/* ==========================================================================
   Fretboard U — style.css
   Dark theme · amber accent · fretboard styled like a real neck
   ========================================================================== */

:root {
  /* App surface */
  --bg: #111827;
  --panel: #1f2937;
  --panel-2: #26334a;
  --border: #374151;
  --text: #f9fafb;
  --muted: #9ca3af;
  --accent: #f59e0b;
  --accent-soft: rgba(245, 158, 11, 0.14);

  /* Fretboard "wood & wire" */
  --board: #3b2a1e;
  --board-edge: #241811;
  --fret: #c9a86a;          /* brass fret wire */
  --nut: #e7e0d0;           /* bone nut */
  --string: #d1d5db;
  --inlay: #efe9db;         /* pearl dots */

  /* Non-note status accents — recording/error/success indicators that
     happen to reuse this palette but are unrelated to scale degrees */
  --iv-root: #ef4444;
  --iv-3: #3b82f6;
  --iv-5: #22c55e;
  --iv-dim: #64748b;
  --note: #cbd5e1;   /* uniform marker color when root highlighting is off */

  /* Scale-degree colors — the single source of truth for note color
     everywhere a note is shown: chord/scale diagrams, lesson markers,
     legends, selected notes. */
  --deg-1: #22c55e;  /* root */
  --deg-2: #2563eb;
  --deg-3: #facc15;
  --deg-4: #8b5cf6;
  --deg-5: #ef4444;
  --deg-6: #38bdf8;
  --deg-7: #d946ef;

  /* CAGED Lead Practice view layers */
  --layer-pent: #38bdf8;    /* pentatonic-only notes */
  --layer-major: #a78bfa;   /* major-scale-only notes */
  --layer-minor: #f472b6;   /* minor-scale-only notes */
  --target: #4ade80;        /* "go" notes leading into the next chord */

  --radius: 14px;
  --font-body: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background:
    radial-gradient(1200px 500px at 80% -10%, rgba(245, 158, 11, 0.07), transparent 60%),
    var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.45;
}

/* ---------- Header ---------- */

.app-header {
  padding: 34px 28px 10px;
  max-width: 1280px;
  margin: 0 auto;
}

.app-header h1 {
  margin: 0;
  font-size: clamp(1.7rem, 3.5vw, 2.5rem);
  letter-spacing: -0.02em;
  font-weight: 800;
}

.app-header h1 em {
  font-style: italic;
  color: var(--accent);
}

.app-header p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* The admin and technical hub headers carry two or more nav links in this
   paragraph; without a gap they read as one run-on sentence. */
.app-header p a + a { margin-left: 16px; }

/* ---------- Tabs ---------- */

.tabs {
  max-width: 1280px;
  margin: 18px auto 0;
  padding: 0 28px;
  display: flex;
  gap: 10px;
}

.tab {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--muted);
  font: inherit;
  font-weight: 700;
  font-size: 1rem;
  padding: 12px 30px;
  border-radius: var(--radius) var(--radius) 0 0;
  cursor: pointer;
  border-bottom: none;
  transition: color 120ms ease, background 120ms ease;
}

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

.tab.active {
  background: var(--panel-2);
  color: var(--accent);
  box-shadow: inset 0 3px 0 var(--accent);
}

.tab:focus-visible,
button:focus-visible,
select:focus-visible,
input:focus-visible,
.fretboard-container:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- Layout shell ---------- */

.app-shell {
  max-width: 1280px;
  margin: 0 auto 40px;
  padding: 0 28px;
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 18px;
  align-items: start;
}

/* ---------- Controls panel ---------- */

.controls-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 0 var(--radius) var(--radius) var(--radius);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.group-title {
  margin: 0 0 10px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.group-subtitle {
  margin: 6px 0 0;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.start-here-title {
  margin: 4px 0 2px;
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #2fbf5f;
}

.start-here-subhead {
  margin: 0 0 8px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
}

.control-group { display: flex; flex-direction: column; gap: 12px; }

.control { display: flex; flex-direction: column; gap: 5px; min-width: 0; }
.control-row { display: flex; gap: 10px; }
.control-row .control { flex: 1; }
.control.grow { flex: 1.6; }

label, .label {
  font-size: 0.78rem;
  color: var(--muted);
  font-weight: 600;
}

select {
  appearance: none;
  width: 100%;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 30px 8px 10px;
  font: inherit;
  font-size: 0.88rem;
  cursor: pointer;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6'><path d='M0 0l5 6 5-6z' fill='%239ca3af'/></svg>");
  background-repeat: no-repeat;
  background-position: right 10px center;
}

select:hover { border-color: var(--muted); }

/* Segmented buttons */

.segmented {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.segmented.stack { flex-direction: column; }

.segmented button {
  appearance: none;
  flex: 1;
  background: var(--bg);
  border: none;
  color: var(--muted);
  font: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 8px 6px;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease;
}

.segmented button + button { border-left: 1px solid var(--border); }
.segmented.stack button + button { border-left: none; border-top: 1px solid var(--border); }

.segmented button:hover { color: var(--text); }
.segmented button.on {
  background: var(--accent-soft);
  color: var(--accent);
}

/* Toggles */

.toggles { display: flex; flex-direction: column; gap: 8px; }

.toggle {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 0.85rem;
  color: var(--text);
  font-weight: 500;
  cursor: pointer;
}

.toggle input {
  appearance: none;
  width: 34px;
  height: 19px;
  border-radius: 999px;
  background: var(--border);
  position: relative;
  cursor: pointer;
  transition: background 140ms ease;
  flex: none;
}

.toggle input::after {
  content: "";
  position: absolute;
  top: 2px; left: 2px;
  width: 15px; height: 15px;
  border-radius: 50%;
  background: var(--text);
  transition: transform 140ms ease;
}

.toggle input:checked { background: var(--accent); }
.toggle input:checked::after { transform: translateX(15px); }

/* Custom tuning row */

.custom-tuning {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 5px;
}

.custom-tuning .string-tune { display: flex; flex-direction: column; gap: 3px; }
.custom-tuning .string-tune span {
  font-size: 0.62rem;
  color: var(--muted);
  text-align: center;
  font-family: var(--font-mono);
}
.custom-tuning select { padding: 5px 4px; text-align: center; background-image: none; font-family: var(--font-mono); }

/* Buttons */

.ghost-btn, .reset-btn {
  appearance: none;
  font: inherit;
  font-weight: 600;
  font-size: 0.85rem;
  border-radius: 8px;
  padding: 9px 12px;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease, border-color 120ms ease;
}

.ghost-btn {
  background: transparent;
  border: 1px dashed var(--border);
  color: var(--muted);
}
.ghost-btn:hover { color: var(--accent); border-color: var(--accent); }

.reset-btn {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--muted);
}
.reset-btn:hover { color: var(--text); border-color: var(--muted); }

.share-view { display: flex; flex-direction: column; gap: 8px; }

.share-output {
  display: flex;
  gap: 6px;
}

.share-url-input {
  flex: 1;
  min-width: 0;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  font: inherit;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.share-url-input:focus { outline: none; border-color: var(--accent); }

.share-note-input {
  resize: vertical;
  min-height: 54px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  font: inherit;
  font-size: 0.85rem;
}

.share-note-input:focus { outline: none; border-color: var(--accent); }

/* ---------- Teacher's note (shown when opening a shared link) ---------- */

.teacher-note-toggle {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 60;
  background: var(--panel-2);
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 10px 16px;
  font: inherit;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.45);
}

