body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Helvetica, Arial;
  background: #0b1020;
  color: #e6e8ee;
  line-height: 1.5;
}
header {
  text-align: center;
  padding: 24px 16px 8px;
}
h1 {
  margin: 0;
}
.subtitle {
  color: #9aa3b2;
}
.container {
  max-width: 900px;
  margin: 20px auto;
  padding: 0 16px;
}
textarea {
  width: 100%;
  min-height: 200px;
  background: #111527;
  color: #e6e8ee;
  border: 1px solid #243046;
  border-radius: 8px;
  padding: 10px;
  resize: vertical;
  font-family: monospace;
}
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 10px;
  align-items: center;
}
button {
  border: 1px solid #243046;
  background: #1a2236;
  color: #e6e8ee;
  padding: 10px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
}
button:hover {
  background: #243046;
}
.danger {
  border-color: #ef4444;
}
.hint {
  color: #9aa3b2;
  font-size: 0.9rem;
  margin-top: 8px;
}
.checkbox {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  color: #e6e8ee;
}
footer {
  text-align: center;
  color: #9aa3b2;
  font-size: 0.85rem;
  margin: 20px 0;
}