:root { --vspace-scale: 0.6; }
:root { --pad-scale: 0.7; }
:root { --font-scale: 0.95; }
:root { --control-min-col: 240px; }
:root { --separator-thickness: 1px; }
:root { --separator-color: rgba(0, 0, 0, 0.15); }
:root { --separator-vspace: 6px; }
/* @tweakable intro paragraph maximum width */
/* @tweakable the maximum width (in px or CSS units) the intro paragraph can occupy before wrapping */
:root { --intro-max-width: 1200px; }
/* @tweakable intro paragraph max lines on wide screens */
/* @tweakable set to a larger number to avoid cutting off the intro paragraph (set to 0 or a large number for no clamp) */
:root { --intro-line-clamp: 10; }
/* @tweakable title font size in rem so it fits on one line */
:root { --title-font-rem: 1.6rem; }
/* @tweakable title line height for single-line compactness */
:root { --title-line-height: 1.1; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    margin: 0;
    padding: 8px;
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    padding: calc(8px * var(--pad-scale)) !important;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

h1 {
    text-align: center;
    color: #2d3748;
    font-size: calc(var(--title-font-rem) * var(--font-scale)) !important;
    font-weight: 700;
    margin-bottom: calc(10px * var(--vspace-scale)) !important;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    /* ensure single line */
    white-space: nowrap;
    line-height: var(--title-line-height) !important;
}

.creator-credit {
    text-align: center;
    margin-top: -5px;
    margin-bottom: 15px;
    font-size: 1rem;
    color: #4a5568;
}

.creator-credit a {
    color: inherit;
    text-decoration: none;
    transition: color 0.3s ease;
}

.creator-credit a:hover {
    color: #667eea;
}

.container > p:not(.creator-credit) {
    text-align: center;
    color: #4a5568;
    font-size: calc(1.1rem * var(--font-scale)) !important;
    /* widen paragraph to use more page width */
    max-width: min(100%, var(--intro-max-width));
    margin-left: auto;
    margin-right: auto;
    margin-bottom: calc(12px * var(--vspace-scale)) !important;
}
/* desktop-only clamp to ensure no more than 2 lines on wide screens */
/* @tweakable enable two-line clamp for intro paragraph on desktop */
@media (min-width: 900px) {
  .container > p:not(.creator-credit) {
    display: -webkit-box;
    -webkit-line-clamp: var(--intro-line-clamp);
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
}

.controls {
    /* @tweakable controls block padding */
    padding: calc(6px * var(--pad-scale)) !important;
    /* @tweakable controls block vertical margin */
    margin: calc(6px * var(--vspace-scale)) 0 !important;
    /* @tweakable grid gap for controls */
    gap: calc(4px * var(--vspace-scale)) !important;
    background: rgba(255, 255, 255, 0.7);
    border-radius: 15px;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(var(--control-min-col), 1fr));
    align-items: start;
    justify-items: stretch;
}

.control-group {
    /* @tweakable control group margin bottom */
    margin-bottom: calc(4px * var(--vspace-scale)) !important;
    /* @tweakable control group padding */
    padding: calc(6px * var(--pad-scale)) !important;
    /* @tweakable control group internal gap */
    gap: calc(4px * var(--vspace-scale)) !important;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.control-group label {
    /* @tweakable label bottom spacing */
    margin-bottom: calc(2px * var(--vspace-scale)) !important;
    font-size: calc(1rem * var(--font-scale)) !important;
    display: block;
    font-weight: 600;
    color: #2d3748;
}

.control-group input[type="range"] {
    width: 220px;
    height: 6px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 4px;
    outline: none;
    margin-right: 15px;
    vertical-align: middle;
    -webkit-appearance: none;
    appearance: none;
}

.control-group input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 16px;
    height: 16px;
    background: #fff;
    border-radius: 50%;
    border: 3px solid #667eea;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
    transition: all 0.2s ease;
}

