/* ===== CSS CUSTOM PROPERTIES (VARIABLES) ===== */
:root {
  /* === COLORS === */
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --primary-color: #667eea;
  --secondary-color: #764ba2;
  --accent-color: #00d4ff;
  
  /* Dark Theme */
  --bg-primary: #0a0a0a;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #2a2a2a;
  --bg-glass: rgba(10, 10, 10, 0.95);
  --bg-card: rgba(26, 26, 26, 0.8);
  /* Site-wide page background (unified) */
  --bg-page: linear-gradient(180deg, #0a0a0a 0%, #111111 100%);
  
  /* Text Colors */
  --text-primary: #ffffff;
  --text-secondary: #b3b3b3;
  --text-muted: #808080;
  --text-gradient: var(--primary-gradient);
  
  /* Border Colors */
  --border-primary: rgba(255, 255, 255, 0.1);
  --border-secondary: rgba(102, 126, 234, 0.3);
  --border-accent: rgba(0, 212, 255, 0.3);
  
  /* === TYPOGRAPHY === */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
  --font-weights: {
    light: 300;
    regular: 400;
    medium: 500;
    semibold: 600;
    bold: 700;
    extrabold: 800;
  };
  
  /* Font Sizes - Fluid Typography */
  --fs-xs: clamp(0.75rem, 0.5vw + 0.5rem, 0.875rem);
  --fs-sm: clamp(0.875rem, 0.5vw + 0.75rem, 1rem);
  --fs-base: clamp(1rem, 1vw + 0.75rem, 1.125rem);
  --fs-lg: clamp(1.125rem, 1.5vw + 0.75rem, 1.25rem);
  --fs-xl: clamp(1.25rem, 2vw + 0.75rem, 1.5rem);
  --fs-2xl: clamp(1.5rem, 3vw + 1rem, 2rem);
  --fs-3xl: clamp(2rem, 4vw + 1rem, 3rem);
  --fs-4xl: clamp(2.5rem, 5vw + 1.5rem, 4rem);
  --fs-5xl: clamp(3rem, 6vw + 2rem, 5rem);
  
  /* Line Heights */
  --lh-tight: 1.2;
  --lh-normal: 1.5;
  --lh-relaxed: 1.7;
  
  /* === SPACING === */
  --space-xs: clamp(0.5rem, 1vw, 0.75rem);
  --space-sm: clamp(0.75rem, 1.5vw, 1rem);
  --space-md: clamp(1rem, 2vw, 1.5rem);
  --space-lg: clamp(1.5rem, 3vw, 2rem);
  --space-xl: clamp(2rem, 4vw, 3rem);
  --space-2xl: clamp(3rem, 5vw, 4rem);
  --space-3xl: clamp(4rem, 6vw, 6rem);
  --space-4xl: clamp(6rem, 8vw, 8rem);
  
  /* === LAYOUT === */
  --container-max: 1200px;
  --container-padding: clamp(1rem, 3vw, 2rem);
  --section-padding: var(--space-3xl) 0;
  
  /* === GRID === */
  --grid-gap: clamp(0.75rem, 2vw, 1.5rem);
  --grid-cols-mobile: 1;
  --grid-cols-tablet: 2;
  --grid-cols-desktop: 3;
  
  /* === BORDERS & RADIUS === */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 50%;
  
  /* === SHADOWS === */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
  --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.3);
  --shadow-glow-accent: 0 0 30px rgba(0, 212, 255, 0.2);
  
  /* === TRANSITIONS === */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  --transition-bounce: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* === Z-INDEX SCALE === */
  --z-dropdown: 1000;
  --z-sticky: 1010;
  --z-fixed: 1020;
  --z-modal-backdrop: 1030;
  --z-modal: 1040;
  --z-popover: 1050;
  --z-tooltip: 1060;
  
  /* === ANIMATIONS === */
  --animation-duration: 0.6s;
  --animation-easing: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --animation-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* === BREAKPOINTS (for JS usage) === */
  --bp-mobile: 640px;
  --bp-tablet: 768px;
  --bp-desktop: 1024px;
  --bp-wide: 1280px;
  --bp-ultrawide: 1536px;
}

/* === RESPONSIVE CONTAINER QUERIES === */
@container (min-width: 640px) {
  :root {
    --grid-cols: var(--grid-cols-tablet);
  }
}

@container (min-width: 1024px) {
  :root {
    --grid-cols: var(--grid-cols-desktop);
  }
}

/* === DARK MODE SUPPORT === */
@media (prefers-color-scheme: light) {
  :root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #e2e8f0;
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-muted: #718096;
  }
}

/* === FORCE DARK THEME OVERRIDE (ensures consistent dark look) === */
:root {
  /* Re-assert dark palette to avoid light mode overriding visuals */
  --bg-primary: #0a0a0a;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #2a2a2a;
  --text-primary: #ffffff;
  --text-secondary: #b3b3b3;
  --text-muted: #808080;
  --bg-page: linear-gradient(180deg, #0a0a0a 0%, #111111 100%);
}

/* === REDUCED MOTION === */
@media (prefers-reduced-motion: reduce) {
  :root {
    --animation-duration: 0.01ms;
    --transition-fast: 0.01ms;
    --transition-normal: 0.01ms;
    --transition-slow: 0.01ms;
  }
}