:root {
  --bg: #0b0c0e;
  --surface: #15171a;
  --surface-2: #1d2024;
  --line: #2a2e33;
  --text: #eeeeee;
  --muted: #8a9097;
  --guide: rgba(255, 255, 255, 0.16);
  --guide-tick: rgba(255, 255, 255, 0.4);
  --accent: #2ec4b6;
  --accent-ink: #04211e;
  --radius: 12px;
  --word-base: clamp(2rem, 8vw, 3.75rem);
  --size: 1;
  --fit: 1;
  --font-sans: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-serif: 'New York', 'Iowan Old Style', Charter, Georgia, 'Times New Roman', serif;
  --font-mono: ui-monospace, 'SF Mono', Menlo, Consolas, 'Liberation Mono', monospace;
  --word-font: var(--font-sans);
  color-scheme: dark;
}

body[data-accent='orange'] {
  --accent: #ff8c42;
  --accent-ink: #2a1200;
}
body[data-font='serif'] { --word-font: var(--font-serif); }
body[data-font='mono'] { --word-font: var(--font-mono); }

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.45 var(--font-sans);
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100vh;
  min-height: 100dvh;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
  -webkit-tap-highlight-color: transparent;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}

button, input, select, textarea { font: inherit; color: inherit; }
button { touch-action: manipulation; cursor: pointer; }
svg { width: 22px; height: 22px; display: block; }

/* Distraction-free view while reading: hide everything except the word and
   its guide lines. visibility (not display) keeps the reader from moving. */
.topbar, .controls, .status { transition: opacity 0.25s, visibility 0.25s; }
body.reading { cursor: none; }
body.reading .topbar,
body.reading .controls,
body.reading .status,
body.reading .toast {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

/* Top bar */
.topbar {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 12px;
}
.home-link {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  padding: 8px 6px;
  border-radius: 10px;
  white-space: nowrap;
}
.home-link:hover, .home-link:focus-visible { color: var(--text); background: var(--surface); }
.home-short { display: none; }
@media (max-width: 600px) {
  .home-long { display: none; }
  .home-short { display: inline; }
}
.doc-title {
  flex: 1;
  min-width: 0;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding: 0 8px;
}
.icon-btn {
  background: none;
  border: 0;
  border-radius: 10px;
  padding: 9px;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  gap: 2px;
}
.icon-btn:hover, .icon-btn:focus-visible { color: var(--text); background: var(--surface); }

/* Reading stage */
.stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  min-height: 0;
}

.reader {
  position: relative;
  width: min(100%, 760px);
  height: calc(var(--word-base) * var(--size) * 2.8);
  outline: none;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
}
.reader:focus-visible .guide { background: var(--guide-tick); }

.guide {
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--guide);
}
.guide-top { top: 0; }
.guide-bottom { bottom: 0; }
/* Crosshair ticks marking the fixed focal point. */
.guide::after {
  content: '';
  position: absolute;
  left: 50%;
  width: 2px;
  margin-left: -1px;
  height: calc(var(--word-base) * var(--size) * 0.45);
  background: var(--guide-tick);
}
.guide-top::after { top: 0; }
.guide-bottom::after { bottom: 0; }

/* Equal flexible columns either side of the pivot keep the pivot letter's
   centre exactly on the box's centre line, whatever the font. */
.word {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  font-family: var(--word-font);
  font-size: calc(var(--word-base) * var(--size) * var(--fit));
  font-weight: 500;
  letter-spacing: 0;
  font-kerning: none;
  font-variant-ligatures: none;
  white-space: pre;
  line-height: 1;
}
.w-before { text-align: right; overflow: visible; }
.w-after { text-align: left; overflow: visible; }
.w-pivot { color: var(--accent); }
.word.placeholder { font-size: 1.1rem; font-family: var(--font-sans); color: var(--muted); }
.word.placeholder .w-before, .word.placeholder .w-after { display: none; }
.word.placeholder .w-pivot { grid-column: 1 / -1; text-align: center; color: var(--muted); white-space: normal; }

.context {
  width: min(100%, 760px);
  min-height: 4.4em;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.5;
  text-align: center;
  visibility: hidden;
}
.context.show { visibility: visible; }
.context mark { background: none; color: var(--text); border-bottom: 2px solid var(--accent); }

.status {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
  min-height: 1.4em;
  text-align: center;
}

