:root {
  --bg: #0c0b0f;
  --bg2: #141318;
  --bg3: #1c1b22;
  --text: #e8e6f0;
  --text2: #9d9aab;
  --text3: #6b687a;
  --border: rgba(255,255,255,0.06);
  --accent: #f59e0b;

  --bb: #1a6b4a;
  --bb-bg: rgba(26,107,74,0.25);
  --bb-text: #6ee7a0;
  --bb-border: rgba(74,222,128,0.35);
  --bb-scale: rgba(74,222,128,0.85);

  --eb: #6d28d9;
  --eb-bg: rgba(109,40,217,0.25);
  --eb-text: #c4b5fd;
  --eb-border: rgba(167,139,250,0.35);
  --eb-scale: rgba(167,139,250,0.85);

  --ab: #c2410c;
  --ab-bg: rgba(194,65,12,0.25);
  --ab-text: #fdba74;
  --ab-border: rgba(251,146,60,0.35);
  --ab-scale: rgba(251,146,60,0.85);

  --dom: #1d4ed8;
  --dom-bg: rgba(29,78,216,0.25);
  --dom-text: #93c5fd;
  --dom-border: rgba(96,165,250,0.35);
  --dom-scale: rgba(96,165,250,0.85);

  --d7: #b45309;
  --d7-bg: rgba(180,83,9,0.25);
  --d7-text: #fcd34d;
  --d7-border: rgba(251,191,36,0.35);
  --d7-scale: rgba(251,191,36,0.85);

  --g7: #0f766e;
  --g7-bg: rgba(15,118,110,0.25);
  --g7-text: #7df4e0;
  --g7-border: rgba(94,234,212,0.35);
  --g7-scale: rgba(94,234,212,0.85);

  --c7: #4338ca;
  --c7-bg: rgba(67,56,202,0.25);
  --c7-text: #a5b4fc;
  --c7-border: rgba(129,140,248,0.35);
  --c7-scale: rgba(129,140,248,0.85);

  --f7: #0369a1;
  --f7-bg: rgba(3,105,161,0.25);
  --f7-text: #7dd3fc;
  --f7-border: rgba(56,189,248,0.35);
  --f7-scale: rgba(56,189,248,0.85);

  --blues: #be185d;
  --blues-bg: rgba(190,24,93,0.25);
  --blues-text: #f9a8d4;
  --blues-border: rgba(244,114,182,0.35);
  --blues-scale: rgba(244,114,182,0.9);

  --end-bg: rgba(255,255,255,0.06);
  --end-text: #8b879e;
  --end-border: rgba(255,255,255,0.1);
  --end-scale: #8b879e;

  /* Ornithology colors */
  --gmaj: #15803d;
  --gmaj-bg: rgba(21,128,61,0.25);
  --gmaj-text: #6ee7a0;
  --gmaj-border: rgba(74,222,128,0.35);
  --gmaj-scale: rgba(74,222,128,0.85);

  --fmaj: #7c3aed;
  --fmaj-bg: rgba(124,58,237,0.25);
  --fmaj-text: #d4c6ff;
  --fmaj-border: rgba(196,181,253,0.35);
  --fmaj-scale: rgba(196,181,253,0.85);

  --ebmaj: #2563eb;
  --ebmaj-bg: rgba(37,99,235,0.25);
  --ebmaj-text: #a5d0fe;
  --ebmaj-border: rgba(147,197,253,0.35);
  --ebmaj-scale: rgba(147,197,253,0.85);

  --eb7: #ea580c;
  --eb7-bg: rgba(234,88,12,0.25);
  --eb7-text: #fdcb8e;
  --eb7-border: rgba(253,186,116,0.35);
  --eb7-scale: rgba(253,186,116,0.85);

  --gmin: #0d9488;
  --gmin-bg: rgba(13,148,136,0.25);
  --gmin-text: #7df4e0;
  --gmin-border: rgba(94,234,212,0.35);
  --gmin-scale: rgba(94,234,212,0.85);

  --e7: #e11d48;
  --e7-bg: rgba(225,29,72,0.25);
  --e7-text: #fdb8c0;
  --e7-border: rgba(253,164,175,0.35);
  --e7-scale: rgba(253,164,175,0.85);

