.page-about {
  --about-wide: 1180px;
  --about-gutter: 1rem;
  --about-panel-pad: 1.35rem;
  background: var(--ink-900);
  color: var(--bone);
  font-family: var(--font-display);
  padding-block: 1rem 4rem;
  overflow-x: clip;
}

.page-about .about-shell {
  width: min(100% - (var(--about-gutter) * 2), var(--about-wide));
  margin-inline: auto;
}

.page-about a {
  color: var(--lime);
  text-decoration: none;
}

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
  border-radius: 4px;
}

.page-about [id] {
  scroll-margin-top: 5rem;
}

/* ---------- 首屏：章节预览 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 2rem;
  padding-block: 1.5rem 2.75rem;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero-title {
  margin: 0.9rem 0 1.25rem;
  font-size: clamp(2.1rem, 8vw, 4.3rem);
  font-weight: 300;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--bone);
}

.page-about .about-hero-lede {
  max-width: 36ch;
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(242, 245, 233, 0.76);
}

.page-about .data-label {
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lime);
  margin: 0 0 0.9rem;
}

.page-about .about-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.15rem;
}

.page-about .about-index a {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--bone);
  font-size: 0.92rem;
  transition: color 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.page-about .about-index a:hover {
  color: var(--lime);
  padding-left: 0.3rem;
}

.page-about .idx {
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--lime);
  min-width: 1.6rem;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  padding-block: 3rem;
  border-top: 1px solid var(--line);
}

.page-about .about-sec:first-of-type {
  border-top: 0;
}

.page-about .sec-head {
  margin-bottom: 1.75rem;
}

.page-about .section-title {
  margin: 0;
  font-size: clamp(1.55rem, 5vw, 2.5rem);
  font-weight: 600;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.page-about .prose p {
  margin: 0 0 1.1rem;
  font-size: 0.96rem;
  line-height: 1.82;
  color: rgba(242, 245, 233, 0.8);
}

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

/* ---------- 起点与时间轴 ---------- */
.page-about .origin-grid {
  display: grid;
  gap: 1.75rem;
  margin-bottom: 2.25rem;
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-800);
  box-shadow: var(--shadow);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure--wide {
  margin-top: 1.75rem;
  border-radius: var(--radius);
}

.page-about .year-axis {
  list-style: none;
  margin: 0;
  padding: 0 0 0.75rem;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(190px, 82%);
  gap: 1rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .year-item {
  position: relative;
  scroll-snap-align: start;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
}

.page-about .year-item::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 3px rgba(200, 255, 61, 0.16);
}

.page-about .year-num {
  display: block;
  font-family: var(--font-data);
  font-size: 1.3rem;
  letter-spacing: 0.02em;
  color: var(--lime);
}

.page-about .year-text {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--sage);
}

/* ---------- 归档方法 ---------- */
.page-about .axis-grid {
  display: grid;
  gap: 1.75rem;
}

.page-about .axis-panel {
  padding: var(--about-panel-pad);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--ink-700), var(--ink-800) 72%);
  box-shadow: var(--shadow);
}

.page-about .axis-figures {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .axis-figures li {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.8rem 0.9rem;
  background: var(--ink-800);
}

.page-about .fig-num {
  font-family: var(--font-data);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--lime);
  min-width: 4.4rem;
}

.page-about .fig-key {
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--sage);
}

.page-about .axis-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.15rem;
}

/* ---------- 编辑小组 ---------- */
.page-about .prose + .crew-grid {
  margin-top: 1.75rem;
}

.page-about .crew-grid {
  display: grid;
  gap: 1rem;
}

.page-about .crew-card {
  padding: 1.15rem 1.15rem 1.3rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--ink-800);
}

.page-about .crew-num {
  margin: 0 0 0.7rem;
  font-family: var(--font-data);
  font-size: 1.6rem;
  line-height: 1;
  color: var(--jade);
  letter-spacing: 0.04em;
}

.page-about .crew-title {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--bone);
}

.page-about .crew-text {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.72;
  color: var(--sage);
}

.page-about .rhythm {
  margin-top: 1.5rem;
  border-top: 1px solid var(--line);
}

.page-about .rhythm-item {
  display: grid;
  gap: 0.3rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .rhythm-key {
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .rhythm-val {
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(242, 245, 233, 0.78);
}

/* ---------- 珠宝色面板 ---------- */
.page-about .about-panel {
  padding: var(--about-panel-pad);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.page-about .about-panel--wine {
  background: linear-gradient(150deg, var(--wine), var(--ink-800) 88%);
}

.page-about .about-panel--indigo {
  background: linear-gradient(150deg, var(--indigo), var(--ink-800) 88%);
}

