/* ── GATE GRID ────────────────────────────────────── */
  .gates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 20px;
  }
  .gate-bg-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    transition: border-color .25s, transform .2s;
    position: relative;
  }
  .gate-bg-card:hover {
    border-color: var(--border2);
    transform: translateY(-2px);
  }
  .gate-bg-card::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0; height: 1px;
    background: linear-gradient(90deg, transparent, var(--gcolor, var(--text-primary)), transparent);
    opacity: 0; transition: opacity .3s;
  }
  .gate-bg-card:hover::before { opacity: 1; }

  .gate-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 18px 20px 14px;
    border-bottom: 1px solid var(--border);
  }
  .gate-title-row { display: flex; align-items: center; gap: 12px; }
  .gate-dot {
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--gcolor, var(--text-primary));
    box-shadow: 0 0 8px var(--gcolor, var(--text-primary));
  }
  .gate-name {
    font-size: 16px; font-weight: 700; letter-spacing: .02em;
    color: var(--text-primary);
  }
  .gate-type-badge {
    font-size: 11px; font-weight: 600; letter-spacing: .05em; text-transform: uppercase;
    padding: 3px 10px; border-radius: 20px;
    background: rgba(255,255,255,0.05); color: var(--text-muted);
    border: 1px solid var(--border2);
  }

  .gate-body { display: flex; gap: 0; }


   /* Left: symbol + circuit */
  .gate-visual {
    width: 240px; flex-shrink: 0;
    border-right: 1px solid var(--border);
    display: flex; flex-direction: column;
  }
  .visual-tab-row {
    display: flex; border-bottom: 1px solid var(--border);
  }
  .vtab {
    flex: 1; padding: 8px 0; text-align: center; font-size: 11px; font-weight: 600;
    color: var(--text-muted); cursor: pointer; letter-spacing: .04em;
    border-bottom: 2px solid transparent; transition: color .2s, border-color .2s;
    background: none; border-top: none; border-left: none; border-right: none;
    font-family: var(--font); text-transform: uppercase;
  }
  .vtab.active { color: var(--gcolor, var(--text-primary)); border-bottom-color: var(--gcolor, var(--text-primary)); }
  .gate-svg-area {
    flex: 1; display: flex; align-items: center; justify-content: center;
    padding: 12px 10px; min-height: 200px;
    background: var(--bg-secondary);
  }
  .gate-svg-area svg { width: 100%; max-width: 220px; height: auto; }