.ri-card {
    max-width: 800px;
    margin: 30px auto;
    padding: 25px;
    border: 1px solid #ddd;
    border-radius: 12px;
    background: #fff;
}

.ri-field {
    margin-bottom: 15px;
}

.ri-field label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
}

.ri-field input {
    width: 100%;
    padding: 10px;
}

#ri-calculate-btn {
    padding: 12px 20px;
    cursor: pointer;
}

#ri-result {
    margin-top: 25px;
}