body {
    background-color: #F4F7F6;
    font-family: '-apple-system', 'BlinkMacSystemFont', 'Segoe UI', 'Roboto', 'Helvetica Neue', 'Arial', 'sans-serif';
    color: #333333;
}

.header-gradient {
    background: linear-gradient(135deg, #4A90E2 0%, #50E3C2 100%);
    color: white;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Georgia', serif;
}

.card {
    border-radius: 8px;
    border: none;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.btn-primary {
    background-color: #4A90E2;
    border-color: #4A90E2;
    border-radius: 8px;
    padding: 10px 20px;
    font-weight: bold;
}

.btn-primary:hover {
    background-color: #357ABD;
    border-color: #357ABD;
}

.nav-tabs .nav-link {
    border-radius: 8px 8px 0 0;
    border-color: #dee2e6 #dee2e6 #fff;
}

.nav-tabs .nav-link.active {
    background-color: #fff;
    border-color: #dee2e6 #dee2e6 #fff;
    color: #4A90E2;
    font-weight: bold;
}

.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1055;
}