body {
    background: #f4f5f7;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
.sidebar {
    width: 230px;
    min-height: 100vh;
    background: #ffffff;
    border-right: 1px solid #e5e7eb;
    position: sticky;
    top: 0;
}
.sidebar-brand {
    font-weight: 600;
    font-size: 1.1rem;
    color: #2563eb;
}
.sidebar .nav-link {
    color: #374151;
    border-radius: 8px;
    margin-bottom: 2px;
    font-size: 0.9rem;
}
.sidebar .nav-link.active {
    background: #2563eb;
    color: #fff;
}
.sidebar .nav-link:hover:not(.active) {
    background: #f1f5f9;
}
.main-content {
    max-width: 1200px;
}
.card {
    border: 1px solid #e5e7eb;
    border-radius: 12px;
}
.badge-status-active { background: #dcfce7; color: #15803d; }
.badge-status-isolated { background: #fee2e2; color: #b91c1c; }
.badge-status-inactive { background: #f1f5f9; color: #64748b; }
.badge-inv-paid { background: #dcfce7; color: #15803d; }
.badge-inv-overdue { background: #fee2e2; color: #b91c1c; }
.badge-inv-unpaid { background: #fef3c7; color: #92400e; }
.badge-inv-canceled { background: #f1f5f9; color: #64748b; }
table.table td, table.table th { vertical-align: middle; font-size: 0.9rem; }
.stat-card { padding: 1.25rem; }
.stat-card .value { font-size: 1.5rem; font-weight: 600; }
.stat-card .label { font-size: 0.8rem; color: #6b7280; }