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

/* ---------- 首屏 ---------- */
.page-about .brand-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 48px) 0 56px;
  border-bottom: 1px solid var(--line);
}

.page-about .hero-slab {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(65% 70% at 86% 6%, rgba(230, 57, 70, 0.22), transparent 72%),
    radial-gradient(55% 65% at 8% 102%, rgba(244, 185, 66, 0.12), transparent 72%);
}

.page-about .hero-slab::after {
  content: "";
  position: absolute;
  top: -22%;
  right: -18%;
  width: min(680px, 78vw);
  aspect-ratio: 1 / 1;
  background: linear-gradient(140deg, rgba(230, 57, 70, 0.34), rgba(122, 30, 43, 0.04) 68%, transparent);
  clip-path: polygon(100% 0, 100% 100%, 0 0);
}

.page-about .hero-slab::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 88%);
}

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

.page-about .brand-hero .breadcrumb {
  margin-bottom: 28px;
}

.page-about .brand-hero .breadcrumb a {
  color: var(--smoke);
}

.page-about .brand-hero .eyebrow {
  margin-bottom: 16px;
}

.page-about .brand-hero h1 {
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: clamp(2rem, 6.6vw, 3.6rem);
  line-height: 1.08;
  margin: 0 0 22px;
  max-width: 20ch;
}

.page-about .hero-lede {
  font-family: var(--font-body);
  font-size: clamp(1rem, 2.4vw, 1.125rem);
  line-height: 1.75;
  color: var(--smoke);
  max-width: 66ch;
  margin: 0 0 40px;
}

.page-about .hero-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  max-width: 880px;
}

.page-about .hero-figures .stat {
  background: rgba(16, 24, 39, 0.86);
  padding: 18px 16px;
  min-height: 92px;
}

.page-about .hero-figures .stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 600;
  color: var(--paper);
  line-height: 1.1;
}

.page-about .hero-figures .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--smoke);
}

/* ---------- 主体网格 ---------- */
.page-about .page-grid {
  display: grid;
  gap: 40px;
  padding: 56px 0 0;
}

.page-about .anchor-rail {
  display: none;
}

.page-about .rail-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0 0 16px;
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  border-left: 1px solid var(--line);
}

.page-about .rail-link {
  display: block;
  padding: 9px 0 9px 14px;
  font-size: 0.875rem;
  color: var(--smoke);
  text-decoration: none;
  border-left: 2px solid transparent;
  margin-left: -1px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--paper);
  border-left-color: var(--flame);
}

.page-about .page-flow {
  display: grid;
  gap: clamp(52px, 8vw, 92px);
  min-width: 0;
}

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

.page-about .section-head {
  max-width: 72ch;
  margin-bottom: 32px;
}

.page-about .section-head h2 {
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.005em;
  font-size: clamp(1.5rem, 4.4vw, 2.1rem);
  line-height: 1.2;
  margin: 0 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  background-image: linear-gradient(var(--gold), var(--gold));
  background-repeat: no-repeat;
  background-size: 56px 2px;
  background-position: 0 100%;
}

.page-about .section-lede {
  font-size: 1rem;
  line-height: 1.78;
  color: var(--smoke);
  margin: 0;
}

.page-about .inline-link {
  margin: 28px 0 0;
  font-size: 0.9375rem;
  color: var(--smoke);
}

.page-about .inline-link a {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(244, 185, 66, 0.45);
  padding-bottom: 1px;
}

.page-about .inline-link a:hover,
.page-about .inline-link a:focus-visible {
  border-bottom-color: var(--gold);
}

.page-about .media-frame {
  margin: 0 0 36px;
  border: 1px solid var(--line);
  background: var(--ink-soft);
}

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

/* ---------- 时间线 ---------- */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 30px;
  display: grid;
  gap: 26px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), rgba(244, 185, 66, 0.18) 46%, rgba(61, 214, 196, 0.42));
}

.page-about .tl-node {
  position: relative;
  min-width: 0;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 7px;
  width: 13px;
  height: 13px;
  background: var(--ink);
  border: 1px solid var(--gold);
}

.page-about .tl-mark {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 8px;
}

.page-about .tl-phase {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.9375rem;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .tl-idx {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--smoke);
}

.page-about .tl-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 2px solid var(--flame);
  padding: 20px 22px;
}

.page-about .tl-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.125rem;
  line-height: 1.35;
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .tl-text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--smoke);
}

