* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #1a1a2e;
  color: #e0e0e0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

header {
  background: #16213e;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  gap: 20px;
  border-bottom: 1px solid #0f3460;
}

header h1 { font-size: 1.2em; color: #e94560; white-space: nowrap; }
#patient-info { font-size: 0.85em; color: #999; flex: 1; }

#layout-selector { display: flex; gap: 4px; margin-left: auto; }
.layout-btn {
  background: #0f3460;
  border: 1px solid #333;
  color: #999;
  font-size: 1.1em;
  padding: 2px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.layout-btn:hover { color: #fff; border-color: #666; }
.layout-btn.active { background: #e94560; color: #fff; border-color: #e94560; }

#app {
  display: flex;
  flex: 1;
  overflow: hidden;
}

#sidebar {
  width: 240px;
  background: #16213e;
  padding: 12px;
  overflow-y: auto;
  border-right: 1px solid #0f3460;
  flex-shrink: 0;
}

#sidebar h2 { font-size: 0.9em; color: #e94560; margin-bottom: 8px; text-transform: uppercase; letter-spacing: 1px; }

.series-item {
  padding: 8px 10px;
  margin-bottom: 4px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.82em;
  background: #1a1a2e;
  transition: background 0.2s;
}

.series-item:hover { background: #0f3460; }
.series-item.active { background: #e94560; color: #fff; }
.series-item .count { color: #666; font-size: 0.8em; }
.series-item.unsupported { opacity: 0.55; }
.series-item.unsupported.active { opacity: 0.9; }
.series-badge { color: #ffc66d; margin-left: 4px; font-size: 0.9em; }

#metadata-panel { margin-top: 16px; }
#metadata-content { font-size: 0.78em; line-height: 1.6; color: #999; }
#metadata-content .label { color: #e94560; }

.collapsible { cursor: pointer; user-select: none; display: flex; align-items: center; gap: 6px; }
.collapsible:hover { color: #fff; }
.collapse-arrow { font-size: 0.7em; transition: transform 0.2s; }
.collapsible:not(.collapsed) .collapse-arrow { transform: rotate(90deg); }

#folder-loader { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
#folder-loader #folder-btn {
  padding: 6px 10px;
  background: #0f3460;
  border: 1px solid #2a3a5a;
  color: #cde;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.82em;
}
#folder-loader #folder-btn:hover { background: #16407a; }
#folder-loader #folder-status { font-size: 0.75em; color: #7a8696; }

#overlay-section { margin-top: 16px; }
#overlay-section h2 { font-size: 0.9em; color: #e94560; margin-bottom: 8px; text-transform: uppercase; letter-spacing: 1px; }
#overlay-section select, #overlay-section input[type="range"] { width: 100%; font-size: 0.85em; }
#overlay-section label { display: block; font-size: 0.8em; color: #aaa; margin-top: 6px; }
#overlay-section #overlay-clear {
  width: 100%; margin-top: 8px; padding: 4px 8px;
  background: #2a2a2a; border: 1px solid #444; color: #ccc;
  border-radius: 4px; cursor: pointer; font-size: 0.8em;
}
#overlay-section #overlay-clear:hover { background: #3a3a3a; }

#bookmarks-section { margin-top: 16px; }
#bookmarks-section h2 { font-size: 0.9em; color: #e94560; margin-bottom: 8px; text-transform: uppercase; letter-spacing: 1px; }
#bookmarks-section #save-bookmark-btn {
  width: 100%;
  padding: 6px 12px;
  background: #e94560;
  border: none;
  color: #fff;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.82em;
  margin-bottom: 8px;
}
#bookmarks-section #save-bookmark-btn:hover { background: #d63a55; }

#bookmark-list { display: flex; flex-direction: column; gap: 4px; }
#bookmark-list .bookmark-chip {
  width: 100%;
  justify-content: space-between;
}

#export-section { margin-top: 16px; }
#export-section h2 { font-size: 0.9em; color: #e94560; margin-bottom: 8px; text-transform: uppercase; letter-spacing: 1px; }
.export-controls { display: flex; gap: 6px; }
.export-controls select {
  flex: 0 0 auto;
  background: #0f3460;
  color: #ccc;
  border: 1px solid #333;
  border-radius: 4px;
  padding: 4px 6px;
  font-size: 0.82em;
}
.export-controls button {
  flex: 1;
  padding: 6px 12px;
  background: #e94560;
  border: none;
  color: #fff;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.82em;
}
.export-controls button:hover { background: #d63a55; }

