[HA 2025.5+] Theme contains removed "paper-*" CSS variables

[mathoudebine]

google_theme.yaml theme file contains several deprecated paper-* CSS variables that prevent the theme from rendering properly in HomeAssistant 2025.5+

From HomeAssistant 2025.5 release notes:
https://www.home-assistant.io/blog/2025/05/07/release-20255/#backward-incompatible-changes

Polymer Components Removed: Legacy Polymer-based components have been fully removed. As a result, all related paper-* CSS variables have also been removed.

• Some variables have been migrated to new theme tokens.
• Others were outdated and have been removed entirely.

✅ New tokens

--ha-font-family-body
--ha-font-family-heading
--ha-font-family-code
--ha-font-family-longform
--ha-font-size-scale
--ha-font-size-2xs
--ha-font-size-xs
--ha-font-size-s
--ha-font-size-m
--ha-font-size-l
--ha-font-size-xl
--ha-font-size-2xl
--ha-font-size-3xl
--ha-font-size-4xl
--ha-font-weight-light
--ha-font-weight-normal
--ha-font-weight-medium
--ha-font-weight-bold
--ha-font-weight-body
--ha-font-weight-heading
--ha-font-weight-action
--ha-line-height-condensed
--ha-line-height-normal
--ha-line-height-expanded
--ha-font-smoothing

❌ Removed tokens

--paper-font-common-nowrap_-_text-overflow
--paper-font-display1_-_letter-spacing
--paper-font-headline_-_letter-spacing
--paper-font-common-base_-_font-family
--paper-font-common-base_-_-webkit-font-smoothing
--paper-font-common-code_-_font-family
--paper-font-common-code_-_-webkit-font-smoothing
--paper-font-common-nowrap_-_white-space
--paper-font-common-nowrap_-_overflow
--paper-font-title_-_overflow
--paper-font-title_-_text-overflow
--paper-font-title_-_text-overflow
--paper-font-title_-_white-space
--paper-item-body-two-line-min-height
--paper-time-input-justify-content
--paper-item-body-three-line-min-height
--paper-item-icon-width
--paper-card-header-color
--paper-dialog-color
--paper-font-headline_-_white-space
--paper-font-headline_-_overflow
--paper-font-headline_-_text-overflow
--paper-font-subhead_-_white-space
--paper-font-subhead_-_overflow
--paper-font-subhead_-_text-overflow
--paper-item-icon-active-color
--paper-listbox-background-color

🔄 Migrated tokens

--code-font-family → --ha-font-family-code
--paper-font-title_-_-webkit-font-smoothing → --ha-font-smoothing
--paper-font-headline_-_-webkit-font-smoothing → --ha-font-smoothing
--paper-font-display1_-_-webkit-font-smoothing → --ha-font-smoothing
--paper-font-subhead_-_-webkit-font-smoothing → --ha-font-smoothing
--paper-font-body1_-_-webkit-font-smoothing → --ha-font-smoothing
--paper-font-display1_-_font-family → --ha-font-family-body
--paper-font-display1_-_font-size → --ha-font-size-4xl
--paper-font-display1_-_font-weight → --ha-font-weight-normal
--paper-font-display1_-_line-height → --ha-line-height-condensed
--paper-font-headline_-_font-family → --ha-font-family-body
--paper-font-headline_-_font-size → --ha-font-size-2xl
--paper-font-headline_-_font-weight → --ha-font-weight-normal
--paper-font-headline_-_line-height → --ha-line-height-condensed
--paper-font-title_-_font-family → --ha-font-family-body
--paper-font-title_-_font-size → --ha-font-size-xl
--paper-font-title_-_font-weight → --ha-font-weight-medium
--paper-font-title_-_line-height → --ha-line-height-normal
--paper-font-subhead_-_font-family → --ha-font-family-body
--paper-font-subhead_-_font-size → --ha-font-size-l
--paper-font-subhead_-_font-weight → --ha-font-weight-normal
--paper-font-subhead_-_line-height → --ha-line-height-normal
--paper-font-body1_-_font-family → --ha-font-family-body
--paper-font-body1_-_font-size → --ha-font-size-m
--paper-font-body1_-_font-weight → --ha-font-weight-normal
--paper-font-body1_-_line-height → --ha-line-height-normal
--paper-item-icon-color → --state-icon-color

[KameDomotics]

@mathoudebine were you able to modify and adapt the theme?

