*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--surface-app);
  color: var(--text-primary);
  line-height: var(--leading-normal);
  min-width: 320px;
}
h1, h2, h3, h4 { line-height: var(--leading-tight); margin: 0; font-weight: 700; }
p { margin: 0; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
ul { margin: 0; padding: 0; list-style: none; }

:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-ring-offset);
}

.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(--space-3); top: -3rem;
  background: var(--surface-raised); color: var(--text-primary);
  padding: var(--space-2) var(--space-4); border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md); z-index: 100; transition: top var(--duration-fast) var(--ease-standard);
}
.skip-link:focus { top: var(--space-3); }