.page-about {
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 26px) 0 52px;
  background:
    radial-gradient(95% 80% at 108% -10%, rgba(198, 242, 74, 0.13), transparent 62%),
    linear-gradient(180deg, var(--ink-2) 0%, var(--ink) 82%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -58%;
  left: 34%;
  height: 300px;
  background: linear-gradient(90deg, transparent, rgba(255, 122, 47, 0.16));
  transform: skewY(-7deg);
  pointer-events: none;
}

.page-about .about-hero .breadcrumbs {
  position: relative;
  z-index: 1;
  margin-bottom: 26px;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(32px, 6.6vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 14px 0 20px;
  max-width: 13em;
}

.page-about .about-h1-mark {
  color: var(--lime);
  border-bottom: 3px solid rgba(198, 242, 74, 0.35);
}

.page-about .about-hero .lede {
  max-width: 36em;
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(245, 247, 244, 0.8);
}

.page-about .about-stamp {
  position: relative;
  padding: 20px 20px 14px;
  background: rgba(23, 57, 47, 0.7);
  border: 1px solid var(--line-lime);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.page-about .about-stamp__head {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mute);
}

.page-about .about-stamp__row {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 11px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-stamp__yr {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--lime);
  min-width: 4ch;
}

.page-about .about-stamp__txt {
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: rgba(245, 247, 244, 0.74);
}

/* ============ 主布局 ============ */
.page-about .about-layout {
  padding-top: 44px;
  padding-bottom: 64px;
}

/* ============ 左侧刻度轨道 ============ */
.page-about .about-rail__track {
  position: sticky;
  top: calc(var(--header-h) + 18px);
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: 16px;
  border-left: 1px solid var(--line-strong);
}

.page-about .rail-node {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 8px 10px 0;
  text-decoration: none;
  color: var(--mute);
  transition: color 0.25s var(--ease);
}

.page-about .rail-node:hover {
  color: var(--paper);
}

.page-about .rail-node.is-active {
  color: var(--lime);
}

.page-about .rail-date {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.page-about .rail-label {
  font-size: 15px;
  letter-spacing: 0.02em;
}

/* ============ 章节通用 ============ */
.page-about .about-section {
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-section:first-child {
  padding-top: 0;
}

.page-about .about-section h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  margin: 10px 0 16px;
}

.page-about .about-subhead {
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 26px 0 12px;
}

.page-about .prose {
  max-width: 36em;
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.74;
  color: rgba(245, 247, 244, 0.79);
}

/* ============ 三条原则 ============ */
.page-about .about-principles {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.page-about .about-principle {
  position: relative;
  padding: 20px 18px;
  background: var(--ink-2);
  border-left: 2px solid var(--lime);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .about-principle__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .about-principle h3 {
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 8px 0 10px;
}

.page-about .about-principle p {
  margin: 0;
  font-size: 14px;
  line-height: 1.68;
  color: rgba(245, 247, 244, 0.74);
}

/* ============ 版本档案区 ============ */
.page-about .about-archive {
  margin: 24px 0 18px;
  padding: 20px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px));
  transition: background 0.4s var(--ease), color 0.4s var(--ease), border-color 0.4s var(--ease);
}

.page-about .about-archive[data-view="archive"] {
  background: var(--archive);
  color: var(--archive-ink);
  border-color: var(--archive-2);
  box-shadow:
    0 16px 0 -12px var(--archive-2),
    0 30px 0 -24px rgba(217, 207, 184, 0.55);
}

.page-about .about-archive__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.page-about .about-archive__hint {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mute);
}

.page-about .about-archive[data-view="archive"] .about-archive__hint {
  color: #6A6558;
}

.page-about .about-archive .view-toggle {
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.12em;
  padding: 8px 15px;
  background: transparent;
  color: inherit;
  border: 1px solid currentColor;
  border-radius: var(--radius-pill);
  cursor: pointer;
  opacity: 0.72;
  transition: opacity 0.2s var(--ease);
}

.page-about .about-archive .view-toggle:hover,
.page-about .about-archive .view-toggle:focus-visible {
  opacity: 1;
}

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

.page-about .about-version-card {
  padding: 16px 16px 18px;
  background: var(--ink-3);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: background 0.4s var(--ease), border-color 0.4s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-version-card:hover {
  transform: translate(-2px, -2px);
  border-color: var(--line-lime);
}

.page-about .about-archive[data-view="archive"] .about-version-card {
  background: #F4EFE4;
  border-color: var(--archive-2);
  color: var(--archive-ink);
}

