diff --git a/_spm/repositories/swift-collections-9a58d5cf/FETCH_HEAD b/_spm/repositories/swift-collections-9a58d5cf/FETCH_HEAD
new file mode 100644
index 0000000..a78d4e9
--- /dev/null
+++ b/_spm/repositories/swift-collections-9a58d5cf/FETCH_HEAD
@@ -0,0 +1,469 @@
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+07134a5bce472917a2fc2f2a19401861a688530b	not-for-merge	'refs/pull/81/head' of https://github.com/apple/swift-collections
+3d4aca47308287244f2dd7b9c2085dea63c27b60	not-for-merge	'refs/pull/82/head' of https://github.com/apple/swift-collections
+140a1752fdfa9788db9e5b23ee32d8bdbed4c9f7	not-for-merge	'refs/pull/83/head' of https://github.com/apple/swift-collections
+40ab3405b25719a490abea591d80b7ce27ab8803	not-for-merge	'refs/pull/84/head' of https://github.com/apple/swift-collections
+52f77c4486ea96a3c5ed373932ee0220d5a7ebee	not-for-merge	'refs/pull/85/head' of https://github.com/apple/swift-collections
+029dd258a1d19cbcd8e22523b0811c7dcb6d450a	not-for-merge	'refs/pull/86/head' of https://github.com/apple/swift-collections
+8ef7b779cd17e95baeef138a612c48b063036aca	not-for-merge	'refs/pull/87/head' of https://github.com/apple/swift-collections
+ace0073826e3e2bdc1b08d78e6fe6f1efc700aab	not-for-merge	'refs/pull/9/head' of https://github.com/apple/swift-collections
+e78605942c7fb08c3e8812a166e85bcae2ddd15e	not-for-merge	'refs/pull/91/head' of https://github.com/apple/swift-collections
+7c68b05ed94391100c1933770cd18e95533bd53d	not-for-merge	'refs/pull/92/head' of https://github.com/apple/swift-collections
+d6774be62f7f857f0b30dae49a3a6f02b58e5679	not-for-merge	'refs/pull/93/head' of https://github.com/apple/swift-collections
+6192ad1fc8795b647f8fb9eec20257ae2cb4716d	not-for-merge	'refs/pull/95/head' of https://github.com/apple/swift-collections
+dcdd7ebabbdcac6442e45db68f6e3d10b96f0c88	not-for-merge	'refs/pull/96/head' of https://github.com/apple/swift-collections
+41bfaaae0af3809b808405df0fab4a5e02ddd206	not-for-merge	'refs/pull/97/head' of https://github.com/apple/swift-collections
+462fb1d3fc318f4e1f81d6945b87f1dc32dd8079	not-for-merge	'refs/pull/98/head' of https://github.com/apple/swift-collections
+c1c9541a3b91ec076076ad8e9a4e28a00b80cb6b	not-for-merge	'refs/pull/99/head' of https://github.com/apple/swift-collections
+bd924007a25488900d2e3f3437a0388a97636020	not-for-merge	tag '0.0.1' of https://github.com/apple/swift-collections
+2d719d75a2065f213e58a5164384a3d2fcf9b59a	not-for-merge	tag '0.0.2' of https://github.com/apple/swift-collections
+d45e63421d3dff834949ac69d3c37691e994bd69	not-for-merge	tag '0.0.3' of https://github.com/apple/swift-collections
+3426dba9ee5c9f8e4981b0fc9d39a818d36eec28	not-for-merge	tag '0.0.4' of https://github.com/apple/swift-collections
+0959ba76a1d4a98fd11163aa83fd49c25b93bfae	not-for-merge	tag '0.0.5' of https://github.com/apple/swift-collections
+9d8719c8bebdc79740b6969c912ac706eb721d7a	not-for-merge	tag '0.0.7' of https://github.com/apple/swift-collections
+07e47b1e93e5a1e0ef0c50fcb2d6739fb6be4003	not-for-merge	tag '1.0.0' of https://github.com/apple/swift-collections
+2d33a0ea89c961dcb2b3da2157963d9c0370347e	not-for-merge	tag '1.0.1' of https://github.com/apple/swift-collections
+48254824bb4248676bf7ce56014ff57b142b77eb	not-for-merge	tag '1.0.2' of https://github.com/apple/swift-collections
+f504716c27d2e5d4144fa4794b12129301d17729	not-for-merge	tag '1.0.3' of https://github.com/apple/swift-collections
+937e904258d22af6e447a0b72c0bc67583ef64a2	not-for-merge	tag '1.0.4' of https://github.com/apple/swift-collections
+a902f1823a7ff3c9ab2fba0f992396b948eda307	not-for-merge	tag '1.0.5' of https://github.com/apple/swift-collections
+d029d9d39c87bed85b1c50adee7c41795261a192	not-for-merge	tag '1.0.6' of https://github.com/apple/swift-collections
+94cf62b3ba8d4bed62680a282d4c25f9c63c2efb	not-for-merge	tag '1.1.0' of https://github.com/apple/swift-collections
+ee97538f5b81ae89698fd95938896dec5217b148	not-for-merge	tag '1.1.1' of https://github.com/apple/swift-collections
+3d2dc41a01f9e49d84f0a3925fb858bed64f702d	not-for-merge	tag '1.1.2' of https://github.com/apple/swift-collections
+9bf03ff58ce34478e66aaee630e491823326fd06	not-for-merge	tag '1.1.3' of https://github.com/apple/swift-collections
+671108c96644956dddcd89dd59c203dcdb36cec7	not-for-merge	tag '1.1.4' of https://github.com/apple/swift-collections
+ad9f6723fd29591e6c0a19a9c4982cae51d65b1d	not-for-merge	tag '1.1.5' of https://github.com/apple/swift-collections
+c11818f3cae0780656baa430b49e7f163f08dffd	not-for-merge	tag '1.1.6' of https://github.com/apple/swift-collections
+c1805596154bb3a265fd91b8ac0c4433b4348fb0	not-for-merge	tag '1.2.0' of https://github.com/apple/swift-collections
+8c0c0a8b49e080e54e5e328cc552821ff07cd341	not-for-merge	tag '1.2.1' of https://github.com/apple/swift-collections
+7b847a3b7008b2dc2f47ca3110d8c782fb2e5c7e	not-for-merge	tag '1.3.0' of https://github.com/apple/swift-collections
diff --git a/_spm/repositories/swift-collections-9a58d5cf/HEAD b/_spm/repositories/swift-collections-9a58d5cf/HEAD
new file mode 100644
index 0000000..b870d82
--- /dev/null
+++ b/_spm/repositories/swift-collections-9a58d5cf/HEAD
@@ -0,0 +1 @@
+ref: refs/heads/main
diff --git a/_spm/repositories/swift-collections-9a58d5cf/config b/_spm/repositories/swift-collections-9a58d5cf/config
new file mode 100644
index 0000000..7275a2c
--- /dev/null
+++ b/_spm/repositories/swift-collections-9a58d5cf/config
@@ -0,0 +1,10 @@
+[core]
+	repositoryformatversion = 0
+	filemode = true
+	bare = true
+	ignorecase = true
+	precomposeunicode = true
+[remote "origin"]
+	url = https://github.com/apple/swift-collections.git
+	fetch = +refs/*:refs/*
+	mirror = true
diff --git a/_spm/repositories/swift-collections-9a58d5cf/description b/_spm/repositories/swift-collections-9a58d5cf/description
new file mode 100644
index 0000000..498b267
--- /dev/null
+++ b/_spm/repositories/swift-collections-9a58d5cf/description
@@ -0,0 +1 @@
+Unnamed repository; edit this file 'description' to name the repository.
diff --git a/_spm/repositories/swift-collections-9a58d5cf/hooks/applypatch-msg.sample b/_spm/repositories/swift-collections-9a58d5cf/hooks/applypatch-msg.sample
new file mode 100755
index 0000000..a5d7b84
--- /dev/null
+++ b/_spm/repositories/swift-collections-9a58d5cf/hooks/applypatch-msg.sample
@@ -0,0 +1,15 @@
+#!/bin/sh
+#
+# An example hook script to check the commit log message taken by
+# applypatch from an e-mail message.
+#
+# The hook should exit with non-zero status after issuing an
+# appropriate message if it wants to stop the commit.  The hook is
+# allowed to edit the commit message file.
+#
+# To enable this hook, rename this file to "applypatch-msg".
+
+. git-sh-setup
+commitmsg="$(git rev-parse --git-path hooks/commit-msg)"
+test -x "$commitmsg" && exec "$commitmsg" ${1+"$@"}
+:
diff --git a/_spm/repositories/swift-collections-9a58d5cf/hooks/commit-msg.sample b/_spm/repositories/swift-collections-9a58d5cf/hooks/commit-msg.sample
new file mode 100755
index 0000000..b58d118
--- /dev/null
+++ b/_spm/repositories/swift-collections-9a58d5cf/hooks/commit-msg.sample
@@ -0,0 +1,24 @@
+#!/bin/sh
+#
+# An example hook script to check the commit log message.
+# Called by "git commit" with one argument, the name of the file
+# that has the commit message.  The hook should exit with non-zero
+# status after issuing an appropriate message if it wants to stop the
+# commit.  The hook is allowed to edit the commit message file.
+#
+# To enable this hook, rename this file to "commit-msg".
+
+# Uncomment the below to add a Signed-off-by line to the message.
+# Doing this in a hook is a bad idea in general, but the prepare-commit-msg
+# hook is more suited to it.
+#
+# SOB=$(git var GIT_AUTHOR_IDENT | sed -n 's/^\(.*>\).*$/Signed-off-by: \1/p')
+# grep -qs "^$SOB" "$1" || echo "$SOB" >> "$1"
+
+# This example catches duplicate Signed-off-by lines.
+
+test "" = "$(grep '^Signed-off-by: ' "$1" |
+	 sort | uniq -c | sed -e '/^[ 	]*1[ 	]/d')" || {
+	echo >&2 Duplicate Signed-off-by lines.
+	exit 1
+}
diff --git a/_spm/repositories/swift-collections-9a58d5cf/hooks/fsmonitor-watchman.sample b/_spm/repositories/swift-collections-9a58d5cf/hooks/fsmonitor-watchman.sample
new file mode 100755
index 0000000..23e856f
--- /dev/null
+++ b/_spm/repositories/swift-collections-9a58d5cf/hooks/fsmonitor-watchman.sample
@@ -0,0 +1,174 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+use IPC::Open2;
+
+# An example hook script to integrate Watchman
+# (https://facebook.github.io/watchman/) with git to speed up detecting
+# new and modified files.
+#
+# The hook is passed a version (currently 2) and last update token
+# formatted as a string and outputs to stdout a new update token and
+# all files that have been modified since the update token. Paths must
+# be relative to the root of the working tree and separated by a single NUL.
+#
+# To enable this hook, rename this file to "query-watchman" and set
+# 'git config core.fsmonitor .git/hooks/query-watchman'
+#
+my ($version, $last_update_token) = @ARGV;
+
+# Uncomment for debugging
+# print STDERR "$0 $version $last_update_token\n";
+
+# Check the hook interface version
+if ($version ne 2) {
+	die "Unsupported query-fsmonitor hook version '$version'.\n" .
+	    "Falling back to scanning...\n";
+}
+
+my $git_work_tree = get_working_dir();
+
+my $retry = 1;
+
+my $json_pkg;
+eval {
+	require JSON::XS;
+	$json_pkg = "JSON::XS";
+	1;
+} or do {
+	require JSON::PP;
+	$json_pkg = "JSON::PP";
+};
+
+launch_watchman();
+
+sub launch_watchman {
+	my $o = watchman_query();
+	if (is_work_tree_watched($o)) {
+		output_result($o->{clock}, @{$o->{files}});
+	}
+}
+
+sub output_result {
+	my ($clockid, @files) = @_;
+
+	# Uncomment for debugging watchman output
+	# open (my $fh, ">", ".git/watchman-output.out");
+	# binmode $fh, ":utf8";
+	# print $fh "$clockid\n@files\n";
+	# close $fh;
+
+	binmode STDOUT, ":utf8";
+	print $clockid;
+	print "\0";
+	local $, = "\0";
+	print @files;
