body {
  margin: 0; min-height: 100vh; display: grid; place-items: center;
  font: 14px/1.45 "Segoe UI", Tahoma, sans-serif; color: #1b1b1b;
  background: linear-gradient(140deg, #eef3f8, #dfe7ef);
}
.karte {
  background: #fff; padding: 26px 28px; border-radius: 8px; width: min(360px, 92vw);
  box-shadow: 0 12px 40px rgba(0,0,0,.13); display: flex; flex-direction: column; gap: 12px;
}
.kopf { display: flex; align-items: center; gap: 9px; font-size: 19px; font-weight: 600; }
.logo { width: 26px; height: 26px; border-radius: 5px; background: #2f7d32; color: #fff; display: grid; place-items: center; font-size: 16px; }
.text { margin: 0; color: #555; }
label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: #444; }
input { height: 34px; padding: 0 9px; border: 1px solid #c3c3c3; border-radius: 4px; font: inherit; }
input:focus { outline: 2px solid #2b6cb0; outline-offset: -1px; border-color: #2b6cb0; }
button { height: 36px; border: 0; border-radius: 4px; background: #2b6cb0; color: #fff; font: inherit; font-weight: 600; cursor: pointer; }
button:hover { background: #24578c; }
.fehler { background: #fde8e8; border: 1px solid #f3b9b9; color: #8b1a1a; padding: 7px 9px; border-radius: 4px; font-size: 13px; }