.page-about .crumbs {
  padding-block: 1.35rem .75rem;
  font-size: .8rem;
}

/* ---------- 历程封面 ---------- */
.page-about .hist-hero {
  position: relative;
  display: grid;
  gap: 1.9rem;
  padding-block: 1.5rem 2.75rem;
}

.page-about .hist-hero::before {
  content: "";
  position: absolute;
  top: -4rem;
  right: -6rem;
  width: 20rem;
  height: 20rem;
  background: radial-gradient(circle, var(--glow-coral), transparent 68%);
  pointer-events: none;
  z-index: 0;
}

.page-about .hist-hero-text {
  position: relative;
  z-index: 1;
}

.page-about .hist-title {
  margin: .7rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.95rem, 7.4vw, 3.5rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-about .hist-title em {
  font-style: normal;
  color: var(--coral);
  background: linear-gradient(transparent 66%, rgba(255, 122, 89, .2) 0);
}

.page-about .hist-lead {
  margin: 1.15rem 0 1.6rem;
  max-width: 35em;
  font-size: .98rem;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .hist-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .6rem .85rem;
}

.page-about .hist-stamp {
  font-size: .74rem;
  letter-spacing: .16em;
  color: var(--mist);
}

.page-about .hist-figure {
  position: relative;
  z-index: 1;
  margin: 0;
  padding: .45rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
  box-shadow: var(--shadow-soft);
}

.page-about .hist-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: 1px;
}

.page-about .hist-figcap {
  display: block;
  padding-top: .55rem;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .16em;
  color: var(--mist);
  text-transform: uppercase;
}

/* ---------- 章节吸顶导航 ---------- */
.page-about .hist-jump {
  position: sticky;
  top: .5rem;
  z-index: 30;
  margin-block: .25rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(13, 36, 54, .94);
  box-shadow: 0 10px 26px rgba(0, 0, 0, .35);
}

@supports (backdrop-filter: blur(8px)) {
  .page-about .hist-jump {
    backdrop-filter: blur(10px);
    background: rgba(13, 36, 54, .8);
  }
}

.page-about .hist-jump-list {
  display: flex;
  gap: .1rem;
  margin: 0;
  padding: .3rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.page-about .hist-jump-list::-webkit-scrollbar {
  display: none;
}

.page-about .hist-jump-link {
  display: inline-flex;
  align-items: baseline;
  gap: .42rem;
  padding: .5rem .72rem;
  font-size: .8rem;
  white-space: nowrap;
  color: var(--mist);
  text-decoration: none;
  border-radius: 2px;
  transition: color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .hist-jump-link .num-mono {
  font-size: .68rem;
  letter-spacing: .1em;
  color: rgba(69, 242, 200, .72);
}

.page-about .hist-jump-link:hover,
.page-about .hist-jump-link:focus-visible {
  color: var(--paper);
  background: rgba(255, 122, 89, .14);
}

.page-about .hist-jump-link:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: -2px;
}

/* ---------- 章节框架 ---------- */
.page-about .hist-section {
  padding-block: 2.25rem 2.75rem;
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: 5rem;
}

.page-about .hist-section::before {
  content: attr(data-chapter);
  display: block;
  margin-bottom: .5rem;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 8vw, 2.75rem);
  font-weight: 700;
  line-height: .95;
  letter-spacing: -.04em;
  color: rgba(69, 242, 200, .26);
}

.page-about .hist-section-head {
  display: grid;
  gap: .65rem;
  margin-bottom: 1.75rem;
}

.page-about .hist-h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 4.8vw, 2rem);
  font-weight: 800;
  line-height: 1.22;
  color: var(--paper);
}

.page-about .hist-sub {
  margin: 0;
  max-width: 40em;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .hist-section-body {
  min-width: 0;
}

/* ---------- 版本时间轴 ---------- */
.page-about .ver-list {
  position: relative;
  display: grid;
  gap: .55rem;
  margin: 0;
  padding: 0 0 0 2rem;
  list-style: none;
}

.page-about .ver-list::before {
  content: "";
  position: absolute;
  left: .3rem;
  top: 1.2rem;
  bottom: 1.2rem;
  width: 1px;
  background: linear-gradient(180deg, rgba(69, 242, 200, .45), var(--line-soft));
}

