.page-about {
  --about-rail-w: 206px;
  --about-ink-soft: rgba(244, 241, 232, .76);
  --about-ink-dim: rgba(244, 241, 232, .58);
  background: var(--night);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.5rem, 4vw, 3rem) 0 clamp(2rem, 4.5vw, 3.25rem);
  border-bottom: 1px solid var(--line);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -55%;
  right: -18%;
  width: min(46rem, 90vw);
  height: min(46rem, 90vw);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(200, 255, 61, .10), transparent 62%);
  pointer-events: none;
}
.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2rem;
  align-items: end;
}
.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  margin: 1.1rem 0 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--sand);
}
.page-about .about-kicker__dot {
  width: 9px;
  height: 9px;
  background: var(--lime);
  flex: 0 0 auto;
}
.page-about .about-title {
  margin: .8rem 0 1rem;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2rem, 6.2vw, 4.2rem);
  line-height: 1.04;
  letter-spacing: -.01em;
}
.page-about .about-title em {
  display: block;
  font-style: normal;
  font-weight: 400;
  color: var(--lime);
}
.page-about .about-hero .lede {
  max-width: 48ch;
  color: var(--about-ink-soft);
  font-size: clamp(.95rem, 1.4vw, 1.05rem);
  line-height: 1.85;
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.6rem;
}
.page-about .about-hero__visual {
  border: 1px solid var(--line);
  background: linear-gradient(160deg, var(--deep), var(--panel));
  padding: .7rem;
  box-shadow: var(--shadow-panel);
}
.page-about .about-hero__visual svg {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 数据条 ---------- */
.page-about .about-stats {
  padding: clamp(1.25rem, 3vw, 1.9rem) 0;
  background: var(--deep);
  border-bottom: 1px solid var(--line);
}
.page-about .about-stats__row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem 1rem;
  margin: 0;
}
.page-about .about-stat dt {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}
.page-about .about-stat dd {
  margin: .35rem 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.55rem, 3.6vw, 2.2rem);
  line-height: 1;
  color: var(--paper);
}
.page-about .about-stat dd span {
  margin-left: .25em;
  font-family: var(--font-body);
  font-size: .62em;
  color: var(--lime);
}

/* ---------- 主体：索引 + 章节 ---------- */
.page-about .about-body {
  padding: clamp(1.5rem, 4vw, 3rem) 0 clamp(2.5rem, 6vw, 4.5rem);
}
.page-about .about-body__inner {
  display: grid;
  gap: 2rem;
}
.page-about .about-rail {
  border-left: 2px solid var(--lime);
  padding-left: .9rem;
}
.page-about .about-rail__label {
  margin: 0 0 .7rem;
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--sand);
}
.page-about .about-rail__nav {
  display: flex;
  gap: .35rem;
  overflow-x: auto;
  padding-bottom: .3rem;
  scrollbar-width: thin;
}
.page-about .about-rail__link {
  flex: 0 0 auto;
  display: block;
  padding: .38rem .55rem;
  border: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--lime);
  border-color: var(--lime-line);
  outline: none;
}

.page-about .about-chapter {
  padding: clamp(1.75rem, 3.6vw, 3rem) 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .chapter-head {
  display: flex;
  align-items: baseline;
  gap: .85rem;
  margin-bottom: 1.1rem;
}
.page-about .chapter-no {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .16em;
  color: var(--sand);
  flex: 0 0 auto;
}
.page-about .chapter-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.4rem, 3.4vw, 2.15rem);
  line-height: 1.15;
  color: var(--paper);
}
.page-about .about-chapter .prose {
  max-width: 62ch;
  margin: 0 0 1.2rem;
  color: var(--about-ink-soft);
  font-size: .95rem;
  line-height: 1.9;
}

/* ---------- 图片框 ---------- */
.page-about .about-figure {
  margin: 0 0 1.4rem;
  padding: .45rem;
  border: 1px solid var(--line);
  background: var(--panel);
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-figure figcaption {
  padding: .55rem .2rem .2rem;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .06em;
  color: var(--muted);
}
.page-about .about-figure--wide {
  margin-top: 1.5rem;
}
.page-about .about-figure--side {
  margin: 0;
}

