.calc-wrap{display:grid;gap:14px}
@media (min-width:760px){.calc-wrap{grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);align-items:stretch}.calc-kbd{margin-top:auto!important;padding-top:14px}}
.calc-card{padding:16px}
.calc-display{background:var(--surface-2);border-radius:var(--radius);padding:12px 16px 14px;margin-bottom:14px;text-align:right;min-width:0}
.calc-top{display:flex;align-items:center;gap:8px;min-height:34px}
.calc-expr{flex:1;min-width:0;color:var(--muted);font-size:16px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;direction:rtl;text-align:right;font-variant-numeric:tabular-nums}
.calc-main{display:block;font-size:48px;font-weight:700;line-height:1.2;letter-spacing:-.02em;font-variant-numeric:tabular-nums;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-height:58px;margin-top:4px}
.calc-main.err{color:var(--bad);font-size:22px;white-space:normal;padding-top:16px}
.calc-keys{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}
.calc-keys button{height:clamp(58px,15vw,68px);border:0;border-radius:16px;background:var(--surface-2);color:var(--text);font-size:26px;font-weight:600;cursor:pointer;transition:filter .1s,transform .05s;touch-action:manipulation;-webkit-tap-highlight-color:transparent;font-variant-numeric:tabular-nums}
.calc-keys button:hover{filter:brightness(.96)}
.calc-keys button:active,.calc-keys button.press{transform:scale(.96);filter:brightness(.9)}
.calc-keys .k-fn{color:var(--muted);font-size:22px}
.calc-keys .k-op{background:var(--brand-soft);color:var(--brand);font-size:30px}
.calc-keys .k-op.on{background:var(--brand);color:var(--brand-text)}
.calc-keys .k-eq{background:var(--brand);color:var(--brand-text);font-size:30px}
.calc-hist{display:flex;flex-direction:column;min-width:0}
.calc-hist-head{display:flex;align-items:center;justify-content:space-between;gap:8px}
.calc-list{list-style:none;margin:10px 0 0;padding:0;max-height:420px;overflow:auto}
.calc-list li+li{border-top:1px solid var(--border)}
.calc-list button{display:block;width:100%;text-align:right;background:none;border:0;padding:10px 6px;cursor:pointer;border-radius:8px;font-variant-numeric:tabular-nums}
.calc-list button:hover{background:var(--surface-2)}
.calc-list small{display:block;color:var(--muted);font-size:13px;overflow-wrap:anywhere}
.calc-list b{font-size:19px;overflow-wrap:anywhere}
.calc-empty{margin:12px 0 0}
.calc-kbd{margin:14px 0 0}
.calc-kbd kbd{font-family:var(--mono);font-size:12px;background:var(--surface-2);border:1px solid var(--border);border-radius:5px;padding:0 5px}
@media (max-width:759px){.calc-kbd{display:none}}