/* Sonic Lab — Dark theme synth UI */

@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Exo+2:wght@300;400;600;700&family=Fira+Code:wght@400;500&display=swap');

:root {
    --bg-primary: #1a1614;
    --bg-secondary: #211d19;
    --bg-panel: #2a2520;
    --bg-input: #1e1a16;
    --border: #3a352e;
    --border-light: #4a443c;
    --text-primary: #e0dcd4;
    --text-secondary: #9a9488;
    --text-dim: #5a5448;
    --accent: #d4a847;
    --accent-dim: #7a6228;
    --accent-hover: #e4b857;
    --accent-glow: rgba(212, 168, 71, 0.15);
    --danger: #cc4444;
    --success: #5a9a44;
    --warning: #d49a30;
    --orange: #c47830;
    --purple: #9966cc;
    --slider-track: #2e2820;
    --slider-thumb: #d4a847;

    /* Skeuomorphic extras */
    --bevel-light: #3a352f;
    --bevel-dark: #0f0d0b;
    --crt-green: #33cc55;
    --crt-bg: #0a1a0e;
    --knob-body: #3a3530;
    --knob-indicator: #d4a847;
}

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

html, body {
    height: 100%;
    overflow: hidden;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Exo 2', sans-serif;
    font-size: 14px;
}

/* ====== APP LAYOUT ====== */
.app-layout {
    display: grid;
    grid-template-columns: 250px 1fr 320px;
    grid-template-rows: 56px 1fr;
    height: 100vh;
    gap: 1px;
    background: var(--border);
}

/* ====== HEADER ====== */
.header {
    grid-column: 1 / -1;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    padding: 0 20px;
    gap: 20px;
    z-index: 10;
    border-bottom: 1px solid var(--border);
}

.header-logo {
    font-family: 'Orbitron', sans-serif;
    font-size: 20px;
    font-weight: 900;
    color: var(--accent);
    text-shadow: 0 0 15px rgba(212, 168, 71, 0.4);
    letter-spacing: 2px;
    white-space: nowrap;
}

.header-logo span {
    color: #cc6644;
    text-shadow: 0 0 15px rgba(204, 102, 68, 0.4);
}

.mode-tabs {
    display: flex;
    gap: 2px;
    background: var(--bg-primary);
    border-radius: 6px;
    padding: 2px;
}

.mode-tab {
    padding: 6px 16px;
    border: 1px solid var(--border);
    background: linear-gradient(180deg, #3a352e, #2a2520);
    color: var(--text-secondary);
    font-family: 'Exo 2', sans-serif;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s;
    letter-spacing: 1px;
    box-shadow: 0 2px 3px rgba(0,0,0,0.3), inset 0 1px 0 rgba(255,255,255,0.05);
}

.mode-tab:hover {
    color: var(--text-primary);
    border-color: var(--border-light);
}

.mode-tab:active {
    box-shadow: inset 0 2px 3px rgba(0,0,0,0.3);
    transform: translateY(1px);
}

.mode-tab.active {
    background: linear-gradient(180deg, #2a2520, #211d19);
    color: var(--accent);
    border-color: var(--accent-dim);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.4), 0 0 8px rgba(212,168,71,0.1);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-left: auto;
}

.undo-btn, .redo-btn {
    width: 32px;
    height: 32px;
    border: 1px solid var(--border);
    background: linear-gradient(180deg, #3a352e, #2a2520);
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: all 0.2s;
    box-shadow: 0 2px 3px rgba(0,0,0,0.3), inset 0 1px 0 rgba(255,255,255,0.05);
}

.undo-btn:hover:not(:disabled), .redo-btn:hover:not(:disabled) {
    border-color: var(--accent);
    color: var(--accent);
    background: linear-gradient(180deg, #3a352e, #2a2520);
    box-shadow: 0 2px 3px rgba(0,0,0,0.3), inset 0 1px 0 rgba(255,255,255,0.05), 0 0 6px rgba(212,168,71,0.15);
}

.undo-btn:active:not(:disabled), .redo-btn:active:not(:disabled) {
    box-shadow: inset 0 2px 3px rgba(0,0,0,0.3);
    transform: translateY(1px);
}

.undo-btn:disabled, .redo-btn:disabled {
    opacity: 0.25;
    cursor: default;
}

.master-volume {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 12px;
    letter-spacing: 1px;
}

.play-btn, .stop-btn {
    width: 40px;
    height: 40px;
    border: 2px solid var(--accent);
    background: linear-gradient(180deg, #3a352e, #252220);
    color: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: all 0.2s;
    box-shadow: 0 3px 6px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.06);
}

