.page-about {
  background:
    radial-gradient(115% 70% at 88% 0%, rgba(46, 90, 74, 0.55), transparent 62%),
    linear-gradient(180deg, var(--deep) 0%, var(--ink) 78%);
  color: var(--paper);
  font-family: var(--font-body);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about a:focus-visible,
.page-about summary:focus-visible,
.page-about .aside:focus-visible {
  outline: 2px solid var(--coral);
  outline-offset: 3px;
}

.page-about .breadcrumb {
  margin-top: clamp(16px, 3vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(20px, 4vw, 40px) 0 clamp(36px, 6vw, 76px);
}

.page-about .hero-grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .hero-kicker {
  margin-bottom: 14px;
  color: var(--clay);
}

.page-about h1 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 7.6vw, 84px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .hero-copy .lead {
  max-width: 46ch;
  margin: 0;
  color: var(--text-soft);
}

.page-about .hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 26px;
}

.page-about .hero-figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line-strong);
  background: linear-gradient(150deg, var(--moss), var(--ink));
}

.page-about .hero-figure::after {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(216, 177, 92, 0.2);
  pointer-events: none;
}

.page-about .hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .hero-figure .visual-frame__caption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-dim);
}

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  padding: clamp(40px, 6vw, 84px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-section .section-head {
  margin-bottom: clamp(24px, 4vw, 44px);
}

/* ---------- 起点与定位 ---------- */
.page-about .origin-grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .origin-text p {
  margin: 0 0 18px;
  max-width: 62ch;
  color: var(--text-soft);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .origin-text p:last-child {
  margin-bottom: 0;
}

.page-about .aside {
  position: relative;
  display: inline-block;
  color: var(--gold-light);
  border-bottom: 1px dashed var(--line-strong);
  cursor: help;
}

.page-about .aside-pop {
  position: absolute;
  left: 0;
  top: calc(100% + 8px);
  z-index: 6;
  width: min(300px, 76vw);
  padding: 12px 14px;
  background: var(--moss);
  border: 1px solid var(--line-strong);
  color: var(--text-soft);
  font-size: 13px;
  line-height: 1.65;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--ease), transform var(--ease), visibility var(--ease);
}

.page-about .aside:hover .aside-pop,
.page-about .aside:focus .aside-pop {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.page-about .origin-aside {
  align-self: start;
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--line);
  background: linear-gradient(165deg, rgba(28, 68, 56, 0.72), rgba(7, 17, 14, 0.5));
}

.page-about .fact-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .fact-list li {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 6px 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
}

.page-about .fact-list .k {
  color: var(--text-dim);
}

.page-about .fact-list .v {
  font-family: var(--font-mono);
  color: var(--gold);
}

.page-about .origin-aside .note {
  margin: 18px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
}

/* ---------- 发展历程 ---------- */
.page-about .chronicle {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

.page-about .year-index {
  align-self: start;
}

.page-about .year-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 12px 0 0;
  padding: 0;
}

.page-about .year-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 11px;
  border: 1px solid var(--line);
  color: var(--text-dim);
  font-size: 13px;
  text-decoration: none;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}

.page-about .year-link .y {
  color: var(--gold);
  font-size: 12px;
}

.page-about .year-link:hover,
.page-about .year-link:focus-visible {
  color: var(--paper);
  border-color: var(--line-strong);
  background: rgba(216, 177, 92, 0.1);
}

.page-about .chron-figure {
  margin: 0 0 clamp(24px, 4vw, 40px);
  border: 1px solid var(--line);
  background: var(--moss);
}

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

.page-about .chron-figure .visual-frame__caption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
}

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

.page-about .chronicle-track::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), rgba(216, 177, 92, 0.08));
}

.page-about .mile {
  position: relative;
  padding-bottom: clamp(26px, 4vw, 42px);
  scroll-margin-top: 96px;
}

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

.page-about .mile::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 0 4px rgba(255, 107, 74, 0.16);
  transition: box-shadow var(--ease);
}

.page-about .mile:hover::before {
  box-shadow: 0 0 0 7px rgba(255, 107, 74, 0.24);
}

.page-about .mile-year {
  display: inline-block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .mile-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.4vw, 23px);
  line-height: 1.35;
  color: var(--paper);
  transition: color var(--ease);
}

.page-about .mile:hover .mile-title {
  color: var(--gold-light);
}

.page-about .mile-text {
  margin: 0;
  max-width: 60ch;
  color: var(--text-soft);
  font-size: 15px;
  line-height: 1.78;
}

/* ---------- 服务团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .team-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--line-strong);
  background: var(--moss);
}

.page-about .team-visual .note {
  margin: 18px 0 0;
  font-size: 13.5px;
  line-height: 1.72;
}

