/* Custom Styles for ISP Billing System */

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

.card {
    border: none;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.badge {
    padding: 0.5rem 0.75rem;
    font-size: 0.85rem;
    font-weight: 500;
}

.btn {
    border-radius: 6px;
    font-weight: 500;
    padding: 0.5rem 1rem;
}

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
}

table {
    font-size: 0.95rem;
}

table thead {
    background-color: #f8f9fa;
    border-bottom: 2px solid #dee2e6;
}

.sidebar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.nav-link {
    color: rgba(255, 255, 255, 0.8);
    transition: color 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: #ffffff;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

.alert {
    border-radius: 8px;
    border: none;
}

.form-control,
.form-select {
    border-radius: 6px;
    border: 1px solid #dee2e6;
    padding: 0.6rem 0.75rem;
}

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

.invoice-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid #dee2e6;
}

.invoice-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.invoice-items {
    margin-bottom: 2rem;
}

.invoice-summary {
    background-color: #f8f9fa;
    padding: 1rem;
    border-radius: 8px;
}

.invoice-summary-row {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid #dee2e6;
}

.invoice-summary-row:last-child {
    border-bottom: none;
    font-weight: bold;
    font-size: 1.1rem;
}

@media (max-width: 768px) {
    .invoice-details {
        grid-template-columns: 1fr;
    }
    
    .table-responsive {
        font-size: 0.85rem;
    }
}

@media print {
    .no-print {
        display: none;
    }
    
    body {
        background-color: white;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #dee2e6;
    }
}