.play-btn:hover {
    background: linear-gradient(180deg, var(--accent), #a8842a);
    color: var(--bg-primary);
    box-shadow: 0 3px 8px rgba(0,0,0,0.4), 0 0 15px rgba(212,168,71,0.3);
}

.play-btn:active {
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.4);
    transform: translateY(1px);
}

.stop-btn {
    border-color: var(--danger);
    color: var(--danger);
}

.stop-btn:hover {
    background: linear-gradient(180deg, var(--danger), #993333);
    color: white;
    box-shadow: 0 3px 8px rgba(0,0,0,0.4), 0 0 15px rgba(204,68,68,0.3);
}

.stop-btn:active {
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.4);
    transform: translateY(1px);
}

/* ====== SIDEBAR ====== */
.sidebar {
    background: var(--bg-secondary);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.sidebar-section {
    border-bottom: 1px solid var(--border);
}

.sidebar-title {
    font-family: 'Orbitron', sans-serif;
    font-size: 11px;
    color: var(--text-secondary);
    letter-spacing: 2px;
    padding: 12px 16px 8px;
    text-transform: uppercase;
}

/* Layer list */
.layer-list {
    padding: 4px 8px;
}

.layer-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s;
    border: 1px solid transparent;
}

.layer-item:hover {
    background: rgba(212, 168, 71, 0.05);
}

.layer-item.selected {
    background: var(--accent-glow);
    border-color: var(--accent-dim);
}

.layer-item .layer-color {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

.layer-item .layer-name {
    flex: 1;
    font-size: 13px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.layer-item .layer-type {
    font-size: 10px;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.layer-item .layer-toggle {
    opacity: 0.4;
    cursor: pointer;
    font-size: 16px;
}

.layer-item .layer-toggle.enabled {
    opacity: 1;
    color: var(--success);
}

.layer-actions {
    display: flex;
    gap: 6px;
    padding: 8px;
}

.layer-actions button {
    flex: 1;
    padding: 6px;
    border: 1px solid var(--border);
    background: linear-gradient(180deg, #3a352e, #2a2520);
    color: var(--text-secondary);
    font-size: 12px;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s;
    font-family: 'Exo 2', sans-serif;
    box-shadow: 0 2px 3px rgba(0,0,0,0.25), inset 0 1px 0 rgba(255,255,255,0.04);
}

.layer-actions button:hover {
    border-color: var(--accent-dim);
    color: var(--accent);
}

.layer-actions button:active {
    box-shadow: inset 0 2px 3px rgba(0,0,0,0.3);
    transform: translateY(1px);
}

/* Preset list */
.preset-category {
    padding: 4px 8px;
}

.preset-category-title {
    font-size: 11px;
    color: var(--text-dim);
    letter-spacing: 1px;
    padding: 6px 10px 2px;
    text-transform: uppercase;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
}

.preset-category-title:hover {
    color: var(--text-secondary);
}

.preset-category-title::before {
    content: '\25B6';
    font-size: 8px;
    transition: transform 0.2s;
}

.preset-category-title.open::before {
    transform: rotate(90deg);
}

.preset-items {
    display: none;
}

.preset-items.open {
    display: block;
}

.preset-item {
    padding: 5px 10px 5px 24px;
    font-size: 13px;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.15s;
    color: var(--text-secondary);
}

.preset-item:hover {
    color: var(--accent);
    background: var(--accent-glow);
}

.preset-save-btn {
    display: block;
    width: calc(100% - 16px);
    margin: 8px;
    padding: 8px;
    border: 1px solid var(--border);
    background: linear-gradient(180deg, #3a352e, #2a2520);
    color: var(--text-secondary);
    font-family: 'Exo 2', sans-serif;
    font-size: 12px;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s;
    box-shadow: 0 2px 3px rgba(0,0,0,0.25), inset 0 1px 0 rgba(255,255,255,0.04);
}

.preset-save-btn:hover {
    border-color: var(--success);
    color: var(--success);
}

.preset-save-btn:active {
    box-shadow: inset 0 2px 3px rgba(0,0,0,0.3);
    transform: translateY(1px);
}

/* ====== MAIN PANEL ====== */
.main-panel {
    background: var(--bg-primary);
    overflow-y: auto;
    padding: 20px;
}

.panel-content {
    display: none;
}

.panel-content.active {
    display: block;
}

/* Control sections */
.control-section {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 16px;
    box-shadow:
        inset 1px 1px 0 var(--bevel-light),
        inset -1px -1px 0 var(--bevel-dark),
        0 2px 4px rgba(0,0,0,0.3);
}

.control-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.control-section-title {
    font-family: 'Orbitron', sans-serif;
    font-size: 12px;
    color: var(--accent);
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-right: auto;
    text-shadow: 0 1px 0 rgba(0,0,0,0.4);
}

