.page-about {
  --about-rail: 64px;
  --about-space: clamp(56px, 8vw, 104px);
  color: var(--ink);
  background: var(--paper);
}

.page-about .mono {
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: calc(var(--header-h) + clamp(28px, 5vw, 64px));
  padding-bottom: clamp(40px, 6vw, 80px);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(232, 226, 214, 0.62), rgba(247, 246, 242, 0) 74%);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(32px, 5vw, 64px);
  align-items: end;
}

.page-about .about-hero__main .crumbs {
  margin-bottom: 22px;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.05rem, 6.2vw, 4.3rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
}

.page-about .about-hero .lede {
  margin: 22px 0 0;
  max-width: 48ch;
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.9;
  color: var(--ink);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-facts {
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 20px 20px 8px;
}

.page-about .about-facts__cap {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--pencil);
}

.page-about .about-facts__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-facts__list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  border-top: 1px dashed var(--line);
}

.page-about .about-facts__k {
  font-size: 12px;
  color: var(--forest);
}

.page-about .about-facts__v {
  font-size: 13px;
  color: var(--pencil);
}

/* ---------- 主体与左侧编号栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
  padding-top: clamp(40px, 6vw, 72px);
  padding-bottom: clamp(56px, 8vw, 112px);
}

.page-about .spy__cap {
  margin: 0 0 10px;
  font-size: 10px;
  letter-spacing: 0.24em;
  color: var(--pencil);
}

.page-about .spy__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 6px;
  overflow-x: auto;
}

.page-about .spy__link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  text-decoration: none;
  color: var(--pencil);
  white-space: nowrap;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .spy__link:hover,
.page-about .spy__link:focus-visible {
  color: var(--ink);
  border-color: var(--line-strong);
  outline: 2px solid var(--highlight);
  outline-offset: 2px;
}

.page-about .about-rail__num {
  font-size: 11px;
  color: var(--autumn);
}

.page-about .about-rail__label {
  font-size: 12px;
}

.page-about .spy__link[aria-current="true"] {
  color: var(--ink);
  border-color: var(--line-strong);
}

.page-about .spy__link[aria-current="true"] .about-rail__num {
  background: var(--highlight);
  padding: 1px 3px;
}

/* ---------- 章节头 ---------- */
.page-about .about-section + .about-section {
  margin-top: var(--about-space);
}

.page-about .about-head {
  padding-top: 20px;
  border-top: 1px solid var(--line);
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-head__num {
  display: block;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--autumn);
  margin-bottom: 12px;
}

.page-about .about-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.4vw, 2.4rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .about-head__lede {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--pencil);
}

/* ---------- 时间轴 ---------- */
.page-about .about-history {
  display: grid;
  gap: clamp(32px, 4vw, 56px);
  align-items: start;
}

.page-about .about-tl {
  list-style: none;
  margin: 0 0 0 5px;
  padding: 0;
  border-left: 1px solid var(--line-strong);
}

.page-about .about-tl__item {
  position: relative;
  padding: 0 0 clamp(36px, 5vw, 56px) clamp(22px, 3vw, 34px);
  outline: none;
}

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

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--line-strong);
  transition: background-color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .about-tl__item:hover::before,
.page-about .about-tl__item:focus-visible::before {
  background: var(--highlight);
  border-color: var(--ink);
}

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

.page-about .about-tl__ver {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 2px 7px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r);
  background: var(--beige);
}

.page-about .about-tl__date {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--pencil);
}

.page-about .about-tl__title {
  margin: 12px 0 8px;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .about-tl__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-tl__note {
  margin-top: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--pencil);
  border-left: 2px solid var(--beige);
  padding-left: 0;
  transition: max-height 280ms var(--ease), opacity 200ms var(--ease), margin-top 280ms var(--ease), padding-left 280ms var(--ease);
}

.page-about .about-tl__item:hover .about-tl__note,
.page-about .about-tl__item:focus-within .about-tl__note,
.page-about .about-tl__item:focus .about-tl__note {
  max-height: 200px;
  opacity: 1;
  margin-top: 12px;
  padding-left: 12px;
}

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin: 0;
  padding: 9px;
  border: 1px solid var(--line);
  background: var(--beige);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .about-figure figcaption {
  padding-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--pencil);
}

.page-about .about-team__figure {
  margin-bottom: clamp(26px, 4vw, 44px);
}

/* ---------- 分工卡 ---------- */
.page-about .about-cards {
  display: grid;
  gap: var(--gap);
  align-items: end;
}

.page-about .about-cards__card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 0 20px 22px;
  border: 1px solid var(--line);
  background: var(--paper);
  outline: none;
  transition: border-color 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .about-cards__card::before {
  content: "";
  display: block;
  height: 4px;
  margin: 0 -20px 18px;
  background: var(--season-c);
  transition: background-color 220ms var(--ease);
}

.page-about .about-cards__card--spring { --season-c: var(--spring); }
.page-about .about-cards__card--summer { --season-c: var(--summer); }
.page-about .about-cards__card--autumn { --season-c: var(--autumn); }

.page-about .about-cards__card:hover,
.page-about .about-cards__card:focus-visible {
  border-color: var(--highlight);
  transform: translateY(-4px);
}

.page-about .about-cards__card:hover::before,
.page-about .about-cards__card:focus-visible::before {
  background: var(--highlight);
}

.page-about .about-cards__card .tag {
  align-self: flex-start;
}

.page-about .about-cards__title {
  margin: 0;
  font-size: 1.08rem;
  line-height: 1.45;
  font-weight: 700;
}

.page-about .about-cards__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-cards__foot {
  margin: auto 0 0;
  padding-top: 12px;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--pencil);
  border-top: 1px dashed var(--line);
}

