.ou-calculator-page{padding:20px 0 44px}.ou-calculator{margin-top:14px;display:grid;gap:14px}@media(min-width:980px){.ou-calculator{grid-template-columns:minmax(0,760px) minmax(260px,1fr);align-items:start}}.ou-calculator__app,.ou-calculator__history{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px}.ou-calculator__toolbar{display:flex;justify-content:flex-end;margin-bottom:10px}.ou-calculator__history-toggle{appearance:none;border:1px solid var(--border);border-radius:10px;background:var(--surface-2);color:var(--text);font-size:.95rem;font-weight:650;padding:8px 10px;cursor:pointer}.ou-calculator__history-toggle:hover{border-color:#2563eb59}.ou-calculator__history-toggle:focus-visible{outline:3px solid rgba(37,99,235,.24);outline-offset:2px}.ou-calculator__lead{margin:0 0 12px;color:var(--muted);font-size:1rem;line-height:1.45}.ou-calculator__lead code{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,Courier New,monospace;font-size:.9em;padding:1px 6px;border-radius:8px;background:#2563eb14}.ou-calculator__screen{min-height:112px;border:1px solid var(--border);border-radius:14px;background:linear-gradient(180deg,#fff,#f5f8ff);padding:12px 14px;display:flex;flex-direction:column;justify-content:flex-end;gap:8px}.ou-calculator__expression{min-height:1.5em;color:var(--muted);text-align:right;font-size:1rem;line-height:1.35;word-break:break-all;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,Courier New,monospace}.ou-calculator__result{min-height:1.2em;text-align:right;font-size:clamp(1.85rem,4vw,2.5rem);line-height:1.15;font-weight:800;word-break:break-all}.ou-calculator__result.is-error{color:#b42318}.ou-calculator__result.is-flash-error{animation:ou-calculator-invalid-flash 1s ease-out}@keyframes ou-calculator-invalid-flash{0%{color:inherit;text-shadow:none}35%{color:#b42318;text-shadow:0 0 10px rgba(180,35,24,.35)}to{color:inherit;text-shadow:none}}.ou-calculator__keys{margin-top:12px;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}.ou-calculator__key{appearance:none;height:56px;border:1px solid var(--border);border-radius:14px;background:#fff;color:var(--text);font-size:1.3rem;font-weight:700;cursor:pointer;transition:transform .08s ease,filter .18s ease,border-color .18s ease;user-select:none}.ou-calculator__key:hover{border-color:#2563eb5c;filter:brightness(1.01)}.ou-calculator__key:active{transform:translateY(1px)}.ou-calculator__key:focus-visible{outline:3px solid rgba(37,99,235,.24);outline-offset:2px}.ou-calculator__key--muted{background:var(--surface-2);font-size:1.05rem}.ou-calculator__key--operator{background:#2563eb1a;border-color:#2563eb47}.ou-calculator__key--accent{border-color:#2563eb4d;background:linear-gradient(180deg,var(--brand),var(--brand-2));color:#fff}.ou-calculator__key--wide{grid-column:span 3}.ou-calculator__history{display:flex;flex-direction:column;min-height:280px}.ou-calculator__history-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px}.ou-calculator__history-title{margin:0;line-height:1.2;font-size:1.2rem}.ou-calculator__history-clear{appearance:none;border:1px solid var(--border);border-radius:10px;background:var(--surface-2);color:var(--text);font-size:.95rem;font-weight:650;padding:8px 10px;cursor:pointer}.ou-calculator__history-clear:hover{border-color:#2563eb59}.ou-calculator__history-clear:focus-visible{outline:3px solid rgba(37,99,235,.24);outline-offset:2px}.ou-calculator__history-list{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:8px;max-height:460px;overflow:auto}.ou-calculator__history-empty{margin:0;border:1px dashed var(--border);border-radius:12px;background:var(--surface-2);color:var(--muted);padding:12px;font-size:.98rem}.ou-calculator__history-item{margin:0}.ou-calculator__history-button{width:100%;text-align:left;border:1px solid var(--border);border-radius:12px;background:var(--surface-2);color:var(--text);padding:10px 12px;cursor:pointer;transition:border-color .18s ease,background-color .18s ease}.ou-calculator__history-button:hover{border-color:#2563eb59;background:#fff}.ou-calculator__history-button:focus-visible{outline:3px solid rgba(37,99,235,.24);outline-offset:2px}.ou-calculator__history-expression{display:block;color:var(--muted);font-size:.95rem;line-height:1.3;word-break:break-all;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,Courier New,monospace}.ou-calculator__history-result{display:block;margin-top:2px;color:var(--brand-2);font-size:1.04rem;font-weight:800;line-height:1.3;word-break:break-all}.ou-calculator.is-history-hidden{grid-template-columns:minmax(0,1fr)}.ou-calculator.is-history-hidden .ou-calculator__history{display:none}.ou-calculator.is-history-hidden .ou-calculator__app{width:min(100%,760px);margin-left:auto;margin-right:auto}@media(max-width:600px){.ou-calculator-page{padding-top:16px}.ou-calculator__app,.ou-calculator__history{padding:12px}.ou-calculator__lead{font-size:.96rem}.ou-calculator__toolbar{margin-bottom:8px}.ou-calculator__history-toggle{font-size:.9rem;padding:7px 9px}.ou-calculator__key{height:50px;border-radius:12px;font-size:1.16rem}.ou-calculator__key--muted{font-size:.96rem}.ou-calculator__history{min-height:0}}