/* =========================================================
   StarQR — reset.css
   Browser Reset & Base Styles
   Normalizes cross-browser defaults and sets global rules.
   ========================================================= */

/* ── Universal Box-Sizing Reset ───────────────────────── */
/* Makes padding/border included in element width/height  */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent; /* Remove tap flash on mobile */
}

/* ── HTML Root ────────────────────────────────────────── */
html {
  font-size: 16px;                    /* 1rem = 16px baseline           */
  scroll-behavior: smooth;            /* Smooth scroll for anchor links */
  -webkit-text-size-adjust: 100%;     /* Prevent iOS font-size boost   */
}

/* ── Body ─────────────────────────────────────────────── */
body {
  font-family: var(--font);
  font-size: var(--text-base);
  color: var(--text-primary);
  background-color: var(--bg);
  min-height: 100dvh;                 /* dvh = dynamic viewport height  */
  overflow-x: hidden;                 /* Prevent horizontal scroll      */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;

  /* iOS safe area insets — prevents content from hiding behind notch */
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

/* ── Accessibility: Reduced Motion ────────────────────── */
/* Users who prefer less motion get instant transitions   */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ── Accessibility: Skip-to-Content Link ──────────────── */
/* Hidden by default, appears on Tab key press for        */
/* keyboard users to skip past decorative elements.       */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 9999;
  padding: 12px 24px;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  font-size: var(--text-sm);
  border-radius: var(--radius-sm);
  text-decoration: none;
  box-shadow: var(--shadow-md);
  transition: top var(--dur-fast) var(--ease-out);
}

/* Show skip link when focused via keyboard */
.skip-link:focus {
  top: 16px;
  outline: 3px solid var(--primary-glow);
  outline-offset: 2px;
}

/* ── Focus-Visible Styles ─────────────────────────────── */
/* Modern focus indicator: only shown for keyboard users, */
/* not for mouse/touch clicks. Improves accessibility.    */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Remove default outline for mouse/touch users */
:focus:not(:focus-visible) {
  outline: none;
}