.teacher-note-toggle:hover { background: var(--accent-soft); }

.teacher-note-panel {
  position: fixed;
  right: 18px;
  bottom: 68px;
  z-index: 60;
  width: min(340px, calc(100vw - 36px));
  background: var(--panel);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  overflow: hidden;
}

.teacher-note-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 12px;
  background: var(--accent-soft);
  border-bottom: 1px solid var(--border);
}

.teacher-note-title {
  font-weight: 800;
  font-size: 0.9rem;
  color: var(--accent);
}

.teacher-note-close {
  background: none;
  border: none;
  color: var(--muted);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  padding: 2px 6px;
}

.teacher-note-close:hover { color: var(--text); }

.teacher-note-text {
  margin: 0;
  padding: 12px 14px;
  font-size: 0.9rem;
  line-height: 1.5;
  white-space: pre-wrap;
  overflow-wrap: break-word;
  max-height: 45vh;
  overflow-y: auto;
}

/* ---------- Visualizer panel ---------- */

.visualizer-panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
}

.summary-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
}

.summary-panel .summary-title {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0 0 2px;
}

.summary-panel .summary-title .flavor { color: var(--accent); }

.summary-panel .summary-notes {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  margin: 6px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.summary-panel .note-chip {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2px 9px;
}

.summary-panel .note-chip.is-root { border-color: var(--deg-1); color: #86efac; }

.summary-panel .summary-formula {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  margin: 6px 0 0;
}

.summary-panel .summary-meta {
  color: var(--muted);
  font-size: 0.8rem;
  margin: 8px 0 0;
}

.caged-note {
  margin: 8px 0 0;
  font-size: 0.82rem;
  color: var(--accent);
}

.play-btn {
  appearance: none;
  font: inherit;
  font-weight: 700;
  font-size: 0.8rem;
  margin-top: 12px;
  padding: 7px 16px;
  border-radius: 999px;
  border: 1px solid var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease;
}

.play-btn:hover { background: var(--accent); color: #0b1220; }

.drone-btn.droning {
  background: var(--accent);
  color: #0b1220;
  box-shadow: 0 0 0 3px var(--accent-soft);
}

/* CAGED cards */

.caged-cards {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 2px;
}

.caged-cards:empty { display: none; }

.caged-card {
  appearance: none;
  font: inherit;
  flex: none;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  padding: 9px 14px;
  cursor: pointer;
  text-align: left;
  transition: border-color 120ms ease, background 120ms ease;
}

.caged-card:hover { border-color: var(--muted); }

.caged-card.on {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.caged-card .shape-name {
  display: block;
  font-weight: 800;
  font-size: 0.95rem;
}

.caged-card.on .shape-name { color: var(--accent); }

.caged-card .shape-sub {
  display: block;
  font-size: 0.72rem;
  color: var(--muted);
  font-family: var(--font-mono);
}

/* Fretboard */

.fretboard-container {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 10px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
}

.fretboard-container svg { display: block; }

.fb-marker { cursor: pointer; }
.fb-marker circle { transition: transform 100ms ease; transform-box: fill-box; transform-origin: center; }
.fb-marker:hover circle { transform: scale(1.14); }

/* Scale playback: every position of the sounding note lights up */
.fb-marker.playing circle {
  transform: scale(1.28);
  stroke: var(--accent);
  stroke-width: 3;
  filter: brightness(1.35) drop-shadow(0 0 6px var(--accent));
}
.fb-marker text {
  pointer-events: none;
  user-select: none;
  font-family: var(--font-mono);
  font-weight: 700;
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}

/* Details panel */

.details-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  font-size: 0.85rem;
}

.details-panel .detail {
  display: flex;
  gap: 7px;
  align-items: baseline;
}

.details-panel .detail .k { color: var(--muted); font-size: 0.75rem; font-weight: 600; }
.details-panel .detail .v { font-family: var(--font-mono); }

.details-panel .note-info {
  width: 100%;
  border-top: 1px dashed var(--border);
  padding-top: 8px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

/* Tooltip */

.tooltip {
  position: fixed;
  z-index: 50;
  background: #0b1220;
  border: 1px solid var(--accent);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 6px 9px;
  border-radius: 7px;
  pointer-events: none;
  white-space: pre-line;
  box-shadow: 0 6px 18px rgba(0,0,0,0.5);
}

.hidden { display: none !important; }

/* Footer */

.app-footer {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 28px 30px;
  color: var(--muted);
  font-size: 0.75rem;
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .app-shell { grid-template-columns: 1fr; }
  .controls-panel { border-radius: var(--radius); }
  .app-header { padding: 24px 16px 6px; }
  .tabs, .app-shell, .app-footer { padding-left: 16px; padding-right: 16px; }
  .tab { flex: 1; padding: 12px 10px; text-align: center; }
}

@media (max-width: 480px) {
  .control-row { flex-direction: column; }
  .custom-tuning { grid-template-columns: repeat(3, 1fr); }
}

/* ---------- CAGED Lead Practice ---------- */

/* Collapsible <details> sections — used for the left panel's "Neck
   display options" / "Instruments & mix" sub-sections and the Jam
   Recorder card. The details element itself stays display:block (a
   flex details breaks open/close rendering); the flex column lives on
   the .collapsible-body wrapper. */
details.collapsible { display: block; }

.collapsible > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  user-select: none;
}

.collapsible > summary::-webkit-details-marker { display: none; }

.collapsible > summary::after {
  content: "▸";
  margin-left: auto;
  color: var(--muted);
  font-size: 0.9rem;
  transition: transform 120ms ease;
}

.collapsible[open] > summary::after { transform: rotate(90deg); }

.collapsible > summary .group-title,
.collapsible > summary .group-subtitle { margin: 0; }

.group-subtitle {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
}

.collapsible-hint {
  font-size: 0.72rem;
  color: var(--muted);
  font-weight: 400;
}

.collapsible-body {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 12px;
}

.helper-text {
  margin: 0;
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.4;
}

.helper-text.small { font-size: 0.72rem; margin-top: 5px; }

/* Fret Focus — Best Option CAGED's view window: Fret Start / Fret End
   pulldowns with a live readout badge */

.fret-focus-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}

.fret-focus-value {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 1px 9px;
  white-space: nowrap;
}

.fret-focus-value.focused {
  color: #0b1220;
  background: var(--accent);
  border-color: var(--accent);
  font-weight: 700;
}

.fret-focus-selects {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 4px;
}

.fret-focus-selects > div {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.progression-slots {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.prog-slot {
  display: grid;
  grid-template-columns: 20px 1fr 1.3fr 26px;
  gap: 6px;
  align-items: center;
}

.prog-slot .slot-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 700;
  text-align: center;
}

.prog-slot .remove-slot {
  appearance: none;
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 1rem;
  cursor: pointer;
  border-radius: 6px;
  padding: 2px;
  line-height: 1;
}

.prog-slot .remove-slot:hover { color: var(--iv-root); }
.prog-slot .remove-slot:disabled { opacity: 0.25; cursor: default; }

.primary-btn {
  appearance: none;
  font: inherit;
  font-weight: 700;
  font-size: 0.92rem;
  border-radius: 8px;
  padding: 11px 12px;
  cursor: pointer;
  background: var(--accent);
  border: 1px solid var(--accent);
  color: #0b1220;
  transition: filter 120ms ease;
}

.primary-btn:hover { filter: brightness(1.1); }
.primary-btn:disabled { opacity: 0.4; cursor: default; filter: none; }

#showLeadsBtn {
  background: #1e8e3e;
  border-color: #1e8e3e;
  color: #ffffff;
}

