.page-about {
  --about-rail: 18px;
  background: var(--ivory);
  color: var(--ink);
  font-family: var(--font-cn);
  font-size: var(--fs-16);
  line-height: 1.85;
}

.page-about p {
  margin: 0;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 32px 0 44px;
  border-bottom: 1px solid var(--line);
  background-image:
    radial-gradient(120% 86% at 88% -12%, rgba(23, 168, 134, 0.18), transparent 62%),
    radial-gradient(92% 74% at 4% 4%, rgba(201, 162, 74, 0.16), transparent 60%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
  margin-top: 26px;
}

.page-about .about-hero__eyebrow {
  color: var(--violet);
  margin-bottom: 12px;
}

.page-about .about-hero__title {
  position: relative;
  margin: 0 0 16px;
  padding-left: 20px;
  font-size: clamp(30px, 7.6vw, var(--fs-64));
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
}

.page-about .about-hero__title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.16em;
  bottom: 0.16em;
  width: 12px;
  background: var(--emerald);
  clip-path: polygon(0 0, 100% 14px, 100% 100%, 0 100%);
}

.page-about .about-hero__text {
  max-width: 60ch;
  color: var(--ink);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* 栏目索引 */

.page-about .about-hero__index {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 20px 18px 12px;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.page-about .about-hero__index-title {
  margin: 0 0 10px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--ink);
  font-size: var(--fs-16);
  font-weight: 700;
  letter-spacing: 0.02em;
}

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

.page-about .idx-item + .idx-item {
  border-top: 1px dashed var(--line);
}

.page-about .idx-link {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  grid-template-areas:
    "num label"
    "num desc";
  gap: 1px 10px;
  padding: 11px 8px 11px 4px;
  text-decoration: none;
  color: inherit;
  transition: background-color var(--t-fast), color var(--t-fast);
}

.page-about .idx-num {
  grid-area: num;
  align-self: center;
  font-family: var(--font-num);
  font-size: 20px;
  font-weight: 600;
  color: var(--emerald);
  line-height: 1;
}

.page-about .idx-label {
  grid-area: label;
  font-weight: 700;
  font-size: var(--fs-16);
  line-height: 1.4;
}

.page-about .idx-desc {
  grid-area: desc;
  font-size: var(--fs-13);
  line-height: 1.6;
  color: var(--violet);
}

.page-about .idx-link:hover,
.page-about .idx-link:focus-visible {
  background-color: var(--gold-l);
}

.page-about .idx-link:hover .idx-num,
.page-about .idx-link:focus-visible .idx-num {
  color: var(--ruby);
}

/* ---------- 纵向卷轴 ---------- */

.page-about .about-scroll {
  position: relative;
  padding: 48px 0 56px var(--about-rail);
}

.page-about .about-scroll::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 56px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(201, 162, 74, 0.28) 72%, transparent 100%);
}

.page-about .about-scroll::after {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 56px;
  width: 10px;
  background-image: repeating-linear-gradient(
    to bottom,
    rgba(201, 162, 74, 0.75) 0 1px,
    transparent 1px 24px
  );
  pointer-events: none;
}

/* ---------- 章节 ---------- */

.page-about .chap {
  position: relative;
  padding-bottom: 56px;
}

.page-about .chap + .chap {
  padding-top: 56px;
  border-top: 1px dashed var(--line);
}

.page-about .chap--last {
  padding-bottom: 40px;
}

.page-about .chap-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 14px;
  align-items: start;
  margin-bottom: 20px;
}

.page-about .chap-head__text {
  padding-top: 2px;
}

.page-about .chap-num {
  font-family: var(--font-num);
  font-size: var(--fs-40);
  font-weight: 600;
  line-height: 0.92;
  color: var(--gold);
  letter-spacing: -0.02em;
}

.page-about .chap-title {
  margin: 0 0 4px;
  font-size: clamp(21px, 5.4vw, var(--fs-28));
  font-weight: 700;
  line-height: 1.34;
  letter-spacing: -0.01em;
}

.page-about .chap-note {
  display: block;
  color: var(--violet);
}

.page-about .chap-text {
  max-width: 68ch;
  color: var(--ink);
}

.page-about .chap-text + .chap-text {
  margin-top: 14px;
}

.page-about .chap-text--after {
  margin-top: 26px;
  padding-left: 14px;
  border-left: 3px solid var(--emerald);
  color: var(--violet);
}

/* ---------- 沿革时间线 ---------- */

.page-about .stage-list {
  position: relative;
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .stage-list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 12px;
  width: 1px;
  background: var(--line);
}

.page-about .stage {
  position: relative;
  padding: 0 0 22px 30px;
}

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

.page-about .stage::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 12px;
  height: 12px;
  background: var(--emerald);
  clip-path: polygon(50% 0, 100% 38%, 78% 100%, 22% 100%, 0 38%);
  transition: background-color var(--t-fast), transform var(--t-fast);
}

.page-about .stage:hover::before {
  background: var(--emerald-b);
  transform: scale(1.28);
}

.page-about .stage__year {
  display: inline-block;
  margin-bottom: 4px;
  font-family: var(--font-num);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ruby);
}

.page-about .stage__title {
  margin: 0 0 4px;
  font-size: var(--fs-16);
  font-weight: 700;
  line-height: 1.45;
}

.page-about .stage__text {
  max-width: 62ch;
  font-size: var(--fs-16);
  color: var(--violet);
}

/* ---------- 图片 ---------- */

.page-about .about-fig {
  margin: 28px 0 0;
}

.page-about .about-fig__media {
  position: relative;
  overflow: hidden;
  background: var(--night);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

