/**
 * Browser Arcade - Design Tokens & Custom Properties
 * Zero-cost, high-contrast, modern arcade aesthetic
 */

:root {
  /* Surface & Background Palette */
  --bg-app: #090a10;
  --bg-surface: #121420;
  --bg-surface-elevated: #1a1d30;
  --bg-surface-card: rgba(22, 25, 42, 0.75);
  --bg-glass: rgba(18, 20, 32, 0.85);
  --bg-board: #161826;
  --bg-cell-empty: rgba(255, 255, 255, 0.04);

  /* Primary Brand Neon Palette */
  --primary-50: #eef2ff;
  --primary-100: #e0e7ff;
  --primary-400: #818cf8;
  --primary-500: #6366f1;
  --primary-600: #4f46e5;
  --primary-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
  --primary-glow: 0 0 25px rgba(99, 102, 241, 0.35);

  /* Secondary & Accent */
  --accent-cyan: #06b6d4;
  --accent-pink: #ec4899;
  --accent-purple: #8b5cf6;
  --accent-amber: #f59e0b;
  --accent-emerald: #10b981;

  /* Typography Colors */
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-inverse: #090a10;

  /* Borders & Dividers */
  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-medium: rgba(255, 255, 255, 0.14);
  --border-focus: #6366f1;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.25);

  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Layout Dimensions */
  --header-height: 68px;
  --container-max-width: 1200px;
  --game-max-width: 460px;

  /* Future AdSense Placeholder Dimensions (IAB Standards) */
  --ad-leaderboard-w: 728px;
  --ad-leaderboard-h: 90px;
  --ad-mobile-banner-w: 320px;
  --ad-mobile-banner-h: 50px;
  --ad-rect-w: 300px;
  --ad-rect-h: 250px;

  /* 2048 Game Color Scale (Vibrant, high contrast, neo-arcade aesthetic) */
  --tile-2-bg: #1e2238;
  --tile-2-color: #f1f5f9;
  --tile-4-bg: #282f4d;
  --tile-4-color: #f8fafc;
  --tile-8-bg: #f97316;
  --tile-8-color: #ffffff;
  --tile-16-bg: #ea580c;
  --tile-16-color: #ffffff;
  --tile-32-bg: #ef4444;
  --tile-32-color: #ffffff;
  --tile-64-bg: #dc2626;
  --tile-64-color: #ffffff;
  --tile-128-bg: #eab308;
  --tile-128-color: #0f172a;
  --tile-128-glow: 0 0 16px rgba(234, 179, 8, 0.4);
  --tile-256-bg: #eab308;
  --tile-256-color: #0f172a;
  --tile-256-glow: 0 0 22px rgba(234, 179, 8, 0.55);
  --tile-512-bg: #10b981;
  --tile-512-color: #ffffff;
  --tile-512-glow: 0 0 26px rgba(16, 185, 129, 0.6);
  --tile-1024-bg: #06b6d4;
  --tile-1024-color: #ffffff;
  --tile-1024-glow: 0 0 30px rgba(6, 182, 212, 0.7);
  --tile-2048-bg: linear-gradient(135deg, #6366f1 0%, #ec4899 100%);
  --tile-2048-color: #ffffff;
  --tile-2048-glow: 0 0 35px rgba(236, 72, 153, 0.85);
  --tile-super-bg: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 50%, #f43f5e 100%);
  --tile-super-color: #ffffff;
  --tile-super-glow: 0 0 40px rgba(139, 92, 246, 0.9);
}