.page-about {
  --about-card-pad: 24px;
  --about-gap: 40px;
}

.page-about .shell {
  position: relative;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 32px 0 0;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: start;
}

.page-about .about-hero__narrative {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: var(--fs-13);
  color: var(--gold);
  letter-spacing: 0.04em;
}

.page-about .breadcrumb a {
  color: var(--paper-2);
  text-decoration: none;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--gold-bright);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .about-hero__eyebrow {
  color: var(--gold);
}

.page-about .about-hero__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: var(--fs-36);
  line-height: 1.22;
  letter-spacing: 0.02em;
  color: var(--paper);
  margin: 0;
}

.page-about .about-hero__lede {
  max-width: 62ch;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--text-light);
  margin: 0;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 6px;
}

.page-about .about-hero__facts .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: linear-gradient(150deg, var(--felt-2) 0%, rgba(28, 58, 43, 0.35) 100%);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  border-left: 2px solid var(--gold);
}

.page-about .about-hero__facts .stat__value {
  font-size: var(--fs-22);
  color: var(--gold-bright);
  letter-spacing: 0.04em;
}

.page-about .about-hero__facts .stat__label {
  font-size: var(--fs-13);
  color: var(--paper-2);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

.page-about .about-hero__visual {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-hero__frame {
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--felt);
  box-shadow: 0 24px 60px rgba(10, 13, 11, 0.55);
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 20%, rgba(201, 164, 92, 0.16), transparent 60%);
  pointer-events: none;
}

.page-about .about-hero__frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-hero__caption {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 4px;
}

.page-about .about-hero__caption .annot {
  color: var(--paper-2);
}

.page-about .about-hero__rule {
  margin: 48px 0 0;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding: 72px 0 56px;
}

.page-about .about-timeline__head .sec-head__title {
  font-family: var(--font-serif);
  font-size: var(--fs-28);
  line-height: 1.3;
  color: var(--paper);
  margin: 6px 0 10px;
}

.page-about .about-timeline__head .sec-head__note {
  color: var(--paper-2);
  font-size: var(--fs-16);
  max-width: 56ch;
  margin: 0;
}

.page-about .about-tl {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 11px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--line) 55%, transparent 100%);
  opacity: 0.75;
}

.page-about .about-tl__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  padding-bottom: 40px;
}

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

.page-about .about-tl__marker {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-left: 0;
}

.page-about .about-tl__dot {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--gold);
  box-shadow: 0 0 0 6px rgba(201, 164, 92, 0.12);
  flex: none;
  position: relative;
  left: 0;
}

.page-about .about-tl__dot::after {
  content: "";
  position: absolute;
  inset: 6px;
  border-radius: 50%;
  background: var(--gold);
  opacity: 0.9;
}

.page-about .about-tl__marker-num {
  font-size: var(--fs-18);
  color: var(--gold);
  letter-spacing: 0.08em;
}

.page-about .about-tl__body.card {
  padding: var(--about-card-pad);
  background: var(--felt);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  border-left: 3px solid var(--felt-2);
}

.page-about .about-tl__body h3 {
  font-family: var(--font-serif);
  font-size: var(--fs-22);
  font-weight: 600;
  color: var(--paper);
  margin: 6px 0 12px;
  line-height: 1.35;
}

.page-about .about-tl__body p {
  color: var(--text-light);
  font-size: var(--fs-16);
  line-height: 1.85;
  margin: 0 0 12px;
}

.page-about .about-tl__body .card__eyebrow {
  color: var(--gold);
  font-size: var(--fs-13);
  letter-spacing: 0.06em;
  margin: 0;
}

.page-about .about-tl__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
}

.page-about .about-tl__chips .chip {
  border: 1px solid var(--line);
  background: rgba(28, 58, 43, 0.5);
  color: var(--paper-2);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: var(--fs-13);
}

.page-about .about-tl__figure {
  margin-top: 18px;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .about-tl__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-tl__figure .media-frame__caption {
  padding: 10px 14px;
  font-size: var(--fs-12);
  color: var(--paper-2);
  background: rgba(10, 13, 11, 0.6);
  margin: 0;
}

/* ---------- 六个分类 ---------- */
.page-about .about-cats {
  padding: 56px 0 64px;
  background: linear-gradient(180deg, rgba(18, 37, 28, 0.35) 0%, transparent 100%);
}

