.page-about {
  --about-band: clamp(2.6rem, 7vw, 5.4rem);
  --about-soft: rgba(12, 18, 32, 0.62);
  padding-bottom: clamp(2.4rem, 6vw, 5rem);
}

.page-about .about-head {
  max-width: 46rem;
}

.page-about .section__title {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 4.4vw, 2.35rem);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--fg);
  margin: 0.45rem 0 0.85rem;
}

.page-about .section__lede {
  font-size: clamp(0.94rem, 2.2vw, 1.03rem);
  line-height: 1.85;
  color: var(--fg-dim);
  margin: 0;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(1.6rem, 5vw, 3.6rem) 0 clamp(2.4rem, 7vw, 5rem);
  position: relative;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  top: 8%;
  width: min(46vw, 520px);
  height: min(46vw, 520px);
  background: radial-gradient(circle at 62% 38%, rgba(110, 74, 158, 0.28), rgba(27, 59, 111, 0.12) 46%, rgba(7, 10, 18, 0) 72%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(2rem, 5vw, 3.4rem);
  align-items: start;
}

.page-about .about-hero h1 {
  font-family: var(--font-title);
  font-size: clamp(1.9rem, 6.6vw, 3.7rem);
  line-height: 1.08;
  letter-spacing: -0.022em;
  color: var(--fg);
  max-width: 22ch;
  margin: 0.55rem 0 1rem;
}

.page-about .about-hero .lede {
  font-size: clamp(0.96rem, 2.3vw, 1.06rem);
  line-height: 1.9;
  color: var(--fg-dim);
  max-width: 40rem;
  margin: 0;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: clamp(1.4rem, 3.4vw, 2rem);
}

.page-about .about-rail {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-rail__item {
  background: var(--about-soft);
  padding: 1rem 1.1rem 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3.6vw, 1.75rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .about-rail__label {
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--fg-faint);
}

.page-about .about-rail__note {
  margin: 1rem 0 0;
  font-size: 0.82rem;
  line-height: 1.75;
  color: var(--fg-faint);
  border-left: 2px solid var(--stone);
  padding-left: 0.85rem;
}

/* ---------- 时间线章节 ---------- */

.page-about .about-era {
  padding: var(--about-band) 0;
  background: linear-gradient(180deg, rgba(91, 100, 112, 0.2) 0%, rgba(91, 100, 112, 0.03) 58%, rgba(7, 10, 18, 0) 100%);
}

.page-about .about-era__figure {
  margin: clamp(1.6rem, 4vw, 2.6rem) 0 0;
}

.page-about .about-timeline {
  list-style: none;
  margin: clamp(1.8rem, 4.6vw, 2.8rem) 0 0;
  padding: 0 0 0 1.5rem;
  position: relative;
  display: grid;
  gap: 0.75rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.9rem;
  bottom: 0.9rem;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--blue), var(--nebula) 42%, var(--cyan) 78%, var(--gold));
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: 1.15rem;
  width: 9px;
  height: 9px;
  margin-left: -4.5px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(57, 208, 216, 0.14);
  z-index: 1;
}

.page-about .about-node {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--about-soft);
  transition: border-color 0.28s var(--ease), background 0.28s var(--ease);
}

.page-about .about-node[open] {
  border-color: rgba(57, 208, 216, 0.36);
  background: rgba(27, 59, 111, 0.26);
}

.page-about .about-node__summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.55rem 0.9rem;
  padding: 0.95rem 1.1rem;
}

.page-about .about-node__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-node__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--fg-faint);
  transition: color 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .about-node[open] .about-node__summary::after {
  content: "−";
  color: var(--cyan);
}

.page-about .about-node__year {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-node__label {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--fg);
  line-height: 1.5;
}

.page-about .about-node__body {
  padding: 0 1.1rem 1.1rem;
}

.page-about .about-node__body p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--fg-dim);
}

/* ---------- 内容体系 ---------- */

.page-about .about-map {
  padding: var(--about-band) 0;
}

.page-about .about-archive {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  margin-top: clamp(1.6rem, 4vw, 2.4rem);
}

.page-about .about-archive__item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.3rem 1.25rem 1.5rem;
  background: var(--ink);
  text-decoration: none;
  position: relative;
  transition: background 0.26s var(--ease);
}

.page-about .about-archive__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--stone);
}

.page-about .about-archive__item--blue::before { background: var(--blue); }
.page-about .about-archive__item--nebula::before { background: var(--nebula); }
.page-about .about-archive__item--cyan::before { background: var(--cyan); }
.page-about .about-archive__item--clay::before { background: var(--clay); }
.page-about .about-archive__item--moss::before { background: var(--moss); }
.page-about .about-archive__item--gold::before { background: var(--gold); }

.page-about a.about-archive__item:hover,
.page-about a.about-archive__item:focus-visible {
  background: rgba(27, 59, 111, 0.24);
}

.page-about .about-archive__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--fg-faint);
}

.page-about .about-archive__name {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--fg);
  line-height: 1.45;
}

.page-about .about-archive__text {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--fg-dim);
}

/* ---------- 编号方法 ---------- */

.page-about .about-code-sec {
  padding: var(--about-band) 0;
  background: linear-gradient(180deg, rgba(111, 127, 90, 0.16) 0%, rgba(111, 127, 90, 0.02) 62%, rgba(7, 10, 18, 0) 100%);
}