+}
+
+sub watchman_clock {
+	my $response = qx/watchman clock "$git_work_tree"/;
+	die "Failed to get clock id on '$git_work_tree'.\n" .
+		"Falling back to scanning...\n" if $? != 0;
+
+	return $json_pkg->new->utf8->decode($response);
+}
+
+sub watchman_query {
+	my $pid = open2(\*CHLD_OUT, \*CHLD_IN, 'watchman -j --no-pretty')
+	or die "open2() failed: $!\n" .
+	"Falling back to scanning...\n";
+
+	# In the query expression below we're asking for names of files that
+	# changed since $last_update_token but not from the .git folder.
+	#
+	# To accomplish this, we're using the "since" generator to use the
+	# recency index to select candidate nodes and "fields" to limit the
+	# output to file names only. Then we're using the "expression" term to
+	# further constrain the results.
+	my $last_update_line = "";
+	if (substr($last_update_token, 0, 1) eq "c") {
+		$last_update_token = "\"$last_update_token\"";
+		$last_update_line = qq[\n"since": $last_update_token,];
+	}
+	my $query = <<"	END";
+		["query", "$git_work_tree", {$last_update_line
+			"fields": ["name"],
+			"expression": ["not", ["dirname", ".git"]]
+		}]
+	END
+
+	# Uncomment for debugging the watchman query
+	# open (my $fh, ">", ".git/watchman-query.json");
+	# print $fh $query;
+	# close $fh;
+
+	print CHLD_IN $query;
+	close CHLD_IN;
+	my $response = do {local $/; <CHLD_OUT>};
+
+	# Uncomment for debugging the watch response
+	# open ($fh, ">", ".git/watchman-response.json");
+	# print $fh $response;
+	# close $fh;
+
+	die "Watchman: command returned no output.\n" .
+	"Falling back to scanning...\n" if $response eq "";
+	die "Watchman: command returned invalid output: $response\n" .
+	"Falling back to scanning...\n" unless $response =~ /^\{/;
+
+	return $json_pkg->new->utf8->decode($response);
+}
+
+sub is_work_tree_watched {
+	my ($output) = @_;
+	my $error = $output->{error};
+	if ($retry > 0 and $error and $error =~ m/unable to resolve root .* directory (.*) is not watched/) {
+		$retry--;
+		my $response = qx/watchman watch "$git_work_tree"/;
+		die "Failed to make watchman watch '$git_work_tree'.\n" .
+		    "Falling back to scanning...\n" if $? != 0;
+		$output = $json_pkg->new->utf8->decode($response);
+		$error = $output->{error};
+		die "Watchman: $error.\n" .
+		"Falling back to scanning...\n" if $error;
+
+		# Uncomment for debugging watchman output
+		# open (my $fh, ">", ".git/watchman-output.out");
+		# close $fh;
+
+		# Watchman will always return all files on the first query so
+		# return the fast "everything is dirty" flag to git and do the
+		# Watchman query just to get it over with now so we won't pay
+		# the cost in git to look up each individual file.
+		my $o = watchman_clock();
+		$error = $output->{error};
+
+		die "Watchman: $error.\n" .
+		"Falling back to scanning...\n" if $error;
+
+		output_result($o->{clock}, ("/"));
+		$last_update_token = $o->{clock};
+
+		eval { launch_watchman() };
+		return 0;
+	}
+
+	die "Watchman: $error.\n" .
+	"Falling back to scanning...\n" if $error;
+
+	return 1;
+}
+
+sub get_working_dir {
+	my $working_dir;
+	if ($^O =~ 'msys' || $^O =~ 'cygwin') {
+		$working_dir = Win32::GetCwd();
+		$working_dir =~ tr/\\/\//;
+	} else {
+		require Cwd;
+		$working_dir = Cwd::cwd();
+	}
+
+	return $working_dir;
+}
diff --git a/_spm/repositories/swift-collections-9a58d5cf/hooks/post-update.sample b/_spm/repositories/swift-collections-9a58d5cf/hooks/post-update.sample
new file mode 100755
index 0000000..ec17ec1
--- /dev/null
+++ b/_spm/repositories/swift-collections-9a58d5cf/hooks/post-update.sample
@@ -0,0 +1,8 @@
+#!/bin/sh
+#
+# An example hook script to prepare a packed repository for use over
+# dumb transports.
+#
+# To enable this hook, rename this file to "post-update".
+
+exec git update-server-info
diff --git a/_spm/repositories/swift-collections-9a58d5cf/hooks/pre-applypatch.sample b/_spm/repositories/swift-collections-9a58d5cf/hooks/pre-applypatch.sample
new file mode 100755
index 0000000..4142082
--- /dev/null
+++ b/_spm/repositories/swift-collections-9a58d5cf/hooks/pre-applypatch.sample
@@ -0,0 +1,14 @@
+#!/bin/sh
+#
+# An example hook script to verify what is about to be committed
+# by applypatch from an e-mail message.
+#
+# The hook should exit with non-zero status after issuing an
+# appropriate message if it wants to stop the commit.
+#
+# To enable this hook, rename this file to "pre-applypatch".
+
+. git-sh-setup
+precommit="$(git rev-parse --git-path hooks/pre-commit)"
+test -x "$precommit" && exec "$precommit" ${1+"$@"}
+:
diff --git a/_spm/repositories/swift-collections-9a58d5cf/hooks/pre-commit.sample b/_spm/repositories/swift-collections-9a58d5cf/hooks/pre-commit.sample
new file mode 100755
index 0000000..e144712
--- /dev/null
+++ b/_spm/repositories/swift-collections-9a58d5cf/hooks/pre-commit.sample
@@ -0,0 +1,49 @@
+#!/bin/sh
+#
+# An example hook script to verify what is about to be committed.
+# Called by "git commit" with no arguments.  The hook should
+# exit with non-zero status after issuing an appropriate message if
+# it wants to stop the commit.
+#
+# To enable this hook, rename this file to "pre-commit".
+
+if git rev-parse --verify HEAD >/dev/null 2>&1
+then
+	against=HEAD
+else
+	# Initial commit: diff against an empty tree object
+	against=$(git hash-object -t tree /dev/null)
+fi
+
+# If you want to allow non-ASCII filenames set this variable to true.
+allownonascii=$(git config --type=bool hooks.allownonascii)
+
+# Redirect output to stderr.
+exec 1>&2
+
+# Cross platform projects tend to avoid non-ASCII filenames; prevent
+# them from being added to the repository. We exploit the fact that the
+# printable range starts at the space character and ends with tilde.
+if [ "$allownonascii" != "true" ] &&
+	# Note that the use of brackets around a tr range is ok here, (it's
+	# even required, for portability to Solaris 10's /usr/bin/tr), since
+	# the square bracket bytes happen to fall in the designated range.
+	test $(git diff --cached --name-only --diff-filter=A -z $against |
+	  LC_ALL=C tr -d '[ -~]\0' | wc -c) != 0
+then
+	cat <<\EOF
+Error: Attempt to add a non-ASCII file name.
+
+This can cause problems if you want to work with people on other platforms.
+
+To be portable it is advisable to rename the file.
+
+If you know what you are doing you can disable this check using:
+
+  git config hooks.allownonascii true
+EOF
+	exit 1
+fi
+
+# If there are whitespace errors, print the offending file names and fail.
+exec git diff-index --check --cached $against --
diff --git a/_spm/repositories/swift-collections-9a58d5cf/hooks/pre-merge-commit.sample b/_spm/repositories/swift-collections-9a58d5cf/hooks/pre-merge-commit.sample
new file mode 100755
index 0000000..399eab1
--- /dev/null
+++ b/_spm/repositories/swift-collections-9a58d5cf/hooks/pre-merge-commit.sample
@@ -0,0 +1,13 @@
+#!/bin/sh
+#
+# An example hook script to verify what is about to be committed.
+# Called by "git merge" with no arguments.  The hook should
+# exit with non-zero status after issuing an appropriate message to
+# stderr if it wants to stop the merge commit.
+#
+# To enable this hook, rename this file to "pre-merge-commit".
+
+. git-sh-setup
+test -x "$GIT_DIR/hooks/pre-commit" &&
+        exec "$GIT_DIR/hooks/pre-commit"
+:
diff --git a/_spm/repositories/swift-collections-9a58d5cf/hooks/pre-push.sample b/_spm/repositories/swift-collections-9a58d5cf/hooks/pre-push.sample
new file mode 100755
index 0000000..4ce688d
--- /dev/null
+++ b/_spm/repositories/swift-collections-9a58d5cf/hooks/pre-push.sample
@@ -0,0 +1,53 @@
+#!/bin/sh
+
+# An example hook script to verify what is about to be pushed.  Called by "git
+# push" after it has checked the remote status, but before anything has been
+# pushed.  If this script exits with a non-zero status nothing will be pushed.
+#
+# This hook is called with the following parameters:
+#
+# $1 -- Name of the remote to which the push is being done
+# $2 -- URL to which the push is being done
+#
+# If pushing without using a named remote those arguments will be equal.
+#
+# Information about the commits which are being pushed is supplied as lines to
+# the standard input in the form:
+#
+#   <local ref> <local oid> <remote ref> <remote oid>
+#
+# This sample shows how to prevent push of commits where the log message starts
+# with "WIP" (work in progress).
+
+remote="$1"
+url="$2"
+
+zero=$(git hash-object --stdin </dev/null | tr '[0-9a-f]' '0')
+
+while read local_ref local_oid remote_ref remote_oid
+do
+	if test "$local_oid" = "$zero"
+	then
+		# Handle delete
+		:
+	else
+		if test "$remote_oid" = "$zero"
+		then
+			# New branch, examine all commits
+			range="$local_oid"
+		else
+			# Update to existing branch, examine new commits
+			range="$remote_oid..$local_oid"
+		fi
+
+		# Check for WIP commit
+		commit=$(git rev-list -n 1 --grep '^WIP' "$range")
+		if test -n "$commit"
+		then
+			echo >&2 "Found WIP commit in $local_ref, not pushing"
+			exit 1
+		fi
+	fi
+done
+
+exit 0
diff --git a/_spm/repositories/swift-collections-9a58d5cf/hooks/pre-rebase.sample b/_spm/repositories/swift-collections-9a58d5cf/hooks/pre-rebase.sample
new file mode 100755
index 0000000..6cbef5c
--- /dev/null
+++ b/_spm/repositories/swift-collections-9a58d5cf/hooks/pre-rebase.sample
@@ -0,0 +1,169 @@
+#!/bin/sh
+#
+# Copyright (c) 2006, 2008 Junio C Hamano
+#
+# The "pre-rebase" hook is run just before "git rebase" starts doing
+# its job, and can prevent the command from running by exiting with
+# non-zero status.
+#
+# The hook is called with the following parameters:
+#
+# $1 -- the upstream the series was forked from.
+# $2 -- the branch being rebased (or empty when rebasing the current branch).
+#
+# This sample shows how to prevent topic branches that are already
+# merged to 'next' branch from getting rebased, because allowing it
+# would result in rebasing already published history.
+
+publish=next
