:root {
  color-scheme: dark;
  --background: #101114;
  --surface: #181a1f;
  --surface-strong: #20232a;
  --text: #f5f6f8;
  --muted: #a8adb8;
  --border: #30343d;
  --accent: #f7b955;
  --accent-strong: #ffd18a;
  --accent-text: #221707;
  --note: #64b5d6;
  --note-fill: #1c3542;
  --focus: #82cfff;
  --shadow: 0 18px 50px rgb(0 0 0 / 20%);
  --radius-large: 22px;
  --radius-medium: 14px;
  --page-width: 1120px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--background);
}

body {
  min-width: 320px;
  margin: 0;
  background:
    radial-gradient(circle at 18% -10%, rgb(247 185 85 / 10%), transparent 32rem),
    var(--background);
  color: var(--text);
  line-height: 1.5;
}

button,
select {
  font: inherit;
}

button,
select {
  min-height: 44px;
}

button {
  color: inherit;
}

button:focus-visible,
select:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--focus) 55%, transparent);
  outline-offset: 2px;
}

.app-shell {
  width: min(100% - 32px, var(--page-width));
  margin-inline: auto;
  padding: 28px 0 max(28px, env(safe-area-inset-bottom));
}

.app-header {
  display: block;
  align-items: center;
  gap: 18px;
  margin-bottom: 26px;
  padding: 18px 20px;
  border: 1px solid color-mix(in srgb, var(--border) 82%, var(--accent));
  border-radius: var(--radius-large);
  background: linear-gradient(112deg, color-mix(in srgb, var(--surface) 95%, var(--accent) 5%), var(--surface));
  box-shadow: var(--shadow);
}

.brand {
  display: flex;
  align-items: center;
  gap: 16px;
  min-width: 0;
}

.brand__icon {
  flex: 0 0 auto;
  width: 130px;
  height: 130px;
  border: 0;
  border-radius: 0;
  background: transparent;
  object-fit: contain;
  box-shadow: none;
  mix-blend-mode: screen;
}

.brand__copy {
  min-width: 0;
}

.brand__eyebrow {
  display: block;
  margin-bottom: 4px;
  color: var(--accent-strong);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  line-height: 1.2;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(1.35rem, 2.5vw, 2rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
}

.brand h1 {
  font-size: clamp(1.55rem, 2.7vw, 2.2rem);
}

.brand__feature,
.brand__lite-note {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.35;
}

.brand__edition {
  display: inline-flex;
  align-items: center;
  margin-left: 0.55em;
  padding: 0.32em 0.5em;
  border: 1px solid color-mix(in srgb, var(--accent) 52%, var(--border));
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 12%, var(--surface));
  color: var(--accent-strong);
  font-size: 0.4em;
  font-weight: 700;
  line-height: 1;
  vertical-align: middle;
  white-space: nowrap;
}

.pro-exit {
  color: var(--accent-strong);
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.pro-exit-form {
  display: inline;
  margin: 0;
}

button.pro-exit {
  padding: 0;
  border: 0;
  background: transparent;
  font: inherit;
  cursor: pointer;
}

.pro-exit:hover {
  text-decoration: underline;
}

.penta-lite .practice,
.penta-lite .lesson-player,
.penta-lite .pattern-export {
  display: none !important;
}

.penta-lite .segmented-control .lite-pro-option {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 1px solid color-mix(in srgb, var(--border) 72%, var(--accent));
  background: color-mix(in srgb, var(--surface-strong) 88%, var(--accent));
  color: color-mix(in srgb, var(--muted) 82%, var(--text));
  cursor: not-allowed;
  opacity: 0.78;
}

.penta-lite .segmented-control .lite-pro-option:hover {
  color: color-mix(in srgb, var(--muted) 82%, var(--text));
}

.lite-pro-option__badge {
  display: inline-flex;
  align-items: center;
  min-height: 18px;
  padding: 0 5px;
  border: 1px solid color-mix(in srgb, var(--accent) 64%, var(--border));
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 16%, var(--surface));
  color: var(--accent-strong);
  font-size: 0.59rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  line-height: 1;
}

.lite-pro-access {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 1fr);
  align-items: center;
  gap: 16px 28px;
  margin: -8px 0 22px;
  padding: 20px;
  border: 1px solid color-mix(in srgb, var(--accent) 45%, var(--border));
  border-radius: 18px;
  background: linear-gradient(110deg, color-mix(in srgb, var(--accent) 9%, var(--surface)), var(--surface));
  scroll-margin-top: 16px;
}

.lite-pro-access__eyebrow {
  display: block;
  margin-bottom: 4px;
  color: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lite-pro-access h2,
.lite-pro-access p {
  margin: 0;
}

.lite-pro-access h2 {
  font-size: 1.08rem;
}

.lite-pro-access p {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.84rem;
}

.lite-pro-access .lite-pro-access__subscribe {
  margin-top: 10px;
  font-size: 0.76rem;
}

.lite-pro-access a {
  color: var(--accent-strong);
  text-underline-offset: 3px;
}

.lite-pro-access a:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

.lite-pro-access__form {
  display: grid;
  min-width: 0;
  gap: 7px;
}

.lite-pro-access__form > label {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.lite-pro-access__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
}

.lite-pro-access input,
.lite-pro-access button {
  min-height: 44px;
  border-radius: 11px;
}

.lite-pro-access input {
  min-width: 0;
  padding: 0 12px;
  border: 1px solid var(--border);
  background: var(--background);
  color: var(--text);
  font: inherit;
}

.lite-pro-access input:focus {
  outline: 2px solid color-mix(in srgb, var(--accent) 70%, transparent);
  outline-offset: 1px;
}

.lite-pro-access button {
  padding: 0 16px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--accent-text);
  font: inherit;
  font-weight: 750;
  cursor: pointer;
}

.lite-pro-access button:hover {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
}

.lite-pro-access__form > button {
  justify-self: start;
  min-height: 32px;
  padding: 2px 0;
  border: 0;
  background: transparent;
  color: var(--accent-strong);
  font-size: 0.78rem;
}

.lite-pro-access__form > button:hover {
  background: transparent;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.lite-pro-access #pro-code {
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.25em;
}

.lite-pro-access__notice {
  grid-column: 1 / -1;
  padding: 10px 12px;
  border: 1px solid color-mix(in srgb, var(--accent) 48%, var(--border));
  border-radius: 10px;
  background: color-mix(in srgb, var(--accent) 10%, var(--surface));
  color: var(--text) !important;
  font-size: 0.84rem;
}

@media (max-width: 760px) {
  .lite-pro-access {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
    margin-top: -6px;
    padding: 16px;
  }
}

@media (max-width: 520px) {
  .lite-pro-access__row {
    grid-template-columns: minmax(0, 1fr);
  }

  .lite-pro-access button {
    width: 100%;
  }
}

.brand__lite-note {
  margin-top: 3px;
  font-size: 0.72rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: border-color 160ms ease, background-color 160ms ease, transform 160ms ease;
}

.button:hover {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
  background: var(--surface-strong);
}

.button:active {
  transform: translateY(1px);
}

.training-sections {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 12px;
}

