:root {
    --primary-color: #4a90e2;
    --secondary-color: #5cb85c;
    --accent-color: #f0ad4e;
    --danger-color: #d9534f;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
    --transition: all 0.3s ease;
}

body {
    background-color: var(--light-color);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

.navbar {
    background-color: var(--dark-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.navbar-brand {
    color: white !important;
    font-weight: 600;
    font-size: 1.5rem;
}

.card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.15);
}

.card-header {
    background-color: white;
    border-bottom: 2px solid var(--light-color);
    border-radius: 10px 10px 0 0 !important;
}

.btn {
    border-radius: 5px;
    padding: 0.5rem 1.5rem;
    font-weight: 500;
    transition: var(--transition);
}

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

.btn-primary:hover {
    background-color: darken(var(--primary-color), 10%);
    transform: translateY(-2px);
}

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

.table {
    margin-bottom: 0;
}

.table th {
    border-top: none;
    font-weight: 600;
    color: var(--dark-color);
}

.table td {
    vertical-align: middle;
}

.form-control {
    border-radius: 5px;
    padding: 0.75rem 1rem;
    border: 1px solid #ddd;
    transition: var(--transition);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(74, 144, 226, 0.25);
}

.alert {
    border-radius: 5px;
    border: none;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .table-responsive {
        margin: 0 -1rem;
    }
    
    .btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }
    
    .btn:last-child {
        margin-bottom: 0;
    }
}

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

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

/* Mejoras para las gráficas */
canvas {
    max-width: 100%;
    height: auto !important;
}

/* Estilos para la tabla de estadísticas */
.table-stats {
    font-size: 0.9rem;
}

.table-stats th {
    font-weight: 600;
    background-color: rgba(0,0,0,0.02);
}