/* ═══════════════════════════════════════════════════════════════════════════
   Workbook theme — light scholastic / young-learner reference aesthetic
   Staff-paper background, soft pastels, readable type. Experimental branch skin.
   Swap body class + this file vs academic.css on main.
   ═══════════════════════════════════════════════════════════════════════════ */

body.theme-workbook {
  --paper: #faf8f4;
  --paper-white: #fffefb;
  --paper-blue: #eef4fb;
  --paper-green: #eef6f0;
  --ink: #3d4f62;
  --ink-light: #5a6e82;
  --ink-muted: #7a8e9e;
  --staff-line: rgba(61, 79, 98, 0.1);

  --bg: var(--paper);
  --bg2: var(--paper-white);
  --bg3: var(--paper-blue);
  --bg4: #e8e4dc;
  --border: #c8d0d8;
  --border2: #a8b4c0;
  --text: var(--ink);
  --text2: var(--ink-light);
  --text3: var(--ink-muted);
  --tab-link: #6a7e92;
  --tab-link-hover: var(--ink);
  --tab-studios: #3a8a78;
  --tab-studios-hover: #2a7060;
  --gold: #4a7eb8;
  --gold2: #3a68a0;
  --accent-light: rgba(74, 126, 184, 0.12);

  --wb-blue: #4a7eb8;
  --wb-subtitle: #2a6098;
  --wb-green: #3a9a72;
  --wb-coral: #c87868;
  --wb-purple: #7868a8;
  --wb-gold: #c8a048;

  --c-root: #2878b8;
  --c-3rd: #389848;
  --c-b3: #389848;
  --c-b7: #c07828;
  --c-9th: #6858a8;
  --c-s9: #b84838;
  --c-b5: #b86848;
  --c-13th: #289878;
  --c-m7: #289878;

  --c-root-bg: #d8eaf8;
  --c-3rd-bg: #d8eed8;
  --c-b7-bg: #f8e8d0;
  --c-9th-bg: #e8e0f4;
  --c-s9-bg: #f4d8d4;
  --c-13th-bg: #d4f0e8;
  --c-m7-bg: #d4f0e8;

  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'Consolas', monospace;

  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 2px 8px rgba(61, 79, 98, 0.08);
  --shadow-card: 0 3px 12px rgba(61, 79, 98, 0.1);
}

body.theme-workbook {
  background-color: var(--paper);
  /* Grand staff pairs: treble + bass, repeating down the page */
  background-image: url('../images/grand-staff-pattern.svg');
  background-repeat: repeat-y;
  background-size: 100% 144px;
  background-position: top left;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
}

/* ── Header — workbook cover band ── */
body.theme-workbook .site-header {
  padding: 28px 48px 24px 72px;
  background: linear-gradient(180deg, #dce8f4 0%, #e8f0f8 100%);
  border-bottom: 3px solid var(--wb-blue);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
  z-index: 2;
}
body.theme-workbook .site-header::before {
  content: '♩ ♪ ♫ ♬ ♩ ♪ ♫ ♬';
  position: absolute;
  top: 10px;
  right: 48px;
  font-size: 14px;
  letter-spacing: 8px;
  color: rgba(74, 126, 184, 0.25);
  pointer-events: none;
}
body.theme-workbook .site-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 6px;
}
body.theme-workbook .site-header-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}
body.theme-workbook .site-logo {
  flex-shrink: 0;
  display: block;
  border-radius: 50%;
  box-shadow: 0 2px 6px rgba(61, 79, 98, 0.15);
}
body.theme-workbook .site-header h1 {
  font-family: var(--font-sans);
  font-size: 26px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.01em;
  margin-bottom: 0;
}
body.theme-workbook .site-header .subtitle {
  font-size: 14px;
  color: var(--ink-light);
  font-weight: 400;
  letter-spacing: 0.01em;
  max-width: 52em;
  line-height: 1.55;
}

