:root {
    --dark-bg: #20262B;
    --dark-surface: #2A3137;
    --dark: #37424a;
    --light: #D5DCE0;
    --accent: #54B76E;
    --accent-glow: rgba(84, 183, 110, 0.2);
    --error: #E57373;
    --success: #81C784;
    --warning: #FFB74D;
}

body {
    background: var(--dark-bg);
    color: var(--light);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Prevent body scroll when modal is active */
body.no-scroll {
    overflow: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.header-image {
    margin-bottom: 2.5rem;
    border-radius: 12px;
    overflow: hidden;
    background: url('header-background.png') center center / cover;
    position: relative;
    height: 220px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0,0,0,0.4);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.header-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to top, rgba(18, 18, 18, 0.9), rgba(18, 18, 18, 0.3));
}

.header-content {
    position: relative;
    z-index: 1;
    color: white;
    text-shadow: 0 2px 12px rgba(0,0,0,0.6);
}

h1 {
    font-size: 2rem;
    font-weight: 700;
    margin: 0;
    color: var(--accent);
}

.subtitle {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.7);
    margin: 0.25rem 0 0;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.main-header {
    background: url('header-background.png') center center / cover;
    background-attachment: fixed; /* Parallax effect */
    color: #fff;
    padding: 4rem 1rem;
    text-align: center;
    position: relative;
    margin-bottom: 2rem;
    border-bottom: 1px solid rgba(84, 183, 110, 0.2);
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.main-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to top, rgba(18, 18, 18, 0.85), rgba(18, 18, 18, 0.4));
    z-index: 0;
}

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

.card {
    background: var(--dark-surface);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.card-title {
    margin-top: 0;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: #FFFFFF;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.tabs {
    display: flex;
    margin-bottom: 1.5rem;
    background-color: var(--dark-bg);
    border-radius: 6px;
    padding: 4px;
}

.tab-btn {
    flex: 1;
    padding: 0.5rem 1rem;
    border: none;
    background: transparent;
    color: rgba(255,255,255,0.6);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    font-size: 0.9rem;
    border-radius: 4px;
}

.tab-btn:hover {
    color: var(--light);
    background: rgba(255,255,255,0.05);
}

.tab-btn.active {
    color: var(--dark-bg);
    font-weight: 700;
    background-color: var(--accent);
}

.tab-content {
    margin-top: 1rem;
}

.tab-panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

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

.generation-mode {
    margin-bottom: 2rem;
    text-align: center;
}

.mode-selector {
    display: flex;
    gap: 1rem;
    justify-content: center;
    align-items: center;
    margin-top: 1rem;
}

.separator-text {
    color: rgba(255,255,255,0.4);
    font-style: italic;
    font-size: 0.9rem;
}

.mode-btn {
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--accent);
    background: transparent;
    color: var(--accent);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.mode-btn.active {
    background: var(--accent);
    color: var(--dark);
    font-weight: 700;
}

.mode-btn:hover:not(.active) {
    background: rgba(0, 255, 157, 0.1);
    border-color: var(--accent);
}

.generation-interface {
    display: none;
    animation: fadeIn 0.3s ease;
}

.generation-interface.active {
    display: block;
    margin-top: 2rem;
}

#form-fields-container {
    padding-top: 0;
    margin-top: 0;
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.form-section {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255,255,255,0.08);
}

.form-section:first-child {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.form-section-header {
    margin-top: 0;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--light);
}

.control-group {
    margin-bottom: 1rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.9rem;
    color: rgba(255,255,255,0.7);
}

textarea.form-control {
    min-height: 100px;
    resize: vertical;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border-radius: 4px;
    border: 1px solid rgba(0,0,0,0.2);
    background: var(--dark-bg);
    color: var(--light);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--accent-glow);
    border-color: var(--accent);
    transform: translateY(0);
}

.btn {
    width: 100%;
    padding: 0.75rem;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
    letter-spacing: 0.5px;
}

#generate {
    margin-top: 1rem;
}

#generate-variations {
    padding: 1rem 1.5rem;
    font-size: 1.05rem;
    box-shadow: 0 4px 15px rgba(84, 183, 110, 0.4), 0 0 20px rgba(84, 183, 110, 0.1);
}

