.page-about {
  background: var(--ink-900);
  color: var(--paper);
  padding-bottom: 96px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
}
.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: rgba(245, 241, 230, .55);
}
.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(201, 162, 39, .6);
}
.page-about .breadcrumb a {
  color: rgba(245, 241, 230, .72);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease-out, border-color .2s ease-out;
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--gold-soft);
  border-bottom-color: var(--gold);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 40px 0 56px;
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -40% -10% auto auto;
  width: min(560px, 70vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, rgba(201, 162, 39, .18), rgba(201, 162, 39, 0) 68%);
  pointer-events: none;
}
.page-about .about-hero .eyebrow {
  position: relative;
  color: var(--gold-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  margin: 0 0 18px;
}
.page-about .about-hero h1 {
  position: relative;
  margin: 0 0 22px;
  max-width: 15em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 7.2vw, 62px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-about .about-hero .lead {
  position: relative;
  margin: 0 0 34px;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.85;
  color: rgba(245, 241, 230, .82);
}

.page-about .hero-facts {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--edge-soft);
  border: 1px solid var(--edge);
  border-radius: var(--radius-card);
  overflow: hidden;
}
.page-about .hero-facts li {
  background: var(--ink-700);
  padding: 18px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-about .hero-facts .num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 6vw, 36px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
}
.page-about .hero-facts .num--gold {
  color: var(--gold);
}
.page-about .fact-label {
  font-size: 13px;
  line-height: 1.5;
  color: rgba(245, 241, 230, .62);
}

/* ---------- 主栅格 ---------- */
.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin-top: 8px;
}

/* ---------- 左侧章节导航 ---------- */
.page-about .about-rail {
  position: sticky;
  top: var(--header-offset);
  z-index: 5;
  margin: 0 -20px 24px;
  padding: 10px 20px;
  background: linear-gradient(180deg, rgba(8, 37, 31, .97), rgba(8, 37, 31, .88));
  border-bottom: 1px solid var(--edge-soft);
  backdrop-filter: blur(6px);
}
.page-about .rail-title {
  display: none;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--mist);
}
.page-about .rail-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .rail-list::-webkit-scrollbar {
  display: none;
}
.page-about .rail-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 7px 13px;
  border: 1px solid var(--edge-soft);
  border-radius: var(--radius-pill);
  font-size: 13px;
  color: rgba(245, 241, 230, .78);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .2s ease-out, color .2s ease-out, background-color .2s ease-out;
}
.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  border-color: var(--gold);
  color: var(--gold-soft);
  background: rgba(201, 162, 39, .1);
}
.page-about .rail-num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--gold);
}

/* ---------- 章节 ---------- */
.page-about .about-body {
  min-width: 0;
}
.page-about .chapter {
  padding: 44px 0 12px;
}
.page-about .chapter + .chapter {
  border-top: 1px solid rgba(232, 207, 122, .12);
}
.page-about .chapter-head {
  position: relative;
  margin-bottom: 22px;
}
.page-about .chapter-num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: clamp(52px, 15vw, 96px);
  font-weight: 700;
  line-height: .86;
  letter-spacing: -.05em;
  color: transparent;
  -webkit-text-stroke: 2px var(--gold);
}
@supports not ((-webkit-text-stroke: 1px #000)) {
  .page-about .chapter-num {
    color: var(--gold);
  }
}
.page-about .chapter-title {
  margin: 0;
  max-width: 22em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 5.4vw, 36px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .prose {
  max-width: 40em;
}
.page-about .prose p {
  margin: 0 0 1.2em;
  font-size: 17px;
  line-height: 1.85;
  color: rgba(245, 241, 230, .82);
}
.page-about .prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 分隔带 ---------- */
.page-about .divider-band {
  margin: 28px 0 8px;
  padding: 20px 22px;
  border-left: 3px solid var(--gold);
  background: linear-gradient(90deg, rgba(23, 89, 74, .55), rgba(14, 58, 49, .12));
}
.page-about .divider-band p {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(17px, 4.2vw, 22px);
  line-height: 1.6;
  color: var(--gold-soft);
}

/* ---------- 图文分栏 ---------- */
.page-about .chapter-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-about .media {
  margin: 0;
  background: repeating-conic-gradient(from 0deg, rgba(201, 162, 39, .07) 0deg 90deg, rgba(8, 37, 31, .5) 90deg 180deg) 0 0 / 22px 22px;
  border: 1px solid var(--edge);
  border-radius: var(--radius-card);
  padding: 8px;
  box-shadow: var(--shadow-card);
}
.page-about .media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: calc(var(--radius-card) - 6px);
}
.page-about .media-caption {
  margin: 10px 2px 2px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}
.page-about .media--archive {
  margin-top: 34px;
  max-width: 620px;
}
.page-about .media--timeline {
  margin: 0 0 30px;
}

