@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap');

body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    background: linear-gradient(135deg, rgba(17, 17, 37, 0.8) 0%, rgba(39, 39, 69, 0.8) 100%), url('background-image.jpg') no-repeat center center fixed;
    background-size: cover;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.calculator-container {
    background: rgba(0, 0, 0, 0.7);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.7);
    max-width: 500px;
    width: 90%;
    text-align: center;
    animation: fadeIn 1.5s ease-in-out;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: #61dafb;
    text-shadow: 0 4px 6px rgba(0, 0, 0, 0.4);
}

.calculator-form {
    display: flex;
    flex-direction: column;
}

.label {
    text-align: left;
    margin-bottom: 10px;
}

.input-field {
    padding: 10px;
    margin-bottom: 20px;
    border-radius: 5px;
    border: 1px solid #ddd;
    font-size: 1rem;
    background-color: #222;
    color: #fff;
}

.input-field:focus {
    border-color: #61dafb;
    outline: none;
}

.calculate-button {
    background-color: #61dafb;
    border: none;
    padding: 15px;
    border-radius: 5px;
    color: #fff;
    font-size: 1.2rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.calculate-button:hover {
    background-color: #21a1f1;
}

.result-display {
    margin-top: 20px;
    padding: 20px;
    background-color: #333;
    border-radius: 5px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

@keyframes fadeIn {
    0% { opacity: 0; }
    100% { opacity: 1; }
}

@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    .calculator-container {
        padding: 20px;
    }
}