@charset "UTF-8";

:root {
  --bg: #0c0d10;
  --sidebar: #111216;
  --surface: #15171b;
  --surface-2: #1b1d22;
  --surface-3: #22252b;
  --ink: #f3eee7;
  --muted: #9b9992;
  --faint: #6c6d69;
  --line: rgba(243, 238, 231, 0.12);
  --line-strong: rgba(243, 238, 231, 0.21);
  --mint: #9ad8bc;
  --mint-deep: #5f9f84;
  --amber: #efb46c;
  --amber-soft: #8e6741;
  --red: #ee7b75;
  --serif: "Iowan Old Style", "Hiragino Mincho ProN", "Yu Mincho", Georgia, serif;
  --sans: "Avenir Next", "Hiragino Sans", "Yu Gothic", "Noto Sans JP", system-ui, sans-serif;
  --mono: "SFMono-Regular", "Roboto Mono", "Noto Sans Mono", monospace;
  --radius: 5px;
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.24);
}

* { box-sizing: border-box; }
html { background: var(--bg); scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    radial-gradient(circle at 77% -10%, rgba(154, 216, 188, 0.07), transparent 27rem),
    radial-gradient(circle at 16% 90%, rgba(239, 180, 108, 0.04), transparent 22rem),
    var(--bg);
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
button, input, select { font: inherit; }
button { color: inherit; }
button, select { cursor: pointer; }
button:focus-visible, input:focus-visible, select:focus-visible, [tabindex]:focus-visible { outline: 2px solid var(--mint); outline-offset: 3px; }

.app-shell { display: flex; min-height: 100vh; }
.sidebar {
  position: sticky;
  top: 0;
  display: flex;
  flex: 0 0 248px;
  flex-direction: column;
  min-height: 100vh;
  padding: 29px 21px 20px;
  border-right: 1px solid var(--line);
  background: var(--sidebar);
}
.brand-lockup { display: flex; align-items: center; gap: 11px; }
.brand-mark { position: relative; display: grid; place-items: center; width: 38px; height: 38px; border: 1px solid var(--amber); color: var(--amber); font-family: var(--serif); font-size: 17px; line-height: 1; letter-spacing: -0.12em; }
.brand-mark span:first-child { transform: translateX(-3px); }
.brand-mark span:last-child { transform: translateX(3px); }
.brand-mark i { position: absolute; width: 1px; height: 31px; background: var(--amber); transform: rotate(30deg); }
.brand-kicker, .eyebrow, .nav-label, .field-label, .small-status, .panel-index, .sidebar-foot, .topbar-meta, .diagram-caption, .diagram-fret-label, .inspector-footer, .result-rule, .lesson-meta, .tuning-card-head, .quick-presets, .finder-actions, .progression-note, .practice-quote, .quiz-score, .quiz-hint { font-family: var(--mono); letter-spacing: 0.1em; text-transform: uppercase; }
.brand-kicker { margin: 0 0 2px; color: var(--amber); font-size: 9px; }
.brand-lockup h1 { margin: 0; color: var(--ink); font-family: var(--serif); font-size: 18px; font-weight: 600; letter-spacing: -0.02em; }
.brand-note { margin: 27px 0 36px 2px; color: var(--muted); font-size: 12px; line-height: 1.85; }
.nav-label { margin: 0 0 10px; color: var(--faint); font-size: 9px; }
.nav-label-spaced { margin-top: 31px; }
.primary-nav { display: flex; flex-direction: column; }
.nav-link { display: grid; grid-template-columns: 29px 1fr auto; align-items: center; min-height: 42px; padding: 0 8px; border: 1px solid transparent; border-radius: var(--radius); color: var(--muted); background: transparent; text-align: left; transition: 160ms ease; }
.nav-link:hover { color: var(--ink); background: rgba(255,255,255,0.035); }
.nav-link.is-active { border-color: rgba(154, 216, 188, 0.25); color: var(--ink); background: rgba(154, 216, 188, 0.075); }
.nav-index { color: var(--faint); font-family: var(--mono); font-size: 10px; }
.nav-link.is-active .nav-index { color: var(--mint); }
kbd { padding: 2px 5px; border: 1px solid var(--line); border-radius: 3px; color: var(--faint); font-family: var(--mono); font-size: 9px; line-height: 1.2; }
.nav-link.is-active kbd { border-color: rgba(154,216,188,0.25); color: var(--mint); }
.sidebar-bottom { margin-top: auto; }
.tuning-card { padding: 15px 14px 13px; border: 1px solid var(--line); background: rgba(255,255,255,0.02); }
.tuning-card-head { display: flex; justify-content: space-between; color: var(--faint); font-size: 8px; }
.status-pip, .live-dot { display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 0 3px rgba(154, 216, 188, 0.09); }
.tuning-card strong { display: block; margin: 12px 0 4px; color: var(--mint); font-family: var(--mono); font-size: 15px; font-weight: 500; letter-spacing: 0.04em; }
.tuning-card small { color: var(--faint); font-size: 10px; }
.sidebar-foot { display: flex; justify-content: space-between; margin-top: 16px; color: var(--faint); font-size: 8px; }

.main-shell { min-width: 0; flex: 1; }
.topbar { display: flex; align-items: center; justify-content: space-between; min-height: 74px; padding: 0 clamp(22px, 4vw, 65px); border-bottom: 1px solid var(--line); }
.mobile-brand { display: none; align-items: center; gap: 8px; }
.mobile-brand strong { font-family: var(--serif); font-size: 17px; }
.mobile-brand-mark { display: grid; place-items: center; width: 30px; height: 30px; border: 1px solid var(--amber); color: var(--amber); font-family: var(--mono); font-size: 10px; }
.global-search { display: flex; align-items: center; width: min(360px, 48%); gap: 8px; border-bottom: 1px solid var(--line-strong); color: var(--faint); }
.search-icon { color: var(--amber); font-size: 22px; line-height: 1; transform: translateY(-2px); }
.global-search input { width: 100%; padding: 10px 0 9px; border: 0; outline: none; color: var(--ink); background: transparent; font-size: 12px; }
.global-search input::placeholder { color: var(--faint); }
.global-search kbd { border: 0; padding: 0; font-size: 8px; }
.topbar-meta { display: flex; align-items: center; gap: 9px; color: var(--faint); font-size: 8px; }
.topbar-divider { width: 1px; height: 12px; background: var(--line-strong); }

.content-wrap { width: min(1400px, 100%); margin: 0 auto; padding: 42px clamp(22px, 4vw, 65px) 70px; }
.view-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin-bottom: 30px; }
.eyebrow { margin: 0 0 9px; color: var(--amber); font-size: 9px; }
.view-heading h2 { margin: 0; font-family: var(--serif); font-size: clamp(31px, 4vw, 47px); font-weight: 400; letter-spacing: -0.045em; line-height: 1.05; }
.view-heading > p { max-width: 250px; margin: 0 0 3px; color: var(--muted); font-size: 12px; line-height: 1.7; }
.view { display: none; animation: enter 240ms ease both; }
.view.is-active { display: block; }
@keyframes enter { from { opacity: 0; transform: translateY(7px); } to { opacity: 1; transform: none; } }

.panel { border: 1px solid var(--line); background: linear-gradient(125deg, rgba(255,255,255,0.028), rgba(255,255,255,0.012)); box-shadow: var(--shadow); }
.explore-grid { display: grid; grid-template-columns: minmax(250px, 0.72fr) minmax(0, 1.6fr); gap: 14px; }
.control-panel { padding: 24px 21px 20px; }
.panel-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 15px; margin-bottom: 24px; }
.compact-heading { margin-bottom: 28px; }
.panel-heading h3, .builder-head h3, .quiz-top h3 { margin: 4px 0 0; font-family: var(--serif); font-size: 22px; font-weight: 400; letter-spacing: -0.035em; }
.panel-index { display: block; color: var(--amber); font-size: 8px; }
.small-status, .result-rule { color: var(--faint); font-size: 8px; white-space: nowrap; }
.field-label { display: flex; justify-content: space-between; margin-bottom: 8px; color: var(--muted); font-size: 9px; }
.field-label span { color: var(--faint); font-size: 8px; }
.root-select-wrap { position: relative; margin-bottom: 25px; }
.root-select-wrap select, .key-picker select, .slot-select { appearance: none; width: 100%; border: 1px solid var(--line-strong); border-radius: var(--radius); color: var(--ink); background-color: var(--surface-2); outline: none; }
.root-select-wrap select { padding: 13px 38px 13px 14px; font-family: var(--mono); font-size: 17px; }
.root-select-wrap select:hover, .key-picker select:hover, .slot-select:hover { border-color: var(--mint-deep); }
.select-arrow { position: absolute; top: 12px; right: 13px; color: var(--mint); pointer-events: none; }
.quality-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.quality-header .field-label { margin: 0; }
.quality-count { color: var(--faint); font-family: var(--mono); font-size: 8px; }
.quality-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 5px; }
.quality-button { display: flex; align-items: center; min-height: 52px; gap: 8px; padding: 8px 7px; border: 1px solid transparent; border-radius: var(--radius); color: var(--muted); background: rgba(255,255,255,0.025); text-align: left; transition: 160ms ease; }
.quality-button:hover { color: var(--ink); background: rgba(255,255,255,0.065); }
.quality-button.is-active { border-color: rgba(154,216,188,0.4); color: var(--ink); background: rgba(154,216,188,0.1); }
.quality-symbol { display: grid; place-items: center; width: 27px; height: 27px; border: 1px solid currentColor; color: var(--mint); font-family: var(--mono); font-size: 10px; }
.quality-copy { min-width: 0; }
.quality-copy strong, .quality-copy small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.quality-copy strong { font-size: 11px; font-weight: 500; }
.quality-copy small { margin-top: 2px; color: var(--faint); font-family: var(--mono); font-size: 8px; }
.panel-rule { height: 1px; margin: 25px 0 18px; background: var(--line); }
.control-footnote, .progression-note { display: flex; gap: 9px; color: var(--muted); }
.footnote-mark { flex: 0 0 auto; display: grid; place-items: center; width: 16px; height: 16px; border: 1px solid var(--amber-soft); color: var(--amber); font-family: var(--mono); font-size: 9px; }
.control-footnote p, .progression-note p { margin: 0; font-size: 10px; line-height: 1.65; }