.training-sections button {
  gap: 8px;
}

.builder-toolbar { display: grid; gap: 8px; min-width: 0; }
.builder-presets { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; }
.builder-toolbar select, .builder-sheet select, .builder-sheet input:not([type="checkbox"]):not([type="range"]), .builder-toolbar button, .builder-sheet button {
  min-width: 0; min-height: 44px; padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; background: var(--surface-strong); color: var(--text); font: inherit; font-size: 14px;
}
.builder-toolbar p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.4; overflow-wrap: anywhere; }
.builder-views { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; }
.builder-views button[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.lesson-modal .lesson-player.lesson-player--builder { min-height: min(540px, calc(100dvh - 24px)); }
.lesson-player--builder > .lesson-player__harmony { display: none; }
.lesson-player--builder[data-builder-view="notation"] > .lesson-player__board,
.lesson-player--builder[data-builder-view="board"] > .lesson-player__notation,
.lesson-player--builder .lesson-player__action-row,
.lesson-player--builder .lesson-player__play-row { display: none; }
.lesson-player--builder .lesson-player__lab { padding: 6px; }
.lesson-player--builder .lesson-player__track-wrap { max-height: 88px; }
.builder-dock { position: sticky; bottom: 0; display: flex; align-items: center; gap: 6px; padding: 8px 0 max(4px, env(safe-area-inset-bottom)); background: var(--surface); z-index: 2; }
.builder-dock #lesson-player-play { display: flex; align-items: center; justify-content: center; gap: 8px; flex: 1; min-width: 74px; min-height: 44px; font-size: 14px; }
.builder-dock .lesson-player__tempo-control { gap: 0; flex: 0 0 auto; }
.builder-dock .lesson-player__control-label { display: none; }
.builder-dock .lesson-player__stepper { height: 44px; gap: 0; }
.builder-dock .lesson-player__stepper button { width: 36px; height: 44px; }
.builder-dock .lesson-player__stepper output { min-width: 32px; font-size: 14px; }
.builder-dock #lesson-player-loop-toggle { min-width: 44px; min-height: 44px; }
#lesson-player.lesson-player--builder .builder-dock .lesson-player__tempo-control { display: flex; align-self: center; margin: 0; padding: 0; transform: none; }
#lesson-player.lesson-player--builder .builder-dock .lesson-player__stepper { display: grid; grid-template-columns: 32px 36px 32px; align-items: center; height: 44px; }
#lesson-player.lesson-player--builder .builder-dock .lesson-player__stepper button { width: 32px; height: 44px; }
#builder-sheet-message { margin: 0 0 8px; padding: 8px; font-size: 13px; line-height: 1.4; color: var(--accent); }
.builder-sheet { position: absolute; inset: 0; display: flex; flex-direction: column; background: var(--surface); z-index: 5; border-radius: inherit; padding: 8px; min-width: 0; }
.builder-sheet > header { display: flex; justify-content: space-between; align-items: center; gap: 8px; padding-bottom: 8px; }
.builder-sheet > header strong { font-size: 16px; }
.builder-sheet-body { overflow-y: auto; overscroll-behavior: contain; min-height: 0; padding-bottom: max(8px, env(safe-area-inset-bottom)); }
.builder-sheet details { border-bottom: 1px solid var(--border); }
.builder-sheet summary { cursor: pointer; min-height: 48px; padding: 14px 8px; font-size: 14px; font-weight: 600; }
.builder-fields { display: grid; padding: 0 8px 8px; }
.builder-row { display: grid; grid-template-columns: minmax(90px, .85fr) minmax(0, 1.15fr); align-items: center; gap: 8px; padding: 4px 0; font-size: 14px; }
.builder-row > span { color: var(--muted); }
.builder-row select, .builder-row input { width: 100%; }
.builder-row[hidden], .builder-toolbar[hidden], .builder-sheet[hidden], .builder-dock[hidden] { display: none; }
.builder-boxes { display: flex; gap: 2px; }
.builder-boxes label { flex: 1; position: relative; min-width: 0; }
.builder-boxes input { position: absolute; opacity: 0; inset: 0; cursor: pointer; }
.builder-boxes span { display: grid; place-items: center; min-height: 44px; border: 1px solid var(--border); border-radius: 6px; }
.builder-boxes input:checked + span { background: var(--accent); color: var(--accent-text); }
.builder-boxes input:focus-visible + span { outline: 2px solid var(--focus); outline-offset: 2px; }
.builder-hint { font-size: 12px; line-height: 1.5; color: var(--muted); }
.builder-mixer > div { display: grid; gap: 4px; }
.builder-mixer output { color: var(--muted); font-size: 12px; text-align: right; }
.builder-save { display: grid; gap: 8px; padding: 12px 8px 4px; font-size: 14px; }
.builder-save > div { display: flex; flex-wrap: wrap; gap: 6px; }
.builder-save p { margin: 0; color: var(--muted); font-size: 12px; }
#builder-loop-modes .lesson-player__mode-control { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin: 8px 0; }
#builder-loop-modes .lesson-player__control-label { font-size: 14px; }
#builder-loop-modes button { min-height: 44px; width: auto; }
.has-builder-sheet { overflow: hidden !important; }
.has-builder-sheet > :not(.builder-sheet) { visibility: hidden; }
@media (max-width: 520px) {
  .lesson-modal .lesson-player.lesson-player--builder { min-height: min(540px, calc(100dvh - 16px)); }
  .lesson-player--builder .lesson-player__notation svg { max-height: 230px; }
  .lesson-player--builder .lesson-player__board .fretboard { max-height: 280px; }
  .builder-toolbar #builder-settings { padding-inline: 10px; }
}

@media print {
  .training-sections {
    display: none;
  }
}

[data-training-control][hidden] {
  display: none;
}

.toolbar {
  display: flex;
  align-items: end;
  flex-wrap: wrap;
  gap: 18px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-large);
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  box-shadow: var(--shadow);
}

.instrument-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px;
  margin: 12px 0 22px;
  padding: 13px 16px;
  border: 1px solid color-mix(in srgb, var(--border) 84%, var(--note));
  border-radius: var(--radius-medium);
  background: color-mix(in srgb, var(--surface) 94%, var(--note) 6%);
}

.instrument-card__eyebrow {
  display: block;
  margin-bottom: 3px;
  color: var(--note);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.instrument-card h2 {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.2;
}

.instrument-card p {
  margin: 0;
  color: var(--text);
  font-size: 0.88rem;
  font-weight: 650;
  text-align: right;
}

.field {
  display: grid;
  gap: 7px;
  min-width: 160px;
}

.field__label,
.mode-switch legend {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

select {
  width: 100%;
  padding: 0 40px 0 13px;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: var(--surface-strong);
  color: var(--text);
  cursor: pointer;
}

.mode-switch {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.mode-switch legend {
  margin-bottom: 7px;
}

.practice {
  display: grid;
  gap: 14px;
  margin: 18px 0;
  padding: 18px;
  border: 1px solid color-mix(in srgb, var(--accent) 45%, var(--border));
  border-radius: var(--radius-large);
  background: color-mix(in srgb, var(--accent) 8%, var(--surface));
}

.practice__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.practice__intro {
  min-width: 0;
}

.practice__eyebrow {
  display: block;
  margin-bottom: 2px;
  color: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.practice h2 {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.2;
}

.practice p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.practice-tabs {
  display: inline-grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  min-height: 42px;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--background);
}

.practice-tab {
  min-height: 34px;
  padding: 0 12px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease;
}

.practice-tab:hover {
  color: var(--text);
}

.practice-tab.is-active {
  background: color-mix(in srgb, var(--accent) 18%, var(--surface));
  color: var(--accent-strong);
}

.practice-tab:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.practice-tab__soon {
  margin-left: 4px;
  font-size: 0.66rem;
  font-weight: 650;
  text-transform: uppercase;
}

.practice-panel {
  min-width: 0;
}

.practice-panel[hidden] {
  display: none;
}

.practice-controls {
  display: flex;
  align-items: end;
  flex-wrap: wrap;
  gap: 8px;
  margin-left: auto;
}

.practice-exercises {
  min-width: 0;
  overflow: clip;
  border: 1px solid color-mix(in srgb, var(--accent) 22%, var(--border));
  border-radius: 14px;
  background: color-mix(in srgb, var(--accent) 5%, var(--surface));
}

.exercise-library {
  margin-bottom: 18px;
}

.exercise-library-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.5;
}

.exercise-library-note a {
  color: var(--accent-strong);
  white-space: nowrap;
}

.penta-lite .exercise-card__play,
.penta-lite .exercise-card__select {
  cursor: default;
  opacity: 1;
}

.penta-lite .exercise-card__play {
  font-size: 0.62rem;
  font-weight: 800;
}

.penta-lite .exercise-card,
.penta-lite .exercise-card:hover,
.penta-lite .exercise-card.is-active {
  border-color: var(--border);
  background: var(--surface);
  color: var(--muted);
  box-shadow: none;
}

.penta-lite .exercise-card.is-active .exercise-card__content strong {
  color: var(--muted);
}

.penta-lite .exercise-card__play,
.penta-lite .exercise-card.is-active .exercise-card__play {
  background: var(--accent);
  color: var(--accent-text);
}

.practice-exercises__summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto 18px;
  min-height: 48px;
  align-items: center;
  gap: 10px;
  padding: 0 12px;
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  list-style: none;
}

.practice-exercises__summary::-webkit-details-marker {
  display: none;
}

.practice-exercises__summary-value {
  color: var(--muted);
  max-width: min(48vw, 230px);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.72rem;
  font-weight: 650;
  letter-spacing: normal;
  text-transform: none;
}

.practice-exercises__summary svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.9;
  transition: transform 160ms ease;
}

.practice-exercises[open] .practice-exercises__summary {
  border-bottom: 1px solid color-mix(in srgb, var(--border) 82%, transparent);
}

.practice-exercises[open] .practice-exercises__summary svg {
  transform: rotate(180deg);
}

.practice-exercises__drawer {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: stretch;
  gap: 12px;
  padding: 12px;
}

.exercise-levels {
  display: grid;
  min-width: 0;
  gap: 0;
}

.exercise-course-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.exercise-course-tab {
  display: inline-flex;
  min-width: 0;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease, box-shadow 160ms ease;
}

.exercise-course-tab:hover {
  border-color: color-mix(in srgb, var(--accent) 62%, var(--border));
}

.exercise-course-tab:focus-visible {
  outline: 2px solid var(--accent-strong);
  outline-offset: 2px;
}

.exercise-course-tab.is-active {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 16%, var(--surface));
  box-shadow: inset 0 -2px 0 var(--accent);
  color: var(--accent-strong);
}

.exercise-level {
  min-width: 0;
  border: 0;
  background: transparent;
}

.exercise-level:not([open]) {
  display: none;
}

.exercise-level__summary {
  display: none;
}

.exercise-level__summary::-webkit-details-marker {
  display: none;
}

.exercise-level__summary-index {
  display: inline-grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border-radius: 9px;
  background: color-mix(in srgb, var(--accent) 22%, var(--surface));
  color: var(--accent-strong);
  font-size: 0.7rem;
  font-weight: 750;
  letter-spacing: 0.07em;
}

.exercise-level__summary-copy {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.exercise-level__summary-copy strong {
  color: var(--text);
  font-size: 0.88rem;
}

.exercise-level__summary-copy span {
  color: var(--muted);
  font-size: 0.75rem;
}

.exercise-level__summary svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: var(--accent-strong);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.9;
  transition: transform 160ms ease;
}

.exercise-level[open] .exercise-level__summary {
  border-bottom: 1px solid color-mix(in srgb, var(--border) 82%, transparent);
}

.exercise-level[open] .exercise-level__summary svg {
  transform: rotate(180deg);
}

.exercise-level__drawer {
  display: grid;
  gap: 11px;
  padding-top: 12px;
}

.exercise-section + .exercise-section {
  padding-top: 10px;
  border-top: 1px solid color-mix(in srgb, var(--border) 82%, transparent);
}