  --gblues: #a21caf;
  --gblues-bg: rgba(162,28,175,0.25);
  --gblues-text: #f0abfc;
  --gblues-border: rgba(232,121,249,0.35);
  --gblues-scale: rgba(232,121,249,0.9);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Noise overlay */
.noise {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 40px 24px 80px;
  position: relative;
  z-index: 1;
}

/* ── Navigation ── */
.app-nav {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.app-logo {
  font-family: 'Playfair Display', serif;
  font-weight: 900;
  font-size: 20px;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: -0.5px;
}

.app-nav-sep {
  color: var(--text3);
  font-size: 14px;
}

.app-nav-title {
  font-size: 14px;
  color: var(--text2);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text3);
  text-decoration: none;
  font-size: 13px;
  transition: color 0.2s;
  cursor: pointer;
}

.back-link:hover { color: var(--text); }

/* ── Home / Song list ── */
.home-header {
  margin-bottom: 48px;
  text-align: center;
}

.home-header h1 {
  font-family: 'Playfair Display', serif;
  font-weight: 900;
  font-size: 56px;
  letter-spacing: -2px;
  line-height: 1.1;
  margin-bottom: 12px;
  background: linear-gradient(135deg, #e8e6f0 0%, #f59e0b 50%, #fb923c 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.home-header .tagline {
  font-size: 18px;
  color: var(--text2);
  font-weight: 400;
  max-width: 520px;
  margin: 0 auto 20px;
  line-height: 1.5;
}

.home-header .instruments {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.instrument-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  background: var(--bg3);
  color: var(--text2);
  border: 1px solid var(--border);
}

.song-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
}

.song-card {
  display: block;
  text-decoration: none;
  padding: 24px;
  border-radius: 14px;
  background: var(--bg2);
  border: 1px solid var(--border);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
  cursor: pointer;
}

.song-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  border-color: rgba(245,158,11,0.3);
}

.song-card .song-title {
  font-family: 'Playfair Display', serif;
  font-weight: 800;
  font-size: 24px;
  color: var(--text);
  margin-bottom: 4px;
}

.song-card .song-composer {
  font-size: 14px;
  color: var(--text2);
  margin-bottom: 12px;
}

.song-card .song-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.song-card .song-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 500;
  padding: 3px 8px;
  border-radius: 12px;
  background: var(--bg3);
  color: var(--text3);
  border: 1px solid var(--border);
}

/* ── Song page header ── */
header {
  margin-bottom: 48px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

header h1 {
  font-family: 'Playfair Display', serif;
  font-weight: 900;
  font-size: 48px;
  letter-spacing: -1px;
  line-height: 1.1;
  margin-bottom: 8px;
  background: linear-gradient(135deg, #e8e6f0 0%, #f59e0b 50%, #fb923c 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

header .subtitle {
  font-size: 16px;
  color: var(--text2);
  font-weight: 400;
  margin-bottom: 16px;
}

header .meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.meta-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  background: var(--bg3);
  color: var(--text2);
  border: 1px solid var(--border);
}

/* ── Legend ── */
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
  padding: 16px;
  background: var(--bg2);
  border-radius: 12px;
  border: 1px solid var(--border);
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text2);
}

.legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  flex-shrink: 0;
}

/* ── Tab bar ── */
.tab-bar {
  display: flex;
  gap: 4px;
  margin-bottom: 24px;
  background: var(--bg2);
  border-radius: 10px;
  padding: 4px;
  border: 1px solid var(--border);
}

.tab-btn {
  flex: 1;
  padding: 10px 16px;
  border: none;
  background: transparent;
  color: var(--text3);
  font-family: 'DM Sans', sans-serif;
  font-size: 13px;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}

.tab-btn:hover { color: var(--text2); background: rgba(255,255,255,0.03); }
.tab-btn.active { background: var(--bg3); color: var(--text); box-shadow: 0 2px 8px rgba(0,0,0,0.2); }

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ── Sections ── */
.section { margin-bottom: 32px; }

.section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  padding: 8px 0;
}

.section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent);
}

.section-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}

.section-line {
  flex: 1;
  height: 1px;
  background: var(--border);
}

.melody-note {
  font-size: 13px;
  color: var(--text3);
  font-style: italic;
  margin-bottom: 12px;
  padding-left: 4px;
}

/* ── Bar grid ── */
.bar-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px;
  margin-bottom: 6px;
}