#viewer-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 8px;
  gap: 8px;
  overflow: hidden;
}

#quad-view {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  flex: 1;
  gap: 4px;
  min-height: 0;
}

#quad-view.expanded {
  grid-template-columns: 1fr;
  grid-template-rows: 1fr;
}

#quad-view.expanded > .view-panel {
  display: none;
}

#quad-view.expanded > .view-panel.expanded-panel {
  display: flex;
}

/* 3+1 layout: axial top-left, sagittal+coronal bottom-left, 3D full right */
#quad-view.layout-3plus1 {
  grid-template-columns: 1fr 4px 2fr 4px 3fr;
  grid-template-rows: 2fr 4px 1fr;
}
#quad-view.layout-3plus1 #axial-panel { grid-row: 1; grid-column: 1 / 4; }
#quad-view.layout-3plus1 #view-divider-h { grid-row: 2; grid-column: 1 / 4; display: block; }
#quad-view.layout-3plus1 #sagittal-panel { grid-row: 3; grid-column: 1; }
#quad-view.layout-3plus1 #view-divider-v2 { grid-row: 3; grid-column: 2; display: block; }
#quad-view.layout-3plus1 #coronal-panel { grid-row: 3; grid-column: 3; }
#quad-view.layout-3plus1 #view-divider { grid-row: 1 / 4; grid-column: 4; display: block; }
#quad-view.layout-3plus1 #volume3d-panel { grid-row: 1 / 4; grid-column: 5; }

/* Axial + 3D side by side with draggable divider */
#quad-view.layout-ax3d {
  grid-template-columns: 1fr 4px 1fr;
  grid-template-rows: 1fr;
}
#quad-view.layout-ax3d #axial-panel { grid-column: 1; }
#quad-view.layout-ax3d #view-divider { grid-column: 2; display: block; }
#quad-view.layout-ax3d #volume3d-panel { grid-column: 3; }
#quad-view.layout-ax3d #sagittal-panel,
#quad-view.layout-ax3d #coronal-panel { display: none; }

.view-divider, .view-divider-v2 {
  display: none;
  background: #333;
  cursor: col-resize;
  transition: background 0.15s;
  border-radius: 2px;
}
.view-divider-h {
  display: none;
  background: #333;
  cursor: row-resize;
  transition: background 0.15s;
  border-radius: 2px;
}
.view-divider:hover, .view-divider.dragging,
.view-divider-h:hover, .view-divider-h.dragging,
.view-divider-v2:hover, .view-divider-v2.dragging {
  background: #e94560;
}

.view-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: #000;
  border-radius: 8px;
  overflow: hidden;
  border: 2px solid #333;
  min-width: 0;
  min-height: 0;
  cursor: pointer;
  transition: border-color 0.15s;
}

.view-panel.active-panel {
  border-color: #e94560;
}

.view-label {
  padding: 4px 10px;
  font-size: 0.75em;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #e94560;
  background: #111;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.view-label .slice-info { flex: 1; text-align: right; }

.expand-btn {
  margin-left: auto;
  background: none;
  border: 1px solid #444;
  color: #999;
  font-size: 1em;
  cursor: pointer;
  padding: 0 4px;
  border-radius: 3px;
  line-height: 1.2;
  transition: color 0.2s, border-color 0.2s;
}

.expand-btn:hover { color: #e94560; border-color: #e94560; }

.view-mode-select {
  background: transparent;
  border: none;
  color: #e94560;
  font-size: 1em;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 1px;
  cursor: pointer;
  outline: none;
}
.view-mode-select option { background: #111; color: #e94560; }

.slice-info { color: #666; }

.canvas-wrap {
  flex: 1;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.canvas-wrap canvas {
  width: 100%;
  height: 100%;
  image-rendering: pixelated;
  object-fit: contain;
}

.view-panel input[type="range"] {
  width: 100%;
  accent-color: #e94560;
}

#controls {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 6px 12px;
  background: #16213e;
  border-radius: 8px;
  font-size: 0.8em;
}

