/* Professional IT Asset Management - Best of Both Worlds with Dark Mode */
:root {
    --bg-main: #f5f7fa;
    --bg-panel: #ffffff;
    --bg-header: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --text-main: #2d3748;
    --text-secondary: #718096;
    --text-light: #a0aec0;
    --border-main: #e2e8f0;
    --primary: #667eea;
    --primary-hover: #5568d3;
    --success: #48bb78;
    --success-hover: #38a169;
    --warning: #ed8936;
    --danger: #f56565;
    --danger-hover: #e53e3e;
    --info: #4299e1;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
}

/* Dark Mode Theme */
body.dark-mode {
    --bg-main: #1a202c;
    --bg-panel: #2d3748;
    --bg-header: linear-gradient(135deg, #4c51bf 0%, #6b46c1 100%);
    --text-main: #f7fafc;
    --text-secondary: #cbd5e0;
    --text-light: #a0aec0;
    --border-main: #4a5568;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.3);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.3);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Theme Toggle Button */
.theme-toggle {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--primary);
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 999;
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.theme-toggle svg {
    width: 24px;
    height: 24px;
    stroke: white;
    fill: none;
}

.theme-toggle .sun-icon {
    display: none;
}

body.dark-mode .theme-toggle .moon-icon {
    display: none;
}

body.dark-mode .theme-toggle .sun-icon {
    display: block;
}

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

/* Header - Keep the gradient but more professional */
header {
    background: var(--bg-header);
    color: white;
    padding: 32px;
    border-radius: 12px;
    margin-bottom: 30px;
    box-shadow: var(--shadow-md);
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 8px;
}

header p {
    font-size: 1rem;
    opacity: 0.95;
    font-weight: 400;
}

/* Statistics Dashboard - More visual interest */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--bg-panel);
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--primary);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: var(--primary);
    opacity: 0.05;
    border-radius: 50%;
    transform: translate(30%, -30%);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-left-width: 6px;
}

.stat-card h3 {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.stat-card .value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    position: relative;
    z-index: 1;
}

/* Controls - Clean but distinctive */
.controls {
    background: var(--bg-panel);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-sm);
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
    border: 1px solid var(--border-main);
}

/* Inputs - More refined */
input, select {
    padding: 11px 14px;
    border: 2px solid var(--border-main);
    border-radius: 8px;
    font-size: 0.9rem;
    background: var(--bg-panel);
    color: var(--text-main);
    transition: all 0.2s ease;
    font-family: inherit;
}

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

input::placeholder {
    color: var(--text-light);
}

.search-box {
    flex: 1;
    min-width: 250px;
}

/* Buttons - Keep gradient feel but professional */
button {
    background: var(--primary);
    color: white;
    border: none;
    padding: 11px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.875rem;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

button:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

button:active {
    transform: translateY(0);
}

button.secondary {
    background: var(--success);
}

button.secondary:hover {
    background: var(--success-hover);
}

button.danger {
    background: var(--danger);
}

button.danger:hover {
    background: var(--danger-hover);
}

/* Table Container - More polished */
.table-container {
    background: var(--bg-panel);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    overflow: hidden;
    border: 1px solid var(--border-main);
}

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

th, td {
    padding: 16px;
    text-align: left;
}

th {
    background: var(--bg-main);
    font-weight: 600;
    color: var(--text-main);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--border-main);
}

tbody tr {
    border-bottom: 1px solid var(--border-main);
    transition: background-color 0.15s ease;
}

tbody tr:last-child {
    border-bottom: none;
}

tbody tr:hover {
    background: var(--bg-main);
}

td {
    color: var(--text-main);
}

td strong {
    color: var(--primary);
    font-weight: 600;
}

/* Status Badges - More colorful but professional */
.status-badge {
    display: inline-block;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-available {
    background: linear-gradient(135deg, #c6f6d5 0%, #9ae6b4 100%);
    color: #22543d;
}

.status-in_use {
    background: linear-gradient(135deg, #bee3f8 0%, #90cdf4 100%);
    color: #2c5282;
}

.status-maintenance {
    background: linear-gradient(135deg, #feebc8 0%, #fbd38d 100%);
    color: #7c2d12;
}

.status-retired {
    background: linear-gradient(135deg, #e2e8f0 0%, #cbd5e0 100%);
    color: #2d3748;
}

.status-lost {
    background: linear-gradient(135deg, #fed7d7 0%, #fc8181 100%);
    color: #742a2a;
}

/* Modal - Elegant overlay */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
}

