:root {
    --color-primary: #000000;
    --color-secondary: #1a1a1a;
    --color-accent: #2d2d2d;
    --color-bg: #f5f5f5;
    --color-bg-secondary: #ffffff;
    --color-text: #1a1a1a;
    --color-text-light: #666666;
    --color-text-lighter: #999999;
    --color-border: #e0e0e0;
    --color-success: #2d2d2d;
    --color-error: #666666;
    --color-hover: #3d3d3d;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   NAVBAR
======================================== */
.navbar {
    background-color: var(--color-primary);
    color: white;
    padding: 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-brand h1 {
    font-size: 20px;
    font-weight: 600;
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xs);
}

.nav-menu a {
    color: rgba(255,255,255,0.85);
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    font-weight: 500;
    font-size: 15px;
    transition: var(--transition);
}

.nav-menu a:hover {
    background-color: var(--color-hover);
    color: white;
}

.nav-menu a.active {
    background-color: var(--color-bg-secondary);
    color: var(--color-primary);
}

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

.user-name {
    font-weight: 600;
    font-size: 15px;
}

.user-rol {
    font-size: 13px;
    color: rgba(255,255,255,0.7);
    padding: 4px 12px;
    background-color: var(--color-hover);
    border-radius: 20px;
}

.btn-logout {
    color: rgba(255,255,255,0.85);
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    font-weight: 500;
    font-size: 15px;
    transition: var(--transition);
    border: 1px solid rgba(255,255,255,0.2);
}

.btn-logout:hover {
    background-color: rgba(255,255,255,0.1);
    color: white;
}

/* ========================================
   MAIN CONTENT
======================================== */
.main-content {
    flex: 1;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

/* ========================================
   LOGIN PAGE
======================================== */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
}

.login-box {
    background-color: var(--color-bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 450px;
}

.login-box h1 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.login-box p {
    font-size: 16px;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
}

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

.form-group label {
    display: block;
    font-weight: 600;
    font-size: 14px;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-control {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: 16px;
    font-family: 'Inter', sans-serif;
    transition: var(--transition);
    background-color: var(--color-bg-secondary);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0,0,0,0.05);
}

select.form-control {
    cursor: pointer;
    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='%231a1a1a' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

/* ========================================
   BUTTONS
======================================== */
.btn {
    padding: 14px 28px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
    text-align: center;
    font-family: 'Inter', sans-serif;
}

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

.btn-primary:hover {
    background-color: var(--color-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.btn-secondary {
    background-color: var(--color-bg);
    color: var(--color-text);
    border: 2px solid var(--color-border);
}

.btn-secondary:hover {
    background-color: var(--color-border);
}

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

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

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

.btn-danger:hover {
    background-color: #555555;
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 14px;
}

/* ========================================
   ALERTS
======================================== */
.alert {
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
    font-size: 15px;
    font-weight: 500;
}

.alert-success {
    background-color: #f0f0f0;
    color: var(--color-text);
    border-left: 4px solid var(--color-primary);
}

.alert-error {
    background-color: #f5f5f5;
    color: var(--color-text);
    border-left: 4px solid var(--color-error);
}

/* ========================================
   CARDS
======================================== */
.card {
    background-color: var(--color-bg-secondary);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
}

.card-header {
    padding: var(--spacing-lg);
    border-bottom: 2px solid var(--color-bg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-primary);
}

.card-body {
    padding: var(--spacing-lg);
}

/* ========================================
   STATS CARDS
======================================== */
.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-color: var(--color-bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    border-left: 4px solid var(--color-primary);
}

.stat-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-sm);
}

.stat-value {
    font-size: 36px;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
}

/* ========================================
   TABLES
======================================== */
.table-container {
    overflow-x: auto;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--color-bg-secondary);
}

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

th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    font-size: 15px;
}

tbody tr {
    transition: var(--transition);
}

tbody tr:hover {
    background-color: var(--color-bg);
}

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

/* ========================================
   FILTERS
======================================== */
.filters {
    background-color: var(--color-bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.filters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

/* ========================================
   EDITABLE TABLE (Registro Masivo)
======================================== */
.editable-table {
    width: 100%;
    border-collapse: collapse;
}

.editable-table input[type="number"],
.editable-table input[type="text"] {
    width: 100%;
    padding: 10px;
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: 15px;
    font-family: 'Inter', sans-serif;
}

.editable-table input[type="number"]:focus,
.editable-table input[type="text"]:focus {
    outline: none;
    border-color: var(--color-primary);
}

/* ========================================
   ACTIONS
======================================== */
.actions {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-action {
    padding: 6px 12px;
    font-size: 13px;
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

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

.btn-edit:hover {
    background-color: var(--color-hover);
}

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

.btn-delete:hover {
    background-color: #555555;
}

/* ========================================
   FOOTER
======================================== */
.footer {
    background-color: var(--color-primary);
    color: rgba(255,255,255,0.7);
    padding: var(--spacing-lg);
    text-align: center;
    margin-top: auto;
}

.footer p {
    font-size: 14px;
}

/* ========================================
   RESPONSIVE
======================================== */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        height: auto;
        padding: var(--spacing-md);
    }
    
    .nav-menu {
        flex-direction: column;
        width: 100%;
        margin: var(--spacing-md) 0;
    }
    
    .nav-user {
        flex-direction: column;
        width: 100%;
        gap: var(--spacing-sm);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .filters-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   UTILITIES
======================================== */
.text-right {
    text-align: right;
}

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

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

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

/* ========================================
   GRÁFICOS Y VISUALIZACIONES
======================================== */
canvas {
    max-width: 100%;
    height: auto;
}

.chart-container {
    position: relative;
    min-height: 300px;
    padding: var(--spacing-md);
}

/* Mejoras para las tarjetas de estadísticas con gradientes */
.stat-card {
    transition: var(--transition);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.12);
}

/* Grid responsive para gráficos */
@media (max-width: 768px) {
    [style*="grid-template-columns"] {
        grid-template-columns: 1fr !important;
    }
    
    canvas {
        height: 250px !important;
    }
}

/* Animación de carga para gráficos */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card {
    animation: fadeInUp 0.5s ease-out;
}

/* Estilos para tooltips de gráficos mejorados */
.chartjs-tooltip {
    background: var(--color-primary) !important;
    border-radius: var(--border-radius);
    color: white !important;
    font-family: 'Inter', sans-serif;
    padding: var(--spacing-sm);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}