.kalkulator-box {
    max-width: 420px;
    padding: 16px;
    border: 1px solid #ddd;
    background: #f2f8fd63;
    margin: 20px auto 20px;
}

.kalkulator-box label {
    display: block;
    margin-top: 10px;
}

.kalkulator-box input,
.kalkulator-box select {
    width: 100%;
    padding: 9px 6px;
    font-size: 17px;
    box-sizing: border-box;
}

.kalkulator-box input[type="checkbox"] {
    width: auto;
    margin-right: 6px;
    vertical-align: middle;
}

.kalkulator-box button {
    margin-top: 20px;
    background: #595959;
    color: #fff;
    border: none;
    padding: 12px 0;
    width: 100%;
    text-transform: uppercase;
    border: 1px solid #595959;
    cursor: pointer;
    transition: background 0.3s ease;
}

.kalkulator-box button:hover {background: #fff; color: #595959;}

.kalkulator-result {
    margin-top: 12px;
    font-weight: bold;
}

small {color: #333;}

.kalkulator-box *,
.kalkulator-box *::before,
.kalkulator-box *::after {
    box-sizing: border-box;
}

/* =========================
   ELKA CALCULATOR
========================= */

#kalkulator_elka .display {
    width: 100%;
    font-size: 24px;
    padding: 10px;
    text-align: right;
    margin-bottom: 10px;
    background: #fff;
    color: #000;
    border: 1px solid #333;
}

#kalkulator_elka .elka-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
}

#kalkulator_elka button {
    margin-top: 0;
    padding: 14px 0;
    font-size: 18px;
}

#kalkulator_elka button:hover {
    background: #333;
    color: #fff;
}