.page-about {
  --about-serif: var(--font-serif);
  --about-hair: rgba(216, 228, 242, 0.24);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
}

/* ---------- 首屏 ---------- */
.page-about .about-masthead {
  position: relative;
  overflow: hidden;
  background: var(--blue);
  color: var(--glaze);
  padding: 22px 0 40px;
}

.page-about .about-masthead::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    114deg,
    rgba(192, 138, 46, 0.2) 0 1px,
    transparent 1px 58px
  );
  pointer-events: none;
}

.page-about .about-masthead::after {
  content: "";
  position: absolute;
  right: -90px;
  bottom: -140px;
  width: 320px;
  height: 320px;
  border: 1px solid rgba(192, 138, 46, 0.4);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-masthead .shell {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb__link,
.page-about .breadcrumb__current {
  color: var(--pale);
}

.page-about .breadcrumb__list {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 0.06em;
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "／";
  margin-right: 8px;
  color: var(--brass);
}

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

.page-about .about-masthead__title {
  font-family: var(--about-serif);
  font-weight: 600;
  font-size: clamp(29px, 6.6vw, 54px);
  line-height: 1.16;
  letter-spacing: 0.01em;
  margin: 14px 0 0;
  max-width: 15em;
}

.page-about .about-masthead__lede {
  font-size: 17px;
  line-height: 1.9;
  margin: 18px 0 0;
  max-width: 42em;
  color: var(--pale);
}

.page-about .about-facts {
  list-style: none;
  margin: 32px 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(255, 255, 255, 0.22);
  border-radius: 6px;
  overflow: hidden;
  backdrop-filter: blur(6px);
}

.page-about .about-facts__item {
  background: rgba(12, 31, 51, 0.34);
  padding: 15px 16px;
}

.page-about .about-facts__k {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--brass-soft);
}

.page-about .about-facts__v {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 21px;
  letter-spacing: 0.06em;
  color: var(--glaze);
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}

.page-about .about-jump__link {
  display: inline-block;
  padding: 7px 13px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--pale);
  border: 1px solid rgba(216, 228, 242, 0.34);
  border-radius: 999px;
  text-decoration: none;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-jump__link:hover,
.page-about .about-jump__link:focus-visible {
  border-color: var(--brass);
  color: var(--glaze);
  background: rgba(192, 138, 46, 0.18);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding: 52px 0;
}

.page-about .about-chapter--dark {
  background: var(--deep);
  color: var(--glaze);
  margin-top: 8px;
}

.page-about .about-chapter--geo {
  background: linear-gradient(180deg, var(--paper) 0%, #EFE7D6 100%);
}

.page-about .about-h2 {
  font-family: var(--about-serif);
  font-weight: 600;
  font-size: clamp(23px, 4.2vw, 38px);
  line-height: 1.24;
  letter-spacing: 0.01em;
  margin: 12px 0 0;
}

.page-about .about-h2--light {
  color: var(--glaze);
}

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

.page-about .about-kicker--light {
  color: var(--brass);
}

.page-about .about-lead {
  margin: 16px 0 0;
  font-size: 17px;
  line-height: 1.9;
  color: var(--gray);
}

.page-about .about-lead--light {
  color: var(--pale);
}

.page-about .about-body p {
  margin: 16px 0 0;
  font-size: 17px;
  line-height: 1.9;
  color: var(--ink);
}

.page-about .about-inline {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid var(--brass-soft);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-inline:hover,
.page-about .about-inline:focus-visible {
  border-color: var(--brass);
  color: var(--deep);
}

/* ---------- 章节布局 ---------- */
.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

/* ---------- 三阶段叙事 ---------- */
.page-about .about-stage {
  position: relative;
  padding: 22px 0 0 0;
  border-top: 1px solid var(--pale);
}

.page-about .about-stage + .about-stage {
  margin-top: 30px;
}

.page-about .about-stage__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--brass);
  margin: 0;
}

.page-about .about-stage__h {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 20px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  margin: 10px 0 0;
}

.page-about .about-body .about-stage__h {
  margin-top: 26px;
}

.page-about .about-body .about-stage__h:first-child {
  margin-top: 4px;
}

/* ---------- 团队旁注 ---------- */
.page-about .about-aside {
  border-top: 2px solid var(--brass);
  padding-top: 16px;
}

.page-about .about-aside__title {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 15px;
  letter-spacing: 0.1em;
  margin: 0 0 14px;
  color: var(--deep);
}

.page-about .about-aside__list {
  margin: 0;
  padding: 0;
}

.page-about .about-aside__list dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--brass);
  margin-top: 14px;
}

