.page-about {
  --about-rail-w: 32%;
  --about-gap: clamp(28px, 4vw, 56px);
  background: var(--c-deep);
  color: var(--c-paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 56px) 0 clamp(40px, 6vw, 72px);
  background:
    radial-gradient(120% 90% at 82% 0%, rgba(53, 214, 227, .14), transparent 58%),
    linear-gradient(180deg, var(--c-deep) 0%, #0A1F35 100%);
  border-bottom: 1px solid var(--c-line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 18px;
  border: 1px solid rgba(28, 61, 92, .8);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  pointer-events: none;
}

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

.page-about .breadcrumb__link {
  color: var(--c-muted);
  text-decoration: none;
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--c-cyan);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .about-hero__eyebrow {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-cyan);
  margin: 0 0 14px;
}

.page-about .about-hero__title {
  font-size: clamp(30px, 6vw, 56px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  color: var(--c-paper);
}

.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: 96px;
  height: 3px;
  margin-top: 18px;
  background: linear-gradient(90deg, var(--c-cyan), rgba(53, 214, 227, 0));
}

.page-about .about-hero__desc {
  font-size: 16px;
  line-height: 1.8;
  color: #C3D4E2;
  max-width: 38em;
  margin: 0 0 26px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  align-content: start;
}

.page-about .fact-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 16px 18px;
  background: rgba(15, 42, 68, .72);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .fact-card__num {
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 700;
  color: var(--c-gold-soft);
  background: rgba(227, 178, 79, .12);
  padding: 2px 6px;
  align-self: flex-start;
}

.page-about .fact-card__num em {
  font-style: normal;
  font-size: .6em;
  color: var(--c-gold);
  margin-left: 2px;
}

.page-about .fact-card__label {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-paper);
}

.page-about .fact-card__note {
  font-size: 12px;
  line-height: 1.6;
  color: var(--c-muted);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  padding: clamp(40px, 6vw, 80px) 0 clamp(56px, 8vw, 96px);
}

.page-about .about-main {
  display: flex;
  flex-direction: column;
  gap: clamp(48px, 7vw, 88px);
  min-width: 0;
}

/* ---------- 左栏索引 ---------- */
.page-about .about-rail {
  position: relative;
}

.page-about .rail-index__link {
  text-decoration: none;
  color: var(--c-muted);
}

.page-about .rail-index__link:hover,
.page-about .rail-index__link:focus-visible {
  color: var(--c-cyan);
}

.page-about .rail-index__link[aria-current="location"] {
  color: var(--c-cyan);
  border-left-color: var(--c-cyan);
}

.page-about .rail-note {
  margin-top: 26px;
  padding: 16px 14px;
  border-left: 2px solid var(--c-gold);
  background: rgba(227, 178, 79, .07);
}

.page-about .rail-note__label {
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--c-dim);
  margin: 0 0 4px;
}

.page-about .rail-note__value {
  font-size: 14px;
  color: var(--c-paper);
  margin: 0 0 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.page-about .rail-note__value:last-child {
  margin-bottom: 0;
}

.page-about .rail-note__value a {
  color: var(--c-paper);
  text-decoration: none;
}

.page-about .rail-note__value a:hover,
.page-about .rail-note__value a:focus-visible {
  color: var(--c-cyan);
}

.page-about .rail-note .copy-btn {
  border: 1px solid var(--c-line);
  background: transparent;
  color: var(--c-muted);
  font-size: 11px;
  padding: 3px 8px;
  cursor: pointer;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.page-about .rail-note .copy-btn:hover,
.page-about .rail-note .copy-btn:focus-visible {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  scroll-margin-top: 120px;
}

.page-about .about-sec--data {
  position: relative;
  padding: clamp(26px, 4vw, 44px) clamp(18px, 3vw, 32px);
  background: linear-gradient(160deg, rgba(15, 42, 68, .92), rgba(8, 25, 43, .6));
  border: 1px solid var(--c-line);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-about .about-sec__head {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-sec__eyebrow {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-cyan);
  margin: 0 0 10px;
}

