.sitc-container {
    max-width: 450px;
    margin: 30px auto;
    padding: 20px;
    background: #fdfdfd;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
.sitc-container h3 {
    text-align: center;
    margin-bottom: 20px;
}
.sitc-container input, .sitc-container select, .sitc-container button {
    width: 100%;
    padding: 10px;
    margin: 8px 0;
    font-size: 16px;
}
.sitc-container button {
    background-color: #0073aa;
    color: white;
    border: none;
    cursor: pointer;
}
.sitc-container #sitc_result {
    margin-top: 20px;
    font-size: 16px;
    background: #e8f7e4;
    padding: 10px;
    border-radius: 6px;
}