nx_css_tokenize.nx

nx_css_tokenize.nx -- CSS tokenizer for the Nishi browser. Phase 2 (CSS subset) of docs/NISHI_BROWSER_ROADMAP.md. Recognises the subset andelinwest.com + ide.html + most modern hand-written CSS uses: tag selectors `body`, `div`, `h1` class selectors `.head`, `.menu-item` id selectors `#main`, `#sidebar` descendant combinator (whitespace between simple selectors) property:value `color: red`, `font-size: 16px` hex colors `#ff0000`, `#fff` number+unit `16px`, `1.5em`, `100%` quoted strings `"Arial"`, `'sans-serif'` block delimiters `{ ... }` statement separator `;` selector list `,` between selectors What it does NOT handle yet (named Phase 2b improvements): - @-rules (@media, @keyframes, @import, @font-face) - pseudo-classes (:hover, :nth-child) - pseudo-elements (::before, ::after) - attribute selectors ([href^="https"]) - sibling/child combinators (+ ~ >) - calc() / var() / CSS variables - URL functions - escape sequences inside identifiers - block comments / and / asterisk Subset is sufficient for Phase 2 demo: parse a sovereign-served stylesheet, build a selector -> declarations map, apply to the DOM tree from nx_html_tokenizer. Per cardinal `feedback-honest-perf-verdict-no-aspirational-claims`: gap list is EXACT and lives in this header. genealogy_id: w3c_css_syntax_module_level_3 + whatwg_css_tokenizer + substrate_browser_phase_2_seed lineage_id: nishi_browser_css_tokenize_v1 nx_safety_envelope: intended_use: "CSS tokenizer -- browser front-end style apply"