.page-cases {
  --cases-card-pad: var(--space-4);
  --cases-radius: var(--radius-lg);
}

/* ===== 首屏 ===== */
.page-cases .cases-hero {
  padding-block: var(--space-4) var(--space-8);
}

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

.page-cases .cases-hero-title {
  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);
  max-width: 11em;
}

.page-cases .cases-hero-lead .lede {
  margin-top: var(--space-3);
  max-width: 46ch;
}

.page-cases .cases-hero-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.page-cases .cases-figure {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-2) 0 0;
}

.page-cases .cases-figure-value {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}

.page-cases .cases-figure-label {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.page-cases .cases-hero-actions {
  margin-top: var(--space-6);
}

/* 首屏右侧预告块 */
.page-cases .cases-hero-preview {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-6) var(--space-4);
  border-radius: var(--cases-radius);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-1);
}

.page-cases .cases-preview-kicker {
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  opacity: 0.82;
}

.page-cases .cases-preview-figure {
  display: flex;
  align-items: baseline;
  gap: var(--space-1);
  margin: 0;
}

.page-cases .cases-preview-value {
  font-family: var(--font-mono);
  font-size: var(--text-4xl);
  font-weight: 600;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.page-cases .cases-preview-unit {
  font-size: var(--text-lg);
  opacity: 0.85;
}

.page-cases .cases-preview-text {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.8;
  opacity: 0.9;
}

.page-cases .cases-preview-link {
  align-self: flex-start;
  margin-top: auto;
  color: var(--color-primary-ink);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-pill);
  padding: var(--space-1) var(--space-2);
  background: rgba(255, 255, 255, 0.16);
  transition: background-color 160ms ease;
}

.page-cases .cases-preview-link:hover {
  background: rgba(255, 255, 255, 0.28);
}

/* 吨位刻度尺 */
.page-cases .cases-scale {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.page-cases .cases-scale-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2);
}

.page-cases .cases-scale-head .cell-kicker {
  margin: 0;
}

.page-cases .cases-scale-note {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.page-cases .cases-scale-track {
  padding-inline: 30px;
}

.page-cases .cases-scale-rail {
  position: relative;
  height: 64px;
}

.page-cases .cases-scale-bar {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 8px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--color-primary-soft) 0%, var(--color-highlight) 42%, var(--color-accent) 100%);
}

.page-cases .cases-scale-ticks {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 100%;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-cases .cases-scale-ticks li {
  position: absolute;
  top: 14px;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.page-cases .cases-scale-ticks li:nth-child(1) { left: 0%; }
.page-cases .cases-scale-ticks li:nth-child(2) { left: 27.3%; }
.page-cases .cases-scale-ticks li:nth-child(3) { left: 45.4%; }
.page-cases .cases-scale-ticks li:nth-child(4) { left: 59%; }
.page-cases .cases-scale-ticks li:nth-child(5) { left: 72.7%; }
.page-cases .cases-scale-ticks li:nth-child(6) { left: 86.4%; }
.page-cases .cases-scale-ticks li:nth-child(7) { left: 100%; }

.page-cases .cases-scale-ticks li::before {
  content: "";
  display: block;
  width: 2px;
  height: 12px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  opacity: 0.55;
}

.page-cases .cases-scale-ticks li span {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.page-cases .cases-jump-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-cases .cases-jump-list .chip {
  text-decoration: none;
  transition: background-color 160ms ease, color 160ms ease;
}

.page-cases .cases-jump-list .chip:hover {
  background: var(--color-highlight);
  color: var(--color-ink);
}

/* ===== 工况分组 ===== */
.page-cases .case-group {
  padding-block: var(--section-y);
  scroll-margin-top: 96px;
}

.page-cases .case-group--deep {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border-radius: var(--cases-radius);
  margin-inline: var(--space-2);
}

.page-cases .case-group-head {
  max-width: 62ch;
  margin-bottom: var(--space-6);
}

