*{margin:0;padding:0;box-sizing:border-box;font-family:'Poppins',sans-serif}
body{background:#f5f7fa;color:#333;display:flex;flex-direction:column;align-items:center;min-height:100vh;padding:20px;transition:0.3s}
h1{font-size:28px;margin-bottom:20px;color:#4a90e2;text-align:center}
.container{background:white;padding:20px;border-radius:12px;box-shadow:0 4px 12px rgba(0,0,0,0.1);width:100%;max-width:800px}
input{width:100%;padding:12px;border:1px solid #ccc;border-radius:8px;font-size:16px;margin-bottom:15px}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:15px}
button{flex:1;padding:12px;background:#4a90e2;color:white;border:none;border-radius:8px;cursor:pointer;font-size:16px;transition:.3s}
button:hover{background:#357abd}
pre{background:#1e1e1e;color:#dcdcdc;padding:15px;border-radius:8px;overflow:auto;max-height:300px;margin-top:10px}
iframe{width:100%;height:300px;border:1px solid #ccc;border-radius:8px;margin-top:10px}

/* Dark Mode */
body.dark{background:#1e1e1e;color:#f1f1f1}
body.dark .container{background:#2c2c2c}
body.dark pre{background:#000;color:#0f0}