:root {
    /* Warm cream paper palette + teal-green accent */
    --bg-color: #F7F4EB;
    --bg-elev: #FCFAF3;
    --bg-soft: #EDE9DD;
    --text-primary: #2C2C2C;
    --text-secondary: #6B6B6B;
    --text-muted: #9A9690;
    --accent-color: #2EA39B;
    --accent-hover: #258A82;
    --accent-soft: rgba(46, 163, 155, 0.1);
    --glass-bg: #FCFAF3;
    --glass-border: #E0DCD0;
    --glass-border-strong: #C8C3B4;
    --warn-color: #E68B30;
    --success-color: #2EA39B;
    --vivid-purple: #8B5CF6;
    --vivid-orange: #E68B30;
    --vivid-green: #2EA39B;
    --vivid-blue: #3B82F6;
    --vivid-red: #D24545;
    --canvas-bg: #FFFEF9;
    --canvas-grid: rgba(0, 0, 0, 0.06);
    --canvas-text: #2C2C2C;
    --canvas-text-muted: #6B6B6B;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "ヒラギノ角ゴ ProN W3", "メイリオ", Meiryo, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 24px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.6;
}

.app-container {
    width: 100%;
    max-width: 1100px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

header {
    display: flex;
    align-items: baseline;
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 6px 12px;
    margin-bottom: 0;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--glass-border);
    position: relative;
}

.bmc-link {
    position: absolute;
    top: 0;
    right: 0;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.75rem;
    padding: 4px 10px;
    border: 1px solid var(--glass-border);
    border-radius: 999px;
    transition: all 0.15s;
    background: var(--bg-elev);
}

.bmc-link:hover {
    color: var(--accent-color);
    border-color: var(--accent-color);
    background: var(--accent-soft);
}

header h1 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    line-height: 1.3;
    letter-spacing: -0.01em;
}

header p {
    color: var(--text-muted);
    font-size: 0.8rem;
    margin: 0;
    font-weight: 400;
}

.dashboard {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
    gap: 24px;
    grid-template-areas:
        "visualizer visualizer"
        "source filter";
    align-items: start;
}

.glass {
    background: var(--bg-elev);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 20px;
}

.panel h2 {
    font-size: 0.95rem;
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--glass-border);
    color: var(--text-primary);
    font-weight: 700;
    letter-spacing: 0;
}

.source-panel {
    grid-area: source;
}

.filter-panel {
    grid-area: filter;
}

.visualizer-panel {
    grid-area: visualizer;
    position: sticky;
    top: 12px;
    z-index: 5;
    padding: 16px 20px;
}

/* When Roughness legend is open, drop sticky so the (now tall) panel scrolls normally
   with the page — otherwise it stays glued to the viewport top and blocks the f₀ slider below. */
.visualizer-panel:has(#roughness-toggle.roughness-active) {
    position: relative;
    top: auto;
}

/* Controls */
.control-group,
.formant-control {
    margin-bottom: 24px;
}

.control-group label:first-child,
.label-row label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 0.95rem;
}

span[id$="-val"] {
    color: var(--text-primary);
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    font-size: 0.9em;
    font-weight: 600;
}

.control-group > label:first-child span[id$="-val"] {
    float: right;
}

/* Pitch header: label on left, Voice Type compact toggle + range hint on right */
.pitch-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 6px;
}

.pitch-header .label-main {
    flex: 1;
    min-width: 0;
    margin-bottom: 0;
    display: block;
    font-weight: 600;
    font-size: 0.95rem;
}

.pitch-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 4px;
    flex: 0 0 auto;
}

.pitch-meta .range-hint {
    font-size: 0.68rem;
    color: var(--text-muted);
    font-weight: 500;
    line-height: 1;
}

/* Compact 2-segment toggle (Treble / Non-Treble) */
.voice-type-compact {
    display: inline-flex;
    background: var(--bg-soft);
    border: 1px solid var(--glass-border);
    border-radius: 6px;
    padding: 2px;
    gap: 0;
}

.voice-type-compact input[type="radio"] {
    display: none;
}

.voice-type-compact label {
    padding: 3px 10px;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 4px;
    transition: background 0.15s, color 0.15s;
    margin: 0;
    line-height: 1.3;
    white-space: nowrap;
}

.voice-type-compact input[type="radio"]:checked + label {
    background: var(--bg-elev);
    color: var(--accent-color);
    box-shadow: 0 1px 2px rgba(28, 24, 16, 0.08);
}

/* Custom Range Sliders */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    background: transparent;
    margin: 10px 0;
}

input[type=range]:focus {
    outline: none;
}

input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 4px;
    cursor: pointer;
    background: var(--glass-border);
    border-radius: 999px;
    border: none;
}

input[type=range]::-moz-range-track {
    height: 4px;
    background: var(--glass-border);
    border-radius: 999px;
    border: none;
}

.canvas-container {
    width: 100%;
    height: 250px;
    background: var(--canvas-bg);
    border-radius: 6px;
    overflow: hidden;
    position: relative;
    border: 1px solid var(--glass-border);
}

#spectrum-canvas {
    width: 100%;
    height: 100%;
    cursor: crosshair;
}

#spectrum-canvas.grabbing {
    cursor: grabbing;
}

input[type=range]::-webkit-slider-thumb {
    height: 16px;
    width: 16px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    -webkit-appearance: none;
    margin-top: -6px;
    border: 2px solid var(--bg-elev);
    transition: transform 0.1s;
}

input[type=range]::-moz-range-thumb {
    height: 16px;
    width: 16px;
    border-radius: 50%;
    background: var(--accent-color);
    border: 2px solid var(--bg-elev);
    cursor: pointer;
}

input[type=range]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* Formant control rows */
.formant-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 6px;
}

.formant-label {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text-primary);
    flex-shrink: 0;
}

.formant-val {
    background: var(--bg-soft);
    border-radius: 6px;
    padding: 2px 8px;
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    font-size: 0.8rem;
    color: var(--text-primary);
    font-weight: 600;
    flex: 0 0 auto;
}

.formant-val > span[id$="-val"] {
    color: var(--text-primary);
}

.formant-row .toggle-btn {
    margin-left: auto;
}

.q-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    margin-top: 6px;
    font-size: 0.78rem;
    color: var(--text-muted);
}

.q-hint {
    flex-basis: 100%;
    font-size: 0.68rem;
    color: var(--text-muted);
    line-height: 1.3;
    margin-left: 22px;
}

.q-label {
    font-weight: 600;
    color: var(--text-secondary);
    min-width: 14px;
}

.q-val {
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    font-weight: 600;
    color: var(--text-secondary);
    min-width: 32px;
    text-align: right;
    font-size: 0.78rem;
}

.q-row input[type=range] {
    flex: 1;
    margin: 0;
}

.q-row input[type=range]::-webkit-slider-thumb {
    height: 12px;
    width: 12px;
    margin-top: -4px;
    background: var(--text-muted);
    border: 2px solid var(--bg-elev);
}

