.page-about {
  --about-rail-w: 168px;
  --about-gap: 36px;
  background: var(--yj-ink);
  color: var(--yj-paper);
  font-family: var(--yj-font-body);
  padding-top: 0;
  overflow-x: hidden;
}
.page-about * {
  box-sizing: border-box;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--yj-header-h) + 26px) var(--yj-gutter) 46px;
  background:
    radial-gradient(120% 90% at 84% 0%, rgba(63, 242, 198, 0.13), transparent 62%),
    radial-gradient(90% 80% at 0% 100%, rgba(242, 184, 75, 0.09), transparent 60%),
    var(--yj-ink);
  overflow: hidden;
}
.page-about .about-hero__frame {
  position: relative;
  max-width: var(--yj-max);
  margin: 0 auto;
  display: grid;
  gap: 26px;
  padding: 30px 20px 24px;
  border: 1px solid rgba(157, 184, 174, 0.26);
  border-radius: 26px;
  background: linear-gradient(158deg, rgba(18, 59, 49, 0.62), rgba(7, 26, 21, 0.42));
  overflow: hidden;
}
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(63, 242, 198, 0.06) 0 1px, transparent 1px 84px),
    repeating-linear-gradient(0deg, rgba(63, 242, 198, 0.05) 0 1px, transparent 1px 84px);
}
.page-about .about-hero__body {
  position: relative;
  z-index: 1;
}
.page-about .about-hero__eyebrow {
  margin: 0 0 16px;
  font-family: var(--yj-font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--yj-mint);
}
.page-about .about-hero__year {
  margin: 0 0 10px;
  font-family: var(--yj-font-mono);
  font-weight: 700;
  font-size: clamp(54px, 13vw, 104px);
  line-height: 0.8;
  letter-spacing: -0.05em;
  color: rgba(63, 242, 198, 0.14);
  -webkit-text-stroke: 1.2px rgba(63, 242, 198, 0.55);
}
.page-about .about-hero__title {
  margin: 0 0 16px;
  font-family: var(--yj-font-display);
  font-weight: 800;
  font-size: clamp(28px, 5.6vw, 48px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--yj-paper);
}
.page-about .about-hero__lead {
  max-width: 34em;
  margin: 0 0 22px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--yj-mist);
}
.page-about .about-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-hero__chip {
  padding: 6px 14px;
  border-radius: var(--yj-radius-pill);
  border: 1px solid rgba(242, 184, 75, 0.38);
  background: rgba(242, 184, 75, 0.08);
  color: var(--yj-gold);
  font-size: 12.5px;
  line-height: 1.5;
}
.page-about .about-hero__figure {
  position: relative;
  z-index: 1;
  margin: 0;
  border-radius: var(--yj-radius-md);
  border: 1px solid rgba(157, 184, 174, 0.24);
  background: var(--yj-ink-deep);
  overflow: hidden;
}
.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-hero__caption {
  padding: 10px 14px;
  font-family: var(--yj-font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--yj-mist);
  border-top: 1px solid rgba(157, 184, 174, 0.18);
}

/* ---------- 外壳与刻度栏 ---------- */
.page-about .about-shell {
  max-width: var(--yj-max);
  margin: 0 auto;
  padding: 4px var(--yj-gutter) 64px;
  display: grid;
  gap: 14px;
}
.page-about .about-rail {
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.page-about .about-rail::-webkit-scrollbar {
  display: none;
}
.page-about .about-rail__sticky {
  min-width: max-content;
  padding: 2px 0 6px;
}
.page-about .about-rail__label {
  display: none;
}
.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-rail__node {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--yj-radius-pill);
  border: 1px solid rgba(157, 184, 174, 0.28);
  color: var(--yj-mist);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--yj-ease), border-color 0.2s var(--yj-ease), background 0.2s var(--yj-ease);
}
.page-about .about-rail__node:hover,
.page-about .about-rail__node:focus-visible {
  color: var(--yj-mint);
  border-color: rgba(63, 242, 198, 0.55);
  background: rgba(63, 242, 198, 0.08);
}
.page-about .about-rail__idx {
  font-family: var(--yj-font-mono);
  font-size: 11px;
  color: var(--yj-gold);
}

