/* Updated layout: centered, larger container, improved inputs */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(125deg, #5cada2 0%, #f4f6f8 100%);
}

#container {
    width: min(560px, 92%);
    padding: 28px;
    margin: 0; /* centered by body flex */
    background-color: #ffffff;
    border: 1px solid rgba(2,6,23,0.06);
    border-radius: 14px;
    box-shadow: 0 12px 30px rgba(2,6,23,0.08);
}

label {
    display: block;
    font-size: 14px;
    color: #334155;
    font-weight: 600;
    margin-bottom: 6px;
}

input[type="number"] {
    width: 95%;
    padding: 10px 12px;
    margin-bottom: 14px;
    border-radius: 10px;
    border: 1px solid #e6eef8;
    background: linear-gradient(180deg, #fff, #fbfdff);
    box-shadow: inset 0 1px 0 rgba(0,0,0,0.02);
}

button {
    width: 100%;
    padding: 12px;
    background: linear-gradient(90deg, #45b96a, #06b6d4);
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 700;
    transition: transform .18s ease, box-shadow .18s ease;
}

button:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 30px rgba(124,58,237,0.14);
}

/* small responsive tweaks */
@media (max-width:420px){
    #container{padding:18px}
    label{font-size:13px}
}