:root {
    --primary-color: #2563eb;
    --secondary-color: #475569;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
}

.bg-gradient {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.sidebar {
    position: fixed;
    top: 56px;
    bottom: 0;
    left: 0;
    z-index: 100;
    padding: 48px 0 0;
    box-shadow: inset -1px 0 0 rgba(0, 0, 0, .1);
}

@media (max-width: 767.98px) {
    .sidebar {
        position: static;
        height: auto;
        padding-top: 0;
    }
}

.sidebar .nav-link {
    font-weight: 500;
    color: #333;
    padding: 0.75rem 1rem;
    transition: all 0.3s;
}

.sidebar .nav-link:hover {
    background-color: #f0f0f0;
    padding-left: 1.5rem;
}

.sidebar .nav-link.active {
    color: var(--primary-color);
    background-color: #e0e7ff;
}

.card {
    border-radius: 10px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.table-responsive {
    border-radius: 8px;
    overflow-x: auto;
}

.btn {
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.3s;
}

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

.btn-primary:hover {
    background-color: #1d4ed8;
    transform: translateY(-1px);
}

/* Mobile responsive */
@media (max-width: 768px) {
    .container {
        padding-left: 15px;
        padding-right: 15px;
    }
    
    h1, h2 {
        font-size: 1.5rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .btn {
        padding: 0.5rem 1rem;
    }
}

/* Animaciones */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

/* Estilos para impresión */
@media print {
    .no-print {
        display: none;
    }
    
    body {
        background: white;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}