/* ── Reset and app shell ───────────────────────────────────────────────────
   Everything here exists to make the page behave like an application rather
   than a document, on a phone as much as on a monitor.
   ------------------------------------------------------------------------ */

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

html {
  /* iOS enlarges text in landscape unless told not to, which silently breaks
     every fixed-height row in the layout. */
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  background: var(--bg);
}

body {
  margin: 0;
  min-width: 320px;
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.45;
  color: var(--text);
  background: var(--bg);
  /* Synthesised bold on a face that lacks the weight looks like a different
     typeface at display sizes. */
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
  /* Safari's URL bar makes 100vh taller than the visible viewport, so a
     100vh shell hides its own bottom edge behind the toolbar. dvh tracks the
     bar as it collapses; the svh fallback is correct on Safari 15. */
  min-height: 100svh;
  min-height: 100dvh;
}

#root {
  min-height: 100svh;
  min-height: 100dvh;
  isolation: isolate;
}

/* Kill the 300ms tap delay and the grey flash iOS paints over tapped
   elements, both of which read as lag rather than as feedback. */
button,
a,
[role="button"],
input,
select,
textarea,
summary {
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

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

button {
  border: 0;
  background: none;
  cursor: pointer;
}

/* Safari refuses to inherit the accent on form controls otherwise, and shows
   a blue caret on a red-and-black interface. */
input,
textarea,
select {
  accent-color: var(--accent);
  caret-color: var(--accent);
}

/* iOS zooms the whole viewport when a focused field is under 16px, and never
   zooms back out. This is the single most common reason a web app feels
   broken on a phone. */
@supports (-webkit-touch-callout: none) {
  input,
  select,
  textarea {
    font-size: max(16px, 1em);
  }
}

a {
  color: inherit;
  text-decoration: none;
}

code,
pre,
kbd {
  font-family: var(--font-mono);
  font-size: 0.85em;
}

pre {
  margin: 0;
}

/* Only ever show a focus ring for a keyboard, never for a tap. */
:focus {
  outline: none;
}
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

/* Scrollbars: visible enough to grab with a mouse, invisible on a phone. */
@media (pointer: fine) {
  * {
    scrollbar-width: thin;
    scrollbar-color: var(--line-bright) transparent;
  }
}

::selection {
  background: var(--accent-wash-strong);
  color: var(--foreground);
}

/* Respect the system setting rather than animating regardless. Transforms and
   opacity still settle instantly so nothing appears mid-flight. */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Visually hidden but still read aloud. */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}