/* Controls */
.controls {
  width: min(100%, 760px);
  justify-self: center;
  padding: 8px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

input[type='range'] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 28px;
  background: transparent;
  accent-color: var(--accent);
  margin: 0;
}
input[type='range']::-webkit-slider-runnable-track { height: 4px; border-radius: 2px; background: var(--line); }
input[type='range']::-moz-range-track { height: 4px; border-radius: 2px; background: var(--line); }
input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  margin-top: -7px;
  border-radius: 50%;
  background: var(--accent);
  border: 0;
}
input[type='range']::-moz-range-thumb { width: 18px; height: 18px; border-radius: 50%; background: var(--accent); border: 0; }

.timeline-meta {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.transport {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 28px;
}
.icon-btn.big { padding: 10px 12px; }
.icon-btn .sub { font-size: 12px; font-variant-numeric: tabular-nums; }
.play-btn {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 0;
  background: var(--accent);
  color: var(--accent-ink);
  display: grid;
  place-items: center;
}
.play-btn svg { width: 30px; height: 30px; }
.play-btn:disabled { opacity: 0.4; }

.speed {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}
.speed input[type='range'] { flex: 1 1 140px; max-width: 320px; }
.step-btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: none;
  color: var(--text);
  font-size: 18px;
  line-height: 1;
}
#wpm-label { min-width: 70px; text-align: center; font-variant-numeric: tabular-nums; }
.toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--line);
  background: none;
  color: var(--muted);
  border-radius: 999px;
  padding: 6px 12px 6px 9px;
  font-size: 14px;
}
.toggle-btn svg { width: 18px; height: 18px; }
.toggle-btn[aria-pressed='true'] { color: var(--accent-ink); background: var(--accent); border-color: var(--accent); }
.toggle-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* Dialogs */
dialog {
  width: min(560px, calc(100% - 32px));
  max-height: calc(100dvh - 48px);
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 8px 20px 20px;
}
dialog::backdrop { background: rgba(0, 0, 0, 0.6); }
.dlg-head { display: flex; align-items: center; justify-content: space-between; margin: 0 -8px 0 0; }
dialog h2 { font-size: 18px; margin: 8px 0; }
dialog h3 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); margin: 18px 0 8px; font-weight: 600; }
dialog section + section { border-top: 1px solid var(--line); }
.hint { color: var(--muted); font-size: 13px; margin: 0 0 10px; }
details { color: var(--muted); font-size: 13px; margin-top: 10px; }
details summary { cursor: pointer; color: var(--text); }
details p { margin: 8px 0; }

textarea, select {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 16px; /* 16px stops iOS zooming on focus */
}
textarea { resize: vertical; }

.row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  background: var(--surface-2);
  color: var(--text);
  border-radius: 10px;
  padding: 9px 14px;
  text-decoration: none;
  font-size: 15px;
}
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
.btn.ghost { background: none; }
.btn.bookmarklet { border-style: dashed; color: var(--accent); cursor: grab; }
.file-btn { position: relative; overflow: hidden; cursor: pointer; }
.file-btn input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }

.seg { display: inline-flex; background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 3px; }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg span { display: block; padding: 6px 14px; border-radius: 8px; cursor: pointer; color: var(--muted); }
.seg input:checked + span { background: var(--surface-2); color: var(--text); }
.seg input:focus-visible + span { outline: 2px solid var(--accent); }

.library { list-style: none; padding: 0; margin: 0; }
.library li { display: flex; align-items: center; gap: 8px; border-top: 1px solid var(--line); }
.library li:first-child { border-top: 0; }
.library .open { flex: 1; min-width: 0; text-align: left; background: none; border: 0; padding: 12px 0; }
.library .t { display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.library .m { display: block; color: var(--muted); font-size: 12px; }
.library .bar { display: block; height: 3px; background: var(--line); border-radius: 2px; margin-top: 6px; overflow: hidden; }
.library .bar i { display: block; height: 100%; background: var(--accent); }
.library .current .t { color: var(--accent); }
.library .empty { color: var(--muted); padding: 12px 0; }

.toast {
  position: fixed;
  left: 50%;
  top: calc(56px + env(safe-area-inset-top));
  transform: translate(-50%, -10px);
  max-width: calc(100% - 32px);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 14px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 10;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

.drop-overlay {
  position: fixed;
  inset: 12px;
  border: 2px dashed var(--accent);
  border-radius: 16px;
  display: none;
  place-items: center;
  background: rgba(11, 12, 14, 0.85);
  font-size: 20px;
  z-index: 20;
  pointer-events: none;
}
.drop-overlay.show { display: grid; }

@media (max-height: 560px) {
  .context { min-height: 0; margin-top: 8px; font-size: 13px; }
  .play-btn { width: 52px; height: 52px; }
}