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

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

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

.card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    transform: translateY(-2px);
}

.card-header {
    background: linear-gradient(135deg, var(--primary-color), #0056b3);
    color: white;
    border-radius: 10px 10px 0 0 !important;
    border: none;
}

.stats-card {
    text-align: center;
    padding: 1.5rem;
}

.stats-card .stats-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.stats-card .stats-number {
    font-size: 2rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.stats-card .stats-label {
    color: #6c757d;
    font-size: 0.9rem;
}

.table {
    background: white;
    border-radius: 10px;
    overflow: hidden;
}

.table thead th {
    border-top: none;
    background-color: #f8f9fa;
    font-weight: 600;
}

.btn {
    border-radius: 6px;
    font-weight: 500;
}

.btn-sm {
    padding: 0.25rem 0.75rem;
}

.badge {
    font-size: 0.75rem;
    padding: 0.375rem 0.75rem;
}

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-card {
    width: 100%;
    max-width: 400px;
    border: none;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.login-header {
    background: linear-gradient(135deg, var(--primary-color), #0056b3);
    color: white;
    text-align: center;
    padding: 2rem;
    border-radius: 15px 15px 0 0;
}

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

.status-active {
    color: var(--success-color);
}

.status-used {
    color: var(--warning-color);
}

.status-expired {
    color: var(--danger-color);
}

.chart-container {
    position: relative;
    height: 300px;
    margin: 1rem 0;
}

.export-buttons {
    margin-bottom: 1rem;
}

.search-box {
    max-width: 300px;
}

.pagination {
    margin-top: 1rem;
}

.voucher-code {
    font-family: 'Courier New', monospace;
    font-weight: bold;
    background-color: #f8f9fa;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

@media (max-width: 768px) {
    .stats-card {
        margin-bottom: 1rem;
    }
    
    .table-responsive {
        font-size: 0.875rem;
    }
    
    .btn-group {
        display: flex;
        flex-direction: column;
    }
    
    .btn-group .btn {
        margin-bottom: 0.25rem;
    }
}

.loading {
    opacity: 0.6;
    pointer-events: none;
}

.spinner-border-sm {
    width: 1rem;
    height: 1rem;
}