body{display:flex;justify-content:center;align-items:center;min-height:100vh;font-family:Poppins,sans-serif;background:linear-gradient(135deg,#667eea,#764ba2);margin:0;padding:10px;box-sizing:border-box;overflow-x:hidden}*{box-sizing:inherit}.calculator{background:linear-gradient(145deg,#f6d365,#fda085);padding:5vw;border-radius:20px;box-shadow:0 15px 30px #0000004d;width:100%;max-width:400px}h1{text-align:center;color:#fff;margin-bottom:1em;font-size:clamp(1.4rem,5vw,2rem);text-shadow:1px 1px 4px rgba(0,0,0,.3)}.display{background:#ffffff40;color:#fff;font-size:clamp(1.2rem,6vw,2rem);padding:.8em;border-radius:15px;margin-bottom:1em;text-align:right;box-shadow:inset 0 4px 8px #0003;word-wrap:break-word;min-height:2.5em;overflow:hidden}.buttons{display:grid;grid-template-columns:repeat(4,1fr);gap:.6em}button{padding:.8em;font-size:clamp(1rem,5vw,1.5rem);border:none;border-radius:12px;cursor:pointer;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;box-shadow:0 6px 12px #0003;transition:.3s;width:100%}button:hover{transform:translateY(-2px);box-shadow:0 10px 18px #00000040}.span-two{grid-column:span 2}button.operator{background:linear-gradient(135deg,#ff758c,#ff7eb3)}button.equal{background:linear-gradient(135deg,#43e97b,#38f9d7)}button.clear{background:linear-gradient(135deg,#f54ea2,#ff7676)}@media (max-width: 480px){.calculator{padding:4vw;border-radius:16px}.buttons{gap:.5em}button{padding:.7em;border-radius:10px}}@media (max-width: 360px){.buttons{grid-template-columns:repeat(3,1fr)}.span-two{grid-column:span 3}}@media (min-width: 481px) and (max-width: 768px){.calculator{max-width:500px}h1{font-size:clamp(1.6rem,4vw,2.2rem)}button{font-size:clamp(1.1rem,3vw,1.6rem)}}@media (min-width: 769px){.calculator{max-width:450px}}: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:none}a:hover{color:#535bf2}body{margin:0;display:flex;flex-direction:column;align-items:center;justify-content:center;min-width:320px;min-height:100vh;padding:1rem;box-sizing:border-box;overflow-x:hidden;transition:background-color .3s,color .3s}h1{font-size:clamp(1.8rem,6vw,3.2rem);line-height:1.2;text-align:center;margin-bottom:1rem;font-weight:700}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:clamp(.9rem,3vw,1.1rem);font-weight:500;font-family:inherit;background-color:#1a1a1a;color:#fff;cursor:pointer;transition:border-color .25s,transform .2s,background-color .3s;width:auto;max-width:100%}button:hover{border-color:#646cff;transform:translateY(-2px)}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media (prefers-color-scheme: light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9;color:#213547}}@media (max-width: 600px){body{padding:.8rem}h1{font-size:clamp(1.5rem,7vw,2rem);margin-bottom:.8rem}button{width:100%;padding:.8em}}@media (max-width: 360px){h1{font-size:1.3rem}button{font-size:.85rem;padding:.6em}}@media (min-width: 601px) and (max-width: 1024px){body{padding:2rem}h1{font-size:clamp(2rem,5vw,2.5rem)}button{font-size:clamp(1rem,2.5vw,1.2rem);padding:.7em 1.5em}}@media (min-width: 1025px){body{padding:3rem}h1{font-size:3rem}button{font-size:1.1rem;padding:.8em 2em}}