.page-about {
  --about-axis: 56px;
  background: var(--green-900);
  color: var(--paper-100);
}

.page-about .about-side-note {
  position: absolute;
  top: 96px;
  right: 8px;
  color: var(--gold);
}

/* ---------- 首屏 ---------- */
.page-about .about-head {
  position: relative;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-head__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin: 22px 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold);
  text-transform: uppercase;
}

.page-about .about-head__meta span + span::before {
  content: "／";
  margin-right: 16px;
  color: var(--gold-deep);
}

.page-about .about-title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 8vw, 4.2rem);
  line-height: 1.04;
  letter-spacing: 0.02em;
  color: var(--paper-100);
  max-width: 20ch;
}

.page-about .about-lede {
  max-width: 60ch;
  margin: 0;
  color: var(--mist);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-lede--tight {
  margin-bottom: 28px;
  max-width: 64ch;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 32px;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  background: var(--green-800);
  border: 1px solid var(--green-500);
  border-top: 2px solid var(--gold-deep);
}

.page-about .about-stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 5vw, 2rem);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-stat--accent .about-stat__value {
  color: var(--blue);
}

.page-about .about-stat__label {
  font-size: 12px;
  letter-spacing: 0.04em;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 奶油纸区块内的通用墨色 ---------- */
.page-about .about-ink {
  color: var(--ink-900);
}

.page-about .about-ink .about-h2,
.page-about .about-ink .eyebrow,
.page-about .about-ink .about-facts__num {
  color: var(--ink-900);
}

.page-about .about-ink .eyebrow {
  color: var(--gold-deep);
}

.page-about .about-h2 {
  margin: 8px 0 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.55rem, 5.2vw, 2.6rem);
  line-height: 1.12;
  letter-spacing: 0.02em;
  color: var(--paper-100);
}

/* ---------- 分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 28px;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--green-800);
}

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

.page-about .about-figure__caption {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

.page-about .about-ink .about-figure {
  background: var(--paper-200);
  border-color: rgba(27, 22, 17, 0.25);
}

.page-about .about-ink .about-figure__caption {
  color: var(--ink-900);
  border-top-color: rgba(27, 22, 17, 0.2);
}

/* ---------- 数据点列表 ---------- */
.page-about .about-facts {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-facts li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 0;
  border-top: 1px solid rgba(27, 22, 17, 0.16);
}

.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.15rem;
  color: var(--orange);
  min-width: 4.5ch;
}

.page-about .about-facts__label {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(27, 22, 17, 0.78);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline-section {
  border-bottom: 1px solid var(--line);
}

.page-about .about-section-head {
  margin-bottom: 22px;
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.page-about .about-jump a {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 6px 14px;
  border: 1px solid var(--line-strong);
  color: var(--mist);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  color: var(--green-900);
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-timeline__item {
  display: grid;
  gap: 10px;
  padding: 16px 14px;
  background: var(--green-800);
  border: 1px solid var(--green-500);
  border-left: 2px solid var(--gold-deep);
}

.page-about .about-timeline__node {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .about-timeline__node::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: var(--line-strong);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.4rem;
  letter-spacing: 0.06em;
  line-height: 1.2;
  color: var(--orange);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.12rem;
  letter-spacing: 0.02em;
  color: var(--paper-100);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-timeline__hint {
  margin: 10px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--blue);
}

/* ---------- 轮值 ---------- */
.page-about .about-shift {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-shift li {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(27, 22, 17, 0.82);
  background: var(--paper-200);
  border-left: 2px solid var(--gold);
}

.page-about .about-shift strong {
  display: inline-block;
  min-width: 3.4em;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--ink-900);
}

/* ---------- 数据合作 ---------- */
.page-about .about-data {
  border-bottom: 1px solid var(--line);
}

.page-about .about-flow {
  list-style: none;
  counter-reset: about-step;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-flow li {
  position: relative;
  padding: 14px 16px 14px 56px;
  background: var(--green-700);
  border: 1px solid var(--green-500);
}

.page-about .about-flow li::before {
  counter-increment: about-step;
  content: "0" counter(about-step);
  position: absolute;
  left: 16px;
  top: 15px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .about-flow__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--paper-100);
}

.page-about .about-flow p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-layers {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.page-about .about-layers__item {
  padding: 10px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-align: center;
  color: var(--paper-100);
  border: 1px solid var(--line-strong);
  background: rgba(70, 169, 242, 0.06);
}

/* ---------- 年鉴 ---------- */
.page-about .about-inline-link {
  margin: 22px 0 0;
}

