.page-about .breadcrumbs {
  padding-top: 8px;
  margin-bottom: 40px;
  font-size: 13px;
  color: var(--silver);
}

.page-about .breadcrumbs a {
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

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

.page-about .about-hero {
  padding-bottom: clamp(56px, 9vw, 96px);
}

.page-about .about-hero__rule {
  width: 88px;
  height: 2px;
  margin-bottom: 28px;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
}

.page-about .about-hero h1 {
  margin: 0 0 24px;
  font-size: clamp(2.1rem, 7.2vw, 4.1rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--white);
  max-width: 18ch;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 66ch;
  font-size: clamp(1rem, 2.4vw, 1.1rem);
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(32px, 5vw, 48px);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-stats__cell {
  background: var(--panel);
  padding: 20px 16px;
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(1.45rem, 5vw, 2rem);
  letter-spacing: 0.04em;
  color: var(--white);
  line-height: 1.1;
}

.page-about .about-stats__cell:first-child .about-stats__num,
.page-about .about-stats__cell:nth-child(2) .about-stats__num {
  color: var(--amber);
}

.page-about .about-stats__label {
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--silver);
}

.page-about .about-block {
  padding: clamp(56px, 9vw, 104px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-block__head {
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .about-block__head h2 {
  margin: 10px 0 16px;
  font-size: clamp(1.55rem, 4.6vw, 2.5rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  font-weight: 800;
  color: var(--white);
  max-width: 22ch;
}

.page-about .about-block__head .section__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-block__body {
  max-width: 68ch;
}

.page-about .about-block__body p {
  margin: 0 0 1.2em;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-block__body p:last-child {
  margin-bottom: 0;
}

/* 时间线 */
.page-about .about-timeline__figure {
  margin: 0 0 clamp(32px, 5vw, 52px);
}

.page-about .about-timeline__figure .figure__frame {
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .timeline {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.page-about .timeline__item {
  position: relative;
  border-bottom: 1px solid var(--line);
}

.page-about .timeline__item::after {
  content: "";
  display: block;
  height: 1px;
  width: 100%;
  transform-origin: left center;
}

.page-about .timeline__item:nth-child(odd)::after {
  background: linear-gradient(90deg, var(--cyan), rgba(34, 227, 210, 0) 72%);
}

.page-about .timeline__item:nth-child(even)::after {
  background: linear-gradient(90deg, var(--amber), rgba(255, 179, 71, 0) 72%);
}

.page-about .timeline__trigger {
  display: grid;
  grid-template-columns: 3.6rem 1fr 14px;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 22px 2px;
  background: none;
  border: 0;
  text-align: left;
  cursor: pointer;
  color: inherit;
  font: inherit;
  transition: background-color 220ms var(--ease);
}

.page-about .timeline__trigger:hover {
  background: rgba(232, 237, 243, 0.04);
}

.page-about .timeline__trigger:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .timeline__year {
  font-size: 1rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .timeline__item:nth-child(even) .timeline__year {
  color: var(--amber);
}

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

.page-about .timeline__title {
  font-size: clamp(1rem, 2.8vw, 1.15rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.35;
}

.page-about .timeline__meta {
  font-size: 13px;
  line-height: 1.6;
  color: var(--silver);
}

.page-about .timeline__icon {
  justify-self: end;
  width: 9px;
  height: 9px;
  border-right: 1.5px solid var(--silver);
  border-bottom: 1.5px solid var(--silver);
  transform: rotate(45deg);
  transition: transform 260ms var(--ease), border-color 260ms var(--ease);
}

.page-about .timeline__item[data-open] .timeline__icon {
  transform: rotate(-135deg);
  border-color: var(--cyan);
}

.page-about .timeline__body {
  padding: 0 2px 24px;
}

.page-about .timeline__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--silver);
}

/* 四步流程 */
.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
  counter-reset: flow;
}

.page-about .flow__step {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  transition: border-color 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .flow__step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 20px;
  width: 44px;
  height: 2px;
  background: var(--amber);
}

.page-about .flow__step:hover {
  border-color: rgba(34, 227, 210, 0.55);
  transform: translateY(-2px);
}

.page-about .flow__num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
  margin-bottom: 12px;
}