.page-about .ver-item {
  position: relative;
  min-width: 0;
}

.page-about .ver-item::before {
  content: "";
  position: absolute;
  left: -1.95rem;
  top: 1.1rem;
  width: .5rem;
  height: .5rem;
  border-radius: 50%;
  background: var(--ink-800);
  box-shadow: 0 0 0 1px rgba(168, 184, 196, .45);
  transition: background-color .22s var(--ease), box-shadow .22s var(--ease);
  z-index: 1;
}

.page-about .ver-item:has(.ver[open])::before {
  background: var(--mint);
  box-shadow: 0 0 0 1px rgba(69, 242, 200, .6), 0 0 12px rgba(69, 242, 200, .5);
}

.page-about .ver {
  border: 1px solid var(--line-soft);
  border-radius: 2px;
  background: linear-gradient(180deg, rgba(23, 56, 76, .48), rgba(13, 36, 54, .32));
  transition: border-color .22s var(--ease), background-color .22s var(--ease);
}

.page-about .ver:hover {
  border-color: rgba(168, 184, 196, .4);
}

.page-about .ver[open] {
  border-color: rgba(69, 242, 200, .32);
  background: linear-gradient(180deg, rgba(23, 56, 76, .82), rgba(13, 36, 54, .52));
}

.page-about .ver-summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: .5rem 1rem;
  padding: .85rem 1rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ver-summary:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: -2px;
}

.page-about .ver-marker {
  display: grid;
  gap: .08rem;
  min-width: 3rem;
}

.page-about .ver-code {
  font-size: .92rem;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--mint);
}

.page-about .ver-year {
  font-size: .66rem;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .ver-name {
  font-size: .95rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .ver-arrow {
  position: relative;
  width: .85rem;
  height: .85rem;
  flex: none;
}

.page-about .ver-arrow::before,
.page-about .ver-arrow::after {
  content: "";
  position: absolute;
  background: var(--mist);
  transition: transform .22s var(--ease), background-color .22s var(--ease);
}

.page-about .ver-arrow::before {
  top: 50%;
  left: 0;
  width: 100%;
  height: 1px;
  transform: translateY(-50%);
}

.page-about .ver-arrow::after {
  left: 50%;
  top: 0;
  height: 100%;
  width: 1px;
  transform: translateX(-50%);
}

.page-about .ver[open] .ver-arrow::after {
  transform: translateX(-50%) scaleY(0);
}

.page-about .ver[open] .ver-arrow::before {
  background: var(--mint);
}

.page-about .ver-body {
  padding: 0 1rem 1.05rem;
  border-top: 1px solid var(--line-soft);
  margin-top: -.15rem;
  padding-top: .85rem;
}

.page-about .ver-body p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .ver-body a {
  color: var(--mint);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 差异对照 ---------- */
.page-about .diff-figure {
  margin: 0 0 1.5rem;
  padding: .4rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
}

.page-about .diff-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 1px;
}

.page-about .diff-figcap {
  display: block;
  padding: .5rem .35rem .2rem;
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .14em;
  color: var(--mist);
}

.page-about .diff-list {
  display: grid;
  gap: .75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .diff-item {
  padding: .95rem 1rem;
  border: 1px solid var(--line-soft);
  border-left-width: 3px;
  border-left-style: solid;
  border-radius: 2px;
  background: rgba(13, 36, 54, .42);
}

.page-about .diff-item--add {
  border-left-color: var(--mint);
}

.page-about .diff-item--adjust {
  border-left-color: var(--amber);
}

.page-about .diff-item--keep {
  border-left-color: var(--mist);
}

.page-about .diff-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem .7rem;
  margin-bottom: .8rem;
}

.page-about .diff-tag {
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .16em;
  padding: .18rem .45rem;
  border: 1px solid currentColor;
  border-radius: 1px;
}

.page-about .diff-tag--add {
  color: var(--mint);
}

.page-about .diff-tag--adjust {
  color: var(--amber);
}

.page-about .diff-tag--keep {
  color: var(--mist);
}

.page-about .diff-name {
  margin: 0;
  font-size: .95rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .diff-pair {
  display: grid;
  gap: .55rem;
}

.page-about .diff-cell {
  padding: .7rem .8rem;
  border: 1px solid var(--line-soft);
  border-radius: 2px;
}

.page-about .diff-cell--old {
  background: rgba(7, 24, 38, .55);
}

.page-about .diff-cell--new {
  background: rgba(69, 242, 200, .05);
  border-color: rgba(69, 242, 200, .2);
}

.page-about .diff-label {
  display: block;
  font-size: .64rem;
  letter-spacing: .16em;
  color: var(--mist);
}