.page-about .panel-lede {
  margin: 0 0 1.5rem;
  max-width: 42ch;
  font-size: 0.94rem;
  line-height: 1.85;
  color: rgba(242, 245, 233, 0.85);
}

.page-about .stat-grid {
  list-style: none;
  margin: 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .stat {
  padding: 1.1rem 0.9rem;
  background: rgba(7, 17, 14, 0.72);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(1.4rem, 5.6vw, 2rem);
  font-weight: 600;
  line-height: 1.05;
  color: var(--lime);
}

.page-about .stat-label {
  display: block;
  margin-top: 0.55rem;
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--sage);
}

/* ---------- 合作生态 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: 1.5rem;
}

.page-about .partner-block {
  padding-bottom: 1.1rem;
  border-bottom: 1px solid rgba(242, 245, 233, 0.16);
}

.page-about .partner-block:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .partner-num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(1.9rem, 7vw, 2.8rem);
  font-weight: 600;
  line-height: 1;
  color: var(--bone);
}

.page-about .partner-sub {
  font-size: 0.55em;
  color: var(--sage);
}

.page-about .partner-title {
  margin: 0.55rem 0 0.45rem;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--lime);
}

.page-about .partner-text {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.75;
  color: rgba(242, 245, 233, 0.78);
}

/* ---------- 版本路线 ---------- */
.page-about .ver-track {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .ver-card {
  position: relative;
  padding: 1.15rem 1.15rem 1.3rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--ink-800);
}

.page-about .ver-card--current {
  border-color: var(--lime);
  background: linear-gradient(158deg, var(--ink-700), var(--ink-800) 82%);
  box-shadow: 0 0 0 1px rgba(200, 255, 61, 0.22) inset, var(--shadow);
}

.page-about .ver-id {
  display: block;
  font-family: var(--font-data);
  font-size: 1.05rem;
  letter-spacing: 0.05em;
  color: var(--bone);
}

.page-about .ver-card--current .ver-id {
  color: var(--lime);
}

.page-about .ver-tag {
  display: inline-block;
  margin-bottom: 0.6rem;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  background: var(--lime);
  color: var(--ink-950);
  font-family: var(--font-data);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
}

.page-about .ver-card p {
  margin: 0.6rem 0 0;
  font-size: 0.84rem;
  line-height: 1.72;
  color: var(--sage);
}

.page-about .ver-track + .about-figure {
  margin-top: 1.75rem;
}

/* ---------- 下一步 ---------- */
.page-about .next-step {
  margin-top: 2rem;
  padding: var(--about-panel-pad);
  border: 1px solid var(--line);
  border-left: 3px solid var(--lime);
  border-radius: var(--radius-sm);
  background: var(--ink-800);
  display: grid;
  gap: 1.25rem;
}

.page-about .next-step-title {
  margin: 0 0 0.6rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--bone);
}

.page-about .next-step-text p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(242, 245, 233, 0.8);
}

.page-about .next-step-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.page-about .next-step-actions .btn {
  text-decoration: none;
}

.page-about .about-footnote {
  margin: 1.75rem 0 0;
  font-size: 0.84rem;
  line-height: 1.75;
  color: var(--sage);
}

.page-about .about-footnote a {
  border-bottom: 1px solid rgba(200, 255, 61, 0.4);
}

/* ---------- 响应式 ---------- */
@media (min-width: 680px) {
  .page-about {
    --about-gutter: 1.75rem;
    --about-panel-pad: 1.9rem;
  }

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

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

  .page-about .stat-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .rhythm-item {
    grid-template-columns: 9rem minmax(0, 1fr);
    gap: 1rem;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-gutter: 2.5rem;
    --about-panel-pad: 2.5rem;
    padding-block: 1.5rem 5.5rem;
  }

  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    gap: 3.5rem;
    align-items: end;
    padding-block: 2.5rem 4.5rem;
  }

  .page-about .about-hero-lede {
    font-size: 1.05rem;
  }

  .page-about .about-sec {
    padding-block: 4.5rem;
  }

  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 3rem;
    align-items: center;
  }

  .page-about .year-axis {
    grid-auto-flow: row;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    grid-auto-columns: auto;
    overflow: visible;
    gap: 1.25rem;
  }

  .page-about .axis-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 2.5rem;
  }

  .page-about .partner-block {
    padding-bottom: 0;
    border-bottom: 0;
  }

  .page-about .ver-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
  }

  .page-about .next-step {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 2rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index a,
  .page-about .year-axis {
    transition: none;
    scroll-behavior: auto;
  }
}
<<<END>>>