.invoice-generator-tool-container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 15px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    overflow: hidden;
}

.invoice-tool-header {
    background: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

.invoice-tool-header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

.invoice-tool-header p {
    font-size: 1.2em;
    opacity: 0.9;
}

.invoice-tool-main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    padding: 30px;
}

@media (max-width: 768px) {
    .invoice-tool-main-content {
        grid-template-columns: 1fr;
    }
}

.invoice-tool-form-section, .invoice-tool-preview-section {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 10px;
    border: 1px solid #e9ecef;
}

.invoice-tool-form-section h2 {
    color: #2c3e50;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 3px solid #3498db;
}

.invoice-tool-form-section h3 {
    color: #34495e;
    margin: 20px 0 15px 0;
}

.invoice-tool-form-group {
    margin-bottom: 15px;
}

.invoice-tool-form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: #2c3e50;
}

.invoice-tool-form-group input, 
.invoice-tool-form-group select, 
.invoice-tool-form-group textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.invoice-tool-form-group input:focus, 
.invoice-tool-form-group select:focus, 
.invoice-tool-form-group textarea:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.invoice-tool-form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

@media (max-width: 480px) {
    .invoice-tool-form-row {
        grid-template-columns: 1fr;
    }
}

.invoice-tool-items-container {
    margin: 20px 0;
}

.invoice-tool-item-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr auto;
    gap: 10px;
    align-items: end;
    padding: 15px;
    background: white;
    border-radius: 8px;
    margin-bottom: 10px;
    border: 1px solid #e9ecef;
}

@media (max-width: 768px) {
    .invoice-tool-item-row {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

.invoice-tool-btn {
    padding: 12px 25px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.invoice-tool-btn-primary {
    background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
    color: white;
}

.invoice-tool-btn-primary:hover {
    background: linear-gradient(135deg, #2980b9 0%, #1c6ea4 100%);
    transform: translateY(-2px);
}

.invoice-tool-btn-success {
    background: linear-gradient(135deg, #27ae60 0%, #229954 100%);
    color: white;
}

.invoice-tool-btn-success:hover {
    background: linear-gradient(135deg, #229954 0%, #1e7e34 100%);
    transform: translateY(-2px);
}

.invoice-tool-btn-danger {
    background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
    color: white;
}

.invoice-tool-btn-danger:hover {
    background: linear-gradient(135deg, #c0392b 0%, #a93226 100%);
    transform: translateY(-2px);
}

.invoice-tool-totals-section {
    background: white;
    padding: 20px;
    border-radius: 10px;
    margin-top: 20px;
    border: 2px solid #3498db;
}

.invoice-tool-total-row {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid #eee;
}

.invoice-tool-grand-total {
    font-size: 1.3em;
    font-weight: bold;
    color: #2c3e50;
    border-top: 2px solid #3498db;
    margin-top: 10px;
    padding-top: 10px;
}

.invoice-tool-preview {
    background: white;
    padding: 25px;
    border-radius: 10px;
    min-height: 500px;
    font-family: 'Courier New', monospace;
}

.invoice-tool-preview-header {
    text-align: center;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 2px solid #3498db;
}

.invoice-tool-footer {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 20px;
    margin-top: 30px;
}

.invoice-tool-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 20px;
    background: #27ae60;
    color: white;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 1000;
}

.invoice-tool-notification.show {
    transform: translateX(0);
}