:root {
    --bg-dark: #0a0a0f;
    --panel-bg: rgba(15, 15, 25, 0.75);
    --panel-border: rgba(255, 255, 255, 0.1);
    
    --accent-primary: #00f3ff;
    --accent-secondary: #ff00ea;
    --accent-glow: rgba(0, 243, 255, 0.5);
    
    --text-main: #f0f0f0;
    --text-muted: #8a8a9a;
    
    --grid-bg: rgba(0, 0, 0, 0.4);
    --grid-border: rgba(255, 255, 255, 0.05);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
    user-select: none;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    height: 100vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    padding-bottom: 190px; /* Space for 2-row keyboard synth panel */
}

/* Glassmorphism utility */
.glass-panel {
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--panel-border);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

/* Header */
.top-bar {
    height: 60px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
    background: linear-gradient(180deg, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0) 100%);
    z-index: 10;
}

.brand-title {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 1px;
    text-transform: uppercase;
    background: -webkit-linear-gradient(45deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    display: flex;
    align-items: center;
    gap: 10px;
}

.lang-btn {
    background: rgba(255,255,255,0.1);
    border: 1px solid var(--panel-border);
    color: var(--text-main);
    padding: 5px 15px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.lang-btn:hover {
    background: rgba(255,255,255,0.2);
    box-shadow: 0 0 10px var(--accent-glow);
}

/* Main Layout */
.main-layout {
    display: flex;
    flex: 1;
    position: relative;
    overflow: hidden;
}

/* Panels */
.panel {
    width: 380px;
    min-width: 300px;
    z-index: 5;
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    gap: 1.5rem;
    overflow-y: auto;
}
.panel::-webkit-scrollbar {
    width: 5px;
}
.panel::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 10px;
}

.left-panel {
    border-right: 1px solid var(--panel-border);
    border-top-right-radius: 15px;
}

.right-panel {
    border-left: 1px solid var(--panel-border);
    border-top-left-radius: 15px;
}

.panel h2 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    border-bottom: 1px solid var(--panel-border);
    padding-bottom: 0.5rem;
}

/* Center Stage */
.center-stage {
    flex: 1;
    position: relative;
    background: radial-gradient(circle at center, #1a1a2e 0%, #000 100%);
}

#stage-container canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100% !important;
    height: 100% !important;
}

/* Transport Controls Overlay */
.stage-overlay {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
}

.transport-controls {
    display: flex;
    align-items: center;
    gap: 20px;
    background: rgba(10, 10, 15, 0.85);
    padding: 15px 30px;
    border-radius: 50px;
    border: 1px solid var(--accent-glow);
    box-shadow: 0 0 30px rgba(0, 243, 255, 0.2);
    backdrop-filter: blur(10px);
}

button {
    border: none;
    outline: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 25px;
    padding: 10px 25px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

button:active {
    transform: scale(0.95);
}

.btn-primary {
    background: var(--accent-primary);
    color: #000;
    box-shadow: 0 0 15px var(--accent-glow);
}
.btn-primary:hover {
    background: #fff;
    box-shadow: 0 0 25px var(--accent-glow);
}

.btn-secondary {
    background: rgba(255,255,255,0.1);
    color: var(--text-main);
}
.btn-secondary:hover {
    background: rgba(255,255,255,0.2);
}

.btn-glow {
    background: linear-gradient(45deg, var(--accent-secondary), #9d00ff);
    color: white;
    width: 100%;
    justify-content: center;
    padding: 15px;
    font-size: 1.1rem;
    box-shadow: 0 0 20px rgba(255, 0, 234, 0.4);
}
.btn-glow:hover {
    box-shadow: 0 0 35px rgba(255, 0, 234, 0.8);
    transform: translateY(-2px);
}

.btn-danger {
    background: rgba(255, 50, 50, 0.1);
    color: #ff5555;
    border: 1px solid #ff5555;
    width: 100%;
    justify-content: center;
}
.btn-danger:hover {
    background: rgba(255, 50, 50, 0.3);
}