.page-about .about-aside__list dt:first-child {
  margin-top: 0;
}

.page-about .about-aside__list dd {
  margin: 4px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--gray);
}

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

.page-about .about-aside__links li + li {
  margin-top: 10px;
}

.page-about .about-aside__link {
  display: block;
  font-size: 15px;
  line-height: 1.7;
  color: var(--blue);
  text-decoration: none;
  border-left: 2px solid var(--pale);
  padding: 2px 0 2px 12px;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-aside__link:hover,
.page-about .about-aside__link:focus-visible {
  border-left-color: var(--brass);
  color: var(--deep);
}

.page-about .about-aside__foot {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--gray);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 28px 0 0;
  border-radius: 6px;
  overflow: hidden;
  background: var(--pale);
}

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

.page-about .about-figure .media__cap {
  font-size: 13px;
  line-height: 1.7;
  color: var(--gray);
  padding: 10px 14px;
  background: var(--glaze);
}

.page-about .about-figure--wide {
  margin-top: 30px;
  border-radius: 0;
  background: rgba(216, 228, 242, 0.12);
}

.page-about .about-figure--wide .media__cap {
  background: transparent;
  color: var(--pale);
}

/* ---------- 时间轴 ---------- */
.page-about .about-track-wrap {
  margin-top: 8px;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 6px;
}

.page-about .about-track {
  list-style: none;
  margin: 0;
  padding: 10px 2px 14px;
  display: flex;
  gap: 16px;
  min-width: min-content;
}

.page-about .about-node {
  position: relative;
  flex: 0 0 78%;
  min-width: 0;
  scroll-snap-align: start;
  padding: 46px 18px 20px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--about-hair);
  border-radius: 6px;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 18px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--brass);
}

.page-about .about-node::after {
  content: "";
  position: absolute;
  left: 23px;
  top: 29px;
  width: 1px;
  height: 13px;
  background: var(--brass);
}

.page-about .about-node:hover,
.page-about .about-node:focus-within {
  border-color: var(--brass);
  background: rgba(192, 138, 46, 0.1);
  transform: translateY(-2px);
}

.page-about .about-node__ver {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.1em;
  color: var(--brass-soft);
}

.page-about .about-node__h {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 18px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  margin: 8px 0 0;
  color: var(--glaze);
}

.page-about .about-node__p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--pale);
}

/* ---------- 长期栏目 ---------- */
.page-about .about-stands {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-stand {
  position: relative;
  padding: 20px 18px 20px 20px;
  background: var(--glaze);
  border-left: 3px solid var(--brass);
  border-radius: 0 6px 6px 0;
  box-shadow: 0 1px 0 rgba(12, 31, 51, 0.06);
}

.page-about .about-stand__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--brass);
}

.page-about .about-stand__h {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 19px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  margin: 8px 0 0;
  color: var(--deep);
}

.page-about .about-stand__p {
  margin: 10px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink);
}

/* ---------- 地域 ---------- */
.page-about .about-geo {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .about-geo__fig {
  margin: 0;
  border-radius: 6px;
  overflow: hidden;
  background: var(--blue);
}

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

.page-about .about-geo__fig .media__cap {
  font-size: 13px;
  line-height: 1.7;
  color: var(--pale);
  padding: 10px 14px;
  background: var(--deep);
}

.page-about .about-body .about-geo__note {
  margin-top: 20px;
}

/* ---------- 收束 ---------- */
.page-about .about-close {
  background: var(--blue);
  color: var(--glaze);
  padding: 52px 0 60px;
  position: relative;
  overflow: hidden;
}

.page-about .about-close::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brass) 0%, rgba(192, 138, 46, 0.1) 100%);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-close .about-h2 {
  color: var(--glaze);
}

.page-about .about-close .about-lead {
  color: var(--pale);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-node {
    flex: 0 0 264px;
  }

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

@media (min-width: 900px) {
  .page-about .about-masthead {
    padding: 30px 0 54px;
  }

  .page-about .about-chapter {
    padding: 74px 0;
  }

  .page-about .about-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-geo {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 48px;
    align-items: center;
  }

  .page-about .about-node {
    flex: 0 0 296px;
  }

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

@media (min-width: 1180px) {
  .page-about .about-masthead__lede {
    font-size: 18px;
  }

  .page-about .about-node {
    flex: 0 0 312px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-jump__link,
  .page-about .about-inline,
  .page-about .about-aside__link {
    transition: none;
  }

  .page-about .about-node:hover,
  .page-about .about-node:focus-within {
    transform: none;
  }
}