.bar {
  padding: 10px 12px;
  border-radius: 8px;
  min-height: 80px;
  position: relative;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  cursor: default;
}

.bar:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.bar-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  font-weight: 600;
  opacity: 0.5;
  position: absolute;
  top: 6px;
  left: 10px;
}

.bar-chord {
  font-family: 'DM Sans', sans-serif;
  font-size: 18px;
  font-weight: 700;
  margin: 16px 0 4px;
}

.bar-scale {
  font-size: 12px;
  font-weight: 500;
  line-height: 1.3;
}

.bar-func {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  margin-top: 3px;
  opacity: 0.6;
}

/* Color classes for bars */
.bar.bb { background: var(--bb-bg); border: 1px solid var(--bb-border); }
.bar.bb .bar-num, .bar.bb .bar-func { color: var(--bb-text); }
.bar.bb .bar-chord { color: var(--bb-text); }
.bar.bb .bar-scale { color: var(--bb-scale); }

.bar.eb { background: var(--eb-bg); border: 1px solid var(--eb-border); }
.bar.eb .bar-num, .bar.eb .bar-func { color: var(--eb-text); }
.bar.eb .bar-chord { color: var(--eb-text); }
.bar.eb .bar-scale { color: var(--eb-scale); }

.bar.ab { background: var(--ab-bg); border: 1px solid var(--ab-border); }
.bar.ab .bar-num, .bar.ab .bar-func { color: var(--ab-text); }
.bar.ab .bar-chord { color: var(--ab-text); }
.bar.ab .bar-scale { color: var(--ab-scale); }

.bar.dom { background: var(--dom-bg); border: 1px solid var(--dom-border); }
.bar.dom .bar-num, .bar.dom .bar-func { color: var(--dom-text); }
.bar.dom .bar-chord { color: var(--dom-text); }
.bar.dom .bar-scale { color: var(--dom-scale); }

.bar.d7 { background: var(--d7-bg); border: 1px solid var(--d7-border); }
.bar.d7 .bar-num, .bar.d7 .bar-func { color: var(--d7-text); }
.bar.d7 .bar-chord { color: var(--d7-text); }
.bar.d7 .bar-scale { color: var(--d7-scale); }

.bar.g7 { background: var(--g7-bg); border: 1px solid var(--g7-border); }
.bar.g7 .bar-num, .bar.g7 .bar-func { color: var(--g7-text); }
.bar.g7 .bar-chord { color: var(--g7-text); }
.bar.g7 .bar-scale { color: var(--g7-scale); }

.bar.c7 { background: var(--c7-bg); border: 1px solid var(--c7-border); }
.bar.c7 .bar-num, .bar.c7 .bar-func { color: var(--c7-text); }
.bar.c7 .bar-chord { color: var(--c7-text); }
.bar.c7 .bar-scale { color: var(--c7-scale); }

.bar.f7 { background: var(--f7-bg); border: 1px solid var(--f7-border); }
.bar.f7 .bar-num, .bar.f7 .bar-func { color: var(--f7-text); }
.bar.f7 .bar-chord { color: var(--f7-text); }
.bar.f7 .bar-scale { color: var(--f7-scale); }

.bar.blues { background: var(--blues-bg); border: 1px solid var(--blues-border); }
.bar.blues .bar-num, .bar.blues .bar-func { color: var(--blues-text); }
.bar.blues .bar-chord { color: var(--blues-text); }
.bar.blues .bar-scale { color: var(--blues-scale); }

.bar.end { background: var(--end-bg); border: 1px solid var(--end-border); }
.bar.end .bar-num, .bar.end .bar-func { color: var(--end-text); }
.bar.end .bar-chord { color: var(--end-text); }
.bar.end .bar-scale { color: var(--end-scale); }

/* Ornithology bar colors */
.bar.gmaj { background: var(--gmaj-bg); border: 1px solid var(--gmaj-border); }
.bar.gmaj .bar-num, .bar.gmaj .bar-func { color: var(--gmaj-text); }
.bar.gmaj .bar-chord { color: var(--gmaj-text); }
.bar.gmaj .bar-scale { color: var(--gmaj-scale); }

.bar.fmaj { background: var(--fmaj-bg); border: 1px solid var(--fmaj-border); }
.bar.fmaj .bar-num, .bar.fmaj .bar-func { color: var(--fmaj-text); }
.bar.fmaj .bar-chord { color: var(--fmaj-text); }
.bar.fmaj .bar-scale { color: var(--fmaj-scale); }

