.page-about {
  padding-top: clamp(86px, 12vw, 118px);
  padding-bottom: clamp(56px, 9vw, 96px);
}

.page-about .about-top {
  margin-bottom: clamp(28px, 5vw, 52px);
}

.page-about .breadcrumb {
  margin-bottom: clamp(16px, 3vw, 26px);
}

/* 首屏框景 */
.page-about .about-hero {
  position: relative;
  border: 1px solid var(--line-gold);
  padding: clamp(28px, 5vw, 58px) clamp(20px, 4.5vw, 56px) clamp(28px, 5vw, 50px);
  background:
    linear-gradient(158deg, rgba(44, 108, 168, 0.22) 0%, rgba(20, 41, 60, 0.08) 45%, rgba(12, 26, 40, 0) 74%),
    var(--ink);
  box-shadow: var(--shadow-brut);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 9px;
  pointer-events: none;
  background:
    linear-gradient(var(--gold-soft), var(--gold-soft)) left top / 22px 1px no-repeat,
    linear-gradient(var(--gold-soft), var(--gold-soft)) left top / 1px 22px no-repeat,
    linear-gradient(var(--gold-soft), var(--gold-soft)) right top / 22px 1px no-repeat,
    linear-gradient(var(--gold-soft), var(--gold-soft)) right top / 1px 22px no-repeat,
    linear-gradient(var(--gold-soft), var(--gold-soft)) left bottom / 22px 1px no-repeat,
    linear-gradient(var(--gold-soft), var(--gold-soft)) left bottom / 1px 22px no-repeat,
    linear-gradient(var(--gold-soft), var(--gold-soft)) right bottom / 22px 1px no-repeat,
    linear-gradient(var(--gold-soft), var(--gold-soft)) right bottom / 1px 22px no-repeat;
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(1.95rem, 5.2vw, 3.35rem);
  line-height: 1.16;
  letter-spacing: -0.012em;
  color: var(--paper);
}

.page-about .about-lede {
  margin: 18px 0 0;
  max-width: 44ch;
  font-family: var(--serif);
  font-size: clamp(1rem, 1.9vw, 1.16rem);
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.86);
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
  margin-top: clamp(26px, 4vw, 40px);
  padding-top: clamp(20px, 3vw, 26px);
  border-top: 1px solid var(--line-gold);
}

.page-about .hero-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .hero-fact-num {
  font-family: var(--mono);
  font-size: clamp(1.35rem, 3.4vw, 1.85rem);
  letter-spacing: 0.01em;
  color: var(--gold-soft);
  border-bottom: 2px solid var(--gold);
  padding-bottom: 5px;
  align-self: flex-start;
}

.page-about .hero-fact-label {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--stone);
}

/* 双栏骨架 */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 48px);
}

.page-about .about-toc {
  display: none;
}

.page-about .about-body {
  min-width: 0;
}

/* 章节 */
.page-about .about-chapter {
  min-width: 0;
}

.page-about .about-chapter + .about-chapter {
  margin-top: clamp(48px, 8vw, 104px);
  padding-top: clamp(28px, 5vw, 46px);
  border-top: 1px solid var(--line-gold-soft);
}

.page-about .chapter-head {
  min-width: 0;
}

.page-about .chapter-num {
  display: inline-block;
  font-family: var(--mono);
  font-size: clamp(2.1rem, 6vw, 3.1rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--gold);
}

.page-about .chapter-num::after {
  content: "";
  display: block;
  width: 46px;
  height: 2px;
  margin-top: 12px;
  background: linear-gradient(90deg, var(--gold) 0%, rgba(201, 162, 75, 0) 100%);
}

.page-about .chapter-title {
  margin: 14px 0 0;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1.45rem, 3.6vw, 2.05rem);
  line-height: 1.32;
  color: var(--paper);
}

.page-about .chapter-lede {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: 0.98rem;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.78);
}

.page-about .about-para {
  margin: 22px 0 0;
  max-width: 38em;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.84);
}

.page-about .ch03 {
  margin: 22px 0 8px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.06rem;
  line-height: 1.5;
  color: var(--gold-soft);
}

.page-about .ch03:first-child {
  margin-top: 24px;
}

.page-about .about-chapter p {
  max-width: 38em;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.84);
}

.page-about .about-link {
  color: var(--enamel);
  text-decoration: none;
  border-bottom: 1px solid rgba(44, 108, 168, 0.6);
  padding-bottom: 1px;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--gold-soft);
  border-bottom-color: var(--gold);
}

/* 01 章节布局 */
.page-about .ch01-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 36px);
}

.page-about .ch01-text {
  min-width: 0;
}

.page-about .about-aside-fig,
.page-about .about-mid-fig,
.page-about .about-wide-fig {
  margin: 0;
  min-width: 0;
}

.page-about .about-aside-fig {
  margin-top: 8px;
}

.page-about .about-mid-fig {
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .about-wide-fig {
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .figure-frame img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.page-about .figure-caption {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  line-height: 1.7;
  color: var(--stone);
}

/* 02 版本对照 */
.page-about .version-pair {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: clamp(24px, 4vw, 34px);
}

.page-about .version-card {
  min-width: 0;
  padding: 22px 20px 24px;
  border: 1px solid var(--line-gold);
  background: var(--ink-2);
  box-shadow: var(--shadow-brut-sm);
}

.page-about .version-card--s8 {
  border-left: 3px solid var(--enamel);
}

.page-about .version-name {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.94rem;
  letter-spacing: 0.05em;
  color: var(--gold);
}

.page-about .version-tagline {
  margin: 10px 0 0;
  font-family: var(--serif);
  font-size: 1.04rem;
  line-height: 1.6;
  color: var(--paper);
}

