/* This is deliberately non-modal: the architecture remains visible and usable. */
.mg-buffer-popup {
  --buffer-color: #004C99;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  position: fixed;
  z-index: 1400;
  right: 20px;
  bottom: 20px;
  width: min(560px, calc(100vw - 40px));
  max-height: min(740px, 76vh);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 2px solid var(--buffer-color);
  border-radius: 12px;
  background: var(--bg-card, #fff);
  color: var(--text-main, #172033);
  box-shadow: 0 14px 48px rgba(0, 0, 0, .32);
  font: 12px/1.5 var(--font-ui);
}
.mg-buffer-popup[hidden] { display: none; }
.mg-buffer-popup[data-dock="left"] { right: auto; left: 20px; }
.mg-buffer-popup * { box-sizing: border-box; }
.mg-buffer-heading {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-color, #d7dde5);
}
.mg-buffer-heading h3 { flex: 1; margin: 0; font: 600 14px/1.4 var(--font-ui); }
.mg-buffer-heading .mg-buffer-button { flex-shrink: 0; }
.mg-buffer-body { padding: 10px 12px 12px; overflow: auto; overscroll-behavior: contain; }
.mg-buffer-popup p { margin: 0 0 8px; line-height: 1.5; }
.mg-buffer-popup h4 { margin: 10px 0 6px; font-size: 12px; }
.mg-buffer-help { font-size: 11px; color: var(--text-muted, #536174); }
.mg-buffer-tabs, .mg-buffer-controls, .mg-buffer-pager { display: flex; align-items: center; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.mg-buffer-button {
  border: 1px solid var(--border-color, #c4ccd6);
  border-radius: 5px;
  background: var(--bg-body, #f7f9fc);
  color: var(--text-main, #172033);
  padding: 5px 9px;
  font: inherit;
  cursor: pointer;
}
.mg-buffer-button:disabled { opacity: .45; cursor: default; }
.mg-buffer-tabs .mg-buffer-button { flex: 1; }
.mg-buffer-tabs .mg-buffer-button[aria-pressed="true"] { color: #fff; background: var(--buffer-color); border-color: var(--buffer-color); }
.mg-buffer-follow { display: flex; align-items: center; gap: 5px; margin-left: auto; font-size: 11px; cursor: pointer; }
.mg-buffer-follow input { accent-color: var(--buffer-color); }
.mg-buffer-state { font-weight: 600; overflow-wrap: anywhere; }
.mg-buffer-meta { font-size: 11px; color: var(--text-muted, #536174); overflow-wrap: anywhere; }
.mg-buffer-note { padding: 6px 8px; border-left: 3px solid #aa7100; background: rgba(170, 113, 0, .09); font-size: 11px; overflow-wrap: anywhere; }
.mg-buffer-range { font-size: 11px; margin-right: auto; }
.mg-buffer-row-input { width: 78px; border: 1px solid var(--border-color, #c4ccd6); border-radius: 4px; background: var(--bg-body, #f7f9fc); color: var(--text-main, #172033); font: inherit; padding: 4px 5px; }
.mg-buffer-grid-scroll { overflow: auto; border: 1px solid var(--border-color, #c4ccd6); border-radius: 6px; max-height: 325px; overscroll-behavior: contain; }
.mg-buffer-grid { width: 100%; min-width: 0; margin: 0; border-spacing: 2px; border-collapse: separate; table-layout: auto; font-size: 10px; }
.mg-buffer-grid th, .mg-buffer-grid td { padding: 0; border: 0; text-align: center; vertical-align: middle; }
.mg-buffer-grid th { background: var(--bg-card, #fff); color: var(--text-muted, #536174); padding: 2px 4px; font: 600 10px/1.3 var(--font-ui); }
