/* ==========================================================================
   Variables CSS — Design Tokens
   Central source of truth for all design decisions
   ========================================================================== */

:root {
  /* -----------------------------------------------------------------------
     Colors — Dark Premium Theme
     ----------------------------------------------------------------------- */
  --bg-primary: #050505;
  --bg-secondary: #0a0a0a;
  --bg-tertiary: #111111;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.06);
  --bg-glass: rgba(255, 255, 255, 0.05);

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(79, 140, 255, 0.3);

  --accent: #4F8CFF;
  --accent-glow: rgba(79, 140, 255, 0.15);
  --accent-light: #6DA3FF;

  --text-primary: #f5f5f5;
  --text-secondary: #a0a0a0;
  --text-muted: #666666;
  --white: #ffffff;

  --gradient-blue: linear-gradient(135deg, #4F8CFF 0%, #3B6FD4 100%);
  --gradient-dark: linear-gradient(180deg, #0a0a0a 0%, #050505 100%);
  --gradient-card: linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.01) 100%);

  /* -----------------------------------------------------------------------
     Typography
     ----------------------------------------------------------------------- */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-accent: 'Space Grotesk', sans-serif;

  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.5rem;
  --font-size-hero: clamp(3rem, 6vw, 5rem);

  /* -----------------------------------------------------------------------
     Spacing
     ----------------------------------------------------------------------- */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;
  --space-5xl: 128px;
  --section-padding: clamp(80px, 10vw, 140px);

  /* -----------------------------------------------------------------------
     Layout
     ----------------------------------------------------------------------- */
  --max-width: 1200px;
  --max-width-narrow: 800px;

  /* -----------------------------------------------------------------------
     Borders
     ----------------------------------------------------------------------- */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* -----------------------------------------------------------------------
     Shadows
     ----------------------------------------------------------------------- */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(79, 140, 255, 0.15);
  --shadow-glow-strong: 0 0 60px rgba(79, 140, 255, 0.25);

  /* -----------------------------------------------------------------------
     Transitions
     ----------------------------------------------------------------------- */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.6s ease;
  --transition-spring: 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}