:root {
  --bg: #ffffff;
  --surface: #f5f6f8;
  --card: #ffffff;
  --accent: #d94060;
  --accent2: #c47a10;
  --accent3: #1a9a6a;
  --text: #222;
  --muted: #777;
  --border: #ddd;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Helvetica Neue', Arial, sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; }
header { text-align: center; padding: 1.5rem 1rem 0.8rem; }
header h1 { font-size: 1.8rem; letter-spacing: 0.1em; }
header h1 a { text-decoration: none; color: var(--text); }
header h1 span { color: var(--accent); }
header p { color: var(--muted); margin-top: 0.2rem; font-size: 0.9rem; }

/* Nav */
.page-nav {
  display: flex; flex-wrap: wrap; gap: 0; justify-content: center;
  background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
}
.page-nav a {
  color: var(--muted); text-decoration: none; border-bottom: 3px solid transparent;
  padding: 0.65rem 1rem; font-size: 0.85rem; transition: all 0.15s;
}
.page-nav a.active { color: var(--accent); border-bottom-color: var(--accent); }
.page-nav a:hover { color: var(--text); }

.controls {
  display: flex; flex-wrap: wrap; gap: 0.5rem; justify-content: center;
  padding: 0.8rem 1rem; position: sticky; top: 0; background: var(--bg); z-index: 10;
  border-bottom: 1px solid var(--border);
}
.controls label { color: var(--muted); font-size: 0.85rem; margin-right: 0.3rem; align-self: center; }
.controls select, .controls button {
  background: var(--surface); color: var(--text); border: 1px solid var(--border);
  padding: 0.4rem 0.8rem; border-radius: 6px; font-size: 0.95rem; cursor: pointer;
}
.controls button.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.lang-controls {
  display: inline-flex; align-items: center; gap: 0.35rem;
}
.lang-controls select {
  min-width: 110px;
}
.controls-lang-only {
  justify-content: flex-end;
}

main { max-width: 1000px; margin: 0 auto; padding: 1.5rem 1rem 3rem; }
section { margin-bottom: 2.5rem; }
section h2 { font-size: 1.2rem; color: var(--accent2); margin-bottom: 1rem; border-left: 4px solid var(--accent2); padding-left: 0.6rem; }
section h3 { font-size: 1rem; color: var(--accent3); margin: 1.2rem 0 0.6rem; }

/* Diatonic table */
.diatonic-table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
.diatonic-table th, .diatonic-table td { padding: 0.5rem 0.6rem; border: 1px solid var(--border); text-align: center; }
.diatonic-table th { background: var(--surface); color: var(--muted); font-weight: normal; font-size: 0.8rem; }
.diatonic-table td { background: var(--card); cursor: pointer; transition: background 0.15s; }
.diatonic-table td:hover { background: var(--accent); color: #fff; }
.diatonic-table tr td:first-child { font-weight: bold; color: var(--accent2); cursor: default; background: var(--surface); }
.diatonic-table tr td:first-child:hover { background: var(--surface); color: var(--accent2); }

/* Genre filter */
.genre-filters { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 1rem; justify-content: center; }
.genre-filters button {
  background: var(--surface); color: var(--muted); border: 1px solid var(--border);
  padding: 0.25rem 0.7rem; border-radius: 20px; font-size: 0.8rem; cursor: pointer;
}
.genre-filters button.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.genre-filters button:hover { border-color: var(--accent); }

/* Progressions */
.prog-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1rem; }
.prog-card { background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 1rem; cursor: pointer; transition: border-color 0.15s; box-shadow: 0 1px 3px rgba(0,0,0,0.06); }
.prog-card:hover, .prog-card.selected { border-color: var(--accent); }
.prog-card .prog-name { font-weight: bold; margin-bottom: 0.3rem; }
.prog-card .prog-degrees { color: var(--accent2); font-size: 1.05rem; margin-bottom: 0.3rem; }
.prog-card .prog-chords { font-size: 1.1rem; letter-spacing: 0.05em; }
.prog-card .prog-desc { font-size: 0.8rem; color: #888; margin-top: 0.2rem; }
.prog-card .prog-genre { font-size: 0.75rem; color: var(--muted); margin-top: 0.4rem; }
.prog-diagrams { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.6rem; padding-top: 0.6rem; border-top: 1px solid var(--border); justify-content: center; }
.prog-diagram { text-align: center; }
.prog-diagram-name { font-size: 0.7rem; font-weight: bold; color: var(--accent2); margin-bottom: 0.1rem; }

/* Diagrams */
.diagram-grid { display: flex; flex-wrap: wrap; gap: 1.2rem; justify-content: center; }
.diagram-item { text-align: center; background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 0.8rem 1rem 0.6rem; min-width: 100px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); }
.diagram-item.highlight { border-color: var(--accent); box-shadow: 0 0 8px rgba(217,64,96,0.2); }
.diagram-item .chord-name { font-weight: bold; font-size: 1rem; margin-bottom: 0.4rem; }
svg.chord-svg { display: block; margin: 0 auto; }
.inst-tabs { display: flex; gap: 0.5rem; margin-bottom: 1rem; justify-content: center; }
.inst-tabs button { background: var(--surface); color: var(--text); border: 1px solid var(--border); padding: 0.35rem 1rem; border-radius: 6px; cursor: pointer; font-size: 0.9rem; }
.inst-tabs button.active { background: var(--accent); border-color: var(--accent); }

