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

:root {
    --primary: #2d3748;
    --primary-dark: #1a202c;
    --secondary: #4a5568;
    --accent: #3182ce;
    --accent-hover: #2b6cb0;
    --success: #38a169;
    --danger: #e53e3e;
    --warning: #d69e2e;
    --bg: #f7fafc;
    --bg-card: #ffffff;
    --border: #e2e8f0;
    --text: #2d3748;
    --text-light: #718096;
    --radius: 6px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

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

.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.auth-box {
    background: var(--bg-card);
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 400px;
}

.auth-box h1 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--primary);
    font-size: 24px;
    font-weight: 600;
}

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

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: var(--text);
    font-size: 14px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.1);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    gap: 6px;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
}

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

.btn-success:hover {
    background: #2f855a;
}

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

.btn-danger:hover {
    background: #c53030;
}

.btn-light {
    background: rgba(255,255,255,0.9);
    color: #333;
    border: 1px solid #ddd;
}

.btn-light:hover {
    background: #fff;
}

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

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

.btn-info {
    background: #0ea5e9;
    color: white;
}

.btn-info:hover {
    background: #0284c7;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
}

.btn-outline:hover {
    background: var(--bg);
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

.auth-link {
    text-align: center;
    margin-top: 20px;
    color: var(--text-light);
    font-size: 14px;
}

.auth-link a {
    color: var(--accent);
    text-decoration: none;
}

.auth-link a:hover {
    text-decoration: underline;
}

.header {
    background: var(--primary);
    color: white;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header h1 {
    font-size: 18px;
    font-weight: 600;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

.header-user {
    font-size: 14px;
}

.header .btn {
    padding: 6px 14px;
    font-size: 13px;
}

.sidebar {
    width: 220px;
    background: var(--bg-card);
    border-right: 1px solid var(--border);
    min-height: calc(100vh - 60px);
    position: fixed;
    left: 0;
    top: 60px;
}

.sidebar-menu {
    list-style: none;
    padding: 10px 0;
}

.sidebar-menu li a {
    display: block;
    padding: 12px 20px;
    color: var(--text);
    text-decoration: none;
    font-size: 14px;
    transition: background 0.2s;
    border-left: 3px solid transparent;
}

.sidebar-menu li a:hover,
.sidebar-menu li a.active {
    background: var(--bg);
    border-left-color: var(--accent);
    color: var(--accent);
}

.main-content {
    margin-left: 220px;
    padding: 20px;
    min-height: calc(100vh - 60px);
}

.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    margin-bottom: 20px;
}

.card-header {
    padding: 15px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-header h2 {
    font-size: 16px;
    font-weight: 600;
}

.card-body {
    padding: 20px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
}

.stat-card .stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
}

.stat-card .stat-label {
    font-size: 14px;
    color: var(--text-light);
    margin-top: 5px;
}

.table-wrapper {
    overflow-x: auto;
}

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

table th,
table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 13px;
}

table th {
    background: var(--bg);
    font-weight: 600;
    color: var(--text);
    white-space: nowrap;
}

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

table tr.selected {
    background: #e0f2fe;
}

table tr {
    cursor: pointer;
}

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

.status-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.status-normal {
    background: #c6f6d5;
    color: #276749;
}

.status-disabled {
    background: #fed7d7;
    color: #c53030;
}

.status-out {
    background: #fef3c7;
    color: #92400e;
}

.toolbar {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.toolbar input[type="text"],
.toolbar select {
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 13px;
    min-width: 200px;
}

.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    margin-top: 20px;
}

.pagination button {
    padding: 8px 14px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 13px;
    transition: all 0.2s;
}

.pagination button:hover:not(:disabled) {
    background: var(--bg);
    border-color: var(--accent);
}

.pagination button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination button.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.pagination-info {
    color: var(--text-light);
    font-size: 13px;
    margin: 0 10px;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--bg-card);
    border-radius: var(--radius);
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    transform: translateY(-20px);
    transition: transform 0.2s;
    overflow: hidden;
}

.modal-overlay.active .modal {
    transform: translateY(0);
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
    background: var(--bg-card);
}

.modal-header h3 {
    font-size: 18px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-light);
    line-height: 1;
}

.modal-body {
    padding: 20px;
    overflow-y: auto;
    flex: 1;
    min-height: 0;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.modal-body::-webkit-scrollbar {
    display: none;
}

.modal-footer {
    padding: 15px 20px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    flex-shrink: 0;
    background: var(--bg-card);
}

.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 15px;
    font-size: 14px;
}

.alert-success {
    background: #c6f6d5;
    color: #276749;
    border: 1px solid #9ae6b4;
}

.alert-danger {
    background: #fed7d7;
    color: #c53030;
    border: 1px solid #feb2b2;
}

.alert-info {
    background: #bee3f8;
    color: #2b6cb0;
    border: 1px solid #90cdf4;
}

.text-ellipsis {
    max-width: 150px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.action-btns {
    display: flex;
    gap: 5px;
}

.checkbox-cell {
    width: 40px;
}

.checkbox-cell input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.tab-container {
    margin-bottom: 20px;
}

.tab-nav {
    display: flex;
    border-bottom: 1px solid var(--border);
    margin-bottom: 20px;
}

.tab-nav button {
    padding: 12px 24px;
    border: none;
    background: none;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-light);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: all 0.2s;
}

.tab-nav button:hover {
    color: var(--text);
}

.tab-nav button.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.import-textarea {
    width: 100%;
    min-height: 200px;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-family: monospace;
    font-size: 13px;
    resize: vertical;
}

.file-upload-area {
    border: 2px dashed var(--border);
    border-radius: 10px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    background: #fafafa;
}

.file-upload-area:hover,
.file-upload-area.dragover {
    border-color: var(--primary);
    background: #f0f7ff;
}

.file-upload-area.has-file {
    border-color: var(--success);
    background: #f0fdf4;
}

.file-upload-icon {
    font-size: 48px;
    margin-bottom: 12px;
}

.file-upload-text {
    color: var(--text);
    font-size: 15px;
    font-weight: 500;
    margin: 0 0 8px 0;
}

.file-upload-hint {
    color: var(--text-light);
    font-size: 13px;
    margin: 0;
}

.import-hint {
    color: var(--text-light);
    font-size: 12px;
    margin-top: 8px;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.settings-grid .form-group {
    margin-bottom: 0;
}

.settings-grid input,
.settings-grid select {
    width: 100%;
}

.hidden {
    display: none !important;
}

.toast-container {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 2000;
}

.toast {
    padding: 12px 20px;
    border-radius: var(--radius);
    margin-bottom: 10px;
    font-size: 14px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

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

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

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
}

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

@media (max-width: 768px) {
    .sidebar {
        display: none;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .toolbar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .toolbar input[type="text"],
    .toolbar select {
        min-width: 100%;
    }
}