body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background: #f4f8ff;
    color: #222;
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

h2 {
    margin: 44px 0 28px 0;
    font-size: 2.3em;
    color: #1565c0;
    letter-spacing: 2px;
    font-weight: 700;
    text-shadow: 0 2px 8px #d5e5fc;
}

.converter-block {
    background: #fff;
    padding: 40px 35px 32px 35px;
    border-radius: 3%;
    box-shadow: 0 2px 20px #8ab7f033, 0 1px 1px #000;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 40px;
    min-width: 350px;
}

label {
    font-size: 1.18em;
    color: #333;
    font-weight: 500;
    margin-bottom: 8px;
}

input[type="number"] {
    font-size: 1.35em;
    padding: 10px 18px;
    border: 1.5px solid #90caf9;
    margin: 12px 0 20px 0;
    width: 180px;
    text-align: right;
    background: #e3f2fd;
    color: #234;
    outline: none;
    transition: border 0.18s, box-shadow 0.18s;
    box-shadow: 0 2px 8px #b9d5ee33;
}
input[type="number"]:focus {
    border-color: #1976d2;
    box-shadow: 0 4px 16px #1565c040;
}

select {
    font-size: 1.20em;
    padding: 8px 15px;
    border-radius: 0;
    border: 1.7px solid #90caf9;
    background: #fff;
    color: #1565c0;
    margin: 0 8px;
    outline: none;
    transition: border 0.17s, box-shadow 0.17s;
    box-shadow: 0 2px 8px #b9d5ee22;
}
select:focus {
    border-color: #1976d2;
    box-shadow: 0 4px 16px #1565c028;
}

button {
    margin: 24px 0 0 0;
    background: #3b4cca;
    color: #fff;
    border: none;
    padding: 13px 38px;
    border-radius: 0;
    font-size: 1.3em;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 3px 14px #e6e8ff77, 0 1.5px 0 #3b4cca40;
    letter-spacing: 1px;
    transition: background 0.18s, color 0.18s, box-shadow 0.18s;
}
button:hover {
    background: #ffcb05;
    color: #3b4cca;
    box-shadow: 0 6px 22px #ffcb0533;
}

#vastus {
    margin-top: 32px;
    padding: 18px 32px;
    background: #e3f2fd;
    color: #1967c0;
    border-radius: 0;
    font-size: 2.1em;
    font-weight: bold;
    min-width: 330px;
    text-align: center;
    box-shadow: 0 2px 14px #aecbef44;
}