/* Put this in your theme CSS or inside a style tag in WP coder */
.nr-tool { 
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  max-width: 980px; margin: 18px auto; padding: 18px; border-radius: 12px;
  background: linear-gradient(180deg,#ffffff,#fbfbff); box-shadow: 0 6px 22px rgba(10,20,40,0.06);
  border: 1px solid rgba(30,40,60,0.04);
}
.nr-tool h2 { margin: 0 0 12px 0; font-size: 20px; }
.controls { display:flex; gap:12px; align-items:center; flex-wrap:wrap; }
.controls label { min-width:120px; color:#333; font-weight:600; }
#reaction-select { flex:1 1 420px; padding:8px 10px; border-radius:8px; border:1px solid #d0d7e2; font-size:15px; }
.buttons { display:flex; gap:8px; }
.btn { padding:8px 12px; border-radius:8px; border:0; cursor:pointer; background:#1f6feb; color:white; font-weight:600; }
.btn:active { transform:translateY(1px); }
.btn-reset { background:#f44336; }
.mechanism-panel { margin-top:16px; background:#f8fbff; padding:16px; border-radius:10px; min-height:140px; border:1px dashed rgba(31,111,235,0.12); overflow:auto; }
.mech-title { font-size:18px; margin-bottom:8px; font-weight:700; }
.mech-sub { color:#333; margin:6px 0; }
.mech-steps { margin-left:18px; }
.example { margin-top:12px; padding:10px; border-radius:8px; background:linear-gradient(180deg,#fff,#fbfdff); border:1px solid rgba(0,0,0,0.03); }
.scheme { font-family: "Courier New", monospace; background:#f1f5ff; padding:8px; border-radius:6px; display:block; margin:8px 0; white-space:pre-wrap; }
.toggle-step { display:inline-block; margin-top:6px; font-size:13px; color:#1f6feb; cursor:pointer; text-decoration:underline; }
.small { font-size:13px; color:#555; }