/* ── Base Side Panel ─────────────────────────────────────────────────────── */
/*
 * Right-side slide-over panel with a dimmed full-viewport backdrop. The
 * content behind the backdrop stays mounted (not replaced) - this is
 * meant for detail views layered on top of a list (e.g. the feedback
 * board's item detail).
 *
 * Markup:
 *   <div class="base-side-panel-backdrop" data-action="...">
 *   <div class="base-side-panel">
 *     <div class="base-side-panel__header">...</div>
 *     <div class="base-side-panel__body">...</div>
 *     <div class="base-side-panel__footer">...</div>
 *   </div>
 *
 * JS: window.BaseSidePanel.open(panelEl, backdropEl, opts)
 *     window.BaseSidePanel.close(panelEl, backdropEl, opts)
 */

.base-side-panel-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  z-index: 9990;
}
.base-side-panel-backdrop.is-open {
  opacity: 1;
  pointer-events: auto;
}

.base-side-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(520px, 100vw);
  background: var(--card-bg);
  border-left: 1px solid var(--border-color);
  box-shadow: -12px 0 40px rgba(0, 0, 0, 0.16);
  transform: translateX(100%);
  transition: transform 0.25s cubic-bezier(0.2, 0, 0, 1);
  z-index: 9991;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}
.base-side-panel.is-open {
  transform: translateX(0);
}

.base-side-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.base-side-panel__body {
  flex: 1;
  overflow: auto;
  padding: 20px;
}

.base-side-panel__footer {
  flex-shrink: 0;
  padding: 14px 20px;
  border-top: 1px solid var(--border-color);
}

@media (max-width: 720px) {
  .base-side-panel {
    width: 100vw;
  }
}