.app{min-height:100vh;display:flex;justify-content:center;align-items:flex-start;padding:20px;background:linear-gradient(135deg,#667eea,#764ba2)}.container{background:#fff;border-radius:12px;padding:30px;box-shadow:0 10px 40px #0003;width:100%;max-width:500px;margin-top:50px}h1{margin:0 0 25px;color:#333;text-align:center;font-size:2rem}.input-section{display:flex;gap:10px;margin-bottom:25px}.todo-input{flex:1;padding:12px;border:2px solid #e0e0e0;border-radius:6px;font-size:16px;outline:none;transition:border-color .3s}.todo-input:focus{border-color:#667eea}.add-button{padding:12px 24px;background:#667eea;color:#fff;border:none;border-radius:6px;font-size:16px;cursor:pointer;transition:background .3s;font-weight:600}.add-button:hover{background:#5568d3}.todo-list{list-style:none;padding:0;margin:0}.todo-item{display:flex;align-items:center;gap:12px;padding:15px;margin-bottom:10px;background:#f8f9fa;border-radius:8px;transition:background .2s}.todo-item:hover{background:#e9ecef}.todo-item.completed{opacity:.6}.checkbox{width:20px;height:20px;cursor:pointer}.todo-text{flex:1;font-size:16px;color:#333}.todo-item.completed .todo-text{text-decoration:line-through;color:#888}.delete-button{padding:6px 12px;background:#dc3545;color:#fff;border:none;border-radius:4px;cursor:pointer;font-size:14px;transition:background .3s}.delete-button:hover{background:#c82333}.empty-message{text-align:center;color:#888;padding:30px;font-style:italic}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#root{width:100%;min-height:100vh}