body {
  font-family: sans-serif;
  background-color: #f2f5f9;
  padding: 2rem;
  margin: 0;
}

h1 {
  text-align: center;
  color: #333;
}
.register-warning {
    max-width: 600px;
    margin: 20px auto;
    padding: 15px 20px;
    background-color: #fdfdfd;
    border: 2px solid #f39c12;
    border-radius: 5px;
    text-align: center;
    font-size: 0.9rem; /*小さくして読みやすく */
    color: #333;
    line-height: 1.6;
}

.register-warning strong {
    font-weight: 600;
}

.warning-title {
    color: #d35400;
    font-weight: bold;
    margin-bottom: 10px;
    font-size: 1.1em;
}

.warning-text {
    color: #444;
    line-height: 1.6;
    font-size: 0.95em;
}
form {
  background-color: #ffffff;
  padding: 2rem;
  max-width: 500px;
  margin: 2rem auto;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

form input[type="text"],
form input[type="password"],
form input[type="number"],
form select {
  width: 100%;
  padding: 0.75rem;
  margin-bottom: 1.2rem;
  border: 1px solid #ccc;
  border-radius: 4px;
  font-size: 1rem;
  box-sizing: border-box;
}

form button {
  width: 100%;
  padding: 0.75rem;
  background-color: #28a745;
  border: none;
  color: white;
  font-size: 1rem;
  border-radius: 4px;
  cursor: pointer;
}

form button:hover {
  background-color: #218838;
}

a {
  display: block;
  text-align: center;
  margin-top: 1rem;
  color: #007bff;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

p[style*="color:red"] {
  text-align: center;
  margin-top: 1rem;
  font-weight: bold;
}