.page-about {
  --about-rail-w: 236px;
  --about-rail-gap: 44px;
  display: block;
  padding-bottom: 76px;
  background: var(--ink);
  color: var(--paper);
}

.page-about .breadcrumbs {
  padding-top: 22px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 26px 0 44px;
  border-bottom: 2px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(118deg, rgba(56, 242, 208, 0.07) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(28deg, rgba(30, 58, 82, 0.55) 0 1px, transparent 1px 96px);
}

.page-about .about-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 5.6vw, 3.7rem);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: 1.02rem;
  line-height: 1.82;
  color: var(--muted);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: 30px 0 0;
  padding: 2px;
  list-style: none;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .about-stats li {
  display: grid;
  gap: 2px;
  min-width: 0;
  padding: 14px 16px 16px;
  background: var(--ink-deep);
}

.page-about .about-stats strong {
  font-family: var(--font-mono);
  font-size: clamp(1.45rem, 3.2vw, 1.95rem);
  font-weight: 600;
  line-height: 1.1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stats li:first-child strong {
  color: var(--cyan);
}

.page-about .about-stats span {
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--muted-dim);
}

/* ---------- 跨页骨架 ---------- */
.page-about .about-spread {
  padding-top: 44px;
}

@media (min-width: 1024px) {
  .page-about .about-spread {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    column-gap: var(--about-rail-gap);
    align-items: start;
  }
}

/* ---------- 左侧版本轴 ---------- */
.page-about .about-rail {
  display: none;
}

@media (min-width: 1024px) {
  .page-about .about-rail {
    display: block;
    align-self: start;
    position: sticky;
    top: 104px;
    padding: 4px 0 20px;
  }
}

.page-about .about-rail__title {
  margin: 0 0 18px;
  padding-left: 30px;
  color: var(--cyan);
}

.page-about .about-rail__list {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rail__list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--orange));
  opacity: 0.5;
}

.page-about .about-rail__item {
  position: relative;
}

.page-about .about-rail__item + .about-rail__item {
  margin-top: 24px;
}

.page-about .about-rail__link {
  position: relative;
  display: block;
  padding-left: 30px;
  text-decoration: none;
  color: var(--muted);
  transition: color 0.2s var(--ease);
}

.page-about .about-rail__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 16px;
  height: 16px;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  background: var(--ink);
  transition: background-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .about-rail__link--current::before {
  border-color: var(--orange);
  background: var(--orange);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--paper);
}

.page-about .about-rail__link:hover::before,
.page-about .about-rail__link:focus-visible::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(56, 242, 208, 0.16);
}

.page-about .about-rail__link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.page-about .about-rail__year {
  display: block;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--muted-dim);
}

.page-about .about-rail__link--current .about-rail__year {
  color: var(--orange);
}

.page-about .about-rail__label {
  display: block;
  margin-top: 3px;
  font-size: 0.9rem;
  line-height: 1.45;
}

/* ---------- 右侧流式正文 ---------- */
.page-about .about-stream {
  display: grid;
  gap: 56px;
  min-width: 0;
}

.page-about .about-section {
  min-width: 0;
  scroll-margin-top: 110px;
}

.page-about .about-section__index {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-section h2 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 3.4vw, 2.1rem);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-section h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.04rem;
  font-weight: 700;
  line-height: 1.42;
  color: var(--paper);
}

.page-about .about-section p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 0.97rem;
  line-height: 1.82;
  color: var(--muted);
}

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

/* ---------- 纸感引用块 ---------- */
.page-about .about-quote {
  margin: 28px 0 0;
  padding: 24px 22px;
  background: var(--paper);
  color: var(--ink-deep);
  border: 2px solid var(--ink-deep);
  box-shadow: 8px 8px 0 0 var(--orange);
}

.page-about .about-quote p {
  margin: 0;
  max-width: none;
  font-size: 1.02rem;
  font-weight: 600;
  line-height: 1.72;
  color: var(--ink-deep);
}

.page-about .about-quote__source {
  display: block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--ink-panel);
  opacity: 0.72;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 26px 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 2px solid var(--line);
  background: var(--ink-deep);
  box-shadow: 8px 8px 0 0 rgba(30, 58, 82, 0.85);
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--muted-dim);
}

/* ---------- 数据条 ---------- */
.page-about .about-bars {
  display: grid;
  gap: 10px;
  margin: 26px 0;
  padding: 0;
  list-style: none;
}

.page-about .about-bar {
  display: grid;
  grid-template-columns: 66px minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 6px;
  align-items: baseline;
  padding: 14px 16px 16px;
  border: 2px solid var(--line);
  border-left: 4px solid var(--cyan);
  background: var(--ink-panel);
}

.page-about .about-bar:nth-child(2) {
  border-left-color: var(--orange);
}

.page-about .about-bar:nth-child(3) {
  border-left-color: var(--green);
}

.page-about .about-bar__num {
  font-size: clamp(1.4rem, 2.6vw, 1.75rem);
  font-weight: 600;
  line-height: 1.1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-bar__label {
  font-size: 0.94rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-bar__note {
  grid-column: 1 / -1;
  font-size: 0.84rem;
  line-height: 1.62;
  color: var(--muted-dim);
}

/* ---------- 版本节点 ---------- */
.page-about .about-mile {
  display: grid;
  gap: 8px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-mile__item {
  padding: 14px 0 14px 18px;
  border-left: 3px solid var(--line);
  scroll-margin-top: 110px;
  transition: border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about .about-mile__item:target {
  border-left-color: var(--orange);
  background: linear-gradient(90deg, rgba(255, 106, 61, 0.12), transparent 70%);
}

.page-about .about-mile__year {
  display: inline-block;
  margin-bottom: 6px;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-mile__item p {
  margin: 0;
  max-width: 58ch;
  font-size: 0.92rem;
  line-height: 1.72;
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cadence__item {
  padding: 16px 16px 18px;
  border: 2px solid var(--line);
  border-top: 3px solid var(--cyan);
  background: var(--ink-deep);
}

.page-about .about-cadence__when {
  display: block;
  margin-bottom: 8px;
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-cadence__item p {
  margin: 0;
  max-width: 40ch;
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ---------- 行动入口 ---------- */
.page-about .about-next__grid {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-next__card {
  display: grid;
  gap: 6px;
  padding: 18px 18px 20px;
  border: 2px solid var(--line);
  background: var(--ink-deep);
  color: var(--muted);
  text-decoration: none;
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease),
    background-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .about-next__card strong {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-next__no {
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .about-next__desc {
  font-size: 0.88rem;
  line-height: 1.68;
  color: var(--muted);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--cyan);
  background: var(--ink-panel);
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 0 var(--cyan);
  outline: none;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 680px) {
  .page-about .about-cadence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 720px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-about .about-stream {
    gap: 64px;
  }

  .page-about .about-quote {
    padding: 28px 26px;
  }
}

@keyframes about-rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-about .about-bar {
  animation: about-rise 0.5s var(--ease) both;
}

.page-about .about-bar:nth-child(2) {
  animation-delay: 0.06s;
}

.page-about .about-bar:nth-child(3) {
  animation-delay: 0.12s;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-bar {
    animation: none;
  }

  .page-about .about-rail__link,
  .page-about .about-mile__item,
  .page-about .about-next__card {
    transition: none;
  }

  .page-about .about-next__card:hover,
  .page-about .about-next__card:focus-visible {
    transform: none;
  }
}
<<<END>>>