:root {
  --bg: #f6f5f2;
  --surface: #ffffff;
  --surface-2: #efeee9;
  --ink: #1d1d22;
  --ink-2: #55555e;
  --ink-3: #8a8a93;
  --line: #dddcd6;
  --accent: #6d5ce8;
  --accent-ink: #ffffff;
  --accent-soft: #e9e5fd;
  --bass: #3f2fb8;
  --played: #f0b44c;
  --good: #1f8a4c;
  --good-soft: #e1f3e8;
  --bad: #c43d3d;
  --bad-soft: #f9e3e3;
  --warn: #b26b00;
  --warn-soft: #fbf0d9;
  --rhythm: #2f74c0;
  --key-white: #ffffff;
  --key-black: #2a2a30;
  --radius: 12px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17171c;
    --surface: #212128;
    --surface-2: #2b2b33;
    --ink: #ececf1;
    --ink-2: #b4b4bf;
    --ink-3: #85858f;
    --line: #36363f;
    --accent: #8b7cf6;
    --accent-ink: #14141a;
    --accent-soft: #2f2a52;
    --bass: #b9afff;
    --played: #e0a640;
    --good: #4cc27f;
    --good-soft: #1d3527;
    --bad: #f06a6a;
    --bad-soft: #3d2222;
    --warn: #e9a53c;
    --warn-soft: #3a3020;
    --rhythm: #6aa8f0;
    --key-white: #e9e9ee;
    --key-black: #101014;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-tap-highlight-color: transparent;
}

.app {
  max-width: 760px;
  margin: 0 auto;
  padding: env(safe-area-inset-top) 16px calc(32px + env(safe-area-inset-bottom));
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0 8px;
}

h1 { font-size: 1.15rem; margin: 0; letter-spacing: .01em; }
h2 { margin: 0 0 6px; }
h3 { margin: 0 0 12px; font-size: 1rem; }
h3 small { color: var(--ink-3); font-weight: 400; margin-left: 6px; }

nav {
  position: sticky;
  top: 0;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
  padding: 4px;
  margin-bottom: 14px;
  background: var(--surface-2);
  border-radius: var(--radius);
}

nav button {
  border: 0;
  background: transparent;
  padding: 10px 0;
  font-weight: 600;
  color: var(--ink-2);
}

nav button.on { background: var(--surface); color: var(--ink); box-shadow: 0 1px 2px rgb(0 0 0 / .12); }

button, .button {
  font: inherit;
  cursor: pointer;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  border-radius: 10px;
  padding: 9px 14px;
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  touch-action: manipulation;
}

button:disabled { opacity: .55; cursor: default; }
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 600; }
button.big { font-size: 1.2rem; padding: 14px 44px; }
button.ghost { background: transparent; }
button.ghost.on { border-color: var(--accent); color: var(--accent); }
button.good.on, button.good:not(:disabled):hover { background: var(--good-soft); border-color: var(--good); }
button.bad.on, button.bad:not(:disabled):hover { background: var(--bad-soft); border-color: var(--bad); }
button.link { border: 0; background: none; min-height: 0; padding: 0 6px; color: var(--accent); font-size: .85rem; }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 14px;
}

.hint { color: var(--ink-3); font-size: .85rem; }

.banner {
  border-radius: 10px;
  padding: 10px 14px;
  margin-bottom: 12px;
  background: var(--surface-2);
}
.banner.good { background: var(--good-soft); color: var(--good); font-weight: 600; }
.banner.bad { background: var(--bad-soft); color: var(--bad); font-weight: 600; }
.banner.warn { background: var(--warn-soft); }
.banner b { color: var(--ink); }
.banner .meta { float: right; font-weight: 400; color: var(--ink-3); }

.badge {
  font-size: .78rem;
  color: var(--ink-3);
  border: 1px solid var(--line);
  border-radius: 99px;
  padding: 2px 10px;
}
.badge.live { color: var(--good); border-color: var(--good); }

.group { margin-bottom: 12px; }
.group-label { font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-3); margin-bottom: 6px; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.actions .primary { margin-left: auto; }
.actions.center { justify-content: center; align-items: center; }

.seg { display: flex; flex-wrap: wrap; gap: 4px; padding: 3px; background: var(--surface-2); border-radius: 10px; }
.seg button { flex: 1 1 auto; border: 0; background: transparent; min-height: 38px; color: var(--ink-2); }
.seg button.on { background: var(--surface); color: var(--ink); font-weight: 600; box-shadow: 0 1px 2px rgb(0 0 0 / .12); }

.field { margin-bottom: 12px; }
.field > span { display: block; font-size: .85rem; color: var(--ink-2); margin-bottom: 4px; }

.chips, .presets { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.presets { margin: 0 0 14px; }
button.chip { min-height: 36px; padding: 5px 12px; border-radius: 99px; color: var(--ink-2); }
button.chip.on { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }

