body {
  font-family: system-ui, sans-serif;
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1rem;
  background: #fafafa;
  color: #111;
}

.lang-input {
  margin-bottom: 1rem;
}

textarea {
  width: 100%;
  font-family: inherit;
  font-size: 1rem;
  box-sizing: border-box;
}

.slide-card {
  border: 1px solid #ccc;
  border-radius: 6px;
  padding: 1rem;
  margin-bottom: 1rem;
  background: #fff;
}

.slide-card textarea {
  margin-bottom: 0.5rem;
  rows: 3;
}

button {
  padding: 0.5rem 1rem;
  font-size: 1rem;
  cursor: pointer;
}