:root {
    --bg-color: #18191A;
    --surface-color: #242526;
    --surface-color-2: #3A3B3C;
    --text-color: #E4E6EB;
    --text-color-secondary: #B0B3B8;
    --primary-color: #2E89FF;
    --primary-color-hover: #57A0FF;
    --danger-color: #ff4444;
    --danger-color-hover: #ff6b6b;
    --white-key-color: #FCFCFC;
    --white-key-active-color: #d1eaff;
    --black-key-color: #2c2c2c;
    --black-key-active-color: #555;
    --border-color: #444;
    --record-indicator-color: #ff4444;
}

body {
    margin: 0;
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
}

#app-container {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 10px 20px;
    box-sizing: border-box;
    gap: 20px;
}

#main-header {
    margin-bottom: 0;
    text-align: center;
}

#main-header h1 {
    font-weight: 600;
    font-size: 2.2rem;
    color: var(--text-color);
    text-shadow: 0 2px 10px rgba(0,0,0,0.5);
    margin-bottom: 2px;
}

.version-text {
    font-size: 0.9rem;
    color: var(--text-color-secondary);
    font-family: 'Roboto Mono', monospace;
}

#piano-container {
    display: flex;
    justify-content: center;
    position: relative;
    background: linear-gradient(to bottom, #222, #111);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.7), inset 0 2px 5px rgba(255,255,255,0.05);
    height: 280px;
    width: auto;
    min-width: 1020px;
    max-width: 1400px;
}

.key {
    border: 1px solid #888;
    box-sizing: border-box;
    border-radius: 0 0 5px 5px;
    cursor: pointer;
    position: relative;
    user-select: none;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: center;
    padding-bottom: 8px;
    transition: all 0.05s ease-out;
}

.key .synth-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 0;
    background-color: var(--primary-color);
    border-radius: 0 0 4px 4px;
    transition: background-color 0.2s ease;
    z-index: 1;
}

.key .label-container {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.key .note-label {
    font-weight: bold;
    font-size: 11px;
    font-family: 'Roboto Mono', monospace;
    display: none;
}

.key.note-labels-visible .note-label {
    display: block;
}

.key .qwerty-label {
    font-size: 14px;
    color: var(--primary-color);
    margin-bottom: 5px;
    font-weight: 700;
    display: none;
    text-transform: uppercase;
}

.key.qwerty-visible .qwerty-label {
    display: block;
}

.white-key {
    width: 30px;
    height: 100%;
    background: linear-gradient(to bottom, var(--white-key-color), #e8e8e8);
    color: #333;
    box-shadow: 0 5px 3px rgba(0,0,0,0.3);
}

.white-key.active {
    background: linear-gradient(to bottom, #d1eaff, #c1daef);
    box-shadow: 0 1px 1px rgba(0,0,0,0.4), inset 0 2px 5px rgba(0,0,0,0.2);
    transform: translateY(2px);
}

.black-key {
    width: 20px;
    height: 65%;
    background: linear-gradient(45deg, #222, #444);
    color: var(--text-color);
    position: absolute;
    top: 0;
    z-index: 10;
    border: 1px solid #000;
    box-shadow: 0 5px 3px rgba(0,0,0,0.4);
}

.black-key .note-label {
    font-size: 10px;
    font-family: 'Roboto Mono', monospace;
}

.black-key.active {
    background: linear-gradient(45deg, #333, #555);
    box-shadow: 0 2px 2px rgba(0,0,0,0.5), inset 0 1px 3px rgba(0,0,0,0.3);
    transform: translateY(2px);
}

#loading-indicator {
    margin-top: 5px;
    font-size: 14px;
    color: var(--primary-color);
    font-weight: bold;
    transition: opacity 0.5s ease-out;
}

#loading-indicator.hidden {
    display: none;
}

#controls-container {
    margin-top: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    justify-content: center;
    align-items: flex-start;
    gap: 15px;
    background-color: var(--surface-color);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    width: 95%;
    max-width: 1400px;
    border: 1px solid var(--border-color);
}

.controls-group-box {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 20px;
    padding: 10px;
}