/* ---------- Backing Band ---------- */

.band-instruments {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.band-instrument {
  display: flex;
  flex-direction: column;
  gap: 7px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 9px 10px;
}

.band-instrument-head span {
  font-weight: 700;
  font-size: 0.85rem;
}

.band-instrument select {
  font-size: 0.82rem;
}

.band-volume {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.72rem;
  color: var(--muted);
}

.band-volume input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
}

/* ---------- Jam Recorder ---------- */

/* The recorder lives in the main visualizer column, below the summary
   panel's Strum/Play buttons — style it as a card and keep the narrow
   controls from stretching across the full column width. */
.visualizer-panel #leadControls {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
}

/* Collapsed: just the slim summary row */
.visualizer-panel #leadControls:not([open]) { padding: 10px 20px; }

.visualizer-panel #leadControls .control-row,
.visualizer-panel #leadControls .jam-current { max-width: 400px; }

.visualizer-panel #leadControls .record-btn {
  align-self: flex-start;
  min-width: 220px;
}

.visualizer-panel #leadControls .toggles {
  flex-direction: row;
  flex-wrap: wrap;
  gap: 8px 22px;
}

.record-btn {
  background: var(--iv-root);
  border-color: var(--iv-root);
  color: #fff;
}

.record-btn.recording {
  background: transparent;
  color: var(--iv-root);
  animation: rec-pulse 1s ease-in-out infinite;
}

@keyframes rec-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.45); }
  50%      { box-shadow: 0 0 0 6px rgba(239, 68, 68, 0); }
}

/* Bar → chord map — one cell per bar with a chord pulldown */

.jam-bar-chords {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
}

.jam-bar-chord {
  display: flex;
  flex-direction: column;
  gap: 3px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 7px 7px;
  animation: bar-pop 180ms ease-out backwards;
  transition: border-color 90ms ease, box-shadow 90ms ease;
}

.jam-bar-chord .bar-num {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--muted);
}

.jam-bar-chord select {
  padding: 5px 22px 5px 8px;
  font-size: 0.8rem;
  background-color: var(--panel);
}

.jam-bar-chord.active-rec  { border-color: var(--iv-5); box-shadow: 0 0 0 1px var(--iv-5); }
.jam-bar-chord.active-play { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }

@keyframes bar-pop {
  from { opacity: 0; transform: scale(0.9); }
  to   { opacity: 1; transform: scale(1); }
}

/* Bar/beat strip — live position readout for recording and playback */

.jam-visual {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.jam-visual-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

#jamVisualPhase {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.jam-visual.counting  #jamVisualPhase { color: var(--iv-root); }
.jam-visual.recording #jamVisualPhase { color: var(--iv-5); }
.jam-visual.playing   #jamVisualPhase { color: var(--accent); }

#jamVisualBar {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.jam-beat-boxes { display: grid; gap: 6px; }

.jam-click-box {
  height: 26px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel);
  transition: background 90ms ease, border-color 90ms ease;
}

.jam-click-box.count { background: var(--iv-root); border-color: var(--iv-root); }
.jam-click-box.rec   { background: var(--iv-5); border-color: var(--iv-5); }
.jam-click-box.play  { background: var(--accent); border-color: var(--accent); }

.jam-click-box.beat { animation: click-box-pulse 0.35s ease-out; }

@keyframes click-box-pulse {
  0%   { transform: scale(1.14); filter: brightness(1.45); }
  100% { transform: scale(1); filter: brightness(1); }
}

.jam-status { min-height: 1em; }
.jam-status.is-error { color: var(--iv-root); }

.jam-current { display: flex; gap: 8px; }
.jam-current .ghost-btn { flex: 1; }

.jam-takes { display: flex; flex-direction: column; gap: 6px; }

.jam-take {
  display: grid;
  grid-template-columns: 30px 1fr 26px;
  gap: 6px;
  align-items: center;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 5px 6px;
}

.jam-take-play {
  appearance: none;
  font: inherit;
  font-size: 0.75rem;
  font-weight: 700;
  border: 1px solid var(--accent);
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent);
  cursor: pointer;
  padding: 3px 0;
}

.jam-take-play.on { background: var(--accent); color: #0b1220; }
.jam-take-play:disabled { opacity: 0.35; cursor: default; }

.jam-take-name {
  font-size: 0.75rem;
  color: var(--muted);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.jam-take .remove-slot {
  appearance: none;
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 1rem;
  cursor: pointer;
  border-radius: 6px;
  padding: 2px;
  line-height: 1;
}

.jam-take .remove-slot:hover { color: var(--iv-root); }

/* Play-along transport — lives in the sticky .lead-transport bar;
   .summary-actions still wraps the Strum/Play button on chords/scales */

.summary-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 12px;
}

.summary-actions .play-btn { margin-top: 0; flex: none; }

.playback-control {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.playback-control .play-btn { min-width: 108px; }

.play-btn.playing { background: var(--accent); color: #0b1220; }

/* The visual metronome: big numbered beat circles + a live bar counter */

.beat-meter {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
}

.beat-indicator { display: flex; gap: 8px; }

.beat-dot {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--muted);
  background: var(--panel-2);
  border: 2px solid var(--border);
  transition: background 70ms ease, transform 70ms ease, border-color 70ms ease, color 70ms ease;
}

.beat-dot.downbeat { color: var(--iv-root); }

.beat-dot.on {
  background: var(--accent);
  border-color: var(--accent);
  color: #0b1220;
  transform: scale(1.18);
  animation: beat-pop 0.16s ease-out;
}

.beat-dot.downbeat.on { background: var(--iv-root); border-color: var(--iv-root); color: #fff; }

@keyframes beat-pop {
  0%   { transform: scale(1.35); }
  100% { transform: scale(1.18); }
}

.beat-bar-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  min-height: 1.1em;
}

@media (max-width: 640px) {
  .beat-dot { width: 26px; height: 26px; font-size: 0.75rem; }
}

.tempo-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.tempo-row label { flex: none; }

.tap-tempo-btn {
  appearance: none;
  flex: none;
  font: inherit;
  font-weight: 700;
  font-size: 0.82rem;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease;
}

.tap-tempo-btn:hover:not(:disabled) { background: var(--accent); color: #0b1220; }
.tap-tempo-btn:disabled { opacity: 0.5; cursor: default; }

.tap-tempo-btn.tapped { animation: tap-tempo-pulse 0.25s ease-out; }

@keyframes tap-tempo-pulse {
  0%   { transform: scale(1.12); filter: brightness(1.4); }
  100% { transform: scale(1); filter: brightness(1); }
}

.tempo-row input[type="range"] {
  width: 120px;
  accent-color: var(--accent);
}

.tempo-row output {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  min-width: 58px;
  text-align: right;
}

@media (max-width: 640px) {
  .tempo-row input[type="range"] { width: 90px; }
  .lead-transport { padding: 8px 12px; gap: 8px 12px; }
}

/* Chord boxes above the fretboard */

.lead-chord-boxes {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 2px;
}

.lead-chord-boxes:empty { display: none; }

/* Play-along dock — one box holding the transport row AND every
   strumming control, sitting between the chord boxes and the fretboard.
   Only the transport row stays pinned while scrolling (see .lead-transport
   below) — the dock itself scrolls with the page so the Strumming panel,
   which can grow tall with more bars/finer grid, never traps scrolling.
   Hidden by renderLeadTransport on every other view. */
.lead-dock {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.35);
}

.lead-transport {
  position: sticky;
  top: 0;
  z-index: 30; /* under the fret tooltip (z:50) */
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  padding: 10px 16px;
  background: var(--panel);
  border-radius: var(--radius) var(--radius) 0 0;
}

