.page-about {
  padding-bottom: 80px;
  color: var(--bone);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: 22px;
}

.page-about .crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .crumbs__item a {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.page-about .crumbs__item a:hover,
.page-about .crumbs__item a:focus-visible {
  color: var(--whistle);
}

.page-about .crumbs__item--current {
  color: var(--bone);
}

.page-about .crumbs__sep {
  color: var(--line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 36px 0 44px;
}

.page-about .about-hero__title {
  margin: 18px 0 0;
  max-width: 20ch;
  font-family: var(--font-sans);
  font-weight: 200;
  font-size: clamp(28px, 8.2vw, 66px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--bone);
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .about-hero__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 30px 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-figure {
  margin: 0;
  padding: 13px 15px 15px;
  background: var(--ink);
}

.page-about .about-figure__label {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .about-figure__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--whistle);
}

/* ---------- 区块骨架 ---------- */
.page-about .about-block {
  margin: 0;
  padding: 52px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-block__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 22px;
}

.page-about .idx {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-block__title {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: clamp(20px, 4.6vw, 32px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.page-about .about-prose {
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.65;
  color: var(--bone);
}

.page-about .about-prose p {
  margin: 0 0 14px;
}

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

.page-about .about-prose--tight {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px dashed var(--line);
  font-size: 14px;
  color: var(--mist);
}

/* ---------- 通栏图 ---------- */
.page-about .about-wide {
  position: relative;
  margin: 0 0 32px;
  border: 1px solid var(--line);
  background: var(--board);
  overflow: hidden;
}

.page-about .about-wide::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(120% 92% at 50% 42%, transparent 42%, rgba(6, 26, 20, 0.72) 100%);
}

.page-about .about-wide img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.82) contrast(1.06);
}

/* ---------- 版本年表 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 6px 0 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 22px;
  bottom: 24px;
  width: 1px;
  background: linear-gradient(180deg, var(--whistle) 0%, var(--whistle) 12%, var(--line) 38%, var(--line) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 34px;
  margin-bottom: 16px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 24px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--whistle);
  box-shadow: 0 0 0 3px var(--ink);
}

.page-about .about-node {
  background: var(--board);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.4);
  transition: border-color 0.22s var(--ease), box-shadow 0.22s var(--ease);
}

.page-about .about-node:hover {
  border-color: var(--whistle);
}

.page-about .about-node[open] {
  border-color: var(--whistle);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.52);
}

.page-about .about-node__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  grid-template-areas:
    "year title chev"
    "year tag chev";
  align-items: center;
  gap: 3px 14px;
  padding: 14px 15px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-node__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-node__summary:focus-visible {
  outline: 2px solid var(--warm);
  outline-offset: 3px;
}

.page-about .about-node__year {
  grid-area: year;
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--whistle);
}

.page-about .about-node__title {
  grid-area: title;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--bone);
}

.page-about .about-node__tag {
  grid-area: tag;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .about-node__chev {
  grid-area: chev;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1;
  color: var(--whistle);
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-node__chev::before {
  content: "+";
}

.page-about .about-node[open] .about-node__chev::before {
  content: "\2212";
}

.page-about .about-node[open] .about-node__chev {
  background: var(--whistle);
  border-color: var(--whistle);
  color: var(--ink);
}

.page-about .about-node__body {
  padding: 14px 15px 16px;
  border-top: 1px solid var(--line);
}

.page-about .about-node__body p {
  margin: 0;
  max-width: 66ch;
  font-size: 14px;
  line-height: 1.66;
  color: var(--bone);
}

/* ---------- 双栏容器 ---------- */
.page-about .about-block__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

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

.page-about .about-side {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--board);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.42);
  overflow: hidden;
}

.page-about .about-side img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.84) contrast(1.05);
}

/* ---------- 团队条形图 ---------- */
.page-about .about-bars {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-bar {
  padding: 14px 0 13px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-bar__meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 9px;
}

.page-about .about-bar__name {
  font-size: 14px;
  color: var(--bone);
}

.page-about .about-bar__stat {
  display: inline-flex;
  align-items: baseline;
  gap: 3px;
}

.page-about .about-bar__num {
  font-family: var(--font-mono);
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--whistle);
}

.page-about .about-bar__unit {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .about-bar__track {
  height: 6px;
  background: var(--layer);
  overflow: hidden;
}

.page-about .about-bar__fill {
  display: block;
  width: 0;
  height: 100%;
  background: var(--whistle);
  transition: width 0.55s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-bar--lead .about-bar__fill {
  width: 46.2%;
}

