body {
    font-family: Arial, sans-serif;
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f5f5f5;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.container {
    background-color: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

h1 {
    color: #333;
    text-align: center;
    margin-bottom: 10px;
}

.subtitle {
    text-align: center;
    color: #666;
    margin-bottom: 30px;
}

/* Mode Selection Screen */
.mode-selection-screen {
    display: block;
}

.mode-selection-screen.hidden {
    display: none;
}

.loading-status {
    text-align: center;
    margin: 30px 0;
    padding: 20px;
    border-radius: 10px;
    font-weight: bold;
}

.loading-status.loading {
    background-color: #e3f2fd;
    color: #1565c0;
    border: 2px solid #90caf9;
}

.loading-status.success {
    background-color: #d4edda;
    color: #155724;
    border: 2px solid #c3e6cb;
}

.loading-status.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 2px solid #f5c6cb;
}

.file-structure-help {
    background-color: #f8f9fa;
    border: 2px solid #e9ecef;
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
    font-family: monospace;
    font-size: 14px;
}

/* Instrument Selector */
.instrument-selector {
    margin: 30px 0;
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 10px;
    border: 2px solid #e9ecef;
    display: none;
}

.instrument-selector.show {
    display: block;
}

.instrument-selector h3 {
    text-align: center;
    margin-bottom: 15px;
    color: #495057;
}

.instrument-checkboxes {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.instrument-checkboxes label {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 15px;
    border: 2px solid #ddd;
    border-radius: 8px;
    background-color: white;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.instrument-checkboxes label:hover {
    border-color: #007bff;
    background-color: #f8f9fa;
}

.instrument-checkboxes label input[type="checkbox"] {
    margin: 0;
}

.instrument-checkboxes label input[type="checkbox"]:checked + span {
    color: #007bff;
}

.instrument-checkboxes label.unavailable {
    border-color: #dc3545;
    background-color: #fff5f5;
    color: #721c24;
    cursor: not-allowed;
    opacity: 0.7;
}

#multiInstrumentLabel {
    text-align: center;
    font-weight: bold;
    color: #007700;
    margin: 20px 0;
    font-size: 18px;
}

/* Extreme Mode Selector */
.extreme-mode-selector {
    margin: 30px 0;
    padding: 20px;
    background-color: #fff5f5;
    border-radius: 10px;
    border: 2px solid #ffcdd2;
    display: none;
}

.extreme-mode-selector.show {
    display: block;
}

.extreme-mode-selector h3 {
    text-align: center;
    margin-bottom: 10px;
    color: #d32f2f;
}

.extreme-mode-subtext {
    text-align: center;
    color: #d32f2f;
    margin-bottom: 15px;
    font-style: italic;
}

/* Octave Selector */
.octave-selector {
    margin: 30px 0;
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 10px;
    border: 2px solid #e9ecef;
    display: none;
}

.octave-selector.show {
    display: block;
}

.octave-selector h3 {
    text-align: center;
    margin-bottom: 10px;
    color: #495057;
}

.octave-subtext {
    text-align: center;
    color: #666;
    margin-bottom: 15px;
    font-style: italic;
}

.octave-checkboxes {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.octave-checkboxes label {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 15px;
    border: 2px solid #ddd;
    border-radius: 8px;
    background-color: white;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.octave-checkboxes label:hover {
    border-color: #007bff;
    background-color: #f8f9fa;
}

.octave-checkboxes label input[type="checkbox"] {
    margin: 0;
}

.octave-checkboxes label input[type="checkbox"]:checked + span {
    color: #007bff;
}

#multiOctaveLabel {
    text-align: center;
    font-weight: bold;
    color: #007700;
    margin: 20px 0;
    font-size: 18px;
}

.mode-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.mode-card {
    background-color: white;
    border: 3px solid #ddd;
    border-radius: 15px;
    padding: 25px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.mode-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

.mode-card.available {
    border-color: #28a745;
}

.mode-card.available:hover {
    border-color: #20c997;
    background-color: #f8fff9;
}

.mode-card.coming-soon {
    border-color: #ffc107;
    background-color: #fffbf0;
    cursor: not-allowed;
}

.mode-card.unavailable {
    border-color: #dc3545;
    background-color: #fff5f5;
    cursor: not-allowed;
    opacity: 0.7;
}

.mode-icon {
    font-size: 48px;
    margin-bottom: 15px;
}

.mode-title {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 10px;
    color: #333;
}

.mode-description {
    color: #666;
    margin-bottom: 15px;
    line-height: 1.4;
}

.mode-details {
    font-size: 14px;
    color: #888;
    font-style: italic;
}

.coming-soon-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    background: linear-gradient(45deg, #ffc107, #fd7e14);
    color: white;
    padding: 5px 10px;
    border-radius: 15px;
    font-size: 12px;
    font-weight: bold;
}

.unavailable-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    background: linear-gradient(45deg, #dc3545, #c82333);
    color: white;
    padding: 5px 10px;
    border-radius: 15px;
    font-size: 12px;
    font-weight: bold;
}

/* Game Screen Styles */
.game-screen {
    display: none;
}

.game-screen.active {
    display: block;
}

.game-header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid #e9ecef;
}

.back-to-modes {
    position: absolute;
    top: 20px;
    left: 20px;
    padding: 10px 15px;
    background-color: #6c757d;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
}

.back-to-modes:hover {
    background-color: #5a6268;
}

.cancel-trial {
    position: absolute;
    top: 20px;
    left: 170px;
    padding: 10px 15px;
    background-color: #dc3545;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
}

