/* Controls help panel (controls_help.js). Right edge, vertically centred: no other panel is there at load. */
.ch-gone { display: none !important; }
#controls-help { position: fixed; right: 12px; top: 50%; transform: translateY(-50%); z-index: 4; width: 250px;
  max-height: calc(100vh - 140px); overflow-y: auto; padding: 12px 16px 10px; color: #ececec;
  background: rgba(14, 14, 16, 0.92); border: 1px solid rgba(255, 255, 255, 0.10); border-radius: 18px;
  box-shadow: 0 10px 32px rgba(0, 0, 0, 0.45); font: 14px/1.2 system-ui, -apple-system, "Segoe UI", sans-serif; }
#controls-help .ch-head { display: flex; align-items: center; gap: 10px; font-size: 16px; padding: 2px 0; }
#controls-help .ch-head b { flex: 1; font-weight: 700; }
#controls-help .ch-icon { flex: none; }
#controls-help .ch-close { width: 26px; height: 26px; padding: 0; border: 0; border-radius: 6px; background: none;
  color: #bdbdbd; font-size: 16px; line-height: 1; display: inline-flex; align-items: center; justify-content: center; }
#controls-help .ch-close:hover { background: rgba(255, 255, 255, 0.10); color: #fff; }
#controls-help .ch-sep { height: 1px; background: rgba(255, 255, 255, 0.12); margin: 8px 0 6px; }
#controls-help .ch-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 29px; }
#controls-help .ch-glyph { display: inline-flex; align-items: center; gap: 4px; color: #d6d6d6; flex: none; }
#controls-help .ch-key { display: inline-flex; align-items: center; justify-content: center; min-width: 24px; height: 24px;
  padding: 0 6px; border: 1px solid rgba(255, 255, 255, 0.28); border-radius: 6px; background: rgba(255, 255, 255, 0.07);
  font: 600 12px/1 system-ui, -apple-system, "Segoe UI", sans-serif; color: #f2f2f2; }
#controls-help .ch-x2 { font-size: 11px; color: #c4c4c4; }