[mathoudebine]

No I switched to other themes, I don't have the knowledge to do it

[KameDomotics]

@JuanMTech
Would it be possible to update the theme? It's one of the most beautiful and I would be very sad not to be able to use it anymore.

[KameDomotics]

I am still new at this so I am not sure if this is appropriate. Full credit goes to @JuanMTech Juanmtech
If this is in any kind of violation, please message me, and I would remove it.
But with the help of AI, I took July 21 comment from @mathoudebine and modified the YAML
I was able to use the theme on HAOS (Core 2025.10.2, Supervisor 2025.10.0)

# Creator: Juan - @juanmtech
# Website: https://www.juanmtech.com
# YouTube Channel: https://youtube.com/juanmtech
# My Home Assistant Config files: https://github.com/JuanMTech/Home_Assistant_files
#
# UPDATED for Home Assistant 2025.5+ to remove legacy paper-* variables by Francis_Canada
#
Google Theme:
  modes:
    light:
      # Header:
      app-header-background-color: rgb(248, 248, 248)
      app-header-text-color: var(--primary-text-color)
      app-header-selection-bar-color: var(--primary-color)
      app-header-edit-background-color: rgb(178, 183, 190)
      # Main Interface Colors
      primary-color: rgb(26, 115, 232)
      primary-background-color: rgb(248, 248, 248)
      secondary-background-color: rgb(230, 230, 230)
      divider-color: var(--primary-background-color)
      accent-color: rgb(26, 115, 232)
      # Text
      primary-text-color: rgb(32, 33, 36)
      secondary-text-color: rgb(95, 99, 104)
      text-primary-color: var(--primary-text-color)
      disabled-text-color: rgba(95, 99, 104, 0.4)
      # Sidebar Menu
      sidebar-icon-color: rgb(95, 99, 104)
      sidebar-text-color: var(--sidebar-icon-color)
      sidebar-background-color: rgb(255, 255, 255)
      sidebar-selected-icon-color: rgb(26, 115, 232)
      sidebar-selected-text-color: var(--sidebar-selected-icon-color)
      # Buttons
      # REMOVED: paper-item-icon-color is migrated to state-icon-color
      # REMOVED: paper-item-icon-active-color is removed
      mdc-button-outline-color: rgb(26, 115, 232)
      # States and Badges
      state-icon-color: rgb(95, 99, 104) # MIGRATED from paper-item-icon-color
      state-icon-active-color: var(--primary-color) # UPDATED from paper-item-icon-active-color
      state-icon-unavailable-color: var(--disabled-text-color)
      # Sliders
      paper-slider-knob-color: rgb(26, 115, 232)
      paper-slider-knob-start-color: var(--paper-slider-knob-color)
      paper-slider-pin-color: var(--paper-slider-knob-color)
      paper-slider-active-color: var(--paper-slider-knob-color)
      paper-slider-secondary-color: var(--light-primary-color)
      # Labels
      label-badge-background-color: rgb(248, 250, 249)
      label-badge-text-color: var(--primary-text-color)
      label-badge-red: rgb(199, 72, 76)
      label-badge-green: rgb(109, 192, 113)
      label-badge-blue: rgb(26, 115, 232)
      label-badge-yellow: rgb(217, 183, 87)
      label-badge-gray: rgb(95, 98, 103)
      # Cards
      card-background-color: rgb(255, 255, 255)
      ha-card-background: rgb(255, 255, 255)
      ha-card-border-color: rgb(235, 235, 235)
      paper-dialog-background-color: var(--card-background-color)
      # REMOVED: paper-listbox-background-color is removed
      paper-card-background-color: var(--card-background-color)
      # Switches
      switch-checked-button-color: rgb(26, 115, 232)
      switch-checked-track-color: rgb(26, 115, 232)
      switch-unchecked-button-color: rgb(189, 193, 198)
      switch-unchecked-track-color: rgb(189, 193, 198)
      # Toggles
      paper-toggle-button-checked-button-color: var(--switch-checked-button-color)
      paper-toggle-button-checked-bar-color: var(--switch-checked-track-color)