.color-picker-container {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    overflow: hidden;
    border: 2px solid var(--border-color);
    display: flex;
    justify-content: center;
    align-items: center;
}

#synth-color-picker {
    width: 40px;
    height: 40px;
    border: none;
    background: none;
    cursor: pointer;
    transform: scale(1.5); /* Make the color picker easier to click */
    padding: 0;
    margin: 0;
}

#sheet-button, #file-folder-button {
    background-color: var(--surface-color-2);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    padding: 8px 15px;
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.2s ease;
}

#sheet-button:hover, #file-folder-button:hover {
    background-color: var(--surface-color-2);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

#sheet-music-container, #file-folder-container, #playback-gui, #metronome-container {
    background-color: rgba(24, 25, 26, 0.9);
    backdrop-filter: blur(5px);
    border: 1px solid var(--border-color);
}

#sheet-music-container {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80%;
    max-width: 600px;
    height: 50%;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    z-index: 100;
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
    padding: 0;
}

#sheet-music-container.hidden {
    display: none;
}

#sheet-music-header, #file-folder-header, #playback-header, #metronome-header {
    background-color: var(--surface-color-2);
    border-bottom: 1px solid var(--border-color);
}

#sheet-music-header {
    width: 100%;
    padding: 10px 15px;
    box-sizing: border-box;
    color: var(--text-color);
    cursor: move;
    border-radius: 10px 10px 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

#sheet-music-header span {
    font-weight: bold;
}

#close-sheet-button, #close-file-folder-button, #close-playback-button, #close-metronome-button {
    background: none;
    border: none;
    color: var(--text-color-secondary);
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
    padding: 0 5px;
    transition: color 0.2s ease;
}

#close-sheet-button:hover, #close-file-folder-button:hover, #close-playback-button:hover, #close-metronome-button:hover {
    color: var(--text-color);
}

#sheet-music-editor {
    width: 100%;
    height: 100%;
    background-color: #202123;
    color: var(--text-color);
    border: none;
    border-radius: 0 0 9px 9px;
    padding: 15px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 16px;
    resize: none;
    box-sizing: border-box;
}

.indicator-light {
    width: 20px;
    height: 20px;
    background-color: var(--surface-color-2);
    border-radius: 50%;
    border: 1px solid var(--border-color);
    transition: background-color 0.2s, box-shadow 0.2s;
}

.indicator-light.active {
    background-color: var(--primary-color);
    box-shadow: 0 0 10px var(--primary-color);
}

#record-indicator.active {
    background-color: var(--record-indicator-color);
    box-shadow: 0 0 10px var(--record-indicator-color);
}

.control-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    min-width: 120px;
}

.control-group label {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 500;
    color: var(--text-color-secondary);
}

.volume-control {
    display: flex;
    align-items: center;
    gap: 10px;
}

#volume-percentage {
    min-width: 40px;
    text-align: center;
    font-weight: bold;
    font-size: 16px;
    font-family: 'Roboto Mono', monospace;
}

.button-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.button-group button {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background-color: var(--surface-color-2);
    color: var(--text-color);
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s ease;
}

.button-group button:hover {
    background-color: var(--surface-color-2);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

#transpose-value {
    font-size: 16px;
    font-weight: bold;
    min-width: 25px;
    text-align: center;
    font-family: 'Roboto Mono', monospace;
}

#soundfont-select {
    background-color: var(--surface-color-2);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    padding: 5px 8px;
    font-family: 'Poppins', sans-serif;
    font-size: 13px;
}

/* Toggle Switch CSS */
.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 28px;
}

.switch input:disabled + .slider {
    cursor: not-allowed;
    background-color: #555;
}

.switch input { 
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--surface-color-2);
    transition: .4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
}

input:checked + .slider {
    background-color: var(--primary-color);
}

input:focus + .slider {
    box-shadow: 0 0 1px var(--primary-color);
}

input:checked + .slider:before {
    transform: translateX(22px);
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}

#record-button, #file-folder-button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 10px 20px;
    cursor: pointer;
    font-family: 'Roboto Mono', monospace;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 14px;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(74, 144, 226, 0.3);
}

