.page-about {
  --about-rail: 208px;
  --about-line: rgba(59, 74, 122, .42);
  --about-line-soft: rgba(59, 74, 122, .24);
  padding-bottom: clamp(48px, 8vw, 110px);
}

/* ---------- 面包屑 ---------- */
.page-about__crumbs {
  padding-top: clamp(18px, 3vw, 30px);
}

/* ---------- 开篇跨页 ---------- */
.about-open {
  position: relative;
  overflow: hidden;
  padding: clamp(30px, 5.5vw, 66px) 0 clamp(46px, 8vw, 96px);
}

.about-open::after {
  content: "";
  position: absolute;
  top: -18%;
  right: -12%;
  width: 52vw;
  height: 52vw;
  max-width: 600px;
  max-height: 600px;
  background: radial-gradient(circle, rgba(255, 90, 31, .16) 0%, rgba(255, 90, 31, 0) 68%);
  pointer-events: none;
  z-index: 0;
}

.about-open::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--brand) 0%, rgba(255, 90, 31, 0) 46%);
  opacity: .6;
  z-index: 1;
}

.about-open__grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 5vw, 44px);
}

.about-open__code {
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin: 0 0 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-line-soft);
}

.about-open__note {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-dim);
  max-width: 28ch;
}

.about-open__title {
  margin: 16px 0 0;
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 58px);
  line-height: 1.1;
  letter-spacing: -.015em;
  color: var(--ink);
}

.about-open__prose {
  margin-top: clamp(18px, 3vw, 26px);
  max-width: 64ch;
}

.about-open__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 34px;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--about-line-soft);
}

.about-open__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.about-open__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3.5vw, 34px);
}

/* ---------- 画册式模块骨架 ---------- */
.about-plate {
  padding: clamp(40px, 6.5vw, 84px) 0;
}

.about-plate__inner {
  border-top: 1px solid var(--about-line-soft);
  padding-top: clamp(28px, 4vw, 52px);
}

.about-plate__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 32px);
}

.about-plate__aside {
  display: flex;
  align-items: center;
  gap: 14px;
}

.about-plate__no {
  font-size: 26px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: .06em;
  color: var(--brand);
  margin: 0;
}

.about-plate__side {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--ink-dim);
  margin: 0;
}

.about-plate__content > h2 {
  margin: 0 0 18px;
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--ink);
}

.about-plate__prose {
  max-width: 68ch;
}

.about-plate__figure {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

.about-plate__figure--lead {
  margin: 0 0 clamp(24px, 4vw, 36px);
}

.about-plate__aside-note {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-dim);
}

.about-plate__aside-note a {
  color: var(--brand-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 138, 61, .45);
}

.about-plate__aside-note a:hover,
.about-plate__aside-note a:focus-visible {
  color: var(--brand);
  border-bottom-color: var(--brand);
}

.about-plate__outro {
  margin-top: clamp(28px, 4vw, 42px);
  padding: 20px 22px;
  border-radius: var(--r-md);
  background: var(--panel);
  border-left: 3px solid var(--brand);
}

.about-plate__outro p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-body);
}

.about-plate__outro a {
  color: var(--brand-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 138, 61, .45);
}

.about-plate__outro a:hover,
.about-plate__outro a:focus-visible {
  color: var(--ink);
}

/* ---------- 档案时间线 ---------- */
.archive {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
}

.archive__item {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  column-gap: 18px;
  padding: 16px 0;
  border-bottom: 1px dashed var(--about-line-soft);
  outline: none;
}

.archive__item:first-child {
  border-top: 1px dashed var(--about-line-soft);
}

.archive__year {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--mono);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--ink-dim);
  transition: color .22s ease;
}

.archive__year::before {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--grid);
  transition: background .22s ease, box-shadow .22s ease;
}

.archive__item:hover .archive__year,
.archive__item:focus-within .archive__year {
  color: var(--brand);
}

.archive__item:hover .archive__year::before,
.archive__item:focus-within .archive__year::before {
  background: var(--brand);
  box-shadow: 0 0 0 4px rgba(255, 90, 31, .18);
}

.archive__label {
  display: block;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink);
}

.archive__detail {
  display: block;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-dim);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height .3s ease, opacity .3s ease, margin-top .3s ease;
}

.archive__item:hover .archive__detail,
.archive__item:focus-within .archive__detail {
  max-height: 8em;
  opacity: 1;
  margin-top: 6px;
}

/* ---------- 团队切换 ---------- */
.team-block {
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .switcher {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 5px;
  border-radius: var(--r-pill);
  background: var(--panel);
  border: 1px solid var(--about-line-soft);
}

.page-about .switcher__btn.is-active {
  background: var(--brand);
  color: var(--brand-ink);
  border-color: transparent;
}

.team-panel {
  margin-top: 22px;
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--r-lg);
  background: var(--panel);
  border: 1px solid var(--about-line-soft);
}

.team-panel__role {
  margin: 0;
  font-size: clamp(17px, 2.2vw, 20px);
  font-weight: 700;
  color: var(--ink);
  line-height: 1.5;
}

.team-panel__meta {
  margin: 8px 0 0;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--brand-soft);
}

.team-panel__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.team-panel__desc {
  margin: 18px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink-body);
  max-width: 62ch;
}

/* ---------- 校验流程 ---------- */
.check-steps {
  list-style: none;
  margin: clamp(24px, 4vw, 34px) 0 0;
  padding: 0;
  counter-reset: none;
}

.check-steps__item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  column-gap: 16px;
  align-items: start;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-line-soft);
}

.check-steps__item:first-child {
  border-top: 1px solid var(--about-line-soft);
}

.check-steps__no {
  font-size: 14px;
  letter-spacing: .1em;
  color: var(--brand);
  padding-top: 4px;
  border-top: 2px solid var(--brand);
}

.check-steps__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ink-body);
}

/* ---------- 地域过渡带 ---------- */
.about-plate--region .about-plate__inner {
  border-top-color: var(--about-line);
}

/* ---------- 展开组微调 ---------- */
.page-about .expand {
  margin-top: 12px;
}

.page-about .expand__panel p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink-body);
}

/* ---------- 桌面跨页布局 ---------- */
@media (min-width: 880px) {
  .about-open__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 2.08fr);
    gap: 0;
    align-items: start;
  }

  .about-open__margin {
    padding-right: clamp(24px, 3.6vw, 56px);
  }

  .about-open__body {
    border-left: 1px solid var(--about-line);
    padding-left: clamp(24px, 3.6vw, 56px);
  }

  .about-plate__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: 0;
  }

  .about-plate__aside {
    display: block;
    padding-right: clamp(20px, 3vw, 40px);
  }

  .about-plate__side {
    margin-top: 10px;
  }

  .about-plate__content {
    border-left: 1px solid var(--about-line);
    padding-left: clamp(20px, 3.4vw, 48px);
  }

  .about-plate__content > h2 {
    margin-top: -6px;
  }
}

/* ---------- 窄屏 ---------- */
@media (max-width: 720px) {
  .archive__item {
    grid-template-columns: 64px minmax(0, 1fr);
    column-gap: 14px;
  }

  .archive__year {
    font-size: 16px;
    gap: 7px;
  }

  .archive__detail {
    max-height: none;
    opacity: 1;
    margin-top: 6px;
  }

  .about-open__facts {
    gap: 12px 22px;
  }

  .check-steps__item {
    grid-template-columns: 34px minmax(0, 1fr);
    column-gap: 12px;
  }

  .team-panel {
    border-radius: var(--r-md);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .archive__detail,
  .page-about .archive__year,
  .page-about .archive__year::before {
    transition: none;
  }
}