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

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-primary);
    line-height: 1.6;
}

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

header {
    text-align: center;
    color: white;
    margin-bottom: 30px;
    padding: 30px 20px;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

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

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

@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

.form-section,
.preview-section {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 30px;
    box-shadow: var(--shadow-xl);
}

.form-section h2,
.preview-section h2 {
    color: var(--primary-color);
    margin-bottom: 25px;
    font-size: 1.75rem;
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 10px;
}

.section-divider {
    margin: 30px 0 20px 0;
    padding-top: 20px;
    border-top: 2px solid var(--border-color);
}

.section-divider h3 {
    color: var(--secondary-color);
    font-size: 1.2rem;
    margin-bottom: 15px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group input[readonly] {
    background-color: var(--bg-color);
    cursor: not-allowed;
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

.service-item {
    background: var(--bg-color);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 15px;
    border: 2px solid var(--border-color);
}

.service-item .form-row {
    grid-template-columns: 2fr 1fr 1fr 1fr;
}

@media (max-width: 1024px) {
    .service-item .form-row {
        grid-template-columns: 1fr 1fr;
    }
}

.service-total {
    font-weight: 600;
    color: var(--primary-color);
}

.total-highlight {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-color);
    border-color: var(--primary-color) !important;
}

.upload-area {
    border: 3px dashed var(--border-color);
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--bg-color);
    position: relative;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.05);
}

.upload-content {
    width: 100%;
}

.upload-area svg {
    color: var(--primary-color);
    margin: 0 auto 15px;
    display: block;
}

.upload-content p {
    margin: 8px 0;
    color: var(--text-secondary);
}

.upload-hint {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

#logoPreview {
    max-width: 100%;
    max-height: 200px;
    border-radius: 8px;
    margin: 0 auto;
    display: block;
}

.btn-primary,
.btn-secondary {
    padding: 14px 28px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--bg-color);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--border-color);
    border-color: var(--secondary-color);
}

#addService {
    width: 100%;
    margin-bottom: 20px;
}

.action-buttons {
    display: flex;
    gap: 15px;
    margin-top: 30px;
    flex-wrap: wrap;
}

.action-buttons button {
    flex: 1;
    min-width: 150px;
}

/* Preset Controls */
.preset-controls {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05), rgba(118, 75, 162, 0.05));
    padding: 20px;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    margin-bottom: 20px;
}

.preset-buttons .button-group {
    display: flex;
    gap: 10px;
}

.preset-buttons .button-group button {
    flex: 1;
    padding: 10px 15px;
    font-size: 0.9rem;
}

.preset-select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: white;
    cursor: pointer;
}

.preset-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Invoice Preview Styles */
.invoice-preview {
    background: white;
    padding: 20px;
    border-radius: 8px;
    max-height: 80vh;
    overflow-y: auto;
}

.invoice-template {
    background: white;
    padding: 40px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
}

.invoice-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 3px solid var(--primary-color);
}

.logo-container {
    width: 150px;
 /*    height: 150px; */
    display: flex;
    align-items: center;
    justify-content: center;
}

#previewLogo {
    max-width: 150px;
    max-height: 150px;
    object-fit: contain;
}

.hotel-info {
    flex: 1;
    text-align: right;
}

.hotel-info h2 {
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 10px;
}

.hotel-info p {
    color: var(--text-secondary);
    margin: 5px 0;
}

.invoice-body {
    margin: 30px 0;
}

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

.invoice-col h3 {
    color: var(--text-primary);
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.invoice-col p {
    margin: 5px 0;
    color: var(--text-secondary);
}

.invoice-details p {
    text-align: right;
}

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

.invoice-table thead {
    background: var(--primary-color);
    color: white;
}

.invoice-table th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
}

.invoice-table th:last-child,
.invoice-table td:last-child {
    text-align: right;
}

.invoice-table tbody tr {
    border-bottom: 1px solid var(--border-color);
}

.invoice-table tbody tr:hover {
    background: var(--bg-color);
}

.invoice-table td {
    padding: 15px;
    color: var(--text-primary);
}

.text-center {
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
}

.invoice-summary {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 2px solid var(--border-color);
}

.summary-row {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    font-size: 1rem;
}

.summary-row span:first-child {
    font-weight: 600;
    color: var(--text-primary);
}

.summary-row span:last-child {
    color: var(--text-secondary);
}

.total-row {
    border-top: 2px solid var(--primary-color);
    margin-top: 10px;
    padding-top: 15px;
    font-size: 1.3rem;
    font-weight: 700;
}

.total-row span {
    color: var(--primary-color) !important;
}

.invoice-notes {
    margin-top: 30px;
    padding: 20px;
    background: var(--bg-color);
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.invoice-notes h4 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.invoice-notes p {
    color: var(--text-secondary);
    line-height: 1.8;
}

.invoice-footer {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 2px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
}

/* Scrollbar Styling */
.invoice-preview::-webkit-scrollbar {
    width: 8px;
}

.invoice-preview::-webkit-scrollbar-track {
    background: var(--bg-color);
    border-radius: 4px;
}

.invoice-preview::-webkit-scrollbar-thumb {
    background: var(--secondary-color);
    border-radius: 4px;
}

.invoice-preview::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .form-section,
    .preview-section {
        padding: 20px;
    }

    .invoice-template {
        padding: 20px;
    }

    .invoice-header {
        flex-direction: column;
        text-align: center;
    }

    .hotel-info {
        text-align: center;
        margin-top: 20px;
    }

    .invoice-row {
        grid-template-columns: 1fr;
    }

    .invoice-details p {
        text-align: left;
    }

    .action-buttons {
        flex-direction: column;
    }

    .action-buttons button {
        width: 100%;
    }
}