#controls label { display: flex; align-items: center; gap: 6px; white-space: nowrap; }
#controls input[type="range"] { width: 120px; accent-color: #e94560; }
#controls button {
  padding: 4px 12px;
  background: #e94560;
  border: none;
  color: #fff;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85em;
}

.preset-group { display: flex; gap: 4px; margin-left: 8px; }
.preset-btn {
  padding: 3px 8px !important;
  background: #0f3460 !important;
  font-size: 0.75em !important;
  border: 1px solid #333 !important;
  transition: background 0.2s;
}
.preset-btn:hover { background: #e94560 !important; }

/* (view toggle bar removed — quad view is default) */

#volume3d-panel {
  position: relative;
}

#volume3d-container {
  flex: 1;
  position: relative;
  min-height: 0;
  overflow: hidden;
}

#volume3d-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

#volume3d-controls, #solid3d-controls {
  position: absolute;
  bottom: 8px;
  left: 8px;
  right: 8px;
  display: flex;
  gap: 16px;
  padding: 6px 12px;
  background: rgba(22, 33, 62, 0.85);
  border-radius: 6px;
  font-size: 0.78em;
  backdrop-filter: blur(4px);
}

.vol-controls-left {
  display: flex;
  gap: 16px;
  align-items: center;
}

/* clip-grid removed — clip planes are now interactive 3D handles */

#volume3d-controls label { display: flex; align-items: center; gap: 6px; white-space: nowrap; }
#volume3d-controls input[type="range"] { width: 100px; accent-color: #e94560; }

#loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 20px;
  color: #e94560;
  font-size: 0.9em;
}

#loading.hidden { display: none; }

.spinner {
  width: 20px; height: 20px;
  border: 3px solid #333;
  border-top-color: #e94560;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

#load-progress { color: #666; }

.vol-controls-mid {
  display: flex;
  align-items: center;
  gap: 8px;
}

.vol-controls-mid label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.85em;
  color: #ccc;
  cursor: pointer;
}

/* MIP & Crosshair toggles */
.mip-toggle, .crosshair-toggle { display: flex; align-items: center; gap: 4px; cursor: pointer; }
.mip-toggle input, .crosshair-toggle input { accent-color: #e94560; }

/* Histogram */
#histogram-panel {
  background: #16213e;
  border-radius: 8px;
  padding: 4px 8px;
  flex-shrink: 0;
}
#histogram-canvas {
  width: 100%;
  height: 60px;
  display: block;
  border-radius: 4px;
}

/* Bookmarks */

.bookmark-chip {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  background: #0f3460;
  border: 1px solid #333;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85em;
  color: #ccc;
  transition: background 0.2s;
}

.bookmark-chip:hover { background: #1a4a8a; }

.bookmark-chip .bk-name { max-width: 120px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.bookmark-chip .bk-delete {
  background: none;
  border: none;
  color: #e94560;
  cursor: pointer;
  font-size: 1em;
  padding: 0 2px;
  line-height: 1;
}

.bookmark-chip .bk-delete:hover { color: #ff6b81; }

/* Bookmark save modal */
#bookmark-modal {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.6);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

#bookmark-modal.visible { display: flex; }

#bookmark-modal .modal-box {
  background: #16213e;
  border: 1px solid #0f3460;
  border-radius: 8px;
  padding: 20px;
  min-width: 300px;
}

#bookmark-modal h3 { color: #e94560; margin-bottom: 12px; font-size: 1em; }

#bookmark-modal input[type="text"] {
  width: 100%;
  padding: 6px 10px;
  background: #1a1a2e;
  border: 1px solid #333;
  border-radius: 4px;
  color: #e0e0e0;
  font-size: 0.9em;
  margin-bottom: 12px;
}

#bookmark-modal .modal-buttons {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

#bookmark-modal .modal-buttons button {
  padding: 5px 14px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85em;
}

#bookmark-modal .btn-save { background: #e94560; color: #fff; }
#bookmark-modal .btn-cancel { background: #333; color: #ccc; }

/* Canvas wrap needs position relative for overlay */
.canvas-wrap { position: relative; }
.crosshair-overlay {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}