diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 9bc6d83220737b..941645e4eac6f5 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -45,7 +45,6 @@ jobs:
             os: macos-14
           - test_task: check
             os: macos-15
-            extra_checks: [capi]
       fail-fast: false
 
     env:
diff --git a/box.c b/box.c
index 0ea74182849269..e2c8f25eda7375 100644
--- a/box.c
+++ b/box.c
@@ -1047,9 +1047,8 @@ rb_f_dump_classext(VALUE recv, VALUE klass)
 /*
  *  Document-class: Ruby::Box
  *
- *  Ruby::Box is designed to provide separated spaces in a Ruby
- *  process, to isolate applications and libraries.
- *  See {Ruby::Box}[rdoc-ref:box.md].
+ *  :markup: markdown
+ *  :include: doc/_box.md
  */
 void
 Init_Box(void)
@@ -1057,7 +1056,7 @@ Init_Box(void)
     tmp_dir = system_tmpdir();
     tmp_dir_has_dirsep = (strcmp(tmp_dir + (strlen(tmp_dir) - strlen(DIRSEP)), DIRSEP) == 0);
 
-    VALUE mRuby = rb_path2class("Ruby");
+    VALUE mRuby = rb_define_module("Ruby");
 
     rb_cBox = rb_define_class_under(mRuby, "Box", rb_cModule);
     rb_define_method(rb_cBox, "initialize", box_initialize, 0);
diff --git a/doc/.document b/doc/.document
index 6e6caa83336322..1feb6934ec358f 100644
--- a/doc/.document
+++ b/doc/.document
@@ -1,5 +1,5 @@
-*.md
-*.rb
+[^_]*.md
+[^_]*.rb
 [^_]*.rdoc
 contributing
 NEWS
diff --git a/doc/box.md b/doc/_box.md
similarity index 100%
rename from doc/box.md
rename to doc/_box.md
diff --git a/doc/date/calendars.rdoc b/doc/date/calendars.rdoc
index 4e6fd8334bda50..a2540f1c433b5a 100644
--- a/doc/date/calendars.rdoc
+++ b/doc/date/calendars.rdoc
@@ -31,7 +31,7 @@ See also {a concrete example here}[rdoc-ref:DateTime@When+should+you+use+DateTim
 === Argument +start+
 
 Certain methods in class \Date handle differences in the
-{Julian and Gregorian calendars}[rdoc-ref:date/calendars.rdoc@Julian+and+Gregorian+Calendars]
+{Julian and Gregorian calendars}[rdoc-ref:@Julian+and+Gregorian+Calendars]
 by accepting an optional argument +start+, whose value may be:
 
 - Date::ITALY (the default): the created date is Julian
diff --git a/doc/encodings.rdoc b/doc/encodings.rdoc
index bd87c38e9e7df1..ee7f224f2ba550 100644
--- a/doc/encodings.rdoc
+++ b/doc/encodings.rdoc
@@ -138,7 +138,7 @@ A Ruby String object has an encoding that is an instance of class \Encoding.
 The encoding may be retrieved by method String#encoding.
 
 The default encoding for a string literal is the script encoding;
-see {Script Encoding}[rdoc-ref:encodings.rdoc@Script+Encoding].
+see {Script Encoding}[rdoc-ref:@Script+Encoding].
 
   's'.encoding # => #<Encoding:UTF-8>
 
@@ -147,7 +147,7 @@ The default encoding for a string created with method String.new is:
 - For no argument, ASCII-8BIT.
 - For a \String object argument, the encoding of that string.
 - For a string literal, the script encoding;
-  see {Script Encoding}[rdoc-ref:encodings.rdoc@Script+Encoding].
+  see {Script Encoding}[rdoc-ref:@Script+Encoding].
 
 In either case, any encoding may be specified:
 
@@ -193,7 +193,7 @@ The default encoding for these, however, is:
 
 - US-ASCII, if all characters are US-ASCII.
 - The script encoding, otherwise;
-  see (Script Encoding)[rdoc-ref:encodings.rdoc@Script+Encoding].
+  see (Script Encoding)[rdoc-ref:@Script+Encoding].
 
