/* ============================================
   2026 Modern UI System - Blue & White Theme
   ============================================ */

/* CSS Custom Properties */
:root {
    /* Primary Colors */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-200: #bfdbfe;
    --primary-300: #93c5fd;
    --primary-400: #60a5fa;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-800: #1e40af;
    --primary-900: #1e3a8a;
    
    /* Neutral Colors */
    --neutral-50: #f8fafc;
    --neutral-100: #f1f5f9;
    --neutral-200: #e2e8f0;
    --neutral-300: #cbd5e1;
    --neutral-400: #94a3b8;
    --neutral-500: #64748b;
    --neutral-600: #475569;
    --neutral-700: #334155;
    --neutral-800: #1e293b;
    --neutral-900: #0f172a;
    
    /* Semantic Colors */
    --success: #10b981;
    --success-light: #d1fae5;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --error: #ef4444;
    --error-light: #fee2e2;
    --info: #3b82f6;
    --info-light: #dbeafe;
    
    /* Layout */
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 72px;
    --header-height: 64px;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 24px 64px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.15);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
}

/* Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-sans);
    background: var(--neutral-50);
    color: var(--neutral-800);
    line-height: 1.6;
    min-height: 100vh;
}

/* ============================================
   Layout System
   ============================================ */

.layout {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
    border-right: 1px solid var(--neutral-200);
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-base), width var(--transition-base);
}

.sidebar-logo {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--neutral-200);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.sidebar-logo .logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-700) 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
    font-weight: 700;
    flex-shrink: 0;
}

.sidebar-logo h1 {
    font-size: 18px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-800) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.3;
}

.sidebar-logo p {
    font-size: 12px;
    color: var(--neutral-500);
    margin-top: 2px;
}

.sidebar-nav {
    flex: 1;
    padding: var(--spacing-md) 0;
}

.sidebar-nav ul {
    list-style: none;
    padding: 0 var(--spacing-sm);
}

.sidebar-nav li {
    margin-bottom: 2px;
}

.sidebar-nav li a {
    display: flex;
    align-items: center;
    padding: 10px var(--spacing-md);
    color: var(--neutral-600);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    font-size: 14px;
    font-weight: 500;
    gap: var(--spacing-sm);
}

.sidebar-nav li a:hover {
    color: var(--primary-600);
    background: var(--primary-50);
}

.sidebar-nav li a.active {
    color: var(--primary-600);
    background: var(--primary-50);
    font-weight: 600;
}

.sidebar-nav li a i,
.sidebar-nav li a svg.icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    opacity: 0.7;
}

.sidebar-nav li a.active i,
.sidebar-nav li a.active svg.icon {
    opacity: 1;
}

.sidebar-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--neutral-200);
}

.btn-logout {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 10px var(--spacing-md);
    color: var(--error);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    font-size: 14px;
    font-weight: 500;
}

.btn-logout:hover {
    background: var(--error-light);
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: margin-left var(--transition-base);
}

.main-header {
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--neutral-200);
    padding: 0 var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 50;
}

.breadcrumb {
    font-size: 16px;
    font-weight: 600;
    color: var(--neutral-800);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 14px;
    color: var(--neutral-600);
}

.content-area {
    flex: 1;
    padding: var(--spacing-xl);
}

/* ============================================
   Components
   ============================================ */

/* Cards */
.card {
    background: #ffffff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--neutral-200);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    transition: all var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--neutral-800);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--neutral-200);
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: #ffffff;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--neutral-200);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-400), var(--primary-600));
    opacity: 0;
    transition: opacity var(--transition-fast);
}

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

.stat-card:hover::before {
    opacity: 1;
}

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    flex-shrink: 0;
}

.stat-icon.blue {
    background: linear-gradient(135deg, var(--primary-100) 0%, var(--primary-200) 100%);
    color: var(--primary-600);
}

.stat-icon.green {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
    color: var(--success);
}

.stat-icon.orange {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    color: var(--warning);
}

.stat-icon.purple {
    background: linear-gradient(135deg, #ede9fe 0%, #ddd6fe 100%);
    color: #7c3aed;
}

.stat-icon.red {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    color: var(--error);
}

.stat-icon.cyan {
    background: linear-gradient(135deg, #cffafe 0%, #a5f3fc 100%);
    color: #0891b2;
}

.stat-content h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--neutral-900);
    line-height: 1.2;
}

.stat-content p {
    color: var(--neutral-500);
    font-size: 14px;
    margin-top: 4px;
}

/* Page Header */
.page-header {
    margin-bottom: var(--spacing-xl);
}

.page-header h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--neutral-900);
    line-height: 1.3;
}

.page-header p {
    color: var(--neutral-500);
    margin-top: 4px;
    font-size: 14px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

.btn i {
    font-size: 16px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
    color: white;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.25);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-700) 100%);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.35);
    transform: translateY(-1px);
}

.btn-default {
    background: #ffffff;
    border: 1px solid var(--neutral-300);
    color: var(--neutral-700);
}

