.page-about {
  --about-line: rgba(16, 28, 23, 0.14);
  --about-line-dark: rgba(255, 255, 255, 0.18);
  --about-text-soft: rgba(251, 250, 245, 0.78);
  background: var(--sand);
  color: var(--ink);
  overflow-x: clip;
}

/* ---------- 起手区 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(44px, 7vw, 88px) 0 clamp(40px, 6vw, 72px);
  background:
    radial-gradient(circle at 84% 8%, rgba(200, 162, 74, 0.2), transparent 56%),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.05) 0 1px, transparent 1px 72px),
    linear-gradient(158deg, var(--green-deep) 0%, var(--green-abyss) 54%, var(--dusk) 100%);
  color: var(--cloud);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 5vw, 44px);
}

.page-about .about-hero h1 {
  margin: 10px 0 0;
  font-size: clamp(38px, 8vw, 82px);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.03em;
  color: var(--cloud);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 44ch;
  font-size: clamp(15px, 2.2vw, 18px);
  line-height: 1.78;
  color: var(--about-text-soft);
}

.page-about .about-hero__meta {
  margin: 18px 0 0;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--gold-soft);
}

.page-about .about-hero__stats {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 6px 0 6px 20px;
  border-left: 2px solid var(--gold);
}

.page-about .hero-stat {
  display: block;
}

.page-about .hero-stat__label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: rgba(251, 250, 245, 0.62);
}

.page-about .hero-stat__value {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(30px, 7vw, 52px);
  line-height: 1.05;
  letter-spacing: 0.01em;
  color: var(--gold);
}

.page-about .hero-stat__unit {
  margin-left: 6px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  color: rgba(251, 250, 245, 0.7);
}

.page-about .about-hero__figure {
  margin: clamp(30px, 5vw, 56px) auto 0;
  border: 1px solid var(--about-line-dark);
  border-radius: var(--radius-l);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.05);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1500 / 840;
  object-fit: cover;
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: clamp(52px, 8vw, 104px) 0;
}

.page-about .about-section--seg {
  background: linear-gradient(180deg, var(--cloud), var(--sand));
}

.page-about .about-section--dusk {
  background: linear-gradient(170deg, var(--dusk) 0%, #16324e 60%, var(--green-abyss) 100%);
  color: var(--cloud);
}

.page-about .about-section--close {
  padding-bottom: clamp(72px, 10vw, 132px);
}

.page-about .about-head {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(30px, 5vw, 52px);
  padding-bottom: 18px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-head--sub {
  margin-top: clamp(8px, 2vw, 20px);
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-subtitle {
  margin: 0;
  font-size: clamp(22px, 3.4vw, 32px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--green-deep);
}

.page-about .about-body {
  row-gap: clamp(18px, 3vw, 30px);
}

.page-about .about-figure {
  margin: clamp(34px, 5vw, 56px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1100 / 560;
  object-fit: cover;
  border-radius: var(--radius-m);
  background: linear-gradient(140deg, var(--green-deep), var(--dusk));
}

.page-about .about-figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 编号拆解 ---------- */
.page-about .anatomy {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 8px;
  margin-bottom: clamp(28px, 4vw, 44px);
  padding: clamp(22px, 4vw, 34px);
  border-radius: var(--radius-m);
  background: linear-gradient(135deg, rgba(20, 80, 58, 0.08), rgba(27, 59, 95, 0.1));
}

.page-about .anatomy__part {
  display: grid;
  gap: 6px;
  padding: 12px 16px;
  border-radius: var(--radius-s);
  background: var(--cloud);
  border-bottom: 2px solid rgba(16, 28, 23, 0.12);
  transition: border-color 0.25s ease, background 0.25s ease;
}

.page-about .anatomy__part b {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(26px, 6vw, 44px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--green-deep);
}

.page-about .anatomy__part em {
  font-size: 11px;
  font-style: normal;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .anatomy__dash {
  font-family: var(--font-mono);
  font-size: clamp(22px, 5vw, 34px);
  color: var(--muted);
  padding-bottom: 20px;
}

.page-about .anatomy__part:hover,
.page-about .anatomy__part:focus-within {
  border-color: var(--gold);
  background: #fff;
}

.page-about .anatomy__part--year b {
  color: var(--dusk);
}

.page-about .anatomy__part--serial b {
  color: var(--copper);
}

/* ---------- 分架格阵 ---------- */
.page-about .rack-block {
  margin-top: clamp(32px, 5vw, 52px);
}

.page-about .rack-block__label {
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

.page-about .rack-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.page-about .rack {
  display: grid;
  gap: 2px;
  padding: 12px 10px;
  border-radius: var(--radius-s);
  background: var(--cloud);
  box-shadow: inset 3px 0 0 rgba(20, 80, 58, 0.35);
  transition: background 0.2s ease, box-shadow 0.2s ease;
}

.page-about .rack b {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 15px;
  color: var(--green-deep);
}

.page-about .rack em {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.02em;
  color: var(--muted);
  opacity: 0.65;
  transition: opacity 0.2s ease;
}

