/* NATO Phonetic Alphabet Trainer — styles.css
   Mobile-first. "Signals" identity: teal accent, amber secondary, technical
   monospace micro-labels, Space Grotesk display type. Light + dark via
   prefers-color-scheme. Micro-animations only, guarded by prefers-reduced-motion. */

:root {
  /* accent (signal teal) */
  --accent: #17b3ac;
  --accent-strong: #0e9f9f;
  --accent-deep: #0a7f7f;
  --accent-bright: #35d6cd;
  --accent-soft: rgba(23, 179, 172, 0.14);

  /* secondary (amber — streaks, mastery) */
  --amber: #eaa829;
  --amber-soft: rgba(234, 168, 41, 0.14);

  --bg: #eef2f2;
  --bg-grid: rgba(16, 26, 30, 0.035);
  --surface: #ffffff;
  --surface-2: #e9eeed;
  --surface-3: #dfe6e5;
  --text: #10191d;
  --text-dim: #566369;
  --text-faint: #88959a;
  --border: #d7e0df;
  --border-strong: #c3cfcd;
  --shadow: 0 1px 2px rgba(20, 40, 45, 0.05), 0 8px 24px rgba(20, 40, 45, 0.07);
  --shadow-sm: 0 1px 3px rgba(20, 40, 45, 0.08);

  /* mastery categories */
  --cat-locked: #cdd6d5;
  --cat-unseen: #b9c4c3;
  --cat-weak: #e5533c;
  --cat-learning: #eaa829;
  --cat-strong: #21ab6b;
  --cat-mastered: #e0b32e;

  --good: #1f9e57;
  --bad: #d9462f;

  --radius: 18px;
  --radius-sm: 12px;
  --radius-xs: 8px;
  --tap: 48px;
  --maxw: 640px;

  --font-display: "Space Grotesk", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a1214;
    --bg-grid: rgba(120, 200, 200, 0.03);
    --surface: #10191c;
    --surface-2: #172327;
    --surface-3: #1e2d32;
    --text: #e9f1f1;
    --text-dim: #93a4a8;
    --text-faint: #6a7d81;
    --border: #223236;
    --border-strong: #2c4045;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 10px 30px rgba(0, 0, 0, 0.45);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
    --accent-soft: rgba(23, 179, 172, 0.16);
    --amber-soft: rgba(234, 168, 41, 0.16);
    --cat-locked: #26363b;
    --cat-unseen: #33474d;
  }
}
/* Explicit theme overrides win over the media query in both directions. */
:root[data-theme="light"] {
  --bg: #eef2f2; --bg-grid: rgba(16,26,30,0.035); --surface: #fff; --surface-2: #e9eeed; --surface-3: #dfe6e5;
  --text: #10191d; --text-dim: #566369; --border: #d7e0df; --border-strong: #c3cfcd;
  --cat-locked: #cdd6d5; --cat-unseen: #b9c4c3;
}
:root[data-theme="dark"] {
  --bg: #0a1214; --bg-grid: rgba(120,200,200,0.03); --surface: #10191c; --surface-2: #172327; --surface-3: #1e2d32;
  --text: #e9f1f1; --text-dim: #93a4a8; --border: #223236; --border-strong: #2c4045;
  --cat-locked: #26363b; --cat-unseen: #33474d;
}

* { box-sizing: border-box; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; border: 0;
  overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%);
  white-space: nowrap;
}

html, body { height: 100%; }

body {
  margin: 0;
  background-color: var(--bg);
  background-image:
    linear-gradient(var(--bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
  background-size: 26px 26px;
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.45;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent-strong);
  color: #fff;
  padding: 8px 14px;
  border-radius: 0 0 8px 0;
  z-index: 100;
}
.skip-link:focus { left: 0; }

/* ---- top bar ---- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  padding-top: max(10px, env(safe-area-inset-top));
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.topbar-title {
  flex: 1;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  text-align: center;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.icon-btn {
  min-width: var(--tap);
  min-height: var(--tap);
  border: none;
  background: transparent;
  color: var(--text);
  font-size: 1.35rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}
.icon-btn:hover { background: var(--surface-2); color: var(--accent-strong); }
.icon-btn[hidden] { visibility: hidden; display: inline-flex; }

/* ---- layout ---- */
.app {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px 16px 44px;
  outline: none;
}
.screen { animation: fade 0.22s ease; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
  margin-bottom: 16px;
}
.section-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 8px;
}
.section-title::before {
  content: "";
  width: 7px; height: 7px;
  border-radius: 2px;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
  flex: none;
}
.muted { color: var(--text-dim); }
.small { font-size: 0.85rem; }

