/* ── FORMULA SECTION ──────────────────────────────── */
  .formula-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px;
  }
  .formula-bg-card {
    background: var(--bg-card2); border: 1px solid var(--border);
    border-radius: 12px; padding: 16px 20px;
    display: flex; flex-direction: column; gap: 8px;
  }
  .formula-name { font-size: 13px; font-weight: 600; color: var(--text-primary); }
  .formula-expr {
    font-family: var(--mono); font-size: 15px; font-weight: 600;
    color: var(--text-primary);
    background: rgba(79,142,247,0.08); border: 1px solid rgba(79,142,247,0.15);
    padding: 8px 12px; border-radius: 8px; text-align: center;
  }
  .formula-desc { font-size: 12px; color: var(--text-muted); }