.page-about {
  --about-rail-w: 190px;
  --about-hair: 1px;
  display: block;
  background-color: var(--c-deep);
  color: var(--c-text);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
  font-size: 12px;
  margin-bottom: 18px;
}
.page-about .breadcrumb__sep {
  margin: 0 6px;
  font-family: var(--font-mono);
  color: var(--c-line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 4vw, 40px) 0 clamp(34px, 6vw, 68px);
  background:
    radial-gradient(120% 90% at 88% 4%, rgba(0, 229, 196, 0.16), transparent 56%),
    radial-gradient(80% 70% at 2% 98%, rgba(124, 92, 255, 0.14), transparent 58%),
    linear-gradient(180deg, var(--c-hull) 0%, var(--c-deep) 80%);
  border-bottom: 1px solid var(--c-line);
}
.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
}
.page-about .about-hero__title {
  margin: 14px 0 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(32px, 7vw, 62px);
  line-height: 1.03;
  letter-spacing: 0.05em;
  color: var(--c-text);
  max-width: 16ch;
}
.page-about .about-hero__lead {
  margin: 0 0 22px;
  max-width: 46ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--c-soft);
}
.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-hero__figure {
  margin: 0;
}
.page-about .about-hero__figure .figure__frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--c-line);
  background: var(--c-panel);
}
.page-about .about-hero__figure .figure__frame::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 88px;
  height: 4px;
  background: var(--c-cyan);
}
.page-about .about-hero__figure .figure__img {
  aspect-ratio: 14 / 9;
}

/* ---------- 通用图片 ---------- */
.page-about .figure {
  margin: 0;
}
.page-about .figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}
.page-about .figure__frame {
  overflow: hidden;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
}
.page-about .figure__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--c-muted);
}
.page-about .about-chapter__figure {
  margin: clamp(20px, 3vw, 32px) 0 0;
}
.page-about .about-versions__figure .figure__img {
  aspect-ratio: 3 / 4;
}

/* ---------- 主体两栏 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  padding-top: clamp(30px, 5vw, 64px);
  padding-bottom: clamp(40px, 7vw, 88px);
}

/* ---------- 侧边索引 ---------- */
.page-about .about-rail {
  border-top: 2px solid var(--c-cyan);
  padding-top: 12px;
}
.page-about .about-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-muted);
}
.page-about .about-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: rail;
}
.page-about .about-rail__link {
  display: inline-block;
  padding: 4px 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .about-rail__link::before {
  counter-increment: rail;
  content: counter(rail, decimal-leading-zero);
  margin-right: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-line);
}
.page-about .about-rail__link:hover {
  color: var(--c-cyan-soft);
}
.page-about .about-rail__link[aria-current="true"] {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}
.page-about .about-rail__link[aria-current="true"]::before {
  color: var(--c-cyan);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding: clamp(26px, 4vw, 46px) 0;
  border-top: 1px solid var(--c-line);
}
.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 12px 20px;
  margin-bottom: clamp(16px, 2.4vw, 26px);
}
.page-about .about-chapter__index {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-cyan);
}
.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 3.6vw, 38px);
  line-height: 1.16;
  letter-spacing: 0.04em;
  color: var(--c-text);
}
.page-about .about-chapter__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 5vw, 50px);
  line-height: 0.9;
  letter-spacing: 0.02em;
  color: rgba(18, 64, 92, 0.9);
  -webkit-text-stroke: 1px var(--c-line);
  user-select: none;
}
.page-about .about-chapter__body > p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--c-soft);
}

/* ---------- 衬线引言 ---------- */
.page-about .about-quote {
  margin: clamp(20px, 3vw, 30px) 0;
  padding: 2px 0 2px clamp(16px, 2.4vw, 24px);
  border-left: 2px solid var(--c-cyan);
  max-width: 32ch;
  font-family: var(--font-serif);
  font-size: clamp(17px, 2.1vw, 23px);
  line-height: 1.6;
  color: var(--c-text);
}

/* ---------- 数据标签收束 ---------- */
.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 四个小组 ---------- */
.page-about .about-teams {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--c-line);
}
.page-about .about-teams .index-item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 6px 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--c-line);
}
.page-about .about-teams .index-item__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-cyan);
}
.page-about .about-teams .index-item__title {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--c-text);
}
.page-about .about-teams .index-item__meta {
  grid-column: 2 / -1;
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-muted);
}

