*{margin:0;padding:0;box-sizing:border-box}body{background:#1a1a2e;color:#e8e8f0;font-family:Segoe UI,sans-serif;min-height:100vh}.app{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;gap:20px}h1{font-size:3rem}button{padding:15px 40px;font-size:1.2rem;background:linear-gradient(135deg,#00d4aa,#00a388);border:none;border-radius:10px;color:#fff;cursor:pointer;transition:transform .2s}button:hover{transform:translateY(-2px)}