.inspector-panel { overflow: hidden; }
.inspector-topline, .inspector-footer { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 22px 25px 0; color: var(--faint); font-size: 8px; }
.inspector-topline .panel-index { color: var(--amber); }
.chord-heading-row { display: flex; align-items: flex-end; justify-content: space-between; gap: 15px; padding: 7px 25px 20px; border-bottom: 1px solid var(--line); }
.chord-eyebrow { margin: 0 0 1px; color: var(--mint); font-family: var(--mono); font-size: 9px; letter-spacing: 0.08em; text-transform: uppercase; }
.chord-heading-row h3 { margin: 0; color: var(--ink); font-family: var(--serif); font-size: clamp(60px, 8vw, 106px); font-weight: 400; letter-spacing: -0.075em; line-height: 0.9; }
.chord-heading-row { flex-wrap: wrap; }
.audio-source-status { flex-basis: 100%; order: 3; margin: -10px 0 0; color: var(--faint); font-family: var(--mono); font-size: 8px; letter-spacing: 0.04em; }
.audio-source-status.is-ready { color: var(--mint); }
.chord-actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 7px; padding-bottom: 1px; }
.icon-button, .ghost-button, .primary-button, .tiny-preset { border-radius: var(--radius); transition: 160ms ease; }
.icon-button, .ghost-button { min-height: 34px; padding: 0 11px; border: 1px solid var(--line-strong); color: var(--muted); background: transparent; font-size: 10px; }
.icon-button:hover, .ghost-button:hover { border-color: var(--mint-deep); color: var(--ink); background: rgba(154,216,188,0.07); }
.icon-button.is-playing { border-color: var(--amber); color: var(--amber); }
.play-triangle { margin-right: 4px; color: var(--amber); font-size: 9px; }
.inspector-content { display: grid; grid-template-columns: minmax(260px, 0.9fr) minmax(250px, 1.05fr); min-height: 390px; }
.diagram-column { display: flex; align-items: center; justify-content: center; min-height: 390px; border-right: 1px solid var(--line); background: rgba(0,0,0,0.09); }
.diagram-wrap { width: min(100%, 345px); padding: 8px 13px 0; }
.diagram-head { display: flex; justify-content: space-between; align-items: center; margin: 0 4px 1px; }
.diagram-caption, .diagram-fret-label { color: var(--faint); font-size: 8px; }
.diagram-fret-label { color: var(--mint); }
.chord-diagram { display: block; width: 100%; height: auto; overflow: visible; }
.diagram-direction, .diagram-string-label { fill: var(--faint); font-family: var(--mono); font-size: 8px; letter-spacing: 0.05em; }
.diagram-string-label { font-size: 7px; text-anchor: middle; }
.diagram-string { stroke: rgba(243,238,231,0.28); stroke-width: 1; }
.diagram-fret { stroke: rgba(243,238,231,0.18); stroke-width: 1; }
.diagram-nut { stroke: var(--amber); stroke-width: 3; }
.diagram-dot circle { fill: var(--mint); stroke: rgba(154,216,188,0.28); stroke-width: 5; }
.diagram-dot text { fill: #101615; font-family: var(--mono); font-size: 9px; font-weight: 700; text-anchor: middle; }
.diagram-marker { font-family: var(--serif); font-size: 18px; text-anchor: middle; }
.diagram-marker.muted { fill: var(--red); }
.diagram-marker.open { fill: var(--amber); font-size: 19px; }
.diagram-legend { display: flex; justify-content: center; gap: 14px; color: var(--faint); font-family: var(--mono); font-size: 8px; }
.legend-dot, .legend-line { display: inline-block; vertical-align: middle; margin-right: 4px; }
.legend-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--mint); }
.legend-line { width: 10px; height: 1px; background: var(--amber); }
.chord-explanation { display: flex; flex-direction: column; gap: 22px; padding: 27px 25px 22px; }
.formula-block { padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.formula-block strong { display: block; margin: 8px 0 6px; color: var(--amber); font-family: var(--mono); font-size: 24px; font-weight: 400; letter-spacing: 0.08em; }
.formula-block p, .insight-block p { margin: 0; color: var(--muted); font-size: 11px; line-height: 1.7; }
.note-block .field-label { margin-bottom: 9px; }
.note-cards { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 5px; }
.note-card { min-width: 0; padding: 9px 7px 8px; border: 1px solid var(--line); background: rgba(255,255,255,0.025); }
.note-card.is-root { border-color: rgba(239,180,108,0.5); background: rgba(239,180,108,0.06); }
.note-card-index, .note-card strong, .note-card small { display: block; }
.note-card-index { margin-bottom: 7px; color: var(--mint); font-family: var(--mono); font-size: 8px; }
.note-card strong { color: var(--ink); font-family: var(--serif); font-size: 21px; font-weight: 400; line-height: 1; }
.note-card small { overflow: hidden; margin-top: 7px; color: var(--faint); font-size: 8px; text-overflow: ellipsis; white-space: nowrap; }
.insight-block { margin-top: auto; padding: 11px 12px; border-left: 1px solid var(--amber); background: rgba(239,180,108,0.05); }
.insight-label { display: block; margin-bottom: 6px; color: var(--amber); font-family: var(--mono); font-size: 8px; letter-spacing: 0.1em; }
.inspector-footer { padding: 11px 25px 13px; border-top: 1px solid var(--line); font-size: 8px; }
.inspector-footer span:last-child { color: var(--mint); }

.explore-lower { display: grid; grid-template-columns: minmax(250px, 1fr) minmax(360px, 1.1fr); gap: 14px; margin-top: 14px; padding: 22px 25px; border: 1px solid var(--line); background: rgba(255,255,255,0.012); }
.lower-intro h3 { margin: 0 0 5px; font-family: var(--serif); font-size: 21px; font-weight: 400; }
.lower-intro p { max-width: 470px; margin: 0; color: var(--muted); font-size: 11px; }
.micro-guide { display: grid; grid-template-columns: repeat(3, 1fr); align-self: center; gap: 9px; }
.micro-guide > div { padding: 12px; border-top: 1px solid var(--line-strong); }
.micro-guide span, .micro-guide strong, .micro-guide small { display: block; }
.micro-guide span { margin-bottom: 16px; color: var(--amber); font-family: var(--mono); font-size: 9px; }
.micro-guide strong { font-family: var(--mono); font-size: 12px; font-weight: 500; }
.micro-guide small { margin-top: 4px; color: var(--faint); font-size: 9px; }

/* Reverse finder */
.reverse-grid { display: grid; grid-template-columns: minmax(290px, 0.78fr) minmax(0, 1.22fr); gap: 14px; }
.finder-panel, .results-panel, .preset-panel, .builder-panel, .quiz-panel, .practice-side { padding: 24px; }
.panel-lead { margin: -12px 0 24px; color: var(--muted); font-size: 11px; line-height: 1.7; }
.finder-notes { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 5px; }
.note-toggle { min-height: 58px; padding: 8px 4px; border: 1px solid var(--line); border-radius: var(--radius); color: var(--muted); background: rgba(255,255,255,0.02); transition: 160ms ease; }
.note-toggle:hover { color: var(--ink); background: rgba(255,255,255,0.06); }
.note-toggle.is-selected { border-color: var(--mint); color: #111a16; background: var(--mint); }
.note-toggle span, .note-toggle small { display: block; }
.note-toggle span { font-family: var(--serif); font-size: 18px; line-height: 1; }
.note-toggle small { min-height: 12px; margin-top: 6px; font-family: var(--mono); font-size: 7px; }
.finder-actions { display: flex; align-items: center; justify-content: space-between; margin-top: 17px; color: var(--faint); font-size: 8px; }
.finder-actions .ghost-button { min-height: 29px; font-size: 9px; }
.quick-presets { display: block; margin-top: 29px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--faint); font-size: 8px; }
.quick-presets > div { display: flex; gap: 5px; margin-top: 9px; }
.tiny-preset { min-width: 48px; min-height: 31px; border: 1px solid var(--line-strong); color: var(--mint); background: transparent; font-family: var(--mono); font-size: 10px; }
.tiny-preset:hover { border-color: var(--mint); background: rgba(154,216,188,0.08); }
.finder-results { min-height: 260px; }
.candidate-card { display: grid; grid-template-columns: 27px 1fr auto; align-items: center; width: 100%; gap: 10px; padding: 13px 11px; border: 1px solid transparent; border-bottom-color: var(--line); color: var(--muted); background: transparent; text-align: left; transition: 160ms ease; }
.candidate-card:hover { border-color: var(--line-strong); color: var(--ink); background: rgba(255,255,255,0.035); }
.candidate-card.is-exact { border-left: 2px solid var(--mint); color: var(--ink); background: rgba(154,216,188,0.055); }
.candidate-rank { color: var(--faint); font-family: var(--mono); font-size: 9px; }
.candidate-main strong, .candidate-main small { display: block; }
.candidate-main strong { font-family: var(--serif); font-size: 20px; font-weight: 400; }
.candidate-main small { margin-top: 2px; color: var(--faint); font-family: var(--mono); font-size: 8px; }
.candidate-score { color: var(--mint); font-family: var(--mono); font-size: 9px; }
.empty-state { display: grid; place-items: center; min-height: 260px; padding: 30px; border: 1px dashed var(--line-strong); text-align: center; }
.empty-state .empty-kicker { color: var(--amber); font-family: var(--mono); font-size: 8px; letter-spacing: 0.12em; }
.empty-state strong { margin-top: 10px; font-family: var(--serif); font-size: 22px; font-weight: 400; }
.empty-state p { max-width: 240px; margin: 5px 0 0; color: var(--muted); font-size: 11px; }