.page-about .about-sec__title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--c-paper);
}

.page-about .about-sec__rule {
  flex: none;
  width: 34px;
  height: 2px;
  background: var(--c-cyan);
}

.page-about .about-sec__lead {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-muted);
  max-width: 40em;
}

.page-about .about-sec__body + .about-sec__body {
  margin-top: 14px;
}

.page-about .prose p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.8;
  color: #C3D4E2;
  max-width: 38em;
}

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

/* ---------- 场景卡 ---------- */
.page-about .scene-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .scene-card {
  padding: 18px 16px 20px;
  background: rgba(15, 42, 68, .6);
  border-top: 1px solid var(--c-line);
  border-left: 1px solid var(--c-line);
  border-right: 1px solid var(--c-line);
  border-bottom: 2px solid var(--c-line);
  transition: border-color .16s var(--ease), transform .16s var(--ease);
}

.page-about .scene-card:hover {
  border-bottom-color: var(--c-cyan);
  transform: translateY(-2px);
}

.page-about .scene-card__tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--c-cyan-soft);
  border: 1px solid rgba(142, 233, 240, .4);
  padding: 2px 8px;
  margin: 0 0 12px;
}

.page-about .scene-card__title {
  font-size: 17px;
  margin: 0 0 8px;
  color: var(--c-paper);
  letter-spacing: -0.01em;
}

.page-about .scene-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-muted);
}

/* ---------- 时间线 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(24px, 3vw, 36px);
}

.page-about .about-figure .figure__frame {
  border: 1px solid var(--c-line);
  background: #061525;
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  border-left: 1px solid var(--c-line);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 32px) 18px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 6px;
  width: 9px;
  height: 9px;
  background: var(--c-deep);
  border: 2px solid var(--c-cyan);
  transform: rotate(45deg);
}

.page-about .timeline__item--now::before {
  background: var(--c-flare);
  border-color: var(--c-flare);
}

.page-about .timeline__year {
  display: inline-block;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--c-ink);
  background: var(--c-gold-soft);
  padding: 2px 9px;
  margin-bottom: 10px;
}

.page-about .timeline__item--now .timeline__year {
  background: var(--c-gold);
}

.page-about .timeline__title {
  font-size: 17px;
  line-height: 1.4;
  margin: 0 0 8px;
  color: var(--c-paper);
  letter-spacing: -0.01em;
}

.page-about .timeline__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-muted);
  max-width: 36em;
}

/* ---------- 团队 ---------- */
.page-about .team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
  align-items: start;
}

.page-about .team-layout__figure .figure {
  margin: 0;
}

.page-about .team-layout__figure .figure__frame {
  border: 1px solid var(--c-line);
  background: #061525;
}

.page-about .team-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(24px, 3vw, 36px);
}

.page-about .team-card {
  padding: 18px 16px;
  border: 1px solid var(--c-line);
  background: rgba(8, 25, 43, .6);
  border-top: 2px solid var(--c-cyan);
}

.page-about .team-card__index {
  font-size: 13px;
  color: var(--c-cyan-soft);
  margin: 0 0 8px;
}

.page-about .team-card__title {
  font-size: 17px;
  margin: 0 0 8px;
  color: var(--c-paper);
}

.page-about .team-card__text {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-about .team-card__meta {
  margin: 0;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--c-gold-soft);
  border-top: 1px dashed var(--c-line);
  padding-top: 10px;
}

/* ---------- 内容体系 ---------- */
.page-about .content-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 36px);
  align-items: start;
}

.page-about .content-layout__figure .figure {
  margin: 0;
}

.page-about .content-layout__figure .figure__frame {
  border: 1px solid var(--c-line);
  background: #061525;
}

.page-about .topic-list {
  margin: 0 0 18px;
  padding: 0;
}

.page-about .topic-list__row {
  padding: 14px 0;
  border-bottom: 1px dashed var(--c-line);
}