 == Filesystem \Encoding
 
diff --git a/doc/format_specifications.rdoc b/doc/format_specifications.rdoc
index a2755256df3994..a59f2103775ec8 100644
--- a/doc/format_specifications.rdoc
+++ b/doc/format_specifications.rdoc
@@ -46,42 +46,42 @@ The links lead to the details and examples.
 === \Integer Type Specifiers
 
 - +b+ or +B+: Format +argument+ as a binary integer.
-  See {Specifiers b and B}[rdoc-ref:format_specifications.rdoc@Specifiers+b+and+B].
+  See {Specifiers b and B}[rdoc-ref:@Specifiers+b+and+B].
 - +d+, +i+, or +u+ (all are identical):
   Format +argument+ as a decimal integer.
-  See {Specifier d}[rdoc-ref:format_specifications.rdoc@Specifier+d].
+  See {Specifier d}[rdoc-ref:@Specifier+d].
 - +o+: Format +argument+ as an octal integer.
-  See {Specifier o}[rdoc-ref:format_specifications.rdoc@Specifier+o].
+  See {Specifier o}[rdoc-ref:@Specifier+o].
 - +x+ or +X+: Format +argument+ as a hexadecimal integer.
-  See {Specifiers x and X}[rdoc-ref:format_specifications.rdoc@Specifiers+x+and+X].
+  See {Specifiers x and X}[rdoc-ref:@Specifiers+x+and+X].
 
 === Floating-Point Type Specifiers
 
 - +a+ or +A+: Format +argument+ as hexadecimal floating-point number.
-  See {Specifiers a and A}[rdoc-ref:format_specifications.rdoc@Specifiers+a+and+A].
+  See {Specifiers a and A}[rdoc-ref:@Specifiers+a+and+A].
 - +e+ or +E+: Format +argument+ in scientific notation.
-  See {Specifiers e and E}[rdoc-ref:format_specifications.rdoc@Specifiers+e+and+E].
+  See {Specifiers e and E}[rdoc-ref:@Specifiers+e+and+E].
 - +f+: Format +argument+ as a decimal floating-point number.
-  See {Specifier f}[rdoc-ref:format_specifications.rdoc@Specifier+f].
+  See {Specifier f}[rdoc-ref:@Specifier+f].
 - +g+ or +G+: Format +argument+ in a "general" format.
-  See {Specifiers g and G}[rdoc-ref:format_specifications.rdoc@Specifiers+g+and+G].
+  See {Specifiers g and G}[rdoc-ref:@Specifiers+g+and+G].
 
 === Other Type Specifiers
 
 - +c+: Format +argument+ as a character.
-  See {Specifier c}[rdoc-ref:format_specifications.rdoc@Specifier+c].
+  See {Specifier c}[rdoc-ref:@Specifier+c].
 - +p+: Format +argument+ as a string via <tt>argument.inspect</tt>.
-  See {Specifier p}[rdoc-ref:format_specifications.rdoc@Specifier+p].
+  See {Specifier p}[rdoc-ref:@Specifier+p].
 - +s+: Format +argument+ as a string via <tt>argument.to_s</tt>.
-  See {Specifier s}[rdoc-ref:format_specifications.rdoc@Specifier+s].
+  See {Specifier s}[rdoc-ref:@Specifier+s].
 - <tt>%</tt>: Format +argument+ (<tt>'%'</tt>) as a single percent character.
-  See {Specifier %}[rdoc-ref:format_specifications.rdoc@Specifier+-25].
+  See {Specifier %}[rdoc-ref:@Specifier+-25].
 
 == Flags
 
 The effect of a flag may vary greatly among type specifiers.
 These remarks are general in nature.
-See {type-specific details}[rdoc-ref:format_specifications.rdoc@Type+Specifier+Details+and+Examples].
+See {type-specific details}[rdoc-ref:@Type+Specifier+Details+and+Examples].
 
 Multiple flags may be given with single type specifier;
 order does not matter.
diff --git a/doc/packed_data.rdoc b/doc/packed_data.rdoc
index b33eed58e7e47c..3a2c8a57a5f0ed 100644
--- a/doc/packed_data.rdoc
+++ b/doc/packed_data.rdoc
@@ -159,7 +159,7 @@ Any directive may be followed by either of these modifiers:
     'AB'.unpack('C3')   # => [65, 66, nil]
 
   Note: Directives in <tt>%w[A a Z m]</tt> use +count+ differently;
-  see {String Directives}[rdoc-ref:packed_data.rdoc@String+Directives].
+  see {String Directives}[rdoc-ref:@String+Directives].
 