/* ---------- 团队分工带 ---------- */
.page-about .team-band-section {
  padding-top: 52px;
}
.page-about .team-band {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 30px 0 0;
}
.page-about .team-seg {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 18px 18px 16px;
  border: 1px solid var(--edge-soft);
  border-radius: var(--radius-card);
  background: var(--ink-700);
  cursor: default;
  outline: none;
  transition: transform .22s ease-out, box-shadow .22s ease-out, border-color .22s ease-out;
}
.page-about .team-seg--a { background: linear-gradient(135deg, var(--ink-500), var(--ink-700)); }
.page-about .team-seg--b { background: linear-gradient(135deg, rgba(47, 75, 124, .55), var(--ink-700)); }
.page-about .team-seg--c { background: linear-gradient(135deg, rgba(192, 57, 43, .32), var(--ink-700)); }
.page-about .team-seg:hover,
.page-about .team-seg:focus-within,
.page-about .team-seg:focus-visible {
  transform: translateY(-4px);
  border-color: var(--gold);
  box-shadow: var(--shadow-float);
}
.page-about .team-seg-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--paper);
}
.page-about .team-seg-count {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--gold-soft);
}
.page-about .team-seg-count .num {
  font-size: 20px;
  font-weight: 700;
  color: var(--gold);
}
.page-about .team-seg-bar {
  display: block;
  width: 100%;
  height: 3px;
  border-radius: 2px;
  background: rgba(245, 241, 230, .14);
  overflow: hidden;
  position: relative;
}
.page-about .team-seg-bar::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  border-radius: 2px;
  background: var(--gold);
}
.page-about .team-seg--a .team-seg-bar::after { width: 46%; }
.page-about .team-seg--b .team-seg-bar::after { width: 31%; background: var(--indigo-soft); }
.page-about .team-seg--c .team-seg-bar::after { width: 23%; background: var(--cinnabar); }

.page-about .team-seg-detail {
  flex: 1 1 100%;
  margin: 4px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(245, 241, 230, .78);
}

.page-about .band-note {
  margin: 22px 0 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 版本周期标签页 ---------- */
.page-about .tabs {
  margin-top: 30px;
  border: 1px solid var(--edge);
  border-radius: var(--radius-card);
  background: var(--ink-700);
  overflow: hidden;
}
.page-about .tabs-list {
  display: flex;
  gap: 4px;
  padding: 10px 10px 0;
  border-bottom: 1px solid var(--edge-soft);
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .tabs-list::-webkit-scrollbar { display: none; }
.page-about .tab {
  flex: 0 0 auto;
  padding: 12px 18px;
  border: 0;
  border-bottom: 3px solid transparent;
  background: transparent;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: rgba(245, 241, 230, .6);
  cursor: pointer;
  transition: color .2s ease-out, border-color .2s ease-out;
}
.page-about .tab:hover,
.page-about .tab:focus-visible {
  color: var(--gold-soft);
}
.page-about .tab[aria-selected="true"] {
  color: var(--gold);
  border-bottom-color: var(--gold);
}
.page-about .tab-panel {
  padding: 24px 20px 26px;
}
.page-about .panel-lead {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--paper);
}
.page-about .panel-list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .panel-list li {
  position: relative;
  padding: 10px 0 10px 22px;
  border-top: 1px solid rgba(232, 207, 122, .14);
  font-size: 15px;
  line-height: 1.75;
  color: rgba(245, 241, 230, .8);
}
.page-about .panel-list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 20px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold);
}

/* ---------- 折叠模板 ---------- */
.page-about .accordion {
  margin-top: 32px;
  border: 1px solid var(--edge);
  border-radius: var(--radius-card);
  background: var(--ink-700);
  overflow: hidden;
}
.page-about .accordion-item + .accordion-item {
  border-top: 1px solid var(--edge-soft);
}
.page-about .accordion-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 18px 20px;
  border: 0;
  background: transparent;
  text-align: left;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
  cursor: pointer;
}
.page-about .accordion-trigger:hover,
.page-about .accordion-trigger:focus-visible {
  color: var(--gold-soft);
}
.page-about .accordion-icon {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--gold);
}
.page-about .accordion-trigger[aria-expanded="true"] .accordion-icon {
  color: var(--gold-soft);
}
.page-about .accordion-panel {
  padding: 0 20px 22px;
}
.page-about .ask-template {
  margin: 0;
  padding: 16px 18px;
  border: 1px dashed var(--edge);
  border-radius: 12px;
  background: var(--ink-900);
  overflow-x: auto;
}
.page-about .ask-template code {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.9;
  color: var(--gold-soft);
  white-space: pre;
}
.page-about .template-hint {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}
.page-about .template-hint a {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid var(--edge);
}
.page-about .template-hint a:hover,
.page-about .template-hint a:focus-visible {
  color: var(--gold-soft);
}

