/* Right: controls + truth table */
  .gate-right { flex: 1; display: flex; flex-direction: column; }

  .io-panel {
    padding: 16px 18px;
    border-bottom: 1px solid var(--border);
    display: flex; flex-direction: column; gap: 10px;
  }
  .io-label { font-size: 11px; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: .06em; margin-bottom: 4px; }
  .io-controls { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
  .io-btn {
    display: flex; align-items: center; gap: 8px;
    background: var(--bg3); border: 1px solid var(--border2);
    border-radius: 8px; padding: 8px 14px; cursor: pointer;
    font-family: var(--font); transition: all .15s;
    color: var(--text-muted); font-size: 13px; font-weight: 500;
  }
  .io-btn:hover { border-color: var(--blue-dim); color: var(--text-primary); }
  .io-btn .bit-indicator {
    width: 22px; height: 22px; border-radius: 5px;
    display: flex; align-items: center; justify-content: center;
    font-size: 13px; font-weight: 700; font-family: var(--mono);
    background: var(--bg-secondary); border: 1px solid var(--border2);
    transition: all .15s;
  }
  .io-btn.on { border-color: rgba(79,142,247,0.4); color: var(--text-primary); }
  .io-btn.on .bit-indicator {
    background: var(--gcolor, var(--text-primary));
    border-color: var(--gcolor, var(--text-primary));
    color: #fff;
    box-shadow: 0 0 8px var(--gcolor, var(--text-primary));
  }
  .arrow-sep { color: var(--blue-dim); font-size: 18px; }
  .output-display {
    display: flex; align-items: center; gap: 8px;
    padding: 8px 14px; border-radius: 8px;
    background: var(--bg3); border: 1px solid var(--border2);
  }
  .output-label { font-size: 12px; color: var(--text-muted); font-weight: 500; }
  .output-val {
    width: 28px; height: 28px; border-radius: 6px;
    display: flex; align-items: center; justify-content: center;
    font-size: 14px; font-weight: 700; font-family: var(--mono);
    background: var(--bg-secondary); border: 1px solid var(--border2);
    color: var(--text-muted); transition: all .2s;
  }
  .output-val.on {
    background: var(--green); border-color: var(--green); color: #fff;
    box-shadow: 0 0 12px rgba(34,211,110,0.4);
  }
  .output-dot {
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--blue-dim); transition: all .2s;
  }
  .output-dot.on { background: var(--green); box-shadow: 0 0 8px var(--green); }