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

/* Georgia Tech color palette */
:root {
    --color-primary: #B3A369;   /* Tech Gold */
    --color-secondary: #003057; /* GT Navy */
    --color-tertiary: #FFFFFF;  /* White */
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    /* Page background: top (gold) → bottom (blue) */
    background: linear-gradient(to bottom, var(--color-primary) 0%, var(--color-secondary) 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

/* Back Button */
.back-button {
    position: fixed;
    top: 20px;
    left: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.95);
    border: none;
    cursor: pointer;
    font-size: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #4a5568;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
    z-index: 1000;
    line-height: 1;
    padding: 0;
    margin: 0;
    text-decoration: none;
    vertical-align: baseline;
}

.back-button:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
    background: #f0f0f0;
}

/* Info Button */
.info-button {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.95);
    border: none;
    cursor: pointer;
    font-size: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #4a5568;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
    z-index: 1000;
    line-height: 1;
    padding: 0;
    margin: 0;
    vertical-align: baseline;
}

.info-button:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
    background: #f0f0f0;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .back-button,
    .info-button {
        width: 44px;
        height: 44px;
        font-size: 20px;
        top: 15px;
    }

    .back-button {
        left: 15px;
    }

    .info-button {
        right: 15px;
    }
}

/* Info Popup */
.info-popup {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(4px);
}

.info-popup.active {
    display: flex;
}

.info-popup-content {
    background: white;
    border-radius: 20px;
    padding: 40px;
    max-width: 500px;
    width: 90%;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    position: relative;
    animation: slideIn 0.3s ease;
}

.info-popup-close {
    position: absolute;
    top: 10px;
    right: 15px;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    font-size: 36px;
    color: #999;
    cursor: pointer;
    transition: color 0.2s ease;
    line-height: 40px;
    padding: 0;
    margin: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.info-popup-close:hover {
    color: #333;
}

.info-popup-content h2 {
    color: #667eea;
    font-size: 2em;
    margin-bottom: 20px;
}

.info-popup-content h3 {
    color: #4a5568;
    margin-top: 20px;
    margin-bottom: 10px;
    font-size: 1.1em;
}

.info-popup-content p {
    color: #718096;
    line-height: 1.6;
    margin-bottom: 12px;
}

.info-section {
    margin-bottom: 16px;
}

.info-popup-content a {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.info-popup-content a:hover {
    color: #764ba2;
    text-decoration: underline;
}

/* Mobile Warning Popup */
.mobile-warning-popup {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 3000;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(4px);
}

.mobile-warning-popup.active {
    display: flex;
}

.mobile-warning-content {
    background: white;
    border-radius: 20px;
    padding: 40px;
    max-width: 400px;
    width: 85%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    position: relative;
    animation: slideIn 0.3s ease;
    text-align: center;
}

.mobile-warning-icon {
    width: 80px;
    height: 80px;
    background: #f59e0b;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    position: relative;
    font-size: 48px;
    font-weight: bold;
    color: white;
}

.mobile-warning-content h2 {
    color: #f59e0b;
    font-size: 1.8em;
    margin-bottom: 16px;
    font-weight: 700;
}

.mobile-warning-content p {
    color: #4a5568;
    line-height: 1.6;
    margin-bottom: 12px;
    font-size: 1em;
}

.mobile-warning-content p:last-of-type {
    margin-bottom: 24px;
}

.mobile-warning-content a {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
}

.mobile-warning-content a:hover {
    text-decoration: underline;
}

.mobile-warning-close {
    background: #f59e0b;
    color: white;
    border: none;
    border-radius: 12px;
    padding: 12px 32px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.mobile-warning-close:hover {
    background: #d97706;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(245, 158, 11, 0.4);
}

@media (max-width: 768px) {
    .mobile-warning-content {
        padding: 32px 24px;
    }

    .mobile-warning-content h2 {
        font-size: 1.5em;
    }
}

/* No JavaScript Warning (Red X) */
.noscript-warning {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(4px);
}

