:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    --dark-bg: #1f2937;
    --light-bg: #f9fafb;
    --border-color: #e5e7eb;
}

body {
    background-color: var(--light-bg);
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #1f2937;
}

.navbar {
    background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: -0.5px;
}

.card {
    border: none;
    border-radius: 16px;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.card-header {
    background: linear-gradient(135deg, #f9fafb 0%, #ffffff 100%);
    border-bottom: 2px solid var(--border-color);
    font-weight: 600;
    padding: 1.25rem 1.5rem;
}

.stat-card {
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transform: translate(30%, -30%);
}

.stat-icon {
    font-size: 2.5rem;
    opacity: 0.2;
    position: absolute;
    right: 1.5rem;
    bottom: 1rem;
}

.balance-card {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
}

.debts-card {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: white;
}

.receivables-card {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    color: white;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    border: none;
    border-radius: 10px;
    padding: 0.625rem 1.25rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(37, 99, 235, 0.3);
}

.btn-sm {
    border-radius: 8px;
    padding: 0.375rem 0.875rem;
}

.table {
    background: white;
    border-radius: 12px;
    overflow: hidden;
}

.table thead th {
    background: linear-gradient(135deg, #f9fafb 0%, #f3f4f6 100%);
    border-bottom: 2px solid var(--border-color);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
    color: #6b7280;
    padding: 1rem;
}

.table tbody tr {
    transition: all 0.2s ease;
}

.table tbody tr:hover {
    background-color: #f9fafb;
    transform: scale(1.01);
}

.badge {
    padding: 0.375rem 0.75rem;
    border-radius: 6px;
    font-weight: 500;
    font-size: 0.75rem;
}

.modal-content {
    border: none;
    border-radius: 16px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.modal-header {
    background: linear-gradient(135deg, #f9fafb 0%, #ffffff 100%);
    border-bottom: 2px solid var(--border-color);
    border-radius: 16px 16px 0 0;
}

.form-control, .form-select {
    border-radius: 10px;
    border: 1.5px solid var(--border-color);
    padding: 0.625rem 0.875rem;
    transition: all 0.3s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-label {
    font-weight: 500;
    color: #374151;
    margin-bottom: 0.5rem;
}

.breadcrumb {
    background: white;
    border-radius: 10px;
    padding: 0.875rem 1.25rem;
    margin-bottom: 1.5rem;
}

.progress {
    height: 12px;
    border-radius: 10px;
    background-color: #e5e7eb;
}

.progress-bar {
    border-radius: 10px;
}

.chart-container {
    position: relative;
    height: 300px;
    padding: 1.5rem;
}

@media (max-width: 768px) {
    .card {
        margin-bottom: 1rem;
    }
    
    .stat-card h2 {
        font-size: 1.5rem;
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.5s ease-out;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}