.button{flex:1;margin:5px;min-height:50px;padding:12px 0;font-size:1.1rem;border:none;border-radius:6px;cursor:pointer;transition:transform .06s ease,box-shadow .08s ease;display:inline-flex;align-items:center;justify-content:center}.button:active{transform:scale(.96)}.button-black{background:linear-gradient(to bottom,#070606,#070606,#463434);color:#f8fc23;box-shadow:0 2px 4px #00000080}.button-red{background:linear-gradient(to bottom,#f02020,#f87676,#f52828,#f70101);color:#fff;box-shadow:0 2px 6px #f000002e}.button-green{background:linear-gradient(to top,#95f584,#b7f7ac,#3af719);color:#0c0b0b;box-shadow:0 2px 6px #00ff000f}.button-memory{flex:none;width:110px;height:34px;margin:2px;padding:6px 0;font-size:.9rem;border:none;border-radius:6px;cursor:pointer;transition:transform .06s ease;background:linear-gradient(to bottom,#222,#444);color:gold;box-shadow:0 0 4px #ffff002e}.button-black:hover{background:linear-gradient(to bottom,#1d1b1b,#383737,#0f0d0d)}.button-red:hover{background:linear-gradient(to bottom,#fa5757,#f89e9e,#fa6363,#f84444)}.button-green:hover{background:linear-gradient(to top,#6dc95c,#37e419,#126e01)}.button-memory:hover{background:linear-gradient(to bottom,#333,#555,#333)}#zero{flex:2}.App{display:flex;justify-content:center;align-items:center;min-height:100vh}.expression-display{background-color:#9e9a8e2d;color:#c300ff;font-size:1.2rem;text-align:right;padding:5px 10px;border-radius:6px;opacity:.8;margin-bottom:5px;min-height:30px}.calculator{background:linear-gradient(to top,#070606,#0e0101,#1d1616,#4d4444,#0e0101,#0e0101);border-radius:10px;border:2px solid rgb(10,10,8);width:400px;min-height:520px;max-height:none;padding:15px;box-shadow:0 5px 15px #0000004d;display:flex;flex-direction:column;justify-content:flex-start;margin-bottom:50px;overflow:hidden}.background-wrapper{display:flex;justify-content:center;align-items:center}.button-panel{border:2px solid rgba(224,7,126,.568);border-radius:8px;padding:3px;max-height:500px;background-color:#1b1515;box-shadow:inset 0 0 10px #f003}.keyboard-hint{position:fixed;bottom:40px;right:15px;font-size:.85rem;color:#aef8e6;background:#00000080;padding:6px 5px;border-radius:8px;font-style:italic;opacity:0;animation:fadeInHint 2s ease forwards;animation-delay:2s;-webkit-user-select:none;user-select:none;pointer-events:none;box-shadow:0 0 6px #8aff8a66}@keyframes fadeInHint{0%{opacity:0;transform:translateY(8px)}to{opacity:.9;transform:translateY(0)}}body{text-align:center;font-family:Arial,sans-serif;background-color:#515e5e;color:#dad720;margin:0;padding:0;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;display:flex;justify-content:center;align-items:center;min-height:100vh}*{box-sizing:border-box}