.page-about {
  --about-line: rgba(201, 162, 39, 0.55);
  --about-soft: rgba(169, 138, 209, 0.32);
  --about-body-ink: #40342b;
  --about-body-ink-soft: #5f5145;
  background: var(--ink-deep);
  color: var(--ink-text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  background: var(--paper);
  padding: 20px 16px 48px;
}

.page-about .about-hero .breadcrumb {
  margin: 0 auto 18px;
  max-width: 1120px;
}

.page-about .about-hero__frame {
  position: relative;
  max-width: 1120px;
  margin: 0 auto;
  padding: 40px 18px 34px;
  border: 1px solid var(--paper-shade);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.6), rgba(255, 255, 255, 0) 70%),
    var(--paper);
}

.page-about .about-hero__corner {
  position: absolute;
  width: 26px;
  height: 26px;
  border: 2px solid var(--gold);
}

.page-about .about-hero__corner--tl {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero__corner--br {
  right: -1px;
  bottom: -1px;
  border-top: 0;
  border-left: 0;
}

.page-about .about-hero__side {
  margin: 0 0 16px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: #8a6fb0;
}

.page-about .about-hero__title {
  margin: 10px 0 18px;
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(30px, 7.4vw, 62px);
  line-height: 1.14;
  letter-spacing: 0.01em;
  color: var(--ink-text);
}

.page-about .about-hero__lead {
  max-width: 34em;
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-body-ink);
}

.page-about .about-hero__stats {
  margin: 32px 0 0;
  border-top: 1px dotted var(--paper-shade);
}

.page-about .about-hero__stats > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px dotted var(--paper-shade);
}

.page-about .about-hero__stats dt {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--about-body-ink-soft);
}

.page-about .about-hero__stats dd {
  margin: 0;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 22px;
  color: var(--grape);
}

/* ---------- 章节标题组 ---------- */
.page-about .about-head {
  max-width: 46em;
  margin: 0 0 26px;
}

.page-about .about-head h2 {
  margin: 10px 0 12px;
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(23px, 5vw, 38px);
  line-height: 1.26;
  color: var(--ink-text);
}

.page-about .about-head__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-body-ink-soft);
}

.page-about .about-head--ink h2 {
  color: var(--paper);
}

.page-about .about-head--ink .kicker {
  color: var(--gold);
}

.page-about .about-head--ink .about-head__note {
  color: var(--grape-mist);
}

.page-about .about-head__note .mono {
  color: var(--gold);
  font-size: 15px;
}

/* ---------- 沿革时间轴 ---------- */
.page-about .about-timeline,
.page-about .about-cards,
.page-about .about-sort,
.page-about .about-caliber,
.page-about .about-team {
  padding: 54px 16px;
}

.page-about .about-timeline {
  position: relative;
  overflow: hidden;
  background: var(--ink-deep);
}

.page-about .about-timeline__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
  filter: saturate(0.75);
}

.page-about .about-timeline::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(27, 16, 38, 0.94), rgba(27, 16, 38, 0.76) 48%, #1b1026);
}

.page-about .about-timeline__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 34px;
  padding: 10px;
}

.page-about .about-jump__link {
  flex: 1 1 100%;
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 11px 13px;
  border-left: 2px solid var(--about-line);
  background: rgba(107, 63, 160, 0.18);
  color: var(--paper);
  font-size: 13px;
  text-decoration: none;
  transition: background var(--t-fast) var(--ease);
}

.page-about .about-jump__link:hover,
.page-about .about-jump__link:focus-visible {
  background: rgba(107, 63, 160, 0.46);
}

.page-about .about-jump__link .mono {
  flex: 0 0 auto;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .about-tl {
  position: relative;
  margin: 0;
  padding: 0 0 0 24px;
  list-style: none;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), rgba(201, 162, 39, 0.12));
}

.page-about .about-tl__item {
  position: relative;
  padding: 0 0 38px 6px;
}

.page-about .about-tl__item:last-child {
  padding-bottom: 4px;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-deep);
  border: 2px solid var(--gold);
}

.page-about .about-tl__year {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .about-tl__code {
  display: inline-block;
  margin: 0 0 10px;
  padding: 2px 9px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ink-deep);
  background: var(--gold);
}

.page-about .about-tl__title {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.42;
  color: var(--paper);
}

.page-about .about-tl__text {
  max-width: 40em;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.88;
  color: rgba(243, 234, 221, 0.72);
}

/* ---------- 编号卡组 ---------- */
.page-about .about-cards {
  background: var(--paper);
}

.page-about .about-cards__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-cards__fig {
  margin: 22px 0 0;
}

.page-about .about-seal {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-seal__item {
  position: relative;
  padding: 26px 18px 18px;
  border: 1px solid var(--paper-shade);
  border-top: 3px solid var(--gold);
  background: linear-gradient(180deg, #fbf5ec, #f1e7da);
  box-shadow: 0 12px 24px -22px rgba(27, 16, 38, 0.75);
}

.page-about .about-seal__tab {
  position: absolute;
  top: -1px;
  right: 14px;
  padding: 3px 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--paper);
  background: var(--grape);
}

.page-about .about-seal__code {
  display: inline-block;
  margin: 0 0 12px;
  padding: 3px 9px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--grape);
  background: rgba(107, 63, 160, 0.1);
}

.page-about .about-seal__title {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.4;
  color: var(--ink-text);
}

.page-about .about-seal__meta {
  margin: 0 0 12px;
  font-size: 13px;
  color: var(--about-body-ink-soft);
}