.toggle { display: flex; gap: 10px; align-items: flex-start; padding: 8px 0; cursor: pointer; }
.toggle input { width: 20px; height: 20px; margin-top: 2px; accent-color: var(--accent); flex: none; }
.toggle small { display: block; color: var(--ink-3); font-size: .8rem; }

.slider { display: block; padding: 6px 0; }
.slider span { display: flex; justify-content: space-between; font-size: .92rem; }
.slider b { font-variant-numeric: tabular-nums; }
.slider input { width: 100%; accent-color: var(--accent); }



select {
  font: inherit;
  color: var(--ink);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 10px;
  min-height: 40px;
}

.key-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.key-row .seg { flex: 0 1 auto; }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 600px) { .row2 { grid-template-columns: 1fr; } }
.seg small.range { display: block; font-size: .72rem; font-weight: 400; color: var(--ink-3); }
.seg button:has(small) { flex-direction: column; gap: 0; line-height: 1.2; }

details.options summary { cursor: pointer; font-weight: 600; display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap; }
details.options summary .hint { font-weight: 400; }
details.options[open] summary { margin-bottom: 12px; }

.header-end { display: flex; align-items: center; gap: 10px; }
.lang .seg button { min-height: 30px; padding: 2px 10px; font-size: .82rem; }

/* ---------------------------------------------------------------- trainer */

.status { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; min-height: 44px; }
.status .banner { flex: 1; margin: 0; }
.prompt { font-size: 1.1rem; font-weight: 600; padding: 8px 0; }
.tally { color: var(--ink-3); font-variant-numeric: tabular-nums; padding: 10px 0; white-space: nowrap; }
.single { display: flex; justify-content: center; margin-top: 8px; }
.keys { margin-top: 10px; }
.ok-text { color: var(--good); font-weight: 600; }
.err-text { color: var(--bad); font-weight: 600; }

.dict-head { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; margin-bottom: 8px; }
.dict-bar { display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: baseline; margin-bottom: 8px; }
.progress { font-weight: 600; }
.progress small { color: var(--ink-3); font-weight: 400; }
.plays { color: var(--ink-3); font-size: .88rem; }
.tools { display: flex; flex-wrap: wrap; gap: 4px; margin-bottom: 6px; }
.tools button { min-width: 40px; min-height: 38px; padding: 4px 8px; font-size: 1.05rem; }

/* ---------------------------------------------------------------- score */

.score-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.systems { display: flex; flex-direction: column; gap: 4px; }
svg.score { display: block; max-width: 100%; height: auto; user-select: none; -webkit-user-select: none; touch-action: manipulation; }
svg.score.interactive { cursor: crosshair; }
.score .staff line { stroke: var(--ink-3); stroke-width: 1; }
.score line.bar { stroke: var(--ink-3); stroke-width: 1; }
.score line.bar.final { stroke-width: 3; }
.score line.ledger { stroke: var(--ink-3); stroke-width: 1.2; }
.score .clef { fill: var(--ink-2); font-family: "Noto Music", "Bravura Text", "Apple Symbols", "Segoe UI Symbol", "Symbola", serif; }
.score .acc { fill: var(--ink); font-size: 17px; font-family: "Apple Symbols", "Segoe UI Symbol", "Noto Music", system-ui, serif; }
.score .tsig text { font: 700 22px/1 Georgia, "Times New Roman", serif; fill: var(--ink); }
.score .note .head { fill: var(--ink); }
.score .stem { stroke: var(--ink); stroke-width: 1.3; }
.score .note.given .head, .score .note.given .acc { fill: var(--ink-3); }
.score .note.given .stem { stroke: var(--ink-3); }
.score .note.ok .head, .score .note.ok .acc { fill: var(--good); }
.score .note.ok .stem { stroke: var(--good); }
.score .note.enh .head, .score .note.enh .acc { fill: var(--warn); }
.score .note.enh .stem { stroke: var(--warn); }
.score .note.wrong .head, .score .note.wrong .acc { fill: var(--bad); }
.score .note.wrong .stem { stroke: var(--bad); }
.score .note.sel .head, .score .note.sel .acc { fill: var(--accent); }
.score .note.sel .stem { stroke: var(--accent); }
.score .note.correct { opacity: .55; }
.score .note.correct .head, .score .note.correct .acc { fill: var(--good); }
.score .note.correct .stem { stroke: var(--good); }
.score .note.ghost { opacity: .35; pointer-events: none; }
.score .note.ghost .head { fill: var(--accent); }
.score .note.ghost .stem { stroke: var(--accent); }
.score rect.active { fill: var(--surface-2); }
.score rect.cursor { fill: var(--accent-soft); }
.score rect.playing { fill: var(--warn-soft); }

