/* CSS Variables for theming */
:root {
    --bg-color: #ffffff;
    --text-color: #333333;
    --text-secondary: #6c757d;
    --card-bg: #f8f9fa;
    --border-color: #e0e0e0;
    --primary-color: #007c89;
    --primary-hover: #006570;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --accent-color: #28a745;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --text-color: #ffffff;
    --text-secondary: #b0b0b0;
    --card-bg: #2d2d2d;
    --border-color: #404040;
    --primary-color: #00a0b0;
    --primary-hover: #008a9a;
    --secondary-color: #8a8a8a;
    --accent-color: #4caf50;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

/* App Header */
.app-header {
    background: var(--primary-color);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.back-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.back-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.theme-toggle {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    font-size: 18px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

/* Navigation Dropdown */
.app-nav-dropdown {
    position: relative;
    display: inline-block;
}

.nav-dropdown-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-dropdown-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.nav-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-hover);
    min-width: 250px;
    z-index: 1000;
    display: none;
    overflow: hidden;
}

.nav-dropdown-menu.show {
    display: block;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    text-decoration: none;
    color: var(--text-color);
    transition: background-color 0.2s ease;
    border-bottom: 1px solid var(--border-color);
}

.nav-item:last-child {
    border-bottom: none;
}

.nav-item:hover {
    background: var(--primary-color);
    color: white;
}

.nav-item.active {
    background: var(--primary-color);
    color: white;
    font-weight: 600;
}

.nav-icon {
    font-size: 1.1rem;
    width: 20px;
    text-align: center;
}

/* App Introduction */
.app-intro {
    background: var(--card-bg);
    margin: 2rem 0;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.app-intro h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.app-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.app-description h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.app-description ul {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.app-description li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.install-prompt {
    background: var(--bg-color);
    padding: 1rem;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    text-align: center;
}

.install-prompt p {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.install-prompt small {
    color: var(--text-secondary);
}

/* Login Card */
.login-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.login-card h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-color);
}

.form-group input, .form-group select {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid var(--border-color);
    border-radius: 5px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group small {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 0.5rem;
    display: block;
}

/* Dashboard */
.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.dashboard-header h2 {
    color: var(--primary-color);
    font-size: 2rem;
}

.dashboard-controls {
    display: flex;
    gap: 1rem;
}

/* Price Update Panel */
.price-update-panel {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.price-update-panel h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.update-options {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.option-group h4 {
    color: var(--text-color);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

/* Radio Groups */
.radio-group {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.radio-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-weight: 500;
}

.radio-group input[type="radio"] {
    width: auto;
    margin: 0;
}

/* Adjustment Controls */
.adjustment-controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.adjustment-controls input {
    padding: 0.8rem;
    border: 2px solid var(--border-color);
    border-radius: 5px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
}

#adjustmentLabel {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.adjustment-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
}

.btn-quick {
    background: var(--secondary-color);
    color: white;
    border: none;
    padding: 0.5rem;
    border-radius: 5px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-quick:hover {
    background: #5a6268;
    transform: translateY(-1px);
}

/* Price Filters */
.price-filters {
    border-top: 2px solid var(--border-color);
    padding-top: 2rem;
    margin-bottom: 2rem;
}

.price-filters h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.filter-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr auto;
    gap: 1rem;
    align-items: end;
}

.filter-group input, .filter-group select {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid var(--border-color);
    border-radius: 5px;
    background-color: var(--bg-color);
    color: var(--text-color);
}

/* Preview Actions */
.preview-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding-top: 2rem;
    border-top: 2px solid var(--border-color);
}

.selection-count {
    color: var(--text-secondary);
    font-weight: 500;
    margin-left: auto;
}

/* Products Table */
.products-table-container {
    background: var(--card-bg);
    border-radius: 10px;
    box-shadow: var(--shadow);
    overflow: hidden;
    margin-bottom: 2rem;
}

.products-table {
    width: 100%;
    border-collapse: collapse;
}

.products-table th {
    background: var(--primary-color);
    color: white;
    padding: 1rem;
    text-align: left;
    font-weight: 600;
}

.products-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

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

/* Product Info */
.product-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.product-image {
    width: 50px;
    height: 50px;
    border-radius: 8px;
    object-fit: cover;
    background: var(--border-color);
}

.product-details h4 {
    margin-bottom: 0.3rem;
    color: var(--text-color);
}

.product-handle {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Price Display */
.price-display {
    font-weight: bold;
    font-size: 1.1rem;
}

