.calculator-container {
    max-width: 600px;
    margin: 20px auto;
    padding: 20px;
    font-family: Arial, sans-serif;
    background-color: #f8f9fa;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.calculator-section {
    margin-bottom: 25px;
    padding: 15px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

h3 {
    color: #444;
    margin-bottom: 15px;
    font-size: 1.1em;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

input[type="number"] {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    transition: border-color 0.3s;
}

input[type="number"]:focus {
    outline: none;
    border-color: #4a90e2;
}

button {
    padding: 10px 20px;
    background-color: #4a90e2;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #357abd;
}

.result {
    margin-top: 10px;
    padding: 10px;
    background-color: #f0f7ff;
    border-radius: 4px;
    color: #333;
    font-weight: 500;
    min-height: 20px;
}

@media (max-width: 480px) {
    .calculator-container {
        margin: 10px;
        padding: 15px;
    }
    
    .calculator-section {
        padding: 10px;
    }
}

.calculator-description {
    max-width: 700px;
    margin: 30px auto 20px auto;
    padding: 20px;
    background: #f3f3f3;
    border-radius: 10px;
    box-shadow: 0 1px 6px rgba(0,0,0,0.06);
}

.calculator-heading h2 {
    margin: 0 0 15px 0;
    text-align: center;
    color: #2d2d2d;
}

.description-text {
    color: #444;
    font-size: 1em;
    line-height: 1.6;
}

.description-text ul {
    margin: 10px 0 10px 20px;
    padding-left: 20px;
}

.description-text li {
    margin-bottom: 6px;
}

.calculator-container.single {
    max-width: 600px;
    margin: 30px auto;
    padding: 30px 20px;
    background: #efefef;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.07);
    display: flex;
    flex-direction: column;
    align-items: stretch;
}

.label {
    margin: 10px 0 5px 0;
    font-size: 1.1em;
    color: #333;
    font-weight: 500;
}

.input {
    padding: 10px;
    font-size: 1.1em;
    border: 1px solid #bbb;
    border-radius: 4px;
    margin-bottom: 10px;
    background: #fff;
}

.calculate-btn {
    margin: 20px auto 20px auto;
    padding: 15px 0;
    width: 60%;
    background: #4caf50;
    color: #fff;
    font-size: 1.2em;
    font-weight: bold;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.2s;
    display: block;
}

.calculate-btn:hover {
    background: #388e3c;
}

@media (max-width: 600px) {
    .calculator-container.single {
        padding: 15px 5px;
    }
    .calculate-btn {
        width: 100%;
    }
}