/* -----------------------------
   Reset (light, not destructive)
------------------------------ */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}

/* -----------------------------
   Typography
------------------------------ */

:root {
  /* Fonts */
  --fd-font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI',
    Roboto, Helvetica, Arial, sans-serif;
  --fd-font-mono: ui-monospace, SFMono-Regular, Menlo, monospace;

  /* Font sizes */
  --fd-font-size-xs: 0.75rem;
  --fd-font-size-sm: 0.875rem;
  --fd-font-size-md: 1rem;
  --fd-font-size-lg: 1.125rem;
  --fd-font-size-xl: 1.25rem;

  /* Line heights */
  --fd-line-height-tight: 1.25;
  --fd-line-height-normal: 1.5;
  --fd-line-height-loose: 1.75;
}

body {
  margin: 0;
  font-family: var(--fd-font-sans);
  font-size: var(--fd-font-size-md);
  line-height: var(--fd-line-height-normal);
  color: var(--fd-color-text, #111827);
  background: var(--fd-color-background, #ffffff);
}

/* Headings */

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0 0 0.5em;
  font-weight: 600;
  line-height: var(--fd-line-height-tight);
}

h1 {
  font-size: 2rem;
}
h2 {
  font-size: 1.5rem;
}
h3 {
  font-size: 1.25rem;
}
h4 {
  font-size: 1.125rem;
}
h5 {
  font-size: 1rem;
}
h6 {
  font-size: 0.875rem;
}

/* Text elements */

p {
  margin: 0 0 1em;
}

small {
  font-size: var(--fd-font-size-sm);
}

code {
  font-family: var(--fd-font-mono);
  font-size: 0.875em;
}

/* -----------------------------
   Spacing scale
------------------------------ */

:root {
  --fd-space-0: 0;
  --fd-space-1: 4px;
  --fd-space-2: 8px;
  --fd-space-3: 12px;
  --fd-space-4: 16px;
  --fd-space-5: 20px;
  --fd-space-6: 24px;
}

/* -----------------------------
   Color tokens (minimal v0.1)
------------------------------ */

:root {
  --fd-color-text: #111827;
  --fd-color-muted: #6b7280;

  --fd-color-background: #ffffff;
  --fd-color-surface: #ffffff;

  --fd-color-border: #d1d5db;

  --fd-color-primary: #2563eb;
  --fd-color-on-primary: #ffffff;

  --fd-color-focus: #2563eb;
}

/* -----------------------------
   Focus visibility (important)
------------------------------ */

:focus-visible {
  outline: 2px solid var(--fd-color-focus);
  outline-offset: 2px;
}