.bpm-control {
    display: flex;
    flex-direction: column;
    color: var(--text-main);
    font-size: 0.9rem;
    font-weight: 600;
}
.bpm-control input[type=range] {
    accent-color: var(--accent-primary);
    width: 100px;
    margin-top: 5px;
}

/* Sequencer Grid */
.instrument-rack {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.track-row {
    display: flex;
    align-items: center;
    background: rgba(0,0,0,0.5);
    border-radius: 8px;
    padding: 5px;
    border: 1px solid var(--grid-border);
}

.track-info {
    width: 80px;
    font-size: 0.85rem;
    color: var(--accent-primary);
    font-weight: 600;
    padding-left: 5px;
}

.step-grid {
    display: flex;
    gap: 4px;
    flex: 1;
}

.step-btn {
    flex: 1;
    aspect-ratio: 1;
    background: var(--grid-bg);
    border: 1px solid var(--grid-border);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.1s;
}

.step-btn:hover {
    background: rgba(255,255,255,0.2);
}

.step-btn.active {
    background: var(--accent-secondary);
    box-shadow: 0 0 10px var(--accent-secondary);
    border-color: var(--accent-secondary);
}
.step-btn.active-primary {
    background: var(--accent-primary);
    box-shadow: 0 0 10px var(--accent-primary);
    border-color: var(--accent-primary);
}

.step-btn.ghost {
    background: rgba(255, 200, 0, 0.4);
    border-color: #ffc800;
}

.btn-bank {
    background: rgba(255,255,255,0.1);
    color: white;
    border: 1px solid var(--panel-border);
    padding: 5px 12px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
}
.btn-bank.active-bank {
    background: var(--accent-primary);
    color: black;
    box-shadow: 0 0 10px var(--accent-glow);
}

.btn-ms {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--panel-border);
    border-radius: 3px;
    width: 22px;
    height: 22px;
    font-size: 0.65rem;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    padding: 0;
    transition: all 0.1s;
}
.btn-ms:hover {
    background: rgba(255,255,255,0.1);
}
.btn-mute.active-mute { background: #ff3300; color: white; border-color: #ff3300; box-shadow: 0 0 5px #ff3300; }
.btn-solo.active-solo { background: #ffff00; color: black; border-color: #ffff00; box-shadow: 0 0 5px #ffff00; }

/* Right panel controls */
.ai-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.4;
}

.separator {
    height: 1px;
    background: var(--panel-border);
    margin: 10px 0;
}

.visual-controls {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.visual-controls label {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.glass-select {
    background: rgba(0,0,0,0.5);
    color: white;
    border: 1px solid var(--panel-border);
    padding: 10px;
    border-radius: 8px;
    outline: none;
    font-family: inherit;
    cursor: pointer;
}
.glass-select option {
    background: var(--bg-dark);
    color: white;
}

/* Responsive adjustments */
@media (max-width: 1024px) {
    .main-layout {
        flex-direction: column;
    }
    .panel {
        width: 100%;
        max-height: 40vh;
    }
    .left-panel, .right-panel {
        border: none;
        border-radius: 0;
    }
}

/* Zen Mode Rules */
body.zen-mode .panel, 
body.zen-mode .top-bar, 
body.zen-mode .stage-overlay,
body.zen-mode #keyboard-synth-panel {
    display: none !important;
}

body.zen-mode .center-stage {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw !important;
    height: 100vh !important;
    z-index: 9999;
    background: #000;
}

/* =============================================
   PROFESSIONAL KEYBOARD SYNTHESIZER PANEL
   ============================================= */

#keyboard-synth-panel {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 200;
    background: rgba(8, 8, 18, 0.96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid rgba(0, 243, 255, 0.3);
    box-shadow: 0 -4px 40px rgba(0, 243, 255, 0.15);
    user-select: none;
    display: flex;
    flex-direction: column;
    padding: 8px 12px 6px;
    gap: 6px;
}