.mg-buffer-grid thead th { position: sticky; top: 0; z-index: 2; }
.mg-buffer-grid tbody th, .mg-buffer-grid thead th:first-child { position: sticky; left: 0; min-width: 40px; z-index: 1; }
.mg-buffer-grid thead th:first-child { z-index: 3; }
.mg-buffer-cell {
  display: block;
  min-width: 76px;
  width: 100%;
  padding: 4px 3px;
  border: 1px solid transparent;
  border-radius: 4px;
  background: #E6EDF5;
  color: #004C99;
  font: 10px/1.3 'SF Mono', Consolas, monospace;
  white-space: nowrap;
  cursor: pointer;
}
.mg-buffer-popup[data-operand="W"] .mg-buffer-cell { color: #006633; background-color: #E6F0EB; }
.mg-buffer-popup[data-operand="O"] .mg-buffer-cell { color: #990000; background-color: #F5E6E6; }
.mg-buffer-cell-label, .mg-buffer-cell-address { display: block; }
.mg-buffer-cell-address { margin-top: 2px; font-size: 9px; opacity: .85; }
.mg-buffer-cell-active { border-color: currentColor; box-shadow: inset 0 0 0 1px currentColor; font-weight: 700; }
.mg-buffer-cell-selected { outline: 2px dashed var(--buffer-color); outline-offset: -3px; }
.mg-buffer-cell-empty { opacity: .45; }
.mg-buffer-cell-written { font-weight: 700; }
.mg-buffer-popup[data-operand="O"] .mg-buffer-cell-partial { color: #4C0099; background-color: #EDE6F5; background-image: repeating-linear-gradient(-45deg, transparent, transparent 5px, rgba(76, 0, 153, .06) 5px, rgba(76, 0, 153, .06) 8px); }
.mg-buffer-cell[data-transfer-state="arrived"], .mg-buffer-cell[data-transfer-state="written"], .mg-buffer-cell[data-transfer-state="preview-written"] { border-bottom-width: 3px; border-bottom-color: currentColor; }
.mg-buffer-details { margin-top: 8px !important; min-height: 42px; font-size: 11px; overflow-wrap: anywhere; }
.mg-buffer-events { max-height: 120px; overflow: auto; overscroll-behavior: contain; }
.mg-buffer-event { display: block; width: 100%; text-align: left; border: 0; border-left: 3px solid var(--buffer-color); padding: 4px 7px; margin-bottom: 4px; background: var(--bg-body, #f7f9fc); color: var(--text-main, #172033); font: 11px/1.4 var(--font-ui); cursor: pointer; overflow-wrap: anywhere; }
.mg-buffer-popup button:focus-visible, .mg-buffer-popup input:focus-visible { outline: 3px solid var(--primary-color, #875cff); outline-offset: 1px; }
@media (max-width: 650px) {
  .mg-buffer-popup { right: 8px; bottom: 8px; width: calc(100vw - 16px); max-height: 58vh; max-height: 58dvh; border-radius: 10px; }
  .mg-buffer-popup[data-dock="left"] { left: 8px; }
  #mgBufferPopupDock { display: none; }
  .mg-buffer-heading { padding: 5px 8px; }
  .mg-buffer-heading h3 { font-size: 12px; }
  .mg-buffer-body { padding: 6px 8px; }
  .mg-buffer-popup p { margin-bottom: 5px; }
  .mg-buffer-help, .mg-buffer-meta, .mg-buffer-note { font-size: 10px; line-height: 1.35 !important; }
  .mg-buffer-note { padding: 4px 6px; }
  .mg-buffer-tabs, .mg-buffer-controls, .mg-buffer-pager { gap: 4px; margin-bottom: 5px; }
  .mg-buffer-button { padding: 4px 6px; font-size: 11px; }
  .mg-buffer-state { font-size: 11px; line-height: 1.35 !important; }
  .mg-buffer-follow { margin-left: 0; }
  .mg-buffer-grid-scroll { max-height: 260px; }
}
@media (prefers-reduced-motion: reduce) {
  .mg-buffer-popup * { scroll-behavior: auto !important; }
}