.page-about {
  --p-line: rgba(0, 180, 216, 0.28);
  --p-line-soft: rgba(0, 180, 216, 0.12);
  --p-panel: #0f2547;
  --p-panel-deep: #0b1d3a;
  --p-ink: #f2efe6;
  --p-dim: #a8c6d8;
  --p-gap: 56px;
}

/* ---------- 页面容器与节奏 ---------- */
.page-about .about-page-stack {
  display: grid;
  gap: var(--p-gap);
  margin-top: 28px;
  padding-bottom: 96px;
}

.page-about .breadcrumbs {
  margin-top: 24px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: end;
  padding: 12px 0 8px;
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-weight: 300;
  font-size: clamp(2rem, 7.4vw, 4.25rem);
  line-height: 1.08;
  letter-spacing: 0.01em;
  color: var(--p-ink);
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin-top: 20px;
  max-width: 46em;
  color: var(--p-dim);
  font-size: 1rem;
  line-height: 1.8;
}

.page-about .about-hero__media {
  border-radius: 36px;
  overflow: hidden;
  border: 1px solid var(--p-line);
  background: var(--p-panel-deep);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- 数据条 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 32px 0 0;
  background: var(--p-line);
  border: 1px solid var(--p-line);
  border-radius: 28px;
  overflow: hidden;
}

.page-about .about-stats__cell {
  margin: 0;
  padding: 18px 18px 20px;
  background: var(--p-panel-deep);
}

.page-about .about-stats__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--p-dim);
}

.page-about .about-stats__value {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  color: var(--aqua);
}

/* ---------- 章节导航 ---------- */
.page-about .about-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  padding: 18px 0;
  border-top: 1px solid var(--p-line-soft);
  border-bottom: 1px solid var(--p-line-soft);
}

.page-about .about-toc .toc__link {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--p-line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--p-dim);
  text-decoration: none;
  transition: color 0.2s var(--ease-out), border-color 0.2s var(--ease-out), background 0.2s var(--ease-out);
}

.page-about .about-toc .toc__link:hover,
.page-about .about-toc .toc__link:focus-visible,
.page-about .about-toc .toc__link[aria-current] {
  color: #061223;
  background: var(--aqua);
  border-color: var(--aqua);
}

/* ---------- 通用面板 ---------- */
.page-about .about-panel {
  position: relative;
  padding: 36px 22px;
  border: 1px solid var(--p-line);
  border-radius: 36px;
  background: var(--p-panel);
  overflow: hidden;
}

.page-about .about-panel::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 245, 212, 0.5), transparent);
  opacity: 0.7;
}

.page-about .about-panel--radius-a { border-radius: 28px; }
.page-about .about-panel--radius-c { border-radius: 48px; }

.page-about .about-panel--moss {
  background: linear-gradient(160deg, #16233a 0%, #1b2f33 55%, #22352f 100%);
}

.page-about .about-panel--light {
  background: var(--sand, #fbf8f1);
  border-color: rgba(11, 29, 58, 0.12);
  color: #0b1d3a;
}

.page-about .about-panel--light::after {
  background: linear-gradient(90deg, transparent, rgba(0, 180, 216, 0.55), transparent);
}

.page-about .about-panel--light .section-title,
.page-about .about-panel--light .about-versions__prose p {
  color: #0b1d3a;
}

.page-about .about-panel--light .eyebrow {
  color: #4c6355;
}

.page-about .about-panel__head {
  max-width: 60ch;
}

.page-about .about-panel__head .section-title {
  margin: 10px 0 0;
  font-weight: 300;
  font-size: clamp(1.5rem, 4.4vw, 2.4rem);
  line-height: 1.22;
  letter-spacing: 0.01em;
  color: var(--p-ink);
}

.page-about .about-panel__intro {
  margin: 14px 0 0;
  color: var(--p-dim);
  font-size: 0.95rem;
  line-height: 1.8;
}

.page-about .about-panel__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 28px;
}