/* ---------- 品牌主张要点 ---------- */
.page-about .about-points {
  display: grid;
  gap: 1.1rem;
  margin: 1.5rem 0 0;
  padding: 0;
}
.page-about .about-point {
  border-top: 2px solid var(--lime-line);
  padding-top: .7rem;
}
.page-about .about-point dt {
  font-size: .96rem;
  font-weight: 600;
  color: var(--paper);
}
.page-about .about-point dd {
  margin: .4rem 0 0;
  font-size: .88rem;
  line-height: 1.75;
  color: var(--about-ink-dim);
}

/* ---------- 团队 ---------- */
.page-about .team-split {
  display: grid;
  gap: 1.6rem;
}
.page-about .role-list {
  margin-top: 1.2rem;
  border-top: 1px solid var(--line-soft);
}
.page-about .role {
  border-bottom: 1px solid var(--line-soft);
}
.page-about .role summary {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .85rem .15rem;
  cursor: pointer;
  list-style: none;
  color: var(--paper);
  font-size: .96rem;
}
.page-about .role summary::-webkit-details-marker {
  display: none;
}
.page-about .role summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}
.page-about .role__mark {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  border: 1px solid var(--lime-line);
}
.page-about .role__mark::before,
.page-about .role__mark::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 3px;
  right: 3px;
  height: 1px;
  background: var(--lime);
  transform: translateY(-50%);
}
.page-about .role__mark::after {
  transform: translateY(-50%) rotate(90deg);
  transition: transform .22s var(--ease);
}
.page-about .role[open] .role__mark::after {
  transform: translateY(-50%) rotate(0deg);
}
.page-about .role__name {
  font-weight: 600;
}
.page-about .role__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--lime);
}
.page-about .role p {
  margin: 0 0 1rem;
  padding-left: 1.55rem;
  font-size: .88rem;
  line-height: 1.8;
  color: var(--about-ink-dim);
  max-width: 60ch;
}

/* ---------- 时间线 ---------- */
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  margin: 0 0 1.1rem;
}
.page-about .filter-btn {
  padding: .42rem .78rem;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .06em;
  cursor: pointer;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}
.page-about .filter-btn:hover {
  color: var(--paper);
  border-color: var(--lime-line);
}
.page-about .filter-btn[aria-pressed="true"] {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink);
  font-weight: 600;
}
.page-about .filter-note {
  margin: 0 0 0 auto;
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--muted);
}
.page-about .filter-note [data-filter-count] {
  color: var(--sand);
}

.page-about .timeline {
  display: flex;
  gap: .9rem;
  overflow-x: auto;
  padding: .3rem .3rem 1.3rem;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
}
.page-about .timeline__item {
  flex: 0 0 min(19rem, 78vw);
  scroll-snap-align: start;
}
.page-about .timeline__item[hidden] {
  display: none;
}
.page-about .timeline__card {
  height: 100%;
  padding: 1.1rem 1.15rem 1.2rem;
  border: 1px solid rgba(11, 43, 36, .16);
  background: var(--paper);
  color: var(--ink);
  box-shadow: var(--shadow-paper);
  transition: transform .25s var(--ease);
}
.page-about .timeline__item:nth-child(odd) .timeline__card {
  transform: rotate(-.4deg);
}
.page-about .timeline__item:nth-child(even) .timeline__card {
  transform: rotate(.5deg);
}
.page-about .timeline__card:hover {
  transform: rotate(0deg) translateY(-3px);
}
.page-about .timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.85rem;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ink);
}
.page-about .timeline__title {
  margin: .5rem 0 .45rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: .02em;
  color: var(--ink);
}
.page-about .timeline__text {
  margin: 0;
  font-size: .84rem;
  line-height: 1.75;
  color: rgba(11, 43, 36, .78);
}
.page-about .timeline__tag {
  display: inline-block;
  margin-top: .8rem;
  padding: .14rem .42rem;
  border: 1px solid rgba(11, 43, 36, .26);
  font-family: var(--font-mono);
  font-size: .64rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: rgba(11, 43, 36, .68);
}

