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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(16px, 3vw, 30px) 0 clamp(34px, 6vw, 76px);
  background:
    radial-gradient(120% 95% at 88% -15%, rgba(215, 38, 61, .22), transparent 62%),
    radial-gradient(90% 70% at -10% 105%, rgba(59, 232, 176, .10), transparent 66%),
    var(--ink-900);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 42%;
  background: repeating-linear-gradient(90deg, rgba(168, 189, 180, .07) 0 2px, transparent 2px 16px);
  pointer-events: none;
}

.page-about .about-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--muted);
}

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

.page-about .crumbs a:hover {
  color: var(--mint);
}

.page-about .crumbs [aria-current="page"] {
  color: var(--paper);
}

.page-about .hero-grid {
  display: grid;
  gap: 26px;
  margin-top: 22px;
}

.page-about h1 {
  margin: 14px 0 0;
  max-width: 15ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 7.4vw, 4.4rem);
  line-height: 1.03;
  letter-spacing: -.02em;
}

.page-about .hero-lead {
  margin: 16px 0 0;
  max-width: 46ch;
  font-size: clamp(.95rem, 1.6vw, 1.04rem);
  line-height: 1.85;
  color: rgba(244, 241, 232, .86);
}

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

.page-about .hero-index {
  padding: 18px;
  border: 1px solid var(--line);
  background: var(--glass);
  backdrop-filter: blur(6px);
}

.page-about .hi-title {
  margin: 0 0 12px;
  font-family: var(--font-hand);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--yellow);
}

.page-about .hi-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .hi-item dt {
  font-size: 12px;
  color: var(--muted);
}

.page-about .hi-item dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .02em;
  color: var(--mint);
}

/* ---------- 章节目录 ---------- */
.page-about .about-toc {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
  scrollbar-width: thin;
}

.page-about .about-toc .toc-link {
  flex: 0 0 auto;
  padding: 7px 11px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .02em;
  white-space: nowrap;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--line);
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-toc .toc-link:hover,
.page-about .about-toc .toc-link[aria-current="true"] {
  color: var(--paper);
  border-color: var(--red);
  background: rgba(215, 38, 61, .16);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding: clamp(38px, 6vw, 84px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .sec-head {
  display: grid;
  gap: 10px;
  margin-bottom: 26px;
}

.page-about .sec-head h2 {
  margin: 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.45rem, 3.6vw, 2.4rem);
  line-height: 1.14;
  letter-spacing: -.015em;
}

.page-about .prose {
  max-width: 62ch;
  color: rgba(244, 241, 232, .84);
}

.page-about .prose p {
  margin: 0 0 1.05em;
  font-size: clamp(.94rem, 1.5vw, 1rem);
  line-height: 1.85;
}

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

.page-about .media {
  margin: 0;
}

.page-about .media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .media-caption {
  margin-top: 9px;
  font-family: var(--font-hand);
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 引文 ---------- */
.page-about .origin-quote {
  margin: 30px 0 0;
  padding: 6px 0 6px 18px;
  max-width: 52ch;
  border-left: 3px solid var(--red);
}

.page-about .origin-quote p {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(1.15rem, 3vw, 1.55rem);
  line-height: 1.6;
  color: var(--paper);
}

.page-about .origin-quote cite {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 三条准则 ---------- */
.page-about .rules {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  max-width: 68ch;
}

.page-about .rule {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  column-gap: 14px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .rule:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 4px;
}

.page-about .rule-num {
  grid-row: 1 / span 3;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.85rem, 5vw, 2.7rem);
  line-height: .9;
  letter-spacing: -.04em;
  color: rgba(168, 189, 180, .3);
  transition: color .25s var(--ease);
}

.page-about .rule:hover .rule-num,
.page-about .rule:focus-within .rule-num {
  color: var(--red);
}

.page-about .rule-title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.05rem, 2.4vw, 1.32rem);
  letter-spacing: -.01em;
}

.page-about .rule-text {
  margin: 0;
  max-width: 58ch;
  font-size: .95rem;
  line-height: 1.8;
  color: rgba(244, 241, 232, .82);
}

.page-about .rule-more {
  grid-column: 2;
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: .88rem;
  line-height: 1.75;
  color: var(--mint);
  transition: max-height .3s var(--ease), opacity .3s var(--ease), margin-top .3s var(--ease);
}

.page-about .rule:hover .rule-more,
.page-about .rule:focus-within .rule-more {
  max-height: 7em;
  opacity: 1;
  margin-top: 8px;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 26px;
}

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

.page-about .team-figure img {
  aspect-ratio: 640 / 420;
}

.page-about .team-roles {
  margin: 22px 0 0;
  max-width: 62ch;
}

.page-about .role {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 14px;
  padding: 11px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .role dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--yellow);
}

.page-about .role dd {
  margin: 0;
  font-size: .9rem;
  line-height: 1.7;
  color: rgba(244, 241, 232, .8);
}

/* ---------- 版本演进 ---------- */
.page-about .versions-banner {
  margin: 0 0 28px;
}

