* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(to bottom right, #43cea2, #185a9d);
    color: #ffffff;
    background-size: 800% 800%;
    animation: color-transition 6s infinite;
}

@keyframes color-transition {
    0% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

.calculator {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 20px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
    padding: 40px;
    max-width: 400px;
    width: 100%;
    text-align: center;
    color: #333333;
}

.calculator h1 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: #185a9d;
    font-weight: bold;
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 10px;
    text-align: left;
    color: #185a9d;
}

.input-group input {
    width: 100%;
    padding: 12px;
    border: 2px solid #43cea2;
    border-radius: 8px;
    font-size: 1rem;
    outline: none;
    transition: 0.3s;
}

.input-group input:focus {
    border-color: #185a9d;
    box-shadow: 0 0 8px rgba(67, 206, 162, 0.5);
}

button {
    background: linear-gradient(to right, #43cea2, #185a9d);
    color: #ffffff;
    border: none;
    padding: 12px 25px;
    font-size: 1rem;
    border-radius: 50px;
    cursor: pointer;
    transition: transform 0.3s ease, background 0.3s ease;
}

button:hover {
    transform: scale(1.05);
    background: linear-gradient(to right, #185a9d, #43cea2);
}

.result {
    margin-top: 20px;
    font-size: 1.4rem;
    font-weight: bold;
    color: #185a9d;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}