* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Arial, sans-serif;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
header, footer {
  background: #333;
  color: #fff;
  padding: 10px 16px;
  text-align: center;
}
.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  background: #f4f4f4;
  border-bottom: 1px solid #ddd;
}
.controls button, .controls select, #pdfSelect {
  padding: 6px 10px;
  font-size: 14px;
}
.viewer {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #111;
}
#pdfCanvas {
  width: 95%;
  height: auto;           /* let JS set the right scale */
  max-height: 95vh;
  background: #222;
  border: 1px solid #333;
}

#pageIndicator {
  margin-left: 20px;
  font-weight: bold;
  color: #333;
}