.page-about {
  --rail-w: 236px;
  --about-gap: clamp(26px, 4vw, 56px);
  --card-pad: clamp(18px, 2.6vw, 30px);
  display: block;
  color: var(--mist);
  background:
    radial-gradient(1100px 520px at 82% -8%, var(--gold-08), transparent 68%),
    var(--ink);
  padding-bottom: clamp(56px, 9vw, 108px);
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-about .about-crumbs {
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(16px, 3vw, 26px) var(--gutter) 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cool);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.page-about .about-crumbs a {
  color: var(--gold);
  text-decoration: none;
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--amber);
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  display: grid;
  gap: clamp(30px, 4vw, 52px);
  padding-top: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(34px, 5vw, 62px);
  border-bottom: 1px solid var(--gold-16);
}

.page-about .hero-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
  margin: 0 0 16px;
  padding-left: 14px;
  border-left: 2px solid var(--amber);
}

.page-about .hero-title {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(27px, 5vw, 44px);
  line-height: 1.24;
  letter-spacing: 0.03em;
  color: var(--mist);
  margin: 0 0 18px;
}

.page-about .hero-lead {
  color: var(--silver);
  font-size: clamp(15px, 1.6vw, 16.5px);
  line-height: 1.95;
  margin: 0 0 14px;
  max-width: 58ch;
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1px;
  margin-top: clamp(24px, 3.4vw, 34px);
  background: var(--bronze);
  border: 1px solid var(--bronze);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-facts .data-cell {
  background: var(--ink-deep);
  padding: 16px 14px;
  display: block;
}

.page-about .about-facts .data-value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.4vw, 24px);
  color: var(--amber);
  letter-spacing: 0.03em;
  line-height: 1.2;
}

.page-about .about-facts .data-label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--cool);
  letter-spacing: 0.03em;
}

.page-about .about-hero-visual {
  position: relative;
  align-self: start;
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--bronze);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-deep);
}

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

.page-about .fig-cap {
  padding: 11px 14px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--cool);
  border-top: 1px solid var(--gold-16);
  background: var(--ink-deep);
}

.page-about .hero-seal {
  position: absolute;
  right: 6px;
  bottom: -18px;
  width: 92px;
  height: 92px;
  border-radius: 50%;
  border: 1px solid var(--gold);
  background: rgba(11, 12, 14, 0.92);
  display: grid;
  place-content: center;
  text-align: center;
  gap: 2px;
  box-shadow: 0 0 0 6px var(--gold-08);
}

.page-about .seal-code {
  font-family: var(--font-mono);
  font-size: 21px;
  letter-spacing: 0.06em;
  color: var(--amber);
  line-height: 1;
}

.page-about .seal-text {
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--silver);
}

/* ---------- 主体布局与索引栏 ---------- */

.page-about .about-layout {
  display: grid;
  gap: var(--about-gap);
  padding-top: clamp(30px, 4vw, 52px);
}

.page-about .rail-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--gold);
  margin: 0 0 12px;
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
}

.page-about .rail-list li {
  flex: 0 0 auto;
}

.page-about .rail-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid var(--bronze);
  border-radius: 999px;
  color: var(--silver);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about .rail-list a:hover,
.page-about .rail-list a:focus-visible {
  border-color: var(--gold);
  color: var(--mist);
  background: var(--gold-08);
}

.page-about .rail-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--gold);
  letter-spacing: 0.08em;
}

.page-about .rail-stamp {
  display: none;
}

/* ---------- 章节通用 ---------- */

.page-about .about-section {
  scroll-margin-top: 96px;
}

.page-about .about-section + .about-section {
  margin-top: clamp(46px, 6vw, 86px);
}

.page-about .sec-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  border-top: 1px solid var(--gold-16);
  padding-top: 15px;
  margin-bottom: clamp(18px, 2.4vw, 26px);
}

.page-about .sec-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
  flex: 0 0 auto;
}

.page-about .sec-title {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(20px, 2.6vw, 27px);
  letter-spacing: 0.03em;
  color: var(--mist);
  margin: 0;
  line-height: 1.35;
}

.page-about .about-p {
  color: var(--silver);
  font-size: clamp(15px, 1.5vw, 16px);
  line-height: 1.95;
  margin: 0 0 15px;
}