#record-button:hover, #file-folder-button:hover {
    background-color: var(--primary-color-hover);
    box-shadow: 0 4px 12px rgba(46, 137, 255, 0.4);
    transform: translateY(-1px);
}

#record-button.recording {
    background-color: var(--danger-color);
    box-shadow: 0 2px 8px rgba(255, 68, 68, 0.3);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

#record-timer {
    font-size: 14px;
    color: var(--primary-color);
    font-weight: bold;
    font-family: monospace;
}

.record-controls {
    display: flex;
    gap: 5px;
    margin-top: 5px;
}

.record-controls button {
    padding: 8px 16px;
    font-size: 13px;
    border: none;
    border-radius: 6px;
    background-color: var(--primary-color);
    color: white;
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.2s ease;
}

.record-controls button:hover:not(:disabled) {
    background-color: var(--primary-color-hover);
    transform: translateY(-1px);
}

.record-controls button:disabled {
    background-color: #666;
    cursor: not-allowed;
    opacity: 0.6;
    transform: none;
}

#stop-record-button {
    background-color: var(--danger-color);
}

#stop-record-button:hover:not(:disabled) {
    background-color: var(--danger-color-hover);
}

#save-record-button {
    background-color: #4CAF50;
}

#save-record-button:hover:not(:disabled) {
    background-color: #45a049;
}

#file-folder-container {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80%;
    max-width: 500px;
    height: 60%;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    z-index: 100;
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
    padding: 0;
}

#file-folder-container.hidden {
    display: none;
}

#file-folder-header {
    width: 100%;
    padding: 10px 15px;
    box-sizing: border-box;
    background-color: #333;
    color: var(--text-color);
    cursor: move;
    border-bottom: 1px solid var(--border-color);
    border-radius: 10px 10px 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

#file-folder-header span {
    font-weight: bold;
}

#close-file-folder-button {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
    padding: 0 5px;
}

#close-file-folder-button:hover {
    color: #fff;
}

#file-list {
    flex: 1;
    padding: 15px;
    overflow-y: auto;
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 15px;
    margin: 8px 0;
    background-color: var(--surface-color-2);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.file-item:hover {
    background-color: var(--surface-color-2);
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

.file-item-name {
    font-weight: 500;
    flex-grow: 1;
}

.file-item-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.file-action-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 16px;
    padding: 4px;
    border-radius: 4px;
    transition: all 0.2s ease;
    opacity: 0.7;
}

.file-action-btn:hover {
    opacity: 1;
    background-color: rgba(255, 255, 255, 0.1);
}

.rename-btn {
    color: var(--primary-color);
}

.rename-btn:hover {
    background-color: rgba(46, 137, 255, 0.15);
    color: var(--primary-color-hover);
}

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

.delete-btn:hover {
    background-color: rgba(255, 68, 68, 0.15);
    color: var(--danger-color-hover);
}

#file-name-input-container {
    padding: 15px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 10px;
    align-items: center;
    background-color: var(--surface-color);
}

#file-name-input {
    flex: 1;
    padding: 8px;
    background-color: var(--bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-family: 'Poppins', sans-serif;
}

#file-name-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

#save-file-button, #cancel-save-button {
    padding: 8px 15px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
    font-weight: 500;
}

#save-file-button {
    background-color: var(--primary-color);
    color: white;
}

#cancel-save-button {
    background-color: var(--surface-color-2);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

#cancel-save-button:hover {
    background-color: var(--surface-color-2);
    border-color: var(--primary-color);
}

#playback-gui {
    position: fixed;
    top: 20%;
    left: 50%;
    transform: translateX(-50%);
    width: 400px;
    background-color: rgba(37, 37, 37, 0.98);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    z-index: 50;
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
    padding: 0;
}

#playback-gui.hidden {
    display: none;
}

#playback-header {
    width: 100%;
    padding: 10px 15px;
    box-sizing: border-box;
    background-color: #333;
    color: var(--text-color);
    cursor: move;
    border-bottom: 1px solid var(--border-color);
    border-radius: 10px 10px 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

#playback-header span {
    font-weight: bold;
    font-size: 14px;
}

#close-playback-button {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 20px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
    padding: 0 5px;
}