.page-about .flow__title {
  margin: 0 0 10px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .flow__text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--silver);
}

/* 团队 */
.page-about .team {
  display: grid;
  gap: 28px;
}

.page-about .team__figure {
  margin: 0;
  order: -1;
}

.page-about .team__figure .figure__frame {
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .team-tree {
  padding: clamp(20px, 4vw, 30px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
}

.page-about .team-tree__root {
  display: flex;
  justify-content: flex-start;
}

.page-about .team-tree__node {
  display: inline-block;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: var(--graphite);
  color: var(--white);
  font-size: 13px;
  line-height: 1.4;
  transition: border-color 220ms var(--ease), color 220ms var(--ease);
}

.page-about .team-tree__node--root {
  background: transparent;
  border-color: var(--amber);
  color: var(--amber);
  letter-spacing: 0.04em;
}

.page-about .team-tree__node--accent {
  border-color: rgba(34, 227, 210, 0.6);
  color: var(--cyan);
  background: transparent;
}

.page-about .team-tree__branches {
  list-style: none;
  margin: 22px 0 0;
  padding: 0 0 0 20px;
  border-left: 1px solid rgba(167, 176, 188, 0.35);
}

.page-about .team-tree__branch {
  position: relative;
  padding: 12px 0 16px;
}

.page-about .team-tree__branch::before {
  content: "";
  position: absolute;
  left: -20px;
  top: 28px;
  width: 16px;
  height: 1px;
  background: rgba(167, 176, 188, 0.35);
  transition: background-color 220ms var(--ease), width 220ms var(--ease);
}

.page-about .team-tree__branch:hover::before {
  width: 20px;
  background: var(--cyan);
}

.page-about .team-tree__branch:hover .team-tree__node {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .team-tree__desc {
  margin: 10px 0 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--silver);
  max-width: 46ch;
}

/* 适配合作 */
.page-about .partner {
  display: grid;
  gap: 24px;
}

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

.page-about .partner__figure .figure__frame {
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .partner__panel {
  padding: clamp(20px, 4vw, 30px);
  border-radius: var(--radius-m);
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
}

.page-about .partner__list {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  overflow: hidden;
}

.page-about .partner__row {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  background: var(--ink);
}

.page-about .partner__row dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--silver);
}

.page-about .partner__row dd {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--white);
}

.page-about .partner__row dd.mono {
  font-size: 1.15rem;
  letter-spacing: 0.04em;
  color: var(--amber);
}

.page-about .partner__note {
  margin: 20px 0 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--silver);
}

/* 下一步 */
.page-about .next {
  display: grid;
  gap: 16px;
}

.page-about .next__card {
  padding: 24px 22px 26px;
  border-radius: var(--radius-m);
  background: var(--panel);
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  transition: border-color 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .next__card:hover {
  border-color: rgba(34, 227, 210, 0.5);
  transform: translateY(-2px);
}

.page-about .next__title {
  margin: 0 0 12px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .next__text {
  margin: 0 0 22px;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .next__card .btn {
  margin-top: auto;
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-stats__cell {
    padding: 24px 20px;
  }

  .page-about .timeline__trigger {
    grid-template-columns: 5rem 1fr 18px;
    gap: 20px;
    padding: 26px 4px;
  }

  .page-about .timeline__year {
    font-size: 1.1rem;
  }

  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

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

@media (min-width: 960px) {
  .page-about .about-block--shift .about-block__head,
  .page-about .about-block--shift .about-block__body,
  .page-about .about-block--shift .flow,
  .page-about .about-block--shift .partner {
    margin-left: 4%;
  }

  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .team {
    grid-template-columns: 7fr 5fr;
    align-items: start;
    gap: 32px;
  }

  .page-about .team__figure {
    order: 0;
  }

  .page-about .partner {
    grid-template-columns: 7fr 5fr;
    align-items: start;
    gap: 32px;
  }

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

  .page-about .timeline__trigger {
    grid-template-columns: 6rem 1fr 20px;
    padding: 30px 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flow__step,
  .page-about .next__card,
  .page-about .timeline__icon,
  .page-about .team-tree__node,
  .page-about .team-tree__branch::before {
    transition: none;
  }

  .page-about .flow__step:hover,
  .page-about .next__card:hover {
    transform: none;
  }
}