A dark StyleSheet/Theme for TaskPaper 3 heavily inspired by @pslobo's excellent adaptation of Atom One Dark Syntax, which in turn I believe was heavily influenced by the now infamous 2006 Monokai theme for Textmate by Wimer Hazenberg.

• Fountain Blue for items tagged @next
• Malibu for URLs and Projects (gradually faded from Project levels 1-4)
• Soft Purple for items tagged @waiting
• Pistachio for items tagged @today, @active or @now (this is especially useful in conjunction with this great script by @complexpoint)
• Froly for items tagged @due
• Sunset for items tagged @flag, @high, @hot, @priority(high) or @prio(1)
• Whiskey for vanilla tags
• Chalky for context tags
• Mischka for text
• Bright Gray for selections
• Ebony for the background

• Done tasks are dimmed so as not to distract from what needs to be done
• Done tasks also mutes all other colours that may have been applied from previous tags
• Notes are dimmed, non-italiced and slightly smaller in relation to tasks.
• Tags are always dimmed in relation to task text.
• Saved searches are a very subdued tone so as not to distract from the main list
• Guide lines and item handles are slim, subdued and tinted a faded Malibu blue.
• Paragraph spacing before and after Project titles and within notes is enhanced for clean separation.

Move the Atom-One-Dark-Blue.less file to:

~/Library/Application Support/TaskPaper/Stylesheets

NOTE: From within TaskPaper you can open this folder location from the Window menu > StyleSheet > Open StyleSheet Folder.

Backup then replace the theme.less file located at:

~/Library/Application Support/TaskPaper/

NOTE: You can easily get to this folder location from the TaskPaper File menu > Open Application Folder. ALSO NOTE: You will need to change the name to theme.less to be recognised by TP versions earlier than 3.5

• continue to update as TaskPaper theme styles change or expand

• create colour variations (first might re-instate Pedro's favoured Orange project titles)

• add distinction between due and overdue?

• add paragraph spacing? @done

• add subtle variation to Priority levels @done

• style the Sidebar if this becomes possible (white is really jarring against a dark theme, so I recommend hiding it and the Toolbar most of the time). @done

2016-09-03:

• Commented out the custom font-family by default. [I'm enamored lately with San Francisco for prose (current TP default) and Hack for code.] You can easily insert your current favourite typeface on line 2 and remove //comment.
• reduced the multiple line height by .1 but still tighter than the default 1.3. Largely because...
• Notes Pro: added some more professional looking paragraph and line-spacing for notes, especially if they consist of multiple paragraphs. [Thanks @mylevelbest for bringing this to my attention].
• increased contrast of selection color back to One Dark default of 10% lighter than background. I like the mixing of text/background idea but it lends to some subtle difference between task/note selection color (especially in future theme variants!)
• Reduced opacity of guide-lines. Because...subtle :)

2016-08-29:

Updated to reflect new naming & location conventions in TP 3.5 Preview:

• updated README with new Installation instructions
• added the newly referenced 'Dark Mode' appearance for the Sidebar and Titlebar – Yay! crossed a most-desired one off the TODO list :)
• incorporated new 'prose-targeted' editor styles. (de-activated all but typewriter scrolling one though as it doesn't suit my purposes. Would make more sense with FoldingText. If any of these stick I imagine they would get toggled in actual in-app preference settings, in which case I'll re-enable all)

Other tweaks:

• named Atom-One-Dark-Blue in preparation for possible style variations.
• soft-coded Project level tints & collapsed Handle-colors to make future style variations easier to implement.
• added border-color to Collapsed and Filtered handles for consistent width.
• reduced handle-border-width so they are more subtle when expanded.
• brightened Caret color to be a bit more prevalent.

2016-05-26:

• added new handle styles from 3.3
• reduced the brightness of collapsed handles to project color as I think they stand out with the new style possibilities.
• matched filtered handle style to the default tag color (and improved the less syntax by consolidating under @tag-color)

2016-04-20:

Added new theme possibilities from 3.1 and 3.2:

• item-handle-size, guide-line width, paragraph-spacing-before(after)
• updated deprecated display label to content
• reintegrated additional Atom One Dark styles of syntax-saturation, syntax-brightness, mono-2

Other tweaks:

• swapped Project and Tag colors (not a fan of Orange, but true to Atom One Dark it is heavily used as a function or value color.)
• changed tint of guides and invisibles to malibu blue.
• found content uses for 2 unused colours.
• swapped a few other colours around to my personal preference.
• de-italiced and reduced font size of notes (slightly OmniFocus-like)
• further reduced fade of Search tag lines.
• Enlarged top Project title font size
• Expanded Project styles to 4 levels with gradually reducing color fade and type size.
• Added additional tag names to related functions (active, now, hot, priority, due)

2016-03-17:

• forked from @pslobo's excellent code heist!
• renamed the deprecated user.less filename to new theme.less
• updated the handle tints to be in line with TP3 release style of tinting dim when not collapsed.
• borrowed the cleaner handle idea from theme-notes-first to make them invisible when there are no sub-tasks or sub-notes. [UPDATE: now a TP3 default style!]