/* Progression builder */
.progression-layout { display: grid; grid-template-columns: minmax(250px, 0.7fr) minmax(0, 1.5fr); gap: 14px; }
.preset-list { display: flex; flex-direction: column; gap: 6px; }
.preset-card { display: grid; grid-template-columns: 31px 1fr; align-items: center; gap: 8px; min-height: 62px; padding: 9px 10px; border: 1px solid transparent; border-bottom-color: var(--line); color: var(--muted); background: transparent; text-align: left; }
.preset-card:hover { color: var(--ink); background: rgba(255,255,255,0.035); }
.preset-card.is-active { border-color: rgba(154,216,188,0.3); color: var(--ink); background: rgba(154,216,188,0.07); }
.preset-number { color: var(--amber); font-family: var(--mono); font-size: 10px; }
.preset-card strong, .preset-card small { display: block; }
.preset-card strong { font-family: var(--serif); font-size: 16px; font-weight: 400; }
.preset-card small { margin-top: 2px; color: var(--faint); font-family: var(--mono); font-size: 8px; }
.progression-note { margin-top: 25px; padding-top: 17px; border-top: 1px solid var(--line); }
.builder-panel { padding-bottom: 18px; }
.builder-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 15px; margin-bottom: 25px; }
.key-picker { display: flex; align-items: center; gap: 9px; color: var(--amber); font-family: var(--mono); font-size: 8px; }
.key-picker select { width: 126px; padding: 9px 30px 9px 11px; background-image: linear-gradient(45deg, transparent 50%, var(--mint) 50%), linear-gradient(135deg, var(--mint) 50%, transparent 50%); background-position: calc(100% - 14px) 14px, calc(100% - 10px) 14px; background-size: 4px 4px, 4px 4px; background-repeat: no-repeat; font-family: var(--mono); font-size: 11px; }
.slot-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 6px; }
.slot-card { min-width: 0; padding: 14px 10px 12px; border: 1px solid var(--line); background: rgba(255,255,255,0.025); }
.slot-index { display: flex; align-items: center; justify-content: space-between; margin-bottom: 15px; }
.slot-index span { color: var(--amber); font-family: var(--serif); font-size: 23px; }
.slot-index small { color: var(--faint); font-family: var(--mono); font-size: 7px; }
.slot-select { margin-top: 5px; padding: 8px 24px 8px 7px; background-image: linear-gradient(45deg, transparent 50%, var(--faint) 50%), linear-gradient(135deg, var(--faint) 50%, transparent 50%); background-position: calc(100% - 10px) 13px, calc(100% - 6px) 13px; background-size: 4px 4px, 4px 4px; background-repeat: no-repeat; font-size: 10px; }
.slot-name { display: block; margin-top: 13px; color: var(--mint); font-family: var(--mono); font-size: 15px; font-weight: 400; }
.progression-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 5px; margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--line); }
.strip-chord { padding: 11px 8px; border: 1px solid transparent; border-top-color: var(--amber-soft); background: rgba(239,180,108,0.04); text-align: left; }
.strip-chord:hover { border-color: var(--amber); }
.strip-chord span, .strip-chord strong { display: block; }
.strip-chord span { color: var(--faint); font-family: var(--mono); font-size: 8px; }
.strip-chord strong { margin-top: 4px; color: var(--ink); font-family: var(--serif); font-size: 19px; font-weight: 400; }
.builder-footer { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin-top: 19px; }
.builder-footer p { max-width: 300px; margin: 6px 0 0; color: var(--muted); font-size: 10px; }
.primary-button { min-height: 38px; padding: 0 15px; border: 1px solid var(--mint); color: #101715; background: var(--mint); font-family: var(--mono); font-size: 10px; }
.primary-button:hover { border-color: var(--ink); background: var(--ink); }
.primary-button:disabled { cursor: wait; opacity: 0.65; }
.primary-button.is-playing { border-color: var(--amber); background: var(--amber); }

/* Learn */
.learn-intro { display: flex; align-items: flex-end; justify-content: space-between; gap: 35px; padding: 24px; margin-bottom: 14px; }
.learn-intro h3 { margin: 5px 0 0; font-family: var(--serif); font-size: 25px; font-weight: 400; }
.learn-intro p { max-width: 340px; margin: 0; color: var(--muted); font-size: 11px; }
.lesson-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.lesson-card { min-height: 250px; padding: 20px 18px; border: 1px solid var(--line); background: var(--surface); transition: transform 180ms ease, border-color 180ms ease; }
.lesson-card:hover { border-color: var(--line-strong); transform: translateY(-3px); }
.lesson-meta { display: flex; align-items: center; justify-content: space-between; padding-bottom: 15px; border-bottom: 1px solid var(--line); color: var(--amber); font-size: 8px; }
.lesson-meta em { color: var(--faint); font-style: normal; }
.lesson-card h3 { margin: 25px 0 9px; font-family: var(--serif); font-size: 21px; font-weight: 400; line-height: 1.2; }
.lesson-card p { min-height: 83px; margin: 0; color: var(--muted); font-size: 11px; line-height: 1.72; }
.lesson-chips { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 17px; }
.lesson-chips span { padding: 4px 6px; border: 1px solid var(--line); color: var(--mint); font-family: var(--mono); font-size: 8px; }
.learn-band { display: grid; grid-template-columns: 1.25fr 1fr; align-items: center; gap: 30px; margin-top: 14px; padding: 28px 25px; border: 1px solid var(--amber-soft); background: rgba(239,180,108,0.045); }
.learn-band h3 { margin: 0; font-family: var(--serif); font-size: clamp(23px, 3vw, 33px); font-weight: 400; line-height: 1.2; }
.learn-band p { margin: 0; color: var(--muted); font-size: 11px; line-height: 1.8; }

/* Practice */
.practice-layout { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(245px, 0.6fr); gap: 14px; }
.quiz-panel { position: relative; }
.quiz-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 15px; }
.quiz-score { color: var(--mint); font-size: 9px; }
.quiz-stage { display: grid; grid-template-columns: minmax(250px, 0.9fr) minmax(190px, 1.1fr); align-items: center; min-height: 330px; margin: 22px 0 20px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: rgba(0,0,0,0.09); }
.quiz-diagram { justify-self: center; }
.quiz-question { padding: 25px; }
.quiz-question p { margin: 8px 0 10px; font-family: var(--serif); font-size: 28px; line-height: 1.2; }
.quiz-hint { display: block; color: var(--faint); font-size: 8px; line-height: 1.7; text-transform: none; }
.quiz-options { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 6px; }
.quiz-option { min-height: 44px; border: 1px solid var(--line-strong); color: var(--muted); background: transparent; font-family: var(--mono); font-size: 12px; }
.quiz-option:hover { border-color: var(--mint); color: var(--ink); background: rgba(154,216,188,0.07); }
.quiz-option:disabled { cursor: default; }
.quiz-option.is-correct { border-color: var(--mint); color: #101715; background: var(--mint); }
.quiz-option.is-wrong { border-color: var(--red); color: var(--red); background: rgba(238,123,117,0.08); }
.quiz-feedback { min-height: 24px; margin-top: 16px; color: var(--muted); font-size: 11px; }
.quiz-feedback.is-correct { color: var(--mint); }
.quiz-feedback.is-wrong { color: var(--red); }
.quiz-next { margin-top: 4px; }
.practice-side { display: flex; flex-direction: column; }
.practice-side h3 { margin: 6px 0 27px; font-family: var(--serif); font-size: 25px; font-weight: 400; }
.practice-steps { display: flex; flex-direction: column; gap: 0; margin: 0; padding: 0; list-style: none; }
.practice-steps li { display: grid; grid-template-columns: 29px 1fr; gap: 8px; padding: 14px 0; border-top: 1px solid var(--line); }
.practice-steps li span { color: var(--amber); font-family: var(--mono); font-size: 9px; }
.practice-steps li p { margin: 0; color: var(--muted); font-size: 11px; line-height: 1.65; }
.practice-quote { margin-top: auto; padding-top: 25px; color: var(--mint); font-size: 9px; line-height: 1.8; text-transform: none; }
.toast { position: fixed; right: 26px; bottom: 24px; z-index: 10; max-width: min(340px, calc(100vw - 40px)); padding: 11px 14px; border: 1px solid var(--mint); color: var(--mint); background: #121a17; box-shadow: var(--shadow); font-family: var(--mono); font-size: 10px; opacity: 0; pointer-events: none; transform: translateY(8px); transition: 180ms ease; }
.toast.is-visible { opacity: 1; transform: none; }

