/*
 * A dark, low-glare interface. You are looking at this with a guitar in your
 * hands, often in a dim room, and usually only for a few seconds at a time —
 * so type is large, contrast is high, and nothing moves that does not need to.
 */

:root {
  --bg: #090b12;
  --bg-raised: #101522;
  --bg-sunken: #070911;
  --line: #283149;
  --text: #f6f0e7;
  --text-dim: #9da8bc;
  --accent: #a78bfa;
  --accent-dim: #6d5bd0;
  --warm: #f0bd64;
  --danger: #f07878;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgb(0 0 0 / .3), 0 8px 24px -12px rgb(0 0 0 / .5);
  --tap: 46px;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f4efe7;
    --bg-raised: #fffaf2;
    --bg-sunken: #ebe4da;
    --line: #d2c6b8;
    --text: #201c25;
    --text-dim: #6c6473;
    --accent: #6650c9;
    --accent-dim: #6650c9;
    --warm: #9a5d16;
    --danger: #b33e49;
  }
  .note.is-playing { color: #fff; }
  .fb-dotnum { fill: #fff; }
  .phrase-block.is-motif { background: hsl(var(--hue) 42% 82%); color: hsl(var(--hue) 45% 22%); }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    radial-gradient(circle at 18% -10%, color-mix(in srgb, var(--accent) 13%, transparent), transparent 34rem),
    var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 .4em; }
h1 { font-size: 1.15rem; letter-spacing: .01em; }
h2 { font-size: 1.35rem; }
h3 { font-size: 1.1rem; margin-top: 1.4em; }
h4 { font-size: .95rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: .06em; }
p { margin: 0 0 .7em; }
code { font-family: var(--mono); }

/* ---- chrome ---- */

.app-header {
  display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;
  padding: .75rem 1.25rem;
  background: color-mix(in srgb, var(--bg-raised) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 10;
}
.app-header h1 { font-size: .95rem; font-weight: 600; margin: 0; }
.brand { display: flex; align-items: baseline; gap: .6rem; }
.tagline { color: var(--text-dim); font-size: .85rem; margin: 0; }

.live-dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--line); align-self: center; flex: none;
}
.live-dot.is-live { background: var(--accent); box-shadow: 0 0 0 4px rgb(94 224 176 / .18); }

.nav { display: flex; gap: .2rem; margin-left: auto; align-items: center; }
.nav-tab {
  background: none; border: 1px solid transparent; color: var(--text-dim);
  padding: .5rem .85rem; border-radius: var(--radius-sm); cursor: pointer;
  font: inherit; font-size: .92rem; font-weight: 500;
  min-height: var(--tap);
}
.nav-tab:hover { color: var(--text); }
.nav-tab.is-active { color: var(--bg); background: var(--accent); font-weight: 600; }

.nav-more { display: none; gap: .25rem; }
.nav-more.is-open { display: flex; }
.nav-more-toggle::after { content: ' \25be'; }

.sound-blocked {
  display: flex; align-items: center; gap: .75rem; flex-wrap: wrap;
  padding: .7rem 1.5rem; font-size: .9rem;
  background: var(--accent-dim); color: #fff;
}
.sound-blocked[hidden] { display: none; }

.tuning-field { display: flex; align-items: center; gap: .5rem; font-size: .85rem; color: var(--text-dim); }
.select {
  background: var(--bg-sunken); color: var(--text); border: 1px solid var(--line);
  border-radius: 8px; padding: .35rem .5rem; font: inherit; font-size: .85rem;
}

.status { max-height: 0; overflow: hidden; transition: max-height .2s ease; }
.status.is-visible { max-height: 6rem; }
.status-message {
  margin: 0; padding: .7rem 1.5rem; font-size: .9rem;
  background: var(--accent-dim); color: #fff;
}
.status-message.is-error { background: #6d2b2b; }

.main { max-width: 900px; margin: 0 auto; padding: 1.5rem 1.25rem 4rem; }

.app-footer {
  max-width: 900px; margin: 0 auto; padding: 0 1.25rem 3rem;
  color: var(--text-dim); font-size: .8rem;
}

/* ---- panels ---- */

.panel {
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}
.muted { color: var(--text-dim); font-size: .9rem; }
.lede { font-size: 1.05rem; }
.empty { color: var(--text-dim); font-style: italic; padding: .5rem 0; }
.hint { max-width: 48ch; }