#generate-variations:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(84, 183, 110, 0.6), 0 0 30px rgba(84, 183, 110, 0.3);
}

.btn-primary {
    background: var(--accent);
    color: var(--dark-bg);
    box-shadow: 0 2px 8px rgba(84, 183, 110, 0.2);
}

.btn-secondary {
    background: var(--dark);
    border: 1px solid rgba(0,0,0,0.2);
    color: var(--light);
}

.btn-secondary:hover:not(:disabled) {
    background: #45525b;
    border-color: rgba(0,0,0,0.3);
    box-shadow: none;
}

.btn-secondary.active {
    background-color: var(--accent);
    color: var(--dark-bg);
    border-color: var(--accent);
}

.btn-secondary.reset {
    background: var(--warning);
    color: var(--dark-bg);
    border: none;
}

.btn-secondary.reset:hover:not(:disabled) {
    background: #ffc977;
    box-shadow: 0 2px 8px rgba(255, 183, 77, 0.3);
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
}

.btn:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--accent-glow);
}

.status-message {
    padding: 0.75rem 1rem;
    border-radius: 6px;
    margin: 1rem 0 0 0;
    text-align: center;
    font-weight: 500;
    border-left: 3px solid transparent;
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.status-message::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: inherit;
    opacity: 0.1;
    z-index: -1;
}

.loading-message {
    background: rgba(84, 183, 110, 0.15);
    color: var(--accent);
    border-left-color: var(--accent);
    animation: pulse 2s infinite;
}

.error-message {
    background: rgba(229, 115, 115, 0.15);
    color: var(--error);
    border-left-color: var(--error);
}

.success-message {
    background: rgba(129, 199, 132, 0.15);
    color: var(--success);
    border-left-color: var(--success);
}

.info-message {
    background: rgba(255, 255, 255, 0.1);
    color: var(--light);
    border-left-color: rgba(255, 255, 255, 0.3);
}

.warning-message {
    background: rgba(255, 183, 77, 0.15);
    color: var(--warning);
    border-left-color: var(--warning);
}

.visualization-card, .composition-card {
    padding: 1.5rem;
}

.player-card {
    padding: 1rem;
}

.visualization {
    border: 1px solid rgba(0, 0, 0, 0.2);
    border-radius: 6px;
    padding: 0;
    box-shadow: 0 0 15px rgba(84, 183, 110, 0.05) inset;
    position: relative;
    height: 300px;
    background: var(--dark-bg);
    overflow: hidden;
}

.staff-container {
    position: relative;
    height: 100%;
    width: 100%;
    background: transparent;
}

.staff-line {
    position: absolute;
    width: 100%;
    height: 1px;
    background: rgba(84, 183, 110, 0.1);
}

.playhead {
    position: absolute;
    top: 0;
    width: 2px;
    height: 100%;
    background: var(--accent);
    opacity: 0.9;
    z-index: 10;
    pointer-events: none;
    box-shadow: 0 0 8px var(--accent), 0 0 15px var(--accent);
    transition: left 0.05s linear;
}

.track {
    height: 30px;
    margin: 8px 0;
    position: relative;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.05);
}

.note {
    position: absolute;
    height: 12px;
    min-width: 8px;
    border-radius: 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    color: rgba(0, 0, 0, 0.8);
    transition: all 0.2s ease, filter 0.05s linear;
    cursor: pointer;
    border: 1px solid rgba(0,0,0,0.3);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.note:hover {
    transform: scale(1.05);
    z-index: 100;
}

.note.active {
    filter: brightness(1.8) drop-shadow(0 0 8px var(--accent));
    transform: scale(1.02);
    border-color: rgba(255,255,255,0.5);
}

.note-label {
    position: absolute;
    left: -20px;
    color: var(--accent);
    font-size: 10px;
    opacity: 0.7;
    transition: opacity 0.2s ease;
}