/* ---- buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: var(--tap);
  padding: 12px 18px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font-body);
  cursor: pointer;
  text-align: center;
  transition: transform 0.08s ease, background 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}
.btn:active { transform: translateY(1px); }
.btn:hover { background: var(--surface-2); border-color: var(--accent); }
.btn.primary {
  background: linear-gradient(180deg, var(--accent), var(--accent-strong));
  border-color: var(--accent-strong);
  color: #fff;
  box-shadow: 0 2px 12px rgba(14, 159, 159, 0.28);
}
.btn.primary:hover {
  background: linear-gradient(180deg, var(--accent-bright), var(--accent));
  border-color: var(--accent);
}
.btn.block { width: 100%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; box-shadow: none; }
.btn:disabled:hover { background: var(--surface); border-color: var(--border-strong); }
.btn:focus-visible, .icon-btn:focus-visible, .tile:focus-visible,
input:focus-visible, .choice:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.mode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.mode-btn {
  flex-direction: column;
  gap: 6px;
  min-height: 108px;
  font-size: 1.02rem;
  font-weight: 700;
  border-radius: var(--radius);
  padding: 16px 12px;
  position: relative;
  overflow: hidden;
}
.mode-btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 90% at 50% -20%, var(--accent-soft), transparent 60%);
  opacity: 0;
  transition: opacity 0.2s ease;
  pointer-events: none;
}
.mode-btn:hover::after { opacity: 1; }
.mode-btn .emoji {
  font-size: 1.7rem;
  filter: saturate(0.9);
}
.mode-btn .hint {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.mode-btn.primary .hint { color: rgba(255, 255, 255, 0.82); }
.mode-btn:disabled .hint { color: var(--bad); text-transform: none; letter-spacing: 0; }

/* ---- home: rings + level ---- */
.home-top {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: center;
}
.ring-wrap { display: flex; gap: 14px; flex: none; }
.ring {
  --pct: 0;
  --ring-color: var(--accent);
  width: 86px;
  height: 86px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background:
    radial-gradient(closest-side, var(--surface) 71%, transparent 73% 100%),
    conic-gradient(var(--ring-color) calc(var(--pct) * 1%), var(--surface-2) 0);
  text-align: center;
  position: relative;
}
.ring::after {
  content: "";
  position: absolute;
  inset: 6px;
  border-radius: 50%;
  border: 1px solid var(--border);
}
.ring .ring-num { font-family: var(--font-display); font-size: 1.35rem; font-weight: 700; line-height: 1; }
.ring .ring-lbl { font-family: var(--font-mono); font-size: 0.55rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.12em; margin-top: 2px; }
.flame { font-size: 1rem; }

.level-bar { margin-top: 4px; flex: 1 1 220px; min-width: 0; }
.level-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 4px 10px; margin-bottom: 8px; }
.rank-name { font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; letter-spacing: 0.01em; }
.level-head .muted { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.03em; }
.level-track {
  height: 12px;
  background: var(--surface-2);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.level-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent-bright), var(--accent-strong));
  border-radius: 999px;
  transition: width 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}
.level-bar .muted.small { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.02em; }

/* ---- mastery grid ---- */
.grid-legend { display: flex; flex-wrap: wrap; gap: 8px 14px; margin-top: 14px; }
.legend-item { display: inline-flex; align-items: center; gap: 6px; font-family: var(--font-mono); font-size: 0.64rem; letter-spacing: 0.04em; text-transform: uppercase; color: var(--text-dim); }
.legend-swatch { width: 11px; height: 11px; border-radius: 3px; }

.alpha-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(48px, 1fr));
  gap: 8px;
}
.tile {
  aspect-ratio: 1 / 1;
  min-height: 48px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: #10191d;
  cursor: pointer;
  display: grid;
  place-items: center;
  position: relative;
  transition: transform 0.12s ease, box-shadow 0.15s ease, filter 0.15s ease;
}
.tile:not([data-cat="locked"]):hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
  filter: brightness(1.05);
}
.tile[data-cat="locked"] { background: var(--cat-locked); color: var(--text-faint); cursor: default; border-color: transparent; }
.tile[data-cat="unseen"] { background: var(--cat-unseen); color: #3c474b; border-color: transparent; }
.tile[data-cat="weak"] { background: var(--cat-weak); color: #fff; border-color: transparent; }
.tile[data-cat="learning"] { background: var(--cat-learning); color: #3a2a00; border-color: transparent; }
.tile[data-cat="strong"] { background: var(--cat-strong); color: #fff; border-color: transparent; }
.tile[data-cat="mastered"] { background: var(--cat-mastered); color: #3a2c00; box-shadow: inset 0 0 0 2px rgba(255,255,255,0.4); border-color: transparent; }
.tile .lock { position: absolute; top: 3px; right: 5px; font-size: 0.58rem; opacity: 0.7; }