.noscript-warning-content {
    background: white;
    border-radius: 20px;
    padding: 40px;
    max-width: 400px;
    width: 85%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    position: relative;
    text-align: center;
}

.noscript-warning-icon {
    width: 80px;
    height: 80px;
    background: #ef4444;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    position: relative;
}

.noscript-warning-icon::before,
.noscript-warning-icon::after {
    content: '';
    position: absolute;
    background: white;
    border-radius: 4px;
}

.noscript-warning-icon::before {
    width: 6px;
    height: 40px;
    transform: rotate(45deg);
}

.noscript-warning-icon::after {
    width: 6px;
    height: 40px;
    transform: rotate(-45deg);
}

.noscript-warning-content h2 {
    color: #ef4444;
    font-size: 1.8em;
    margin-bottom: 16px;
    font-weight: 700;
}

.noscript-warning-content p {
    color: #4a5568;
    line-height: 1.6;
    margin-bottom: 12px;
    font-size: 1em;
}

.noscript-warning-content p:last-of-type {
    margin-bottom: 0;
}

@media (max-width: 768px) {
    .noscript-warning-content {
        padding: 32px 24px;
    }

    .noscript-warning-content h2 {
        font-size: 1.5em;
    }
}

/* WASM Loading Overlay */
.wasm-loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.wasm-loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.wasm-loading-content {
    background: white;
    border-radius: 24px;
    padding: 48px 64px;
    text-align: center;
    max-width: 500px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.wasm-spinner {
    width: 60px;
    height: 60px;
    margin: 0 auto 24px;
    border: 4px solid rgba(102, 126, 234, 0.2);
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.wasm-loading-content h2 {
    color: #2d3748;
    font-size: 1.8em;
    margin-bottom: 12px;
    font-weight: 700;
}

.wasm-loading-content p {
    color: #718096;
    font-size: 1em;
    margin-bottom: 24px;
}

.wasm-progress-bar {
    width: 100%;
    height: 8px;
    background: rgba(102, 126, 234, 0.2);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.wasm-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0%;
}

@media (max-width: 768px) {
    .wasm-loading-content {
        padding: 40px 32px;
        margin: 20px;
    }

    .wasm-loading-content h2 {
        font-size: 1.5em;
    }

    .wasm-spinner {
        width: 50px;
        height: 50px;
    }
}

/* Footer */
footer {
    text-align: center;
    color: #718096;
    font-size: 0.9em;
    margin-top: 40px;
    padding-top: 24px;
    border-top: 2px solid rgba(0, 0, 0, 0.1);
}

footer a {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

footer a:hover {
    color: #764ba2;
    text-decoration: underline;
}

.container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 24px;
    padding: 48px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 600px;
    width: 100%;
    backdrop-filter: blur(10px);
}

/* Desktop only - 2x width expansion */
@media (min-width: 769px) {
    .container {
        max-width: 1200px;
    }
}

h1 {
    color: #2d3748;
    font-size: 2.5em;
    margin-bottom: 12px;
    text-align: center;
    font-weight: 700;
}

.subtitle {
    color: #718096;
    text-align: center;
    margin-bottom: 40px;
    font-size: 1.1em;
}

.control-group {
    margin-bottom: 32px;
}

label {
    display: block;
    color: #4a5568;
    font-weight: 600;
    margin-bottom: 12px;
    font-size: 0.95em;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.instrument-selector {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 16px;
}

.instrument-btn {
    padding: 12px 16px;
    background: #f7fafc;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    color: #4a5568;
    text-align: center;
    font-size: 0.9em;
}

.instrument-btn:hover {
    border-color: #667eea;
    background: #f0f4ff;
}

.instrument-btn.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-color: #667eea;
}

.tempo-control {
    display: flex;
    align-items: center;
    gap: 16px;
}

input[type="range"] {
    flex: 1;
    height: 8px;
    border-radius: 4px;
    background: linear-gradient(to right, #667eea, #764ba2);
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: white;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    border: 3px solid #667eea;
}

input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: white;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    border: 3px solid #667eea;
}

