:root {
  /* Viewport unit base for calculations */
  --vw: 1vw;
  --vh: 1vh;

  /* ========================================
     COLORS (Heather Charcoal + Gold)
     ======================================== */

  /* Background Colors (Neutral Charcoal Scale) */
  --color-bg-darkest: #121214;
  --color-bg-dark: #1a1a1e;
  --color-bg-elevated: #242428;
  --color-bg-hover: #2a2a2f;

  /* Foreground Colors (Silver/White Scale) */
  --color-text-primary: #f0f0f2;
  --color-text-secondary: #a0a0a8;
  --color-text-tertiary: #606068;
  --color-text-disabled: #404048;

  /* Accent Colors (Teal-Cyan - Primary UI Color) */
  --color-accent-gold: #40c8c8;
  --color-accent-hover: #50d8d8;
  --color-accent-muted: #308888;

  /* Functional Colors (Small UI Elements Only) */
  --color-health: #9b6dff;
  --color-mana: #6b8cff;
  --color-xp: #40c8a8;
  --color-danger: #9b6dff;
  --color-warning: #e8a040;
  --color-success: #40c8a8;

  /* Panel Transparency */
  --panel-bg: rgba(26, 26, 30, 0.95);
  --panel-bg-hover: rgba(42, 42, 47, 0.95);
  --panel-bg-solid: rgba(26, 26, 30, 0.98);

  /* Borders */
  --color-border: #2a2a2f;
  --color-border-hover: #3a3a40;
  --color-border-active: var(--color-accent-gold);

  /* ========================================
     TYPOGRAPHY
     ======================================== */

  /* Font Families */
  --font-display: 'Cinzel', 'Times New Roman', serif;
  --font-body: 'Crimson Text', 'Georgia', serif;
  --font-mono: 'Fira Code', 'Courier New', monospace;

  /* Type Scale (vw-based) */
  --text-xs: calc(var(--vw) * 0.65);
  --text-sm: calc(var(--vw) * 0.75);
  --text-base: calc(var(--vw) * 0.85);
  --text-md: calc(var(--vw) * 1.0);
  --text-lg: calc(var(--vw) * 1.2);
  --text-xl: calc(var(--vw) * 1.5);
  --text-2xl: calc(var(--vw) * 2.0);
  --text-3xl: calc(var(--vw) * 2.5);

  /* Letter Spacing */
  --tracking-normal: 0;
  --tracking-wide: 0.05em;
  --tracking-wider: 0.1em;

  /* ========================================
     SPACING
     ======================================== */

  --space-xs: calc(var(--vw) * 0.25);
  --space-sm: calc(var(--vw) * 0.5);
  --space-md: calc(var(--vw) * 0.75);
  --space-lg: calc(var(--vw) * 1.0);
  --space-xl: calc(var(--vw) * 1.5);
  --space-2xl: calc(var(--vw) * 2.0);
  --space-3xl: calc(var(--vw) * 3.0);

  /* ========================================
     LAYOUT DIMENSIONS
     ======================================== */

  --sidebar-width: 15vw;
  --main-content-width: 85vw;
  --banner-height: 5vh;
  --slideout-width: 15vw;

  /* ========================================
     BORDERS & RADIUS
     ======================================== */

  --border-width: calc(var(--vw) * 0.07);
  --border-width-thick: calc(var(--vw) * 0.1);
  --radius-sm: calc(var(--vw) * 0.15);
  --radius-md: calc(var(--vw) * 0.25);
  --radius-lg: calc(var(--vw) * 0.5);

  /* ========================================
     SHADOWS
     ======================================== */

  --shadow-sm: 0 calc(var(--vw) * 0.1) calc(var(--vw) * 0.2) rgba(0, 0, 0, 0.2);
  --shadow-md: 0 calc(var(--vw) * 0.2) calc(var(--vw) * 0.5) rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 calc(var(--vw) * 0.5) calc(var(--vw) * 1.0) rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 calc(var(--vw) * 1.0) rgba(64, 200, 200, 0.3);

  /* ========================================
     TRANSITIONS
     ======================================== */

  --transition-fast: 100ms ease;
  --transition-normal: 150ms ease;
  --transition-slow: 200ms ease-out;
  --transition-slide: 200ms cubic-bezier(0.4, 0, 0.2, 1);

  /* ========================================
     Z-INDEX SCALE
     ======================================== */

  --z-base: 1;
  --z-sidebar: 10;
  --z-slideout: 20;
  --z-banner: 30;
  --z-modal-bg: 100;
  --z-modal: 110;
  --z-toast: 200;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}