.lead-transport .play-btn { margin-top: 0; }

/* "Jam Recorder" chip in the transport — opens/closes the recorder
   card; shows a pulsing red dot while a take is recording or looping */
.jam-chip {
  appearance: none;
  flex: none;
  font: inherit;
  font-weight: 700;
  font-size: 0.82rem;
  margin-left: auto;
  padding: 4px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  transition: color 120ms ease, border-color 120ms ease;
}

.jam-chip:hover { color: var(--text); border-color: var(--muted); }

.jam-chip.busy { color: var(--iv-root); border-color: var(--iv-root); }

.jam-chip.busy::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--iv-root);
  animation: rec-pulse 1s ease-in-out infinite;
}

.lead-box {
  appearance: none;
  font: inherit;
  flex: 1;
  min-width: 100px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  padding: 12px 14px;
  cursor: pointer;
  text-align: center;
  transition: border-color 120ms ease, background 120ms ease, transform 120ms ease;
}

.lead-box:hover { border-color: var(--muted); }

.lead-box.on {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: inset 0 -3px 0 var(--accent);
}

.lead-box .box-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--muted);
  letter-spacing: 0.1em;
}

.lead-box .box-chord {
  display: block;
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.lead-box.on .box-chord { color: var(--accent); }

.lead-box .box-notes {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted);
  margin-top: 2px;
}

.lead-box .box-shapes {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.05em;
  color: var(--accent);
  opacity: 0.8;
  margin-top: 3px;
}

/* "Get ready" flash on the chord that takes over next bar — set by the
   Play Along loop on the last beat before a change */
.lead-box.next-up {
  border-color: var(--target);
  box-shadow: 0 0 0 2px var(--target);
  animation: next-up-pulse 0.45s ease-in-out infinite alternate;
}

@keyframes next-up-pulse {
  from { box-shadow: 0 0 0 1px var(--target); }
  to   { box-shadow: 0 0 0 3px var(--target); }
}

/* Strumming section of the play-along dock — collapsible pattern step
   editor, feel sliders and bar arrangement, laid out horizontally so the
   whole thing stays shallow above the fretboard */

.strum-dock { border-top: 1px solid var(--border); }

.strum-dock-summary {
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 16px;
  cursor: pointer;
  user-select: none;
}

.strum-dock-summary::-webkit-details-marker { display: none; }

.strum-dock-summary::before {
  content: "▸";
  color: var(--muted);
  font-size: 0.75rem;
  transition: transform 120ms ease;
}

.strum-dock[open] .strum-dock-summary::before { transform: rotate(90deg); }

.strum-dock-title {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.strum-dock-hint { font-size: 0.7rem; color: var(--muted); }

.strum-dock-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 2px 16px 14px;
}

.strum-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 10px 18px;
}

.strum-field { display: flex; flex-direction: column; gap: 4px; }

.strum-field label,
.strum-field .label,
.strum-slider .label {
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.strum-field select { padding: 6px 26px 6px 9px; font-size: 0.8rem; }

.strum-steps-wrap { flex: 1; min-width: 240px; max-width: 540px; }

.strum-beat-labels {
  display: grid;
  gap: 3px;
  margin-bottom: 3px;
}

.strum-beat-labels span {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--muted);
}

.strum-beat-labels .beat-num { color: var(--accent); font-weight: 700; }

.strum-step-grid {
  display: grid;
  gap: 3px;
}

.strum-step {
  appearance: none;
  font: inherit;
  font-size: 0.88rem;
  font-weight: 700;
  line-height: 1;
  padding: 7px 0;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--muted);
  cursor: pointer;
  transition: background 100ms ease, color 100ms ease, border-color 100ms ease,
              transform 100ms ease, filter 100ms ease;
}

.strum-step.beat-start { border-left-width: 2px; }
.strum-step:hover { border-color: var(--muted); }

.strum-step.down { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }
.strum-step.down.accent { color: #0b1220; background: var(--accent); }

.strum-step.up { color: var(--iv-3); border-color: var(--iv-3); background: rgba(59, 130, 246, 0.14); }
.strum-step.up.accent { color: #fff; background: var(--iv-3); }

.strum-step.bass { color: var(--iv-5); border-color: var(--iv-5); background: rgba(34, 197, 94, 0.14); }
.strum-step.scratch { color: var(--text); border-style: dashed; }

.strum-step.hit { transform: scale(1.16); filter: brightness(1.4); }

.strum-hint {
  font-size: 0.68rem;
  color: var(--muted);
  margin: 0;
}

.strum-sliders {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.strum-slider { width: 168px; }

.strum-slider .label { display: block; margin-bottom: 2px; }

.strum-slider-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.strum-slider-row span {
  flex: none;
  font-size: 0.6rem;
  color: var(--muted);
}

.strum-slider-row input[type="range"] {
  flex: 1;
  min-width: 0;
  accent-color: var(--accent);
}

/* Bar → chord grid inside the dock: shallow cells that flow across the
   full width instead of the jam panel's 2-column stack */
.strum-bar-chords {
  flex: 1 1 100%;
  grid-template-columns: repeat(auto-fill, minmax(92px, 1fr));
}

@media (max-width: 640px) {
  .strum-slider { width: 140px; }
  .strum-dock-hint { display: none; }
}

/* Lead view layer bar — clickable legend between the chord boxes and
   the fretboard, so layers can be flipped live while the loop plays */

.lead-layer-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.lead-layer-bar:empty { display: none; }

.layer-chip {
  appearance: none;
  font: inherit;
  font-size: 0.75rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  padding: 5px 12px 5px 8px;
  cursor: pointer;
  transition: border-color 120ms ease, color 120ms ease, background 120ms ease;
}

.layer-chip:hover:not(:disabled) { border-color: var(--muted); color: var(--text); }

.layer-chip.on {
  color: var(--text);
  border-color: var(--chip, var(--accent));
  background: var(--bg);
}

.layer-chip:disabled { opacity: 0.4; cursor: default; }

.layer-chip .chip-swatch {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  flex: none;
  background: var(--chip, var(--accent));
  opacity: 0.45;
}

.layer-chip.on .chip-swatch { opacity: 1; }

.layer-chip.sw-multi .chip-swatch {
  background: linear-gradient(135deg, var(--deg-1), var(--deg-3) 50%, var(--deg-5));
}

.layer-chip.sw-ring .chip-swatch {
  background: transparent;
  border: 2.5px solid var(--chip, var(--target));
}

/* Target rings on the fretboard — the "go" notes into the next chord */

.fb-target-ring { pointer-events: none; }

.fb-target-ring.primary { animation: target-pulse 1.5s ease-in-out infinite; }

@media (prefers-reduced-motion: reduce) {
  .fb-target-ring.primary { animation: none; }
}

@keyframes target-pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.35; }
}

/* Next-chord target summary line */

.target-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-top: 10px;
  font-size: 0.8rem;
  color: var(--muted);
}

.target-line .target-head {
  font-weight: 700;
  color: var(--target);
}

.target-chip {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--bg);
  border: 1px dashed var(--target);
  color: var(--target);
  border-radius: 6px;
  padding: 2px 8px;
}

.target-chip.primary {
  border-style: solid;
  border-width: 2px;
  font-weight: 700;
}

/* ---------- Lessons ---------- */

.lesson-list { display: flex; flex-direction: column; gap: 7px; }

.lesson-item {
  appearance: none;
  font: inherit;
  text-align: left;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  padding: 10px 12px;
  cursor: pointer;
  transition: border-color 120ms ease, background 120ms ease;
}

