body{font-family:Segoe UI,sans-serif;background:#f0f2f5;display:flex;justify-content:center;padding-top:50px}.todo-container{background:#fff;padding:24px;border-radius:12px;box-shadow:0 4px 12px #0000001a;width:100%;max-width:500px}input[type=text]{width:calc(100% - 110px);padding:10px;border:1px solid #ccc;border-radius:6px;font-size:1rem}button{padding:10px 14px;border:none;border-radius:6px;font-size:.9rem;cursor:pointer;transition:background-color .2s ease;margin-left:8px}.add-btn{background-color:#4caf50;color:#fff}.add-btn:hover{background-color:#43a047}.task-btn{background-color:#1976d2;color:#fff}.task-btn:hover{background-color:#125ea9}.delete-btn{background-color:#e53935;color:#fff}.delete-btn:hover{background-color:#c62828}.toggle-all-btn{margin-top:20px;width:100%;background-color:#555;color:#fff}.toggle-all-btn:hover{background-color:#333}ul{list-style-type:none;padding-left:0;margin-top:20px}li{background:#f8f8f8;padding:12px;border-radius:8px;margin-bottom:10px;display:flex;justify-content:space-between;align-items:center}.task-text{flex:1;font-size:1rem}.task-done{text-decoration:line-through;color:#888}.task-actions{display:flex;gap:8px;margin-left:10px}