.page-about .about-cats__head .sec-head__title {
  font-family: var(--font-serif);
  font-size: var(--fs-28);
  color: var(--paper);
  margin: 6px 0 10px;
  line-height: 1.3;
}

.page-about .about-cats__head .sec-head__note {
  color: var(--paper-2);
  font-size: var(--fs-16);
  margin: 0;
  max-width: 58ch;
}

.page-about .about-cats__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 32px;
}

.page-about .about-cats__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .about-cats__tab {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  width: 100%;
  text-align: left;
  padding: 14px 16px;
  background: rgba(10, 13, 11, 0.65);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  color: var(--paper-2);
  font-family: var(--font-sans);
  font-size: var(--fs-16);
  cursor: pointer;
  transition: border-color 220ms var(--ease), background 220ms var(--ease), color 220ms var(--ease);
}

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

.page-about .about-cats__tab.is-active {
  background: linear-gradient(135deg, rgba(28, 58, 43, 0.95) 0%, rgba(10, 13, 11, 0.92) 100%);
  border-color: var(--gold);
  color: var(--paper);
}

.page-about .about-cats__idx {
  font-size: var(--fs-13);
  color: var(--gold);
  letter-spacing: 0.08em;
}

.page-about .about-cats__name {
  font-family: var(--font-serif);
  font-size: var(--fs-18);
  font-weight: 600;
}

.page-about .about-cats__tag {
  font-size: var(--fs-12);
  color: var(--gold-bright);
  border: 1px solid rgba(201, 164, 92, 0.4);
  border-radius: 999px;
  padding: 3px 10px;
  white-space: nowrap;
}

.page-about .about-cats__panels {
  position: relative;
}

.page-about .about-cats__panel.card {
  padding: 24px;
  background: var(--paper);
  color: var(--text-dark);
  border: 1px solid var(--paper-2);
  border-radius: var(--r-md);
  border-top: 3px solid var(--gold);
}

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

.page-about .about-cats__panel h3 {
  font-family: var(--font-serif);
  font-size: var(--fs-22);
  color: var(--text-dark);
  margin: 0 0 12px;
}

.page-about .about-cats__panel > p {
  font-size: var(--fs-16);
  line-height: 1.85;
  margin: 0 0 18px;
  color: #33291f;
}

.page-about .about-cats__spec {
  margin: 0;
  display: grid;
  gap: 10px;
  border-top: 1px dashed var(--paper-2);
  padding-top: 16px;
}

.page-about .about-cats__spec > div {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 12px;
  align-items: baseline;
}

.page-about .about-cats__spec dt {
  font-size: var(--fs-13);
  color: var(--cinnabar);
  letter-spacing: 0.04em;
  font-weight: 600;
}

.page-about .about-cats__spec dd {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.7;
  color: #33291f;
}

/* ---------- 团队与线路 ---------- */
.page-about .about-ops {
  padding: 64px 0;
}

.page-about .about-ops__head .sec-head__title {
  font-family: var(--font-serif);
  font-size: var(--fs-28);
  color: var(--paper);
  margin: 6px 0 10px;
  line-height: 1.3;
}

.page-about .about-ops__head .sec-head__note {
  color: var(--paper-2);
  font-size: var(--fs-16);
  margin: 0;
}

.page-about .about-ops__figure {
  margin: 32px 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  position: relative;
}

.page-about .about-ops__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(10, 13, 11, 0.55) 0%, transparent 45%);
  pointer-events: none;
}

.page-about .about-ops__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-ops__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-ops__team.card {
  padding: var(--about-card-pad);
  background: radial-gradient(circle at 12% 0%, rgba(28, 58, 43, 0.9) 0%, var(--felt) 70%);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
}

.page-about .about-ops__team .card__eyebrow {
  color: var(--gold);
  font-size: var(--fs-13);
  letter-spacing: 0.06em;
  margin: 0;
}

.page-about .about-ops__count {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 12px 0 10px;
  color: var(--gold-bright);
}

.page-about .about-ops__count .mono {
  font-size: var(--fs-48);
  letter-spacing: 0.04em;
  line-height: 1;
}

.page-about .about-ops__unit {
  font-size: var(--fs-18);
  color: var(--paper-2);
}

.page-about .about-ops__desc {
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--text-light);
  margin: 0 0 18px;
}

