.page-about {
  background: var(--wx-paper);
  color: var(--wx-ink);
  font-family: var(--wx-sans);
  overflow-x: clip;
}

/* ---------- 页首 ---------- */

.page-about .about-head {
  padding-top: clamp(24px, 5vw, 52px);
  padding-bottom: clamp(18px, 3vw, 30px);
  border-bottom: 1px solid var(--wx-line);
}

.page-about .about-head__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
}

.page-about .about-head__title {
  margin: 18px 0 0;
  max-width: 24ch;
}

.page-about .about-head__lede {
  margin: 16px 0 0;
  max-width: 58ch;
}

/* ---------- 章节目录 ---------- */

.page-about .about-anchor {
  border-bottom: 1px solid var(--wx-line);
  padding: 10px 0;
}

.page-about .about-anchor__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 4px;
  overflow-x: auto;
}

.page-about .about-anchor__list li {
  flex: 0 0 auto;
}

.page-about .about-anchor__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 11px;
  font-size: 13px;
  line-height: 1.2;
  color: var(--wx-stone);
  text-decoration: none;
  border: 1px solid transparent;
  white-space: nowrap;
  transition: color 150ms var(--wx-ease), border-color 150ms var(--wx-ease), background-color 150ms var(--wx-ease);
}

.page-about .about-anchor__list a .wx-mono {
  font-size: 12px;
  color: var(--wx-copper-text);
}

.page-about .about-anchor__list a:hover,
.page-about .about-anchor__list a:focus-visible {
  color: var(--wx-ink);
  background: var(--wx-paper-layer);
  border-color: var(--wx-copper);
}

/* ---------- 通用章节骨架 ---------- */

.page-about .about-section {
  padding-top: clamp(36px, 6vw, 74px);
  padding-bottom: clamp(36px, 6vw, 74px);
}

.page-about .about-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-num {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--wx-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--wx-copper-text);
}

.page-about .about-num::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: var(--wx-line);
}

.page-about .about-body {
  min-width: 0;
}

.page-about .about-p {
  margin: 14px 0 0;
  line-height: 1.75;
  color: var(--wx-ink);
}

.page-about .about-p a,
.page-about .about-outro__text a {
  color: var(--wx-copper-text);
  text-decoration: none;
  border-bottom: 1px solid var(--wx-line);
  background-image: linear-gradient(var(--wx-copper), var(--wx-copper));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0 2px;
  transition: background-size 160ms var(--wx-ease), border-color 160ms var(--wx-ease);
}

.page-about .about-p a:hover,
.page-about .about-p a:focus-visible,
.page-about .about-outro__text a:hover,
.page-about .about-outro__text a:focus-visible {
  border-color: transparent;
  background-size: 100% 2px;
}

/* ---------- 侧栏口径备忘 ---------- */

.page-about .about-side {
  border-top: 2px solid var(--wx-ink);
  padding-top: 12px;
}

.page-about .about-side__title {
  margin: 0 0 6px;
  font-family: var(--wx-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--wx-stone);
}

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

.page-about .about-facts__row {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--wx-line);
}

.page-about .about-facts__row:last-child {
  border-bottom: 0;
}

.page-about .about-facts dt {
  font-size: 12px;
  font-family: var(--wx-mono);
  color: var(--wx-stone);
  letter-spacing: 0.02em;
}

.page-about .about-facts dd {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--wx-ink);
}

/* ---------- 沿革：深色全幅 ---------- */

.page-about .about-timeline {
  position: relative;
  overflow: hidden;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(217, 182, 120, 0.14) 1px, transparent 1px);
  background-size: 18px 18px;
  opacity: 0.5;
}

.page-about .about-timeline > .wx-container {
  position: relative;
  z-index: 1;
}

.page-about .about-timeline__kicker {
  color: var(--wx-copper-bright);
  margin: 0;
}

.page-about .about-timeline__title {
  color: var(--wx-paper);
  margin: 10px 0 0;
  max-width: 22ch;
}

.page-about .about-timeline__lede {
  margin: 14px 0 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(246, 242, 234, 0.78);
}

/* ---------- 图片容器 ---------- */

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--wx-line);
  background: var(--wx-paper-layer);
}

.page-about .about-figure__caption {
  margin: 8px 0 0;
  font-family: var(--wx-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--wx-stone);
}

.page-about .about-figure--banner {
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-figure--banner img {
  aspect-ratio: 16 / 7;
  border-color: rgba(180, 136, 75, 0.4);
}

