.page-cases {
  --cases-hair: calc(var(--border-thick) * 2);
}

/* ---------- 首屏 ---------- */
.page-cases .cases-hero {
  padding-block: var(--space-3) var(--space-8);
  background: var(--color-surface);
}

.page-cases .cases-hero .breadcrumb {
  margin-bottom: var(--space-4);
}

.page-cases .cases-hero-grid {
  display: grid;
  gap: var(--space-6);
}

.page-cases .cases-hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.page-cases .cases-hero-meta-text {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  letter-spacing: 0.08em;
}

.page-cases .cases-hero .display-title {
  margin: 0 0 var(--space-3);
  font-size: var(--text-display);
  line-height: 1.05;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

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

.page-cases .cases-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
  margin: var(--space-4) 0 0;
  padding: 0;
}

.page-cases .cases-stat {
  background: var(--color-primary-soft);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-2);
}

.page-cases .cases-stat-num {
  display: block;
  font-size: var(--text-3xl);
  line-height: 1.05;
  color: var(--color-primary);
}

.page-cases .cases-stat-label {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  line-height: 1.5;
  color: var(--color-ink-muted);
}

.page-cases .cases-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.page-cases .cases-hero-visual {
  margin: 0;
}

.page-cases .cases-hero-visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
}

/* ---------- 通用章节头 ---------- */
.page-cases .section-head {
  display: grid;
  gap: var(--space-2);
}

.page-cases .section-num {
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--color-primary);
}

.page-cases .section-title {
  margin: 0;
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-cases .section-sub {
  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);
}

/* ---------- 矩阵总览 ---------- */
.page-cases .cases-overview {
  padding-block: var(--space-8);
  background: var(--color-surface-alt);
}

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

.page-cases .cases-quad {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-height: 190px;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  transition: transform 200ms ease-out, background-color 200ms ease-out;
}

.page-cases .cases-quad--1 {
  background: var(--color-primary-soft);
}

.page-cases .cases-quad--2 {
  background: var(--color-highlight);
}

.page-cases .cases-quad--3 {
  background: var(--color-surface-deep);
}

.page-cases .cases-quad--4 {
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
}

.page-cases .cases-quad:hover {
  transform: translateY(-2px);
}

.page-cases .cases-quad-num {
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

.page-cases .cases-quad-title {
  margin: 0;
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-cases .cases-quad-desc {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-cases .cases-quad-meta {
  margin: auto 0 0;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  letter-spacing: 0.06em;
}

/* ---------- 场景分组 ---------- */
.page-cases .cases-group {
  padding-block: var(--space-8);
  background: var(--color-surface);
}

.page-cases .cases-group--alt {
  background: var(--color-surface-alt);
}

.page-cases .cases-group-head {
  display: grid;
  gap: var(--space-2);
}

.page-cases .cases-group-title {
  margin: 0;
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-cases .cases-group-sub {
  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);
}

.page-cases .cases-group-count {
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-cases .scene-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2);
  margin-top: var(--space-4);
}

/* ---------- 场景卡片 ---------- */
.page-cases .scene-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
  transition: transform 200ms ease-out, box-shadow 200ms ease-out, background-color 200ms ease-out;
}

.page-cases .scene-card:hover,
.page-cases .scene-card:focus-within {
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
  background: var(--color-primary-soft);
}

.page-cases .scene-card-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.page-cases .copy-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0;
  background: none;
  border: 0;
  cursor: pointer;
  font: inherit;
  color: var(--color-ink-soft);
}

.page-cases .copy-btn-num {
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--color-primary);
}

.page-cases .copy-btn-hint {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  opacity: 0;
  transition: opacity 180ms ease-out;
}

.page-cases .copy-btn:hover .copy-btn-hint,
.page-cases .copy-btn:focus-visible .copy-btn-hint {
  opacity: 1;
}

.page-cases .copy-btn:focus-visible {
  outline: var(--cases-hair) solid var(--color-focus);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.page-cases .scene-card-figure {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--color-surface-deep);
}

.page-cases .scene-card-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.page-cases .scene-card-figure--square img {
  aspect-ratio: 4 / 5;
}

.page-cases .scene-card-title {
  margin: 0;
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-cases .scene-fields {
  display: grid;
  gap: var(--space-2);
  margin: 0;
}

.page-cases .scene-field {
  display: grid;
  gap: calc(var(--space-1) / 2);
}

.page-cases .scene-field dt {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

.page-cases .scene-field dd {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-cases .scene-status {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin: auto 0 0;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

/* ---------- 可核对指标 ---------- */
.page-cases .cases-metrics {
  padding-block: var(--space-8);
  background: var(--color-surface);
}

.page-cases .cases-metrics-panel {
  margin-top: var(--space-4);
  padding: var(--space-4) var(--space-3);
  background: var(--color-highlight);
  border-radius: var(--radius-lg);
}

