.page-about {
  --rail-w: 172px;
  background-image:
    radial-gradient(90% 45% at 88% 0%, rgba(39, 245, 212, .07), transparent 62%),
    radial-gradient(70% 40% at 0% 34%, rgba(58, 174, 158, .06), transparent 60%);
  background-repeat: no-repeat;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(1rem, 3vw, 2rem) 0 clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.6rem, 4vw, 2.6rem);
  align-items: end;
}

.page-about .about-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 7vw, 4.35rem);
  line-height: 1.02;
  letter-spacing: -.035em;
  color: var(--paper);
  margin: .7rem 0 0;
  text-wrap: balance;
}

.page-about .about-title em {
  font-style: normal;
  color: var(--cyan);
}

.page-about .about-lede {
  margin: 1.1rem 0 0;
  max-width: 36em;
  font-size: clamp(1rem, 1.5vw, 1.06rem);
  line-height: 1.8;
  color: var(--paper);
}

.page-about .about-lede + .about-lede {
  margin-top: .9rem;
  color: var(--mute);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(.6rem, 2vw, 1.2rem);
  margin: clamp(1.6rem, 3.5vw, 2.4rem) 0 0;
  padding: clamp(1rem, 2.5vw, 1.3rem) 0 0;
  border-top: 1px solid var(--track);
}

.page-about .about-figure-item {
  margin: 0;
  min-width: 0;
}

.page-about .about-figure-label {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--mute);
  line-height: 1.4;
}

.page-about .about-figure-num {
  margin: .4rem 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(1.25rem, 3.4vw, 1.85rem);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .about-figure-num span {
  font-size: .55em;
  font-weight: 500;
  color: var(--mute);
  margin-left: .12em;
}

.page-about .about-hero-figure {
  margin: 0 auto;
  width: 100%;
  max-width: 400px;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-l);
  border: 1px solid var(--edge);
  background: var(--panel);
  overflow: hidden;
  box-shadow: 0 30px 70px -34px rgba(0, 0, 0, .85);
}

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

/* ---------- 主体布局 ---------- */
.page-about .about-body {
  padding: 0 0 clamp(3rem, 7vw, 5rem);
}

.page-about .about-body-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.6rem, 4vw, 2.6rem);
  align-items: start;
}

/* ---------- 左侧刻度 ---------- */
.page-about .about-rail {
  border-bottom: 1px solid var(--track);
  padding: 0 0 .8rem;
}

.page-about .about-rail-title {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  color: var(--mute);
  margin: 0 0 .7rem;
}

.page-about .about-rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: .45rem;
  overflow-x: auto;
  scrollbar-width: thin;
  padding-bottom: .15rem;
}

.page-about .about-rail-item {
  flex: 0 0 auto;
}

.page-about .about-rail-link {
  display: flex;
  align-items: baseline;
  gap: .45rem;
  padding: .34rem .7rem;
  border: 1px solid var(--track);
  border-radius: 999px;
  text-decoration: none;
  color: var(--mute);
  transition: color .16s var(--ease), border-color .16s var(--ease), background .16s var(--ease);
}

.page-about .about-rail-link:hover,
.page-about .about-rail-link:focus-visible {
  color: var(--paper);
  border-color: var(--edge);
}

.page-about .about-rail-year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .88rem;
  font-weight: 700;
  letter-spacing: .02em;
}

.page-about .about-rail-note {
  font-size: .7rem;
  letter-spacing: .06em;
  color: var(--mute);
}

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

.page-about .about-section + .about-section {
  margin-top: clamp(2.6rem, 6vw, 4.5rem);
}

.page-about .about-section-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 3.4vw, 2.05rem);
  line-height: 1.2;
  letter-spacing: -.022em;
  color: var(--paper);
  margin: .5rem 0 0;
  text-wrap: balance;
}

.page-about .prose {
  margin-top: clamp(.9rem, 2.4vw, 1.3rem);
  max-width: 41em;
}