.btn-default:hover {
    border-color: var(--primary-400);
    color: var(--primary-600);
    background: var(--primary-50);
}

.btn-success {
    background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, var(--error) 0%, #dc2626 100%);
    color: white;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
}

.btn-group {
    display: flex;
    gap: var(--spacing-sm);
}

/* Forms */
.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.form-item {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--neutral-700);
    margin-bottom: var(--spacing-sm);
}

.form-label.required::after {
    content: '*';
    color: var(--error);
    margin-left: 4px;
}

.form-control {
    max-width: 100%;
}

.form-input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--neutral-300);
    border-radius: var(--radius-md);
    font-size: 14px;
    color: var(--neutral-800);
    background: #ffffff;
    transition: all var(--transition-fast);
}

.form-input:focus {
    border-color: var(--primary-500);
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-input::placeholder {
    color: var(--neutral-400);
}

.form-textarea {
    min-height: 100px;
    resize: vertical;
    font-family: var(--font-mono);
}

.form-select {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--neutral-300);
    border-radius: var(--radius-md);
    font-size: 14px;
    color: var(--neutral-800);
    background: #ffffff;
    cursor: pointer;
    transition: all var(--transition-fast);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.form-select:focus {
    border-color: var(--primary-500);
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-hint {
    font-size: 12px;
    color: var(--neutral-500);
    margin-top: var(--spacing-xs);
}

/* Switch */
.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--neutral-300);
    transition: var(--transition-fast);
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: var(--transition-fast);
    border-radius: 50%;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

input:checked + .slider {
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
}

input:checked + .slider:before {
    transform: translateX(20px);
}

/* Tables */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--neutral-200);
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.table thead th {
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
    color: var(--neutral-600);
    background: var(--neutral-50);
    border-bottom: 1px solid var(--neutral-200);
    white-space: nowrap;
}

.table tbody td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--neutral-100);
    color: var(--neutral-700);
}

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

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

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

/* Tags */
.tag {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 500;
}

.tag-blue {
    background: var(--primary-100);
    color: var(--primary-700);
}

.tag-green {
    background: var(--success-light);
    color: #047857;
}

.tag-red {
    background: var(--error-light);
    color: #b91c1c;
}

.tag-yellow {
    background: var(--warning-light);
    color: #b45309;
}

.tag-purple {
    background: #ede9fe;
    color: #6d28d9;
}

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

/* Tabs */
.tabs {
    display: flex;
    gap: 4px;
    border-bottom: 1px solid var(--neutral-200);
    margin-bottom: var(--spacing-lg);
    overflow-x: auto;
}

.tabs a {
    padding: 12px 20px;
    color: var(--neutral-600);
    text-decoration: none;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
    font-size: 14px;
    font-weight: 500;
    white-space: nowrap;
}

.tabs a:hover {
    color: var(--primary-600);
}

.tabs a.active {
    color: var(--primary-600);
    border-bottom-color: var(--primary-600);
}

/* Pagination */
.pagination {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--neutral-200);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.pagination-info {
    font-size: 14px;
    color: var(--neutral-500);
}

.pagination-btns {
    display: flex;
    gap: 6px;
}

.pagination-btns button {
    min-width: 36px;
    height: 36px;
    padding: 0 12px;
    border: 1px solid var(--neutral-300);
    background: #ffffff;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 14px;
    color: var(--neutral-700);
}

.pagination-btns button:hover {
    border-color: var(--primary-400);
    color: var(--primary-600);
    background: var(--primary-50);
}

.pagination-btns button.active {
    background: var(--primary-600);
    color: #ffffff;
    border-color: var(--primary-600);
}

/* Filter Bar */
.filter-bar {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.search-input {
    padding: 10px 14px;
    border: 1px solid var(--neutral-300);
    border-radius: var(--radius-md);
    font-size: 14px;
    width: 240px;
    transition: all var(--transition-fast);
}

.search-input:focus {
    border-color: var(--primary-500);
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.filter-select {
    padding: 10px 14px;
    border: 1px solid var(--neutral-300);
    border-radius: var(--radius-md);
    font-size: 14px;
    background: #ffffff;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-select:focus {
    border-color: var(--primary-500);
    outline: none;
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(4px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: #ffffff;
    border-radius: var(--radius-xl);
    width: 520px;
    max-width: 100%;
    max-height: 90vh;
    overflow: auto;
    box-shadow: var(--shadow-xl);
}

.modal-header {
    padding: var(--spacing-lg) var(--spacing-xl);
    border-bottom: 1px solid var(--neutral-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--neutral-900);
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--neutral-400);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

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

.modal-body {
    padding: var(--spacing-xl);
}

.modal-footer {
    padding: var(--spacing-lg) var(--spacing-xl);
    border-top: 1px solid var(--neutral-200);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
}

