:root{color-scheme:dark;--bg:#0b101b;--panel:#141c2c;--line:#293247;--muted:#929fb8;--text:#f3f6ff;--blue:#4487ff;--red:#ff6965;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-synthesis:none}
*{box-sizing:border-box}body{margin:0;min-width:320px;background:radial-gradient(ellipse at 75% 0%,#182b4b80,transparent 48%),var(--bg);color:var(--text)}button,input{font:inherit}button,a,input,summary{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:wait;opacity:.45}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #87b4ff;outline-offset:4px}button{transition:background .15s,transform .15s}button:active:not(:disabled){transform:translateY(1px)}.page-shell{max-width:1140px;margin:auto;padding:0 44px}.topbar{height:94px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{text-decoration:none;color:var(--text);font-size:29px;font-weight:900;font-style:italic;letter-spacing:-1.5px;display:flex;align-items:center;gap:9px}.brand-mark{color:var(--blue);letter-spacing:-7px;margin-right:8px;font-size:39px}.brand-tag{font-style:normal;letter-spacing:2px;font-size:9px;font-weight:600;margin-left:12px;border-left:1px solid #49546b;padding-left:20px;color:#abb6ca}.header-label{font-size:10px;font-weight:700;letter-spacing:2px;color:#adb8ce;display:flex;align-items:center;gap:9px}.status-dot{height:6px;width:6px;background:var(--blue);border-radius:50%;box-shadow:0 0 12px #4487ff77}.intro{position:relative;padding:44px 0 32px;overflow:hidden}.eyebrow{font-size:10px;font-weight:700;letter-spacing:2px;color:#91b4f2;display:flex;gap:10px;align-items:center}.eyebrow>span{height:2px;width:21px;background:var(--blue)}h1{font-size:clamp(36px,4.5vw,54px);font-style:italic;font-weight:850;letter-spacing:-2px;line-height:1.05;margin:20px 0 15px}h1 span{color:#6b9dff}.intro>p{font-size:14px;color:var(--muted);margin:0}.track-art{position:absolute;right:6%;top:50px;width:245px;height:145px;transform:rotate(-12deg);opacity:.35}.track-art>span{position:absolute;font-size:114px;line-height:1;font-style:italic;font-weight:900;color:#465d81;right:25px;top:16px}.track-line{position:absolute;inset:0;border:18px solid #345180;border-radius:75px 45px;transform:skewX(-22deg);mask-image:linear-gradient(90deg,#000,transparent)}.workspace{display:grid;grid-template-columns:1.12fr 1fr;gap:24px;align-items:start}.panel{border:1px solid var(--line);border-radius:22px;background:linear-gradient(145deg,#1b263a55,transparent 55%),var(--panel);overflow:hidden}.calculator{padding:22px}.panel-heading{display:flex;justify-content:space-between;align-items:center;font-size:10px;font-weight:700;letter-spacing:1.5px;color:#bac6db}.small-slashes{color:var(--blue);font-size:15px;font-style:italic;letter-spacing:-3px;margin-right:10px}.decimal-badge{font-size:8px;color:#8494ae;letter-spacing:1.3px}.display{background:linear-gradient(120deg,#10192b,#101726);border:1px solid #26324b;border-top:2px solid #4979bc;border-radius:12px;padding:18px 20px 12px;margin:20px 0 17px;text-align:right;min-height:160px}.display label{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}.display input{display:block;width:100%;min-width:0;text-align:right;color:#b6c6df;border:0;background:transparent;padding:0 0 10px;font-size:21px;outline:none;border-bottom:1px solid transparent;border-radius:0;font-variant-numeric:tabular-nums}.display input:focus{border-color:#4b79c5}.display input::placeholder{color:#6b7e9e}.result-line{display:flex;align-items:center;gap:14px;min-height:60px}.equals-sign{font-size:20px;color:#456494}output{font-variant-numeric:tabular-nums;display:block;flex:1;min-width:0;font-size:43px;font-weight:650;letter-spacing:-1.5px;overflow-x:auto;white-space:nowrap;padding-bottom:4px}output.long-result{font-size:28px;letter-spacing:-.5px}.display-caption{display:block;margin-top:6px;min-height:10px;font-size:8px;font-weight:600;letter-spacing:1.5px;color:#7287a8}.keypad{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:9px}.key{height:58px;border:1px solid #354058;border-radius:11px;background:linear-gradient(145deg,#263145,#202b3d);color:var(--text);font-size:23px;font-weight:550;box-shadow:0 2px 0 #080e1d50}.key:hover{background:#33425b}.key-function{background:#1c2637;color:#a7b6cf;font-size:20px;border-color:#2d3a51}.key-clear{background:#38262f;border-color:#5d3542;color:#ff9693;font-size:16px;font-weight:700}.key-clear:hover{background:#53323c}.key-operator{background:#223a63;border-color:#2e4b7a;color:#92b9ff;font-size:26px}.key-operator:hover{background:#2e4c7b}.key-equals{grid-column:span 3;display:flex;justify-content:space-between;align-items:center;padding:0 20px;background:linear-gradient(110deg,#3975ee,#4f91ff);border-color:#659eff;box-shadow:0 4px 16px #1b5aca35}.key-equals:hover{background:linear-gradient(110deg,#4d88ff,#67a1ff)}.equals-label{font-size:10px;letter-spacing:1.6px;font-weight:750}.keyboard-hint{font-size:10px;color:#8292ac;text-align:center;margin:19px 