.exercise-section__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin: 0 2px 7px;
}

.exercise-section__header strong {
  color: var(--text);
  font-size: 0.82rem;
}

.exercise-section__header span {
  color: var(--muted);
  font-size: 0.72rem;
}

.exercise-list {
  display: grid;
  gap: 8px;
  min-width: 0;
}

.exercise-list__heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin: 8px 2px 0;
  padding-bottom: 5px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  font-size: 0.78rem;
  line-height: 1.3;
}

.exercise-list__heading:first-child {
  margin-top: 0;
}

.exercise-list__heading span {
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 500;
  white-space: nowrap;
}

.exercise-card {
  display: flex;
  width: 100%;
  min-height: 58px;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: background-color 160ms ease, border-color 160ms ease;
}

.exercise-card[hidden] {
  display: none;
}

.exercise-card:hover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, var(--surface));
}

.exercise-card.is-active {
  border-color: var(--accent-strong);
  background: color-mix(in srgb, var(--accent) 12%, var(--surface));
  box-shadow: inset 3px 0 0 var(--accent);
}

.exercise-card.is-active .exercise-card__icon {
  background: color-mix(in srgb, var(--accent) 38%, var(--surface));
  color: var(--accent-strong);
}

.exercise-card.is-active .exercise-card__content strong {
  color: var(--accent-strong);
}

.exercise-card__icon {
  display: inline-grid;
  width: 32px;
  height: 32px;
  flex: 0 0 32px;
  place-items: center;
  border-radius: 9px;
  background: color-mix(in srgb, var(--accent) 15%, var(--surface));
  color: var(--accent-strong);
}

.exercise-card__icon svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.exercise-card__content {
  display: grid;
  gap: 1px;
  min-width: 0;
}

.exercise-card__content strong {
  overflow: hidden;
  font-size: 0.86rem;
  line-height: 1.2;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.exercise-card__content span {
  color: var(--muted);
  overflow: hidden;
  font-size: 0.74rem;
  line-height: 1.2;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.exercise-run {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border: 1px solid color-mix(in srgb, var(--border) 86%, var(--accent));
  border-radius: 12px;
  background: color-mix(in srgb, var(--panel) 88%, var(--accent) 3%);
}

.exercise-run p {
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
  text-align: left;
}

.exercise-run__button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 14px;
  border: 1px solid var(--accent);
  border-radius: 12px;
  background: var(--accent);
  color: var(--accent-text);
  font: inherit;
  font-size: 0.86rem;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 160ms ease, border-color 160ms ease;
}

.exercise-run__button:hover {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
}

.exercise-run__button.is-playing {
  border-color: var(--border);
  background: var(--background);
  color: var(--text);
}

.exercise-run__button.is-loading {
  cursor: wait;
  opacity: 0.72;
}

.lesson-player {
  position: sticky;
  top: 12px;
  z-index: 8;
  display: grid;
  gap: 12px;
  margin: 14px 0;
  padding: 14px;
  scroll-margin-top: 12px;
  border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--border));
  border-radius: var(--radius-medium);
  background: color-mix(in srgb, var(--surface-strong) 94%, var(--accent) 6%);
  box-shadow: var(--shadow);
}

.lesson-player[hidden] {
  display: none;
}

.lesson-player.is-playing {
  border-color: var(--accent);
}

.lesson-player__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.lesson-player__controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.7fr);
  gap: 8px;
}

.lesson-player__button {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: var(--background);
  color: var(--text);
  font: inherit;
  font-size: 0.84rem;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease;
}

.lesson-player__button--play {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-text);
}

.lesson-player__button--play:hover:not(:disabled) {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
}

.lesson-player__button--stop:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent-strong);
}

.lesson-player__button:disabled {
  cursor: default;
  opacity: 0.55;
}

.lesson-player__loop {
  display: grid;
  gap: 8px;
  padding: 10px;
  border: 1px solid color-mix(in srgb, var(--border) 82%, var(--accent) 18%);
  border-radius: 12px;
  background: color-mix(in srgb, var(--background) 86%, var(--accent) 14%);
}

.lesson-player__loop-header,
.lesson-player__range {
  display: flex;
  align-items: center;
  gap: 8px;
}

.lesson-player__loop-header {
  justify-content: space-between;
}

.lesson-player__loop-label,
.lesson-player__range-label {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lesson-player__loop-toggle,
.lesson-player__scope,
.lesson-player__marker,
.lesson-player__range-reset {
  appearance: none;
  min-height: 32px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--background);
  color: var(--text);
  font: inherit;
  font-size: 0.77rem;
  font-weight: 700;
  cursor: pointer;
  transition: border-color 160ms ease, background-color 160ms ease, color 160ms ease, box-shadow 160ms ease;
}

.lesson-player__loop-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 0 9px;
}

.lesson-player__loop-toggle.is-active,
.lesson-player__scope.is-active,
.lesson-player__marker.is-selecting {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-text);
}

.lesson-player__loop-scopes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
}

.lesson-player__scope {
  padding: 0 8px;
}

.lesson-player__range {
  min-height: 36px;
  padding-top: 2px;
  border-top: 1px solid color-mix(in srgb, var(--border) 82%, transparent);
}

.lesson-player__marker {
  min-width: 50px;
  padding: 0 8px;
}

.lesson-player__range-arrow {
  color: var(--accent-strong);
  font-weight: 750;
}

.lesson-player__range-reset {
  margin-left: auto;
  padding: 0 8px;
  color: var(--muted);
}

.lesson-player__loop-toggle:hover,
.lesson-player__scope:hover,
.lesson-player__marker:hover,
.lesson-player__range-reset:hover {
  border-color: var(--accent);
}

.lesson-player__loop-toggle:focus-visible,
.lesson-player__scope:focus-visible,
.lesson-player__marker:focus-visible,
.lesson-player__range-reset:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.lesson-player__eyebrow {
  display: block;
  margin-bottom: 2px;
  color: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lesson-player h3,
.lesson-player p {
  margin: 0;
}

.lesson-player h3 {
  font-size: 1rem;
}

.lesson-player__status {
  margin-top: 3px !important;
  color: var(--text);
  font-size: 0.84rem;
  font-weight: 650;
}

.lesson-player__note {
  margin-top: 2px !important;
  color: var(--muted);
  font-size: 0.79rem;
}

.lesson-player__progress {
  flex: 0 0 auto;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--accent-strong);
  font-size: 0.8rem;
  font-weight: 750;
}

.lesson-player__board {
  min-height: 110px;
}

.lesson-player__board .fretboard {
  width: min(100%, 900px);
  margin-inline: auto;
}

.lesson-player__route {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 5px;
  color: var(--muted);
  font-size: 0.76rem;
}

.lesson-player__route-hint {
  margin: 0 !important;
  color: var(--muted);
  font-size: 0.76rem;
}

.lesson-player__route-step {
  position: relative;
  appearance: none;
  min-width: 28px;
  padding: 3px 6px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: color-mix(in srgb, var(--background) 78%, transparent);
  color: inherit;
  font: inherit;
  text-align: center;
  cursor: pointer;
  transition: border-color 160ms ease, background-color 160ms ease, color 160ms ease;
}

.lesson-player__route-step:hover {
  border-color: var(--accent);
  color: var(--text);
}

.lesson-player__route-step:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.lesson-player__route-step.is-current {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 750;
}

.lesson-player__route-step.is-in-range:not(.is-current) {
  border-color: color-mix(in srgb, var(--accent) 62%, var(--border));
  background: color-mix(in srgb, var(--accent) 20%, var(--background));
  color: var(--text);
}

.lesson-player__route-step[data-range-marker] {
  padding-left: 22px;
}

.lesson-player__route-step[data-range-marker]::before {
  position: absolute;
  top: 50%;
  left: 5px;
  transform: translateY(-50%);
  color: var(--accent-strong);
  content: attr(data-range-marker);
  font-size: 0.57rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.lesson-player__route-step.is-current[data-range-marker]::before {
  color: inherit;
}

/* Loop laboratory: the track is the primary interaction, with A/B handles
   and transport kept in one visual flow. */
.lesson-player {
  gap: 18px;
  padding: clamp(18px, 2.4vw, 34px);
  border-color: color-mix(in srgb, var(--border) 78%, var(--accent) 22%);
  border-radius: 22px;
  background:
    radial-gradient(circle at 50% 34%, color-mix(in srgb, var(--accent) 8%, transparent), transparent 42%),
    color-mix(in srgb, var(--surface) 93%, #000 7%);
}

.lesson-player__header {
  align-items: center;
}

.lesson-player__eyebrow {
  margin-bottom: 7px;
  font-size: 0.76rem;
}

.lesson-player h3 {
  font-size: clamp(1.24rem, 2.1vw, 1.65rem);
  letter-spacing: -0.02em;
}

.lesson-player__note {
  margin-top: 6px !important;
  font-size: 0.94rem;
}

.lesson-player__status {
  margin-top: 3px !important;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 500;
}

.lesson-player__progress {
  padding: 6px 11px;
  font-size: 0.9rem;
}

.lesson-player__board {
  min-height: 180px;
}

.lesson-player__board .fretboard {
  width: min(100%, 1050px);
}

.lesson-player__lab {
  display: grid;
  gap: 18px;
  padding: clamp(16px, 2vw, 28px);
  border: 1px solid color-mix(in srgb, var(--border) 92%, var(--accent) 8%);
  border-radius: 24px;
  background: color-mix(in srgb, var(--background) 72%, var(--surface) 28%);
}

