:root {
  /* Colours */
  --bg-base:        #0D1117; /* page background */
  --bg-sidebar:     #161B22; /* sidebar */
  --bg-card:        #1C2128; /* cards, panels */
  --bg-input:       #0D1117; /* form inputs */
  --bg-hover:       #21262D; /* hover state */
  --border:         #30363D; /* default borders */
  --border-focus:   #2563EB; /* focused input ring */
  --accent:         #2563EB; /* primary action blue */
  --accent-hover:   #1D4ED8; /* button hover */
  --text-primary:   #E6EDF3;
  --text-secondary: #8B949E;
  --text-muted:     #484F58;
  --success:        #3FB950;
  --warning:        #D29922;
  --danger:         #F85149;
  --sitrep-bg:      #161B22; /* SITREP message background */

  /* Typography */
  --font-ui:        system-ui, -apple-system, sans-serif;
  --font-mono:      'Courier New', Courier, monospace;
  --font-size-sm:   13px;
  --font-size-base: 15px;
  --font-size-lg:   17px;

  /* Spacing */
  --sidebar-width: 240px;
  --radius-sm:     4px;
  --radius-md:     8px;
  --radius-lg:     12px;
  --shadow:        0 1px 3px rgba(0, 0, 0, 0.4);
}