.page-about .about-code-sec__grid {
  display: grid;
  gap: clamp(2rem, 5vw, 3rem);
  align-items: start;
}

.page-about .about-code-sec__head {
  max-width: 34rem;
}

.page-about .about-series {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 1.3rem;
}

.page-about .about-code-sec__note {
  margin: 1.1rem 0 0;
  font-size: 0.86rem;
  line-height: 1.8;
  color: var(--fg-faint);
}

.page-about .about-code-sec__figure {
  margin: 0 0 1.2rem;
}

.page-about .about-code {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-code__seg {
  display: grid;
  gap: 0.25rem;
  padding: 1rem 1.1rem 1.15rem;
  background: var(--about-soft);
}

.page-about .about-code__seg--nebula { box-shadow: inset 3px 0 0 var(--nebula); }
.page-about .about-code__seg--cyan { box-shadow: inset 3px 0 0 var(--cyan); }
.page-about .about-code__seg--gold { box-shadow: inset 3px 0 0 var(--gold); }

.page-about .about-code__digits {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--fg);
}

.page-about .about-code__role {
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-code__desc {
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--fg-faint);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  padding: var(--about-band) 0;
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(1.6rem, 4vw, 2.6rem);
  margin-top: clamp(1.6rem, 4vw, 2.4rem);
}

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

.page-about .about-team__list {
  display: grid;
  gap: 0.9rem;
}

.page-about .about-team__item {
  border: 1px solid var(--line);
  border-left-width: 3px;
  border-radius: var(--radius-sm);
  padding: 1rem 1.1rem 1.15rem;
  background: var(--about-soft);
}

.page-about .about-team__item--blue { border-left-color: var(--blue); }
.page-about .about-team__item--moss { border-left-color: var(--moss); }
.page-about .about-team__item--clay { border-left-color: var(--clay); }
.page-about .about-team__item--gold { border-left-color: var(--gold); }

.page-about .about-team__name {
  margin: 0 0 0.4rem;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--fg);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.82;
  color: var(--fg-dim);
}

/* ---------- 协作与荣誉 ---------- */

.page-about .about-partners {
  padding: var(--about-band) 0;
  background: linear-gradient(180deg, rgba(179, 106, 76, 0.16) 0%, rgba(179, 106, 76, 0.02) 60%, rgba(7, 10, 18, 0) 100%);
}

.page-about .about-partners__grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  margin-top: clamp(1.5rem, 4vw, 2.2rem);
}

.page-about .about-partners__cell {
  background: var(--ink);
  padding: 1.4rem 1.25rem 1.6rem;
}

.page-about .about-partners__name {
  margin: 0 0 1rem;
  font-family: var(--font-serif);
  font-size: 1.08rem;
  color: var(--fg);
}

.page-about .about-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-about .about-partners__row {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas: "num label" "num desc";
  column-gap: 0.9rem;
  row-gap: 0.15rem;
  align-items: baseline;
}

.page-about .about-partners__num {
  grid-area: num;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--gold);
  line-height: 1.1;
}

.page-about .about-partners__label {
  grid-area: label;
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--fg);
}

.page-about .about-partners__desc {
  grid-area: desc;
  font-size: 0.83rem;
  line-height: 1.7;
  color: var(--fg-faint);
}

.page-about .about-honors {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-about .about-honor {
  display: grid;
  gap: 0.2rem;
  padding: 0.85rem 0.95rem 0.95rem;
  border: 1px solid rgba(217, 164, 65, 0.28);
  border-radius: var(--radius-sm);
  background: radial-gradient(circle at 8% 12%, rgba(217, 164, 65, 0.14), rgba(7, 10, 18, 0) 62%);
  transition: border-color 0.26s var(--ease), background 0.26s var(--ease);
}

.page-about .about-honor:hover {
  border-color: rgba(217, 164, 65, 0.6);
  background: radial-gradient(circle at 8% 12%, rgba(217, 164, 65, 0.22), rgba(7, 10, 18, 0) 68%);
}

.page-about .about-honor__year {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-honor__title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--fg);
}

.page-about .about-honor__note {
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--fg-faint);
}

/* ---------- 年度报告 ---------- */

.page-about .about-report {
  padding: var(--about-band) 0 clamp(2.6rem, 6vw, 4.4rem);
}

.page-about .about-report__grid {
  display: grid;
  gap: 1rem;
  margin-top: clamp(1.5rem, 4vw, 2.2rem);
}

.page-about .about-report__card {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 1.3rem 1.25rem 1.5rem;
  background: var(--about-soft);
}

.page-about .about-report__card--paper {
  background: linear-gradient(160deg, rgba(242, 239, 231, 0.1), rgba(7, 10, 18, 0.4) 62%);
  border-color: var(--line-strong);
}

.page-about .about-report__card--clay {
  background: linear-gradient(160deg, rgba(179, 106, 76, 0.24), rgba(7, 10, 18, 0.4) 66%);
}

.page-about .about-report__name {
  margin: 0 0 0.55rem;
  font-family: var(--font-serif);
  font-size: 1.04rem;
  color: var(--fg);
}

.page-about .about-report__text {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.85;
  color: var(--fg-dim);
}

.page-about .about-report__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: clamp(1.5rem, 4vw, 2.2rem);
}

/* ---------- 响应式 ---------- */

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

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

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

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

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.85fr);
    gap: clamp(2.4rem, 5vw, 4.2rem);
  }

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

  .page-about .about-code-sec__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .about-archive {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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