:root {
  --bg: #14161a;
  --panel: #1c1f25;
  --panel-2: #252931;
  --line: #333945;
  --text: #ece8df;
  --muted: #9aa1ad;
  --accent: #f5a623;
  --accent-ink: #1d1404;
  --accent-soft: rgba(245, 166, 35, 0.14);
  --good: #5fcf92;
  --good-soft: rgba(95, 207, 146, 0.14);
  --bad: #f07a6c;
  --bad-soft: rgba(240, 122, 108, 0.14);
  --lamp-off: #2a2e37;
  --pat-alt: #747b88;    /* the grey of every second letter in a displayed pattern */
  --radius: 12px;
  --mono: ui-monospace, "Cascadia Code", "SF Mono", Consolas, "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f2ea;
    --panel: #ffffff;
    --panel-2: #f1ede3;
    --line: #dcd5c5;
    --text: #24211b;
    --muted: #6a655a;
    --accent: #b96e00;
    --accent-ink: #ffffff;
    --accent-soft: rgba(185, 110, 0, 0.12);
    --good: #23824f;
    --good-soft: rgba(35, 130, 79, 0.12);
    --bad: #c2412d;
    --bad-soft: rgba(194, 65, 45, 0.1);
    --lamp-off: #e4dece;
    --pat-alt: #968f80;
    color-scheme: light;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 var(--sans);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, p { margin: 0; }
h1 { font-size: 1.7rem; line-height: 1.2; letter-spacing: -0.01em; text-wrap: balance; }
h2 { font-size: 1.05rem; }
a { color: var(--accent); }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

kbd {
  font: 0.72em var(--mono);
  padding: 1px 6px;
  border: 1px solid currentColor;
  border-radius: 5px;
  opacity: 0.7;
  margin-left: 4px;
}
.mono { font-family: var(--mono); }
.muted { color: var(--muted); }
.ok { color: var(--good); }
.no { color: var(--bad); }

/* ---------- top bar ---------- */

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  flex-wrap: wrap;
  max-width: 920px;
  margin: 0 auto;
  padding: 18px 20px 8px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  background: none;
  border: 0;
  padding: 0;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}
.brand-mark { display: inline-flex; gap: 4px; color: var(--accent); }
.brand-mark i { display: block; height: 7px; width: 18px; border-radius: 4px; background: currentColor; }
nav { display: flex; gap: 2px; flex-wrap: wrap; }
nav button {
  background: none;
  border: 0;
  padding: 7px 12px;
  border-radius: 8px;
  color: var(--muted);
}
nav button:hover { color: var(--text); }
nav button.active { color: var(--text); background: var(--panel-2); }

main {
  max-width: 920px;
  margin: 0 auto;
  padding: 16px 20px 80px;
}

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 9px 16px;
  border-radius: 9px;
  border: 1px solid var(--line);
  background: var(--panel-2);
}
.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 600; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.big { padding: 13px 22px; font-size: 1.02rem; }
.btn.small { padding: 5px 11px; font-size: 0.88rem; }
.btn.ghost { background: none; border-color: transparent; color: var(--muted); padding-left: 0; }
.btn.ghost:hover { color: var(--text); }
.btn.danger { color: var(--bad); }
.btn:disabled { opacity: 0.45; }

.row { display: flex; gap: 10px; justify-content: center; align-items: center; flex-wrap: wrap; margin-top: 16px; }
.row.left { justify-content: flex-start; }

/* ---------- morse pattern glyphs ---------- */

.pat { display: inline-flex; align-items: center; gap: 4px; vertical-align: middle; }
.pat i { display: block; height: 7px; border-radius: 4px; background: currentColor; }
.pat .dit { width: 7px; }
.pat .dah { width: 21px; }
.pat-gap { display: inline-block; width: 14px; }
/* Alternate letters of an answer: full-strength, then grey. */
.pat.shade-a { color: var(--text); }
.pat.shade-b { color: var(--pat-alt); }