.page-cases .case-group-head .cell-kicker {
  margin: 0;
}

.page-cases .case-group-head .section-title {
  margin: var(--space-2) 0 0;
}

.page-cases .case-group-text {
  margin: var(--space-3) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-cases .case-group--deep .cases-group-kicker,
.page-cases .case-group--deep .cases-group-title,
.page-cases .case-group--deep .cases-group-text {
  color: var(--color-primary-ink);
}

.page-cases .case-group--deep .cases-group-text {
  opacity: 0.9;
}

/* 分组网格 */
.page-cases .case-grid {
  display: grid;
  gap: var(--space-4);
}

/* ===== 单则场景 ===== */
.page-cases .case-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--cases-card-pad);
  border-radius: var(--cases-radius);
  background: var(--color-surface);
  box-shadow: var(--shadow-1);
  transition: box-shadow 180ms ease, transform 180ms ease;
}

.page-cases .case-item:hover,
.page-cases .case-item:focus-within {
  box-shadow: var(--shadow-2);
  transform: translateY(-2px);
}

.page-cases .case-item-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  justify-content: space-between;
}

.page-cases .case-item-title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-ink);
}

.page-cases .case-tonnage {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-cases .case-tonnage svg {
  display: block;
  width: 88px;
  height: auto;
}

.page-cases .case-line {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-2);
  align-items: start;
}

.page-cases .case-label {
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  background: var(--color-primary-soft);
  color: var(--color-accent);
  font-size: var(--text-xs);
  font-weight: 600;
  line-height: 1.7;
  white-space: nowrap;
}

.page-cases .case-line p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-ink-soft);
}

.page-cases .case-line--result p {
  font-size: var(--text-base);
  color: var(--color-ink);
  font-weight: 500;
}

.page-cases .case-line--result .num {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

/* 结果口径提示 */
.page-cases .case-tip {
  position: relative;
  display: inline-flex;
  align-items: center;
  margin-left: var(--space-1);
  padding: 1px 9px;
  border-radius: var(--radius-pill);
  background: var(--color-surface-deep);
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
  line-height: 1.7;
  font-weight: 400;
  vertical-align: middle;
  cursor: help;
  transition: background-color 160ms ease, color 160ms ease;
}

.page-cases .case-tip:hover,
.page-cases .case-tip:focus-visible {
  background: var(--color-highlight);
  color: var(--color-ink);
}

.page-cases .case-tip:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.page-cases .case-tip-pop {
  position: absolute;
  left: 0;
  bottom: calc(100% + 8px);
  z-index: 6;
  width: max-content;
  max-width: 230px;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-xs);
  line-height: 1.7;
  font-weight: 400;
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity 160ms ease, transform 160ms ease, visibility 160ms;
  pointer-events: none;
}

.page-cases .case-tip:hover .case-tip-pop,
.page-cases .case-tip:focus .case-tip-pop,
.page-cases .case-tip:focus-visible .case-tip-pop {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* 折叠面板 */
.page-cases .case-fold {
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  padding: var(--space-2) var(--space-3);
}

.page-cases .case-fold summary {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  cursor: pointer;
  list-style: none;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-ink);
  border-radius: var(--radius-sm);
}

.page-cases .case-fold summary::-webkit-details-marker {
  display: none;
}

.page-cases .case-fold summary::before {
  content: "+";
  display: inline-block;
  width: 16px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent);
  text-align: center;
}

.page-cases .case-fold[open] summary::before {
  content: "−";
}

.page-cases .case-fold summary:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
}

.page-cases .case-fold .fold-body {
  margin-top: var(--space-2);
}

.page-cases .case-fold .fold-body p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-ink-soft);
}

/* 图片 */
.page-cases .cases-media {
  position: relative;
  margin: 0;
  border-radius: var(--cases-radius);
  overflow: hidden;
  background: var(--color-surface-deep);
  box-shadow: var(--shadow-1);
}