#close-playback-button:hover {
    color: #fff;
}

#playback-controls {
    padding: 15px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    background-color: var(--surface-color);
    border-radius: 0 0 10px 10px;
}

#playback-controls button {
    padding: 8px 15px;
    border: none;
    border-radius: 5px;
    background-color: var(--primary-color);
    color: white;
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
    font-weight: 500;
    transition: background-color 0.2s ease;
}

#playback-controls button:hover {
    background-color: var(--primary-color-hover);
}

#playback-controls button.hidden {
    display: none;
}

#playback-controls button:disabled {
    background-color: #666;
    cursor: not-allowed;
    opacity: 0.6;
}

#playback-pause-button {
    background-color: #fdd835; /* Yellow */
    color: #333;
}

#playback-pause-button:hover:not(:disabled) {
    background-color: #ffeb3b;
}

#playback-timer {
    margin-left: 15px;
    font-family: 'Roboto Mono', monospace;
    font-weight: bold;
    color: var(--primary-color);
}

#auto-button {
    background-color: var(--surface-color-2);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    padding: 8px 15px;
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 13px;
    transition: all 0.2s ease;
}

#auto-button:hover {
    background-color: var(--surface-color-2);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

#auto-container {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 85%;
    max-width: 800px;
    height: 70%;
    max-height: 500px;
    background-color: rgba(24, 25, 26, 0.9);
    backdrop-filter: blur(5px);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    z-index: 100;
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
    padding: 0;
}

#auto-container.hidden {
    display: none;
}

#auto-header {
    width: 100%;
    padding: 15px 20px;
    box-sizing: border-box;
    background-color: var(--surface-color-2);
    color: var(--text-color);
    cursor: move;
    border-bottom: 1px solid var(--border-color);
    border-radius: 10px 10px 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

#auto-header span {
    font-weight: 600;
}

#close-auto-button {
    background: none;
    border: none;
    color: var(--text-color-secondary);
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
    padding: 0 5px;
    transition: color 0.2s ease;
}

#close-auto-button:hover {
    color: var(--text-color);
}

#auto-content {
    flex: 1;
    display: flex;
    padding: 15px;
    gap: 15px;
    overflow-x: auto;
}

#auto-left-panel {
    flex: 2;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

#auto-left-panel label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-color);
}

#auto-sheet-editor {
    flex: 1;
    background-color: #202123;
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    padding: 15px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 14px;
    resize: none;
    box-sizing: border-box;
}

#auto-right-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.auto-setting {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.auto-setting label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-color);
}

#auto-delay, #auto-keybind {
    padding: 8px;
    background-color: var(--surface-color-2);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-family: 'Poppins', sans-serif;
}

#auto-keybind {
    cursor: pointer;
    text-align: center;
    font-weight: bold;
}

#set-keybind-button {
    padding: 6px 12px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
    font-size: 12px;
    margin-top: 5px;
    transition: all 0.2s ease;
}

#set-keybind-button:hover {
    background-color: var(--primary-color-hover);
}

#synth-board-button {
    background-color: var(--surface-color-2);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    padding: 8px 15px;
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
    font-size: 20px;
    font-weight: bold;
    transition: all 0.2s ease;
}

#synth-board-button:hover {
    background-color: var(--surface-color-2);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

#metronome-button {
    background-color: var(--surface-color-2);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    padding: 6px 12px;
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
    font-size: 20px;
    font-weight: bold;
    transition: all 0.2s ease;
    display: flex;
    justify-content: center;
    align-items: center;
}

#metronome-button img {
    width: 24px;
    height: 24px;
    filter: invert(0.8);
    transition: filter 0.2s ease;
}

#metronome-button:hover {
    border-color: var(--primary-color);
}

#metronome-button:hover img {
    filter: invert(56%) sepia(99%) saturate(1914%) hue-rotate(193deg) brightness(102%) contrast(102%); /* primary color */
}

#metronome-container {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90%;
    max-width: 450px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    z-index: 100;
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
    padding: 0;
}

#metronome-container.hidden {
    display: none;
}

#metronome-header {
    width: 100%;
    padding: 15px 20px;
    box-sizing: border-box;
    color: var(--text-color);
    cursor: move;
    border-radius: 10px 10px 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

