.page-certification {
  --cert-no-col: calc(var(--space-8) - var(--space-1));
  --cert-rail-w: calc(var(--space-8) * 3 + var(--space-1));
  background: var(--color-surface);
}

.page-certification [id^="chap-"] {
  scroll-margin-top: 120px;
}

/* ---------- 首屏 ---------- */

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

.page-certification .cert-hero .crumb {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  align-items: center;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-certification .cert-hero .crumb a {
  color: var(--color-primary);
  text-decoration: none;
}

.page-certification .cert-hero .crumb a:hover,
.page-certification .cert-hero .crumb a:focus-visible {
  text-decoration: underline;
}

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

.page-certification .cert-hero__lede {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.page-certification .cert-hero h1 {
  margin: var(--space-2) 0 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  font-stretch: condensed;
}

.page-certification .cert-hero__lede-text {
  margin: var(--space-3) 0 0;
  max-width: 46ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-certification .cert-toc {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  column-gap: var(--space-4);
}

.page-certification .cert-toc a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-2);
  align-items: baseline;
  padding-block: var(--space-1);
  color: var(--color-ink);
  font-size: var(--text-sm);
  line-height: 1.5;
  text-decoration: none;
  transition: color 160ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

.page-certification .cert-toc a:hover .cert-toc__label,
.page-certification .cert-toc a:focus-visible .cert-toc__label {
  color: var(--color-primary);
}

.page-certification .cert-toc__no {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-primary);
}

.page-certification .cert-toc__label {
  min-width: 0;
}

/* 首屏深底视觉面板 */

.page-certification .cert-hero__visual {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  min-height: 380px;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-certification .cert-hero__visual img {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-certification .cert-hero__visual::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--overlay-scrim);
}

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

.page-certification .cert-matrix span {
  display: block;
  padding-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.06em;
  color: var(--color-contrast-ink);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-certification .cert-figs {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: var(--space-3) var(--space-4);
  margin-top: auto;
}

.page-certification .cert-fig {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.page-certification .cert-fig__num {
  font-family: var(--font-mono);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-contrast-accent);
}

.page-certification .cert-fig--lg .cert-fig__num {
  font-size: var(--text-figure);
}

.page-certification .cert-fig--md .cert-fig__num {
  font-size: var(--text-3xl);
}

.page-certification .cert-fig--sm .cert-fig__num {
  font-size: var(--text-xl);
}

.page-certification .cert-fig__cap {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-contrast-ink);
  opacity: 0.78;
}

.page-certification .cert-icp {
  margin: 0;
  padding-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-contrast-ink);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

/* ---------- 结构总览 ---------- */

.page-certification .cert-overview {
  padding-block: var(--section-y);
  background: var(--color-surface-alt);
}

.page-certification .cert-overview__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
  align-items: start;
}

.page-certification .cert-overview h2 {
  margin: var(--space-2) 0 0;
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-certification .cert-overview__text p {
  margin: var(--space-3) 0 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-certification .cert-overview__figure {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--color-contrast-surface);
}

.page-certification .cert-overview__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.page-certification .cert-overview__figure figcaption {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
  line-height: 1.6;
  color: var(--color-contrast-ink);
  background: var(--color-contrast-surface);
}

/* ---------- 长文档主体 ---------- */

.page-certification .cert-doc {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  padding-block: var(--section-y);
  align-items: start;
}

.page-certification .cert-doc__body {
  min-width: 0;
}

.page-certification .cert-group {
  padding-block: var(--space-4);
}

.page-certification .cert-group--alt {
  background: var(--color-surface-alt);
  border-radius: var(--radius-md);
  padding-inline: var(--space-2);
  margin-inline: calc(-1 * var(--space-2));
}

.page-certification .cert-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-3);
}

.page-certification .cert-group__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-primary);
}

