/* EpiERP - Modern ERP System Styles */

/* ==========================================
   CSS CUSTOM PROPERTIES (CSS VARIABLES)
   ========================================== */
:root {
    /* Primary Colors */
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #93c5fd;
    --primary-rgb: 59, 130, 246;
    
    /* Secondary Colors */
    --secondary: #6b7280;
    --secondary-dark: #4b5563;
    --secondary-light: #9ca3af;
    
    /* Status Colors */
    --success: #10b981;
    --success-light: #d1fae5;
    --info: #06b6d4;
    --info-light: #cffafe;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --danger: #ef4444;
    --danger-light: #fee2e2;
    
    /* Neutral Colors */
    --light: #f8fafc;
    --dark: #1e293b;
    --white: #ffffff;
    --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;
    
    /* Background Colors */
    --body-bg: #f8fafc;
    --body-color: #1e293b;
    --card-bg: #ffffff;
    --navbar-bg: #ffffff;
    --sidebar-bg: #ffffff;
    --sidebar-width: 280px;
    
    /* Border */
    --border-width: 1px;
    --border-color: #e5e7eb;
    --border-radius: 0.5rem;
    --border-radius-sm: 0.375rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    
    /* Shadow */
    --box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --box-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --box-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --box-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --box-shadow-inset: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
    
    /* Typography */
    --font-family-sans-serif: 'Inter', system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    --font-family-monospace: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    --font-size-base: 1rem;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --line-height-base: 1.5;
    
    /* Spacing */
    --spacer: 1rem;
    
    /* Transitions */
    --transition-base: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fade: opacity 0.15s linear;
    --transition-collapse: height 0.35s ease;
}

/* ==========================================
   GLOBAL STYLES
   ========================================== */
* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-family-sans-serif);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-base);
    color: var(--body-color);
    background-color: var(--body-bg);
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}

/* ==========================================
   LAYOUT COMPONENTS
   ========================================== */

/* Sidebar Styles */
.sidebar {
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    min-height: 100vh;
    box-shadow: var(--box-shadow-sm);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
}

.sidebar-header {
    padding: 1.5rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.sidebar-brand {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: white !important;
}

.sidebar-nav {
    padding: 1rem 0;
    flex: 1;
    overflow-y: auto;
}

.sidebar .nav-link {
    display: flex;
    align-items: center;
    padding: 0.875rem 1.25rem;
    color: var(--gray-700);
    text-decoration: none;
    border-radius: 0;
    border: none;
    transition: var(--transition-base);
    position: relative;
    font-weight: var(--font-weight-medium);
    font-size: 0.9rem;
    margin: 0 0.5rem;
    border-radius: var(--border-radius-sm);
}

.sidebar .nav-link:hover {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    color: var(--primary);
    transform: translateX(4px);
}

.sidebar .nav-link.active {
    background: transparent;
    color: #336699;
    font-weight: var(--font-weight-semibold);
}

.sidebar .nav-link i {
    width: 1.5rem;
    margin-right: 0.75rem;
    text-align: center;
    font-size: 1.125rem;
}

/* Submenu Styles */
.sidebar .submenu-arrow {
    margin-left: auto;
    font-size: 0.75rem;
    transition: transform 0.3s ease;
    opacity: 0.7;
}

.sidebar .nav-link[aria-expanded="true"] .submenu-arrow {
    transform: rotate(180deg);
}

.sidebar .submenu {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    margin: 0.25rem 0.5rem;
    padding: 0.5rem 0;
    list-style: none;
    border-radius: var(--border-radius);
    border: 1px solid var(--gray-200);
    box-shadow: var(--box-shadow-sm);
}

.sidebar .submenu .nav-link {
    padding: 0.5rem 1rem 0.5rem 2.5rem;
    font-size: 0.85rem;
    background: transparent;
    color: var(--gray-600);
    font-weight: var(--font-weight-normal);
    position: relative;
    margin: 0.25rem 0.5rem;
}

.sidebar .submenu .nav-link::before {
    content: '';
    position: absolute;
    left: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    background: var(--gray-400);
    border-radius: 50%;
    transition: var(--transition-base);
}

.sidebar .submenu .nav-link:hover {
    background: linear-gradient(135deg, #e2e8f0 0%, #cbd5e1 100%);
    color: var(--gray-700);
    transform: translateX(6px);
}

.sidebar .submenu .nav-link:hover::before {
    background: var(--primary);
    transform: translateY(-50%) scale(1.3);
}

.sidebar .submenu .nav-link.active {
    background: transparent;
    color: #336699;
    font-weight: var(--font-weight-medium);
}

