.page-about {
  --ab-line: rgba(58, 68, 112, 0.62);
  --ab-line-soft: rgba(58, 68, 112, 0.32);
  --ab-panel: rgba(19, 26, 56, 0.66);
  --ab-panel-solid: #131A38;
  --ab-glow: rgba(123, 92, 255, 0.2);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(1.8rem, 4vw, 3rem);
  padding-bottom: clamp(2.4rem, 5vw, 4rem);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -28%;
  right: -18%;
  width: min(640px, 92vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, var(--ab-glow) 0%, rgba(11, 16, 38, 0) 68%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.8rem, 5vw, 3.2rem);
  margin-top: clamp(1.2rem, 3vw, 2rem);
}

.page-about .hero-copy .page-title {
  margin-top: 0.6rem;
  max-width: 20ch;
}

.page-about .hero-copy .page-lede {
  max-width: 46ch;
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(1.2rem, 3vw, 1.8rem);
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line);
  border-radius: var(--radius-l);
  overflow: hidden;
  align-self: end;
}

.page-about .fact {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1.05rem 1.1rem 1.15rem;
  background: rgba(19, 26, 56, 0.86);
}

.page-about .fact .mono-sm {
  color: var(--text-faint);
  letter-spacing: 0.1em;
}

.page-about .fact strong {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--star);
  line-height: 1.35;
}

/* ---------- 由来 ---------- */

.page-about .origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.8rem, 5vw, 3.4rem);
  align-items: center;
}

.page-about .origin-copy h2 {
  margin-top: 0.6rem;
  max-width: 22ch;
}

.page-about .origin-copy p {
  max-width: 52ch;
  color: var(--silver);
}

.page-about .origin-points {
  list-style: none;
  margin: clamp(1.4rem, 3vw, 1.9rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .origin-points li {
  position: relative;
  padding-left: 1.1rem;
  border-left: 1px solid var(--ab-line);
}

.page-about .origin-points .mono-sm {
  display: block;
  color: var(--cyan);
  letter-spacing: 0.1em;
  margin-bottom: 0.3rem;
}

.page-about .origin-points p {
  margin: 0;
  max-width: 46ch;
  color: var(--text-dim);
  font-size: 0.96rem;
  line-height: 1.7;
}

.page-about .origin-figure {
  margin: 0;
  border: 1px solid var(--ab-line);
  border-radius: var(--radius-l);
  overflow: hidden;
  background: var(--ab-panel-solid);
}

.page-about .origin-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .origin-figure .media-frame__caption {
  padding: 0.85rem 1.1rem 1rem;
  border-top: 1px solid var(--ab-line-soft);
  margin: 0;
}

/* ---------- 版本轨道 ---------- */

.page-about .rail-section .section-head p {
  max-width: 58ch;
}

.page-about .rail-visual {
  margin: clamp(1.6rem, 4vw, 2.6rem) 0 0;
  border: 1px solid var(--ab-line-soft);
  border-radius: var(--radius-l);
  overflow: hidden;
  background: linear-gradient(180deg, rgba(19, 26, 56, 0.9), rgba(11, 16, 38, 0.55));
}

.page-about .rail-visual img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 7 / 3;
  object-fit: cover;
  opacity: 0.86;
}

.page-about .rail-track {
  position: relative;
  list-style: none;
  margin: clamp(2rem, 5vw, 3.2rem) 0 0;
  padding: 0;
  display: grid;
  gap: 0.2rem;
}

.page-about .rail-track::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, rgba(53, 214, 200, 0.6), rgba(58, 68, 112, 0.5) 55%, rgba(58, 68, 112, 0.14));
}

.page-about .rail-item {
  position: relative;
  padding-left: 2.2rem;
}

.page-about .rail-details {
  border: 0;
}

.page-about .rail-node {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.9rem 0 0.5rem;
  list-style: none;
  cursor: pointer;
}

