/* --- Original Styles (Refactored) --- */
body {
  font-family: sans-serif;
  margin: 0;
  background-color: var(--page-bg);
  color: var(--page-text);
  transition: background-color 0.3s, color 0.3s;
}

.toolbar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  background: var(--toolbar-bg);
  color: var(--toolbar-text);
  padding: 10px;
  transition: background-color 0.3s;
}

input[type="file"] {
  padding: 5px;
}

button {
  padding: 6px 12px;
  border: none;
  background: var(--button-bg);
  color: white;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.2s;
}

button:hover {
  background: var(--button-hover-bg);
}

.pdf-container {
  display: flex;
  justify-content: center;
  padding: 20px;
}

canvas {
  /* This styling is now applied to the canvas element itself */
  border: 1px solid var(--canvas-border);
  background: var(--canvas-bg);
  display: block; /* Important for layout */
  transition: background-color 0.3s, border-color 0.3s, filter 0.3s;
}

/* --- New PDF Wrapper & Text Layer Styles --- */

/* This wrapper is the new positioning context for the 
  canvas and the text layer.
*/
#pdf-viewport-wrapper {
  position: relative;
  border-radius: 8px; /* Apply border radius to the wrapper */
  overflow: hidden; /* Ensures filter clips properly */
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  line-height: 1; /* Fixes layout issues */
}

/* The .textLayer class comes from pdf.js.
  These rules place it directly on top of the canvas.
*/
.textLayer {
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  color: transparent; /* Text is invisible, but selectable */
  transition: filter 0.3s;
}

/* --- New Decoupled PDF Dark Mode Class --- */

/* This class is toggled by JS and is independent 
  of the main body.dark-mode theme.
  It targets both the canvas AND the text layer.
*/
#pdf-viewport-wrapper.pdf-dark-mode canvas,
#pdf-viewport-wrapper.pdf-dark-mode .textLayer {
  filter: invert(1) hue-rotate(180deg);
}

/* --- Custom Context Menu Styles --- */
.context-menu {
  display: none; /* Hidden by default */
  position: absolute;
  z-index: 1000;
  background-color: var(--chat-window-bg);
  border: 1px solid var(--canvas-border);
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  overflow: hidden;
  padding: 5px 0;
}

.menu-button {
  display: block;
  width: 100%;
  padding: 8px 15px;
  background: none;
  border: none;
  color: var(--page-text);
  text-align: left;
  cursor: pointer;
  white-space: nowrap;
}

.menu-button:hover {
  background-color: var(--chat-message-bot-bg);
}