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

:root {
    /* Color Scheme - Retro Dark Theme (like FastTracker) */
    --primary-bg: #1a1a1a;
    --secondary-bg: #2a2a2a;
    --tertiary-bg: #3a3a3a;
    --border-color: #4a4a4a;
    --text-primary: #00ff00;
    --text-secondary: #88ff88;
    --accent-color: #ff6600;
    --accent-light: #ffaa00;
    --active-cell: #00ff00;
    --playing-cell: #ff0000;
    --grid-line: #333333;
    --track-1: #0088ff;
    --track-2: #ff00ff;
    --track-3: #ffff00;
}

body {
    background-color: var(--primary-bg);
    color: var(--text-primary);
    font-family: 'Courier New', monospace;
    overflow: hidden;
    height: 100vh;
    touch-action: manipulation;
}

.container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    padding: 10px;
    gap: 10px;
}

/* Header */
.header {
    background-color: var(--secondary-bg);
    border: 2px solid var(--border-color);
    padding: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-radius: 3px;
    box-shadow: 0 0 10px rgba(0, 255, 0, 0.3);
    flex-shrink: 0;
}

.header h1 {
    font-size: 24px;
    font-weight: bold;
    text-shadow: 0 0 10px var(--accent-light);
}

.header-info {
    display: flex;
    gap: 30px;
    font-size: 14px;
    color: var(--text-secondary);
}

/* Main Content */
.main {
    display: flex;
    flex-direction: column;
    gap: 10px;
    flex: 1;
    overflow-y: auto;
    min-height: 0;
}

/* Control Panel */
.control-panel {
    background-color: var(--secondary-bg);
    border: 2px solid var(--border-color);
    padding: 15px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
    border-radius: 3px;
    flex-shrink: 0;
}

.controls-group {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 5px;
    flex-wrap: wrap;
}

.instrument-buttons {
    display: flex;
    gap: 8px;
}

.instrument-btn {
    padding: 8px 12px;
    border: 2px solid var(--border-color);
    background: var(--tertiary-bg);
    color: var(--text-primary);
    cursor: pointer;
    font-family: 'Courier New', monospace;
    border-radius: 3px;
}

.instrument-btn.active {
    background: #7cff7c;
    border-color: #7cff7c;
    color: #1a1a1a;
}

.controls-group label {
    min-width: 100px;
    font-size: 12px;
    text-align: right;
}

.controls-group.midi-controls {
    grid-column: span 2;
}

/* Inputs */
.slider {
    width: 100px;
    height: 20px;
    cursor: pointer;
    background: linear-gradient(to right, var(--tertiary-bg), var(--accent-color));
    border: 1px solid var(--border-color);
    border-radius: 3px;
    -webkit-appearance: none;
    appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--accent-light);
    cursor: pointer;
    border-radius: 2px;
    box-shadow: 0 0 5px var(--accent-light);
}

.slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--accent-light);
    cursor: pointer;
    border-radius: 2px;
    border: none;
    box-shadow: 0 0 5px var(--accent-light);
}

.select {
    background-color: var(--tertiary-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 5px 10px;
    border-radius: 3px;
    cursor: pointer;
    font-family: 'Courier New', monospace;
    min-width: 100px;
}

.select option {
    background-color: var(--secondary-bg);
    color: var(--text-primary);
}

/* Buttons */
.btn {
    padding: 8px 15px;
    border: 2px solid var(--border-color);
    background-color: var(--tertiary-bg);
    color: var(--text-primary);
    cursor: pointer;
    font-family: 'Courier New', monospace;
    font-weight: bold;
    border-radius: 3px;
    transition: all 0.1s;
    font-size: 12px;
    touch-action: manipulation;
}

.btn:hover {
    background-color: var(--border-color);
    box-shadow: 0 0 8px var(--accent-color);
}

.btn:active {
    transform: scale(0.95);
}

.btn-play {
    color: #00ff00;
    border-color: #00ff00;
}

.btn-play:hover {
    box-shadow: 0 0 12px #00ff00;
}

.btn-play.active {
    background-color: #00ff00;
    color: #1a1a1a;
}

.btn-stop {
    color: #ff0000;
    border-color: #ff0000;
}

.btn-stop:hover {
    box-shadow: 0 0 12px #ff0000;
}

.btn-clear {
    color: var(--accent-light);
    border-color: var(--accent-light);
}

.btn-clear:hover {
    box-shadow: 0 0 12px var(--accent-light);
}

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

.btn-secondary:hover {
    box-shadow: 0 0 8px var(--text-secondary);
}

/* Piano Roll Container */
.piano-roll-container {
    display: flex;
    gap: 10px;
    flex: 1;
    background-color: var(--secondary-bg);
    border: 2px solid var(--border-color);
    padding: 10px;
    border-radius: 3px;
    overflow: hidden;
    min-height: 0;
}

.note-labels {
    display: flex;
    flex-direction: column;
    gap: 0;
    min-width: 50px;
    justify-content: flex-start;
    flex-shrink: 0;
}