.page-about .rail-node::-webkit-details-marker {
  display: none;
}

.page-about .rail-dot {
  position: absolute;
  left: -1.7rem;
  top: 1.25rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1.5px solid var(--line-700);
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .rail-details[open] .rail-dot {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 214, 200, 0.16);
}

.page-about .rail-details:focus-visible .rail-dot {
  box-shadow: 0 0 0 4px rgba(53, 214, 200, 0.3);
}

.page-about .rail-ver {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .rail-title {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.4vw, 1.35rem);
  font-weight: 700;
  letter-spacing: -0.005em;
  color: var(--star);
  line-height: 1.4;
}

.page-about .rail-body {
  padding: 0 0 1.3rem;
  border-bottom: 1px solid var(--ab-line-soft);
  animation: about-fade-in 0.32s var(--ease) both;
}

.page-about .rail-body p {
  margin: 0;
  max-width: 62ch;
  color: var(--text-dim);
  font-size: 0.97rem;
  line-height: 1.8;
}

@keyframes about-fade-in {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 六组分类 ---------- */

.page-about .cat-section .section-head p {
  max-width: 56ch;
}

.page-about .cat-list {
  list-style: none;
  margin: clamp(1.8rem, 4vw, 2.6rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line-soft);
  border-radius: var(--radius-l);
  overflow: hidden;
}

.page-about .cat-item {
  padding: 1.3rem 1.35rem 1.45rem;
  background: var(--ink-900);
  transition: background 0.28s var(--ease);
}

.page-about .cat-item:hover {
  background: rgba(11, 16, 38, 0.55);
}

.page-about .cat-code {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--text-faint);
  margin-bottom: 0.55rem;
}

.page-about .cat-item h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--star);
  letter-spacing: 0;
}

.page-about .cat-item p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.94rem;
  line-height: 1.75;
}

.page-about .cat-foot {
  margin: clamp(1.4rem, 3vw, 1.9rem) 0 0;
  max-width: 62ch;
  color: var(--text-dim);
  font-size: 0.96rem;
  line-height: 1.8;
}

/* ---------- 数据带 ---------- */

.page-about .data-section {
  padding-top: clamp(2.4rem, 5vw, 3.6rem);
  padding-bottom: clamp(2.4rem, 5vw, 3.6rem);
}

.page-about .data-head {
  margin-bottom: clamp(1.4rem, 3vw, 2rem);
}

.page-about .data-band {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--ab-line-soft);
  border-top: 1px solid var(--ab-line);
  border-bottom: 1px solid var(--ab-line);
}

.page-about .data-item {
  position: relative;
  padding: 1.5rem 1.35rem 1.6rem;
  background: var(--ab-panel-solid);
  overflow: hidden;
}

.page-about .data-item:nth-child(even) {
  background: rgba(19, 26, 56, 0.5);
}

.page-about .data-item::before {
  content: "";
  position: absolute;
  left: 1.35rem;
  top: 1.5rem;
  width: 18px;
  height: 1px;
  background: var(--nebula);
  opacity: 0.7;
}

.page-about .data-num {
  display: block;
  margin-top: 0.9rem;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4.6vw, 2.3rem);
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.1;
  color: var(--star);
}

.page-about .data-num em {
  font-style: normal;
  font-size: 0.46em;
  margin-left: 0.2em;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

.page-about .data-label {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.page-about .data-note {
  margin: 0.7rem 0 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-faint);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
}

/* ---------- 团队 ---------- */

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.8rem, 5vw, 3.2rem);
  align-items: start;
}

.page-about .team-copy h2 {
  margin-top: 0.6rem;
  max-width: 20ch;
}

.page-about .team-copy p {
  max-width: 54ch;
  color: var(--silver);
}

.page-about .team-stats {
  list-style: none;
  margin: clamp(1.3rem, 3vw, 1.8rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line-soft);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .team-stats li {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1rem 1.05rem 1.1rem;
  background: var(--ink-900);
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--star);
}

.page-about .stat-label {
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--text-faint);
  line-height: 1.5;
}

.page-about .team-link {
  margin-top: 1.3rem;
  font-size: 0.95rem;
  color: var(--text-dim);
}

