:root {
  --papier: #fbfaf7;
  --tinte: #1a1d21;
  --grau: #676c74;
  --linie: #e5e2da;
  --akzent: #1a1d21;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, 'Segoe UI', Roboto, sans-serif;
  background: var(--papier);
  color: var(--tinte);
  line-height: 1.6;
}
#app { max-width: 640px; margin: 0 auto; padding: 3rem 1.5rem; }
h1 { font-size: 1.9rem; letter-spacing: -0.02em; margin-bottom: 1rem; }
.unterzeile { color: var(--grau); margin-bottom: 2rem; }
label { display: block; font-weight: 600; margin: 1.4rem 0 0.4rem; font-size: 0.95rem; }
.hinweis { font-weight: 400; color: var(--grau); font-size: 0.85rem; margin-top: 2px; }
input[type=text], input[type=email], textarea, select {
  width: 100%; padding: 0.7rem 0.9rem; border: 1px solid var(--linie);
  border-radius: 6px; font: inherit; background: #fff;
}
input:focus, textarea:focus, select:focus { outline: 2px solid var(--tinte); outline-offset: 1px; }
textarea { min-height: 100px; resize: vertical; }
.knopf {
  display: inline-block; margin-top: 1.8rem; padding: 0.85rem 1.8rem;
  background: var(--akzent); color: var(--papier); border: none; border-radius: 6px;
  font: inherit; font-weight: 600; cursor: pointer;
}
.knopf:disabled { opacity: 0.45; cursor: not-allowed; }
.knopf:hover:not(:disabled) { background: #33373d; }
.fortschritt {
  display: flex; gap: 6px; margin-bottom: 2rem;
}
.fortschritt span {
  height: 4px; flex: 1; background: var(--linie); border-radius: 2px;
}
.fortschritt span.aktiv { background: var(--tinte); }
.status { margin-top: 1rem; font-size: 0.9rem; color: var(--grau); }
.status.fehler { color: #c8372d; }
@media (max-width: 480px) {
  #app { padding: 2rem 1.1rem; }
  h1 { font-size: 1.5rem; }
}

.checkbox-zeile {
  display: flex; align-items: center; gap: 0.5rem;
  font-weight: 400; margin: 0.3rem 0;
  cursor: pointer;
}
.checkbox-zeile input[type=checkbox] { width: auto; }