.page-about {
  --about-line: rgba(154, 164, 196, 0.24);
  --about-line-ink: rgba(20, 22, 28, 0.14);
  --about-card: #16224a;
  background: var(--deep);
  overflow-x: clip;
}

/* 面包屑 */
.page-about .about-crumb {
  padding-top: clamp(1.25rem, 4vw, 2.25rem);
  padding-bottom: 0.25rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-bottom: clamp(3rem, 7vw, 5rem);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(2rem, 5vw, 3.25rem);
  align-items: start;
}

.page-about .about-hero__coord {
  margin-left: calc(var(--gutter) * -1);
  padding: 0.2rem 0 0.2rem var(--gutter);
  border-left: 2px solid var(--orange);
  font-size: var(--fs-xs);
  letter-spacing: 0.18em;
  color: var(--obs);
}

.page-about .about-hero__title {
  margin: 1.15rem 0 0;
  font-size: clamp(2.05rem, 8.5vw, 3.55rem);
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--starlight);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--violet);
  position: relative;
}

.page-about .about-hero__title em::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.12em;
  height: 2px;
  background: linear-gradient(90deg, var(--violet), transparent);
}

.page-about .about-hero__lead {
  margin: 1.5rem 0 0;
  max-width: 46ch;
  font-size: var(--fs-md);
  line-height: 1.85;
  color: var(--obs);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

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

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(2.5rem, 6vw, 4rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero__stats li {
  background: var(--deep);
  padding: 1.05rem 1.1rem 1.2rem;
}

.page-about .about-hero__num {
  display: block;
  font-size: var(--fs-xl);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--starlight);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__num small {
  font-size: var(--fs-sm);
  font-weight: 400;
  margin-left: 0.15em;
  color: var(--obs);
}

.page-about .about-hero__label {
  display: block;
  margin-top: 0.35rem;
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  color: var(--obs);
}

/* ---------- 区块通用 ---------- */
.page-about .about-band {
  padding: clamp(3rem, 8vw, 6rem) 0;
}

.page-about .band--paper {
  background: var(--paper);
  color: var(--ink);
}

.page-about .band--nebula {
  background: var(--nebula);
}

.page-about .section-head__title {
  font-size: clamp(1.6rem, 4.4vw, 2.35rem);
  line-height: 1.26;
  letter-spacing: 0.02em;
}

.page-about .band--paper .section-head__index {
  color: var(--violet);
}

.page-about .band--paper .section-head__title {
  color: var(--ink);
}

.page-about .band--paper .section-head__lead {
  color: var(--ink-soft);
}

.page-about .band--paper a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--violet);
  text-underline-offset: 0.22em;
}

.page-about .band--paper a:hover {
  color: var(--violet);
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .about-origin__text p {
  margin: 0;
  max-width: 46ch;
  line-height: 1.85;
  color: var(--obs);
}

.page-about .about-origin__text p + p {
  margin-top: 1.1rem;
}

.page-about .about-origin__aside-title {
  margin: 0 0 0.75rem;
  font-size: var(--fs-xs);
  letter-spacing: 0.2em;
  color: var(--violet);
}

.page-about .pillars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .pillar {
  background: var(--nebula);
  padding: 1.1rem 1.15rem 1.3rem;
  transition: background 0.2s var(--ease);
}

.page-about .pillar:hover {
  background: var(--orbit);
}

.page-about .pillar__idx {
  margin: 0;
  font-size: var(--fs-xs);
  letter-spacing: 0.24em;
  color: var(--violet);
}

.page-about .pillar h3 {
  margin: 0.45rem 0 0;
  font-size: var(--fs-md);
  color: var(--starlight);
}

.page-about .pillar p:last-child {
  margin: 0.5rem 0 0;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--obs);
}

/* ---------- 使用场景 ---------- */
.page-about .scene-grid {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .scene-grid__figure {
  margin: 0;
  border: 1px solid var(--about-line-ink);
  overflow: hidden;
}

.page-about .scene-grid__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 11 / 7;
  object-fit: cover;
}

.page-about .scene-grid__figure .figure__caption {
  padding: 0.7rem 0.9rem;
  font-size: var(--fs-xs);
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .scene-list {
  display: grid;
}

.page-about .scene {
  position: relative;
  padding: 1.4rem 0 1.5rem;
  border-top: 1px solid var(--about-line-ink);
}