.section-toggle {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: linear-gradient(180deg, #3a352e, #252220);
    border: 1px solid var(--border);
    cursor: pointer;
    position: relative;
    transition: all 0.2s;
    box-shadow: 0 2px 4px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.05);
    display: flex;
    align-items: center;
    justify-content: center;
}

.section-toggle:active {
    box-shadow: inset 0 2px 3px rgba(0,0,0,0.4);
    transform: translateY(1px);
}

.section-toggle::after {
    content: '';
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #3a352e;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.4);
    transition: all 0.2s;
}

.section-toggle.active {
    border-color: var(--border-light);
}

.section-toggle.active::after {
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.2), 0 0 6px currentColor;
}

/* LED colours per effect */
[data-effect="filter"] .section-toggle.active::after {
    background: #ab47bc;
}
[data-effect="lfo"] .section-toggle.active::after {
    background: #77bb44;
}
[data-effect="gain"] .section-toggle.active::after {
    background: #d4a847;
}
[data-effect="distortion"] .section-toggle.active::after {
    background: #ff7043;
}
[data-effect="delay"] .section-toggle.active::after {
    background: #66bb6a;
}
[data-effect="reverb"] .section-toggle.active::after {
    background: #26c6da;
}
[data-effect="bitcrusher"] .section-toggle.active::after {
    background: #ec407a;
}

/* Knob rows */
.knob-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 20px;
    justify-content: center;
    padding: 8px 0;
}

synth-knob {
    width: 64px;
    height: 64px;
}

.knob-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 80px;
    gap: 4px;
}

.knob-group .control-label {
    width: auto;
    font-size: 10px;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    flex-shrink: unset;
}

.knob-group .control-value {
    width: auto;
    min-width: auto;
    font-size: 10px;
    text-align: center;
    flex-shrink: unset;
}

/* Per-effect knob indicator colours */
[data-effect="filter"] synth-knob       { --knob-indicator: #ab47bc; }
[data-effect="distortion"] synth-knob   { --knob-indicator: #ff7043; }
[data-effect="delay"] synth-knob        { --knob-indicator: #66bb6a; }
[data-effect="reverb"] synth-knob       { --knob-indicator: #26c6da; }
[data-effect="bitcrusher"] synth-knob   { --knob-indicator: #ec407a; }
[data-effect="gain"] synth-knob         { --knob-indicator: #d4a847; }

/* Control rows */
.control-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}

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

.control-label {
    width: 80px;
    font-size: 12px;
    color: var(--text-secondary);
    letter-spacing: 1px;
    flex-shrink: 0;
}

.control-value {
    width: 70px;
    font-family: 'Fira Code', monospace;
    font-size: 12px;
    color: var(--accent);
    text-align: right;
    flex-shrink: 0;
}

/* Range sliders */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    flex: 1;
    height: 6px;
    background: var(--slider-track);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--slider-thumb);
    border: 2px solid var(--bg-primary);
    cursor: pointer;
    box-shadow: 0 0 8px rgba(212, 168, 71, 0.3);
}

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

input[type="range"]:hover::-webkit-slider-thumb {
    box-shadow: 0 0 15px rgba(212, 168, 71, 0.5);
}

/* Select dropdowns */
select {
    background: var(--bg-input);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-bottom: 2px solid var(--bevel-dark);
    padding: 6px 10px;
    border-radius: 4px;
    font-family: 'Exo 2', sans-serif;
    font-size: 13px;
    cursor: pointer;
    outline: none;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.15);
}

select:focus {
    border-color: var(--accent);
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.15), 0 0 4px rgba(212,168,71,0.15);
}

/* ADSR Canvas */
.adsr-canvas-wrap {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 4px;
    margin-bottom: 12px;
}

.adsr-canvas {
    display: block;
    width: 100%;
    height: 80px;
}

/* ====== RIGHT PANEL ====== */
.right-panel {
    background: var(--bg-secondary);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1px;
}

/* Visualizers */
.visualizer-section {
    padding: 12px;
    background: var(--bg-secondary);
}

.visualizer-title {
    font-family: 'Orbitron', sans-serif;
    font-size: 10px;
    color: var(--text-dim);
    letter-spacing: 2px;
    margin-bottom: 6px;
    text-transform: uppercase;
}

.visualizer-canvas {
    display: block;
    width: 100%;
    height: 100px;
    background: var(--crt-bg);
    border: none;
    border-radius: 4px;
}

