:root {
    /* Colores Principales */
    --primary-color: #1e3a5f;
    --primary-dark: #152c47;
    --primary-light: #2a4d7a;
    --secondary-color: #ff6b35;
    --secondary-dark: #e55a28;
    
    /* Colores de Estado */
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    
    /* Tonos de Gris */
    --gray-50: #f8f9fa;
    --gray-100: #e9ecef;
    --gray-200: #dee2e6;
    --gray-300: #ced4da;
    --gray-400: #adb5bd;
    --gray-500: #6c757d;
    --gray-600: #495057;
    --gray-700: #343a40;
    --gray-800: #212529;
    --gray-900: #0d0e0f;
    
    /* Colores de Fondo */
    --bg-primary: #ffffff;
    --bg-secondary: #f4f6f9;
    --bg-dark: #1a1d23;
    
    /* Sombras */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.2);
    
    /* Transiciones */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Espaciado */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Bordes */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    
    /* Sidebar */
    --sidebar-width: 260px;
    --header-height: 70px;
}

/* ========================================
   Reset y Base
   ======================================== */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--gray-800);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ========================================
   Sidebar
   ======================================== */

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: linear-gradient(180deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    color: white;
    padding: var(--spacing-lg);
    overflow-y: auto;
    z-index: 1000;
    box-shadow: var(--shadow-xl);
    transition: transform var(--transition-normal);
}

.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
}

.sidebar::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.3);
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.5);
}

.logo-container {
    text-align: center;
    padding: var(--spacing-lg) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: var(--spacing-xl);
}

.logo-container i {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    color: var(--secondary-color);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.logo-container h1 {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-xs);
}

.tagline {
    font-size: 0.75rem;
    opacity: 0.7;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 500;
}

/* Navegación */
.nav-menu {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: transparent;
    border: none;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.nav-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 3px;
    background: var(--secondary-color);
    transform: scaleY(0);
    transition: transform var(--transition-fast);
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    transform: translateX(5px);
}

.nav-item:hover::before {
    transform: scaleY(1);
}

.nav-item.active {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    box-shadow: var(--shadow-md);
}

.nav-item.active::before {
    transform: scaleY(1);
}

.nav-item i {
    font-size: 1.1rem;
    width: 24px;
    text-align: center;
}

.sidebar-footer {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-info i {
    font-size: 2rem;
    color: var(--secondary-color);
}

.user-name {
    font-weight: 600;
    font-size: 0.9rem;
}

.user-role {
    font-size: 0.75rem;
    opacity: 0.7;
}

/* ========================================
   Main Content
   ======================================== */

.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    padding: var(--header-height) 0 0 0;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: var(--sidebar-width);
    right: 0;
    height: var(--header-height);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--gray-200);
    padding: 0 var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 999;
    box-shadow: var(--shadow-sm);
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-700);
    cursor: pointer;
}

.page-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box i {
    position: absolute;
    left: var(--spacing-md);
    color: var(--gray-400);
}

.search-box input {
    padding: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) 2.5rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius-lg);
    font-size: 0.9rem;
    width: 300px;
    transition: all var(--transition-fast);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(30, 58, 95, 0.1);
}

.notification-btn {
    position: relative;
    background: none;
    border: none;
    font-size: 1.3rem;
    color: var(--gray-600);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast);
}

.notification-btn:hover {
    background: var(--gray-100);
    color: var(--primary-color);
}

.notification-btn .badge {
    position: absolute;
    top: 0;
    right: 0;
    background: var(--danger-color);
    color: white;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 10px;
}

/* ========================================
   Tabs y Contenido
   ======================================== */

.tab-content {
    display: none;
    padding: var(--spacing-xl);
    animation: fadeIn var(--transition-normal);
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.tab-header h2 {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.tab-header h2 i {
    color: var(--secondary-color);
}

/* ========================================
   Dashboard
   ======================================== */

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

.stat-card {
    background: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    transition: all var(--transition-fast);
    border-left: 4px solid transparent;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: white;
}

.stat-icon.blue {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.stat-icon.green {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
}