/* ---------- 按钮组 ---------- */
.page-about .btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

/* ================= 平板 ================= */
@media (min-width: 700px) {
  .page-about .about-hero {
    padding: 56px 0 68px;
  }
  .page-about .hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-grid {
    margin-top: 16px;
  }
  .page-about .chapter-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }
  .page-about .chapter-split .media {
    margin-top: 4px;
  }
  .page-about .team-band {
    flex-direction: row;
    gap: 0;
    align-items: stretch;
  }
  .page-about .team-seg {
    flex-direction: column;
    align-items: flex-start;
    border-radius: 0;
    border-right-width: 0;
    padding: 22px 20px 20px;
  }
  .page-about .team-seg:first-child {
    border-top-left-radius: var(--radius-card);
    border-bottom-left-radius: var(--radius-card);
  }
  .page-about .team-seg:last-child {
    border-right-width: 1px;
    border-top-right-radius: var(--radius-card);
    border-bottom-right-radius: var(--radius-card);
  }
  .page-about .team-seg--a { flex: 0 0 46%; }
  .page-about .team-seg--b { flex: 0 0 31%; }
  .page-about .team-seg--c { flex: 0 0 23%; }
  .page-about .team-seg-name { font-size: 21px; }
  .page-about .team-seg-bar { margin-top: 14px; }
  .page-about .team-seg-detail {
    margin-top: 12px;
    font-size: 13.5px;
  }
  .page-about .media--archive {
    max-width: 640px;
  }
}

/* ================= 桌面 ================= */
@media (min-width: 980px) {
  .page-about {
    padding-bottom: 120px;
  }
  .page-about .about-grid {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 0 72px;
    margin-top: 24px;
  }
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-offset) + 28px);
    align-self: start;
    margin: 0;
    padding: 0 0 0 16px;
    background: transparent;
    border-bottom: 0;
    border-left: 1px solid var(--edge-soft);
    backdrop-filter: none;
  }
  .page-about .rail-title {
    display: block;
  }
  .page-about .rail-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }
  .page-about .rail-link {
    border: 0;
    border-radius: 0;
    padding: 9px 12px 9px 0;
    background: transparent;
    font-size: 14px;
    color: rgba(245, 241, 230, .55);
    position: relative;
  }
  .page-about .rail-link::before {
    content: "";
    position: absolute;
    left: -17px;
    top: 50%;
    transform: translateY(-50%) scaleY(.3);
    width: 2px;
    height: 22px;
    background: var(--gold);
    opacity: 0;
    transition: opacity .22s ease-out, transform .22s ease-out;
  }
  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    background: transparent;
    color: var(--gold-soft);
  }
  .page-about .rail-link:hover::before,
  .page-about .rail-link:focus-visible::before {
    opacity: 1;
    transform: translateY(-50%) scaleY(1);
  }
  .page-about .rail-label {
    display: inline;
  }
  .page-about .chapter {
    padding: 64px 0 20px;
  }
  .page-about .chapter:first-child {
    padding-top: 8px;
  }
  .page-about .chapter-head {
    display: grid;
    grid-template-columns: 150px minmax(0, 1fr);
    align-items: center;
    gap: 24px;
    margin-bottom: 30px;
  }
  .page-about .chapter-num {
    margin-bottom: 0;
    font-size: 92px;
  }
  .page-about .divider-band {
    margin: 36px 0 12px;
    padding: 26px 30px;
  }
  .page-about .team-seg {
    padding: 28px 24px 24px;
  }
  .page-about .team-seg-name { font-size: 23px; }
  .page-about .media--timeline {
    margin-bottom: 36px;
  }
  .page-about .tab-panel {
    padding: 30px 28px 32px;
  }
  .page-about .accordion-trigger {
    padding: 22px 26px;
  }
  .page-about .accordion-panel {
    padding: 0 26px 26px;
  }
}
<<<END>>>