.page-about {
  --about-grid: rgba(11, 42, 59, 0.055);
  --about-line: rgba(11, 42, 59, 0.16);
  --about-cut: var(--ice);
  background-color: var(--ice);
  color: var(--ink);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 104px 0 56px;
  background-image:
    linear-gradient(to right, var(--about-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-grid) 1px, transparent 1px);
  background-size: 80px 80px;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 40px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--grey);
}

.page-about .about-hero .breadcrumb a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-hero .breadcrumb a:hover,
.page-about .about-hero .breadcrumb a:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 40px;
}

.page-about .about-hero__lead .coord {
  display: block;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--green);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0 0 26px;
  font-size: clamp(2.35rem, 9.2vw, 5.2rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--ink);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--orange);
  position: relative;
}

.page-about .about-hero__title em::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.06em;
  height: 4px;
  background: var(--yellow);
}

.page-about .about-hero__lede {
  max-width: 46ch;
  margin: 0 0 28px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
}

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

.page-about .about-hero__figure {
  margin: 0;
  border-left: 1px solid var(--about-line);
  padding-left: 0;
}

.page-about .about-hero__figure .figure__frame {
  border: 1px solid var(--line-strong);
  background: var(--mist);
}

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

.page-about .about-hero__figure .figure__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--grey);
}

/* ---------- 主体：索引栏 + 叙事流 ---------- */
.page-about .about-body {
  padding-top: 56px;
  padding-bottom: 72px;
  display: grid;
  gap: 40px;
}

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

.page-about .about-flow {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-block {
  padding-bottom: 56px;
  margin-bottom: 56px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-block:last-of-type {
  border-bottom: 0;
  margin-bottom: 32px;
  padding-bottom: 0;
}

.page-about .about-block__head {
  margin-bottom: 26px;
  padding-top: 14px;
  border-top: 2px solid var(--ink);
}

.page-about .about-block__idx {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-block__title {
  margin: 0;
  font-size: clamp(1.5rem, 5.4vw, 2.4rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
  font-weight: 900;
  color: var(--ink);
}

.page-about .about-block__note {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--grey);
  font-style: italic;
}

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

.page-about .about-block__body .prose p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-quote {
  margin: 30px 0 0;
  padding: 22px 22px 22px 26px;
  border-left: 4px solid var(--orange);
  background: var(--mist);
  font-family: var(--font-mono);
  font-size: clamp(1rem, 3.6vw, 1.35rem);
  line-height: 1.5;
  letter-spacing: 0.01em;
  color: var(--ink);
}

/* ---------- 原则卡片 ---------- */
.page-about .about-principles {
  display: grid;
  gap: 16px;
}

.page-about .about-principle {
  position: relative;
  padding: 26px 22px 22px;
  background: var(--mist);
  border: 1px solid var(--line-strong);
  outline: none;
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease), box-shadow 0.28s var(--ease);
}

.page-about .about-principle::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 22px 22px 0;
  border-color: transparent var(--about-cut) transparent transparent;
}

.page-about .about-principle:hover,
.page-about .about-principle:focus-within,
.page-about .about-principle:focus-visible {
  transform: translateY(-3px);
  border-color: var(--ink);
  box-shadow: 0 10px 0 -6px rgba(11, 42, 59, 0.18);
}

.page-about .about-principle__code {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--green);
}

.page-about .about-principle__title {
  margin: 0 0 10px;
  font-size: 20px;
  line-height: 1.3;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-principle__text {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .about-principle__note {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line-strong);
  font-size: 13px;
  line-height: 1.65;
  color: var(--green);
  transition: color 0.28s var(--ease), opacity 0.28s var(--ease), transform 0.28s var(--ease);
}

/* ---------- 团队 ---------- */
.page-about .about-team-figure {
  margin: 30px 0 28px;
}

.page-about .about-team-figure .figure__frame {
  border: 1px solid var(--line-strong);
  background: var(--ice-deep);
}

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

.page-about .about-team-figure .figure__caption,
.page-about .about-tl-figure .figure__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--grey);
}

.page-about .about-team {
  display: grid;
  gap: 0;
  margin: 0 0 32px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.page-about .about-team__item {
  padding: 18px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-team__name {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.page-about .about-team__name::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 2px;
  margin-right: 10px;
  vertical-align: 4px;
  background: var(--orange);
}

.page-about .about-team__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--grey);
}

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

.page-about .about-stats__cell {
  padding: 16px 14px;
  background: var(--mist);
}

.page-about .about-stats dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--grey);
  margin-bottom: 8px;
}

.page-about .about-stats dd {
  margin: 0;
  font-size: 14px;
  color: var(--ink);
}

.page-about .about-stats__num {
  font-size: 26px;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-right: 2px;
}

/* ---------- 版本时间线 ---------- */
.page-about .about-tl-figure {
  margin: 0 0 26px;
}

.page-about .about-tl-figure .figure__frame {
  border: 1px solid var(--line-strong);
  background: var(--ice-deep);
}

.page-about .about-tl {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 10px;
  width: 1px;
  background: var(--line-strong);
}