.q-row input[type=range]::-moz-range-thumb {
    height: 12px;
    width: 12px;
    background: var(--text-muted);
    border: 2px solid var(--bg-elev);
}

/* Toggle Switch (Radio Buttons) */
.toggle-switch {
    display: flex;
    background: var(--bg-soft);
    border-radius: 999px;
    overflow: hidden;
    border: 1px solid var(--glass-border);
    padding: 2px;
    gap: 2px;
}

.toggle-switch input[type="radio"] {
    display: none;
}

.toggle-switch label {
    flex: 1;
    text-align: center;
    padding: 6px 12px;
    cursor: pointer;
    transition: all 0.15s;
    font-size: 0.85rem;
    margin: 0 !important;
    border-radius: 999px;
    color: var(--text-secondary);
}

.toggle-switch input[type="radio"]:checked+label {
    background: var(--text-primary);
    color: #fff;
    font-weight: 600;
}

.hint {
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-top: 4px;
    line-height: 1.3;
}

.notes-display {
    text-align: right;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Aerodynamic Status Panel */
.status-panel {
    margin-top: 16px;
    padding: 12px 14px;
    background: var(--bg-soft);
    border-radius: 6px;
    border: 1px solid var(--glass-border);
}

/* Subsection grouping (e.g. Phonation = P + R + Status) — wraps content in a grey box */
.subsection {
    margin-top: 20px;
    padding: 14px;
    background: var(--bg-soft);
    border: 1px solid var(--glass-border);
    border-radius: 6px;
}

.subsection-title {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin: 0 0 12px;
    padding: 0;
    border: none;
}

.subsection > .control-group {
    margin-bottom: 16px;
}

.subsection > .control-group:last-of-type {
    margin-bottom: 0;
}

/* status-panel inside a subsection: drop its own box, use a top divider instead */
.subsection > .status-panel {
    margin-top: 14px;
    padding: 12px 0 0;
    background: transparent;
    border: none;
    border-top: 1px solid var(--glass-border);
    border-radius: 0;
}

/* Phonation collapsible — mirror Vibrato panel pattern */
.phonation-subsection {
    margin-top: 20px;
}
.phonation-subsection .collapsible-body > .control-group {
    margin-bottom: 16px;
}
.phonation-subsection .collapsible-body > .control-group:last-of-type {
    margin-bottom: 12px;
}
.phonation-subsection .collapsible-body > .status-panel {
    margin: 12px 0 0;
    padding: 12px 0 0;
    background: transparent;
    border: none;
    border-top: 1px solid var(--glass-border);
    border-radius: 0;
}
.phonation-summary-badge {
    margin-left: auto;
}

.status-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.status-row:last-child {
    margin-bottom: 0;
}

.status-row .mono {
    font-family: monospace;
    color: var(--text-primary);
    font-size: 1.1em;
}

.status-badge {
    padding: 3px 10px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.75rem;
    letter-spacing: 0;
    background: var(--bg-soft);
    color: var(--text-secondary);
    border: 1px solid var(--glass-border);
}

.status-badge.flow {
    background: var(--accent-soft);
    color: var(--accent-hover);
    border-color: rgba(46, 163, 155, 0.3);
}

.status-badge.pressed {
    background: rgba(210, 69, 69, 0.08);
    color: #B83838;
    border-color: rgba(210, 69, 69, 0.3);
}

.status-badge.breathy {
    background: rgba(59, 130, 246, 0.08);
    color: #2563EB;
    border-color: rgba(59, 130, 246, 0.3);
}

.status-badge.yell {
    background: rgba(230, 139, 48, 0.1);
    color: #B86F2A;
    border-color: rgba(230, 139, 48, 0.3);
}

.status-badge.whoop {
    background: rgba(139, 92, 246, 0.08);
    color: #6D28D9;
    border-color: rgba(139, 92, 246, 0.3);
}

.status-badge.neutral {
    background: var(--bg-soft);
    color: var(--text-secondary);
    border-color: var(--glass-border);
}

.status-badge.open {
    background: var(--accent-soft);
    color: var(--accent-hover);
    border-color: rgba(46, 163, 155, 0.3);
}

.status-badge.close {
    background: rgba(139, 92, 246, 0.08);
    color: #6D28D9;
    border-color: rgba(139, 92, 246, 0.3);
}

.tooltip {
    position: relative;
    display: inline-block;
    margin-left: 4px;
    font-size: 0.7rem;
    color: var(--text-muted);
    cursor: help;
    background: transparent;
    border-radius: 50%;
    width: 14px;
    height: 14px;
    line-height: 13px;
    text-align: center;
    border: 1px solid var(--glass-border);
    vertical-align: middle;
}

.tooltip:hover {
    color: var(--accent-color);
    border-color: var(--accent-color);
    background: var(--accent-soft);
}

/* Custom Instant Tooltip */
.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 150%;
    left: 50%;
    transform: translateX(-50%);
    width: max-content;
    max-width: 280px;
    background: #2C2C2C;
    color: #FFFFFF;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.8rem;
    line-height: 1.5;
    text-align: left;
    white-space: pre-wrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease;
    z-index: 1000;
}

.tooltip::before {
    content: '';
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    border-width: 5px;
    border-style: solid;
    border-color: #2C2C2C transparent transparent transparent;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease;
    z-index: 1000;
}

.tooltip:hover::after {
    opacity: 1;
    transform: translateX(-50%) translateY(-2px);
}

.tooltip:hover::before {
    opacity: 1;
}

/* Acoustic Strategy Tracker */
.acoustic-tracker {
    margin-top: 15px;
    padding: 15px;
    border-radius: 8px;
    position: relative;
}

.tracker-title {
    font-size: 0.85rem;
    color: var(--text-primary);
    margin-bottom: 0;
    text-transform: none;
    letter-spacing: 0;
    border-bottom: none;
    padding-bottom: 0;
    font-weight: 700;
}

/* Glottal Waveform */
.glottal-canvas-container {
    width: 100%;
    height: 120px;
    background: var(--canvas-bg);
    border-radius: 6px;
    border: 1px solid var(--glass-border);
    overflow: hidden;
    margin-bottom: 4px;
}

.glottal-canvas-deriv-container {
    height: 100px;
    margin-bottom: 8px;
}

.glottal-canvas-container canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.glottal-legend {
    display: flex;
    justify-content: center;
    gap: 16px;
    font-size: 0.75rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 3px 8px;
    border-radius: 4px;
    font-weight: 600;
    letter-spacing: 0.3px;
}

.open-legend {
    color: #4A8A4A;
    background: rgba(111, 174, 111, 0.12);
    border: 1px solid rgba(111, 174, 111, 0.4);
}

