body {
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    max-width: 600px;
    text-align: center;
    display: flex;
    flex-direction: column;
    margin: 40px auto;
    padding: 40px;
    background: #f8f9fa;
    border-radius: 30px;
    box-shadow: 4px 4px 12px rgb(0, 0, 0.1);
}

h2 {
    color: #2c3e50;
    margin-top: 0;
    margin-bottom: 0px;
}

p {
    color: #555;
    margin: 0 auto 35px auto;
    font-size: medium;
}

label {
    text-align: start;
    margin: 15px 0 5px;
    font-weight: 600;
    color: #2c3e50;
    font-size: 1em;
}

input {
    width: 100%;
    border: 2px solid #dce4ec;
    border-radius: 6px;
    padding: 8px;
    box-sizing: border-box;
    transition: border 0.2s;
    font-size: 1em;
}

input:focus {
    border-color: darkcyan;
    outline: 0;
}

button {
    display: block;
    width: 100%;
    padding: 12px;
    margin: 25px 0 20px;
    background: #3498db;
    color: white;
    border: none;
    font-weight: bold;
    font-size: 1.2em;
    border-radius: 6px;
    cursor: pointer;
}

button:hover {
    background: #2980b9;
}

.result-box {
    padding: 20px;
    border-radius: 8px;
    border-left: 5px solid #3498db;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.result-line {
    font-size: 1.2em;
    margin: 10px 0;
    word-wrap: break-word;
}

.error {
            color: #e74c3c;
            font-weight: bold;
}