:root {
  --paper: #fff;
  --text: #1c1b2e;
  --muted: #8a8ea0;
  --panel: rgba(255, 255, 255, .88);
  --panel-solid: #fff;
  --line: rgba(20, 8, 88, .14);
  --hover: rgba(20, 8, 88, .07);
  --accent: #0050b4;
  --danger: #c0262d;
  --warn: #8a5300;
  color-scheme: light;
}

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

/* An author `display` beats the UA's [hidden] rule, and the toolbar buttons all set one. */
[hidden] { display: none !important; }

html, body {
  height: 100%;
  margin: 0;
  overflow: hidden;
  overscroll-behavior: none;              /* no pull-to-refresh or rubber-band under the pen */
  background: var(--paper);
  color: var(--text);
  font: 14px/1.4 system-ui, -apple-system, 'Helvetica Neue', Arial, sans-serif;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;            /* iOS: no callout / loupe on a long press */
  -webkit-tap-highlight-color: transparent;
}

/* The writing surface is the whole viewport. `fixed` + `inset: 0` rather than 100vh, which
   on a phone includes the part of the page the address bar is covering. */
#board {
  position: fixed;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;                     /* handwriting.js sets this too; the page must not scroll or zoom under a pen */
  cursor: crosshair;
}

.hint {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  margin: 0;
  color: rgba(20, 8, 88, .2);
  font-size: clamp(22px, 4vw, 36px);
  font-weight: 300;
  pointer-events: none;
  transition: opacity .25s ease;
}
body.has-ink .hint,
body.is-inking .hint { opacity: 0; }

/* ---------------- toolbar ---------------- */

.toolbar {
  position: fixed;
  top: calc(env(safe-area-inset-top, 0px) + 12px);
  left: calc(env(safe-area-inset-left, 0px) + 12px);
  right: calc(env(safe-area-inset-right, 0px) + 12px);
  width: fit-content;                     /* with left/right and auto margins: centred, wraps at the screen edge */
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 2px 16px;
  padding: 4px;                           /* even all round; the end controls sit concentric with the rounded ends */
  border: 1px solid var(--line);
  border-radius: 999px;                   /* fully rounded: the radius clamps to half the height, one row or two */
  background: var(--panel);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  backdrop-filter: blur(14px) saturate(1.4);
  box-shadow: 0 8px 28px rgba(20, 8, 88, .12);
  transition: opacity .2s ease;
  touch-action: manipulation;
}

/* While a stroke is being written the toolbar and the result panel step back, so they are
   not under the hand. */
body.is-inking .toolbar,
body.is-inking .result { opacity: .1; pointer-events: none; }

.group { display: flex; align-items: center; }

/* Every control is a 36px round target however small it draws, so the hover, armed and
   focus shapes all match the dots and the pill. */
.swatch, .nib, .tool {
  appearance: none;
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--text);
  cursor: pointer;
}

.swatch::before {
  content: '';
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--c);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, .14);
}
.swatch[aria-pressed="true"]::before {
  box-shadow: 0 0 0 2px var(--panel-solid), 0 0 0 4px var(--text);
}

.nib::before {
  content: '';
  width: var(--d);
  height: var(--d);
  border-radius: 50%;
  background: var(--muted);
}
.nib[aria-pressed="true"]::before { background: var(--text); }

.tool:hover:not(:disabled) { background: var(--hover); }
.tool:disabled { opacity: .3; cursor: default; }

.swatch:focus-visible, .nib:focus-visible, .tool:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.icon {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Clear asks twice: the first press swaps the bin for a question mark (see app.js). */
.icon--sure { display: none; }
#clear.is-armed { color: var(--danger); background: rgba(192, 38, 45, .1); }
#clear.is-armed .icon--clear { display: none; }
#clear.is-armed .icon--sure { display: block; }

.icon--exit { display: none; }
#fullscreen[aria-pressed="true"] .icon--enter { display: none; }
#fullscreen[aria-pressed="true"] .icon--exit { display: block; }

/* ---------------- recognised text ---------------- */
/* Opens at the bottom when Recognise is pressed. data-state (set by app.js) decides what shows:
   busy (engine loading or reading), done, unsure (read, but not confidently), empty, error. */

.result {
  position: fixed;
  left: 0;
  right: 0;
  bottom: calc(env(safe-area-inset-bottom, 0px) + 12px);
  width: min(560px, calc(100% - 24px - env(safe-area-inset-left, 0px) - env(safe-area-inset-right, 0px)));
  margin-inline: auto;
  padding: 4px 4px 12px 18px;
  border: 1px solid var(--line);
  border-radius: 26px;
  background: var(--panel);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  backdrop-filter: blur(14px) saturate(1.4);
  box-shadow: 0 8px 28px rgba(20, 8, 88, .12);
  transition: opacity .2s ease;
}

.result__bar { display: flex; align-items: center; gap: 2px; }

.result__status {
  flex: 1;
  margin: 0;
  padding: 8px 8px 8px 0;
  color: var(--muted);
  font-size: 13px;
}
.result[data-state="unsure"] .result__status { color: var(--warn); }
.result[data-state="empty"] .result__status,
.result[data-state="error"] .result__status { color: var(--danger); }

.result[data-state="busy"] .result__status::before {
  content: '';
  display: inline-block;
  width: 11px;
  height: 11px;
  margin-right: 8px;
  vertical-align: -2px;
  border: 2px solid var(--line);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Only a finished reading has text to edit, copy, or qualify. */
.result__text, .result__note, #result-copy { display: none; }
.result[data-state="done"] .result__text,
.result[data-state="unsure"] .result__text { display: block; }
.result[data-state="done"] .result__note,
.result[data-state="unsure"] .result__note { display: block; }
.result[data-state="done"] #result-copy,
.result[data-state="unsure"] #result-copy { display: inline-grid; }

.result__text {
  width: calc(100% - 14px);
  min-height: 5.5em;
  max-height: 40vh;
  margin: 2px 0 0;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  color: var(--text);
  font: 16px/1.45 system-ui, -apple-system, 'Helvetica Neue', Arial, sans-serif;   /* 16px: iOS zooms into anything smaller */
  resize: vertical;
  -webkit-user-select: text;
  user-select: text;                       /* the page itself is unselectable; this text must not be */
}
.result__text:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

.result__note { margin: 8px 14px 0 0; color: var(--muted); font-size: 12px; }

.icon--copied { display: none; }
#result-copy.is-done .icon--copy { display: none; }
#result-copy.is-done .icon--copied { display: block; }

/* Recognise is working: the icon breathes. */
#recognise[aria-busy="true"] .icon { animation: breathe 1s ease-in-out infinite; }
@keyframes breathe { 50% { opacity: .35; } }

@media (prefers-reduced-motion: reduce) {
  .toolbar, .hint, .result { transition: none; }
  .result[data-state="busy"] .result__status::before,
  #recognise[aria-busy="true"] .icon { animation: none; }
}