.oc-layout{display:grid;grid-template-columns:minmax(260px,440px) minmax(220px,1fr);gap:24px;align-items:start;max-width:1000px}
.oc-machine{padding:18px;border:1px solid var(--line-color);border-radius:12px;background:var(--muted-bg-color-l);min-width:0}
.oc-screen{margin-bottom:12px;padding:12px;border:1px solid var(--line-color);border-radius:8px;background:var(--main-bg-color);text-align:right}
#calculator-expression{min-height:24px;font-size:14px;color:var(--muted-color);overflow-wrap:anywhere}
#calculator-result{display:block;width:100%;font:600 clamp(22px,4vw,34px)/1.5 var(--font);font-variant-numeric:tabular-nums;color:var(--title-color);overflow-wrap:anywhere;cursor:text}
#calculator-error{min-height:42px;margin:6px 0 0;font-size:13px;line-height:1.6;color:var(--title-color);text-align:left}
.oc-keys{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:7px}
.oc-keys button{min-width:0;min-height:48px;border:1px solid var(--line-color);border-radius:8px;background:var(--main-bg-color);color:var(--title-color);font:500 20px/1.3 var(--font);cursor:pointer;touch-action:manipulation}
.oc-keys button.oc-function{font-size:16px;background:var(--muted-bg-color-l)}
.oc-keys button.oc-operator{color:var(--theme-color);font-size:24px}
.oc-keys button.oc-equals{color:#fff;background:#ce2339;border-color:#ce2339}
.oc-keys button:hover{border-color:var(--theme-color)}
.oc-keys button[aria-pressed="true"]{outline:2px solid var(--theme-color);outline-offset:-3px}
#office-calculator :focus-visible{outline:3px solid var(--brand-blue);outline-offset:3px}
.oc-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:12px}
.oc-history{min-width:0}.oc-history-head{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:12px;flex-wrap:wrap}
.oc-history-head h2{font-size:17px;margin:0}.oc-history-head span{font-size:13px;font-weight:400;color:var(--muted-color)}
#calculator-history{max-height:510px;overflow:auto;overscroll-behavior:contain;padding:4px}
.oc-history-item{display:flex;flex-direction:column;gap:5px;align-items:flex-end;width:100%;min-height:56px;padding:10px 12px;margin-bottom:8px;border:1px solid var(--line-color);border-radius:8px;background:var(--main-bg-color);color:var(--main-color);text-align:right;font:inherit;cursor:pointer}
.oc-history-item span,.oc-history-item strong{max-width:100%;overflow-wrap:anywhere;font-variant-numeric:tabular-nums}
.oc-history-item span{font-size:13px}.oc-history-item strong{font-size:20px;color:var(--title-color)}
.oc-help{max-width:1000px;margin-top:20px;line-height:1.8}.oc-help p{margin:8px 0}
@media(max-width:767px){.oc-layout{grid-template-columns:minmax(0,1fr);gap:20px}.oc-machine{max-width:440px;width:100%;padding:12px}.oc-keys{gap:6px}.oc-keys button{min-height:48px}#calculator-history{max-height:290px}}
@media(prefers-reduced-motion:reduce){#office-calculator *{scroll-behavior:auto}}
@media print{.oc-keys,.oc-actions,.oc-history-head button{display:none}.oc-layout{display:block}.oc-history{margin-top:20px}#calculator-history{max-height:none;overflow:visible}}