/* Piano keys */
.piano-roll { display: flex; justify-content: center; margin: 0.8rem 0; gap: 0; position: relative; }
.piano-key {
  width: 38px; height: 120px; border: 1px solid #bbb; border-radius: 0 0 4px 4px;
  display: flex; flex-direction: column; justify-content: flex-end; align-items: center;
  padding-bottom: 6px; font-size: 0.7rem; cursor: pointer; transition: all 0.1s; position: relative;
}
.piano-key.white { background: #f8f8f8; color: #666; }
.piano-key.black { background: #333; color: #ccc; width: 26px; height: 76px; margin: 0 -13px; z-index: 2; border-radius: 0 0 3px 3px; border-color: #222; }
.piano-key.scale-note { background: #c8daf0; color: #234; }
.piano-key.black.scale-note { background: #4a6a9a; color: #fff; }
.piano-key.chord-tone { background: var(--accent); color: #fff; }
.piano-key.black.chord-tone { background: #b83050; color: #fff; }
.piano-key.penta { box-shadow: inset 0 -5px 0 var(--accent3); }
.piano-key.root { box-shadow: inset 0 -5px 0 var(--accent2); }
.piano-key:hover { filter: brightness(0.92); }
.piano-legend { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: center; margin: 0.8rem 0; font-size: 0.8rem; }
.piano-legend span { display: flex; align-items: center; gap: 0.3rem; }
.legend-dot { width: 12px; height: 12px; border-radius: 2px; }

.chord-tone-flow { display: flex; gap: 0.5rem; flex-wrap: wrap; justify-content: center; margin: 1rem 0; }
.ct-step { background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 0.6rem 0.8rem; text-align: center; min-width: 80px; }
.ct-step .ct-chord { font-weight: bold; color: var(--accent2); font-size: 0.95rem; }
.ct-step .ct-notes { color: var(--accent); margin-top: 0.2rem; font-size: 0.9rem; }
.ct-arrow { color: var(--muted); align-self: center; font-size: 1.2rem; }

/* Rhythm Patterns */
.rhythm-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1rem; }
.rhythm-card { background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 1rem; box-shadow: 0 1px 3px rgba(0,0,0,0.06); }
.rhythm-card.playing { border-color: var(--accent3); box-shadow: 0 0 0 2px rgba(26,154,106,0.12); }
.rhythm-card .rhythm-name { font-weight: bold; margin-bottom: 0.4rem; }
.rhythm-card .rhythm-desc { font-size: 0.8rem; color: var(--muted); margin-bottom: 0.6rem; }
.rhythm-topbar {
  display: flex; flex-wrap: wrap; gap: 0.8rem; align-items: center;
  justify-content: center; margin-bottom: 1rem; padding: 0.9rem 1rem;
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
}
.rhythm-topbar label { font-size: 0.85rem; color: var(--muted); }
.rhythm-topbar select, .rhythm-topbar input {
  background: var(--card); color: var(--text); border: 1px solid var(--border);
  padding: 0.35rem 0.6rem; border-radius: 6px; font-size: 0.9rem;
}
.rhythm-topbar input[type=range] { width: 180px; vertical-align: middle; }
.rhythm-bpm-val { display: inline-block; min-width: 2.6rem; text-align: right; color: var(--accent2); font-weight: bold; margin-left: 0.35rem; }
.rhythm-hint { text-align: center; color: var(--muted); font-size: 0.8rem; margin-bottom: 1rem; }
.rhythm-head { display: flex; gap: 0.6rem; justify-content: space-between; align-items: flex-start; margin-bottom: 0.35rem; }
.rhythm-actions { display: flex; gap: 0.45rem; align-items: center; flex-shrink: 0; }
.rhythm-play-btn {
  background: var(--accent3); color: #fff; border: 1px solid var(--accent3);
  border-radius: 999px; padding: 0.35rem 0.8rem; font-size: 0.8rem; cursor: pointer;
}
.rhythm-play-btn:hover { filter: brightness(0.95); }
.rhythm-play-btn.stop {
  background: var(--accent); border-color: var(--accent); color: #fff;
}
.rhythm-stroke-tag {
  background: #eef8f4; color: var(--accent3); border-radius: 999px;
  padding: 0.2rem 0.55rem; font-size: 0.7rem; font-weight: bold;
}
.rhythm-blocks { display: flex; gap: 2px; align-items: flex-end; height: 40px; overflow: hidden; }
.rhythm-block { background: var(--accent); border-radius: 2px; flex: 1; min-width: 0; transition: background 0.15s; }
.rhythm-block.rest { background: #e8e8e8; }
.rhythm-block.tie { background: var(--accent2); }
.rhythm-block.active-step { outline: 2px solid var(--accent3); outline-offset: -1px; filter: brightness(1.08); }
.rhythm-block.active-step.rest { background: #d9eee6; }
.rhythm-block.active-step.tie { background: #d79a3a; }
.beat-markers { display: flex; gap: 2px; margin-top: 2px; }
.beat-marker { flex: 1; min-width: 0; text-align: center; font-size: 0.6rem; color: var(--muted); }