.page-about .about-ops__nodes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.page-about .about-ops__node {
  display: grid;
  gap: 4px;
  padding: 10px 12px;
  border-left: 2px solid var(--felt-2);
  background: rgba(10, 13, 11, 0.4);
  border-radius: 0 var(--r-xs) var(--r-xs) 0;
  cursor: default;
  transition: border-color 220ms var(--ease), background 220ms var(--ease);
}

.page-about .about-ops__node:hover,
.page-about .about-ops__node:focus-visible {
  border-left-color: var(--gold);
  background: rgba(28, 58, 43, 0.7);
  outline: none;
}

.page-about .about-ops__node-k {
  font-family: var(--font-serif);
  font-size: var(--fs-16);
  color: var(--paper);
  font-weight: 600;
}

.page-about .about-ops__node-v {
  font-size: var(--fs-13);
  color: var(--paper-2);
  line-height: 1.7;
}

.page-about .about-ops__team--wide {
  background: linear-gradient(120deg, rgba(18, 37, 28, 0.95) 0%, rgba(10, 13, 11, 0.95) 100%);
}

.page-about .about-ops__stats {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-ops__stats li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-ops__stats li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-ops__stats .mono {
  font-size: var(--fs-28);
  color: var(--gold-bright);
  letter-spacing: 0.04em;
  min-width: 2.2ch;
}

.page-about .about-ops__stats span:last-child {
  font-size: var(--fs-16);
  color: var(--text-light);
  line-height: 1.7;
}

/* ---------- 归档 ---------- */
.page-about .about-archive {
  padding: 56px 0 64px;
  background: linear-gradient(180deg, transparent 0%, rgba(18, 37, 28, 0.5) 100%);
}

.page-about .about-archive__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

.page-about .about-archive__lead .eyebrow {
  color: var(--gold);
}

.page-about .about-archive__lead .sec-head__title {
  font-family: var(--font-serif);
  font-size: var(--fs-28);
  color: var(--paper);
  line-height: 1.32;
  margin: 6px 0 16px;
}

.page-about .about-archive__note {
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--text-light);
  margin: 0 0 14px;
  max-width: 58ch;
}

.page-about .about-archive__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-archive__meter {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 12px;
}

.page-about .about-archive__meter svg {
  width: 100%;
  max-width: 260px;
  height: auto;
}

.page-about .about-archive__meter .arc {
  fill: none;
  stroke-width: 3;
}

.page-about .about-archive__meter .arc--bg {
  stroke: var(--line);
}

.page-about .about-archive__meter .arc--gold {
  stroke: var(--gold);
  stroke-dasharray: 400 604;
  stroke-linecap: round;
}

.page-about .about-archive__meter .arc--cyan {
  stroke: var(--cyan);
  stroke-width: 1.5;
  stroke-dasharray: 6 10;
  opacity: 0.7;
}

.page-about .about-archive__meter .tick {
  stroke: var(--paper-2);
  stroke-width: 1.5;
  opacity: 0.55;
}

.page-about .about-archive__meter .mark {
  font-family: var(--font-mono);
  font-size: 30px;
  fill: var(--gold-bright);
  letter-spacing: 0.04em;
}

.page-about .about-archive__meter .mark-sub {
  font-family: var(--font-sans);
  font-size: 13px;
  fill: var(--paper-2);
}

.page-about .about-archive__meter .annot--rotate {
  color: var(--paper-2);
}

/* ---------- 衡量 ---------- */
.page-about .about-metrics {
  padding: 64px 0;
}

.page-about .about-metrics__head .sec-head__title {
  font-family: var(--font-serif);
  font-size: var(--fs-28);
  color: var(--paper);
  margin: 6px 0 10px;
  line-height: 1.3;
}

.page-about .about-metrics__head .sec-head__note {
  color: var(--paper-2);
  font-size: var(--fs-16);
  margin: 0;
}

.page-about .about-metrics__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 32px;
}

.page-about .about-metrics__cell.card--flat {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(10, 13, 11, 0.6);
  border-bottom: 3px solid var(--gold);
}

.page-about .about-metrics__num {
  font-size: var(--fs-48);
  color: var(--gold-bright);
  letter-spacing: 0.04em;
  line-height: 1;
  margin: 0 0 12px;
}

.page-about .about-metrics__num small {
  font-size: var(--fs-18);
  margin-left: 4px;
  color: var(--gold);
}

