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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #f8f9fa;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

.navbar-brand {
    font-weight: 600;
    font-size: 1.25rem;
}

.card {
    border: none;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    transition: all 0.3s cubic-bezier(.25,.8,.25,1);
    margin-bottom: 1.5rem;
}

.card:hover {
    box-shadow: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
}

.card-header {
    background-color: #fff;
    border-bottom: 2px solid #f8f9fa;
    font-weight: 600;
}

.table {
    font-size: 0.9rem;
}

.table th {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
    color: #6c757d;
}

.badge {
    padding: 0.35em 0.65em;
    font-weight: 500;
}

.btn {
    font-weight: 500;
    border-radius: 0.25rem;
    transition: all 0.2s;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.progress {
    background-color: #e9ecef;
    border-radius: 0.25rem;
}

.progress-bar {
    font-size: 0.75rem;
    font-weight: 600;
}

footer {
    margin-top: auto;
}

.form-label {
    font-weight: 600;
    font-size: 0.875rem;
    color: #495057;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

.alert {
    border: none;
    border-radius: 0.25rem;
}

.nav-tabs .nav-link {
    color: #6c757d;
    font-weight: 500;
}

.nav-tabs .nav-link.active {
    color: var(--primary-color);
    font-weight: 600;
}

.list-group-item {
    border-left: none;
    border-right: none;
}

.list-group-item:first-child {
    border-top: none;
}

.list-group-item:last-child {
    border-bottom: none;
}

.display-5 {
    font-weight: 600;
    color: #212529;
}

@media (max-width: 768px) {
    .table {
        font-size: 0.8rem;
    }

    .btn-group-sm > .btn {
        padding: 0.25rem 0.5rem;
        font-size: 0.75rem;
    }

    .display-5 {
        font-size: 2rem;
    }
}

canvas {
    max-height: 300px;
}

.text-muted {
    color: #6c757d !important;
}

.bg-light {
    background-color: #f8f9fa !important;
}