.page-about .about-seal__meta .mono {
  font-size: 14px;
  font-weight: 600;
  color: var(--jade);
}

.page-about .about-seal__body {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-body-ink);
}

.page-about .about-seal__copy {
  margin-top: 16px;
  padding: 6px 11px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--about-body-ink-soft);
  background: transparent;
  border: 1px dashed var(--paper-shade);
  cursor: pointer;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .about-seal__copy:hover,
.page-about .about-seal__copy:focus-visible {
  color: var(--grape);
  border-color: var(--grape);
}

.page-about .about-seal__copy[data-copied] {
  color: var(--jade);
  border-color: var(--jade);
}

/* ---------- 三类归档 ---------- */
.page-about .about-sort {
  background: var(--night-vine);
}

.page-about .about-sort__tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 18px;
}

.page-about .about-sort__tablist .tab {
  padding: 10px 16px;
  font-family: var(--sans);
  font-size: 14px;
  color: var(--grape-mist);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--about-soft);
  cursor: pointer;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .about-sort__tablist .tab:hover,
.page-about .about-sort__tablist .tab:focus-visible {
  border-color: var(--gold);
  color: var(--paper);
}

.page-about .about-sort__tablist .tab[aria-selected="true"] {
  color: var(--paper);
  background: var(--grape);
  border-color: var(--grape);
}

.page-about .about-sort__panel {
  padding: 22px 18px;
  border-left: 2px solid var(--gold);
}

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

.page-about .about-sort__q {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.5;
  color: var(--gold);
}

.page-about .about-sort__panel p {
  max-width: 40em;
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.88;
  color: rgba(243, 234, 221, 0.78);
}

.page-about .about-sort__ex {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px dotted rgba(201, 162, 39, 0.4);
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.9;
  letter-spacing: 0.02em;
  color: var(--jade-light);
}

/* ---------- 口径声明 ---------- */
.page-about .about-caliber {
  background: var(--paper);
}

.page-about .about-caliber__prose {
  margin-bottom: 26px;
}

.page-about .about-caliber__list {
  margin: 0 0 26px;
  border-top: 1px solid var(--paper-shade);
}

.page-about .about-caliber__list > div {
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--paper-shade);
}

.page-about .about-caliber__list dt {
  padding-top: 3px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--grape);
}

.page-about .about-caliber__list dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-body-ink);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--ink-deep);
}

.page-about .about-team__body {
  display: grid;
  gap: 24px;
}

.page-about .about-team__table {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-team__tbl {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  color: var(--paper);
  font-size: 14px;
}

.page-about .about-team__cap {
  padding-bottom: 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-align: left;
  color: var(--grape-mist);
}

.page-about .about-team__tbl th,
.page-about .about-team__tbl td {
  padding: 13px 10px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--about-soft);
}

.page-about .about-team__tbl thead th {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--grape-mist);
  border-bottom-color: var(--about-line);
}

.page-about .about-team__tbl tbody th {
  font-family: var(--serif);
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
  color: var(--paper);
}

.page-about .about-team__tbl td.num {
  width: 76px;
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 600;
  color: var(--gold);
}

.page-about .about-team__tbl td:last-child {
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(243, 234, 221, 0.7);
}

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

.page-about .about-team .rule {
  margin: 34px 0 22px;
}

.page-about .about-next {
  display: grid;
  gap: 10px;
}

.page-about .about-next__link {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 16px;
  padding: 14px 16px;
  border: 1px solid var(--about-soft);
  color: var(--paper);
  font-size: 14px;
  text-decoration: none;
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: rgba(107, 63, 160, 0.24);
  border-color: var(--gold);
}

.page-about .about-next__link .mono {
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 26px 24px 60px;
  }

  .page-about .about-hero__frame {
    padding: 46px 32px 42px;
  }

  .page-about .about-jump__link {
    flex: 1 1 44%;
  }

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

  .page-about .about-caliber__list > div {
    grid-template-columns: 120px 1fr;
  }
}

@media (min-width: 700px) {
  .page-about .about-seal {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-timeline,
  .page-about .about-cards,
  .page-about .about-sort,
  .page-about .about-caliber,
  .page-about .about-team {
    padding: 92px 32px;
  }

  .page-about .about-hero__side {
    position: absolute;
    top: 56px;
    right: 22px;
    margin: 0;
    writing-mode: vertical-rl;
  }

  .page-about .about-hero__frame {
    padding: 62px 92px 54px 46px;
  }

  .page-about .about-hero__stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-bottom: 1px dotted var(--paper-shade);
  }

  .page-about .about-hero__stats > div {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 18px 20px;
    border-bottom: 0;
    border-right: 1px dotted var(--paper-shade);
  }

  .page-about .about-hero__stats > div:last-child {
    border-right: 0;
  }

  .page-about .about-hero__stats dd {
    font-size: 32px;
  }

  .page-about .about-tl__item {
    display: grid;
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 0 28px;
    padding-bottom: 44px;
  }

  .page-about .about-tl__year {
    grid-column: 1;
    margin-top: 3px;
  }

  .page-about .about-tl__body {
    grid-column: 2;
  }
}

@media (min-width: 1000px) {
  .page-about .about-cards__grid {
    grid-template-columns: 340px minmax(0, 1fr);
    gap: 46px;
    align-items: start;
  }

  .page-about .about-team__body {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 34px;
    align-items: start;
  }
}

@media (min-width: 1240px) {
  .page-about .about-seal {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-jump__link,
  .page-about .about-seal__copy,
  .page-about .about-sort__tablist .tab,
  .page-about .about-next__link {
    transition: none;
  }
}