.sidebar .submenu .nav-link.active::before {
    background: white;
    transform: translateY(-50%) scale(1.4);
}

/* Main Content Area */
.main-content {
    background: var(--body-bg);
    min-height: 100vh;
    margin-left: var(--sidebar-width);
    width: calc(100% - var(--sidebar-width));
}

/* Top Navigation */
.topbar {
    background: var(--navbar-bg);
    box-shadow: var(--box-shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1020;
    border-bottom: 1px solid var(--border-color);
}

/* User Avatar */
.user-avatar {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-semibold);
    font-size: 0.875rem;
    box-shadow: var(--box-shadow);
}

/* Responsive Design */
@media (max-width: 991.98px) {
    .sidebar {
        display: none !important;
    }
}

/* ==========================================
   ENHANCED COMPONENT STYLES
   ========================================== */

/* Cards with Modern Design */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow);
    transition: var(--transition-base);
    overflow: hidden;
}

.card:hover {
    box-shadow: var(--box-shadow-lg);
    transform: translateY(-2px);
    border-color: var(--primary-light);
}

.card-header {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem;
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-lg);
    color: var(--gray-800);
}

.card-body {
    padding: 2rem;
}

/* Enhanced Breadcrumb */
.breadcrumb {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    border-radius: var(--border-radius);
    padding: 1rem 1.5rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--box-shadow-sm);
}

.breadcrumb-item a {
    color: var(--primary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: var(--transition-base);
}

.breadcrumb-item a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

.breadcrumb-item.active {
    color: var(--gray-600);
    font-weight: var(--font-weight-medium);
}

/* Page Header Enhancement */
.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2.5rem 0;
    margin-bottom: 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow-lg);
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.page-header .container {
    position: relative;
    z-index: 1;
}

/* Enhanced Buttons */
.btn {
    border-radius: var(--border-radius);
    font-weight: var(--font-weight-medium);
    transition: var(--transition-base);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: var(--font-size-base);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border: none;
    color: white;
    box-shadow: var(--box-shadow);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, #1d4ed8 100%);
    transform: translateY(-1px);
    box-shadow: var(--box-shadow-lg);
    color: white;
}

.btn-secondary {
    background: linear-gradient(135deg, var(--gray-600) 0%, var(--gray-700) 100%);
    border: none;
    color: white;
    box-shadow: var(--box-shadow);
}

.btn-secondary:hover {
    background: linear-gradient(135deg, var(--gray-700) 0%, var(--gray-800) 100%);
    transform: translateY(-1px);
    color: white;
}

.btn-outline-primary {
    background: white;
    border: 2px solid var(--primary);
    color: var(--primary);
}

.btn-outline-primary:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
    transform: translateY(-1px);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: var(--font-size-sm);
}

/* Circular Action Buttons */
.btn-circle {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-base);
}

.btn-circle:hover {
    transform: scale(1.1);
}

/* Enhanced Filter Section */
.filter-section {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--box-shadow);
}

.filter-group {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.filter-group .form-control,
.filter-group .form-select {
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    transition: var(--transition-base);
    background: white;
    box-shadow: var(--box-shadow-sm);
}

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

/* Enhanced Table Design */
.table-container {
    background: white;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    border: 1px solid var(--border-color);
}

.table {
    margin-bottom: 0;
    background: white;
}

.table thead th {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    border-bottom: 2px solid var(--border-color);
    font-weight: var(--font-weight-semibold);
    color: var(--gray-800);
    padding: 1.25rem 1rem;
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    position: sticky;
    top: 0;
    z-index: 10;
}

.table tbody td {
    padding: 1.25rem 1rem;
    vertical-align: middle;
    border-top: 1px solid var(--gray-200);
    color: var(--gray-700);
}

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

.table tbody tr:hover {
    background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.02) 0%, rgba(var(--primary-rgb), 0.05) 100%);
}

/* Enhanced Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--gray-600);
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    border-radius: var(--border-radius-lg);
    border: 2px dashed var(--border-color);
}

.empty-state i {
    font-size: 4rem;
    color: var(--gray-400);
    margin-bottom: 1.5rem;
    display: block;
}

.empty-state h3 {
    color: var(--gray-700);
    margin-bottom: 1rem;
    font-weight: var(--font-weight-semibold);
}

.empty-state p {
    margin-bottom: 2rem;
    color: var(--gray-600);
}

/* Enhanced Status Badges */
.badge {
    font-size: 0.75rem;
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-weight: var(--font-weight-medium);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.badge-warning {
    background: linear-gradient(135deg, var(--warning) 0%, #d97706 100%);
    color: white;
}