.return-legend {
    color: #C44545;
    background: rgba(229, 91, 91, 0.12);
    border: 1px solid rgba(229, 91, 91, 0.4);
}

.closed-legend {
    color: var(--accent-hover);
    background: rgba(33, 150, 243, 0.12);
    border: 1px solid rgba(33, 150, 243, 0.4);
}

/* Guide Toggle Button — matches [?] tooltip style */
.guide-toggle {
    display: inline-block;
    margin-left: 2px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    cursor: pointer;
    background: none;
    border-radius: 3px;
    padding: 0;
    border: none;
    vertical-align: middle;
    transition: color 0.2s;
}

.guide-toggle:hover {
    color: var(--text-primary);
}

.guide-toggle.active {
    color: var(--accent-color);
}

/* Guide Panel */
.lf-guide-panel {
    background: var(--bg-soft);
    border: 1px solid var(--glass-border);
    border-radius: 6px;
    padding: 14px;
    margin-bottom: 10px;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-4px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.guide-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.75rem;
    margin-bottom: 12px;
}

.guide-table th {
    text-align: left;
    padding: 6px 8px;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--glass-border);
    font-weight: 600;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.guide-table td {
    padding: 6px 8px;
    border-bottom: 1px solid var(--glass-border);
    color: var(--text-primary);
    vertical-align: top;
    line-height: 1.5;
}

.guide-table td:first-child {
    color: var(--text-primary);
    font-weight: 600;
    white-space: nowrap;
}

.guide-table td small {
    color: var(--text-muted);
    font-size: 0.65rem;
}

.guide-subtitle {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-weight: 600;
}

.rd-scale {
    display: flex;
    gap: 3px;
    border-radius: 6px;
    overflow: hidden;
}

.rd-level {
    flex: 1;
    padding: 6px 4px;
    text-align: center;
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.3;
}

.rd-level small {
    font-weight: 400;
    font-size: 0.6rem;
    opacity: 0.75;
}

.rd-level.pressed-strong {
    background: rgba(229, 91, 91, 0.18);
    border: 1px solid rgba(229, 91, 91, 0.45);
}

.rd-level.pressed-mild {
    background: rgba(240, 165, 85, 0.18);
    border: 1px solid rgba(240, 165, 85, 0.4);
}

.rd-level.modal {
    background: rgba(111, 174, 111, 0.2);
    border: 1px solid rgba(111, 174, 111, 0.5);
}

.rd-level.breathy-mild {
    background: rgba(33, 150, 243, 0.15);
    border: 1px solid rgba(33, 150, 243, 0.4);
}

.rd-level.breathy-strong {
    background: rgba(184, 85, 240, 0.15);
    border: 1px solid rgba(184, 85, 240, 0.4);
}

.ref-tooltip {
    font-size: 0.7rem;
    color: var(--text-muted);
    cursor: help;
    background: var(--bg-soft);
    border: 1px solid var(--glass-border);
    border-radius: 999px;
    padding: 2px 10px;
    white-space: nowrap;
}

.ref-tooltip:hover {
    color: var(--accent-color);
    border-color: var(--accent-color);
    background: var(--accent-soft);
}

.ref-tooltip::after {
    max-width: 460px;
    left: auto;
    right: 0;
    transform: none;
    white-space: pre-line;
}

.ref-tooltip:hover::after {
    transform: translateY(-2px);
}

.glottal-params {
    display: flex;
    justify-content: space-around;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.glottal-params .mono {
    color: var(--accent-hover);
    font-family: monospace;
    font-size: 0.85rem;
}

.event-flash {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    color: #000;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.1rem;
    letter-spacing: 1px;
    opacity: 0;
    pointer-events: none;
}

.event-flash.flash-anim {
    animation: flashOut 1.5s ease-out forwards;
}

.event-flash.hidden {
    display: none;
}

@keyframes flashOut {
    0% {
        opacity: 1;
        transform: scale(1);
    }

    20% {
        opacity: 1;
        transform: scale(1.05);
    }

    100% {
        opacity: 0;
        transform: scale(1);
        display: none;
    }
}

/* Buttons */
.btn {
    padding: 7px 14px;
    border-radius: 999px;
    border: 1px solid var(--glass-border);
    background: var(--bg-elev);
    color: var(--text-primary);
    font-family: inherit;
    font-weight: 500;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.15s ease;
    line-height: 1.4;
}

.btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    background: var(--accent-soft);
}

.btn.primary {
    background-color: var(--accent-color);
    color: #fff;
    border-color: var(--accent-color);
    font-size: 0.9rem;
    font-weight: 700;
    padding: 8px 20px;
}

.btn.primary:hover {
    background-color: var(--accent-hover);
    border-color: var(--accent-hover);
    color: #fff;
}

.btn.primary.playing {
    background-color: var(--vivid-orange);
    border-color: var(--vivid-orange);
    color: #fff;
}

.btn.primary.playing:hover {
    background-color: #C97520;
    border-color: #C97520;
    color: #fff;
}

.btn.mic-active {
    background-color: var(--vivid-red);
    color: #fff;
    border-color: var(--vivid-red);
}

/* Mic toggle (PC) — pill with icon + text, matches Learn / Play family */
.btn-mic-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    line-height: 1;
    font-weight: 600;
}
.btn-mic-icon svg {
    flex-shrink: 0;
    opacity: 0.9;
}

.btn-mic-icon:focus {
    outline: none;
}

.btn-mic-icon:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 1px;
}

.btn.mic-active:hover {
    background-color: #B83838;
    border-color: #B83838;
    color: #fff;
}

@keyframes pulseMic {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.btn.mic-paused {
    background-color: var(--vivid-red);
    color: #fff;
    border-color: var(--vivid-red);
    opacity: 0.7;
}

.vowel-presets,
.preset-group {
    display: flex;
    flex-wrap: wrap;
    /* Added to handle 5 vowels + 2 timbres gracefully */
    gap: 10px;
    align-items: center;
    margin-top: 20px;
    font-size: 0.9rem;
}

.preset-btn {
    background: var(--bg-elev);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 5px 12px;
    border-radius: 999px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.8rem;
    font-weight: 500;
    transition: all 0.15s;
}

.preset-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    background: var(--accent-soft);
}

/* Canvas Header — 2-row compact layout */
.canvas-header {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 14px;
}

.canvas-header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    min-width: 0;
}

.canvas-header-bottom {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
}

.canvas-header h2 {
    margin-bottom: 0;
    border: none;
    white-space: nowrap;
    font-size: 0.95rem;
    cursor: help;
    color: var(--text-primary);
    font-weight: 700;
    padding-bottom: 0;
}

.canvas-title-block {
    display: flex;
    align-items: center;
    gap: 18px;
    flex-wrap: wrap;
    min-width: 0;
}

.canvas-primary-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.btn.btn-icon {
    padding: 6px 10px !important;
    font-size: 1rem !important;
    line-height: 1;
}

