# Changelog

All notable changes to the Celestia beamer theme are documented in this file.

## [1.2.8] - 2026-08-30

### Fixed
- Passing `standout` in the theme options crashed every document with
  `Extra \endgroup` at the end of the first frame: it raised the
  frame-level flag whose matching `\begingroup` is only opened by the
  `standout` frame option. `standout` is a frame option only.

## [1.2.7] - 2026-08-28

### Added
- New named colors `blockbackground`, `examplebackground` and
  `alertbackground`: the exact interior background of the three block
  families, computed from the active block style (and its opacity options)

### Fixed
- `mathfaceoptions` is applied again for the unicode-math faces (`pagella`,
  `termes`, `stix`, `libertinus`, `fira` and custom font names):
  unicode-math's `\setmathfont` does not expand macros in its options
  argument and silently dropped the whole list; the theme now expands the
  options before the call.
- The `Scale=MatchLowercase` default is restored for the unicode-math
  faces. Since 1.2.2 the `Ligatures=TeX` declaration used
  `\defaultfontfeatures`, which replaces the default feature set and wiped
  the `Scale=MatchLowercase` declared earlier, so math fonts loaded after
  it came out unscaled; it now uses `\defaultfontfeatures+` and appends.

## [1.2.6] - 2026-08-23

### Fixed
- Math digits, operators, delimiters, punctuation, capital Greek and math
  accents now use the selected math face (`mathface=iwona` by default, also
  `kurier`) under LuaLaTeX/XeLaTeX instead of Computer Modern, and `\mathrm`
  no longer silently falls back to the serif text font. Cause: at
  `\begin{document}` fontspec runs its own maths setup, re-pointing those
  symbols to an internal OT1/cmr `legacymaths` font and re-declaring
  `operators`, which overrode the theme's preamble configuration. Fix, in
  three layers: (1) the theme now passes fontspec its documented `no-math`
  option when `mathface` is `iwona` or `kurier`, so fontspec leaves maths
  alone at the source; (2) the iwona/kurier setup is deferred to
  `\AtBeginDocument` and re-points `legacymaths` when it exists, which keeps
  the fix effective even when the user loads fontspec before the theme
  (where `no-math` cannot take effect); (3) `\mathtt` is mapped explicitly
  to the document monospaced font on every engine, preserving its previous
  rendering under LuaLaTeX/XeLaTeX (which `no-math` alone would have
  reverted to cmtt) and replacing the historical cmtt fallback under
  pdfLaTeX, so all three engines now produce the same math font set. The
  rest of the pdfLaTeX output is unchanged (it was already correct), and
  the other `mathface` values are unaffected.

## [1.2.5] - 2026-07-15

### Fixed
- Figure captions are centered again. The global `\captionsetup` forced
  `justification=raggedright` with `singlelinecheck=false`, which left every
  caption flush left even when it fit on a single line; it now uses
  `justification=centering`. The `lstlisting`/`listing` code-caption headers
  keep their left alignment.
- Italic text (`\emph`, `\textit`) renders in a true italic under
  LuaLaTeX/XeLaTeX again. When the theme forces `UprightFont={Inter Light}`
  (the default `light`/`semibold` combination) fontspec stopped auto-detecting
  the italic face and fell back to the upright shape; the `Inter Light Italic`
  and `Inter SemiBold Italic` faces are now declared explicitly on those
  branches.

## [1.2.4] - 2026-05-25

### Added
- Conditional handling of the `clean` frametitle: the left vertical bar now
  follows the value of `frametitlepadding` horizontally when provided.

### Changed
- Visual tuning of the `clean`, `plainrule` and `subtle` frametitle templates
  (better default vertical spacing, tighter coupling between subtitle and the
  decorative rule, scope-safe coordinate handling for the `clean` bar).

## [1.2.3] - 2026-05-15

### Added
- Support for Beamer overlay specifications (`<2->`, `<3->`, etc.) on the
  theorem-like environments (`definition`, `theorem`, `example`, `remark`,
  `property`, …). Standard Beamer syntax:
  `\begin{definition}<2->[title=…] … \end{definition}`.
- New `frametitlepadding=<dim>` and `frametitlebottomskip=<dim>` options to
  fine-tune the height of the frame title for every frametitle style.
- Documentation: dedicated section listing the named colors exposed globally
  by the theme and usable directly in TikZ (`background`, `main`, `accent`,
  `blockcolor`, `examplecolor`, `alertcolor`, `emphasis`, `decoration`).

