/* ===================================
   CSS Variables
   =================================== */
:root {
    /* Colors */
    --primary-color: #0066cc;
    --primary-hover: #0052a3;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    
    /* Gray Scale */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Font Sizes */
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 30px;
    
    /* Border Radius */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    --border-radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

/* ===================================
   Reset & Base Styles
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--dark-color);
    background: var(--gray-50);
    min-height: 100vh;
}

/* ===================================
   Header & Navigation
   =================================== */
.main-header {
    background: white;
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.navbar {
    padding: 0;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 64px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-weight: 700;
    font-size: var(--font-size-lg);
    color: var(--dark-color);
}

.logo {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), #004080);
    color: white;
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 18px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
    justify-content: flex-end;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--gray-700);
    text-decoration: none;
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast);
    font-size: var(--font-size-sm);
    font-weight: 500;
    white-space: nowrap;
}

.nav-link:hover {
    background: var(--gray-100);
    color: var(--primary-color);
}

.nav-link.active {
    background: var(--primary-color);
    color: white;
}

.nav-icon {
    font-size: 18px;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    padding: var(--spacing-sm);
    cursor: pointer;
}

.mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--dark-color);
    transition: var(--transition-fast);
}

/* ===================================
   Page Container & Layout
   =================================== */
.page-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-lg);
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-2xl);
    gap: var(--spacing-lg);
}

.page-header h1 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: var(--spacing-xs);
}

.page-subtitle {
    font-size: var(--font-size-base);
    color: var(--gray-600);
    margin: 0;
}

.header-actions {
    display: flex;
    gap: var(--spacing-md);
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 10px 20px;
    border: none;
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

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

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

.btn-secondary {
    background: var(--gray-200);
    color: var(--gray-700);
}

.btn-secondary:hover {
    background: var(--gray-300);
}

/* ===================================
   Statistics Cards
   =================================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.stat-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    transition: var(--transition-base);
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.stat-icon {
    font-size: 48px;
    opacity: 0.9;
}

.stat-content h3 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: var(--spacing-xs);
}

.stat-content p {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    margin: 0 0 var(--spacing-xs) 0;
}

.stat-change {
    font-size: var(--font-size-xs);
    font-weight: 600;
    padding: 2px 8px;
    border-radius: var(--border-radius-sm);
}

.stat-change.positive {
    background: #d4edda;
    color: #155724;
}

.stat-change.negative {
    background: #f8d7da;
    color: #721c24;
}

.stat-change.neutral {
    background: var(--gray-100);
    color: var(--gray-600);
}

/* ===================================
   User Stats (Alternative Layout)
   =================================== */
.user-stats {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-2xl);
}

.stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-xl);
}

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

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
}

/* ===================================
   Table Controls (Search & Filters)
   =================================== */
.table-controls {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

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

.search-input {
    width: 100%;
    padding: 10px 16px;
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-sm);
    transition: var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.filter-container {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.filter-select {
    padding: 10px 16px;
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-sm);
    background: white;
    cursor: pointer;
    transition: var(--transition-fast);
}

.filter-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

/* ===================================
   Tables - FIXED LAYOUT
   =================================== */
.table-container {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    overflow-x: auto;
    overflow-y: visible;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
    table-layout: fixed;
    min-width: 100%;
}

.data-table thead {
    background: var(--gray-50);
    border-bottom: 2px solid var(--gray-200);
}

.data-table th {
    padding: 16px 12px;
    text-align: left;
    font-weight: 600;
    color: var(--gray-700);
    text-transform: uppercase;
    font-size: var(--font-size-xs);
    letter-spacing: 0.5px;
    white-space: nowrap;
    position: sticky;
    top: 0;
    background: var(--gray-50);
    z-index: 10;
}

.data-table td {
    padding: 16px 12px;
    border-bottom: 1px solid var(--gray-100);
    vertical-align: middle;
    overflow: hidden;
    text-overflow: ellipsis;
}

.data-table tbody tr {
    transition: var(--transition-fast);
}

.data-table tbody tr:hover {
    background: var(--gray-50);
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

/* ===================================
   Badges
   =================================== */
.role-badge,
.status-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: var(--border-radius-full);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    white-space: nowrap;
}

/* Role Badges */
.role-badge.role-admin {
    background: #e3f2fd;
    color: #1976d2;
}