/* ---- buttons ---- */

.btn {
  font: inherit; cursor: pointer;
  background: var(--bg-sunken); color: var(--text);
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: .5rem .9rem;
}
.btn:hover:not(:disabled) { border-color: var(--accent-dim); }
.btn:disabled { opacity: .4; cursor: not-allowed; }
.btn-primary { background: var(--accent-dim); border-color: transparent; color: #fff; font-weight: 600; }
.btn-primary:hover:not(:disabled) { filter: brightness(1.12); }
.btn-quiet { font-size: .85rem; padding: .35rem .7rem; }
.btn-danger:hover { border-color: var(--danger); color: var(--danger); }
.btn-play { padding: .3rem .7rem; font-size: .85rem; flex: none; }
.btn.is-live { background: var(--danger); }
.link {
  background: none; border: none; padding: 0; font: inherit;
  color: var(--accent); cursor: pointer; text-decoration: underline;
}

/* ---- listening bar ---- */

.listen-bar {
  display: flex; align-items: center; gap: 1.25rem; flex-wrap: wrap;
  background: var(--bg-raised); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1rem 1.25rem; margin-bottom: 1.25rem;
}
.btn-listen { font-size: 1rem; padding: .7rem 1.2rem; }
.btn-ask { font-size: 1.05rem; padding: .8rem 1.4rem; }
.ask-row { margin-bottom: .6rem; }

.readout { display: flex; align-items: center; gap: 1rem; }
.readout-note {
  font-family: var(--mono); font-size: 2.2rem; font-weight: 600;
  min-width: 3.2ch; text-align: center; font-variant-numeric: tabular-nums;
}
.cents { width: 150px; }
.cents-track {
  height: 6px; background: var(--bg-sunken); border-radius: 3px;
  position: relative; overflow: hidden;
}
.cents-track::after {
  content: ''; position: absolute; left: 50%; top: 0; bottom: 0; width: 1px;
  background: var(--line);
}
.cents-fill {
  position: absolute; left: calc(50% - 4px); top: 0; bottom: 0; width: 8px;
  background: var(--warm); border-radius: 3px; transition: transform .08s linear;
}
.cents-label { font-size: .75rem; color: var(--text-dim); margin-top: .25rem; }
.cents-label.is-good { color: var(--accent); }

.level { flex: 1; min-width: 80px; height: 8px; background: var(--bg-sunken); border-radius: 4px; overflow: hidden; }
.level-fill { height: 100%; width: 0; background: var(--accent-dim); transition: width .08s linear; }

/* ---- notes ---- */

.note-stream { display: flex; flex-wrap: wrap; gap: .3rem; min-height: 2rem; }
.chip {
  font-family: var(--mono); font-size: .8rem; padding: .2rem .45rem;
  background: var(--bg-sunken); border-radius: 5px; color: var(--text-dim);
}

.playable { display: flex; align-items: center; gap: .7rem; flex-wrap: wrap; margin: .5rem 0 .9rem; }
.note-row { display: flex; align-items: center; gap: .3rem; flex-wrap: wrap; font-family: var(--mono); }
.note {
  padding: .25rem .45rem; border-radius: 6px; background: var(--bg-sunken);
  font-size: 1rem; transition: background .1s, color .1s;
}
.note.is-playing { background: var(--accent); color: #0d0f14; font-weight: 700; }
.note-arrow { color: var(--text-dim); font-size: .85rem; }

/* ---- timeline ---- */

.timeline {
  position: relative; height: 58px; background: var(--bg-sunken);
  border-radius: 8px; overflow: hidden; margin-top: .5rem;
}
.timeline .empty { padding: 1rem; }
.phrase-block {
  position: absolute; top: 8px; bottom: 8px;
  background: var(--line); border: 1px solid transparent; border-radius: 6px;
  cursor: pointer; color: var(--text-dim); font: inherit; font-size: .7rem;
  /* Without nowrap a two-word label wraps and spills out of a narrow block. */
  white-space: nowrap; overflow: hidden; padding: 0 2px;
  display: flex; align-items: center; justify-content: center; min-width: 12px;
}
.phrase-block:hover { border-color: var(--accent); color: var(--text); z-index: 2; }
.phrase-block.is-motif {
  background: hsl(var(--hue) 45% 30%);
  color: hsl(var(--hue) 60% 88%);
}
.timeline-note { margin: .5rem 0 0; font-size: .8rem; }
.timeline-scale {
  display: flex; justify-content: space-between;
  font-size: .7rem; color: var(--text-dim); margin-top: .25rem;
}

