* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', sans-serif;
    background-color: #2c3e50;
    color: #ecf0f1;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    text-align: center;
    background-color: #34495e;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    width: 400px;
}

h1 {
    font-size: 24px;
    margin-bottom: 10px;
}

p {
    margin-bottom: 20px;
    font-size: 16px;
}

.input-section {
    margin-bottom: 20px;
}

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

textarea, input[type="text"] {
    width: 100%;
    padding: 10px;
    background-color: #1c2833;
    border: 1px solid #7f8c8d;
    color: #ecf0f1;
    border-radius: 5px;
    font-size: 14px;
    margin-bottom: 10px;
}

textarea:focus, input[type="text"]:focus {
    outline: none;
    border-color: #3498db;
}

textarea[readonly] {
    background-color: #2c3e50;
    color: #bdc3c7;
    border-color: #7f8c8d;
    cursor: not-allowed;
}

textarea.error {
    background-color: #e74c3c;
    color: white;
    border: 2px solid #c0392b;
}

.btn {
    background-color: #2980b9;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.btn:hover {
    background-color: #3498db;
}

.explanation {
    background-color: #1c2833;
    padding: 10px;
    border-radius: 5px;
    margin-bottom: 20px;
    color: #bdc3c7;
    font-size: 14px;
    white-space: pre-line
}

.explanation strong {
    color: #ecf0f1;
    font-size: 16px;
    display: block;
}