#metronome-header span {
    font-weight: 600;
    font-size: 16px;
}

#metronome-content {
    padding: 25px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

#metronome-play-button {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 2px solid var(--primary-color);
    background-color: transparent;
    color: var(--primary-color);
    font-size: 24px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    justify-content: center;
    align-items: center;
}

#metronome-play-button:hover {
    background-color: rgba(46, 137, 255, 0.1);
}

#metronome-play-button.playing {
    background-color: var(--primary-color);
    color: white;
    font-size: 20px;
    border-radius: 8px; /* Square with rounded corners */
}

.bpm-control {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

#metronome-slider {
    width: 100%;
    -webkit-appearance: none;
    appearance: none;
    height: 8px;
    background: var(--surface-color-2);
    outline: none;
    border-radius: 4px;
    cursor: pointer;
}

#metronome-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    cursor: pointer;
    border-radius: 50%;
}

#metronome-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    cursor: pointer;
    border-radius: 50%;
    border: none;
}

.bpm-display {
    display: flex;
    align-items: baseline;
    gap: 8px;
}

#bpm-value {
    font-family: 'Roboto Mono', monospace;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-color);
}

.bpm-label {
    font-size: 0.9rem;
    color: var(--text-color-secondary);
}

#synth-board-container {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90%;
    max-width: 1000px;
    height: 70%;
    max-height: 500px;
    background-color: rgba(24, 25, 26, 0.95);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    z-index: 100;
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
    padding: 0;
}

#synth-board-container.hidden {
    display: none;
}

#synth-board-header {
    width: 100%;
    padding: 15px 20px;
    box-sizing: border-box;
    background-color: var(--surface-color-2);
    color: var(--text-color);
    cursor: move;
    border-bottom: 1px solid var(--border-color);
    border-radius: 10px 10px 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

#synth-board-header span {
    font-weight: 600;
    font-size: 18px;
}

#close-synth-board-button {
    background: none;
    border: none;
    color: var(--text-color-secondary);
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
    padding: 0 5px;
    transition: color 0.2s ease;
}

#close-synth-board-button:hover {
    color: var(--text-color);
}

#synth-board-content {
    flex: 1;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 20px;
    gap: 15px;
    overflow-x: auto;
}

.synth-column {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    min-width: 120px;
    flex: 1;
}

.synth-column h4 {
    color: var(--primary-color);
    margin: 0 0 10px 0;
    font-size: 14px;
    font-weight: 600;
    text-align: center;
}

.synth-column select {
    background-color: var(--surface-color-2);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    padding: 8px;
    font-family: 'Poppins', sans-serif;
    font-size: 12px;
    width: 100%;
    cursor: pointer;
}

.synth-column select:focus {
    outline: none;
    border-color: var(--primary-color);
}

#pitch-shift-slider {
    width: 16px;
    height: 180px;
    background: #3a3a3a;
    outline: none;
    border-radius: 8px;
    cursor: pointer;
    writing-mode: bt-lr;
    -webkit-appearance: slider-vertical;
    border: 1px solid var(--border-color);
}

#pitch-shift-slider::-webkit-slider-thumb {
    appearance: none;
    width: 22px;
    height: 22px;
    background: var(--primary-color);
    border-radius: 3px;
    cursor: pointer;
    border: 1px solid var(--primary-color);
}

#pitch-shift-slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    background: var(--primary-color);
    border-radius: 3px;
    cursor: pointer;
    border: 1px solid var(--primary-color);
}

#pitch-shift-value {
    font-family: 'Roboto Mono', monospace;
    font-weight: bold;
    color: var(--text-color);
    text-align: center;
    font-size: 14px;
}

.pitch-toggle-btn {
    background-color: var(--surface-color-2);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    padding: 6px 12px;
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
    font-size: 12px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.pitch-toggle-btn.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.pitch-toggle-btn:hover {
    border-color: var(--primary-color);
}

#toast-notification {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--primary-color);
    color: white;
    padding: 12px 25px;
    border-radius: 8px;
    z-index: 200;
    font-weight: 500;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
    transition: opacity 0.3s, transform 0.3s;
}