/* ---- recall ---- */

.recall .takes { display: grid; gap: .9rem; margin: 1rem 0; }
.take {
  background: var(--bg-sunken); border: 1px solid var(--line);
  border-radius: var(--radius); padding: .9rem 1rem;
}
.take.is-cleanest { border-color: var(--accent-dim); }
.take-head { display: flex; align-items: baseline; gap: .6rem; flex-wrap: wrap; }
.take-head h4 { margin: 0; text-transform: none; letter-spacing: 0; font-size: 1rem; color: var(--text); }
.take-when { color: var(--text-dim); font-size: .8rem; margin-left: auto; }
.take-diff { color: var(--warm); font-size: .9rem; }
.take-actions { display: flex; gap: .5rem; flex-wrap: wrap; margin-top: .5rem; }
.badge {
  font-size: .68rem; text-transform: uppercase; letter-spacing: .06em;
  background: var(--accent-dim); color: #fff; padding: .12rem .4rem; border-radius: 4px;
}
.recognised {
  background: var(--bg-sunken); border-left: 3px solid var(--warm);
  padding: .7rem .9rem; border-radius: 0 8px 8px 0;
}

.section { margin-top: 1rem; border-top: 1px solid var(--line); padding-top: .8rem; }
.section > summary {
  cursor: pointer; font-weight: 600; color: var(--text);
  list-style: none; padding: .2rem 0;
}
.section > summary::before { content: '▸ '; color: var(--text-dim); }
.section[open] > summary::before { content: '▾ '; }
.section > summary::-webkit-details-marker { display: none; }

.suggestions { display: grid; gap: .8rem; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.suggestion { background: var(--bg-sunken); border-radius: 8px; padding: .8rem; }
.suggestion h4 { color: var(--accent); }
.chords { padding-left: 1.1rem; font-size: .92rem; }
.chords li { margin-bottom: .35rem; }

/* ---- tab and fretboard ---- */

.tab {
  font-family: var(--mono); font-size: .85rem; line-height: 1.45;
  background: var(--bg-sunken); padding: .8rem 1rem; border-radius: 8px;
  overflow-x: auto; margin: .6rem 0;
}
.fretboard { display: block; max-width: 100%; height: auto; margin: .6rem 0; }
.fb-string { stroke: var(--text-dim); opacity: .55; }
.fb-fret { stroke: var(--line); stroke-width: 2; }
.fb-nut { stroke: var(--text-dim); stroke-width: 5; }
.fb-label, .fb-fretnum { fill: var(--text-dim); font-size: 11px; font-family: var(--mono); }
.fb-dot { fill: var(--accent); }
.fb-open { fill: none; stroke: var(--accent); stroke-width: 2; }
.fb-dotnum { fill: #0d0f14; font-weight: 700; font-family: var(--mono); }
.fb-opennum { fill: var(--accent); }

/* ---- explanation ---- */

.explanation { margin: .6rem 0; }
.explanation-headline { font-size: 1.05rem; font-family: var(--mono); color: var(--accent); }
.explanation-line { max-width: 62ch; }
.theory {
  margin-top: .7rem; background: var(--bg-sunken); border-radius: 8px; padding: .6rem .9rem;
  font-size: .9rem; color: var(--text-dim);
}
.theory summary { cursor: pointer; color: var(--text-dim); }

.facts { display: grid; grid-template-columns: auto 1fr; gap: .2rem 1rem; margin: .6rem 0 1rem; font-size: .92rem; }
.facts dt { color: var(--text-dim); }
.facts dd { margin: 0; font-family: var(--mono); }

/* ---- library ---- */

.riff-list { display: grid; gap: .6rem; }
.riff-card {
  display: grid; gap: .15rem; text-align: left; cursor: pointer;
  background: var(--bg-sunken); border: 1px solid transparent;
  border-radius: var(--radius); padding: .8rem 1rem; font: inherit; color: var(--text);
}
.riff-card:hover { border-color: var(--accent-dim); }
.riff-card.is-selected { border-color: var(--accent); }
.riff-index { font-size: .7rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: .08em; }
.riff-name { font-size: 1.05rem; font-weight: 600; }
.riff-notes { font-family: var(--mono); font-size: .85rem; color: var(--text-dim); }
.riff-meta { font-size: .78rem; color: var(--text-dim); }
.riff-head { display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; }
.riff-title { margin: 0; margin-right: auto; }
.original-audio audio { width: 100%; margin: .4rem 0 1rem; }

