/**
 * Volt CSS Variables
 *
 * Design system tokens for the Volt CSS framework.
 * Light theme is default, dark theme overrides via media query.
 */

:root {
  /* Typography Scale - Modular scale based on 1.25 ratio */
  --font-size-base: 18px;
  --font-size-sm: 0.889rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.266rem;
  --font-size-2xl: 1.424rem;
  --font-size-3xl: 1.802rem;
  --font-size-4xl: 2.027rem;
  --font-size-5xl: 2.566rem;

  --font-sans: "Fira Sans", sans-serif;
  --font-display: "DM Sans", sans-serif;
  --font-serif: "Libre Baskerville", serif;
  --font-mono: "Google Sans Code", monospace;

  /* Spacing Scale - Based on 0.5rem increments */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  --line-height-tight: 1.25;
  --line-height-base: 1.6;
  --line-height-relaxed: 1.8;

  --content-width: 79ch;
  /* Width of margin notes */
  --sidenote-width: 18rem;
  /* Space between content and sidenotes */
  --sidenote-gap: 2rem;

  --color-bg: #fefefe;
  /* For code blocks, tables */
  --color-bg-alt: #f5f5f5;
  --color-text: #1a1a1a;
  --color-text-muted: #666666;
  /* Links, primary actions */
  --color-accent: #0066cc;
  --color-accent-hover: #0052a3;
  --color-border: #d4d4d4;
  --color-code-bg: #f8f8f8;
  /* Highlighted text */
  --color-mark: #fff3cd;
  --color-success: #22863a;
  --color-warning: #bf8700;
  --color-error: #cb2431;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

  /* Border Radius */
  --radius-xs: 1px;
  --radius-sm: 3px;
  --radius-md: 6px;
  --radius-lg: 8px;

  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
}

/**
 * Dark Theme Overrides
 *
 * Automatically applied when user prefers dark color scheme
 */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1a1a1a;
    --color-bg-alt: #2a2a2a;
    --color-text: #e6e6e6;
    --color-text-muted: #a0a0a0;
    --color-accent: #4da6ff;
    --color-accent-hover: #66b3ff;
    --color-border: #404040;
    --color-code-bg: #2a2a2a;
    --color-mark: #4a4a00;
    --color-success: #34d058;
    --color-warning: #ffdf5d;
    --color-error: #f97583;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
  }
}