 If elements don't fit the provided directive, only least significant bits are encoded:
 
diff --git a/doc/ruby/options.md b/doc/ruby/options.md
index 943b5f967bf86e..ee6b2054bc1e80 100644
--- a/doc/ruby/options.md
+++ b/doc/ruby/options.md
@@ -68,15 +68,15 @@ nil
 
 See also:
 
-- {Option -a}[rdoc-ref:ruby/options.md@a-3A+Split+Input+Lines+into+Fields]:
+- {Option -a}[rdoc-ref:@a-3A+Split+Input+Lines+into+Fields]:
   Split input lines into fields.
-- {Option -F}[rdoc-ref:ruby/options.md@F-3A+Set+Input+Field+Separator]:
+- {Option -F}[rdoc-ref:@F-3A+Set+Input+Field+Separator]:
   Set input field separator.
-- {Option -l}[rdoc-ref:ruby/options.md@l-3A+Set+Output+Record+Separator-3B+Chop+Lines]:
+- {Option -l}[rdoc-ref:@l-3A+Set+Output+Record+Separator-3B+Chop+Lines]:
   Set output record separator; chop lines.
-- {Option -n}[rdoc-ref:ruby/options.md@n-3A+Run+Program+in+gets+Loop]:
+- {Option -n}[rdoc-ref:@n-3A+Run+Program+in+gets+Loop]:
   Run program in `gets` loop.
-- {Option -p}[rdoc-ref:ruby/options.md@p-3A+-n-2C+with+Printing]:
+- {Option -p}[rdoc-ref:@p-3A+-n-2C+with+Printing]:
   `-n`, with printing.
 
 ### `-a`: Split Input Lines into Fields
@@ -98,15 +98,15 @@ and the default field separator  is `$;`.
 
 See also:
 
-- {Option -0}[rdoc-ref:ruby/options.md@0-3A+Set+-24-2F+-28Input+Record+Separator-29]:
+- {Option -0}[rdoc-ref:@0-3A+Set+-24-2F+-28Input+Record+Separator-29]:
   Set `$/` (input record separator).
-- {Option -F}[rdoc-ref:ruby/options.md@F-3A+Set+Input+Field+Separator]:
+- {Option -F}[rdoc-ref:@F-3A+Set+Input+Field+Separator]:
   Set input field separator.
-- {Option -l}[rdoc-ref:ruby/options.md@l-3A+Set+Output+Record+Separator-3B+Chop+Lines]:
+- {Option -l}[rdoc-ref:@l-3A+Set+Output+Record+Separator-3B+Chop+Lines]:
   Set output record separator; chop lines.
-- {Option -n}[rdoc-ref:ruby/options.md@n-3A+Run+Program+in+gets+Loop]:
+- {Option -n}[rdoc-ref:@n-3A+Run+Program+in+gets+Loop]:
   Run program in `gets` loop.
-- {Option -p}[rdoc-ref:ruby/options.md@p-3A+-n-2C+with+Printing]:
+- {Option -p}[rdoc-ref:@p-3A+-n-2C+with+Printing]:
   `-n`, with printing.
 
 ### `-c`: Check Syntax
@@ -228,15 +228,15 @@ The argument must immediately follow the option
 
 See also:
 
-- {Option -0}[rdoc-ref:ruby/options.md@0-3A+Set+-24-2F+-28Input+Record+Separator-29]:
+- {Option -0}[rdoc-ref:@0-3A+Set+-24-2F+-28Input+Record+Separator-29]:
   Set `$/` (input record separator).
-- {Option -a}[rdoc-ref:ruby/options.md@a-3A+Split+Input+Lines+into+Fields]:
+- {Option -a}[rdoc-ref:@a-3A+Split+Input+Lines+into+Fields]:
   Split input lines into fields.
-- {Option -l}[rdoc-ref:ruby/options.md@l-3A+Set+Output+Record+Separator-3B+Chop+Lines]:
+- {Option -l}[rdoc-ref:@l-3A+Set+Output+Record+Separator-3B+Chop+Lines]:
   Set output record separator; chop lines.
-- {Option -n}[rdoc-ref:ruby/options.md@n-3A+Run+Program+in+gets+Loop]:
+- {Option -n}[rdoc-ref:@n-3A+Run+Program+in+gets+Loop]:
   Run program in `gets` loop.
-- {Option -p}[rdoc-ref:ruby/options.md@p-3A+-n-2C+with+Printing]:
+- {Option -p}[rdoc-ref:@p-3A+-n-2C+with+Printing]:
   `-n`, with printing.
 
