {
  display: grid;
  gap: 20px;
}

.page-about .about-team__fig {
  margin: 0;
}

.page-about .about-team__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: var(--bd-dark);
  box-shadow: var(--shadow-soft);
  background: var(--warm);
}

.page-about .about-team__note {
  border-top: 2px solid var(--flare);
  padding-top: 16px;
  color: rgba(244, 241, 233, .82);
}

.page-about .about-team__note p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.72;
}

/* ---------- 05 来源与边界 ---------- */
.page-about .about-tl + .section .prose,
.page-about .prose {
  margin-top: 26px;
}

/* ---------- 06 联络 ---------- */
.page-about .about-contact {
  background: var(--night);
}

.page-about .about-contact__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-about .about-contact__lede {
  max-width: 58ch;
  margin: 20px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(244, 241, 233, .78);
}

.page-about .about-contact__card {
  padding: 22px;
  border: var(--bd-invert);
  background: rgba(244, 241, 233, .04);
}

.page-about .about-contact__card dl {
  margin: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-contact__card dt {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--mist);
}

.page-about .about-contact__card dd {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.page-about .about-contact__card dd.mono {
  font-family: var(--f-mono);
  font-size: 17px;
  letter-spacing: .02em;
  color: var(--flare);
}

.page-about .about-contact__note {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px dashed var(--line-invert);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

@media (min-width: 880px) {
  .page-about .about-contact__grid {
    grid-template-columns: 7fr 5fr;
  }
}