/* ---------- 术语 ---------- */
.page-about .about-glossary {
  border-bottom: 1px solid var(--line);
}

.page-about .about-terms {
  display: grid;
  gap: 12px;
}

.page-about .about-term {
  padding: 18px 16px;
  background: var(--green-800);
  border: 1px solid var(--green-500);
  border-top: 2px solid var(--orange);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-term:hover {
  border-color: var(--orange);
  transform: translateY(-2px);
}

.page-about .about-term__name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  letter-spacing: 0.06em;
  color: var(--paper-100);
}

.page-about .about-term__text {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-term__where {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-about .about-term__where a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(70, 169, 242, 0.5);
}

.page-about .about-term__where a:hover,
.page-about .about-term__where a:focus-visible {
  border-bottom-color: var(--blue);
  color: var(--paper-100);
}

/* ---------- 路径索引 ---------- */
.page-about .about-paths {
  display: grid;
  gap: 0;
  margin-top: 26px;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-paths__link {
  display: grid;
  grid-template-columns: 3.2em 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 16px 4px;
  border-bottom: 1px solid var(--line);
  color: var(--paper-100);
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.page-about .about-paths__link:hover,
.page-about .about-paths__link:focus-visible {
  background: var(--green-500);
  color: var(--paper-100);
}

.page-about .about-paths__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-paths__label {
  font-size: 14px;
  line-height: 1.5;
}

.page-about .about-paths__arrow {
  font-family: var(--font-mono);
  color: var(--blue);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta__inner {
  display: grid;
  gap: 24px;
  padding: 30px 20px;
  background: var(--green-700);
  border: 1px solid var(--green-500);
  border-left: 3px solid var(--orange);
}

.page-about .about-cta__title {
  margin: 8px 0 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 5vw, 2.2rem);
  line-height: 1.12;
  letter-spacing: 0.02em;
  color: var(--paper-100);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: flex-start;
}

.page-about .about-cta__actions .cta {
  flex: 1 1 180px;
  text-align: center;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .about-terms {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

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

  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 900px) {
  .page-about .about-head {
    padding-bottom: 60px;
  }

  .page-about .about-side-note {
    right: 0;
    top: 120px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-split--rev {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }

  .page-about .about-split--rev .about-figure {
    order: -1;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
    padding: 36px 32px;
  }

  .page-about .about-cta__actions {
    flex-wrap: nowrap;
    justify-content: flex-end;
  }

  .page-about .about-cta__actions .cta {
    flex: 0 0 auto;
  }

  /* 横向时间轴 */
  .page-about .about-timeline {
    position: relative;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 8px;
  }

  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    top: calc(var(--about-axis) / 2);
    left: 8px;
    right: 8px;
    height: 1px;
    background: linear-gradient(to right, var(--gold-deep), var(--gold), var(--gold-deep));
  }

  .page-about .about-timeline__item {
    position: relative;
    background: transparent;
    border: 0;
    padding: 0 6px;
    gap: 14px;
  }

  .page-about .about-timeline__node {
    height: var(--about-axis);
    justify-content: center;
  }

  .page-about .about-timeline__node::after {
    display: none;
  }

  .page-about .about-timeline__year {
    display: inline-flex;
    align-items: center;
    height: 100%;
    padding: 0 12px;
    background: var(--green-900);
    position: relative;
    z-index: 1;
  }

  .page-about .about-timeline__body {
    padding: 16px 14px;
    background: var(--green-800);
    border: 1px solid var(--green-500);
    border-top: 2px solid var(--gold-deep);
    transition: border-color 0.2s ease, transform 0.2s ease;
  }

  .page-about .about-timeline__item:nth-child(even) .about-timeline__body {
    background: var(--green-700);
  }

  .page-about .about-timeline__item:hover .about-timeline__body,
  .page-about .about-timeline__item:focus-within .about-timeline__body {
    border-color: var(--orange);
    transform: translateY(-2px);
  }

  .page-about .about-timeline__hint {
    color: var(--gold);
  }

  .page-about .about-timeline__item:hover .about-timeline__hint,
  .page-about .about-timeline__item:focus-within .about-timeline__hint {
    color: var(--blue);
  }
}

/* 窄屏下悬停提示直接可读，不做隐藏 */
@media (hover: none) {
  .page-about .about-timeline__hint {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-term,
  .page-about .about-timeline__body,
  .page-about .about-paths__link,
  .page-about .about-jump a {
    transition: none;
  }

  .page-about .about-term:hover,
  .page-about .about-timeline__item:hover .about-timeline__body {
    transform: none;
  }
}
<<<END>>>