.page-cases-featured {
  --cf-rail-width: 5em;
  --cf-frame: var(--border-thin) solid var(--color-line);
}

/* ---------- 首屏 ---------- */
.page-cases-featured .cf-intro {
  padding-block: var(--space-6) var(--space-4);
}

.page-cases-featured .cf-intro h1 {
  font-family: var(--font-heading);
  font-size: var(--text-4xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: 0 0 var(--space-3);
  max-width: 20ch;
}

.page-cases-featured .cf-lead {
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  max-width: var(--measure);
  margin: 0;
}

.page-cases-featured .cf-meta {
  margin: var(--space-6) 0 0;
  border-top: var(--cf-frame);
}

.page-cases-featured .cf-meta > div {
  display: grid;
  grid-template-columns: 6em minmax(0, 1fr);
  gap: var(--space-2);
  padding: var(--space-2) 0;
  border-bottom: var(--cf-frame);
}

.page-cases-featured .cf-meta dt {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-cases-featured .cf-meta dd {
  margin: 0;
  font-size: var(--text-base);
  color: var(--color-ink);
}

/* ---------- 为什么讲这一条 ---------- */
.page-cases-featured .cf-why-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
}

.page-cases-featured .cf-why-body p {
  margin-top: 0;
}

.page-cases-featured .cf-brief {
  padding: var(--space-3);
  background: var(--color-surface-deep);
}

.page-cases-featured .cf-brief-title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  border-bottom: var(--cf-frame);
  padding-bottom: var(--space-2);
}

.page-cases-featured .cf-brief dl {
  margin: 0;
}

.page-cases-featured .cf-brief dl > div {
  display: grid;
  grid-template-columns: 6.5em minmax(0, 1fr);
  gap: var(--space-2);
  padding: var(--space-2) 0;
  border-bottom: var(--cf-frame);
}

.page-cases-featured .cf-brief dl > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-cases-featured .cf-brief dt {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-cases-featured .cf-brief dd {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink);
  line-height: 1.5;
}

/* ---------- 环节刻度 ---------- */
.page-cases-featured .cf-scale {
  position: sticky;
  top: 0;
  z-index: 4;
  background: var(--color-surface);
  border-top: var(--cf-frame);
  border-bottom: var(--cf-frame);
}

.page-cases-featured .cf-scale-inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding-block: var(--space-2);
  overflow-x: auto;
  scrollbar-width: none;
}

.page-cases-featured .cf-scale-inner::-webkit-scrollbar {
  display: none;
}

.page-cases-featured .cf-scale-label {
  flex: none;
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

.page-cases-featured .cf-scale-list {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-cases-featured .cf-scale-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4em;
  text-decoration: none;
  white-space: nowrap;
  border-bottom: var(--border-thick) solid transparent;
  padding-bottom: 2px;
  transition: border-color 180ms ease;
}

.page-cases-featured .cf-scale-num {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-ink-muted);
  transition: color 180ms ease;
}

.page-cases-featured .cf-scale-name {
  display: none;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-cases-featured .cf-scale-list a.is-active {
  border-bottom-color: var(--color-primary);
}

.page-cases-featured .cf-scale-list a.is-active .cf-scale-num {
  color: var(--color-primary);
}

.page-cases-featured .cf-scale-list a.is-active .cf-scale-name {
  color: var(--color-ink);
}

/* ---------- 分组头 ---------- */
.page-cases-featured .cf-group-head {
  padding-bottom: var(--space-4);
  margin-bottom: var(--space-6);
  border-bottom: var(--cf-frame);
}

.page-cases-featured .cf-group-index {
  display: block;
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-1);
}

.page-cases-featured .cf-group-title {
  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);
  margin: 0 0 var(--space-2);
}

.page-cases-featured .cf-group-note {
  margin: 0;
  font-size: var(--text-base);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

/* ---------- 图片 ---------- */
.page-cases-featured .cf-figure {
  margin: 0 0 var(--space-6);
}

.page-cases-featured .cf-figure .figure-media {
  overflow: hidden;
}

.page-cases-featured .cf-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-cases-featured .cf-figure--wide {
  max-width: 100%;
}

.page-cases-featured .cf-figure--square {
  max-width: 420px;
}

.page-cases-featured .cf-figure .figure-caption {
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

/* ---------- 单个环节 ---------- */
.page-cases-featured .cf-stage {
  padding-bottom: var(--space-6);
  margin-bottom: var(--space-6);
  border-bottom: var(--cf-frame);
}

.page-cases-featured .cf-stage:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-cases-featured .cf-stage-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
}

.page-cases-featured .cf-stage-num {
  position: relative;
  display: inline-block;
  font-family: var(--font-heading);
  font-size: var(--text-4xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-ink);
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-2);
}

.page-cases-featured .cf-stage-num::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 32px;
  height: var(--border-thick);
  background: var(--color-primary);
}

.page-cases-featured .cf-stage-title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: 0;
}

.page-cases-featured .cf-stage-fields {
  margin: var(--space-3) 0 0;
  border-top: var(--cf-frame);
}

.page-cases-featured .cf-stage-fields > div {
  display: grid;
  grid-template-columns: 5em minmax(0, 1fr);
  gap: var(--space-1);
  padding: var(--space-2) 0;
  border-bottom: var(--cf-frame);
}