.lesson-player__track-row {

  align-items: center;
  gap: 18px;
}

.lesson-player__track-label,
.lesson-player__control-label {
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lesson-player__track-wrap {
  position: relative;
  overflow-x: auto;
  padding: 42px 0 3px;
  scrollbar-color: color-mix(in srgb, var(--accent) 45%, var(--border)) transparent;
}

.lesson-player__route {
  display: flex;
  flex-wrap: nowrap;
  align-items: stretch;
  width: max-content;
  min-width: 100%;
  gap: 0;
  padding: 0 1px;
  overflow: visible;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: color-mix(in srgb, var(--surface-strong) 92%, #000 8%);
  color: var(--muted);
  font-size: 0.86rem;
}

.lesson-player__route-hint {
  padding-left: min(136px, 20%);
  color: var(--muted);
  font-size: 0.78rem;
}

.lesson-player__route-step {
  display: inline-flex;
  min-width: 108px;
  min-height: 54px;
  align-items: center;
  justify-content: center;
  padding: 8px 11px;
  border: 0;
  border-right: 1px solid color-mix(in srgb, var(--border) 88%, transparent);
  border-radius: 0;
  background: transparent;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 650;
}

.lesson-player__route-step:first-child {
  border-radius: 9px 0 0 9px;
}

.lesson-player__route-step:last-child {
  border-right: 0;
  border-radius: 0 9px 9px 0;
}

.lesson-player__route-step:hover,
.lesson-player__route-step:focus-visible {
  z-index: 1;
  color: var(--text);
}

.lesson-player__route-step.is-in-range,
.lesson-player__route-step.is-in-range:not(.is-current) {
  border-top: 1px solid var(--accent);
  border-bottom: 1px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 15%, var(--surface-strong));
  color: var(--text);
}

.lesson-player__route-step.is-range-start {
  border-left: 1px solid var(--accent);
  border-radius: 9px 0 0 9px;
}

.lesson-player__route-step.is-range-end {
  border-right: 1px solid var(--accent);
  border-radius: 0 9px 9px 0;
}

.lesson-player__route-step.is-range-start.is-range-end {
  border-radius: 9px;
}

.lesson-player__route-step.is-current {
  box-shadow: inset 0 -3px 0 var(--accent);
  background: color-mix(in srgb, var(--accent) 20%, var(--surface-strong));
  color: var(--text);
}

.lesson-player__range-marker {
  position: absolute;
  top: -42px;
  z-index: 3;
  min-width: 38px;
  min-height: 38px;
  padding: 0 8px;
  border: 1px solid var(--accent);
  border-radius: 9px 9px 9px 2px;
  background: var(--accent);
  color: var(--accent-text);
  font: inherit;
  font-size: 0.96rem;
  font-weight: 850;
  cursor: pointer;
  box-shadow: 0 6px 12px rgb(0 0 0 / 24%);
}

.lesson-player__range-marker::after {
  position: absolute;
  bottom: -10px;
  width: 0;
  height: 0;
  border: 5px solid transparent;
  border-top-color: var(--accent);
  content: "";
}

.lesson-player__range-marker--start {
  left: -1px;
}

.lesson-player__range-marker--start::after {
  left: 10px;
}

.lesson-player__range-marker--end {
  right: -1px;
}

.lesson-player__range-marker--end::after {
  right: 10px;
}

.lesson-player__lab-options {
  display: grid;
  grid-template-columns: minmax(160px, 0.9fr) minmax(220px, 1.1fr);
  justify-content: center;
  gap: 40px;
}

.lesson-player__repeat-control,
.lesson-player__mode-control,
.lesson-player__tempo-control,
.lesson-player__count-in-control {
  display: grid;
  justify-items: center;
  gap: 8px;
}

.lesson-player__stepper,
.lesson-player__mode-switch {
  display: inline-grid;
  align-items: stretch;
  border: 1px solid var(--border);
  border-radius: 11px;
  overflow: hidden;
  background: color-mix(in srgb, var(--surface-strong) 88%, #000 12%);
}

.lesson-player__stepper {
  grid-template-columns: 42px 72px 42px;
}

.lesson-player__stepper button,
.lesson-player__mode-switch button,
.lesson-player__infinite {
  min-height: 40px;
  border: 0;
  border-right: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  font: inherit;
  cursor: pointer;
}

.lesson-player__stepper button:last-child,
.lesson-player__mode-switch button:last-child {
  border-right: 0;
}

.lesson-player__stepper output {
  display: grid;
  min-width: 0;
  place-items: center;
  border-right: 1px solid var(--border);
  color: var(--text);
  font-size: 1.12rem;
  font-weight: 800;
}

.lesson-player__infinite {
  min-height: 24px;
  border: 0;
  color: var(--accent-strong);
  font-size: 1.22rem;
  line-height: 1;
}

.lesson-player__infinite.is-active,
.lesson-player__mode-switch button.is-active,
.lesson-player__scope.is-active {
  background: var(--accent);
  color: var(--accent-text);
}

.lesson-player__mode-switch {
  grid-auto-flow: column;
  grid-auto-columns: minmax(104px, 1fr);
}

.lesson-player__mode-switch button {
  padding: 0 14px;
  font-size: 0.84rem;
  font-weight: 700;
}

.lesson-player__transport {
  display: grid;
  grid-template-columns: minmax(66px, 1fr) minmax(66px, 1fr) auto minmax(66px, 1fr) minmax(66px, 1fr);
  align-items: center;
  gap: 10px;
}

.lesson-player__transport-core {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border: 1px solid color-mix(in srgb, var(--border) 82%, var(--accent) 18%);
  border-radius: 22px;
  background: color-mix(in srgb, var(--surface-strong) 94%, #000 6%);
}

.lesson-player__transport-button {
  display: grid;
  min-height: 78px;
  align-content: center;
  justify-items: center;
  gap: 7px;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.78rem;
  cursor: pointer;
}

.lesson-player__transport-button > span:first-child {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text);
  font-size: 1.28rem;
}

.lesson-player__transport-button:hover:not(:disabled),
.lesson-player__transport-button.is-active {
  color: var(--accent-strong);
}

.lesson-player__transport-button:hover:not(:disabled) > span:first-child,
.lesson-player__transport-button.is-active > span:first-child {
  border-color: var(--accent);
}

.lesson-player__transport-button:disabled {
  cursor: default;
  opacity: 0.36;
}

.lesson-player__play-button {
  display: grid;
  width: 94px;
  height: 94px;
  place-items: center;
  align-content: center;
  gap: 2px;
  border: 0;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-text);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 10px 20px color-mix(in srgb, var(--accent) 22%, transparent);
}

.lesson-player__play-button > span:first-child {
  font-size: 1.82rem;
  line-height: 0.9;
}

.lesson-player__play-button:disabled {
  cursor: default;
  opacity: 0.58;
}

.lesson-player__session-settings {
  display: grid;
  grid-template-columns: minmax(220px, 0.9fr) minmax(280px, 1.1fr);
  justify-content: center;
  gap: 44px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

.lesson-player__tempo-control {
  grid-template-columns: auto auto auto;
  align-items: center;
  justify-content: center;
}

.lesson-player__tempo-control .lesson-player__control-label {
  grid-column: 1 / -1;
}

.lesson-player__unit {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
}

.lesson-player__count-in-control {
  justify-items: stretch;
}

.lesson-player__count-in-control .lesson-player__control-label {
  text-align: center;
}

.lesson-player__route-arrow {
  color: var(--muted);
}

.tempo-control,
.duration-control,
.sound-control {
  display: grid;
  gap: 5px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

.tempo-control {
  min-width: 218px;
}

.duration-control {
  min-width: 132px;
}

.sound-control {
  min-width: 184px;
}

.tempo-stepper {
  display: inline-flex;
  align-items: stretch;
  min-height: 44px;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--background);
}

.tempo-control__row {
  display: flex;
  align-items: stretch;
  gap: 8px;
}

.duration-selector,
.direction-selector,
.sound-selector {
  display: inline-grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  min-height: 44px;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--background);
}

.duration-selector button,
.direction-selector button,
.sound-selector button {
  min-width: 38px;
  min-height: 36px;
  padding: 0 7px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease;
}

.duration-selector button:hover,
.direction-selector button:hover,
.sound-selector button:hover {
  color: var(--text);
}

.duration-selector button.is-active,
.direction-selector button.is-active,
.sound-selector button.is-active {
  background: color-mix(in srgb, var(--accent) 18%, var(--surface));
  color: var(--accent-strong);
}

.sound-selector {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.mixer-control {
  display: grid;
  order: 2;
  flex: 1 0 100%;
  gap: 6px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

.mixer-control__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.mixer-control__header span:last-child {
  color: color-mix(in srgb, var(--muted) 72%, transparent);
  font-size: 0.68rem;
  letter-spacing: 0.025em;
}

.practice-mixer {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--background);
}

.mixer-channel {
  display: grid;
  align-items: center;
  grid-template-columns: minmax(140px, 0.42fr) minmax(180px, 1fr);
  gap: 8px;
  min-width: 0;
  padding: 8px;
  border: 1px solid color-mix(in srgb, var(--border) 76%, transparent);
  border-radius: 10px;
  background: color-mix(in srgb, var(--surface) 74%, var(--background));
  letter-spacing: normal;
  text-transform: none;
  transition: border-color 160ms ease, opacity 160ms ease;
}

