/* cases：可以翻的案例册。只选中 #cases 里的元素。 */
#cases {
  --cases-stage-h: clamp(500px, 66vh, 680px);
  --cases-glow: #1b1e22;
}

#cases .cases-head .hl-lead { max-width: 46em; }

/* ---------- 书（桌面） ---------- */
#cases .cases-book { margin-top: 8px; }
#cases .cases-stage {
  position: relative; height: var(--cases-stage-h); outline: none;
  background:
    radial-gradient(ellipse 46% 50% at 50% 54%, var(--cases-glow) 0%, var(--bg-raised) 52%, transparent 80%),
    var(--bg);
}
#cases .cases-stage::after { /* 上下边缘淡出，和页面底色接上 */
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(to bottom, var(--bg) 0, transparent 9%, transparent 91%, var(--bg) 100%);
}
#cases .cases-stage:focus-visible::before {
  content: ""; position: absolute; inset: 10px max(10px, calc(50% - 760px)); border: 2px solid var(--amber); border-radius: var(--r-panel); pointer-events: none; z-index: 1;
}
#cases .cases-gl { width: 100%; height: 100%; touch-action: pan-y; }
#cases .cases-stage.is-dragging, #cases .cases-stage.is-dragging * { cursor: grabbing !important; }
#cases .cases-hint {
  position: absolute; left: 0; top: 0; z-index: 2; pointer-events: none;
  padding: 5px 12px; border-radius: 999px; background: rgba(20, 22, 25, .94); border: 1px solid var(--line-strong);
  font-size: var(--fs-label); line-height: 1.5; color: var(--ink-1); white-space: nowrap;
  opacity: 0; transform: translate3d(0, 0, 0); transition: opacity .15s var(--ease);
}
#cases .cases-hint.is-on { opacity: 1; }

#cases .cases-bar { display: flex; align-items: center; justify-content: center; gap: 14px; margin-top: 4px; position: relative; z-index: 1; }
#cases .cases-nav {
  width: 44px; height: 44px; display: inline-grid; place-items: center; border-radius: 50%;
  border: 1px solid var(--line-strong); background: var(--bg-raised); color: var(--ink-1); cursor: pointer;
  transition: border-color .2s var(--ease), background .2s var(--ease);
}
#cases .cases-nav:hover:not(:disabled) { border-color: var(--ink-3); background: var(--surface); }
#cases .cases-nav:active:not(:disabled) { transform: scale(.97); }
#cases .cases-nav:disabled { opacity: .35; cursor: default; }
#cases .cases-where { min-width: 300px; display: flex; justify-content: center; align-items: baseline; gap: 12px; font-size: 15px; color: var(--ink-1); }
#cases .cases-count { font-family: var(--mono); font-size: var(--fs-label); color: var(--ink-3); }
#cases .cases-close { height: 36px; padding: 0 14px; border-radius: var(--r-btn); border: 1px solid var(--line); background: none; color: var(--ink-2); font-size: var(--fs-small); cursor: pointer; }
#cases .cases-close:hover:not(:disabled) { color: var(--ink-1); border-color: var(--line-strong); }
#cases .cases-close:disabled { visibility: hidden; }
#cases .cases-howto { margin-top: 12px; text-align: center; font-size: var(--fs-label); color: var(--ink-3); }

/* ---------- 卡片（手机；桌面时只给读屏和键盘用） ---------- */
#cases .cases-cards { list-style: none; margin: 0; padding: 0; }
#cases .cases-card h3 { font-size: var(--fs-h3); line-height: 1.3; margin-top: 10px; }
#cases .cases-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 14px; font-size: var(--fs-small); color: var(--ink-3); }
#cases .cases-status { padding: 1px 10px; border: 1px solid var(--line-strong); border-radius: 999px; color: var(--ink-1); font-size: var(--fs-label); }
#cases .cases-summary { margin-top: 10px; color: var(--ink-2); }
#cases .cases-points { margin: 14px 0 0; padding: 0; list-style: none; display: grid; gap: 8px; font-size: var(--fs-small); color: var(--ink-2); }
#cases .cases-points li { position: relative; padding-left: 18px; }
#cases .cases-points li::before { content: ""; position: absolute; left: 0; top: .78em; width: 8px; height: 2px; background: var(--ink-4); }
#cases .cases-obj { margin: 22px 0 0; }
#cases .cases-obj-canvas { width: 100%; height: auto; border-radius: var(--r-panel); background: var(--surface); touch-action: pan-y; }
#cases .cases-obj:focus-within .cases-obj-canvas { outline: 2px solid var(--amber); outline-offset: 3px; }
#cases .cases-shots { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 20px; }
#cases .cases-shots img { width: 100%; height: auto; border-radius: 10px; border: 1px solid var(--line); background: var(--surface); }
#cases .cases-link { display: inline-flex; align-items: center; gap: 8px; margin-top: 18px; font-size: 15px; font-weight: 600; color: var(--ink-1); border-bottom: 1px solid var(--line-strong); padding-bottom: 2px; }
#cases .cases-link::after { content: "→"; font-weight: 400; color: var(--ink-3); }
#cases .cases-card--end .hl-btn { margin-top: 20px; }
#cases .cases-own { margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--line); font-size: var(--fs-small); color: var(--ink-3); }
#cases .cases-own .cases-link { display: flex; width: fit-content; margin-top: 8px; }

@media (min-width: 900px) {
  #cases .cases-cards { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: normal; }
}
@media (max-width: 899px) {
  #cases .cases-book { display: none; }
  #cases .cases-cards { width: 100%; max-width: calc(640px + var(--pad) * 2); margin: 40px auto 0; padding: 0 var(--pad); display: grid; gap: 56px; }
  #cases .cases-card { padding-top: 28px; border-top: 1px solid var(--line); }
}
@media (prefers-reduced-motion: reduce) {
  #cases .cases-hint { transition: none; }
}