.page-about .about-timeline .about-figure__caption {
  color: rgba(246, 242, 234, 0.6);
}

.page-about .about-figure--wide {
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-figure--wide img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--tall img {
  aspect-ratio: 5 / 6;
}

/* ---------- 时间轴 ---------- */

.page-about .about-track {
  list-style: none;
  margin: clamp(30px, 5vw, 48px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-track__node {
  position: relative;
  padding: 0 0 26px 26px;
  border-left: 2px solid rgba(180, 136, 75, 0.45);
}

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

.page-about .about-track__node::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 5px;
  width: 12px;
  height: 12px;
  background: var(--wx-copper);
  box-shadow: 0 0 0 3px var(--wx-green);
  transition: background-color 150ms var(--wx-ease), transform 150ms var(--wx-ease);
}

.page-about .about-track__node:hover::before {
  background: var(--wx-copper-bright);
  transform: scale(1.15);
}

.page-about .about-track__stage {
  margin: 0;
  font-family: var(--wx-head);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--wx-paper);
}

.page-about .about-track__cue {
  display: block;
  margin: 6px 0 10px;
  font-family: var(--wx-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--wx-copper-bright);
}

.page-about .about-track__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(246, 242, 234, 0.78);
}

.page-about .about-track__desc a {
  color: var(--wx-copper-bright);
  text-decoration: none;
  border-bottom: 1px solid rgba(217, 182, 120, 0.45);
  transition: border-color 150ms var(--wx-ease);
}

.page-about .about-track__desc a:hover,
.page-about .about-track__desc a:focus-visible {
  border-color: var(--wx-copper-bright);
}

/* ---------- 组织与分工 ---------- */

.page-about .about-team-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 26px;
}

.page-about .about-team {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 2px solid var(--wx-ink);
}

.page-about .about-team__item {
  padding: 18px 0;
  border-bottom: 1px solid var(--wx-line);
  transition: border-color 150ms var(--wx-ease);
}

.page-about .about-team__item:hover {
  border-bottom-color: var(--wx-copper);
}

.page-about .about-team__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin: 0;
}

.page-about .about-team__name {
  font-family: var(--wx-head);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--wx-ink);
}

.page-about .about-team__count {
  font-size: 13px;
  color: var(--wx-copper-text);
  letter-spacing: 0.04em;
}

.page-about .about-team__desc {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--wx-stone);
}

.page-about .about-team__desc a {
  color: var(--wx-copper-text);
  text-decoration: none;
  border-bottom: 1px solid var(--wx-line);
  transition: border-color 150ms var(--wx-ease);
}

.page-about .about-team__desc a:hover,
.page-about .about-team__desc a:focus-visible {
  border-color: var(--wx-copper);
}

/* ---------- 可追溯原则 ---------- */

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

.page-about .about-principles__item {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-top: 1px solid var(--wx-line);
  transition: border-color 150ms var(--wx-ease);
}

.page-about .about-principles__item:last-child {
  border-bottom: 1px solid var(--wx-line);
}

.page-about .about-principles__item:hover {
  border-top-color: var(--wx-copper);
}

.page-about .about-principles__no {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--wx-copper-text);
  padding-top: 4px;
}

.page-about .about-principles__item .wx-h3 {
  margin: 0;
}

.page-about .about-principles__item .about-p {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--wx-stone);
}

/* ---------- 编号复制行 ---------- */

.page-about .about-copyline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 14px;
  padding: 10px 12px;
  background: var(--wx-paper-layer);
  border: 1px solid var(--wx-line);
  border-left: 3px solid var(--wx-copper);
}

.page-about .about-copyline .wx-mono {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--wx-ink);
}

.page-about .about-copyline .wx-copy {
  font-family: var(--wx-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--wx-copper-text);
  background: transparent;
  border: 1px solid var(--wx-line);
  padding: 4px 10px;
  cursor: pointer;
  transition: border-color 150ms var(--wx-ease), color 150ms var(--wx-ease);
}

.page-about .about-copyline .wx-copy:hover,
.page-about .about-copyline .wx-copy:focus-visible {
  border-color: var(--wx-copper);
  color: var(--wx-ink);
}

.page-about .about-copyline .wx-copy__feedback {
  font-family: var(--wx-mono);
  font-size: 12px;
  color: var(--wx-copper-text);
}

/* ---------- 边界清单折叠块 ---------- */

.page-about .about-bound {
  margin-top: 26px;
  border-top: 2px solid var(--wx-ink);
}

