:root {
  --bg: #fffdf7;
  --fg: #1d2433;
  --muted: #566074;
  --accent: #1b5fd1;
  --accent-fg: #ffffff;
  --ok: #167a3e;
  --bad: #b3261e;
  --card: #ffffff;
  --border: #c9d1e0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161f;
    --fg: #eef1f8;
    --muted: #a3adc2;
    --accent: #6ea0ff;
    --accent-fg: #0b1220;
    --ok: #5ed38a;
    --bad: #ff8a80;
    --card: #1b2130;
    --border: #38415a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 20px/1.5 system-ui, "Segoe UI", sans-serif;
}
main { max-width: 640px; margin: 0 auto; padding: 24px 16px 48px; }
h1, h2 { margin: 0 0 8px; }
.stack { display: grid; gap: 12px; margin-top: 16px; }
.row { display: flex; gap: 12px; margin-top: 16px; flex-wrap: wrap; }
.topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; color: var(--muted); }
button {
  font: inherit;
  min-height: 52px;
  padding: 10px 20px;
  border-radius: 14px;
  border: 2px solid var(--border);
  background: var(--card);
  color: var(--fg);
  cursor: pointer;
}
button:focus-visible, input:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
button.big { width: 100%; min-height: 96px; font-size: 1.6rem; background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
button.primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
button.secondary { width: 100%; margin-top: 12px; }
.row button.secondary { width: auto; margin-top: 0; }
button.link { border: 0; background: none; text-decoration: underline; min-height: 44px; padding: 0; color: var(--accent); }
input#answer {
  width: 100%;
  margin-top: 20px;
  font: inherit;
  font-size: 1.4rem;
  padding: 14px 16px;
  border-radius: 14px;
  border: 2px solid var(--border);
  background: var(--card);
  color: var(--fg);
}
.speeds { display: flex; gap: 12px; margin-top: 12px; }
.speeds button.secondary { flex: 1 1 0; width: auto; min-width: 0; margin-top: 0; min-height: 60px; }
.letters { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 12px; }
.letters button { flex: 0 0 auto; min-width: 44px; min-height: 48px; padding: 0 8px; font-size: 1.25rem; }
.note { color: var(--muted); font-size: 0.85rem; margin: 8px 0 0; }
#feedback { margin-top: 20px; font-size: 1.15rem; }
#feedback .ok { color: var(--ok); font-weight: 700; }
#feedback .bad { color: var(--bad); font-weight: 700; }
.words { display: flex; flex-wrap: wrap; gap: 6px 12px; margin-top: 10px; font-size: 1.3rem; }
.word.ok { color: var(--ok); }
.word.bad { color: var(--bad); }
.letter.miss { color: var(--bad); text-decoration: underline; text-decoration-thickness: 3px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }
.choice { display: grid; gap: 10px; margin-top: 8px; }
.choice button { min-height: 56px; text-align: left; }
.choice button[aria-pressed="true"], .letters button[aria-pressed="true"] { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
h3 { margin: 20px 0 0; font-size: 1.05rem; color: var(--muted); }
.bad-msg { color: var(--bad); font-weight: 700; margin: 8px 0; min-height: 1.5em; }
#btn-start { margin-top: 12px; }
#btn-showtext { margin-top: 16px; }
.sentence-text { font-size: 1.5rem; margin: 12px 0 0; }
[hidden] { display: none !important; }
.letters button.cmd { border-style: dashed; font-weight: 600; }
.letters button.cmd-space { min-width: 110px; }
.letters button.cmd-enter { margin-left: auto; }
.letters button.cmd:disabled { opacity: 0.4; }