:root{--bg: #111;--fg: #fff;--muted: #a0a0a0;--tile: #1f1f1f;--line: #555;--num: #333;--op: #3B82F6;--op-hover: #60A5FA;--op-pressed: #2563EB;--op-focus: rgba(147, 197, 253, .4);--util: #3a3a3a;--ok: #22C55E;--warning: #F59E0B;--err: #EF4444;--accent: #3B82F6;--gap: 20px;--slot-min: 200px;--digitKey: #171B22;--digitKeyActive: #222733;--digitText: #556070;--font-serif: "Latin Modern Roman", "Computer Modern", "STIX Two Text", Georgia, "Times New Roman", Times, serif;--font-mono: "Latin Modern Mono", "Computer Modern Typewriter", "JetBrains Mono", ui-monospace, Menlo, monospace;--font-sans: ui-sans-serif, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, 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