/* Song Structure */
.structure-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1rem; }
.structure-card { background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 1rem; cursor: pointer; transition: border-color 0.15s; box-shadow: 0 1px 3px rgba(0,0,0,0.06); }
.structure-card:hover, .structure-card.selected { border-color: var(--accent3); }
.structure-card .structure-name { font-weight: bold; margin-bottom: 0.3rem; }
.structure-card .structure-genre { font-size: 0.75rem; color: var(--muted); margin-bottom: 0.5rem; }
.structure-flow { display: flex; flex-wrap: wrap; gap: 0.3rem; }
.structure-block { padding: 0.25rem 0.6rem; border-radius: 4px; font-size: 0.8rem; font-weight: bold; }
.sb-intro { background: #d0dff0; color: #2a3a5c; }
.sb-verse { background: #c8ecd8; color: #1a4a2a; }
.sb-prechorus { background: #f0e0c8; color: #5a4020; }
.sb-chorus { background: #f0c8d0; color: #6a2030; }
.sb-bridge { background: #dcc8f0; color: #3a2060; }
.sb-solo { background: #f0e8c0; color: #5a4a10; }
.sb-outro { background: #c0e0e8; color: #1a4050; }
.sb-hook { background: #f0c0d8; color: #5a1030; }
.sb-drop { background: #c0d0f0; color: #1a306a; }
.sb-buildup { background: #d8e8c0; color: #3a4a10; }
.sb-breakdown { background: #e0c8e8; color: #4a2050; }

.structure-detail { margin-top: 1.5rem; background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 1.2rem; display: none; }
.structure-detail.visible { display: block; }
.structure-detail h3 { margin-top: 0; }
.sd-section { margin: 0.8rem 0; padding: 0.6rem; background: var(--surface); border-radius: 6px; }
.sd-section .sd-name { font-weight: bold; font-size: 0.9rem; margin-bottom: 0.2rem; }
.sd-section .sd-bars { color: var(--accent2); font-size: 0.85rem; }
.sd-section .sd-tip { color: var(--muted); font-size: 0.8rem; margin-top: 0.2rem; }

/* Tips */
.tips-list { display: grid; grid-template-columns: 1fr; gap: 1rem; }
.tip-card { background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 1.2rem; box-shadow: 0 1px 3px rgba(0,0,0,0.06); }
.tip-card .tip-num { display: inline-block; background: var(--accent); color: #fff; width: 28px; height: 28px; border-radius: 50%; text-align: center; line-height: 28px; font-weight: bold; font-size: 0.85rem; margin-right: 0.5rem; }
.tip-card .tip-title { font-weight: bold; font-size: 1rem; }
.tip-card .tip-body { margin-top: 0.5rem; color: #444; font-size: 0.9rem; line-height: 1.7; }
.tip-card .tip-example { background: var(--surface); border-radius: 6px; padding: 0.6rem 0.8rem; margin-top: 0.5rem; font-size: 0.85rem; color: var(--accent2); }