/* Encyclopedia / theory / audio practice */
.view-heading > p:empty { display: none; }
.encyclopedia-panel, .theory-lab, .chord-check-panel { margin-top: 14px; padding: 21px; }
.encyclopedia-heading { margin-bottom: 13px; }
.encyclopedia-tools { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(150px, 0.5fr); gap: 7px 12px; align-items: end; margin-bottom: 14px; }
.encyclopedia-tools .field-label { grid-row: 1; margin: 0; }
.text-input, .dark-select, .number-input { width: 100%; min-height: 38px; padding: 9px 11px; border: 1px solid var(--line-strong); border-radius: var(--radius); color: var(--ink); background: var(--surface-2); outline: none; }
.text-input { grid-row: 2; }
.encyclopedia-tools .dark-select { grid-row: 2; }
.text-input:focus, .dark-select:focus, .number-input:focus { border-color: var(--mint); }
.encyclopedia-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 5px; max-height: 560px; overflow: auto; padding-right: 3px; }
.encyclopedia-card { min-width: 0; min-height: 105px; padding: 11px 10px; border: 1px solid var(--line); border-radius: var(--radius); color: var(--muted); background: rgba(255,255,255,0.018); text-align: left; transition: 150ms ease; }
.encyclopedia-card:hover, .encyclopedia-card.is-active { border-color: var(--mint-deep); color: var(--ink); background: rgba(154,216,188,0.075); transform: translateY(-1px); }
.encyclopedia-card-top { display: flex; justify-content: space-between; gap: 4px; color: var(--amber); font-family: var(--mono); font-size: 8px; }
.encyclopedia-card-top em { color: var(--faint); font-style: normal; }
.encyclopedia-card strong, .encyclopedia-card small, .encyclopedia-notes { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.encyclopedia-card strong { margin-top: 9px; color: var(--ink); font-family: var(--serif); font-size: 21px; font-weight: 400; }
.encyclopedia-card small { margin-top: 2px; color: var(--faint); font-family: var(--mono); font-size: 8px; }
.encyclopedia-notes { margin-top: 9px; color: var(--mint); font-family: var(--mono); font-size: 9px; }
.theory-lab .panel-lead { margin-bottom: 14px; }
.theory-controls { display: grid; grid-template-columns: 150px 120px 1fr; gap: 9px; align-items: end; }
.theory-controls .field-label { margin: 0; }
.theory-type-list { display: flex; flex-wrap: wrap; gap: 4px; grid-column: 3; }
.theory-type-button { min-width: 46px; min-height: 40px; padding: 5px 7px; border: 1px solid var(--line); border-radius: var(--radius); color: var(--muted); background: transparent; font-family: var(--mono); font-size: 11px; }
.theory-type-button small { display: block; margin-top: 2px; color: var(--faint); font-size: 7px; }
.theory-type-button:hover, .theory-type-button.is-active { border-color: var(--mint); color: var(--mint); background: rgba(154,216,188,0.08); }
.theory-comparison { display: grid; grid-template-columns: minmax(0, 1fr) 28px minmax(0, 1fr); gap: 8px; align-items: center; margin-top: 15px; }
.theory-card { min-height: 172px; padding: 15px; border: 1px solid var(--line); background: rgba(255,255,255,0.02); }
.theory-card.is-selected { border-color: rgba(154,216,188,0.35); background: rgba(154,216,188,0.06); }
.theory-card-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.theory-card-head span { color: var(--faint); font-family: var(--mono); font-size: 8px; }
.theory-card-head strong { color: var(--mint); font-family: var(--serif); font-size: 23px; font-weight: 400; }
.theory-note-row { display: flex; flex-wrap: wrap; gap: 5px; margin: 17px 0 12px; }
.theory-note-chip { display: grid; min-width: 45px; padding: 6px 7px; border: 1px solid var(--line); text-align: center; }
.theory-note-chip b { font-family: var(--mono); font-size: 12px; font-weight: 500; }
.theory-note-chip small { margin-top: 2px; color: var(--faint); font-family: var(--mono); font-size: 8px; }
.theory-note-chip.is-root { border-color: var(--amber-soft); color: var(--amber); }
.theory-note-chip.is-changed { border-color: var(--mint); color: var(--mint); }
.theory-card .ghost-button { min-height: 29px; }
.theory-arrow { color: var(--amber); font-family: var(--serif); font-size: 28px; text-align: center; }
.theory-change { min-height: 26px; margin: 0 0 8px; color: var(--mint); font-family: var(--mono); font-size: 9px; }
.tuner-layout, .studio-layout { display: grid; grid-template-columns: minmax(280px, 0.78fr) minmax(0, 1.22fr); gap: 14px; }
.tuner-control-panel, .studio-control-panel, .tuner-meter-panel, .rhythm-panel { padding: 21px; }
.tuner-control-panel .panel-lead, .studio-control-panel .panel-lead { margin-bottom: 18px; }
.tuner-control-panel .field-label, .studio-fields .field-label { margin-top: 13px; }
.tuner-string-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px; margin-top: 12px; }
.string-chip { min-height: 43px; padding: 6px; border: 1px solid var(--line); color: var(--muted); background: transparent; font-family: var(--mono); font-size: 8px; }
.string-chip strong { display: block; margin-top: 2px; color: var(--ink); font-size: 12px; font-weight: 500; }
.string-chip:hover, .string-chip.is-active { border-color: var(--mint); color: var(--mint); background: rgba(154,216,188,0.08); }
.tuner-actions { display: flex; gap: 6px; margin-top: 18px; }
.tuner-actions > * { flex: 1; }
.privacy-note { margin: 13px 0 0; color: var(--faint); font-family: var(--mono); font-size: 8px; line-height: 1.6; }
.meter-topline { display: flex; justify-content: space-between; gap: 10px; }
.tuner-meter-panel { display: flex; min-height: 430px; flex-direction: column; justify-content: center; text-align: center; }
.tuner-note { margin-top: 35px; color: var(--mint); font-family: var(--serif); font-size: clamp(90px, 13vw, 165px); font-weight: 400; letter-spacing: -0.08em; line-height: 0.85; }
.tuner-frequency { min-height: 26px; margin-top: 17px; color: var(--muted); font-family: var(--mono); font-size: 10px; }
.tuner-needle-wrap { margin: 31px auto 0; width: min(520px, 90%); }
.tuner-scale { display: flex; justify-content: space-between; margin-bottom: 8px; color: var(--faint); font-family: var(--mono); font-size: 8px; }
.tuner-needle-track { position: relative; height: 7px; border-radius: 7px; background: linear-gradient(90deg, var(--red), var(--amber) 38%, var(--mint) 50%, var(--amber) 62%, var(--red)); }
.tuner-center-line { position: absolute; top: -8px; bottom: -8px; left: 50%; width: 1px; background: var(--ink); opacity: 0.6; }
.tuner-needle { position: absolute; top: -11px; left: 50%; width: 2px; height: 29px; background: var(--ink); box-shadow: 0 0 10px rgba(243,238,231,0.4); transition: left 90ms linear; }
.tuner-needle.is-good { background: var(--mint); box-shadow: 0 0 15px var(--mint); }
.tuner-cents { margin-top: 18px; color: var(--ink); font-family: var(--mono); font-size: 13px; }
.tuner-message { min-height: 25px; margin: 7px 0 0; color: var(--muted); font-family: var(--mono); font-size: 10px; }
.tuner-message.is-good { color: var(--mint); }
.small-status.is-live { color: var(--mint); }
.studio-fields { display: grid; grid-template-columns: 1fr; }
.bpm-row { display: grid; grid-template-columns: 1fr 48px auto; gap: 8px; align-items: center; }
.bpm-row input[type="range"] { width: 100%; accent-color: var(--mint); }
.bpm-row output { color: var(--mint); font-family: var(--mono); font-size: 15px; text-align: center; }
.bpm-row .ghost-button { min-height: 31px; padding: 0 9px; }
.toggle-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 17px; color: var(--muted); font-family: var(--mono); font-size: 9px; }
.toggle-row label { display: flex; align-items: center; gap: 5px; }
.toggle-row input { accent-color: var(--mint); }
.studio-target { display: grid; grid-template-columns: 1fr auto; gap: 5px 10px; align-items: center; margin-top: 22px; padding-top: 15px; border-top: 1px solid var(--line); }
.studio-target .field-label { grid-column: 1 / -1; margin: 0; }
.studio-target strong { color: var(--mint); font-family: var(--serif); font-size: 31px; font-weight: 400; }
.studio-target .ghost-button { min-height: 30px; }
.rhythm-panel { min-height: 430px; }
.rhythm-pattern-name { margin-top: 43px; color: var(--ink); font-family: var(--serif); font-size: clamp(30px, 4vw, 50px); font-weight: 400; line-height: 1.05; }
.rhythm-pattern-description { min-height: 22px; margin: 8px 0 0; color: var(--muted); font-size: 11px; }
.rhythm-pattern-grid { display: grid; grid-template-columns: repeat(8, minmax(0, 1fr)); gap: 5px; margin-top: 35px; }
.rhythm-step { display: grid; min-height: 91px; place-items: center; border: 1px solid var(--line); background: rgba(255,255,255,0.02); transition: 100ms ease; }
.rhythm-step small { align-self: end; color: var(--faint); font-family: var(--mono); font-size: 9px; }
.rhythm-step strong { align-self: start; margin-top: 7px; color: var(--mint); font-family: var(--mono); font-size: 22px; font-weight: 400; }
.rhythm-step.is-current { border-color: var(--amber); background: rgba(239,180,108,0.15); transform: translateY(-3px); }
.rhythm-step.is-current strong { color: var(--amber); }
.rhythm-legend { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 15px; color: var(--faint); font-family: var(--mono); font-size: 8px; }
.rhythm-legend b { color: var(--mint); font-size: 11px; }
.studio-now-playing { margin-top: 36px; padding-top: 13px; border-top: 1px solid var(--line); color: var(--muted); font-family: var(--mono); font-size: 9px; }
.chord-check-panel { margin-bottom: 14px; }
.chord-check-panel .panel-lead { margin-bottom: 17px; }
.check-target-row { display: flex; align-items: end; justify-content: space-between; gap: 15px; padding: 13px 0 16px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.check-target-row strong { display: block; margin-top: 5px; color: var(--mint); font-family: var(--serif); font-size: 38px; font-weight: 400; line-height: 0.95; }
.check-target-row small { display: block; margin-top: 6px; color: var(--faint); font-family: var(--mono); font-size: 9px; }
.check-actions { display: flex; gap: 6px; }
.check-actions > * { min-width: 110px; }
.check-result-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; padding-top: 17px; }
.check-result-grid > div + div { padding-left: 20px; border-left: 1px solid var(--line); }
.check-result-grid strong { display: block; margin: 7px 0 4px; color: var(--amber); font-family: var(--serif); font-size: 36px; font-weight: 400; }
.check-result-grid p { min-height: 20px; margin: 4px 0 11px; color: var(--muted); font-size: 10px; }
.song-layout { display: grid; grid-template-columns: minmax(255px, 0.55fr) minmax(0, 1.45fr); gap: 14px; }
.song-library-panel, .song-score-panel { padding: 21px; }
.song-library-panel .dark-select { margin-bottom: 7px; }
.song-full-button { width: 100%; }
.file-drop { display: grid; min-height: 105px; place-items: center; margin-top: 14px; padding: 15px; border: 1px dashed var(--line-strong); color: var(--muted); text-align: center; cursor: pointer; }
.file-drop:hover { border-color: var(--mint); color: var(--mint); background: rgba(154,216,188,0.05); }
.file-drop span { color: var(--amber); font-size: 23px; line-height: 1; }
.file-drop strong, .file-drop small { display: block; }
.file-drop strong { margin-top: 3px; font-family: var(--mono); font-size: 10px; font-weight: 400; }
.file-drop small { margin-top: 2px; color: var(--faint); font-family: var(--mono); font-size: 8px; }
#songFile { position: absolute; width: 1px; height: 1px; overflow: hidden; opacity: 0; }
.song-library-panel > .field-label { margin-top: 19px; }
.song-url-row { display: grid; grid-template-columns: 1fr auto; gap: 5px; }
.song-url-row .text-input { min-width: 0; }
.song-url-row .ghost-button { min-height: 38px; }
.song-score-panel { min-width: 0; }
.song-score-head { display: flex; align-items: start; justify-content: space-between; gap: 15px; padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.song-score-head h3 { margin: 6px 0 2px; color: var(--ink); font-family: var(--serif); font-size: clamp(30px, 5vw, 58px); font-weight: 400; letter-spacing: -0.06em; line-height: 1; }
.song-score-head p { margin: 0; color: var(--muted); font-size: 10px; }
.song-meta { display: grid; min-width: 110px; padding-left: 15px; border-left: 1px solid var(--line); text-align: right; }
.song-meta strong { color: var(--mint); font-family: var(--serif); font-size: 31px; font-weight: 400; line-height: 1; }
.song-meta span, .song-meta small { color: var(--faint); font-family: var(--mono); font-size: 8px; }
.song-meta small { margin-top: 12px; white-space: normal; }
.song-measures { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 6px; padding: 22px 0; }
.song-measure { display: grid; min-height: 115px; align-content: space-between; padding: 11px; border: 1px solid var(--line); color: var(--muted); background: rgba(255,255,255,0.018); text-align: left; transition: 120ms ease; }
.song-measure:hover, .song-measure.is-current { border-color: var(--amber); color: var(--ink); background: rgba(239,180,108,0.1); transform: translateY(-2px); }
.song-measure span, .song-measure small { color: var(--faint); font-family: var(--mono); font-size: 8px; }
.song-measure strong { color: var(--mint); font-family: var(--serif); font-size: 34px; font-weight: 400; }
.song-transport { display: flex; align-items: end; justify-content: space-between; gap: 20px; padding: 16px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.song-transport > div:first-child { display: grid; gap: 5px; min-width: 130px; }
.song-transport > div:first-child strong { color: var(--amber); font-family: var(--mono); font-size: 16px; font-weight: 400; }
.song-transport > div:first-child b { color: var(--mint); font-family: var(--serif); font-size: 28px; font-weight: 400; }
.song-transport-actions { display: flex; align-items: end; justify-content: end; gap: 6px; flex-wrap: wrap; }
.song-bpm-control { display: grid; grid-template-columns: auto 100px 36px; gap: 7px; align-items: center; color: var(--muted); font-family: var(--mono); font-size: 9px; }
.song-bpm-control input { width: 100px; accent-color: var(--mint); }
.song-bpm-control output { color: var(--mint); font-size: 13px; text-align: right; }
.song-transport-actions .primary-button { width: auto; }
.song-score-note { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; color: var(--faint); font-family: var(--mono); font-size: 8px; }
.song-score-note span { padding: 4px 7px; border: 1px solid var(--line); }

