.page-certification .cert-hero {
  padding-block: calc(var(--section-y) * 0.6) var(--section-y);
}

.page-certification .cert-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-4);
}

.page-certification .cert-hero__title {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: 0;
  max-width: 12ch;
  overflow-wrap: break-word;
}

.page-certification .cert-hero__lede {
  margin-top: var(--space-4);
  max-width: 46ch;
}

.page-certification .cert-hero__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4) var(--space-3);
  margin: 0;
  align-content: end;
}

.page-certification .cert-hero__figures .stat {
  display: flex;
  flex-direction: column-reverse;
  gap: var(--space-1);
}

.page-certification .cert-hero__figures .stat__value {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  line-height: 1;
  color: var(--color-ink);
}

.page-certification .cert-hero__figures .stat__label {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  line-height: 1.4;
}

.page-certification .cert-scale {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-3);
  list-style: none;
  margin: var(--space-8) 0 0;
  padding: var(--space-3) 0 0;
  background-image: repeating-linear-gradient(
    to right,
    var(--color-line) 0,
    var(--color-line) 1px,
    transparent 1px,
    transparent 10px
  );
  background-repeat: repeat-x;
  background-size: 100% 1px;
  background-position: 0 0;
}

.page-certification .cert-scale__item {
  margin: 0;
}

.page-certification .cert-scale__link {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-primary);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: var(--border-thin) solid transparent;
  transition: color var(--dur-quick) var(--ease-out),
              border-color var(--dur-quick) var(--ease-out);
}

.page-certification .cert-scale__link:hover,
.page-certification .cert-scale__link:focus-visible {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.page-certification .cert-scale__item--a .cert-scale__link {
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-certification .cert-scale__item--b .cert-scale__link {
  font-weight: 500;
  letter-spacing: 0.10em;
}

.page-certification .cert-scale__item--c .cert-scale__link {
  font-weight: 400;
  letter-spacing: 0.20em;
}

.page-certification .cert-doc {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

.page-certification .cert-toc__head {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
  margin: 0 0 var(--space-2);
}

.page-certification .cert-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.page-certification .cert-toc__list a {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: var(--border-thin) solid transparent;
  padding-bottom: 2px;
  transition: color var(--dur-quick) var(--ease-out),
              border-color var(--dur-quick) var(--ease-out);
}

.page-certification .cert-toc__list a:hover,
.page-certification .cert-toc__list a:focus-visible {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.page-certification .cert-doc__body {
  min-width: 0;
  max-width: var(--measure);
}

.page-certification .cert-group {
  padding-block: var(--space-6) 0;
}

.page-certification .cert-group__intro {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  margin: 0;
}

.page-certification .cert-group--narrow {
  max-width: 54ch;
}

.page-certification .cert-media {
  margin: var(--space-6) 0 0;
}

.page-certification .cert-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  background-color: var(--color-surface-deep);
}

.page-certification .cert-media--tall {
  max-width: 280px;
  margin-inline: 0 auto;
}

.page-certification .cert-rule {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-1);
  padding-block: var(--space-6);
  scroll-margin-top: var(--space-6);
}

.page-certification .cert-rule__num {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  color: var(--color-primary);
  margin: 0;
  transition: color var(--dur-quick) var(--ease-out);
}

.page-certification .cert-rule:target .cert-rule__num {
  color: var(--color-accent);
}

.page-certification .cert-rule__name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
  margin: 0 0 var(--space-2);
}

.page-certification .cert-rule__scope,
.page-certification .cert-rule__std {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  margin: 0 0 var(--space-2);
}

.page-certification .cert-rule__scope {
  color: var(--color-ink-soft);
}

.page-certification .cert-rule__std {
  color: var(--color-ink);
}

.page-certification .cert-rule__std a,
.page-certification .cert-rule__scope a,
.page-certification .numlist__body a,
.page-certification .callout a,
.page-certification .cert-version__foot a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.page-certification .cert-rule__std a:hover,
.page-certification .cert-rule__scope a:hover,
.page-certification .numlist__body a:hover,
.page-certification .callout a:hover,
.page-certification .cert-version__foot a:hover {
  color: var(--color-focus);
}

