:root{color:#fff;background:#111827;font-family:-apple-system,BlinkMacSystemFont,SF Pro Display,Segoe UI,sans-serif}*{box-sizing:border-box}body{background:#111827;margin:0}#app{justify-content:center;min-height:100vh;display:flex}.app{width:100%;max-width:500px;padding:20px}.header{text-align:center;margin:20px 0 35px}.header h1{margin:0;font-size:2rem}.header p{color:#9ca3af;margin-top:8px}h2{margin-top:35px;margin-bottom:15px;font-size:1.1rem}.menu{flex-direction:column;gap:12px;display:flex}button{text-align:left;color:#fff;cursor:pointer;background:#1f2937;border:none;border-radius:14px;padding:16px;font-size:1rem;transition:background .15s}button:hover{background:#374151}button:active{background:#4b5563}