.page-about .prose p {
  margin: 0 0 16px;
  color: var(--p-dim);
  font-size: 0.97rem;
  line-height: 1.85;
}

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

.page-about .about-panel--light .prose p {
  color: #22303f;
}

/* ---------- 要点列表 ---------- */
.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-facts__item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 18px;
  border: 1px solid var(--p-line-soft);
  background: rgba(0, 180, 216, 0.05);
  color: var(--p-dim);
  font-size: 0.9rem;
  line-height: 1.6;
}

.page-about .about-facts__num {
  flex: 0 0 auto;
  font-size: 1.1rem;
  color: var(--aqua);
  letter-spacing: 0.04em;
}

/* ---------- 三条工作线 ---------- */
.page-about .about-lines {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

.page-about .about-line__rule {
  display: block;
  height: 4px;
  border-radius: 999px;
  margin-bottom: 16px;
}

.page-about .about-line--a .about-line__rule {
  width: 52%;
  background: var(--water);
}

.page-about .about-line--b .about-line__rule {
  width: 74%;
  background: linear-gradient(90deg, var(--water), var(--aqua));
}

.page-about .about-line--c .about-line__rule {
  width: 96%;
  background: linear-gradient(90deg, var(--water), var(--coral));
}

.page-about .about-line__title {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--p-ink);
  letter-spacing: 0.02em;
}

.page-about .about-line__desc {
  margin: 10px 0 0;
  color: var(--p-dim);
  font-size: 0.92rem;
  line-height: 1.8;
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 30px;
}

.page-about .about-flow__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 44px;
  position: relative;
}

.page-about .about-flow__list::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--water) 0%, var(--aqua) 45%, rgba(0, 180, 216, 0.06) 100%);
}

.page-about .about-flow__step {
  position: relative;
  padding-bottom: 30px;
}

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

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  left: -38px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #0b1d3a;
  border: 2px solid var(--water);
  transition: background 0.25s var(--ease-out), border-color 0.25s var(--ease-out);
}

.page-about .about-flow__step:hover::before,
.page-about .about-flow__step:focus-within::before {
  background: var(--aqua);
  border-color: var(--aqua);
}

.page-about .about-flow__no {
  display: block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--aqua);
}

.page-about .about-flow__title {
  margin: 4px 0 0;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--p-ink);
}

.page-about .about-flow__note {
  margin: 8px 0 0;
  max-width: 46ch;
  color: var(--p-dim);
  font-size: 0.9rem;
  line-height: 1.78;
}

.page-about .about-flow__media {
  border-radius: 28px;
  overflow: hidden;
  border: 1px solid var(--p-line);
  background: rgba(6, 18, 35, 0.5);
}

.page-about .about-flow__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

/* ---------- 协作 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 26px;
}

.page-about .about-partners__media {
  border-radius: 28px;
  overflow: hidden;
  border: 1px solid var(--p-line);
  background: rgba(6, 18, 35, 0.5);
}

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

.page-about .about-partners__body .prose {
  margin-bottom: 18px;
}

.page-about .about-partners__list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-partners__list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 12px 14px;
  border-radius: 16px;
  background: rgba(0, 180, 216, 0.05);
  border: 1px solid var(--p-line-soft);
  color: var(--p-dim);
  font-size: 0.9rem;
  line-height: 1.7;
}

.page-about .about-partners__tag {
  flex: 0 0 auto;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--clay);
  color: #1a1008;
  font-size: 11px;
  letter-spacing: 0.1em;
  line-height: 1.7;
}

.page-about .about-partners__note {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--water);
  color: var(--p-ink);
  font-size: 0.9rem;
  line-height: 1.75;
}

/* ---------- 版本 ---------- */
.page-about .about-versions {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 26px;
}

.page-about .about-versions__prose p {
  color: #22303f;
}

.page-about .about-versions__track {
  list-style: none;
  margin: 0;
  padding: 0 0 0 20px;
  border-left: 2px solid rgba(11, 29, 58, 0.16);
  display: grid;
  gap: 18px;
}