### Fixed
- Numbering of theorem-like environments no longer increments at every
  overlay of the same frame (`\resetcounteronoverlays` is now applied to
  every counter created by the theme). Applies both to the new `<2->`
  syntax and to plain `\pause`.

## [1.2.2] - 2026-03-21

### Changed
- The `light` option now also applies to the monospaced font and to a
  user-supplied sans face: under LuaLaTeX/XeLaTeX the theme appends
  `UprightFeatures={Weight=300}` to `sansfaceoptions` and
  `monofaceoptions`, so variable fonts render in a light weight too.

### Fixed
- Loading of the Inter static styles is now guarded with
  `\IfFontExistsTF`: `Inter Light` and `Inter SemiBold` are only requested
  when actually installed, instead of aborting the compilation on systems
  that ship only the base Inter family.
- Standard TeX ligatures (`--`, `---`, quote substitution) are declared as
  a default font feature under LuaLaTeX/XeLaTeX
  (`\defaultfontfeatures{Ligatures=TeX}`).

## [1.2.1] - 2026-03-15

### Changed
- New out-of-the-box look: the default palette is `nordic` (was
  `lumiere`), the default block style `sober` (was `fullbar`), the default
  footer `info` (was `prestige`) and the default frame title `subtle` (was
  `plainrule`).
- Flatter rendering: theorem-like environments and the `box`, `macos` and
  `bar` code styles no longer carry a drop shadow (`no shadow` replaces
  `drop fuzzy shadow`).
- The `info` footer uses slightly wider side margins (2 em instead of
  1.5 em) for the author/title group and the frame counter.

## [1.2.0] - 2026-02-22

### Added
- `style=<name>` option with twelve preset styles (`academic`, `chalk`,
  `design`, `editorial`, `executive`, `lumiere`, `minimal`, `modern`,
  `signature`, `simple`, `sober`, `studio`), each bundling a palette, a
  frame title style, a footer style and a block style. Replaces the
  `scheme` option of 1.1.x.
- New footer designs for `footerstyle`: `prestige` (default), `info`,
  `badge`, `classic`, `cosmic`, `minimalist`, `ruled`, `framed`, `boxed`
  and `boxedruled`, alongside `fullbar` and `fraction`. The 1.1.x values
  `default`, `quartercircle`, `number` and `shadedfullbar` are gone.
- New frame title styles: `plainrule` (default), `clean`, `subtle`,
  `line`, `leftbar`, `gradient` and `cosmic`, alongside `elegant` and
  `plain`; `centered`, `plaincentered` and `shaded` are gone.
- Single `block=<style>` option selecting the block design: `fullbar`
  (default), `bar`, `sober`, `soft`, `shaded`, `noback`, `plain`,
  `native`, `native-shadow`, `native-default`. Replaces the `soberblock`,
  `softblock`, `shadedblock` and `nobackblock` keys. New
  `barblockopacity` option (default `0.05`).
- `codestyle=<name>` option for code blocks: `bar` (default), `frame`,
  `box` and `macos` (window frame with traffic-light dots). The
  `nocodebox` option is removed (`codebox` remains).
- `progressbar` option: progress bar at the bottom of every slide,
  natively integrated in the `info` and `minimalist` footers, overlaid on
  the page for the other styles.
- `emphasis` and `decoration` options choosing which palette color
  (`main` or `accent`) drives headings/items and rules/ornaments.
- Extended family of theorem-like environments: `property`, `properties`,
  `definitions`, `examples`, `remarks`, `method`, `activity`,
  `activities`, `application` and `applications` join `theorem`, `lemma`,
  `proposition`, `corollary`, `definition`, `example` and `remark`.
  Titles follow the `language` option (English/French); with a
  `block=native…` style they degrade to standard Beamer blocks.
- `quiz` environment with a `\correct` item command for multiple-choice
  questions; correct answers are highlighted on the second overlay.
- `\cverb` command for the styled inline verbatim.
- `mathface` and `mathfaceoptions` options; the math setup defaults to
  the Iwona font.
- `semibold` and `light` options (both enabled by default): bold text
  maps to a semibold weight and the sans body face to Inter Light.
- Half-step size commands (`\largeLarge`, `\LargeLARGE`, `\LARGEhuge`, …)
  usable in the size options; new `footertextsize` (default `tiny`) and
  `blocktitleweight` (default `bfseries`) options.
- `\twocolumntoc` command for a two-column table of contents; the
  corresponding option is renamed from `twocolumntoc` to `twocoltoc`.
- `\subject` now stores its argument (exposed as `\insertsubject`) in
  addition to setting the PDF subject metadata.

