* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    padding: 20px;
}

.calc {
    max-width: 900px;
    margin: 0 auto;
}

.calc-inner {
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

th, td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

th {
    background-color: #f5f5f5;
}

input[type="text"] {
    width: 120px;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.btn-orange {
    background-color: #ff6b00;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.btn-orange:hover {
    background-color: #e65c00;
}

.errTxt {
    color: red;
    font-size: 14px;
}

.fldTotal {
    font-weight: bold;
    color: #28a745;
}