.page-about .rack:hover {
  background: #fff;
  box-shadow: inset 3px 0 0 var(--gold);
}

.page-about .rack:hover em {
  opacity: 1;
}

.page-about .rack--tail {
  background: linear-gradient(135deg, rgba(200, 162, 74, 0.18), rgba(176, 113, 60, 0.14));
  box-shadow: inset 3px 0 0 var(--copper);
}

/* ---------- 用户分段 ---------- */
.page-about .seg-switch {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .seg-switch .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .seg-switch .filter-count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .seg-cards {
  display: grid;
  gap: 18px;
}

.page-about .seg-card {
  padding: clamp(22px, 3.5vw, 30px);
}

.page-about .seg-card__title {
  margin: 10px 0 6px;
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .field-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .field-list li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .field-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 7px;
  height: 7px;
  background: var(--copper);
}

.page-about .field-list li span {
  display: block;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 2px;
}

/* ---------- 岗位分工 ---------- */
.page-about .about-section--dusk .about-head {
  border-bottom-color: var(--about-line-dark);
}

.page-about .about-section--dusk .section-title {
  color: var(--cloud);
}

.page-about .about-section--dusk .section-note {
  color: var(--about-text-soft);
}

.page-about .role-bar {
  display: flex;
  height: 16px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.12);
  margin-bottom: clamp(26px, 4vw, 40px);
}

.page-about .role-bar__seg {
  display: block;
}

.page-about .role-bar__seg--a {
  flex: 46;
  background: var(--green-meadow);
}

.page-about .role-bar__seg--b {
  flex: 132;
  background: var(--dusk-light);
}

.page-about .role-bar__seg--c {
  flex: 200;
  background: var(--gold);
}

.page-about .role-cards {
  display: grid;
  gap: 16px;
}

.page-about .role-card {
  padding: clamp(20px, 3.2vw, 28px);
  border-radius: var(--radius-m);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--about-line-dark);
}

.page-about .role-card__num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(30px, 5vw, 42px);
  line-height: 1;
  color: var(--gold-soft);
}

.page-about .role-card__num span {
  margin-left: 5px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  color: var(--about-text-soft);
}

.page-about .role-card h3 {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--cloud);
}

.page-about .role-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-text-soft);
}

.page-about .prose--on-dark {
  color: var(--about-text-soft);
}

.page-about .rail--on-dark {
  color: rgba(251, 250, 245, 0.7);
}

/* ---------- 年表 ---------- */
.page-about .history-grid {
  display: grid;
  gap: clamp(26px, 4vw, 40px);
}

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

.page-about .history-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1200 / 680;
  object-fit: cover;
  border-radius: var(--radius-m);
  background: linear-gradient(150deg, var(--dusk), var(--green-deep));
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 4px 0 0 28px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--copper) 0%, rgba(176, 113, 60, 0.18) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(26px, 4vw, 40px);
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--copper);
  box-shadow: 0 0 0 4px var(--sand);
}

.page-about .timeline__item--current::before {
  background: var(--gold);
}

.page-about .timeline__year {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(18px, 2.6vw, 22px);
  letter-spacing: 0.04em;
  color: var(--green-deep);
}

.page-about .timeline__item--current .timeline__year {
  color: var(--copper);
}

.page-about .timeline__body h3 {
  margin: 6px 0 4px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .timeline__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .timeline__item:nth-child(n + 5) .timeline__body h3 {
  font-size: 16px;
}

.page-about .timeline__item:nth-child(n + 5) .timeline__body p {
  font-size: 14px;
  line-height: 1.72;
}

/* ---------- 检索边界表格 ---------- */
.page-about .ledger-wrap {
  margin-top: clamp(28px, 4vw, 44px);
  overflow-x: auto;
}

.page-about .ledger caption {
  text-align: left;
  padding-bottom: 12px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .ledger th,
.page-about .ledger td {
  text-align: left;
}

/* ---------- 收尾 ---------- */
.page-about .close-panel {
  padding: clamp(28px, 5vw, 52px);
  border-radius: var(--radius-l);
  background:
    repeating-linear-gradient(90deg, rgba(20, 80, 58, 0.05) 0 1px, transparent 1px 56px),
    linear-gradient(140deg, var(--cloud), var(--sand));
  border-top: 3px solid var(--gold);
}

.page-about .close-panel .section-title {
  margin: 0;
}

.page-about .close-panel p {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .close-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-head {
    grid-template-columns: minmax(0, 1fr) minmax(200px, 260px);
    align-items: end;
    gap: 32px;
  }

  .page-about .rack-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

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

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(300px, 380px);
    align-items: end;
    gap: clamp(40px, 6vw, 80px);
  }

  .page-about .history-grid {
    grid-template-columns: minmax(0, 400px) minmax(0, 1fr);
    align-items: start;
    gap: clamp(36px, 5vw, 72px);
  }

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

  .page-about .about-figure--wide {
    max-width: 900px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .anatomy__part,
  .page-about .rack,
  .page-about .rack em {
    transition: none;
  }
}