@media (max-width: 1100px) {
  .song-layout { grid-template-columns: 1fr; }
}

@media (max-width: 650px) {
  .song-measures { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .song-score-head, .song-transport { align-items: stretch; flex-direction: column; }
  .song-meta { grid-template-columns: auto auto; gap: 4px 8px; min-width: 0; padding: 10px 0 0; border-top: 1px solid var(--line); border-left: 0; text-align: left; }
  .song-meta small { grid-column: 1 / -1; margin: 0; }
  .song-transport-actions { align-items: stretch; justify-content: stretch; flex-direction: column; }
  .song-bpm-control { grid-template-columns: auto 1fr 40px; }
  .song-bpm-control input { width: 100%; }
  .song-transport-actions .primary-button { width: 100%; }
}

@media (max-width: 1100px) {
  .encyclopedia-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (max-width: 650px) {
  .encyclopedia-tools, .theory-controls, .theory-comparison, .tuner-layout, .studio-layout, .check-result-grid { grid-template-columns: 1fr; }
  .theory-type-list { grid-column: auto; }
  .theory-arrow { transform: rotate(90deg); }
  .encyclopedia-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); max-height: none; }
  .tuner-meter-panel, .rhythm-panel { min-height: 360px; }
  .rhythm-pattern-grid { gap: 3px; }
  .rhythm-step { min-height: 70px; }
  .check-target-row { align-items: stretch; flex-direction: column; }
  .check-actions > * { flex: 1; }
  .check-result-grid > div + div { padding: 15px 0 0; border-top: 1px solid var(--line); border-left: 0; }
}

@media (max-width: 1100px) {
  .content-wrap { padding-left: 30px; padding-right: 30px; }
  .topbar { padding-left: 30px; padding-right: 30px; }
  .inspector-content { grid-template-columns: minmax(245px, 0.8fr) minmax(230px, 1.1fr); }
  .note-card small { font-size: 7px; }
  .lesson-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 830px) {
  .sidebar { display: none; }
  .mobile-brand { display: flex; }
  .topbar { gap: 20px; }
  .global-search { width: min(340px, 48%); margin-left: auto; }
  .topbar-meta { display: none; }
}

@media (max-width: 650px) {
  .topbar { min-height: 62px; padding: 0 18px; }
  .global-search { width: 33px; margin-left: 0; border-bottom: 0; }
  .global-search input, .global-search kbd { display: none; }
  .search-icon { font-size: 25px; }
  .content-wrap { padding: 31px 15px 50px; }
  .view-heading { display: block; margin-bottom: 22px; }
  .view-heading h2 { font-size: 35px; }
  .view-heading > p { margin-top: 11px; }
  .explore-grid, .reverse-grid, .progression-layout, .practice-layout { grid-template-columns: 1fr; }
  .control-panel, .finder-panel, .results-panel, .preset-panel, .builder-panel, .quiz-panel, .practice-side { padding: 18px; }
  .inspector-topline, .inspector-footer { padding-left: 18px; padding-right: 18px; }
  .chord-heading-row { align-items: flex-start; flex-direction: column; padding-left: 18px; padding-right: 18px; }
  .chord-heading-row h3 { font-size: 74px; }
  .chord-actions { justify-content: flex-start; }
  .inspector-content { grid-template-columns: 1fr; }
  .diagram-column { min-height: 330px; border-right: 0; border-bottom: 1px solid var(--line); }
  .chord-explanation { padding: 20px 18px 18px; }
  .insight-block { margin-top: 0; }
  .explore-lower, .learn-intro, .learn-band { grid-template-columns: 1fr; display: grid; gap: 18px; padding: 18px; }
  .micro-guide { gap: 5px; }
  .micro-guide > div { padding: 9px; }
  .micro-guide span { margin-bottom: 11px; }
  .finder-notes { grid-template-columns: repeat(4, 1fr); }
  .builder-head { align-items: stretch; flex-direction: column; }
  .key-picker { justify-content: space-between; }
  .key-picker select { width: 60%; }
  .slot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .progression-strip { grid-template-columns: repeat(2, 1fr); }
  .builder-footer { align-items: stretch; flex-direction: column; }
  .primary-button { width: 100%; }
  .lesson-grid { grid-template-columns: 1fr; }
  .lesson-card { min-height: 0; }
  .lesson-card p { min-height: 0; }
  .quiz-stage { grid-template-columns: 1fr; min-height: 0; }
  .quiz-question { padding: 0 18px 22px; }
  .quiz-question p { font-size: 25px; }
  .quiz-options { grid-template-columns: repeat(2, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

