/* Reset and app frame: a fixed, full-screen three-row layout. */
*, *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
  touch-action: manipulation;
}

.topbar, .bottom, .reader { -webkit-touch-callout: none; -webkit-user-select: none; user-select: none; }

html { background: var(--bg-outer); }

/* On wide screens the app is a tablet-width column on a plain background. */
body {
  display: grid;
  grid-template-rows: calc(var(--top-h) + var(--safe-t)) 1fr auto;
  height: 100dvh;
  max-width: var(--app-max);
  margin: 0 auto;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

input, textarea, select { font: inherit; color: inherit; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

[hidden] { display: none !important; }

.icon { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

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

@media (prefers-reduced-motion: reduce) {
  :root { --dur: 0ms; }
}