.page-about {
  --about-rail-w: 200px;
  background: var(--ivory);
  color: var(--slate);
}

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

.page-about .about-crumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12.5px;
  letter-spacing: .04em;
}

.page-about .about-crumb__list a {
  color: var(--indigo-mid);
  text-decoration: none;
  transition: color .24s var(--ease);
}

.page-about .about-crumb__list a:hover {
  color: var(--sunrise);
}

.page-about .about-crumb__sep {
  color: var(--horizon);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 26px 0 52px;
  background:
    radial-gradient(115% 80% at 92% -6%, rgba(242, 181, 68, .26) 0%, rgba(242, 181, 68, 0) 58%),
    radial-gradient(90% 70% at -8% 4%, rgba(126, 155, 196, .2) 0%, rgba(126, 155, 196, 0) 62%),
    var(--ivory);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--ember);
}

.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(1.9rem, 6.4vw, 4.2rem);
  font-weight: 300;
  line-height: 1.16;
  letter-spacing: -.035em;
  color: var(--indigo);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 26px;
  margin-top: 26px;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 56ch;
  font-size: clamp(1rem, 1.5vw, 1.1rem);
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--ink-line);
  border: 1px solid var(--ink-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-fact {
  min-width: 0;
  padding: 14px 12px 13px;
  background: var(--ivory);
}

.page-about .about-fact__v {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 3vw, 1.55rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--sunrise);
}

.page-about .about-fact__k {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--slate);
}

/* ---------- 主框架 ---------- */
.page-about .about-shell {
  padding-bottom: 56px;
}

.page-about .about-rail {
  position: sticky;
  top: var(--cmd-h);
  z-index: 5;
  margin-bottom: 8px;
  padding: 8px 0 4px;
  background: var(--ivory);
}

.page-about .about-rail__label {
  display: none;
  margin: 0 0 10px;
  font-size: 10.5px;
  letter-spacing: .2em;
  color: var(--horizon);
}

.page-about .about-rail__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid var(--ink-line);
  border-radius: 999px;
  background: var(--ivory);
  color: var(--slate);
  font-size: 12.8px;
  white-space: nowrap;
  text-decoration: none;
  transition: background-color .26s var(--ease), border-color .26s var(--ease), color .26s var(--ease);
}

.page-about .about-rail__link:hover {
  border-color: rgba(241, 90, 41, .4);
  color: var(--indigo);
}

.page-about .about-rail__link[data-active="true"] {
  background: var(--sand);
  border-color: rgba(241, 90, 41, .45);
  color: var(--indigo);
  font-weight: 700;
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .1em;
  color: var(--sunrise);
}

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

/* ---------- 章节色带 ---------- */
.page-about .about-chapter {
  margin-bottom: 16px;
  padding: 34px 22px 38px;
  border-radius: var(--radius-lg);
  background: var(--ivory);
}

.page-about .about-chapter--sand {
  background: var(--sand);
}

.page-about .about-chapter--mist {
  background: var(--mist);
}

.page-about .about-chapter--indigo {
  background: var(--indigo);
  color: rgba(255, 253, 248, .8);
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 18px;
}

.page-about .about-chapter__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--sunrise);
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(1.45rem, 3.6vw, 2.15rem);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -.03em;
  color: var(--indigo);
}

.page-about .about-chapter--indigo .about-chapter__title {
  color: var(--ivory);
}

.page-about .about-chapter--indigo .about-chapter__num {
  color: var(--gold);
}

.page-about .about-chapter__lede {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: clamp(1rem, 1.5vw, 1.08rem);
  line-height: 1.75;
  color: var(--indigo-mid);
}

.page-about .about-chapter--indigo .about-chapter__lede {
  color: rgba(255, 253, 248, .86);
}

.page-about .about-chapter__body p {
  margin: 0 0 14px;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.8;
}

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

.page-about .about-chapter--indigo .about-chapter__body p {
  color: rgba(255, 253, 248, .8);
}

/* ---------- 图片容器 ---------- */
.page-about .media-frame {
  margin: 26px 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: linear-gradient(135deg, var(--mist), var(--sand));
}

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

/* ---------- 时间轴 ---------- */
.page-about .tl {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .tl__item {
  position: relative;
  margin-left: 5px;
  padding: 0 0 30px 28px;
  border-left: 1px solid rgba(19, 33, 60, .16);
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  top: 5px;
  left: -5.5px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--sunrise);
  box-shadow: 0 0 0 4px rgba(241, 90, 41, .14);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .tl__item:hover::before {
  transform: scale(1.32);
  box-shadow: 0 0 0 6px rgba(241, 90, 41, .2);
}

.page-about .tl__year {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 11px;
  border-radius: 999px;
  background: rgba(241, 90, 41, .11);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .09em;
  color: var(--ember);
}

.page-about .tl__title {
  margin: 0 0 8px;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--indigo);
  transition: color .26s var(--ease);
}

.page-about .tl__item:hover .tl__title {
  color: var(--ember);
}

.page-about .tl__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--slate);
}

/* ---------- 做事方式 ---------- */
.page-about .method {
  display: grid;
  gap: 12px;
}