/* Melody Maker */
.mm-controls { display: flex; flex-wrap: wrap; gap: 0.6rem; align-items: center; margin-bottom: 1rem; }
.mm-controls select, .mm-controls button, .mm-controls input {
  background: var(--surface); color: var(--text); border: 1px solid var(--border);
  padding: 0.35rem 0.7rem; border-radius: 6px; font-size: 0.85rem; cursor: pointer;
}
.mm-controls button.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.mm-controls button.primary:hover { filter: brightness(0.92); }
.mm-controls label { font-size: 0.8rem; color: var(--muted); }
.mm-phrases { display: flex; flex-direction: column; gap: 0.8rem; }
.mm-phrase { background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 0.8rem; box-shadow: 0 1px 3px rgba(0,0,0,0.06); }
.mm-phrase-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.5rem; }
.mm-phrase-header .mm-chord-label { font-weight: bold; color: var(--accent2); font-size: 1rem; }
.mm-phrase-header button { background: var(--surface); border: 1px solid var(--border); color: var(--text); padding: 0.2rem 0.6rem; border-radius: 4px; font-size: 0.75rem; cursor: pointer; }
.mm-phrase-header button:hover { border-color: var(--accent); }
.mm-grid { display: grid; grid-template-columns: 30px repeat(16, 1fr); gap: 1px; background: var(--border); border: 1px solid var(--border); border-radius: 4px; overflow: hidden; }
.mm-grid-label { background: var(--surface); display: flex; align-items: center; justify-content: center; font-size: 0.6rem; color: var(--muted); padding: 0; }
.mm-grid-cell { height: 18px; background: #fafafa; transition: background 0.1s; cursor: pointer; }
.mm-grid-cell.active { background: var(--accent); border-radius: 3px 0 0 3px; }
.mm-grid-cell.active.end { border-radius: 3px; }
.mm-grid-cell.held { background: #e06878; }
.mm-grid-cell.held.end { border-radius: 0 3px 3px 0; }
.mm-grid-cell.chord-tone-row { background: #f0f4fa; }
.mm-grid-cell.chord-tone-row.active { background: var(--accent); }
.mm-grid-cell.chord-tone-row.held { background: #e06878; }
.mm-grid-cell.playing { outline: 2px solid var(--accent3); outline-offset: -2px; }
.mm-grid-cell:hover { filter: brightness(0.94); }
.mm-note-names { display: grid; grid-template-columns: 30px repeat(16, 1fr); gap: 1px; margin-top: 1px; }
.mm-beat-num { font-size: 0.6rem; color: var(--muted); text-align: center; padding: 2px 0; }
.mm-transport { display: flex; gap: 0.5rem; align-items: center; margin-top: 1rem; justify-content: center; flex-wrap: wrap; }
.mm-transport button { background: var(--surface); border: 1px solid var(--border); color: var(--text); padding: 0.4rem 1rem; border-radius: 6px; font-size: 0.9rem; cursor: pointer; }
.mm-transport button.play-all { background: var(--accent3); color: #fff; border-color: var(--accent3); font-weight: bold; }
.mm-transport button.stop { background: var(--accent); color: #fff; border-color: var(--accent); }
.mm-loop-btn { background: var(--surface); border: 1px solid var(--border); color: var(--text); padding: 0.4rem 1rem; border-radius: 6px; font-size: 0.9rem; cursor: pointer; }
.mm-loop-btn.active { background: var(--accent2); color: #fff; border-color: var(--accent2); }
.mm-style-info { font-size: 0.8rem; color: var(--muted); margin-top: 0.4rem; }
.mm-transport-inline { display: inline-flex; gap: 0.4rem; margin-left: 0.5rem; }
.mm-transport-inline button { background: var(--surface); border: 1px solid var(--border); color: var(--text); padding: 0.3rem 0.7rem; border-radius: 6px; font-size: 0.8rem; cursor: pointer; }
.mm-transport-inline button.play-all { background: var(--accent3); color: #fff; border-color: var(--accent3); }
.mm-transport-inline button.stop { background: var(--accent); color: #fff; border-color: var(--accent); }

/* Metronome / Drum */
.metro-bpm { display: flex; align-items: center; gap: 1rem; justify-content: center; margin: 1.5rem 0; }
.metro-bpm input[type=range] { width: 200px; }
.metro-bpm .bpm-val { font-size: 2rem; font-weight: bold; color: var(--accent2); min-width: 80px; text-align: center; }
.metro-btn {
  display: inline-block; padding: 0.6rem 2rem; border-radius: 8px; font-size: 1rem;
  cursor: pointer; border: 1px solid var(--border); background: var(--surface); color: var(--text); margin: 0 0.3rem;
}
.metro-btn.on { background: var(--accent3); color: #fff; border-color: var(--accent3); }
.metro-btn.stop { background: var(--accent); color: #fff; border-color: var(--accent); }
.metro-center { text-align: center; margin: 1rem 0; }
.metro-flash { width: 16px; height: 16px; border-radius: 50%; background: var(--border); display: inline-block; margin: 0 3px; transition: background 0.05s; vertical-align: middle; }
.metro-flash.beat { background: var(--accent); }
.metro-flash.down { background: var(--accent2); }

.drum-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1rem; margin-top: 1rem; }
.drum-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 8px;
  padding: 1rem; cursor: pointer; box-shadow: 0 1px 3px rgba(0,0,0,0.06); transition: border-color 0.15s;
}
.drum-card:hover, .drum-card.active { border-color: var(--accent3); }
.drum-card .drum-name { font-weight: bold; margin-bottom: 0.2rem; }
.drum-card .drum-sig { font-size: 0.8rem; color: var(--accent2); margin-bottom: 0.3rem; }
.drum-card .drum-desc { font-size: 0.8rem; color: var(--muted); }
.drum-vis { display: flex; gap: 1px; margin-top: 0.6rem; }
.drum-vis-step { flex: 1; height: 8px; border-radius: 1px; background: #eee; }
.drum-vis-step.k { background: var(--accent); }
.drum-vis-step.s { background: var(--accent2); }
.drum-vis-step.h { background: var(--accent3); }
.drum-vis-step.kh { background: linear-gradient(var(--accent), var(--accent3)); }
.drum-vis-step.ks { background: linear-gradient(var(--accent), var(--accent2)); }
.drum-vis-step.sh { background: linear-gradient(var(--accent2), var(--accent3)); }

