.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.calc-panel{padding:22px}.calc-header,.calc-actions{display:flex;align-items:center;justify-content:space-between;gap:12px}.calc-caption{color:#65758a;font-size:12px;font-weight:700}.mode-set{display:inline-flex;background:#edf2f9;padding:3px;border-radius:9px}.mode{border:0;background:transparent;color:#748299;border-radius:7px;padding:7px 13px;font-size:12px;font-weight:800}.mode.active{color:#225bba;background:#fff;box-shadow:0 1px 5px #0001}.expression{display:block;width:100%;height:64px;border:1px solid #dce5ef;border-radius:10px;background:#fbfcff;font-size:24px;padding:12px 15px;text-align:right;margin:16px 0 10px;color:#172234;outline:none}.expression:focus{border-color:#3472dd;box-shadow:0 0 0 3px #3472dd1a}.answer{display:flex;flex-direction:column;gap:6px;align-items:flex-end;background:#eff5ff;padding:14px 16px;border-radius:10px;min-height:86px}.answer span{font-size:12px;color:#6483ac}.answer strong{font-size:clamp(22px,4vw,31px);letter-spacing:-.035em;color:#173869;overflow-wrap:anywhere;max-width:100%;text-align:right}.calc-error{min-height:17px}.calc-actions{justify-content:flex-end;margin-bottom:14px}.keypad{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:9px}.keypad button{height:55px;border:1px solid #e0e7f0;border-radius:10px;background:#fff;color:#223247;font-size:18px;font-weight:700;transition:background .12s}.keypad button:hover{background:#eaf2ff}.keypad .fn{font-size:15px;background:#f5f7fb;color:#4c6281}.keypad .op{background:#eaf1fd;color:#2863bf}.keypad .equals{background:#2868df;color:#fff;border-color:#2868df}.keypad .equals:hover{background:#1855c4}.calc-note{font-size:12px;color:#8290a2;text-align:center;margin:15px 0 0}.history-list{display:flex;flex-direction:column;gap:8px}.history-item{display:flex;justify-content:space-between;gap:15px;width:100%;background:#f8faff;border:1px solid #e7edf5;border-radius:9px;padding:12px;text-align:left;font-size:13px;color:#536781}.history-item strong{color:#234a86;font-size:14px}.history-item:hover{background:#ecf3ff}.history-panel .muted{font-size:13px;color:#94a0ad;margin:0}@media(max-width:540px){.calc-panel{padding:15px 13px}.expression{height:57px;font-size:20px}.keypad{gap:7px}.keypad button{height:48px;font-size:17px}.keypad .fn{font-size:13px}.answer strong{font-size:25px}}