/* Picture mnemonic: a faint letter with its marks on its strokes; marks light as they sound. */
.mnemo { display: block; flex: none; }
.mn-sk { fill: none; stroke: var(--muted); stroke-opacity: 0.3; stroke-width: 9; stroke-linecap: round; stroke-linejoin: round; }
circle.mn-el { fill: var(--text); }
.mn-dash { fill: none; stroke: var(--text); stroke-width: 11; stroke-linecap: round; }
circle.mn-el.lit { fill: var(--accent); }
.mn-dash.lit { stroke: var(--accent); }
.mn-el.lit { filter: drop-shadow(0 0 5px var(--accent)); }
.card.pic { padding: 10px; }
.hint .mnemo { margin-right: 14px; }

/* A prosign: letters keyed as one character, written with a line over them. */
.pro { text-decoration: overline; text-decoration-thickness: 0.07em; letter-spacing: 0; }

/* ---------- learn ---------- */

.hero {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 28px;
  align-items: center;
  padding: 28px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.hero-text p { color: var(--muted); margin: 10px 0 20px; max-width: 54ch; }
.hero-stats { margin: 0; display: grid; gap: 14px; min-width: 170px; }
.hero-stats div { border-left: 3px solid var(--accent); padding-left: 12px; }
.hero-stats dt { font-size: 0.8rem; color: var(--muted); }
.hero-stats dd { margin: 0; font: 600 1.5rem/1.2 var(--mono); font-variant-numeric: tabular-nums; }
.hero-stats small { font-size: 0.8rem; color: var(--muted); font-weight: 400; }

.units { display: grid; gap: 14px; margin-top: 18px; }
.part { margin: 14px 2px 0; font-size: 0.82rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
.unit {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
}
.unit.locked { opacity: 0.55; }
.unit-head { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.unit-no { font: 600 0.78rem var(--mono); color: var(--accent); text-transform: uppercase; letter-spacing: 0.08em; }
.unit header p { color: var(--muted); margin-top: 4px; }
.unit header .unit-meta { font-size: 0.82rem; }
.badge {
  margin-left: auto;
  font-size: 0.78rem;
  padding: 2px 10px;
  border-radius: 99px;
  background: var(--panel-2);
  color: var(--muted);
}
.badge.good { background: var(--good-soft); color: var(--good); }

.lessons { display: grid; grid-template-columns: max-content 1fr; gap: 8px 16px; align-items: center; margin-top: 14px; }
.lesson { display: contents; }
.lesson-chars { font: 600 1.05rem var(--mono); min-width: 56px; letter-spacing: 0.04em; }
.lesson-steps { display: flex; gap: 8px; flex-wrap: wrap; }
.step {
  padding: 6px 14px;
  border-radius: 99px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  font-size: 0.9rem;
}
.step:hover:not(:disabled) { border-color: var(--muted); }
.step:disabled { opacity: 0.45; }
.step.done { border-color: transparent; background: var(--good-soft); color: var(--good); }
.step.now { border-color: var(--accent); background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.tick { margin-right: 5px; }

/* ---------- drill ---------- */

.run { max-width: 680px; margin: 0 auto; }
.run-head { display: flex; align-items: center; gap: 14px; min-height: 44px; }
.run-title { display: flex; flex-direction: column; line-height: 1.3; }
.run-title span { font-size: 0.82rem; color: var(--muted); }
.run-head .btn, .run-count { flex: none; white-space: nowrap; }
#backBtn { margin-left: auto; }
#backBtn + .run-count { margin-left: 0; }
.run-count { margin-left: auto; font: 0.9rem var(--mono); color: var(--muted); font-variant-numeric: tabular-nums; }
.progress { height: 5px; background: var(--panel-2); border-radius: 3px; margin-top: 10px; overflow: hidden; }
.progress i { display: block; height: 100%; width: 0; background: var(--accent); transition: width 0.25s; }

.stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 30px 0 8px;
}
.stage.compact { padding: 18px 0 0; }

.lamp {
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: var(--lamp-off);
  border: 2px solid var(--line);
}
.lamp.small { width: 30px; height: 30px; }
.lamp.on {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 0 6px var(--accent-soft), 0 0 34px 6px var(--accent);
}

