.page-about {
  --about-rail-w: 84px;
  --about-gap: 56px;
  --sec: var(--aoa-mint);
  background: var(--aoa-night);
  color: var(--aoa-cream);
  padding-bottom: 88px;
}

.page-about .about-shell {
  padding-top: 0;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  margin: 26px 0 34px;
}

/* ---------- 布局骨架：左窄右宽 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

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

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

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }
  .page-about .about-rail {
    display: block;
    grid-column: 1;
    grid-row: 1;
    align-self: start;
    position: sticky;
    top: calc(var(--aoa-header-h) + 30px);
  }
  .page-about .about-flow {
    grid-column: 2;
    grid-row: 1;
  }
}

/* ---------- 左侧年份刻度 ---------- */
.page-about .about-rail__cap {
  margin: 0 0 18px;
  font-family: var(--aoa-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--aoa-rock);
}

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

.page-about .about-rail__list::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--aoa-mint), rgba(94, 107, 224, 0.55) 58%, rgba(110, 122, 118, 0.18));
}

.page-about .about-rail__list li + li {
  margin-top: 30px;
}

.page-about .about-rail__list a {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--aoa-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--aoa-mist);
  text-decoration: none;
  transition: color var(--aoa-ease);
}

.page-about .about-rail__list a::before {
  content: "";
  flex: 0 0 7px;
  width: 7px;
  height: 7px;
  background: var(--aoa-rock);
  transition: background var(--aoa-ease), transform var(--aoa-ease);
}

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

.page-about .about-rail__list a:hover::before,
.page-about .about-rail__list a:focus-visible::before {
  background: var(--aoa-mint);
  transform: scale(1.3);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  padding-bottom: 52px;
}

@media (min-width: 880px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 44px;
    align-items: stretch;
  }
}

.page-about .about-hero__eyebrow {
  color: var(--aoa-mint);
  margin: 0;
}

.page-about .about-hero__title {
  font-family: var(--aoa-display);
  font-weight: 800;
  font-size: clamp(2rem, 4.6vw, 3.4rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin: 14px 0 20px;
  max-width: 20ch;
}

.page-about .about-hero__lead {
  margin: 0 0 30px;
  max-width: 60ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--aoa-mist);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--aoa-hairline-soft);
  background: var(--aoa-hairline-soft);
}

@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-stat {
  background: var(--aoa-night);
  padding: 15px 14px 16px;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--aoa-mono);
  font-weight: 700;
  font-size: clamp(1.55rem, 3vw, 2.15rem);
  line-height: 1.05;
  letter-spacing: 0.01em;
  color: var(--aoa-mint);
}

.page-about .about-stat__unit {
  margin-left: 0.08em;
  font-size: 0.48em;
  font-weight: 500;
  color: var(--aoa-mist);
}

.page-about .about-stat__cap {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--aoa-rock);
}

.page-about .about-hero__figure {
  margin: 0;
  padding: 8px;
  border: 1px solid var(--aoa-hairline);
  background: var(--aoa-board);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: 46px 0 50px;
  border-top: 1px solid var(--aoa-hairline-soft);
}

.page-about .about-flow > .about-sec:first-of-type {
  border-top: 0;
}

.page-about .about-sec--data { --sec: var(--aoa-mint); }
.page-about .about-sec--venue { --sec: var(--aoa-moss); }
.page-about .about-sec--flow { --sec: var(--aoa-amber); }
.page-about .about-sec--clause { --sec: var(--aoa-clay); }

.page-about .about-sec__kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--aoa-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--aoa-rock);
}

.page-about .about-sec__kicker::before {
  content: "";
  height: 4px;
  width: 18px;
  flex: 0 0 auto;
  background: var(--sec);
  transition: width var(--aoa-ease);
}

.page-about .about-flow > section:nth-of-type(1) .about-sec__kicker::before { width: 18px; }
.page-about .about-flow > section:nth-of-type(2) .about-sec__kicker::before { width: 28px; }
.page-about .about-flow > section:nth-of-type(3) .about-sec__kicker::before { width: 38px; }
.page-about .about-flow > section:nth-of-type(4) .about-sec__kicker::before { width: 48px; }
.page-about .about-flow > section:nth-of-type(5) .about-sec__kicker::before { width: 58px; }
.page-about .about-flow > section:nth-of-type(6) .about-sec__kicker::before { width: 68px; }

.page-about .about-sec h2 {
  position: relative;
  padding-left: 16px;
  margin: 0 0 22px;
}

.page-about .about-sec h2::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 2px;
  background: var(--aoa-amber);
  opacity: 0;
  transition: opacity var(--aoa-ease);
}

.page-about .about-sec h2:hover::after {
  opacity: 1;
}

.page-about .about-copy p {
  margin: 0 0 18px;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--aoa-mist);
}

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

/* ---------- 配图 ---------- */
.page-about .about-shot {
  margin: 28px 0 0;
  padding: 10px;
  border: 1px solid var(--aoa-hairline);
  background: var(--aoa-board);
}

