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18px;text-align:center;color:var(--muted);font-size:13.5px}.ref-empty p{margin:0}.ref-empty-list{display:flex;flex-direction:column;gap:6px;width:100%}.ref-empty-list .btn{display:flex;align-items:center;gap:8px;width:100%;text-align:left}.ref-empty-list .btn span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.formula-card{position:absolute;top:62px;left:50%;translate:-50% 0;z-index:30;max-width:calc(100% - 24px);background:var(--surface);border:1px solid var(--border);border-radius:16px;box-shadow:0 18px 50px #00000040,0 2px 6px #00000014;overflow:hidden;animation:formula-in .22s cubic-bezier(.2,.9,.3,1.2)}@keyframes formula-in{0%{opacity:0;scale:.92;translate:-50% -10px}}.formula-card-head{display:flex;align-items:center;gap:8px;padding:6px 6px 6px 14px;font-size:13px;font-weight:600;color:var(--accent);border-bottom:1px solid var(--border)}.formula-card.collapsed .formula-card-head{border-bottom:none}.formula-card-head 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