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

/* General styling */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

/* Navigation */
.navbar {
    box-shadow: 0 2px 4px rgba(0,0,0,.1);
}

/* Cards */
.card {
    border: none;
    box-shadow: 0 0.125rem 0.25rem rgba(0,0,0,.075);
    margin-bottom: 1.5rem;
}

.card-header {
    background-color: var(--light-color);
    border-bottom: 1px solid rgba(0,0,0,.125);
    font-weight: 600;
}

/* Tables */
.table {
    margin-bottom: 0;
}

.table-hover tbody tr:hover {
    background-color: rgba(0,0,0,.02);
}

/* Buttons */
.btn {
    border-radius: 0.25rem;
    font-weight: 500;
}

.btn-group .btn {
    border-radius: 0;
}

.btn-group .btn:first-child {
    border-top-left-radius: 0.25rem;
    border-bottom-left-radius: 0.25rem;
}

.btn-group .btn:last-child {
    border-top-right-radius: 0.25rem;
    border-bottom-right-radius: 0.25rem;
}

/* Forms */
.form-label {
    font-weight: 500;
    margin-bottom: 0.5rem;
}

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

/* Validation */
.field-validation-error {
    color: var(--danger-color);
    font-size: 0.875rem;
}

.input-validation-error {
    border-color: var(--danger-color);
}

.validation-summary-errors {
    color: var(--danger-color);
}

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

/* Alerts */
.alert {
    border-radius: 0.375rem;
}

/* Footer */
footer {
    background-color: var(--light-color);
    padding: 2rem 0;
    margin-top: 3rem;
    border-top: 1px solid rgba(0,0,0,.1);
}

/* Utility classes */
.bg-light {
    background-color: var(--light-color) !important;
}

.text-muted {
    color: var(--secondary-color) !important;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .table-responsive {
        border: none;
    }
    
    .btn-group {
        display: flex;
        flex-wrap: wrap;
    }
    
    .btn-group .btn {
        flex: 1 1 auto;
        min-width: 0;
    }
}