body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
}

.navbar-brand {
    font-weight: bold;
    font-size: 1.5rem;
}

.card {
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 20px;
    border: none;
}

.card-header {
    background-color: #4a6fa5;
    color: white;
    font-weight: bold;
}

.btn-primary {
    background-color: #4a6fa5;
    border-color: #4a6fa5;
}

.btn-primary:hover {
    background-color: #3a5a80;
    border-color: #3a5a80;
}

.table th {
    background-color: #f1f5f9;
    font-weight: 600;
}

.jumbotron {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.footer {
    margin-top: 50px;
    padding: 20px 0;
    background-color: #343a40;
    color: white;
}

.sidebar {
    min-height: calc(100vh - 56px);
    background-color: #f8f9fa;
    border-right: 1px solid #dee2e6;
}

.sidebar .nav-link {
    color: #495057;
    padding: 10px 15px;
    border-radius: 5px;
    margin-bottom: 5px;
}

.sidebar .nav-link:hover {
    background-color: #e9ecef;
}

.sidebar .nav-link.active {
    background-color: #4a6fa5;
    color: white;
}