.page-about .team-figure {
  margin: 0;
  border: 1px solid var(--ab-line);
  border-radius: var(--radius-l);
  overflow: hidden;
  background: var(--ab-panel-solid);
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .team-figure .media-frame__caption {
  padding: 0.85rem 1.1rem 1rem;
  border-top: 1px solid var(--ab-line-soft);
  margin: 0;
}

/* ---------- 资质 ---------- */

.page-about .cert-section .section-head p {
  max-width: 52ch;
}

.page-about .cert-list {
  list-style: none;
  margin: clamp(1.8rem, 4vw, 2.4rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .cert {
  height: 100%;
  padding: 1.4rem 1.3rem 1.5rem;
  border: 1px solid var(--ab-line);
  border-radius: var(--radius-l);
  background: rgba(19, 26, 56, 0.42);
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .cert[open] {
  border-color: rgba(53, 214, 200, 0.5);
  background: rgba(19, 26, 56, 0.68);
}

.page-about .cert-badge {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.55rem;
  list-style: none;
  cursor: pointer;
}

.page-about .cert-badge::-webkit-details-marker {
  display: none;
}

.page-about .cert-mark {
  display: block;
  width: 44px;
  height: 44px;
  color: var(--cyan);
}

.page-about .cert-mark svg {
  display: block;
  width: 100%;
  height: 100%;
}

.page-about .cert-name {
  font-family: var(--font-mono);
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--star);
}

.page-about .cert-sub {
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--text-dim);
}

.page-about .cert-body {
  margin: 1rem 0 0;
  padding-top: 0.9rem;
  border-top: 1px solid var(--ab-line-soft);
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ---------- 生态 ---------- */

.page-about .eco-section .section-head p {
  max-width: 56ch;
}

.page-about .eco-grid {
  list-style: none;
  margin: clamp(1.8rem, 4vw, 2.4rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line-soft);
  border-radius: var(--radius-l);
  overflow: hidden;
}

.page-about .eco-item {
  padding: 1.35rem 1.3rem 1.5rem;
  background: var(--ink-900);
}

.page-about .eco-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--gold);
}

.page-about .eco-item h3 {
  margin: 0.7rem 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--star);
}

.page-about .eco-item p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.93rem;
  line-height: 1.75;
}

.page-about .closing {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.2rem;
  margin-top: clamp(1.8rem, 4vw, 2.4rem);
  padding-top: clamp(1.4rem, 3vw, 1.8rem);
  border-top: 1px solid var(--ab-line-soft);
}

.page-about .closing p {
  margin: 0;
  max-width: 46ch;
  color: var(--text-dim);
  font-size: 0.96rem;
  line-height: 1.8;
}

.page-about .closing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

/* ---------- 断点 ---------- */

@media (min-width: 560px) {
  .page-about .rail-item {
    padding-left: 3rem;
  }

  .page-about .rail-dot {
    left: -2.5rem;
  }

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

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

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

@media (min-width: 860px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
  }

  .page-about .origin-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: clamp(2rem, 4vw, 3.4rem);
  }

  .page-about .cert-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.1rem;
  }

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

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

@media (min-width: 1080px) {
  .page-about .cat-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .data-band {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .data-item {
    padding: 1.6rem 1.05rem 1.7rem;
  }

  .page-about .data-item::before {
    left: 1.05rem;
  }

  .page-about .data-num {
    font-size: 1.65rem;
  }
}

@media (hover: hover) and (min-width: 860px) {
  .page-about .data-note {
    opacity: 0.35;
    transform: translateY(3px);
  }

  .page-about .data-item:hover .data-note,
  .page-about .data-item:focus-within .data-note {
    opacity: 1;
    transform: none;
  }

  .page-about .cert:hover {
    border-color: rgba(123, 92, 255, 0.55);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rail-body {
    animation: none;
  }

  .page-about .rail-dot,
  .page-about .data-note,
  .page-about .cat-item,
  .page-about .cert {
    transition: none;
  }
}