/* Grundlegende Variablen und Reset */
:root {
  --color-primary: #e31b23;
  --color-text: #333333;
  --color-background: #ffffff;
  --color-error: #cc3333;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: Arial, sans-serif;
  color: var(--color-text);
  background-color: var(--color-background);
  line-height: 1.6;
}
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 1rem;
}
header {
  background-color: var(--color-background);
  padding: 1rem 0;
  border-bottom: 1px solid #ddd;
}
header .logo {
  max-height: 60px;
}
h1 {
  margin-bottom: 1rem;
  text-align: center;
}
form fieldset {
  border: 1px solid #ccc;
  padding: 1rem;
  margin-bottom: 1rem;
}
form legend {
  font-weight: bold;
  margin-bottom: 0.5rem;
}
label {
  display: block;
  margin-top: 0.75rem;
}
input[type="text"],
input[type="email"],
input[type="date"],
input[type="url"],
textarea {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid #ccc;
  border-radius: 4px;
  margin-top: 0.25rem;
}
textarea {
  min-height: 100px;
}
.radio-group {
  display: flex;
  gap: 1rem;
  margin-top: 0.5rem;
}
.btn-submit {
  display: block;
  width: 100%;
  padding: 0.75rem;
  background-color: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 4px;
  font-size: 1rem;
  cursor: pointer;
  margin-top: 1rem;
}
.btn-submit:hover {
  background-color: darken(var(--color-primary), 10%);
}
.error {
  border-color: var(--color-error);
}
.error-message {
  color: var(--color-error);
  font-size: 0.875rem;
  margin-top: 0.25rem;
  display: block;
}
footer {
  text-align: center;
  padding: 1rem 0;
  border-top: 1px solid #ddd;
  margin-top: 2rem;
}
footer a {
  color: var(--color-text);
  text-decoration: none;
  margin: 0 0.5rem;
}

/* Responsive */
@media (max-width: 600px) {
  .radio-group {
    flex-direction: column;
  }
}