/* ---------- 通栏窄带 ---------- */
.page-about .about-band {
  position: relative;
  margin-top: var(--about-space);
  padding: clamp(26px, 4vw, 40px) clamp(20px, 3vw, 32px);
  background: var(--beige);
  border-top: 1px dashed var(--line-strong);
  border-bottom: 1px dashed var(--line-strong);
  display: grid;
  gap: 22px;
}

.page-about .about-band__spine {
  display: none;
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--pencil);
  writing-mode: vertical-rl;
}

.page-about .about-band__lead {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.15rem, 2.6vw, 1.6rem);
  line-height: 1.5;
}

.page-about .about-band__sub {
  margin: 12px 0 20px;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--pencil);
}

.page-about .about-figure--band {
  background: var(--paper);
}

/* ---------- 两版对照表 ---------- */
.page-about .about-tablewrap {
  border: 1px solid var(--line);
  overflow-x: auto;
}

.page-about .about-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 14.5px;
}

.page-about .about-table__caption {
  caption-side: top;
  text-align: left;
  padding: 12px 14px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--pencil);
  border-bottom: 1px dashed var(--line);
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  line-height: 1.75;
  border-bottom: 1px solid var(--line);
}

.page-about .about-table thead th {
  background: var(--beige);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--forest);
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-table tbody th {
  font-weight: 600;
  color: var(--forest);
  white-space: nowrap;
}

.page-about .about-table tbody tr:last-child th,
.page-about .about-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-legacy {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  margin-top: 24px;
  padding: 18px 20px;
  border: 1px solid var(--line-strong);
  border-left: 4px solid var(--forest);
  background: var(--paper);
  color: var(--ink);
  text-decoration: none;
  transition: border-color 220ms var(--ease), background-color 220ms var(--ease);
}

.page-about .about-legacy:hover,
.page-about .about-legacy:focus-visible {
  border-color: var(--highlight);
  border-left-color: var(--autumn);
  background: var(--beige);
  outline: 2px solid var(--highlight);
  outline-offset: 2px;
}

.page-about .about-legacy__tag {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--pencil);
}

.page-about .about-legacy__title {
  font-weight: 700;
  font-size: 1rem;
}

.page-about .about-legacy__hint {
  flex-basis: 100%;
  font-size: 13px;
  line-height: 1.75;
  color: var(--pencil);
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 260ms var(--ease), opacity 200ms var(--ease);
}

.page-about .about-legacy:hover .about-legacy__hint,
.page-about .about-legacy:focus-visible .about-legacy__hint {
  max-height: 80px;
  opacity: 1;
}

/* ---------- 数字与节奏 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stats__cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  background: var(--paper);
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.2vw, 2.1rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--forest);
}

.page-about .about-stats__label {
  font-size: 12.5px;
  color: var(--pencil);
}

.page-about .about-rhythm {
  margin-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--line);
}

.page-about .about-rhythm__row {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rhythm__key {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--autumn);
}

.page-about .about-rhythm__val {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink);
}

/* ---------- 地区与合作 ---------- */
.page-about .about-links {
  display: grid;
  gap: var(--gap);
}

.page-about .about-linkcard {
  position: relative;
  display: block;
  padding: 22px 20px 24px;
  border: 1px solid var(--line);
  border-top: 4px solid var(--season-c, var(--winter));
  background: var(--paper);
  color: var(--ink);
  text-decoration: none;
  transition: border-color 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .about-linkcard--autumn { --season-c: var(--autumn); }
.page-about .about-linkcard--summer { --season-c: var(--summer); }

.page-about .about-linkcard:hover,
.page-about .about-linkcard:focus-visible {
  border-color: var(--highlight);
  border-top-color: var(--highlight);
  transform: translateY(-4px);
  outline: 2px solid var(--highlight);
  outline-offset: 2px;
}

.page-about .about-linkcard__tag {
  display: block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--pencil);
  margin-bottom: 10px;
}

.page-about .about-linkcard__title {
  display: block;
  font-weight: 700;
  font-size: 1.02rem;
  line-height: 1.5;
  margin-bottom: 10px;
}

.page-about .about-linkcard__text {
  display: block;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--pencil);
}

.page-about .about-linkcard__arrow {
  display: block;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--autumn);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-rhythm__row {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }

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

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

@media (min-width: 820px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }

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

  .page-about .about-history {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-about .spy__list {
    flex-direction: column;
    gap: 14px;
    overflow: visible;
  }

  .page-about .spy__link {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 2px 0 2px 10px;
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
  }

  .page-about .spy__link[aria-current="true"] {
    border-left-color: var(--autumn);
  }

  .page-about .about-band {
    grid-template-columns: auto minmax(0, 1fr) minmax(0, 1fr);
    align-items: center;
    gap: clamp(24px, 3vw, 40px);
  }

  .page-about .about-band__spine {
    display: block;
  }
}

@media (hover: none), (max-width: 1023px) {
  .page-about .about-tl__note {
    max-height: none;
    opacity: 1;
    margin-top: 10px;
    padding-left: 12px;
    border-left: 2px solid var(--beige);
  }

  .page-about .about-legacy__hint {
    max-height: none;
    opacity: 1;
    margin-top: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__note,
  .page-about .about-legacy__hint,
  .page-about .about-cards__card,
  .page-about .about-linkcard,
  .page-about .spy__link {
    transition: color 160ms linear, border-color 160ms linear, background-color 160ms linear;
  }

  .page-about .about-cards__card:hover,
  .page-about .about-linkcard:hover {
    transform: none;
  }
}
<<<END>>>