.lesson-item:hover { border-color: var(--muted); }
.lesson-item.on { border-color: var(--accent); background: var(--accent-soft); }

.lesson-item .lesson-name { display: block; font-weight: 700; font-size: 0.88rem; }
.lesson-item.on .lesson-name { color: var(--accent); }

.lesson-item .lesson-sub {
  display: block;
  font-size: 0.7rem;
  color: var(--muted);
  font-family: var(--font-mono);
  margin-top: 2px;
}

.lesson-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
}

.lesson-panel:empty { display: none; }
.summary-panel:empty { display: none; }
.details-panel:empty { display: none; }

.lesson-head {
  margin: 0;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-family: var(--font-mono);
}

.lesson-step-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.lesson-step-title {
  margin: 6px 0 4px;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.lesson-read-btn {
  flex: none;
  font-size: 0.78rem;
  padding: 4px 10px;
  white-space: nowrap;
}

/* Narration settings, under the lesson list in the Fretboard 101 panel */
.narration-settings {
  margin-top: 14px;
  border-top: 1px solid var(--border);
  padding-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.lesson-step-text {
  margin: 0;
  color: var(--text);
  font-size: 0.9rem;
  line-height: 1.55;
  max-width: 70ch;
}

.lesson-task {
  margin-top: 12px;
  border-top: 1px dashed var(--border);
  padding-top: 10px;
}

.task-progress {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
}

.task-progress.done { color: var(--iv-5); }

.quiz-question { margin: 0 0 8px; font-weight: 600; font-size: 0.9rem; }

.quiz-choices { display: flex; flex-wrap: wrap; gap: 8px; }

.quiz-btn {
  appearance: none;
  font: inherit;
  font-weight: 600;
  font-size: 0.85rem;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 14px;
  cursor: pointer;
  transition: border-color 120ms ease, background 120ms ease;
}

.quiz-btn:hover:not(:disabled) { border-color: var(--accent); }
.quiz-btn.correct { border-color: var(--iv-5); background: rgba(34, 197, 94, 0.15); color: var(--iv-5); }
.quiz-btn.wrong { border-color: var(--iv-root); background: rgba(239, 68, 68, 0.12); color: #fca5a5; }

.lesson-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 14px;
}

.lesson-nav .primary-btn { padding: 8px 18px; font-size: 0.85rem; }

.step-dots { display: flex; gap: 6px; }
.step-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--border); }
.step-dot.on { background: var(--accent); }
.step-dot.done { background: var(--iv-5); }

.ghost-btn:disabled { opacity: 0.35; cursor: default; }

.fb-hotspot { cursor: pointer; }
.fb-hotspot:hover { fill: rgba(245, 158, 11, 0.18); }

/* Shape span chips in summary */

.shape-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

.shape-chip {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--bg);
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 6px;
  padding: 3px 9px;
}

/* ---------- Teacher Dashboard ---------- */

.lesson-canvas {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Welcome / empty state */
.tb-welcome {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 26px;
}
.tb-welcome-title {
  margin: 0 0 8px;
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.tb-welcome-lead { margin: 0 0 16px; color: var(--muted); max-width: 62ch; }
.tb-welcome-steps {
  margin: 0 0 20px;
  padding-left: 20px;
  color: var(--text);
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-width: 62ch;
}
.tb-welcome-steps li { line-height: 1.45; }
.tb-welcome-cta { max-width: 320px; }

/* Lesson editor header */
.tb-lesson-header {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.tb-lesson-title-input {
  font: inherit;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  background: transparent;
  border: none;
  border-bottom: 2px solid var(--border);
  color: var(--text);
  padding: 4px 2px;
  border-radius: 0;
}
.tb-lesson-title-input:focus { outline: none; border-bottom-color: var(--accent); }
.tb-lesson-intro-input {
  font: inherit;
  font-size: 0.9rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 8px 10px;
  resize: vertical;
}
.tb-lesson-intro-input:focus { outline: none; border-color: var(--accent); }
.tb-lesson-title { margin: 0; font-size: 1.55rem; font-weight: 800; letter-spacing: -0.02em; }
.tb-lesson-intro { margin: 8px 0 0; color: var(--muted); max-width: 66ch; }

/* Block stack */
.tb-blocks { display: flex; flex-direction: column; gap: 14px; }

.tb-block {
  background: var(--panel);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  animation: tb-block-in 200ms ease-out backwards;
}
.tb-block.read-only { border-left-color: var(--iv-5); }

@keyframes tb-block-in {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.tb-block-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.tb-block-badge {
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 3px 9px;
  border-radius: 999px;
}
.tb-block-tools { display: flex; gap: 4px; }
.tb-tool {
  appearance: none;
  font: inherit;
  font-size: 0.85rem;
  min-width: 28px;
  height: 28px;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--muted);
  cursor: pointer;
  transition: color 120ms ease, border-color 120ms ease, background 120ms ease;
}
.tb-tool:hover:not(:disabled) { color: var(--accent); border-color: var(--accent); }
.tb-tool.danger:hover:not(:disabled) { color: var(--iv-root); border-color: var(--iv-root); }
.tb-tool:disabled { opacity: 0.3; cursor: default; }

.tb-block-title-input {
  font: inherit;
  font-size: 1.05rem;
  font-weight: 700;
  background: transparent;
  border: none;
  border-bottom: 1px dashed var(--border);
  color: var(--text);
  padding: 3px 2px;
  border-radius: 0;
}
.tb-block-title-input:focus { outline: none; border-bottom-color: var(--accent); border-bottom-style: solid; }
.tb-block-title { margin: 0; font-size: 1.1rem; font-weight: 700; }

.tb-block-desc-input {
  font: inherit;
  font-size: 0.86rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 7px 9px;
  resize: vertical;
}
.tb-block-desc-input:focus { outline: none; border-color: var(--accent); }
.tb-block-desc { margin: 0; color: var(--muted); font-size: 0.9rem; line-height: 1.5; white-space: pre-wrap; }

/* Collapsible settings */
.tb-settings-wrap {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
}
.tb-settings-wrap > summary {
  cursor: pointer;
  padding: 8px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  user-select: none;
  list-style: none;
}
.tb-settings-wrap > summary::-webkit-details-marker { display: none; }
.tb-settings-wrap[open] > summary { border-bottom: 1px solid var(--border); color: var(--text); }

.tb-settings {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px 12px;
  padding: 12px;
}
.tb-field { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.tb-field-label {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--muted);
}
.tb-field select { width: 100%; font-size: 0.82rem; }
.tb-toggles {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  padding-top: 2px;
}
.tb-toggle { font-size: 0.8rem; }

/* Framing sub-group: string subset + custom fret window */
.tb-framing {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin-top: 4px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}
.tb-subhead {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
}
.tb-strings-field { display: flex; flex-direction: column; gap: 6px; }
.tb-strings-row { display: flex; gap: 6px; }
.tb-string-toggle {
  flex: 1;
  min-width: 0;
  padding: 6px 0;
  font-size: 0.8rem;
  font-weight: 600;
  font-family: var(--font-mono, monospace);
  color: var(--muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
}
.tb-string-toggle:hover { border-color: var(--accent); }
.tb-string-toggle.on {
  color: #0b1220;
  background: var(--accent);
  border-color: var(--accent);
}
.tb-fretwindow-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px 12px;
}
.tb-num-input {
  width: 100%;
  padding: 5px 8px;
  font-size: 0.82rem;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.tb-num-input:focus { outline: none; border-color: var(--accent); }
.tb-field-hint { margin: 0; font-size: 0.72rem; line-height: 1.4; color: var(--muted); }