.stat-icon.orange {
    background: linear-gradient(135deg, #ee9617 0%, #fe5196 100%);
}

.stat-icon.red {
    background: linear-gradient(135deg, #eb3349 0%, #f45c43 100%);
}

.stat-info h3 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: var(--spacing-xs);
}

.stat-info p {
    color: var(--gray-500);
    font-size: 0.9rem;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
}

.dashboard-card {
    background: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
}

.dashboard-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.recent-orders, .stock-alerts {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* ========================================
   Tablas
   ======================================== */

.table-container {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

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

.data-table thead {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
}

.data-table th {
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: left;
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table tbody tr {
    border-bottom: 1px solid var(--gray-200);
    transition: background var(--transition-fast);
}

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

.data-table td {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 0.9rem;
    color: var(--gray-700);
}

.data-table .empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--gray-400);
    font-style: italic;
}

/* Estado badges */
.status-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.status-badge.abierta {
    background: #e3f2fd;
    color: #1976d2;
}

.status-badge.cerrada {
    background: #e8f5e9;
    color: #388e3c;
}

.status-badge.pendiente {
    background: #fff3e0;
    color: #f57c00;
}

.status-badge.aprobada {
    background: #e8f5e9;
    color: #2e7d32;
}

.status-badge.rechazada {
    background: #ffebee;
    color: #c62828;
}

/* ========================================
   Botones
   ======================================== */

.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius-md);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-fast);
    text-decoration: none;
    font-family: inherit;
}

.btn i {
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

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

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

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

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

.btn-success:hover {
    background: #218838;
}

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

.btn-danger:hover {
    background: #c82333;
}

.btn-warning {
    background: var(--warning-color);
    color: var(--gray-800);
}

.btn-warning:hover {
    background: #e0a800;
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.8rem;
}

.action-buttons {
    display: flex;
    gap: var(--spacing-xs);
}

/* ========================================
   Modales
   ======================================== */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    animation: fadeIn var(--transition-fast);
    backdrop-filter: blur(4px);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-xl);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp var(--transition-normal);
}

.modal-content.modal-small {
    max-width: 400px;
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    padding: var(--spacing-lg) var(--spacing-xl);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
    border-radius: var(--border-radius-xl) var(--border-radius-xl) 0 0;
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.close-modal {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    font-size: 1.5rem;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.close-modal:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: rotate(90deg);
}

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

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

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.9rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius-md);
    font-size: 0.9rem;
    font-family: inherit;
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(30, 58, 95, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

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

/* ========================================
   Toast Notifications
   ======================================== */

.toast {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--success-color);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-weight: 500;
    z-index: 3000;
    transform: translateX(400px);
    transition: transform var(--transition-normal);
}

.toast.show {
    transform: translateX(0);
}

.toast i {
    font-size: 1.2rem;
}

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

.toast.warning {
    background: var(--warning-color);
    color: var(--gray-800);
}

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

/* ========================================
   Empty States
   ======================================== */

.empty-state {
    padding: var(--spacing-2xl);
    text-align: center;
    color: var(--gray-400);
}

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

@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.mobile-active {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .header {
        left: 0;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-xl: 1.5rem;
        --spacing-lg: 1rem;
    }
    
    .header {
        padding: 0 var(--spacing-md);
    }
    
    .search-box {
        display: none;
    }
    
    .page-title {
        font-size: 1.2rem;
    }
    
    .tab-content {
        padding: var(--spacing-md);
    }
    
    .table-container {
        overflow-x: auto;
    }
    
    .data-table {
        min-width: 800px;
    }
    
    .modal-content {
        width: 95%;
        margin: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}

/* ========================================
   Utilidades
   ======================================== */

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

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

.text-primary {
    color: var(--primary-color);
}

.text-success {
    color: var(--success-color);
}

.text-danger {
    color: var(--danger-color);
}

.text-muted {
    color: var(--gray-500);
}

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

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

.d-none {
    display: none;
}

.d-block {
    display: block;
}

.d-flex {
    display: flex;
}