/* ---------- 认证 ---------- */

.page-about .identity-grid {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

.page-about .cert-panel {
  padding: var(--card-pad);
  border-radius: var(--radius);
  background: linear-gradient(165deg, var(--graphite), var(--ink-deep));
}

.page-about .cert-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--gold);
  margin: 0 0 16px;
}

.page-about .cert-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 13px;
}

.page-about .cert-list li {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  border-bottom: 1px dashed var(--gold-16);
  padding-bottom: 11px;
}

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

.page-about .cert-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .cert-val {
  color: var(--mist);
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 版本时间轴 ---------- */

.page-about .version-wrap {
  display: grid;
  gap: clamp(24px, 3vw, 38px);
  margin-top: 10px;
}

.page-about .version-tabs .tablist {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  border-bottom: 1px solid var(--gold-16);
  padding-bottom: 2px;
}

.page-about .version-tabs .tab {
  position: relative;
  flex: 0 0 auto;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  padding: 10px 15px 16px;
  text-align: start;
  cursor: pointer;
  display: grid;
  gap: 3px;
  color: var(--cool);
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .version-tabs .tab::before {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -5px;
  width: 8px;
  height: 8px;
  margin-left: -4px;
  border-radius: 50%;
  background: var(--graphite);
  border: 1px solid var(--bronze);
  transition: background-color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .version-tabs .tab[aria-selected="true"] {
  color: var(--mist);
  border-bottom-color: var(--gold);
}

.page-about .version-tabs .tab[aria-selected="true"]::before {
  background: var(--amber);
  border-color: var(--amber);
}

.page-about .version-tabs .tab:focus-visible {
  outline: 1px solid var(--amber);
  outline-offset: 2px;
}

.page-about .ver-num {
  font-family: var(--font-mono);
  font-size: 18px;
  letter-spacing: 0.08em;
  color: var(--gold);
  line-height: 1.2;
}

.page-about .version-tabs .tab[aria-selected="true"] .ver-num {
  color: var(--amber);
}

.page-about .ver-name {
  font-size: 12px;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.page-about .panel-lead {
  font-family: var(--font-serif);
  font-size: clamp(16px, 1.9vw, 18px);
  font-weight: 700;
  color: var(--mist);
  letter-spacing: 0.03em;
  margin: 20px 0 14px;
}

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

.page-about .ver-points li {
  position: relative;
  padding-left: 20px;
  color: var(--silver);
  font-size: 14.5px;
  line-height: 1.85;
}

.page-about .ver-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 7px;
  height: 7px;
  background: var(--gold-40);
  transform: rotate(45deg);
}

.page-about .version-figure {
  align-self: start;
}

.page-about .about-fold {
  margin-top: clamp(24px, 3vw, 32px);
  border: 1px solid var(--bronze);
  border-radius: var(--radius);
  background: var(--ink-deep);
  padding: 0 var(--card-pad);
}

.page-about .about-fold summary {
  cursor: pointer;
  padding: 16px 0;
  font-size: 14.5px;
  color: var(--mist);
  letter-spacing: 0.03em;
}

.page-about .about-fold[open] summary {
  color: var(--amber);
  border-bottom: 1px solid var(--gold-16);
}

.page-about .about-fold .fold-body {
  padding: 16px 0 6px;
}

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

/* ---------- 团队 ---------- */

.page-about .team-grid {
  display: grid;
  gap: clamp(24px, 3vw, 38px);
}

.page-about .team-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--bronze);
  border: 1px solid var(--bronze);
  border-radius: var(--radius);
  overflow: hidden;
  margin: clamp(20px, 3vw, 28px) 0;
}

.page-about .team-stat {
  background: var(--ink-deep);
  padding: 18px 16px;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(23px, 3vw, 30px);
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-about .stat-label {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--cool);
  letter-spacing: 0.04em;
}

.page-about .team-figure {
  align-self: start;
}

/* ---------- 质量与荣誉 ---------- */

.page-about .quality-list {
  list-style: none;
  margin: 0 0 clamp(18px, 2.4vw, 24px);
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .quality-list li {
  border-left: 2px solid var(--gold-24);
  padding-left: 16px;
  transition: border-color 0.25s var(--ease);
}

