.page-about {
  --about-rule: 1px solid var(--line-soft);
  --about-radius: 4px;
  --about-gap: clamp(20px, 3vw, 40px);
}

/* ---------- 首屏：自述 + 秩序图形 ---------- */
.page-about .about-intro {
  padding-top: clamp(28px, 5vw, 64px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-intro .crumb {
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .about-intro__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  align-items: center;
}

.page-about .about-intro__lead .lbl {
  display: block;
  margin-bottom: 14px;
  color: var(--cyan-400);
}

.page-about .about-intro__lead .h-hero {
  margin: 0 0 22px;
  max-width: 18em;
}

.page-about .about-intro__lead .prose {
  margin: 0;
}

.page-about .about-intro__facts {
  list-style: none;
  margin: 34px 0 0;
  padding: 26px 0 0;
  border-top: var(--about-rule);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 18px;
}

.page-about .about-intro__facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-intro__num {
  font-size: clamp(28px, 5vw, 44px);
  font-weight: 600;
  line-height: 1;
  color: var(--cyan-400);
}

.page-about .about-intro__facts .lbl {
  color: var(--text-400);
}

.page-about .about-intro__links {
  margin: 30px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-intro__figure {
  margin: 0;
  border-radius: var(--about-radius);
}

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

/* ---------- 职能小组：玻璃标签牌 ---------- */
.page-about .about-teams {
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-teams__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-teams__card {
  position: relative;
  display: block;
  padding: 24px 22px 22px;
  border-radius: var(--about-radius);
  border-left: 2px solid var(--ink-700);
  outline: none;
  transition: border-color 0.24s var(--ease), background 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .about-teams__card:hover,
.page-about .about-teams__card:focus,
.page-about .about-teams__card:focus-within {
  border-left-color: var(--orange-500);
  background: var(--glass-10);
  transform: translateY(-2px);
}

.page-about .about-teams__card:focus-visible {
  box-shadow: 0 0 0 2px var(--cyan-400);
}

.page-about .about-teams__no {
  display: block;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--ink-700);
  margin-bottom: 14px;
  transition: color 0.24s var(--ease);
}

.page-about .about-teams__card:hover .about-teams__no,
.page-about .about-teams__card:focus .about-teams__no {
  color: var(--cyan-400);
}

.page-about .about-teams__card .h-sub {
  margin: 0 0 8px;
}

.page-about .about-teams__scope {
  margin: 0;
  color: var(--rose-500);
}

.page-about .about-teams__duty {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-400);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.3s var(--ease), opacity 0.28s var(--ease), margin 0.3s var(--ease);
}

.page-about .about-teams__card:hover .about-teams__duty,
.page-about .about-teams__card:focus .about-teams__duty,
.page-about .about-teams__card:focus-within .about-teams__duty {
  max-height: 260px;
  opacity: 1;
  margin-top: 12px;
}

@media (hover: none) {
  .page-about .about-teams__duty {
    max-height: none;
    opacity: 1;
    margin-top: 12px;
  }
}

.page-about .about-teams__note {
  margin: 26px 0 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--text-400);
  max-width: 40em;
}

.page-about .about-teams__note a,
.page-about .about-flow__foot a {
  color: var(--cyan-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 五道工序：节点图 ---------- */
.page-about .about-flow {
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-flow__track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-flow__node {
  position: relative;
  padding: 0 0 30px 30px;
  border-left: 1px solid var(--line-soft);
  outline: none;
}

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

.page-about .about-flow__node:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 6px;
  border-radius: var(--about-radius);
}

.page-about .about-flow__dot {
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan-400);
  box-shadow: 0 0 0 4px rgba(53, 230, 210, 0.14);
  transition: box-shadow 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .about-flow__node:hover .about-flow__dot,
.page-about .about-flow__node:focus .about-flow__dot {
  background: var(--orange-500);
  box-shadow: 0 0 0 6px rgba(255, 138, 61, 0.18);
}

.page-about .about-flow__node .lbl {
  display: block;
  color: var(--text-400);
  margin-bottom: 8px;
}

.page-about .about-flow__node .h-sub {
  margin: 0 0 8px;
}

.page-about .about-flow__node p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-400);
}

.page-about .about-flow__foot {
  margin: 34px 0 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--text-400);
  max-width: 42em;
}

/* ---------- 发展阶段：分段切换 ---------- */
.page-about .about-stages {
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-stages__banner {
  margin: 0 0 clamp(28px, 4vw, 44px);
  border-radius: var(--about-radius);
}

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

.page-about .about-stages__seg {
  display: block;
}

.page-about .about-stages__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 22px;
  border-bottom: var(--about-rule);
}

