/* インラインスタイル（必要に応じてstyle.cssに移動） */
body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.login-container {
    background: #fff;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    width: 100%;
    max-width: 400px;
    padding: 20px;
    box-sizing: border-box;
}

.login-header {
    text-align: center;
    margin-bottom: 20px;
}

.login-header h1 {
    font-size: 24px;
    color: #333;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: #555;
}

.form-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
}

.btn-login {
    width: 100%;
    padding: 10px;
    background-color: #007bff;
    border: none;
    color: white;
    font-weight: bold;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.btn-login:hover {
    background-color: #0056b3;
}

.extra-links {
    text-align: center;
    margin-top: 15px;
}

.extra-links a {
    color: #007bff;
    text-decoration: none;
}

.extra-links a:hover {
    text-decoration: underline;
}