.page-about .topic-list__row:first-child {
  border-top: 1px dashed var(--c-line);
}

.page-about .topic-list__term {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 600;
  color: var(--c-paper);
  margin: 0 0 6px;
}

.page-about .topic-list__dot {
  flex: none;
  width: 8px;
  height: 8px;
  background: var(--c-cyan);
  transform: rotate(45deg);
}

.page-about .topic-list__desc {
  margin: 0 0 0 18px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-about .content-layout__note {
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-muted);
  margin: 0 0 18px;
  padding-left: 14px;
  border-left: 2px solid var(--c-cyan);
}

/* ---------- 协作生态 ---------- */
.page-about .eco-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .eco-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--c-line);
}

.page-about .eco-list__item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--c-line);
}

.page-about .eco-list__num {
  flex: none;
  min-width: 74px;
  font-size: 22px;
  font-weight: 700;
  color: var(--c-ink);
  background: var(--c-gold-soft);
  text-align: center;
  padding: 4px 8px;
}

.page-about .eco-list__text {
  font-size: 14px;
  line-height: 1.7;
  color: #C3D4E2;
}

/* ---------- 备案信息 ---------- */
.page-about .license-panel {
  padding: clamp(20px, 3vw, 30px);
  background: rgba(15, 42, 68, .72);
  border: 1px solid var(--c-line);
}

.page-about .license-list {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.page-about .license-list__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 13px 0;
  border-bottom: 1px solid rgba(28, 61, 92, .75);
}

.page-about .license-list__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .license-list__label {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-dim);
}

.page-about .license-list__value {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-paper);
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  word-break: break-word;
}

.page-about .license-list__value a {
  color: var(--c-paper);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 214, 227, .45);
}

.page-about .license-list__value a:hover,
.page-about .license-list__value a:focus-visible {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}

.page-about .license-list__value .mono {
  color: var(--c-gold-soft);
}

.page-about .license-panel .copy-btn {
  border: 1px solid var(--c-line);
  background: transparent;
  color: var(--c-muted);
  font-size: 11px;
  padding: 3px 8px;
  cursor: pointer;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.page-about .license-panel .copy-btn:hover,
.page-about .license-panel .copy-btn:focus-visible {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
}

.page-about .license-panel__note {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px dashed var(--c-line);
  font-size: 13px;
  line-height: 1.8;
  color: var(--c-muted);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(24px, 3vw, 36px);
  padding: clamp(22px, 3vw, 32px);
  background: linear-gradient(120deg, rgba(53, 214, 227, .12), rgba(8, 25, 43, .2) 62%);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-flare);
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-cta__title {
  font-size: clamp(18px, 2.6vw, 22px);
  margin: 0 0 8px;
  color: var(--c-paper);
  letter-spacing: -0.02em;
}

.page-about .about-cta__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: #C3D4E2;
  max-width: 34em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

/* ---------- 图片通用 ---------- */
.page-about .figure__img,
.page-about .figure__frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

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

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

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

  .page-about .license-list__row {
    grid-template-columns: 160px 1fr;
    align-items: center;
    gap: 16px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .split {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-gap);
  }

  .page-about .about-rail {
    position: sticky;
    top: 108px;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  }

  .page-about .content-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  }

  .page-about .content-layout__figure {
    position: sticky;
    top: 108px;
  }

  .page-about .eco-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1180px) {
  .page-about .scene-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 动效 ---------- */
.js .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}

.js .page-about [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

.js .page-about [data-reveal-group] > [data-reveal]:nth-child(2) { transition-delay: .09s; }
.js .page-about [data-reveal-group] > [data-reveal]:nth-child(3) { transition-delay: .18s; }
.js .page-about [data-reveal-group] > [data-reveal]:nth-child(4) { transition-delay: .27s; }

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

  .js .page-about [data-reveal] {
    opacity: 1;
    transform: none;
  }
}