.page-about .about-version-card__yr {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--lime);
}

.page-about .about-archive[data-view="archive"] .about-version-card__yr {
  color: var(--lime-dim);
}

.page-about .about-version-card h3 {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  margin: 9px 0 8px;
}

.page-about .about-version-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.66;
  color: rgba(245, 247, 244, 0.72);
}

.page-about .about-archive[data-view="archive"] .about-version-card p {
  color: #4A463D;
}

/* ============ 图片 ============ */
.page-about .about-figure {
  margin: 22px 0 0;
}

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

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mute);
}

.page-about .about-archive__figure img {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-figure--paper img {
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
  box-shadow: 0 24px 0 -16px var(--archive-2);
}

/* ============ 折叠 ============ */
.page-about .about-fold {
  margin-top: 18px;
  background: rgba(23, 57, 47, 0.45);
  border: 1px solid var(--line);
}

.page-about .about-fold .fold-summary {
  padding: 14px 16px;
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-fold .fold-summary::marker {
  content: "";
}

.page-about .about-fold .fold-summary::before {
  content: "+";
  margin-right: 10px;
  font-family: var(--font-mono);
  color: var(--lime);
}

.page-about .about-fold[open] .fold-summary::before {
  content: "−";
}

.page-about .about-fold .fold-body {
  padding: 0 16px 16px;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(245, 247, 244, 0.75);
}

/* ============ 团队仪表板 ============ */
.page-about .about-dash {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 22px;
  background: var(--line);
  border: 1px solid var(--line);
}

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

.page-about .about-dash__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime);
}

.page-about .about-dash__label {
  display: block;
  margin-top: 9px;
  font-size: 12.5px;
  line-height: 1.5;
  letter-spacing: 0.06em;
  color: var(--mute);
}

/* ============ 伙伴清单 ============ */
.page-about .about-partners {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .about-partners li {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-partners__num {
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--orange);
  min-width: 2.6ch;
}

.page-about .about-partners__txt {
  font-size: 14.5px;
  line-height: 1.6;
  color: rgba(245, 247, 244, 0.78);
}

/* ============ 2026 计划 ============ */
.page-about .about-road {
  list-style: none;
  display: grid;
  gap: 12px;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .about-road li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 18px;
  background: linear-gradient(90deg, rgba(198, 242, 74, 0.08), transparent 62%);
  border-left: 2px solid var(--lime);
}

.page-about .about-road__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--orange);
  padding-top: 3px;
}

.page-about .about-road h3 {
  margin: 0 0 7px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-road p {
  margin: 0;
  font-size: 14px;
  line-height: 1.66;
  color: rgba(245, 247, 244, 0.74);
}

/* ============ 收尾入口 ============ */
.page-about .about-cta {
  margin-top: 34px;
  padding: 26px 22px 28px;
  background:
    radial-gradient(120% 130% at 0% 0%, rgba(198, 242, 74, 0.14), transparent 58%),
    var(--ink-2);
  border: 1px solid var(--line-lime);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
}

.page-about .about-cta__kicker {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .about-cta h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.18;
  letter-spacing: -0.015em;
  margin: 0 0 14px;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

/* ============ 断点 ============ */
@media (max-width: 899px) {
  .page-about .about-rail__track {
    position: static;
    flex-direction: row;
    gap: 6px;
    padding: 10px 0;
    border-left: 0;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    overflow-x: auto;
    scrollbar-width: none;
  }

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

  .page-about .rail-node {
    flex: 0 0 auto;
    padding: 7px 12px;
    border: 1px solid var(--line);
    border-radius: var(--radius-pill);
  }

  .page-about .rail-node.is-active {
    border-color: var(--line-lime);
  }

  .page-about .about-layout {
    padding-top: 28px;
  }
}

@media (min-width: 640px) {
  .page-about .about-version-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-principles {
    gap: 16px;
  }

  .page-about .about-archive {
    padding: 24px;
  }
}

@media (min-width: 760px) {
  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-dash {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 920px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 34px) 0 64px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.62fr) minmax(0, 1fr);
    gap: 52px;
    align-items: end;
  }

  .page-about .about-layout {
    padding-top: 60px;
    padding-bottom: 84px;
  }

  .page-about .about-section {
    padding: 46px 0;
  }

  .page-about .about-principles {
    margin-top: 26px;
  }

  .page-about .about-cta {
    padding: 34px 32px 36px;
  }
}
<<<END>>>