.page-about .versions-banner img {
  aspect-ratio: 900 / 420;
}

.page-about .versions-grid {
  display: grid;
  gap: 22px;
}

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

.page-about .steps {
  display: grid;
  gap: 12px;
}

.page-about .step {
  padding: 12px 13px 14px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--line-strong);
  background: var(--ink-800);
}

.page-about .step summary {
  display: flex;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  list-style: none;
}

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

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

.page-about .step-year {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mint);
}

.page-about .step-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: .98rem;
  letter-spacing: -.01em;
}

.page-about .step p {
  margin: 10px 0 0;
  font-size: .84rem;
  line-height: 1.72;
  color: rgba(244, 241, 232, .78);
}

.page-about .step[open] {
  border-top-color: var(--yellow);
  background: #16332c;
}

.page-about .step.step-v4 {
  border-top-color: var(--mint);
  background: linear-gradient(180deg, rgba(59, 232, 176, .16), rgba(20, 48, 42, .92));
}

/* ---------- 影像 ---------- */
.page-about .photos-grid {
  display: grid;
  gap: 26px;
}

.page-about .photos-figure img {
  aspect-ratio: 600 / 400;
}

/* ---------- 合作 ---------- */
.page-about .partners-list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
  max-width: 68ch;
}

.page-about .partners-list li {
  padding: 14px 0 0;
  border-top: 2px solid var(--yellow);
}

.page-about .pt-name {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: -.01em;
}

.page-about .pt-desc {
  display: block;
  font-size: .88rem;
  line-height: 1.75;
  color: rgba(244, 241, 232, .78);
}

/* ---------- 荣誉（浅底） ---------- */
.page-about .honor {
  background: var(--paper);
  color: var(--on-paper);
  border-bottom: 0;
}

.page-about .honor .section-label {
  color: rgba(27, 43, 38, .62);
}

.page-about .honor .section-label b {
  color: var(--red);
}

.page-about .honor h2 {
  color: var(--on-paper);
}

.page-about .honor .prose {
  color: rgba(27, 43, 38, .84);
}

.page-about .honor-stamp {
  margin: 0 0 22px;
  padding-left: 16px;
  max-width: 20ch;
  border-left: 4px solid var(--red);
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.25rem, 3.6vw, 1.9rem);
  line-height: 1.45;
  color: var(--on-paper);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding: clamp(40px, 7vw, 84px) 0;
  background:
    radial-gradient(90% 130% at 18% 0%, rgba(215, 38, 61, .24), transparent 62%),
    var(--deep);
}

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 4.6vw, 2.6rem);
  line-height: 1.1;
  letter-spacing: -.02em;
}

.page-about .about-cta p {
  margin: 14px 0 0;
  max-width: 54ch;
  font-size: .95rem;
  line-height: 1.8;
  color: rgba(244, 241, 232, .8);
}

.page-about .cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

/* ---------- 断点 ---------- */
@media (min-width: 780px) {
  .page-about .sec-head {
    grid-template-columns: 152px minmax(0, 1fr);
    align-items: start;
    gap: 18px;
  }

  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1fr) 304px;
    align-items: start;
    gap: 40px;
    margin-top: 30px;
  }
}

@media (min-width: 720px) {
  .page-about .partners-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: end;
    gap: 10px;
  }

  .page-about .step {
    min-height: 150px;
  }

  .page-about .step:nth-child(1) {
    min-height: 110px;
  }

  .page-about .step:nth-child(2) {
    min-height: 145px;
  }

  .page-about .step:nth-child(3) {
    min-height: 180px;
  }

  .page-about .step:nth-child(4) {
    min-height: 215px;
  }
}

@media (min-width: 880px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) 320px;
    align-items: start;
    gap: 40px;
  }

  .page-about .photos-grid {
    grid-template-columns: 300px minmax(0, 1fr);
    align-items: start;
    gap: 40px;
  }
}

@media (min-width: 900px) {
  .page-about .versions-grid {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 30px);
    align-self: start;
    padding-left: 6px;
  }

  .page-about .rail {
    position: relative;
  }

  .page-about .rail::before {
    content: "";
    position: absolute;
    left: 13px;
    top: 14px;
    bottom: 14px;
    width: 1px;
    background: linear-gradient(180deg, var(--mint), rgba(59, 232, 176, .12));
  }

  .page-about .rail-item {
    position: relative;
    display: grid;
    grid-template-columns: 15px minmax(0, 1fr);
    align-items: center;
    column-gap: 8px;
    padding: 14px 0;
  }

  .page-about .rail-dot {
    width: 9px;
    height: 9px;
    margin-left: 2px;
    border-radius: 50%;
    border: 1px solid var(--mint);
    background: var(--ink-900);
    transition: background .2s var(--ease);
  }

  .page-about .rail-item:hover .rail-dot {
    background: var(--mint);
  }

  .page-about .rail-year {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: .02em;
    color: var(--paper);
  }

  .page-about .rail-part {
    grid-column: 2;
    font-family: var(--font-hand);
    font-size: 12px;
    color: var(--muted);
  }
}

@media (hover: none) {
  .page-about .rule-more {
    max-height: none;
    opacity: 1;
    margin-top: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rule-more,
  .page-about .rule-num,
  .page-about .about-toc .toc-link,
  .page-about .rail-dot {
    transition: none;
  }
}
<<<END>>>