.role-badge.role-manager {
    background: #f3e5f5;
    color: #7b1fa2;
}

/* Status Badges */
.status-badge.status-active {
    background: #d4edda;
    color: #155724;
}

.status-badge.status-inactive {
    background: #f8d7da;
    color: #721c24;
}

.status-badge.status-suspended {
    background: #fff3cd;
    color: #856404;
}

.status-badge.status-open {
    background: #d1ecf1;
    color: #0c5460;
}

.status-badge.status-pending {
    background: #fff3cd;
    color: #856404;
}

.status-badge.status-resolved,
.status-badge.status-completed {
    background: #d4edda;
    color: #155724;
}

.status-badge.status-closed {
    background: var(--gray-200);
    color: var(--gray-700);
}

/* ===================================
   Messages
   =================================== */
.success-message,
.error-message {
    padding: 16px 20px;
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-sm);
}

.success-message {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.error-message {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.message-icon {
    font-size: 20px;
}

/* ===================================
   Forms
   =================================== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    color: var(--gray-700);
    font-weight: 600;
    font-size: var(--font-size-sm);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 16px;
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-sm);
    transition: var(--transition-fast);
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form-group input:disabled,
.form-group select:disabled {
    background: var(--gray-100);
    cursor: not-allowed;
}

.form-help {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-xs);
    color: var(--gray-600);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.form-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
    justify-content: flex-end;
}

/* ===================================
   Modal
   =================================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.modal-content {
    background: white;
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-2xl);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.modal-header h2 {
    font-size: var(--font-size-2xl);
    color: var(--dark-color);
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: 28px;
    color: var(--gray-500);
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-md);
    transition: var(--transition-fast);
}

.modal-close:hover {
    background: var(--gray-100);
    color: var(--gray-700);
}

/* ===================================
   Dashboard Specific
   =================================== */
.dashboard-container {
    /* Dashboard specific styles */
}

.quick-actions-section h2 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: var(--spacing-lg);
}

.quick-actions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.quick-action-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
    text-align: center;
}

.quick-action-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.action-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
}

.quick-action-card h3 {
    font-size: var(--font-size-lg);
    color: var(--dark-color);
    margin-bottom: var(--spacing-sm);
}

.quick-action-card p {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    margin: 0;
}

/* ===================================
   Settings & Tabs
   =================================== */
.settings-container {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: var(--spacing-2xl);
}

.settings-nav {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    height: fit-content;
    position: sticky;
    top: 80px;
}

.settings-tabs {
    list-style: none;
}

.settings-tabs li {
    margin-bottom: var(--spacing-xs);
}

.tab-link {
    display: block;
    padding: var(--spacing-md);
    color: var(--gray-700);
    text-decoration: none;
    border-radius: var(--border-radius-md);
    transition: var(--transition-fast);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.tab-link:hover {
    background: var(--gray-100);
    color: var(--primary-color);
}

.tab-link.active {
    background: var(--primary-color);
    color: white;
}

.settings-content {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
}

.settings-section {
    margin-bottom: var(--spacing-2xl);
}

.settings-section:last-child {
    margin-bottom: 0;
}

.settings-section h2 {
    font-size: var(--font-size-2xl);
    color: var(--dark-color);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--gray-200);
}

.tab-content {
    display: none;
}

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

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
    .settings-container {
        grid-template-columns: 1fr;
    }
    
    .settings-nav {
        position: static;
    }
}

@media (max-width: 768px) {
    .page-container {
        padding: var(--spacing-lg);
    }
    
    .page-header {
        flex-direction: column;
    }
    
    .header-actions {
        width: 100%;
    }
    
    .stats-grid,
    .quick-actions-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-row {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: var(--spacing-lg);
        border-top: 1px solid var(--gray-200);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-link {
        width: 100%;
        justify-content: flex-start;
    }
    
    .table-container {
        overflow-x: scroll;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .stats-row {
        grid-template-columns: 1fr;
    }
    
    .table-controls {
        flex-direction: column;
    }
    
    .search-container,
    .filter-container {
        width: 100%;
    }
    
    .filter-container {
        flex-direction: column;
    }
    
    .filter-select {
        width: 100%;
    }
}

/* ===================================
   Utility Classes
   =================================== */
.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}