/* ── Tabs — folder dividers ── */
body.theme-workbook .tab-bar {
  background: var(--paper-white);
  border-bottom: 2px solid var(--border);
  padding: 0 48px 0 72px;
  top: 0;
  z-index: 10;
  box-shadow: 0 2px 4px rgba(61, 79, 98, 0.04);
}
body.theme-workbook .tab-btn,
body.theme-workbook a.tab-btn--link {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--tab-link);
  padding: 14px 18px 12px;
  border-bottom: 3px solid transparent;
  letter-spacing: 0.01em;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  transition: background 0.15s, color 0.15s;
}
body.theme-workbook .tab-btn:hover,
body.theme-workbook a.tab-btn--link:hover {
  color: var(--ink);
  background: var(--paper-blue);
}
body.theme-workbook .tab-btn.active {
  color: var(--wb-blue);
  background: var(--paper-blue);
  border-bottom-color: var(--wb-blue);
}
body.theme-workbook .tab-btn[data-tab="progressions"].active {
  color: var(--wb-coral);
  background: #faf0ee;
  border-bottom-color: var(--wb-coral);
}
body.theme-workbook .tab-btn[data-tab="theory"].active {
  color: var(--wb-green);
  background: var(--paper-green);
  border-bottom-color: var(--wb-green);
}
body.theme-workbook .tab-btn[data-tab="tools"].active {
  color: var(--wb-purple);
  background: #f4f0fa;
  border-bottom-color: var(--wb-purple);
}
body.theme-workbook .tab-btn[data-tab="studios"] {
  color: var(--tab-studios);
}
body.theme-workbook .tab-btn[data-tab="studios"]:hover,
body.theme-workbook .tab-btn[data-tab="studios"].active {
  color: var(--tab-studios-hover);
  background: #eef8f4;
  border-bottom-color: var(--tab-studios);
}
body.theme-workbook .tab-btn[data-tab="support"] {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--wb-gold);
  filter: none;
  -webkit-text-fill-color: unset;
  background: transparent;
}
body.theme-workbook .tab-btn[data-tab="support"]:hover {
  background: #faf6ec;
  color: #a88030;
}
body.theme-workbook .tab-btn[data-tab="support"].active {
  background: #faf6ec;
  border-bottom-color: var(--wb-gold);
  color: #a88030;
  filter: none;
}

/* ── Sub-nav ── */
body.theme-workbook .key-nav,
body.theme-workbook .prog-top-nav,
body.theme-workbook .legend,
body.theme-workbook .theory-nav,
body.theme-workbook .tools-nav {
  background: var(--paper-white);
  border-bottom: 1px solid var(--border);
  padding: 12px 48px 12px 72px;
}
body.theme-workbook .key-nav a,
body.theme-workbook .prog-top-nav a,
body.theme-workbook .theory-nav a,
body.theme-workbook .tools-nav a {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-light);
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--paper-white);
  padding: 5px 12px;
  box-shadow: var(--shadow);
}
body.theme-workbook .key-nav a:hover,
body.theme-workbook .prog-top-nav a:hover,
body.theme-workbook .theory-nav a:hover,
body.theme-workbook .tools-nav a:hover {
  color: var(--wb-blue);
  border-color: var(--wb-blue);
  background: var(--paper-blue);
}

/* ── Workbook sections ── */
body.theme-workbook .key-section {
  padding: 36px 48px 44px 72px;
  border-bottom: 1px dashed var(--border);
  background: transparent;
  position: relative;
  z-index: 1;
}
body.theme-workbook .key-section:nth-child(even) {
  background: rgba(255, 254, 251, 0.7);
}
body.theme-workbook .key-title {
  font-family: var(--font-sans);
  font-size: 32px;
  font-weight: 700;
  color: var(--ink);
}
body.theme-workbook .key-meta {
  font-size: 12px;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-family: var(--font-mono);
}
body.theme-workbook .key-info {
  font-size: 14px;
  background: var(--paper-blue);
  border-left: 4px solid var(--wb-blue);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--ink-light);
  margin-bottom: 20px;
  box-shadow: var(--shadow);
  padding: 10px 16px;
}
body.theme-workbook .key-info span {
  color: var(--wb-subtitle);
  font-weight: 700;
}