/* CRT Screen Effect */
.crt-screen {
    position: relative;
    border-radius: 10px;
    overflow: hidden;
    border: 3px solid #2a2520;
    box-shadow:
        inset 0 0 30px rgba(0,0,0,0.5),
        0 2px 8px rgba(0,0,0,0.4),
        inset 0 0 60px rgba(10,26,14,0.3);
    background: var(--crt-bg);
}

.crt-screen::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0, 0, 0, 0.06) 2px,
        rgba(0, 0, 0, 0.06) 4px
    );
    pointer-events: none;
    z-index: 1;
}

.crt-screen::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(
        ellipse at center,
        transparent 55%,
        rgba(0, 0, 0, 0.35) 100%
    );
    pointer-events: none;
    z-index: 2;
}

/* XY Pad */
.xy-pad-section {
    padding: 12px;
    background: var(--bg-secondary);
}

.xy-pad-axes {
    display: flex;
    gap: 8px;
    margin-bottom: 8px;
}

.xy-axis-selector {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 6px;
}

.xy-axis-selector label {
    font-family: 'Orbitron', sans-serif;
    font-size: 10px;
    color: var(--accent);
    letter-spacing: 1px;
    flex-shrink: 0;
    width: 14px;
}

.xy-axis-selector select {
    flex: 1;
    font-size: 11px;
    padding: 3px 6px;
}

.xy-pad-canvas {
    display: block;
    width: 100%;
    height: 180px;
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: crosshair;
    touch-action: none;
}

/* Export panel */
.export-section {
    padding: 12px;
    background: var(--bg-secondary);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.export-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
    margin-bottom: 10px;
}

.export-btn {
    padding: 8px;
    border: 1px solid var(--border);
    background: linear-gradient(180deg, #3a352e, #2a2520);
    color: var(--text-secondary);
    font-family: 'Exo 2', sans-serif;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s;
    letter-spacing: 1px;
    box-shadow: 0 2px 3px rgba(0,0,0,0.25), inset 0 1px 0 rgba(255,255,255,0.04);
}

.export-btn:hover {
    border-color: var(--accent-dim);
    color: var(--accent);
}

.export-btn:active {
    box-shadow: inset 0 2px 3px rgba(0,0,0,0.3);
    transform: translateY(1px);
}

.export-btn.active {
    border-color: var(--accent);
    color: var(--accent);
    background: linear-gradient(180deg, #2a2520, #211d19);
    box-shadow: inset 0 2px 3px rgba(0,0,0,0.3), 0 0 6px rgba(212,168,71,0.1);
}

.export-preview {
    flex: 1;
    min-height: 120px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px;
    font-family: 'Fira Code', monospace;
    font-size: 11px;
    color: var(--crt-green);
    resize: none;
    outline: none;
    line-height: 1.5;
    overflow: auto;
    white-space: pre;
    tab-size: 4;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.2);
}

.copy-bar {
    display: flex;
    gap: 6px;
    margin-top: 8px;
}

.copy-btn {
    flex: 1;
    padding: 8px;
    border: 1px solid var(--success);
    background: linear-gradient(180deg, #3a352e, #2a2520);
    color: var(--success);
    font-family: 'Exo 2', sans-serif;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s;
    box-shadow: 0 2px 3px rgba(0,0,0,0.25), inset 0 1px 0 rgba(255,255,255,0.04);
}

.copy-btn:hover {
    background: linear-gradient(180deg, var(--success), #3a7a2a);
    color: var(--bg-primary);
    box-shadow: 0 2px 4px rgba(0,0,0,0.3), 0 0 8px rgba(90,154,68,0.2);
}

.copy-btn:active {
    box-shadow: inset 0 2px 3px rgba(0,0,0,0.3);
    transform: translateY(1px);
}

/* ====== MELODY LOOPER ====== */
.looper-controls {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.looper-field {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--text-secondary);
}

.looper-field input[type="number"] {
    width: 60px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 4px 8px;
    border-radius: 4px;
    font-family: 'Fira Code', monospace;
    font-size: 13px;
    outline: none;
}

.looper-field input[type="number"]:focus {
    border-color: var(--accent);
}

.looper-scale-field {
    margin-left: auto;
}

.looper-scale-field input[type="range"] {
    width: 80px;
    accent-color: var(--accent);
}

/* Track headers */
.looper-track-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 6px 6px 0 0;
    margin-bottom: -1px;
}

.track-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
}

.track-volume {
    width: 60px;
    accent-color: var(--accent);
    cursor: pointer;
}

.track-btn {
    padding: 2px 8px;
    border: 1px solid var(--border);
    background: linear-gradient(180deg, #3a352e, #2a2520);
    color: var(--text-dim);
    font-size: 10px;
    cursor: pointer;
    border-radius: 3px;
    font-family: 'Exo 2', sans-serif;
    letter-spacing: 1px;
    transition: all 0.15s;
    box-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

