/* Base: reset, typography, focus, utilities */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: var(--link); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.1;
  margin: 0 0 var(--s-3);
  letter-spacing: -0.01em;
  text-wrap: balance;
}
h1 { font-size: var(--step-5); }
h2 { font-size: var(--step-3); }
h3 { font-size: var(--step-1); }
h4 { font-size: var(--step-0); }
p { margin: 0 0 var(--s-4); max-width: 68ch; text-wrap: pretty; }
small, .small { font-size: var(--step--1); }

/* Spanish text gets the display face so it reads as "the thing you're learning" */
.es {
  font-family: var(--font-display);
  font-weight: 700;
}
.pron { color: var(--text-muted); font-size: var(--step--1); font-style: italic; }
.muted { color: var(--text-2); }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 6px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: var(--s-4); top: -60px; z-index: 100;
  background: var(--surface); color: var(--text);
  padding: var(--s-2) var(--s-4); border-radius: var(--r-sm);
  font-weight: 700; text-decoration: none;
  box-shadow: var(--shadow-float);
}
.skip-link:focus { top: var(--s-3); }

.stack > * + * { margin-top: var(--s-4); }
.row { display: flex; align-items: center; gap: var(--s-3); }
.wrap { flex-wrap: wrap; }
.grow { flex: 1 1 auto; min-width: 0; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}