.page-about .about-metrics__cell h3 {
  font-family: var(--font-serif);
  font-size: var(--fs-18);
  color: var(--paper);
  margin: 0 0 10px;
  font-weight: 600;
}

.page-about .about-metrics__cell p {
  font-size: var(--fs-13);
  line-height: 1.8;
  color: var(--paper-2);
  margin: 0;
}

/* ---------- 结论 ---------- */
.page-about .about-closing {
  padding: 32px 0 80px;
}

.page-about .about-closing__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
  padding: 32px 24px;
  border-radius: var(--r-lg);
  background: linear-gradient(130deg, var(--felt-2) 0%, var(--ink) 78%);
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}

.page-about .about-closing__inner::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -10%;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(201, 164, 92, 0.18) 0%, transparent 70%);
  pointer-events: none;
}

.page-about .about-closing__title {
  font-family: var(--font-serif);
  font-size: var(--fs-22);
  line-height: 1.45;
  color: var(--paper);
  margin: 0 0 16px;
  font-weight: 600;
}

.page-about .about-closing__text p {
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--text-light);
  margin: 0;
  max-width: 62ch;
}

.page-about .about-closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-closing__seal {
  display: flex;
  align-items: center;
  gap: 16px;
  justify-content: flex-start;
}

.page-about .about-closing__ring {
  width: 132px;
  height: 132px;
  border-radius: 50%;
  border: 2px solid var(--gold);
  box-shadow: inset 0 0 0 8px rgba(201, 164, 92, 0.08), 0 0 32px rgba(201, 164, 92, 0.18);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  flex: none;
}

.page-about .about-closing__seal-num {
  font-size: var(--fs-28);
  color: var(--gold-bright);
  letter-spacing: 0.06em;
}

.page-about .about-closing__seal-txt {
  font-size: var(--fs-12);
  color: var(--paper-2);
  letter-spacing: 0.1em;
}

.page-about .about-closing__seal .annot--vertical {
  color: var(--paper-2);
}

/* ---------- 响应式 ---------- */
@media (min-width: 768px) {
  .page-about .about-hero__title {
    font-size: var(--fs-48);
  }

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

  .page-about .about-timeline__head .sec-head__title,
  .page-about .about-cats__head .sec-head__title,
  .page-about .about-ops__head .sec-head__title,
  .page-about .about-archive__lead .sec-head__title,
  .page-about .about-metrics__head .sec-head__title {
    font-size: var(--fs-36);
  }

  .page-about .about-cats__layout {
    grid-template-columns: 260px 1fr;
    gap: 32px;
    align-items: start;
  }

  .page-about .about-cats__list {
    position: sticky;
    top: 96px;
  }

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

  .page-about .about-ops__team--wide {
    grid-column: 1 / -1;
  }

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

  .page-about .about-metrics__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-closing__inner {
    grid-template-columns: 1fr auto;
    padding: 40px 36px;
  }

  .page-about .about-closing__title {
    font-size: var(--fs-28);
  }

  .page-about .about-closing__seal {
    justify-content: center;
  }
}

@media (min-width: 1024px) {
  .page-about {
    --about-card-pad: 32px;
  }

  .page-about .about-hero {
    padding-top: 48px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 6.5fr) minmax(0, 5.5fr);
    gap: 48px;
    align-items: center;
  }

  .page-about .about-hero__title {
    font-size: var(--fs-64);
  }

  .page-about .about-tl__item {
    grid-template-columns: 120px 1fr;
    gap: 24px;
    padding-bottom: 56px;
  }

  .page-about .about-tl::before {
    left: 11px;
  }

  .page-about .about-tl__marker {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding-top: 6px;
  }

  .page-about .about-tl__body.card {
    padding: var(--about-card-pad);
    border-left-width: 1px;
    border-top: 1px solid var(--line);
    border-left: 1px solid var(--line);
  }

  .page-about .about-tl__figure {
    float: right;
    width: 46%;
    margin: 4px 0 12px 20px;
  }

  .page-about .about-archive__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 48px;
  }

  .page-about .about-cats__layout {
    grid-template-columns: 300px 1fr;
    gap: 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-cats__tab,
  .page-about .about-ops__node {
    transition: none;
  }
}
</｜｜DSML｜｜ parameter>
</｜｜DSML｜｜ invoke>
</｜｜DSML｜｜ calls>