/* Toast */
.toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 1100;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    padding: 14px 24px;
    border-radius: var(--radius-md);
    color: #ffffff;
    font-size: 14px;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.toast-success {
    background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
}

.toast-error {
    background: linear-gradient(135deg, var(--error) 0%, #dc2626 100%);
}

.toast-info {
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
}

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

/* Charts Grid */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.chart-card {
    background: #ffffff;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--neutral-200);
}

.chart-card h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--neutral-800);
}

/* Empty State */
.empty-row {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-lg);
    color: var(--neutral-400);
}

.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--neutral-500);
}

.empty-state svg {
    width: 64px;
    height: 64px;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

/* Link Buttons */
.btn-link {
    background: none;
    border: none;
    color: var(--primary-600);
    cursor: pointer;
    font-size: 14px;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.btn-link:hover {
    color: var(--primary-700);
    background: var(--primary-50);
}

.btn-link-danger {
    color: var(--error);
}

.btn-link-danger:hover {
    color: #dc2626;
    background: var(--error-light);
}

/* ============================================
   Responsive Design
   ============================================ */

/* Mobile Menu Toggle */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    color: var(--neutral-700);
}

.mobile-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 90;
}

@media (max-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .charts-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .mobile-overlay.active {
        display: block;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .main-header {
        padding: 0 var(--spacing-md);
    }
    
    .content-area {
        padding: var(--spacing-md);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .filter-bar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .search-input {
        width: 100%;
    }
    
    .btn-group {
        margin-left: 0;
        width: 100%;
    }
    
    .btn-group .btn {
        flex: 1;
    }
    
    .pagination {
        flex-direction: column;
        align-items: center;
    }
    
    .card {
        padding: var(--spacing-md);
    }
    
    .table-container {
        margin: 0 calc(-1 * var(--spacing-md));
        border-radius: 0;
        border-left: none;
        border-right: none;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .page-header h1 {
        font-size: 20px;
    }
    
    .stat-card {
        padding: var(--spacing-md);
    }
    
    .stat-icon {
        width: 48px;
        height: 48px;
        font-size: 20px;
    }
    
    .stat-content h3 {
        font-size: 24px;
    }
}

/* ============================================
   Utility Classes
   ============================================ */

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

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }

.text-sm { font-size: 13px; }
.text-lg { font-size: 18px; }
.text-xl { font-size: 20px; }
.text-2xl { font-size: 24px; }

.text-gray-400 { color: var(--neutral-400); }
.text-gray-500 { color: var(--neutral-500); }
.text-gray-600 { color: var(--neutral-600); }
.text-gray-700 { color: var(--neutral-700); }
.text-blue-600 { color: var(--primary-600); }
.text-red-600 { color: var(--error); }
.text-green-600 { color: var(--success); }

.mb-1 { margin-bottom: 4px; }
.mb-2 { margin-bottom: 8px; }
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }
.mt-4 { margin-top: 16px; }
.mr-2 { margin-right: 8px; }
.ml-2 { margin-left: 8px; }

.p-4 { padding: 16px; }
.p-6 { padding: 24px; }
.px-4 { padding-left: 16px; padding-right: 16px; }
.py-2 { padding-top: 8px; padding-bottom: 8px; }
.py-3 { padding-top: 12px; padding-bottom: 12px; }

.w-full { width: 100%; }
.flex { display: flex; }
.flex-1 { flex: 1; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-4 { gap: 16px; }
.gap-6 { gap: 24px; }

.rounded { border-radius: 4px; }
.rounded-lg { border-radius: 8px; }
.rounded-xl { border-radius: 12px; }

.overflow-x-auto { overflow-x: auto; }
.overflow-hidden { overflow: hidden; }

.truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.max-w-xs { max-width: 320px; }

.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }

.relative { position: relative; }
.fixed { position: fixed; }

.bg-white { background-color: #ffffff; }
.bg-gray-50 { background-color: var(--neutral-50); }
.bg-gray-100 { background-color: var(--neutral-100); }
.bg-blue-100 { background-color: var(--primary-100); }
.bg-green-100 { background-color: var(--success-light); }
.bg-red-100 { background-color: var(--error-light); }
.bg-yellow-100 { background-color: var(--warning-light); }

.border { border-width: 1px; }
.border-b { border-bottom-width: 1px; }

.hover\:bg-gray-50:hover { background-color: var(--neutral-50); }
.hover\:bg-gray-100:hover { background-color: var(--neutral-100); }
.hover\:text-blue-800:hover { color: var(--primary-800); }
.hover\:text-red-800:hover { color: #991b1b; }

.transition { transition: all var(--transition-base); }

/* Image Preview */
.image-preview {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-md);
    border: 1px solid var(--neutral-200);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--neutral-50);
}

.image-preview img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.image-preview .placeholder {
    color: var(--neutral-400);
    font-size: 12px;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--neutral-300);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--neutral-400);
}

/* Focus Visible */
:focus-visible {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .sidebar, .main-header, .btn, .filter-bar {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0 !important;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}