/* ---------- 内容生产链 ---------- */
.page-about .about-pipeline.timeline {
  display: grid;
  gap: 22px;
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  padding: 0 0 0 24px;
  list-style: none;
  border-left: 1px solid var(--c-line);
}
.page-about .about-pipeline .timeline__node {
  position: relative;
}
.page-about .about-pipeline .timeline__node::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: 0 0 0 3px rgba(0, 229, 196, 0.16);
}
.page-about .about-pipeline .timeline__time {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-cyan);
}
.page-about .about-pipeline .timeline__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
  color: var(--c-text);
}
.page-about .about-pipeline .timeline__note {
  margin: 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-muted);
}

/* ---------- 用户数据 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  padding: 0;
  list-style: none;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}
.page-about .about-stats .metric {
  padding: 18px 16px;
  background: var(--c-hull);
}
.page-about .about-stats .metric__value {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.1;
  letter-spacing: 0.04em;
  color: var(--c-text);
}
.page-about .about-stats .metric--accent .metric__value {
  color: var(--c-cyan);
}
.page-about .about-stats .metric__label {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-muted);
}

/* ---------- 版本迭代 ---------- */
.page-about .about-versions {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  margin-bottom: clamp(16px, 2.4vw, 24px);
}
.page-about .about-versions .timeline {
  display: grid;
  gap: 20px;
  margin: 0;
  padding: 0 0 0 24px;
  list-style: none;
  border-left: 1px solid var(--c-line);
}
.page-about .about-versions .timeline__node {
  position: relative;
}
.page-about .about-versions .timeline__node::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 6px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-line);
}
.page-about .about-versions .timeline__node--flag::before {
  background: var(--c-orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 43, 0.16);
}
.page-about .about-versions .timeline__time {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
}
.page-about .about-versions .timeline__node--flag .timeline__time {
  color: var(--c-orange);
}
.page-about .about-versions .timeline__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
  color: var(--c-text);
}
.page-about .about-versions .timeline__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-muted);
}

/* ---------- 支持与反馈 ---------- */
.page-about .about-support {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(16px, 2.4vw, 24px);
}
.page-about .about-support__card {
  padding: 18px 20px;
  background: linear-gradient(160deg, var(--c-panel), var(--c-hull));
  border-left: 3px solid var(--c-cyan);
}
.page-about .about-support__card--alt {
  border-left-color: var(--c-orange);
}
.page-about .about-support__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--c-cyan);
}
.page-about .about-support__card--alt .about-support__num {
  color: var(--c-orange);
}
.page-about .about-support__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-soft);
}
.page-about .aside-note {
  margin: 0;
  padding: 14px 18px;
  background: rgba(11, 39, 64, 0.6);
  border-left: 2px solid var(--c-amber);
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-soft);
  max-width: 68ch;
}

/* ---------- 正文链接 ---------- */
.page-about .about-link {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 196, 0.4);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}
.page-about .about-link:hover {
  color: var(--c-cyan-soft);
  border-bottom-color: var(--c-cyan-soft);
}

/* ---------- 结尾 ---------- */
.page-about .about-outro {
  padding: clamp(34px, 5vw, 64px) 0;
  border-top: 1px solid var(--c-line);
  background:
    radial-gradient(90% 130% at 10% 0%, rgba(0, 229, 196, 0.13), transparent 58%),
    radial-gradient(70% 110% at 92% 100%, rgba(255, 106, 43, 0.1), transparent 60%),
    var(--c-hull);
}
.page-about .about-outro__kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-cyan);
}
.page-about .about-outro__title {
  margin: 0 0 14px;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 4vw, 42px);
  line-height: 1.14;
  letter-spacing: 0.04em;
  color: var(--c-text);
}
.page-about .about-outro__text {
  margin: 0 0 24px;
  max-width: 58ch;
  font-size: clamp(15px, 1.5vw, 16px);
  line-height: 1.78;
  color: var(--c-soft);
}
.page-about .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about .about-teams .index-item {
    grid-template-columns: 56px minmax(0, 1fr) minmax(0, 1.5fr);
    align-items: baseline;
    gap: 6px 20px;
  }
  .page-about .about-teams .index-item__meta {
    grid-column: 3 / -1;
  }
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-support {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: end;
  }
  .page-about .about-versions {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

/* ---------- 桌面两栏 ---------- */
@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 76px);
    align-items: start;
  }
  .page-about .about-rail {
    position: sticky;
    top: 96px;
  }
  .page-about .about-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }
  .page-about .about-rail__link::before {
    margin-right: 10px;
  }
}
<<<END>>>