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

.track-btn:active {
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.3);
    transform: translateY(1px);
}

.track-btn.active-mute {
    color: var(--danger);
    border-color: var(--danger);
}

.track-btn.active-solo {
    color: var(--warning);
    border-color: var(--warning);
}

.track-btn.active-toggle {
    color: var(--accent);
    border-color: var(--accent);
}

/* Track controls strip */
.track-controls-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    padding: 8px 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-top: none;
    font-size: 10px;
    color: var(--text-dim);
    align-items: center;
}

.tc-group {
    display: flex;
    align-items: center;
    gap: 4px;
}

.tc-group label {
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    min-width: 30px;
}

.tc-group select {
    background: var(--bg-input);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 1px 4px;
    border-radius: 3px;
    font-size: 10px;
    outline: none;
}

.tc-slider {
    width: 48px;
    accent-color: var(--accent);
    cursor: pointer;
}

.tc-shift-group .track-btn {
    padding: 2px 5px;
    font-size: 10px;
    min-width: 22px;
    text-align: center;
}

.tc-shift-group .track-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.looper-field input[type="range"] {
    width: 60px;
    accent-color: var(--accent);
}

/* Step grid */
.step-grid-container {
    --cell-w: 28px;
    --cell-h: 20px;
    overflow-x: auto;
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 0 0 6px 6px;
    margin-bottom: 12px;
}

.step-grid {
    display: grid;
    gap: 1px;
    background: var(--border);
    min-width: max-content;
}

.step-cell {
    width: var(--cell-w, 28px);
    height: var(--cell-h, 20px);
    background: var(--bg-input);
    cursor: pointer;
    transition: background 0.1s;
}

.step-cell.black-key {
    background: #16120e;
}

.step-cell.on-path {
    background: var(--path-color, rgba(212,168,71,0.06));
}

.step-cell.black-key.on-path {
    background: var(--path-color-dark, #18140e);
}

.step-cell.sustain {
    background: var(--sustain-color, rgba(212,168,71,0.18)) !important;
}

.step-cell.black-key.sustain {
    background: var(--sustain-color-dark, rgba(212,168,71,0.10)) !important;
}

.step-cell:hover {
    background: var(--accent-glow);
}

.step-cell.active {
    /* active color set inline per track */
}

.step-cell.playing {
    background: var(--warning) !important;
    opacity: 1;
}

.step-cell.bar-start {
    border-left: 2px solid var(--border-light);
}

/* Pitch labels */
.pitch-labels {
    display: flex;
    flex-direction: column;
    gap: 1px;
    margin-right: 4px;
}

.pitch-label {
    height: var(--cell-h, 20px);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 6px;
    font-family: 'Fira Code', monospace;
    font-size: calc(var(--cell-h, 20px) * 0.5);
    color: var(--text-dim);
    white-space: nowrap;
}

.pitch-label.white-key {
    color: var(--text-secondary);
}

/* Chord progression */
.chord-helper {
    display: flex;
    gap: 6px;
    margin-bottom: 16px;
    align-items: center;
    flex-wrap: wrap;
}

.chord-helper label {
    font-size: 12px;
    color: var(--text-secondary);
}

/* ====== EMPTY STATE ====== */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 200px;
    color: var(--text-dim);
    font-size: 14px;
    text-align: center;
    gap: 8px;
}

.empty-state .icon {
    font-size: 32px;
    opacity: 0.3;
}

/* ====== SCROLLBAR ====== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-light);
}

/* ====== TOAST NOTIFICATIONS ====== */
.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--bg-panel);
    border: 1px solid var(--accent);
    color: var(--accent);
    padding: 10px 20px;
    border-radius: 6px;
    font-size: 13px;
    z-index: 999;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.3s;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

/* ====== KEYBOARD HINT ====== */
.keyboard-hint {
    font-size: 10px;
    color: var(--text-dim);
    padding: 8px 16px;
    text-align: center;
    border-top: 1px solid var(--border);
}

kbd {
    display: inline-block;
    padding: 2px 6px 3px;
    font-family: 'Fira Code', monospace;
    font-size: 10px;
    background: linear-gradient(180deg, #3a352e, #2a2520);
    border: 1px solid var(--border);
    border-bottom: 2px solid var(--bevel-dark);
    border-radius: 3px;
    color: var(--text-secondary);
    box-shadow: 0 1px 2px rgba(0,0,0,0.3), inset 0 1px 0 rgba(255,255,255,0.05);
}

