/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 30px;
    color: white;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Layout */
.app-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: start;
}

/* Form Section */
.form-section {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    max-height: 90vh;
    overflow-y: auto;
}

.form-group {
    margin-bottom: 25px;
}

.form-group h2 {
    color: #4a5568;
    margin-bottom: 15px;
    font-size: 1.2rem;
    border-bottom: 2px solid #e2e8f0;
    padding-bottom: 5px;
}

/* Input Styles */
input, textarea, select {
    width: 100%;
    padding: 12px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s ease;
    margin-bottom: 10px;
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

textarea {
    resize: vertical;
    min-height: 80px;
}

.input-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

/* Items Section */
.items-header {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr 0.5fr;
    gap: 10px;
    padding: 10px;
    background: #f7fafc;
    border-radius: 8px;
    font-weight: bold;
    margin-bottom: 10px;
    font-size: 14px;
}

.item-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr 0.5fr;
    gap: 10px;
    align-items: center;
    margin-bottom: 10px;
    padding: 10px;
    background: #f9f9f9;
    border-radius: 8px;
    border: 1px solid #e2e8f0;
}

.item-row input {
    margin-bottom: 0;
    padding: 8px;
    font-size: 13px;
}

.item-row .subtotal {
    font-weight: bold;
    color: #2d3748;
    text-align: center;
    padding: 8px;
    background: white;
    border-radius: 4px;
}

.remove-item {
    background: #e53e3e;
    color: white;
    border: none;
    border-radius: 4px;
    padding: 8px;
    cursor: pointer;
    font-size: 12px;
    transition: background 0.3s ease;
}

.remove-item:hover {
    background: #c53030;
}

.add-item-btn {
    background: #48bb78;
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: bold;
    transition: background 0.3s ease;
    width: 100%;
    margin-top: 10px;
}

.add-item-btn:hover {
    background: #38a169;
}

/* Action Buttons */
.action-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-top: 30px;
}

.btn {
    padding: 15px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    text-align: center;
    display: inline-block;
}

.btn-pdf {
    background: #e53e3e;
    color: white;
}

.btn-pdf:hover {
    background: #c53030;
    transform: translateY(-2px);
}

.btn-word {
    background: #2b6cb0;
    color: white;
}

.btn-word:hover {
    background: #2c5282;
    transform: translateY(-2px);
}

.btn-excel {
    background: #38a169;
    color: white;
}

.btn-excel:hover {
    background: #2f855a;
    transform: translateY(-2px);
}

.btn-email {
    background: #805ad5;
    color: white;
}

.btn-email:hover {
    background: #6b46c1;
    transform: translateY(-2px);
}

.btn-print {
    background: #4a5568;
    color: white;
}

.btn-print:hover {
    background: #2d3748;
    transform: translateY(-2px);
}

/* Preview Section */
.preview-section {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    max-height: 90vh;
    overflow-y: auto;
}

.preview-section h2 {
    color: #4a5568;
    margin-bottom: 20px;
    font-size: 1.2rem;
    border-bottom: 2px solid #e2e8f0;
    padding-bottom: 5px;
}

/* Document Preview */
.document-preview {
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    padding: 30px;
    background: white;
    min-height: 400px;
    font-family: 'Times New Roman', serif;
    line-height: 1.6;
    position: relative;
}

.document-header {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: start;
    gap: 16px;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid #e2e8f0;
}

.company-info {
    flex: 1;
}

.company-logo {
    max-width: 150px;
    max-height: 100px;
    object-fit: contain;
    justify-self: end;
}

.document-title {
    font-size: 2rem;
    font-weight: bold;
    color: #2d3748;
    margin: 20px 0;
    text-transform: uppercase;
    text-align: center;
}

/* Watermark */
.doc-content { position: relative; z-index: 1; }
.content-area { position: relative; }

.document-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

.client-info, .invoice-info {
    padding: 15px;
    background: #f7fafc;
    border-radius: 8px;
}

.info-title {
    font-weight: bold;
    color: #4a5568;
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.items-table {
    width: 100%;
    border-collapse: collapse;
    margin: 30px 0;
}

.items-table th,
.items-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #e2e8f0;
}

.items-table th {
    background: #f7fafc;
    font-weight: bold;
    color: #4a5568;
}

.items-table .number-cell {
    text-align: right;
}

.total-section {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 2px solid #e2e8f0;
}

.total-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.total-row.final {
    font-weight: bold;
    font-size: 1.3rem;
    color: #2d3748;
    border-top: 1px solid #e2e8f0;
    padding-top: 10px;
}

.document-footer {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #e2e8f0;
    color: #718096;
    font-size: 0.9rem;
}

.timestamp {
    text-align: center;
    color: #a0aec0;
    font-size: 0.8rem;
    margin-top: 20px;
    font-style: italic;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .app-layout {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .items-header,
    .item-row {
        grid-template-columns: 1fr;
        gap: 5px;
    }
    
    .items-header span {
        display: none;
    }
    
    .item-row input,
    .item-row .subtotal {
        margin-bottom: 5px;
    }
    
    .action-buttons {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .form-section,
    .preview-section {
        padding: 20px;
    }
    
    .document-details {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .document-header {
        flex-direction: column;
        gap: 20px;
    }
    
    .action-buttons {
        grid-template-columns: 1fr;
    }
}

/* Print Styles */
@media print {
    /* Hide everything except the document preview card */
    body * {
        visibility: hidden;
    }
    
    /* Show only the document preview and its contents */
    .document-preview,
    .document-preview * {
        visibility: visible;
    }
    
    /* Position the document at the top */
    .document-preview {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        border: none;
        padding: 20px;
        box-shadow: none;
        background: white;
    }
    
    /* Ensure text colors are readable */
    * {
        color: black !important;
        background: white !important;
    }
    /* Hide the "Live Preview" heading in print */
    .preview-section h2 { display: none !important; }
    
    @page { margin: 12mm; }
}