### Changed
- Palette collection rebuilt around 22 palettes: `chalk`, `dusk`,
  `horizon`, `imperial`, `lumiere`, `manuscript`, `mineral`, `obsidian`,
  `oxford`, `palatial`, `petrol`, `prestige`, `sapphire`, `steel`,
  `terracotta`, `velours` and `velvet` are new; `copper`, `midnight`,
  `nordic`, `royal` and `sakura` are kept; the other 1.1.x palettes are
  removed. The default palette is `lumiere`.
- Font setup rebuilt: `mainface` is renamed `serifface`; the default
  monospaced font is IBM Plex Mono (`plex-mono`, was Roboto Mono); the
  same defaults apply to pdfLaTeX through the `inter`, `literata` and
  `plex-mono` packages; missing fonts fall back to TeX Gyre faces with a
  warning; the theme now uses `\usefonttheme{professionalfonts}`.
- Default `titlealign` is now `left` (was `center`); default sizes
  retuned (`titlesize=LargeLARGE`, `frametitlesize=normalsize`).
- The TikZ background decoration system is removed (`decorative`,
  `nodecorative`, `decorationstyle` and `decorationopacity` options).
- The theme no longer overrides `\verb`, `\texttt` and
  `\lstinputlisting`; use `\cverb` for the themed inline verbatim.
- Code listing captions are labeled "Programme" in French documents.

## [1.1.1] - 2025-11-02

### Fixed
- `tikz`, `tcolorbox` and `multicol` are now loaded unconditionally.
  Previously `tikz` was only loaded when decorations were enabled and
  `tcolorbox` only with `codebox`, so option combinations such as
  `decorationstyle=none` with `nocodebox` failed with undefined control
  sequences (the theorem environments and several templates rely on
  them).
- XeLaTeX now loads the packaged `sourceserifpro`, `sourcesanspro` and
  `roboto-mono` fonts, as pdfLaTeX does, instead of probing system fonts;
  the previous probing code could wrongly replace the main font when the
  sans fallback was triggered (`\setmainfont` instead of
  `\setsansfont`).

## [1.1.0] - 2025-11-02

### Added
- Color palette system: 28 predefined palettes selectable with
  `palette=<name>` (`amber`, `coral`, `emerald`, `lavender`, `midnight`,
  `modern`, `nordic`, `ocean`, `sunset`, `twilight`, …; default
  `midnight`), plus `custompalette={main,accent,block,example,alert,
  background}` to define all six colors at once.
- `scheme=<name>` presets (`light`, `academic`, `creative`, `zen`,
  `simple`) configuring decoration style, footer, frame title and block
  style in one option; explicitly passed options keep priority.
- `footerstyle=<name>` option replacing the `nofooter`,
  `quartercirclefooter` and `fullbarfooter` booleans; values `default`,
  `quartercircle`, `fullbar` and the new `shadedfullbar`, `number` and
  `fraction` designs.
- `titlealign=left|center|right` option (default `center`) replacing the
  `centeredtitle` and `titleright` booleans.
- `titlebackground=<file>` option: full-page image behind the title page
  (rendered at 15 % opacity).
- Configurable decorations: `decorationstyle=none|sober|fancy|minimal`
  (default `none`) and `decorationopacity=<0-1>` (default `0.2`).
- New block styles `shadedblock` and `nobackblock` alongside `soberblock`
  and `softblock`, a `defaultblock` key to restore the standard style,
  and per-style opacity options `shadedblockopacity` (default `0.35`),
  `soberblockopacity` and `softblockopacity` (default `0.18`).
- `sectionpage` (default `true`) and `sectionnumber` (default `false`)
  options controlling automatic section pages and section numbering.
- `codehandler=listings|minted` option: source code can now be handled by
  `minted`, framed in the same `tcolorbox` decor as `listings`.
- Theorem-like environments rebuilt on `tcolorbox`: `theorem`, `lemma`,
  `proposition`, `corollary`, `definition`, `example` and `remark`, with
  automatic numbering, translated titles and a key-value interface
  (`title=`, `label=`, plus any tcolorbox key such as `colback` or
  `colframe`).
- Size options `titlesize`, `frametitlesize`, `sectiontitlesize` and
  `subtitlesize` (defaults `Large`, `large`, `LARGE`, `Large`).
- New `shaded` frame title style (title on a shaded colored background).
- `\verb` is redefined as a styled inline verbatim (colored,
  `listings`-based).

