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Six colour roles per design, per profile: surface, window surface, field interior, text, accent and separator line. A change applies at once in every open window and survives a restart once the settings are saved, like any other preference. Three sources, later wins role by role: the shipped stylesheet from the classpath, then the profile's own stylesheet file if there is one, then the overrides stored in the profile's preferences. resolvePalette is a pure function and reports where every role's colour came from, which the tab shows per field -- with two sources able to decide one colour, that is the only thing keeping "why is this colour what it is" answerable, and the spec calls it mandatory rather than decorative. Four things this had to get right, each learned the hard way and each pinned: A role is a selector and a property, not a property alone. Three of the six are stated outside .root -- text on .label, the separator on .separator *.line -- and -fx-background-color alone appears a dozen times in the evening sheet. Measured: the shipped daylight sheet states no colour at all, the evening sheet states five and implies the sixth. Kst4ContestTheme reads the palette from the store's state and not from remember. That read is what makes a change repaint every open window; remember(darkMode) held the palette until somebody toggled day/evening, so a change reached nothing. A derived colour follows its source's value, never its provenance. The root profile's own stylesheet is the one copyResourceIfRequired writes at every startup -- the shipped sheet itself -- so layer 2 declares the accent on every existing installation with nobody having chosen anything. Keying textAccent on "does this come from a file" repainted the evening accent from green to blue on upgrade and made "reset to shipped" disagree with "discard my changes". The contrast guard measures where colours are actually drawn, read off Theme.kt's Material mapping rather than off the role names: background and surface are both the window surface, and primary is textAccent, not accent. It reports a pair only when it is both under WCAG AA and worse than the shipped sheet -- the shipped sheets have three pairs under 4.5 themselves, so an absolute floor would warn on an untouched client and teach the operator to ignore warnings. The way back out of an unreadable palette is deliberately overbuilt, because it is the one failure that locks itself in. "Reset to the shipped colours" takes the shipped palette as a required parameter and reads no composition local, so there is no path by which it could be drawn in the colours it exists to undo; it looks out of place under a customised palette, and that is what makes it findable. Ctrl+Z, Ctrl+D and Ctrl+R reach the three ways back even with the caret in a colour field. A mistyped colour is refused and the field snaps back. The profile's stylesheet is the hand-editing route the copy under ~/.praktiKST has been promising since it was first written and never read. It is read now. A button writes the shipped template as a starting point and never replaces a file that is already there. An unreadable, truncated or non-CSS file does not prevent startup -- the role falls back to the shipped design. A sheet stating -fx-base and no -fx-background states the derived window surface too, the way JavaFX does, or the most natural hand edit would leave every window the shipped light grey. 101 new tests. All of it runs headless.