.page-about .method-card {
  min-width: 0;
  padding: 20px 18px;
  border: 1px solid var(--ink-line);
  border-radius: var(--radius-md);
  background: var(--ivory);
  box-shadow: inset 3px 0 0 var(--gold);
}

.page-about .method-card:nth-child(2) {
  box-shadow: inset 3px 0 0 var(--sunrise);
}

.page-about .method-card:nth-child(3) {
  box-shadow: inset 3px 0 0 var(--horizon);
}

.page-about .method-card:nth-child(4) {
  box-shadow: inset 3px 0 0 var(--indigo-mid);
}

.page-about .method-card__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--horizon);
}

.page-about .method-card__title {
  margin: 0 0 8px;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--indigo);
}

.page-about .method-card__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .flows {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.page-about .flow-block {
  padding: 18px;
  border-radius: var(--radius-md);
  background: var(--mist);
}

.page-about .flow-block__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--indigo-mid);
}

.page-about .steps {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .steps li {
  padding: 6px 11px;
  border: 1px solid rgba(19, 33, 60, .1);
  border-radius: 999px;
  background: var(--ivory);
  font-size: 13px;
  font-weight: 600;
  color: var(--indigo);
}

/* ---------- 团队 ---------- */
.page-about .team-list {
  display: grid;
  gap: 9px;
}

.page-about .team-item {
  border: 1px solid var(--ink-line);
  border-radius: var(--radius-md);
  background: var(--ivory);
  overflow: hidden;
}

.page-about .team-item__sum {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 18px;
  list-style: none;
  cursor: pointer;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--indigo);
  transition: background-color .24s var(--ease);
}

.page-about .team-item__sum::-webkit-details-marker {
  display: none;
}

.page-about .team-item__sum::marker {
  content: "";
}

.page-about .team-item__hint {
  flex: none;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  color: var(--horizon);
  transition: color .24s var(--ease);
}

.page-about .team-item[open] .team-item__sum {
  background: var(--sand);
}

.page-about .team-item[open] .team-item__hint {
  color: var(--ember);
}

.page-about .team-item__body {
  margin: 0;
  padding: 6px 18px 18px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--slate);
}

.page-about .aside-note {
  margin: 22px 0 0;
  padding: 16px 18px;
  border-left: 3px solid var(--horizon);
  border-radius: var(--radius-md);
  background: rgba(126, 155, 196, .14);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--indigo-mid);
}

/* ---------- 服务与生态 ---------- */
.page-about .stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 4px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: rgba(255, 253, 248, .14);
}

.page-about .stat {
  min-width: 0;
  padding: 20px 16px;
  background: var(--indigo);
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4.4vw, 2.15rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .stat__label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: rgba(255, 253, 248, .7);
}

.page-about .about-chapter--indigo .media-frame {
  background: linear-gradient(135deg, rgba(126, 155, 196, .32), rgba(242, 181, 68, .2));
}

/* ---------- 下一步 ---------- */
.page-about .next-grid {
  display: grid;
  gap: 12px;
}

.page-about .next-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 20px 46px;
  border: 1px solid var(--ink-line);
  border-radius: var(--radius-md);
  background: var(--ivory);
  color: var(--indigo);
  text-decoration: none;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  transform: translateY(-4px);
  border-color: rgba(241, 90, 41, .42);
  box-shadow: var(--shadow-soft);
}

.page-about .next-card__label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .18em;
  color: var(--sunrise);
}

.page-about .next-card__title {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -.01em;
}

.page-about .next-card__text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .next-card__arrow {
  position: absolute;
  left: 20px;
  bottom: 16px;
  font-size: 1.1rem;
  color: var(--sunrise);
  transition: transform .3s var(--ease);
}

.page-about .next-card:hover .next-card__arrow {
  transform: translateX(5px);
}

.page-about .next-note {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--indigo-mid);
}

.page-about .next-note a {
  color: var(--ember);
  text-decoration: none;
  border-bottom: 1px solid rgba(196, 62, 28, .35);
}

.page-about .next-note a:hover {
  color: var(--sunrise);
}

/* ---------- 桌面 ---------- */
@media (min-width: 720px) {
  .page-about .method {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .flows {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

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

  .page-about .next-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero {
    padding: 34px 0 64px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    align-items: start;
    gap: 44px;
    margin-top: 34px;
  }

  .page-about .about-chapter {
    margin-bottom: 20px;
    padding: 46px 40px 50px;
  }
}

@media (min-width: 900px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    align-items: start;
    gap: 46px;
    padding-bottom: 72px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--cmd-h) + 24px);
    margin-bottom: 0;
    padding: 0;
    background: none;
  }

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

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    padding: 0;
    overflow: visible;
  }

  .page-about .about-rail__link {
    border-color: transparent;
    border-radius: var(--radius-sm);
    padding: 9px 12px;
    white-space: normal;
  }

  .page-about .about-rail__link[data-active="true"] {
    background: var(--sand);
    border-color: transparent;
    box-shadow: inset 3px 0 0 var(--sunrise);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .next-card,
  .page-about .tl__item::before,
  .page-about .next-card__arrow,
  .page-about .about-rail__link {
    transition: none;
  }

  .page-about .next-card:hover,
  .page-about .next-card:focus-visible {
    transform: none;
  }
}