/* 深色数据带 */
.page-certification .cert-band {
  margin-block: var(--space-8);
}

.page-certification .cert-band__inner {
  padding: var(--space-6) var(--space-4);
}

.page-certification .cert-band__nodes {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
  counter-reset: cert-node;
}

.page-certification .cert-band__node {
  display: grid;
  gap: var(--space-1);
}

.page-certification .cert-band__node-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.24em;
  color: var(--color-contrast-accent);
}

.page-certification .cert-band__node-name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-contrast-ink);
  line-height: var(--leading-heading);
}

.page-certification .cert-band__node-desc {
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  opacity: 0.72;
  line-height: var(--leading-body);
}

.page-certification .cert-band__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-certification .cert-band__stats .stat {
  display: flex;
  flex-direction: column-reverse;
  gap: var(--space-1);
}

.page-certification .cert-band__stats .stat__value {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  line-height: 1;
  color: var(--color-contrast-accent);
}

.page-certification .cert-band__stats .stat__label {
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  opacity: 0.78;
  line-height: 1.4;
}

/* 勘误复核 */
.page-certification .cert-errata {
  padding-block: var(--space-8) 0;
}

.page-certification .cert-errata__intro {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  margin: 0;
}

.page-certification .cert-errata__steps {
  margin: var(--space-6) 0 0;
}

.page-certification .numlist__body h3 {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
  margin: 0 0 var(--space-1);
}

.page-certification .numlist__body p {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  margin: 0;
}

.page-certification .cert-errata__note {
  margin-top: var(--space-6);
}

/* 版本与生效 */
.page-certification .cert-version {
  padding-block: var(--space-8) var(--section-y);
}

.page-certification .cert-version__intro {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  margin: 0;
}

.page-certification .cert-version__list {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
}

.page-certification .cert-version__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-1);
  padding-top: var(--space-3);
  background-image: repeating-linear-gradient(
    to right,
    var(--color-line) 0,
    var(--color-line) 1px,
    transparent 1px,
    transparent 8px
  );
  background-repeat: repeat-x;
  background-size: 100% 1px;
  background-position: 0 0;
}

.page-certification .cert-version__idx {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-primary);
}

.page-certification .cert-version__text {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
  margin: 0;
}

.page-certification .cert-version__foot {
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-muted);
  margin: var(--space-6) 0 0;
  max-width: 52ch;
}

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

  .page-certification .cert-rule {
    grid-template-columns: calc(var(--space-6) + var(--space-1)) minmax(0, 1fr);
    column-gap: var(--space-3);
  }

  .page-certification .cert-rule__num {
    padding-top: 0.35em;
  }

  .page-certification .cert-band__inner {
    padding: var(--space-8) var(--space-6);
  }

  .page-certification .cert-band__nodes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-6);
  }

  .page-certification .cert-version__item {
    grid-template-columns: 9rem minmax(0, 1fr);
    column-gap: var(--space-3);
  }

  .page-certification .cert-version__idx {
    padding-top: 0.5em;
  }
}

@media (min-width: 768px) {
  .page-certification .cert-hero {
    padding-block: var(--section-y) calc(var(--section-y) * 1.1);
  }

  .page-certification .cert-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-8);
    align-items: end;
  }

  .page-certification .cert-scale {
    gap: var(--space-3) var(--space-4);
    margin-top: var(--section-y);
  }
}

@media (min-width: 1024px) {
  .page-certification .cert-doc {
    grid-template-columns: 172px minmax(0, 1fr);
    column-gap: var(--space-8);
    align-items: start;
  }

  .page-certification .cert-doc__toc {
    position: sticky;
    top: var(--space-8);
    padding-top: var(--space-6);
  }

  .page-certification .cert-group {
    padding-block: var(--space-8) 0;
  }

  .page-certification .cert-errata {
    padding-block: var(--space-8) 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-certification .cert-scale__link,
  .page-certification .cert-toc__list a,
  .page-certification .cert-rule__num {
    transition: none;
  }
}