+basebranch="$1"
+if test "$#" = 2
+then
+	topic="refs/heads/$2"
+else
+	topic=`git symbolic-ref HEAD` ||
+	exit 0 ;# we do not interrupt rebasing detached HEAD
+fi
+
+case "$topic" in
+refs/heads/??/*)
+	;;
+*)
+	exit 0 ;# we do not interrupt others.
+	;;
+esac
+
+# Now we are dealing with a topic branch being rebased
+# on top of master.  Is it OK to rebase it?
+
+# Does the topic really exist?
+git show-ref -q "$topic" || {
+	echo >&2 "No such branch $topic"
+	exit 1
+}
+
+# Is topic fully merged to master?
+not_in_master=`git rev-list --pretty=oneline ^master "$topic"`
+if test -z "$not_in_master"
+then
+	echo >&2 "$topic is fully merged to master; better remove it."
+	exit 1 ;# we could allow it, but there is no point.
+fi
+
+# Is topic ever merged to next?  If so you should not be rebasing it.
+only_next_1=`git rev-list ^master "^$topic" ${publish} | sort`
+only_next_2=`git rev-list ^master           ${publish} | sort`
+if test "$only_next_1" = "$only_next_2"
+then
+	not_in_topic=`git rev-list "^$topic" master`
+	if test -z "$not_in_topic"
+	then
+		echo >&2 "$topic is already up to date with master"
+		exit 1 ;# we could allow it, but there is no point.
+	else
+		exit 0
+	fi
+else
+	not_in_next=`git rev-list --pretty=oneline ^${publish} "$topic"`
+	/usr/bin/perl -e '
+		my $topic = $ARGV[0];
+		my $msg = "* $topic has commits already merged to public branch:\n";
+		my (%not_in_next) = map {
+			/^([0-9a-f]+) /;
+			($1 => 1);
+		} split(/\n/, $ARGV[1]);
+		for my $elem (map {
+				/^([0-9a-f]+) (.*)$/;
+				[$1 => $2];
+			} split(/\n/, $ARGV[2])) {
+			if (!exists $not_in_next{$elem->[0]}) {
+				if ($msg) {
+					print STDERR $msg;
+					undef $msg;
+				}
+				print STDERR " $elem->[1]\n";
+			}
+		}
+	' "$topic" "$not_in_next" "$not_in_master"
+	exit 1
+fi
+
+<<\DOC_END
+
+This sample hook safeguards topic branches that have been
+published from being rewound.
+
+The workflow assumed here is:
+
+ * Once a topic branch forks from "master", "master" is never
+   merged into it again (either directly or indirectly).
+
+ * Once a topic branch is fully cooked and merged into "master",
+   it is deleted.  If you need to build on top of it to correct
+   earlier mistakes, a new topic branch is created by forking at
+   the tip of the "master".  This is not strictly necessary, but
+   it makes it easier to keep your history simple.
+
+ * Whenever you need to test or publish your changes to topic
+   branches, merge them into "next" branch.
+
+The script, being an example, hardcodes the publish branch name
+to be "next", but it is trivial to make it configurable via
+$GIT_DIR/config mechanism.
+
+With this workflow, you would want to know:
+
+(1) ... if a topic branch has ever been merged to "next".  Young
+    topic branches can have stupid mistakes you would rather
+    clean up before publishing, and things that have not been
+    merged into other branches can be easily rebased without
+    affecting other people.  But once it is published, you would
+    not want to rewind it.
+
+(2) ... if a topic branch has been fully merged to "master".
+    Then you can delete it.  More importantly, you should not
+    build on top of it -- other people may already want to
+    change things related to the topic as patches against your
+    "master", so if you need further changes, it is better to
+    fork the topic (perhaps with the same name) afresh from the
+    tip of "master".
+
+Let's look at this example:
+
+		   o---o---o---o---o---o---o---o---o---o "next"
+		  /       /           /           /
+		 /   a---a---b A     /           /
+		/   /               /           /
+	       /   /   c---c---c---c B         /
+	      /   /   /             \         /
+	     /   /   /   b---b C     \       /
+	    /   /   /   /             \     /
+    ---o---o---o---o---o---o---o---o---o---o---o "master"
+
+
+A, B and C are topic branches.
+
+ * A has one fix since it was merged up to "next".
+
+ * B has finished.  It has been fully merged up to "master" and "next",
+   and is ready to be deleted.
+
+ * C has not merged to "next" at all.
+
+We would want to allow C to be rebased, refuse A, and encourage
+B to be deleted.
+
+To compute (1):
+
+	git rev-list ^master ^topic next
+	git rev-list ^master        next
+
+	if these match, topic has not merged in next at all.
+
+To compute (2):
+
+	git rev-list master..topic
+
+	if this is empty, it is fully merged to "master".
+
+DOC_END
diff --git a/_spm/repositories/swift-collections-9a58d5cf/hooks/pre-receive.sample b/_spm/repositories/swift-collections-9a58d5cf/hooks/pre-receive.sample
new file mode 100755
index 0000000..a1fd29e
--- /dev/null
+++ b/_spm/repositories/swift-collections-9a58d5cf/hooks/pre-receive.sample
@@ -0,0 +1,24 @@
+#!/bin/sh
+#
+# An example hook script to make use of push options.
+# The example simply echoes all push options that start with 'echoback='
+# and rejects all pushes when the "reject" push option is used.
+#
+# To enable this hook, rename this file to "pre-receive".
+
+if test -n "$GIT_PUSH_OPTION_COUNT"
+then
+	i=0
+	while test "$i" -lt "$GIT_PUSH_OPTION_COUNT"
+	do
+		eval "value=\$GIT_PUSH_OPTION_$i"
+		case "$value" in
+		echoback=*)
+			echo "echo from the pre-receive-hook: ${value#*=}" >&2
+			;;
+		reject)
+			exit 1
+		esac
+		i=$((i + 1))
+	done
+fi
diff --git a/_spm/repositories/swift-collections-9a58d5cf/hooks/prepare-commit-msg.sample b/_spm/repositories/swift-collections-9a58d5cf/hooks/prepare-commit-msg.sample
new file mode 100755
index 0000000..10fa14c
--- /dev/null
+++ b/_spm/repositories/swift-collections-9a58d5cf/hooks/prepare-commit-msg.sample
@@ -0,0 +1,42 @@
+#!/bin/sh
+#
+# An example hook script to prepare the commit log message.
+# Called by "git commit" with the name of the file that has the
+# commit message, followed by the description of the commit
+# message's source.  The hook's purpose is to edit the commit
+# message file.  If the hook fails with a non-zero status,
+# the commit is aborted.
+#
+# To enable this hook, rename this file to "prepare-commit-msg".
+
+# This hook includes three examples. The first one removes the
+# "# Please enter the commit message..." help message.
+#
+# The second includes the output of "git diff --name-status -r"
+# into the message, just before the "git status" output.  It is
+# commented because it doesn't cope with --amend or with squashed
+# commits.
+#
+# The third example adds a Signed-off-by line to the message, that can
+# still be edited.  This is rarely a good idea.
+
+COMMIT_MSG_FILE=$1
+COMMIT_SOURCE=$2
+SHA1=$3
+
+/usr/bin/perl -i.bak -ne 'print unless(m/^. Please enter the commit message/..m/^#$/)' "$COMMIT_MSG_FILE"
+
+# case "$COMMIT_SOURCE,$SHA1" in
+#  ,|template,)
+#    /usr/bin/perl -i.bak -pe '
+#       print "\n" . `git diff --cached --name-status -r`
+# 	 if /^#/ && $first++ == 0' "$COMMIT_MSG_FILE" ;;
+#  *) ;;
+# esac
+
+# SOB=$(git var GIT_COMMITTER_IDENT | sed -n 's/^\(.*>\).*$/Signed-off-by: \1/p')
+# git interpret-trailers --in-place --trailer "$SOB" "$COMMIT_MSG_FILE"
+# if test -z "$COMMIT_SOURCE"
+# then
+#   /usr/bin/perl -i.bak -pe 'print "\n" if !$first_line++' "$COMMIT_MSG_FILE"
+# fi
diff --git a/_spm/repositories/swift-collections-9a58d5cf/hooks/push-to-checkout.sample b/_spm/repositories/swift-collections-9a58d5cf/hooks/push-to-checkout.sample
new file mode 100755
index 0000000..af5a0c0
--- /dev/null
+++ b/_spm/repositories/swift-collections-9a58d5cf/hooks/push-to-checkout.sample
@@ -0,0 +1,78 @@
+#!/bin/sh
+
+# An example hook script to update a checked-out tree on a git push.
+#
+# This hook is invoked by git-receive-pack(1) when it reacts to git
+# push and updates reference(s) in its repository, and when the push
+# tries to update the branch that is currently checked out and the
+# receive.denyCurrentBranch configuration variable is set to
+# updateInstead.
+#
+# By default, such a push is refused if the working tree and the index
+# of the remote repository has any difference from the currently
+# checked out commit; when both the working tree and the index match
+# the current commit, they are updated to match the newly pushed tip
+# of the branch. This hook is to be used to override the default
+# behaviour; however the code below reimplements the default behaviour
+# as a starting point for convenient modification.
+#
+# The hook receives the commit with which the tip of the current
+# branch is going to be updated:
+commit=$1
+
+# It can exit with a non-zero status to refuse the push (when it does
+# so, it must not modify the index or the working tree).
+die () {
+	echo >&2 "$*"
+	exit 1
+}
+
+# Or it can make any necessary changes to the working tree and to the
+# index to bring them to the desired state when the tip of the current
+# branch is updated to the new commit, and exit with a zero status.
+#
+# For example, the hook can simply run git read-tree -u -m HEAD "$1"
+# in order to emulate git fetch that is run in the reverse direction
+# with git push, as the two-tree form of git read-tree -u -m is
+# essentially the same as git switch or git checkout that switches
+# branches while keeping the local changes in the working tree that do
+# not interfere with the difference between the branches.
+
+# The below is a more-or-less exact translation to shell of the C code
+# for the default behaviour for git's push-to-checkout hook defined in
+# the push_to_deploy() function in builtin/receive-pack.c.
+#
+# Note that the hook will be executed from the repository directory,
+# not from the working tree, so if you want to perform operations on
+# the working tree, you will have to adapt your code accordingly, e.g.
+# by adding "cd .." or using relative paths.
+
+if ! git update-index -q --ignore-submodules --refresh
+then
+	die "Up-to-date check failed"
+fi
+
+if ! git diff-files --quiet --ignore-submodules --
+then
+	die "Working directory has unstaged changes"
+fi
+
+# This is a rough translation of:
