.app{min-height:100vh;background:linear-gradient(135deg,#667eea,#764ba2);display:flex;justify-content:center;align-items:center;padding:20px}.container{background:#fff;border-radius:12px;box-shadow:0 20px 60px #0000004d;width:100%;max-width:600px;padding:40px}header{text-align:center;margin-bottom:30px}h1{font-size:3rem;margin:0;color:#667eea;font-weight:700}.subtitle{color:#666;margin:5px 0 0;font-size:.9rem}.error{background:#fee;color:#c33;padding:12px;border-radius:6px;margin-bottom:20px;border-left:4px solid #c33}.add-todo-form{display:flex;gap:10px;margin-bottom:30px}.todo-input{flex:1;padding:12px 16px;border:2px solid #e0e0e0;border-radius:8px;font-size:1rem;transition:border-color .2s}.todo-input:focus{outline:none;border-color:#667eea}.add-button{padding:12px 24px;background:#667eea;color:#fff;border:none;border-radius:8px;font-size:1rem;cursor:pointer;transition:background .2s;font-weight:600}.add-button:hover{background:#5568d3}.todo-list{list-style:none;padding:0;margin:0 0 20px}.todo-item{display:flex;align-items:center;gap:12px;padding:16px;border-bottom:1px solid #f0f0f0;transition:background .2s}.todo-item:hover{background:#f9f9f9}.todo-item.completed .todo-title{text-decoration:line-through;color:#999}.todo-checkbox{width:20px;height:20px;cursor:pointer}.todo-title{flex:1;font-size:1rem;color:#333}.delete-button{padding:6px 12px;background:#ff4757;color:#fff;border:none;border-radius:6px;cursor:pointer;font-size:.85rem;transition:background .2s}.delete-button:hover{background:#e34}.empty-state{text-align:center;color:#999;padding:40px 20px;font-style:italic}.loading{text-align:center;color:#999;padding:40px}.stats{display:flex;justify-content:space-between;padding-top:20px;border-top:2px solid #f0f0f0;color:#666;font-size:.9rem}*{box-sizing:border-box}body{margin:0;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}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}