.page-about .role {
  border-top: 1px solid var(--line);
}

.page-about .role:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .role summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 4px;
  list-style: none;
  cursor: pointer;
  transition: background var(--ease);
}

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

.page-about .role summary:hover {
  background: rgba(216, 177, 92, 0.07);
}

.page-about .role-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--clay);
}

.page-about .role-name {
  font-family: var(--font-display);
  font-size: 17px;
  color: var(--paper);
  transition: color var(--ease);
}

.page-about .role summary:hover .role-name,
.page-about .role[open] .role-name {
  color: var(--gold-light);
}

.page-about .role-plus {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--gold);
  transition: transform var(--ease);
}

.page-about .role[open] .role-plus {
  transform: rotate(45deg);
}

.page-about .role-body {
  padding: 0 4px 20px;
  color: var(--text-soft);
  font-size: 15px;
  line-height: 1.78;
}

.page-about .role-body p {
  margin: 0 0 12px;
  max-width: 58ch;
}

.page-about .role-body p:last-child {
  margin-bottom: 0;
}

/* ---------- 覆盖与响应 ---------- */
.page-about .coverage-lead {
  margin: 0 0 clamp(20px, 3vw, 32px);
  max-width: 62ch;
  color: var(--text-soft);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .coverage {
  display: grid;
  gap: 1px;
  border: 1px solid var(--line-strong);
  background: var(--line);
}

.page-about .coverage-cell {
  padding: clamp(20px, 3vw, 32px);
  background: linear-gradient(160deg, var(--moss), var(--deep));
}

.page-about .coverage-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1.2;
  color: var(--gold);
}

.page-about .coverage-label {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-soft);
}

.page-about .coverage-foot {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 66ch;
  color: var(--text-soft);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .inline-link {
  color: var(--gold-light);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  transition: color var(--ease), border-color var(--ease);
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  color: var(--coral);
  border-color: var(--coral);
}

/* ---------- 质量体系 ---------- */
.page-about .quality-grid {
  display: grid;
  gap: clamp(16px, 2vw, 24px);
}

.page-about .quality-card {
  padding: clamp(20px, 3vw, 28px);
  background: var(--paper);
  color: var(--deep);
  border: 1px solid rgba(7, 17, 14, 0.14);
  box-shadow: 0 10px 24px rgba(7, 17, 14, 0.35);
  transition: transform var(--ease), box-shadow var(--ease);
}

.page-about .quality-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 30px rgba(7, 17, 14, 0.48);
}

.page-about .q-num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--clay);
}

.page-about .quality-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  color: var(--deep);
}

.page-about .quality-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(14, 43, 36, 0.86);
}

.page-about .quality-note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--clay);
  max-width: 62ch;
  color: var(--text-soft);
  font-size: 15px;
  line-height: 1.78;
}

/* ---------- 持续更新 ---------- */
.page-about .update-grid {
  display: grid;
  gap: clamp(16px, 2vw, 22px);
}

.page-about .update-card {
  display: block;
  padding: clamp(22px, 3vw, 32px);
  border: 1px solid var(--line);
  background: rgba(28, 68, 56, 0.32);
  color: var(--paper);
  text-decoration: none;
  transition: border-color var(--ease), background var(--ease), transform var(--ease);
}

.page-about .update-card .label {
  color: var(--clay);
}

.page-about .update-card h3 {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.4;
  color: var(--paper);
}

.page-about .update-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-soft);
}

.page-about .update-card:hover,
.page-about .update-card:focus-visible {
  border-color: var(--line-strong);
  background: rgba(46, 90, 74, 0.45);
  transform: translateY(-2px);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .to-top {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.page-about .to-top:hover,
.page-about .to-top:focus-visible {
  color: var(--gold-light);
  border-bottom-color: var(--line-strong);
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .coverage {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .update-card--wide {
    grid-column: span 2;
  }
}

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: center;
  }

  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.34fr) minmax(0, 0.66fr);
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }

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

@media (min-width: 960px) {
  .page-about .chronicle {
    grid-template-columns: 176px minmax(0, 1fr);
  }

  .page-about .year-index {
    position: sticky;
    top: clamp(16px, 4vw, 32px);
  }

  .page-about .year-list {
    display: block;
    margin-top: 14px;
  }

  .page-about .year-link {
    border: 0;
    border-left: 2px solid transparent;
    padding: 9px 10px;
  }

  .page-about .year-link:hover,
  .page-about .year-link:focus-visible {
    border-left-color: var(--coral);
    background: rgba(216, 177, 92, 0.09);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .quality-card,
  .page-about .update-card,
  .page-about .aside-pop,
  .page-about .mile::before,
  .page-about .role-plus,
  .page-about .mile-title {
    transition: none;
  }

  .page-about .quality-card:hover,
  .page-about .update-card:hover,
  .page-about .update-card:focus-visible {
    transform: none;
  }
}