/* Block fretboard preview */
.tb-board {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 10px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
}
.tb-board svg { display: block; }

.tb-block-summary {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
}

/* Block audio row */
.tb-audio {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}
.tb-play { margin-top: 0; }
.tb-audio-hint { font-size: 0.74rem; color: var(--muted); }

/* Scale playback tempo — teacher dials it to the student's level */
.tb-scale-tempo { display: flex; align-items: center; gap: 8px; }
.tb-scale-tempo-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}
.tb-scale-tempo input[type="range"] {
  width: 130px;
  accent-color: var(--accent);
  cursor: pointer;
}
.tb-scale-tempo output {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  min-width: 58px;
}
@media (max-width: 640px) {
  .tb-scale-tempo input[type="range"] { width: 90px; }
}
.tb-scale-loop { font-size: 0.76rem; padding: 6px 10px; }
.tb-scale-loop.on {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent) inset;
}
.tb-voice { display: flex; align-items: center; gap: 6px; margin-left: auto; }
.tb-voice-btn { font-size: 0.76rem; padding: 6px 10px; }
.tb-voice-btn.recording { border-color: var(--iv-root); color: var(--iv-root); animation: tb-rec-pulse 1s ease-in-out infinite; }
@keyframes tb-rec-pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.55; } }
.tb-voice-error { margin: 0; font-size: 0.8rem; color: var(--iv-root); }

/* ==========================================================================
   Teacher Dashboard — chord progression blocks
   Editor: one compact card per chord. Player: a transport styled like a
   piece of studio gear — big NOW/NEXT chords, beat lamps, tempo fader.
   ========================================================================== */

/* --- Editor --- */
.tb-prog-editor { display: flex; flex-direction: column; }
.tb-prog-toprow { padding-bottom: 4px; }

.tb-prog-chords {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(168px, 1fr));
  gap: 10px;
  padding: 4px 12px 14px;
}
.tb-prog-chordcard {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 11px 12px;
  display: flex;
  flex-direction: column;
  gap: 7px;
  min-width: 0;
}
.tb-prog-chordhead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
}
.tb-prog-chordsym {
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--accent);
  letter-spacing: 0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.tb-prog-addchord {
  appearance: none;
  border: 1.5px dashed var(--border);
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.86rem;
  font-weight: 600;
  min-height: 96px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.tb-prog-addchord:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}

/* --- Player / transport --- */
.tb-prog-player {
  background: linear-gradient(180deg, var(--panel-2), rgba(17, 24, 39, 0.55));
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.tb-prog-player.playing {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft), 0 10px 26px rgba(0, 0, 0, 0.32);
}

.tb-prog-transport {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.tb-prog-playbtn {
  appearance: none;
  width: 56px;
  height: 56px;
  flex: none;
  border-radius: 50%;
  border: 1.5px solid var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 1.35rem;
  line-height: 1;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, transform 0.1s;
}
.tb-prog-playbtn:hover { background: var(--accent); color: #0b1220; }
.tb-prog-playbtn:active { transform: scale(0.94); }
.tb-prog-player.playing .tb-prog-playbtn { background: var(--accent); color: #0b1220; }

.tb-prog-now, .tb-prog-next { display: flex; flex-direction: column; gap: 1px; min-width: 0; }
.tb-prog-slot-label {
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}
.tb-prog-nowchord {
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  font-weight: 800;
  line-height: 1.05;
  color: var(--text);
  transition: color 0.15s;
}
.tb-prog-player.playing .tb-prog-nowchord { color: var(--accent); }
.tb-prog-arrow { color: var(--muted); font-size: 1.2rem; margin-top: 12px; }
.tb-prog-nextchord {
  font-size: clamp(1.1rem, 2.6vw, 1.5rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--muted);
}

.tb-prog-meter {
  margin-left: auto;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 7px;
}
.tb-prog-beats { display: flex; gap: 7px; }
.tb-prog-beat {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: transparent;
  transition: background 0.08s, border-color 0.08s, box-shadow 0.08s;
}
.tb-prog-beat.downbeat { border-color: var(--muted); }
.tb-prog-beat.on {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}
.tb-prog-barcount {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--muted);
  white-space: nowrap;
}

/* Tempo fader + click toggle */
.tb-prog-groove {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.tb-prog-groove-label {
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}
.tb-prog-tempo {
  flex: 1;
  min-width: 140px;
  accent-color: var(--accent);
  cursor: pointer;
}
.tb-prog-bpm {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--accent);
  width: 64px;
  text-align: right;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px 6px;
}
.tb-prog-bpm-unit {
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}
.tb-prog-nudge {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 9px;
  flex: 0 0 auto;
}
.tb-prog-click { margin-left: auto; }

/* Chord timeline — chip width tracks each chord's bar count */
.tb-prog-timeline { display: flex; gap: 6px; flex-wrap: wrap; }
.tb-prog-chip {
  flex: 1 0 64px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 10px 8px;
  text-align: center;
  min-width: 0;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s;
}
.tb-prog-chip:hover { border-color: var(--accent); }
.tb-prog-chip.active {
  background: var(--accent-soft);
  border-color: var(--accent);
}
.tb-prog-chip-name {
  display: block;
  font-weight: 800;
  font-size: 0.95rem;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.tb-prog-chip.active .tb-prog-chip-name { color: var(--accent); }
.tb-prog-chip-bars {
  display: block;
  font-size: 0.66rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

/* Live fretboard under the transport */
.tb-prog-boardsec {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-top: 1px solid var(--border);
  padding-top: 12px;
}
.tb-prog-boardctl {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.tb-prog-boardctl select { max-width: 280px; }
.tb-prog-boardwrap { min-width: 0; }
.tb-prog-board { border-radius: 8px; }
.tb-prog-boardcap {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--muted);
  text-align: center;
}

.tb-prog-hint { margin: 0; font-size: 0.74rem; color: var(--muted); }

@media (max-width: 640px) {
  .tb-prog-meter { margin-left: 0; width: 100%; flex-direction: row; align-items: center; justify-content: space-between; }
  .tb-prog-click { margin-left: 0; }
}

/* --- Block strumming ---
   The chord block's strum transport borrows the progression player's shell
   (same card, same tempo row, same accent-glow "playing" state) so the two
   read as one family, and the pattern chart itself reuses the Play Along
   Strumming panel's step cells and slider rows. */
.tb-strum-player {
  background: linear-gradient(180deg, var(--panel-2), rgba(17, 24, 39, 0.55));
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 11px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.tb-strum-player.playing {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft), 0 10px 26px rgba(0, 0, 0, 0.32);
}

.tb-strum-transport {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.tb-strum-playbtn { flex: none; }
.tb-strum-player.playing .tb-strum-playbtn {
  background: var(--accent);
  color: #0b1220;
  border-color: var(--accent);
}

.tb-strum-beats { display: flex; gap: 7px; }
.tb-strum-beat {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: transparent;
  transition: background 0.08s, border-color 0.08s, box-shadow 0.08s;
}
.tb-strum-beat.downbeat { border-color: var(--muted); }
.tb-strum-beat.on {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}
.tb-strum-barcount {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--muted);
  white-space: nowrap;
}

.tb-strum-groove {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* Collapsible pattern chart — same shell as the block settings drawer */
.tb-strum-wrap {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
}
.tb-strum-wrap > summary {
  cursor: pointer;
  padding: 8px 12px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--muted);
  user-select: none;
  list-style: none;
}
.tb-strum-wrap > summary::-webkit-details-marker { display: none; }
.tb-strum-wrap[open] > summary { border-bottom: 1px solid var(--border); color: var(--text); }