/* Blue section subtitles — workbook, progressions, theory, tools */
body.theme-workbook .section-label,
body.theme-workbook .prog-subsection-title,
body.theme-workbook .blues-scale-select-label,
body.theme-workbook .legend-caption,
body.theme-workbook .voicing-label,
body.theme-workbook .hand-tag,
body.theme-workbook .prog-card-tag,
body.theme-workbook .theory-chapter-sub {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--wb-subtitle);
}
body.theme-workbook .section-label {
  border-bottom: 2px solid rgba(42, 96, 152, 0.35);
  padding-bottom: 7px;
  margin-bottom: 14px;
}
body.theme-workbook .prog-subsection-title {
  margin: 18px 0 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
body.theme-workbook .prog-subsection-title::after {
  content: '';
  flex: 1;
  height: 2px;
  background: rgba(42, 96, 152, 0.2);
}
body.theme-workbook .voicing-label span {
  color: var(--wb-subtitle);
  font-weight: 700;
}
body.theme-workbook .hand-tag {
  display: inline-block;
  font-size: 10px;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  background: rgba(42, 96, 152, 0.1);
  border: 1px solid rgba(42, 96, 152, 0.25);
}
body.theme-workbook .prog-card-tag {
  font-size: 10px;
  border-radius: var(--radius-sm);
  background: rgba(42, 96, 152, 0.08);
  border: 1px solid rgba(42, 96, 152, 0.2);
  padding: 2px 8px;
}
body.theme-workbook .legend-caption {
  font-size: 11px;
}
body.theme-workbook .blues-scale-select-label {
  font-size: 11px;
}

/* ── Chord cards — flashcards ── */
body.theme-workbook .chord-card {
  background: var(--paper-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.15s, transform 0.15s;
}
body.theme-workbook .chord-card:hover {
  box-shadow: 0 6px 20px rgba(61, 79, 98, 0.12);
  transform: translateY(-2px);
  border-color: var(--border2);
}
body.theme-workbook .chord-card.card-ii { border-top: 4px solid #7878c8; }
body.theme-workbook .chord-card.card-v  { border-top: 4px solid var(--wb-coral); }
body.theme-workbook .chord-card.card-i  { border-top: 4px solid var(--wb-green); }

body.theme-workbook .chord-card-header {
  background: var(--paper-blue);
  border-bottom: 1px solid var(--border);
  padding: 12px 14px;
  border-radius: var(--radius) var(--radius) 0 0;
}
body.theme-workbook .chord-name {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
}
body.theme-workbook .chord-role,
body.theme-workbook .role-dom,
body.theme-workbook .role-ii,
body.theme-workbook .role-v,
body.theme-workbook .role-i {
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.03em;
  padding: 3px 10px;
}
body.theme-workbook .role-dom  { color: #687888; background: #e8ecf0; }
body.theme-workbook .role-ii   { color: #5858a8; background: #e8e8f8; }
body.theme-workbook .role-v    { color: #a84838; background: #f8e8e4; }
body.theme-workbook .role-i    { color: #288868; background: #e4f4ec; }

/* ── Piano ── */
body.theme-workbook .piano-wrap {
  margin-bottom: 12px;
  border: 2px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 10px;
  background: var(--paper-white);
}
body.theme-workbook .key-b:not([class*="lit-"]) {
  background: #3a3848;
  border: 1px solid #2a2838;
  border-radius: 0 0 4px 4px;
}

/* ── Voicing boxes ── */
body.theme-workbook .voicing-box {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
body.theme-workbook .vn {
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 12px;
}
body.theme-workbook .vn-5th {
  background: var(--bg4);
  color: var(--ink-light);
}