.page-about .scene:first-child {
  border-top: none;
  padding-top: 0.4rem;
}

.page-about .scene::before {
  content: "";
  position: absolute;
  left: -0.85rem;
  top: 1.5rem;
  bottom: 1.6rem;
  width: 2px;
  background: var(--violet);
  opacity: 0;
  transition: opacity 0.2s var(--ease);
}

.page-about .scene:first-child::before {
  top: 0.5rem;
}

.page-about .scene:hover::before {
  opacity: 1;
}

.page-about .scene__label {
  margin: 0;
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  color: var(--violet);
}

.page-about .scene h3 {
  margin: 0.45rem 0 0.6rem;
  font-size: var(--fs-md);
  color: var(--ink);
}

.page-about .scene p:last-child {
  margin: 0;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 团队 ---------- */
.page-about .teams {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  display: grid;
  gap: 1.1rem;
}

.page-about .team {
  border: 1px solid var(--about-line);
  background: var(--nebula);
  padding: 1.15rem 1.15rem 1.35rem;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .team:hover,
.page-about .team:focus-within {
  border-color: var(--pulse);
  background: var(--about-card);
}

.page-about .team__bar {
  display: block;
  height: 5px;
  background: var(--orbit);
  transition: background 0.2s var(--ease);
}

.page-about .team--a .team__bar {
  width: 100%;
}

.page-about .team--b .team__bar {
  width: 75%;
}

.page-about .team--c .team__bar {
  width: 50%;
}

.page-about .team:hover .team__bar,
.page-about .team:focus-within .team__bar {
  background: var(--pulse);
}

.page-about .team__count {
  margin: 0.9rem 0 0;
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  color: var(--obs);
}

.page-about .team__name {
  margin: 0.3rem 0 0;
  font-size: var(--fs-md);
  color: var(--starlight);
}

.page-about .team__desc {
  margin: 0.6rem 0 0;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--obs);
}

.page-about .team__duty {
  margin: 0;
  font-size: var(--fs-xs);
  line-height: 1.75;
  color: var(--pulse);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.28s var(--ease), opacity 0.22s var(--ease),
    margin-top 0.28s var(--ease);
}

.page-about .team:hover .team__duty,
.page-about .team:focus-within .team__duty {
  max-height: 8rem;
  opacity: 1;
  margin-top: 0.8rem;
}

.page-about .about-lab {
  margin: clamp(2.25rem, 5vw, 3.25rem) 0 0;
  border: 1px solid var(--about-line);
  overflow: hidden;
}

.page-about .about-lab img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 4;
  object-fit: cover;
}

.page-about .about-lab .figure__caption {
  padding: 0.85rem 1rem 0.95rem;
  font-size: var(--fs-xs);
  line-height: 1.75;
  color: var(--obs);
  border-top: 1px solid var(--about-line);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 0;
}

.page-about .timeline__item {
  position: relative;
  padding-left: 2.2rem;
  margin-bottom: 0.9rem;
}

.page-about .timeline__item:nth-child(2) {
  margin-left: 0.9rem;
}

.page-about .timeline__item:nth-child(3) {
  margin-left: 1.8rem;
}

.page-about .timeline__item:nth-child(4) {
  margin-left: 2.7rem;
}

.page-about .timeline__item:nth-child(5) {
  margin-left: 3.6rem;
  margin-bottom: 0;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.6rem;
  width: 1.4rem;
  height: 1px;
  background: var(--orbit);
}

.page-about .timeline__item::after {
  content: "";
  position: absolute;
  left: 1.3rem;
  top: calc(1.6rem - 3px);
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--violet);
}

.page-about .timeline__body {
  background: var(--deep);
  border: 1px solid var(--about-line);
  padding: 1rem 1.15rem 1.15rem;
  transition: border-color 0.2s var(--ease);
}

.page-about .timeline__item:hover .timeline__body,
.page-about .timeline__item:focus-within .timeline__body {
  border-color: var(--violet);
}

.page-about .timeline__idx {
  margin: 0;
  font-size: var(--fs-xs);
  letter-spacing: 0.22em;
  color: var(--violet);
}

.page-about .timeline__title {
  margin: 0.35rem 0 0.55rem;
  font-size: var(--fs-md);
  color: var(--starlight);
}

.page-about .timeline__text {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: var(--obs);
}

.page-about .timeline__note {
  margin: 0;
  font-size: var(--fs-xs);
  line-height: 1.75;
  color: var(--pulse);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.3s var(--ease), opacity 0.22s var(--ease),
    margin-top 0.3s var(--ease);
}

.page-about .timeline__item:hover .timeline__note,
.page-about .timeline__item:focus-within .timeline__note {
  max-height: 8rem;
  opacity: 1;
  margin-top: 0.7rem;
}

