:root {
  /* Colors */
  --color-white: #ffffff;
  --color-black: #0f172a;

  --color-bg: #ffffff;
  --color-bg-soft: #f6fbfa;
  --color-bg-muted: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-soft: #f1f8f7;

  --color-primary: #0f766e;
  --color-primary-dark: #115e59;
  --color-primary-light: #ccfbf1;
  --color-primary-soft: #e6fffb;
  --color-primary-hover: #0d5f59;

  --color-accent: #14b8a6;
  --color-accent-soft: #d9fffa;

  --color-text: #172033;
  --color-text-strong: #0f172a;
  --color-text-muted: #526071;
  --color-text-soft: #64748b;
  --color-text-inverse: #ffffff;

  --color-border: #dbe5e3;
  --color-border-soft: #edf3f2;
  --color-border-strong: #b8c7c4;

  --color-gray-50: #f8fafc;
  --color-gray-100: #f1f5f9;
  --color-gray-200: #e2e8f0;
  --color-gray-300: #cbd5e1;
  --color-gray-400: #94a3b8;
  --color-gray-500: #64748b;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1e293b;
  --color-gray-900: #0f172a;

  --color-success: #15803d;
  --color-success-bg: #ecfdf3;
  --color-success-border: #bbf7d0;

  --color-warning: #b45309;
  --color-warning-bg: #fffbeb;
  --color-warning-border: #fde68a;

  --color-error: #b91c1c;
  --color-error-bg: #fef2f2;
  --color-error-border: #fecaca;

  --color-info: #0369a1;
  --color-info-bg: #f0f9ff;
  --color-info-border: #bae6fd;

  --color-focus: #0f766e;
  --color-selection: #ccfbf1;

  /* Typography */
  --font-family-base: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  --font-family-heading: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  --font-family-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;

  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-md: 1.0625rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;

  --line-height-tight: 1.15;
  --line-height-heading: 1.2;
  --line-height-base: 1.6;
  --line-height-loose: 1.75;

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

  --letter-spacing-tight: -0.03em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.02em;

  /* Spacing */
  --space-0: 0;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-7: 1.75rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-14: 3.5rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Layout */
  --container-xs: 36rem;
  --container-sm: 48rem;
  --container-md: 64rem;
  --container-lg: 72rem;
  --container-xl: 80rem;
  --container-max: 72rem;
  --container-padding: 1rem;
  --section-padding: 3.5rem;
  --header-height: 4.25rem;

  /* Radius */
  --radius-xs: 0.25rem;
  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 0.875rem;
  --radius-xl: 1.125rem;
  --radius-2xl: 1.5rem;
  --radius-full: 999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgb(15 23 42 / 0.05);
  --shadow-sm: 0 2px 8px rgb(15 23 42 / 0.06);
  --shadow-md: 0 8px 24px rgb(15 23 42 / 0.08);
  --shadow-lg: 0 16px 40px rgb(15 23 42 / 0.1);
  --shadow-focus: 0 0 0 3px rgb(20 184 166 / 0.28);

  /* Borders */
  --border-width: 1px;
  --border-width-strong: 2px;

  /* Motion */
  --transition-fast: 150ms ease;
  --transition-base: 220ms ease;

  /* Controls */
  --control-height: 2.875rem;
  --control-height-lg: 3.25rem;
  --control-padding-x: 1rem;
  --touch-target: 2.75rem;

  /* Z-index */
  --z-header: 50;
  --z-overlay: 100;
}