.page-about {
  --about-rail-w: 196px;
  --about-ink-on-paper: #22312b;
  --about-soft-on-paper: #4c5b54;
  background: var(--deep);
  color: var(--white);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 34px) 0 44px;
  background:
    radial-gradient(circle at 84% 4%, rgba(198, 255, 61, 0.16), transparent 46%),
    linear-gradient(158deg, var(--deep) 0%, var(--moss) 118%);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -46px;
  width: 58%;
  height: 96px;
  background: repeating-linear-gradient(115deg, rgba(198, 255, 61, 0.2) 0 2px, transparent 2px 13px);
  transform: skewY(-3deg);
  pointer-events: none;
}

.page-about .breadcrumb {
  position: relative;
  z-index: 1;
  font-size: 13px;
  color: var(--mist);
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .breadcrumb__link {
  color: var(--mist);
  text-decoration: none;
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--lime);
}

.page-about .breadcrumb__current {
  color: var(--white);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
  margin-top: 22px;
}

.page-about .about-hero .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--lime);
}

.page-about .about-hero__title {
  margin: 14px 0 18px;
  font-size: clamp(2rem, 6.6vw, 4.1rem);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-hero__lede {
  max-width: 60ch;
  margin: 0;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.9;
  color: rgba(244, 247, 242, 0.84);
}

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

.page-about .about-hero__actions .btn {
  font-size: 15px;
}

.page-about .about-hero__stamp {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero__stamp-cell {
  background: rgba(7, 17, 15, 0.62);
  padding: 12px 14px;
}

.page-about .about-hero__stamp dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-hero__stamp dd {
  margin: 5px 0 0;
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 600;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  display: grid;
  gap: 30px;
  padding-top: 38px;
  padding-bottom: 64px;
}

.page-about .about-rail {
  align-self: start;
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
}

.page-about .about-rail__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--mist);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 10px 0 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__link {
  display: inline-flex;
  gap: 7px;
  align-items: baseline;
  white-space: nowrap;
  padding: 7px 12px;
  border: 1px solid var(--line);
  color: var(--mist);
  text-decoration: none;
  font-size: 13px;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background-color 160ms var(--ease);
}

.page-about .about-rail__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--orange);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--deep);
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .about-rail__link:hover .about-rail__idx,
.page-about .about-rail__link:focus-visible .about-rail__idx {
  color: var(--deep);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  position: relative;
  padding-bottom: clamp(34px, 5vw, 58px);
  margin-bottom: clamp(30px, 4.6vw, 52px);
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .about-chapter__head {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 20px;
}

.page-about .about-chapter__num {
  flex: none;
  margin-top: 3px;
  padding: 2px 7px;
  border: 1px solid currentColor;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(1.35rem, 3.4vw, 2rem);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-note {
  display: none;
  flex: none;
  margin-left: auto;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.34em;
  color: var(--line);
}

.page-about .about-prose {
  max-width: 68ch;
}

.page-about .about-prose p {
  margin: 0 0 15px;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(244, 247, 242, 0.86);
}

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

.page-about .about-prose--tail {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px dashed var(--line);
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 24px;
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--moss);
  padding: 10px;
}

.page-about .about-figure .figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure .figure__caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-figure--sheet {
  margin-top: 24px;
  border-color: var(--paper-line);
  background: #f0ece0;
}

.page-about .about-figure--sheet .figure__caption {
  color: var(--about-soft-on-paper);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--lime) 0%, rgba(198, 255, 61, 0.25) 58%, rgba(255, 106, 42, 0.7) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 24px 28px;
}

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

.page-about .about-timeline__dot {
  position: absolute;
  left: 0;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--deep);
  border: 2px solid var(--lime);
  box-shadow: 0 0 0 3px rgba(198, 255, 61, 0.12);
}

.page-about .about-timeline__item:last-child .about-timeline__dot {
  border-color: var(--orange);
  box-shadow: 0 0 0 3px rgba(255, 106, 42, 0.18);
}

.page-about .about-timeline__stage {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-about .about-timeline__item:last-child .about-timeline__stage {
  color: var(--orange);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.88;
  color: rgba(244, 247, 242, 0.84);
}

/* ---------- 纸张叠层 ---------- */
.page-about .about-sheet {
  position: relative;
  z-index: 0;
  padding: clamp(20px, 3.6vw, 40px);
  background: var(--paper);
  border: 1px solid var(--paper-line);
  box-shadow: 10px 10px 0 rgba(198, 255, 61, 0.14);
}

.page-about .about-sheet::after {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 12px -9px -12px 12px;
  border: 1px solid var(--paper-line);
  background: rgba(255, 253, 246, 0.32);
}