/* Top controls bar */
#keyboard-synth-panel .ks-top-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: nowrap;
    overflow-x: auto;
}

#keyboard-synth-panel .ks-label {
    font-size: 0.7rem;
    color: var(--accent-primary);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    white-space: nowrap;
}

/* Waveform buttons */
.ks-wave-group {
    display: flex;
    gap: 4px;
}
.ks-wave-btn {
    background: rgba(255,255,255,0.07);
    border: 1px solid rgba(255,255,255,0.15);
    color: var(--text-muted);
    padding: 4px 8px;
    border-radius: 5px;
    font-size: 0.7rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    font-family: 'Outfit', monospace;
}
.ks-wave-btn:hover { background: rgba(0,243,255,0.15); color: #fff; }
.ks-wave-btn.active {
    background: var(--accent-primary);
    color: #000;
    border-color: var(--accent-primary);
    box-shadow: 0 0 10px rgba(0,243,255,0.5);
}

/* Toggle buttons (chord, arp, sustain indicator) */
.ks-toggle-btn {
    background: rgba(255,255,255,0.07);
    border: 1px solid rgba(255,255,255,0.15);
    color: var(--text-muted);
    padding: 4px 10px;
    border-radius: 5px;
    font-size: 0.7rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}
.ks-toggle-btn:hover { background: rgba(255,0,234,0.15); color: #fff; }
.ks-toggle-btn.active {
    background: var(--accent-secondary);
    color: #fff;
    border-color: var(--accent-secondary);
    box-shadow: 0 0 10px rgba(255,0,234,0.5);
}

/* Octave display */
.ks-octave-display {
    display: flex;
    align-items: center;
    gap: 4px;
}
.ks-octave-btn {
    background: rgba(255,255,255,0.07);
    border: 1px solid rgba(255,255,255,0.15);
    color: white;
    width: 24px;
    height: 24px;
    border-radius: 4px;
    font-size: 0.9rem;
    font-weight: 900;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    transition: all 0.15s;
    flex-shrink: 0;
}
.ks-octave-btn:hover { background: rgba(0,243,255,0.25); }
#ks-octave-val {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--accent-primary);
    min-width: 30px;
    text-align: center;
}

/* ADSR sliders */
.ks-adsr-group {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
}
.ks-adsr-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1px;
}
.ks-adsr-item label {
    font-size: 0.6rem;
    color: var(--text-muted);
    font-weight: 700;
    text-transform: uppercase;
}
.ks-adsr-item input[type=range] {
    width: 60px;
    height: 3px;
    accent-color: var(--accent-primary);
    cursor: pointer;
}

/* Velocity indicator */
#ks-vel-display {
    font-size: 0.65rem;
    color: #ffaa00;
    font-weight: 700;
    white-space: nowrap;
}

/* Arp speed select */
#ks-arp-speed {
    background: rgba(0,0,0,0.5);
    color: white;
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 4px;
    padding: 3px 6px;
    font-size: 0.7rem;
    font-family: 'Outfit', sans-serif;
    cursor: pointer;
}

/* Sustain indicator */
#ks-sustain-indicator {
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--text-muted);
    padding: 3px 8px;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 4px;
    transition: all 0.15s;
    white-space: nowrap;
}
#ks-sustain-indicator.active {
    color: #00ffaa;
    border-color: #00ffaa;
    background: rgba(0,255,170,0.15);
    box-shadow: 0 0 8px rgba(0,255,170,0.3);
    animation: ks-sustain-pulse 1s infinite;
}
@keyframes ks-sustain-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

/* Keys container */
#ks-keys-container {
    display: flex;
    justify-content: center;
    position: relative;
    height: 90px;
    overflow: hidden;
}

