.bhv-calculator {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

    .bhv-calculator * {
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    }

    .bhv-calculator h2 {
        color: #333;
        margin-bottom: 20px;
        text-align: center;
    }

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

.bhv-calculator label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #555;
}

.bhv-calculator input,
.bhv-calculator select {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 6px;
    font-size: 16px;
    box-sizing: border-box;
    transition: border-color 0.3s ease;
}

    .bhv-calculator input:focus,
    .bhv-calculator select:focus {
        outline: none;
        border-color: #4CAF50;
        box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
    }

    .bhv-calculator input:invalid {
        border-color: #e74c3c;
    }

.button {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: 6px;
    font-size: 18px;
    font-weight: 600;
    margin-top: 10px;
}

.calculate-btn {
    background: linear-gradient(135deg, #4CAF50, #45a049);
    color: white;
    
    cursor: pointer;
    transition: all 0.3s ease;
}

    .calculate-btn:hover {
        background: linear-gradient(135deg, #45a049, #3d8b40);
        transform: translateY(-2px);
        box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
    }

    .calculate-btn.calculated {
        background: linear-gradient(135deg, #D8011E, #B80019);
    }

        .calculate-btn.calculated:hover {
            background: linear-gradient(135deg, #B80019, #9A0015);
        }

.result-container {
    margin-top: 30px;
    padding: 20px;
    background: #f8f9fa;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    display: none;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-section {
    margin-bottom: 20px;
    padding: 15px;
    background: white;
    border-radius: 6px;
    border-left: 4px solid #4CAF50;
}

    .result-section:last-child {
        margin-bottom: 0;
    }

.result-value {
    font-weight: bold;
    color: #4CAF50;
}

.warning-box {
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    border-radius: 6px;
    padding: 15px;
    margin-bottom: 20px;
    color: #856404;
}

    .warning-box strong {
        color: #d63031;
    }

.info-link {
    color: #0066cc;
    text-decoration: none;
    font-weight: 600;
}

    .info-link:hover {
        text-decoration: underline;
    }

@media (max-width: 480px) {
    .bhv-calculator {
        padding: 15px;
        margin: 10px;
    }

    .result-value {
        font-size: 20px;
    }
}