body {
    background:#f4f6f7;
    font-family:'Segoe UI', Tahoma, sans-serif;
}

#isg-ipc-excel-v4 {
    background:#fff;
    padding:30px;
    border-radius:20px;
    border:3px solid #1a252f;
    max-width:850px;
    margin:20px auto;
    box-shadow:0 15px 40px rgba(0,0,0,0.15);
}

.header {
    text-align:center;
    border-bottom:3px solid #c0392b;
    margin-bottom:25px;
    padding-bottom:15px;
}

.row {
    display:flex;
    gap:15px;
    margin-bottom:20px;
    flex-wrap:wrap;
}

.col {
    flex:1;
    min-width:250px;
}

label {
    font-weight:bold;
    margin-bottom:5px;
    display:block;
}

select {
    width:100%;
    padding:12px;
    border-radius:8px;
    border:1px solid #bdc3c7;
}

button {
    width:100%;
    background:#1a252f;
    color:#fff;
    padding:18px;
    border:none;
    border-radius:10px;
    font-size:20px;
    font-weight:bold;
    cursor:pointer;
}

#v4_res {
    display:none;
    margin-top:25px;
    padding:20px;
    border-radius:12px;
    background:#fff5f5;
    border:2px solid #c0392b;
    text-align:center;
}

#v4_total {
    font-size:42px;
    font-weight:900;
    color:#c0392b;
}

.note {
    font-size:11px;
    color:#95a5a6;
    text-align:left;
}