.bar.ebmaj { background: var(--ebmaj-bg); border: 1px solid var(--ebmaj-border); }
.bar.ebmaj .bar-num, .bar.ebmaj .bar-func { color: var(--ebmaj-text); }
.bar.ebmaj .bar-chord { color: var(--ebmaj-text); }
.bar.ebmaj .bar-scale { color: var(--ebmaj-scale); }

.bar.eb7 { background: var(--eb7-bg); border: 1px solid var(--eb7-border); }
.bar.eb7 .bar-num, .bar.eb7 .bar-func { color: var(--eb7-text); }
.bar.eb7 .bar-chord { color: var(--eb7-text); }
.bar.eb7 .bar-scale { color: var(--eb7-scale); }

.bar.gmin { background: var(--gmin-bg); border: 1px solid var(--gmin-border); }
.bar.gmin .bar-num, .bar.gmin .bar-func { color: var(--gmin-text); }
.bar.gmin .bar-chord { color: var(--gmin-text); }
.bar.gmin .bar-scale { color: var(--gmin-scale); }

.bar.e7 { background: var(--e7-bg); border: 1px solid var(--e7-border); }
.bar.e7 .bar-num, .bar.e7 .bar-func { color: var(--e7-text); }
.bar.e7 .bar-chord { color: var(--e7-text); }
.bar.e7 .bar-scale { color: var(--e7-scale); }

.bar.gblues { background: var(--gblues-bg); border: 1px solid var(--gblues-border); }
.bar.gblues .bar-num, .bar.gblues .bar-func { color: var(--gblues-text); }
.bar.gblues .bar-chord { color: var(--gblues-text); }
.bar.gblues .bar-scale { color: var(--gblues-scale); }

.alt-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--blues-text);
  margin: 16px 0 8px;
  opacity: 0.7;
}

/* ── Highlight box ── */
.highlight-box {
  margin: 20px 0;
  padding: 16px 20px;
  border-radius: 10px;
  background: rgba(245,158,11,0.06);
  border: 1px solid rgba(245,158,11,0.15);
}

.highlight-box p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text2);
}

.highlight-box strong {
  color: var(--accent);
}

/* ── Note cards ── */
.notes-section h2 {
  font-family: 'Playfair Display', serif;
  font-weight: 800;
  font-size: 28px;
  margin-bottom: 24px;
  color: var(--text);
}

.note-card {
  padding: 20px 24px;
  border-radius: 12px;
  background: var(--bg2);
  border: 1px solid var(--border);
  margin-bottom: 12px;
}

.note-card h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.note-card h3 .icon {
  width: 20px;
  height: 20px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  flex-shrink: 0;
}

.note-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text2);
}

.note-card p + p { margin-top: 8px; }

.note-card p strong { color: var(--text); font-weight: 600; }

.note-card code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  background: rgba(245,158,11,0.1);
  color: var(--accent);
  padding: 2px 6px;
  border-radius: 4px;
}

/* ── Scale reference ── */
.scale-ref h2 {
  font-family: 'Playfair Display', serif;
  font-weight: 800;
  font-size: 28px;
  margin-bottom: 24px;
  color: var(--text);
}

.scale-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 10px;
}

.scale-card {
  padding: 16px 20px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg2);
}

.scale-card .scale-name { font-size: 14px; font-weight: 700; margin-bottom: 6px; }
.scale-card .scale-notes { font-family: 'JetBrains Mono', monospace; font-size: 14px; font-weight: 500; letter-spacing: 1px; }
.scale-card .scale-desc { font-size: 12px; color: var(--text3); margin-top: 4px; }

.scale-card.s-bb { border-color: var(--bb-border); }
.scale-card.s-bb .scale-name { color: var(--bb-text); }
.scale-card.s-bb .scale-notes { color: var(--bb-scale); }

.scale-card.s-eb { border-color: var(--eb-border); }
.scale-card.s-eb .scale-name { color: var(--eb-text); }
.scale-card.s-eb .scale-notes { color: var(--eb-scale); }

.scale-card.s-ab { border-color: var(--ab-border); }
.scale-card.s-ab .scale-name { color: var(--ab-text); }
.scale-card.s-ab .scale-notes { color: var(--ab-scale); }

