.page-about {
  --about-rail-w: 0px;
  --about-rail-gap: 0px;
  background: var(--salt-white);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  overflow-wrap: break-word;
}

.page-about .breadcrumb {
  margin-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .about-lede {
  background-color: var(--salt-white);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(169, 184, 189, 0.26) 0 1px,
    transparent 1px 88px
  );
  border-bottom: 1px solid var(--grid);
}

.page-about .about-lede__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 44px);
  padding-top: clamp(30px, 5.5vw, 68px);
  padding-bottom: clamp(30px, 4.5vw, 54px);
}

.page-about .about-h1 {
  margin: 14px 0 0;
  font-size: clamp(28px, 5.8vw, 52px);
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--lake-deep);
}

.page-about .about-lead {
  margin: 20px 0 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-facts {
  margin: 0;
  border-top: 3px solid var(--lake-deep);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 18px;
}

.page-about .about-fact {
  padding: 13px 0 11px;
  border-bottom: 1px solid var(--grid);
  min-width: 0;
}

.page-about .about-fact dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.4;
  color: var(--muted);
}

.page-about .about-fact dd {
  margin: 6px 0 0;
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.2vw, 28px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ochre);
  margin-right: 4px;
}

/* ---------- 沿革区块 ---------- */
.page-about .about-flow-section {
  padding-top: clamp(36px, 6vw, 72px);
}

.page-about .about-h2 {
  margin: 0 0 12px;
  font-size: clamp(23px, 3.4vw, 34px);
  line-height: 1.28;
  font-weight: 800;
  letter-spacing: -0.012em;
  color: var(--lake-deep);
}

.page-about .about-flow-head {
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-flow-intro {
  margin: 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  padding-bottom: clamp(16px, 3vw, 28px);
}

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

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

/* ---------- 节点 ---------- */
.page-about .about-node {
  padding-bottom: clamp(34px, 5.5vw, 60px);
  scroll-margin-top: 92px;
}

.page-about .about-node:not(:first-child) {
  border-top: 1px solid var(--grid);
  padding-top: clamp(26px, 4vw, 44px);
}

.page-about .about-node__tag {
  display: inline-block;
  margin: 0 0 10px;
  padding-bottom: 3px;
  border-bottom: 2px solid var(--flag);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ochre);
}

.page-about .about-node__title {
  margin: 0 0 16px;
  font-size: clamp(20px, 2.7vw, 27px);
  line-height: 1.36;
  font-weight: 700;
  color: var(--lake-deep);
  letter-spacing: -0.008em;
}

.page-about .about-node__text p {
  margin: 0 0 14px;
  max-width: 66ch;
  line-height: 1.82;
}

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

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 20px;
  border: 1px solid var(--grid);
  background: var(--salt-blue);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.03);
}

.page-about .about-figure figcaption {
  padding: 9px 13px;
  border-top: 1px solid var(--grid);
  background: var(--panel);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 改版节点列表 ---------- */
.page-about .about-milestones {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--grid);
}

.page-about .about-milestones > li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--grid);
}

.page-about .about-milestones__year {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ochre);
}

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

.page-about .about-milestones__title {
  display: block;
  margin-bottom: 5px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-milestones__desc {
  display: block;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 费用透明机制 ---------- */
.page-about .about-fees {
  margin-top: 6px;
  padding: clamp(20px, 3.6vw, 34px) clamp(16px, 3vw, 30px);
  background-color: var(--salt-blue);
  background-image: repeating-linear-gradient(
      0deg,
      rgba(198, 226, 234, 0.95) 0 1px,
      transparent 1px 28px
    ),
    repeating-linear-gradient(
      90deg,
      rgba(198, 226, 234, 0.95) 0 1px,
      transparent 1px 28px
    );
  border: 1px solid var(--salt-blue-line);
  border-left: 3px solid var(--lake-deep);
}

.page-about .about-fees__inner {
  max-width: 58ch;
}

.page-about .about-fees__inner p {
  margin: 0 0 16px;
  line-height: 1.82;
}

.page-about .about-fees__grid {
  margin: 0 0 16px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--salt-blue-line);
  border: 1px solid var(--salt-blue-line);
}

.page-about .about-fees__cell {
  background: var(--panel);
  padding: 12px 14px;
  min-width: 0;
}

.page-about .about-fees__cell dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--lake-deep);
  font-weight: 700;
}

.page-about .about-fees__cell dd {
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.68;
  color: var(--ink);
}

.page-about .about-fees__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-rhythm {
  margin: 0;
  border-top: 1px solid var(--grid);
}

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

.page-about .about-rhythm__when {
  justify-self: start;
  padding: 2px 9px;
  background: var(--flag);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .about-rhythm__what {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

/* ---------- 结尾导流 ---------- */
.page-about .about-next {
  padding-bottom: clamp(40px, 7vw, 80px);
}

.page-about .about-next__head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 18px;
  border-top: 3px solid var(--lake-deep);
  padding-top: clamp(20px, 3.6vw, 34px);
}

.page-about .about-next__lead {
  margin: 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 22px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .about-next__card {
  display: block;
  padding: 18px 16px 20px;
  background: var(--panel);
  text-decoration: none;
  color: var(--ink);
  transition: background-color 0.18s var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  background: var(--salt-blue);
}

.page-about .about-next__idx {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--lake);
}

.page-about .about-next__name {
  display: block;
  margin-bottom: 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--lake-deep);
}

.page-about .about-next__desc {
  display: block;
  font-size: 14px;
  line-height: 1.68;
  color: var(--muted);
}

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

  .page-about .about-milestones > li {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 0 22px;
    align-items: start;
  }

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

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about {
    --about-rail-w: 150px;
    --about-rail-gap: clamp(26px, 3.4vw, 52px);
  }

  .page-about .about-lede__grid {
    grid-template-columns: minmax(0, 1.85fr) minmax(250px, 1fr);
    gap: clamp(36px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-flow {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 0 var(--about-rail-gap);
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 86px;
    align-self: start;
  }

  .page-about .about-rail__list {
    list-style: none;
    margin: 0;
    padding: 0;
    border-left: 1px solid var(--grid);
  }

  .page-about .about-rail__link {
    display: flex;
    align-items: baseline;
    gap: 10px;
    margin-left: -1px;
    padding: 9px 0 9px 13px;
    border-left: 2px solid transparent;
    text-decoration: none;
    color: var(--muted);
    font-size: 13px;
    letter-spacing: 0.05em;
    line-height: 1.45;
    transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    color: var(--lake-deep);
    border-left-color: var(--lake);
  }

  .page-about .about-rail__link[aria-current="true"] {
    color: var(--lake-deep);
    border-left-color: var(--ochre);
    font-weight: 700;
  }

  .page-about .about-rail__num {
    font-family: var(--font-mono);
    font-size: 11.5px;
    letter-spacing: 0.02em;
    color: var(--grid);
    flex: none;
  }

  .page-about .about-rail__link[aria-current="true"] .about-rail__num {
    color: var(--ochre);
  }

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

  .page-about .about-rail__label em {
    display: block;
    margin-top: 2px;
    font-style: normal;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.06em;
    color: var(--grid);
  }

  .page-about .about-rail__link[aria-current="true"] .about-rail__label em {
    color: var(--lake);
  }

  .page-about .about-flow__body {
    border-left: 1px solid var(--grid);
    padding-left: clamp(24px, 3vw, 44px);
  }

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

  .page-about .about-node:first-child {
    padding-top: 2px;
  }

  .page-about .about-next__head {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
    gap: 32px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-next__card {
    transition: none;
  }
}
<<<END>>>