.price-change {
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.9rem;
    font-weight: 600;
}

.price-change.increase {
    background: #ffeaa7;
    color: #d63031;
}

.price-change.decrease {
    background: #d1f2eb;
    color: #00a085;
}

.price-change.no-change {
    background: var(--border-color);
    color: var(--text-secondary);
}

/* Status Indicators */
.status-indicator {
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.9rem;
    font-weight: 600;
    text-align: center;
}

.status-indicator.pending {
    background: var(--warning-color);
    color: #333;
}

.status-indicator.updated {
    background: var(--success-color);
    color: white;
}

.status-indicator.error {
    background: var(--danger-color);
    color: white;
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-preview, .btn-apply, .btn-pagination {
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
    font-size: 0.9rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
}

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

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

.btn-preview {
    background-color: var(--info-color);
    color: white;
}

.btn-preview:hover {
    background-color: #138496;
}

.btn-apply {
    background-color: var(--success-color);
    color: white;
}

.btn-apply:hover:not(:disabled) {
    background-color: #218838;
}

.btn-apply:disabled, .btn-primary:disabled {
    background-color: var(--border-color);
    color: var(--text-secondary);
    cursor: not-allowed;
    transform: none;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    padding: 2rem 0;
}

#pageInfo {
    color: var(--text-secondary);
    font-weight: 500;
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background-color: var(--card-bg);
    margin: 5% auto;
    padding: 2rem;
    border-radius: 15px;
    width: 90%;
    max-width: 600px;
    position: relative;
    animation: slideIn 0.3s ease;
}

.modal-large {
    max-width: 900px;
}

.modal-close {
    color: var(--text-secondary);
    float: right;
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-color);
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
}

/* Preview Summary */
.preview-summary {
    background: var(--bg-color);
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    border: 2px solid var(--border-color);
}

.preview-summary h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.summary-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Import Instructions */
.import-instructions {
    background: var(--bg-color);
    padding: 1rem;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    margin-bottom: 1.5rem;
}

.import-instructions ul {
    margin-left: 1.5rem;
    margin-top: 0.5rem;
}

.import-preview {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    margin: 1rem 0;
}

.import-preview table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.import-preview th,
.import-preview td {
    padding: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    text-align: left;
}

.import-preview th {
    background: var(--card-bg);
    font-weight: 600;
}

/* Loading Spinner */
.loading {
    text-align: center;
    padding: 3rem;
}

.spinner {
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Notifications */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    color: white;
    font-weight: 600;
    z-index: 1001;
    animation: slideIn 0.3s ease;
    max-width: 400px;
}

.notification.success {
    background-color: var(--success-color);
}

.notification.error {
    background-color: var(--danger-color);
}

.notification.warning {
    background-color: var(--warning-color);
    color: #333;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Footer */
footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

.footer-copyright {
    margin-bottom: 1rem;
}

.footer-copyright a {
    color: var(--accent-color);
    text-decoration: none;
}

.footer-copyright a:hover {
    text-decoration: underline;
}

.footer-links {
    font-size: 0.9rem;
}

.footer-links a {
    color: #ccc;
    text-decoration: none;
    margin: 0 0.5rem;
}

.footer-links a:hover {
    color: white;
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .update-options {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .filter-grid {
        grid-template-columns: 1fr 1fr;
        gap: 1rem;
    }

    .summary-stats {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }

    .app-intro {
        margin: 1rem 0;
        padding: 1.5rem;
    }

    .app-intro h1 {
        font-size: 2rem;
    }

    .dashboard-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .dashboard-controls {
        width: 100%;
        justify-content: center;
    }

    .filter-grid {
        grid-template-columns: 1fr;
    }

    .adjustment-buttons {
        grid-template-columns: repeat(2, 1fr);
    }

    .preview-actions {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }

    .selection-count {
        text-align: center;
        margin-left: 0;
    }

    .products-table-container {
        overflow-x: auto;
    }

    .products-table {
        min-width: 800px;
    }

    .header-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .modal-content {
        margin: 10% auto;
        padding: 1.5rem;
    }

    .modal-actions {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .price-update-panel {
        padding: 1rem;
    }

    .product-info {
        flex-direction: column;
        align-items: flex-start;
        text-align: left;
    }

    .adjustment-buttons {
        grid-template-columns: 1fr;
    }
}