.bitumen-calculator-container {
    max-width: 600px;
    margin: 20px auto;
    padding: 30px;
    background: #f9f9f9;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.calculator-form .form-group {
    margin-bottom: 20px;
}

.calculator-form label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: #333;
}

.calculator-form input,
.calculator-form select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

.calculate-btn,
.email-btn {
    background: #007cba;
    color: white;
    padding: 12px 24px;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s;
}

.calculate-btn:hover,
.email-btn:hover {
    background: #005a87;
}

.resultaat {
    margin-top: 30px;
    padding: 20px;
    background: white;
    border-radius: 4px;
    border-left: 4px solid #007cba;
}

.resultaat h3 {
    margin-top: 0;
    color: #333;
}

.totaal-prijs {
    font-size: 18px;
    font-weight: bold;
    color: #007cba;
}

.totaal-incl-btw {
    font-size: 20px;
    font-weight: bold;
    color: #333;
    border-top: 1px solid #ddd;
    padding-top: 10px;
    margin-top: 10px;
}

.email-section {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #ddd;
}

.email-section input {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.email-status {
    margin-top: 10px;
    padding: 10px;
    border-radius: 4px;
}

.email-status .success {
    color: #155724;
    background: #d4edda;
    border: 1px solid #c3e6cb;
    padding: 10px;
    display: block;
}

.email-status .error {
    color: #721c24;
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    padding: 10px;
    display: block;
}

.btw {
    color: #666;
    font-style: italic;
}