.note-label:hover {
    opacity: 1;
}

.loading {
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.8; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.02); }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--dark);
    border: 1px solid rgba(0,0,0,0.2);
    margin: 10px 0;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    border: none;
    transition: transform 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

input[type="range"]:focus {
    outline: none;
}

#player-controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1rem;
}

#transport-controls {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

#transport-controls .btn {
    width: auto;
    flex: 1;
}

.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 10px;
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: 5px;
}

.checkbox-item label {
    margin-bottom: 0;
    color: var(--light);
    font-weight: 400;
    cursor: pointer;
    transition: color 0.2s ease;
    font-size: 0.9rem;
}

.checkbox-item:hover label {
    color: var(--accent);
}

input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 3px;
    background: var(--dark-bg);
    position: relative;
    cursor: pointer;
    transition: all 0.2s ease;
}

input[type="checkbox"]:hover {
    border-color: var(--accent);
}

input[type="checkbox"]:checked {
    background: var(--accent);
    border-color: var(--accent);
}

input[type="checkbox"]:checked::after {
    content: '✓';
    color: var(--dark-bg);
    position: absolute;
    font-size: 12px;
    font-weight: bold;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    line-height: 1;
}

.track-selection {
    margin-top: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.track-selector {
    padding: 5px 10px;
    border-radius: 4px;
    border: 1px solid rgba(0,0,0,0.3);
    background: var(--dark);
    color: var(--light);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.track-selector:hover {
    background: #45525b;
    border-color: rgba(0,0,0,0.4);
}

.track-selector.active {
    background: var(--accent);
    color: var(--dark-bg);
    border-color: var(--accent);
    font-weight: 700;
}

.multi-track-container {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.track-label {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--accent);
    font-weight: 500;
    margin-top: 10px;
}

.track-label::before {
    content: '';
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.track-label.bassline::before { background-color: #ff6b6b; }
.track-label.melody::before { background-color: #4caf50; }
.track-label.chord::before { background-color: #2196f3; }
.track-label.arpeggio::before { background-color: #9c27b0; }
.track-label.strings::before { background-color: #ff9800; }
.track-label.lead::before { background-color: #ffeb3b; }
.track-label.plucks::before { background-color: #00bcd4; }
.track-label.drums::before { background-color: #795548; }
.track-label.keys::before { background-color: #e91e63; }
.track-label.brass::before { background-color: #ff5722; }
.track-label.percussion::before { background-color: #607d8b; }
.track-label.guitar::before { background-color: #8B4513; }
.track-label.pad-textures::before { background-color: #673AB7; }
.track-label.fx-riser::before { background-color: #009688; }

/* Track metadata styles */
.track-metadata {
    margin-bottom: 1rem;
    color: var(--light);
    text-align: left;
}
.track-metadata h2 {
    margin: 0;
    font-size: 1.2rem;
    font-weight: 600;
}
.track-metadata p {
    margin: 0.25rem 0 0;
    font-size: 0.9rem;
    color: rgba(255,255,255,0.7);
}

.example-btn {
    padding: 0.75rem 1rem;
    border: 1px solid rgba(255,255,255,0.1);
    background: var(--dark);
    color: var(--light);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    text-align: center;
}

.example-btn:hover {
    background: var(--accent-glow);
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
}

.variations-interface {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.source-composition-display {
    padding: 1rem;
    background: rgba(84, 183, 110, 0.05);
    border: 1px solid rgba(84, 183, 110, 0.1);
    border-radius: 6px;
}
.source-composition-display h3 {
    margin-top: 0;
    margin-bottom: 0.5rem;
    color: var(--accent);
}
#source-composition-title {
    font-size: 1.1rem;
    display: block;
    margin-bottom: 0.25rem;
}
#source-composition-explanation {
    color: rgba(255,255,255,0.7);
    display: block;
    font-size: 0.9rem;
}

.variation-input-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    align-items: end;
}

.versions-list-container {
    margin-top: 1rem;
}
.versions-list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}
.versions-list-header h3 {
    margin: 0;
    color: var(--light);
    font-size: 1rem;
}
.versions-list-header .btn {
    width: auto;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}
.versions-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.download-all-wrapper {
    margin-top: 1.5rem;
}