/* ---------- 团队 ---------- */
.page-about .team-layout {
  display: grid;
  gap: 28px;
}

.page-about .team-photo {
  margin: 0;
}

.page-about .trigger-name {
  display: block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.0625rem;
  color: var(--paper);
}

.page-about .trigger-hint {
  display: block;
  margin-top: 4px;
  font-size: 0.8125rem;
  color: var(--smoke);
}

.page-about .accordion-panel p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--smoke);
}

.page-about .team-note {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}

/* ---------- 版本 ---------- */
.page-about .version-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .version-card {
  background: var(--panel);
  padding: 24px 22px;
  min-width: 0;
}

.page-about .version-code {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--flame);
  border: 1px solid rgba(230, 57, 70, 0.42);
  padding: 3px 8px;
  margin-bottom: 14px;
}

.page-about .version-card h3 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.125rem;
  line-height: 1.35;
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .version-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--smoke);
}

.page-about .env-strip {
  list-style: none;
  margin: 24px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
}

.page-about .env-strip li {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--paper);
}

.page-about .env-dot {
  width: 8px;
  height: 8px;
  background: var(--jade);
  box-shadow: 0 0 10px rgba(61, 214, 196, 0.55);
}

/* ---------- 数据流程 ---------- */
.page-about .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .step {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 0;
  background: var(--panel);
}

.page-about .step-idx {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 22px 0;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--gold);
  background: rgba(244, 185, 66, 0.06);
  border-right: 1px solid var(--line);
}

.page-about .step-body {
  padding: 20px 20px 22px;
  min-width: 0;
}

.page-about .step-body h3 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.0625rem;
  margin: 0 0 8px;
  color: var(--paper);
}

.page-about .step-body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--smoke);
}

/* ---------- 生态 ---------- */
.page-about .eco-grid {
  display: grid;
  gap: 18px;
}

.page-about .eco-card {
  position: relative;
  background: var(--ink-soft);
  border: 1px solid var(--line);
  border-top: 2px solid var(--flame-dark);
  padding: 24px 22px;
  min-width: 0;
}

.page-about .eco-idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--jade);
  margin-bottom: 12px;
}

.page-about .eco-card h3 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.125rem;
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .eco-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--smoke);
}

.page-about .honor-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}

/* ---------- 页尾行动 ---------- */
.page-about .closing {
  margin-top: clamp(56px, 8vw, 96px);
  border-top: 1px solid var(--line);
  background:
    radial-gradient(80% 120% at 100% 0%, rgba(230, 57, 70, 0.16), transparent 70%),
    var(--ink-soft);
}

.page-about .closing-inner {
  padding: 48px 0 56px;
  display: grid;
  gap: 26px;
}

.page-about .closing-text h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.375rem, 3.8vw, 1.875rem);
  line-height: 1.2;
  margin: 0 0 12px;
}

.page-about .closing-text p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--smoke);
  max-width: 60ch;
}

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

.page-about .closing-actions .btn {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  text-decoration: none;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about .brand-hero {
    padding: calc(var(--header-h) + 64px) 0 72px;
  }

  .page-about .hero-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

  .page-about .step-body {
    padding: 24px 28px 26px;
  }

  .page-about .closing-inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: center;
    gap: 32px;
    padding: 56px 0 64px;
  }

  .page-about .closing-actions {
    justify-content: flex-end;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-about .page-grid {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: 52px;
    padding-top: 68px;
  }

  .page-about .anchor-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .team-photo {
    margin: 0;
  }

  .page-about .timeline {
    padding: 6px 0 6px 0;
    gap: 38px;
  }

  .page-about .timeline::before {
    left: 132px;
    top: 14px;
    bottom: 14px;
  }

  .page-about .tl-node {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 32px;
  }

  .page-about .tl-node::before {
    left: 132px;
    transform: translateX(-50%);
    top: 8px;
  }

  .page-about .tl-mark {
    flex-direction: column;
    align-items: flex-end;
    gap: 4px;
    margin: 0;
    padding-top: 4px;
  }

  .page-about .tl-card {
    padding: 24px 26px;
  }
}

.page-about .rail-link:focus-visible,
.page-about .inline-link a:focus-visible,
.page-about .closing-actions .btn:focus-visible {
  outline: 2px solid var(--jade);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rail-link {
    transition: none;
  }
}
</main>