.page-about .prose p {
  margin: 0 0 1em;
  font-size: clamp(.96rem, 1.3vw, 1.02rem);
  line-height: 1.8;
  color: var(--paper);
}

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

.page-about .about-pull {
  margin: clamp(1.4rem, 3.4vw, 2.1rem) 0 0;
  padding: clamp(1rem, 2.8vw, 1.5rem) clamp(1rem, 3vw, 1.6rem);
  border-left: 3px solid var(--cyan);
  border-radius: 0 var(--radius-m) var(--radius-m) 0;
  background: linear-gradient(100deg, rgba(39, 245, 212, .1), transparent 72%);
}

.page-about .about-pull p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.02rem, 2.5vw, 1.3rem);
  line-height: 1.55;
  letter-spacing: -.012em;
  color: var(--paper);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline-figure {
  margin: clamp(1.4rem, 3vw, 2rem) 0 0;
  aspect-ratio: 2 / 1;
  border: 1px solid var(--track);
  border-radius: var(--radius-m);
  background: var(--panel);
  overflow: hidden;
}

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

.page-about .about-stages {
  list-style: none;
  margin: clamp(1.1rem, 2.8vw, 1.6rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(.7rem, 2vw, 1rem);
}

.page-about .about-stage {
  position: relative;
  padding: clamp(.95rem, 2.4vw, 1.3rem);
  border: 1px solid var(--track);
  border-radius: var(--radius-m);
  background: var(--panel);
  scroll-margin-top: 132px;
  transition: border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-stage:target {
  border-color: var(--cyan);
  background: linear-gradient(160deg, rgba(39, 245, 212, .1), var(--panel) 62%);
  box-shadow: 0 0 0 1px rgba(39, 245, 212, .35) inset;
}

.page-about .about-stage-meta {
  display: flex;
  align-items: center;
  gap: .55rem;
  margin: 0 0 .55rem;
}

.page-about .about-stage-year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .95rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--gold);
}

.page-about .about-stage-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1rem, 2.2vw, 1.12rem);
  line-height: 1.4;
  letter-spacing: -.01em;
  color: var(--paper);
  margin: 0;
}

.page-about .about-stage-text {
  margin: .55rem 0 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--mute);
}

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.4rem, 3.4vw, 2.2rem);
  margin-top: clamp(.9rem, 2.4vw, 1.3rem);
  align-items: start;
}

.page-about .about-team-main {
  min-width: 0;
}

.page-about .about-roles {
  list-style: none;
  margin: clamp(1.2rem, 3vw, 1.7rem) 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--track);
  border: 1px solid var(--track);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-role {
  background: var(--ink);
  padding: clamp(.85rem, 2.2vw, 1.15rem);
}

.page-about .about-role-num {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 4vw, 1.95rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -.02em;
}

.page-about .about-role-num small {
  font-size: .42em;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--mute);
  margin-left: .3em;
}

.page-about .about-role-name {
  margin: .5rem 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: .98rem;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-role-text {
  margin: .35rem 0 0;
  font-size: .86rem;
  line-height: 1.7;
  color: var(--mute);
}

.page-about .about-team-figure {
  margin: 0;
  border: 1px solid var(--track);
  border-radius: var(--radius-m);
  background: var(--panel);
  overflow: hidden;
  aspect-ratio: 3 / 2;
}

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

/* ---------- 覆盖范围 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: clamp(1.2rem, 3vw, 1.8rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(.6rem, 2vw, 1rem);
}

.page-about .about-stat {
  padding: clamp(.85rem, 2.4vw, 1.15rem);
  border: 1px solid var(--track);
  border-radius: var(--radius-m);
  background: linear-gradient(180deg, rgba(18, 58, 50, .6), rgba(11, 43, 36, .25));
  min-width: 0;
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.4rem, 4.2vw, 2.05rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -.025em;
  color: var(--paper);
}

.page-about .about-stat-num em {
  font-style: normal;
  font-size: .46em;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--mute);
  margin-left: .22em;
}

.page-about .about-stat-label {
  display: block;
  margin-top: .45rem;
  font-size: .78rem;
  letter-spacing: .04em;
  line-height: 1.5;
  color: var(--mute);
}