.version-branch { margin-left: 0; }
.version {
  background: var(--bg-sunken); border-left: 3px solid var(--line);
  border-radius: 0 8px 8px 0; padding: .7rem .9rem; margin: .5rem 0;
  margin-left: calc(var(--depth) * 1.5rem);
}
.version.is-current { border-left-color: var(--accent); }
.version-head { display: flex; align-items: baseline; gap: .6rem; }
.version-actions { display: flex; gap: .5rem; flex-wrap: wrap; }
.related { padding-left: 1.1rem; }

/* ---- practice ---- */

.practice-controls { display: flex; gap: 1.5rem; flex-wrap: wrap; align-items: center; margin: .6rem 0; }
.field { display: flex; align-items: center; gap: .5rem; font-size: .85rem; color: var(--text-dim); }
.speed-row { display: flex; gap: .3rem; }
.chip-btn {
  font: inherit; font-size: .8rem; cursor: pointer; padding: .3rem .6rem;
  background: var(--bg-sunken); color: var(--text-dim);
  border: 1px solid var(--line); border-radius: 6px;
}
.chip-btn.is-on { background: var(--accent-dim); color: #fff; border-color: transparent; }
.practice-actions { display: flex; gap: .5rem; flex-wrap: wrap; margin: .7rem 0; }
.practice-status { color: var(--text-dim); font-size: .92rem; }
.coaching {
  background: var(--bg-sunken); border-left: 3px solid var(--warm);
  padding: .8rem 1rem; border-radius: 0 8px 8px 0; font-size: 1.02rem;
}
.coaching.is-nailed { border-left-color: var(--accent); }
.coaching p { margin: 0 0 .3em; }

/* ---- fingerprint ---- */

.fingerprint-lines { padding-left: 1.1rem; font-size: 1.02rem; }
.fingerprint-lines li { margin-bottom: .6rem; max-width: 62ch; }
.departure {
  margin-top: 1.2rem; background: var(--bg-sunken);
  border-left: 3px solid var(--warm); padding: .9rem 1.1rem; border-radius: 0 8px 8px 0;
}
.bars { display: grid; gap: .3rem; margin: .5rem 0 1rem; }
.bar-row { display: grid; grid-template-columns: 2.5rem 1fr 2rem; align-items: center; gap: .6rem; }
.bar-label { font-family: var(--mono); }
.bar { height: 10px; background: var(--bg-sunken); border-radius: 5px; overflow: hidden; }
.bar-fill { display: block; height: 100%; background: var(--accent-dim); }
.bar-value { font-size: .8rem; color: var(--text-dim); text-align: right; }
.shape-list { padding-left: 1.1rem; }
.shape-list code { background: var(--bg-sunken); padding: .1rem .4rem; border-radius: 4px; }

@media (max-width: 1040px) {
  .tagline { display: none; }
}

@media (max-width: 620px) {
  .app-header { gap: .7rem; padding: .7rem 1rem; }
  .nav { width: 100%; margin-left: 0; flex-wrap: wrap; }
  .sound-blocked { padding: .7rem 1rem; }
  .readout-note { font-size: 1.8rem; }
  .main { padding: 1rem .75rem 3rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}

/* ---- recognising an old idea ---- */

.echo-host:not(:empty) { margin: .8rem 0; display: grid; gap: .5rem; }
.echo {
  background: var(--bg-sunken); border-left: 3px solid var(--warm);
  border-radius: 0 8px 8px 0; padding: .7rem .9rem;
}
.echo p { margin: 0 0 .4rem; }
.echo-actions { display: flex; gap: .5rem; }

/* ---- song seed ---- */

.song-sections { list-style: none; padding: 0; margin: .8rem 0; display: grid; gap: .4rem; }
.song-section {
  display: grid; align-items: center; gap: .7rem;
  grid-template-columns: 1.6rem auto 1fr auto auto;
  background: var(--bg-sunken); border-radius: 8px; padding: .5rem .7rem;
}
.section-index { color: var(--text-dim); font-family: var(--mono); font-size: .8rem; }
.section-riff { font-weight: 600; }
.section-notes { font-family: var(--mono); font-size: .8rem; color: var(--text-dim); text-align: right; }
.section-actions { display: flex; gap: .3rem; }
.add-section {
  display: flex; gap: .8rem; align-items: center; flex-wrap: wrap;
  margin-top: 1rem; padding-top: .9rem; border-top: 1px solid var(--line);
}

@media (max-width: 620px) {
  .song-section { grid-template-columns: 1.4rem 1fr; }
  .section-notes, .section-actions { grid-column: 1 / -1; text-align: left; }
}

