.page-about {
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(28px, 5vw, 64px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .breadcrumb {
  margin-bottom: clamp(28px, 5vw, 56px);
}

.page-about .about-hero__grid {
  align-items: start;
  row-gap: clamp(32px, 5vw, 64px);
}

.page-about .about-hero__eyebrow {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--fog);
  margin: 0 0 20px;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 5.4vw, 52px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--white);
  margin: 0 0 28px;
}

.page-about .about-hero__lede {
  max-width: 62ch;
  color: var(--fog);
  font-size: 16px;
  line-height: 1.9;
  margin: 0 0 32px;
}

.page-about .about-hero__tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 0;
  margin: 0;
}

/* ---------- 站点参数表 ---------- */
.page-about .about-hero__facts {
  border-top: 1px solid var(--line);
  padding-top: 20px;
}

.page-about .about-hero__facts-title {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
  margin: 0 0 18px;
}

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

.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-facts__row dt {
  color: var(--fog);
  font-size: 14px;
}

.page-about .about-facts__row dd {
  margin: 0;
  color: var(--white);
  font-size: 15px;
  font-weight: 700;
  text-align: right;
}

.page-about .about-hero__facts-note {
  margin: 20px 0 0;
  color: var(--fog);
  font-size: 13px;
  line-height: 1.8;
  border-left: 2px solid var(--line);
  padding-left: 14px;
}

/* ---------- 章节头 ---------- */
.page-about .about-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  border-top: 1px solid var(--line);
  padding-top: 22px;
  margin-bottom: clamp(36px, 5vw, 60px);
}

.page-about .about-head .section-index {
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--cyan);
  margin: 0;
}

.page-about .about-head__body .section-title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.35;
  color: var(--white);
  margin: 0 0 16px;
}

.page-about .about-head__body .lede {
  max-width: 62ch;
  color: var(--fog);
  font-size: 16px;
  line-height: 1.9;
  margin: 0;
}

/* ---------- 时间线 ---------- */
.page-about .about-tl__grid {
  row-gap: clamp(36px, 5vw, 0px);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  border-left: 1px solid var(--line);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 34px;
  outline: none;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 6px;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 1px solid var(--line);
  transition: background var(--step) var(--ease), border-color var(--step) var(--ease);
}

.page-about .timeline__item:hover::before,
.page-about .timeline__item:focus-within::before,
.page-about .timeline__item:focus::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .timeline__item--current::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .timeline__ver {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--fog);
  margin: 0 0 8px;
  transition: color var(--step) var(--ease);
}

.page-about .timeline__item:hover .timeline__ver,
.page-about .timeline__item:focus .timeline__ver,
.page-about .timeline__item:focus-within .timeline__ver {
  color: var(--cyan);
}

.page-about .timeline__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.5;
  color: var(--white);
  margin: 0 0 8px;
}

.page-about .timeline__desc {
  max-width: 58ch;
  color: var(--fog);
  font-size: 15px;
  line-height: 1.85;
  margin: 0;
}

.page-about .timeline__more {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height var(--step) var(--ease), opacity var(--step) var(--ease), margin var(--step) var(--ease);
}

.page-about .timeline__item:hover .timeline__more,
.page-about .timeline__item:focus .timeline__more,
.page-about .timeline__item:focus-within .timeline__more {
  max-height: 240px;
  opacity: 1;
  margin-top: 12px;
}

.page-about .timeline__more p {
  margin: 0;
  max-width: 58ch;
  color: var(--white);
  font-size: 14px;
  line-height: 1.85;
  border-left: 3px solid var(--cyan);
  padding-left: 14px;
}

.page-about .about-tl__aside .media-frame {
  margin: 0 0 20px;
}

.page-about .about-tl__hint {
  color: var(--fog);
  font-size: 13px;
  line-height: 1.8;
  border-top: 1px solid var(--line);
  padding-top: 16px;
  margin: 0;
}

/* ---------- 校对流程 ---------- */
.page-about .about-flow {
  row-gap: clamp(28px, 4vw, 40px);
  align-items: start;
}

.page-about .about-flow--second {
  margin-top: clamp(40px, 6vw, 72px);
  border-top: 1px solid var(--line);
  padding-top: clamp(32px, 4vw, 48px);
}

.page-about .about-flow__step {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
  margin: 0 0 14px;
}

.page-about .about-flow__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.5;
  color: var(--white);
  margin: 0 0 14px;
}

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

.page-about .about-flow__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-flow__list li {
  position: relative;
  padding: 12px 0 12px 20px;
  border-bottom: 1px solid var(--line);
  color: var(--white);
  font-size: 14px;
  line-height: 1.8;
}

.page-about .about-flow__list li::before {
  content: "/";
  position: absolute;
  left: 0;
  top: 12px;
  color: var(--cyan);
  font-family: var(--font-mono);
}