/* ---------- 流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: clamp(1.2rem, 3vw, 1.8rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(.9rem, 2.4vw, 1.3rem);
}

.page-about .about-step {
  padding-top: 1rem;
  border-top: 1px solid var(--track);
}

.page-about .about-step-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .76rem;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .about-step-title {
  margin: .45rem 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-step-text {
  margin: .4rem 0 0;
  font-size: .89rem;
  line-height: 1.75;
  color: var(--mute);
}

/* ---------- 延伸入口 ---------- */
.page-about .about-next {
  padding-top: clamp(1.3rem, 3vw, 1.9rem);
  border-top: 1px solid var(--edge);
}

.page-about .about-next-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .7rem;
  margin-top: clamp(1rem, 2.6vw, 1.4rem);
}

.page-about .about-next-card {
  display: block;
  padding: clamp(.9rem, 2.4vw, 1.15rem) clamp(1rem, 2.6vw, 1.25rem);
  border: 1px solid var(--track);
  border-radius: var(--radius-m);
  background: var(--panel);
  text-decoration: none;
  transition: border-color .16s var(--ease), transform .16s var(--ease), background .16s var(--ease);
}

.page-about .about-next-card:hover,
.page-about .about-next-card:focus-visible {
  border-color: var(--cyan);
  background: linear-gradient(140deg, rgba(39, 245, 212, .09), var(--panel) 65%);
  transform: translateY(-2px);
}

.page-about .about-next-card-title {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-next-card-text {
  display: block;
  margin-top: .35rem;
  font-size: .87rem;
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 桌面端 ---------- */
@media (min-width: 860px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.42fr) minmax(230px, .58fr);
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-hero-figure {
    max-width: 100%;
    margin: 0;
  }

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

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(210px, .58fr);
  }

  .page-about .about-team-figure {
    aspect-ratio: 4 / 5;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-body-grid {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    gap: clamp(2.4rem, 5vw, 4.2rem);
  }

  .page-about .about-rail {
    position: sticky;
    top: clamp(96px, 13vh, 148px);
    align-self: start;
    border-bottom: 0;
    border-left: 1px solid var(--track);
    padding: 0 0 0 1rem;
  }

  .page-about .about-rail-list {
    display: grid;
    gap: .1rem;
    overflow: visible;
  }

  .page-about .about-rail-item {
    flex: none;
  }

  .page-about .about-rail-link {
    padding: .4rem 0 .4rem .7rem;
    margin-left: -1.05rem;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: .1rem;
  }

  .page-about .about-rail-link:hover,
  .page-about .about-rail-link:focus-visible {
    border-left-color: var(--edge);
  }

  .page-about .about-stage {
    scroll-margin-top: 118px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-stages {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

/* ---------- 目标定位高亮左侧刻度 ---------- */
.page-about:has(#stage-2021:target) .about-rail-link[href="#stage-2021"],
.page-about:has(#stage-2022:target) .about-rail-link[href="#stage-2022"],
.page-about:has(#stage-2023:target) .about-rail-link[href="#stage-2023"],
.page-about:has(#stage-2024:target) .about-rail-link[href="#stage-2024"] {
  color: var(--cyan);
  border-color: var(--cyan);
}

@media (min-width: 900px) {
  .page-about:has(#stage-2021:target) .about-rail-link[href="#stage-2021"],
  .page-about:has(#stage-2022:target) .about-rail-link[href="#stage-2022"],
  .page-about:has(#stage-2023:target) .about-rail-link[href="#stage-2023"],
  .page-about:has(#stage-2024:target) .about-rail-link[href="#stage-2024"] {
    background: linear-gradient(90deg, rgba(39, 245, 212, .12), transparent 80%);
  }
}

/* ---------- 焦点与减动 ---------- */
.page-about a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next-card:hover,
  .page-about .about-next-card:focus-visible {
    transform: none;
  }

  .page-about .about-rail-link,
  .page-about .about-stage,
  .page-about .about-next-card {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>