.page-cases-featured .cf-stage-fields > div:last-child {
  border-bottom: 0;
}

.page-cases-featured .cf-stage-fields dt {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-cases-featured .cf-stage-fields dd {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink);
  line-height: 1.5;
}

.page-cases-featured .cf-stage-body .prose p:first-child {
  margin-top: 0;
}

.page-cases-featured .cf-stage-body .cf-figure {
  margin-top: var(--space-4);
}

/* ---------- 展开组 ---------- */
.page-cases-featured .cf-stage-body .expand {
  margin-top: var(--space-4);
  border-top: var(--cf-frame);
}

.page-cases-featured .cf-stage-body .expand-trigger {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin-top: var(--space-3);
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-ink);
  letter-spacing: 0.02em;
}

.page-cases-featured .cf-stage-body .expand-trigger:hover {
  color: var(--color-accent);
}

.page-cases-featured .cf-stage-body .expand-trigger:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
}

.page-cases-featured .cf-expand-mark {
  font-size: var(--text-sm);
  color: var(--color-primary);
  transition: transform 180ms ease;
}

.page-cases-featured .cf-stage-body .expand.is-open .cf-expand-mark {
  transform: rotate(45deg);
}

.page-cases-featured .cf-stage-body .expand-panel {
  margin-top: var(--space-2);
}

.page-cases-featured .cf-criteria {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-cases-featured .cf-criteria li {
  position: relative;
  padding: var(--space-2) 0 var(--space-2) var(--space-3);
  border-bottom: var(--cf-frame);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

.page-cases-featured .cf-criteria li:last-child {
  border-bottom: 0;
}

.page-cases-featured .cf-criteria li::before {
  content: "";
  position: absolute;
  left: 0;
  top: calc(var(--space-2) + 0.62em);
  width: 8px;
  height: 8px;
  background: var(--color-primary);
}

/* ---------- 适用与不适用 ---------- */
.page-cases-featured .cf-fit {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
}

.page-cases-featured .cf-fit-col {
  border: var(--cf-frame);
  padding: var(--space-3);
}

.page-cases-featured .cf-fit-title {
  margin: 0 0 var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: var(--cf-frame);
  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-cases-featured .cf-fit-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-cases-featured .cf-fit-list li {
  padding: var(--space-2) 0;
  border-bottom: var(--cf-frame);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

.page-cases-featured .cf-fit-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-cases-featured .cf-fit-col--no .cf-fit-list li {
  color: var(--color-ink);
}

/* ---------- 相邻入口 ---------- */
.page-cases-featured .cf-next {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--cf-frame);
}

.page-cases-featured .cf-next li {
  border-bottom: var(--cf-frame);
}

.page-cases-featured .cf-next a {
  display: block;
  padding: var(--space-3) 0;
  text-decoration: none;
  color: inherit;
  transition: padding-left 180ms ease;
}

.page-cases-featured .cf-next a:hover {
  padding-left: var(--space-2);
}

.page-cases-featured .cf-next a:hover .cf-next-title {
  color: var(--color-accent);
}

.page-cases-featured .cf-next a:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: -2px;
}

.page-cases-featured .cf-next-kicker {
  display: block;
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-1);
}

.page-cases-featured .cf-next-title {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
  transition: color 180ms ease;
}

/* ---------- 反色收束 ---------- */
.page-cases-featured .contrast-block .cf-close-kicker {
  margin: 0 0 var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-contrast-accent);
}

.page-cases-featured .contrast-block .cf-close-title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
  max-width: 24ch;
}

.page-cases-featured .contrast-block .cf-close-text {
  margin: 0 0 var(--space-4);
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
}

.page-cases-featured .contrast-block .cf-close-link {
  color: var(--color-contrast-accent);
  text-decoration: underline;
}

.page-cases-featured .contrast-block .btn {
  display: inline-block;
}

/* ---------- 中等屏 ---------- */
@media (min-width: 700px) {
  .page-cases-featured .cf-meta {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--space-6);
    border-bottom: 0;
  }

  .page-cases-featured .cf-meta > div {
    border-bottom: var(--cf-frame);
  }

  .page-cases-featured .cf-fit {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-4);
  }

  .page-cases-featured .cf-scale-name {
    display: inline;
  }

  .page-cases-featured .cf-figure--square {
    max-width: 380px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-cases-featured .cf-intro {
    padding-block: var(--space-8) var(--space-6);
  }

  .page-cases-featured .cf-meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: var(--space-4);
  }

  .page-cases-featured .cf-why-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-8);
  }

  .page-cases-featured .cf-stage-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: var(--space-8);
  }

  .page-cases-featured .cf-stage-rail {
    padding-right: var(--space-4);
  }

  .page-cases-featured .cf-stage {
    padding-bottom: var(--space-8);
    margin-bottom: var(--space-8);
  }

  .page-cases-featured .cf-group-head {
    margin-bottom: var(--space-8);
  }

  .page-cases-featured .cf-next a {
    display: grid;
    grid-template-columns: minmax(0, 3fr) minmax(0, 6fr);
    gap: var(--space-4);
    align-items: baseline;
  }

  .page-cases-featured .cf-next-kicker {
    margin-bottom: 0;
  }
}