*,*:before,*:after{box-sizing:border-box}body{margin:0;padding:0;min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#1a0a00,#2d1810,#441f15,#ff6b35,#ff8c42);background-size:400% 400%;animation:gradientFlow 15s ease infinite;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;position:relative;overflow:hidden;cursor:none}@keyframes gradientFlow{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}#cursor-glow{position:fixed;width:300px;height:300px;border-radius:50%;background:radial-gradient(circle,rgba(255,107,53,.4) 0%,rgba(255,140,66,.2) 30%,transparent 70%);pointer-events:none;transform:translate(-50%,-50%);transition:transform .15s ease-out;z-index:1;mix-blend-mode:screen}#cursor-dot{position:fixed;width:12px;height:12px;border-radius:50%;background:#ff6b35;pointer-events:none;transform:translate(-50%,-50%);transition:transform .05s ease-out,width .2s,height .2s;z-index:1000;box-shadow:0 0 20px #ff6b35cc}#cursor-dot.clicking{width:20px;height:20px;background:#ff8c42}.calculator-grid{display:grid;margin-top:2rem;justify-content:center;grid-template-columns:repeat(4,6.5rem);grid-template-rows:minmax(8rem,auto) repeat(5,6.5rem);gap:.75rem;padding:1.5rem;background:#140a0580;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-radius:24px;box-shadow:0 8px 32px #00000080,0 0 60px #ff6b3533,inset 0 1px 1px #ff8c421a;border:1px solid rgba(255,140,66,.2);position:relative;z-index:10;animation:floatIn .8s ease-out}@keyframes floatIn{0%{opacity:0;transform:translateY(30px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}.calculator-grid>button{cursor:none;font-size:2rem;border-radius:12px;border:1px solid rgba(255,140,66,.3);outline:none;background:linear-gradient(145deg,#ff6b3526,#ff8c421a);color:#fff;font-weight:600;transition:all .3s cubic-bezier(.4,0,.2,1);box-shadow:0 4px 15px #0000004d,inset 0 1px 1px #ff8c4233;position:relative;overflow:hidden}.calculator-grid>button:before{content:"";position:absolute;top:0;left:0;width:100%;height:100%;background:linear-gradient(135deg,transparent,rgba(255,140,66,.3),transparent);transform:translate(-100%);transition:transform .6s}.calculator-grid>button:hover:before{transform:translate(100%)}.calculator-grid>button:hover,.calculator-grid>button:focus{background:linear-gradient(145deg,#ff6b3559,#ff8c4240);transform:translateY(-2px) scale(1.02);box-shadow:0 8px 25px #ff6b3566,inset 0 1px 2px #ff8c424d;border-color:#ff8c4280}.calculator-grid>button:active{transform:translateY(0) scale(.98);box-shadow:0 2px 10px #ff6b354d,inset 0 1px 2px #0000004d}.span-two{grid-column:span 2;background:linear-gradient(145deg,#ff6b3540,#ff8c4226);font-weight:700}.span-two:hover{background:linear-gradient(145deg,#ff6b3573,#ff8c4259)}.output{grid-column:1 / -1;background:linear-gradient(135deg,#000000b3,#140a05cc);display:flex;flex-direction:column;align-items:flex-end;justify-content:space-around;padding:1.5rem;word-wrap:break-word;word-break:break-all;border-radius:16px;box-shadow:inset 0 2px 10px #00000080,0 2px 20px #ff6b3526;border:1px solid rgba(255,107,53,.3);position:relative;overflow:hidden}.output:before{content:"";position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,rgba(255,140,66,.5),transparent)}.output .previous-operand{color:#ff8c42d9;font-size:1.5rem;font-weight:500;text-shadow:0 2px 10px rgba(255,107,53,.3);animation:fadeIn .3s ease}.output .current-operand{color:#fff;font-size:2.8rem;font-weight:700;text-shadow:0 2px 20px rgba(255,107,53,.6);animation:slideIn .3s ease;letter-spacing:.5px}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideIn{0%{opacity:0;transform:translate(20px)}to{opacity:1;transform:translate(0)}}@media (max-width: 768px){.calculator-grid{grid-template-columns:repeat(4,5rem);grid-template-rows:minmax(6rem,auto) repeat(5,5rem);gap:.5rem;padding:1rem}.calculator-grid>button{font-size:1.5rem}.output .current-operand{font-size:2.2rem}.output .previous-operand{font-size:1.2rem}}