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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

.card {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    margin: 20px 0;
}

.button {
    background: #007bff;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}

.button:hover {
    background: #0056b3;
}

.button:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.response {
    margin-top: 20px;
    padding: 15px;
    border-left: 4px solid #007bff;
    background: #f8f9fa;
}

h1 {
    color: #2c3e50;
    margin-bottom: 20px;
}

h2 {
    color: #34495e;
    margin-bottom: 15px;
}