.page-start-checklist {
  display: block;
  padding-bottom: var(--section-y);
}

/* ---------- 面包屑 ---------- */
.page-start-checklist .cl-crumb {
  padding-top: var(--space-4);
  padding-bottom: var(--space-1);
}

.page-start-checklist .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: var(--text-sm);
}

.page-start-checklist .breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  color: var(--color-ink-muted);
}

.page-start-checklist .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--color-line);
  font-family: var(--font-mono);
}

.page-start-checklist .breadcrumb__link {
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-start-checklist .breadcrumb__link:hover,
.page-start-checklist .breadcrumb__link:focus-visible {
  color: var(--color-accent);
  border-bottom-color: currentColor;
}

/* ---------- 焦点 ---------- */
.page-start-checklist a:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ---------- 定位说明 ---------- */
.page-start-checklist .cl-intro__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  padding-block: var(--space-3) var(--space-6);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-start-checklist h1 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-start-checklist .cl-intro__copy .lede {
  max-width: var(--measure);
  margin: 0 0 var(--space-3);
  color: var(--color-ink-soft);
  line-height: var(--leading-body);
}

.page-start-checklist .cl-intro__copy .lede a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-start-checklist .cl-intro__copy .lede a:hover,
.page-start-checklist .cl-intro__copy .lede a:focus-visible {
  color: var(--color-focus);
}

.page-start-checklist .cl-intro__copy .muted {
  max-width: var(--measure);
  margin: 0;
  color: var(--color-ink-muted);
  font-size: var(--text-sm);
  line-height: 1.7;
}

.page-start-checklist .cl-intro__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface-deep);
  box-shadow: var(--shadow-1);
}

.page-start-checklist .cl-intro__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1200 / 520;
  object-fit: cover;
}

.page-start-checklist .cl-intro__caption {
  padding: var(--space-2) var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  background: var(--color-surface);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.6;
  color: var(--color-ink-muted);
}

/* ---------- 分组标题 ---------- */
.page-start-checklist .cl-group {
  padding-top: var(--space-8);
}

.page-start-checklist .cl-group__head {
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.page-start-checklist .cl-group__head .tag {
  justify-self: start;
}

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

.page-start-checklist .cl-group__lead {
  max-width: var(--measure);
  margin: 0;
  color: var(--color-ink-soft);
  line-height: var(--leading-body);
}

.page-start-checklist .cl-rule {
  height: 0;
  margin-bottom: var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
}

/* ---------- 组内图片 ---------- */
.page-start-checklist .cl-media {
  margin: 0 0 var(--space-6);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface-deep);
}

.page-start-checklist .cl-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 卡片列表 ---------- */
.page-start-checklist .cl-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
  counter-reset: cl;
}

.page-start-checklist .cl-card {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
  transition: box-shadow 200ms ease, transform 200ms ease, border-left-color 200ms ease;
}

.page-start-checklist .cl-card:hover,
.page-start-checklist .cl-card:focus-within {
  box-shadow: var(--shadow-2);
  transform: translateY(-2px);
  border-left-color: var(--color-accent);
}

.page-start-checklist .cl-group--cite .cl-card {
  border-left-color: var(--color-accent);
}

.page-start-checklist .cl-group--cite .cl-card:hover,
.page-start-checklist .cl-group--cite .cl-card:focus-within {
  border-left-color: var(--color-primary);
}

.page-start-checklist .cl-card__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.page-start-checklist .cl-card__num {
  flex: none;
  display: inline-block;
  padding: 2px var(--space-1);
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1.6;
}

.page-start-checklist .cl-group--cite .cl-card__num {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-start-checklist .cl-card__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-start-checklist .cl-card__desc {
  margin: 0 0 var(--space-2);
  max-width: var(--measure);
  color: var(--color-ink);
  line-height: var(--leading-body);
}

.page-start-checklist .cl-card__src {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-start-checklist .cl-card__src a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-start-checklist .cl-card__src a:hover,
.page-start-checklist .cl-card__src a:focus-visible {
  color: var(--color-focus);
}

/* 卡片旁注 */
.page-start-checklist .cl-card__aside {
  display: grid;
  gap: var(--space-3);
  align-content: start;
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-start-checklist .cl-card__field {
  display: grid;
  gap: 4px;
}