/* ====== Keyboard Preview ====== */
.keyboard-preview {
    display: flex;
    align-items: stretch;
    height: 56px;
    margin-bottom: 12px;
    user-select: none;
    gap: 4px;
}

.kb-oct-btn {
    width: 24px;
    flex-shrink: 0;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: linear-gradient(180deg, #3a352e, #2a2520);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 10px;
    transition: all 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 3px rgba(0,0,0,0.25), inset 0 1px 0 rgba(255,255,255,0.04);
}

.kb-oct-btn:hover {
    color: var(--accent);
    border-color: var(--accent-dim);
}

.kb-oct-btn:active {
    box-shadow: inset 0 2px 3px rgba(0,0,0,0.3);
    transform: translateY(1px);
}

.kb-keys {
    flex: 1;
    position: relative;
    display: flex;
    border-radius: 4px;
    overflow: hidden;
    border: 1px solid #5a564e;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.2), 0 1px 0 rgba(255,255,255,0.03);
}

.kb-freq {
    width: 80px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Fira Code', monospace;
    font-size: 9px;
    color: var(--accent);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 4px;
    text-align: center;
    line-height: 1.3;
    white-space: pre-line;
}

.key-white {
    flex: 1;
    background: linear-gradient(180deg, #f0ece4, #e0dcd0, #d4d0c4);
    border-right: 1px solid #b8b4a8;
    cursor: pointer;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 3px;
    font-family: 'Exo 2', sans-serif;
    font-size: 8px;
    color: #888;
    transition: all 0.08s;
    position: relative;
    z-index: 1;
    box-shadow: inset 0 -4px 6px rgba(0,0,0,0.06), inset 0 1px 0 rgba(255,255,255,0.8);
}

.key-white:last-child { border-right: none; }

.key-white:active, .key-white.pressed {
    background: linear-gradient(180deg, #e8c870, #d4a847, #c49838);
    color: #4a3a10;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.15);
    transform: translateY(1px);
}

.key-black {
    position: absolute;
    width: 5.5%;
    height: 60%;
    background: linear-gradient(180deg, #2a2420, #1a1614, #0e0c0a);
    border-radius: 0 0 3px 3px;
    cursor: pointer;
    z-index: 2;
    font-size: 0;
    transition: all 0.08s;
    box-shadow: 0 3px 4px rgba(0,0,0,0.4), inset 0 -1px 0 rgba(255,255,255,0.05);
}

.key-black:active, .key-black.pressed {
    background: linear-gradient(180deg, #5a4830, #3a3020);
    box-shadow: 0 1px 2px rgba(0,0,0,0.3);
    height: 58%;
}

/* ====== QWERTY Piano Toggle ====== */
.qwerty-toggle {
    width: 32px;
    flex-shrink: 0;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: linear-gradient(180deg, #3a352e, #2a2520);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 16px;
    transition: all 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    box-shadow: 0 2px 3px rgba(0,0,0,0.25), inset 0 1px 0 rgba(255,255,255,0.04);
}

.qwerty-toggle:hover {
    border-color: var(--accent-dim);
    color: var(--accent);
}

.qwerty-toggle:active {
    box-shadow: inset 0 2px 3px rgba(0,0,0,0.3);
    transform: translateY(1px);
}

.qwerty-toggle.active {
    background: linear-gradient(180deg, #2a2520, #211d19);
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: inset 0 2px 3px rgba(0,0,0,0.3), 0 0 6px rgba(212, 168, 71, 0.2);
}

/* ====== Draggable Effect Chain ====== */
.control-section[data-draggable] {
    cursor: default;
}

.control-section[data-draggable] .control-section-header {
    cursor: grab;
}

.control-section[data-draggable] .control-section-header:active {
    cursor: grabbing;
}

.control-section.drag-over {
    border-color: var(--accent) !important;
    box-shadow: 0 0 8px var(--accent-glow);
}

.control-section.dragging {
    opacity: 0.4;
}

.chain-order {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-dim);
    color: var(--bg-primary);
    font-family: 'Exo 2', sans-serif;
    font-size: 10px;
    font-weight: 700;
    margin-right: 6px;
    flex-shrink: 0;
}

.drag-handle {
    color: var(--text-dim);
    font-size: 12px;
    margin-right: 4px;
    cursor: grab;
    letter-spacing: 1px;
}

/* Per-effect block colours */
.control-section[data-effect="gain"] {
    border-left: 3px solid #d4a847;
}
.control-section[data-effect="gain"] .chain-order {
    background: #d4a847;
}
.control-section[data-effect="gain"] .control-section-title {
    color: #d4a847;
}

