.calculator-container {
    width: 100%;
    max-width: 520px;
    margin: 40px auto;
    padding: 32px 36px;
    background: #ffffff;
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(20, 28, 50, 0.10);
    border: 1px solid #e8edf8;
    box-sizing: border-box;
}

.calculator-container h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1e2330;
    margin: 0 0 24px;
    text-align: center;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: #374151;
    margin-bottom: 6px;
}

.calculator-container select {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid #d1d9e8;
    border-radius: 10px;
    font-size: 15px;
    background: #f9fafc;
    color: #1e2330;
    appearance: none;
    cursor: pointer;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    box-sizing: border-box;
}

.calculator-container select:focus {
    outline: none;
    border-color: #17a5df;
    box-shadow: 0 0 0 3px rgba(23, 165, 223, 0.15);
    background: #fff;
}

.calculator-container button[type="submit"],
.calculator-container button {
    display: block;
    width: 100%;
    padding: 12px;
    background: linear-gradient(120deg, #17a5df, #e3008c);
    color: #fff;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 8px;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.calculator-container button:hover {
    opacity: 0.92;
    transform: translateY(-1px);
    background: linear-gradient(120deg, #17a5df, #e3008c);
}

#price {
    margin-top: 20px;
    padding: 16px;
    background: #f3f8ff;
    border: 1px solid #d1e0f5;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    color: #1e2330;
    text-align: center;
}

.price-value {
    color: #17a5df;
    font-size: 1.3rem;
    margin-left: 8px;
}

@media (max-width: 600px) {
    .calculator-container {
        margin: 20px 16px;
        padding: 22px 18px;
    }
}