/* ---------- 谁在用 ---------- */
.page-about .audience-grid {
  display: grid;
  gap: .9rem;
}
.page-about .audience-card {
  padding: 1.15rem 1.2rem 1.3rem;
  border: 1px solid var(--line);
  background: linear-gradient(168deg, var(--panel), var(--deep));
  position: relative;
}
.page-about .audience-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 1.2rem;
  width: 34px;
  height: 2px;
  background: var(--sand);
}
.page-about .audience-card__who {
  margin: .2rem 0 .55rem;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}
.page-about .audience-card__title {
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.16rem;
  line-height: 1.28;
  color: var(--paper);
}
.page-about .audience-card p {
  margin: 0;
  font-size: .87rem;
  line-height: 1.78;
  color: var(--about-ink-dim);
}
.page-about .audience-card__title + p {
  color: var(--about-ink-soft);
}

/* ---------- 荣誉 ---------- */
.page-about .honor-wrap {
  display: grid;
  gap: 1.6rem;
  align-items: start;
}
.page-about .honor-seal {
  width: clamp(132px, 34vw, 172px);
  height: auto;
}
.page-about .honor-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}
.page-about .honor-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .3rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .honor-item:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .honor-item__year {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--sand);
}
.page-about .honor-item__title {
  margin: .2rem 0 .35rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--paper);
}
.page-about .honor-item p {
  margin: 0;
  font-size: .87rem;
  line-height: 1.78;
  color: var(--about-ink-dim);
  max-width: 54ch;
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding: clamp(2rem, 5vw, 3.4rem) 0;
  border-top: 1px solid var(--line);
  background: var(--deep);
}
.page-about .about-cta__inner {
  display: grid;
  gap: 1.4rem;
}
.page-about .about-cta__label {
  margin: 0 0 .6rem;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--sand);
}
.page-about .about-cta__title {
  margin: 0 0 .7rem;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.5rem, 3.8vw, 2.4rem);
  line-height: 1.15;
  color: var(--paper);
}
.page-about .about-cta__copy p {
  margin: 0;
  max-width: 56ch;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
}
.page-about .about-cta__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .74rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .about-stats__row {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
  }
  .page-about .about-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.2rem;
  }
  .page-about .audience-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .honor-item {
    grid-template-columns: 7.5rem minmax(0, 1fr);
    gap: 1rem;
  }
  .page-about .honor-item__year {
    padding-top: .15rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    gap: clamp(2rem, 5vw, 4rem);
  }
  .page-about .team-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: clamp(1.6rem, 3vw, 2.6rem);
    align-items: start;
  }
  .page-about .honor-wrap {
    grid-template-columns: auto minmax(0, 1fr);
    gap: clamp(1.5rem, 4vw, 3rem);
  }
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .7fr);
    align-items: center;
    gap: 1.6rem 2.5rem;
  }
  .page-about .about-cta__note {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body__inner {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: start;
  }
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 1.25rem);
    align-self: start;
  }
  .page-about .about-rail__nav {
    flex-direction: column;
    overflow: visible;
    gap: .1rem;
    padding-bottom: 0;
  }
  .page-about .about-rail__link {
    white-space: normal;
  }
}

@media (min-width: 1100px) {
  .page-about .audience-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
  .page-about .audience-card:nth-child(1) {
    grid-column: span 4;
  }
  .page-about .audience-card:nth-child(2) {
    grid-column: span 2;
  }
  .page-about .audience-card:nth-child(3) {
    grid-column: span 2;
  }
  .page-about .audience-card:nth-child(4) {
    grid-column: span 4;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__card,
  .page-about .role__mark::after,
  .page-about .filter-btn,
  .page-about .about-rail__link {
    transition: none;
  }
  .page-about .timeline__item:nth-child(odd) .timeline__card,
  .page-about .timeline__item:nth-child(even) .timeline__card {
    transform: none;
  }
}
<<<END>>>