.variation-card {
    padding: 1rem 1.5rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 1rem;
    align-items: center;
}
.variation-card h4 {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
}
.variation-card p {
    margin: 0.25rem 0 0;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.7);
}
.variation-card-actions {
    display: flex;
    gap: 0.75rem;
}
.variation-card-actions .btn {
    width: auto;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

#raw-json-input[readonly] {
    background-color: var(--dark-bg);
    cursor: default;
    opacity: 0.8;
    border-color: rgba(0,0,0,0.4);
}

.variation-display {
    margin-top: 2rem;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.variation-display h3 {
    margin-top: 0;
    color: var(--accent);
    font-size: 1.2rem;
}

.piano-roll-interface {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.file-upload-area {
    position: relative;
    border: 2px dashed rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.02);
}

.file-upload-area:hover {
    border-color: var(--accent);
    background: rgba(84, 183, 110, 0.05);
}

.file-upload-area.dragover {
    border-color: var(--accent);
    background: rgba(84, 183, 110, 0.1);
    transform: scale(1.02);
}

.file-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 2;
}

.upload-placeholder p {
    margin: 0 0 0.5rem 0;
    color: var(--light);
    font-weight: 500;
}

.upload-placeholder small {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.85rem;
}

.image-preview {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.image-preview img {
    max-width: 100%;
    max-height: 300px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-remove {
    position: absolute;
    top: -10px;
    right: -10px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--error);
    color: white;
    border: none;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    transition: all 0.2s ease;
}

.btn-remove:hover {
    background: #ff5252;
    transform: scale(1.1);
}

.piano-roll-settings {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.piano-roll-results {
    padding: 1.5rem;
    background: rgba(84, 183, 110, 0.05);
    border: 1px solid rgba(84, 183, 110, 0.1);
    border-radius: 8px;
    margin-top: 1rem;
}

.piano-roll-results h3 {
    margin-top: 0;
    color: var(--accent);
    font-size: 1.2rem;
}

.analysis-info {
    background: rgba(255, 255, 255, 0.05);
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--light);
}

.analysis-notation-box {
    background: rgba(0, 0, 0, 0.2);
    padding: 0.75rem;
    border-radius: 4px;
    margin-top: 0.5rem;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    white-space: pre-wrap;
    max-height: 150px;
    overflow-y: auto;
    border: 1px solid rgba(0,0,0,0.3);
    color: var(--accent);
}

.variation-controls {
    display: flex;
    gap: 1rem;
    align-items: end;
}

.variation-controls .control-group {
    flex: 1;
}

.variation-controls .btn {
    width: auto;
    padding: 0.75rem 1.5rem;
    white-space: nowrap;
}

/* Tutorial Modal Styles */
.modal {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 9999; /* Sit on top, ensuring it's above all other content and highlights */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgba(0,0,0,0.8); /* Black w/ opacity */
    backdrop-filter: blur(5px); /* Blur background */
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.modal.active {
    display: flex; /* Show when active */
}

.modal-content {
    background-color: var(--dark-surface);
    margin: 10% auto; /* 10% from the top and centered */
    padding: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    width: 90%; /* Could be more responsive */
    max-width: 600px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.5);
    position: relative;
    animation: slideIn 0.3s ease-out;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.modal-content h2 {
    color: var(--accent);
    margin-top: 0;
    margin-bottom: 1rem;
    font-size: 1.8rem;
    font-weight: 700;
    text-align: center;
}

#tutorial-body {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--light);
    flex-grow: 1;
}

#tutorial-body p {
    margin-bottom: 1rem;
}

#tutorial-body strong {
    color: var(--accent);
}

.close-button {
    color: #aaa;
    position: absolute;
    top: 15px;
    right: 25px;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s ease;
}

.close-button:hover,
.close-button:focus {
    color: var(--light);
}

.modal-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1.5rem;
    gap: 0.5rem;
    flex-wrap: wrap;
}

#tutorial-progress {
    color: rgba(255,255,255,0.6);
    font-size: 0.9rem;
    font-weight: 500;
    min-width: 80px; /* Ensure space for text */
}

.modal-footer .btn {
    flex: 1;
    min-width: 100px;
}

.modal-footer #skip-tutorial {
    background-color: transparent;
    border: 1px solid rgba(255,255,255,0.2);
    color: rgba(255,255,255,0.7);
}
.modal-footer #skip-tutorial:hover {
    background-color: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.3);
    box-shadow: none;
}

