:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}.card{padding:2em}#app{max-width:1280px;margin:0 auto;padding:2rem;text-align:center}@media (prefers-color-scheme: light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}body{font-family:Arial,sans-serif;margin:0;padding:0;background-color:#f5f5f5;display:flex;justify-content:center;align-items:center;height:100vh}#app{text-align:center}h1{font-size:2rem;font-weight:700;color:#2f3e46;margin-bottom:20px}.calculator{width:300px;margin:0 auto;padding:20px;border-radius:10px;background:#fff;box-shadow:0 4px 10px #0000001a}.display{width:100%;height:60px;border:none;border-radius:5px;background:#f2f4f5;font-size:2rem;font-weight:700;text-align:right;margin-bottom:20px;padding:10px;box-sizing:border-box}.buttons{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.btn{height:60px;font-size:1.5rem;font-weight:700;border:none;border-radius:10px;background:#f2f4f5;color:#333;cursor:pointer;transition:all .2s ease}.btn:hover{background:#e0e6e9}.btn:active{background:#d1d8dd}