+#
+#   head_has_history() ? "HEAD" : EMPTY_TREE_SHA1_HEX
+if git cat-file -e HEAD 2>/dev/null
+then
+	head=HEAD
+else
+	head=$(git hash-object -t tree --stdin </dev/null)
+fi
+
+if ! git diff-index --quiet --cached --ignore-submodules $head --
+then
+	die "Working directory has staged changes"
+fi
+
+if ! git read-tree -u -m "$commit"
+then
+	die "Could not update working tree to new HEAD"
+fi
diff --git a/_spm/repositories/swift-collections-9a58d5cf/hooks/update.sample b/_spm/repositories/swift-collections-9a58d5cf/hooks/update.sample
new file mode 100755
index 0000000..c4d426b
--- /dev/null
+++ b/_spm/repositories/swift-collections-9a58d5cf/hooks/update.sample
@@ -0,0 +1,128 @@
+#!/bin/sh
+#
+# An example hook script to block unannotated tags from entering.
+# Called by "git receive-pack" with arguments: refname sha1-old sha1-new
+#
+# To enable this hook, rename this file to "update".
+#
+# Config
+# ------
+# hooks.allowunannotated
+#   This boolean sets whether unannotated tags will be allowed into the
+#   repository.  By default they won't be.
+# hooks.allowdeletetag
+#   This boolean sets whether deleting tags will be allowed in the
+#   repository.  By default they won't be.
+# hooks.allowmodifytag
+#   This boolean sets whether a tag may be modified after creation. By default
+#   it won't be.
+# hooks.allowdeletebranch
+#   This boolean sets whether deleting branches will be allowed in the
+#   repository.  By default they won't be.
+# hooks.denycreatebranch
+#   This boolean sets whether remotely creating branches will be denied
+#   in the repository.  By default this is allowed.
+#
+
+# --- Command line
+refname="$1"
+oldrev="$2"
+newrev="$3"
+
+# --- Safety check
+if [ -z "$GIT_DIR" ]; then
+	echo "Don't run this script from the command line." >&2
+	echo " (if you want, you could supply GIT_DIR then run" >&2
+	echo "  $0 <ref> <oldrev> <newrev>)" >&2
+	exit 1
+fi
+
+if [ -z "$refname" -o -z "$oldrev" -o -z "$newrev" ]; then
+	echo "usage: $0 <ref> <oldrev> <newrev>" >&2
+	exit 1
+fi
+
+# --- Config
+allowunannotated=$(git config --type=bool hooks.allowunannotated)
+allowdeletebranch=$(git config --type=bool hooks.allowdeletebranch)
+denycreatebranch=$(git config --type=bool hooks.denycreatebranch)
+allowdeletetag=$(git config --type=bool hooks.allowdeletetag)
+allowmodifytag=$(git config --type=bool hooks.allowmodifytag)
+
+# check for no description
+projectdesc=$(sed -e '1q' "$GIT_DIR/description")
+case "$projectdesc" in
+"Unnamed repository"* | "")
+	echo "*** Project description file hasn't been set" >&2
+	exit 1
+	;;
+esac
+
+# --- Check types
+# if $newrev is 0000...0000, it's a commit to delete a ref.
+zero=$(git hash-object --stdin </dev/null | tr '[0-9a-f]' '0')
+if [ "$newrev" = "$zero" ]; then
+	newrev_type=delete
+else
+	newrev_type=$(git cat-file -t $newrev)
+fi
+
+case "$refname","$newrev_type" in
+	refs/tags/*,commit)
+		# un-annotated tag
+		short_refname=${refname##refs/tags/}
+		if [ "$allowunannotated" != "true" ]; then
+			echo "*** The un-annotated tag, $short_refname, is not allowed in this repository" >&2
+			echo "*** Use 'git tag [ -a | -s ]' for tags you want to propagate." >&2
+			exit 1
+		fi
+		;;
+	refs/tags/*,delete)
+		# delete tag
+		if [ "$allowdeletetag" != "true" ]; then
+			echo "*** Deleting a tag is not allowed in this repository" >&2
+			exit 1
+		fi
+		;;
+	refs/tags/*,tag)
+		# annotated tag
+		if [ "$allowmodifytag" != "true" ] && git rev-parse $refname > /dev/null 2>&1
+		then
+			echo "*** Tag '$refname' already exists." >&2
+			echo "*** Modifying a tag is not allowed in this repository." >&2
+			exit 1
+		fi
+		;;
+	refs/heads/*,commit)
+		# branch
+		if [ "$oldrev" = "$zero" -a "$denycreatebranch" = "true" ]; then
+			echo "*** Creating a branch is not allowed in this repository" >&2
+			exit 1
+		fi
+		;;
+	refs/heads/*,delete)
+		# delete branch
+		if [ "$allowdeletebranch" != "true" ]; then
+			echo "*** Deleting a branch is not allowed in this repository" >&2
+			exit 1
+		fi
+		;;
+	refs/remotes/*,commit)
+		# tracking branch
+		;;
+	refs/remotes/*,delete)
+		# delete tracking branch
+		if [ "$allowdeletebranch" != "true" ]; then
+			echo "*** Deleting a tracking branch is not allowed in this repository" >&2
+			exit 1
+		fi
+		;;
+	*)
+		# Anything else (is there anything else?)
+		echo "*** Update hook: unknown type of update to ref $refname of type $newrev_type" >&2
+		exit 1
+		;;
+esac
+
+# --- Finished
+exit 0
diff --git a/_spm/repositories/swift-collections-9a58d5cf/info/exclude b/_spm/repositories/swift-collections-9a58d5cf/info/exclude
new file mode 100644
index 0000000..a5196d1
--- /dev/null
+++ b/_spm/repositories/swift-collections-9a58d5cf/info/exclude
@@ -0,0 +1,6 @@
+# git ls-files --others --exclude-from=.git/info/exclude
+# Lines that start with '#' are comments.
+# For a project mostly in C, the following would be a good set of
+# exclude patterns (uncomment them if you want to use them):
+# *.[oa]
+# *~
diff --git a/_spm/repositories/swift-collections-9a58d5cf/objects/pack/pack-28447238b9290d4677b09a0fc96325a19294b5ba.idx b/_spm/repositories/swift-collections-9a58d5cf/objects/pack/pack-28447238b9290d4677b09a0fc96325a19294b5ba.idx
new file mode 100644
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new file mode 100644
index 0000000..c40250e
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diff --git a/_spm/repositories/swift-collections-9a58d5cf/objects/pack/pack-c04e06fb0330f31e7d742acd5d97f3d070ca42f2.idx b/_spm/repositories/swift-collections-9a58d5cf/objects/pack/pack-c04e06fb0330f31e7d742acd5d97f3d070ca42f2.idx
new file mode 100644
index 0000000..d3625aa
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diff --git a/_spm/repositories/swift-collections-9a58d5cf/objects/pack/pack-c04e06fb0330f31e7d742acd5d97f3d070ca42f2.pack b/_spm/repositories/swift-collections-9a58d5cf/objects/pack/pack-c04e06fb0330f31e7d742acd5d97f3d070ca42f2.pack
new file mode 100644
index 0000000..9f3acf7
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diff --git a/_spm/repositories/swift-collections-9a58d5cf/packed-refs b/_spm/repositories/swift-collections-9a58d5cf/packed-refs
new file mode 100644
index 0000000..b0dff96
--- /dev/null
+++ b/_spm/repositories/swift-collections-9a58d5cf/packed-refs
@@ -0,0 +1,466 @@
+# pack-refs with: peeled fully-peeled sorted 
+1f8dcd4726717a4b724e5408ca24829bdef67a49 refs/heads/action-xcode-versions
+7ae9880f0fb622992a8a5328fd4af78af5b6b26f refs/heads/dn/remove-retain-release-during-find
+ddff9004d745c4b2d13e35ebdd1a3d0b67e14717 refs/heads/doc-basic-span-index-mutation
+ebd51171f0e45788e2cdb3cc6d54233e11d7443c refs/heads/future
+39b83a1f44289d67e422b6030c498b8a2c6ff7ce refs/heads/main
+68c32ed80b138d1f8a6ec5dcf1b105f32fcaaf12 refs/heads/maxd/run-wasm-tests
+762bc5757de4bcf86cc3b3266e3df93f76469089 refs/heads/nate/zip_dispatch_benchmarking
+d029d9d39c87bed85b1c50adee7c41795261a192 refs/heads/release/1.0
+c11818f3cae0780656baa430b49e7f163f08dffd refs/heads/release/1.1
+2d1f4172091ca272b461397748fd2c32847036dd refs/heads/release/1.2
+c55cbe540366c704c279298ca6ad4c09a067ebe0 refs/heads/release/1.3
+a26fc8e7e4c6e0d63b08951f5b7268044fb95c83 refs/heads/span-prototype
+434d30dae30fbb57699370260c69c2108c1abf8f refs/heads/wasm-tests
+c65cd649fb91f64636f2f1ef5da4991987139f68 refs/pull/10/head
+6a9703c3f13061291eff1baf8af4fce1e6ce35af refs/pull/100/head
+8303a77bc2915be76777d6fc17b702146b6fb192 refs/pull/102/head
+6cd03922372c85e2dca476f665527976911e7397 refs/pull/105/head
+96100d4b6ad61bbfbf549ee42dc73239325b353f refs/pull/106/head
+f69104b5071ef9a44112e3c4fef8904b5e8b6d73 refs/pull/107/head
+5f255a887e51093f058e7ee9ea0b959051be38d4 refs/pull/108/head
+c46c77f7f85f9efe83cc5cb8d54b32c538b06450 refs/pull/109/head
+cfca1038b53eecd4fc50da15cc715f966904012e refs/pull/11/head
+103008aca495f3b80a50713086d451b08cef9f50 refs/pull/110/head
+39a16a15cc8c7e11486015d2deb78468b4a64c85 refs/pull/111/head
+7f57a0ed1c8b1d44eacab95d3cfd57d87482b25a refs/pull/112/head
+efefae56531b30d75553f234134e3c83bd26c6a6 refs/pull/113/head
+565b1ab20bef052f52fad4ebe112803facb325e3 refs/pull/114/head
+8b3af12ece11ea7b0e748749c39a59c59269ca25 refs/pull/115/head
+8be0f192e8f120969427cb2645aabe6f5fdf15a1 refs/pull/116/head
+771bca404c0ee603bb6cc2ea3a19cfc4ebc3d001 refs/pull/117/head
+95be379a3ac1e4278d114a22501267065062b39a refs/pull/118/head
+f41f2cae69dc6ffcc178227a0a46607561fa925c refs/pull/119/head
+276ddee5df4ea0f44c5edea0dbe726cb74682498 refs/pull/121/head
+1c1e6206fa1a4b0a6bf97ac979f841c1d1821ad7 refs/pull/122/head
+074b0ad21387e767b5b3ff1cb014a118a3b80bde refs/pull/123/head
+ddc8b9c66d07cb0af38e98ca160f1f7cc85c88d3 refs/pull/126/head
+9dde4b560323d43ec2ca8225a6c5c79a9bc0735d refs/pull/128/head
+453adb695f615886cd7a897d62676713aeb25bf9 refs/pull/13/head
+286fedb1e8f6b2567cd214cf1127a9322dea1400 refs/pull/130/head
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@@ -0,0 +1,30 @@
+{
+  "object" : {
+    "artifacts" : [
+
+    ],
+    "dependencies" : [
+      {
+        "basedOn" : null,
+        "packageRef" : {
+          "identity" : "swift-collections",
+          "kind" : "remoteSourceControl",
+          "location" : "https://github.com/apple/swift-collections.git",
+          "name" : "swift-collections"
+        },
+        "state" : {
+          "checkoutState" : {
+            "revision" : "7b847a3b7008b2dc2f47ca3110d8c782fb2e5c7e",
+            "version" : "1.3.0"
+          },
+          "name" : "sourceControlCheckout"
+        },
+        "subpath" : "swift-collections"
+      }
+    ],
+    "prebuilts" : [
+
+    ]
+  },
+  "version" : 7
+}
\ No newline at end of file
diff --git a/keyBoard/Class/AiTalk/V/Chat/KBChatTableView.h b/keyBoard/Class/AiTalk/V/Chat/KBChatTableView.h
index 8537fe8..2944651 100644
--- a/keyBoard/Class/AiTalk/V/Chat/KBChatTableView.h
+++ b/keyBoard/Class/AiTalk/V/Chat/KBChatTableView.h
@@ -24,6 +24,9 @@ NS_ASSUME_NONNULL_BEGIN
 