/* ── Progressions ── */
body.theme-workbook .prog-group {
  padding: 36px 48px 0 72px;
  background: transparent;
  position: relative;
  z-index: 1;
}
body.theme-workbook .prog-group:nth-child(even) {
  background: rgba(255, 254, 251, 0.7);
}
body.theme-workbook .prog-group-title {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--ink);
  border-bottom: 2px solid var(--wb-coral);
  padding-bottom: 8px;
  margin-bottom: 10px;
}
body.theme-workbook .prog-group-desc {
  font-size: 15px;
  color: var(--ink-light);
  max-width: 42em;
  line-height: 1.65;
}
body.theme-workbook .prog-subgroup {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 2px dotted var(--border);
}
body.theme-workbook .prog-subgroup-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--wb-coral);
}
body.theme-workbook .prog-subgroup-desc {
  font-size: 14px;
  color: var(--ink-light);
}
body.theme-workbook .prog-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  background: var(--paper-white);
}
body.theme-workbook .prog-card-header {
  background: #faf0ee;
  border-bottom: 1px solid var(--border);
  border-radius: var(--radius) var(--radius) 0 0;
}
body.theme-workbook .prog-card-name {
  font-family: var(--font-serif);
  font-size: 20px;
  color: var(--ink);
}
body.theme-workbook .form-bar {
  background: var(--paper-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
}
body.theme-workbook .form-bar.turnaround {
  background: var(--paper-white);
  border-color: var(--border);
  box-shadow: var(--shadow), inset 3px 0 0 var(--wb-blue);
}
body.theme-workbook .form-bar.highlight {
  border-color: var(--wb-blue);
  background: var(--paper-blue);
}
body.theme-workbook .bar-chord {
  font-family: var(--font-serif);
  color: var(--ink);
}
body.theme-workbook .playing-now {
  outline: 3px solid var(--wb-blue);
  outline-offset: -3px;
  border-radius: var(--radius-sm);
}
body.theme-workbook .key-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--paper-white);
  color: var(--ink-light);
  box-shadow: var(--shadow);
}
body.theme-workbook .key-btn:hover {
  border-color: var(--wb-blue);
  color: var(--wb-blue);
  background: var(--paper-blue);
}
body.theme-workbook .key-btn.active {
  background: var(--wb-blue);
  color: #fff;
  border-color: var(--wb-blue);
}

/* ── Buttons ── */
body.theme-workbook .play-btn,
body.theme-workbook .play-prog-btn {
  background: var(--paper-blue);
  border: 1px solid var(--wb-blue);
  color: var(--wb-blue);
  border-radius: 20px;
  font-weight: 600;
  font-size: 12px;
}
body.theme-workbook .play-btn:hover,
body.theme-workbook .play-prog-btn:hover {
  background: var(--wb-blue);
  color: #fff;
}
body.theme-workbook .play-btn.is-playing,
body.theme-workbook .play-prog-btn.is-playing {
  background: var(--wb-blue);
  color: #fff;
  border-color: var(--gold2);
}

/* ── Voicing dock ── */
body.theme-workbook #voicing-dock {
  background: var(--paper-white);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}
body.theme-workbook #voicing-picker button {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-weight: 600;
  background: var(--paper);
}
body.theme-workbook #voicing-picker button.active,
body.theme-workbook #voicing-picker button:hover {
  background: var(--wb-blue);
  color: #fff;
  border-color: var(--wb-blue);
}

/* ── Theory ── */
body.theme-workbook .theory-page {
  padding-left: 72px;
  padding-right: 48px;
  position: relative;
  z-index: 1;
}
body.theme-workbook .theory-chapter {
  background: var(--paper-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  border-left: 5px solid var(--wb-green);
}
body.theme-workbook .theory-chapter h2 {
  font-family: var(--font-sans);
  font-size: 26px;
  font-weight: 700;
  color: var(--ink);
}
body.theme-workbook .theory-chapter h3 {
  font-family: var(--font-sans);
  font-size: 20px;
  font-weight: 700;
  color: var(--wb-green);
}
body.theme-workbook .th-jazz,
body.theme-workbook .th-gospel,
body.theme-workbook .th-blues {
  border-radius: 20px;
  font-weight: 600;
  font-size: 11px;
  padding: 3px 10px;
}
body.theme-workbook .th-jazz   { background: #e8f0f8; color: var(--wb-blue); }
body.theme-workbook .th-gospel { background: #f0e8f8; color: var(--wb-purple); }
body.theme-workbook .th-blues  { background: #f8ece8; color: var(--wb-coral); }
body.theme-workbook .theory-note {
  background: var(--paper-green);
  border-left: 4px solid var(--wb-green);
  padding: 12px 16px;
  font-size: 14px;
  color: var(--ink-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* ── Harmony tools / modals ── */
body.theme-workbook.prog-tools-open { overflow: hidden; }
body.theme-workbook .prog-tools-overlay {
  background: rgba(61, 79, 98, 0.35);
}
body.theme-workbook .prog-tools-sheet {
  background: var(--paper-white);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 12px 40px rgba(61, 79, 98, 0.18);
}
body.theme-workbook .prog-tools-modal-header {
  border-bottom: 1px solid var(--border);
  background: var(--paper-blue);
  border-radius: var(--radius) var(--radius) 0 0;
}
body.theme-workbook .prog-tools-modal-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 20px;
  color: var(--ink);
}
body.theme-workbook .prog-tools-modal-close {
  border: 1px solid var(--border);
  background: var(--paper-white);
  border-radius: var(--radius-sm);
  color: var(--ink-light);
  font-weight: 600;
}
body.theme-workbook .prog-tools-modal-close:hover {
  background: var(--paper-blue);
  color: var(--ink);
}
body.theme-workbook .prog-tools-modal-footer {
  border-top: 1px solid var(--border);
  background: var(--paper);
}
body.theme-workbook .beginner-demo {
  border: 1px solid var(--border);
  background: var(--paper-blue);
  border-radius: var(--radius-sm);
}

