:root {
  --bg: #0f172a;
  --card: #1e293b;
  --ink: #f8fafc;
  --muted: #94a3b8;
  --good: #22c55e;
  --bad: #ef4444;
  --accent: #38bdf8;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  min-height: 100%;
  -webkit-tap-highlight-color: transparent;
}
#app { max-width: 480px; margin: 0 auto; padding: 16px; padding-bottom: 48px; }
h1, .title-main { font-size: 1.35rem; margin: 0 0 12px; line-height: 1.25; }
h2, .prompt { font-size: 1.2rem; margin: 0 0 10px; line-height: 1.3; }
.muted { color: var(--muted); font-size: 0.95rem; }
.todo { margin: 0 0 12px; }
.toolbar { margin: 0 0 12px; }
.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.play-top { margin: 8px 0 4px; }

.btn, button.choice, button.bin, button.cat-tile, button.skill, button.skill-row, button.section-card, button.picwrap {
  display: block;
  width: 100%;
  text-align: left;
  background: var(--card);
  color: var(--ink);
  border: 2px solid #334155;
  border-radius: 16px;
  padding: 16px 18px;
  font-size: 1.15rem;
  margin: 8px 0;
  cursor: pointer;
  touch-action: manipulation;
}
.btn.primary { background: var(--accent); color: #0f172a; border-color: var(--accent); font-weight: 700; text-align: center; }
.btn.small { width: auto; padding: 10px 14px; font-size: 0.9rem; margin: 0; }
a.grades-link {
  display: inline-block;
  width: auto;
  text-decoration: none;
  margin-bottom: 8px;
}
.resume-btn { text-align: center; margin: 4px 0 12px; }
.sound-gesture-hint {
  margin: 0 0 12px;
  padding: 12px 14px;
  border-radius: 12px;
  border: 2px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 18%, var(--card));
  font-size: 0.95rem;
  line-height: 1.35;
}
.btn.replay {
  width: 56px;
  height: 56px;
  padding: 0;
  text-align: center;
  font-size: 1.4rem;
  border-radius: 50%;
  margin: 4px auto 12px;
}
.sound-toggle { font-weight: 600; }

.section-stack {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 12px 0 8px;
}
button.section-card {
  margin: 0;
  padding: 0;
  display: flex;
  align-items: stretch;
  min-height: 96px;
  overflow: hidden;
  border-color: var(--section-color, #334155);
  background: color-mix(in srgb, var(--section-color) 34%, #0f172a);
}
.section-card-bar {
  flex: 0 0 16px;
  background: var(--section-color, var(--accent));
}
.section-card-body {
  flex: 1;
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  text-align: left;
}
.section-card-name {
  font-size: 1.35rem;
  font-weight: 800;
  line-height: 1.2;
}
.section-card-meta {
  font-size: 0.95rem;
  color: var(--muted);
}
.section-card-progress {
  font-size: 0.9rem;
  color: var(--ink);
  opacity: 0.85;
  margin-top: 2px;
}

.skill-list { margin-top: 4px; }
.subsection { margin-bottom: 20px; }
.subsection-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 14px;
  margin: 0 0 6px;
  border-radius: 10px;
  background: var(--section-color, var(--accent));
  color: #0f172a;
  font-weight: 700;
}
.subsection-name {
  font-size: 0.95rem;
  line-height: 1.25;
  flex: 1;
  min-width: 0;
}
.subsection-count {
  font-size: 0.8rem;
  font-weight: 700;
  opacity: 0.85;
  white-space: nowrap;
}
.subsection-rows {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
button.skill-row {
  margin: 0;
  padding: 12px 12px 12px 10px;
  min-height: 64px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-color: #334155;
  background: #1a2332;
}
.skill-row-num {
  flex: 0 0 36px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 800;
  color: #0f172a;
  line-height: 1;
}
.skill-row-title {
  flex: 1;
  min-width: 0;
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.35;
  white-space: normal;
  word-wrap: break-word;
}
.score-pill {
  flex: 0 0 auto;
  min-width: 48px;
  padding: 8px 10px;
  border-radius: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  line-height: 1;
  text-align: center;
}
.score-pill.pill-none {
  background: #334155;
  color: var(--muted);
  font-size: 1.1rem;
  font-weight: 600;
}
.score-pill.pill-green {
  background: #22c55e;
  color: #052e16;
}
.score-pill.pill-blue {
  background: #38bdf8;
  color: #0c4a6e;
}
.score-pill.pill-orange {
  background: #fb923c;
  color: #431407;
}

.skill {
  margin: 10px 0;
  padding: 16px;
}
.skill strong { display: block; font-size: 1.05rem; line-height: 1.35; }
.skill-score-mini, .skill-meta { font-size: 0.82rem; margin-top: 4px; }