      paper-toggle-button-unchecked-button-color: var(--switch-unchecked-button-color)
      paper-toggle-button-unchecked-bar-color: var(--switch-unchecked-track-color)
      # Table
      table-row-background-color: var(--card-background-color)
      table-row-alternative-background-color: var(--primary-background-color)
      data-table-background-color: var(--primary-background-color)
      # Dropdowns
      material-background-color: var(--card-background-color)
      material-secondary-background-color: var(--primary-background-color)
      mdc-theme-surface: var(--primary-background-color)
      # Pre/Code
      markdown-code-background-color: rgb(242, 242, 242)
      code-editor-background-color: rgb(242, 242, 242)
      # Checkboxes
      mdc-checkbox-unchecked-color: rgb(191, 191, 191)
      mdc-checkbox-disable-color: var(--disabled-text-color)
      mdc-select-fill-color: rgb(245, 245, 245)
      mdc-select-ink-color: var(--primary-text-color)
      mdc-select-label-ink-color: var(--secondary-text-color)
      mdc-select-idle-line-color: var(--primary-text-color)
      mdc-select-dropdown-icon-color: var(--secondary-text-color)
      mdc-select-hover-line-color: var(--accent-color)
      mdc-text-field-fill-color: var(--mdc-select-fill-color)
      # Input
      input-fill-color: var(--secondary-background-color)
      input-dropdown-icon-color: var(--secondary-text-color)
      input-ink-color: var(--primary-text-color)
      input-label-ink-color: var(--secondary-text-color)
      input-idle-line-color: var(--primary-text-color)
      input-hover-line-color: var(--accent-color)
      #RGB
      rgb-primary-text-color: 32, 33, 36
      rgb-primary-color: 32, 33, 36
      rgb-accent-color: 26, 115, 232
      rgb-state-switch-color: var(--rgb-accent-color)
      rgb-state-light-color: var(--rgb-accent-color)
      rgb-state-fan-color: var(--rgb-accent-color)
      rgb-state-script-color: var(--rgb-accent-color)
      rgb-state-vacuum-color: var(--rgb-accent-color)
      rgb-state-remote-color: var(--rgb-accent-color)
      rgb-state-input-boolean-color: var(--rgb-accent-color)
      rgb-state-humidifier-color: var(--rgb-accent-color)
      rgb-state-cover-color: var(--rgb-accent-color)
#
    dark:
      # Header:
      app-header-background-color: rgb(23, 23, 23)
      app-header-text-color: rgb(198, 203, 210)
      app-header-selection-bar-color: var(--primary-color)
      app-header-edit-background-color: rgb(136, 136, 136)
      # Main Interface Colors
      primary-color: rgb(138, 180, 248)
      primary-background-color: rgb(23, 23, 23)
      secondary-background-color: rgb(32, 33, 36)
      divider-color: var(--primary-background-color)
      accent-color: var(--primary-color)
      # Text
      primary-text-color: rgb(242, 242, 242)
      secondary-text-color: rgb(166, 166, 166)
      text-primary-color: var(--primary-text-color)
      disabled-text-color: rgba(184, 190, 199, 0.4)
      # Sidebar Menu
      sidebar-icon-color: rgb(169, 177, 188)
      sidebar-text-color: rgb(198, 203, 210)
      sidebar-background-color: rgb(32, 33, 36)
      sidebar-selected-icon-color: rgb(138, 180, 248)
      sidebar-selected-text-color: var(--sidebar-selected-icon-color)
      # Buttons
      # REMOVED: paper-item-icon-color is migrated to state-icon-color
      # REMOVED: paper-item-icon-active-color is removed
      mdc-button-outline-color: rgb(138, 180, 248)
      # States and Badges
      state-icon-color: rgb(169, 177, 188) # MIGRATED from paper-item-icon-color
      state-icon-active-color: rgb(138, 180, 248) # UPDATED from paper-item-icon-active-color
      state-icon-unavailable-color: var(--disabled-text-color)
      # Sliders
      paper-slider-knob-color: rgb(138, 180, 248)
      paper-slider-knob-start-color: var(--paper-slider-knob-color)
      paper-slider-pin-color: var(--paper-slider-knob-color)