/* letter detail popover */
.detail {
  margin-top: 14px;
  padding: 16px;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  border: 1px solid var(--border);
}
.detail h3 { margin: 0 0 4px; font-family: var(--font-display); font-size: 1.2rem; }
.detail h3 .muted { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.04em; }
.detail .stat-row { display: flex; flex-wrap: wrap; gap: 6px 16px; margin: 10px 0 14px; font-size: 0.85rem; }
.detail .stat-row strong { font-family: var(--font-mono); }

/* ---- learn / flashcard ---- */
.flash {
  text-align: center;
  padding: 28px 16px;
}
.flash .big-letter { font-family: var(--font-display); font-size: min(30vw, 200px); font-weight: 700; line-height: 1; color: var(--accent-strong); letter-spacing: -0.02em; }
.flash .word { font-family: var(--font-display); font-size: 2.1rem; font-weight: 700; margin-top: 4px; }
.flash .pron { font-family: var(--font-mono); color: var(--text-dim); letter-spacing: 0.12em; margin-top: 4px; font-size: 0.95rem; }
.flash .mnemonic { margin-top: 14px; color: var(--text-dim); max-width: 34ch; margin-inline: auto; text-wrap: pretty; }
.flash-nav { display: flex; justify-content: space-between; gap: 10px; margin-top: 16px; }
.flash-nav .btn { flex: 1; }
.flash-progress { font-family: var(--font-mono); text-align: center; color: var(--text-faint); font-size: 0.75rem; letter-spacing: 0.1em; margin-top: 12px; }

/* ---- quiz shell ---- */
.quiz-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 14px;
}
.dots { display: flex; gap: 5px; flex-wrap: wrap; }
.dot {
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--surface-2);
  border: 1px solid var(--border-strong);
  transition: transform 0.15s ease;
}
.dot.done-correct { background: var(--good); border-color: var(--good); }
.dot.done-wrong { background: var(--bad); border-color: var(--bad); }
.dot.current { box-shadow: 0 0 0 3px var(--accent-soft); border-color: var(--accent); transform: scale(1.15); }
.quiz-meta { display: flex; gap: 16px; font-family: var(--font-mono); font-weight: 600; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-dim); }
.quiz-meta strong { font-family: var(--font-display); font-size: 1.05rem; color: var(--text); margin-left: 4px; letter-spacing: 0; }
.quiz-meta .streak-num.hot { color: var(--amber); }

.hero {
  text-align: center;
  margin: 10px 0 22px;
  position: relative;
}
.hero::before {
  content: "IDENTIFY";
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 2px;
}
.hero-letter {
  font-family: var(--font-display);
  font-size: 40vw;
  font-weight: 700;
  line-height: 0.92;
  color: var(--accent-strong);
  letter-spacing: -0.03em;
  text-shadow: 0 8px 40px var(--accent-soft);
}
@media (min-width: 560px) {
  .hero-letter { font-size: 220px; }
}

.answer-area { min-height: 120px; }
.choices { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.choice {
  position: relative;
  min-height: 64px;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
}
.choice .kbd {
  position: absolute; top: 7px; left: 9px;
  font-family: var(--font-mono);
  font-size: 0.62rem; color: var(--text-faint); font-weight: 600;
}
.choice.correct { background: var(--good); border-color: var(--good); color: #fff; box-shadow: 0 2px 14px rgba(31,158,87,0.3); }
.choice.wrong { background: var(--bad); border-color: var(--bad); color: #fff; }
.choice:disabled { opacity: 1; }

.type-form { display: flex; flex-direction: column; gap: 12px; }
.type-input {
  width: 100%;
  min-height: 58px;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  text-align: center;
  padding: 10px 14px;
  border: 2px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.type-input:focus { border-color: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); outline: none; }

