/* ------------------------------------------------------------
   3 · PANELS — flat by default, no border / no shadow
   ------------------------------------------------------------ */
.dcs-panel {
  background: var(--dcs-bg);
  border-radius: var(--dcs-r-2);
  display: flex; flex-direction: column;
  min-height: 0;
}
.dcs-panel--raised   { background: var(--dcs-surface-1); }
.dcs-panel--bordered { border: 1px solid var(--dcs-line); }

.dcs-panel__header {
  display: flex; align-items: center; gap: var(--dcs-s-3);
  height: var(--dcs-h);
  padding: 0 var(--dcs-s-4);
  background: var(--dcs-surface-1);
  border-bottom: 1px solid var(--dcs-line);
  border-top-left-radius: var(--dcs-r-2);
  border-top-right-radius: var(--dcs-r-2);
  font-size: var(--dcs-fs-sm);
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--dcs-text-dim);
  user-select: none;
}
.dcs-panel__header--active { color: var(--dcs-text); }
.dcs-panel__title { display:flex; align-items:center; gap: var(--dcs-s-2); flex:1; min-width:0; }
.dcs-panel__title svg { color: var(--dcs-text-mute); }
.dcs-panel__tools { display:flex; align-items:center; gap: 2px; }
.dcs-panel__close {
  width: 18px; height: 18px;
  display: flex; align-items: center; justify-content: center;
  margin-left: var(--dcs-s-2);
  color: var(--dcs-text-mute);
  background: transparent;
  border: none;
  border-radius: var(--dcs-r-1);
  cursor: pointer;
  opacity: .7;
  transition: opacity var(--dcs-t-fast), color var(--dcs-t-fast), background var(--dcs-t-fast);
}
.dcs-panel__close:hover { opacity: 1; color: var(--dcs-danger); background: rgba(239,107,107,.15); }

.dcs-panel__body {
  padding: var(--dcs-s-5);
  flex: 1; min-height: 0;
  overflow: auto;
}
.dcs-panel__body--pad-0 { padding: 0; }
.dcs-panel__body--pad-sm { padding: var(--dcs-s-3); }

.dcs-panel__footer {
  display:flex; align-items:center; gap: var(--dcs-s-3);
  height: var(--dcs-h-sm);
  padding: 0 var(--dcs-s-4);
  background: var(--dcs-surface-1);
  border-top: 1px solid var(--dcs-line);
  color: var(--dcs-text-mute);
  font-size: var(--dcs-fs-xs);
  font-family: var(--dcs-font-mono);
}

/* Panel tab bar (Blender-ish) */
.dcs-tabs {
  display: flex; align-items: stretch;
  background: var(--dcs-surface-1);
  border-bottom: 1px solid var(--dcs-line);
  padding: 0 var(--dcs-s-3);
  gap: 2px;
  user-select: none;
}
.dcs-tab {
  display: inline-flex; align-items: center; gap: var(--dcs-s-2);
  padding: 0 var(--dcs-s-4);
  height: calc(var(--dcs-h) - 2px);
  margin-top: 2px;
  font-size: var(--dcs-fs-sm);
  color: var(--dcs-text-dim);
  background: transparent;
  border: 1px solid transparent;
  border-bottom: none;
  border-top-left-radius: var(--dcs-r-1);
  border-top-right-radius: var(--dcs-r-1);
  cursor: pointer;
  transition: background var(--dcs-t-fast), color var(--dcs-t-fast);
}
.dcs-tab:hover { background: var(--dcs-surface-2); color: var(--dcs-text); }
.dcs-tab[aria-selected="true"] {
  background: var(--dcs-bg);
  color: var(--dcs-text);
  border-color: var(--dcs-line);
  position: relative;
}
.dcs-tab[aria-selected="true"]::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -1px; height: 1px;
  background: var(--dcs-bg);
}

/* Tab panels: ensure `[hidden]` actually hides the panel even when its
   body sets `display: flex` (or grid) via a class — otherwise content
   from the inactive tab can bleed through under the active tab. Two
   attribute selectors give us specificity (0,2,0) which beats any
   single-class layout rule (0,1,0) without needing !important. */
[data-dcs-tabpanel][hidden] { display: none; }