.tb-strum-body {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 11px;
}
.tb-strum-steps { width: 100%; }

/* A shared lesson's chart is a read-only score: still legible and it still
   lights up as it plays, but it makes no promise of being clickable. */
.tb-strum-body .strum-step:disabled { cursor: default; opacity: 0.95; }
.tb-strum-body .strum-step:disabled:hover { border-color: var(--border); }
.tb-strum-body .strum-step.hit { transform: scale(1.16); filter: brightness(1.4); }

@media (max-width: 640px) {
  .tb-strum-barcount { margin-left: 0; }
}

/* Add-block row */
.tb-add-block { display: flex; gap: 10px; flex-wrap: wrap; }
.tb-add-block .ghost-btn { flex: 1; min-width: 160px; }

/* Left-panel lesson list */
.tb-lesson-list { display: flex; flex-direction: column; gap: 6px; margin-top: 4px; }
.tb-lesson-row {
  display: grid;
  grid-template-columns: 1fr 28px 28px;
  gap: 5px;
  align-items: stretch;
}
.tb-lesson-open {
  appearance: none;
  text-align: left;
  font: inherit;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
  transition: border-color 120ms ease;
}
.tb-lesson-open:hover { border-color: var(--accent); }
.tb-lesson-name {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.tb-lesson-meta { font-size: 0.72rem; color: var(--muted); }
.tb-lesson-row .tb-tool { height: auto; }

.tb-share { display: flex; flex-direction: column; gap: 8px; margin-top: 4px; }

/* Lesson editor — Save / Save & Close action bars */
.tb-editor-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0;
  margin-bottom: 4px;
}
.tb-editor-actions:not(.bottom) {
  position: sticky;
  top: 0;
  z-index: 5;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}
.tb-editor-actions.bottom { margin-top: 14px; margin-bottom: 0; border-top: 1px solid var(--border); }
.tb-actions-spacer { flex: 1; }
.tb-crumb {
  appearance: none;
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  background: transparent;
  border: none;
  padding: 4px 2px;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 45%;
}
.tb-crumb:hover { color: var(--accent); }
.tb-save-status { font-size: 0.8rem; color: var(--target, #34d399); font-weight: 600; white-space: nowrap; }
.tb-save-btn { padding-top: 8px; padding-bottom: 8px; }

/* Student lesson library (canvas) */
.tb-empty { display: flex; flex-direction: column; gap: 12px; align-items: flex-start; padding: 8px 0; }
.tb-lessoncards { display: flex; flex-direction: column; gap: 10px; margin-bottom: 12px; }
.tb-lessoncard {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
}
.tb-lessoncard-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.tb-lessoncard-open {
  appearance: none;
  text-align: left;
  font: inherit;
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
  min-width: 0;
  padding: 0;
}
.tb-lessoncard-open:hover .tb-lesson-name { color: var(--accent); }
.tb-lessoncard-tools { display: flex; align-items: center; gap: 6px; }
.tb-card-btn { padding: 6px 10px; font-size: 0.82rem; }

/* Student (shared-link) mode */
.tb-student-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  background: linear-gradient(120deg, rgba(34,197,94,0.14), rgba(34,197,94,0.04));
  border: 1px solid var(--iv-5);
  border-radius: var(--radius);
  padding: 12px 16px;
}
.tb-student-tag { font-weight: 700; color: var(--iv-5); }

/* ---------- Student sign-in (teacher's credentials card) ----------
   Sits between the pupil's name and their lesson library, and is styled as a
   distinctly separate object rather than another lesson card: it is the only
   thing on the screen that acts on a person rather than on content, and the
   consequences of a mis-click here (suspending someone's access) are not the
   same as a mis-click on a lesson. */
.tb-login-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.tb-login-title {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}
.tb-login-warning {
  margin: 0;
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 0.78rem;
  line-height: 1.45;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(245, 158, 11, 0.35);
}
.tb-login-form { display: flex; flex-direction: column; gap: 10px; max-width: 420px; }
.tb-login-input {
  width: 100%;
  font-size: 0.86rem;
  /* Wide enough that a generated password is readable at a glance — the
     teacher has to read it aloud, so truncation would defeat the point. */
  font-variant-numeric: tabular-nums;
}
.tb-login-pw-row { display: flex; gap: 6px; align-items: stretch; }
.tb-login-pw-row .tb-login-input { flex: 1 1 auto; }
.tb-login-pw-row .tb-tool { flex: 0 0 auto; width: 34px; height: auto; }

.tb-login-summary { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.tb-login-email {
  font-weight: 600;
  font-size: 0.9rem;
  word-break: break-all;
}
.tb-login-badge {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 3px 8px;
  border-radius: 999px;
  color: var(--iv-5);
  background: rgba(34, 197, 94, 0.14);
  border: 1px solid var(--iv-5);
}
.tb-login-badge.is-disabled {
  color: var(--muted);
  background: transparent;
  border-color: var(--border);
}
.tb-login-tools { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.tb-login-status {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.45;
  color: var(--muted);
  min-height: 1.1em;
  /* Generated passwords are echoed back here after a reset, so it has to be
     selectable and must not collapse a run of characters. */
  user-select: text;
  word-break: break-word;
}
.tb-login-status.is-error { color: var(--iv-root); }

/* Login state on a roster row, so "who still needs setting up?" is answerable
   without opening anybody. */
.tb-roster-login { font-weight: 600; }
.tb-roster-login.is-active { color: var(--iv-5); }
.tb-roster-login.is-disabled { color: var(--accent); }
.tb-roster-login.is-none { color: var(--muted); }

/* ---------- Add / edit a student ----------
   A real form, on the canvas rather than in the narrow control column,
   because eight fields in a 280px rail is a scroll rather than a form. */
.tb-student-form { display: flex; flex-direction: column; gap: 18px; max-width: 720px; }

/* Two columns that collapse to one. The widths are the fields' own — a state
   abbreviation and a ZIP do not want the same box as a street's worth of city
   name, and giving them one makes the form look machine-generated. */
.tb-form-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px 14px;
}
.tb-field-half { grid-column: span 2; }
.tb-field-quarter { grid-column: span 1; }
@media (max-width: 620px) {
  .tb-form-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tb-field-half { grid-column: span 2; }
}
.tb-student-form .tb-login-input,
.tb-student-form input[type="text"],
.tb-student-form input[type="email"],
.tb-student-form input[type="tel"] { width: 100%; }

.tb-form-section {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px 16px;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.tb-form-legend {
  padding: 0 6px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- The student record, at the top of their lesson page ----------
   Read-only on purpose. Everything here is edited behind one button, so there
   is no field on this card that can be changed by a stray click while the
   teacher is looking for the lesson they came to open. */
.tb-profile-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin-bottom: 16px;
}
.tb-profile-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.tb-profile-heading { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; min-width: 0; }
.tb-profile-name { margin: 0; font-size: 1.25rem; line-height: 1.2; word-break: break-word; }
.tb-login-badge.is-none { color: var(--muted); background: transparent; border-color: var(--border); }

.tb-profile-rows {
  display: grid;
  /* Labels size to their content and stop; the values take the rest. A fixed
     label column would leave "Phone" swimming beside "Signs in as". */
  grid-template-columns: max-content minmax(0, 1fr);
  gap: 6px 18px;
  margin: 14px 0 0;
}
.tb-profile-label {
  margin: 0;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--muted);
  align-self: center;
}
.tb-profile-value {
  margin: 0;
  font-size: 0.88rem;
  word-break: break-word;
  /* Read aloud to a student over the phone often enough to be worth selecting
     cleanly. */
  user-select: text;
}
.tb-profile-mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.84rem; }