.page-start-checklist .cl-card__key {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-start-checklist .cl-card__val {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

/* ---------- 适用边界（深色区） ---------- */
.page-start-checklist .cl-fit {
  margin-top: var(--space-8);
}

.page-start-checklist .cl-fit__head {
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.page-start-checklist .cl-fit__eyebrow {
  color: var(--color-contrast-accent);
}

.page-start-checklist .cl-fit__head h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-contrast-ink);
}

.page-start-checklist .cl-fit__lead {
  max-width: var(--measure);
  margin: 0;
  color: var(--color-contrast-ink);
  line-height: var(--leading-body);
}

.page-start-checklist .cl-fit__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.page-start-checklist .cl-fit__col {
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-start-checklist .cl-fit__col--alt {
  padding-left: 0;
}

.page-start-checklist .cl-fit__col-label {
  display: inline-block;
  margin: 0 0 var(--space-3);
  padding: 2px var(--space-1);
  border-radius: var(--radius-sm);
  background: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
  font-size: var(--text-xs);
  font-weight: 600;
  line-height: 1.7;
}

.page-start-checklist .cl-fit__col--alt .cl-fit__col-label {
  background: transparent;
  border: var(--border-thin) solid var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

.page-start-checklist .cl-fit__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--space-2);
}

.page-start-checklist .cl-fit__list li {
  position: relative;
  padding-left: var(--space-3);
  color: var(--color-contrast-ink);
  line-height: var(--leading-body);
}

.page-start-checklist .cl-fit__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 10px;
  height: 1px;
  background: var(--color-contrast-accent);
}

.page-start-checklist .cl-fit__col--alt .cl-fit__list li::before {
  background: var(--color-contrast-line);
}

.page-start-checklist .cl-fit__list a {
  color: var(--color-contrast-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--color-contrast-accent);
}

.page-start-checklist .cl-fit__list a:hover,
.page-start-checklist .cl-fit__list a:focus-visible {
  color: var(--color-contrast-accent);
}

/* ---------- 相邻入口 ---------- */
.page-start-checklist .cl-next {
  padding-top: var(--space-8);
}

.page-start-checklist .cl-next__head {
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.page-start-checklist .cl-next__head h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-start-checklist .cl-next__lead {
  max-width: var(--measure);
  margin: 0;
  color: var(--color-ink-soft);
  line-height: var(--leading-body);
}

.page-start-checklist .cl-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

.page-start-checklist .cl-next__item {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-4);
  background: var(--color-primary-soft);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: box-shadow 180ms ease, transform 180ms ease, background-color 180ms ease;
}

.page-start-checklist .cl-next__item:hover,
.page-start-checklist .cl-next__item:focus-visible {
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
  background: var(--color-highlight);
}

.page-start-checklist .cl-next__idx {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-accent);
}

.page-start-checklist .cl-next__label {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-start-checklist .cl-next__desc {
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-start-checklist .cl-fit__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-8);
  }

  .page-start-checklist .cl-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-start-checklist .cl-next__item--wide {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-start-checklist .cl-intro__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: var(--space-8);
    align-items: center;
  }

  .page-start-checklist .cl-card {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: var(--space-6);
    padding: var(--space-6);
  }

  .page-start-checklist .cl-card:nth-child(even) {
    margin-left: var(--space-8);
  }

  .page-start-checklist .cl-card__aside {
    padding-top: 0;
    padding-left: var(--space-4);
    border-top: 0;
    border-left: var(--border-thin) solid var(--color-line);
  }

  .page-start-checklist .cl-media {
    max-width: 620px;
  }

  .page-start-checklist .cl-media--offset {
    margin-left: auto;
  }

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

  .page-start-checklist .cl-next__item--wide {
    grid-column: span 3;
    grid-template-columns: auto auto minmax(0, 1fr);
    align-items: baseline;
    gap: var(--space-3);
  }
}

@media (min-width: 1100px) {
  .page-start-checklist .cl-card {
    grid-template-columns: minmax(0, 1fr) 300px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-start-checklist .cl-card,
  .page-start-checklist .cl-next__item {
    transition: none;
  }

  .page-start-checklist .cl-card:hover,
  .page-start-checklist .cl-card:focus-within,
  .page-start-checklist .cl-next__item:hover,
  .page-start-checklist .cl-next__item:focus-visible {
    transform: none;
  }
}