.control-divider {
    width: 1px;
    align-self: stretch;
    background: var(--glass-border);
    margin: 0 4px;
}

/* Mic-controls: hidden when mic is OFF */
.mic-controls {
    display: none;
    align-items: center;
    gap: 8px;
}

/* mic-toggle is now in canvas-primary-actions (sibling of mic-controls' grandparent),
   so query at the canvas-header level which is the common ancestor */
.canvas-header:has(#mic-toggle.mic-active) .mic-controls {
    display: inline-flex;
}

.strategy-strip {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 16px;
    font-size: 0.85rem;
}

.strategy-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    white-space: nowrap;
}

.strategy-item .strategy-label {
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.8rem;
}

.strategy-strip .status-badge {
    font-size: 0.9rem;
    padding: 6px 14px;
    font-weight: 700;
    border-radius: 6px;
    min-width: 80px;
    text-align: center;
    display: inline-block;
    line-height: 1.3;
}

.strategy-strip .toggle-checkbox {
    cursor: pointer;
    user-select: none;
}

.strategy-strip .label-text {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.canvas-controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
}

.canvas-control-group {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 12px;
    background: var(--bg-soft);
    border: 1px solid var(--glass-border);
    border-radius: 999px;
}

.canvas-control-group label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    white-space: nowrap;
    margin: 0;
    font-weight: 500;
}

.canvas-control-group input[type="range"] {
    width: 80px;
    margin: 0;
    height: 4px;
}

.control-val {
    font-size: 0.75rem;
    color: var(--text-primary);
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    background: transparent;
    padding: 0;
    border-radius: 4px;
    min-width: 36px;
    text-align: right;
    white-space: nowrap;
    font-weight: 600;
}

.canvas-control-buttons {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-sm {
    padding: 6px 12px !important;
    font-size: 0.8rem !important;
    border-radius: 6px !important;
}

.btn.slope-line-active,
.inline-toggle-btn.slope-line-active,
.btn.log-active,
.axis-scale-btn.log-active,
.inline-toggle-btn.roughness-active {
    background-color: var(--accent-color);
    color: #fff;
    border-color: var(--accent-color);
}

/* Roughness educational legend below spectrum */
.roughness-legend {
    margin-top: 12px;
    padding: 12px 14px;
    background: var(--bg-soft);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    font-size: 0.78rem;
    color: var(--text-primary);
}
.rl-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px 10px;
    margin-bottom: 10px;
    padding-bottom: 8px;
    border-bottom: 1px dashed var(--glass-border);
}
.rl-header-label {
    font-size: 0.78rem;
    color: var(--text-secondary);
}
.rl-f0 {
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    font-weight: 700;
    font-size: 0.92rem;
    color: var(--accent-color);
}
.rl-erb-block {
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    font-size: 0.75rem;
    color: var(--text-primary);
    background: rgba(33, 150, 243, 0.08);
    border: 1px solid rgba(33, 150, 243, 0.25);
    padding: 3px 8px;
    border-radius: 5px;
    line-height: 1.4;
}
.rl-erb-block .rl-erb-key {
    color: var(--text-secondary);
    margin-right: 4px;
}
.rl-erb-block .rl-erb-val {
    font-weight: 700;
}
.rl-erb-block .rl-erb-sep {
    color: var(--text-secondary);
    margin: 0 8px;
    opacity: 0.5;
}
.rl-pitch-mirror {
    flex: 0 0 180px;
    height: 4px;
    margin: 0 0 0 14px;  /* nudged right */
}
.rl-line-break {
    flex-basis: 100%;
    height: 0;
}
.rl-term {
    font-size: 0.72rem;
    line-height: 1.4;
    padding: 3px 8px;
    border-radius: 5px;
    color: var(--text-primary);
    background: rgba(0, 0, 0, 0.04);
    border: 1px solid var(--glass-border);
}
.rl-term strong {
    font-weight: 700;
}
.rl-term-roughness strong { color: #d97d1f; }
.rl-term-resolution strong { color: #2e9c64; }
.rl-header-hint {
    font-size: 0.7rem;
    color: var(--text-secondary);
    margin-left: auto;
    white-space: nowrap;
}
.rl-zones {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}
.rl-zone {
    padding: 8px 10px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.5);
    border-left: 3px solid transparent;
    line-height: 1.45;
}
.rl-zone-head {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 4px;
}
.rl-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
}
.rl-name {
    font-weight: 700;
    font-size: 0.82rem;
}
.rl-cond {
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    font-size: 0.7rem;
    color: var(--text-secondary);
    background: rgba(0,0,0,0.04);
    padding: 3px 6px;
    border-radius: 4px;
    margin-bottom: 4px;
    line-height: 1.4;
}
.rl-range {
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 4px;
}
.rl-desc {
    font-size: 0.74rem;
    color: var(--text-secondary);
}
.rl-empty-note {
    margin-top: 6px;
    padding: 6px 8px;
    background: rgba(217, 125, 31, 0.08);
    border: 1px dashed rgba(217, 125, 31, 0.4);
    border-radius: 5px;
    font-size: 0.7rem;
    color: #8b5a1f;
    line-height: 1.5;
}
.rl-pure       { border-left-color: rgba(33, 150, 243, 0.95); }
.rl-pure       .rl-dot, .rl-pure .rl-name { color: #2196f3; }
.rl-pure       .rl-dot { background: #2196f3; }
.rl-rough-res  { border-left-color: rgba(217, 125, 31, 0.95); }
.rl-rough-res  .rl-dot, .rl-rough-res .rl-name { color: #d97d1f; }
.rl-rough-res  .rl-dot { background: #d97d1f; }
.rl-rough-unr  { border-left-color: rgba(210, 69, 69, 0.95); }
.rl-rough-unr  .rl-dot, .rl-rough-unr .rl-name { color: #d24545; }
.rl-rough-unr  .rl-dot { background: #d24545; }
.rl-ceiling    { border-left-color: rgba(120, 120, 120, 0.95); }
.rl-ceiling    .rl-dot, .rl-ceiling .rl-name { color: #888; }
.rl-ceiling    .rl-dot { background: #888; }
.rl-interval-table {
    margin-top: 10px;
    padding-top: 8px;
    border-top: 1px dashed var(--glass-border);
}
.rl-interval-title {
    font-size: 0.74rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}
.rl-interval-grid {
    display: grid;
    grid-template-columns: repeat(10, minmax(0, 1fr));
    gap: 4px;
}
.rl-cell {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 4px 2px;
    background: rgba(0,0,0,0.03);
    border-radius: 4px;
    font-size: 0.68rem;
    line-height: 1.3;
}
.rl-cell-edge {
    background: rgba(217, 125, 31, 0.12);
    border: 1px solid rgba(217, 125, 31, 0.35);
}
.rl-cell-h {
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    color: var(--text-secondary);
    font-size: 0.62rem;
}
.rl-cell-c {
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    font-weight: 700;
    color: var(--text-primary);
    font-size: 0.78rem;
}
.rl-cell-n {
    font-size: 0.62rem;
    color: var(--text-secondary);
}
@media (max-width: 900px) {
    .rl-interval-grid { grid-template-columns: repeat(5, minmax(0, 1fr)); }
}
/* "詳細解説" collapsible */
.rl-deep {
    margin-top: 12px;
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    overflow: hidden;
}
.rl-deep-summary {
    list-style: none;
    cursor: pointer;
    padding: 8px 12px;
    background: rgba(0, 0, 0, 0.03);
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-primary);
    user-select: none;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: background 0.15s;
}
.rl-deep-summary::-webkit-details-marker { display: none; }
.rl-deep-summary::before {
    content: "▸";
    font-size: 0.7rem;
    color: var(--text-secondary);
    transition: transform 0.2s;
    display: inline-block;
}
.rl-deep[open] > .rl-deep-summary::before { transform: rotate(90deg); }
.rl-deep-summary:hover { background: rgba(0, 0, 0, 0.05); }
.rl-deep-body {
    padding: 10px 14px 12px;
    background: rgba(255, 255, 255, 0.4);
    border-top: 1px solid var(--glass-border);
}
.rl-deep-section + .rl-deep-section {
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px dashed var(--glass-border);
}
.rl-deep-h {
    margin: 0 0 6px 0;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-primary);
}
.rl-deep-list {
    margin: 0 0 6px 0;
    padding-left: 18px;
    font-size: 0.74rem;
    color: var(--text-primary);
    line-height: 1.55;
}
.rl-deep-list li { margin-bottom: 4px; }
.rl-deep-list li:last-child { margin-bottom: 0; }
.rl-deep-p {
    margin: 0 0 5px 0;
    font-size: 0.74rem;
    color: var(--text-primary);
    line-height: 1.55;
}
.rl-deep-p:last-child { margin-bottom: 0; }
.rl-deep-meta {
    color: var(--text-secondary);
    font-size: 0.7rem;
}
.rl-deep-body code {
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    background: rgba(0, 0, 0, 0.05);
    padding: 1px 6px;
    border-radius: 3px;
    font-size: 0.78rem;
}
@media (max-width: 900px) {
    .rl-zones { grid-template-columns: repeat(2, 1fr); }
}


