/* ==========================================================================
   Design System Tokens (Obsidian Minimalist Dark Theme)
   ========================================================================== */

:root {
  /* Background Palette (Welcoming Dark Obsidian/Charcoal) */
  --bg-main: #0f1117;
  --bg-surface: #161922;
  --bg-card: #1c202c;
  --bg-card-hover: #242a3a;
  --bg-navbar: rgba(15, 17, 23, 0.85);

  /* Typography Palette (High-Contrast & Accessible) */
  --text-primary: #f0f2f5;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0f1117;

  /* Accent Colors (Soft, Welcoming Tones for Studio UI) */
  --accent-primary: #38bdf8;     /* Sky Cyan */
  --accent-primary-hover: #0284c7;
  --accent-secondary: #818cf8;   /* Soft Indigo */
  --accent-secondary-hover: #6366f1;
  
  /* Book Spine Accents */
  --accent-violet: #a855f7;
  --accent-amber: #f59e0b;
  --accent-cyan: #06b6d4;
  --accent-rose: #f43f5e;
  --accent-indigo: #4f46e5;

  /* Stem Cell Neon Portal Aesthetics (Deliberate High Contrast) */
  --stemcell-cyan: #00ffff;
  --stemcell-cyan-glow: rgba(0, 255, 255, 0.6);
  --stemcell-cyan-glow-intense: rgba(0, 229, 255, 0.4);
  --stemcell-bg: #0b0d13;

  /* Gravity Pulse Aesthetics (Plasma Violet & Supercharge Emerald) */
  --gravitypulse-violet: #9d4edd;
  --gravitypulse-green: #00ff66;
  --gravitypulse-glow: rgba(157, 78, 221, 0.6);
  --gravitypulse-glow-intense: rgba(0, 255, 102, 0.35);
  --gravitypulse-bg: #090a10;

  /* Robot Wars Aesthetics (Steampunk Brass, Copper & Iron) */
  --robotwars-primary: #d4af37;
  --robotwars-secondary: #b87333;
  --robotwars-glow: rgba(212, 175, 55, 0.3);
  --robotwars-glow-intense: rgba(184, 115, 51, 0.25);
  --robotwars-bg: #1a120f;

  /* Shift Aesthetics (Cartoony Combat Cars, Vibrant Comic Book) */
  --shift-primary: #ffeb3b;
  --shift-secondary: #e91e63;
  --shift-glow: rgba(255, 235, 59, 0.4);
  --shift-glow-intense: rgba(233, 30, 99, 0.35);
  --shift-bg: #2a1b3d;

  /* Ko-fi Support Button Aesthetics (Site Theme Aligned: Soft Indigo) */
  --kofi-coral: #818cf8;
  --kofi-coral-glow: rgba(129, 140, 248, 0.45);
  --kofi-coral-glow-intense: rgba(129, 140, 248, 0.7);

  /* Borders & Glassmorphism */
  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-hover: rgba(255, 255, 255, 0.2);
  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 16px;
  --border-radius-pill: 50px;

  /* Typography Stacks */
  --font-title: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-robotwars: 'Orbitron', var(--font-title);
  --font-shift: 'Bangers', var(--font-title);

  /* Transitions (GPU Accelerated & Smooth) */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.16, 1, 0.3, 1);

  /* Shadows */
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 20px -3px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 30px -5px rgba(0, 0, 0, 0.55);
}