/* ── Blues scale ── */
body.theme-workbook .prog-blues-scale,
body.theme-workbook .blues-scale-block {
  background: var(--paper-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
body.theme-workbook .blues-scale-select {
  border: 1px solid var(--border);
  background: var(--paper-white);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 14px;
  padding: 8px 12px;
}
body.theme-workbook .blues-scale-ivv-row .beginner-demo {
  background: var(--paper-white);
  border: 1px solid var(--border);
}

/* ── Tooltip ── */
body.theme-workbook .tooltip-inner {
  background: var(--ink);
  color: var(--paper-white);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 12px;
  box-shadow: var(--shadow-card);
}

/* ── Support / Studios ── */
body.theme-workbook .support-page,
body.theme-workbook .studios-page {
  padding: 36px 48px 48px 72px;
  max-width: 42rem;
  position: relative;
  z-index: 1;
}
body.theme-workbook .support-title,
body.theme-workbook .studios-title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 28px;
  color: var(--ink);
  line-height: 1.25;
}
body.theme-workbook .studios-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--tab-studios);
}
body.theme-workbook .studios-lead,
body.theme-workbook .support-letter p {
  color: var(--ink-light);
  font-size: 16px;
  line-height: 1.7;
}
body.theme-workbook .studios-points {
  border: 1px solid var(--border);
  background: var(--paper-green);
  padding: 18px 20px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
body.theme-workbook .studios-points strong { color: var(--ink); }
body.theme-workbook .studios-cta,
body.theme-workbook .support-email {
  display: inline-block;
  background: var(--tab-studios);
  color: #fff;
  border: none;
  padding: 12px 22px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  border-radius: 24px;
  box-shadow: var(--shadow);
}
body.theme-workbook .studios-cta:hover,
body.theme-workbook .support-email:hover {
  background: var(--tab-studios-hover);
  transform: translateY(-1px);
}

/* ── Welcome modal ── */
body.theme-workbook.welcome-open { overflow: hidden; }
body.theme-workbook .welcome-overlay {
  background: rgba(61, 79, 98, 0.4);
}
body.theme-workbook .welcome-card {
  background: var(--paper-white);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 16px 48px rgba(61, 79, 98, 0.2);
}
body.theme-workbook .welcome-title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 24px;
  color: var(--ink);
}
body.theme-workbook .welcome-lead {
  font-size: 16px;
  color: var(--ink-light);
  line-height: 1.65;
}
body.theme-workbook .welcome-cta {
  background: var(--wb-blue);
  color: #fff;
  border: none;
  border-radius: 24px;
  font-weight: 600;
  font-size: 15px;
  padding: 12px 24px;
}
body.theme-workbook .welcome-dismiss {
  border: 1px solid var(--border);
  background: var(--paper);
  border-radius: var(--radius-sm);
  color: var(--ink-light);
}

