:root {
    --bg-main: #1c1c1c;
    --bg-panel: #2a2a2b;
    --bg-panel-header: #222222;
    --border-color: #111111;
    --border-highlight: #3a3a3a;
    --text-primary: #f0f0f0;
    --text-secondary: #aaaaaa;
    
    /* Pro Synth Accents */
    --accent: #ff6b00; /* Warm analog orange */
    --accent-hover: #ff8c33;
    --accent-secondary: #00c3ff;
    --danger: #ff4444;
    --success: #00cc66;
    
    --radius-md: 3px;
    --radius-lg: 5px;
    
    --transition-fast: 0.1s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-main);
    background-image: radial-gradient(#333 1px, transparent 1px);
    background-size: 4px 4px;
    color: var(--text-primary);
    min-height: 100vh;
    overflow: hidden;
    user-select: none;
}

.glass-panel {
    background: var(--bg-panel);
    border-top: 1px solid var(--border-highlight);
    border-left: 1px solid var(--border-highlight);
    border-right: 1px solid var(--border-color);
    border-bottom: 2px solid var(--border-color);
    box-shadow: 0 4px 10px rgba(0,0,0,0.5), inset 0 2px 5px rgba(255,255,255,0.05);
    background-image: linear-gradient(to bottom, #2d2d2d, #252525);
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    padding: 0.5rem;
    gap: 0.5rem;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 1.5rem;
    border-radius: var(--radius-md);
    background: var(--bg-panel-header);
}

.logo {
    font-size: 1.2rem;
    font-weight: 800;
    letter-spacing: 1px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo i {
    color: var(--accent);
}

.global-controls, .export-controls {
    display: flex;
    gap: 0.5rem;
}

/* Buttons */
.btn {
    background: linear-gradient(to bottom, #4a4a4a, #2a2a2a);
    border-top: 1px solid #5a5a5a;
    border-left: 1px solid #5a5a5a;
    border-right: 1px solid #1a1a1a;
    border-bottom: 2px solid #111111;
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    gap: 0.4rem;
    text-shadow: 0 1px 1px rgba(0,0,0,0.8);
}

.btn:active {
    background: linear-gradient(to bottom, #2a2a2a, #3a3a3a);
    border-top: 2px solid #111111;
    border-bottom: 1px solid #5a5a5a;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.5);
    transform: translateY(1px);
}

.btn.primary {
    background: linear-gradient(to bottom, var(--accent-hover), var(--accent));
    border-top: 1px solid #ffaa66;
    border-left: 1px solid #ffaa66;
    border-right: 1px solid #cc5500;
    border-bottom: 2px solid #993300;
    color: #fff;
}

.btn.primary:active {
    background: linear-gradient(to bottom, var(--accent), var(--accent-hover));
    border-top: 2px solid #993300;
    border-bottom: 1px solid #ffaa66;
}

.btn.small {
    padding: 0.3rem 0.6rem;
    font-size: 0.8rem;
}

.btn.icon-btn {
    padding: 0.4rem;
    border-radius: var(--radius-md);
    width: 32px;
    height: 32px;
    justify-content: center;
}

/* Workspace */
.workspace {
    display: grid;
    grid-template-columns: 280px 1fr 320px;
    gap: 0.5rem;
    flex: 1;
    min-height: 0;
}

/* Panels */
section {
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-header {
    background: var(--bg-panel-header);
    padding: 0.6rem 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.panel-header h2 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    text-transform: uppercase;
}

/* Center Panel */
.center-panel {
    gap: 0.5rem;
    background: transparent;
    border: none;
    overflow-y: auto;
    padding-right: 0.5rem; /* For scrollbar breathing room */
}

.visualizer-container {
    height: 180px;
    border-radius: var(--radius-md);
    background: #1e1e1e;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0; /* Remove padding so canvas fills */
}

#master-visualizer {
    width: 100%;
    height: 100%;
    display: block;
    cursor: pointer;
}

.editor-container {
    flex: 1;
    border-radius: var(--radius-md);
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    overflow-y: auto;
    position: relative;
}

.empty-state {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

/* Tracks List */
.tracks-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.track-item {
    background: #2d2d2d;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    padding: 0.8rem;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.track-item:hover {
    background: #333333;
}

.track-item.active {
    background: #37373d;
    border-color: #007acc;
}

.track-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.track-name {
    font-weight: 600;
    font-size: 0.85rem;
}

.track-actions {
    display: flex;
    gap: 0.3rem;
}

.track-btn {
    background: #3e3e42;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    width: 24px;
    height: 24px;
    border-radius: 3px;
    font-size: 0.75rem;
    font-weight: bold;
}

.track-btn:hover {
    color: var(--text-primary);
    background: #4e4e52;
}

.track-btn.active.mute { color: #fff; background: var(--danger); }
.track-btn.active.solo { color: #000; background: var(--accent); }
.track-btn.delete:hover { color: #fff; background: var(--danger); }

/* Editor Controls */
.editor-section {
    margin-bottom: 2rem;
}

.editor-section h3 {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.8rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.3rem;
    text-transform: uppercase;
}

.control-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 1.2rem;
}

.control-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
}

.control-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.val-display {
    font-family: monospace;
    font-size: 0.8rem;
    color: var(--accent);
}

/* Custom Range Slider */
input[type=range] {
    -webkit-appearance: none;
    width: 100%;
    background: transparent;
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 14px;
    width: 10px;
    border-radius: 2px;
    background: var(--text-primary);
    cursor: pointer;
    margin-top: -5px;
}

input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 4px;
    cursor: pointer;
    background: #1e1e1e;
    border: 1px solid var(--border-color);
    border-radius: 2px;
}

/* Select Dropdown */
select {
    background: #1e1e1e;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 0.4rem;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.8rem;
    outline: none;
    width: 100%;
}

/* Drawer Container */
.drawer-container {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    flex: 1;
}

#drawer-canvas {
    width: 100%;
    height: auto;
    aspect-ratio: 3/2;
    background: #1e1e1e;
    border: 1px solid var(--border-color);
    cursor: crosshair;
    display: block;
}

.drawer-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.drawer-controls select {
    grid-column: span 2;
}

.preset-waves {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    margin-top: 0.5rem;
    padding-top: 0.8rem;
    border-top: 1px solid var(--border-color);
}

.icon-btn {
    padding: 0.5rem;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 12px;
}
::-webkit-scrollbar-track {
    background: #1e1e1e;
}
::-webkit-scrollbar-thumb {
    background: #424242;
    border: 2px solid #1e1e1e;
    border-radius: 6px;
}
::-webkit-scrollbar-thumb:hover {
    background: #4f4f4f;
}

/* Overlay */
.overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.8);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.overlay.hidden { display: none; }

.spinner {
    width: 40px; height: 40px;
    border: 3px solid #333;
    border-radius: 50%;
    border-top-color: var(--accent);
    animation: spin 1s linear infinite;
}

/* Tooltip */
.info-tooltip {
    display: inline-block;
    margin-left: 0.3rem;
    color: var(--text-secondary);
    cursor: help;
    font-size: 0.8rem;
}

.info-tooltip:hover {
    color: var(--accent);
}

.control-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
}