.power-sum-block{gap:.85rem;min-width:0;display:grid}.power-sum-block p{margin:.25rem 0}.power-sum-power{white-space:nowrap;line-height:1.7;display:inline-block}.power-sum-power sup{margin-left:.08em;font-size:.75em}.power-sum-identity{font-size:clamp(1.1rem,3.6vw,1.5rem);font-weight:700}.power-sum-copies{flex-wrap:wrap;gap:.5rem;padding-bottom:14px;display:flex}.power-sum-copies>div{border:1.5px solid var(--line-strong);background:var(--surface-soft);gap:.25rem;min-width:4rem;padding:.6rem;display:grid}.power-sum-copies [data-taken=yes]{border-style:dashed;text-decoration:line-through}.power-sum-copies span:not(.power-sum-power){font-size:var(--text-support)}.power-sum-expression{flex-wrap:wrap;align-items:baseline;gap:.15em .3em;display:inline-flex}.power-chain{--chain-source:4.5rem;--chain-equal:1.5rem;--chain-row-height:5.25rem;--chain-grid:var(--chain-source) var(--chain-equal) minmax(0,1fr);width:100%;max-width:42rem;margin-inline:auto}.power-chain-source{border:1px solid var(--line-strong);border-radius:var(--radius-small);background:var(--surface-soft);padding:.7rem .85rem}.power-chain-source small,.power-chain-rule small{font-size:var(--text-support);font-weight:400;display:block}.power-chain-source p{font-size:clamp(1.15rem,4vw,1.6rem);font-weight:700}.power-chain-rule{border-left:3px solid var(--emphasis);padding:.45rem .5rem;font-size:clamp(1.05rem,3.6vw,1.35rem);font-weight:700}.power-chain-heading{grid-template-columns:calc(var(--chain-source) + var(--chain-equal)) minmax(0,1fr);font-size:var(--text-support);border-bottom:1px solid var(--line-strong);padding-bottom:.35rem;font-weight:700;display:grid}.power-chain-table{isolation:isolate;position:relative}.power-chain-row{grid-template-columns:var(--chain-grid);height:var(--chain-row-height);align-items:center;display:grid}.power-chain-original{border-right:1px solid var(--line-strong);align-content:center;justify-items:center;height:100%;font-size:1.35rem;display:grid}.power-chain-original small{font-size:var(--text-support);line-height:1.3}.power-chain-equal{text-align:center;font-size:1.3rem}.power-chain-replacement{min-width:0;position:relative}.power-chain-reveal{align-items:center;width:100%;display:flex}.power-chain-difference{text-align:center;flex:1;grid-template-columns:.5em minmax(0,1fr) minmax(0,1fr) .5em;align-items:center;min-width:0;font-size:clamp(1.2rem,4.7vw,1.65rem);font-weight:700;display:grid}.power-chain-sign{margin-right:.2em}.power-chain-divisor{flex:0 0 var(--chain-divisor);text-align:right;font-size:1.15rem;font-weight:700}.power-chain-term{border:2px solid #0000;border-radius:.3rem;justify-content:center;justify-self:center;align-items:baseline;min-width:0;padding-inline:.15em;display:inline-flex;position:relative}.power-chain-term[data-term-state=active]{border-color:var(--emphasis);background:var(--surface-soft)}.power-chain-term[data-term-state=canceled]{border:2px dashed var(--line-strong)}.power-chain-term[data-term-state=remaining]{border-color:var(--ink);box-shadow:0 0 0 1px var(--ink);background:var(--surface-soft)}.power-chain-strike{background:var(--ink);transform-origin:0;pointer-events:none;height:2px;position:absolute;top:55%;left:0;right:0}.power-chain-waiting{font-size:var(--text-support);color:var(--muted);position:absolute;top:50%;transform:translateY(-50%)}.power-chain-row:not([data-row-progress="0"]):not([data-row-progress="1"]) .power-chain-original{background:var(--surface-soft);border-left:3px solid var(--emphasis)}.power-chain-links{top:0;bottom:0;left:calc(var(--chain-source) + var(--chain-equal));right:var(--chain-divisor);z-index:1;pointer-events:none;position:absolute}.power-chain-links svg{width:100%;height:100%;display:block;overflow:visible}.power-chain-links path[data-pair-link]{fill:none;stroke:var(--emphasis);stroke-width:1.8px;vector-effect:non-scaling-stroke}.power-chain-links path[data-link-complete=yes]{stroke:var(--line-strong)}.power-chain-links marker path{fill:var(--emphasis)}.power-chain-omission{height:var(--chain-row-height);font-size:var(--text-support);border-block:1px dashed var(--line-strong);place-items:center;display:grid}.power-chain-count{font-size:var(--text-support)}.power-sum-final{font-size:clamp(1.2rem,4vw,1.65rem);font-weight:700}.power-sum-pair,.power-sum-result{border:1px solid var(--line-strong);background:var(--surface-soft);border-radius:var(--radius-small);gap:.5rem;min-width:0;padding:.7rem;display:grid}.power-sum-patterns{grid-template-columns:repeat(2,minmax(0,1fr));gap:.5rem;display:grid}.power-sum-patterns button{border:1px solid var(--line-strong);background:var(--surface);min-height:48px;color:var(--ink);font:inherit;cursor:pointer;border-radius:var(--radius-small);padding:.6rem}.power-sum-patterns [aria-pressed=true]{outline:2px solid var(--emphasis);outline-offset:-2px}.power-sum-block>.power-sum-answer{width:auto;margin:0}.power-sum-answer>.power-sum-block{padding:.7rem}.power-sum-static{margin-block:1rem}@media (width<=500px){.power-chain{--chain-source:3.25rem;--chain-equal:1.15rem}.power-chain-original{font-size:1.2rem}.power-chain-source{padding:.5rem}.power-chain-rule{font-size:1.05rem}.power-chain-heading{font-size:.85rem}}