:root {
  /* Colors — Field Notes */
  --color-primary: #3D3428;
  --color-primary-hover: #2E2720;
  --color-primary-light: rgba(61, 52, 40, 0.08);
  --color-secondary: #7A6C5A;
  --color-secondary-hover: #665C4C;

  --color-text: #3D3428;
  --color-text-secondary: #6B5D4C;
  --color-text-light: #998A78;

  --color-bg: #D9C9A5;
  --color-bg-warm: #CEBF98;
  --color-bg-secondary: #D0C19B;
  --color-bg-overlay: rgba(217, 201, 165, 0.93);

  --color-border: #C4AD85;
  --color-border-focus: #3D3428;

  --color-error: #8B3A2A;
  --color-success: #4A6B3D;

  /* Route colors */
  --color-route: #3D3428;
  --color-route-outline: #2E2720;

  /* Topo line color */
  --color-topo: rgba(61, 52, 40, 0.08);
  --color-topo-strong: rgba(61, 52, 40, 0.13);

  /* Typography */
  --font-display: 'DM Mono', 'Menlo', monospace;
  --font-family: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'DM Mono', 'Menlo', monospace;

  --font-size-xs: 0.7rem;
  --font-size-sm: 0.825rem;
  --font-size-base: 0.95rem;
  --font-size-lg: 1.1rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2.25rem;
  --font-size-4xl: 3.2rem;
  --font-size-5xl: 4rem;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.15;
  --line-height-normal: 1.55;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  /* Borders */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(31, 45, 33, 0.06);
  --shadow-md: 0 4px 12px rgba(31, 45, 33, 0.08);
  --shadow-lg: 0 12px 32px rgba(31, 45, 33, 0.10);
  --shadow-xl: 0 24px 48px rgba(31, 45, 33, 0.12);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 600ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Z-index layers */
  --z-topo: 0;
  --z-map: 1;
  --z-controls: 10;
  --z-header: 20;
  --z-modal: 30;
  --z-toast: 40;
}