body {
    font-family: Arial, sans-serif;
    background-color: #f4f7f6;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    background: #fff;
    padding: 20px 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
}

h2 {
    text-align: center;
    color: #333;
    margin-bottom: 20px;
}

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

.input-group label {
    display: block;
    margin-bottom: 5px;
    color: #666;
    font-size: 14px;
}

.input-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
    font-size: 16px;
}

button {
    width: 100%;
    padding: 10px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s;
}

button:hover {
    background-color: #0056b3;
}

.result-box {
    margin-top: 20px;
    padding: 15px;
    border: 1px solid #d1e7dd;
    background-color: #d1e7dd;
    color: #0f5132;
    border-radius: 4px;
}

.result-box.error {
    border-color: #f8d7da;
    background-color: #f8d7da;
    color: #842029;
}

.hidden {
    display: none;
}

#loading {
    margin-top: 15px;
    text-align: center;
    color: #666;
    font-style: italic;
}