/* Slope: small inner pill inside its canvas-control-group */
#slope-line-toggle {
    padding: 4px 14px;
    font-size: 0.78rem;
    line-height: 1.4;
    min-width: 60px;
    text-align: center;
}

/* Rough: standalone pill sized to match Volume/Slope group outer height */
#roughness-toggle {
    padding: 8px 22px;
    font-size: 0.78rem;
    line-height: 1.4;
    min-width: 76px;
    text-align: center;
}

/* Rough wrapper: drop the outer pill so the button itself is the single visible layer */
.canvas-control-group:has(#roughness-toggle) {
    background: transparent;
    border-color: transparent;
    padding: 0;
}

/* Inline toggle inside canvas-control-group */
.inline-toggle-btn {
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    padding: 2px 10px;
    border-radius: 999px;
    cursor: pointer;
    font-size: 0.72rem;
    font-family: inherit;
    font-weight: 600;
    transition: all 0.15s;
    margin-left: 4px;
}

.inline-toggle-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    background: var(--accent-soft);
}

/* Log toggle floating on canvas, near X-axis */
.axis-scale-btn {
    position: absolute;
    bottom: 22px;
    right: 8px;
    background: var(--bg-elev);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    padding: 2px 10px;
    border-radius: 999px;
    cursor: pointer;
    font-size: 0.7rem;
    font-family: inherit;
    font-weight: 600;
    line-height: 1.4;
    transition: all 0.15s;
    z-index: 2;
}

.axis-scale-btn:hover {
    color: var(--accent-color);
    border-color: var(--accent-color);
    background: var(--accent-soft);
}

/* Fullscreen mode for Power Spectrum panel */
.visualizer-panel.is-fullscreen {
    position: fixed;
    inset: 0;
    z-index: 9999;
    border-radius: 0;
    display: flex;
    flex-direction: column;
    background: var(--bg-color);
    padding: 16px 24px;
    overflow: hidden;
}

.visualizer-panel.is-fullscreen .canvas-container {
    flex: 1;
    height: auto;
}

.visualizer-panel.is-fullscreen #spectrum-fullscreen-btn {
    background-color: var(--accent-color);
    color: #fff;
    border-color: var(--accent-color);
    box-shadow: 0 2px 8px rgba(33, 150, 243, 0.4);
}

.canvas-container {
    position: relative;
    width: 100%;
    height: 300px;
    background: var(--canvas-bg);
    border-radius: 8px;
    border: 1px solid var(--glass-border);
    overflow: hidden;
}

canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.axis-labels {
    position: absolute;
    bottom: 5px;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    padding: 0 10px;
    pointer-events: none;
}

.axis-labels span {
    font-size: 0.75rem;
    color: var(--canvas-text-muted);
    font-family: monospace;
}

/* Collapsible (details/summary) — outer box matches .status-panel */
.collapsible {
    margin-top: 12px;
    padding: 0;
    background: var(--bg-soft);
    border: 1px solid var(--glass-border);
    border-radius: 6px;
    transition: border-color 0.15s;
}

.collapsible:hover {
    border-color: var(--accent-color);
}

.collapsible > .collapsible-summary {
    list-style: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: 6px;
    user-select: none;
}

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

.collapsible > .collapsible-summary::after {
    content: "▾";
    color: var(--accent-color);
    font-size: 0.9rem;
    font-weight: 700;
    transition: transform 0.2s ease;
    display: inline-block;
    flex: 0 0 auto;
    line-height: 1;
}

.collapsible[open] > .collapsible-summary::after {
    transform: rotate(180deg);
}

.collapsible[open] > .collapsible-summary {
    border-bottom: 1px solid var(--glass-border);
    border-radius: 6px 6px 0 0;
}

.collapsible > .collapsible-summary .tracker-title {
    margin: 0;
    flex: 1;
    min-width: 0;
}

.collapsible-body {
    padding: 12px 14px;
}

/* Vibrato panel */
.vibrato-panel {
    margin-top: 12px;
}

.vibrato-grid {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.vibrato-row {
    display: grid;
    grid-template-columns: 110px 1fr 70px;
    grid-template-rows: auto auto;
    align-items: center;
    column-gap: 10px;
    row-gap: 2px;
    font-size: 0.82rem;
}

.vibrato-hint {
    grid-column: 1 / -1;
    font-size: 0.7rem;
    color: var(--text-muted);
    line-height: 1.3;
    margin-left: 2px;
    margin-bottom: 4px;
    display: block;
}