/* ---- your data ---- */

.data-row {
  display: flex; gap: .5rem; align-items: center; flex-wrap: wrap;
  margin-top: 1.1rem; padding-top: .9rem; border-top: 1px solid var(--line);
}
.data-row .muted { flex: 1 1 100%; margin: 0; font-size: .8rem; }
.hidden-file { display: none; }

/* ---- conversation ---- */

.converse { background: var(--bg-sunken); border: 1px solid var(--line); }
.privacy-note {
  border-left: 3px solid var(--warm); padding: .5rem .8rem;
  background: var(--bg); border-radius: 0 8px 8px 0; max-width: 62ch;
}

.working { margin: .9rem 0; }
.working-head { display: flex; align-items: center; gap: .5rem; }
.working-label { font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; color: var(--text-dim); }
.working-actions { display: flex; gap: .5rem; flex-wrap: wrap; }
.working-steps { margin: .6rem 0 0; padding-left: 1.2rem; font-size: .85rem; color: var(--text-dim); }

.transcript {
  display: grid; gap: .7rem; max-height: 50vh; overflow-y: auto;
  padding: .8rem 0; margin: .5rem 0;
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.transcript:empty { display: none; }
.bubble { background: var(--bg); border-radius: 10px; padding: .7rem .9rem; max-width: 62ch; }
.bubble p { margin: 0 0 .4em; }
.bubble p:last-child { margin-bottom: 0; }
.bubble-who {
  display: block; font-size: .7rem; text-transform: uppercase;
  letter-spacing: .07em; color: var(--text-dim); margin-bottom: .3rem;
}
.bubble.is-you { justify-self: end; background: var(--bg-raised); border: 1px solid var(--line); }
.bubble.is-app { border-left: 3px solid var(--accent-dim); }
.bubble.is-thinking { color: var(--text-dim); font-style: italic; }
.bubble.is-error { border-left: 3px solid var(--danger); color: var(--danger); }
.bubble-tools {
  font-size: .75rem; color: var(--text-dim); margin-top: .5rem;
  padding-top: .4rem; border-top: 1px dashed var(--line);
}

.suggestion-chips { display: flex; gap: .4rem; flex-wrap: wrap; margin: .6rem 0; }
.suggestion-chips .chip-btn { text-align: left; }

.ask-input {
  flex: 1; min-width: 200px; font: inherit; resize: vertical;
  background: var(--bg); color: var(--text);
  border: 1px solid var(--line); border-radius: var(--radius); padding: .6rem .8rem;
}
.ask-input:focus { outline: 2px solid var(--accent-dim); outline-offset: 1px; }
.converse .ask-row { display: flex; gap: .5rem; align-items: flex-start; margin-bottom: 0; }

/* ---- lessons ---- */

.lesson-list { display: grid; gap: .8rem; }
.lesson-card {
  background: var(--bg-sunken); border: 1px solid var(--line);
  border-left: 3px solid var(--line); border-radius: var(--radius); padding: 1rem;
}
.lesson-card.is-needs-work { border-left-color: var(--warm); }
.lesson-card.is-review { border-left-color: var(--accent-dim); }
.lesson-card.is-foundation, .lesson-card.is-next-step { border-left-color: var(--accent); }
.lesson-head { display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; }
.lesson-head h3 { margin: 0; }
.lesson-because { color: var(--text-dim); }
.lesson-goal { font-size: 1.02rem; }

.progress-bar { height: 8px; background: var(--bg-sunken); border-radius: 4px; overflow: hidden; margin: .6rem 0; }
.progress-fill { display: block; height: 100%; background: var(--accent-dim); }

.drill-stage {
  display: grid; justify-items: center; gap: .3rem;
  background: var(--bg-sunken); border-radius: var(--radius);
  padding: 1.6rem 1rem; margin: .8rem 0;
}
.drill-count { font-size: .8rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: .08em; }
.drill-bar { font-family: var(--mono); font-size: 3.4rem; font-weight: 700; line-height: 1; }
.drill-next { font-size: .9rem; }
.drill-heard { display: flex; gap: .3rem; flex-wrap: wrap; min-height: 1.6rem; }

@media (max-width: 620px) { .drill-bar { font-size: 2.6rem; } }

/* ---- today ---- */

.panel-hero { border-color: var(--accent-dim); }
.eyebrow { font-size: .72rem; text-transform: uppercase; letter-spacing: .1em; color: var(--text-dim); margin: 0 0 .2rem; }