### Changed
- Default colors now come from the `midnight` palette (`maincolor`
  `0A1F3C`, `accentcolor` `B38600`, …) instead of fixed option defaults;
  the individual color options still override the palette.
- The theme no longer redefines `\alert`; Beamer's standard alerted-text
  handling applies.

## [1.0.7] - 2025-10-18

### Changed
- Blocks (`block`, `exampleblock`, `alertblock`) now get 0.5 em of
  vertical space before and after, and the default block style no longer
  uses Beamer's rounded corners.
- The decorative rule on the title page is thinner (0.5 pt whatever the
  `headweight`) and shorter for left-aligned layouts (35 % of the line
  width instead of 95 %).

### Fixed
- The vertical spacing below the frame title (all four styles) now
  handles the `nofooter` case on its own instead of only inside
  `quartercirclefooter`, fixing the title height when footers are
  disabled.

## [1.0.6] - 2025-09-13

### Changed
- Maintenance release: the default `maincolor` is darkened from `2C3E50`
  to `1e293b`.

## [1.0.5] - 2025-08-31

### Changed
- The block color options are renamed: `mainblue`, `maingreen` and
  `mainred` become `blockcolor` (default `1A3B52`), `examplecolor`
  (default `1A5228`) and `alertcolor` (default `52281A`); the internal
  color names used by `\mathterm`, `\mathdef` and the URL color follow.
- Default `maincolor` changed from `045549` to `2C3E50`.
- The `unicolor` option now covers the whole theme: subtitle, institute
  and date on the title page, every block style (default, `soberblock`,
  `softblock`) and the standout blocks all derive from `main` when it is
  set. The `\setblockopacity` helper is removed.

### Fixed
- A typo (`\celestia@headwight`) prevented the `headweight` option from
  being honored when drawing the title-page rule; the rule now matches
  the chosen weight and its color follows `unicolor`.

## [1.0.4] - 2025-07-20

### Fixed
- In the footline templates, the short title (a hyperlink to the title
  page) is printed in the footer text color instead of the hyperlink
  color (`\hypersetup{linkcolor=.}`).

## [1.0.3] - 2025-07-01

### Added
- `boldurl` option: URLs are typeset in bold (`\UrlFont`).

### Changed
- Colored table of contents: section entries (number and title) use
  `main`, subsection entries use the accent color, with matching
  hyperlink colors.
- Section pages now display the title `\LARGE` in `main`; subsection
  pages display the subsection title `\Large` in the accent color.
- `colorlinks=true` is set explicitly in `\hypersetup`.
- pdfLaTeX: Roboto Mono is loaded scaled to 0.9 to better match the text
  fonts.

## [1.0.2] - 2025-06-10

### Added
- `shownavigation` option: Beamer's navigation symbols (hidden by
  default) can be displayed, recolored to match the theme and integrated
  into every footer style, including a dedicated `plain with nav`
  footline for plain frames when footers are disabled.
- Themed `button` and `button border` colors (switched to the accent
  color on standout frames).

### Changed
- Section pages: the decorative background is rebuilt with randomly
  placed shaded spheres and stars around a central sphere, replacing the
  fixed circles; the halo behind the section title is retuned.
- The decorative circles of the title page now use the `main` color
  instead of `accent`.

## [1.0.1] - 2025-05-24

### Added
- `language=<name>` option (default `english`) passed to `babel`, which
  is now only loaded when the document has not loaded it already (it was
  previously required unconditionally and without options).
- XeLaTeX support: fonts are configured through `fontspec` as with
  LuaLaTeX.
- Additional font fallbacks: when Source Serif Pro, Source Sans Pro or
  Source Code Pro are not installed, TeX Gyre Termes, TeX Gyre Heros or
  Latin Modern Mono are used instead of failing.
- Bibliography styling: dedicated colors for bibliography entries
  (author, title, location, note), and with `biblatex` the bibliography
  heading now sets a frame title.

## [1.0.0] - 2025-01-08

Initial release.

- Modern Beamer theme for academic and professional presentations, with a
  configurable color system (`maincolor`, `accentcolor`, `mainblue`,
  `maingreen`, `mainred`, `backgroundcolor`) and font options
  (`mainface`, `sansface`, `monoface`; Literata, Inter and Roboto Mono by
  default) for LuaLaTeX and pdfLaTeX.
- Four frame title styles (`elegant`, `centered`, `plain`,
  `plaincentered`), footer variants (`quartercirclefooter`,
  `fullbarfooter`, `nofooter`), standout frames and decorative title and
  section pages.
- Block styles (`soberblock`, `softblock`), `tcolorbox`-framed code
  listings, compact and two-column table of contents options.