0 1px;letter-spacing:.1px}.keyboard-hint>span{margin:0 8px}kbd{font:inherit;color:#b2c0d8}.history{display:flex;flex-direction:column;min-height:657px;max-height:657px}.history-heading{padding:25px 22px 22px;border-bottom:1px solid var(--line);gap:8px}.history-heading h2{margin:0;font-size:10px;letter-spacing:1.6px;font-weight:700}.history-heading h2>span{display:inline-block;margin-left:8px;padding:3px 6px;background:#28354c;border-radius:4px;font-size:9px;letter-spacing:0;color:#a8c5f5}.text-button{border:0;background:none;padding:4px 0;color:#8b9bb6;font-size:11px}.text-button:hover{color:var(--text)}.history-content{flex:1;overflow-y:auto;min-height:350px;padding:10px 14px;scrollbar-width:thin;scrollbar-color:#394965 transparent}.empty-state{height:100%;min-height:470px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:20px}.empty-symbol{display:grid;place-items:center;width:64px;height:64px;border:1px solid #30405a;border-radius:20px;background:#1b2941;color:#628bc9;font-size:28px;transform:rotate(-7deg);margin-bottom:20px}.empty-state h3{font-size:15px;margin:0 0 10px;font-weight:600}.empty-state p{font-size:12px;line-height:1.7;color:var(--muted);max-width:220px;margin:0}.history-item{display:flex;align-items:center;border-bottom:1px solid #29354a;gap:7px;padding:8px 0}.reuse-button{flex:1;min-width:0;border:0;color:var(--text);background:none;text-align:left;padding:8px;border-radius:8px}.reuse-button:hover{background:#20314c}.history-expression{display:block;color:#91a1bd;font-size:12px;overflow-wrap:anywhere;line-height:1.5}.history-result{display:block;font-size:22px;letter-spacing:-.5px;margin:6px 0 8px;overflow-wrap:anywhere}.history-time{font-size:9px;color:#6f83a3}.delete-button{border:0;background:none;color:#7a8ba7;font-size:19px;padding:10px;border-radius:7px}.delete-button:hover{color:#ff9693;background:#422b37}.history-footer{padding:18px 20px;font-size:10px;color:#7c8eaa;border-top:1px solid var(--line)}.lock-icon{margin-right:7px;color:#5e83bc}.loading-text{padding:30px 10px;color:var(--muted);font-size:13px;text-align:center}.message{font-size:13px;line-height:1.5;min-height:24px;margin:14px 0;color:#a8c8ff;overflow-wrap:anywhere}.message.error{color:#ffaaa7;border-left:2px solid #f47770;padding-left:12px}.bottom-note{display:flex;align-items:center;justify-content:center;gap:14px;margin:18px 0 20px}.checkered{height:25px;width:25px;opacity:.4;background:conic-gradient(#acc2e8 25%,transparent 0 50%,#acc2e8 0 75%,transparent 0) 0 0/12px 12px;transform:skewX(-12deg)}.bottom-note p{margin:0;font-size:11px;color:#abb9d0}.bottom-note p>span{display:block;font-size:9px;color:#6f809d;margin-top:5px}.help{max-width:650px;margin:0 auto 36px;font-size:11px;color:#879ab8;line-height:1.8}.help summary{cursor:pointer;text-align:center}.help p{padding:4px 16px}.page-footer{display:flex;justify-content:space-between;gap:16px;border-top:1px solid var(--line);padding:23px 0 28px;color:#647590;font-size:9px;letter-spacing:1px}dialog{background:#192439;color:var(--text);border:1px solid #3c5278;border-radius:18px;padding:26px;width:min(90vw,400px)}dialog::backdrop{background:#050b18bb;backdrop-filter:blur(5px)}dialog h2{font-size:20px;margin-top:0}dialog p{color:#aab9d1;font-size:14px;line-height:1.5}.dialog-actions{display:flex;gap:12px;justify-content:flex-end;margin-top:24px}.dialog-button{border:1px solid #425574;background:#24354f;color:white;padding:12px 18px;border-radius:9px}.danger{background:#923b43;border-color:#b8555e}
@media(min-width:1200px){.workspace{grid-template-columns:490px 1fr}}
@media(max-width:700px){.page-shell{padding:0 18px}.topbar{height:74px}.brand{font-size:25px}.brand-tag{display:none}.header-label{font-size:8px;letter-spacing:1.3px}.intro{padding:29px 0 26px}.eyebrow{font-size:8px;letter-spacing:1.7px}h1{font-size:39px;margin:16px 0 12px;letter-spacing:-1.5px}.intro>p{font-size:12px}.track-art{width:140px;height:90px;right:-30px;top:50px;opacity:.22}.track-art>span{font-size:70px}.track-line{border-width:12px}.workspace{grid-template-columns:1fr;gap:20px}.calculator{padding:18px;border-radius:19px}.display{margin:17px 0 15px;padding:17px 17px 12px}.key{height:57px}.keypad{gap:8px}.keyboard-hint{margin-top:17px}.history{min-height:280px;max-height:460px;border-radius:19px}.history-content{min-height:190px;max-height:330px}.empty-state{min-height:190px;padding:20px}.empty-symbol{height:44px;width:44px;font-size:23px;border-radius:13px;margin-bottom:13px}.history-heading{padding:19px}.history-footer{padding:15px 19px}.bottom-note{margin-top:8px}.page-footer{font-size:8px;letter-spacing:.5px;align-items:center}.page-footer>span:last-child{text-align:right}.help{margin-bottom:25px}output{font-size:40px}}
@media(prefers-reduced-motion:reduce){button{transition:none}}