/* Jam / アドリブ練習 */
.jam-settings {
  display: flex; flex-wrap: wrap; gap: 0.6rem; align-items: center;
  padding: 1rem; background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; margin-bottom: 1.2rem;
}
.jam-settings label { font-size: 0.85rem; color: var(--muted); display: flex; align-items: center; gap: 0.3rem; }
.jam-settings select, .jam-settings input[type=range] {
  background: var(--card); color: var(--text); border: 1px solid var(--border);
  padding: 0.35rem 0.6rem; border-radius: 6px; font-size: 0.9rem;
}
.jam-settings input[type=range] { width: 140px; }
.jam-bpm-val { min-width: 2.2rem; font-weight: bold; color: var(--accent2); text-align: right; }
.jam-play-btn, .jam-stop-btn {
  padding: 0.5rem 1.2rem; border-radius: 8px; font-size: 0.95rem;
  cursor: pointer; border: 1px solid var(--border); font-weight: bold;
}
.jam-play-btn { background: var(--accent3); color: #fff; border-color: var(--accent3); }
.jam-play-btn.active { background: var(--accent2); border-color: var(--accent2); }
.jam-stop-btn { background: var(--accent); color: #fff; border-color: var(--accent); }

.jam-display {
  text-align: center; padding: 1.5rem 1rem; background: var(--card);
  border: 1px solid var(--border); border-radius: 12px; margin-bottom: 1.2rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.jam-chord-now {
  font-size: 3.5rem; font-weight: bold; color: var(--accent);
  letter-spacing: 0.05em; margin-bottom: 0.6rem; line-height: 1.2;
}
.jam-beats { display: flex; gap: 0.8rem; justify-content: center; margin-bottom: 1rem; }
.jam-beat {
  width: 18px; height: 18px; border-radius: 50%; background: var(--border); transition: all 0.08s;
}
.jam-beat.active { background: var(--accent3); transform: scale(1.3); }
.jam-beat.down { background: var(--accent2); }
.jam-flow { display: flex; gap: 0.4rem; justify-content: center; align-items: center; flex-wrap: wrap; }
.jam-flow-chord {
  padding: 0.4rem 0.9rem; border-radius: 6px; font-weight: bold; font-size: 1.05rem;
  background: var(--surface); color: var(--muted); border: 2px solid transparent; transition: all 0.15s;
}
.jam-flow-chord.current { background: var(--accent); color: #fff; border-color: var(--accent); transform: scale(1.08); }
.jam-flow-arrow { color: var(--border); font-size: 0.9rem; }

.jam-scale {
  background: var(--card); border: 1px solid var(--border); border-radius: 10px;
  padding: 1rem 1.2rem;
}
.jam-scale h3 { font-size: 0.95rem; color: var(--accent2); margin-bottom: 0.8rem; border-left: 3px solid var(--accent2); padding-left: 0.5rem; }
.jam-scale-section { margin-bottom: 0.6rem; display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.jam-scale-label { font-size: 0.8rem; color: var(--muted); min-width: 170px; }
.jam-scale-notes { display: flex; gap: 0.3rem; flex-wrap: wrap; }
.jam-note {
  display: inline-block; padding: 0.3rem 0.6rem; border-radius: 5px;
  font-weight: bold; font-size: 0.9rem; text-align: center; min-width: 2rem;
}
.jam-note.penta { background: #d4edda; color: #1a6b2a; }
.jam-note.scale { background: #d0e4f5; color: #1a3d6b; }
.jam-note.ct { background: #f8d7dd; color: #8b1a2b; }
.jam-scale-sub {
  margin: 1rem 0 0.45rem; font-size: 0.82rem; font-weight: 700; color: var(--accent2);
}
.jam-scale-table-wrap {
  overflow-x: auto; margin-bottom: 0.8rem;
}
.jam-scale-table {
  width: 100%; min-width: 460px; border-collapse: collapse; font-size: 0.84rem;
}
.jam-scale-table th, .jam-scale-table td {
  border: 1px solid var(--border); padding: 0.5rem 0.4rem; text-align: center;
}
.jam-scale-table th {
  background: var(--surface); color: var(--muted); white-space: nowrap; font-weight: 700;
}
.jam-scale-table td {
  background: #fff; color: var(--text); font-weight: 600;
}
.jam-scale-table td.is-root {
  box-shadow: inset 0 -4px 0 var(--accent2);
}
.jam-scale-table td.is-penta {
  background: #dff3e5; color: #1a6b2a; font-size: 1rem;
}
.jam-scale-table td.is-chord {
  background: #fbe1e6; color: #8b1a2b; font-size: 1rem;
}
.jam-piano-legend {
  margin-top: 0.2rem;
}
.jam-piano-roll {
  margin-top: 0.6rem;
}
.jam-scale-hint {
  margin-top: 0.55rem; text-align: center; color: var(--muted); font-size: 0.82rem;
}

