.invoice-main-flexbox {
    display: flex;
    gap: 20px;
    padding: 20px;
}

.invoice-type-layer {
    flex: 1;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 10px;
    background-color: #ffffff;
    min-height: 200px;
    box-shadow: 0 0 10px #ccc;
    cursor: pointer;
}

.invoice-type-layer:hover {
    background-color: #FAE39C;
}

fieldset {
    background-color: #ffffff;
    border-color: #ccc;
    border-width: 1px;
    border-radius: 10px;
    margin: 10px 20px;
    padding: 15px 50px 15px 30px;
    box-shadow: 0 0 10px #ccc;
}

fieldset legend {
    border-left-style: solid;
    border-left-width: 20px;
    border-color: #ccc;
    border-bottom-style: solid;
    border-bottom-width: 1px;
    padding: 10px 25px;
    background-color: #ffffff;
    border-radius: 10px;
}

.invoice-list-table {
    width: 90%;
    margin: 20px auto;
}

.invoice-list-table td {
    border-bottom: 1px solid #c3c4c7;
    padding: 10px;
}

.invoice-list-table tr td:first-child {
    border-left: 1px solid #c3c4c7;
}

.invoice-list-table tr td:last-child {
    border-right: 1px solid #c3c4c7;
}

.invoice-list-table tr:first-child td {
    background: linear-gradient(to bottom, #fff, #f6f7f7);
}

/* ═══════════════════════════════════════════
   RESPONSIVE – TABLET (640px – 1023px)
═══════════════════════════════════════════ */
@media (max-width: 1023px) {
    .invoice-main-flexbox {
        flex-wrap: wrap;
        gap: 15px;
        padding: 15px;
    }

    .invoice-type-layer {
        flex: 1 1 calc(50% - 15px);
        min-width: 180px;
        min-height: 150px;
    }

    fieldset {
        margin: 10px 10px;
        padding: 12px 20px;
    }

    .invoice-list-table {
        width: 100%;
        font-size: 0.9rem;
    }
}

/* ═══════════════════════════════════════════
   RESPONSIVE – SMARTPHONE (< 640px)
═══════════════════════════════════════════ */
@media (max-width: 639px) {
    .invoice-main-flexbox {
        flex-direction: column;
        padding: 10px;
        gap: 10px;
    }

    .invoice-type-layer {
        flex: 1 1 100%;
        min-height: 100px;
        font-size: 0.9rem;
        padding: 12px;
    }

    fieldset {
        margin: 8px 4px;
        padding: 10px 12px;
    }

    fieldset legend {
        padding: 6px 12px;
        font-size: 0.9rem;
    }

    .invoice-list-table {
        width: 100%;
        font-size: 0.82rem;
    }

    .invoice-list-table tr {
        display: block;
        margin-bottom: 10px;
        border: 1px solid #c3c4c7;
        border-radius: 6px;
        padding: 6px;
    }

    .invoice-list-table td {
        display: block;
        width: 100% !important;
        border: none !important;
        padding: 4px 6px;
    }

    .invoice-list-table tr:first-child td {
        background: linear-gradient(to bottom, #fff, #f6f7f7);
        border-bottom: 1px solid #ddd !important;
        font-weight: bold;
    }

    .invoice-list-table input[type="button"],
    .invoice-list-table .button {
        width: 100%;
        margin-top: 6px;
    }
}