.page-about .about-bound__fold {
  border-left: 3px solid transparent;
  border-bottom: 1px solid var(--wx-line);
  transition: border-color 160ms var(--wx-ease), background-color 160ms var(--wx-ease);
}

.page-about .about-bound__fold:has(.wx-fold__trigger[aria-expanded="true"]) {
  border-left-color: var(--wx-copper);
  background: var(--wx-paper-layer);
}

.page-about .about-fold-trigger {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  width: 100%;
  padding: 18px 12px;
  text-align: left;
  background: transparent;
  border: 0;
  cursor: pointer;
}

.page-about .about-fold-trigger__no {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--wx-copper-text);
  flex: 0 0 auto;
}

.page-about .about-fold-trigger__label {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--wx-head);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--wx-ink);
}

.page-about .about-fold-trigger__sign {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  align-self: center;
}

.page-about .about-fold-trigger__sign::before,
.page-about .about-fold-trigger__sign::after {
  content: "";
  position: absolute;
  background: var(--wx-copper-text);
  transition: transform 160ms var(--wx-ease), background-color 160ms var(--wx-ease);
}

.page-about .about-fold-trigger__sign::before {
  top: 6px;
  left: 0;
  width: 14px;
  height: 2px;
}

.page-about .about-fold-trigger__sign::after {
  top: 0;
  left: 6px;
  width: 2px;
  height: 14px;
}

.page-about .about-fold-trigger[aria-expanded="true"] .about-fold-trigger__sign::after {
  transform: scaleY(0);
}

.page-about .about-fold-trigger:hover .about-fold-trigger__sign::before,
.page-about .about-fold-trigger:hover .about-fold-trigger__sign::after,
.page-about .about-fold-trigger:focus-visible .about-fold-trigger__sign::before,
.page-about .about-fold-trigger:focus-visible .about-fold-trigger__sign::after {
  background: var(--wx-copper);
}

.page-about .about-bound__fold .wx-fold__inner {
  padding: 0 12px 20px 12px;
}

.page-about .about-bound__fold .wx-fold__inner p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--wx-stone);
  border-left: 3px solid var(--wx-line);
  padding-left: 14px;
}

/* ---------- 收尾引导 ---------- */

.page-about .about-outro {
  padding-top: clamp(28px, 4vw, 44px);
  padding-bottom: clamp(40px, 7vw, 80px);
}

.page-about .about-outro__text {
  margin: 0;
  max-width: 60ch;
  padding-top: 18px;
  border-top: 2px solid var(--wx-ink);
  font-size: 15px;
  line-height: 1.8;
  color: var(--wx-ink);
}

/* ---------- 桌面栅格 ---------- */

@media (min-width: 900px) {
  .page-about .about-row {
    grid-template-columns: 84px minmax(0, 60ch) minmax(0, 1fr);
    column-gap: 36px;
    row-gap: 0;
    align-items: start;
  }

  .page-about .about-num {
    grid-column: 1;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding-top: 4px;
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-num::after {
    flex: 0 0 auto;
    width: 2px;
    height: 44px;
    background: var(--wx-copper);
  }

  .page-about .about-body {
    grid-column: 2;
  }

  .page-about .about-side {
    grid-column: 3;
  }

  .page-about .about-row--wide > .about-body {
    grid-column: 2 / -1;
  }

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

  .page-about .about-track__node {
    padding: 28px 22px 0 0;
    border-left: 0;
    border-top: 2px solid rgba(180, 136, 75, 0.45);
  }

  .page-about .about-track__node:last-child {
    border-top-color: rgba(180, 136, 75, 0.45);
  }

  .page-about .about-track__node::before {
    left: 0;
    top: -7px;
  }

  .page-about .about-timeline__lede {
    font-size: 16px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-team-wrap {
    grid-template-columns: minmax(0, 1fr) minmax(0, 240px);
    gap: 34px;
    align-items: start;
  }

  .page-about .about-team-wrap .about-figure--tall {
    margin-top: 4px;
  }
}

/* ---------- 动效克制 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-anchor__list a,
  .page-about .about-p a,
  .page-about .about-outro__text a,
  .page-about .about-track__node::before,
  .page-about .about-fold-trigger__sign::before,
  .page-about .about-fold-trigger__sign::after,
  .page-about .about-team__item,
  .page-about .about-principles__item,
  .page-about .about-copyline .wx-copy,
  .page-about .about-bound__fold {
    transition: none;
  }

  .page-about .about-track__node:hover::before {
    transform: none;
  }
}