.page-about .about-stages__btn {
  flex: 0 1 auto;
}

.page-about .about-stages__panels {
  padding-top: clamp(24px, 3.5vw, 40px);
}

.page-about .seg__panel[hidden] {
  display: none;
}

.page-about .about-stages__panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.page-about .about-stages__year {
  font-size: clamp(56px, 13vw, 96px);
  font-weight: 600;
  line-height: 0.9;
  color: transparent;
  -webkit-text-stroke: 1px var(--cyan-400);
  margin: 0;
}

.page-about .about-stages__body .h-sub {
  margin: 0 0 12px;
}

.page-about .about-stages__body .prose {
  margin: 0;
}

.page-about .about-stages__points {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-stages__points li {
  display: grid;
  grid-template-columns: 4.5em minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding-top: 10px;
  border-top: var(--about-rule);
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-100);
}

.page-about .about-stages__points .lbl {
  color: var(--orange-500);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

.page-about .about-partners__text .h-section {
  margin: 10px 0 20px;
}

.page-about .about-partners__text .prose {
  margin: 0 0 16px;
}

.page-about .about-partners__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-partners__item {
  padding: 20px 20px 18px;
  border-radius: var(--about-radius);
  border-left: 2px solid var(--ink-800);
}

.page-about .about-partners__item .tag {
  display: inline-block;
  margin-bottom: 12px;
}

.page-about .about-partners__item .h-sub {
  margin: 0 0 6px;
}

.page-about .about-partners__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-400);
}

.page-about .about-partners__figure {
  margin: 0;
  border-radius: var(--about-radius);
  border: var(--about-rule);
  overflow: hidden;
}

.page-about .about-partners__figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 工作节奏与联系 ---------- */
.page-about .about-rhythm {
  padding-bottom: clamp(56px, 8vw, 110px);
}

.page-about .about-rhythm__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-rhythm__card {
  padding: 22px 18px 20px;
  border-radius: var(--about-radius);
  border-top: 2px solid var(--cyan-400);
}

.page-about .about-rhythm__card:nth-child(2) {
  border-top-color: var(--orange-500);
}

.page-about .about-rhythm__card:nth-child(3) {
  border-top-color: var(--rose-500);
}

.page-about .about-rhythm__card:nth-child(4) {
  border-top-color: var(--state-open);
}

.page-about .about-rhythm__num {
  font-size: clamp(30px, 6vw, 44px);
  font-weight: 600;
  line-height: 1;
  color: var(--text-100);
  margin: 0 0 10px;
}

.page-about .about-rhythm__card .lbl {
  display: block;
  color: var(--text-400);
  margin-bottom: 10px;
}

.page-about .about-rhythm__desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--text-400);
}

.page-about .about-rhythm__contact {
  margin-top: 26px;
  padding: clamp(24px, 4vw, 36px);
  border-radius: var(--about-radius);
  border-left: 2px solid var(--orange-500);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .about-rhythm__contact-text .h-sub {
  margin: 0 0 12px;
}

.page-about .about-rhythm__contact-text > p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--text-100);
  max-width: 36em;
}

.page-about .about-rhythm__meta {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-rhythm__meta li {
  display: grid;
  grid-template-columns: minmax(5em, 6.5em) minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-100);
  word-break: break-word;
}

.page-about .about-rhythm__meta .lbl {
  color: var(--text-400);
}

.page-about .about-rhythm__meta a {
  color: var(--cyan-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-rhythm__phone {
  font-size: 16px;
  letter-spacing: 0.04em;
  color: var(--text-100);
}

.page-about .about-rhythm__cta {
  margin: 0;
  display: flex;
  align-items: flex-end;
}

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

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

@media (min-width: 900px) {
  .page-about .about-intro__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: clamp(40px, 5vw, 80px);
  }

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

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

  .page-about .about-flow__track {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-flow__node {
    border-left: none;
    border-top: 1px solid var(--line-soft);
    padding: 32px 18px 0 0;
  }

  .page-about .about-flow__node:last-child {
    border-top-color: var(--line-soft);
    padding-bottom: 0;
  }

  .page-about .about-flow__dot {
    left: 0;
    top: -5px;
  }

  .page-about .about-stages__panel {
    grid-template-columns: minmax(0, 0.28fr) minmax(0, 0.72fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-partners__figure {
    position: sticky;
    top: calc(var(--masthead-h) + 24px);
  }

  .page-about .about-rhythm__contact {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }
}

@media (min-width: 1200px) {
  .page-about .about-intro__figure {
    margin-top: -18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-teams__card,
  .page-about .about-teams__duty,
  .page-about .about-teams__no,
  .page-about .about-flow__dot {
    transition: none;
  }

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