:root { --blau:#003C7E; --rand:#DDE3EA; --grau:#5B6672; --text:#1A2129; }
  * { box-sizing:border-box; }
  body { margin:0; font-family:system-ui,-apple-system,"Segoe UI",sans-serif; color:var(--text);
         background:#F4F6F9; min-height:100vh; display:flex; flex-direction:column; }
  header { background:var(--blau); color:#fff; padding:40px 24px 28px; }
  header b { display:block; font-size:19px; }
  header span { font-size:11px; letter-spacing:.6px; text-transform:uppercase; color:#BBD3E8; }
  main { flex:1; padding:28px 24px; max-width:560px; }
  h1 { font-size:21px; margin:0 0 10px; }
  p { font-size:15px; line-height:1.55; color:#3C4854; margin:0 0 14px; }
  .kasten { background:#fff; border:1px solid var(--rand); border-radius:12px; padding:16px; }
  footer { padding:18px 24px 28px; border-top:1px solid var(--rand); font-size:12px; color:var(--grau); }
  a { color:#0069B4; }