:root {
    --primary: #1E3A8A;
    --success: #10B981;
    --danger: #EF4444;
}

body {
    font-family: 'Inter', system-ui, sans-serif;
    background: #f8fafc;
}

.sidebar {
    width: 260px;
    height: 100vh;
    position: fixed;
    background: white;
    box-shadow: 4px 0 20px rgba(0,0,0,0.1);
    z-index: 1000;
    overflow-y: auto;
}

.main-content {
    margin-left: 260px;
    padding: 30px 25px;
    min-height: 100vh;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    color: #475569;
    text-decoration: none;
    border-radius: 12px;
    margin: 4px 10px;
    font-weight: 500;
    transition: all 0.2s;
}

.nav-link:hover, .nav-link.active {
    background-color: #f1f5f9;
    color: var(--primary);
}

.card {
    border: none;
    border-radius: 16px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
}

.btn-primary {
    background-color: var(--primary);
    border: none;
    border-radius: 10px;
}

.income-text { color: var(--success); font-weight: 600; }
.expense-text { color: var(--danger); font-weight: 600; }
.balance-text { color: var(--primary); font-weight: 700; }

.transaction-item {
    border-left: 5px solid;
}

.bg-gradient {
    background: linear-gradient(135deg, #1E3A8A 0%, #3B82F6 100%);
}

@media (max-width: 992px) {
    .sidebar { transform: translateX(-100%); transition: 0.3s ease; }
    .main-content { margin-left: 0; padding: 15px; }
}