:root {
  --bg: #f6f4ef;
  --card: #ffffff;
  --text: #1f2328;
  --muted: #6b7078;
  --border: #e3e0d8;
  --primary: #3d5afe;
  --primary-ink: #ffffff;
  --accent: #0f9d76;
  --good: #0f9d76;
  --warn: #d98a00;
  --bad: #d64545;
  --chip: #eef0f6;
  --grid: #e9e6de;
  --trace: #3d5afe;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171c;
    --card: #1e2128;
    --text: #e8e9ec;
    --muted: #9aa0aa;
    --border: #2e323b;
    --primary: #7088ff;
    --primary-ink: #0d0f14;
    --accent: #2ec795;
    --good: #2ec795;
    --warn: #f0b13c;
    --bad: #ff6b6b;
    --chip: #2a2e37;
    --grid: #2b2f38;
    --trace: #8fa2ff;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.topbar {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  padding: 14px 24px; border-bottom: 1px solid var(--border); background: var(--card);
}
.brand { font-weight: 700; font-size: 1.2rem; }
.brand .sub { font-weight: 400; color: var(--muted); font-size: .9rem; margin-left: 8px; }
.tabs { display: flex; gap: 4px; }
.tab {
  border: 0; background: transparent; color: var(--muted); font: inherit;
  padding: 6px 14px; border-radius: 8px; cursor: pointer;
}
.tab.active { background: var(--chip); color: var(--text); font-weight: 600; }

.banner { background: var(--bad); color: #fff; padding: 10px 24px; }
main { max-width: 1180px; margin: 0 auto; padding: 24px 16px; }
.panel { display: none; }
.panel.active { display: grid; gap: 20px; }
#tab-practice.active { grid-template-columns: minmax(0, 1fr) 340px; align-items: start; }
@media (max-width: 900px) { #tab-practice.active { grid-template-columns: 1fr; } }

.card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 20px 22px; }
h2 { margin: 0 0 10px; font-size: 1.3rem; }
h3 { margin: 18px 0 8px; font-size: 1rem; }
h3:first-child { margin-top: 0; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.error { color: var(--bad); }

.btn {
  font: inherit; border: 1px solid var(--border); background: var(--card); color: var(--text);
  padding: 8px 14px; border-radius: 9px; cursor: pointer;
}
.btn:hover:not(:disabled) { border-color: var(--primary); }
.btn:disabled { opacity: .45; cursor: default; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: var(--primary-ink); font-weight: 600; }
.btn.accent { background: var(--accent); border-color: var(--accent); color: var(--primary-ink); font-weight: 600; }
.btn.danger { color: var(--bad); }
.btn.big { font-size: 1.1rem; padding: 12px 22px; }
.btn.listening { animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .65; } }

.drill-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.segmented { display: inline-flex; background: var(--chip); border-radius: 10px; padding: 3px; gap: 2px; flex-wrap: wrap; }
.seg {
  border: 0; background: transparent; color: var(--muted); font: inherit; font-weight: 600;
  padding: 6px 12px; border-radius: 8px; cursor: pointer;
}
.seg.active { background: var(--card); color: var(--text); box-shadow: 0 1px 2px rgb(0 0 0 / .12); }
.chord-tones:empty { display: none; }
.settings h3 { margin: 6px 0 -4px; font-size: .95rem; color: var(--muted); }
.key-label { color: var(--muted); font-size: .95rem; min-height: 1.4em; }
.range-pick { color: var(--muted); font-size: .9rem; }
.range-pick select { margin-left: 6px; }
.settings select, .player select, .range-pick select { font: inherit; padding: 6px 8px; border-radius: 8px; border: 1px solid var(--border); background: var(--card); color: var(--text); }
.start-box { text-align: center; padding: 20px 0; }
.start-box p { max-width: 560px; margin: 0 auto 12px; }

.prompt { text-align: center; margin: 10px 0 4px; }
.prompt-label { display: block; color: var(--muted); text-transform: uppercase; letter-spacing: .12em; font-size: .8rem; }
.syl { font-size: 4.2rem; font-weight: 800; line-height: 1.1; color: var(--primary); }
.chord-tones { display: flex; justify-content: center; gap: 8px; margin-bottom: 14px; }
.chip { background: var(--chip); padding: 3px 12px; border-radius: 999px; font-size: .9rem; color: var(--muted); }
.chip.target { background: var(--primary); color: var(--primary-ink); font-weight: 600; }

.live-row { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 4px; }
.status { font-weight: 600; }
.hearing { color: var(--muted); font-variant-numeric: tabular-nums; }
.level { height: 5px; background: var(--chip); border-radius: 3px; overflow: hidden; margin-bottom: 8px; }
#levelBar { height: 100%; width: 0; background: var(--accent); transition: width 60ms linear; }
#trace { width: 100%; display: block; border: 1px solid var(--border); border-radius: 10px; }

.feedback { margin-top: 14px; padding: 12px 16px; border-radius: 10px; border-left: 5px solid var(--muted); background: var(--chip); }
.feedback.correct { border-left-color: var(--good); }
.feedback.close { border-left-color: var(--warn); }
.feedback.wrong { border-left-color: var(--bad); }
.fb-headline { font-weight: 600; font-size: 1.08rem; }
.feedback ul { margin: 6px 0 0; padding-left: 20px; }

.controls { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.hint { color: var(--muted); font-size: .82rem; margin: 10px 0 0; }
kbd { background: var(--chip); border: 1px solid var(--border); border-radius: 4px; padding: 0 5px; font-size: .78rem; }

.stat-grid { display: grid; grid-template-columns: repeat(3, 1fr); text-align: center; gap: 6px; }
.stat-grid .num { display: block; font-size: 1.6rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.stat-grid .lbl { color: var(--muted); font-size: .8rem; }
.syl-table { width: 100%; border-collapse: collapse; font-size: .9rem; font-variant-numeric: tabular-nums; }
.syl-table th, .syl-table td { text-align: left; padding: 4px 6px; border-bottom: 1px solid var(--border); }
.syl-table th { color: var(--muted); font-weight: 500; }
.history { margin: 0; padding-left: 22px; font-size: .88rem; max-height: 260px; overflow: auto; }
.history li { margin-bottom: 3px; }
.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 6px; }
.dot.correct { background: var(--good); } .dot.close { background: var(--warn); } .dot.wrong { background: var(--bad); }

.prose { max-width: 820px; }
.prose h2 { margin-top: 26px; } .prose h2:first-child { margin-top: 0; }
.player { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 10px 0; }
.player select { margin-left: 6px; }
.syl-row { display: flex; flex-wrap: wrap; gap: 6px; margin: 6px 0; }
.syl-btn { min-width: 52px; }
.syl-btn.lit { background: var(--primary); color: var(--primary-ink); border-color: var(--primary); }
.chrom { border-collapse: collapse; margin: 8px 0; }
.chrom th, .chrom td { border: 1px solid var(--border); padding: 4px 12px; text-align: center; }
.chrom th { text-align: left; color: var(--muted); font-weight: 500; }

.settings { max-width: 560px; display: grid; gap: 14px; }
.settings label { display: grid; gap: 4px; }
.settings label.inline { display: flex; gap: 8px; align-items: center; }
fieldset { border: 1px solid var(--border); border-radius: 10px; padding: 8px 14px 12px; }
.checks { display: flex; gap: 18px; flex-wrap: wrap; }
.checks label { display: flex; gap: 6px; align-items: center; }
.row { display: flex; gap: 8px; flex-wrap: wrap; }