/* ── Tip badges ── */
body.theme-workbook .tip-me-badge,
body.theme-workbook .donate-link.tip-me-badge {
  background: #faf6ec;
  color: var(--wb-gold);
  border: 1px solid #e8d8a8;
  font-weight: 600;
  border-radius: 20px;
  filter: none;
}
body.theme-workbook .tip-me-badge:hover {
  background: #f8f0dc;
  border-color: var(--wb-gold);
}

/* ── Footer ── */
body.theme-workbook[data-tab="theory"] .site-footer { margin-bottom: 72px; }
body.theme-workbook[data-tab="theory"] .theory-page { padding-bottom: 88px; }
body.theme-workbook .site-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 24px 48px 28px 72px;
  margin-bottom: 132px;
  border-top: 3px solid var(--wb-blue);
  background: var(--paper-blue);
  font-size: 13px;
  color: var(--ink-muted);
  position: relative;
  z-index: 1;
}
body.theme-workbook .site-footer a { color: var(--wb-blue); }
body.theme-workbook .site-footer-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}
body.theme-workbook .footer-suggestions {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--wb-blue);
  text-decoration: none;
  border: 1px solid var(--wb-blue);
  padding: 8px 16px;
  border-radius: 20px;
  background: var(--paper-white);
}
body.theme-workbook .footer-suggestions:hover {
  background: var(--wb-blue);
  color: #fff;
}

/* ── Metro / flow ── */
body.theme-workbook .metro-btn {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-weight: 600;
}
body.theme-workbook .metro-btn.active {
  background: var(--wb-blue);
  color: #fff;
  border-color: var(--wb-blue);
}
body.theme-workbook .progression-flow {
  background: var(--paper-blue);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
}
body.theme-workbook .prog-step-chord {
  font-family: var(--font-serif) !important;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  body.theme-workbook .site-header { padding: 20px 20px 16px 36px; }
  body.theme-workbook .tab-bar,
  body.theme-workbook .key-nav,
  body.theme-workbook .legend,
  body.theme-workbook .prog-top-nav { padding-left: 36px; padding-right: 16px; }
  body.theme-workbook .key-section,
  body.theme-workbook .prog-group { padding-left: 36px; padding-right: 20px; }
  body.theme-workbook .theory-page { padding-left: 36px; padding-right: 20px; }
  body.theme-workbook .support-page,
  body.theme-workbook .studios-page { padding-left: 36px; padding-right: 20px; }
  body.theme-workbook .site-footer { padding-left: 36px; }
}

@media (max-width: 600px) {
  body.theme-workbook {
    --tab-bar-sticky-offset: 72px;
  }
  body.theme-workbook .site-header {
    padding: 16px 16px 14px;
  }
  body.theme-workbook .site-header h1 { font-size: 24px; }
  body.theme-workbook .site-header .subtitle {
    font-size: 12px;
    line-height: 1.45;
  }
  body.theme-workbook .tab-bar {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    overflow-x: visible;
    padding: 0;
  }
  body.theme-workbook .tab-btn {
    font-size: 11px;
    padding: 10px 4px 8px;
    min-height: 40px;
    white-space: normal;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1.25;
    border-radius: 0;
  }
  body.theme-workbook .tab-label-full { display: none; }
  body.theme-workbook .tab-label-short { display: inline; }
  body.theme-workbook .key-nav,
  body.theme-workbook .prog-top-nav,
  body.theme-workbook .tools-nav {
    top: var(--tab-bar-sticky-offset);
    padding-left: 12px;
    padding-right: 12px;
  }
  body.theme-workbook .key-section,
  body.theme-workbook .prog-group,
  body.theme-workbook .theory-page,
  body.theme-workbook .support-page,
  body.theme-workbook .studios-page {
    padding-left: 16px;
    padding-right: 16px;
  }
  body.theme-workbook .site-footer {
    flex-direction: column;
    align-items: flex-start;
    padding: 20px 16px 28px;
  }
  body.theme-workbook .site-footer-actions { width: 100%; }
}

@media (max-width: 960px) {
  body.theme-workbook .blues-scale-ivv-row {
    grid-template-columns: 1fr;
  }
}