 ### `-h`: Print Short Help Message
@@ -314,15 +314,15 @@ $ ruby -ln -e 'p $_' desiderata.txt
 
 See also:
 
-- {Option -0}[rdoc-ref:ruby/options.md@0-3A+Set+-24-2F+-28Input+Record+Separator-29]:
+- {Option -0}[rdoc-ref:@0-3A+Set+-24-2F+-28Input+Record+Separator-29]:
   Set `$/` (input record separator).
-- {Option -a}[rdoc-ref:ruby/options.md@a-3A+Split+Input+Lines+into+Fields]:
+- {Option -a}[rdoc-ref:@a-3A+Split+Input+Lines+into+Fields]:
   Split input lines into fields.
-- {Option -F}[rdoc-ref:ruby/options.md@F-3A+Set+Input+Field+Separator]:
+- {Option -F}[rdoc-ref:@F-3A+Set+Input+Field+Separator]:
   Set input field separator.
-- {Option -n}[rdoc-ref:ruby/options.md@n-3A+Run+Program+in+gets+Loop]:
+- {Option -n}[rdoc-ref:@n-3A+Run+Program+in+gets+Loop]:
   Run program in `gets` loop.
-- {Option -p}[rdoc-ref:ruby/options.md@p-3A+-n-2C+with+Printing]:
+- {Option -p}[rdoc-ref:@p-3A+-n-2C+with+Printing]:
   `-n`, with printing.
 
 ### `-n`: Run Program in `gets` Loop
@@ -348,15 +348,15 @@ be on good terms with all persons.
 
 See also:
 
-- {Option -0}[rdoc-ref:ruby/options.md@0-3A+Set+-24-2F+-28Input+Record+Separator-29]:
+- {Option -0}[rdoc-ref:@0-3A+Set+-24-2F+-28Input+Record+Separator-29]:
   Set `$/` (input record separator).
-- {Option -a}[rdoc-ref:ruby/options.md@a-3A+Split+Input+Lines+into+Fields]:
+- {Option -a}[rdoc-ref:@a-3A+Split+Input+Lines+into+Fields]:
   Split input lines into fields.
-- {Option -F}[rdoc-ref:ruby/options.md@F-3A+Set+Input+Field+Separator]:
+- {Option -F}[rdoc-ref:@F-3A+Set+Input+Field+Separator]:
   Set input field separator.
-- {Option -l}[rdoc-ref:ruby/options.md@l-3A+Set+Output+Record+Separator-3B+Chop+Lines]:
+- {Option -l}[rdoc-ref:@l-3A+Set+Output+Record+Separator-3B+Chop+Lines]:
   Set output record separator; chop lines.
-- {Option -p}[rdoc-ref:ruby/options.md@p-3A+-n-2C+with+Printing]:
+- {Option -p}[rdoc-ref:@p-3A+-n-2C+with+Printing]:
   `-n`, with printing.
 
 ### `-p`: `-n`, with Printing
@@ -377,15 +377,15 @@ be on good terms with all persons.
 
 See also:
 
-- {Option -0}[rdoc-ref:ruby/options.md@0-3A+Set+-24-2F+-28Input+Record+Separator-29]:
+- {Option -0}[rdoc-ref:@0-3A+Set+-24-2F+-28Input+Record+Separator-29]:
   Set `$/` (input record separator).
-- {Option -a}[rdoc-ref:ruby/options.md@a-3A+Split+Input+Lines+into+Fields]:
+- {Option -a}[rdoc-ref:@a-3A+Split+Input+Lines+into+Fields]:
   Split input lines into fields.
-- {Option -F}[rdoc-ref:ruby/options.md@F-3A+Set+Input+Field+Separator]:
+- {Option -F}[rdoc-ref:@F-3A+Set+Input+Field+Separator]:
   Set input field separator.
-- {Option -l}[rdoc-ref:ruby/options.md@l-3A+Set+Output+Record+Separator-3B+Chop+Lines]:
+- {Option -l}[rdoc-ref:@l-3A+Set+Output+Record+Separator-3B+Chop+Lines]:
   Set output record separator; chop lines.
-- {Option -n}[rdoc-ref:ruby/options.md@n-3A+Run+Program+in+gets+Loop]:
+- {Option -n}[rdoc-ref:@n-3A+Run+Program+in+gets+Loop]:
   Run program in `gets` loop.
 