.mixer-channel[hidden] {
  display: none;
}

.mixer-channel.is-muted {
  opacity: 0.66;
}

.mixer-channel.is-unavailable {
  opacity: 0.48;
  border-style: dashed;
}

.mixer-channel.is-unavailable .mixer-channel__mute,
.mixer-channel.is-unavailable .mixer-channel__fader input {
  cursor: not-allowed;
}

.mixer-control__hint {
  margin: 0;
  color: color-mix(in srgb, var(--muted) 90%, var(--accent));
  font-size: 0.7rem;
  font-weight: 650;
  letter-spacing: normal;
  text-transform: none;
}

.mixer-channel__header {
  display: grid;
  align-items: center;
  grid-template-columns: 22px minmax(0, 1fr) 30px;
  gap: 6px;
}

.mixer-channel__number {
  display: grid;
  width: 22px;
  height: 22px;
  place-items: center;
  border-radius: 7px;
  background: color-mix(in srgb, var(--accent) 16%, var(--surface));
  color: var(--accent-strong);
  font-size: 0.68rem;
  font-weight: 800;
}

.mixer-channel__header strong {
  overflow: hidden;
  color: var(--text);
  font-size: 0.76rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mixer-channel__mute {
  display: grid;
  width: 30px;
  height: 28px;
  padding: 0;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.72rem;
  font-weight: 800;
  cursor: pointer;
  transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease;
}

.mixer-channel__mute:hover {
  border-color: var(--accent);
  color: var(--text);
}

.mixer-channel__mute.is-active {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-text);
}

.mixer-channel__mute:focus-visible {
  outline: 2px solid var(--accent-strong);
  outline-offset: 2px;
}

.mixer-channel__fader {
  display: grid;
  align-items: center;
  grid-template-columns: minmax(56px, 1fr) 48px;
  gap: 7px;
}

.mixer-channel__fader input {
  width: 100%;
  min-width: 0;
  margin: 0;
  accent-color: var(--accent);
  cursor: pointer;
}

.mixer-channel__fader input:focus-visible {
  outline: 2px solid var(--accent-strong);
  outline-offset: 3px;
}

.mixer-channel__fader output {
  color: var(--muted);
  font-size: 0.68rem;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  text-align: right;
  white-space: nowrap;
}

.drum-pattern-control,
.accompaniment-chord-control,
.accompaniment-sound-control,
.bass-sound-control {
  display: flex;
  grid-column: 1 / -1;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: -1px;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 700;
}

.drum-pattern-control select,
.accompaniment-chord-control select,
.accompaniment-sound-control select,
.bass-sound-control select {
  width: auto;
  min-height: 32px;
  padding: 0 30px 0 10px;
  border-radius: 8px;
  font-size: 0.76rem;
  font-weight: 650;
}

.tempo-stepper__button {
  width: 40px;
  min-height: 42px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease;
}

.tempo-stepper__button:hover {
  background: var(--surface-strong);
  color: var(--accent-strong);
}

.tempo-stepper__button:active {
  background: color-mix(in srgb, var(--accent) 18%, var(--surface));
}

.tempo-stepper__value {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 0 10px;
  border-inline: 1px solid var(--border);
  color: var(--text);
  letter-spacing: normal;
  text-transform: none;
}

.tempo-stepper__value input {
  width: 42px;
  min-height: 36px;
  padding: 0;
  border: 0;
  appearance: textfield;
  -moz-appearance: textfield;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: normal;
  text-align: right;
}

.tempo-stepper__value input::-webkit-inner-spin-button,
.tempo-stepper__value input::-webkit-outer-spin-button {
  margin: 0;
  appearance: none;
}

.tempo-stepper__value span {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
}

.practice-toggle {
  display: inline-grid;
  width: 44px;
  min-height: 44px;
  padding: 0;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--background);
  color: var(--muted);
  cursor: pointer;
  transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease;
}

.practice-toggle:hover {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
  color: var(--text);
}

.practice-toggle.is-active {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 18%, var(--surface));
  color: var(--accent-strong);
  font-weight: 700;
}

.practice-toggle svg {
  width: 21px;
  height: 21px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.segmented-control {
  display: inline-grid;
  grid-template-columns: repeat(2, minmax(108px, 1fr));
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 13px;
  background: var(--background);
}

.segmented-control button {
  padding: 0 16px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease;
}

.segmented-control button:hover {
  color: var(--text);
}

.segmented-control button.is-active {
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 700;
}

.legend {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 9px 18px;
  padding: 18px 2px 16px;
  color: var(--muted);
  font-size: 0.9rem;
}

.legend > span {
  display: inline-flex;
  align-items: center;
}

.legend__dot {
  width: 12px;
  height: 12px;
  margin-right: 7px;
  border-radius: 50%;
}

.legend__dot--root {
  background: var(--accent);
}

.legend__scale {
  color: var(--text);
  font-weight: 650;
  letter-spacing: 0.03em;
}

.pattern-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 0 2px 14px;
}

.pattern-controls__sort {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.pattern-controls__label {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

.pattern-sort-selector {
  display: inline-grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  min-height: 40px;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: var(--background);
}

.pattern-sort-selector button {
  min-width: 82px;
  min-height: 32px;
  padding: 0 10px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease;
}

.pattern-sort-selector button:hover {
  color: var(--text);
}

.pattern-sort-selector button.is-active {
  background: color-mix(in srgb, var(--accent) 18%, var(--surface));
  color: var(--accent-strong);
}

.button--export {
  min-height: 40px;
  gap: 8px;
  padding-inline: 13px;
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 700;
  white-space: nowrap;
}

.pattern-export {
  display: flex;
  width: fit-content;
  margin: 18px auto 0;
}

.install-guide {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px;
  margin-top: 32px;
  padding: 17px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-medium);
  background: color-mix(in srgb, var(--surface) 94%, var(--note) 6%);
}

.install-guide__eyebrow {
  display: block;
  margin-bottom: 3px;
  color: var(--note);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.install-guide h2 {
  margin: 0;
  font-size: 1rem;
  line-height: 1.25;
}

.install-guide p {
  max-width: 720px;
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.4;
}

.install-guide__button {
  min-height: 38px;
  padding-inline: 13px;
  font-size: 0.84rem;
  white-space: nowrap;
}

.button--export svg {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentcolor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.print-metadata {
  display: none;
}

.patterns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.pattern {
  min-width: 0;
  padding: 18px 18px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-large);
  background: var(--surface);
}

.pattern--octave {
  border-color: color-mix(in srgb, var(--accent) 42%, var(--border));
}

.pattern:last-child:nth-child(odd) {
  grid-column: 1 / -1;
  width: calc(50% - 9px);
  justify-self: center;
}

.pattern__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 6px;
}

.pattern__title {
  font-size: 1rem;
  font-weight: 700;
}

.pattern__title-group {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.pattern__range {
  color: var(--muted);
  font-size: 0.86rem;
}

.pattern__play {
  display: inline-grid;
  width: 32px;
  height: 32px;
  min-height: 32px;
  padding: 0;
  place-items: center;
  flex: 0 0 32px;
  border: 1px solid var(--note);
  border-radius: 50%;
  appearance: none;
  -webkit-appearance: none;
  touch-action: manipulation;
  background: var(--note-fill);
  color: var(--text);
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease;
}

.pattern__play:hover {
  border-color: var(--note);
  background: var(--note-fill);
}

.pattern__play.is-playing {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-text);
}

.pattern__play.is-loading {
  cursor: wait;
  color: var(--muted);
  background: var(--surface-strong);
  border-color: var(--border);
}

.pattern__play:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.fretboard {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.fretboard__string {
  stroke: var(--muted);
  stroke-linecap: round;
}

.fretboard__fret {
  stroke: var(--border);
  stroke-width: 1.5;
}

.fretboard__edge {
  stroke: color-mix(in srgb, var(--muted) 72%, var(--border));
  stroke-width: 2;
}

.fretboard__string-label,
.fretboard__fret-label,
.fretboard__note-label {
  font-family: inherit;
  text-anchor: middle;
  dominant-baseline: middle;
}

.fretboard__string-label {
  fill: var(--text);
  font-size: 14px;
  font-weight: 700;
}

.fretboard__fret-label {
  fill: var(--muted);
  font-size: 12px;
}

.fretboard__note {
  fill: var(--note-fill);
  stroke: var(--note);
  stroke-width: 1.5;
}

.fretboard__note.is-root {
  fill: var(--accent);
  stroke: var(--accent);
}

.fretboard__note.is-playing {
  fill: var(--accent-strong);
  stroke: var(--text);
  stroke-width: 3;
  animation: fretboard-note-pulse 250ms ease-out;
}

#pentatonic-app.is-android .fretboard__note.is-playing {
  animation: none;
  filter: none;
}

@keyframes fretboard-note-pulse {
  from {
    stroke-width: 5;
    filter: drop-shadow(0 0 5px var(--accent));
  }

  to {
    stroke-width: 3;
    filter: drop-shadow(0 0 0 var(--accent));
  }
}

.fretboard__note-label {
  fill: var(--text);
  font-size: 12.5px;
  font-weight: 700;
}

.fretboard__note-label.is-root {
  fill: var(--accent-text);
}

.fretboard__note-label.is-playing {
  fill: var(--accent-text);
}

.pattern-order {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  min-height: 24px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.pattern-order strong {
  color: var(--text);
  font-weight: 650;
}

.pattern-order i {
  color: var(--accent);
  font-style: normal;
}

.app-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.82rem;
}

.noscript {
  width: min(100% - 32px, var(--page-width));
  margin: 20px auto;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-medium);
  background: var(--surface);
  color: var(--text);
}

