/* Overall page layout */
body {
    font-family: Arial, sans-serif;
    background: #f2f4f7;
    margin: 0;
    padding: 40px;
    display: flex;
    flex-direction: column;   /* stack vertically */
    align-items: center;      /* center horizontally */
}

/* Title */
h1 {
    margin-bottom: 20px;
    color: #333;
}

/* Form container */
form {
    display: flex;
    flex-direction: column;   /* stack inputs vertically */
    gap: 15px;                /* spacing between rows */
    background: white;
    padding: 25px 30px;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    width: 320px;
}

/* Labels + inputs */
h4 {
    display: flex;
    flex-direction: column;   /* label above input */
    font-weight: 500;
    color: #444;
    margin: 0;
}

/* Inputs */
input[type="number"] {
    width: 100%;
    padding: 10px;
    margin-top: 6px;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 16px;
    box-sizing: border-box;
}

input[disabled] {
    background: #e9ecef;
    color: #555;
}

/* Button at bottom */
button {
    margin-top: 20px;
    width: 320px;
    padding: 12px;
    background: #848c96;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.2s ease;
}

button:hover {
    background: #9ba4ad;
}