.page-about .quality-list li:hover {
  border-left-color: var(--gold);
}

.page-about .q-name {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--mist);
  letter-spacing: 0.03em;
  margin-bottom: 5px;
}

.page-about .q-desc {
  display: block;
  color: var(--silver);
  font-size: 14px;
  line-height: 1.85;
}

.page-about .honor-row {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .honor {
  display: grid;
  gap: 7px;
  padding: 20px 18px;
  border: 1px solid var(--bronze);
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--graphite), var(--ink-deep));
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .honor:hover,
.page-about .honor:focus-within {
  border-color: var(--gold);
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.45);
}

.page-about .honor-code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-about .honor-name {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--mist);
  line-height: 1.5;
}

.page-about .honor-note {
  font-size: 13px;
  line-height: 1.8;
  color: var(--cool);
  transition: color 0.3s var(--ease);
}

.page-about .honor:hover .honor-note,
.page-about .honor:focus-within .honor-note {
  color: var(--silver);
}

/* ---------- 合作生态 ---------- */

.page-about .partner-tabs .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.page-about .partner-tabs .tab {
  background: transparent;
  border: 1px solid var(--bronze);
  border-radius: 999px;
  padding: 9px 17px;
  color: var(--silver);
  font-size: 13.5px;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: background-color 0.25s var(--ease), border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .partner-tabs .tab:hover,
.page-about .partner-tabs .tab:focus-visible {
  border-color: var(--gold);
  color: var(--mist);
}

.page-about .partner-tabs .tab[aria-selected="true"] {
  background: var(--gold-16);
  border-color: var(--gold);
  color: var(--mist);
}

.page-about .partner-tabs .tabpanel {
  border-left: 1px solid var(--gold-24);
  margin-top: 20px;
  padding-left: clamp(14px, 2vw, 22px);
}

.page-about .partner-lead {
  margin-bottom: 0;
}

/* ---------- 起手入口 ---------- */

.page-about .start-grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-about .start-card {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 22px 20px;
  border: 1px solid var(--bronze);
  border-radius: var(--radius);
  background: var(--graphite);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.28s var(--ease), background-color 0.28s var(--ease), transform 0.28s var(--ease);
}

.page-about .start-card:hover,
.page-about .start-card:focus-visible {
  border-color: var(--amber);
  background: var(--ink-deep);
  transform: translateY(-2px);
}

.page-about .sc-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--gold);
}

.page-about .sc-title {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.03em;
  color: var(--mist);
}

.page-about .sc-desc {
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--silver);
  overflow-wrap: anywhere;
}

.page-about .sc-go {
  margin-top: 4px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--amber);
}

/* ---------- 响应式 ---------- */

@media (min-width: 760px) {
  .page-about .quality-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 26px;
  }

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

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

@media (min-width: 880px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .identity-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .cert-panel {
    margin-top: 14px;
  }
}

@media (min-width: 920px) {
  .page-about .version-wrap {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.22fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 62px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
    border-top: 1px solid var(--gold-16);
    padding-top: 18px;
  }

  .page-about .rail-list {
    display: grid;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .rail-list a {
    display: flex;
    border: 0;
    border-left: 1px solid var(--bronze);
    border-radius: 0;
    padding: 9px 0 9px 13px;
    white-space: normal;
    font-size: 13.5px;
    line-height: 1.6;
  }

  .page-about .rail-list a:hover,
  .page-about .rail-list a:focus-visible {
    border-left-color: var(--amber);
    background: transparent;
    color: var(--mist);
  }

  .page-about .rail-stamp {
    display: grid;
    gap: 6px;
    margin-top: 22px;
    padding: 14px 13px;
    border: 1px solid var(--bronze);
    border-radius: var(--radius);
    background: var(--ink-deep);
  }

  .page-about .stamp-code {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.16em;
    color: var(--amber);
  }

  .page-about .stamp-text {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.04em;
    color: var(--cool);
    overflow-wrap: anywhere;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .honor,
  .page-about .start-card,
  .page-about .rail-list a,
  .page-about .version-tabs .tab,
  .page-about .partner-tabs .tab {
    transition: none;
  }

  .page-about .honor:hover,
  .page-about .start-card:hover {
    transform: none;
  }
}
<<<END>>>