.voice-area { text-align: center; }
.mic-btn {
  width: 124px; height: 124px;
  border-radius: 50%;
  font-size: 2.4rem;
  margin: 0 auto;
  border: 3px solid var(--accent);
  background: var(--accent-soft);
  color: var(--accent-strong);
  transition: transform 0.12s ease, background 0.15s ease, box-shadow 0.2s ease;
}
.mic-btn:hover { background: var(--accent-soft); box-shadow: 0 0 0 8px var(--accent-soft); }
.mic-btn.listening { background: var(--accent); color: #fff; box-shadow: 0 0 0 10px var(--accent-soft); animation: micPulse 1.1s ease-in-out infinite; }
.mic-hint { font-family: var(--font-mono); margin-top: 14px; color: var(--text-dim); font-size: 0.82rem; letter-spacing: 0.04em; }

/* feedback */
.feedback {
  margin-top: 18px;
  padding: 16px;
  border-radius: var(--radius);
  text-align: center;
  border: 1px solid var(--border);
  background: var(--surface-2);
  animation: fade 0.2s ease;
}
.feedback.ok { border-color: var(--good); background: color-mix(in srgb, var(--good) 8%, var(--surface)); }
.feedback.no { border-color: var(--bad); background: color-mix(in srgb, var(--bad) 8%, var(--surface)); }
.feedback .verdict { font-family: var(--font-mono); font-weight: 700; font-size: 0.9rem; letter-spacing: 0.1em; text-transform: uppercase; }
.feedback.ok .verdict { color: var(--good); }
.feedback.no .verdict { color: var(--bad); }
.feedback .answer-word { font-family: var(--font-display); font-size: 1.5rem; font-weight: 700; margin-top: 6px; }
.feedback .answer-pron { font-family: var(--font-mono); color: var(--text-dim); letter-spacing: 0.1em; font-size: 0.85rem; }
.spelling-note { font-family: var(--font-mono); margin-top: 8px; font-size: 0.8rem; color: var(--accent-strong); font-weight: 600; }

/* ---- results ---- */
.result-score { text-align: center; }
.result-score .big { font-family: var(--font-display); font-size: 3.4rem; font-weight: 700; color: var(--accent-strong); line-height: 1; letter-spacing: -0.02em; }
.result-score .muted.small { font-family: var(--font-mono); letter-spacing: 0.12em; text-transform: uppercase; font-size: 0.68rem; }
.result-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 14px; }
.stat-tile { background: var(--surface-2); border-radius: var(--radius-sm); padding: 14px; text-align: center; border: 1px solid var(--border); }
.stat-tile .n { font-family: var(--font-display); font-size: 1.6rem; font-weight: 700; }
.stat-tile .l { font-family: var(--font-mono); font-size: 0.62rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.08em; margin-top: 2px; }
.miss-list { list-style: none; padding: 0; margin: 8px 0 0; }
.miss-list li { display: flex; justify-content: space-between; align-items: center; padding: 10px 4px; border-bottom: 1px solid var(--border); }
.miss-list li:last-child { border-bottom: none; }
.miss-list li > span:first-child strong { font-family: var(--font-display); font-size: 1.1rem; color: var(--accent-strong); }
.miss-list .ml-word { font-family: var(--font-display); font-weight: 600; }
.miss-list .ml-word .muted { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.06em; }

/* ---- stats & badges ---- */
.badge-gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 12px; }
.badge {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
  text-align: center;
  background: var(--surface-2);
  transition: transform 0.12s ease, box-shadow 0.15s ease;
}
.badge:not(.locked):hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.badge.locked { opacity: 0.5; }
.badge .b-icon { font-size: 1.8rem; }
.badge .b-name { font-family: var(--font-display); font-weight: 700; margin-top: 6px; font-size: 0.92rem; }
.badge .b-desc { font-size: 0.72rem; color: var(--text-dim); margin-top: 3px; text-wrap: pretty; }
.badge .b-date { font-family: var(--font-mono); font-size: 0.64rem; color: var(--accent-strong); margin-top: 6px; letter-spacing: 0.04em; }

.mode-acc { display: grid; grid-template-columns: 1fr; gap: 12px; }
.mode-acc-row { display: flex; align-items: center; gap: 10px; }
.mode-acc-row .lbl { width: 110px; font-weight: 600; font-size: 0.88rem; }
.mode-acc-row .bar { flex: 1; height: 10px; background: var(--surface-2); border-radius: 999px; overflow: hidden; border: 1px solid var(--border); }
.mode-acc-row .bar span { display: block; height: 100%; background: linear-gradient(90deg, var(--accent-bright), var(--accent-strong)); border-radius: 999px; transition: width 0.5s ease; }
.mode-acc-row .val { width: 78px; text-align: right; font-family: var(--font-mono); font-size: 0.74rem; color: var(--text-dim); }

