body { margin:0; min-height:100vh; display:flex; align-items:center; justify-content:center;
       background:#eef2f6; color:#1b2430; font:15px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif; }
.karte { background:#fff; border:1px solid #dde3ea; border-radius:12px; padding:28px 26px; width:min(380px, calc(100vw - 32px));
         box-shadow:0 6px 24px rgba(20,40,70,.08); }
h1 { margin:0 0 4px; font-size:20px; color:#1d3557; }
p.unter { margin:0 0 18px; font-size:13px; color:#6b7785; }
label { display:block; font-size:13px; margin-bottom:4px; }
input { width:100%; padding:10px 12px; border:1px solid #d5dce4; border-radius:8px; font:inherit; margin-bottom:14px; box-sizing:border-box; }
button { width:100%; border:none; border-radius:8px; padding:11px; font-size:15px; background:#1d3557; color:#fff; cursor:pointer; }
button:disabled { opacity:.6; cursor:default; }
.fehler { background:#fdecea; color:#96271b; padding:10px 12px; border-radius:8px; font-size:14px; margin-bottom:14px; }
.hinweis { margin:16px 0 0; font-size:12px; color:#6b7785; }