:root{
  --bg:#ffffff; --text:#111827; --card:#ffffff; --muted:#6b7280;
}
body{background:var(--bg);color:var(--text);font-family:Inter, system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial;}
.card{background:var(--card);border-radius:12px;box-shadow:0 6px 18px rgba(0,0,0,0.06);}
.sidebar{width:240px;min-height:100vh;position:fixed;}
#mainContent{margin-left:260px;}
.sidebar .nav-link{color:rgba(255,255,255,0.85);padding:10px 8px;}
.sidebar .nav-link:hover{color:#fff;background:rgba(255,255,255,0.03);border-radius:8px;}
/* Dark mode */
body.dark-mode{ --bg:#0f1724; --text:#e6eef8; --card:#111827; --muted:#9aa6c0; }
body.dark-mode .sidebar{background:#0b1220;}
/* Table hover */
table.dataTable tbody tr:hover{background:rgba(13,110,253,0.06);}
/* Responsive */
@media (max-width:991px){ .sidebar{position:relative;width:100%;} #mainContent{margin-left:0;} }