.page-about .about-shot--narrow {
  max-width: 640px;
}

.page-about .about-shot img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-shot__cap {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--aoa-rock);
}

/* ---------- 团队三条线 ---------- */
.page-about .about-lines {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  margin-top: 26px;
}

@media (min-width: 820px) {
  .page-about .about-lines {
    grid-template-columns: minmax(0, 200px) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }
}

.page-about .about-lines__map {
  display: block;
  width: 100%;
  max-width: 200px;
  height: auto;
  border: 1px solid var(--aoa-hairline-soft);
  background: linear-gradient(180deg, rgba(44, 74, 59, 0.32), rgba(7, 19, 25, 0.72));
}

.page-about .about-lines__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-line {
  padding: 18px 0;
  border-top: 1px solid var(--aoa-hairline-soft);
}

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

.page-about .about-line__tag {
  display: inline-block;
  position: relative;
  padding-left: 12px;
  margin-bottom: 9px;
  font-family: var(--aoa-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--aoa-cream);
}

.page-about .about-line__tag::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.3em;
  bottom: 0.3em;
  width: 2px;
  background: var(--aoa-amber);
  opacity: 0;
  transition: opacity var(--aoa-ease);
}

.page-about .about-line:hover .about-line__tag::before,
.page-about .about-line:focus-within .about-line__tag::before {
  opacity: 1;
}

.page-about .about-line p {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--aoa-mist);
}

/* ---------- 纠错看板 ---------- */
.page-about .about-board {
  margin-top: 30px;
  padding: 22px 22px 20px;
  border-left: 4px solid var(--aoa-clay);
}

.page-about .about-board__label {
  margin: 0 0 10px;
  color: var(--aoa-amber);
}

.page-about .about-board__text {
  margin: 0 0 18px;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--aoa-mist);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-track {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .about-track__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 26px 0;
  border-top: 1px solid var(--aoa-hairline-soft);
  scroll-margin-top: calc(var(--aoa-header-h) + 28px);
}

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

@media (min-width: 720px) {
  .page-about .about-track__item {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 32px;
    align-items: start;
    padding: 30px 0;
  }
}

.page-about .about-track__year {
  font-family: var(--aoa-mono);
  font-weight: 700;
  font-size: clamp(1.7rem, 3.2vw, 2.5rem);
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--aoa-mint);
  transition: color var(--aoa-ease);
}

@media (min-width: 720px) {
  .page-about .about-track__year {
    text-align: right;
    padding-right: 22px;
    border-right: 1px solid var(--aoa-hairline-soft);
  }
}

.page-about .about-track__item:hover .about-track__year {
  color: var(--aoa-cream);
}

.page-about .about-track__body h3 {
  margin: 0 0 10px;
  font-family: var(--aoa-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--aoa-cream);
}

.page-about .about-track__body p {
  margin: 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--aoa-mist);
}

/* ---------- 节奏轴字段表 ---------- */
.page-about .about-axis-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--aoa-hairline-soft);
}

.page-about .about-axis-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 14px 0;
  border-bottom: 1px solid var(--aoa-hairline-soft);
}

@media (min-width: 620px) {
  .page-about .about-axis-list li {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

.page-about .about-axis-list__key {
  font-family: var(--aoa-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--aoa-mint);
}

.page-about .about-axis-list__val {
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--aoa-mist);
}

/* ---------- 收尾入口 ---------- */
.page-about .about-join {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  border: 1px solid var(--aoa-hairline-soft);
  background: var(--aoa-hairline-soft);
}

@media (min-width: 800px) {
  .page-about .about-join {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-join__item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  padding: 24px 22px 26px;
  background: var(--aoa-night);
  border-top: 3px solid var(--aoa-clay);
}

.page-about .about-join__item:nth-child(2) {
  border-top-color: var(--aoa-amber);
}

.page-about .about-join__item:nth-child(3) {
  border-top-color: var(--aoa-mint);
}

.page-about .about-join__item h3 {
  margin: 0;
  font-family: var(--aoa-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--aoa-cream);
}

.page-about .about-join__item p {
  margin: 0 0 6px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--aoa-mist);
}

.page-about .about-join__item .aoa-btn {
  margin-top: auto;
}

.page-about .about-tail {
  margin: 26px 0 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--aoa-mist);
  max-width: 64ch;
}

.page-about .about-tail a {
  color: var(--aoa-mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(59, 224, 176, 0.4);
  transition: border-color var(--aoa-ease), color var(--aoa-ease);
}

.page-about .about-tail a:hover,
.page-about .about-tail a:focus-visible {
  color: var(--aoa-amber);
  border-bottom-color: var(--aoa-amber);
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 480px) {
  .page-about .about-sec {
    padding: 34px 0 38px;
  }
  .page-about .about-board {
    padding: 18px 16px 18px;
  }
  .page-about .about-join__item {
    padding: 20px 16px 22px;
  }
}
<<<END>>>