.chord-picker { display: flex; flex-wrap: wrap; gap: .5rem; margin: 1rem 0; }
.chord-pick {
  font: inherit; font-family: var(--mono); font-size: 1.1rem; cursor: pointer;
  min-width: 3.4rem; padding: .7rem .9rem;
  background: var(--bg-sunken); color: var(--text);
  border: 1px solid var(--line); border-radius: var(--radius);
}
.chord-pick:hover { border-color: var(--accent-dim); }
.chord-pick.is-on { background: var(--accent-dim); color: #fff; border-color: transparent; font-weight: 700; }

.prog-list { display: grid; gap: .8rem; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.prog-card { background: var(--bg-sunken); border-radius: var(--radius); padding: .9rem 1rem; }
.prog-head { display: flex; align-items: baseline; gap: .5rem; flex-wrap: wrap; }
.prog-head h3 { margin: 0; font-size: 1.02rem; }
.prog-chords { font-family: var(--mono); font-size: 1.15rem; margin: .5rem 0; }

.today-links { display: flex; gap: .5rem; flex-wrap: wrap; }

/* ---- folded-away setup ---- */

.setup-details { padding-top: .8rem; padding-bottom: 0; }
.setup-details > summary {
  cursor: pointer; color: var(--text-dim); font-size: .85rem;
  list-style: none; padding: .3rem 0;
}
.setup-details > summary::before { content: '▸ '; }
.setup-details[open] > summary::before { content: '▾ '; }
.setup-details > summary::-webkit-details-marker { display: none; }
.setup-details[open] { padding-bottom: .8rem; border-bottom: 1px solid var(--line); }

/* ---- scale shapes ---- */
.fb-root { fill: var(--accent); stroke: none; }
.scale-box .fb-dotnum { fill: var(--bg); font-weight: 600; }
.scale-lesson .note-roles { display: grid; gap: .4rem; margin: .8rem 0 0; padding: 0; list-style: none; }
.scale-lesson .note-roles li { display: flex; gap: .6rem; align-items: baseline; font-size: .9rem; }
.scale-lesson .note-roles .pitch {
  font-weight: 600; min-width: 2.4rem; color: var(--text);
  background: var(--bg-sunken); border-radius: 6px; padding: .1rem .4rem; text-align: center;
}
.scale-lesson .note-roles .why { color: var(--text-dim); }
.riff-card { border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem; margin-top: .9rem; }
.riff-card h4 { margin: 0 0 .2rem; }
.riff-why { margin: .6rem 0 0; padding-left: 1.1rem; color: var(--text-dim); font-size: .9rem; }
.riff-why li { margin: .25rem 0; }

/* ---- chord doctor: the detector thinking out loud ---- */
.chord-doctor { margin-top: 1rem; }
.chord-doctor > summary { cursor: pointer; font-size: .9rem; color: var(--text-dim); }
.chord-doctor[open] > summary { color: var(--text); margin-bottom: .6rem; }
.doctor-verdict { margin: .5rem 0; font-size: .95rem; line-height: 1.45; }
.doctor-verdict.is-good { color: var(--accent); font-weight: 600; }
.doctor-verdict.is-blocked { color: var(--text); }
.doctor-grid { display: flex; gap: 1.5rem; flex-wrap: wrap; margin: .6rem 0; }
.doctor-label { display: block; font-size: .72rem; letter-spacing: .06em; text-transform: uppercase; color: var(--text-dim); margin-top: .7rem; }
.doctor-value { font-size: 1.1rem; font-weight: 600; }
.doctor-chips, .doctor-candidates { display: flex; gap: .35rem; flex-wrap: wrap; margin-top: .3rem; }
.doctor-chroma { display: grid; gap: .25rem; margin-top: .3rem; }
.doctor-bar { display: grid; grid-template-columns: 2rem 1fr 2.6rem; align-items: center; gap: .5rem; font-size: .8rem; }
.doctor-bar-name { font-weight: 600; }
.doctor-bar-fill { height: 8px; border-radius: 4px; background: var(--accent); min-width: 2px; }
.doctor-bar-num { color: var(--text-dim); text-align: right; font-variant-numeric: tabular-nums; }

/* ============================================================
   Songs — the spine of the app
   ============================================================ */

.view-head { margin-bottom: 1.2rem; }
.view-head h2 { font-size: 1.6rem; margin-bottom: .25rem; }
.view-head .muted { max-width: 52ch; }