.control-section[data-effect="filter"] {
    border-left: 3px solid #ab47bc;
}
.control-section[data-effect="filter"] .chain-order {
    background: #ab47bc;
}
.control-section[data-effect="filter"] .control-section-title {
    color: #ab47bc;
}

.control-section[data-effect="distortion"] {
    border-left: 3px solid #ff7043;
}
.control-section[data-effect="distortion"] .chain-order {
    background: #ff7043;
}
.control-section[data-effect="distortion"] .control-section-title {
    color: #ff7043;
}

.control-section[data-effect="delay"] {
    border-left: 3px solid #66bb6a;
}
.control-section[data-effect="delay"] .chain-order {
    background: #66bb6a;
}
.control-section[data-effect="delay"] .control-section-title {
    color: #66bb6a;
}

.control-section[data-effect="reverb"] {
    border-left: 3px solid #26c6da;
}
.control-section[data-effect="reverb"] .chain-order {
    background: #26c6da;
}
.control-section[data-effect="reverb"] .control-section-title {
    color: #26c6da;
}

.control-section[data-effect="bitcrusher"] {
    border-left: 3px solid #ec407a;
}
.control-section[data-effect="bitcrusher"] .chain-order {
    background: #ec407a;
}
.control-section[data-effect="bitcrusher"] .control-section-title {
    color: #ec407a;
}

/* ====== RESPONSIVE — TABLET (\u22641024px) ====== */
@media (max-width: 1024px) {
    html {
        overflow: visible;
        height: auto;
    }

    body {
        overflow-x: hidden;
        overflow-y: visible;
        height: auto;
    }

    .app-layout {
        display: flex;
        flex-direction: column;
        height: auto;
        min-height: 100vh;
    }

    .header {
        position: sticky;
        top: 0;
        z-index: 100;
        border-bottom: 2px solid var(--border);
    }

    .sidebar {
        display: flex;
        flex-direction: row;
        overflow: visible;
        border-bottom: 1px solid var(--border);
    }

    .sidebar-section {
        flex: 1;
        overflow-y: auto;
        max-height: 300px;
    }

    .main-panel {
        overflow: visible;
    }

    .right-panel {
        overflow: visible;
    }

    .master-volume input[type="range"] {
        width: 80px;
    }

    .kb-freq {
        width: 60px;
        font-size: 8px;
    }
}

/* ====== RESPONSIVE — MOBILE (\u2264768px) ====== */
@media (max-width: 768px) {

    .app-layout {
        display: flex;
        flex-direction: column;
        height: auto;
        min-height: 100vh;
    }

    /* — Header — */
    .header {
        flex-wrap: wrap;
        padding: 6px 10px;
        gap: 6px;
        height: auto;
        min-height: 44px;
        position: sticky;
        top: 0;
        z-index: 100;
        border-bottom: 2px solid var(--border);
    }

    .header-logo {
        font-size: 14px;
        letter-spacing: 1px;
    }

    .mode-tabs {
        order: 0;
    }

    .mode-tab {
        padding: 6px 12px;
        font-size: 11px;
        letter-spacing: 0.5px;
    }

    .header-controls {
        gap: 6px;
        margin-left: auto;
    }

    .master-volume span {
        display: none;
    }

    .master-volume input[type="range"] {
        width: 50px;
    }

    .undo-btn, .redo-btn {
        width: 32px;
        height: 32px;
        font-size: 14px;
    }

    .play-btn, .stop-btn {
        width: 38px;
        height: 38px;
        font-size: 15px;
    }

    /* — Sidebar — */
    .sidebar {
        flex-direction: column;
        max-height: none;
        overflow-y: visible;
        overflow: visible;
        border-bottom: 2px solid var(--border);
    }

    .sidebar-section {
        padding: 0;
        max-height: none;
    }

    .sidebar-title {
        padding: 10px 12px;
        font-size: 10px;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: space-between;
        border-bottom: 1px solid var(--border);
        user-select: none;
    }

    .sidebar-title::after {
        content: '\25BC';
        font-size: 8px;
        color: var(--text-dim);
        transition: transform 0.2s;
    }

    .sidebar-title.collapsed::after {
        transform: rotate(-90deg);
    }

    .sidebar-body {
        transition: max-height 0.3s ease, opacity 0.2s ease;
        overflow: hidden;
    }

    .sidebar-body.collapsed {
        max-height: 0 !important;
        opacity: 0;
        overflow: hidden;
    }

    /* Presets start collapsed on mobile */
    #presetsSection {
        overflow: hidden !important;
    }

    .layer-item {
        padding: 10px 12px;
        font-size: 13px;
    }

    .layer-actions {
        padding: 6px 10px;
        flex-wrap: wrap;
        gap: 8px;
    }