.tempo-value {
    font-size: 1.2em;
    font-weight: 700;
    color: #667eea;
    min-width: 80px;
    text-align: right;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 16px;
}

.checkbox-group input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: #667eea;
}

.checkbox-group label {
    margin: 0;
    text-transform: none;
    letter-spacing: normal;
    font-size: 1em;
    cursor: pointer;
    color: #4a5568;
    font-weight: 500;
}

.help-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    font-size: 12px;
    font-weight: bold;
    cursor: help;
    margin-left: 6px;
    position: relative;
    transition: all 0.3s ease;
}

.help-icon:hover {
    transform: scale(1.1);
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.4);
}

.tooltip {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    background: rgba(45, 55, 72, 0.98);
    color: white;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 0.82em;
    white-space: normal;
    width: 360px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
    pointer-events: none;
    line-height: 1.5;
    font-weight: 400;
}

.tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: rgba(45, 55, 72, 0.98);
}

.help-icon:hover .tooltip,
.help-icon:focus .tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-12px);
}

.tooltip strong {
    color: #a78bfa;
    display: block;
    margin-bottom: 6px;
}

button {
    width: 100%;
    padding: 18px 36px;
    font-size: 1.2em;
    font-weight: 700;
    color: white;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin: 32px 0;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

button:active {
    transform: translateY(0);
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.visualizer {
    height: 300px;
    background: #0a0e27;
    border-radius: 12px;
    margin: 32px 0;
    padding: 0;
    position: relative;
    overflow: hidden;
    border: 2px solid #667eea;
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
}

#neural-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.visualization-info {
    position: absolute;
    top: 12px;
    right: 16px;
    background: rgba(10, 14, 39, 0.85);
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 0.75em;
    color: rgba(255, 255, 255, 0.9);
    font-family: 'Courier New', monospace;
    line-height: 1.6;
    pointer-events: none;
    z-index: 10;
    border: 1px solid rgba(102, 126, 234, 0.3);
}

.info-row {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 4px;
}

.info-row:last-child {
    margin-bottom: 0;
}

.info-label {
    color: rgba(167, 139, 250, 0.9);
    font-weight: 600;
}

.info-value {
    color: rgba(255, 255, 255, 0.95);
    font-weight: 500;
}

.visualization-label {
    position: absolute;
    top: 12px;
    left: 16px;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.85em;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    pointer-events: none;
    z-index: 10;
}

.transformer-stats {
    background: rgba(10, 14, 39, 0.85);
    border-radius: 12px;
    padding: 20px 24px;
    margin: 32px 0;
    border: 2px solid rgba(102, 126, 234, 0.3);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.stats-title {
    color: rgba(167, 139, 250, 0.95);
    font-size: 0.9em;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
    text-align: center;
    border-bottom: 1px solid rgba(102, 126, 234, 0.3);
    padding-bottom: 8px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    font-size: 0.85em;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 6px;
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.stat-label {
    color: rgba(167, 139, 250, 0.9);
    font-weight: 600;
    font-family: 'Courier New', monospace;
}

.stat-value {
    color: rgba(255, 255, 255, 0.95);
    font-weight: 600;
    font-family: 'Courier New', monospace;
}

.time-scrubber {
    margin-top: 24px;
    display: none;
    background: rgba(255, 255, 255, 0.95);
    padding: 28px;
    border-radius: 16px;
    border: 2px solid rgba(102, 126, 234, 0.2);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.time-scrubber.visible {
    display: block;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Waveform Visualization */
.waveform-container {
    width: 100%;
    height: 120px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    border-radius: 12px;
    margin-bottom: 20px;
    position: relative;
    overflow: hidden;
    border: 2px solid rgba(102, 126, 234, 0.15);
}

#waveform-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.waveform-label {
    color: rgba(102, 126, 234, 0.9);
    font-size: 0.75em;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
    text-align: left;
}

.player-controls {
    display: flex;
    gap: 16px;
    align-items: center;
    margin-top: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

@media (max-width: 768px) {
    .time-scrubber {
        padding: 20px 16px;
    }