/* Purpose navigation and focused practice */
.sidebar-purpose { margin-top: 30px; }
.purpose-list { display: grid; gap: 2px; }
.purpose-list > div { display: grid; grid-template-columns: 25px 1fr; padding: 10px 8px; border-top: 1px solid var(--line); }
.purpose-list span { color: var(--mint); font-family: var(--mono); font-size: 9px; }
.purpose-list strong { color: var(--ink); font-size: 12px; font-weight: 500; }
.purpose-list small { grid-column: 2; color: var(--faint); font-size: 9px; }
.app-footer { position: fixed; z-index: 20; right: 0; bottom: 0; left: 248px; display: grid; grid-template-columns: 130px minmax(300px, 0.8fr) minmax(420px, 1.2fr); align-items: center; gap: 22px; min-height: 82px; padding: 12px clamp(22px, 4vw, 65px); border-top: 1px solid var(--line-strong); background: rgba(17, 18, 22, 0.95); box-shadow: 0 -12px 40px rgba(0, 0, 0, 0.22); backdrop-filter: blur(18px); }
.footer-route-label { display: grid; gap: 1px; }
.footer-route-label .eyebrow { margin: 0; font-size: 8px; }
.footer-route-label strong { color: var(--ink); font-family: var(--serif); font-size: 21px; font-weight: 400; }
.footer-nav { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 4px; }
.footer-nav-link { display: flex; align-items: center; justify-content: center; gap: 7px; min-height: 45px; border: 1px solid transparent; border-radius: var(--radius); color: var(--muted); background: transparent; font-size: 11px; transition: 160ms ease; }
.footer-nav-link:hover { color: var(--ink); background: rgba(255,255,255,0.05); }
.footer-nav-link.is-active { border-color: rgba(154,216,188,0.36); color: var(--mint); background: rgba(154,216,188,0.09); }
.footer-icon { color: var(--amber); font-family: var(--serif); font-size: 19px; line-height: 1; }
.footer-subnav { min-width: 0; }
.footer-subnav-group { display: none; flex-wrap: wrap; align-items: center; justify-content: flex-end; gap: 5px; }
.footer-subnav-group.is-active { display: flex; }
.footer-subnav-group button { min-height: 30px; padding: 0 9px; border: 1px solid var(--line); border-radius: 3px; color: var(--muted); background: rgba(255,255,255,0.025); font-size: 10px; transition: 160ms ease; }
.footer-subnav-group button:hover, .footer-subnav-group button.is-active { border-color: var(--mint-deep); color: var(--ink); background: rgba(154,216,188,0.08); }
.content-wrap { padding-bottom: 170px; }

.mobile-view-nav { display: none; }

@media (max-width: 830px) {
  .mobile-view-nav {
    display: flex;
    gap: 4px;
    overflow-x: auto;
    padding: 8px 18px;
    border-bottom: 1px solid var(--line);
    background: rgba(17, 18, 22, 0.96);
    scrollbar-width: none;
  }
  .mobile-view-nav::-webkit-scrollbar { display: none; }
  .mobile-view-link {
    flex: 0 0 auto;
    min-height: 34px;
    padding: 0 12px;
    border: 1px solid transparent;
    border-radius: var(--radius);
    color: var(--muted);
    background: transparent;
    font-size: 11px;
    white-space: nowrap;
  }
  .mobile-view-link.is-active {
    border-color: rgba(154, 216, 188, 0.36);
    color: var(--mint);
    background: rgba(154, 216, 188, 0.09);
  }
}

.content-wrap { padding-bottom: 72px; }
.practice-switcher { display: flex; gap: 5px; margin-bottom: 14px; padding: 5px; border: 1px solid var(--line); background: rgba(255,255,255,0.018); }
.practice-tab { flex: 1; min-height: 40px; border: 1px solid transparent; border-radius: 3px; color: var(--muted); background: transparent; font-size: 11px; transition: 160ms ease; }
.practice-tab:hover { color: var(--ink); background: rgba(255,255,255,0.04); }
.practice-tab.is-active { border-color: rgba(154,216,188,0.35); color: var(--mint); background: rgba(154,216,188,0.09); }
.practice-mode-panel { display: none; }
.practice-mode-panel.is-active { display: block; }
.practice-layout.practice-mode-panel.is-active { display: grid; }
.ear-quiz-panel { padding: 24px; }
.ear-mode-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: -4px 0 20px; padding-bottom: 13px; border-bottom: 1px solid var(--line); }
.ear-mode-row .field-label { margin: 0; }
.ear-mode-tabs { display: flex; gap: 4px; }
.ear-mode-tab { min-width: 74px; min-height: 30px; padding: 0 10px; border: 1px solid var(--line); border-radius: 3px; color: var(--muted); background: transparent; font-size: 10px; }
.ear-mode-tab.is-active { border-color: var(--amber-soft); color: var(--amber); background: rgba(239,180,108,0.08); }
.ear-quiz-stage { display: grid; grid-template-columns: minmax(220px, 0.72fr) minmax(280px, 1.28fr); gap: 14px; }
.ear-sound-card, .ear-answer-card { min-height: 205px; padding: 24px; border: 1px solid var(--line); background: rgba(0,0,0,0.12); }
.ear-sound-card { display: flex; flex-direction: column; align-items: flex-start; justify-content: center; }
.ear-sound-card strong { margin: 10px 0 22px; color: var(--ink); font-family: var(--serif); font-size: clamp(25px, 3vw, 38px); font-weight: 400; letter-spacing: -0.04em; line-height: 1.1; }
.ear-play-button { width: 100%; }
.ear-sound-card small { margin-top: 10px; color: var(--faint); font-size: 10px; }
.ear-answer-card .field-label { margin-bottom: 16px; }
.ear-quiz-options { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 7px; }
.ear-answer-button { min-height: 62px; border: 1px solid var(--line-strong); border-radius: var(--radius); color: var(--ink); background: rgba(255,255,255,0.03); font-family: var(--serif); font-size: 22px; transition: 160ms ease; }
.ear-answer-button:hover:not(:disabled) { border-color: var(--mint); color: var(--mint); background: rgba(154,216,188,0.08); transform: translateY(-2px); }
.ear-answer-button small { display: block; margin-top: 2px; color: var(--faint); font-family: var(--mono); font-size: 9px; }
.ear-answer-button.is-correct { border-color: var(--mint); color: var(--mint); background: rgba(154,216,188,0.12); }
.ear-answer-button.is-wrong { border-color: var(--red); color: var(--red); background: rgba(238,123,117,0.08); }
.ear-answer-button:disabled { cursor: default; }
.ear-quiz-panel .quiz-feedback { margin-top: 14px; }
.ear-quiz-panel .quiz-next { margin-top: 13px; }
@media (max-width: 1100px) {
  .app-footer { grid-template-columns: 100px minmax(260px, 0.8fr) minmax(300px, 1.2fr); gap: 10px; }
  .footer-subnav-group button { padding: 0 6px; font-size: 9px; }
}
@media (min-width: 831px) {
  .main-shell { display: flex; flex-direction: column; min-height: 100vh; }
  .content-wrap { flex: 1; }
  .app-footer { position: static; left: auto; flex: 0 0 auto; }
}
@media (max-width: 830px) {
  .app-footer { left: 0; grid-template-columns: 100px minmax(270px, 1fr); }
  .footer-subnav { grid-column: 1 / -1; grid-row: 2; }
  .footer-subnav-group { justify-content: center; }
  .app-footer { min-height: 122px; }
  .content-wrap { padding-bottom: 205px; }
}
@media (max-width: 650px) {
  .app-footer { grid-template-columns: 1fr; gap: 5px; min-height: 139px; padding: 8px 10px 9px; }
  .footer-route-label { display: none; }
  .footer-nav { grid-template-columns: repeat(4, 1fr); }
  .footer-nav-link { min-height: 42px; flex-direction: column; gap: 1px; font-size: 9px; }
  .footer-icon { font-size: 16px; }
  .footer-subnav { grid-column: auto; grid-row: auto; }
  .footer-subnav-group { gap: 3px; }
  .footer-subnav-group button { min-height: 27px; padding: 0 6px; font-size: 8px; }
  .content-wrap { padding-bottom: 220px; }
  .practice-switcher { overflow-x: auto; }
  .practice-tab { min-width: 100px; white-space: nowrap; }
  .ear-quiz-panel { padding: 18px; }
  .ear-mode-row { align-items: stretch; flex-direction: column; }
  .ear-mode-tabs { width: 100%; }
  .ear-mode-tab { flex: 1; }
  .ear-quiz-stage { grid-template-columns: 1fr; }
  .ear-sound-card, .ear-answer-card { min-height: 0; padding: 18px; }
}

/* Single learning workspace redesign */
.encyclopedia-panel { margin-top: 18px; }
.encyclopedia-panel > summary { cursor: pointer; list-style: none; }
.encyclopedia-panel > summary::-webkit-details-marker { display: none; }
.encyclopedia-panel > summary::after { content: "＋"; color: var(--amber); font-family: var(--mono); font-size: 18px; }
.encyclopedia-panel[open] > summary::after { content: "−"; }
.encyclopedia-panel[open] > summary { border-bottom: 1px solid var(--line); }
.optional-hidden { display: none !important; }
.integrated-section { display: none; margin-top: 52px; padding-top: 26px; border-top: 1px solid var(--line-strong); scroll-margin-top: 28px; }
.integrated-section.is-active { display: block; animation: enter 220ms ease both; }
#view-explore { margin-top: 0; padding-top: 0; border-top: 0; }
.content-wrap { padding-bottom: 72px; }
.lesson-route { display: grid; gap: 0; margin: 0; padding: 0; list-style: none; }
.lesson-route li { display: grid; grid-template-columns: 25px 1fr; gap: 0 6px; padding: 12px 8px; border-top: 1px solid var(--line); }
.lesson-route li:last-child { border-bottom: 1px solid var(--line); }
.lesson-route span { color: var(--amber); font-family: var(--mono); font-size: 9px; }
.lesson-route strong { color: var(--ink); font-size: 12px; font-weight: 500; }
.lesson-route small { grid-column: 2; color: var(--faint); font-size: 9px; }