/* ---------- The student's own landing page ----------
   What a pupil sees first, every time. Greeting, then the one lesson they most
   likely came for, then everything else — in that order, because a list of
   twelve lessons answers "what have I got" and never "what do I do now". */
.st-greeting { margin-bottom: 18px; }
.st-greeting-title { margin: 0 0 4px; font-size: 1.5rem; line-height: 1.2; }
.st-greeting-sub { margin: 0; color: var(--muted); font-size: 0.9rem; }

.st-panel-hello { margin: 0 0 4px; font-weight: 700; font-size: 0.95rem; }

.st-next-card {
  border: 1px solid var(--iv-5);
  border-radius: var(--radius);
  background: rgba(34, 197, 94, 0.07);
  padding: 18px 20px;
  margin-bottom: 22px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}
.st-next-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--iv-5);
}
.st-next-title { margin: 0; font-size: 1.15rem; line-height: 1.25; }
.st-next-intro { margin: 0; font-size: 0.9rem; line-height: 1.5; }
.st-next-meta { margin: 0; font-size: 0.8rem; color: var(--muted); }
.st-next-card .primary-btn { margin-top: 4px; }

.st-next-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }

.st-section-title {
  margin: 0 0 10px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

/* The footnote that replaced the sign-in card. Quiet by design: it answers a
   question rather than asking one. */
.st-account-note {
  margin: 22px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--muted);
}
.st-account-link { color: var(--iv-5); font-weight: 600; }

/* ---------- User Guide ---------- */

.guide-toc { display: flex; flex-direction: column; gap: 2px; }

.guide-toc-link {
  display: block;
  padding: 7px 10px;
  border-radius: 8px;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 600;
  transition: background 120ms ease, color 120ms ease;
}

.guide-toc-link:hover { background: var(--bg); color: var(--accent); }

.guide-panel {
  display: flex;
  flex-direction: column;
  gap: 26px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 26px;
}

.guide-section-title {
  margin: 0 0 4px;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--accent);
  scroll-margin-top: 18px;
}

.guide-item {
  padding: 12px 0 0;
  border-top: 1px solid var(--border);
  margin-top: 12px;
}

.guide-item:first-of-type { border-top: none; margin-top: 6px; padding-top: 0; }

.guide-item h4 {
  margin: 0 0 4px;
  font-size: 0.92rem;
}

.guide-item p {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.6;
  max-width: 68ch;
}

.guide-item p strong { color: var(--text); }

/* ==========================================================================
   Membership — header auth area, sign-in modal, locked panel, admin page
   ========================================================================== */

/* Header sign-in button / user chip */
.app-header { position: relative; }

.auth-area {
  position: absolute;
  top: 38px;
  right: 28px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.user-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 8px 6px 14px;
}

.user-chip-name {
  font-weight: 700;
  font-size: 0.88rem;
  max-width: 160px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.role-badge {
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 3px 9px;
  white-space: nowrap;
  text-decoration: none;
}

a.role-badge:hover { background: var(--accent); color: var(--bg); }

/* Sign-in / sign-up modal */
.auth-modal {
  position: fixed;
  inset: 0;
  z-index: 80; /* above .teacher-note-panel (60) */
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.auth-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
}

.auth-panel {
  position: relative;
  width: min(380px, 100%);
  max-height: calc(100vh - 40px);
  overflow-y: auto;
  background: var(--panel);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  padding: 22px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.auth-panel h2 { margin: 0; font-size: 1.2rem; }

.auth-panel label {
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
}

.auth-panel input[type="email"],
.auth-panel input[type="password"],
.auth-panel input[type="text"],
.auth-panel select {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 10px;
  font: inherit;
  font-size: 0.9rem;
}

.auth-panel input:focus,
.auth-panel select:focus { outline: none; border-color: var(--accent); }

.auth-signup-fields { display: flex; flex-direction: column; gap: 14px; }

.auth-panel fieldset {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
}

.auth-panel legend {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--muted);
  padding: 0 4px;
}

.auth-panel fieldset label {
  flex-direction: row;
  align-items: center;
  gap: 6px;
  color: var(--text);
  font-weight: 600;
  font-size: 0.85rem;
}

.auth-panel fieldset .helper-text { flex-basis: 100%; }

.auth-close {
  position: absolute;
  top: 10px;
  right: 12px;
  appearance: none;
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 1.3rem;
  line-height: 1;
  cursor: pointer;
  padding: 4px;
}
.auth-close:hover { color: var(--text); }

.auth-error {
  margin: 0;
  min-height: 1.1em;
  color: var(--iv-root);
  font-size: 0.82rem;
  font-weight: 600;
}

.link-btn {
  appearance: none;
  background: transparent;
  border: none;
  color: var(--accent);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
}
.link-btn:hover { color: var(--text); }

/* Locked Teacher-tab panel */
.locked-note {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 0.88rem;
}
.locked-note .lock-icon { font-size: 1.1rem; line-height: 1.3; }

/* ---------- Admin page ---------- */

.admin-shell {
  max-width: 1100px;
  margin: 0 auto 40px;
  padding: 0 28px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.admin-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.admin-card h2 { margin: 0; font-size: 1.05rem; }

.admin-note {
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.83rem;
  color: var(--text);
}

.admin-note code {
  font-family: var(--font-mono);
  color: var(--accent);
}

/* The unrun-migration notice above the user table. Same shape as the note it
   sits beside, with room for a list. */
.admin-note.warn { margin-bottom: 14px; }
.admin-note.warn ul { margin: 8px 0 0; padding-left: 20px; }
.admin-note.warn li { margin-bottom: 6px; line-height: 1.5; }
.admin-note.warn p { margin: 10px 0 0; }

.admin-table-wrap { overflow-x: auto; }

.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.admin-table th {
  text-align: left;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--panel-2);
  padding: 9px 10px;
  white-space: nowrap;
}

.admin-table td {
  padding: 8px 10px;
  border-top: 1px solid var(--border);
  vertical-align: middle;
  white-space: nowrap;
}

.admin-table select,
.admin-table input[type="text"] {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 8px;
  font: inherit;
  font-size: 0.82rem;
}

.pill {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  border-radius: 999px;
  padding: 3px 10px;
  border: 1px solid var(--border);
  color: var(--muted);
}
.pill.ok { color: var(--iv-5); border-color: var(--iv-5); }
.pill.warn { color: var(--accent); border-color: var(--accent); }
.pill.bad { color: var(--iv-root); border-color: var(--iv-root); }

.admin-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 340px;
}

.admin-form label {
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
}

.admin-form input {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 10px;
  font: inherit;
}
.admin-form input:focus { outline: none; border-color: var(--accent); }

.ent-rule {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
}

.ent-rule label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
}

.ent-rule select {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 8px;
  font: inherit;
  font-size: 0.82rem;
}

/* The plain-English reading of a row of tick boxes, pushed to the far end of
   the rule so it lines up down the list and can be scanned on its own. */
.ent-rule-summary {
  margin-left: auto;
  font-weight: 600;
  color: var(--muted);
}

/* The "which teacher?" select that appears beside an account set to Student. */
.admin-inline-select { margin-left: 6px; }
.admin-inline-select.hidden { display: none; }

.admin-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.admin-save-status { font-size: 0.8rem; color: var(--iv-5); font-weight: 600; }

@media (max-width: 640px) {
  .auth-area { position: static; margin-top: 12px; }
}