.page-cases .cases-metrics-dl {
  margin: 0;
}

.page-cases .cases-metric-row {
  display: grid;
  gap: calc(var(--space-1) / 2);
  padding-block: var(--space-3);
  border-top: var(--border-thin) solid color-mix(in srgb, var(--color-ink) 14%, transparent);
}

.page-cases .cases-metric-row:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-cases .cases-metric-row:last-child {
  padding-bottom: 0;
}

.page-cases .cases-metric-row dt {
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-cases .cases-metric-row dd {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-cases .cases-metric-row dd .mono {
  color: var(--color-primary);
}

/* ---------- 编号指向 ---------- */
.page-cases .cases-links {
  padding-block: var(--space-8) var(--section-y);
  background: var(--color-surface-alt);
}

.page-cases .cases-prefixes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.page-cases .cases-prefix {
  padding: var(--space-3);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
}

.page-cases .cases-prefix-code {
  display: inline-block;
  padding: calc(var(--space-1) / 2) var(--space-2);
  font-size: var(--text-base);
  letter-spacing: 0.1em;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-radius: var(--radius-pill);
}

.page-cases .cases-prefix-title {
  margin: var(--space-2) 0 var(--space-1);
  font-size: var(--text-base);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-cases .cases-prefix-desc {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-cases .cases-links-note {
  margin-top: var(--space-4);
  padding: var(--space-3);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  border-left: var(--cases-hair) solid var(--color-primary);
}

.page-cases .cases-links-note p {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-cases .cases-links-note a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-cases .cases-links-note a:hover,
.page-cases .cases-links-note a:focus-visible {
  color: var(--color-accent);
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-cases .section-head {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: baseline;
    gap: var(--space-4);
  }

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

  .page-cases .cases-group-head {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: baseline;
    gap: var(--space-4);
  }

  .page-cases .cases-group-count {
    grid-column: 2;
    text-align: left;
  }

  .page-cases .cases-metric-row {
    grid-template-columns: minmax(0, 220px) minmax(0, 1fr);
    align-items: baseline;
    gap: var(--space-4);
  }

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

  .page-cases .cases-metrics-panel {
    padding: var(--space-6) var(--space-4);
  }
}

/* ---------- 桌面：错层栅格 ---------- */
@media (min-width: 900px) {
  .page-cases .cases-hero {
    padding-block: var(--space-4) var(--section-y);
  }

  .page-cases .cases-hero-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: center;
    gap: var(--space-8);
  }

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

  .page-cases .cases-overview,
  .page-cases .cases-group,
  .page-cases .cases-metrics {
    padding-block: var(--section-y);
  }

  .page-cases .cases-links {
    padding-block: var(--section-y);
  }
}

@media (min-width: 860px) {
  .page-cases .scene-layout {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: var(--space-2);
  }

  .page-cases .scene-layout--a > .scene-card:nth-child(1) { grid-column: span 7; }
  .page-cases .scene-layout--a > .scene-card:nth-child(2) { grid-column: span 5; }
  .page-cases .scene-layout--a > .scene-card:nth-child(3) { grid-column: span 12; }

  .page-cases .scene-layout--b > .scene-card:nth-child(1) { grid-column: span 4; }
  .page-cases .scene-layout--b > .scene-card:nth-child(2) { grid-column: span 8; }
  .page-cases .scene-layout--b > .scene-card:nth-child(3) { grid-column: span 12; }

  .page-cases .scene-layout--c > .scene-card:nth-child(1) { grid-column: span 8; }
  .page-cases .scene-layout--c > .scene-card:nth-child(2) { grid-column: span 4; }
  .page-cases .scene-layout--c > .scene-card:nth-child(3) { grid-column: span 12; }

  .page-cases .scene-layout--d > .scene-card:nth-child(1) { grid-column: span 12; }
  .page-cases .scene-layout--d > .scene-card:nth-child(2) { grid-column: span 7; }
  .page-cases .scene-layout--d > .scene-card:nth-child(3) { grid-column: span 5; }

  .page-cases .scene-card--row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.9fr);
    grid-template-areas:
      "top top"
      "title fields";
    column-gap: var(--space-6);
    row-gap: var(--space-2);
  }

  .page-cases .scene-card--row .scene-card-top { grid-area: top; }
  .page-cases .scene-card--row .scene-card-title {
    grid-area: title;
    align-self: start;
    max-width: 24ch;
  }
  .page-cases .scene-card--row .scene-fields {
    grid-area: fields;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-cases .scene-card--row .scene-status {
    grid-area: unset;
    grid-column: 1 / -1;
  }
}

@media (min-width: 1000px) {
  .page-cases .cases-prefixes {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-cases .scene-card,
  .page-cases .cases-quad,
  .page-cases .copy-btn-hint {
    transition: none;
  }
  .page-cases .scene-card:hover,
  .page-cases .scene-card:focus-within,
  .page-cases .cases-quad:hover {
    transform: none;
  }
}