.control-group input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.control-group input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: #fff;
    border-radius: 50%;
    border: 3px solid #667eea;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.control-group select {
    width: 220px;
    padding: 12px 16px;
    border: 2px solid rgba(102, 126, 234, 0.3);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.9);
    font-size: 1rem;
    color: #2d3748;
    outline: none;
    transition: border-color 0.3s ease;
}

.control-group select:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    outline: none;
}

.control-group span {
    display: inline-block;
    min-width: 50px;
    text-align: center;
    font-weight: 600;
    color: #2d3748;
    vertical-align: middle;
    background: rgba(102, 126, 234, 0.1);
    padding: calc(6px * var(--pad-scale)) calc(12px * var(--pad-scale)) !important;
    border-radius: 6px;
    font-size: calc(0.9rem * var(--font-scale)) !important;
}

.control-group .description {
    display: none;
    font-size: calc(0.9rem * var(--font-scale)) !important;
    color: #718096;
    margin-top: 8px;
    font-style: italic;
    padding: calc(8px * var(--pad-scale)) calc(12px * var(--pad-scale)) !important;
    background: rgba(113, 128, 150, 0.1);
    border-radius: 6px;
    border-left: 3px solid #667eea;
}

.help-dropdown-container {
    /* @tweakable space above help panel */
    margin-top: calc(2px * var(--vspace-scale)) !important;
    /* @tweakable help panel padding */
    padding: calc(4px * var(--pad-scale)) !important;
    /* @tweakable space below help panel */
    margin-bottom: calc(2px * var(--vspace-scale)) !important;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.15), rgba(118, 75, 162, 0.15));
    border-radius: 15px;
    border: 2px solid rgba(102, 126, 234, 0.3);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.1);
    grid-column: 1 / -1;
}

.help-dropdown-container .control-group {
    /* @tweakable inner help group padding */
    padding: calc(8px * var(--pad-scale)) !important;
    margin-bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 12px;
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.help-dropdown-container .control-group label {
    font-size: calc(1.2rem * var(--font-scale)) !important;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 12px;
}

.help-dropdown-container .control-group select {
    width: 100%;
    padding: 14px 18px;
    font-size: calc(1.0rem * var(--font-scale)) !important;
    font-weight: 500;
    border: 2px solid rgba(102, 126, 234, 0.4);
    background: linear-gradient(135deg, #ffffff, #f8f9ff);
    color: #2d3748;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.1);
}

.help-dropdown-container .control-group select:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.15);
    outline: none;
}

.help-description-display {
    /* @tweakable help description padding */
    padding: calc(6px * var(--pad-scale)) calc(8px * var(--pad-scale)) !important;
    /* @tweakable help description margin top */
    margin-top: calc(4px * var(--vspace-scale)) !important;
    /* @tweakable help description min-height */
    min-height: 24px !important;
    padding: calc(15px * var(--pad-scale)) calc(20px * var(--pad-scale)) !important;
    background: rgba(102, 126, 234, 0.05);
    border-radius: 10px;
    border-left: 4px solid #667eea;
    font-style: italic;
    color: #4a5568;
    margin-top: calc(15px * var(--vspace-scale)) !important;
    font-size: calc(0.95rem * var(--font-scale)) !important;
    line-height: 1.4 !important;
}

.help-description-display.active {
    background: rgba(102, 126, 234, 0.1);
    border-left-color: #764ba2;
    color: #2d3748;
}

.top-control-panel {
    /* @tweakable panel vertical margin (above/below) */
    margin: calc(6px * var(--vspace-scale)) 0 !important;
    /* @tweakable gap inside control panel */
    gap: calc(6px * var(--vspace-scale)) !important;
    display: grid;
    grid-template-columns: 1fr;
    gap: 15px;
}