@media (max-width: 720px) {
  .app-shell {
    width: min(100% - 22px, var(--page-width));
    padding-top: 18px;
  }

  .app-header {
    align-items: stretch;
    gap: 14px;
    margin-bottom: 20px;
    padding: 16px;
  }

  .brand__icon {
    width: 130px;
    height: 130px;
  }

  .instrument-card {
    grid-template-columns: minmax(0, 1fr);
    gap: 7px;
    margin: 10px 0 18px;
    padding: 13px 14px;
  }

  .instrument-card p {
    text-align: left;
  }

  .install-guide {
    grid-template-columns: minmax(0, 1fr);
    gap: 13px;
    margin-top: 24px;
    padding: 15px;
  }

  .install-guide__button {
    width: 100%;
  }

  .toolbar {
    align-items: stretch;
    flex-direction: column;
    gap: 14px;
    padding: 14px;
    border-radius: 17px;
  }

  .field,
  .mode-switch,
  .practice-controls,
  .segmented-control,
  .practice-tabs {
    width: 100%;
  }

  .practice {
    gap: 14px;
    padding: 14px;
    border-radius: 17px;
  }

  .practice__header,
  .practice-exercises__drawer {
    align-items: stretch;
    grid-template-columns: minmax(0, 1fr);
  }

  .practice__header {
    flex-direction: column;
  }

  .practice-controls {
    margin-left: 0;
  }

  .mixer-control,
  .practice-mixer {
    width: 100%;
  }

  .practice-mixer {
    grid-template-columns: minmax(0, 1fr);
  }

  .mixer-channel {
    grid-template-columns: minmax(122px, 0.9fr) minmax(126px, 1.1fr);
  }

  .exercise-run {
    grid-template-columns: minmax(0, 1fr);
    justify-items: stretch;
  }

  .exercise-run p {
    text-align: left;
  }

  .exercise-run__button {
    width: 100%;
  }

  .lesson-player {
    top: 8px;
    gap: 10px;
    margin: 12px 0;
    padding: 12px;
    scroll-margin-top: 8px;
  }

  .lesson-player__header {
    gap: 10px;
  }

  .lesson-player__lab {
    gap: 15px;
    padding: 14px;
    border-radius: 18px;
  }

  .lesson-player__track-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .lesson-player__track-wrap {
    padding-top: 39px;
  }

  .lesson-player__route {
    gap: 0;
    font-size: 0.78rem;
  }

  .lesson-player__route-step {
    min-width: 90px;
    min-height: 50px;
    padding-inline: 8px;
  }

  .lesson-player__route-hint {
    padding-left: 0;
  }

  .lesson-player__lab-options,
  .lesson-player__session-settings {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .lesson-player__transport {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 4px 8px;
  }

  .lesson-player__transport-core {
    order: 2;
    width: min(100%, 310px);
  }

  .lesson-player__transport > .lesson-player__transport-button:nth-of-type(-n + 2) {
    order: 1;
  }

  .lesson-player__transport > .lesson-player__transport-button:nth-of-type(n + 3) {
    order: 3;
  }

  .lesson-player__transport-button {
    min-width: 66px;
    min-height: 65px;
  }

  .lesson-player__transport-button > span:first-child {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }

  .lesson-player__play-button {
    width: 78px;
    height: 78px;
  }

  .patterns {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .pattern-controls {
    align-items: stretch;
    flex-direction: column;
  }

  .pattern-controls__sort {
    align-items: stretch;
    flex-direction: column;
  }

  .pattern-sort-selector {
    width: 100%;
  }

  .pattern-export {
    width: 100%;
  }

  .pattern,
  .pattern:last-child:nth-child(odd) {
    grid-column: auto;
    width: 100%;
    padding: 14px 10px 8px;
    border-radius: 17px;
  }

  .pattern__header {
    padding-inline: 6px;
  }

  .app-footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 5px;
  }
}

@media (max-width: 430px) {
  .app-header {
    gap: 12px;
  }

  .brand {
    gap: 12px;
  }

  .brand__eyebrow {
    font-size: 0.62rem;
  }

  .brand__icon {
    width: 96px;
    height: 112px;
  }

  .instrument-card p {
    font-size: 0.82rem;
  }

  .button--quiet {
    padding-inline: 12px;
  }

  .pattern__title {
    font-size: 0.95rem;
  }

  .pattern__range {
    font-size: 0.8rem;
  }

}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }

  .fretboard__note.is-playing {
    animation: none;
  }
}

/* Compact lesson player: one-screen control surface on phone and desktop. */
.lesson-player__assistive {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.lesson-player {
  --lesson-control-size: 26px;
  --lesson-control-icon-size: 16px;
  top: 8px;
  width: min(100%, 760px);
  gap: 8px;
  margin: 8px auto;
  padding: 10px;
  border-radius: 16px;
}

.lesson-player__header {
  align-items: center;
  gap: 8px;
}

.lesson-player h3 {
  font-size: clamp(1rem, 3.8vw, 1.22rem);
  line-height: 1.1;
}

.lesson-player__note {
  margin-top: 2px !important;
  font-size: 0.78rem;
  line-height: 1.2;
}

.lesson-player__note.is-pause-tip {
  color: var(--accent-strong);
  font-weight: 650;
}

.lesson-player__harmony {
  display: block;
  width: 100%;
  border-spacing: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-strong);
}

.lesson-player__harmony:not(:has(.lesson-player__key:not([hidden]))) {
  display: none;
}

.lesson-player__harmony tbody {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px;
}

.lesson-player__key {
  display: block;
  flex: 0 1 80px;
  min-width: 0;
}

.lesson-player__key th,
.lesson-player__key[hidden] {
  display: none;
}

.lesson-player__key td {
  display: block;
  padding: 0;
}

#lesson-player-boxes-control {
  flex: 0 0 78px;
}

#lesson-player-direction-control {
  flex: 0 1 180px;
}

.lesson-player__key select {
  appearance: none;
  width: 100%;
  min-width: 0;
  min-height: 32px;
  padding-inline: 4px 12px;
  border-radius: 8px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 10 6'%3E%3Cpath d='m1 1 4 4 4-4' fill='none' stroke='%2398a3b4' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 3px center;
  background-size: 8px 5px;
  font-size: 0.75rem;
}

.lesson-player__notation {
  overflow: hidden;
  padding: 4px 6px;
  border: 1px solid color-mix(in srgb, var(--border) 78%, var(--accent) 22%);
  border-radius: 10px;
  background: color-mix(in srgb, var(--surface-strong) 88%, var(--background) 12%);
  color: var(--text);
}

.lesson-player__notation svg {
  display: block;
  width: 100%;
  height: auto;
}

.lesson-notation__staff-line,
.lesson-notation__tab-line,
.lesson-notation__ledger-line,
.lesson-notation__bar-line,
.lesson-notation__repeat-line,
.lesson-notation__stem,
.lesson-notation__flag,
.lesson-notation__beam {
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
}

.lesson-notation__staff-line,
.lesson-notation__tab-line {
  opacity: 0.54;
  stroke-width: 0.8;
}

.lesson-notation__ledger-line,
.lesson-notation__bar-line,
.lesson-notation__repeat-line,
.lesson-notation__stem,
.lesson-notation__flag,
.lesson-notation__beam {
  stroke-width: 1.2;
}

.lesson-notation__repeat-line--1 {
  stroke-width: 2.4;
}

.lesson-notation__rest-block,
.lesson-notation__rest-dot,
.lesson-notation__repeat-dot {
  fill: currentColor;
}

.lesson-notation__rest-stroke {
  fill: none;
  stroke: currentColor;
  stroke-linecap: butt;
  stroke-linejoin: round;
  stroke-width: 2.5;
}

.lesson-notation__clef {
  fill: currentColor;
  font-family: "Noto Music", "Segoe UI Symbol", serif;
  font-size: 33px;
}

.lesson-notation__clef--treble-8vb {
  font-size: 39px;
}

.lesson-notation__octave,
.lesson-notation__tab-label {
  fill: var(--muted);
  font-family: inherit;
  font-size: 8px;
  font-weight: 750;
  letter-spacing: 0.08em;
}

.lesson-notation__octave {
  font-size: 9px;
}

.lesson-notation__octava-alta {
  fill: currentColor;
  font-family: inherit;
  font-size: 11px;
  font-weight: 750;
  letter-spacing: 0.04em;
}

.lesson-notation__octava-line {
  stroke: currentColor;
  stroke-dasharray: 3 3;
  stroke-width: 1;
}

.lesson-notation--tab-only .lesson-notation__staff-line,
.lesson-notation--tab-only .lesson-notation__clef,
.lesson-notation--tab-only .lesson-notation__ledger-line,
.lesson-notation--tab-only .lesson-notation__accidental,
.lesson-notation--tab-only .lesson-notation__octava-alta,
.lesson-notation--tab-only .lesson-notation__octava-line {
  display: none;
}

.lesson-notation__tab-label {
  font-size: 8px;
}

.lesson-notation__head,
.lesson-notation__tab-backdrop {
  fill: currentColor;
}

.lesson-notation__accidental {
  fill: currentColor;
  font-family: "Noto Music", "Segoe UI Symbol", sans-serif;
  font-size: 12px;
}

.lesson-notation__fret {
  fill: var(--surface-strong);
  font-family: inherit;
  font-size: 8px;
  font-weight: 800;
}

.lesson-notation__note.is-current {
  color: var(--accent);
}

.lesson-notation__note.is-current .lesson-notation__tab-backdrop {
  fill: var(--accent);
}