.vibrato-row label {
    color: var(--text-secondary);
    font-weight: 500;
}

.vibrato-row input[type=range] {
    margin: 0;
}

.vibrato-val {
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    font-size: 0.78rem;
    color: var(--text-primary);
    text-align: right;
    font-weight: 600;
}

.vibrato-wave-select {
    grid-column: 2 / span 2;
    background: var(--bg-elev);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 4px 28px 4px 12px;
    border-radius: 999px;
    font-family: inherit;
    font-size: 0.8rem;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'><path d='M1 1l4 4 4-4' stroke='%236B6B6B' stroke-width='1.5' fill='none' stroke-linecap='round'/></svg>");
    background-repeat: no-repeat;
    background-position: right 10px center;
}

/* Vibrato ON/OFF pill in summary */
.vibrato-enable-toggle {
    display: inline-flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.vibrato-enable-toggle input[type="checkbox"] {
    display: none;
}

.vibrato-enable-pill {
    display: inline-block;
    padding: 3px 12px;
    background: var(--bg-soft);
    border: 1px solid var(--glass-border);
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--text-muted);
    transition: all 0.15s;
    letter-spacing: 0.3px;
}

.vibrato-enable-toggle.on .vibrato-enable-pill,
.vibrato-enable-toggle:has(input:checked) .vibrato-enable-pill {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: #fff;
}

/* Filter formant 2-col grid */
.formant-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 14px;
    row-gap: 12px;
}

.formant-grid .formant-control {
    margin-bottom: 0;
    padding: 12px 14px;
    background: var(--bg-elev);
    border: 1px solid var(--glass-border);
    border-left: 3px solid var(--glass-border);
    border-radius: 6px;
}

/* Per-formant left border color */
.formant-grid > .formant-control:nth-of-type(1) { border-left-color: var(--vivid-red); }
.formant-grid > .formant-control:nth-of-type(2) { border-left-color: var(--vivid-blue); }
.formant-grid > .formant-control:nth-of-type(3) { border-left-color: var(--vivid-purple); }
.formant-grid > .formant-control:nth-of-type(4) { border-left-color: var(--vivid-orange); }
.formant-grid > .formant-control:nth-of-type(5) { border-left-color: var(--vivid-green); }

/* Mobile-mirroring clean look: hide verbose hints inside formant cards */
.formant-grid .formant-control .hint,
.formant-grid .formant-control .q-hint {
    display: none;
}

/* Tighten slider + Q-row spacing inside formant cards */
.formant-grid .formant-control input[type="range"] {
    margin: 6px 0 0;
}
.formant-grid .formant-control .q-row {
    margin-top: 6px;
}

/* Formant header (label + ON/OFF toggle) */
.formant-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
}

.toggle-btn {
    background: var(--bg-elev);
    border: 1px solid var(--glass-border);
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 2px 10px;
    border-radius: 999px;
    cursor: pointer;
    transition: all 0.15s;
    letter-spacing: 0;
}

.toggle-btn:hover {
    border-color: var(--text-secondary);
    color: var(--text-primary);
}

.toggle-btn.active {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: #fff;
}

/* Voice type select */
.voice-type-select {
    background: var(--bg-elev);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 4px 28px 4px 12px;
    border-radius: 999px;
    font-family: inherit;
    font-size: 0.8rem;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'><path d='M1 1l4 4 4-4' stroke='%236B6B6B' stroke-width='1.5' fill='none' stroke-linecap='round'/></svg>");
    background-repeat: no-repeat;
    background-position: right 10px center;
}

.panel-header-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px 12px;
    margin-bottom: 14px;
}

.panel-header-row label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Toggle-checkbox (Auto-Routing legacy + similar) */
.toggle-checkbox {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    color: var(--text-secondary);
}

.toggle-checkbox input[type="checkbox"] {
    cursor: pointer;
    accent-color: var(--accent-color);
}

/* Responsive */
@media (max-width: 768px) {
    .dashboard {
        grid-template-columns: 1fr;
        grid-template-areas:
            "visualizer"
            "source"
            "filter";
    }

    .canvas-header-top,
    .canvas-header-bottom {
        flex-direction: column;
        align-items: stretch;
    }

    .canvas-primary-actions {
        justify-content: flex-end;
    }

    .canvas-control-group input[type="range"] {
        width: 60px;
    }

    .control-divider {
        display: none;
    }

    header h1 {
        font-size: 1.4rem;
    }

    .visualizer-panel {
        position: static;
    }

    .formant-grid {
        grid-template-columns: 1fr;
    }
}

/* Book Reference Footer */
.book-ref {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    text-align: center;
    padding: 6px 20px;
    font-size: 0.7rem;
    color: var(--text-muted);
    background: var(--bg-elev);
    border-top: 1px solid var(--glass-border);
    z-index: 10;
}

.book-ref a {
    color: var(--text-secondary);
    text-decoration: underline;
    text-decoration-color: var(--glass-border-strong);
    transition: color 0.2s;
}

.book-ref a:hover {
    color: var(--text-primary);
}

/* Mic Formant Method Select (Inconspicuous) */
.mic-method-select {
    appearance: none;
    -webkit-appearance: none;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 10px;
    padding: 0 4px;
    margin-left: -4px;
    cursor: pointer;
    outline: none;
}

.mic-method-select option {
    background: #fff;
    color: var(--text-primary);
}
/* =================================================================
   Learn Drawer (PC) — right-side slide-in lesson panel
   Coexists with the existing inline #roughness-legend (brief ref)
   ================================================================= */

/* Learn button — pill matching Mic / Play family */
.btn-learn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
}
.btn-learn svg {
    flex-shrink: 0;
    opacity: 0.9;
}

/* Canvas primary actions — unify Learn / Mic / Play to the same
   pill geometry, like .preset-btn / status YELL family. */
.canvas-primary-actions {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.canvas-primary-actions .btn {
    height: 32px;
    padding: 0 14px;
    border-radius: 999px;
    font-size: 0.85rem;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.canvas-primary-actions .btn.primary {
    padding: 0 18px;
    font-weight: 700;
    font-size: 0.85rem;
}

.learn-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(28, 24, 16, 0.32);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.22s ease;
    z-index: 800;
}
.learn-backdrop.open {
    opacity: 1;
    pointer-events: auto;
}

.learn-drawer {
    position: fixed;
    top: 0;
    right: 0;
    height: 100vh;
    width: 48vw;
    min-width: 480px;
    max-width: 720px;
    background: var(--bg-elev, #FCFAF3);
    border-left: 1px solid var(--glass-border);
    box-shadow: -12px 0 36px rgba(28, 24, 16, 0.18);
    transform: translateX(100%);
    transition: transform 0.28s cubic-bezier(0.2, 0.7, 0.2, 1);
    z-index: 900;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.learn-drawer.open { transform: translateX(0); }

