Private/Get-DhCssGreyLight.ps1

function Get-DhCssGreyLight {
    <#
    .SYNOPSIS Returns the :root variable block for the GreyLight theme.
               Called by Get-DhThemeCss which appends the shared structural CSS.
    #>

    return @'
:root {
  /* GreyLight — Neutral warm grey palette, blue-grey steel accent
     No strong colour bias — professional, print-friendly feel */

  --bg-page: #EEEEEE;
  --bg-header: #455A64;
  --bg-surface: #F5F5F5;
  --bg-table: #FAFAFA;
  --bg-row-alt: #F0F0F0;
  --bg-row-hover: #E3E9ED;
  --bg-row-sel: #CFD8DC;
  --bg-thead: #E0E0E0;

  --accent-primary: #546E7A;
  --accent-secondary: #37474F;
  --accent-danger: #C62828;
  --accent-warn: #E65100;
  --accent-ok: #2E7D32;

  --export-csv-bg: #E8F5E9; --export-csv-fg: #2E7D32; --export-csv-bdr: #C8E6C9;
  --export-xlsx-bg: #E8F5E9; --export-xlsx-fg: #388E3C; --export-xlsx-bdr: #C8E6C9;
  --export-pdf-bg: #FEECE9; --export-pdf-fg: #C62828; --export-pdf-bdr: #FFCDD2;

  --text-primary: #263238;
  --text-secondary: #546E7A;
  --text-muted: #90A4AE;
  --text-accent: #37474F;
  --text-invert: #FFFFFF;

  --border-subtle: #E0E0E0;
  --border-medium: #BDBDBD;
  --border-strong: #546E7A55;

  --font-ui: 'Segoe UI', 'SF Pro Text', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Cascadia Code', 'Consolas', monospace;
  --font-display: 'Segoe UI', 'SF Pro Display', system-ui, -apple-system, sans-serif;

  --size-xs: 0.75rem;
  --size-sm: 0.85rem;
  --size-base: 0.9375rem;
  --size-md: 1.05rem;
  --size-lg: 1.30rem;
  --size-xl: 1.65rem;

  --weight-normal: 400;
  --weight-medium: 500;
  --weight-bold: 700;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 36px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --trans-fast: 150ms ease;
  --trans-normal: 250ms ease;

  --row-height: 40px;
  --header-height: 76px;
  --nav-height: 44px;

  --shadow-md: 0 2px 8px rgba(0,0,0,0.12);
  --shadow-glow: 0 0 12px rgba(84,110,122,0.16);

  --cell-ok-fg: #2E7D32; --cell-ok-bg: rgba(46,125,50,0.08);
  --cell-warn-fg: #BF360C; --cell-warn-bg: rgba(191,54,12,0.08);
  --cell-danger-fg: #B71C1C; --cell-danger-bg: rgba(183,28,28,0.08);

  --progress-track-bg: rgba(0,0,0,0.08);

  --nav-bg: #ECEFF1;
  --nav-border: #CFD8DC;
  --nav-title-fg: #90A4AE;
  --nav-link-fg: #546E7A;
  --nav-link-hover-bg: rgba(84,110,122,0.08);
  --nav-link-hover-fg: #37474F;
  --nav-active-bg: rgba(84,110,122,0.12);
  --nav-active-fg: #263238;
  --nav-active-border: rgba(84,110,122,0.45);

  --chart-container-bg: #F0F0F0;
  --chart-1: #546E7A; --chart-2: #2E7D32; --chart-3: #E65100; --chart-4: #C62828;
  --chart-5: #6A1B9A; --chart-6: #1565C0; --chart-7: #00695C; --chart-8: #827717;

  /* Header text — ensures legibility on both light and dark header backgrounds */
  --header-fg: #FFFFFF;
  --header-fg-muted: rgba(255,255,255,0.80);
}
'@

}