.card {
  min-width: 150px;
  min-height: 150px;
  padding: 0 28px;
  display: grid;
  place-items: center;
  background: var(--panel);
  border: 2px solid var(--line);
  border-radius: 18px;
  font: 600 5.2rem/1 var(--mono);
}
.card.word { font-size: 2.6rem; min-height: 110px; letter-spacing: 0.08em; overflow-wrap: anywhere; text-align: center; }
.card.word.long { font-size: 1.3rem; line-height: 1.6; letter-spacing: 0.05em; min-height: 0; padding: 18px 24px; max-width: 100%; }
.card.prompt { font: 500 1.12rem/1.5 var(--sans); min-height: 0; padding: 20px 26px; max-width: 540px; text-align: center; text-wrap: balance; }
.card.good { border-color: var(--good); color: var(--good); background: var(--good-soft); }
.card.bad { border-color: var(--bad); color: var(--bad); background: var(--bad-soft); }

.hint { min-height: 20px; color: var(--muted); display: flex; flex-wrap: wrap; justify-content: center; row-gap: 8px; }
.hint-tx { font: 600 1.05rem var(--mono); letter-spacing: 0.06em; text-align: center; overflow-wrap: anywhere; }
.spoken { color: var(--muted); font-style: italic; }
.meaning { display: grid; gap: 2px; text-align: center; max-width: 46ch; }
.meaning span { color: var(--muted); font-size: 0.88rem; }
.fb { text-align: center; min-height: 3.2em; margin: 8px 0 14px; color: var(--muted); }
.fb .btn { margin-left: 6px; }
.gloss { display: block; margin-top: 2px; color: var(--text); }
.fb b { color: var(--text); font-family: var(--mono); }

.choices { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.choice {
  width: 50px;
  height: 50px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--panel);
  font: 600 1.25rem var(--mono);
}
.choice:hover { border-color: var(--accent); }
.choice.right { background: var(--good-soft); border-color: var(--good); color: var(--good); }
.choice.wrong { background: var(--bad-soft); border-color: var(--bad); color: var(--bad); }

.choices.wide { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); }
.choices.wide .choice {
  width: auto;
  height: auto;
  padding: 9px 12px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0 10px;
  align-items: center;
  text-align: left;
}
.choices.wide kbd { grid-row: span 2; margin: 0; }
.choices.wide kbd.none { visibility: hidden; }
.choices.wide small { font: 400 0.78rem var(--sans); color: var(--muted); grid-column: 2; }
.choices.wide .choice.right small, .choices.wide .choice.wrong small { color: inherit; }

.options { display: grid; gap: 8px; }
.option {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  text-align: left;
}
.option kbd { margin: 0; flex: none; }
.option:hover { border-color: var(--accent); }
.option.right { background: var(--good-soft); border-color: var(--good); color: var(--good); }
.option.wrong { background: var(--bad-soft); border-color: var(--bad); color: var(--bad); }

.word-input.long { width: min(100%, 520px); font-size: 1.02rem; letter-spacing: 0.04em; }
.word-input {
  width: min(100%, 260px);
  padding: 10px 14px;
  border-radius: 9px;
  border: 1px solid var(--line);
  background: var(--panel);
  font: 600 1.3rem var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ---------- key pad ---------- */

.keying { margin-top: 14px; display: grid; gap: 10px; }
.pad {
  width: 100%;
  padding: 26px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  border-radius: 14px;
  border: 2px dashed var(--line);
  background: var(--panel);
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}
.pad:hover { border-color: var(--muted); }
.pad.down { border-style: solid; border-color: var(--accent); background: var(--accent-soft); }
.pad.paddle, .pad.paddle:hover, .pad.paddle.down {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  padding: 0;
  border: 0;
  background: none;
}
.pad-half {
  padding: 22px 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  border-radius: 14px;
  border: 2px dashed var(--line);
  background: var(--panel);
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}
.pad-half:hover { border-color: var(--muted); }
.pad-half.on { border-style: solid; border-color: var(--accent); background: var(--accent-soft); }
.pad-half kbd { margin: 0 2px; }
.pad-note { margin: 0; text-align: center; font-size: 0.82rem; color: var(--muted); }
.pad-main { font-weight: 600; }
.pad-sub { font-size: 0.82rem; color: var(--muted); }