 @property (nonatomic, weak) id<KBChatTableViewDelegate> delegate;
 
+/// 是否倒置列表（倒置后：视觉底部为 row=0，历史消息向上追加）
+@property (nonatomic, assign) BOOL inverted;
+
 /// 添加用户消息
 - (void)addUserMessage:(NSString *)text;
 
@@ -84,6 +87,10 @@ NS_ASSUME_NONNULL_BEGIN
 - (void)prependHistoryMessages:(NSArray<KBAiChatMessage *> *)messages
                openingMessage:(nullable KBAiChatMessage *)openingMessage;
 
+/// 追加历史消息（倒置模式使用：把更老的消息插入到 openingMessage 之前/末尾）
+- (void)appendHistoryMessages:(NSArray<KBAiChatMessage *> *)messages
+              openingMessage:(nullable KBAiChatMessage *)openingMessage;
+
 @end
 
 NS_ASSUME_NONNULL_END
diff --git a/keyBoard/Class/AiTalk/V/Chat/KBChatTableView.m b/keyBoard/Class/AiTalk/V/Chat/KBChatTableView.m
index da7551b..3b22a42 100644
--- a/keyBoard/Class/AiTalk/V/Chat/KBChatTableView.m
+++ b/keyBoard/Class/AiTalk/V/Chat/KBChatTableView.m
@@ -127,6 +127,60 @@ static const NSTimeInterval kTimestampInterval = 5 * 60; // 5 分钟
 
 #pragma mark - Public Methods
 
+- (void)setInverted:(BOOL)inverted {
+    if (_inverted == inverted) {
+        return;
+    }
+    _inverted = inverted;
+    
+    self.tableView.transform = inverted ? CGAffineTransformMakeScale(1, -1) : CGAffineTransformIdentity;
+    [self updateContentBottomInset:self.contentBottomInset];
+    [self.tableView reloadData];
+    [self.tableView layoutIfNeeded];
+}
+
+static inline CGFloat KBChatAbsTimeInterval(NSTimeInterval interval) {
+    return interval < 0 ? -interval : interval;
+}
+
+- (BOOL)shouldInsertTimestampBetweenMessage:(KBAiChatMessage *)message
+                              andReference:(KBAiChatMessage *)reference {
+    if (!message.timestamp || !reference.timestamp) {
+        return YES;
+    }
+    
+    NSTimeInterval interval = KBChatAbsTimeInterval([message.timestamp timeIntervalSinceDate:reference.timestamp]);
+    if (interval >= kTimestampInterval) {
+        return YES;
+    }
+    
+    NSCalendar *calendar = [NSCalendar currentCalendar];
+    NSDateComponents *a = [calendar components:NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear
+                                      fromDate:reference.timestamp];
+    NSDateComponents *b = [calendar components:NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear
+                                      fromDate:message.timestamp];
+    return ![a isEqual:b];
+}
+
+- (NSInteger)firstNonTimeIndex {
+    for (NSInteger i = 0; i < self.messages.count; i++) {
+        if (self.messages[i].type != KBAiChatMessageTypeTime) {
+            return i;
+        }
+    }
+    return NSNotFound;
+}
+
+- (NSInteger)lastNonTimeIndexBeforeIndex:(NSInteger)index {
+    NSInteger maxIndex = MIN(index, self.messages.count);
+    for (NSInteger i = maxIndex - 1; i >= 0; i--) {
+        if (self.messages[i].type != KBAiChatMessageTypeTime) {
+            return i;
+        }
+    }
+    return NSNotFound;
+}
+
 - (void)addUserMessage:(NSString *)text {
     KBAiChatMessage *message = [KBAiChatMessage userMessageWithText:text];
     [self addMessage:message autoScroll:YES];
@@ -138,17 +192,31 @@ static const NSTimeInterval kTimestampInterval = 5 * 60; // 5 分钟
 }
 
 - (void)updateLastUserMessage:(NSString *)text {
-    for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
-        KBAiChatMessage *message = self.messages[i];
-        if (message.type == KBAiChatMessageTypeUser && message.isLoading) {
-            message.text = text;
-            message.isLoading = NO;
-            message.isComplete = YES;
-            
-            // 刷新该行
-            NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
-            [self.tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationNone];
-            return;
+    if (self.inverted) {
+        for (NSInteger i = 0; i < self.messages.count; i++) {
+            KBAiChatMessage *message = self.messages[i];
+            if (message.type == KBAiChatMessageTypeUser && message.isLoading) {
+                message.text = text;
+                message.isLoading = NO;
+                message.isComplete = YES;
+                
+                NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
+                [self.tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationNone];
+                return;
+            }
+        }
+    } else {
+        for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
+            KBAiChatMessage *message = self.messages[i];
+            if (message.type == KBAiChatMessageTypeUser && message.isLoading) {
+                message.text = text;
+                message.isLoading = NO;
+                message.isComplete = YES;
+                
+                NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
+                [self.tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationNone];
+                return;
+            }
         }
     }
 }
@@ -172,24 +240,44 @@ static const NSTimeInterval kTimestampInterval = 5 * 60; // 5 分钟
 
 - (void)updateLastAssistantMessage:(NSString *)text {
     // 查找最后一条未完成的 AI 消息
-    for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
-        KBAiChatMessage *message = self.messages[i];
-        if (message.type == KBAiChatMessageTypeAssistant && !message.isComplete) {
-            NSLog(@"[KBChatTableView] 更新最后一条 AI 消息 - 索引: %ld, 文本长度: %lu, needsTypewriter: %d", 
-                  (long)i, (unsigned long)text.length, message.needsTypewriterEffect);
-            message.text = text;
-            
-            // 直接更新 Cell 的文本，不刷新整个 Cell（避免打断打字机效果）
-            NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
-            KBChatAssistantMessageCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];
-            if ([cell isKindOfClass:[KBChatAssistantMessageCell class]]) {
-                NSLog(@"[KBChatTableView] 找到 Cell，直接配置消息");
-                // 直接调用 configureWithMessage，让 Cell 自己决定是否使用打字机效果
-                [cell configureWithMessage:message];
-            } else {
-                NSLog(@"[KBChatTableView] 未找到 Cell 或类型不匹配");
+    if (self.inverted) {
+        for (NSInteger i = 0; i < self.messages.count; i++) {
+            KBAiChatMessage *message = self.messages[i];
+            if (message.type == KBAiChatMessageTypeAssistant && !message.isComplete) {
+                NSLog(@"[KBChatTableView] 更新最后一条 AI 消息 - 索引: %ld, 文本长度: %lu, needsTypewriter: %d",
+                      (long)i, (unsigned long)text.length, message.needsTypewriterEffect);
+                message.text = text;
+                
+                NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
+                KBChatAssistantMessageCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];
+                if ([cell isKindOfClass:[KBChatAssistantMessageCell class]]) {
+                    NSLog(@"[KBChatTableView] 找到 Cell，直接配置消息");
+                    [cell configureWithMessage:message];
+                    cell.contentView.transform = self.inverted ? CGAffineTransformMakeScale(1, -1) : CGAffineTransformIdentity;
+                } else {
+                    NSLog(@"[KBChatTableView] 未找到 Cell 或类型不匹配");
+                }
+                return;
+            }
+        }
+    } else {
+        for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
+            KBAiChatMessage *message = self.messages[i];
+            if (message.type == KBAiChatMessageTypeAssistant && !message.isComplete) {
+                NSLog(@"[KBChatTableView] 更新最后一条 AI 消息 - 索引: %ld, 文本长度: %lu, needsTypewriter: %d", 
+                      (long)i, (unsigned long)text.length, message.needsTypewriterEffect);
+                message.text = text;
+                
+                NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
+                KBChatAssistantMessageCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];
+                if ([cell isKindOfClass:[KBChatAssistantMessageCell class]]) {
+                    NSLog(@"[KBChatTableView] 找到 Cell，直接配置消息");
+                    [cell configureWithMessage:message];
+                } else {
+                    NSLog(@"[KBChatTableView] 未找到 Cell 或类型不匹配");
+                }
+                return;
             }
-            return;
         }
     }
     
@@ -199,33 +287,63 @@ static const NSTimeInterval kTimestampInterval = 5 * 60; // 5 分钟
 }
 