.cancel-trial:hover {
    background-color: #c82333;
}

.phase-indicator {
    text-align: center;
    margin: 20px 0;
    font-size: 18px;
    font-weight: bold;
    color: #666;
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 8px;
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin: 20px 0;
}

.stat-box {
    text-align: center;
    padding: 10px;
    background-color: white;
    border-radius: 8px;
    border: 2px solid #ddd;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.stat-number {
    font-size: 22px;
    font-weight: bold;
    color: #007bff;
}

.stat-label {
    font-size: 12px;
    color: #666;
    margin-top: 3px;
}

.target-note {
    text-align: center;
    font-size: 57px;
    font-weight: bold;
    margin: 30px 0;
    padding: 10px;
    background-color: white;
    border-radius: 12px;
    border: 3px solid #007bff;
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.controls {
    text-align: center;
    margin: 30px 0;
}

.controls button {
    padding: 20px 40px;
    margin: 0 15px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 20px;
    font-weight: bold;
    transition: all 0.3s ease;
}

.start-btn {
    background-color: #28a745;
    color: white;
    box-shadow: 0 4px 10px rgba(40, 167, 69, 0.3);
}

.start-btn:hover {
    background-color: #218838;
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(40, 167, 69, 0.4);
}

/* Mobile Response Button */
.response-button {
    width: 100%;
    max-width: 250px;
    height: 90px;
    margin: 20px auto;
    display: none;
    background: linear-gradient(135deg, #1e3a8a, #1e40af);
    border: none;
    border-radius: 20px;
    color: white;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.1s ease;
    box-shadow: 0 8px 20px rgba(30, 58, 138, 0.3);
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
    -webkit-tap-highlight-color: transparent;
}

.response-button.show {
    display: block;
}

.response-button:active {
    transform: scale(0.95);
    background: linear-gradient(135deg, #1e40af, #1d4ed8);
    box-shadow: 0 4px 10px rgba(30, 58, 138, 0.5);
}

.response-button:hover {
    background: linear-gradient(135deg, #1e40af, #1d4ed8);
    transform: translateY(-2px);
    box-shadow: 0 12px 25px rgba(30, 58, 138, 0.4);
}

/* Input Method Indicator */
.input-methods {
    text-align: center;
    margin: 15px 0;
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #007bff;
    display: none;
}

.input-methods.show {
    display: block;
}

.input-methods h4 {
    margin: 0 0 10px 0;
    color: #495057;
}

.input-methods p {
    margin: 5px 0;
    color: #6c757d;
    font-size: 14px;
}

/* Randomize Toggle */
.randomize-option {
    text-align: center;
    margin: 20px 0;
    padding: 15px 20px;
    background-color: #f8f9fa;
    border-radius: 10px;
    border: 2px solid #e9ecef;
}

.toggle-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-top: 10px;
}

.toggle-switch {
    position: relative;
    width: 60px;
    height: 30px;
    background-color: #ccc;
    border-radius: 15px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.toggle-switch.active {
    background-color: #007bff;
}

.toggle-switch .slider {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 24px;
    height: 24px;
    background-color: white;
    border-radius: 50%;
    transition: transform 0.3s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.toggle-switch.active .slider {
    transform: translateX(30px);
}

.toggle-label {
    font-weight: bold;
    font-size: 16px;
}

.toggle-description {
    font-size: 14px;
    color: #666;
    margin-top: 0;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    height: 0;
}

/* Fixed Feedback Container */
.feedback-container {
    text-align: center;
    margin: 20px 0;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    border: 2px solid #e9ecef;
    background-color: #f8f9fa;
    transition: all 0.3s ease;
}

.feedback {
    font-weight: bold;
    font-size: 36px;
    opacity: 0;
    transition: opacity 1s ease;
    padding: 20px;
    border-radius: 8px;
    width: 100%;
    text-align: center;
}

.feedback.fade-out {
    opacity: 0 !important;
    transition: opacity 0.2s ease;
}

.feedback.show {
    opacity: 1;
}

.feedback.correct {
    background-color: #d4edda;
    color: #155724;
    border: 2px solid #c3e6cb;
}

.feedback.incorrect {
    background-color: #f8d7da;
    color: #721c24;
    border: 2px solid #f5c6cb;
}

.feedback.empty {
    background-color: transparent;
    color: #6c757d;
    border: none;
    font-style: italic;
}

.mode-badge {
    display: inline-block;
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: bold;
    margin-left: 10px;
}

.mode-badge.naturals {
    background: linear-gradient(45deg, #28a745, #20c997);
}

.mode-badge.chromatic {
    background: linear-gradient(45deg, #6f42c1, #007bff);
}

.mode-badge.multi-octave {
    background: linear-gradient(45deg, #fd7e14, #ffc107);
}

.mode-badge.combined {
    background: linear-gradient(45deg, #e83e8c, #6f42c1);
}

.mode-badge.extreme {
    background: linear-gradient(45deg, #dc3545, #fd7e14);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .container {
        padding: 20px;
    }

    .target-note {
        font-size: 33px;
        padding: 8px;
        margin: 20px 0;
    }

    .response-button {
        height: 100px;
        font-size: 20px;
        margin: 15px auto;
    }

    .stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .mode-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .instrument-checkboxes {
        flex-direction: column;
        align-items: center;
    }

    .instrument-checkboxes label {
        min-width: 200px;
    }

    .octave-checkboxes {
        flex-direction: column;
        align-items: center;
    }
}