/* White keys */
.ks-key-white {
    position: relative;
    width: 34px;
    height: 90px;
    background: linear-gradient(180deg, #dde0f0 0%, #fff 60%);
    border: 1px solid rgba(0,0,0,0.4);
    border-top: 2px solid rgba(0,243,255,0.4);
    border-radius: 0 0 6px 6px;
    cursor: pointer;
    flex-shrink: 0;
    transition: background 0.05s, box-shadow 0.05s;
    z-index: 1;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: center;
    padding-bottom: 4px;
}
.ks-key-white .ks-key-label {
    font-size: 0.52rem;
    font-weight: 700;
    color: rgba(0,0,0,0.5);
    pointer-events: none;
    line-height: 1;
}
.ks-key-white .ks-key-kbd {
    font-size: 0.5rem;
    color: rgba(0,100,200,0.6);
    pointer-events: none;
}
.ks-key-white:hover { background: linear-gradient(180deg, #b0eeff 0%, #e0faff 60%); }
.ks-key-white.pressed {
    background: linear-gradient(180deg, #00f3ff 0%, #80faff 60%);
    box-shadow: 0 0 15px rgba(0,243,255,0.8), inset 0 -3px 8px rgba(0,243,255,0.4);
    border-color: #00f3ff;
}

/* Black keys */
.ks-key-black {
    position: absolute;
    width: 22px;
    height: 56px;
    background: linear-gradient(180deg, #222 0%, #111 100%);
    border: 1px solid rgba(0,243,255,0.3);
    border-radius: 0 0 4px 4px;
    cursor: pointer;
    z-index: 2;
    top: 0;
    transition: background 0.05s, box-shadow 0.05s;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: center;
    padding-bottom: 3px;
}
.ks-key-black .ks-key-label {
    font-size: 0.45rem;
    font-weight: 700;
    color: rgba(0,243,255,0.7);
    pointer-events: none;
    line-height: 1;
}
.ks-key-black .ks-key-kbd {
    font-size: 0.4rem;
    color: rgba(100,200,255,0.5);
    pointer-events: none;
}
.ks-key-black:hover { background: linear-gradient(180deg, #333 0%, #222 100%); }
.ks-key-black.pressed {
    background: linear-gradient(180deg, #00aaff 0%, #0066cc 100%);
    box-shadow: 0 0 12px rgba(0,150,255,0.9), inset 0 -2px 6px rgba(0,80,200,0.5);
    border-color: #00aaff;
}

/* step-btn current-step highlight */
.step-btn.current-step {
    outline: 2px solid var(--accent-primary);
    outline-offset: -2px;
}

/* =============================================
   ADVANCED PRO FEATURES — STYLES
   ============================================= */

/* Second control row in keyboard panel */
#keyboard-synth-panel .ks-row2 {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: nowrap;
    overflow-x: auto;
    border-top: 1px solid rgba(255,255,255,0.06);
    padding-top: 5px;
}

/* Scale Lock select */
#ks-scale-select {
    background: rgba(0,0,0,0.5);
    color: var(--accent-primary);
    border: 1px solid rgba(0,243,255,0.3);
    border-radius: 5px;
    padding: 3px 8px;
    font-size: 0.7rem;
    font-family: 'Outfit', sans-serif;
    cursor: pointer;
    font-weight: 700;
}
#ks-scale-lock-btn.active {
    background: var(--accent-primary);
    color: #000;
    border-color: var(--accent-primary);
    box-shadow: 0 0 12px rgba(0,243,255,0.6);
}

/* Harmonizer voice buttons */
.ks-harm-btn {
    background: rgba(255,255,255,0.07);
    border: 1px solid rgba(255,255,255,0.15);
    color: var(--text-muted);
    padding: 3px 8px;
    border-radius: 5px;
    font-size: 0.7rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
}
.ks-harm-btn.active {
    background: #9d00ff;
    color: #fff;
    border-color: #9d00ff;
    box-shadow: 0 0 10px rgba(157,0,255,0.6);
}