.scale-card.s-d7 { border-color: var(--d7-border); }
.scale-card.s-d7 .scale-name { color: var(--d7-text); }
.scale-card.s-d7 .scale-notes { color: var(--d7-scale); }

.scale-card.s-g7 { border-color: var(--g7-border); }
.scale-card.s-g7 .scale-name { color: var(--g7-text); }
.scale-card.s-g7 .scale-notes { color: var(--g7-scale); }

.scale-card.s-c7 { border-color: var(--c7-border); }
.scale-card.s-c7 .scale-name { color: var(--c7-text); }
.scale-card.s-c7 .scale-notes { color: var(--c7-scale); }

.scale-card.s-f7 { border-color: var(--f7-border); }
.scale-card.s-f7 .scale-name { color: var(--f7-text); }
.scale-card.s-f7 .scale-notes { color: var(--f7-scale); }

.scale-card.s-blues { border-color: var(--blues-border); }
.scale-card.s-blues .scale-name { color: var(--blues-text); }
.scale-card.s-blues .scale-notes { color: var(--blues-scale); }

/* Ornithology scale card colors */
.scale-card.s-gmaj { border-color: var(--gmaj-border); }
.scale-card.s-gmaj .scale-name { color: var(--gmaj-text); }
.scale-card.s-gmaj .scale-notes { color: var(--gmaj-scale); }

.scale-card.s-fmaj { border-color: var(--fmaj-border); }
.scale-card.s-fmaj .scale-name { color: var(--fmaj-text); }
.scale-card.s-fmaj .scale-notes { color: var(--fmaj-scale); }

.scale-card.s-ebmaj { border-color: var(--ebmaj-border); }
.scale-card.s-ebmaj .scale-name { color: var(--ebmaj-text); }
.scale-card.s-ebmaj .scale-notes { color: var(--ebmaj-scale); }

.scale-card.s-eb7 { border-color: var(--eb7-border); }
.scale-card.s-eb7 .scale-name { color: var(--eb7-text); }
.scale-card.s-eb7 .scale-notes { color: var(--eb7-scale); }

.scale-card.s-gmin { border-color: var(--gmin-border); }
.scale-card.s-gmin .scale-name { color: var(--gmin-text); }
.scale-card.s-gmin .scale-notes { color: var(--gmin-scale); }

.scale-card.s-e7 { border-color: var(--e7-border); }
.scale-card.s-e7 .scale-name { color: var(--e7-text); }
.scale-card.s-e7 .scale-notes { color: var(--e7-scale); }

.scale-card.s-gblues { border-color: var(--gblues-border); }
.scale-card.s-gblues .scale-name { color: var(--gblues-text); }
.scale-card.s-gblues .scale-notes { color: var(--gblues-scale); }

/* ── Variant toggle ── */
.variant-toggle {
  display: flex;
  gap: 4px;
  margin: 12px 0 8px;
  background: var(--bg2);
  border-radius: 8px;
  padding: 3px;
  border: 1px solid var(--border);
  max-width: 400px;
}

.variant-btn {
  flex: 1;
  padding: 6px 12px;
  border: none;
  background: transparent;
  color: var(--text3);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
}

.variant-btn:hover { color: var(--text2); background: rgba(255,255,255,0.03); }
.variant-btn.active { background: var(--bg3); color: var(--accent); box-shadow: 0 1px 4px rgba(0,0,0,0.2); }

.variant-row { display: none; }
.variant-row.active { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 6px; margin-bottom: 6px; }

/* ── Footer ── */
.footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text3);
  font-size: 12px;
  line-height: 1.6;
}

/* ── Responsive ── */
@media (max-width: 600px) {
  .container { padding: 20px 16px 60px; }
  .home-header h1 { font-size: 36px; }
  header h1 { font-size: 32px; }
  .bar-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .variant-row.active { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .variant-toggle { max-width: 100%; }
  .tab-bar { flex-wrap: wrap; }
  .tab-btn { font-size: 12px; padding: 8px 10px; }
  .song-list { grid-template-columns: 1fr; }
  .scale-grid { grid-template-columns: 1fr; }
  .note-card { padding: 16px; }
  .legend { padding: 12px; gap: 6px; }
}

@media (min-width: 601px) and (max-width: 768px) {
  .home-header h1 { font-size: 44px; }
  .bar-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}