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

.badge-info {
    background: linear-gradient(135deg, var(--info) 0%, #0891b2 100%);
    color: white;
}

/* Enhanced Form Controls */
.form-label {
    font-weight: var(--font-weight-semibold);
    color: var(--gray-700);
    margin-bottom: 0.5rem;
    font-size: var(--font-size-sm);
}

.form-control {
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    transition: var(--transition-base);
    background: white;
    box-shadow: var(--box-shadow-sm);
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.1);
    outline: none;
}

/* Enhanced Alerts */
.alert {
    border-radius: var(--border-radius);
    border: none;
    padding: 1rem 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--box-shadow);
}

.alert-success {
    background: linear-gradient(135deg, var(--success-light) 0%, #a7f3d0 100%);
    color: #065f46;
    border-left: 4px solid var(--success);
}

.alert-danger {
    background: linear-gradient(135deg, var(--danger-light) 0%, #fecaca 100%);
    color: #991b1b;
    border-left: 4px solid var(--danger);
}

.alert-warning {
    background: linear-gradient(135deg, var(--warning-light) 0%, #fed7aa 100%);
    color: #92400e;
    border-left: 4px solid var(--warning);
}

.alert-info {
    background: linear-gradient(135deg, var(--info-light) 0%, #a5f3fc 100%);
    color: #0e7490;
    border-left: 4px solid var(--info);
}

/* Enhanced Pagination */
.pagination {
    margin-bottom: 0;
}

.page-link {
    color: var(--primary);
    border-color: var(--border-color);
    padding: 0.75rem 1rem;
    transition: var(--transition-base);
}

.page-link:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
    transform: translateY(-1px);
}

.page-item.active .page-link {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-color: var(--primary);
    box-shadow: var(--box-shadow);
}

/* Enhanced Dropdowns */
.dropdown-menu {
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--box-shadow-lg);
    padding: 0.5rem 0;
}

.dropdown-item {
    padding: 0.75rem 1.5rem;
    transition: var(--transition-base);
    color: var(--gray-700);
    font-weight: var(--font-weight-medium);
}

.dropdown-item:hover {
    background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-200) 100%);
    color: var(--gray-800);
}

/* Enhanced Action Buttons */
.action-buttons {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
}

.action-buttons .btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    padding: 0;
    transition: var(--transition-base);
}

.action-buttons .btn:hover {
    transform: scale(1.1);
}

/* Loading States */
.loading-shimmer {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200px 100%;
    animation: shimmer 1.5s ease-in-out infinite;
}

@keyframes shimmer {
    0% {
        background-position: -200px 0;
    }
    100% {
        background-position: calc(200px + 100%) 0;
    }
}

/* Smooth Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--gray-400) 0%, var(--gray-500) 100%);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, var(--gray-500) 0%, var(--gray-600) 100%);
}

/* Responsive Improvements */
@media (max-width: 768px) {
    .filter-group {
        flex-direction: column;
        align-items: stretch;
    }
    
    .action-buttons {
        flex-wrap: wrap;
    }
    
    .card-body {
        padding: 1.5rem;
    }
    
    .btn {
        padding: 0.625rem 1.25rem;
        font-size: var(--font-size-sm);
    }
    
    .table thead th,
    .table tbody td {
        padding: 1rem 0.75rem;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.5s ease-out;
}

.slide-up {
    animation: slideUp 0.5s ease-out;
}

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

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

/* Utility Classes */
.shadow-hover {
    transition: var(--transition-base);
}

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

.text-gradient {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: var(--font-weight-bold);
}

/* Toast Notifications */
.toast {
    border-radius: var(--border-radius);
    border: none;
    box-shadow: var(--box-shadow-xl);
    backdrop-filter: blur(10px);
}

.toast-success {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.9) 0%, rgba(5, 150, 105, 0.9) 100%);
    color: white;
}

.toast-error {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.9) 0%, rgba(220, 38, 38, 0.9) 100%);
    color: white;
}

.toast-warning {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.9) 0%, rgba(217, 119, 6, 0.9) 100%);
    color: white;
}

/* Print Styles */
@media print {
    .sidebar,
    .topbar,
    .btn,
    .pagination {
        display: none !important;
    }
    
    .main-content {
        margin: 0 !important;
        padding: 0 !important;
    }
    
    .card {
        box-shadow: none !important;
        border: 1px solid #000 !important;
    }
}

/* Sidebar User Info - Fixed at bottom */
.sidebar .user-info {
    margin-top: auto;
    border-top: 1px solid var(--border-color);
    background: rgba(0,0,0,0.02);
    flex-shrink: 0;
}