.theory-workspace { margin-top: 18px; padding: clamp(20px, 3vw, 32px); background: linear-gradient(140deg, rgba(154,216,188,0.045), rgba(255,255,255,0.012)); }
.theory-workspace-intro { max-width: 680px; }
.theory-workspace-intro h3 { margin: 7px 0 8px; color: var(--ink); font-family: var(--serif); font-size: clamp(28px, 3.5vw, 42px); font-weight: 400; letter-spacing: -0.045em; line-height: 1.08; }
.theory-workspace-intro p { max-width: 610px; margin: 0; color: var(--muted); font-size: 12px; line-height: 1.9; }
.theory-key-row { display: flex; align-items: end; justify-content: space-between; gap: 16px; margin: 26px 0 15px; padding-top: 17px; border-top: 1px solid var(--line); }
.theory-key-row .field-label { margin: 0; }
.theory-key-row select { width: 150px; }
.theory-workspace-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.theory-mini-card { min-height: 230px; padding: 19px; border: 1px solid var(--line); background: rgba(0,0,0,0.12); }
.theory-mini-card h4 { margin: 7px 0 15px; color: var(--ink); font-family: var(--serif); font-size: 22px; font-weight: 400; letter-spacing: -0.035em; }
.theory-step { color: var(--amber); font-family: var(--mono); font-size: 9px; letter-spacing: 0.14em; }
.inline-theory-content { color: var(--muted); font-size: 11px; line-height: 1.75; }
.inline-theory-content p { margin: 13px 0 0; }
.inline-formula { display: grid; gap: 3px; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
.inline-formula strong { color: var(--mint); font-family: var(--mono); font-size: 15px; font-weight: 500; }
.inline-formula span { color: var(--faint); font-size: 10px; }
.inline-note-strip { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 13px; }
.inline-note-chip { display: grid; min-width: 47px; padding: 5px 7px; border: 1px solid var(--line-strong); border-radius: 3px; text-align: center; background: rgba(255,255,255,0.025); }
.inline-note-chip.is-root { border-color: rgba(239,180,108,0.55); background: rgba(239,180,108,0.08); }
.inline-note-chip b { color: var(--ink); font-family: var(--serif); font-size: 16px; font-weight: 400; }
.inline-note-chip small { color: var(--faint); font-family: var(--mono); font-size: 8px; }
.inline-muted { display: block; margin-top: 12px; color: var(--faint); font-size: 10px; line-height: 1.6; }
.function-result { display: flex; align-items: center; gap: 10px; min-height: 59px; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
.function-result > div { display: grid; gap: 3px; }
.function-result strong { color: var(--ink); font-family: var(--serif); font-size: 18px; font-weight: 400; }
.function-result small { color: var(--faint); font-size: 9px; }
.function-result.is-outside strong { color: var(--muted); font-size: 16px; }
.function-badge { display: grid; place-items: center; width: 36px; height: 36px; border: 1px solid var(--line-strong); border-radius: 50%; color: var(--muted); font-family: var(--mono); font-size: 13px; }
.function-badge.function-t { border-color: rgba(154,216,188,0.55); color: var(--mint); background: rgba(154,216,188,0.08); }
.function-badge.function-s { border-color: rgba(239,180,108,0.55); color: var(--amber); background: rgba(239,180,108,0.08); }
.function-badge.function-d { border-color: rgba(238,123,117,0.55); color: var(--red); background: rgba(238,123,117,0.08); }
.theory-action-card p { margin: 0 0 15px; color: var(--muted); font-size: 11px; line-height: 1.75; }
.inline-action-list { display: grid; gap: 7px; }
.inline-action-list button { width: 100%; min-height: 37px; }
.diatonic-section { margin-top: 18px; padding-top: 18px; border-top: 1px solid var(--line); }
.diatonic-heading { display: flex; align-items: end; justify-content: space-between; gap: 16px; margin-bottom: 13px; }
.diatonic-heading h4 { margin: 7px 0 0; color: var(--ink); font-family: var(--serif); font-size: 25px; font-weight: 400; }
.diatonic-heading p { margin: 0; color: var(--faint); font-size: 10px; }
.inline-diatonic-map { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 6px; }
.diatonic-card { display: grid; gap: 4px; min-width: 0; padding: 10px 8px; border: 1px solid var(--line); border-radius: 3px; text-align: left; background: rgba(255,255,255,0.025); transition: 160ms ease; }
.diatonic-card:hover, .diatonic-card.is-selected { border-color: var(--mint-deep); background: rgba(154,216,188,0.09); transform: translateY(-2px); }
.diatonic-degree { color: var(--amber); font-family: var(--mono); font-size: 10px; }
.diatonic-card strong { overflow: hidden; color: var(--ink); font-family: var(--serif); font-size: 20px; font-weight: 400; text-overflow: ellipsis; }
.diatonic-card small { overflow: hidden; color: var(--faint); font-size: 8px; text-overflow: ellipsis; white-space: nowrap; }
.diatonic-card small b { color: var(--mint); font-family: var(--mono); font-size: 9px; }
#view-tuner .tuner-control-panel h3 { font-size: 20px; }

@media (max-width: 900px) {
  .theory-workspace-grid { grid-template-columns: 1fr; }
  .theory-mini-card { min-height: 0; }
  .inline-diatonic-map { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
@media (max-width: 650px) {
  .content-wrap { padding: 24px 15px 58px; }
  .lesson-route { display: none; }
  .theory-workspace { padding: 18px; }
  .theory-workspace-intro h3 { font-size: 31px; }
  .theory-key-row { align-items: stretch; flex-direction: column; }
  .theory-key-row select { width: 100%; }
  .diatonic-heading { align-items: flex-start; flex-direction: column; }
  .inline-diatonic-map { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  #view-tuner::before, #view-studio::before, #view-progressions::before, #view-songs::before { font-size: 24px; }
}

/* Beginner course — one next action, not a feature directory */
#view-course { margin-top: 0; padding-top: 0; border-top: 0; }
.course-overview {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) minmax(280px, 0.95fr);
  align-items: end;
  gap: clamp(24px, 5vw, 70px);
  padding: 24px 0 27px;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}
.course-kicker, .course-lesson-label, .course-minutes, .course-practice-kicker { color: var(--amber); font-family: var(--mono); font-size: 9px; letter-spacing: 0.11em; text-transform: uppercase; }
.course-overview-copy strong { display: block; margin-top: 8px; color: var(--ink); font-family: var(--serif); font-size: clamp(25px, 3vw, 38px); font-weight: 400; letter-spacing: -0.04em; line-height: 1.1; }
.course-overview-copy p { margin: 8px 0 0; color: var(--muted); font-size: 12px; }
.course-progress-block { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 11px 14px; }
.course-progress-track { grid-column: 1 / -1; position: relative; height: 8px; overflow: hidden; border: 1px solid var(--line-strong); background: rgba(255,255,255,0.025); }
.course-progress-track > span { display: block; width: 0; height: 100%; background: var(--mint); transition: width 260ms ease; }
.course-reset-button { justify-self: end; min-height: 36px; padding: 0 1px; border: 0; border-bottom: 1px solid var(--line-strong); color: var(--faint); background: transparent; font-size: 10px; }
.course-reset-button:hover { border-color: var(--amber); color: var(--ink); }

.course-layout { display: grid; grid-template-columns: minmax(230px, 0.58fr) minmax(0, 1.42fr); gap: 14px; margin-top: 18px; }
.course-step-panel, .course-lesson-panel { border: 1px solid var(--line); background: rgba(255,255,255,0.018); }
.course-step-panel { padding: 18px 12px 12px; }
.course-step-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; padding: 0 7px 13px; border-bottom: 1px solid var(--line); }
.course-step-heading span { color: var(--ink); font-size: 12px; font-weight: 600; }
.course-step-heading small { color: var(--faint); font-size: 9px; }
.course-step-list { display: grid; gap: 3px; padding-top: 7px; }
.course-step-button { display: grid; grid-template-columns: 30px minmax(0, 1fr) auto; align-items: center; min-height: 44px; width: 100%; gap: 8px; padding: 8px 7px; border: 1px solid transparent; border-radius: 3px; color: var(--muted); background: transparent; text-align: left; transition: 150ms ease; }
.course-step-button:hover:not(:disabled) { color: var(--ink); background: rgba(255,255,255,0.04); }
.course-step-button.is-current { border-color: rgba(239,180,108,0.48); color: var(--ink); background: rgba(239,180,108,0.075); }
.course-step-button.is-complete { color: var(--ink); }
.course-step-button:disabled { cursor: not-allowed; opacity: 0.42; }
.course-step-number { display: grid; place-items: center; width: 27px; height: 27px; border: 1px solid var(--line-strong); color: var(--faint); font-family: var(--mono); font-size: 9px; }
.course-step-button.is-current .course-step-number { border-color: var(--amber); color: var(--amber); }
.course-step-button.is-complete .course-step-number { border-color: rgba(154,216,188,0.48); color: var(--mint); background: rgba(154,216,188,0.07); }
.course-step-copy { min-width: 0; }
.course-step-copy strong, .course-step-copy small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.course-step-copy strong { font-size: 11px; font-weight: 600; }
.course-step-copy small { margin-top: 1px; color: var(--faint); font-size: 9px; }
.course-step-button em { color: var(--faint); font-family: var(--mono); font-size: 8px; font-style: normal; white-space: nowrap; }
.course-step-button.is-current em { color: var(--amber); }
.course-step-button.is-complete em { color: var(--mint); }

