Private/Get-DhCssDefaultDark.ps1

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

    return @'
:root {
  /* DefaultDark — Industrial dark, electric-cyan accents */
  --bg-page: #0b0f14;
  --bg-header: #0d1219;
  --bg-surface: #111720;
  --bg-table: #0f141b;
  --bg-row-alt: #131922;
  --bg-row-hover: #1a2332;
  --bg-row-sel: #0a2540;
  --bg-thead: #161e2b;

  --accent-primary: #00c8ff;
  --accent-secondary: #0077cc;
  --accent-danger: #ff4d6a;
  --accent-warn: #ffc107;
  --accent-ok: #00e676;

  --export-csv-bg: #1a3a1a; --export-csv-fg: #57d47c; --export-csv-bdr: #2a5a2a;
  --export-xlsx-bg: #1a2f1a; --export-xlsx-fg: #4caf50; --export-xlsx-bdr: #266926;
  --export-pdf-bg: #3a1a1a; --export-pdf-fg: #ff7070; --export-pdf-bdr: #5a2a2a;

  --text-primary: #e2eaf4;
  --text-secondary: #8899aa;
  --text-muted: #4a5a6a;
  --text-accent: #00c8ff;
  --text-invert: #0b0f14;

  --border-subtle: #1e2b3a;
  --border-medium: #2a3a4d;
  --border-strong: #00c8ff44;

  --font-ui: 'Segoe UI', 'SF Pro Text', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Cascadia Code', 'Consolas', monospace;
  --font-display: 'Segoe UI', 'SF Pro Display', system-ui, 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 4px 16px #00000080;
  --shadow-glow: 0 0 16px #00c8ff22;

  --cell-ok-fg: #00e676; --cell-ok-bg: rgba(0,230,118,0.08);
  --cell-warn-fg: #ffc107; --cell-warn-bg: rgba(255,193,7,0.08);
  --cell-danger-fg: #ff4d6a; --cell-danger-bg: rgba(255,77,106,0.10);

  --progress-track-bg: rgba(255,255,255,0.08);

  --nav-bg: #0d1219;
  --nav-border: #1e2b3a;
  --nav-title-fg: #4a6070;
  --nav-link-fg: #8899aa;
  --nav-link-hover-bg: rgba(0,200,255,0.08);
  --nav-link-hover-fg: #00c8ff;
  --nav-active-bg: rgba(0,200,255,0.12);
  --nav-active-fg: #00c8ff;
  --nav-active-border: rgba(0,200,255,0.35);

  --chart-container-bg: #0f141b;
  --chart-1: #00c8ff; --chart-2: #00e676; --chart-3: #ffc107; --chart-4: #ff4d6a;
  --chart-5: #a855f7; --chart-6: #f97316; --chart-7: #06b6d4; --chart-8: #84cc16;

  /* Header text — ensures legibility on both light and dark header backgrounds */
  --header-fg: #e2eaf4;
  --header-fg-muted: #8899aa;
}
'@

}