/* ==========================================================================
   DESIGN TOKENS & VARIABLES
   Crafted with Senior Visual Design Principles
   ========================================================================== */

:root {
  /* Color Palette - Dark Tech Aesthetic (Default) */
  --bg-primary: #0a0e17;
  --bg-secondary: #0f172a;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --bg-glass: rgba(15, 23, 42, 0.65);
  --bg-surface: #1e293b;
  --bg-elevated: #334155;
  
  /* Text Colors */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0f172a;

  /* Accent Colors */
  --accent-cyan: #06b6d4;
  --accent-indigo: #6366f1;
  --accent-blue: #38bdf8;
  --accent-purple: #a855f7;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  
  /* Gradients */
  --grad-primary: linear-gradient(135deg, #06b6d4 0%, #6366f1 100%);
  --grad-accent: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #c084fc 100%);
  --grad-glow: radial-gradient(circle at 50% -20%, rgba(99, 102, 241, 0.25) 0%, rgba(6, 182, 212, 0.05) 50%, transparent 80%);
  --grad-card-border: linear-gradient(135deg, rgba(255, 255, 255, 0.15) 0%, rgba(255, 255, 255, 0.02) 100%);
  --grad-card-border-active: linear-gradient(135deg, rgba(56, 189, 248, 0.6) 0%, rgba(99, 102, 241, 0.6) 100%);

  /* Borders & Shadows */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.15);
  --border-glow: rgba(56, 189, 248, 0.3);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 36px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 35px rgba(99, 102, 241, 0.22);
  --shadow-cyan-glow: 0 0 25px rgba(6, 182, 212, 0.3);

  /* Typography */
  --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

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

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* 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-spring: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Optional Light Mode for accessibility */
[data-theme="light"] {
  --bg-primary: #f1f5f9;
  --bg-secondary: #e2e8f0;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --bg-glass: rgba(255, 255, 255, 0.75);
  --bg-surface: #ffffff;
  --bg-elevated: #f8fafc;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-medium: rgba(0, 0, 0, 0.15);
  --grad-card-border: linear-gradient(135deg, rgba(0, 0, 0, 0.12) 0%, rgba(0, 0, 0, 0.03) 100%);
  --grad-glow: radial-gradient(circle at 50% -20%, rgba(99, 102, 241, 0.12) 0%, transparent 60%);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 16px 36px rgba(15, 23, 42, 0.12);
}