/* ---- 版面比例：左彈性區 + 右固定 360px ---- */
.demo-grid {
  display: grid;
  grid-template-columns: 1fr 360px; /* 左側自適應，右側固定寬 */
  gap: 16px;
  align-items: start;
}

/* 右側面板以卡片疊放（維持現在樣式即可） */
.panel {
  display: grid;
  gap: 16px;
}

/* ---- 斷點：和效能頁一致 ---- */
@media (max-width: 1100px) {
  .demo-grid {
    grid-template-columns: 1fr 340px; /* 右欄略縮 */
  }
}

@media (max-width: 900px) {
  .demo-grid {
    grid-template-columns: 1fr; /* 窄螢幕改單欄堆疊 */
  }
}

/* ===== 左：操作舞台（外框 + 內框） ===== */
.stage {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
}
.stage-inner {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  display: grid;
  gap: 16px;
  max-width: 900px; /* 與效能頁相近的視覺寬度上限 */
  margin: 0 auto; /* 舞台置中 */
}
.row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.card {
  width: 120px;
  height: 120px;
  border-radius: 14px;
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  font-weight: 700;
  cursor: grab;
  user-select: none;
}
.card:active {
  cursor: grabbing;
}
.card[data-id="A"] {
  background: #254a72;
}
.card[data-id="B"] {
  background: #2d6a4f;
}

.drops {
  display: grid;
  grid-template-columns: 1fr 1fr; /* 兩等分 */
  gap: 16px;
}

.dropzone {
  min-height: 260px; /* 縮小高度 */
  border-radius: 14px;
  border: 2px dashed #5a6472;
  display: grid;
  place-items: center;
  color: var(--muted);
  background: #0f131a;
  transition: 0.15s ease;
}

.dropzone.over {
  border-color: var(--accent);
  color: #cdebd6;
}
.dropzone.bg-A {
  background: #1a2c42;
  border-color: #254a72;
  color: #cfe9ff;
}
.dropzone.bg-B {
  background: #123626;
  border-color: #2d6a4f;
  color: #cdebd6;
}

.hint {
  font-size: 12px;
  color: var(--muted);
}

/* ===== 右：事件卡片群 ===== */
.panel {
  display: grid;
  gap: 16px;
}
.panel-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 14px;
  display: grid;
  gap: 10px;
}
.panel-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  opacity: 0.92;
}

/* 事件顯示 */
.event-stack {
  display: grid;
  gap: 8px;
}
.event-big {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  font-size: 18px;
  font-weight: 800;
  text-align: center;
  min-height: 52px;
}
.event-big.subtle {
  opacity: 0.95;
}
.event-big.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", monospace;
  font-size: 16px;
  font-weight: 700;
}

/* dragenter 白色閃光，避免被 dragover 洗掉 */
.flash {
  animation: flash-bg 420ms ease;
}
@keyframes flash-bg {
  0% {
    box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.55);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(255, 255, 255, 0.18);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(255, 255, 255, 0);
  }
}