/* Emotion buttons */
.ks-emotion-group {
    display: flex;
    gap: 4px;
}
.ks-emotion-btn {
    padding: 3px 9px;
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.15);
    font-size: 0.7rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.25s;
    background: rgba(255,255,255,0.06);
    color: rgba(255,255,255,0.6);
    white-space: nowrap;
}
.ks-emotion-btn:hover { filter: brightness(1.3); transform: translateY(-1px); }
.ks-emotion-btn.active {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(255,255,255,0.2);
    color: #fff;
    border-color: currentColor;
}
.ks-emotion-btn[data-emotion="happy"]   { color: #ffdd00; }
.ks-emotion-btn[data-emotion="sad"]     { color: #4488ff; }
.ks-emotion-btn[data-emotion="tense"]   { color: #ff4400; }
.ks-emotion-btn[data-emotion="dreamy"]  { color: #cc88ff; }
.ks-emotion-btn[data-emotion="rage"]    { color: #ff0044; }
.ks-emotion-btn[data-emotion="zen"]     { color: #00ffaa; }

/* Loop Recorder bars */
#ks-loop-group {
    display: flex;
    gap: 5px;
    align-items: center;
}
.ks-loop-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1px;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 5px;
    padding: 3px 8px;
    cursor: pointer;
    transition: all 0.2s;
    min-width: 44px;
}
.ks-loop-btn:hover { background: rgba(255,255,255,0.12); }
.ks-loop-btn .ks-loop-label {
    font-size: 0.62rem;
    font-weight: 700;
    color: rgba(255,255,255,0.5);
}
.ks-loop-btn .ks-loop-bar {
    width: 36px;
    height: 6px;
    background: rgba(255,255,255,0.08);
    border-radius: 3px;
    overflow: hidden;
    position: relative;
}
.ks-loop-btn .ks-loop-fill {
    height: 100%;
    width: 0%;
    border-radius: 3px;
    transition: width 0.1s linear;
}
.ks-loop-btn.recording .ks-loop-label { color: #ff4444; }
.ks-loop-btn.recording { border-color: #ff4444; animation: loop-rec-pulse 0.6s infinite; }
.ks-loop-btn.playing .ks-loop-label { color: #00ffaa; }
.ks-loop-btn.playing { border-color: #00ffaa; }
@keyframes loop-rec-pulse {
    0%,100% { box-shadow: 0 0 0 0 rgba(255,68,68,0); }
    50%      { box-shadow: 0 0 8px 2px rgba(255,68,68,0.5); }
}
#ks-loop-clear {
    font-size: 0.65rem;
    padding: 3px 7px;
    background: rgba(255,50,50,0.1);
    border: 1px solid rgba(255,50,50,0.3);
    color: #ff8888;
    border-radius: 4px;
    cursor: pointer;
}
#ks-loop-clear:hover { background: rgba(255,50,50,0.25); }

/* Theremin Cursor Overlay */
#theremin-cursor {
    display: none;
    position: fixed;
    pointer-events: none;
    z-index: 9999;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin-left: -20px;
    margin-top: -20px;
    background: radial-gradient(circle, rgba(255,0,234,0.7) 0%, rgba(255,0,234,0) 70%);
    box-shadow: 0 0 20px rgba(255,0,234,0.8);
    transition: transform 0.1s;
}
#theremin-active-bar {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 3px;
    z-index: 9998;
    background: linear-gradient(90deg, #ff00ea, #00f3ff);
    box-shadow: 0 0 10px rgba(255,0,234,0.8);
    animation: theremin-bar-pulse 1s infinite;
}
@keyframes theremin-bar-pulse {
    0%,100% { opacity: 1; } 50% { opacity: 0.5; }
}
#theremin-hint {
    font-size: 0.6rem;
    color: rgba(255,0,234,0.6);
    white-space: nowrap;
    animation: theremin-hint-blink 1s infinite;
}
@keyframes theremin-hint-blink {
    0%,100% { opacity: 1; } 50% { opacity: 0.4; }
}