/* @tweakable compact control row layout settings */
.top-control-row {
    /* @tweakable menubar element gap */
    gap: 1px;
    /* @tweakable menubar min-height */
    min-height: 28px !important;
    /* @tweakable menubar padding (y x) */
    padding: calc(2px * var(--pad-scale)) calc(4px * var(--pad-scale)) !important;
    /* @tweakable menubar bottom margin */
    margin-bottom: calc(4px * var(--vspace-scale)) !important;
    display: flex;
    /* @tweakable allow wrapping in menubar (set to nowrap to keep single line) */
    flex-wrap: nowrap;
    align-items: center;
    justify-content: flex-start;
    /* @tweakable menubar bottom margin to reduce space above presets */
    margin-bottom: 6px;
    /* @tweakable menubar padding (y x) */
    padding: 2px 4px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 12px;
    border: 2px solid rgba(102, 126, 234, 0.3);
    box-shadow: 0 6px 15px rgba(102, 126, 234, 0.1);
    /* @tweakable menubar horizontal overflow handling */
    overflow-x: hidden;
}

/* Hide verbose labels inside the menubar to save space */
/* @tweakable show labels inside menubar (toggle display) */
.top-control-row .control-group label {
    display: none;
}

/* Tighten control group spacing inside menubar */
/* @tweakable menubar control group padding */
.top-control-row .control-group {
    margin-bottom: 0;
    padding: calc(2px * var(--pad-scale)) calc(4px * var(--pad-scale)) !important;
}

/* Volume in menubar */
/* @tweakable menubar volume slider width */
.top-control-row .volume-controls .control-group input[type="range"] {
    width: 110px;
    height: 6px;
}

/* Preset select sizing in menubar */
/* @tweakable menubar preset select width */
.top-control-row .preset-controls .control-group select {
    padding: 6px 8px;
    font-size: calc(0.85rem * var(--font-scale)) !important;
    width: 160px;
    min-width: 140px;
}

/* Playback buttons compact */
/* @tweakable menubar button min-width */
.top-control-row .playback-controls button {
    min-width: 68px;
    /* @tweakable menubar button padding (y x) */
    padding: 6px 8px;
    /* @tweakable menubar button font size */
    font-size: calc(0.85rem * var(--font-scale)) !important;
    margin: 0;
}

/* Export controls compact */
/* @tweakable menubar export format select width */
.top-control-row .export-controls .control-group select#exportFormat {
    width: 72px;
    padding: 6px 8px;
    font-size: calc(0.85rem * var(--font-scale)) !important;
}
/* @tweakable menubar export duration input width */
.top-control-row .export-controls .control-group input#exportDuration {
    width: 70px;
    padding: 6px 8px;
    font-size: calc(0.85rem * var(--font-scale)) !important;
}
/* @tweakable menubar export button min-width */
.top-control-row .export-controls .control-group button#downloadButton {
    min-width: 86px;
    padding: 6px 8px;
    font-size: calc(0.85rem * var(--font-scale)) !important;
}

/* Menubar export row spacing */
/* @tweakable menubar export controls gap */
.top-control-row .export-controls .export-row {
    gap: 6px;
    align-items: center;
}

/* Reduce global button size only within menubar context, not elsewhere */
.top-control-row button {
    /* inherits tweakables above; ensure consistent height */
    line-height: 1.1;
}

/* Ensure the four groups compress nicely */
/* @tweakable menubar flex-basis for groups (allows tighter packing) */
.top-control-row .volume-controls,
.top-control-row .preset-controls,
.top-control-row .playback-controls,
.top-control-row .export-controls {
    flex: 0 0 auto;
}

/* Reduce top visualization container margin since menubar is denser */
/* @tweakable spacing below menubar */
.top-control-panel .visualization-container {
    /* @tweakable spacing below menubar */
    margin: 2px 0 0 0;
    /* @tweakable visualization container padding (compact) */
    padding: calc(6px * var(--pad-scale)) !important;
}

/* @tweakable separated preset panel width */
.top-control-panel .preset-controls .control-group select {
    width: 220px;
}

/* @tweakable separated preset panel inner padding */
.top-control-panel .preset-controls .control-group {
    padding: 12px;
}

