.page-about {
  --about-toc-w: 208px;
  --about-radius: 0;
}

/* 顶部面包屑条 */
.page-about .about-topbar {
  background: var(--paper);
  border-bottom: 1px solid var(--line-soft);
  padding: 14px 0;
}

/* 框景首屏 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(246, 240, 228, 0.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(246, 240, 228, 0.055) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--gold);
  opacity: 0.45;
}

.page-about .about-hero__frame {
  position: relative;
  z-index: 1;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(44px, 7vw, 88px) var(--pad) clamp(36px, 5vw, 64px);
  border-left: 1px solid var(--line-dark);
  border-right: 1px solid var(--line-dark);
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  top: 0;
  width: 72px;
  height: 2px;
  background: var(--gold);
}

.page-about .about-hero__frame::before { left: 0; }
.page-about .about-hero__frame::after { right: 0; }

.page-about .about-hero__title {
  margin: 18px 0 0;
  max-width: 16em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.85rem, 4.2vw, 3.3rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: clamp(0.98rem, 1.1vw, 1.08rem);
  line-height: 1.85;
  color: rgba(246, 240, 228, 0.8);
}

.page-about .about-hero__facts {
  margin-top: clamp(30px, 5vw, 54px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-dark);
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-fact {
  background: var(--ink);
  padding: 16px 14px 18px;
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(1.25rem, 2vw, 1.6rem);
  color: var(--gold-soft);
  letter-spacing: 0.01em;
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact__label {
  display: block;
  margin-top: 8px;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: rgba(246, 240, 228, 0.7);
}

/* 主体长卷 */
.page-about .about-shell {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(36px, 5vw, 64px) var(--pad) clamp(48px, 7vw, 88px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
}

/* 粘性目录 */
.page-about .about-toc { display: none; }

.page-about .about-toc__label {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold-deep);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-toc__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 4px;
  color: var(--slate);
  text-decoration: none;
  font-size: 0.85rem;
  line-height: 1.45;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-toc__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--gold-deep);
}

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

/* 章节 */
.page-about .about-chapter {
  scroll-margin-top: 100px;
  padding: clamp(28px, 4vw, 48px) 0 clamp(32px, 5vw, 56px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-flow > .about-chapter:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: clamp(12px, 2vw, 22px);
  margin-bottom: 20px;
}

.page-about .about-chapter__head .section-num {
  font-size: clamp(1.5rem, 3vw, 2.4rem);
  line-height: 1;
  color: var(--gold);
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.35rem, 2.6vw, 2rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-prose {
  max-width: 66ch;
  color: var(--ink-2);
}

.page-about .about-prose p {
  margin: 0 0 1.05em;
  font-size: 0.97rem;
  line-height: 1.85;
}

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

.page-about .about-prose a {
  color: var(--gold-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
}

.page-about .about-prose a:hover,
.page-about .about-prose a:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.page-about .about-prose--tight { margin-bottom: 22px; }

/* 深色章节 */
.page-about .about-chapter--dark {
  position: relative;
  overflow: hidden;
  margin: clamp(10px, 2vw, 20px) 0;
  padding-left: clamp(18px, 3vw, 36px);
  padding-right: clamp(18px, 3vw, 36px);
  background: var(--ink);
  color: var(--paper);
  border-bottom-color: transparent;
}

.page-about .about-chapter--dark .about-chapter__title { color: var(--white); }
.page-about .about-chapter--dark .about-chapter__head .section-num { color: var(--gold-soft); }
.page-about .about-chapter--dark .about-prose { color: rgba(246, 240, 228, 0.82); }

.page-about .about-chapter--dark .about-prose a {
  color: var(--gold-soft);
  border-bottom-color: var(--gold-soft);
}

.page-about .about-chapter--dark .about-prose a:hover,
.page-about .about-chapter--dark .about-prose a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--white);
}

/* 图版 */
.page-about .about-media {
  position: relative;
  margin: 4px 0 clamp(22px, 3vw, 32px);
  border: 1px solid var(--line-dark);
  background: var(--ink-2);
  overflow: hidden;
}