.heatmap { display: grid; grid-template-columns: repeat(12, 1fr); gap: 4px; }
.heat-week { display: grid; grid-template-rows: repeat(7, 1fr); gap: 4px; }
.heat-cell {
  aspect-ratio: 1/1;
  border-radius: 3px;
  background: var(--surface-2);
  border: 1px solid var(--border);
}
.heat-cell[data-lvl="1"] { background: rgba(23,179,172,0.35); border-color: transparent; }
.heat-cell[data-lvl="2"] { background: rgba(23,179,172,0.62); border-color: transparent; }
.heat-cell[data-lvl="3"] { background: var(--accent); border-color: var(--accent); }

/* ---- settings ---- */
.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}
.setting-row:last-child { border-bottom: none; }
.setting-row .label { font-weight: 600; }
.setting-row .desc { font-size: 0.78rem; color: var(--text-dim); }
.switch { position: relative; width: 52px; height: 48px; flex: none; }
.switch input { position: absolute; opacity: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }
.switch .slider {
  position: absolute; left: 0; right: 0; top: 50%; height: 30px; transform: translateY(-50%);
  border-radius: 999px; background: var(--surface-3);
  border: 1px solid var(--border-strong); transition: background 0.18s ease;
}
.switch .slider::before {
  content: ""; position: absolute; width: 24px; height: 24px; border-radius: 50%;
  background: #fff; top: 2px; left: 2px; transition: transform 0.18s ease; box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}
.switch input:checked + .slider { background: var(--accent); border-color: var(--accent); }
.switch input:checked + .slider::before { transform: translateX(22px); }
/* The real checkbox is opacity:0, so its own focus outline is invisible.
   Paint the keyboard focus ring on the visible slider instead. */
.switch input:focus-visible + .slider { outline: 3px solid var(--accent); outline-offset: 2px; }
.seg { display: inline-flex; border: 1px solid var(--border-strong); border-radius: var(--radius-sm); overflow: hidden; }
.seg button {
  min-height: 48px; padding: 6px 16px; border: none; background: var(--surface);
  color: var(--text); font-family: var(--font-mono); font-weight: 600; cursor: pointer;
  transition: background 0.15s ease;
}
.seg button:hover { background: var(--surface-2); }
.seg button.active { background: var(--accent-strong); color: #fff; }
.danger { color: var(--bad); border-color: var(--bad); }
.danger:hover { background: rgba(217,74,47,0.1); border-color: var(--bad); }

/* ---- how-to-play guide (minimal) ---- */
.guide-card { text-align: center; }
.guide-lead { margin: 6px 0 0; font-family: var(--font-display); font-size: 1.5rem; font-weight: 700; line-height: 1.32; }
.guide-lead strong { color: var(--accent-strong); }
.guide-modes { display: flex; flex-direction: column; gap: 8px; margin: 20px 0; text-align: left; }
.guide-modes .guide-row { display: flex; align-items: center; gap: 12px; padding: 12px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface-2); }
.guide-emoji { font-size: 1.4rem; flex: none; }
.guide-name { font-family: var(--font-display); font-weight: 700; font-size: 1.05rem; }
.guide-hint { margin-left: auto; font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-dim); }

/* ---- toasts ---- */
.toasts {
  position: fixed;
  left: 50%;
  bottom: calc(18px + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  z-index: 60;
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: min(92vw, 460px);
  pointer-events: none;
}
.toast {
  background: var(--text);
  color: var(--bg);
  padding: 13px 18px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  font-weight: 600;
  text-align: center;
  animation: toastIn 0.28s cubic-bezier(0.22, 1, 0.36, 1);
}
.toast.badge-toast { background: linear-gradient(180deg, var(--accent), var(--accent-strong)); color: #fff; }

/* ---- confetti ---- */
.confetti {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 55;
  width: 100%;
  height: 100%;
}

/* ---- animations ---- */
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
@keyframes toastIn { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
@keyframes pulse { 0% { transform: scale(1); } 40% { transform: scale(1.06); } 100% { transform: scale(1); } }
@keyframes shake { 0%,100% { transform: translateX(0); } 20% { transform: translateX(-8px); } 40% { transform: translateX(8px); } 60% { transform: translateX(-6px); } 80% { transform: translateX(6px); } }
@keyframes micPulse { 0%,100% { box-shadow: 0 0 0 10px var(--accent-soft); } 50% { box-shadow: 0 0 0 18px transparent; } }

.pulse { animation: pulse 0.4s ease; }
.shake { animation: shake 0.4s ease; }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
  .pulse, .shake, .screen, .toast, .mic-btn.listening { animation: none !important; }
}