.page-about .about-flow__col--figure .media-frame {
  margin: 0;
}

.page-about .about-flow__col--note {
  border: 1px solid var(--line);
  background: var(--paper);
  padding: clamp(20px, 3vw, 28px);
}

.page-about .about-flow__note-title {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
  margin: 0 0 12px;
}

.page-about .about-flow__col--note .about-flow__text {
  color: var(--white);
}

.page-about .about-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 230, 214, 0.45);
  transition: border-color var(--step) var(--ease), color var(--step) var(--ease);
}

.page-about .about-link:hover {
  border-bottom-color: var(--cyan);
}

.page-about .about-link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  row-gap: clamp(32px, 5vw, 48px);
  align-items: start;
}

.page-about .team-list {
  margin: 0;
  border-top: 1px solid var(--line);
}

.page-about .team-list__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  transition: background var(--step) var(--ease);
}

.page-about .team-list__row:hover {
  background: var(--paper);
}

.page-about .team-list__row dt {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .team-list__count {
  font-size: 26px;
  font-weight: 700;
  color: var(--cyan);
  min-width: 46px;
  text-align: right;
}

.page-about .team-list__name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  color: var(--white);
}

.page-about .team-list__row dd {
  margin: 0 0 0 60px;
  max-width: 58ch;
  color: var(--fog);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .about-team__aside .media-frame {
  margin: 0 0 18px;
}

.page-about .about-team__note {
  margin: 0;
  color: var(--fog);
  font-size: 13px;
  line-height: 1.8;
  border-left: 2px solid var(--line);
  padding-left: 14px;
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  row-gap: clamp(24px, 3vw, 32px);
}

.page-about .cadence {
  border-top: 2px solid var(--line);
  padding-top: 20px;
  transition: border-color var(--step) var(--ease);
}

.page-about .cadence:hover {
  border-top-color: var(--cyan);
}

.page-about .cadence__freq {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
  margin: 0 0 12px;
}

.page-about .cadence__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.5;
  color: var(--white);
  margin: 0 0 12px;
}

.page-about .cadence__text {
  color: var(--fog);
  font-size: 15px;
  line-height: 1.85;
  margin: 0 0 16px;
}

.page-about .cadence__where {
  margin: 0;
  font-size: 13px;
  color: var(--fog);
}

.page-about .about-cadence__foot {
  max-width: 68ch;
  margin: clamp(34px, 5vw, 52px) 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--fog);
  font-size: 15px;
  line-height: 1.9;
}

/* ---------- 运营主体 ---------- */
.page-about .about-op {
  row-gap: clamp(32px, 5vw, 48px);
  align-items: start;
}

.page-about .about-op__lead {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(20px, 2.6vw, 26px);
  line-height: 1.6;
  color: var(--white);
  margin: 0 0 24px;
}

.page-about .about-op__text {
  max-width: 62ch;
  color: var(--fog);
  font-size: 15px;
  line-height: 1.9;
  margin: 0 0 18px;
}

.page-about .about-op__aside {
  border: 1px solid var(--line);
  background: var(--paper);
  padding: clamp(20px, 3vw, 28px);
}

.page-about .about-op__aside-title {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--fog);
  margin: 0 0 16px;
}

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

.page-about .about-op__rules li {
  position: relative;
  padding: 10px 0 10px 18px;
  border-bottom: 1px solid var(--line);
  color: var(--white);
  font-size: 14px;
  line-height: 1.8;
}

.page-about .about-op__rules li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 6px;
  height: 6px;
  background: var(--cyan);
}

.page-about .about-op__cta {
  display: inline-block;
  width: 100%;
  text-align: center;
  box-sizing: border-box;
}

/* ---------- 宽屏 ---------- */
@media (min-width: 880px) {
  .page-about .about-head {
    grid-template-columns: 88px 1fr;
    gap: 24px;
  }

  .page-about .about-head .section-index {
    padding-top: 6px;
    border-right: 1px solid var(--line);
    margin-right: 8px;
  }

  .page-about .about-hero__lead {
    padding-right: clamp(24px, 4vw, 56px);
  }

  .page-about .about-hero__facts {
    border-left: 1px solid var(--line);
    border-top: none;
    padding-top: 0;
    padding-left: clamp(20px, 3vw, 34px);
  }

  .page-about .about-team {
    align-items: start;
  }

  .page-about .team-list__row {
    grid-template-columns: 1fr;
  }

  .page-about .timeline {
    padding-left: 34px;
  }

  .page-about .timeline__item::before {
    left: -39px;
    top: 7px;
    width: 11px;
    height: 11px;
  }

  .page-about .about-flow--second {
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__title {
    font-size: 54px;
  }
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__more,
  .page-about .timeline__item::before,
  .page-about .timeline__ver,
  .page-about .cadence,
  .page-about .team-list__row,
  .page-about .about-link {
    transition: none;
  }
}