/* ═══════════════════════════════════════════════════════════════════════════
   DNS Panopticon — Base Styles
   CSS reset, body, typography foundation, focus, and skip link.
   ═══════════════════════════════════════════════════════════════════════════ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  /* Prevent layout shift when scrollbar appears/disappears */
  scrollbar-gutter: stable;
}

body {
  font-family: 'Manrope', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI',
               Roboto, sans-serif;
  background: var(--bg);
  color: var(--txt);
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Accessible focus ring ───────────────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: 3px;
}

/* ── Skip navigation link ────────────────────────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  z-index: 9999;
  padding: 8px 16px;
  background: var(--primary);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border-radius: 0 0 6px 0;
  transition: top var(--t-fast);
}

.skip-link:focus {
  top: 0;
}

/* ── Visually hidden (screen-reader only) ───────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}