/* General reset */
body, html {
    margin: 0;
    padding: 0;
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #6a11cb, #2575fc);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Container styling */
.container {
    width: 90%;
    max-width: 500px;
    background: #fff;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    text-align: center;
}

.calculator h1 {
    font-size: 2.5rem;
    color: #333;
    margin-bottom: 1rem;
}

.calculator h1 span {
    color: #6a11cb;
}

/* Input box styling */
.input-box {
    margin-top: 1rem;
    margin-bottom: 1rem;
}

.input-box label {
    display: block;
    font-size: 1rem;
    color: #555;
    margin-bottom: 0.5rem;
}

.input-box input {
    width: 100%;
    padding: 0.8rem;
    font-size: 1rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    margin-bottom: 1rem;
    transition: 0.3s ease;
}

.input-box input:focus {
    border: 1px solid #6a11cb;
    outline: none;
    box-shadow: 0 0 8px rgba(106, 17, 203, 0.5);
}

.input-box button {
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    background: #6a11cb;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: 0.3s ease;
}

.input-box button:hover {
    background: #2575fc;
    box-shadow: 0 4px 10px rgba(37, 117, 252, 0.4);
}

/* Result styling */
#result {
    font-size: 1.2rem;
    color: #333;
    margin-top: 1rem;
}

#result strong {
    color: #6a11cb;
}

#result .error {
    color: #eaaeae;
    font-weight: bold;
}