:root {
  /* Color system */
  --color-primary: hsl(208 88% 42%);
  --color-primary-hover: hsl(208 88% 36%);
  --color-primary-contrast: hsl(0 0% 100%);

  --color-secondary: hsl(165 70% 36%);
  --color-secondary-hover: hsl(165 70% 30%);

  --color-success: hsl(151 72% 33%);
  --color-success-muted: hsl(151 72% 33% / 0.12);
  --color-error: hsl(357 74% 46%);
  --color-error-muted: hsl(357 74% 46% / 0.1);

  --color-background: hsl(214 42% 96%);
  --color-surface: hsl(0 0% 100%);
  --color-surface-muted: hsl(210 40% 98%);
  --color-border: hsl(214 28% 83%);

  --color-text: hsl(217 43% 17%);
  --color-text-muted: hsl(215 20% 39%);

  /* Typography */
  --font-body: "Manrope", system-ui, sans-serif;
  --font-heading: "Space Grotesk", "Manrope", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;

  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.7;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  /* Layout */
  --layout-max-width: 72rem;
  --layout-content-width: 64rem;
  --panel-width-sm: 32rem;
  --panel-width-md: 44rem;
  --panel-width-lg: 52rem;

  /* Spacing */
  --spacing-2xs: 0.25rem;
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --radius-pill: 999px;

  /* Effects */
  --shadow-sm: 0 1px 2px hsl(217 43% 17% / 0.08);
  --shadow-md: 0 10px 24px hsl(217 43% 17% / 0.1);
  --shadow-lg: 0 24px 50px hsl(217 43% 17% / 0.16);

  --transition-fast: 150ms ease;
  --transition-base: 220ms ease;

  /* Layering */
  --z-fixed: 200;
  --z-modal: 400;
}