.page-about {
  --about-radius: 3px;
  --about-violet-soft: rgba(123, 75, 255, .16);
  padding-top: .5rem;
  padding-bottom: 5rem;
  color: var(--fog);
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  margin: 1.5rem 0 1.25rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .22s var(--ease), border-color .22s var(--ease);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  margin-bottom: 3.5rem;
  padding: 1px;
  border-radius: var(--about-radius);
  background: linear-gradient(150deg, rgba(123, 75, 255, .6), rgba(18, 240, 200, .2) 42%, rgba(30, 42, 51, .95) 80%);
}

.page-about .about-hero-plate {
  position: relative;
  overflow: hidden;
  padding: clamp(1.5rem, 6vw, 3.75rem);
  border-radius: var(--about-radius);
  background:
    radial-gradient(circle at 88% 6%, rgba(123, 75, 255, .3), transparent 44%),
    radial-gradient(circle at 6% 94%, rgba(18, 240, 200, .13), transparent 42%),
    var(--rock);
}

.page-about .about-hero-plate::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(to bottom, rgba(232, 244, 242, .035) 0 1px, transparent 1px 7px);
}

.page-about .about-kicker {
  position: relative;
  margin: 0 0 1rem;
  font-size: .72rem;
  letter-spacing: .18em;
  color: var(--violet);
  text-transform: uppercase;
}

.page-about .display-title {
  position: relative;
  margin: 0 0 1.15rem;
  max-width: 22ch;
}

.page-about .lede {
  position: relative;
  max-width: 58ch;
  margin: 0;
  color: var(--mist);
  font-size: 1rem;
  line-height: 1.8;
}

.page-about .about-hero-stats {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero-stats li {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  padding: 1rem 1.15rem;
  background: var(--ink);
}

.page-about .about-stat-num {
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
}

.page-about .about-stat-label {
  font-size: .82rem;
  color: var(--mist);
  letter-spacing: .04em;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  margin-bottom: 4.5rem;
}

.page-about .sec-head {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: center;
  column-gap: .8rem;
  row-gap: .7rem;
  margin-bottom: 1.75rem;
}

.page-about .sec-num {
  padding: .18rem .5rem;
  border: 1px solid var(--violet);
  border-radius: 2px;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--violet);
}

.page-about .band--violet {
  display: block;
  width: 52px;
  height: 2px;
  background: linear-gradient(90deg, var(--violet), rgba(123, 75, 255, 0));
}

.page-about .sec-title {
  grid-column: 1 / -1;
  margin: 0;
  font-size: clamp(1.45rem, 4.2vw, 2.3rem);
  line-height: 1.25;
  letter-spacing: -.01em;
}

.page-about .sec-desc {
  grid-column: 1 / -1;
  margin: 0;
  max-width: 62ch;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about p {
  line-height: 1.8;
}

/* ---------- 01 起源 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-about .about-copy--narrow {
  max-width: 56ch;
}

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

.page-about .about-copy p {
  margin: 0 0 1.1rem;
  font-size: .98rem;
}

.page-about .about-defs {
  margin: 1.75rem 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-defs > div {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: .35rem 1rem;
  padding: .85rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-defs dt {
  font-weight: 700;
  color: var(--neon);
  letter-spacing: .04em;
}

.page-about .about-defs dd {
  margin: 0;
  font-size: .92rem;
  color: var(--mist);
  line-height: 1.7;
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--rock);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 12 / 7;
}

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

.page-about .about-caption {
  padding: .85rem 1rem;
  border-top: 1px solid var(--line);
  font-size: .82rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 02 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.page-about .about-team-panel {
  padding: 1.4rem;
  border: 1px solid rgba(123, 75, 255, .45);
  border-radius: var(--about-radius);
  background: var(--about-violet-soft);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.page-about .about-panel-title {
  margin: 0 0 1.1rem;
  font-size: .92rem;
  letter-spacing: .1em;
  color: var(--fog);
}

.page-about .about-team-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: rgba(232, 244, 242, .12);
}

.page-about .about-team-stats li {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  padding: .85rem .9rem;
  background: var(--rock);
}

.page-about .about-team-num {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--fog);
  line-height: 1;
}

.page-about .about-team-label {
  font-size: .76rem;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-team-copy p {
  font-size: .96rem;
  margin: 0 0 1.1rem;
}

.page-about .about-flow {
  margin: 1.4rem 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--line);
}

.page-about .about-flow li {
  position: relative;
  padding: 0 0 1.2rem 1.1rem;
}

.page-about .about-flow li:last-child {
  padding-bottom: 0;
}

.page-about .about-flow li::before {
  content: "";
  position: absolute;
  top: .45rem;
  left: -4px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--violet);
}

.page-about .about-flow-kicker {
  display: inline-block;
  margin-bottom: .3rem;
  font-size: .74rem;
  letter-spacing: .12em;
  color: var(--neon);
}