/* Scale Page */
.scale-mini-meta {
  color: var(--muted); font-size: 0.84rem;
}
.scale-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  padding: 1.1rem 1.15rem 1.2rem; box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}
.scale-head {
  display: flex; justify-content: space-between; align-items: flex-start;
  gap: 0.8rem; flex-wrap: wrap; margin-bottom: 0.9rem;
}
.scale-title {
  font-size: 1.35rem; font-weight: 700; color: var(--text); line-height: 1.25;
}
.scale-formula {
  color: var(--accent2); font-size: 0.92rem; font-weight: 700; margin-top: 0.25rem;
}
.scale-summary {
  color: var(--muted); font-size: 0.84rem; text-align: right;
}
.scale-note-list {
  display: flex; flex-wrap: wrap; gap: 0.45rem; margin-bottom: 0.9rem;
}
.scale-note-chip {
  display: inline-flex; align-items: center; gap: 0.35rem; background: var(--surface);
  border: 1px solid var(--border); border-radius: 999px; padding: 0.34rem 0.7rem;
  color: var(--text); font-size: 0.86rem; font-weight: 600;
}
.scale-note-chip.root {
  background: #fbe1e6; border-color: #efb6c1; color: #8b1a2b;
}
.scale-degree {
  font-size: 0.74rem; color: var(--muted); font-weight: 700;
}
.scale-note-chip.root .scale-degree {
  color: #b33c55;
}
.scale-legend {
  display: flex; gap: 1rem; flex-wrap: wrap; align-items: center;
  margin-bottom: 0.8rem; font-size: 0.82rem; color: var(--muted);
}
.scale-legend span {
  display: inline-flex; align-items: center; gap: 0.35rem;
}
.scale-legend-dot {
  width: 13px; height: 13px; border-radius: 50%; display: inline-block;
}
.scale-legend-dot.root {
  background: var(--accent);
}
.scale-legend-dot.note {
  background: #222;
}
.scale-legend-dot.open {
  background: #fff; border: 2px solid #222;
}
.scale-fretboard-wrap {
  overflow-x: auto; background: #fff; border: 1px solid var(--border);
  border-radius: 12px; padding: 0.6rem 0.75rem;
}
.scale-fretboard {
  display: block; min-width: 680px; height: auto;
}
.scale-hint {
  margin-top: 0.7rem; color: var(--muted); font-size: 0.82rem; text-align: center;
}

/* Blog */
.blog-toc {
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
  padding: 1rem 1.2rem; margin-bottom: 2rem;
}
.blog-toc strong { color: var(--accent2); font-size: 0.9rem; }
.blog-toc ol { margin: 0.6rem 0 0 1.2rem; padding: 0; }
.blog-toc li { margin-bottom: 0.3rem; font-size: 0.9rem; }
.blog-toc a { color: var(--accent); text-decoration: none; }
.blog-toc a:hover { text-decoration: underline; }

.blog-article {
  background: var(--card); border: 1px solid var(--border); border-radius: 10px;
  padding: 1.8rem 1.5rem; margin-bottom: 2rem; box-shadow: 0 1px 4px rgba(0,0,0,0.05);
}
.blog-article h2 {
  font-size: 1.2rem; color: var(--text); margin-bottom: 0.8rem; line-height: 1.5;
  border-left: 4px solid var(--accent); padding-left: 0.6rem;
}
.blog-article h3 { font-size: 1rem; color: var(--accent2); margin: 1.4rem 0 0.5rem; }
.blog-article p { font-size: 0.92rem; line-height: 1.85; color: #333; margin-bottom: 0.8rem; }
.blog-article ul, .blog-article ol { font-size: 0.92rem; line-height: 1.85; color: #333; margin: 0.5rem 0 0.8rem 1.2rem; }
.blog-article li { margin-bottom: 0.3rem; }
.blog-meta { font-size: 0.78rem; color: var(--muted); margin-bottom: 0.5rem; }
.blog-tip {
  background: #f0f8f4; border-left: 3px solid var(--accent3); border-radius: 0 6px 6px 0;
  padding: 0.7rem 1rem; margin-top: 1rem; font-size: 0.85rem; color: #2a5a3a;
}
.blog-tip a { color: var(--accent3); font-weight: bold; }