/* Mobile: still keep single-line where possible but allow scroll if needed */
@media (max-width: 768px) {
    /* @tweakable mobile menubar horizontal scroll */
    .top-control-row {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    .top-control-row .preset-controls .control-group select {
        width: 140px;
    }
    .top-control-row .volume-controls .control-group input[type="range"] {
        width: 100px;
    }
}

@media (max-width: 768px) {
    /* @tweakable mobile layout for compact controls */
    .top-control-row {
        grid-template-columns: 1fr;
        gap: 8px;
    }
    
    .top-control-panel .volume-controls .control-group input[type="range"] {
        width: 100px;
    }
    
    .top-control-panel .playback-controls {
        flex-direction: column;
    }
    
    .top-control-panel .playback-controls button {
        min-width: auto;
        width: 100%;
    }
    
    .top-control-panel {
        margin: 15px 0 20px 0;
        gap: 12px;
    }
    
    .top-control-panel .visualization-container {
        padding: 15px;
        margin: 12px 0;
    }
    .container {
        padding: 15px;
        margin: 8px;
    }
    
    h1 {
        font-size: calc(2rem * var(--font-scale)) !important;
    }
    
    .nrt-concepts {
        grid-template-columns: 1fr;
    }
    
    .structure-parts {
        grid-template-columns: 1fr;
    }
    
    button {
        width: 100%;
        margin: 3px 0;
    }
}

/* @tweakable Start Audio button styling */
#startAudioButton {
    background: linear-gradient(135deg, #48bb78, #38a169);
    color: white;
    border: none;
    padding: calc(10px * var(--pad-scale)) calc(14px * var(--pad-scale)) !important;
    min-width: 130px !important;
    font-size: calc(1rem * var(--font-scale)) !important;
    border-radius: 12px;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 700;
    transition: all 0.3s ease;
    box-shadow: 0 6px 20px rgba(72, 187, 120, 0.4);
    min-width: 160px;
    position: relative;
}

#startAudioButton:hover:enabled {
    background: linear-gradient(135deg, #38a169, #2f855a);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(72, 187, 120, 0.5);
}

#startAudioButton:active:enabled {
    transform: translateY(-1px);
}

#startAudioButton:disabled {
    background: linear-gradient(135deg, #a0aec0, #718096);
    cursor: not-allowed;
    box-shadow: 0 2px 8px rgba(160, 174, 192, 0.3);
    transform: none;
}

/* @tweakable activation success styling */
#startAudioButton.activated {
    background: linear-gradient(135deg, #48bb78, #38a169);
    box-shadow: 0 0 20px rgba(72, 187, 120, 0.6);
}

/* @tweakable play button styling when audio is not activated */
#playButton:not(.audio-ready) {
    opacity: 0.6;
    pointer-events: none;
}

body .volume-controls:not(.top-control-panel .volume-controls),
body .preset-controls:not(.top-control-panel .preset-controls),
body .playback-controls:not(.top-control-panel .playback-controls),
body .visualization-container:not(.top-control-panel .visualization-container) {
    display: none;
}

.theory-section {
    /* @tweakable section vertical margin */
    margin: calc(10px * var(--vspace-scale)) 0 !important;
    /* @tweakable section padding */
    padding: calc(10px * var(--pad-scale)) !important;
    background: rgba(255, 255, 255, 0.7);
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.theory-section h2 {
    color: #2d3748;
    text-align: center;
    margin-bottom: 20px;
    font-size: 1.8rem;
}

.nrt-concepts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: calc(10px * var(--vspace-scale)) !important;
    margin-bottom: 20px;
}

.concept-card {
    background: rgba(255, 255, 255, 0.8);
    padding: calc(12px * var(--pad-scale)) !important;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    transition: all 0.3s ease;
}

.concept-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.concept-card h3 {
    color: #667eea;
    margin-bottom: calc(8px * var(--vspace-scale)) !important;
    font-size: calc(1.05rem * var(--font-scale)) !important;
}