 - (void)markLastAssistantMessageComplete {
-    for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
-        KBAiChatMessage *message = self.messages[i];
-        if (message.type == KBAiChatMessageTypeAssistant) {
-            NSLog(@"[KBChatTableView] 标记消息完成 - 索引: %ld, 文本: %@", (long)i, message.text);
-            message.isComplete = YES;
-            message.needsTypewriterEffect = NO; // 完成后不再需要打字机效果
-            
-            // 刷新 Cell 以显示完整文本
-            NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
-            [self.tableView reloadRowsAtIndexPaths:@[indexPath]
-                                  withRowAnimation:UITableViewRowAnimationNone];
-            return;
+    if (self.inverted) {
+        for (NSInteger i = 0; i < self.messages.count; i++) {
+            KBAiChatMessage *message = self.messages[i];
+            if (message.type == KBAiChatMessageTypeAssistant) {
+                NSLog(@"[KBChatTableView] 标记消息完成 - 索引: %ld, 文本: %@", (long)i, message.text);
+                message.isComplete = YES;
+                message.needsTypewriterEffect = NO;
+                
+                NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
+                [self.tableView reloadRowsAtIndexPaths:@[indexPath]
+                                      withRowAnimation:UITableViewRowAnimationNone];
+                return;
+            }
+        }
+    } else {
+        for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
+            KBAiChatMessage *message = self.messages[i];
+            if (message.type == KBAiChatMessageTypeAssistant) {
+                NSLog(@"[KBChatTableView] 标记消息完成 - 索引: %ld, 文本: %@", (long)i, message.text);
+                message.isComplete = YES;
+                message.needsTypewriterEffect = NO; // 完成后不再需要打字机效果
+                
+                NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
+                [self.tableView reloadRowsAtIndexPaths:@[indexPath]
+                                      withRowAnimation:UITableViewRowAnimationNone];
+                return;
+            }
         }
     }
 }
 
 - (void)markLastUserMessageLoadingComplete {
-    for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
-        KBAiChatMessage *message = self.messages[i];
-        if (message.type == KBAiChatMessageTypeUser) {
-            message.isLoading = NO;
-            NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
-            [self.tableView reloadRowsAtIndexPaths:@[indexPath]
-                                  withRowAnimation:UITableViewRowAnimationNone];
-            [self.tableView layoutIfNeeded];
-            [self scrollToBottomAnimated:NO];
-            return;
+    if (self.inverted) {
+        for (NSInteger i = 0; i < self.messages.count; i++) {
+            KBAiChatMessage *message = self.messages[i];
+            if (message.type == KBAiChatMessageTypeUser) {
+                message.isLoading = NO;
+                NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
+                [self.tableView reloadRowsAtIndexPaths:@[indexPath]
+                                      withRowAnimation:UITableViewRowAnimationNone];
+                [self.tableView layoutIfNeeded];
+                [self scrollToBottomAnimated:NO];
+                return;
+            }
+        }
+    } else {
+        for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
+            KBAiChatMessage *message = self.messages[i];
+            if (message.type == KBAiChatMessageTypeUser) {
+                message.isLoading = NO;
+                NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
+                [self.tableView reloadRowsAtIndexPaths:@[indexPath]
+                                      withRowAnimation:UITableViewRowAnimationNone];
+                [self.tableView layoutIfNeeded];
+                [self scrollToBottomAnimated:NO];
+                return;
+            }
         }
     }
 }
@@ -237,14 +355,41 @@ static const NSTimeInterval kTimestampInterval = 5 * 60; // 5 分钟
 }
 
 - (void)removeLoadingAssistantMessage {
-    for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
-        KBAiChatMessage *message = self.messages[i];
-        if (message.type == KBAiChatMessageTypeAssistant && message.isLoading) {
-            [self.messages removeObjectAtIndex:i];
-            NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
-            [self.tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationNone];
-            NSLog(@"[KBChatTableView] 移除 loading AI 消息，索引: %ld", (long)i);
-            break;
+    if (self.inverted) {
+        for (NSInteger i = 0; i < self.messages.count; i++) {
+            KBAiChatMessage *message = self.messages[i];
+            if (message.type == KBAiChatMessageTypeAssistant && message.isLoading) {
+                if (self.playingCellIndexPath) {
+                    if (self.playingCellIndexPath.row == i) {
+                        [self stopPlayingAudio];
+                    } else if (self.playingCellIndexPath.row > i) {
+                        self.playingCellIndexPath = [NSIndexPath indexPathForRow:self.playingCellIndexPath.row - 1 inSection:0];
+                    }
+                }
+                [self.messages removeObjectAtIndex:i];
+                NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
+                [self.tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationNone];
+                NSLog(@"[KBChatTableView] 移除 loading AI 消息，索引: %ld", (long)i);
+                break;
+            }
+        }
+    } else {
+        for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
+            KBAiChatMessage *message = self.messages[i];
+            if (message.type == KBAiChatMessageTypeAssistant && message.isLoading) {
+                if (self.playingCellIndexPath) {
+                    if (self.playingCellIndexPath.row == i) {
+                        [self stopPlayingAudio];
+                    } else if (self.playingCellIndexPath.row > i) {
+                        self.playingCellIndexPath = [NSIndexPath indexPathForRow:self.playingCellIndexPath.row - 1 inSection:0];
+                    }
+                }
+                [self.messages removeObjectAtIndex:i];
+                NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
+                [self.tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationNone];
+                NSLog(@"[KBChatTableView] 移除 loading AI 消息，索引: %ld", (long)i);
+                break;
+            }
         }
     }
 }
@@ -258,6 +403,12 @@ static const NSTimeInterval kTimestampInterval = 5 * 60; // 5 分钟
     
     // 关键修复：使用 layoutIfNeeded 确保布局完成后再滚动
     [self.tableView layoutIfNeeded];
+
+    if (self.inverted) {
+        CGFloat minOffsetY = -self.tableView.contentInset.top;
+        [self.tableView setContentOffset:CGPointMake(0, minOffsetY) animated:animated];
+        return;
+    }
     
     // 计算需要滚动到的位置
     CGFloat contentHeight = self.tableView.contentSize.height;
@@ -299,7 +450,11 @@ static const NSTimeInterval kTimestampInterval = 5 * 60; // 5 分钟
     
     // 直接设置 contentInset
     UIEdgeInsets insets = UIEdgeInsetsZero;
-    insets.bottom = bottomInset;
+    if (self.inverted) {
+        insets.top = bottomInset;
+    } else {
+        insets.bottom = bottomInset;
+    }
     self.tableView.contentInset = insets;
     self.tableView.scrollIndicatorInsets = insets;
     
@@ -319,22 +474,46 @@ static const NSTimeInterval kTimestampInterval = 5 * 60; // 5 分钟
     }
     
     NSInteger oldCount = self.messages.count;
-    [self insertMessageWithTimestamp:message];
+    NSArray<KBAiChatMessage *> *itemsToInsert = nil;
+    NSInteger insertIndex = oldCount;
+    
+    if (self.inverted) {
+        itemsToInsert = [self invertedItemsForNewMessageAtBeginning:message];
+        insertIndex = 0;
+        if (itemsToInsert.count > 0) {
+            NSIndexSet *set = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(insertIndex, itemsToInsert.count)];
+            [self.messages insertObjects:itemsToInsert atIndexes:set];
+        }
+    } else {
+        [self insertMessageWithTimestamp:message];
+        itemsToInsert = nil;
+        insertIndex = oldCount;
+    }
     
     NSInteger newCount = self.messages.count;
     NSInteger insertedCount = newCount - oldCount;
     
     if (insertedCount > 0) {
-        NSMutableArray *indexPaths = [NSMutableArray array];
-        for (NSInteger i = oldCount; i < newCount; i++) {
-            [indexPaths addObject:[NSIndexPath indexPathForRow:i inSection:0]];
+        if (self.inverted && self.playingCellIndexPath) {
+            self.playingCellIndexPath = [NSIndexPath indexPathForRow:self.playingCellIndexPath.row + insertedCount inSection:0];
+        }
+        
+        NSMutableArray *indexPaths = [NSMutableArray array];
+        if (self.inverted) {
+            for (NSInteger i = 0; i < insertedCount; i++) {
+                [indexPaths addObject:[NSIndexPath indexPathForRow:i inSection:0]];
+            }
+        } else {
+            for (NSInteger i = insertIndex; i < newCount; i++) {
+                [indexPaths addObject:[NSIndexPath indexPathForRow:i inSection:0]];
+            }
         }
         
-        // 关键修复：批量插入前先布局，避免高度计算不准确
         [self.tableView layoutIfNeeded];
         
-        [self.tableView insertRowsAtIndexPaths:indexPaths
-                              withRowAnimation:UITableViewRowAnimationNone];
+        [self.tableView beginUpdates];
+        [self.tableView insertRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationNone];
+        [self.tableView endUpdates];
     }
 
     [self updateFooterVisibility];
@@ -362,6 +541,9 @@ static const NSTimeInterval kTimestampInterval = 5 * 60; // 5 分钟
 - (void)reloadWithMessages:(NSArray<KBAiChatMessage *> *)messages
                 keepOffset:(BOOL)keepOffset
            scrollToBottom:(BOOL)scrollToBottom {
+    if (self.inverted) {
+        keepOffset = NO;
+    }
     CGFloat oldContentHeight = self.tableView.contentSize.height;
     CGFloat oldOffsetY = self.tableView.contentOffset.y;
     KBAiChatMessage *anchorMessage = nil;
@@ -400,8 +582,14 @@ static const NSTimeInterval kTimestampInterval = 5 * 60; // 5 分钟
     
     [self.messages removeAllObjects];
     if (messages.count > 0) {
-        for (KBAiChatMessage *message in messages) {
-            [self insertMessageWithTimestamp:message];
+        if (self.inverted) {
+            NSArray<KBAiChatMessage *> *rebuilt = [self invertedMessagesByInsertingTimestamps:messages
+                                                                             startingReference:nil];
+            [self.messages addObjectsFromArray:rebuilt];
+        } else {
+            for (KBAiChatMessage *message in messages) {
+                [self insertMessageWithTimestamp:message];
+            }
         }
     }
     
@@ -432,6 +620,9 @@ static const NSTimeInterval kTimestampInterval = 5 * 60; // 5 分钟
     NSLog(@"[KBChatTableView] ========== reloadWithMessages 结束 ==========");
     
     if (keepOffset) {
+        if (self.inverted) {
+            keepOffset = NO;
+        }
         CGFloat offsetY = oldOffsetY;
         if (anchorMessage) {
             NSInteger newIndex = [self.messages indexOfObjectIdenticalTo:anchorMessage];
@@ -480,6 +671,36 @@ static const NSTimeInterval kTimestampInterval = 5 * 60; // 5 分钟
     [self.messages addObject:message];
 }
 