      paper-slider-active-color: var(--paper-slider-knob-color)
      paper-slider-secondary-color: var(--light-primary-color)
      # Labels
      label-badge-background-color: var(--secondary-background-color)
      label-badge-text-color: var(--primary-text-color)
      label-badge-red: rgb(208, 101, 104)
      label-badge-green: rgb(128, 200, 132)
      label-badge-blue: rgb(138, 180, 248)
      label-badge-yellow: rgb(223, 194, 113)
      label-badge-gray: rgb(95, 98, 103)
      # Cards
      card-background-color: rgb(32, 33, 36)
      ha-card-background: rgb(32, 33, 36)
      ha-card-border-color: rgb(42, 43, 46)
      paper-dialog-background-color: var(--card-background-color)
      # REMOVED: paper-listbox-background-color is removed
      paper-card-background-color: var(--card-background-color)
      # Switches
      switch-checked-button-color: rgb(138, 180, 248)
      switch-checked-track-color: rgb(138, 180, 248)
      switch-unchecked-button-color: rgb(172, 176, 185)
      switch-unchecked-track-color: rgb(154, 160, 166)
      # Toggles
      paper-toggle-button-checked-button-color: var(--switch-checked-button-color)
      paper-toggle-button-checked-bar-color: var(--switch-checked-track-color)
      paper-toggle-button-unchecked-button-color: var(--switch-unchecked-button-color)
      paper-toggle-button-unchecked-bar-color: var(--switch-unchecked-track-color)
      # Table
      table-row-background-color: var(--primary-background-color)
      table-row-alternative-background-color: var(--secondary-background-color)
      data-table-background-color: var(--primary-background-color)
      # Dropdowns
      material-background-color: var(--table-row-background-color)
      material-secondary-background-color: var(--table-row-alternative-background-color)
      mdc-theme-surface: var(--secondary-background-color)
      # Pre/Code
      markdown-code-background-color: rgb(23, 23, 23)
      code-editor-background-color: rgb(23, 23, 23)
      # Checkboxes
      mdc-checkbox-unchecked-color: rgb(169, 177, 188)
      mdc-checkbox-disable-color: var(--disabled-text-color)
      mdc-select-fill-color: rgb(42, 43, 46)
      mdc-select-ink-color: var(--primary-text-color)
      mdc-select-label-ink-color: var(--secondary-text-color)
      mdc-select-idle-line-color: var(--primary-text-color)
      mdc-select-dropdown-icon-color: var(--secondary-text-color)
      mdc-select-hover-line-color: var(--accent-color)
      mdc-text-field-fill-color: var(--mdc-select-fill-color)
      # Input
      input-fill-color: var(--secondary-background-color)
      input-dropdown-icon-color: var(--secondary-text-color)
      input-ink-color: var(--primary-text-color)
      input-label-ink-color: var(--secondary-text-color)
      input-idle-line-color: var(--primary-text-color)
      input-hover-line-color: var(--accent-color)
      #RGB
      rgb-primary-text-color: 169, 177, 188
      rgb-primary-color: 169, 177, 188
      rgb-accent-color: 138, 180, 248
      rgb-state-switch-color: var(--rgb-accent-color)
      rgb-state-light-color: var(--rgb-accent-color)
      rgb-state-fan-color: var(--rgb-accent-color)
      rgb-state-script-color: var(--rgb-accent-color)
      rgb-state-vacuum-color: var(--rgb-accent-color)
      rgb-state-remote-color: var(--rgb-accent-color)
      rgb-state-input-boolean-color: var(--rgb-accent-color)
      rgb-state-humidifier-color: var(--rgb-accent-color)
      rgb-state-cover-color: var(--rgb-accent-color)

Thank you for your contribution.
Can you take a screenshot of this screen?
I saw the words "ALL YAML CONFIGURATION, AUTOMATIONS" etc etc in a different shade of blue, different from those in this screenshot

[KameDomotics]

It doesn't work completely, there are probably still several parts where the theme is not applied