.page-about .about-versions__node {
  position: relative;
  display: grid;
  gap: 4px;
  color: #22303f;
  font-size: 0.9rem;
  line-height: 1.6;
}

.page-about .about-versions__node .mono {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: #c1512a;
}

.page-about .about-versions__node::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 7px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--sand, #fbf8f1);
  border: 2px solid var(--water);
}

/* ---------- 可检验 ---------- */
.page-about .about-verify {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-verify__item {
  padding: 22px 18px;
  border-radius: 24px;
  border: 1px solid var(--p-line-soft);
  background: rgba(0, 180, 216, 0.045);
}

.page-about .about-verify__no {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--coral);
}

.page-about .about-verify__title {
  margin: 8px 0 0;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--p-ink);
}

.page-about .about-verify__desc {
  margin: 8px 0 0;
  color: var(--p-dim);
  font-size: 0.9rem;
  line-height: 1.78;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: 36px 22px 40px;
  border-radius: 48px;
  background: var(--sand, #fbf8f1);
  color: #0b1d3a;
  border: 1px solid rgba(11, 29, 58, 0.1);
}

.page-about .about-next__title {
  margin: 0;
  font-weight: 300;
  font-size: clamp(1.5rem, 4.4vw, 2.35rem);
  line-height: 1.22;
  color: #0b1d3a;
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-next__card {
  display: grid;
  gap: 6px;
  padding: 20px 18px;
  border-radius: 24px;
  border: 1px solid rgba(11, 29, 58, 0.14);
  background: #ffffff;
  text-decoration: none;
  color: inherit;
  transition: transform 0.25s var(--ease-out), border-color 0.25s var(--ease-out), box-shadow 0.25s var(--ease-out);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--water);
  box-shadow: 0 14px 30px rgba(11, 29, 58, 0.12);
}

.page-about .about-next__kicker {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: #c1512a;
}

.page-about .about-next__name {
  font-size: 1.08rem;
  font-weight: 600;
  color: #0b1d3a;
}

.page-about .about-next__desc {
  font-size: 0.88rem;
  line-height: 1.7;
  color: #46566a;
}

.page-about .about-next__foot {
  margin: 26px 0 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: #46566a;
}

.page-about .about-next__foot a {
  color: #0077a3;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-next__foot a:hover,
.page-about .about-next__foot a:focus-visible {
  color: #c1512a;
}

/* ---------- 焦点可见性 ---------- */
.page-about a:focus-visible,
.page-about [tabindex]:focus-visible {
  outline: 2px solid var(--water);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 720px) {
  .page-about .about-page-stack {
    --p-gap: 64px;
  }

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

  .page-about .about-panel {
    padding: 48px 40px;
  }

  .page-about .about-flow__list {
    padding-left: 56px;
  }

  .page-about .about-flow__list::before {
    left: 13px;
  }

  .page-about .about-flow__step::before {
    left: -48px;
  }

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

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

  .page-about .about-next {
    padding: 48px 40px 52px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1000px) {
  .page-about .about-page-stack {
    --p-gap: 88px;
  }

  .page-about .about-hero {
    grid-template-columns: 7fr 5fr;
    gap: 56px;
  }

  .page-about .about-panel__grid {
    grid-template-columns: 7fr 5fr;
    gap: 44px;
  }

  .page-about .about-lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 32px;
  }

  .page-about .about-flow {
    grid-template-columns: 7fr 5fr;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-partners {
    grid-template-columns: 6fr 6fr;
    gap: 40px;
    align-items: start;
  }

  .page-about .about-versions {
    grid-template-columns: 7fr 5fr;
    gap: 48px;
  }

  .page-about .about-panel--offset-r {
    margin-left: 6%;
  }

  .page-about .about-panel--offset-l {
    margin-right: 6%;
  }

  .page-about .about-verify {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-next__card,
  .page-about .about-toc .toc__link {
    transition: none;
  }

  .page-about .about-next__card:hover,
  .page-about .about-next__card:focus-visible {
    transform: none;
  }
}