+- (NSArray<KBAiChatMessage *> *)invertedItemsForNewMessageAtBeginning:(KBAiChatMessage *)message {
+    NSMutableArray<KBAiChatMessage *> *result = [NSMutableArray array];
+    NSInteger firstIndex = [self firstNonTimeIndex];
+    KBAiChatMessage *reference = (firstIndex != NSNotFound) ? self.messages[firstIndex] : nil;
+    
+    [result addObject:message];
+    if (!reference || [self shouldInsertTimestampBetweenMessage:message andReference:reference]) {
+        KBAiChatMessage *timeMessage = [KBAiChatMessage timeMessageWithTimestamp:message.timestamp];
+        [result addObject:timeMessage];
+    }
+    return result;
+}
+
+- (NSArray<KBAiChatMessage *> *)invertedMessagesByInsertingTimestamps:(NSArray<KBAiChatMessage *> *)messages
+                                                     startingReference:(nullable KBAiChatMessage *)reference {
+    NSMutableArray<KBAiChatMessage *> *result = [NSMutableArray array];
+    KBAiChatMessage *ref = reference;
+    for (KBAiChatMessage *msg in messages) {
+        if (ref && [self shouldInsertTimestampBetweenMessage:msg andReference:ref]) {
+            KBAiChatMessage *timeMessage = [KBAiChatMessage timeMessageWithTimestamp:msg.timestamp];
+            [result addObject:timeMessage];
+        } else if (!ref) {
+            // 第一条消息不强制插时间，避免底部多一条时间戳
+        }
+        [result addObject:msg];
+        ref = msg;
+    }
+    return result;
+}
+
 - (NSInteger)firstVisibleNonTimeRowExcludingMessage:(KBAiChatMessage *)excludedMessage {
     NSArray<NSIndexPath *> *visible = self.tableView.indexPathsForVisibleRows;
     if (visible.count == 0) { return NSNotFound; }
@@ -605,6 +826,48 @@ static const NSTimeInterval kTimestampInterval = 5 * 60; // 5 分钟
     }];
 }
 
+- (void)appendHistoryMessages:(NSArray<KBAiChatMessage *> *)messages
+              openingMessage:(nullable KBAiChatMessage *)openingMessage {
+    if (messages.count == 0) {
+        return;
+    }
+    
+    NSInteger insertIndex = self.messages.count;
+    if (openingMessage) {
+        NSInteger openingIndex = [self.messages indexOfObjectIdenticalTo:openingMessage];
+        if (openingIndex != NSNotFound) {
+            insertIndex = openingIndex;
+        }
+    }
+    
+    NSInteger referenceIndex = [self lastNonTimeIndexBeforeIndex:insertIndex];
+    KBAiChatMessage *reference = (referenceIndex != NSNotFound) ? self.messages[referenceIndex] : nil;
+    
+    NSArray<KBAiChatMessage *> *toInsert = nil;
+    if (self.inverted) {
+        toInsert = [self invertedMessagesByInsertingTimestamps:messages startingReference:reference];
+    } else {
+        toInsert = [self messagesByInsertingTimestamps:messages];
+    }
+    
+    [UIView performWithoutAnimation:^{
+        NSRange range = NSMakeRange(insertIndex, toInsert.count);
+        NSIndexSet *set = [NSIndexSet indexSetWithIndexesInRange:range];
+        [self.messages insertObjects:toInsert atIndexes:set];
+        
+        NSMutableArray<NSIndexPath *> *indexPaths = [NSMutableArray array];
+        for (NSInteger i = 0; i < toInsert.count; i++) {
+            [indexPaths addObject:[NSIndexPath indexPathForRow:insertIndex + i inSection:0]];
+        }
+        
+        [self.tableView beginUpdates];
+        [self.tableView insertRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationNone];
+        [self.tableView endUpdates];
+        
+        [self.tableView layoutIfNeeded];
+    }];
+}
+
 /// 判断是否需要插入时间戳
 - (BOOL)shouldInsertTimestampForMessage:(KBAiChatMessage *)message {
     // 第一条消息总是显示时间
@@ -659,19 +922,37 @@ static const NSTimeInterval kTimestampInterval = 5 * 60; // 5 分钟
 }
 
 - (void)stopPreviousIncompleteAssistantMessageIfNeeded {
-    for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
-        KBAiChatMessage *msg = self.messages[i];
-        if (msg.type == KBAiChatMessageTypeAssistant && !msg.isComplete) {
-            msg.isComplete = YES;
-            msg.needsTypewriterEffect = NO;
-            
-            NSIndexPath *oldIndexPath = [NSIndexPath indexPathForRow:i inSection:0];
-            KBChatAssistantMessageCell *oldCell = [self.tableView cellForRowAtIndexPath:oldIndexPath];
-            if ([oldCell isKindOfClass:[KBChatAssistantMessageCell class]]) {
-                [oldCell stopTypewriterEffect];
-                oldCell.messageLabel.text = msg.text;
+    if (self.inverted) {
+        for (NSInteger i = 0; i < self.messages.count; i++) {
+            KBAiChatMessage *msg = self.messages[i];
+            if (msg.type == KBAiChatMessageTypeAssistant && !msg.isComplete) {
+                msg.isComplete = YES;
+                msg.needsTypewriterEffect = NO;
+                
+                NSIndexPath *oldIndexPath = [NSIndexPath indexPathForRow:i inSection:0];
+                KBChatAssistantMessageCell *oldCell = [self.tableView cellForRowAtIndexPath:oldIndexPath];
+                if ([oldCell isKindOfClass:[KBChatAssistantMessageCell class]]) {
+                    [oldCell stopTypewriterEffect];
+                    oldCell.messageLabel.text = msg.text;
+                }
+                break;
+            }
+        }
+    } else {
+        for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
+            KBAiChatMessage *msg = self.messages[i];
+            if (msg.type == KBAiChatMessageTypeAssistant && !msg.isComplete) {
+                msg.isComplete = YES;
+                msg.needsTypewriterEffect = NO;
+                
+                NSIndexPath *oldIndexPath = [NSIndexPath indexPathForRow:i inSection:0];
+                KBChatAssistantMessageCell *oldCell = [self.tableView cellForRowAtIndexPath:oldIndexPath];
+                if ([oldCell isKindOfClass:[KBChatAssistantMessageCell class]]) {
+                    [oldCell stopTypewriterEffect];
+                    oldCell.messageLabel.text = msg.text;
+                }
+                break;
             }
-            break;
         }
     }
 }
@@ -700,6 +981,7 @@ static const NSTimeInterval kTimestampInterval = 5 * 60; // 5 分钟
             KBChatUserMessageCell *cell = [tableView dequeueReusableCellWithIdentifier:kUserCellIdentifier
                                                                           forIndexPath:indexPath];
             [cell configureWithMessage:message];
+            cell.contentView.transform = self.inverted ? CGAffineTransformMakeScale(1, -1) : CGAffineTransformIdentity;
             return cell;
         }
             
@@ -713,6 +995,7 @@ static const NSTimeInterval kTimestampInterval = 5 * 60; // 5 分钟
             BOOL isPlaying = [indexPath isEqual:self.playingCellIndexPath];
             [cell updateVoicePlayingState:isPlaying];
             
+            cell.contentView.transform = self.inverted ? CGAffineTransformMakeScale(1, -1) : CGAffineTransformIdentity;
             return cell;
         }
             
@@ -720,6 +1003,7 @@ static const NSTimeInterval kTimestampInterval = 5 * 60; // 5 分钟
             KBChatTimeCell *cell = [tableView dequeueReusableCellWithIdentifier:kTimeCellIdentifier
                                                                     forIndexPath:indexPath];
             [cell configureWithMessage:message];
+            cell.contentView.transform = self.inverted ? CGAffineTransformMakeScale(1, -1) : CGAffineTransformIdentity;
             return cell;
         }
     }
@@ -732,6 +1016,42 @@ static const NSTimeInterval kTimestampInterval = 5 * 60; // 5 分钟
 
 #pragma mark - UIScrollViewDelegate
 
+- (UICollectionView *)nearestCollectionView {
+    UIView *view = self;
+    while (view) {
+        if ([view isKindOfClass:[UICollectionView class]]) {
+            return (UICollectionView *)view;
+        }
+        view = view.superview;
+    }
+    return nil;
+}
+
+- (void)setNearestCollectionViewScrollEnabled:(BOOL)enabled {
+    UICollectionView *collectionView = [self nearestCollectionView];
+    if (!collectionView) {
+        return;
+    }
+    if (collectionView.scrollEnabled == enabled) {
+        return;
+    }
+    collectionView.scrollEnabled = enabled;
+}
+
+- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
+    [self setNearestCollectionViewScrollEnabled:NO];
+}
+
+- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
+    if (!decelerate) {
+        [self setNearestCollectionViewScrollEnabled:YES];
+    }
+}
+
+- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
+    [self setNearestCollectionViewScrollEnabled:YES];
+}
+
 - (void)scrollViewDidScroll:(UIScrollView *)scrollView {
     if ([self.delegate respondsToSelector:@selector(chatTableViewDidScroll:scrollView:)]) {
         [self.delegate chatTableViewDidScroll:self scrollView:scrollView];
@@ -743,23 +1063,18 @@ static const NSTimeInterval kTimestampInterval = 5 * 60; // 5 分钟
                      withVelocity:(CGPoint)velocity 
               targetContentOffset:(inout CGPoint *)targetContentOffset {
     
-    CGFloat offsetY = scrollView.contentOffset.y;
     CGFloat contentHeight = scrollView.contentSize.height;
     CGFloat scrollViewHeight = scrollView.bounds.size.height;
+    CGFloat minOffset = -scrollView.contentInset.top;
+    CGFloat maxOffset = contentHeight - scrollViewHeight + scrollView.contentInset.bottom;
+    if (maxOffset < minOffset) {
+        maxOffset = minOffset;
+    }
     
-    // 如果内容不够长，禁用弹簧效果
-    if (contentHeight <= scrollViewHeight) {
-        scrollView.bounces = NO;
-    } else {
-        scrollView.bounces = YES;
-        
-        // 在快速滑动到底部时，避免过度弹簧导致抖动
-        if (velocity.y < 0) { // 向上滑动（到底部）
-            CGFloat maxOffset = contentHeight - scrollViewHeight + scrollView.contentInset.bottom;
-            if (targetContentOffset->y > maxOffset) {
-                targetContentOffset->y = maxOffset;
-            }
-        }
+    if (targetContentOffset->y < minOffset) {
+        targetContentOffset->y = minOffset;
+    } else if (targetContentOffset->y > maxOffset) {
+        targetContentOffset->y = maxOffset;
     }
 }
 
diff --git a/keyBoard/Class/AiTalk/V/Chat/KBPersonaChatCell.m b/keyBoard/Class/AiTalk/V/Chat/KBPersonaChatCell.m
index 8d16fee..69091e7 100644
--- a/keyBoard/Class/AiTalk/V/Chat/KBPersonaChatCell.m
+++ b/keyBoard/Class/AiTalk/V/Chat/KBPersonaChatCell.m
@@ -260,7 +260,7 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
     __weak typeof(self) weakSelf = self;
     [self.aiVM fetchChatHistoryWithCompanionId:companionId
                                         pageNum:self.currentPage
-                                       pageSize:20
+                                       pageSize:10
                                      completion:^(KBChatHistoryPageModel *pageModel, NSError *error) {
         __strong typeof(weakSelf) strongSelf = weakSelf;
         if (!strongSelf) {
@@ -304,8 +304,8 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
             
             message.isComplete = YES;
             message.needsTypewriterEffect = NO;
-//            [newMessages addObject:message];
-            [newMessages insertObject:message atIndex:0];
+            [newMessages addObject:message];
+//            [newMessages insertObject:message atIndex:0];
         }
         
