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

body {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #121212;
    font-family: 'Arial', sans-serif;
}

.vat-calc {
    background-color: #1e1e1e;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
    width: 400px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.vat-calc:hover {
    transform: scale(1.02);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.5);
}

h2 {
    color: #e0e0e0;
    margin-bottom: 1.5rem;
    font-size: 2rem;
    font-weight: 700;
    text-transform: uppercase;
    background: linear-gradient(45deg, #42a5f5, #64b5f6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
}

.main-wrapper {
    margin-bottom: 1.5rem;
}

form div {
    margin-bottom: 1.2rem;
}

form label {
    display: block;
    margin-bottom: 0.5rem;
    color: #bdbdbd;
    font-size: 1rem;
    font-weight: 500;
}

form input {
    width: 100%;
    padding: 0.8rem;
    border-radius: 5px;
    border: 1px solid #424242;
    background-color: #333333;
    color: #e0e0e0;
    font-size: 1rem;
    transition: border-color 0.3s ease, background-color 0.3s ease;
}

form input:focus {
    border-color: #64b5f6;
    background-color: #424242;
    outline: none;
}

form input[disabled] {
    background-color: #424242;
    color: #9e9e9e;
}

.button_group {
    display: flex;
    justify-content: space-between;
    margin-top: 1.5rem;
}

.main-btn {
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 25px;
    background: linear-gradient(135deg, #6d83f2, #42a5f5);
    color: #ffffff;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
}

.main-btn:hover {
    background: linear-gradient(135deg, #42a5f5, #1e88e5);
    transform: scale(1.05);
    box-shadow: 0 4px 10px rgba(66, 165, 245, 0.4);
}

.main-btn:active {
    background: linear-gradient(135deg, #1e88e5, #1976d2);
    transform: scale(1);
}