.note-label {
    width: 50px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--grid-line);
    background-color: var(--tertiary-bg);
    font-size: 11px;
    color: var(--text-secondary);
    font-weight: bold;
}

/* Piano Roll Canvas */
.piano-roll-canvas {
    flex: 1;
    background-color: var(--primary-bg);
    border: 1px solid var(--grid-line);
    cursor: crosshair;
    display: block;
    touch-action: none;
}

/* Track Information */
.track-info {
    background-color: var(--secondary-bg);
    border: 2px solid var(--border-color);
    padding: 15px;
    border-radius: 3px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    flex-shrink: 0;
    flex-wrap: wrap;
}

.track-selector {
    display: flex;
    gap: 10px;
}

.track-btn {
    padding: 8px 15px;
    border: 2px solid var(--border-color);
    background-color: var(--tertiary-bg);
    color: var(--text-primary);
    cursor: pointer;
    font-family: 'Courier New', monospace;
    font-weight: bold;
    border-radius: 3px;
    transition: all 0.1s;
    font-size: 12px;
}

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

.track-btn.active {
    background-color: var(--accent-color);
    color: #1a1a1a;
    box-shadow: 0 0 15px var(--accent-color);
}

.track-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.track-controls label {
    font-size: 12px;
    min-width: 90px;
    text-align: right;
}

.track-instrument {
    font-size: 12px;
    color: #7cff7c;
    padding: 6px 10px;
    border: 1px solid rgba(124, 255, 124, 0.3);
    border-radius: 4px;
    background: rgba(0, 0, 0, 0.2);
    white-space: nowrap;
}

/* Footer */
.footer {
    background-color: var(--secondary-bg);
    border: 2px solid var(--border-color);
    padding: 10px;
    text-align: center;
    font-size: 11px;
    color: var(--text-secondary);
    border-radius: 3px;
    flex-shrink: 0;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-color);
    border-radius: 6px;
}

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

/* Responsive Design for Tablets */
@media (max-width: 1200px) {
    .control-panel {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .header h1 {
        font-size: 20px;
    }
    
    .header-info {
        gap: 15px;
        font-size: 12px;
    }
}

/* Responsive Design for Mobile */
@media (max-width: 768px) {
    .container {
        padding: 5px;
        gap: 5px;
    }
    
    .header {
        padding: 10px;
        flex-direction: column;
        gap: 8px;
    }

    .header h1 {
        font-size: 18px;
    }
    
    .header-info {
        flex-direction: column;
        gap: 8px;
        font-size: 11px;
    }

    .control-panel {
        grid-template-columns: 1fr;
        padding: 10px;
        gap: 10px;
    }
    
    .controls-group {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    
    .controls-group label {
        text-align: left;
        min-width: unset;
    }
    
    .controls-group.midi-controls {
        grid-column: span 1;
    }
    
    .slider {
        width: 100%;
    }
    
    .select {
        width: 100%;
    }
    
    .instrument-buttons {
        width: 100%;
        gap: 5px;
    }
    
    .instrument-btn {
        flex: 1;
        padding: 10px;
        font-size: 11px;
    }

    .piano-roll-container {
        padding: 5px;
        gap: 5px;
        flex-direction: column;
    }
    
    .note-labels {
        min-width: 40px;
        flex-direction: row;
        overflow-x: auto;
        justify-content: flex-start;
    }
    
    .note-label {
        width: 40px;
        height: 30px;
        font-size: 10px;
        padding: 5px;
    }
    
    .piano-roll-canvas {
        min-height: 200px;
    }

    .track-info {
        flex-direction: column;
        align-items: stretch;
        padding: 10px;
        gap: 10px;
    }
    
    .track-selector {
        width: 100%;
        gap: 5px;
    }
    
    .track-btn {
        flex: 1;
        padding: 10px;
        font-size: 11px;
    }
    
    .track-controls {
        width: 100%;
        flex-direction: column;
        align-items: stretch;
    }
    
    .track-controls label {
        text-align: left;
        min-width: unset;
        margin-bottom: 5px;
    }
    
    .track-instrument {
        font-size: 11px;
    }
    
    .footer {
        padding: 8px;
        font-size: 10px;
    }
    
    .btn {
        padding: 10px 12px;
        font-size: 11px;
    }
}

/* Extra Small Devices (< 480px) */
@media (max-width: 480px) {
    .container {
        padding: 3px;
        gap: 3px;
    }
    
    .header {
        padding: 8px;
        gap: 5px;
    }
    
    .header h1 {
        font-size: 16px;
    }
    
    .header-info {
        gap: 5px;
        font-size: 10px;
    }
    
    .control-panel {
        padding: 8px;
        gap: 8px;
    }
    
    .controls-group {
        gap: 5px;
    }
    
    .note-labels {
        min-width: 35px;
    }
    
    .note-label {
        width: 35px;
        height: 25px;
        font-size: 9px;
    }
    
    .piano-roll-canvas {
        min-height: 150px;
    }
    
    .track-info {
        padding: 8px;
        gap: 8px;
    }
    
    .btn {
        padding: 8px 10px;
        font-size: 10px;
    }
}