.page-about .about-sheet .about-chapter__title {
  color: var(--about-ink-on-paper);
}

.page-about .about-sheet .about-chapter__num {
  color: #c2470f;
}

.page-about .about-sheet .about-note {
  color: #c3bda9;
}

.page-about .about-sheet .about-prose p {
  color: var(--about-ink-on-paper);
}

/* ---------- 团队网格 ---------- */
.page-about .about-team {
  display: grid;
  gap: 1px;
  margin-top: 24px;
  background: var(--paper-line);
  border: 1px solid var(--paper-line);
}

.page-about .about-team__cell {
  background: var(--paper);
  padding: 16px 18px;
}

.page-about .about-team__name {
  margin: 0 0 7px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: #c2470f;
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--about-ink-on-paper);
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 12px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__step {
  padding: 16px 18px;
  background: var(--moss);
  border: 1px solid var(--line);
  border-left: 3px solid var(--lime);
}

.page-about .about-flow__step:nth-child(3) {
  border-left-color: var(--lime-soft);
}

.page-about .about-flow__step:nth-child(4) {
  border-left-color: var(--orange);
}

.page-about .about-flow__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .about-flow__name {
  margin: 6px 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(244, 247, 242, 0.82);
}

/* ---------- 使用场景 ---------- */
.page-about .about-scenes {
  display: grid;
  gap: 18px;
  margin-top: 24px;
}

.page-about .about-scene {
  padding-top: 12px;
  border-top: 2px solid var(--about-ink-on-paper);
}

.page-about .about-scene__who {
  margin: 0 0 7px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--about-ink-on-paper);
}

.page-about .about-scene__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--about-soft-on-paper);
}

/* ---------- 主体信息 ---------- */
.page-about .about-meta {
  margin-top: 6px;
  padding: clamp(18px, 3vw, 30px);
  border: 1px solid var(--line);
  background: linear-gradient(148deg, var(--violet) 0%, var(--moss) 74%);
}

.page-about .about-meta__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px 24px;
  margin: 0;
}

.page-about .about-meta__item {
  border-left: 2px solid rgba(198, 255, 61, 0.55);
  padding-left: 12px;
}

.page-about .about-meta__item dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .about-meta__item dd {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--white);
  word-break: break-word;
}

.page-about .about-meta__item dd.num {
  font-family: var(--font-mono);
  color: var(--lime);
}

.page-about .about-meta__note {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid rgba(167, 184, 174, 0.28);
  font-size: 14px;
  line-height: 1.85;
  color: rgba(244, 247, 242, 0.78);
}

.page-about .about-meta__cta {
  margin-top: 18px;
  font-size: 15px;
}

/* ---------- 后续入口与顶部 ---------- */
.page-about .about-next {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin-top: 26px;
}

.page-about .about-next__link {
  position: relative;
  padding-right: 16px;
  font-size: 14.5px;
  color: var(--lime-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-next__link::after {
  content: "›";
  position: absolute;
  right: 0;
  color: var(--orange);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .about-top {
  display: inline-block;
  margin-top: 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist);
  text-decoration: none;
  border: 1px solid var(--line);
  padding: 8px 14px;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-top:hover,
.page-about .about-top:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 760px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
    gap: 34px;
    align-items: start;
  }

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

  .page-about .about-note {
    display: block;
  }
}

@media (min-width: 980px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 52px) 0 62px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 240px;
    align-items: end;
    gap: 52px;
    margin-top: 26px;
  }

  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 60px;
    padding-top: 58px;
    padding-bottom: 92px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 30px);
    border-bottom: 0;
    padding-bottom: 0;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    margin-top: 14px;
    overflow: visible;
    border-top: 1px solid var(--line);
  }

  .page-about .about-rail__link {
    display: flex;
    width: 100%;
    padding: 11px 8px 11px 0;
    border: 0;
    border-bottom: 1px solid var(--line);
    background: none;
    white-space: normal;
    align-items: baseline;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: none;
    color: var(--white);
    padding-left: 10px;
    border-left: 2px solid var(--lime);
    transition: padding-left 160ms var(--ease), border-color 160ms var(--ease), color 160ms var(--ease);
  }

  .page-about .about-rail__link:hover .about-rail__idx,
  .page-about .about-rail__link:focus-visible .about-rail__idx {
    color: var(--lime);
  }

  .page-about .about-chapter__title {
    max-width: 26ch;
  }

  .page-about .about-meta__item--wide {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-next__link,
  .page-about .about-top {
    transition: none;
  }
}
<<<END>>>