/* ---------- 章节面板 ---------- */
.page-about .about-panel {
  position: relative;
  border-radius: var(--yj-radius-lg);
  padding: 26px 20px;
  margin-bottom: 16px;
  overflow: hidden;
  scroll-margin-top: calc(var(--yj-header-h) + 24px);
}
.page-about .about-panel:last-child {
  margin-bottom: 0;
}
.page-about .about-panel--paper {
  background: var(--yj-paper);
  color: var(--yj-ink);
}
.page-about .about-panel--ink {
  background: var(--yj-panel);
  color: var(--yj-paper);
  border: 1px solid rgba(157, 184, 174, 0.16);
}
.page-about .about-panel__ghost {
  position: absolute;
  top: 2px;
  right: 14px;
  font-family: var(--yj-font-mono);
  font-weight: 700;
  font-size: 84px;
  line-height: 1;
  color: currentColor;
  opacity: 0.06;
  pointer-events: none;
  user-select: none;
}
.page-about .about-panel__kicker {
  margin: 0 0 10px;
  font-family: var(--yj-font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--yj-print);
}
.page-about .about-panel--ink .about-panel__kicker {
  color: var(--yj-mint);
}
.page-about .about-panel__title {
  margin: 0 0 16px;
  font-family: var(--yj-font-display);
  font-weight: 800;
  font-size: clamp(23px, 4.4vw, 34px);
  line-height: 1.22;
  letter-spacing: -0.02em;
}
.page-about .about-panel p {
  max-width: 40em;
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.78;
}
.page-about .about-panel--ink p {
  color: rgba(244, 235, 221, 0.86);
}
.page-about .about-panel__note {
  margin: 16px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--yj-print);
  font-size: 14px !important;
  color: var(--yj-paper-gray) !important;
}

/* ---------- 版本胶囊 ---------- */
.page-about .about-vers {
  margin-top: 22px;
  display: grid;
  gap: 10px;
}
.page-about .about-ver {
  border: 1px solid rgba(157, 184, 174, 0.22);
  border-radius: var(--yj-radius-md);
  background: rgba(7, 26, 21, 0.5);
  overflow: hidden;
  transition: border-color 0.2s var(--yj-ease), background 0.2s var(--yj-ease);
}
.page-about .about-ver[open] {
  border-color: rgba(63, 242, 198, 0.5);
  background: rgba(15, 61, 53, 0.62);
}
.page-about .about-ver__summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 14px;
  cursor: pointer;
  list-style: none;
}
.page-about .about-ver__summary::-webkit-details-marker {
  display: none;
}
.page-about .about-ver__summary::after {
  content: "＋";
  flex: none;
  font-family: var(--yj-font-mono);
  font-size: 13px;
  color: var(--yj-mist);
}
.page-about .about-ver[open] .about-ver__summary::after {
  content: "－";
  color: var(--yj-mint);
}
.page-about .about-ver__tag {
  flex: none;
  padding: 4px 10px;
  border-radius: var(--yj-radius-pill);
  border: 1px solid rgba(63, 242, 198, 0.32);
  background: rgba(63, 242, 198, 0.13);
  color: var(--yj-mint);
  font-family: var(--yj-font-mono);
  font-size: 12.5px;
  font-weight: 700;
  line-height: 1.4;
}
.page-about .about-ver__name {
  flex: 1 1 auto;
  font-size: 15px;
  font-weight: 700;
  color: var(--yj-paper);
  line-height: 1.4;
}
.page-about .about-ver__year {
  flex: none;
  font-family: var(--yj-font-mono);
  font-size: 12px;
  color: var(--yj-gold);
}
.page-about .about-ver__body {
  padding: 0 14px 15px;
}
.page-about .about-ver__body p {
  margin: 0;
  max-width: none;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--yj-mist);
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 20px;
  margin-top: 4px;
}
.page-about .about-split__main p:last-child {
  margin-bottom: 0;
}
.page-about .about-figure {
  margin: 0;
  border-radius: var(--yj-radius-md);
  border: 1px solid rgba(79, 107, 98, 0.28);
  background: var(--yj-ink-deep);
  overflow: hidden;
}
.page-about .about-panel--ink .about-figure {
  border-color: rgba(157, 184, 174, 0.22);
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 流程胶囊 ---------- */
.page-about .about-flow {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-flow__step {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border-radius: var(--yj-radius-pill);
  border: 1px solid rgba(79, 107, 98, 0.28);
  background: var(--yj-paper-edge);
  color: var(--yj-ink);
  font-size: 14px;
  font-weight: 600;
}
.page-about .about-flow__n {
  font-family: var(--yj-font-mono);
  font-size: 12px;
  color: var(--yj-print);
}