.lesson-notation__note.is-current .lesson-notation__fret {
  fill: var(--accent-text);
}

.lesson-player__progress {
  padding: 3px 7px;
  font-size: 0.72rem;
}

.lesson-player__board {
  min-height: 0;
}

.lesson-player__board .fretboard {
  width: 100%;
}

.lesson-player__lab {
  width: min(100%, 560px);
  gap: 8px;
  margin-inline: auto;
  padding: 9px;
  border-radius: 14px;
}

.lesson-player__track-row {
 
  gap: 8px;
}

.lesson-player__track-label,
.lesson-player__control-label {
  font-size: 0.6rem;
  letter-spacing: 0.06em;
}

.lesson-player__track-wrap {
  overflow: visible;
  padding: 25px 0 0;
}

.lesson-player__route {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(24px, 1fr));
  gap: 3px;
  width: 100%;
  min-width: 0;
  padding: 0;
  overflow: visible;
  border: 0;
  border-radius: 0;
  background: transparent;
}

.lesson-player__route-step {
  width: 100%;
  min-width: 0;
  min-height: 0;
  aspect-ratio: 1;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 6px !important;
  background: color-mix(in srgb, var(--surface-strong) 92%, #000 8%);
  font-size: clamp(0.56rem, 2.8vw, 0.72rem);
  font-weight: 750;
}

.lesson-player__route-entry {
  position: relative;
  display: flex;
  min-width: 0;
}

.lesson-player__route-step.is-in-range,
.lesson-player__route-step.is-in-range:not(.is-current) {
  border: 1px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 18%, var(--surface-strong));
}

.lesson-player__route-step.is-current {
  box-shadow: none;
}

.lesson-player__range-marker {
  top: -24px;
  min-width: 20px;
  min-height: 20px;
  padding: 0 4px;
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  border-radius: 5px 5px 5px 1px;
  background: color-mix(in srgb, var(--surface-strong) 92%, #000 8%);
  color: var(--text);
  font-size: 0.6rem;
  box-shadow: 0 3px 6px rgb(0 0 0 / 22%);
}

.lesson-player__range-marker::after {
  bottom: -6px;
  border-width: 3px;
  border-top-color: color-mix(in srgb, var(--accent) 45%, var(--border));
}

.lesson-player__range-marker.is-selecting {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-text);
  box-shadow: 0 4px 9px color-mix(in srgb, var(--accent) 30%, transparent);
}

.lesson-player__range-marker.is-selecting::after {
  border-top-color: var(--accent);
}

.lesson-player__range-marker {
  cursor: grab;
  touch-action: none;
  user-select: none;
}

.lesson-player__range-marker.is-dragging {
  cursor: grabbing;
  opacity: 0.38;
  filter: brightness(1.12);
}

.lesson-player__range-marker--drag-ghost {
  position: fixed !important;
  top: 0;
  right: auto !important;
  left: 0;
  z-index: 30;
  margin: 0;
  pointer-events: none;
  transform: translate(-50%, -50%) !important;
  cursor: grabbing;
  opacity: 1;
}

.lesson-player__range-marker--drag-ghost::after {
  display: none;
}

.lesson-player__route-step.is-drop-target {
  z-index: 2;
  border-color: var(--accent);
  outline: 2px solid color-mix(in srgb, var(--accent) 72%, transparent);
  outline-offset: 2px;
  background: color-mix(in srgb, var(--accent) 28%, var(--surface-strong));
  color: var(--text);
}

/* When A and B point to one fragment, keep both controls separate and make
   their pointers meet at the same route cell. */
.lesson-player__route-entry.is-range-single .lesson-player__range-marker--start {
  left: 50%;
  transform: translateX(calc(-100% - 2px));
}

.lesson-player__route-entry.is-range-single .lesson-player__range-marker--end {
  right: auto;
  left: 50%;
  transform: translateX(2px);
}

.lesson-player__route-entry.is-range-single .lesson-player__range-marker--start::after {
  right: 4px;
  left: auto;
}

.lesson-player__route-entry.is-range-single .lesson-player__range-marker--end::after {
  right: auto;
  left: 4px;
}

.lesson-player__range-marker--start::after {
  left: 6px;
}

.lesson-player__range-marker--end::after {
  right: 6px;
}

.lesson-player__action-row {
  display: flex;
  align-items: center;
 
  gap: 10px;
}

.lesson-player__mode-control,
.lesson-player__tempo-control,
.lesson-player__count-in-control {
  display: flex;
  align-items: center;
  justify-items: initial;
  gap: 5px;
}

.lesson-player__mode-switch {
  display: grid;
  grid-auto-columns: auto;
  grid-template-columns: repeat(2, var(--lesson-control-size));
  border-radius: 8px;
}

.lesson-player__mode-switch button,
.lesson-player__stepper button {
  width: var(--lesson-control-size);
  min-width: var(--lesson-control-size);
  height: var(--lesson-control-size);
  min-height: var(--lesson-control-size);
  padding: 0;
  font-size: 0.72rem;
}

.lesson-player__mode-switch--scope {
  grid-template-columns: max-content max-content;
  gap: 2px;
}

.lesson-player__mode-switch--scope button {
  width: auto;
  min-width: 0;
  padding: 0 8px;
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.lesson-player__mode-switch button svg,
.lesson-player__transport-button svg,
.lesson-player__play-button svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.lesson-player__play-button svg {
  width: var(--lesson-control-icon-size);
  height: var(--lesson-control-icon-size);
  fill: currentColor;
  stroke: none;
}

.lesson-player__play-button [data-lesson-player-play-shape][hidden],
.lesson-player__play-button [data-lesson-player-stop-shape][hidden] {
  display: none !important;
}

.lesson-player__transport {
  display: flex;
  align-items: center;
  gap: 4px;
}

.lesson-player__transport-button,
.lesson-player__play-button {
  display: grid;
  width: var(--lesson-control-size);
  min-width: var(--lesson-control-size);
  height: var(--lesson-control-size);
  min-height: var(--lesson-control-size);
  place-items: center;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: color-mix(in srgb, var(--surface-strong) 92%, #000 8%);
  color: var(--text);
  box-shadow: none;
}

.lesson-player__play-button {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-text);
}

.lesson-player__play-button.is-playing,
.lesson-player__play-button.is-loading {
    background: #101114;
    color: #ffffff;
}

.lesson-player__loop-toggle {
  position: relative;
}

.lesson-player__loop-toggle.is-active {
  border-color: var(--accent);
  background: var(--accent) !important;
  color: var(--accent-text) !important;
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 28%, transparent);
}

.lesson-player__loop-toggle.is-active svg {
  stroke-width: 2.6;
}

.lesson-player__transport-button:hover:not(:disabled),
.lesson-player__transport-button.is-active {
  color: var(--accent-strong);
}

.lesson-player__session-settings {
  grid-template-columns: max-content max-content;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  padding-top: 8px;
}

.lesson-player__tempo-control .lesson-player__control-label {
  grid-column: auto;
}

.lesson-player__tempo-control .lesson-player__stepper,
.lesson-player__stepper {
  grid-template-columns: var(--lesson-control-size) 48px var(--lesson-control-size);
  border-radius: 8px;
}

.lesson-player__stepper output {
  font-size: 0.78rem;
}

.lesson-player__unit {
  font-size: 0.62rem;
}

.lesson-player__count-in-control {
  justify-items: initial;
}

.lesson-player__count-in-control .lesson-player__mode-switch {
  grid-template-columns: repeat(3, var(--lesson-control-size));
}

@media (max-width: 360px) {
  .lesson-player__session-settings {
    grid-template-columns: max-content;
    justify-content: start;
    gap: 5px;
  }
}

/* The lesson player must stay inside a phone viewport.  The controls above
   are intentionally compact on desktop, so give narrow screens an explicit
   single-column settings row instead of letting its intrinsic width escape. */
@media (max-width: 520px) {
  html,
  body {
    min-width: 0;
    overflow-x: clip;
  }

  .lesson-player,
  .lesson-player__notation,
  .lesson-player__board,
  .lesson-player__lab,
  .lesson-player__track-row,
  .lesson-player__track-wrap {
    width: 100%;
    min-width: 0;
    max-width: 100%;
  }

  .lesson-player {
    overflow: hidden;
  }

  .lesson-player__notation,
  .lesson-player__board {
    overflow: hidden;
  }

  .lesson-player__notation svg,
  .lesson-player__board .fretboard {
    width: 100%;
    max-width: 100%;
  }

  .lesson-player__route,
  .lesson-player__action-row,
  .lesson-player__transport {
    min-width: 0;
    max-width: 100%;
  }

  .lesson-player__session-settings {
    grid-template-columns: max-content max-content;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
  }

  .lesson-player__tempo-control {
    justify-content: flex-start;
  }

  .lesson-player__count-in-control {
    justify-content: flex-end;
  }
}

@media (max-width: 380px) {
  .lesson-player__session-settings {
    grid-template-columns: minmax(0, 1fr);
    gap: 5px;
  }

