html,
body {
  height: 100%;
  margin: 0;
}

body {
  display: flex;
  flex-direction: column;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: #1c1e21;
  background: #f0f2f5;
  box-sizing: border-box;
}

header {
  background: #ffffff;
  padding: 6px 10px;
  border-bottom: 1px solid #ddd;
}

header h1 {
  margin: 0;
  font-size: 1.25rem;
}

.header-desc {
  margin: 2px 0 0;
  font-size: 0.85rem;
  color: #4b4f56;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding: 8px 10px;
  background: #ffffff;
  border-bottom: 1px solid #ddd;
  font-size: 0.85rem;
}

.controls label {
  display: flex;
  align-items: center;
  gap: 6px;
}

.mime-label {
  flex: 1;
  min-width: 280px;
}

#mime_type {
  flex: 1;
  padding: 4px 6px;
  font-family: monospace;
  font-size: 13px;
  border: 1px solid #bbb;
}

#file_summary {
  color: #4b4f56;
  font-family: monospace;
  font-size: 12px;
}

.workspace {
  flex: 1;
  min-height: 0;
  display: flex;
  padding: 8px;
  box-sizing: border-box;
}

#output {
  flex: 1;
  min-width: 0;
  margin: 0;
  padding: 8px;
  overflow: auto;
  white-space: pre;
  background: #ffffff;
  border: 1px solid #bbb;
  box-sizing: border-box;
  font-family: monospace;
  font-size: 13px;
  line-height: 18px;
}

#output.error {
  border: 2px solid red;
}

#output.valid {
  border: 2px solid green;
}