/* ---------- 数据格 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 22px;
}
.page-about .about-stat {
  padding: 15px 13px;
  border-radius: var(--yj-radius-md);
  background: var(--yj-paper-edge);
  border: 1px solid rgba(79, 107, 98, 0.18);
}
.page-about .about-panel--ink .about-stat {
  background: rgba(7, 26, 21, 0.5);
  border-color: rgba(157, 184, 174, 0.18);
}
.page-about .about-stat__num {
  display: block;
  font-family: var(--yj-font-mono);
  font-weight: 700;
  font-size: clamp(21px, 3.4vw, 28px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--yj-print);
}
.page-about .about-panel--ink .about-stat__num {
  color: var(--yj-mint);
}
.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--yj-paper-gray);
}
.page-about .about-panel--ink .about-stat__label {
  color: var(--yj-mist);
}

/* ---------- 行动区 ---------- */
.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 20px;
  margin: 24px 0 0;
}
.page-about .about-link {
  color: var(--yj-gold);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 184, 75, 0.42);
  padding-bottom: 2px;
  transition: color 0.2s var(--yj-ease), border-color 0.2s var(--yj-ease);
}
.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--yj-mint);
  border-color: rgba(63, 242, 198, 0.6);
}
.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid rgba(157, 184, 174, 0.2);
}
.page-about .about-links a {
  color: var(--yj-mist);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s var(--yj-ease);
}
.page-about .about-links a:hover,
.page-about .about-links a:focus-visible {
  color: var(--yj-mint);
}

/* ---------- 焦点可见 ---------- */
.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--yj-mint);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: calc(var(--yj-header-h) + 34px) var(--yj-gutter) 58px;
  }
  .page-about .about-hero__frame {
    padding: 38px 30px 30px;
  }
  .page-about .about-panel {
    padding: 34px 30px;
    margin-bottom: 20px;
  }
  .page-about .about-panel__ghost {
    font-size: 110px;
    right: 22px;
  }
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }
  .page-about .about-split {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: start;
    gap: 26px;
  }
  .page-about .about-split--rev {
    grid-template-columns: 0.9fr 1.1fr;
  }
}

/* ---------- 桌面分屏 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__frame {
    grid-template-columns: 1.06fr 0.94fr;
    align-items: end;
    gap: 40px;
    padding: 46px 40px 40px;
  }
  .page-about .about-hero__lead {
    font-size: 17px;
  }
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-gap);
    padding-top: 22px;
    padding-bottom: 88px;
    align-items: start;
  }
  .page-about .about-rail {
    overflow: visible;
  }
  .page-about .about-rail__sticky {
    position: sticky;
    top: calc(var(--yj-header-h) + 30px);
    min-width: 0;
    padding: 0;
  }
  .page-about .about-rail__label {
    display: block;
    margin: 0 0 14px;
    font-family: var(--yj-font-mono);
    font-size: 11px;
    letter-spacing: 0.2em;
    color: var(--yj-mist);
  }
  .page-about .about-rail__list {
    display: block;
    position: relative;
    padding-left: 18px;
    border-left: 1px solid rgba(157, 184, 174, 0.24);
  }
  .page-about .about-rail__node {
    display: block;
    position: relative;
    margin-bottom: 16px;
    padding: 4px 0 4px 0;
    border: 0;
    background: none;
    border-radius: 6px;
    white-space: normal;
    font-size: 13.5px;
  }
  .page-about .about-rail__node:hover,
  .page-about .about-rail__node:focus-visible {
    background: none;
    color: var(--yj-mint);
  }
  .page-about .about-rail__node::before {
    content: "";
    position: absolute;
    left: -23px;
    top: 10px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--yj-mist);
    opacity: 0.5;
    transition: background 0.2s var(--yj-ease), box-shadow 0.2s var(--yj-ease), opacity 0.2s var(--yj-ease);
  }
  .page-about .about-rail__node:hover::before,
  .page-about .about-rail__node:focus-visible::before {
    background: var(--yj-mint);
    opacity: 1;
    box-shadow: 0 0 0 4px rgba(63, 242, 198, 0.18);
  }
  .page-about .about-rail__idx {
    display: inline-block;
    margin-right: 7px;
  }
  .page-about .about-panel {
    padding: 44px 40px;
    margin-bottom: 26px;
  }
  .page-about .about-panel__ghost {
    font-size: 130px;
    right: 26px;
  }
  .page-about .about-panel p {
    font-size: 16.5px;
  }
}

/* ---------- 减动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__node,
  .page-about .about-ver,
  .page-about .about-link,
  .page-about .about-links a {
    transition: none;
  }
}
<<<END>>