.page-about .about-bar--mid .about-bar__fill {
  width: 30.8%;
}

.page-about .about-bar--tail .about-bar__fill {
  width: 23.1%;
}

.page-about .about-bar:hover .about-bar__fill,
.page-about .about-bar:focus-within .about-bar__fill {
  background: var(--warm);
}

.page-about .about-bar__note {
  margin: 9px 0 0;
  font-size: 12px;
  line-height: 1.56;
  color: var(--mist);
}

/* ---------- 别名体系 ---------- */
.page-about .about-alias {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-alias__item {
  display: grid;
  gap: 5px;
  padding: 13px 14px;
  background: var(--layer);
  border: 1px solid var(--line);
  border-left: 2px solid var(--whistle);
  box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.35);
}

.page-about .about-alias__k {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--whistle);
}

.page-about .about-alias__v {
  font-size: 13px;
  line-height: 1.55;
  color: var(--bone);
}

/* ---------- 三件事 ---------- */
.page-about .about-pillars {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-pillar {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--board);
  border: 1px solid var(--line);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.42);
}

.page-about .about-pillar::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--whistle) 0%, var(--whistle) 34%, transparent 34%);
}

.page-about .about-pillar__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-pillar__title {
  margin: 10px 0 10px;
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--bone);
}

.page-about .about-pillar__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.66;
  color: var(--mist);
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-partner {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "num label"
    "note note";
  align-items: baseline;
  gap: 2px 12px;
  padding: 16px 16px 18px;
  background: var(--layer);
  border: 1px solid var(--line);
}

.page-about .about-partner__num {
  grid-area: num;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--whistle);
}

.page-about .about-partner__label {
  grid-area: label;
  font-size: 14px;
  color: var(--bone);
}

.page-about .about-partner__note {
  grid-area: note;
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-cta-line {
  margin: 24px 0 0;
  padding: 16px 18px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--bone);
  background: var(--ink);
  border: 1px solid var(--line);
  border-left: 3px solid var(--whistle);
}

.page-about .about-cta-line a {
  color: var(--whistle);
  text-decoration: none;
  border-bottom: 1px solid var(--whistle);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-cta-line a:hover,
.page-about .about-cta-line a:focus-visible {
  color: var(--warm);
  border-color: var(--warm);
}

/* ---------- 延伸入口 ---------- */
.page-about .about-next {
  margin-top: 52px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.page-about .about-next__title {
  margin: 0 0 16px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .about-next__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-next__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 4px 14px;
  padding: 16px 16px 18px;
  background: var(--ink);
  text-decoration: none;
  transition: background-color 0.2s var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: var(--layer);
}

.page-about .about-next__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-next__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--whistle);
}

.page-about .about-next__desc {
  grid-column: 2;
  font-size: 13px;
  line-height: 1.55;
  color: var(--mist);
}

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

  .page-about .about-node__summary {
    padding: 16px 20px;
    gap: 3px 20px;
  }

  .page-about .about-node__body {
    padding: 16px 20px 18px;
  }

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

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

  .page-about .about-next__link {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
    padding: 20px 18px 22px;
  }

  .page-about .about-next__desc {
    grid-column: 1;
  }
}

@media (min-width: 900px) {
  .page-about {
    padding-bottom: 104px;
  }

  .page-about .about-hero {
    padding: 52px 0 56px;
  }

  .page-about .about-hero__lead {
    font-size: 16px;
  }

  .page-about .about-block {
    padding-top: 68px;
  }

  .page-about .about-block__head {
    margin-bottom: 28px;
  }

  .page-about .about-block__grid {
    grid-template-columns: minmax(0, 1.28fr) minmax(0, 0.92fr);
    align-items: start;
    gap: 44px;
  }

  .page-about .about-block__grid--flip {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.28fr);
  }

  .page-about .about-block__grid--flip .about-side {
    order: -1;
  }

  .page-about .about-pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-timeline__item {
    padding-left: 44px;
    margin-bottom: 18px;
  }

  .page-about .about-timeline__item::before {
    left: 4px;
    top: 26px;
  }

  .page-about .about-wide {
    margin-bottom: 38px;
  }

  .page-about .about-side {
    position: sticky;
    top: 84px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-bar__fill,
  .page-about .about-next__link,
  .page-about .crumbs__item a,
  .page-about .about-cta-line a {
    transition: none;
  }
}
<<<END>>>