.concept-card p {
    color: #4a5568;
    font-size: calc(0.92rem * var(--font-scale)) !important;
    margin: 0;
}

.composition-structure {
    /* @tweakable section vertical margin */
    margin: calc(10px * var(--vspace-scale)) 0 !important;
    /* @tweakable section padding */
    padding: calc(10px * var(--pad-scale)) !important;
    background: rgba(255, 255, 255, 0.7);
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.composition-structure h2 {
    color: #2d3748;
    text-align: center;
    margin-bottom: 20px;
    font-size: 1.8rem;
}

.structure-parts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: calc(10px * var(--vspace-scale)) !important;
}

.part {
    background: rgba(255, 255, 255, 0.8);
    padding: calc(12px * var(--pad-scale)) !important;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    text-align: center;
    transition: all 0.3s ease;
}

.part:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.part h3 {
    color: #764ba2;
    margin-bottom: calc(8px * var(--vspace-scale)) !important;
    font-size: calc(1.05rem * var(--font-scale)) !important;
}

.part p {
    color: #4a5568;
    font-size: calc(0.92rem * var(--font-scale)) !important;
    margin: 0;
}

.notes {
    /* @tweakable section vertical margin */
    margin: calc(10px * var(--vspace-scale)) 0 !important;
    /* @tweakable section padding */
    padding: calc(10px * var(--pad-scale)) !important;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    font-size: calc(0.95rem * var(--font-scale)) !important;
    color: #4a5568;
}

.notes ul {
    list-style-type: none;
    padding-left: 0;
}

.notes li {
    margin-bottom: 6px;
    padding-left: 20px;
    position: relative;
}

.notes li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
}

.notes strong {
    color: #2d3748;
}

.visualization-container {
    /* @tweakable visualization block margin */
    margin: calc(4px * var(--vspace-scale)) 0 !important;
    /* @tweakable visualization block padding */
    padding: calc(6px * var(--pad-scale)) !important;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    text-align: center;
}

.visualization-container h3 {
    /* @tweakable viz title spacing */
    margin-bottom: calc(8px * var(--vspace-scale)) !important;
    color: #2d3748;
    margin-bottom: 20px;
    font-size: calc(1.2rem * var(--font-scale)) !important;
}

#visualizationCanvas {
    border: 2px solid rgba(102, 126, 234, 0.3);
    border-radius: 10px;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.18) !important;
    max-width: 100%;
    height: auto;
}

.viz-controls {
    /* @tweakable spacing above viz controls */
    margin-top: 8px;
    /* @tweakable grid gap for viz controls */
    gap: 8px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    text-align: left;
}

.preset-controls {
    /* @tweakable preset panel padding */
    padding: 0;
    /* @tweakable preset panel vertical margin */
    margin: calc(2px * var(--vspace-scale)) 0 !important;
    /* @tweakable preset frame radius */
    border-radius: 6px;
    /* @tweakable preset panel border width */
    border: 1px solid rgba(102, 126, 234, 0.4);
}

.preset-controls .control-group {
    /* @tweakable preset inner padding */
    padding: calc(4px * var(--pad-scale)) !important;
    /* @tweakable preset inner group padding to reduce space inside frame */
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border-radius: 10px;
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.preset-controls .control-group label {
    /* @tweakable preset label spacing and size to tighten */
    /* @tweakable preset label font size */
    font-size: calc(1.0rem * var(--font-scale)) !important;
    font-weight: 700;
    color: #667eea;
    /* @tweakable preset label bottom margin */
    margin-bottom: calc(4px * var(--vspace-scale)) !important;
}