/* Blog list (index) */
.blog-list {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem; margin-top: 1rem;
}
.blog-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 10px;
  padding: 1.1rem 1.2rem; box-shadow: 0 1px 3px rgba(0,0,0,0.04);
  display: flex; flex-direction: column; transition: transform 0.15s, box-shadow 0.15s;
}
.blog-card:hover { transform: translateY(-2px); box-shadow: 0 4px 10px rgba(0,0,0,0.08); }
.blog-card-cat {
  display: inline-block; font-size: 0.7rem; padding: 0.2rem 0.55rem; border-radius: 20px;
  background: var(--surface); color: var(--accent); font-weight: bold; margin-right: 0.4rem;
}
.blog-card-cat.beginner { background: #fde8ec; color: #c03050; }
.blog-card-cat.chord { background: #e6efff; color: #2a4d8a; }
.blog-card-cat.melody { background: #fff3d4; color: #8a6720; }
.blog-card-cat.technique { background: #e8f5e9; color: #2a6b3a; }
.blog-card-cat.structure { background: #f1e6ff; color: #5a3a8a; }
.blog-card-cat.lyric { background: #ffe6f0; color: #8a2a5a; }
.blog-card-cat.special { background: #e0f4f4; color: #1a6a6a; }
.blog-card-date { font-size: 0.72rem; color: var(--muted); }
.blog-card-title {
  font-size: 0.98rem; font-weight: bold; color: var(--text);
  margin: 0.55rem 0 0.5rem; line-height: 1.45;
}
.blog-card-excerpt {
  font-size: 0.83rem; color: #555; line-height: 1.65;
  margin-bottom: 0.8rem; flex: 1;
}
.blog-card-link {
  font-size: 0.83rem; color: var(--accent); text-decoration: none; font-weight: bold;
  align-self: flex-start;
}
.blog-card-link:hover { text-decoration: underline; }
.blog-card a.blog-card-cover {
  text-decoration: none; color: inherit; display: block;
}

/* Blog article (single page) */
.blog-back {
  display: inline-block; font-size: 0.85rem; color: var(--muted);
  text-decoration: none; margin-bottom: 1rem;
}
.blog-back:hover { color: var(--accent); }
.blog-pager {
  display: flex; justify-content: space-between; gap: 0.8rem; margin-top: 1.5rem;
}
.blog-pager a {
  flex: 1; background: var(--card); border: 1px solid var(--border); border-radius: 8px;
  padding: 0.8rem 1rem; text-decoration: none; color: var(--text);
  font-size: 0.85rem; transition: border-color 0.15s, transform 0.15s;
}
.blog-pager a:hover { border-color: var(--accent); transform: translateY(-1px); }
.blog-pager a.next { text-align: right; }
.blog-pager .pager-label { display: block; font-size: 0.7rem; color: var(--muted); margin-bottom: 0.2rem; }
.blog-pager .pager-title { font-weight: bold; line-height: 1.4; }
.blog-pager .disabled { visibility: hidden; }

/* Phrase Maker */
.ph-settings {
  display: flex; gap: 0.6rem; align-items: center; flex-wrap: wrap;
  margin-bottom: 0.6rem;
}
.ph-settings label {
  display: inline-flex; align-items: center; gap: 0.35rem;
  color: var(--muted); font-size: 0.88rem;
}
.ph-settings select, .ph-settings input[type="range"] {
  background: var(--surface); color: var(--text); border: 1px solid var(--border);
  padding: 0.25rem 0.5rem; border-radius: 6px; font-size: 0.88rem;
}
.ph-btn {
  background: var(--surface); color: var(--text); border: 1px solid var(--border);
  padding: 0.4rem 0.85rem; border-radius: 6px; font-size: 0.88rem; cursor: pointer;
  transition: all 0.15s;
}
.ph-btn:hover { border-color: var(--accent); color: var(--accent); }
.ph-btn-sub { color: var(--muted); font-size: 0.82rem; padding: 0.35rem 0.7rem; }
#phRecord { color: var(--accent); border-color: var(--accent); }
#phRecord:hover { background: var(--accent); color: #fff; }
.ph-status {
  display: inline-block; padding: 0.3rem 0.7rem; border-radius: 4px;
  background: var(--surface); color: var(--muted); font-size: 0.82rem;
  min-width: 120px; text-align: center;
}
.ph-status.recording { background: var(--accent); color: #fff; animation: phPulse 1s infinite; }
@keyframes phPulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.65; } }
.ph-hint {
  color: var(--muted); font-size: 0.82rem; margin-bottom: 0.6rem;
}
.ph-kbd {
  display: inline-block; background: var(--surface); border: 1px solid var(--border);
  border-bottom-width: 2px; border-radius: 4px; padding: 0.05rem 0.4rem;
  font-family: monospace; font-size: 0.78rem; color: var(--text); margin: 0 0.1rem;
}
.ph-roll-wrap {
  background: #fff; border: 1px solid var(--border); border-radius: 8px;
  overflow-x: auto; margin-bottom: 1rem; box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.ph-roll { min-width: 100%; }
.ph-svg { display: block; }
.ph-note {
  fill: var(--accent); stroke: #a82847; stroke-width: 1;
  cursor: move; transition: fill 0.1s;
}
.ph-note:hover { fill: var(--accent2); }
.ph-note.selected { fill: var(--accent2); stroke: #8a5000; stroke-width: 1.5; }
.ph-save {
  display: flex; gap: 0.5rem; align-items: center; margin-bottom: 0.5rem;
}
.ph-save input {
  flex: 1; background: var(--surface); color: var(--text);
  border: 1px solid var(--border); padding: 0.45rem 0.7rem;
  border-radius: 6px; font-size: 0.92rem;
}
.ph-save input:focus { outline: none; border-color: var(--accent); }
.ph-list { display: grid; gap: 0.5rem; }
.ph-card {
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
  background: var(--card); border: 1px solid var(--border); border-radius: 8px;
  padding: 0.7rem 1rem;
}
.ph-card.current { border-color: var(--accent); background: #fdf6f8; }
.ph-card-name { font-weight: 600; margin-bottom: 0.15rem; }
.ph-card-meta { color: var(--muted); font-size: 0.78rem; }
.ph-card-actions { display: flex; gap: 0.3rem; flex-shrink: 0; }
.ph-card-actions button {
  background: var(--surface); color: var(--muted); border: 1px solid var(--border);
  padding: 0.3rem 0.6rem; border-radius: 5px; font-size: 0.8rem; cursor: pointer;
}
.ph-card-actions button:hover { color: var(--accent); border-color: var(--accent); }

