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diff --git a/sundry/editor-syntax-etc/nvim/queries/sisu/highlights.scm b/sundry/editor-syntax-etc/nvim/queries/sisu/highlights.scm
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+; Syntax highlighting queries for SiSU Spine markup
+; Compatible with tree-sitter highlight capture names from
+; https://tree-sitter.github.io/tree-sitter/syntax-highlighting
+
+; =================================================================
+; Comments
+; =================================================================
+(version_comment) @comment.documentation
+(header_comment) @comment
+(body_comment) @comment
+
+; =================================================================
+; Header (document metadata)
+; =================================================================
+(header_field
+  key: (header_key) @keyword)
+
+(header_field
+  value: (header_value) @string)
+
+(header_continuation) @string
+
+; =================================================================
+; Headings
+; =================================================================
+(part_marker) @keyword.directive
+(segment_marker) @keyword.directive
+
+(heading_part
+  content: (heading_content) @markup.heading)
+
+(heading_segment
+  content: (heading_content) @markup.heading)
+
+(segment_name) @label
+(suppress_marker) @punctuation.special
+
+; Heading levels for more specific styling
+(heading_part
+  marker: (part_marker) @markup.heading.1
+  (#match? @markup.heading.1 "^:A~$"))
+
+(heading_part
+  marker: (part_marker) @markup.heading.2
+  (#match? @markup.heading.2 "^:B~$"))
+
+(heading_part
+  marker: (part_marker) @markup.heading.3
+  (#match? @markup.heading.3 "^:C~$"))
+
+(heading_part
+  marker: (part_marker) @markup.heading.4
+  (#match? @markup.heading.4 "^:D~$"))
+
+(heading_segment
+  marker: (segment_marker) @markup.heading.5
+  (#match? @markup.heading.5 "^1~$"))
+
+(heading_segment
+  marker: (segment_marker) @markup.heading.6
+  (#match? @markup.heading.6 "^2~$"))
+
+; =================================================================
+; Inline formatting
+; =================================================================
+(emphasis) @markup.italic
+(bold) @markup.bold
+(italic) @markup.italic
+(underline) @markup.underline
+(citation_mark) @markup.quote
+(superscript) @markup.superscript
+(subscript) @markup.subscript
+(inserted) @markup.underline
+(strikethrough) @markup.strikethrough
+(monospace_inline) @markup.raw
+
+; Formatting delimiters
+["*{" "}*"] @punctuation.special
+["!{" "}!"] @punctuation.special
+["/{" "}/"] @punctuation.special
+["_{" "}_"] @punctuation.special
+["\"{" "}\""] @punctuation.special
+["^{" "}^"] @punctuation.special
+[",{" "},"] @punctuation.special
+["+{" "}+"] @punctuation.special
+["-{" "}-"] @punctuation.special
+["#{" "}#"] @punctuation.special
+
+; =================================================================
+; Footnotes and editor notes
+; =================================================================
+(footnote) @markup.link
+(footnote_marker) @punctuation.special
+(editor_note) @markup.link
+
+["~{" "}~"] @punctuation.special
+; Editor-note channel selector: ~[* (asterisk set) or ~[+ (plus set).
+; A distinct capture lets themes colour the two channels separately
+; from the generic footnote delimiters above.
+(editor_note_marker) @attribute
+["]~"] @punctuation.special
+
+; =================================================================
+; Links and images
+; =================================================================
+(link
+  text: (link_text) @markup.link.label)
+
+(link
+  target: (url) @markup.link.url)
+
+(link
+  target: (anchor_ref) @markup.link.url)
+
+(link
+  target: (collection_path) @markup.link.url)
+
+(auto_footnote_marker) @punctuation.special
+
+(image
+  spec: (image_spec) @markup.link.label)
+
+(url) @markup.link.url
+
+(inline_anchor) @label
+(anchor_name) @label
+
+; =================================================================
+; Block elements
+; =================================================================
+(block_open) @keyword.directive
+(block_close) @keyword.directive
+(raw_content) @markup.raw
+
+; Code blocks get more specific highlighting
+(code_block_curly
+  open: (block_open) @keyword.directive)
+(code_block_curly
+  content: (raw_content) @markup.raw.block)
+(code_block_curly
+  close: (block_close) @keyword.directive)
+
+(code_block_tic
+  open: (block_open) @keyword.directive)
+(code_block_tic
+  content: (raw_content) @markup.raw.block)
+(code_block_tic
+  close: (block_close) @keyword.directive)
+
+; =================================================================
+; Book index
+; =================================================================
+(book_index) @markup.list
+(index_content) @string
+
+; =================================================================
+; Paragraph prefixes
+; =================================================================
+(paragraph_prefix) @punctuation.special
+
+; =================================================================
+; Special markers
+; =================================================================
+(ocn_suppress) @comment
+(ocn_suppress_open) @comment
+(ocn_suppress_close) @comment
+
+(page_break) @punctuation.special
+(horizontal_rule) @punctuation.special
+
+; =================================================================
+; Composite includes
+; =================================================================
+(composite_include) @keyword.import
+(include_path) @string.special.path
+
+; =================================================================
+; Pipe table
+; =================================================================
+(table_spec) @keyword.directive
+(table_row) @markup.raw
+
+; =================================================================
+; Text
+; =================================================================
+(text) @spell
+
+; Line break
+(line_break) @punctuation.special