.page-about .about-tl__item {
  position: relative;
  margin-bottom: 10px;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 16px;
  width: 9px;
  height: 9px;
  background: var(--ice);
  border: 1.5px solid var(--ink);
}

.page-about .about-node {
  border: 1px solid var(--about-line);
  background: var(--mist);
  transition: border-color 0.28s var(--ease);
}

.page-about .about-node:hover,
.page-about .about-node[open] {
  border-color: var(--ink);
}

.page-about .about-node__btn {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
}

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

.page-about .about-node__btn:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-about .about-node__ver {
  flex: none;
  padding: 2px 8px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ice);
  background: var(--ink);
}

.page-about .about-node__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  font-family: var(--font-sans);
}

.page-about .about-node[open] .about-node__ver {
  background: var(--orange);
}

.page-about .about-node__panel {
  padding: 0 16px 16px 16px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-node__panel p {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 伙伴 ---------- */
.page-about .about-regions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 26px;
  padding: 0;
  list-style: none;
}

.page-about .about-callout {
  border-left: 4px solid var(--ink);
  padding: 20px 20px 20px 22px;
}

.page-about .about-callout__title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink);
  text-transform: uppercase;
}

.page-about .about-callout p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  background: var(--ink);
  color: var(--ice);
  padding: 34px 24px;
  position: relative;
  overflow: hidden;
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(232, 241, 248, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(232, 241, 248, 0.07) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

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

.page-about .about-cta__title {
  margin: 0 0 14px;
  font-size: clamp(1.4rem, 5vw, 2rem);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .about-cta__text {
  margin: 0 0 24px;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(232, 241, 248, 0.82);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta .btn--primary {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ice);
}

.page-about .about-cta .btn--primary:hover,
.page-about .about-cta .btn--primary:focus-visible {
  background: var(--yellow);
  border-color: var(--yellow);
  color: var(--black);
}

.page-about .about-cta .btn--ghost {
  background: transparent;
  border-color: rgba(232, 241, 248, 0.45);
  color: var(--ice);
}

.page-about .about-cta .btn--ghost:hover,
.page-about .about-cta .btn--ghost:focus-visible {
  border-color: var(--yellow);
  color: var(--yellow);
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 120px 0 72px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: end;
    gap: 32px;
  }

  .page-about .about-hero__figure {
    padding-left: 24px;
  }

  .page-about .about-principles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-cta {
    padding: 48px 40px;
  }
}

/* ---------- 桌面：固定索引栏 ---------- */
@media (min-width: 1000px) {
  .page-about .about-hero {
    padding-top: 148px;
  }

  .page-about .about-body {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: 64px;
    padding-top: 72px;
    padding-bottom: 96px;
  }

  .page-about .about-rail {
    display: block;
    align-self: start;
    position: sticky;
    top: calc(var(--header-h) + 40px);
    border-left: 1px solid var(--line-strong);
    padding-left: 16px;
  }

  .page-about .about-rail .coord {
    display: block;
    margin: 0 0 16px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.14em;
    color: var(--grey);
  }

  .page-about .about-rail__list {
    margin: 0 0 24px;
    padding: 0;
    list-style: none;
  }

  .page-about .about-rail__list li {
    margin-bottom: 2px;
  }

  .page-about .about-rail__list a {
    display: flex;
    gap: 10px;
    padding: 7px 4px;
    font-size: 14px;
    color: var(--ink);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
  }

  .page-about .about-rail__list a span {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--grey);
    letter-spacing: 0.08em;
    padding-top: 3px;
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    color: var(--orange);
    border-bottom-color: var(--orange);
    outline: none;
  }

  .page-about .about-rail__list a:hover span,
  .page-about .about-rail__list a:focus-visible span {
    color: var(--orange);
  }

  .page-about .about-rail .annotation {
    margin: 0;
    font-size: 12px;
    line-height: 1.7;
    color: var(--grey);
  }

  .page-about .about-rail .annotation a {
    color: var(--green);
    text-decoration: none;
    border-bottom: 1px solid var(--line-strong);
  }

  .page-about .about-rail .annotation a:hover,
  .page-about .about-rail .annotation a:focus-visible {
    color: var(--orange);
    border-bottom-color: var(--orange);
  }

  .page-about .about-block {
    padding-bottom: 72px;
    margin-bottom: 72px;
  }

  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .about-principle:nth-child(2) {
    transform: translateY(22px);
  }

  .page-about .about-principle:nth-child(2):hover,
  .page-about .about-principle:nth-child(2):focus-within {
    transform: translateY(18px);
  }

  .page-about .about-principle:nth-child(3) {
    transform: translateY(44px);
  }

  .page-about .about-principle:nth-child(3):hover,
  .page-about .about-principle:nth-child(3):focus-within {
    transform: translateY(40px);
  }

  .page-about .about-principles {
    padding-bottom: 48px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-tl {
    padding-left: 30px;
  }

  .page-about .about-cta {
    padding: 56px 48px;
  }

  .page-about .about-cta__text {
    font-size: 16px;
  }
}
<<<PAGE_CSS_END>>>