.preset-controls .control-group select {
    /* @tweakable preset select compact padding and font size */
    /* @tweakable preset select padding */
    padding: calc(6px * var(--pad-scale)) calc(8px * var(--pad-scale)) !important;
    /* @tweakable preset select font size */
    font-size: calc(0.95rem * var(--font-scale)) !important;
    font-weight: 600;
    border: 2px solid rgba(102, 126, 234, 0.4);
    background: linear-gradient(135deg, #ffffff, #f8f9ff);
    color: #2d3748;
    box-shadow: 0 3px 8px rgba(102, 126, 234, 0.08);
}

.preset-controls .control-group select:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.15);
    outline: none;
}

.preset-controls .control-group .description {
    padding: calc(10px * var(--pad-scale)) calc(15px * var(--pad-scale)) !important;
    background: rgba(102, 126, 234, 0.05);
    border-radius: 8px;
    border-left: 4px solid #667eea;
    font-style: italic;
    color: #4a5568;
    margin-top: calc(12px * var(--vspace-scale)) !important;
}

.volume-controls {
    /* @tweakable volume block padding */
    padding: calc(8px * var(--pad-scale)) !important;
    /* @tweakable volume block margin */
    margin: calc(8px * var(--vspace-scale)) 0 !important;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 15px;
    padding: 15px;
    margin: 20px 0;
    border: 2px solid rgba(102, 126, 234, 0.3);
    box-shadow: 0 6px 15px rgba(102, 126, 234, 0.1);
}

.volume-controls .control-group {
    /* @tweakable volume inner group padding */
    padding: calc(8px * var(--pad-scale)) !important;
    margin-bottom: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), rgba(118, 75, 162, 0.05));
    border-radius: 10px;
    border: 1px solid rgba(102, 126, 234, 0.1);
}

.volume-controls .control-group label {
    /* @tweakable volume label spacing */
    margin-bottom: 4px;
    font-size: calc(1.1rem * var(--font-scale)) !important;
    font-weight: 600;
    color: #667eea;
}

.volume-controls .control-group input[type="range"] {
    background: linear-gradient(135deg, #667eea, #764ba2);
}

.volume-controls .control-group span {
    background: rgba(102, 126, 234, 0.1);
    color: #2d3748;
    font-weight: 600;
}

button {
    /* @tweakable global button padding */
    padding: var(--btn-pad-y) var(--btn-pad-x) !important;
    /* @tweakable global minimum button width */
    min-width: var(--btn-min-w) !important;
    /* @tweakable global button font size */
    font-size: calc(0.9rem * var(--font-scale)) !important;
    /* @tweakable global button horizontal margin */
    margin: 0 4px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 15px 30px;
    margin: 0 10px;
    border-radius: 12px;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
    min-width: 160px;
}

button:hover:enabled {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

button:active:enabled {
    transform: translateY(0);
}

button:disabled {
    background: #a0aec0;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.status {
    /* @tweakable status vertical margin */
    margin: calc(8px * var(--vspace-scale)) 0 !important;
    /* @tweakable status padding */
    padding: calc(8px * var(--pad-scale)) !important;
    /* @tweakable status font size */
    font-size: calc(0.95rem * var(--font-scale)) !important;
    text-align: center;
    margin: 15px 0;
    font-weight: 600;
    padding: 12px;
    background: rgba(72, 187, 120, 0.1);
    color: #2f855a;
    border-radius: 10px;
    border: 1px solid rgba(72, 187, 120, 0.3);
}

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

/* Control Bar compact sizing */
.top-control-row .volume-controls,
.top-control-row .export-controls {
    flex: 1 1 auto;
}
.top-control-row .playback-controls {
    flex: 0 0 auto;
    display: flex;
    gap: 8px;
}

/* @tweakable minimum button width within the control bar */
.top-control-row .playback-controls button,
.top-control-row .export-controls .control-group button#downloadButton {
    /* @tweakable menubar button min-width */
    min-width: 72px;
    /* @tweakable menubar button padding */
    padding: calc(6px * var(--pad-scale)) calc(8px * var(--pad-scale)) !important;
    /* @tweakable menubar button font size */
    font-size: calc(0.85rem * var(--font-scale)) !important;
    min-width: 100px;
    padding: calc(10px * var(--pad-scale)) calc(14px * var(--pad-scale)) !important;
    font-size: calc(0.9rem * var(--font-scale)) !important;
}