.tape {
  height: 30px;
  padding: 0 12px;
  display: flex;
  align-items: center;
  gap: 5px;
  overflow: hidden;
  background: var(--panel-2);
  border-radius: 8px;
}
.tape i { display: block; flex: none; height: 9px; border-radius: 5px; background: var(--accent); }
.tape b { display: block; flex: none; width: 14px; }
.decoded { min-height: 1.8em; text-align: center; font: 600 1.15rem var(--mono); letter-spacing: 0.12em; }
.decoded .pat { letter-spacing: 0; }

.free-out {
  min-height: 110px;
  margin-top: 14px;
  padding: 14px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 1.3rem;
  letter-spacing: 0.1em;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

/* ---------- listen and decode ---------- */

.mic-panel { display: flex; align-items: center; gap: 12px 16px; flex-wrap: wrap; margin-top: 16px; }
.meter { flex: 1 1 160px; height: 10px; border-radius: 5px; background: var(--panel-2); overflow: hidden; }
.meter i { display: block; height: 100%; width: 0; background: var(--muted); }
.meter i.live { background: var(--accent); }
.mic-stat { font: 0.85rem var(--mono); color: var(--muted); font-variant-numeric: tabular-nums; }
#micOut { max-height: 45vh; overflow-y: auto; }
.mic-partial { color: var(--muted); }
.mic-note { margin-top: 16px; font-size: 0.88rem; max-width: 68ch; }

/* ---------- text to Morse ---------- */

.conv-in {
  display: block;
  width: 100%;
  margin-top: 14px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: inherit;
  font: 1.05rem/1.5 var(--mono);
  resize: vertical;
}
.conv-out {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 10px 4px;
  min-height: 78px;
  max-height: 40vh;
  overflow-y: auto;
  margin-top: 12px;
  padding: 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.conv-ch { display: flex; flex-direction: column; align-items: center; gap: 7px; min-width: 30px; padding: 6px 7px; border-radius: 8px; }
.conv-ch b { font: 600 1.15rem/1 var(--mono); }
.conv-ch.now { background: var(--accent-soft); box-shadow: inset 0 0 0 1px var(--accent); }
.conv-ch.bad { color: var(--bad); }
.conv-ch small { font-size: 0.62rem; line-height: 1; }
.conv-gap { flex: none; width: 18px; }
.free-out.conv-code { min-height: 0; font-size: 1rem; letter-spacing: 0.14em; }
.free-out.conv-code:empty { display: none; }

/* ---------- results ---------- */

.results { max-width: 680px; margin: 0 auto; text-align: center; padding-top: 14px; }
.results > p { margin-top: 6px; color: var(--muted); }
.results h1 { margin-top: 18px; }
.results h2 { margin: 34px 0 10px; text-align: left; }
.score {
  width: 168px;
  height: 168px;
  margin: 0 auto;
  border-radius: 50%;
  border: 6px solid var(--line);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: 0.85rem;
}
.score .pct { font: 700 3rem/1.1 var(--mono); color: var(--text); font-variant-numeric: tabular-nums; }
.score .pct small { font-size: 1.2rem; }
.score.good { border-color: var(--good); }
.score.good .pct { color: var(--good); }
.score.bad { border-color: var(--bad); }

.table-wrap { overflow-x: auto; }
.missed { width: 100%; border-collapse: collapse; text-align: left; }
.missed th { font-size: 0.78rem; font-weight: 500; color: var(--muted); padding: 6px 10px; border-bottom: 1px solid var(--line); }
.missed td { padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; overflow-wrap: anywhere; }
.missed td:first-child { white-space: nowrap; }
.asked { font: 400 0.8rem/1.4 var(--sans); letter-spacing: 0; color: var(--muted); max-width: 40ch; margin-top: 2px; }
.missed .mono { font-weight: 600; letter-spacing: 0.06em; }
.missed td:last-child { text-align: right; }