#toast-notification.hidden {
    opacity: 0;
    transform: translate(-50%, 20px);
    pointer-events: none;
}

#help-button {
    position: fixed;
    top: 20px;
    left: 20px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: white;
    border: none;
    font-size: 20px;
    font-weight: bold;
    cursor: pointer;
    z-index: 1000;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(46, 137, 255, 0.3);
}

#help-button:hover {
    background-color: var(--primary-color-hover);
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(46, 137, 255, 0.4);
}

#help-container {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90%;
    max-width: 600px;
    height: 80%;
    max-height: 700px;
    background-color: rgba(24, 25, 26, 0.95);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    z-index: 1001;
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
    padding: 0;
}

#help-container.hidden {
    display: none;
}

#help-header {
    width: 100%;
    padding: 15px 20px;
    box-sizing: border-box;
    background-color: var(--surface-color-2);
    color: var(--text-color);
    border-bottom: 1px solid var(--border-color);
    border-radius: 10px 10px 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

#help-header span {
    font-weight: 600;
}

#close-help-button {
    background: none;
    border: none;
    color: var(--text-color-secondary);
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
    padding: 0 5px;
    transition: color 0.2s ease;
}

#close-help-button:hover {
    color: var(--text-color);
}

#help-content {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    color: var(--text-color);
    line-height: 1.6;
}

#help-content h3 {
    color: var(--primary-color);
    margin-top: 25px;
    margin-bottom: 15px;
    font-size: 16px;
    font-weight: 600;
}

#help-content h3:first-child {
    margin-top: 0;
}

#help-content p {
    margin-bottom: 12px;
    color: var(--text-color-secondary);
}

#help-content strong {
    color: var(--text-color);
    font-weight: 600;
}

#help-content ul {
    margin: 10px 0;
    padding-left: 20px;
}

#help-content li {
    margin-bottom: 8px;
    color: var(--text-color-secondary);
}

#help-content li strong {
    color: var(--primary-color);
}

#device-selection-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    backdrop-filter: blur(5px);
}

#device-selection-modal.hidden {
    display: none;
}

#device-selection-content {
    background-color: var(--surface-color);
    border: 2px solid var(--border-color);
    border-radius: 15px;
    padding: 40px;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
    max-width: 500px;
    width: 90%;
}

#device-selection-content h2 {
    color: var(--text-color);
    font-size: 2rem;
    margin-bottom: 30px;
    font-weight: 600;
}

#device-options {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 20px;
}

.device-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    padding: 25px 20px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    background-color: var(--surface-color-2);
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 120px;
}

.device-option:hover {
    border-color: var(--primary-color);
    background-color: rgba(46, 137, 255, 0.1);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(46, 137, 255, 0.3);
}

.device-option span {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--text-color);
}

.device-icon {
    width: 60px;
    height: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.desktop-icon .monitor {
    width: 50px;
    height: 35px;
    position: relative;
}

.desktop-icon .screen {
    width: 100%;
    height: 30px;
    background-color: var(--text-color);
    border: 2px solid var(--text-color);
    border-radius: 3px;
    position: relative;
}

.desktop-icon .stand {
    width: 20px;
    height: 8px;
    background-color: var(--text-color);
    margin: 2px auto 0;
    border-radius: 0 0 3px 3px;
}

.mobile-icon .phone {
    width: 30px;
    height: 50px;
    background-color: var(--text-color);
    border-radius: 8px;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.mobile-icon .phone-screen {
    width: 22px;
    height: 38px;
    background-color: var(--surface-color);
    border-radius: 4px;
}

