body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f5f5f5;
}

.container {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

input[type="url"],
input[type="email"],
input[type="tel"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

button {
    background: #4CAF50;
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    width: 100%;
}

button:hover {
    background: #45a049;
}

.test-result {
    background: #f9f9f9;
    padding: 15px;
    margin-bottom: 15px;
    border-left: 4px solid #ddd;
    border-radius: 4px;
}

.good {
    color: #4CAF50;
    font-weight: bold;
}

.warning {
    color: #f44336;
    font-weight: bold;
}

.test-result .good {
    border-left-color: #4CAF50;
}

.test-result .warning {
    border-left-color: #f44336;
}