.page-certification .cert-group__head h2 {
  margin: 0;
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-certification .cert-group__desc {
  flex-basis: 100%;
  margin: var(--space-1) 0 0;
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* 章节条目 */

.page-certification .cert-chap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2);
  margin-top: var(--space-6);
}

.page-certification .cert-chap__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--color-primary);
}

.page-certification .cert-chap__content {
  min-width: 0;
}

.page-certification .cert-chap__content h3 {
  margin: 0;
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-certification .cert-chap__scope {
  margin: var(--space-1) 0 0;
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}

.page-certification .cert-chap__text {
  margin: var(--space-2) 0 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-certification .cert-points {
  list-style: none;
  margin: var(--space-3) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-1);
}

.page-certification .cert-points li {
  position: relative;
  padding-left: var(--space-3);
  max-width: var(--measure);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-certification .cert-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: calc(var(--space-2) - var(--space-1));
  height: var(--border-thin);
  background: var(--color-primary);
}

.page-certification .cert-chap__action {
  margin: var(--space-3) 0 0;
  margin-left: var(--space-2);
  max-width: var(--measure);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--color-highlight);
  color: var(--color-ink);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
}

.page-certification .cert-chap__action-tag {
  display: inline-block;
  margin-right: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-accent);
}

.page-certification .cert-chap__action a,
.page-certification .cert-checklist__note a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-certification .cert-note {
  margin: var(--space-3) 0 0;
  max-width: var(--measure);
}

.page-certification .cert-note summary {
  display: inline-block;
  cursor: pointer;
  list-style: none;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-pill);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  transition: background 160ms cubic-bezier(0.22, 0.61, 0.36, 1), color 160ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

.page-certification .cert-note summary::-webkit-details-marker {
  display: none;
}

.page-certification .cert-note summary:hover,
.page-certification .cert-note summary:focus-visible {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-certification .cert-note[open] summary {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-certification .cert-note p {
  margin: var(--space-2) 0 0;
  padding-left: var(--space-3);
  border-left: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-certification .cert-inline-figure {
  margin: var(--space-3) 0 0;
  max-width: var(--measure);
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--color-contrast-surface);
}

.page-certification .cert-inline-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-certification .cert-inline-figure figcaption {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
  line-height: 1.6;
  color: var(--color-contrast-ink);
  background: var(--color-contrast-surface);
}

/* 侧边章节目录 */

.page-certification .cert-rail {
  min-width: 0;
  order: -1;
}

.page-certification .cert-rail__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}

.page-certification .cert-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 var(--space-1);
  display: flex;
  gap: var(--space-1);
  overflow-x: auto;
}

.page-certification .cert-rail__list a {
  display: flex;
  gap: var(--space-1);
  align-items: baseline;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-pill);
  background: var(--color-primary-soft);
  color: var(--color-ink-soft);
  font-size: var(--text-xs);
  line-height: 1.5;
  white-space: nowrap;
  text-decoration: none;
  transition: background 160ms cubic-bezier(0.22, 0.61, 0.36, 1), color 160ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

.page-certification .cert-rail__list a:hover,
.page-certification .cert-rail__list a:focus-visible {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-certification .cert-rail__no {
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  color: var(--color-primary);
}

.page-certification .cert-rail__list a:hover .cert-rail__no,
.page-certification .cert-rail__list a:focus-visible .cert-rail__no {
  color: var(--color-accent-ink);
}

/* ---------- 变更记录（深底时间线） ---------- */

.page-certification .cert-log {
  padding-block: var(--section-y-lg);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-certification .cert-log .eyebrow {
  color: var(--color-contrast-accent);
}

.page-certification .cert-log h2 {
  margin: var(--space-2) 0 0;
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-contrast-ink);
}

.page-certification .cert-log__intro {
  margin: var(--space-3) 0 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
  opacity: 0.84;
}

.page-certification .cert-timeline {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
}

