/* =========================================================================
   reset.css — base reset + global focus contract + layout utilities
   (DESIGN.md v2 §3A reset.css, §6 a11y focus)
   Dependency: tokens.css
   ========================================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--foreground);
  background: var(--background);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, p { margin: 0; }
button { font: inherit; color: inherit; cursor: pointer; background: none; border: none; }
a { color: inherit; }
::selection { background: color-mix(in srgb, var(--foreground) 14%, transparent); }

/* --- global focus-visible contract (§6: 3px ring offset 2px, never outline:none w/o replacement) --- */
:where(button, a, input, [role="button"], [role="tab"], [role="slider"], [role="switch"], [role="radio"]):focus-visible {
  outline: 3px solid var(--ring);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ---------- layout utilities ---------- */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(var(--sp-4), 4vw, var(--sp-12));
}
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: var(--sp-2); top: -100px; z-index: 100;
  background: var(--primary); color: var(--primary-foreground);
  padding: var(--sp-2) var(--sp-4); border-radius: var(--radius-md);
  transition: top var(--dur-fast) var(--ease-standard);
}
.skip-link:focus-visible { top: var(--sp-2); }