.panel-login { max-width: 360px; margin-top: 80px; }
.campo-clave {
  position: relative;
  display: flex;
}
.campo-clave input {
  flex: 1;
  padding-right: 40px;
}
#btnOjo {
  position: absolute;
  right: 4px;
  top: 4px;
  bottom: 4px;
  width: 34px;
  margin: 0;
  padding: 0;
  background: transparent;
  color: #94a3b8;
  display: flex;
  align-items: center;
  justify-content: center;
}
#btnOjo:hover { background: transparent; color: #e2e8f0; }
.error {
  color: #f87171;
  font-size: 13px;
  margin: 8px 0 0;
}
.error.oculto { display: none; }