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

:root {
    --primary-color: #0078d4;
    --header-bg: #f3f4f6;
    --border-color: #d1d5db;
    --hover-bg: #e0f2fe;
    --text-primary: #111827;
    --text-secondary: #6b7280;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f9fafb;
    min-height: 100vh;
}

.container {
    max-width: 100%;
    margin: 0;
    background: white;
}

.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.header h1 {
    font-size: 26px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.header-actions {
    display: flex;
    gap: 10px;
}

.column-selector {
    padding: 15px 30px;
    background: white;
    border-bottom: 2px solid var(--border-color);
}

.selector-wrapper {
    display: flex;
    align-items: center;
    gap: 15px;
}

.selector-label {
    font-size: 14px;
    font-weight: 600;
    color: #374151;
    white-space: nowrap;
}

.column-dropdown {
    position: relative;
    flex: 1;
}

.dropdown-button {
    width: 100%;
    padding: 10px 15px;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.2s;
}

.dropdown-button:hover {
    border-color: var(--primary-color);
    box-shadow: 0 2px 8px rgba(0, 120, 212, 0.15);
}

.dropdown-button::after {
    content: '▼';
    font-size: 10px;
    color: var(--text-secondary);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-top: 4px;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    max-height: 500px;
    overflow-y: auto;
    z-index: 1000;
    display: none;
}

.dropdown-menu.open {
    display: block;
}

.column-category {
    padding: 12px 15px;
    background: #f3f4f6;
    font-weight: 700;
    font-size: 13px;
    color: #374151;
    border-bottom: 1px solid var(--border-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.column-items {
    padding: 8px 0;
}

.column-checkbox {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    cursor: pointer;
    transition: background 0.2s;
}

.column-checkbox:hover {
    background: var(--hover-bg);
}

.column-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    margin: 0;
}

.column-checkbox input[type="checkbox"]:checked {
    accent-color: var(--primary-color);
}

.column-checkbox label {
    cursor: pointer;
    font-size: 13px;
    color: var(--text-primary);
    font-weight: 500;
    -webkit-user-select: none;
    user-select: none;
    margin: 0;
    flex: 1;
}

.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
    background: white;
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 15px;
}

.search-box {
    display: flex;
    gap: 10px;
    flex: 1;
    min-width: 400px;
}

.search-box input {
    flex: 1;
    padding: 10px 15px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    font-size: 14px;
    transition: all 0.2s;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 120, 212, 0.1);
}

.records-info {
    display: flex;
    gap: 10px;
    align-items: center;
}

.badge {
    background: var(--primary-color);
    color: white;
    padding: 6px 14px;
    border-radius: 4px;
    font-size: 13px;
    font-weight: 600;
}

.btn {
    padding: 10px 18px;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    padding: 8px 20px;
    font-size: 13px;
}

.btn-primary:hover {
    background: #005a9e;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 120, 212, 0.3);
}

.btn-secondary {
    background: #6b7280;
    color: white;
}

.btn-secondary:hover {
    background: #4b5563;
}

.btn-export {
    background: #16a34a;
    color: white;
}

.btn-export:hover {
    background: #15803d;
}

.btn-apply {
    flex-shrink: 0;
}

.table-wrapper {
    overflow-x: auto;
    min-height: 400px;
    position: relative;
    background: white;
}

.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px;
    color: var(--text-secondary);
}

.loading-state.hidden {
    display: none;
}

.spinner {
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin-bottom: 15px;
}

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

.data-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 13px;
    min-width: 100%;
}

.data-table thead {
    position: sticky;
    top: 0;
    z-index: 10;
    background: white;
}

.data-table th {
    background: #f9fafb;
    padding: 12px 15px;
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
    white-space: nowrap;
    position: relative;
    cursor: pointer;
    user-select: none;
}

.data-table th:hover {
    background: #f3f4f6;
}

.data-table th.sortable::after {
    content: '⇅';
    margin-left: 5px;
    color: var(--text-secondary);
    font-size: 11px;
}

.data-table th.sort-asc::after {
    content: '▲';
    color: var(--primary-color);
}

.data-table th.sort-desc::after {
    content: '▼';
    color: var(--primary-color);
}

.data-table td {
    padding: 12px 15px;
    border-bottom: 1px solid #e5e7eb;
    color: var(--text-primary);
}

.data-table tbody tr:hover {
    background: #f9fafb;
}

.data-table tbody tr:nth-child(even) {
    background: #fafafa;
}

.data-table tbody tr:nth-child(even):hover {
    background: #f3f4f6;
}

.filter-input {
    width: 100%;
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    border-radius: 3px;
    font-size: 12px;
    transition: all 0.2s;
}

.filter-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 120, 212, 0.1);
}

.pagination {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    background: white;
    border-top: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 15px;
}

.pagination-controls {
    display: flex;
    gap: 8px;
    align-items: center;
}

.btn-page {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    background: white;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: all 0.2s;
}

.btn-page:hover:not(:disabled) {
    background: var(--hover-bg);
    border-color: var(--primary-color);
}

.btn-page:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.page-numbers {
    display: flex;
    gap: 4px;
}

.page-number {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    background: white;
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.2s;
    min-width: 36px;
    text-align: center;
}

.page-number:hover {
    background: var(--hover-bg);
    border-color: var(--primary-color);
}

.page-number.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.per-page-selector {
    display: flex;
    gap: 8px;
    align-items: center;
}

.per-page-selector label {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 600;
}

.per-page-selector select {
    padding: 8px 12px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}

.per-page-selector select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 120, 212, 0.1);
}

.error-message {
    padding: 20px;
    background: #fee2e2;
    color: #991b1b;
    border-radius: 4px;
    margin: 20px;
    text-align: center;
    font-weight: 600;
}

.column-resizer {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 5px;
    cursor: col-resize;
    user-select: none;
    z-index: 1;
}

.column-resizer:hover {
    background: var(--primary-color);
}

.resizing {
    cursor: col-resize !important;
    user-select: none;
}

@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }

    .search-box {
        min-width: 100%;
    }

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