.song-list { display: grid; gap: .5rem; }
.song-row {
  display: flex; align-items: center; gap: 1rem; width: 100%;
  padding: .85rem 1rem; min-height: var(--tap);
  background: var(--bg-sunken); border: 1px solid var(--line);
  border-radius: var(--radius-sm); cursor: pointer;
  font: inherit; color: var(--text); text-align: left;
}
.song-row:hover { border-color: var(--accent-dim); }
.song-row.is-locked { opacity: .72; }
.song-row-main { display: grid; gap: .15rem; flex: 1; min-width: 0; }
.song-row-title { font-size: 1.05rem; font-weight: 600; }
.song-row-sub { font-size: .85rem; color: var(--text-dim); }
.song-row-tag {
  font-size: .72rem; letter-spacing: .05em; text-transform: uppercase;
  color: var(--text-dim); white-space: nowrap;
}

.unlock-card { border-color: var(--accent-dim); }
.unlock-card strong { color: var(--accent); }

/* ---- one song ---- */
.song-head { margin-bottom: 1.2rem; }
.song-head h2 { font-size: 1.75rem; margin: .5rem 0 .25rem; }
.btn-back {
  background: none; border: none; color: var(--text-dim);
  font: inherit; font-size: .9rem; cursor: pointer; padding: .4rem 0;
}
.btn-back:hover { color: var(--text); }
.song-why p { margin: 0; font-size: 1.02rem; }
.song-transport { margin: 1.2rem 0; }
.btn-big { font-size: 1.05rem; padding: .85rem 1.8rem; min-height: 52px; }

.level-switch { display: flex; gap: .35rem; flex-wrap: wrap; margin: .2rem 0 .6rem; }
.level-chip {
  background: var(--bg-sunken); border: 1px solid var(--line); color: var(--text-dim);
  padding: .45rem .85rem; border-radius: 999px; cursor: pointer;
  font: inherit; font-size: .85rem; min-height: 38px;
}
.level-chip.is-on { background: var(--accent); border-color: var(--accent); color: var(--bg); font-weight: 600; }
.level-blurb { margin: 0 0 .8rem; font-size: .88rem; }
.song-how { font-size: .95rem; }

.song-part-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; }
.song-part-head h3 { margin: 0 0 .6rem; }

/* The chart. Four bars to a line, the way anyone would write one out. */
.song-chart {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: .3rem;
  margin: .8rem 0; font-variant-numeric: tabular-nums;
}
.song-bar {
  display: flex; align-items: center; justify-content: center;
  padding: .7rem .3rem; min-height: 52px;
  background: var(--bg-sunken); border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font-size: 1.05rem; font-weight: 600; color: var(--text-dim);
}
.song-bar.is-here {
  background: var(--accent); border-color: var(--accent); color: var(--bg);
  transform: scale(1.04);
}

.chord-shapes { display: flex; gap: 1.2rem; flex-wrap: wrap; }
.chord-shape { display: grid; gap: .2rem; justify-items: center; }
.chord-shape-name { font-weight: 600; font-size: 1rem; }
.row-actions { display: flex; gap: .5rem; flex-wrap: wrap; }

@media (max-width: 620px) {
  .song-chart { grid-template-columns: repeat(2, 1fr); }
  .view-head h2 { font-size: 1.4rem; }
  .song-head h2 { font-size: 1.45rem; }
}

.setup-details { margin-top: 2.5rem; padding-top: 1rem; border-top: 1px solid var(--line); }
.setup-details > summary { color: var(--text-dim); font-size: .88rem; cursor: pointer; }
.setup-details label { display: block; margin: .8rem 0 .2rem; font-size: .9rem; }

/* ============================================================
   The course — visible from the first second, no setup
   ============================================================ */

.step-list { display: grid; gap: .5rem; }

.step-card {
  background: var(--bg-raised); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden;
}
.step-card.is-current { border-color: var(--accent); }
.step-card.is-done { opacity: .68; }
.step-card.is-placed { border-style: dashed; border-color: var(--accent-dim); }
.step-card.is-verified { border-color:color-mix(in srgb,var(--accent) 55%,var(--line)); }

.step-head {
  display: flex; align-items: center; gap: .9rem; width: 100%;
  padding: .9rem 1rem; min-height: var(--tap);
  background: none; border: none; cursor: pointer;
  font: inherit; color: var(--text); text-align: left;
}
.step-number {
  display: grid; place-items: center; flex: none;
  width: 30px; height: 30px; border-radius: 50%;
  background: var(--bg-sunken); border: 1px solid var(--line);
  font-size: .85rem; font-weight: 600; color: var(--text-dim);
}
.step-card.is-current .step-number { background: var(--accent); border-color: var(--accent); color: var(--bg); }
.step-card.is-done .step-number { background: var(--accent-dim); border-color: var(--accent-dim); color: #fff; }
.step-card.is-placed .step-number { border-color: var(--accent-dim); color: var(--accent); }
.step-card.is-verified .step-number { background:color-mix(in srgb,var(--accent) 14%,var(--bg-sunken)); color:var(--accent); }
.step-head-text { display: grid; gap: .1rem; min-width: 0; }
.step-title { font-size: 1.02rem; font-weight: 600; line-height: 1.3; }
.step-kind { font-size: .72rem; letter-spacing: .06em; text-transform: uppercase; color: var(--text-dim); }
.step-placement { font-size:.72rem; color:var(--accent); }
.step-placement.is-verified { color:var(--text-dim); }