/* ---------- panels (practice, reference, method, settings) ---------- */

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
}
.panel h2 { margin: 28px 0 10px; }
.panel > .muted { margin-top: 8px; max-width: 68ch; }
.panel > .btn.big { margin-top: 24px; }

.modes { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 10px; margin-top: 20px; }
.mode {
  display: flex;
  flex-direction: column;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel-2);
  cursor: pointer;
}
.mode span { font-size: 0.85rem; color: var(--muted); }
.mode input { position: absolute; opacity: 0; pointer-events: none; }
.mode.sel { border-color: var(--accent); background: var(--accent-soft); }
.mode:focus-within { outline: 2px solid var(--accent); outline-offset: 2px; }

.fields { display: grid; gap: 16px; margin-top: 18px; max-width: 460px; }
.field { display: grid; gap: 5px; }
.field-label { font-size: 0.88rem; font-weight: 600; }
.field small { color: var(--muted); font-size: 0.82rem; }
.field-ctl { display: flex; align-items: center; gap: 12px; }
.field-ctl input { flex: 1; accent-color: var(--accent); }
.field-ctl output { font: 0.9rem var(--mono); min-width: 74px; text-align: right; font-variant-numeric: tabular-nums; }
.field select {
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--panel-2);
}
.field.check { display: flex; align-items: center; gap: 10px; }
.field.check input { width: 18px; height: 18px; accent-color: var(--accent); flex: none; }

.legend { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; font-size: 0.82rem; color: var(--muted); margin-top: 14px; }
.legend .key { width: 12px; height: 12px; border-radius: 3px; margin-left: 10px; }
.legend .key:first-child { margin-left: 0; }
.key.strong { background: var(--good); }
.key.fair { background: var(--accent); }
.key.weak { background: var(--bad); }

.tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(118px, 1fr)); gap: 10px; }
.tile {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--line);
  border-radius: 10px;
  background: var(--panel-2);
  text-align: left;
}
.tile:hover { border-color: var(--muted); }
.tile.strong { border-left-color: var(--good); }
.tile.fair { border-left-color: var(--accent); }
.tile.weak { border-left-color: var(--bad); }
.tile-ch { font: 600 1.5rem/1 var(--mono); }
.tile .pat { color: var(--muted); min-height: 7px; }
.tile-stat { font-size: 0.72rem; color: var(--muted); }
.tile-mean { font-size: 0.82rem; }
.tiles.wide { grid-template-columns: repeat(auto-fill, minmax(168px, 1fr)); }

/* ---------- briefings ---------- */

.brief h1 { margin-top: 8px; }
.brief-lamp {
  position: sticky;
  top: 0;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  margin-top: 8px;
  background: var(--panel);
  font-size: 0.85rem;
}
.ex {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  max-width: 68ch;
  margin-top: 10px;
  padding: 10px 12px;
  background: var(--panel-2);
  border-radius: 10px;
}
.ex .btn { flex: none; width: 36px; }
.ex-tx { font-weight: 600; letter-spacing: 0.05em; overflow-wrap: anywhere; }
.ex-note { font-size: 0.85rem; color: var(--muted); }
.brief .row { margin-top: 28px; }

.prose p, .prose ul { max-width: 68ch; }
.prose h2 { margin-bottom: 6px; }
.prose p + p { margin-top: 10px; }
.prose .address { padding-left: 14px; border-left: 3px solid var(--line); }
.prose .row { margin: 14px 0; }
.prose ul { padding-left: 20px; margin: 0; }
.prose li { margin: 4px 0; }