.page-about .about-media--timeline { aspect-ratio: 2 / 1; }

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

.page-about .about-media__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 8px 14px;
  background: rgba(11, 27, 43, 0.84);
  color: var(--gold-soft);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
}

/* 版本时间线 */
.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--line-dark-strong);
}

.page-about .about-tl__item {
  position: relative;
  padding-left: 34px;
  padding-bottom: clamp(20px, 3vw, 30px);
}

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

.page-about .about-tl__node {
  position: absolute;
  left: 0;
  top: 4px;
  display: block;
  width: 15px;
  height: 15px;
  color: var(--gold);
}

.page-about .about-tl__node svg { display: block; }

.page-about .about-tl__year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  color: var(--gold-soft);
  font-variant-numeric: tabular-nums;
}

.page-about .about-tl__title {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  transition: color 0.18s var(--ease);
}

.page-about .about-tl__desc {
  margin: 0;
  max-width: 58ch;
  font-size: 0.92rem;
  line-height: 1.75;
  color: rgba(246, 240, 228, 0.74);
}

.page-about .about-tl__item:hover .about-tl__title { color: var(--gold-soft); }

/* 团队 */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  align-items: start;
}

.page-about .about-team__visual {
  position: relative;
  aspect-ratio: 4 / 3;
  border: 1px solid var(--line);
  background: var(--ink-2);
  overflow: hidden;
}

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

.page-about .about-team__cards {
  display: grid;
  gap: 14px;
}

.page-about .about-team__card {
  border: 1px solid var(--line);
  background: var(--white);
  padding: 18px 20px 20px;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-team__card:hover,
.page-about .about-team__card:focus-within {
  border-color: var(--gold);
  transform: translateX(4px);
}

.page-about .about-team__role {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-team__role span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--gold-deep);
}

.page-about .about-team__card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--slate);
}

/* 协作网络 */
.page-about .about-network { isolation: isolate; }

.page-about .about-network__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.34;
}

.page-about .about-network::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background: linear-gradient(105deg, rgba(11, 27, 43, 0.94) 0%, rgba(11, 27, 43, 0.74) 54%, rgba(23, 50, 77, 0.5) 100%);
}

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

/* 记录展签 */
.page-about .about-records {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-record {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 10px 18px 0;
  border-bottom: 1px solid var(--line);
  transition: background-color 0.18s var(--ease);
}

.page-about .about-record:hover { background: rgba(201, 162, 39, 0.07); }

.page-about .about-record__tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold-deep);
}

.page-about .about-record__text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--ink-2);
}

.page-about .about-record__text strong {
  font-weight: 700;
  color: var(--ink);
}

/* 下一步 */
.page-about .about-next {
  background: var(--paper-2);
  border-top: 1px solid var(--line);
  padding: clamp(40px, 6vw, 72px) 0;
}

.page-about .about-next__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--pad);
}

.page-about .about-next__title {
  margin: 14px 0 0;
  max-width: 24em;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.6vw, 2rem);
  font-weight: 700;
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-next__desc {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* 响应式 */
@media (min-width: 760px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-record {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
    padding-right: 16px;
  }
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    column-gap: clamp(28px, 4vw, 52px);
  }

  .page-about .about-team__card:nth-child(2) { margin-left: 26px; }
  .page-about .about-team__card:nth-child(3) { margin-left: 52px; }
}

@media (min-width: 960px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-toc-w) minmax(0, 1fr);
    column-gap: clamp(32px, 4vw, 60px);
  }

  .page-about .about-toc {
    display: block;
    position: sticky;
    top: 96px;
    padding-left: 16px;
    border-left: 2px solid var(--line);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__link,
  .page-about .about-team__card,
  .page-about .about-tl__title,
  .page-about .about-record {
    transition: none;
  }

  .page-about .about-team__card:hover,
  .page-about .about-team__card:focus-within {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>