.page-certification .cert-timeline__item {
  position: relative;
  padding: 0 0 var(--space-4) var(--space-4);
  margin-left: calc(var(--space-1) / 2);
  border-left: var(--border-thin) solid var(--color-contrast-line);
}

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

.page-certification .cert-timeline__mark {
  position: absolute;
  left: calc(-1 * var(--space-1) / 2 - var(--border-thin) / 2);
  top: 0.5em;
  width: var(--space-1);
  height: var(--space-1);
  border-radius: var(--radius-pill);
  background: var(--color-contrast-accent);
}

.page-certification .cert-timeline__batch {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-contrast-accent);
}

.page-certification .cert-timeline__desc {
  margin: var(--space-1) 0 0;
  max-width: 62ch;
  font-size: var(--text-base);
  line-height: 1.78;
  color: var(--color-contrast-ink);
  opacity: 0.86;
}

/* 已进入视口的节点做一次性点亮 */

.page-certification .cert-timeline[data-reveal="shown"] .cert-timeline__mark {
  animation: cert-pulse 400ms cubic-bezier(0.22, 0.61, 0.36, 1) both;
}

@keyframes cert-pulse {
  0% {
    transform: scale(0.6);
    opacity: 0.2;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

/* ---------- 自查清单 ---------- */

.page-certification .cert-checklist {
  padding-block: var(--section-y);
  background: var(--color-surface);
}

.page-certification .cert-checklist h2 {
  margin: var(--space-2) 0 0;
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-certification .cert-checklist__intro {
  margin: var(--space-3) 0 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

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

.page-certification .cert-checklist__col {
  min-width: 0;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-surface-alt);
}

.page-certification .cert-checklist__col h3 {
  margin: 0;
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-certification .cert-checks {
  list-style: none;
  counter-reset: cert-check;
  margin: var(--space-3) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.page-certification .cert-checks li {
  position: relative;
  counter-increment: cert-check;
  padding-left: var(--space-4);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-certification .cert-checks li::before {
  content: counter(cert-check, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.25em;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-primary);
}

.page-certification .cert-checklist__note {
  margin: var(--space-4) 0 0;
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-certification .cert-toc {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-certification .cert-hero__visual {
    min-height: 420px;
  }

  .page-certification .cert-chap {
    grid-template-columns: var(--cert-no-col) minmax(0, 1fr);
    column-gap: var(--space-3);
    row-gap: 0;
  }

  .page-certification .cert-chap__no {
    grid-column: 1;
  }

  .page-certification .cert-chap__content {
    grid-column: 2;
  }

  .page-certification .cert-checklist__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-6);
  }
}

@media (min-width: 900px) {
  .page-certification .cert-hero__split {
    grid-template-columns: 7fr 5fr;
    gap: var(--space-6);
  }

  .page-certification .cert-overview__grid {
    grid-template-columns: 6fr 6fr;
    gap: var(--space-6);
    align-items: center;
  }
}

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

  .page-certification .cert-rail {
    order: 0;
    position: sticky;
    top: 104px;
  }

  .page-certification .cert-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-certification .cert-rail__list a {
    padding: var(--space-1) 0;
    border-radius: var(--radius-sm);
    background: transparent;
    white-space: normal;
  }

  .page-certification .cert-rail__list a:hover,
  .page-certification .cert-rail__list a:focus-visible {
    background: var(--color-primary-soft);
    color: var(--color-ink);
  }

  .page-certification .cert-rail__list a:hover .cert-rail__no,
  .page-certification .cert-rail__list a:focus-visible .cert-rail__no {
    color: var(--color-accent);
  }

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

  .page-certification .cert-timeline__item {
    padding-left: var(--space-6);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-certification .cert-timeline[data-reveal="shown"] .cert-timeline__mark {
    animation: none;
  }

  .page-certification .cert-toc a,
  .page-certification .cert-note summary,
  .page-certification .cert-rail__list a {
    transition: none;
  }
}