*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);min-height:100vh;color:#333}#root{min-height:100vh}.app{min-height:100vh;display:flex;flex-direction:column;align-items:center;padding:2rem;gap:2rem}.header{text-align:center;color:#fff;text-shadow:0 2px 4px rgba(0,0,0,.2)}.header h1{font-size:2.5rem;margin-bottom:.5rem}.subtitle{font-size:1.1rem;opacity:.9}.main{width:100%;max-width:800px;display:flex;flex-direction:column;gap:1.5rem}.card{background:white;border-radius:12px;padding:1.5rem;box-shadow:0 4px 6px #0000001a;transition:transform .2s,box-shadow .2s}.card:hover{transform:translateY(-2px);box-shadow:0 8px 12px #00000026}.card h2{color:#667eea;margin-bottom:1rem;font-size:1.5rem}.message{font-size:1.2rem;color:#555;margin-bottom:1rem;padding:.75rem;background:#f8f9fa;border-radius:8px;border-left:4px solid #667eea}.btn{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:#fff;border:none;padding:.75rem 1.5rem;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s}.btn:hover:not(:disabled){transform:scale(1.05);box-shadow:0 4px 8px #667eea66}.btn:disabled{opacity:.6;cursor:not-allowed}.data-list{list-style:none;margin-bottom:1rem}.data-item{display:flex;justify-content:space-between;align-items:center;padding:.75rem;margin-bottom:.5rem;background:#f8f9fa;border-radius:8px;border-left:4px solid #764ba2}.data-item strong{color:#667eea}.data-item span{color:#666;font-size:.9rem}.echo-form{display:flex;gap:.5rem;margin-bottom:1rem}.input{flex:1;padding:.75rem;border:2px solid #e0e0e0;border-radius:8px;font-size:1rem;transition:border-color .2s}.input:focus{outline:none;border-color:#667eea}.echo-result{background:#f0f4ff;padding:1rem;border-radius:8px;border-left:4px solid #667eea}.echo-result p{margin-bottom:.5rem;font-size:.95rem}.footer{color:#fff;text-align:center;margin-top:auto;padding:1rem;opacity:.8;font-size:.9rem}@media (max-width: 600px){.app{padding:1rem}.header h1{font-size:1.8rem}.echo-form{flex-direction:column}.card{padding:1rem}}