  .lesson-player__count-in-control {
    justify-content: flex-start;
  }
}

.lesson-player { --lesson-control-size: 24px; --lesson-control-icon-size: 14px; gap: 6px; margin-block: 4px; padding: 8px; }
.lesson-player__lab { gap: 6px; padding: 8px; }
.lesson-player__action-row { align-items: end; gap: 4px; flex-wrap: nowrap; }
.lesson-player__mode-control,
.lesson-player__duration-control,
.lesson-player__start-rest-control,
.lesson-player__tempo-control,
.lesson-player__count-in-control,
.lesson-player__transport {
  display: grid;
  grid-template-columns: max-content;
  grid-template-rows: 10px var(--lesson-control-size);
  align-items: end;
  justify-items: start;
  flex: 0 0 auto;
  gap: 3px;
}
.lesson-player__control-label {
  display: block;
  min-height: 10px;
  color: var(--muted);
  font-size: 0.5rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.02em;
  justify-self: start;
  text-align: left;
  text-transform: uppercase;
  white-space: nowrap;
}
.lesson-player__duration-control .lesson-player__mode-switch { grid-template-columns: repeat(3, var(--lesson-control-size)); }
.lesson-player__start-rest-control .lesson-player__mode-switch { grid-template-columns: repeat(3, var(--lesson-control-size)); }
.lesson-player__duration-control .lesson-player__mode-switch button { font-size: 0.6rem; }
.lesson-player__start-rest-control .lesson-player__mode-switch button { font-size: 0.6rem; }
.lesson-player__mode-switch--scope button { padding-inline: 6px; }
.lesson-player__tempo-control { grid-template-columns: max-content; }
.lesson-player__tempo-control .lesson-player__stepper { grid-template-columns: var(--lesson-control-size) 36px var(--lesson-control-size); }
.lesson-player__transport { grid-template-columns: var(--lesson-control-size); }
.lesson-player__stepper output { font-size: 0.68rem; }
.lesson-player__count-in-toggle {
  display: grid;
  width: var(--lesson-control-size);
  min-width: var(--lesson-control-size);
  height: var(--lesson-control-size);
  min-height: var(--lesson-control-size);
  place-items: center;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: color-mix(in srgb, var(--surface-strong) 92%, #000 8%);
  color: var(--muted);
}
.lesson-player__count-in-toggle svg { width: 14px; height: 14px; fill: none; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; stroke-width: 2.6; }
.lesson-player__count-in-toggle.is-active { border-color: var(--accent); background: var(--accent); color: var(--accent-text); }
.lesson-player__play-row { display: flex; padding-top: 6px; border-top: 1px solid var(--border); }
.lesson-player__play-row .lesson-player__play-button { display: inline-flex; width: 100%; height: 34px; min-height: 34px; align-items: center; justify-content: center; gap: 7px; font-size: 0.72rem; font-weight: 800; }

@media (max-width: 520px) {
  .lesson-player__action-row {
    display: grid;
    grid-template-columns: repeat(3, max-content);
    justify-content: center;
    gap: 6px 4px;
  }
}

@media (max-width: 350px) {
  .lesson-player { --lesson-control-size: 20px; }
  .lesson-player__action-row { gap: 2px; }
  .lesson-player__control-label { font-size: 0.44rem; letter-spacing: 0; }
  .lesson-player__tempo-control .lesson-player__stepper { grid-template-columns: 20px 28px 20px; }
  .lesson-player__mode-switch--scope button { padding-inline: 4px; font-size: 0.55rem; }
  .lesson-player__duration-control .lesson-player__mode-switch button { font-size: 0.54rem; }
}

@media print {
  @page {
    size: A4 portrait;
    margin: 12mm;
  }

  :root {
    color-scheme: light;
    --background: #ffffff;
    --surface: #ffffff;
    --surface-strong: #ffffff;
    --text: #17191d;
    --muted: #5e6570;
    --border: #b8bec7;
    --accent: #d08a25;
    --accent-strong: #8b5307;
    --accent-text: #ffffff;
    --note: #287797;
    --note-fill: #e7f3f8;
    --shadow: none;
  }

  * {
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  html,
  body {
    min-width: 0;
    background: #ffffff;
  }

  .app-shell {
    width: 100%;
    padding: 0;
  }

  .app-header {
    margin-bottom: 4mm;
  }

  .brand__icon {
    width: 10mm;
    height: 10mm;
    box-shadow: none;
  }

  h1 {
    font-size: 20pt;
  }

  .brand__feature,
  .brand__lite-note {
    margin-top: 1mm;
    font-size: 9pt;
  }

  .toolbar,
  .instrument-card,
  .practice,
  .pattern-controls,
  .pattern-order,
  .lesson-player,
  .install-guide,
  .app-footer,
  .button--quiet,
  .button--export,
  .noscript {
    display: none !important;
  }

  .legend {
    margin: 0 0 2mm;
    padding: 0;
    font-size: 9pt;
  }

  .print-metadata[hidden] {
    display: block;
    margin: 0 0 4mm;
    color: var(--muted);
    font-size: 8.5pt;
  }

  .patterns {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 5mm;
  }

  .pattern,
  .pattern:last-child:nth-child(odd) {
    width: auto;
    padding: 3.5mm;
    border-radius: 3mm;
    break-inside: avoid;
    page-break-inside: avoid;
    grid-column: auto;
    justify-self: stretch;
  }

  .pattern:last-child:nth-child(odd) {
    grid-column: 1 / -1;
    width: calc(50% - 2.5mm);
    justify-self: center;
  }

  .pattern__header {
    gap: 3mm;
    margin-bottom: 1mm;
  }

  .pattern__title {
    font-size: 11pt;
  }

  .pattern__range {
    font-size: 8.5pt;
  }

  .pattern__play {
    display: none !important;
  }

  .fretboard {
    break-inside: avoid;
    page-break-inside: avoid;
  }

  .fretboard__note.is-playing {
    animation: none;
  }
}

/* A long exercise can have dozens of route fragments. Keep the player usable
   on a phone: the card itself may scroll, while the route gets its own short
   swipe area so transport controls stay close to it. */
@media (max-width: 680px), (max-height: 760px) {
  .lesson-player {
    max-height: calc(100dvh - 16px);
    overflow-x: hidden;
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: color-mix(in srgb, var(--accent) 48%, var(--border)) transparent;
    touch-action: pan-y;
  }

  .lesson-player__track-wrap {
    max-height: min(172px, 25dvh);
    overflow-x: hidden;
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: color-mix(in srgb, var(--accent) 48%, var(--border)) transparent;
    touch-action: pan-y;
  }
}


/* Exercise library: selection stays in the drawer, Play opens a focused lesson sheet. */
.exercise-card {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 8px;
  padding: 7px 8px;
  cursor: default;
}

.exercise-card__play,
.exercise-card__select {
  min-width: 0;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  text-align: left;
}

.exercise-card__play {
  display: grid;
  width: 32px;
  height: 32px;
  padding: 0;
  place-items: center;
  align-self: center;
  border-radius: 9px;
  background: color-mix(in srgb, var(--accent) 15%, var(--surface));
  color: var(--accent-strong);
  cursor: pointer;
}

.exercise-card__play svg {
  width: 17px;
  height: 17px;
  fill: currentColor;
  stroke: none;
}

.exercise-card__play:hover:not(:disabled),
.exercise-card__play:focus-visible {
  background: var(--accent);
  color: var(--accent-text);
}

.exercise-card__select {
  display: grid;
  align-self: stretch;
  padding: 0;
  cursor: pointer;
}

.exercise-card__select:focus-visible,
.exercise-card__play:focus-visible,
.lesson-player__close:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.exercise-card.is-active .exercise-card__play {
  background: color-mix(in srgb, var(--accent) 38%, var(--surface));
  color: var(--accent-strong);
}

.lesson-modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: max(12px, env(safe-area-inset-top)) max(12px, env(safe-area-inset-right)) max(12px, env(safe-area-inset-bottom)) max(12px, env(safe-area-inset-left));
  background: rgb(5 6 8 / 70%);
  backdrop-filter: blur(8px);
}

.lesson-modal[hidden] {
  display: none;
}

body.has-lesson-modal {
  overflow: hidden;
}

.lesson-modal .lesson-player {
  position: relative;
  top: auto;
  z-index: auto;
  width: min(100%, 760px);
  max-height: calc(100dvh - 24px);
  margin: 0;
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-gutter: stable;
  scrollbar-color: color-mix(in srgb, var(--accent) 48%, var(--border)) transparent;
}

.lesson-player__header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
}

.lesson-player__header > :first-child { min-width: 0; }
.lesson-player__heading-line { display: flex; align-items: center; gap: 10px; min-width: 0; }
.lesson-player__heading-line h3 { flex: 0 1 auto; min-width: 0; margin: 0; }
.lesson-player__header h3, .lesson-player__note { overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.lesson-player__note { min-height: 1.2em; }
.lesson-player__progress { width: calc(9ch + 16px); text-align: center; white-space: nowrap; font-variant-numeric: tabular-nums; }

.lesson-player__header-actions {
  display: flex;
  grid-column: 1 / -1;
  min-width: 0;
  max-width: 100%;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: center;
  gap: 6px;
}

.lesson-player__header-actions:empty { display: none; }
.lesson-player__header > .lesson-player__close { align-self: start; width: 32px; min-width: 32px; height: 32px; min-height: 32px; }

.lesson-player__close {
  display: grid;
  width: var(--lesson-control-size);
  min-width: var(--lesson-control-size);
  height: var(--lesson-control-size);
  min-height: var(--lesson-control-size);
  padding: 0;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: color-mix(in srgb, var(--surface-strong) 92%, #000 8%);
  color: var(--muted);
  cursor: pointer;
}

.lesson-player__close:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
}

.lesson-player__close svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-width: 2;
}

@media (max-width: 520px) {
  .lesson-modal {
    align-items: stretch;
    padding: 8px;
  }

  .lesson-modal .lesson-player {
    align-self: start;
    width: 100%;
    max-height: calc(100dvh - 16px);
  }
}