:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --danger-color: #dc3545;
    --light-bg: #f8f9fa;
}

body {
    background-color: var(--light-bg);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.navbar-brand {
    font-weight: 600;
}

.card {
    border: none;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    margin-bottom: 1.5rem;
}

.card-header {
    background-color: #fff;
    border-bottom: 1px solid rgba(0,0,0,.05);
    font-weight: 600;
}

.status-badge {
    padding: 0.35em 0.65em;
    font-size: 0.75em;
    font-weight: 700;
    border-radius: 0.25rem;
}

.status-normal {
    background-color: var(--success-color);
    color: white;
}

.status-low {
    background-color: #ffc107;
    color: black;
}

.status-severe {
    background-color: var(--danger-color);
    color: white;
}

.login-container {
    max-width: 400px;
    margin: 100px auto;
}

.sidebar {
    min-height: 100vh;
    background-color: #fff;
    box-shadow: 1px 0 0 rgba(0,0,0,.1);
}

.sidebar .nav-link {
    color: #333;
    padding: 0.75rem 1rem;
}

.sidebar .nav-link.active {
    color: var(--primary-color);
    font-weight: 600;
    background-color: #e9ecef;
}

.main-content {
    padding: 2rem;
}

.screening-history-table th {
    font-weight: 600;
    color: #555;
}