.learn-drawer-header {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    border-bottom: 1px solid var(--glass-border);
    background: var(--bg-color);
}
.learn-drawer-title {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
}
.learn-drawer-close {
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    border-radius: 8px;
    padding: 6px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
}
.learn-drawer-close:hover {
    background: var(--accent-soft);
    color: var(--accent-color);
    border-color: var(--accent-color);
}

.learn-drawer-body {
    flex: 1;
    overflow-y: auto;
    padding: 16px 22px 32px;
    -webkit-overflow-scrolling: touch;
}

/* Lesson accordion */
.lesson {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    margin-bottom: 14px;
    overflow: hidden;
}
.lesson-summary {
    list-style: none;
    cursor: pointer;
    padding: 14px 18px;
    display: flex;
    align-items: center;
    gap: 12px;
    user-select: none;
}
.lesson-summary::-webkit-details-marker { display: none; }
.lesson-chapter {
    flex-shrink: 0;
    font-size: 0.74rem;
    font-weight: 700;
    padding: 3px 10px;
    background: var(--accent-soft);
    color: var(--accent-color);
    border-radius: 999px;
    letter-spacing: 0.04em;
}
.lesson-title {
    flex: 1;
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
}
.lesson-chevron {
    color: var(--text-muted);
    font-size: 1.1rem;
    transition: transform 0.18s;
}
.lesson[open] .lesson-chevron { transform: rotate(180deg); }
.lesson-body {
    padding: 4px 18px 20px;
    border-top: 1px solid var(--glass-border);
}

/* Story sections */
.story-sec {
    padding: 14px 0 4px;
    border-top: 1px dashed var(--glass-border);
}
.story-sec:first-child { padding-top: 8px; border-top: none; }
.sec-tag {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 2px 9px;
    background: rgba(0, 0, 0, 0.06);
    color: var(--text-secondary);
    border-radius: 4px;
    letter-spacing: 0.04em;
    margin-bottom: 6px;
}
.sec-tag.tag-rough { background: rgba(217, 125, 31, 0.15); color: #b35e0f; }
.sec-tag.tag-res   { background: rgba(46, 156, 100, 0.15); color: #1f7549; }
.sec-tag.tag-interact { background: rgba(46, 163, 155, 0.15); color: #1d7972; }
.sec-title {
    margin: 4px 0 8px;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.45;
}
.sec-body {
    margin: 0 0 10px;
    font-size: 0.92rem;
    line-height: 1.75;
    color: var(--text-primary);
}
.sec-body strong { font-weight: 700; }

/* Inline tag chips */
.tag {
    display: inline-block;
    padding: 1px 7px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
}
.tag-rough { background: rgba(217, 125, 31, 0.15); color: #b35e0f; }
.tag-res   { background: rgba(46, 156, 100, 0.15); color: #1f7549; }

/* Callouts */
.sec-callout {
    margin: 10px 0;
    padding: 10px 14px;
    background: var(--accent-soft);
    border-left: 3px solid var(--accent-color);
    border-radius: 6px;
    font-size: 0.88rem;
    line-height: 1.65;
    color: var(--text-primary);
}
.callout-label {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 1px 7px;
    margin-right: 6px;
    background: var(--accent-color);
    color: #fff;
    border-radius: 4px;
}
.sec-callout-warn { background: rgba(217, 125, 31, 0.1); border-left-color: #d97d1f; }
.sec-callout-warn .callout-label { background: #d97d1f; }
.sec-callout-key { background: rgba(46, 163, 155, 0.12); }

/* Formula box */
.formula-box {
    margin: 8px 0 10px;
    padding: 10px 14px;
    background: rgba(0, 0, 0, 0.04);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    text-align: center;
}
.formula-label {
    display: block;
    font-size: 0.74rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}
.formula-box code {
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    font-size: 0.98rem;
    font-weight: 600;
    color: var(--text-primary);
}
.formula-condition { background: rgba(217, 125, 31, 0.08); border-color: rgba(217, 125, 31, 0.3); }

/* Lists */
.bullet, .ordered { margin: 6px 0 12px; padding-left: 24px; }
.bullet li, .ordered li { margin-bottom: 6px; font-size: 0.9rem; line-height: 1.7; color: var(--text-primary); }

/* SVG figures */
.viz-figure {
    margin: 12px 0;
    padding: 10px 12px;
    background: rgba(255, 255, 255, 0.5);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
}
.viz-svg { width: 100%; height: auto; display: block; }
.viz-figure figcaption {
    margin-top: 6px;
    font-size: 0.78rem;
    line-height: 1.55;
    color: var(--text-secondary);
    text-align: center;
}

/* Interval grid */
.interval-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 6px;
    margin: 10px 0;
}
.ig-cell {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 6px 4px;
    background: rgba(0, 0, 0, 0.04);
    border-radius: 5px;
    font-size: 0.76rem;
    line-height: 1.35;
}
.ig-h { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-weight: 600; color: var(--text-primary); }
.ig-c { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; color: var(--text-secondary); margin-top: 2px; }
.ig-n { color: var(--text-muted); font-size: 0.68rem; margin-top: 2px; }
.ig-edge { background: rgba(217, 125, 31, 0.15); border: 1px solid rgba(217, 125, 31, 0.35); }

/* Compare table (full lesson version) */
.lesson-body .compare-table {
    width: 100%;
    margin: 8px 0 10px;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 0.86rem;
}
.lesson-body .compare-table th, .lesson-body .compare-table td {
    padding: 8px 10px;
    text-align: left;
    vertical-align: top;
    background: var(--bg-soft, rgba(0,0,0,0.02));
    border-bottom: 1px solid var(--glass-border);
}
.lesson-body .compare-table thead th { background: var(--bg-elev); font-weight: 700; }
.lesson-body .compare-table .th-rough { color: #b35e0f; background: rgba(217, 125, 31, 0.1); }
.lesson-body .compare-table .th-res { color: #1f7549; background: rgba(46, 156, 100, 0.1); }
.lesson-body .compare-table .cmp-row-label { font-weight: 700; color: var(--text-secondary); font-size: 0.8rem; width: 22%; }

/* Pitch mirror row (Lesson 1 §7) */
.story-sec-interact {
    background: rgba(46, 163, 155, 0.04);
    border-radius: 10px;
    padding: 14px 14px 8px;
    border-top: none;
}
.story-sec-interact + .story-sec { border-top: 1px dashed var(--glass-border); }
.learn-sync-note { font-size: 0.82rem; color: var(--text-secondary); margin-bottom: 10px; }
.learn-pitch-row { display: flex; align-items: baseline; gap: 10px; margin-bottom: 6px; flex-wrap: wrap; }
.learn-pitch-val {
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}
.learn-pitch-note { font-size: 0.82rem; color: var(--text-secondary); }
.learn-pitch-mirror { width: 100%; display: block; margin: 4px 0 6px; }
.status-hint { font-size: 0.8rem; color: var(--text-secondary); margin: 4px 0 12px; line-height: 1.5; }