.page-cases .cases-media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-cases .cases-media--wide { aspect-ratio: 3 / 2; }
.page-cases .cases-media--square { aspect-ratio: 1 / 1; }

.page-cases .cases-media .media-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: var(--space-6) var(--space-3) var(--space-3);
  background: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-size: var(--text-xs);
  line-height: 1.7;
}

/* 跳转锚点带 */
.page-cases .cases-jump {
  padding-block: var(--space-2) var(--space-6);
}

.page-cases .cases-jump .btn {
  text-decoration: none;
}

/* ===== 收尾：选型线索 ===== */
.page-cases .cases-outro {
  margin-inline: var(--space-2);
  margin-bottom: var(--space-8);
  padding-block: var(--section-y-lg);
  border-radius: var(--cases-radius);
  background: var(--color-primary-soft);
  scroll-margin-top: 96px;
}

.page-cases .cases-outro .section-title {
  margin: var(--space-2) 0 0;
}

.page-cases .cases-outro-lede {
  margin: var(--space-3) 0 0;
  max-width: 58ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-cases .cases-clues {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.page-cases .cases-clue {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--cases-card-pad);
  border-radius: var(--cases-radius);
  background: var(--color-surface);
  box-shadow: var(--shadow-1);
  transition: box-shadow 180ms ease, transform 180ms ease;
}

.page-cases .cases-clue:hover {
  box-shadow: var(--shadow-2);
  transform: translateY(-2px);
}

.page-cases .cases-clue-index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: 600;
  line-height: 1;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.page-cases .cases-clue-title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-ink);
}

.page-cases .cases-clue-text {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.85;
  color: var(--color-ink-soft);
}

.page-cases .cases-outro-text {
  margin: var(--space-6) 0 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-cases .cases-outro-text a {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-sm);
  padding: 1px 2px;
  transition: background-color 160ms ease;
}

.page-cases .cases-outro-text a:hover {
  background: var(--color-surface);
}

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

/* ===== 平板与桌面 ===== */
@media (min-width: 720px) {
  .page-cases .cases-hero-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-4);
  }

  .page-cases .cases-hero-preview {
    padding: var(--space-6);
  }

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

@media (min-width: 960px) {
  .page-cases .cases-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-cases .cases-scale {
    grid-column: 1 / -1;
    margin-top: var(--space-4);
  }

  .page-cases .case-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: var(--space-4);
  }

  .page-cases .case-span-4 { grid-column: span 4; }
  .page-cases .case-span-5 { grid-column: span 5; }
  .page-cases .case-span-6 { grid-column: span 6; }
  .page-cases .case-span-7 { grid-column: span 7; }
  .page-cases .case-span-8 { grid-column: span 8; }
  .page-cases .case-span-12 { grid-column: span 12; }

  .page-cases .cases-clues {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1200px) {
  .page-cases .cases-media--square {
    aspect-ratio: 4 / 5;
  }
}

/* ===== 窄屏收敛 ===== */
@media (max-width: 767px) {
  .page-cases .cases-scale-ticks li:nth-child(2),
  .page-cases .cases-scale-ticks li:nth-child(4),
  .page-cases .cases-scale-ticks li:nth-child(6) {
    display: none;
  }

  .page-cases .cases-scale-track {
    padding-inline: 22px;
  }

  .page-cases .cases-hero-title {
    max-width: none;
  }

  .page-cases .case-item-head {
    justify-content: flex-start;
  }

  .page-cases .cases-media--wide {
    aspect-ratio: 4 / 3;
  }

  .page-cases .cases-outro,
  .page-cases .case-group--deep {
    margin-inline: var(--space-1);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-cases .case-item,
  .page-cases .cases-clue,
  .page-cases .case-tip,
  .page-cases .case-tip-pop,
  .page-cases .cases-preview-link,
  .page-cases .cases-jump-list .chip {
    transition: none;
  }

  .page-cases .case-item:hover,
  .page-cases .case-item:focus-within,
  .page-cases .cases-clue:hover {
    transform: none;
  }
}
<<<END>>>