/* ---------- small screens ---------- */

@media (max-width: 640px) {
  .top { padding: 14px 16px 4px; }
  nav { margin: 0 -8px; }
  nav button { padding: 6px 8px; font-size: 0.92rem; }
  main { padding: 12px 16px 64px; }
  .hero { grid-template-columns: 1fr; padding: 22px; }
  .hero-stats { grid-template-columns: repeat(3, 1fr); min-width: 0; }
  .panel { padding: 20px; }
  .unit { padding: 16px; }
  .card { font-size: 4.2rem; min-width: 120px; min-height: 120px; }
  .card.word { font-size: 1.9rem; }
  .choice { width: 44px; height: 44px; }
  .badge { margin-left: 0; }
}

/* ---------- phones and touch ---------- */

html { touch-action: manipulation; -webkit-text-size-adjust: 100%; }   /* no double-tap zoom */
body { -webkit-tap-highlight-color: transparent; }
.pad, .pad-half { -webkit-touch-callout: none; }                        /* no long-press menu on the key */

/* Notches and rounded corners when installed full-screen. */
.top { padding-top: max(18px, env(safe-area-inset-top)); }
.top, main {
  padding-left: max(20px, env(safe-area-inset-left));
  padding-right: max(20px, env(safe-area-inset-right));
}

/* Small or short screens: a compact stage, and the key stays pinned to the bottom of the screen. */
@media (max-width: 640px), (max-height: 720px) {
  .top, main {
    padding-left: max(16px, env(safe-area-inset-left));
    padding-right: max(16px, env(safe-area-inset-right));
  }
  nav { flex-wrap: nowrap; overflow-x: auto; }
  body.in-lesson .top { display: none; }
  body.in-lesson main { padding-top: max(12px, env(safe-area-inset-top)); }
  .stage { padding: 12px 0 4px; gap: 10px; }
  .lamp { width: 40px; height: 40px; }
  .card { font-size: 3.4rem; min-width: 104px; min-height: 104px; }
  .card.word { font-size: 1.9rem; min-height: 84px; }
  .card.word.long { font-size: 1.15rem; }
  .card.prompt { font-size: 1.02rem; padding: 14px 18px; }
  .card.pic .mnemo { width: 112px; height: 112px; }
  .fb { min-height: 2.6em; margin: 6px 0 10px; }
  .pad { padding: 20px 12px; }
  .pad-half { padding: 20px 8px; }
  .keying {
    position: sticky;
    bottom: 0;
    z-index: 2;
    margin: 8px -16px 0;
    padding: 8px 16px calc(8px + env(safe-area-inset-bottom));
    background: var(--bg);
    box-shadow: 0 -10px 12px -10px rgba(0, 0, 0, 0.3);
  }
}

/* Touch-only devices: bigger targets, and no keyboard shortcut labels. */
@media (hover: none) and (pointer: coarse) {
  kbd { display: none; }
  .step { padding: 10px 16px; }
  nav button { padding: 10px; }
  .btn.small { padding: 9px 14px; }
  .choice { width: 48px; height: 48px; }
  .choices.wide .choice { grid-template-columns: 1fr; width: auto; height: auto; }
  .choices.wide small { grid-column: 1; }
}

/* ---------- footer and privacy notice ---------- */

.site-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  justify-content: center;
  max-width: 920px;
  margin: 0 auto;
  padding: 0 20px max(28px, env(safe-area-inset-bottom));
  font-size: 0.85rem;
  color: var(--muted);
}
.site-foot a { color: inherit; }
.site-foot a:hover, .foot-link:hover { color: var(--text); }
.foot-link { padding: 0; border: 0; background: none; color: inherit; font: inherit; text-decoration: underline; }
main { padding-bottom: 40px; }

.notice {
  position: fixed;
  left: 50%;
  bottom: max(14px, env(safe-area-inset-bottom));
  transform: translateX(-50%);
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 12px 18px;
  flex-wrap: wrap;
  width: min(680px, calc(100% - 28px));
  padding: 12px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.28);
  font-size: 0.9rem;
}
.notice p { flex: 1 1 260px; }
.notice-btns { display: flex; gap: 8px; margin-left: auto; }

/* During a lesson on a small screen the key pad owns the bottom of the screen. */
@media (max-width: 640px), (max-height: 720px) {
  body.in-lesson .site-foot, body.in-lesson .notice { display: none; }
}