/* ---------- 协作生态 ---------- */
.page-about .eco {
  list-style: none;
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .eco__item {
  display: grid;
  grid-template-columns: 3.2rem minmax(0, 1fr);
  gap: 0 1rem;
  align-items: start;
  padding: 1.2rem 0.6rem 1.3rem;
  border-bottom: 1px solid var(--about-line);
  transition: background 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.page-about .eco__item:hover {
  background: var(--about-card);
  padding-left: 1.2rem;
}

.page-about .eco__glyph {
  position: relative;
  display: block;
  width: 1.5rem;
  height: 1.5rem;
  border: 1px solid var(--violet);
  margin-top: 0.15rem;
}

.page-about .eco__glyph::before,
.page-about .eco__glyph::after {
  content: "";
  position: absolute;
  background: var(--violet);
}

.page-about .eco__glyph::before {
  left: 50%;
  top: 22%;
  bottom: 22%;
  width: 1px;
  transform: translateX(-50%);
}

.page-about .eco__glyph::after {
  top: 50%;
  left: 22%;
  right: 22%;
  height: 1px;
  transform: translateY(-50%);
}

.page-about .eco__code {
  margin: 0;
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  color: var(--obs);
}

.page-about .eco__name {
  margin: 0.3rem 0 0;
  font-size: var(--fs-md);
  color: var(--starlight);
}

.page-about .eco__text {
  margin: 0.5rem 0 0;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--obs);
}

/* ---------- 服务承诺 ---------- */
.page-about .promise {
  list-style: none;
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .promise__item {
  border-top: 1px solid var(--about-line-ink);
  padding: 1.3rem 1rem 1.45rem;
  transition: background 0.2s var(--ease);
}

.page-about .promise__item:hover {
  background: var(--orange);
}

.page-about .promise__key {
  margin: 0;
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  color: var(--ink-soft);
  transition: color 0.2s var(--ease);
}

.page-about .promise__val {
  margin: 0.35rem 0 0;
  font-size: var(--fs-lg);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--violet);
  font-variant-numeric: tabular-nums;
  transition: color 0.2s var(--ease);
}

.page-about .promise__desc {
  margin: 0.6rem 0 0;
  max-width: 44ch;
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: var(--ink-soft);
  transition: color 0.2s var(--ease);
}

.page-about .promise__item:hover .promise__key,
.page-about .promise__item:hover .promise__val,
.page-about .promise__item:hover .promise__desc {
  color: var(--ink);
}

.page-about .promise__item:hover a {
  color: var(--ink);
  text-decoration-color: var(--ink);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  position: relative;
  padding: clamp(3rem, 8vw, 5.5rem) 0;
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(139, 92, 246, 0.22), transparent 60%),
    radial-gradient(90% 80% at 100% 100%, rgba(53, 224, 208, 0.14), transparent 55%),
    var(--deep);
  border-top: 1px solid var(--about-line);
}

.page-about .about-cta__kicker {
  margin: 0;
  font-size: var(--fs-xs);
  letter-spacing: 0.24em;
  color: var(--pulse);
}

.page-about .about-cta__title {
  margin: 0.7rem 0 0;
  font-size: clamp(1.6rem, 4.6vw, 2.4rem);
  line-height: 1.26;
  letter-spacing: 0.02em;
  color: var(--starlight);
}

.page-about .about-cta__text {
  margin: 1.1rem 0 0;
  max-width: 48ch;
  line-height: 1.85;
  color: var(--obs);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.9rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.8fr);
  }

  .page-about .about-hero__figure img {
    aspect-ratio: 9 / 13;
  }

  .page-about .scene-grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: start;
  }

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

@media (max-width: 767px) {
  .page-about .timeline__item:nth-child(n) {
    margin-left: 0;
  }
}

@media (hover: none) {
  .page-about .team__duty {
    max-height: 9rem;
    opacity: 1;
    margin-top: 0.8rem;
  }

  .page-about .timeline__note {
    max-height: 9rem;
    opacity: 1;
    margin-top: 0.7rem;
  }

  .page-about .scene::before {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .pillar,
  .page-about .team,
  .page-about .team__bar,
  .page-about .team__duty,
  .page-about .timeline__body,
  .page-about .timeline__note,
  .page-about .eco__item,
  .page-about .promise__item,
  .page-about .promise__key,
  .page-about .promise__val,
  .page-about .promise__desc,
  .page-about .scene::before {
    transition: none;
  }
}