 ### `-r`: Require Library
@@ -434,7 +434,7 @@ $ ruby -s t.rb -foo=baz -bar=bat
 ```
 
 The option may not be used with
-{option -e}[rdoc-ref:ruby/options.md@e-3A+Execute+Given+Ruby+Code]
+{option -e}[rdoc-ref:@e-3A+Execute+Given+Ruby+Code]
 
 ### `-S`: Search Directories in `ENV['PATH']`
 
@@ -583,7 +583,7 @@ ruby - Copyright (C) 1993-2024 Yukihiro Matsumoto
 ### `--debug`: Alias for `-d`
 
 Option `--debug` is an alias for
-{option -d}[rdoc-ref:ruby/options.md@d-3A+Set+-24DEBUG+to+true].
+{option -d}[rdoc-ref:@d-3A+Set+-24DEBUG+to+true].
 
 ### `--disable`: Disable Features
 
@@ -617,9 +617,9 @@ option was given:
 - `--dump=help`:
   Same as {option \-\-help}[options_md.html#label--help-3A+Print+Help+Message].
 - `--dump=syntax`:
-  Same as {option -c}[rdoc-ref:ruby/options.md@c-3A+Check+Syntax].
+  Same as {option -c}[rdoc-ref:@c-3A+Check+Syntax].
 - `--dump=usage`:
-  Same as {option -h}[rdoc-ref:ruby/options.md@h-3A+Print+Short+Help+Message].
+  Same as {option -h}[rdoc-ref:@h-3A+Print+Short+Help+Message].
 - `--dump=version`:
   Same as {option \-\-version}[options_md.html#label--version-3A+Print+Ruby+Version].
 
@@ -641,7 +641,7 @@ see {option --disable}[options_md.html#label--disable-3A+Disable+Features].
 ### `--encoding`: Alias for `-E`.
 
 Option `--encoding` is an alias for
-{option -E}[rdoc-ref:ruby/options.md@E-3A+Set+Default+Encodings].
+{option -E}[rdoc-ref:@E-3A+Set+Default+Encodings].
 
 ### `--external-encoding`: Set Default External \Encoding
 
diff --git a/doc/strftime_formatting.rdoc b/doc/strftime_formatting.rdoc
index 5c7b33155df9ec..bef343c3073a83 100644
--- a/doc/strftime_formatting.rdoc
+++ b/doc/strftime_formatting.rdoc
@@ -136,7 +136,7 @@ the only required part is the conversion specifier, so we begin with that.
     t = Time.now       # => 2022-06-29 07:10:20.3230914 -0500
     t.strftime('%N')   # => "323091400"                  # Default.
 
-  Use {width specifiers}[rdoc-ref:strftime_formatting.rdoc@Width+Specifiers]
+  Use {width specifiers}[rdoc-ref:@Width+Specifiers]
   to adjust units:
 
       t.strftime('%3N')  # => "323"                      # Milliseconds.
@@ -522,6 +522,5 @@ An ISO 8601 combined date and time representation may be any
 ISO 8601 date and any ISO 8601 time,
 separated by the letter +T+.
 
-For the relevant +strftime+ formats, see
-{Dates}[rdoc-ref:strftime_formatting.rdoc@Dates]
-and {Times}[rdoc-ref:strftime_formatting.rdoc@Times] above.
+For the relevant +strftime+ formats, see {Dates}[rdoc-ref:@Dates] and
+{Times}[rdoc-ref:@Times] above.
diff --git a/doc/syntax/assignment.rdoc b/doc/syntax/assignment.rdoc
index 68d4ae97be8698..9d91bd92dc00df 100644
--- a/doc/syntax/assignment.rdoc
+++ b/doc/syntax/assignment.rdoc
@@ -9,7 +9,7 @@ Assignment creates a local variable if the variable was not previously
 referenced.
 
 An assignment expression result is always the assigned value, including
-{assignment methods}[rdoc-ref:syntax/assignment.rdoc@Assignment+Methods].
+{assignment methods}[rdoc-ref:@Assignment+Methods].
 
 == Local Variable Names
 
diff --git a/version.c b/version.c
index 366ba1b2b5c6b7..c9a219fb1385c1 100644
--- a/version.c
+++ b/version.c
@@ -132,7 +132,7 @@ Init_version(void)
      * The constants defined here are aliased in the toplevel with
      * +RUBY_+ prefix.
      */
-    VALUE mRuby = rb_path2class("Ruby");
+    VALUE mRuby = rb_define_module("Ruby");
 
     enum {ruby_patchlevel = RUBY_PATCHLEVEL};
     VALUE version = MKSTR(version);