:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --info-color: #0dcaf0;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --light-color: #f8f9fa;
    --dark-color: #212529;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
    color: #333;
    line-height: 1.6;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
}

.card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

.card-header {
    border-radius: 10px 10px 0 0 !important;
    font-weight: 600;
}

.nav-tabs .nav-link {
    color: var(--primary-color);
    font-weight: 500;
}

.nav-tabs .nav-link.active {
    font-weight: 600;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    font-weight: 500;
}

.btn-primary:hover {
    background-color: #0b5ed7;
    border-color: #0a58ca;
}

.form-control:focus {
    border-color: #86b7fe;
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

.alert {
    border-radius: 8px;
}

footer {
    margin-top: auto;
}

footer a {
    text-decoration: none;
    transition: all 0.3s ease;
}

footer a:hover {
    color: white !important;
    text-decoration: underline;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .display-4 {
        font-size: 2.5rem;
    }
    
    .card-body {
        padding: 1rem;
    }
}

/* Chart container styling */
.chart-container {
    position: relative;
    height: 200px;
    width: 100%;
}

/* Custom animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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