/* Harmonic map (vertical list with ) bracket between rows) */
.hm-title { margin: 12px 0 4px; font-size: 0.9rem; font-weight: 700; color: var(--text-primary); }
.hm-sublegend { font-size: 0.78rem; color: var(--text-secondary); line-height: 1.55; margin-bottom: 8px; }
.hm-sublegend strong { color: var(--text-primary); font-weight: 600; }
.harmonic-map { display: flex; flex-direction: column; margin-bottom: 8px; }
.hm-row {
    display: grid;
    grid-template-columns: 56px 1fr auto;
    align-items: center;
    column-gap: 14px;
    padding: 9px 14px;
    border-radius: 6px;
    color: #fff;
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
.hm-row .hm-n { font-size: 1rem; font-weight: 700; }
.hm-row .hm-hz { font-size: 0.88rem; opacity: 0.95; }
.hm-row .hm-zone {
    font-size: 0.74rem;
    background: rgba(0, 0, 0, 0.22);
    padding: 2px 8px;
    border-radius: 3px;
    font-weight: 700;
}
.hm-pure { background: #2196f3; }
.hm-rough-res { background: #d97d1f; }
.hm-rough-unr { background: #d24545; }
.hm-ceiling { background: #888; }
.hm-interval {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 8px;
    padding: 0 16px 0 14px;
    height: 30px;
    margin: 1px 0;
}
.hm-bracket {
    display: inline-block;
    width: 9px;
    height: 26px;
    border: 1.5px solid var(--text-muted);
    border-left: none;
    border-radius: 0 7px 7px 0;
    flex-shrink: 0;
}
.hm-cent {
    font-size: 0.84rem;
    font-weight: 700;
    color: var(--text-primary);
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
.hm-degree {
    font-size: 0.76rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--bg-soft, rgba(0,0,0,0.04));
    padding: 2px 8px;
    border-radius: 4px;
    border: 1px solid var(--glass-border);
}
.hm-legend { display: flex; flex-wrap: wrap; gap: 12px; font-size: 0.78rem; color: var(--text-secondary); margin-bottom: 12px; }
.hm-legend span { display: inline-flex; align-items: center; gap: 4px; }
.hm-swatch { width: 11px; height: 11px; border-radius: 2px; display: inline-block; }
.hm-swatch.hm-pure { background: #2196f3; }
.hm-swatch.hm-rough-res { background: #d97d1f; }
.hm-swatch.hm-rough-unr { background: #d24545; }
.hm-swatch.hm-ceiling { background: #888; }

/* Empty-note for rough-res when not applicable */
.learn-empty-note {
    margin-top: 8px;
    padding: 8px 10px;
    background: rgba(217, 125, 31, 0.1);
    border: 1px dashed rgba(217, 125, 31, 0.4);
    border-radius: 5px;
    font-size: 0.78rem;
    color: #8b5a1f;
    line-height: 1.55;
}

/* Rd gradient bar */
.rd-gradient-bar {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    margin: 10px 0;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--glass-border);
}
.rdg-segment {
    padding: 10px 4px;
    text-align: center;
    font-size: 0.78rem;
    font-weight: 700;
    line-height: 1.35;
    color: #fff;
}
.rdg-segment span { display: block; font-size: 0.68rem; font-weight: 500; margin-top: 2px; opacity: 0.95; }
.rdg-pressed { background: #b71c1c; }
.rdg-pressed-mild { background: #d24545; }
.rdg-modal { background: #2EA39B; }
.rdg-breathy-mild { background: #d97d1f; }
.rdg-breathy { background: #b35e0f; }

/* Story-sec summary card */
.story-sec-summary {
    background: rgba(0, 0, 0, 0.03);
    border-radius: 10px;
    padding: 14px;
    margin: 14px 0 8px;
    border-top: none;
}
.story-sec-summary + .story-sec, .story-sec-summary + .references { border-top: none; }

/* References */
.references {
    margin-top: 14px;
    padding-top: 10px;
    border-top: 1px dashed var(--glass-border);
}
.references-summary {
    cursor: pointer;
    font-size: 0.84rem;
    font-weight: 600;
    color: var(--text-secondary);
    padding: 6px 0;
    user-select: none;
    list-style: none;
}
.references-summary::-webkit-details-marker { display: none; }
.references-summary::before { content: "▸ "; }
.references[open] .references-summary::before { content: "▾ "; }
.ref-list { margin: 6px 0 4px; padding-left: 20px; }
.ref-list li { font-size: 0.78rem; color: var(--text-secondary); line-height: 1.6; margin-bottom: 4px; }

/* When drawer is open: prevent body scroll behind */
body.learn-drawer-open { overflow: hidden; }

/* ============================================================
   Recordings panel — local-only voice recordings (IndexedDB)
   ============================================================ */
.recordings-panel {
    margin-top: 12px;
    padding: 10px 12px;
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.02);
}
.recordings-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 6px;
}
.recordings-title {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    letter-spacing: 0.04em;
    text-transform: uppercase;
}
.recordings-meta {
    font-size: 0.74rem;
    color: var(--text-secondary);
    opacity: 0.7;
}
.recordings-list {
    list-style: none;
    margin: 0;
    padding: 0;
    max-height: 220px;
    overflow-y: auto;
}
.recordings-list:empty + .recordings-empty {
    display: block;
}
.recordings-empty {
    display: none;
    font-size: 0.78rem;
    color: var(--text-secondary);
    opacity: 0.7;
    padding: 8px 4px;
    text-align: center;
}
.recordings-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 4px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    font-size: 0.8rem;
}
.recordings-item:last-child { border-bottom: none; }
.recordings-item.is-playing {
    background: rgba(79, 150, 80, 0.12);
    border-radius: 4px;
}
.rec-time {
    flex: 1 1 auto;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}
.rec-dur {
    flex: 0 0 auto;
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
    opacity: 0.7;
    min-width: 42px;
    text-align: right;
}
.rec-btn {
    flex: 0 0 auto;
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    border-radius: 4px;
    padding: 3px 8px;
    font-size: 0.74rem;
    cursor: pointer;
    transition: background 0.12s, color 0.12s;
}
.rec-btn:hover { background: rgba(255, 255, 255, 0.06); color: var(--text-primary); }
.rec-btn.danger:hover { background: rgba(220, 60, 60, 0.18); color: #ff7676; border-color: rgba(220, 60, 60, 0.4); }

/* Record button (Rec) — red dot accent when recording */
#mic-record.is-recording {
    color: #ff5252;
    border-color: rgba(255, 82, 82, 0.5);
    animation: rec-pulse 1.2s ease-in-out infinite;
}
@keyframes rec-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.55; }
}
#mic-record-timer {
    font-variant-numeric: tabular-nums;
    opacity: 0.85;
}