*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);min-height:100vh}.app-container{max-width:600px;margin:40px auto;padding:20px;background:white;border-radius:12px;box-shadow:0 20px 60px #0000004d}h1{color:#333;margin-bottom:30px;text-align:center;font-size:2.5rem}h2{color:#555;margin-bottom:20px;font-size:1.5rem;border-bottom:2px solid #667eea;padding-bottom:10px}.error{background-color:#fee;border:1px solid #fcc;color:#c33;padding:12px;border-radius:6px;margin-bottom:20px;font-weight:500}.input-section{display:flex;gap:10px;margin-bottom:30px}input{flex:1;padding:12px 16px;border:2px solid #ddd;border-radius:6px;font-size:1rem;transition:border-color .3s}input:focus{outline:none;border-color:#667eea}input:disabled{background-color:#f5f5f5;cursor:not-allowed}button{padding:12px 24px;background-color:#667eea;color:#fff;border:none;border-radius:6px;font-size:1rem;font-weight:600;cursor:pointer;transition:background-color .3s,transform .1s}button:hover:not(:disabled){background-color:#5568d3;transform:translateY(-2px)}button:active:not(:disabled){transform:translateY(0)}button:disabled{background-color:#ccc;cursor:not-allowed}.items-section{margin-top:30px}.empty-state{text-align:center;color:#999;font-style:italic;padding:40px 20px;background-color:#f9f9f9;border-radius:6px}.items-list{list-style:none}.item-card{display:flex;justify-content:space-between;align-items:center;padding:15px;margin-bottom:10px;background-color:#f9f9f9;border-left:4px solid #667eea;border-radius:6px;transition:box-shadow .3s}.item-card:hover{box-shadow:0 4px 12px #667eea26}.item-card span{font-size:1.1rem;color:#333;flex:1;word-break:break-word}.delete-btn{padding:8px 16px;background-color:#ff6b6b;margin-left:10px;font-size:.9rem}.delete-btn:hover{background-color:#ee5a52}@media (max-width: 600px){.app-container{margin:20px 10px}h1{font-size:2rem}.item-card{flex-direction:column;align-items:flex-start}.delete-btn{margin-left:0;margin-top:10px;width:100%}}