    .player-controls {
        gap: 12px;
    }
}

.play-pause-btn {
    width: 56px;
    height: 56px;
    border-radius: 8px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
    flex-shrink: 0;
    position: relative;
    margin: 0;
    padding: 0;
}

.play-pause-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 8px;
    padding: 2px;
    background: linear-gradient(135deg, rgba(255,255,255,0.3), rgba(255,255,255,0));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
    pointer-events: none;
}

.play-pause-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.play-pause-btn:active {
    transform: translateY(0);
}

.play-pause-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

#play-pause-icon {
    font-size: 24px;
    color: white;
    line-height: 1;
    display: block;
    filter: drop-shadow(0 1px 2px rgba(0,0,0,0.3));
}

.time-info {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.export-btn {
    padding: 14px 28px;
    background: linear-gradient(135deg, #48bb78 0%, #38a169 100%);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95em;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(72, 187, 120, 0.3);
    white-space: nowrap;
    margin: 0;
    height: 56px;
}

.export-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(72, 187, 120, 0.5);
}

.export-btn:active {
    transform: translateY(0);
}

.export-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.time-info {
    flex: 1;
    min-width: 120px;
    display: flex;
    justify-content: center;
}

.scrubber-track {
    position: relative;
    height: 12px;
    background: rgba(102, 126, 234, 0.15);
    border-radius: 6px;
    cursor: pointer;
    margin-bottom: 20px;
    overflow: visible;
    border: 1px solid rgba(102, 126, 234, 0.2);
    touch-action: none;
    -webkit-user-select: none;
    user-select: none;
}

.scrubber-progress {
    position: absolute;
    height: 100%;
    background: linear-gradient(to right, #667eea, #764ba2);
    border-radius: 6px;
    width: 0%;
    transition: width 0.1s linear;
    pointer-events: none;
}

.scrubber-handle {
    position: absolute;
    width: 24px;
    height: 24px;
    background: white;
    border: 3px solid #667eea;
    border-radius: 50%;
    top: 50%;
    left: 0%;
    transform: translate(-50%, -50%);
    cursor: grab;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.3);
    transition: all 0.2s ease;
    z-index: 10;
    touch-action: none;
    -webkit-user-select: none;
    user-select: none;
}

.scrubber-handle:hover {
    transform: translate(-50%, -50%) scale(1.3);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.6);
}

.scrubber-handle:active {
    cursor: grabbing;
    transform: translate(-50%, -50%) scale(1.2);
}

/* Better mobile touch targets */
@media (max-width: 768px) {
    .scrubber-track {
        height: 16px;
        margin-bottom: 24px;
    }

    .scrubber-handle {
        width: 32px;
        height: 32px;
        border-width: 4px;
    }
}

.scrubber-time {
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 0.95em;
    font-weight: 600;
    min-width: 140px;
    background: rgba(255, 255, 255, 0.8);
    padding: 10px 20px;
    border-radius: 8px;
    border: 1px solid rgba(102, 126, 234, 0.3);
    white-space: nowrap;
}

.time-display {
    color: #2d3748;
    font-family: 'Courier New', monospace;
    font-size: 1.1em;
    font-weight: 700;
}

.time-separator {
    color: #718096;
    margin: 0 8px;
    font-weight: 600;
}

.status {
    text-align: center;
    color: #718096;
    font-size: 0.95em;
    margin-top: 20px;
    min-height: 24px;
    font-weight: 500;
}

.status.generating {
    color: #667eea;
    font-weight: 600;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.generating {
    animation: pulse 1.5s ease-in-out infinite;
}

.explanation-section {
    margin-top: 48px;
    padding-top: 32px;
    border-top: 2px solid #e2e8f0;
}

.explanation-section h2 {
    color: #2d3748;
    font-size: 1.8em;
    margin-bottom: 20px;
    text-align: center;
}

.diagram {
    background: white;
    border-radius: 12px;
    padding: 24px;
    margin: 24px 0;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.diagram img {
    width: 100%;
    height: auto;
    border-radius: 8px;
}