/* Mobile-specific styles */
body.mobile-mode {
    font-size: 14px;
}

body.mobile-mode #app-container {
    padding: 5px 10px;
    gap: 10px;
    height: 100vh;
    overflow-y: auto;
}

body.mobile-mode #main-header h1 {
    font-size: 1.8rem;
    margin: 10px 0;
}

body.mobile-mode #piano-container {
    height: 200px;
    min-width: auto;
    max-width: 100%;
    padding: 10px;
    overflow-x: auto;
    overflow-y: hidden;
}

body.mobile-mode .key {
    border-radius: 0 0 3px 3px;
}

body.mobile-mode .white-key {
    width: 25px;
    height: 100%;
}

body.mobile-mode .black-key {
    width: 16px;
    height: 60%;
}

body.mobile-mode .key .qwerty-label {
    font-size: 10px;
    margin-bottom: 3px;
}

body.mobile-mode .key .note-label {
    font-size: 9px;
}

body.mobile-mode #controls-container {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 15px;
    width: 98%;
}

body.mobile-mode .controls-group-box {
    gap: 15px;
    padding: 8px;
}

body.mobile-mode .control-group {
    min-width: 100px;
}

body.mobile-mode .control-group label {
    font-size: 11px;
}

body.mobile-mode #help-button {
    width: 35px;
    height: 35px;
    top: 10px;
    left: 10px;
    font-size: 16px;
}

body.mobile-mode #help-container,
body.mobile-mode #synth-board-container,
body.mobile-mode #auto-container,
body.mobile-mode #sheet-music-container,
body.mobile-mode #file-folder-container {
    width: 95%;
    height: 85%;
    position: fixed;
}

body.mobile-mode .controls-group-box {
    gap: 12px;
    padding: 10px;
}

body.mobile-mode .control-group {
    min-width: 90px;
}

body.mobile-mode .control-group label {
    font-size: 12px;
}

body.mobile-mode .button-group button {
    width: 28px;
    height: 28px;
    font-size: 16px;
}

.auto-control-button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 10px 20px;
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 13px;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(46, 137, 255, 0.3);
}

.auto-control-button:hover {
    background-color: var(--primary-color-hover);
    box-shadow: 0 4px 12px rgba(46, 137, 255, 0.4);
    transform: translateY(-1px);
}

#rename-dialog {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 200;
}

#rename-dialog.hidden {
    display: none;
}

.rename-dialog-content {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    min-width: 300px;
}

.rename-dialog-content h3 {
    margin: 0 0 20px 0;
    color: var(--text-color);
    font-size: 18px;
    font-weight: 600;
    text-align: center;
}

#rename-input {
    width: 100%;
    padding: 10px;
    background-color: var(--bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-family: 'Poppins', sans-serif;
    margin-bottom: 20px;
    box-sizing: border-box;
}

#rename-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.rename-dialog-buttons {
    display: flex;
    gap: 10px;
    justify-content: center;
}

#confirm-rename-button, #cancel-rename-button {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
    font-weight: 500;
    font-size: 14px;
    transition: all 0.2s ease;
}

#confirm-rename-button {
    background-color: var(--primary-color);
    color: white;
}

#confirm-rename-button:hover {
    background-color: var(--primary-color-hover);
}

#cancel-rename-button {
    background-color: var(--surface-color-2);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

#cancel-rename-button:hover {
    background-color: var(--surface-color-2);
    border-color: var(--primary-color);
}

#invert-sustain-button {
    background-color: var(--surface-color-2);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    padding: 8px 12px;
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
    font-size: 12px;
    font-weight: 500;
    transition: all 0.2s ease;
}

#invert-sustain-button:hover {
    background-color: var(--surface-color-2);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

#invert-sustain-button.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.pitch-shift-column {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    min-width: 120px;
    flex: 1;
}

body.mobile-mode #synth-board-content .pitch-shift-column {
    width: 100%;
    flex-direction: row;
    justify-content: center;
    gap: 20px;
}

body.mobile-mode #pitch-shift-slider {
    width: 220px;
    height: 14px;
    writing-mode: initial;
    -webkit-appearance: initial;
    background: #3a3a3a;
    border-radius: 6px;
}

body.mobile-mode #pitch-shift-slider::-webkit-slider-thumb {
    width: 18px;
    height: 18px;
    border-radius: 2px;
}

body.mobile-mode #pitch-shift-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 2px;
}

@media (max-width: 768px) {
    #device-options {
        flex-direction: column;
        gap: 20px;
    }
    
    .device-option {
        min-width: auto;
        width: 100%;
    }
    
    #device-selection-content {
        padding: 30px 20px;
    }
}

#velocity-control-group {
    display: flex;
}

body.mobile-mode #velocity-control-group {
    display: none !important;
}