         // 插入历史消息（确保开场白始终是第一条）
@@ -317,12 +317,19 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
             strongSelf.messages = newMessages;
             [strongSelf ensureOpeningMessageAtTop];
         } else {
-            // 后续页，插入到开场白之后
+            // 后续页，继续加载历史
             [strongSelf ensureOpeningMessageAtTop];
             if (newMessages.count > 0) {
-                NSUInteger insertIndex = [strongSelf hasOpeningMessageAtTop] ? 1 : 0;
-                NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(insertIndex, newMessages.count)];
-                [strongSelf.messages insertObjects:newMessages atIndexes:indexSet];
+                if (strongSelf.chatView.inverted) {
+                    NSInteger openingIndex = [strongSelf openingMessageIndexInMessages];
+                    NSUInteger insertIndex = (openingIndex != NSNotFound) ? (NSUInteger)openingIndex : strongSelf.messages.count;
+                    NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(insertIndex, newMessages.count)];
+                    [strongSelf.messages insertObjects:newMessages atIndexes:indexSet];
+                } else {
+                    NSUInteger insertIndex = [strongSelf hasOpeningMessageAtTop] ? 1 : 0;
+                    NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(insertIndex, newMessages.count)];
+                    [strongSelf.messages insertObjects:newMessages atIndexes:indexSet];
+                }
             }
         }
         
@@ -335,10 +342,16 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
                                              keepOffset:NO
                                         scrollToBottom:YES];
             } else {
-                NSLog(@"[KBPersonaChatCell] 刷新 UI - loadedPage: %ld, prependHistory", 
-                      (long)loadedPage);
-                KBAiChatMessage *openingMessage = [strongSelf hasOpeningMessageAtTop] ? strongSelf.messages.firstObject : nil;
-                [strongSelf.chatView prependHistoryMessages:newMessages openingMessage:openingMessage];
+                if (strongSelf.chatView.inverted) {
+                    NSLog(@"[KBPersonaChatCell] 刷新 UI - loadedPage: %ld, appendHistory", (long)loadedPage);
+                    KBAiChatMessage *openingMessage = [strongSelf openingMessageInMessages];
+                    [strongSelf.chatView appendHistoryMessages:newMessages openingMessage:openingMessage];
+                } else {
+                    NSLog(@"[KBPersonaChatCell] 刷新 UI - loadedPage: %ld, prependHistory",
+                          (long)loadedPage);
+                    KBAiChatMessage *openingMessage = [strongSelf hasOpeningMessageAtTop] ? strongSelf.messages.firstObject : nil;
+                    [strongSelf.chatView prependHistoryMessages:newMessages openingMessage:openingMessage];
+                }
             }
             [strongSelf.chatView endLoadMoreWithHasMoreData:strongSelf.hasMoreHistory];
             
@@ -381,6 +394,9 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
     if (self.messages.count == 0) {
         return NO;
     }
+    if (self.chatView.inverted) {
+        return [self isOpeningMessage:self.messages.lastObject];
+    }
     return [self isOpeningMessage:self.messages.firstObject];
 }
 
@@ -409,7 +425,35 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
     KBAiChatMessage *openingMsg = [KBAiChatMessage assistantMessageWithText:introText];
     openingMsg.isComplete = YES;
     openingMsg.needsTypewriterEffect = NO;
-    [self.messages insertObject:openingMsg atIndex:0];
+    if (self.chatView.inverted) {
+        [self.messages addObject:openingMsg];
+    } else {
+        [self.messages insertObject:openingMsg atIndex:0];
+    }
+}
+
+- (nullable KBAiChatMessage *)openingMessageInMessages {
+    NSInteger index = [self openingMessageIndexInMessages];
+    if (index == NSNotFound) {
+        return nil;
+    }
+    return self.messages[index];
+}
+
+- (NSInteger)openingMessageIndexInMessages {
+    NSString *introText = self.persona.introText ?: @"";
+    if (introText.length == 0 || self.messages.count == 0) {
+        return NSNotFound;
+    }
+    
+    if (self.chatView.inverted) {
+        NSInteger lastIndex = self.messages.count - 1;
+        KBAiChatMessage *msg = self.messages[lastIndex];
+        return [self isOpeningMessage:msg] ? lastIndex : NSNotFound;
+    }
+    
+    KBAiChatMessage *first = self.messages.firstObject;
+    return [self isOpeningMessage:first] ? 0 : NSNotFound;
 }
 
 #pragma mark - 通知处理
@@ -454,7 +498,11 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
     
     [self ensureOpeningMessageAtTop];
     KBAiChatMessage *message = [KBAiChatMessage userMessageWithText:text];
-    [self.messages addObject:message];
+    if (self.chatView.inverted) {
+        [self.messages insertObject:message atIndex:0];
+    } else {
+        [self.messages addObject:message];
+    }
     [self.chatView addMessage:message autoScroll:YES];
 }
 
@@ -465,7 +513,11 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
     
     [self ensureOpeningMessageAtTop];
     KBAiChatMessage *message = [KBAiChatMessage loadingUserMessage];
-    [self.messages addObject:message];
+    if (self.chatView.inverted) {
+        [self.messages insertObject:message atIndex:0];
+    } else {
+        [self.messages addObject:message];
+    }
     [self.chatView addMessage:message autoScroll:YES];
 }
 
@@ -473,13 +525,25 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
     [self.chatView updateLastUserMessage:text];
     
     // 更新数据源中的消息
-    for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
-        KBAiChatMessage *message = self.messages[i];
-        if (message.type == KBAiChatMessageTypeUser && message.isLoading) {
-            message.text = text;
-            message.isLoading = NO;
-            message.isComplete = YES;
-            break;
+    if (self.chatView.inverted) {
+        for (NSInteger i = 0; i < self.messages.count; i++) {
+            KBAiChatMessage *message = self.messages[i];
+            if (message.type == KBAiChatMessageTypeUser && message.isLoading) {
+                message.text = text;
+                message.isLoading = NO;
+                message.isComplete = YES;
+                break;
+            }
+        }
+    } else {
+        for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
+            KBAiChatMessage *message = self.messages[i];
+            if (message.type == KBAiChatMessageTypeUser && message.isLoading) {
+                message.text = text;
+                message.isLoading = NO;
+                message.isComplete = YES;
+                break;
+            }
         }
     }
 }
@@ -488,11 +552,21 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
     [self.chatView markLastUserMessageLoadingComplete];
 
     // 同步更新数据源
-    for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
-        KBAiChatMessage *message = self.messages[i];
-        if (message.type == KBAiChatMessageTypeUser && message.isLoading) {
-            message.isLoading = NO;
-            break;
+    if (self.chatView.inverted) {
+        for (NSInteger i = 0; i < self.messages.count; i++) {
+            KBAiChatMessage *message = self.messages[i];
+            if (message.type == KBAiChatMessageTypeUser && message.isLoading) {
+                message.isLoading = NO;
+                break;
+            }
+        }
+    } else {
+        for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
+            KBAiChatMessage *message = self.messages[i];
+            if (message.type == KBAiChatMessageTypeUser && message.isLoading) {
+                message.isLoading = NO;
+                break;
+            }
         }
     }
 }
@@ -515,7 +589,11 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
     KBAiChatMessage *message = [KBAiChatMessage assistantMessageWithText:text
                                                                  audioId:audioId];
     message.needsTypewriterEffect = YES;
-    [self.messages addObject:message];
+    if (self.chatView.inverted) {
+        [self.messages insertObject:message atIndex:0];
+    } else {
+        [self.messages addObject:message];
+    }
     [self.chatView addMessage:message autoScroll:YES];
 }
 
@@ -527,18 +605,32 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
     
     [self ensureOpeningMessageAtTop];
     KBAiChatMessage *message = [KBAiChatMessage loadingAssistantMessage];
-    [self.messages addObject:message];
+    if (self.chatView.inverted) {
+        [self.messages insertObject:message atIndex:0];
+    } else {
+        [self.messages addObject:message];
+    }
     [self.chatView addMessage:message autoScroll:YES];
 }
 
 /// 移除 loading AI 消息
 - (void)removeLoadingAssistantMessage {
     // 从数据源中移除
-    for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
-        KBAiChatMessage *message = self.messages[i];
-        if (message.type == KBAiChatMessageTypeAssistant && message.isLoading) {
-            [self.messages removeObjectAtIndex:i];
-            break;
+    if (self.chatView.inverted) {
+        for (NSInteger i = 0; i < self.messages.count; i++) {
+            KBAiChatMessage *message = self.messages[i];
+            if (message.type == KBAiChatMessageTypeAssistant && message.isLoading) {
+                [self.messages removeObjectAtIndex:i];
+                break;
+            }
+        }
+    } else {
+        for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
+            KBAiChatMessage *message = self.messages[i];
+            if (message.type == KBAiChatMessageTypeAssistant && message.isLoading) {
+                [self.messages removeObjectAtIndex:i];
+                break;
+            }
         }
     }
     
@@ -556,7 +648,22 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
                     scrollView:(UIScrollView *)scrollView {
     CGFloat offsetY = scrollView.contentOffset.y;
     
-    // 下拉到顶部，加载历史消息
+    if (chatView.inverted) {
+        CGFloat contentHeight = scrollView.contentSize.height;
+        CGFloat scrollViewHeight = scrollView.bounds.size.height;
+        CGFloat maxOffsetY = contentHeight - scrollViewHeight + scrollView.contentInset.bottom;
+        if (maxOffsetY < 0) {
+            maxOffsetY = 0;
+        }
+        if (offsetY >= maxOffsetY - 50 && !self.isLoading && self.canTriggerLoadMore && self.hasMoreHistory) {
+            self.canTriggerLoadMore = NO;
+            [self loadMoreHistory];
+        } else if (offsetY < maxOffsetY - 100) {
+            self.canTriggerLoadMore = YES;
+        }
+        return;
+    }
+    
     if (offsetY <= 50 && !self.isLoading && self.canTriggerLoadMore && self.hasMoreHistory) {
         self.canTriggerLoadMore = NO;
         [self loadMoreHistory];
@@ -622,6 +729,7 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
     if (!_chatView) {
         _chatView = [[KBChatTableView alloc] init];
         _chatView.backgroundColor = [UIColor clearColor];
+        _chatView.inverted = YES;
         _chatView.delegate = self;
     }
     return _chatView;