.page-about {
  --tl-pad: 64px;
  --tl-year: 44px;
  --tl-line: 52px;
  --about-sec: clamp(44px, 8vw, 84px);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  max-width: 56rem;
  padding-block: clamp(18px, 4vw, 38px) 0;
}

.page-about .about-hero h1 {
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(30px, 8vw, 56px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 12px 0 20px;
}

.page-about .about-hero__lead {
  font-size: clamp(16px, 4.2vw, 19px);
  line-height: 1.75;
  color: var(--ink-soft);
  max-width: 34em;
  margin: 0 0 28px;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--line-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__facts > div {
  background: var(--paper);
  padding: 14px 12px;
}

.page-about .about-hero__facts dt {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.page-about .about-hero__facts dd {
  margin: 6px 0 0;
  font-family: var(--mono);
  font-size: 22px;
  letter-spacing: 0.02em;
  color: var(--cinnabar);
}

/* ---------- 区块通用 ---------- */
.page-about .about-sec {
  padding-block: var(--about-sec) 0;
}

.page-about .about-sec h2 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(24px, 5.6vw, 34px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 10px 0 18px;
}

.page-about .about-sec h3 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(19px, 4.6vw, 24px);
  line-height: 1.4;
  color: var(--ink);
  margin: 34px 0 12px;
  padding-left: 14px;
  border-left: 3px solid var(--amber);
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-fig {
  margin: 0;
}

.page-about .about-fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-md);
}

.page-about .about-fig .frame__cap {
  display: block;
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

/* ---------- 时间轴 ---------- */
.page-about .about-nodes {
  display: grid;
  gap: 28px;
  margin-top: 26px;
}

.page-about .timeline {
  list-style: none;
  position: relative;
  margin: 6px 0 0;
  padding: 0 0 0 var(--tl-pad);
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: var(--tl-line);
  top: 10px;
  bottom: 26px;
  width: 1px;
  background: linear-gradient(180deg, var(--amber), var(--orange) 62%, rgba(232, 117, 47, 0) 100%);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 28px;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: calc(var(--tl-line) - var(--tl-pad) - 6px);
  top: 6px;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--orange);
  transition: background 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before {
  background: var(--cinnabar);
  box-shadow: 0 0 0 5px var(--mist);
}

.page-about .tl-year {
  position: absolute;
  left: calc(-1 * var(--tl-pad));
  top: 3px;
  width: var(--tl-year);
  text-align: right;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--cinnabar);
}

.page-about .tl-title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.45;
  color: var(--ink);
  margin: 0 0 6px;
}

.page-about .tl-text {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 分类 ---------- */
.page-about .about-badges {
  margin: 26px auto 0;
  max-width: 620px;
}

.page-about .about-badges img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--r-lg);
}

.page-about .about-badges .frame__cap {
  display: block;
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  text-align: center;
}

.page-about .cat-note {
  margin: 26px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .cat-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .cat-row {
  display: grid;
  grid-template-columns: 80px minmax(0, 1fr) 42px;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border-radius: var(--r-sm);
  text-decoration: none;
  color: var(--ink);
  transition: background 200ms var(--ease);
}

.page-about .cat-row:hover,
.page-about .cat-row:focus-visible {
  background: var(--mist);
}

.page-about .cat-name {
  font-size: 14.5px;
  white-space: nowrap;
}

.page-about .cat-bar {
  display: block;
  height: 9px;
  border-radius: 999px;
  background: var(--fold);
  overflow: hidden;
}

.page-about .cat-bar > span {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--amber), var(--orange));
}

.page-about .cat-row--top .cat-bar > span {
  background: linear-gradient(90deg, var(--cinnabar), var(--orange));
}

.page-about .cat-num {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  text-align: right;
  color: var(--cinnabar);
}

.page-about .basis {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .basis__item {
  border-top: 2px solid var(--amber);
  padding-top: 14px;
}

.page-about .basis__no {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .basis__title {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
  margin: 8px 0 8px;
}

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

/* ---------- 团队 ---------- */
.page-about .team-nodes {
  display: grid;
  gap: 28px;
  margin-top: 24px;
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.page-about .team-card {
  background: var(--fold);
  border-radius: var(--r-md);
  padding: 18px 16px;
}

.page-about .team-card b {
  display: block;
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(28px, 7vw, 38px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cinnabar);
}

.page-about .team-card span {
  display: block;
  margin-top: 10px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.page-about .team-notes {
  margin-top: 26px;
}

/* ---------- 地域深色带 ---------- */
.page-about .region {
  background: var(--seal);
  color: var(--paper);
  border-radius: var(--r-lg);
  padding: clamp(24px, 5vw, 46px);
}

.page-about .region .kicker {
  color: var(--amber);
}

.page-about .region h2 {
  color: var(--paper);
  margin-top: 10px;
}

.page-about .region .prose p {
  color: rgba(251, 246, 238, 0.84);
}

.page-about .region__grid {
  display: grid;
  gap: 18px;
  margin-top: 26px;
}

.page-about .region__cell {
  border-left: 2px solid var(--amber);
  padding-left: 14px;
}

.page-about .region__cell b {
  display: block;
  font-family: var(--mono);
  font-size: 22px;
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-about .region__cell span {
  display: block;
  margin-top: 8px;
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(251, 246, 238, 0.76);
}

/* ---------- 使用场景 ---------- */
.page-about .scenes {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.page-about .scene {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 22px 20px;
  transition: transform 200ms var(--ease), box-shadow 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .scene:hover,
.page-about .scene:focus-visible {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: var(--amber);
}

.page-about .scene__tag {
  margin: 0;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .scene__title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(19px, 4.6vw, 22px);
  line-height: 1.45;
  color: var(--ink);
  margin: 10px 0 10px;
}

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

.page-about .scene__go {
  display: inline-block;
  margin-top: 14px;
  font-size: 14px;
  color: var(--cinnabar);
  border-bottom: 1px solid var(--amber);
  padding-bottom: 2px;
}

/* ---------- 收尾 ---------- */
.page-about .stamp-line {
  margin: 30px 0 0;
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 22px;
  padding: 22px 20px;
  background: var(--fold);
  border-radius: var(--r-lg);
}

.page-about .about-cta__text {
  flex: 1 1 240px;
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-soft);
}

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

  .page-about .basis {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }

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

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

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

  .page-about .cat-row {
    grid-template-columns: 104px minmax(0, 1fr) 48px;
    gap: 14px;
  }

  .page-about .cat-name {
    font-size: 15.5px;
  }
}

@media (min-width: 900px) {
  .page-about {
    --tl-pad: 96px;
    --tl-year: 72px;
    --tl-line: 84px;
  }

  .page-about .about-nodes {
    grid-template-columns: minmax(0, 340px) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .team-nodes {
    grid-template-columns: minmax(0, 340px) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .scene,
  .page-about .tl-item::before,
  .page-about .cat-row {
    transition: none;
  }

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