body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #0f172a;

    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

/* CARD */
.card {
    background: #e5e7eb;
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    width: 300px;
}

/* NUMBERS */
h2 {
    font-size: 28px;
    margin-bottom: 20px;
}

/* BUTTON ROW */
.btn-row {
    display: flex;
    justify-content: space-between;
    gap: 10px;
}

/* CENTER BUTTON */
.btn-center {
    margin: 12px 0;
}

/* BUTTON STYLE */
button {
    padding: 8px 12px;
    border: 2px solid black;
    background: white;
    font-weight: bold;
    cursor: pointer;
    transition: 0.2s;
}

/* HOVER */
button:hover {
    transform: scale(1.05);
    background: #d1d5db;
}

/* CLICK EFFECT */
button:active {
    transform: scale(0.95);
}

/* RESULT TEXT */
p {
    margin: 5px 0;
    font-weight: bold;
}
/* INPUT CONTAINER */
.inputs {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 20px;
}

/* INPUT BOX */
input {
    width: 130px;
    padding: 10px;
    border: 2px solid #ccc;
    border-radius: 8px;

    font-size: 16px;
    text-align: center;
    font-weight: bold;

    outline: none;
    transition: 0.2s;
}

/* FOCUS (when user clicks) */
input:focus {
    border-color: #2563eb;
    box-shadow: 0 0 8px rgba(37, 99, 235, 0.4);
}

/* HOVER */
input:hover {
    border-color: #888;
}