.page-about .about-flow p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 03 运营半径 ---------- */
.page-about .about-radius {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}

.page-about .about-radius-figures {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  align-self: start;
}

.page-about .about-radius-figures li {
  display: flex;
  align-items: baseline;
  gap: .9rem;
  padding: .95rem 1.1rem;
  background: var(--ink);
}

.page-about .about-radius-num {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--neon);
  line-height: 1;
}

.page-about .about-radius-label {
  font-size: .82rem;
  color: var(--mist);
  line-height: 1.5;
}

/* ---------- 04 时间带 ---------- */
.page-about .timeline-track {
  position: relative;
  margin-top: .5rem;
}

.page-about .timeline {
  display: flex;
  gap: 1rem;
  margin: 0;
  padding: .25rem 0 1rem;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--violet) transparent;
}

.page-about .timeline::-webkit-scrollbar {
  height: 4px;
}

.page-about .timeline::-webkit-scrollbar-thumb {
  background: var(--violet);
  border-radius: 2px;
}

.page-about .timeline-node {
  position: relative;
  flex: 0 0 min(84vw, 360px);
  scroll-snap-align: start;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.page-about .timeline-node::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--violet);
  box-shadow: 0 0 0 4px rgba(123, 75, 255, .18);
}

.page-about .timeline-ver {
  margin: 0 0 .55rem;
  font-size: .78rem;
  letter-spacing: .1em;
  color: var(--violet);
}

.page-about .timeline-title {
  margin: 0 0 .7rem;
  font-size: 1.05rem;
  line-height: 1.45;
  color: var(--fog);
}

.page-about .timeline-node p:last-child {
  margin: 0;
  font-size: .88rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 05 准则 ---------- */
.page-about .about-creed {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0 0 1.75rem;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-creed li {
  padding: 1.35rem 1.25rem;
  background: var(--rock);
}

.page-about .about-creed h3 {
  margin: 0 0 .6rem;
  font-size: 1rem;
  line-height: 1.4;
  color: var(--neon);
}

.page-about .about-creed p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-acc {
  border-top: 1px solid var(--line);
}

.page-about .about-acc details {
  border-bottom: 1px solid var(--line);
}

.page-about .about-acc summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem .25rem;
  cursor: pointer;
  font-size: .95rem;
  font-weight: 600;
  color: var(--fog);
  list-style: none;
}

.page-about .about-acc summary::-webkit-details-marker {
  display: none;
}

.page-about .about-acc summary::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--violet);
  transition: transform .22s var(--ease);
}

.page-about .about-acc details[open] summary::after {
  content: "−";
}

.page-about .about-acc summary:focus-visible {
  outline: 1px solid var(--neon);
  outline-offset: 3px;
}

.page-about .about-acc-body {
  padding: 0 .25rem 1.25rem;
  max-width: 66ch;
}

.page-about .about-acc-body p {
  margin: 0 0 .9rem;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--mist);
}

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

/* ---------- 后续入口 ---------- */
.page-about .about-next {
  padding-top: 2.25rem;
  border-top: 1px solid var(--line);
}

.page-about .about-next-title {
  margin: 0 0 1.25rem;
  font-size: clamp(1.2rem, 3.2vw, 1.6rem);
  letter-spacing: -.01em;
}

.page-about .about-next-links {
  display: grid;
  grid-template-columns: 1fr;
  gap: .85rem;
}

.page-about .about-next-card {
  display: flex;
  flex-direction: column;
  gap: .45rem;
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: var(--rock);
  text-decoration: none;
  color: var(--fog);
  transition: border-color .24s var(--ease), transform .24s var(--ease), background .24s var(--ease);
}

.page-about .about-next-card:hover,
.page-about .about-next-card:focus-visible {
  border-color: var(--violet);
  background: rgba(123, 75, 255, .12);
  transform: translateY(-2px);
}

.page-about .about-next-kicker {
  font-size: .74rem;
  letter-spacing: .12em;
  color: var(--violet);
}

.page-about .about-next-text {
  font-size: .9rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-next-note {
  margin: 1.5rem 0 0;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-next-note a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(18, 240, 200, .4);
}

.page-about .about-next-note a:hover,
.page-about .about-next-note a:focus-visible {
  border-bottom-color: var(--neon);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .8fr);
    gap: 2.5rem;
    align-items: start;
  }

  .page-about .about-split .about-figure img {
    aspect-ratio: 4 / 5;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr);
    gap: 2rem;
    align-items: start;
  }

  .page-about .about-radius {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
    gap: 2.5rem;
    align-items: start;
  }

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

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

  .page-about .timeline-node {
    flex-basis: 340px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero-plate {
    padding: 4rem 4.25rem;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, .72fr);
  }
}