.tutorial-btn {
    margin-top: 1.5rem;
    width: auto;
    padding: 0.5rem 1.5rem;
    background-color: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    font-size: 0.9rem;
    color: var(--light);
    box-shadow: none;
}

.tutorial-btn:hover {
    background-color: rgba(255,255,255,0.2);
    border-color: var(--accent);
    color: var(--accent);
}

/* Highlight for tutorial steps */
.tutorial-highlight {
    border: 2px solid var(--accent) !important;
    box-shadow: 0 0 10px var(--accent-glow), 0 0 20px var(--accent-glow);
    transition: all 0.3s ease-out;
    position: relative;
    /* This z-index is lower than the modal's z-index, allowing the modal to overlay. */
    /* The highlight effect will still be visible through the modal's transparent background. */
    z-index: 1; /* Changed from 1001 to ensure it stays below the modal overlay */
    transform: scale(1.01);
}

.mixer-panel {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 8px;
    padding: 1rem;
    margin: 1rem 0;
}

.mixer-tracks {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    max-height: 400px;
    overflow-y: auto;
}

.mixer-track {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 6px;
    padding: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    min-height: 300px;
}

.mixer-track-name {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--accent);
    text-align: center;
    margin-bottom: 0.5rem;
    padding-bottom: 0.25rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.mixer-fader-group {
    display: flex;
    gap: 8px;
    height: 100px;
    margin-bottom: 0.5rem;
}

.mixer-control {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.mixer-control.volume-control {
    flex: 1;
    display: flex;
    align-items: center;
}

.mixer-control label {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 0.25rem;
}

.mixer-control .form-control {
    padding: 0.5rem;
    font-size: 0.8rem;
    background: var(--dark-bg);
    border-color: rgba(0,0,0,0.4);
}

/* Vertical slider styles */
input[type="range"][orient="vertical"] {
    -webkit-appearance: slider-vertical;
    writing-mode: bt-lr; /* IE */
    width: 8px;
    height: 100%;
    padding: 0 5px;
    background: var(--dark);
    border: 1px solid rgba(0,0,0,0.2);
    margin: 0;
}

input[type="range"][orient="vertical"]::-webkit-slider-thumb {
    width: 20px;
    height: 10px;
}

input[type="range"][orient="vertical"]::-moz-range-thumb {
    width: 20px;
    height: 10px;
}

.mixer-control input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 4px;
    background: var(--dark);
    border: 1px solid rgba(0,0,0,0.2);
    margin: 0;
}

.mixer-control input[type="range"]::-webkit-slider-thumb {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    border: none;
}

.mixer-control input[type="range"]::-moz-range-thumb {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    border: none;
}

.mixer-buttons {
    display: flex;
    gap: 0.25rem;
    justify-content: center;
}

.mixer-btn {
    padding: 0.25rem 0.5rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: transparent;
    color: rgba(255, 255, 255, 0.7);
    border-radius: 3px;
    cursor: pointer;
    font-size: 0.7rem;
    transition: all 0.2s ease;
    flex: 1;
}

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

.mixer-btn.active {
    background: var(--accent);
    color: var(--dark-bg);
    border-color: var(--accent);
}

.mixer-value {
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.5);
    text-align: center;
    min-height: 1rem;
}

.mixer-value.volume-display {
    margin-top: -0.5rem;
    font-size: 0.8rem;
    color: var(--light);
}

#mixer-mode-toggle {
    display: flex;
    justify-content: center;
    margin: 1rem 0;
}

#toggle-mixer {
    width: auto;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

@keyframes slideIn {
    from { transform: translateY(-50px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@media (max-width: 900px) {
    .main-content {
        grid-template-columns: 1fr;
    }
    .header-container {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    .modal-content {
        width: 95%;
        margin: 5% auto;
        padding: 1.5rem;
    }
    .modal-footer {
        flex-direction: column;
    }
    .modal-footer .btn {
        width: 100%;
        margin-bottom: 0.5rem; /* Space between stacked buttons */
    }
}