.piano-grid {
  display: grid; gap: 0.5rem;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  margin-bottom: 0.8rem;
}
.piano-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 6px;
  padding: 0.5rem 0.55rem; box-shadow: 0 1px 2px rgba(0,0,0,0.05);
  cursor: pointer; transition: border-color 0.15s, transform 0.05s;
  display: flex; flex-direction: column; gap: 0.2rem;
}
.piano-card:hover { border-color: var(--accent); }
.piano-card:active { transform: scale(0.99); }
.piano-card-head { display: flex; justify-content: space-between; align-items: baseline; gap: 0.4rem; }
.piano-card-name { font-size: 1.1rem; font-weight: 700; color: var(--text); letter-spacing: 0.02em; }
.piano-card-inv { font-size: 0.65rem; color: var(--muted); white-space: nowrap; }
.piano-card-solfege { font-size: 0.88rem; color: var(--accent); font-weight: 600; letter-spacing: 0.03em; }
.piano-card-notes { font-size: 0.72rem; color: var(--muted); letter-spacing: 0.04em; }
.piano-card-keys { margin-top: 0.15rem; }
.piano-keys { width: 100%; height: auto; display: block; }
.piano-legend-item { display: inline-flex; align-items: center; gap: 0.3rem; }
.piano-legend-pill {
  display: inline-block; padding: 0.15rem 0.55rem; border-radius: 999px;
  font-size: 0.78rem; font-weight: 600; border: 1px solid var(--border);
  background: var(--surface); color: var(--muted);
}
.piano-legend-note { color: var(--muted); font-size: 0.8rem; }
.piano-tips { padding-left: 1.2rem; color: #444; font-size: 0.9rem; line-height: 1.7; }
.piano-tips li { margin-bottom: 0.4rem; }

@media print {
  @page { size: A4; margin: 8mm; }
  body { background: #fff; }
  * { -webkit-print-color-adjust: exact !important; print-color-adjust: exact !important; }
  header, .page-nav, .controls, .piano-tips, #pianoTipsHeading,
  .piano-legend, #pianoLead { display: none !important; }
  main { padding: 0; }
  section { margin-bottom: 0.4rem; page-break-inside: avoid; }
  section h2, section h3 {
    font-size: 0.95rem; margin: 0.3rem 0 0.3rem; padding-left: 0.4rem;
    border-left-width: 3px;
  }
  .piano-grid {
    grid-template-columns: repeat(6, 1fr);
    gap: 0.25rem; margin-bottom: 0.4rem;
  }
  .piano-card {
    padding: 0.3rem 0.35rem; gap: 0.1rem; border-radius: 4px;
    box-shadow: none; border-color: #999;
    page-break-inside: avoid; break-inside: avoid;
  }
  .piano-card-name { font-size: 0.9rem; }
  .piano-card-inv { font-size: 0.55rem; }
  .piano-card-solfege { font-size: 0.72rem; color: #000; }
  .piano-card-notes { font-size: 0.6rem; }
  .piano-card:hover { border-color: #999; }
}

@media (max-width: 600px) {
  .diatonic-table { font-size: 0.8rem; }
  .diatonic-table th, .diatonic-table td { padding: 0.35rem 0.25rem; }
  .prog-grid, .rhythm-grid, .structure-grid, .drum-grid { grid-template-columns: 1fr; }
  .piano-key { width: 28px; height: 90px; font-size: 0.6rem; }
  .piano-key.black { width: 20px; height: 56px; margin: 0 -10px; }
  .piano-grid { grid-template-columns: repeat(2, 1fr); gap: 0.4rem; }
  .piano-card { padding: 0.4rem 0.5rem; }
  .piano-card-name { font-size: 1rem; }
  .piano-card-solfege { font-size: 0.82rem; }
  .piano-card-notes { font-size: 0.68rem; }
  .page-nav a { padding: 0.5rem 0.5rem; font-size: 0.75rem; }
  .jam-scale-table { min-width: 420px; font-size: 0.78rem; }
  .jam-scale-table th, .jam-scale-table td { padding: 0.4rem 0.3rem; }
  .jam-scale-label { min-width: 140px; }
  .scale-title { font-size: 1.15rem; }
  .scale-summary { text-align: left; }
  .scale-fretboard { min-width: 620px; }
}