/* @tweakable volume slider width within the control bar */
.top-control-row .volume-controls .control-group input[type="range"] {
    width: 140px;
}

/* @tweakable export inputs compact widths within the control bar */
.top-control-row .export-controls .control-group select#exportFormat { width: 90px; }
.top-control-row .export-controls .control-group input#exportDuration { width: 80px; }

/* @tweakable separated preset panel select width */
.top-control-panel .preset-controls .control-group select {
    width: 180px;
}

/* ===== End Compact Layout Overrides ===== */

/* ===== Row/Column Alignment & No-Wrap in Menubar ===== */
/* @tweakable menubar control group flex direction (row for inline alignment) */
.top-control-row .control-group {
  display: flex;
  flex-direction: row;
  align-items: center;
  /* @tweakable menubar control group gap */
  gap: 6px;
  /* @tweakable prevent line wrapping inside control groups */
  white-space: nowrap;
}

/* @tweakable compact value chip style inside menubar to prevent line breaks */
.top-control-row .control-group span {
  display: inline;
  padding: 0 !important;
  min-width: auto;
  background: transparent;
}

/* @tweakable compact slider spacing in menubar */
.top-control-row .control-group input[type="range"] {
  margin-right: 6px;
}

/* @tweakable compact select spacing in menubar */
.top-control-row .control-group select {
  margin-right: 6px;
}

/* ===== Controls Grid Alignment ===== */
/* @tweakable controls grid align items start for neat column layout */
.controls {
  align-items: start;
  justify-items: stretch;
}

/* Thin full-width section separator */
.section-separator {
    border: 0;
    border-top: var(--separator-thickness) solid var(--separator-color);
    margin: var(--separator-vspace) 0;
}

/* Visualization controls: single-line, compact layout */
/* @tweakable visualization controls inline gap */
:root { --viz-inline-gap: 8px; }
/* @tweakable visualization controls allow wrapping (false = single line) */
:root { --viz-inline-nowrap: nowrap; }

.viz-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--viz-inline-gap);
    flex-wrap: var(--viz-inline-nowrap);
    margin-top: 6px; /* compact */
}

/* Make each viz control-group inline */
.viz-controls .control-group {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 6px;
    margin: 0;
    padding: 0 !important;
    background: transparent;
    border: none;
}

/* Inline labels for viz controls */
/* @tweakable visualization label right margin */
.viz-controls .control-group label {
    margin: 0 6px 0 0 !important;
    font-size: calc(0.95rem * var(--font-scale)) !important;
    font-weight: 600;
    color: #2d3748;
}

/* Compact select in viz controls */
/* @tweakable visualization mode select max width */
:root { --viz-mode-select-maxw: 240px; }
.viz-controls .control-group select#vizTypeSelect {
    max-width: var(--viz-mode-select-maxw);
    width: auto;
    padding: 6px 8px;
    font-size: calc(0.9rem * var(--font-scale)) !important;
}

/* Compact slider in viz controls */
/* @tweakable visualization sensitivity slider width */
:root { --viz-sensitivity-slider-w: 160px; }
.viz-controls .control-group input#vizSensitivitySlider {
    width: var(--viz-sensitivity-slider-w);
    height: 6px;
    margin-right: 4px;
}

/* Compact value chip in viz controls */
.viz-controls .control-group span#vizSensitivityValue {
    padding: 2px 6px !important;
    min-width: 32px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 6px;
    font-size: calc(0.85rem * var(--font-scale)) !important;
}

/* Ensure viz controls don't break lines on mobile; allow horizontal scroll if needed */
@media (max-width: 768px) {
    /* @tweakable mobile viz controls horizontal scroll */
    .viz-controls {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        justify-content: flex-start;
    }
}