.page-about .version-list {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .version-list li {
  position: relative;
  padding-left: 16px;
  margin-top: 9px;
  font-size: 0.93rem;
  line-height: 1.75;
  color: rgba(245, 241, 232, 0.8);
}

.page-about .version-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 1px;
  background: var(--gold-soft);
}

/* 03 数字档案条 */
.page-about .stat-rail {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(24px, 4vw, 36px);
  background: var(--line-gold-soft);
  border: 1px solid var(--line-gold-soft);
}

.page-about .stat-cell {
  min-width: 0;
  padding: 20px 16px 22px;
  background: var(--ink);
}

.page-about .stat-num {
  display: inline-block;
  font-family: var(--mono);
  font-size: clamp(1.5rem, 5vw, 2.1rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--paper);
  border-bottom: 2px solid var(--gold);
  padding-bottom: 6px;
}

.page-about .stat-label {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--stone);
}

.page-about .team-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 24px;
}

.page-about .team-item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  min-width: 0;
  padding: 12px 0 12px 16px;
  border-left: 3px solid var(--enamel);
  background: linear-gradient(90deg, rgba(20, 41, 60, 0.9) 0%, rgba(20, 41, 60, 0) 100%);
}

.page-about .team-count {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 1.32rem;
  color: var(--gold-soft);
}

.page-about .team-role {
  min-width: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(245, 241, 232, 0.8);
}

/* 04 历程档案抽屉 */
.page-about .archive-rail {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .archive-card {
  min-width: 0;
  border: 1px solid var(--line-gold-soft);
  background: var(--ink-2);
  box-shadow: var(--shadow-brut-sm);
}

.page-about .archive-card summary {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 44px 18px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .archive-card summary::after {
  content: "+";
  position: absolute;
  top: 16px;
  right: 16px;
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--gold);
}

.page-about .archive-card[open] summary::after {
  content: "−";
}

.page-about .archive-card[open] {
  border-color: var(--line-gold);
}

.page-about .archive-card summary:focus-visible {
  outline: 2px solid var(--enamel);
  outline-offset: -4px;
}

.page-about .archive-year {
  font-family: var(--mono);
  font-size: 1.3rem;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--gold);
}

.page-about .archive-name {
  font-family: var(--serif);
  font-size: 0.99rem;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .archive-body {
  padding: 0 18px 18px;
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(245, 241, 232, 0.76);
}

/* 05 维护节奏 */
.page-about .about-chapter--open .maintain-list {
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .maintain-item {
  padding: 20px 0;
  border-top: 1px solid var(--line-gold-soft);
}

.page-about .maintain-item:first-child {
  border-top-color: var(--line-gold);
}

.page-about .maintain-title {
  margin: 0;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.08rem;
  line-height: 1.55;
  color: var(--paper);
}

.page-about .maintain-text {
  margin: 8px 0 0;
  max-width: 38em;
  font-size: 0.95rem;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.78);
}

/* 06 备案与联系 */
.page-about .contact-block {
  margin-top: clamp(22px, 4vw, 32px);
  padding: 22px 20px;
  border: 1px solid var(--line-gold);
  background: var(--ink-2);
}

.page-about .contact-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 12px 0;
  border-top: 1px solid rgba(201, 162, 75, 0.14);
}

.page-about .contact-row:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .contact-key {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--stone);
}

.page-about .contact-val {
  min-width: 0;
  font-size: 0.96rem;
  line-height: 1.7;
  color: var(--paper);
  overflow-wrap: break-word;
  word-break: break-word;
}

/* 结尾入口 */
.page-about .about-cta {
  margin-top: clamp(48px, 8vw, 96px);
  padding-top: clamp(26px, 4vw, 40px);
  border-top: 1px solid var(--line-gold);
}

.page-about .cta-lede {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.05rem, 2.2vw, 1.28rem);
  line-height: 1.7;
  color: var(--paper);
}

.page-about .cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 700px) {
  .page-about .hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .team-split {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .team-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 14px 14px 16px 16px;
    background: rgba(20, 41, 60, 0.85);
  }

  .page-about .contact-row {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }
}

@media (min-width: 860px) {
  .page-about .ch01-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
    gap: 40px;
  }

  .page-about .about-aside-fig {
    margin-top: 24px;
  }

  .page-about .archive-rail {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: 176px minmax(0, 1fr);
    column-gap: 56px;
  }

  .page-about .about-toc {
    display: block;
    position: sticky;
    top: 104px;
    align-self: start;
    padding-left: 16px;
    border-left: 1px solid var(--line-gold);
  }

  .page-about .toc-title {
    margin: 0 0 12px;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.16em;
    color: var(--stone);
  }

  .page-about .toc-list {
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .page-about .toc-list li {
    margin: 0;
  }

  .page-about .toc-link {
    display: block;
    padding: 8px 0;
    font-size: 13px;
    line-height: 1.5;
    color: var(--stone);
    text-decoration: none;
    transition: color 0.18s ease;
  }

  .page-about .toc-num {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--gold);
    margin-right: 8px;
  }

  .page-about .toc-link:hover,
  .page-about .toc-link:focus-visible {
    color: var(--enamel);
    outline: none;
  }

  .page-about .toc-link:hover .toc-num,
  .page-about .toc-link:focus-visible .toc-num {
    color: var(--enamel);
  }

  .page-about .archive-rail {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .archive-card:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .archive-card:nth-child(3) {
    margin-top: 52px;
  }

  .page-about .archive-card:nth-child(4) {
    margin-top: 14px;
  }

  .page-about .about-chapter + .about-chapter {
    margin-top: clamp(80px, 9vw, 118px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .toc-link {
    transition: none;
  }
}
<<<END>>>