/* 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;
    --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;
}

/* Inventory Stats */
.inventory-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-3px);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-secondary);
    font-weight: 500;
}

/* Inventory Filters */
.inventory-filters {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
    display: grid;
    grid-template-columns: 2fr 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);
}

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

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

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

.inventory-table th.sortable {
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.inventory-table th.sortable:hover {
    background: var(--primary-hover);
}

.inventory-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

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

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

.stock-status.in-stock {
    background: var(--success-color);
    color: white;
}

.stock-status.low-stock {
    background: var(--warning-color);
    color: #333;
}

.stock-status.out-of-stock {
    background: var(--danger-color);
    color: white;
}

/* 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-variant {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Location Tags */
.location-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
}

.location-tag {
    background: var(--primary-color);
    color: white;
    padding: 0.2rem 0.6rem;
    border-radius: 10px;
    font-size: 0.8rem;
    white-space: nowrap;
}

.location-stock {
    display: block;
    font-size: 0.7rem;
    opacity: 0.9;
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-clear, .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 {
    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-clear {
    background-color: var(--secondary-color);
    color: white;
}

.btn-clear:hover {
    background-color: #5a6268;
}

.btn-action {
    background-color: var(--accent-color);
    color: white;
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
}

.btn-action:hover {
    background-color: #218838;
}

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

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

/* Modal */
.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: 500px;
    position: relative;
    animation: slideIn 0.3s ease;
}

.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;
}

/* 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: 1024px) {
    .inventory-filters {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

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

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

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

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

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

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

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

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

    .location-tags {
        flex-direction: column;
    }

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