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

.page-about .about-fig__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(152deg, rgba(36, 28, 59, 0.62) 0%, rgba(14, 107, 90, 0.3) 100%);
  pointer-events: none;
}

.page-about .about-fig figcaption {
  margin-top: 10px;
  color: var(--violet);
}

/* ---------- 规模数字卡 ---------- */

.page-about .stat-strip {
  display: grid;
  gap: 14px;
  margin: 26px 0 4px;
}

.page-about .stat-card {
  display: block;
  padding: 18px 16px 16px;
  text-decoration: none;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: background-color var(--t-fast), border-color var(--t-fast), transform var(--t-fast);
}

.page-about .stat-card:hover,
.page-about .stat-card:focus-visible {
  background: var(--gold-l);
  border-color: var(--emerald);
  transform: translateY(-2px);
}

.page-about .stat-card__num {
  font-family: var(--font-num);
  font-size: 52px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--emerald);
}

.page-about .stat-card__unit {
  margin-left: 6px;
  font-size: var(--fs-16);
  color: var(--emerald);
}

.page-about .stat-card__label {
  display: block;
  margin-top: 8px;
  font-size: var(--fs-16);
  font-weight: 700;
}

.page-about .stat-card__hint {
  display: block;
  margin-top: 4px;
  font-size: var(--fs-13);
  line-height: 1.6;
  color: var(--violet);
}

/* ---------- 双栏 ---------- */

.page-about .chap-split {
  display: grid;
  gap: 24px;
  margin-top: 20px;
}

.page-about .chap-split .about-fig {
  margin-top: 0;
}

/* ---------- 复核数据卡 ---------- */

.page-about .review-grid {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}

/* ---------- 维护分工 ---------- */

.page-about .duty-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .duty {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 0 12px;
  padding: 14px 0 14px 12px;
  border-left: 3px solid var(--gold);
  transition: background-color var(--t-fast), border-color var(--t-fast);
}

.page-about .duty + .duty {
  margin-top: 6px;
}

.page-about .duty:hover {
  background: var(--gold-l);
  border-left-color: var(--emerald);
}

.page-about .duty__num {
  font-family: var(--font-num);
  font-size: 26px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--gold);
}

.page-about .duty__title {
  margin: 0 0 2px;
  font-size: var(--fs-16);
  font-weight: 700;
  line-height: 1.45;
}

.page-about .duty__text {
  font-size: var(--fs-16);
  color: var(--violet);
}

/* ---------- 折叠 ---------- */

.page-about .fold {
  margin-top: 26px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.page-about .fold__panel {
  padding: 4px 16px 18px;
}

.page-about .fold__panel .chap-text a,
.page-about .chap-text a {
  color: var(--emerald);
  text-decoration: none;
  border-bottom: 1px solid rgba(14, 107, 90, 0.35);
  transition: border-color var(--t-fast), color var(--t-fast);
}

.page-about .fold__panel .chap-text a:hover,
.page-about .chap-text a:hover {
  color: var(--ruby);
  border-bottom-color: var(--ruby);
}

/* ---------- 联系卡片 ---------- */

.page-about .contact-cards {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .contact-card {
  display: block;
  padding: 16px 16px 16px 20px;
  text-decoration: none;
  color: var(--ink);
  background: var(--paper);
  border-left: 4px solid var(--emerald);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: background-color var(--t-fast), border-left-color var(--t-fast);
}

.page-about .contact-card:hover,
.page-about .contact-card:focus-visible {
  background: var(--gold-l);
  border-left-color: var(--ruby);
}

.page-about .contact-card__k {
  display: block;
  font-size: var(--fs-13);
  letter-spacing: 0.08em;
  color: var(--violet);
}

.page-about .contact-card__v {
  display: block;
  margin-top: 4px;
  font-size: var(--fs-16);
  font-weight: 700;
  word-break: break-word;
}

.page-about .contact-card__note {
  display: block;
  margin-top: 6px;
  font-size: var(--fs-13);
  line-height: 1.6;
  color: var(--violet);
}

/* ---------- 尾部信息条 ---------- */

.page-about .about-info-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 28px;
  justify-content: space-between;
  align-items: center;
  margin-top: 12px;
  padding: 14px 18px;
  background: var(--night);
  color: rgba(245, 239, 227, 0.84);
  font-size: var(--fs-13);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .about-info-bar__line {
  margin: 0;
}

/* ---------- 响应式 ---------- */

@media (min-width: 600px) {
  .page-about {
    --about-rail: 30px;
  }

  .page-about .stat-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-info-bar {
    padding: 16px 24px;
  }
}

@media (min-width: 760px) {
  .page-about .about-hero {
    padding: 44px 0 56px;
  }

  .page-about .chap-num {
    font-size: var(--fs-64);
  }

  .page-about .chap-head {
    gap: 10px 22px;
    margin-bottom: 24px;
  }

  .page-about .review-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

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

  .page-about .about-scroll {
    padding-top: 64px;
    padding-bottom: 72px;
  }

  .page-about .chap {
    padding-bottom: 64px;
  }

  .page-about .chap + .chap {
    padding-top: 64px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-scroll {
    --about-rail: 44px;
  }

  .page-about .about-scroll::before {
    left: 7px;
  }

  .page-about .about-scroll::after {
    left: 1px;
    width: 13px;
  }

  .page-about .chap-split {
    grid-template-columns: minmax(0, 6.5fr) minmax(0, 5.5fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .chap-split--flip {
    grid-template-columns: minmax(0, 5.5fr) minmax(0, 6.5fr);
  }

  .page-about .chap-split--flip .about-fig {
    order: -1;
  }

  .page-about .about-fig {
    margin-top: 34px;
  }
}
<<<END>>>