.modal.active {
    display: flex;
}

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

.modal-content {
    background: var(--bg-panel);
    border-radius: 16px;
    padding: 32px;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--border-main);
}

.modal-header h2 {
    color: var(--text-main);
    font-size: 1.5rem;
    font-weight: 700;
}

.close-btn {
    background: var(--border-main);
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0;
    width: 36px;
    height: 36px;
    line-height: 1;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.close-btn:hover {
    background: var(--primary);
    color: white;
    transform: rotate(90deg);
}

/* Form - Clean and accessible */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    color: var(--text-main);
    font-size: 0.875rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
}

textarea {
    resize: vertical;
    min-height: 80px;
    font-family: inherit;
    padding: 11px 14px;
    border: 2px solid var(--border-main);
    border-radius: 8px;
    font-size: 0.9rem;
    background: var(--bg-panel);
    color: var(--text-main);
    transition: all 0.2s ease;
}

textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 28px;
    padding-top: 20px;
    border-top: 2px solid var(--border-main);
}

/* Loading & Empty States */
.loading, .empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state svg {
    width: 80px;
    height: 80px;
    margin-bottom: 20px;
    opacity: 0.4;
    stroke: var(--text-secondary);
}

.empty-state h3 {
    color: var(--text-main);
    margin-bottom: 8px;
    font-weight: 600;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 8px;
}

.action-buttons button {
    padding: 7px 14px;
    font-size: 0.8rem;
}

/* Import Zone - Visual and inviting */
.import-zone {
    border: 3px dashed var(--border-main);
    border-radius: 12px;
    padding: 48px;
    text-align: center;
    margin: 20px 0;
    transition: all 0.3s ease;
    cursor: pointer;
    background: var(--bg-main);
}

.import-zone:hover, .import-zone.drag-over {
    border-color: var(--primary);
    background: var(--bg-panel);
    transform: scale(1.02);
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.2);
}

.import-zone.processing {
    border-color: var(--success);
    background: linear-gradient(135deg, #c6f6d5 0%, #9ae6b4 100%);
}

.import-zone svg {
    width: 64px;
    height: 64px;
    margin-bottom: 16px;
    stroke: var(--primary);
}

.import-zone h3 {
    color: var(--text-main);
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 1.125rem;
}

.import-zone p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.file-input {
    display: none;
}

/* Import Results */
.import-results {
    margin-top: 20px;
    padding: 16px;
    border-radius: 8px;
    border-left: 4px solid;
    box-shadow: var(--shadow-sm);
}

.import-results.success {
    background: #c6f6d5;
    border-color: var(--success);
    color: #22543d;
}

.import-results.error {
    background: #fed7d7;
    border-color: var(--danger);
    color: #742a2a;
}

/* Progress Bar - More visual */
.progress-bar {
    width: 100%;
    height: 10px;
    background: var(--border-main);
    border-radius: 8px;
    overflow: hidden;
    margin: 12px 0;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary) 0%, var(--info) 100%);
    transition: width 0.3s ease;
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.5);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .container {
        padding: 12px;
    }
    
    header {
        padding: 24px 20px;
    }
    
    header h1 {
        font-size: 1.5rem;
    }
    
    .stats {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .controls {
        flex-direction: column;
        padding: 16px;
    }
    
    .search-box {
        width: 100%;
    }
    
    button {
        width: 100%;
    }
    
    .theme-toggle {
        bottom: 20px;
        right: 20px;
        width: 48px;
        height: 48px;
    }
    
    table {
        font-size: 0.85rem;
    }
    
    th, td {
        padding: 12px 8px;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .action-buttons button {
        width: 100%;
    }
    
    .modal-content {
        padding: 24px 20px;
    }
}

/* NEW STYLES FOR ENHANCED UI */

.error-card {
    background-color: var(--danger);
    color: white;
    border-left-color: var(--danger-hover);
}

.error-card h3 {
    color: white;
}

.loading-card {
    text-align: center;
}

.spinner {
    border: 4px solid rgba(0, 0, 0, 0.1);
    border-left-color: var(--primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.stat-card details {
    margin-top: 16px;
}

.stat-card summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 8px;
}

.stat-card summary:hover {
    color: var(--primary);
}

.flags-list {
    list-style-type: none;
    padding-left: 8px;
    font-size: 0.9rem;
}

.flags-list li {
    margin-bottom: 6px;
    padding-left: 16px;
    position: relative;
}

.flags-list li::before {
    content: '›';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: bold;
}

.value.level-high {
    color: var(--danger);
}

.value.level-medium {
    color: var(--warning);
}

.value.level-low {
    color: var(--success);
}