:root {
  /* Roof Technologies Brand Colors */
  --color-primary: #00BCD4;          /* Cyan — roof/solar panels */
  --color-primary-light: #26C6DA;
  --color-primary-dark: #0097A7;
  --color-accent: #F5921E;           /* Orange — logo text/sun */
  --color-accent-light: #FFB74D;
  --color-accent-dark: #E07B0D;

  /* Dark Mode Neutrals */
  --color-bg: #0D1117;               /* Deep dark background */
  --color-surface: #161B22;           /* Card/panel surfaces */
  --color-surface-hover: #1C2333;
  --color-surface-raised: #21262D;    /* Elevated elements */
  --color-border: #30363D;
  --color-text: #E6EDF3;             /* Primary text — bright for readability */
  --color-text-secondary: #8B949E;
  --color-text-muted: #6E7681;

  /* Status */
  --color-success: #3FB950;
  --color-warning: #D29922;
  --color-error: #F85149;

  /* Chat bubbles */
  --color-user-bubble: #00BCD4;
  --color-user-text: #FFFFFF;
  --color-ai-bubble: #21262D;
  --color-ai-text: #E6EDF3;

  /* Difficulty badges */
  --color-beginner: #3FB950;
  --color-intermediate: #D29922;
  --color-advanced: #F85149;

  /* Typography — RepGym brand system */
  --font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-family-heading: 'Space Grotesk', 'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-family-brand: 'Archivo Black', 'Arial Black', Impact, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Borders */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Shadows — subtle glow effect in dark mode */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 20px rgba(0, 188, 212, 0.15);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

/* Light Mode Theme */
[data-theme="light"] {
  --color-bg: #F6F8FA;
  --color-surface: #FFFFFF;
  --color-surface-hover: #F3F4F6;
  --color-surface-raised: #F0F1F3;
  --color-border: #D1D5DB;
  --color-text: #1F2937;
  --color-text-secondary: #4B5563;
  --color-text-muted: #9CA3AF;

  --color-ai-bubble: #F3F4F6;
  --color-ai-text: #1F2937;
  --color-user-bubble: #00BCD4;
  --color-user-text: #FFFFFF;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --shadow-glow: 0 0 20px rgba(0, 188, 212, 0.1);
}