.page-about {
  display: block;
  padding-bottom: clamp(48px, 9vw, 104px);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(18px, 4vw, 40px);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding: clamp(18px, 3.5vw, 34px) 0 clamp(30px, 6vw, 64px);
}

.page-about .about-hero__frame {
  position: relative;
  border: 2px solid var(--c-rule);
  background:
    linear-gradient(155deg, rgba(41, 224, 214, 0.13), rgba(6, 22, 38, 0) 55%),
    linear-gradient(180deg, var(--c-panel), var(--c-abyss));
  box-shadow: var(--shadow-hard);
  padding: clamp(22px, 4vw, 56px);
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border: 2px solid var(--c-cyan);
}

.page-about .about-hero__frame::before {
  top: -2px;
  left: -2px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero__frame::after {
  right: -2px;
  bottom: -2px;
  border-top: 0;
  border-left: 0;
}

.page-about .about-hero__kicker {
  margin: 0 0 clamp(14px, 2.4vw, 24px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 5.6vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--c-mist);
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.6vw, 26px) 0 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-grey);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin: clamp(24px, 4vw, 42px) 0 0;
  padding-top: clamp(18px, 3vw, 28px);
  border-top: 1px solid var(--c-rule);
}

.page-about .about-hero__stats div {
  min-width: 0;
}

.page-about .about-hero__stats dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-grey);
}

.page-about .about-hero__stats dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.1;
  color: var(--c-mist);
}

.page-about .about-hero__stats div:first-child dd {
  color: var(--c-coral);
}

/* ---------- 图版与栅格 ---------- */
.page-about .about-plate {
  padding-top: clamp(34px, 6vw, 74px);
  padding-bottom: clamp(34px, 6vw, 74px);
}

.page-about .about-band {
  display: grid;
  gap: clamp(24px, 4vw, 34px);
}

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

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

.page-about .plate__lede {
  max-width: 62ch;
}

.page-about .prose {
  max-width: 68ch;
}

.page-about .prose p {
  margin: 0 0 1.1em;
  color: var(--c-mist);
}

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

.page-about .about-aside__note {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--c-rule);
  font-size: 13px;
  line-height: 1.65;
  color: var(--c-grey);
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about .about-wide {
  margin: clamp(20px, 3.4vw, 34px) 0 clamp(24px, 4vw, 38px);
}

/* ---------- 原则清单 ---------- */
.page-about .about-principles {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 2.6vw, 26px);
}

.page-about .about-principle {
  position: relative;
  border: 2px solid var(--c-rule);
  background: var(--c-panel);
  box-shadow: var(--shadow-hard);
  padding: clamp(18px, 2.8vw, 28px) clamp(20px, 3vw, 32px);
  padding-left: clamp(24px, 3.4vw, 38px);
}

.page-about .about-principle::before {
  content: "";
  position: absolute;
  top: -2px;
  bottom: -2px;
  left: -2px;
  width: 4px;
  background: var(--c-rule);
  transition: background-color 0.22s ease;
}

.page-about .about-principle:hover::before,
.page-about .about-principle:focus-within::before {
  background: var(--c-cyan);
}

.page-about .about-principle h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(18px, 2.2vw, 22px);
  letter-spacing: -0.01em;
  color: var(--c-mist);
}

.page-about .about-principle p {
  margin: 0;
  max-width: 62ch;
  color: var(--c-mist);
  line-height: 1.7;
}

.page-about .about-principle__counter {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--c-rule);
  font-size: 13px;
  line-height: 1.65;
  color: var(--c-grey);
}

.page-about .about-principle__counter strong {
  margin-right: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-coral-soft);
}

/* ---------- 分工表 ---------- */
.page-about .about-roles {
  width: 100%;
  min-width: 660px;
  margin-top: clamp(20px, 3vw, 30px);
  font-size: 14px;
}

.page-about .about-roles th[scope="row"] {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
  white-space: nowrap;
}

/* ---------- 版本轴 ---------- */
.page-about .about-versions {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .about-versions a {
  display: block;
  position: relative;
  padding-top: 18px;
  border-top: 2px solid var(--c-rule);
  text-decoration: none;
  color: inherit;
}

.page-about .about-versions a::after {
  content: "";
  position: absolute;
  top: -6px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-teal);
  transition: background-color 0.22s ease, transform 0.22s ease;
}

.page-about .about-versions a:hover::after,
.page-about .about-versions a:focus-visible::after {
  background: var(--c-cyan);
  transform: scale(1.25);
}

.page-about .about-version__code {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
}

.page-about .about-version__name {
  display: block;
  margin-top: 6px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 17px;
  color: var(--c-mist);
}

.page-about .about-version__desc {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-grey);
}

.page-about .about-version__details {
  display: grid;
  gap: 16px;
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .about-version__detail {
  scroll-margin-top: 96px;
  border: 2px solid var(--c-rule);
  background: var(--c-panel);
  padding: clamp(18px, 2.6vw, 26px);
  transition: border-color 0.22s ease, box-shadow 0.22s ease;
}

.page-about .about-version__detail:target {
  border-color: var(--c-coral);
  box-shadow: var(--shadow-hard);
}

.page-about .about-version__detail h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 17px;
  color: var(--c-mist);
}

.page-about .about-version__detail p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--c-mist);
}

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

.page-about .about-version__meta--current {
  color: var(--c-cyan);
}

/* ---------- 收尾 ---------- */
.page-about .about-outro {
  padding-top: clamp(10px, 2vw, 24px);
}

.page-about .about-cta {
  border: 2px solid var(--c-rule);
  background:
    linear-gradient(120deg, rgba(255, 107, 74, 0.12), rgba(6, 22, 38, 0) 58%),
    var(--c-panel);
  box-shadow: var(--shadow-hard);
  padding: clamp(24px, 4vw, 48px);
}

.page-about .about-cta__kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-coral);
}

.page-about .about-cta h2 {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 38px);
  letter-spacing: -0.02em;
  color: var(--c-mist);
}

.page-about .about-cta > p {
  max-width: 62ch;
  margin: 0 0 18px;
  color: var(--c-mist);
  line-height: 1.72;
}

.page-about .about-cta__links {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta__note {
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid var(--c-rule);
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-grey);
}

.page-about .about-cta__note a {
  color: var(--c-cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-versions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 24px;
  }

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

@media (min-width: 960px) {
  .page-about .about-band {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: 40px;
    row-gap: 36px;
  }

  .page-about .about-band__main {
    grid-column: 1 / span 8;
  }

  .page-about .about-band__aside {
    grid-column: 9 / span 4;
  }

  .page-about .about-band--flip .about-band__aside {
    grid-column: 1 / span 4;
  }

  .page-about .about-band--flip .about-band__main {
    grid-column: 5 / span 8;
  }

  .page-about .about-band--full .about-band__main {
    grid-column: 1 / span 12;
  }

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-principle::before,
  .page-about .about-versions a::after,
  .page-about .about-version__detail {
    transition: none;
  }
}