:root {
  /* Colors */
  --bg-primary: #F5F5F7;
  --bg-secondary: #EBEBED;
  --bg-dark: #1A1A1A;
  --bg-dark-lighter: #242424;
  --text-primary: #1A1A1A;
  --text-secondary: #64646B;
  --text-muted: #6E6E78;   /* >= 4.5:1 on the paper: readable, still secondary */
  --text-on-dark: #F5F5F7;
  --text-on-dark-muted: #8A8A94;
  --accent: #3366FF;
  --accent-hover: #2952CC;
  --border: #D2D2D8;
  --border-strong: #1A1A1A;
  --white: #FFFFFF;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'DM Mono', 'IBM Plex Mono', 'Consolas', monospace;

  /* Font sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.25rem;
  --text-xl: 1.5rem;
  --text-2xl: 2rem;
  --text-3xl: 2.75rem;
  --text-4xl: 3.75rem;
  --text-5xl: 5rem;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;

  /* Layout */
  --container-max: 1200px;
  --container-wide: 1400px;
  --container-padding: 1.5rem;
  --navbar-height: 60px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;
}

/* ========================================
   THEME: DARK (modern, zinc-inspired)
   ======================================== */
[data-theme="dark"] {
  --bg-primary: #0a0a0b;
  --bg-secondary: #141416;
  --bg-dark: #141418;
  --bg-dark-lighter: #1c1c20;
  --text-primary: #ededf0;
  --text-secondary: #a1a1ab;
  --text-muted: #8E8E98;
  --text-on-dark: #ededf0;
  --text-on-dark-muted: #a1a1ab;
  --accent: #5b8cff;
  --accent-hover: #7aa3ff;
  --border: #26262c;
  --border-strong: #ededf0;
  --white: #ededf0;
}

@media (min-width: 768px) {
  :root {
    --container-padding: 2rem;
  }
}

@media (min-width: 1024px) {
  :root {
    --container-padding: 3rem;
  }
}