    .layer-actions button {
        padding: 10px 8px;
        font-size: 12px;
        min-height: 40px;
    }

    .preset-save-btn {
        padding: 12px;
        font-size: 13px;
        min-height: 44px;
    }

    .preset-category-title {
        padding: 10px 12px 6px;
        font-size: 12px;
    }

    .preset-item {
        padding: 8px 12px;
        font-size: 13px;
    }

    .keyboard-hint {
        display: none;
    }

    /* — Main Panel — */
    .main-panel {
        padding: 12px;
        min-height: 50vh;
        overflow-y: visible;
        overflow: visible;
    }

    .control-section {
        padding: 12px;
        margin-bottom: 12px;
    }

    .section-toggle {
        width: 34px;
        height: 34px;
    }

    .section-toggle::after {
        width: 12px;
        height: 12px;
    }

    .knob-row {
        gap: 6px 10px;
        justify-content: center;
    }

    .knob-group {
        min-width: 72px;
    }

    synth-knob {
        width: 56px;
        height: 56px;
    }

    .knob-group label,
    .knob-group .control-label {
        font-size: 9px;
    }

    .knob-group .control-value,
    .knob-group .value-display {
        font-size: 10px;
    }

    .control-row label {
        min-width: 60px;
        font-size: 11px;
    }

    /* Keyboard preview */
    .keyboard-preview {
        height: 48px;
        margin-bottom: 8px;
    }

    .kb-oct-btn {
        width: 26px;
        font-size: 10px;
        min-height: 36px;
    }

    .kb-freq {
        width: 56px;
        font-size: 9px;
    }

    .kb-toggle {
        width: 38px;
        font-size: 14px;
        min-height: 36px;
    }

    /* — Right Panel — */
    .right-panel {
        border-top: 2px solid var(--border);
        overflow-y: visible;
        overflow: visible;
    }

    .visualizer-canvas {
        height: 80px;
    }

    .xy-pad-canvas {
        height: 180px;
    }

    .xy-pad-axes {
        flex-direction: column;
        gap: 4px;
    }

    /* — Looper — */
    .looper-controls {
        gap: 8px;
    }

    .looper-field {
        font-size: 11px;
    }

    .looper-scale-field {
        margin-left: 0;
    }

    .looper-track-header {
        flex-wrap: wrap;
        gap: 6px;
        padding: 8px 10px;
    }

    .track-controls-strip {
        gap: 8px;
    }

    .track-btn {
        padding: 6px 10px;
        font-size: 11px;
        min-height: 32px;
    }

    .tc-shift-group .track-btn {
        padding: 4px 8px;
        font-size: 11px;
        min-width: 28px;
        min-height: 32px;
    }

    .step-grid-container {
        --cell-w: 22px;
        --cell-h: 16px;
    }

    .pitch-label {
        font-size: 7px;
        padding-right: 2px;
    }

    /* — Export — */
    .export-buttons {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }

    .export-btn {
        padding: 12px 8px;
        font-size: 13px;
        min-height: 44px;
    }

    .copy-btn {
        padding: 12px;
        font-size: 13px;
        min-height: 44px;
    }

    .export-preview {
        max-height: 200px;
        font-size: 10px;
    }

    /* — Toast — */
    .toast {
        left: 12px;
        right: 12px;
        bottom: 12px;
        text-align: center;
    }
}

/* ====== RESPONSIVE — SMALL MOBILE (\u2264480px) ====== */
@media (max-width: 480px) {
    .header-logo {
        font-size: 14px;
    }

    .mode-tab {
        font-size: 11px;
        padding: 5px 6px;
        letter-spacing: 0.5px;
    }

    .main-panel {
        padding: 8px;
    }

    .control-section {
        padding: 8px;
        border-radius: 6px;
    }

    .control-section-title {
        font-size: 11px;
    }

    .knob-group label,
    .knob-group .control-label {
        font-size: 8px;
    }

    .knob-group {
        min-width: 64px;
    }

    synth-knob {
        width: 48px;
        height: 48px;
    }

    .keyboard-preview {
        height: 40px;
    }

    .key-white {
        font-size: 7px;
    }

    .kb-oct-btn {
        width: 18px;
    }

    .kb-freq {
        display: none;
    }

    .looper-controls {
        gap: 6px;
        font-size: 10px;
    }

    .looper-field input[type="number"] {
        width: 48px;
        font-size: 11px;
    }

    .step-grid-container {
        --cell-w: 18px;
        --cell-h: 14px;
    }

    .chord-helper {
        flex-wrap: wrap;
        gap: 4px;
    }

    .xy-pad-canvas {
        height: 150px;
    }

    .visualizer-canvas {
        height: 60px;
    }
}