.scorebar {
  display: grid;
  grid-template-columns: 1fr 1.4fr 1fr;
  gap: 8px;
  align-items: end;
  margin: 0 0 12px;
  padding: 12px 8px;
  background: var(--card);
  border-radius: 16px;
  border: 2px solid #334155;
}
.score-col { text-align: center; }
.scorebar .num {
  display: block;
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.1;
}
.score-wrong .num { color: var(--bad); }
.score-good .num { color: var(--good); }
.score-mid .num { color: var(--accent); font-size: 2rem; }
.score-mid .lbl {
  display: block;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 4px;
  line-height: 1.2;
}

.choice.ok, .picwrap.ok { border-color: var(--good); background: #14532d; }
.choice.no, .picwrap.no { border-color: var(--bad); background: #7f1d1d; }

.skill-line { font-size: 0.88rem; margin-bottom: 8px; }

.pic {
  display: block;
  max-width: 100%;
  max-height: 200px;
  margin: 0 auto;
  border-radius: 12px;
  background: #0b1220;
  object-fit: contain;
}
.pics { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 8px 0; }
.pics .picwrap {
  margin: 0;
  padding: 10px;
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.pics .picwrap .pic { margin: 0; max-height: 140px; }
.pics .choice-text { font-size: 1.2rem; font-weight: 700; text-align: center; width: 100%; }

.stem { font-size: 1.35rem; line-height: 1.35; margin: 12px 0; }
.feedback { font-size: 1.2rem; font-weight: 700; min-height: 1.4em; margin-top: 8px; }
.search {
  width: 100%;
  padding: 14px 16px;
  border-radius: 14px;
  border: 2px solid #334155;
  background: var(--card);
  color: var(--ink);
  font-size: 1.05rem;
  margin: 8px 0 4px;
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0; }
.chip {
  background: var(--card);
  border: 2px solid #334155;
  border-radius: 999px;
  padding: 12px 16px;
  color: var(--ink);
  font-size: 1.05rem;
  width: auto;
  margin: 0;
}
.order-slot { min-height: 52px; border: 2px dashed #475569; border-radius: 12px; padding: 10px; margin: 6px 0; }

.lang-wrap {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 0;
}
.lang-lbl {
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  white-space: nowrap;
}
.lang-select {
  max-width: 9.5rem;
  padding: 8px 10px;
  border-radius: 12px;
  border: 2px solid #334155;
  background: var(--card);
  color: var(--ink);
  font-size: 0.85rem;
  touch-action: manipulation;
}
.play-top .lang-select { max-width: 7.5rem; font-size: 0.8rem; padding: 8px 6px; }

.explain-panel {
  margin-top: 12px;
  padding: 14px 16px;
  border-radius: 14px;
  border: 2px solid #475569;
  background: #1a2740;
  font-size: 1rem;
  line-height: 1.45;
  color: var(--ink);
}
.explain-panel[hidden] { display: none !important; }
.explain-h {
  font-weight: 800;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin: 0 0 6px;
}
.explain-block + .explain-block { margin-top: 14px; }
.explain-body {
  margin: 0;
  font-size: 1.12rem;
  line-height: 1.85;
}
.tap-word-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}
button.tap-word {
  display: inline-block;
  width: auto;
  margin: 0 3px 2px;
  padding: 6px 12px;
  background: #ffb020;
  color: #1a1000;
  font-size: 1.35rem;
  font-weight: 800;
  font-family: inherit;
  line-height: 1.2;
  text-decoration: underline;
  text-underline-offset: 3px;
  border: 3px solid #e67700;
  border-radius: 12px;
  cursor: pointer;
  vertical-align: baseline;
  appearance: none;
  -webkit-appearance: none;
  box-shadow: 0 3px 0 #c2410c;
  touch-action: manipulation;
}
button.tap-word.tapped {
  background: #22c55e;
  color: #052e16;
  border-color: #15803d;
  text-decoration: none;
  box-shadow: none;
}
.btn.primary:disabled,
.btn.primary.wait-taps,
#next:disabled {
  background: #64748b;
  border-color: #475569;
  color: #e2e8f0;
  cursor: not-allowed;
  opacity: 0.7;
  box-shadow: none;
}

.signin-screen { margin-top: 8px; }
.signin-intro { margin: 0 0 20px; line-height: 1.45; }
.signin-field { margin: 0 0 12px; }
.signin-label {
  display: block;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 6px;
}
.signin-input {
  width: 100%;
  padding: 16px 18px;
  border-radius: 16px;
  border: 2px solid #334155;
  background: var(--card);
  color: var(--ink);
  font-size: 1.15rem;
  touch-action: manipulation;
}
.signin-input:focus {
  outline: none;
  border-color: var(--accent);
}
.signin-err {
  color: var(--bad);
  font-size: 0.95rem;
  margin: 0 0 12px;
  min-height: 1.25em;
}
.signin-actions { margin-top: 8px; }
.btn.link {
  background: transparent;
  border: none;
  color: var(--muted);
  text-align: center;
  font-size: 0.95rem;
  text-decoration: underline;
  padding: 12px;
  margin-top: 4px;
}
.btn.link:active { opacity: 0.85; }
.home-user {
  font-size: 0.9rem;
  color: var(--muted);
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}