/* ---------------------------------------------------------------- piano */

.piano-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; margin-bottom: 8px; }
svg.piano { display: block; width: 100%; height: auto; margin: 0 auto; touch-action: manipulation; user-select: none; -webkit-user-select: none; }
.piano .k { cursor: pointer; }
.piano rect.white { fill: var(--key-white); stroke: var(--line); stroke-width: 1; }
.piano rect.black { fill: var(--key-black); }
.piano .k.down rect { fill: var(--accent-soft); }
.piano .k.down rect.black { fill: var(--accent); }
.piano .k.target rect { fill: var(--good); }
.piano .k.wrong rect { fill: var(--bad); }
.piano text { font-size: 8px; font-weight: 600; fill: var(--ink-3); pointer-events: none; }
.piano .k.target text, .piano .k.wrong text { fill: #fff; }

/* ---------------------------------------------------------------- stats */

.big-stats { display: flex; gap: 28px; margin-bottom: 14px; }
.big-stats b { display: block; font-size: 1.8rem; line-height: 1.1; font-variant-numeric: tabular-nums; }
.big-stats small { color: var(--ink-3); }
.stat-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 600px) { .stat-cols { grid-template-columns: 1fr; } }
.meter-row { display: grid; grid-template-columns: 64px 1fr 72px; gap: 8px; align-items: center; font-size: .88rem; padding: 2px 0; }
.meter-row b { text-align: right; font-variant-numeric: tabular-nums; font-weight: 500; color: var(--ink-2); }
.meter-row b small { color: var(--ink-3); font-weight: 400; }
.meter { height: 6px; background: var(--surface-2); border-radius: 3px; overflow: hidden; }
.meter span { display: block; height: 100%; background: var(--accent); border-radius: 3px; }
ul.confusions, ul.history { list-style: none; padding: 0; margin: 0 0 10px; }
ul.confusions li { padding: 3px 0; font-size: .92rem; }
ul.confusions small { color: var(--ink-3); }
ul.history li { display: grid; grid-template-columns: auto 1fr auto; gap: 10px; padding: 6px 0; border-top: 1px solid var(--line); font-size: .9rem; align-items: baseline; }
ul.history .date { color: var(--ink-3); font-variant-numeric: tabular-nums; }
ul.history b { font-variant-numeric: tabular-nums; }
.confirm { display: inline-flex; gap: 8px; align-items: center; color: var(--ink-2); }
kbd {
  font: .78rem ui-monospace, monospace;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0 4px;
  background: var(--surface-2);
}

.actions.center .primary { margin-left: 0; }
@media (max-width: 420px) { nav button { font-size: .86rem; padding: 9px 0; } nav { gap: 2px; } }

/* ---------------------------------------------------------------- rhythm input */

.input-bar { display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: flex-start; margin-bottom: 6px; }
.durations { display: flex; flex-wrap: wrap; gap: 4px; }
button.dur { flex-direction: column; gap: 0; min-width: 36px; min-height: 0; padding: 2px 1px 3px; line-height: 1; }
button.dur.on { border-color: var(--accent); background: var(--accent-soft); }
button.dur small { font-size: .68rem; color: var(--ink-3); font-variant-numeric: tabular-nums; }
button.dur .glyph { display: flex; align-items: center; justify-content: center; height: 40px; font-weight: 700; font-size: 1.1rem; }
svg.dur-icon { display: block; }
svg.dur-icon .head { fill: var(--ink); }
svg.dur-icon .stem, svg.dur-icon .flag { stroke: var(--ink); stroke-width: 1.4; fill: none; }
.tools { margin-bottom: 0; }
.tools button { min-height: 40px; }
.level-hint { display: block; color: var(--ink-3); margin-top: 4px; }
.banner .sub { font-weight: 400; font-size: .9rem; margin-top: 2px; }

.score .beam { fill: var(--ink); }
.score .flag { stroke: var(--ink); stroke-width: 1.6; fill: none; }
.score .dot { fill: var(--ink); }
.score .tuplet { font: italic 700 12px Georgia, serif; fill: var(--ink-2); }
.score .note.rhythm .head, .score .note.rhythm .acc, .score .note.rhythm .dot { fill: var(--rhythm); }
.score .note.rhythm .stem, .score .note.rhythm .flag { stroke: var(--rhythm); }
.score .note.pitch .head, .score .note.pitch .acc, .score .note.pitch .dot { fill: var(--bad); }
.score .note.pitch .stem, .score .note.pitch .flag { stroke: var(--bad); }
.score .note.playing .head { fill: var(--accent); }
.score .correct { opacity: .5; }
.score .correct .head, .score .correct .acc, .score .correct .dot, .score .correct .beam { fill: var(--good); }
.score .correct .stem, .score .correct .flag { stroke: var(--good); }
.score .note.sel .dot { fill: var(--accent); }
.score .note.sel .flag { stroke: var(--accent); }
.score .note.ok .flag { stroke: var(--good); } .score .note.ok .dot { fill: var(--good); }
.score .note.enh .flag { stroke: var(--warn); } .score .note.enh .dot { fill: var(--warn); }
.score .note.wrong .flag { stroke: var(--bad); } .score .note.wrong .dot { fill: var(--bad); }
.score .note.given .flag { stroke: var(--ink-3); } .score .note.given .dot { fill: var(--ink-3); }
.score .beam-group.given .beam { fill: var(--ink-3); }