.page-about {
  --about-year-col: 148px;
  --about-card-radius: 4px var(--radius-soft) var(--radius-soft) var(--radius-soft);
  background: var(--jb-mist);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
}

.page-about .about-hero__inner {
  display: grid;
  gap: 36px;
  align-items: center;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 20ch;
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--jb-silver);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin: 30px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--jb-hairline-dark);
  list-style: none;
}

.page-about .about-hero__fact-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1.1;
  color: var(--jb-orange);
}

.page-about .about-hero__fact-label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--jb-silver);
}

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

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

.page-about .about-hero__figure .media-frame__img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

@media (prefers-reduced-motion: no-preference) {
  .page-about .about-hero__fact {
    animation: about-fade-up 420ms ease-out both;
  }
  .page-about .about-hero__fact:nth-child(1) { animation-delay: 90ms; }
  .page-about .about-hero__fact:nth-child(2) { animation-delay: 180ms; }
  .page-about .about-hero__fact:nth-child(3) { animation-delay: 270ms; }
  .page-about .about-hero__fact:nth-child(4) { animation-delay: 360ms; }
}

@keyframes about-fade-up {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 运营沿革时间线 ---------- */
.page-about .about-line__filters {
  margin: 0 0 30px;
}

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

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px 28px;
  padding: 0 0 34px 24px;
  border-left: 1px solid var(--jb-hairline);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--jb-amber);
}

.page-about .about-timeline__item[data-current]::before {
  background: var(--jb-orange);
  box-shadow: 0 0 0 5px rgba(255, 90, 31, 0.16);
}

.page-about .about-timeline__item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .about-timeline__year .num {
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--jb-steel);
}

.page-about .about-timeline__item[data-current] .about-timeline__year .num {
  color: var(--jb-orange);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--jb-ink);
}

.page-about .about-timeline__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--jb-body);
}

/* ---------- 团队 ---------- */
.page-about .about-team__diagram {
  display: block;
  width: 100%;
  max-width: 340px;
  height: auto;
  margin: 8px auto 4px;
}

.page-about .about-team__filters {
  margin: 22px 0 26px;
}

.page-about .about-team {
  display: grid;
  gap: 20px;
}

.page-about .about-team__card {
  padding: 26px 22px;
  border: 1px solid var(--jb-hairline-dark);
  border-radius: var(--about-card-radius);
  background: rgba(241, 244, 247, 0.05);
}

.page-about .about-team__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 36px;
  line-height: 1;
  color: var(--jb-orange);
}

.page-about .about-team__role {
  margin: 10px 0 10px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--jb-mist);
}

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

/* ---------- 更新节奏 ---------- */
.page-about .about-mech {
  display: grid;
  gap: 34px;
  align-items: start;
}

.page-about .about-mech__text .prose {
  margin: 0 0 20px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--jb-body);
}

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

.page-about .about-mech__figure .media-frame__img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.page-about .about-mech__fold {
  margin-top: 24px;
}

.page-about .about-cats {
  display: grid;
  gap: 0 26px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cats__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 2px 10px;
  padding: 12px 0;
  border-bottom: 1px solid var(--jb-hairline-dark);
}

.page-about .about-cats__idx {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--jb-orange);
}

.page-about .about-cats__name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--jb-mist);
}

.page-about .about-cats__desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--jb-silver);
}

/* ---------- 河北本地 ---------- */
.page-about .about-region {
  display: grid;
  gap: 32px;
  align-items: center;
}

.page-about .about-region__text .prose {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--jb-body);
}

.page-about .about-region__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 18px;
  margin: 26px 0 26px;
  padding: 20px 0 0;
  border-top: 2px solid var(--jb-steel);
  list-style: none;
}

.page-about .about-region__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1.1;
  color: var(--jb-orange-dark);
}

.page-about .about-region__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--jb-body);
}

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

.page-about .about-region__figure .media-frame__img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* ---------- 认证与备案 ---------- */
.page-about .about-cred__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cred__tag {
  padding: 11px 18px;
  border: 1px solid var(--jb-hairline-dark);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--jb-mist);
}

.page-about .about-cred__tag:nth-child(3) {
  border-color: var(--jb-orange);
  color: var(--jb-orange);
}

.page-about .about-cred__note {
  margin: 26px 0 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--jb-silver);
}

.page-about .about-cred__link {
  color: var(--jb-mist);
  text-decoration: none;
  border-bottom: 1px solid var(--jb-orange);
  padding-bottom: 1px;
}

.page-about .about-cred__link:hover,
.page-about .about-cred__link:focus-visible {
  color: var(--jb-orange);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  display: grid;
  gap: 14px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-eco__item {
  padding: 22px 20px;
  border-left: 3px solid var(--jb-steel);
  background: rgba(11, 22, 34, 0.045);
  transition: border-color 180ms ease, background-color 180ms ease;
}

.page-about .about-eco__item:hover,
.page-about .about-eco__item:focus-within,
.page-about .about-eco__item:focus-visible {
  border-left-color: var(--jb-orange);
  background: rgba(255, 90, 31, 0.07);
}

.page-about .about-eco__head {
  margin: 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--jb-ink);
}

.page-about .about-eco__detail {
  display: grid;
  grid-template-rows: 1fr;
  transition: grid-template-rows 220ms ease-out;
}

.page-about .about-eco__detail > p {
  overflow: hidden;
  margin: 0;
  padding-top: 10px;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--jb-body);
}

/* ---------- 继续往下查 ---------- */
.page-about .about-next {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.page-about .about-next__card {
  display: block;
  padding: 24px 22px;
  border: 1px solid var(--jb-hairline-dark);
  border-radius: var(--about-card-radius);
  background: rgba(241, 244, 247, 0.05);
  text-decoration: none;
  transition: border-color 180ms ease, background-color 180ms ease;
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--jb-orange);
  background: rgba(255, 90, 31, 0.1);
}

.page-about .about-next__kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--jb-orange);
}

.page-about .about-next__text {
  display: block;
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--jb-silver);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-cats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: clamp(36px, 5vw, 76px);
  }

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

  .page-about .about-timeline__item {
    grid-template-columns: var(--about-year-col) minmax(0, 1fr);
    padding-bottom: 46px;
  }

  .page-about .about-timeline__year {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-timeline__year .num {
    font-size: 34px;
  }

  .page-about .about-team__diagram {
    margin-left: 0;
  }

  .page-about .about-mech {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-region {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(32px, 5vw, 64px);
  }
}

@media (min-width: 900px) and (hover: hover) {
  .page-about .about-eco__detail {
    grid-template-rows: 0fr;
  }

  .page-about .about-eco__item:hover .about-eco__detail,
  .page-about .about-eco__item:focus-within .about-eco__detail {
    grid-template-rows: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-eco__detail,
  .page-about .about-eco__item,
  .page-about .about-next__card {
    transition: none;
  }
}
<<<END>>>