.page-about .diff-cell--new .diff-label {
  color: var(--mint);
}

.page-about .diff-cell p {
  margin: .28rem 0 0;
  font-size: .86rem;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 每月怎么维护 ---------- */
.page-about .work-grid {
  display: grid;
  gap: 1.5rem;
}

.page-about .work-figure {
  margin: 0;
  padding: .4rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
}

.page-about .work-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  border-radius: 1px;
}

.page-about .work-figcap {
  display: block;
  padding: .5rem .35rem .2rem;
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .14em;
  color: var(--mist);
}

.page-about .work-roles {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .work-role {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .15rem .85rem;
  padding: .85rem 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .work-role:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .work-count {
  grid-row: 1 / span 2;
  min-width: 2.4ch;
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--mint);
}

.page-about .work-name {
  margin: 0;
  font-size: .94rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .work-desc {
  margin: 0;
  font-size: .84rem;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .work-checks {
  margin-top: 1.6rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line-soft);
}

.page-about .work-checks-title {
  margin: 0 0 .7rem;
  font-size: .68rem;
  letter-spacing: .18em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .work-checks-list {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .work-checks-list li {
  padding: .32rem .7rem;
  font-size: .8rem;
  color: var(--paper);
  border: 1px solid rgba(246, 196, 83, .4);
  border-radius: 1px;
  background: rgba(246, 196, 83, .07);
}

/* ---------- 数字与底子 ---------- */
.page-about .stat-list {
  border-top: 1px solid var(--line-soft);
}

.page-about .stat {
  display: grid;
  gap: .18rem;
  padding: .85rem 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .stat-label {
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .stat-value {
  font-size: .95rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .stat-num {
  font-size: 1.28rem;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--coral);
}

.page-about .stat-note {
  font-size: .84rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 下一步 ---------- */
.page-about .hist-section--next {
  border-top-color: rgba(255, 122, 89, .28);
}

.page-about .hist-section--next::before {
  color: rgba(255, 122, 89, .3);
}

.page-about .next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
}

.page-about .next-note {
  margin: 1.15rem 0 0;
  font-size: .86rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .next-note a {
  color: var(--mint);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .next-note a:hover {
  color: var(--paper);
}

/* ---------- 中屏 ---------- */
@media (min-width: 620px) {
  .page-about .diff-pair {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: .6rem;
  }

  .page-about .stat {
    grid-template-columns: 7.5rem minmax(0, 1fr);
    align-items: baseline;
    gap: .15rem 1.25rem;
  }

  .page-about .stat-label {
    grid-row: 1 / span 2;
    padding-top: .1rem;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .hist-hero {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    align-items: center;
    gap: 3.5rem;
    padding-block: 2.5rem 4rem;
  }

  .page-about .hist-lead {
    font-size: 1.02rem;
  }

  .page-about .hist-jump {
    margin-block: .5rem 2rem;
  }

  .page-about .hist-jump-link {
    font-size: .84rem;
    padding: .55rem .9rem;
  }

  .page-about .hist-section {
    display: grid;
    grid-template-columns: 7.5rem minmax(0, 1fr);
    column-gap: 3rem;
    padding-block: 3.75rem;
  }

  .page-about .hist-section::before {
    grid-column: 1;
    grid-row: 1 / span 2;
    position: sticky;
    top: 6rem;
    align-self: start;
    margin-bottom: 0;
    font-size: 3.4rem;
  }

  .page-about .hist-section-head,
  .page-about .hist-section-body {
    grid-column: 2;
  }

  .page-about .hist-section-head {
    margin-bottom: 1.9rem;
  }

  .page-about .diff-figure {
    max-width: 40rem;
  }

  .page-about .work-grid {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1fr);
    gap: 2.5rem;
    align-items: start;
  }

  .page-about .stat {
    grid-template-columns: 8rem 11rem minmax(0, 1fr);
    gap: 1.5rem;
    align-items: baseline;
  }

  .page-about .stat-label {
    grid-row: auto;
    padding-top: 0;
  }

  .page-about .ver-summary {
    padding: .95rem 1.15rem;
    gap: .5rem 1.35rem;
  }

  .page-about .ver-body {
    padding-left: 1.15rem;
    padding-right: 1.15rem;
  }
}

@media (min-width: 1100px) {
  .page-about .hist-section {
    grid-template-columns: 8.5rem minmax(0, 1fr);
    column-gap: 3.5rem;
  }
}
<<<END>>>