body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #2c3e50; 
    color: #ecf0f1; 
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px 20px;
    min-height: 100vh;
    margin: 0;
    box-sizing: border-box;
}

.container {
    background-color: #34495e; 
    padding: 30px 40px;
    border-radius: 10px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.5); 
    width: 100%;
    max-width: 500px;
    border: 1px solid #2980b9;
}

h1 {
    text-align: center;
    color: #f1c40f; 
    margin-bottom: 25px;
    border-bottom: 3px solid #f39c12;
    padding-bottom: 10px;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: #ecf0f1; 
}

.simple-form input[type="text"],
.simple-form input[type="email"],
.simple-form select,
.simple-form textarea {
    width: 100%;
    padding: 12px;
    background-color: #2c3e50; 
    color: #ecf0f1; 
    border: 1px solid #7f8c8d;
    border-radius: 5px;
    box-sizing: border-box;
    font-size: 16px;
    transition: border-color 0.3s;
}

.simple-form input:focus,
.simple-form select:focus,
.simple-form textarea:focus {
    border-color: #3498db; 
    outline: none;
    box-shadow: 0 0 8px rgba(52, 152, 219, 0.7);
}

.simple-form select option {
    background-color: #34495e;
    color: #ecf0f1;
}

.checkbox-group {
    display: flex;
    align-items: center;
    margin-top: 10px;
}

.checkbox-group label {
    display: inline;
    font-weight: normal;
    margin-left: 8px;
    margin-bottom: 0;
    cursor: pointer;
    color: #bdc3c7; 
}

.submit-button {
    width: 100%;
    padding: 15px;
    background-color: #27ae60;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.submit-button:hover {
    background-color: #2ecc71;
}