html,
body {
  height: 100%;
}
body {
  margin: 0;
  background: #161616;
  color: #f4f4f4;
  font-family: "IBM Plex Sans", system-ui, -apple-system, Segoe UI, Roboto,
    "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

.app {
  display: flex;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

/* ===== Sidebar (Tree View style Carbon) ===== */
aside#sidebar {
  width: 320px;
  min-width: 280px;
  max-width: 380px;
  background: #262626;
  border-right: 1px solid #393939;
  overflow: auto;
}
.sidebar__wrap {
  padding: 1rem 1rem 2rem;
}
.sidebar__title {
  font-size: 0.875rem;
  color: #8d8d8d;
  margin: 0.25rem 0 1rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

/* Search */
.search {
  margin-bottom: 0.75rem;
}
.search input {
  width: 100%;
  border: 1px solid #525252;
  border-radius: 0.25rem;
  background: #161616;
  color: #f4f4f4;
  padding: 0.625rem 0.75rem;
}
.search input:focus {
  outline: 2px solid #0f62fe;
  border-color: #0f62fe;
}

/* Tree */
.tree {
  list-style: none;
  margin: 0;
  padding: 0.5rem;
  background: #f4f4f41a;
  border-radius: 0.25rem;
}
.tree li {
  margin: 0.125rem 0;
}
.tree__node {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.5rem;
  border-radius: 0.25rem;
  cursor: pointer;
  color: #e0e0e0;
}
.tree__node:hover {
  background: #393939;
}
.tree__node[aria-current="true"] {
  background: #0f62fe33;
}
.tree__icon {
  width: 1rem;
  height: 1rem;
  display: inline-block;
  opacity: 0.9;
}
.tree__caret {
  width: 1rem;
  height: 1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transform: rotate(-90deg);
  transition: transform 0.15s ease;
  color: #c6c6c6;
}
.tree__node.expanded > .tree__caret {
  transform: rotate(0deg);
}
.tree__children {
  margin-left: 1.5rem;
  padding-left: 0.5rem;
  border-left: 1px dashed #525252;
  display: none;
}
.tree__node.expanded + .tree__children {
  display: block;
}

/* ===== Viewer (OpenSeadragon) ===== */
main#viewer {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: #000;
}
.viewer__toolbar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: #161616;
  border-bottom: 1px solid #393939;
}
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.5rem;
  border-radius: 999px;
  font-size: 0.75rem;
  background: #393939;
}
.tag--green {
  background: #198038;
}
#openseadragon {
  flex: 1;
  background: #000;
  min-height: 0;
}
.btn-set {
  margin-top: 0.5rem;
  display: flex;
  gap: 0.375rem;
  flex-wrap: wrap;
}
.btn {
  border: 1px solid #6f6f6f;
  background: #262626;
  color: #f4f4f4;
  padding: 0.375rem 0.625rem;
  border-radius: 0.25rem;
  cursor: pointer;
}
.btn:hover {
  background: #393939;
}

/* == pre-fetching tile image osd == */
.osd.blurring canvas {
  filter: blur(3px);
  transform: translateZ(0);
}

/* collapse / expand sidebar */
.app { transition: grid-template-columns .18s ease; }
.app.sidebar-collapsed aside#sidebar { width:0; min-width:0; max-width:0; border-right:0; }
.app.sidebar-collapsed aside#sidebar .sidebar__wrap { display:none; }

/* sebelumnya .osd.blurring ... → samakan dengan id */
#openseadragon.blurring canvas {
  filter: blur(3px);
  transform: translateZ(0);
}