.course-lesson-panel { min-width: 0; padding: clamp(22px, 3vw, 34px); box-shadow: var(--shadow); }
.course-lesson-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; }
.course-lesson-head h3 { max-width: 720px; margin: 7px 0 0; color: var(--ink); font-family: var(--serif); font-size: clamp(30px, 4vw, 48px); font-weight: 400; letter-spacing: -0.05em; line-height: 1.08; text-wrap: pretty; }
.course-minutes { flex: 0 0 auto; margin-top: 2px; padding: 7px 9px; border: 1px solid var(--line-strong); color: var(--mint); }
.course-lesson-why { max-width: 710px; margin: 14px 0 26px; color: var(--muted); font-size: 12px; line-height: 1.8; }
.course-workspace { display: grid; grid-template-columns: minmax(250px, 0.86fr) minmax(290px, 1.14fr); min-height: 390px; border-top: 1px solid var(--line-strong); border-bottom: 1px solid var(--line-strong); }
.course-instructions { padding: 25px 25px 25px 0; border-right: 1px solid var(--line); }
.course-instructions h4 { margin: 0 0 19px; color: var(--ink); font-size: 14px; }
.course-instructions ol { display: grid; gap: 16px; margin: 0; padding: 0; list-style: none; counter-reset: course-action; }
.course-instructions li { position: relative; min-height: 34px; padding-left: 39px; color: var(--muted); font-size: 12px; line-height: 1.7; counter-increment: course-action; }
.course-instructions li::before { content: counter(course-action); position: absolute; top: 0; left: 0; display: grid; place-items: center; width: 25px; height: 25px; border: 1px solid var(--amber-soft); color: var(--amber); font-family: var(--mono); font-size: 9px; }
.course-pass-box { margin-top: 26px; padding: 15px 16px; border: 1px solid rgba(154,216,188,0.34); background: rgba(154,216,188,0.065); }
.course-pass-box span { color: var(--mint); font-family: var(--mono); font-size: 9px; letter-spacing: 0.1em; }
.course-pass-box p { margin: 6px 0 0; color: var(--ink); font-size: 12px; line-height: 1.65; }
.course-practice-area { display: flex; min-width: 0; flex-direction: column; justify-content: center; padding: 25px 0 25px 28px; background: rgba(0,0,0,0.08); }
.course-visual-heading { display: flex; align-items: center; justify-content: space-between; color: var(--faint); font-size: 9px; }
.course-visual-heading strong { color: var(--mint); font-family: var(--mono); font-size: 12px; font-weight: 500; }
.course-tuning-row { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 5px; margin-top: 27px; }
.course-tuning-row > div { display: grid; place-items: center; min-height: 82px; border: 1px solid var(--line-strong); background: rgba(255,255,255,0.025); }
.course-tuning-row small { color: var(--faint); font-size: 8px; }
.course-tuning-row strong { color: var(--mint); font-family: var(--serif); font-size: clamp(23px, 3vw, 34px); font-weight: 400; }
.course-visual-note, .course-finger-tip { margin: 20px 0 0; color: var(--faint); font-size: 10px; line-height: 1.7; }
.course-chord-heading, .course-rhythm-heading { display: flex; align-items: end; justify-content: space-between; gap: 12px; }
.course-chord-heading span, .course-rhythm-heading span { color: var(--faint); font-size: 10px; }
.course-chord-heading strong { color: var(--ink); font-family: var(--serif); font-size: 52px; font-weight: 400; letter-spacing: -0.06em; line-height: 0.9; }
.course-rhythm-heading strong { color: var(--mint); font-family: var(--mono); font-size: 16px; font-weight: 500; }
.course-diagram { width: min(100%, 320px); margin: -10px auto -20px; }
.course-diagram .diagram-caption { color: var(--faint); }
.course-diagram .diagram-dot.is-finger-number circle { fill: var(--amber); }
.course-diagram .diagram-dot.is-finger-number text { fill: #18120c; font-size: 11px; }
.course-diagram .diagram-legend { flex-wrap: wrap; gap: 4px 14px; line-height: 1.5; text-align: center; }
.course-finger-tip { padding-top: 13px; border-top: 1px solid var(--line); }
.course-switch-sequence { display: flex; align-items: center; justify-content: center; gap: clamp(20px, 5vw, 55px); min-height: 150px; }
.course-switch-sequence strong { color: var(--ink); font-family: var(--serif); font-size: clamp(54px, 8vw, 88px); font-weight: 400; letter-spacing: -0.07em; }
.course-switch-sequence span { color: var(--amber); font-size: 25px; }
.course-counter { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 13px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.course-counter strong { color: var(--mint); font-family: var(--mono); font-size: 13px; font-weight: 500; }
.course-counter button { min-height: 44px; padding: 0 15px; border: 1px solid var(--line-strong); border-radius: 3px; color: var(--ink); background: rgba(255,255,255,0.035); font-size: 11px; }
.course-counter button:hover { border-color: var(--mint); background: rgba(154,216,188,0.08); }
.course-beat-row, .course-loop-sequence { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 6px; margin: 27px 0 20px; }
.course-beat-row > div, .course-loop-sequence > div { display: grid; place-items: center; min-height: 98px; border: 1px solid var(--line-strong); background: rgba(255,255,255,0.025); }
.course-beat-row small, .course-loop-sequence small { color: var(--faint); font-family: var(--mono); font-size: 9px; }
.course-beat-row strong { color: var(--amber); font-size: 37px; font-weight: 400; }
.course-loop-sequence strong { color: var(--ink); font-family: var(--serif); font-size: 29px; font-weight: 400; }
.course-count-voice { margin: 0; color: var(--mint); font-family: var(--serif); font-size: 23px; text-align: center; }
.course-routine-list { display: grid; gap: 0; margin-top: 19px; border-top: 1px solid var(--line-strong); }
.course-routine-list > div { display: grid; grid-template-columns: 54px 1fr; align-items: center; min-height: 55px; border-bottom: 1px solid var(--line); }
.course-routine-list strong { color: var(--amber); font-family: var(--mono); font-size: 11px; }
.course-routine-list span { color: var(--ink); font-size: 12px; }
.course-next-roadmap { margin-top: 23px; }
.course-next-roadmap > span { color: var(--mint); font-family: var(--mono); font-size: 9px; letter-spacing: 0.1em; }
.course-next-roadmap ul { display: grid; gap: 6px; margin: 9px 0 0; padding-left: 18px; color: var(--muted); font-size: 11px; }
.course-lesson-actions { display: grid; grid-template-columns: minmax(180px, 0.65fr) minmax(230px, 1fr); gap: 8px; margin-top: 22px; }
.course-tool-button, .course-complete-button { border-radius: 3px; font-size: 12px; transition: 150ms ease; }
.course-tool-button { min-height: 48px; padding: 0 18px; border: 1px solid var(--line-strong); color: var(--muted); background: transparent; }
.course-tool-button:hover { border-color: var(--amber); color: var(--ink); background: rgba(239,180,108,0.055); }
.course-complete-button { min-height: 44px; padding: 0 20px; border: 1px solid var(--mint); color: #101715; background: var(--mint); font-weight: 700; }
.course-complete-button:hover:not(:disabled) { background: #b4e8d0; transform: translateY(-1px); }
.course-complete-button:disabled { cursor: default; border-color: rgba(154,216,188,0.35); color: var(--mint); background: rgba(154,216,188,0.08); }
.course-complete-button span { margin-left: 8px; }
.course-feedback { min-height: 17px; margin: 9px 0 0; color: var(--faint); font-size: 10px; text-align: right; }

@media (max-width: 1000px) {
  .course-layout { grid-template-columns: 1fr; }
  .course-step-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .course-workspace { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 650px) {
  body[data-active-view="course"] .global-search { display: none; }
  body[data-active-view="course"] .topbar { justify-content: flex-start; }
  body[data-active-view="course"] .content-wrap { padding-top: 20px; }
  body[data-active-view="course"] .view-heading { margin-bottom: 13px; }
  body[data-active-view="course"] .view-heading .eyebrow { margin-bottom: 5px; }
  body[data-active-view="course"] .view-heading h2 { font-size: 31px; }
  body[data-active-view="course"] .view-heading > p { margin-top: 7px; font-size: 11px; line-height: 1.55; }
  .course-overview { grid-template-columns: 1fr; gap: 13px; padding: 13px 0 17px; }
  .course-overview-copy strong { font-size: 27px; }
  .course-overview-copy p { margin-top: 5px; }
  .course-progress-block { grid-template-columns: 1fr auto; }
  .course-layout { grid-template-columns: minmax(0, 1fr); margin-top: 12px; }
  .course-lesson-panel { order: 1; padding: 20px 16px; }
  .course-step-panel { order: 2; overflow: hidden; padding: 14px 0 10px; }
  .course-step-heading { margin: 0 14px; padding-right: 0; padding-left: 0; }
  .course-step-list { display: flex; overflow-x: auto; gap: 5px; padding: 8px 14px 2px; scrollbar-width: none; scroll-snap-type: x proximity; }
  .course-step-list::-webkit-scrollbar { display: none; }
  .course-step-button { flex: 0 0 210px; min-width: 210px; scroll-snap-align: start; }
  .course-lesson-head { gap: 12px; }
  .course-lesson-head h3 { font-size: 31px; }
  .course-minutes { padding: 6px 7px; }
  .course-lesson-why { margin-bottom: 18px; }
  .course-workspace { grid-template-columns: minmax(0, 1fr); }
  .course-practice-area { padding: 22px 4px; border-top: 1px solid var(--line); }
  .course-instructions { padding: 20px 0 22px; border-right: 0; }
  .course-tuning-row { gap: 3px; }
  .course-tuning-row > div { min-height: 67px; }
  .course-tuning-row strong { font-size: 24px; }
  .course-diagram { width: min(100%, 300px); }
  .course-switch-sequence { min-height: 120px; }
  .course-beat-row > div, .course-loop-sequence > div { min-height: 78px; }
  .course-loop-sequence strong { font-size: 24px; }
  .course-counter { align-items: stretch; flex-direction: column; }
  .course-lesson-actions { grid-template-columns: 1fr; }
  .course-tool-button, .course-complete-button { width: 100%; min-height: 50px; }
  .course-feedback { text-align: left; }
}