:root {
  --bg1:#050816;
  --bg2:#0b1020;
  --bg3:#151a2c;
  --border:#1f2937;
  --text1:#f9fafb;
  --text2:#e5e7eb;
  --text3:#9ca3af;
  --text4:#6b7280;
  --accent:#6366f1;
  --green:#22c55e;
  --blue:#3b82f6;
  --font:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}

body {
  margin:0;
  font-family:var(--font);
  background:radial-gradient(circle at top,#111827 0,#020617 55%);
  color:var(--text1);
}

.app-shell {
  display:flex;
  height:100vh;
}

/* Ajoute ici tes classes existantes : .sidebar, .mail-list, .mail-item, .email-header, .crm-card, .toast, etc. */