/* Closed by default so the whole course fits on one screen as a map. */
.step-body { display: none; padding: 0 1rem 1.1rem; }
.step-card.is-open .step-body { display: block; }
.step-outcome { font-size: 1.02rem; margin-bottom: 1rem; }
.step-steps { padding-left: 1.3rem; margin: .4rem 0 1rem; }
.step-steps li { margin: .45rem 0; line-height: 1.5; }
.step-check, .step-watch {
  padding: .7rem .9rem; border-radius: var(--radius-sm); margin-bottom: .7rem;
  font-size: .92rem; line-height: 1.5;
}
.step-check { background: color-mix(in srgb, var(--accent) 12%, transparent); }
.step-watch { background: color-mix(in srgb, var(--warm) 14%, transparent); }
.step-expect { margin-bottom: .8rem; }

.step-shapes { display: flex; gap: 1.5rem; flex-wrap: wrap; margin: 0 0 1.2rem; }
.step-shape { display: grid; gap: .35rem; justify-items: center; }
.step-shape-name { font-weight: 600; font-size: 1.05rem; }
.step-shape .note-roles { justify-items: start; }

/* ---- licks: the vocabulary ---- */
.lick-card { border: 1px solid var(--line); border-radius: var(--radius-sm); padding: .9rem 1rem; margin-top: .8rem; }
.lick-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; }
.lick-head h4 { margin: 0; color: var(--text); text-transform: none; letter-spacing: 0; font-size: 1rem; }
.lick-tag { font-size: .74rem; letter-spacing: .05em; text-transform: uppercase; color: var(--text-dim); white-space: nowrap; }
.lick-use { font-size: .92rem; margin: .3rem 0 .6rem; }
.lick-why { font-size: .9rem; color: var(--text-dim); margin: .6rem 0; }
.lick-why strong { color: var(--text); }

/* ---- is my chord clean ---- */
.string-check { border-color: var(--accent-dim); }
.check-picker { display: flex; gap: .35rem; flex-wrap: wrap; margin: .6rem 0 .9rem; }
.check-verdict { font-size: 1rem; line-height: 1.5; margin: 0 0 .7rem; }
.check-verdict.is-good { color: var(--accent); font-weight: 600; }
.check-advice { font-size: .92rem; color: var(--text-dim); margin: .5rem 0 0; }
.check-strings { display: grid; gap: .2rem; margin: .6rem 0; }
.check-row {
  display: grid; grid-template-columns: 1.4rem 1.4rem 4.2rem 1fr;
  align-items: center; gap: .6rem;
  padding: .4rem .6rem; border-radius: var(--radius-sm);
  background: var(--bg-sunken); font-size: .9rem;
}
.check-mark { font-size: 1rem; text-align: center; }
.check-row.is-ringing .check-mark { color: var(--accent); }
.check-row.is-missing { background: color-mix(in srgb, var(--danger) 20%, transparent); }
.check-row.is-missing .check-mark { color: var(--danger); }
.check-row.is-unclear .check-mark { color: var(--warm); }
.check-row.is-not-played { opacity: .45; }
.check-string { font-weight: 600; text-align: center; }
.check-fret, .check-word { color: var(--text-dim); }

/* ---- today's session ---- */
.length-switch { margin-bottom: 1.2rem; }
.practice-item {
  background: var(--bg-raised); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1rem 1.1rem; margin-bottom: .7rem;
}
.practice-item.is-running { border-color: var(--accent); }
.practice-item.is-done { opacity: .6; }
.practice-item h3 { margin: .1rem 0 .4rem; font-size: 1.1rem; }
.item-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; }
.item-kind { font-size: .72rem; letter-spacing: .06em; text-transform: uppercase; color: var(--text-dim); }
.item-time { font-variant-numeric: tabular-nums; font-weight: 600; color: var(--text-dim); }
.practice-item.is-running .item-time { color: var(--accent); font-size: 1.15rem; }
.item-what { font-size: .96rem; }