.explanation-text {
    color: #4a5568;
    line-height: 1.8;
    font-size: 1em;
}

.explanation-text h3 {
    color: #2d3748;
    font-size: 1.3em;
    margin: 24px 0 12px 0;
}

.explanation-text p {
    margin-bottom: 16px;
}

.explanation-text strong {
    color: #667eea;
    font-weight: 600;
}

.explanation-text ul {
    margin-left: 24px;
    margin-bottom: 16px;
}

.explanation-text li {
    margin-bottom: 8px;
}

/* Additional Mobile Responsiveness */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    .container {
        padding: 24px;
        border-radius: 16px;
        max-width: 100%;
    }

    h1 {
        font-size: 1.8em;
        margin-bottom: 8px;
    }

    .subtitle {
        font-size: 0.95em;
        margin-bottom: 24px;
    }

    .control-group {
        margin-bottom: 24px;
    }

    label {
        font-size: 0.85em;
        margin-bottom: 10px;
    }

    .instrument-selector {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .instrument-btn {
        padding: 10px 12px;
        font-size: 0.85em;
    }

    .tempo-value {
        font-size: 1em;
        min-width: 60px;
    }

    button {
        padding: 14px 28px;
        font-size: 1em;
        margin: 24px 0;
    }

    .visualizer {
        height: 200px;
        margin: 24px 0;
    }

    .visualization-info {
        font-size: 0.65em;
        padding: 8px 12px;
        top: 8px;
        right: 8px;
    }

    .visualization-label {
        font-size: 0.75em;
        top: 8px;
        left: 12px;
    }

    .transformer-stats {
        padding: 16px;
        margin-top: 24px;
    }

    /* Make stats list single-column and tighten spacing on mobile */
    .stats-grid {
        grid-template-columns: 1fr;
    }
    .stat-item {
        padding: 10px 12px;
    }
    .stat-label, .stat-value {
        font-size: 0.95em;
    }

    .stat-row {
        font-size: 0.85em;
    }

    .playback-controls {
        margin-top: 24px;
    }

    .time-display {
        font-size: 0.85em;
    }

    .scrubber-bar {
        height: 6px;
    }

    .scrubber-handle {
        width: 18px;
        height: 18px;
    }

    .info-popup-content {
        padding: 30px 20px;
        width: 95%;
        max-height: 90vh;
    }

    .info-popup-content h2 {
        font-size: 1.5em;
    }

    .info-popup-content h3 {
        font-size: 1em;
    }

    .info-popup-content p {
        font-size: 0.9em;
    }

    .tooltip {
        width: 280px;
        font-size: 0.75em;
        padding: 10px 12px;
    }

    .help-icon {
        width: 16px;
        height: 16px;
        font-size: 11px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 16px;
    }

    h1 {
        font-size: 1.5em;
    }

    .subtitle {
        font-size: 0.9em;
    }

    .instrument-selector {
        grid-template-columns: 1fr;
    }

    .tempo-control {
        flex-direction: column;
        align-items: stretch;
    }

    .tempo-value {
        text-align: center;
        margin-top: 8px;
    }

    .visualizer {
        height: 150px;
    }

    .visualization-info {
        display: none; /* Hide on very small screens to save space */
    }

    .tooltip {
        width: 220px;
        font-size: 0.7em;
    }

    /* Stack label above value for very small screens to avoid right shift */
    .stats-grid { grid-template-columns: 1fr; }
    .stat-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }
    .stat-value { width: 100%; text-align: left; }
}

/* Math Formula Styling */
.math-formula-box {
    background: linear-gradient(135deg, #f7fafc 0%, #e6f2ff 100%);
    border-left: 4px solid var(--color-primary);
    padding: 24px;
    border-radius: 12px;
    margin: 20px 0;
    overflow-x: auto;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.math-formula-box:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
}

.math-formula-box.secondary {
    background: linear-gradient(135deg, #f0e6ff 0%, #e6d9ff 100%);
    border-left-color: var(--color-secondary);
}

.math-formula-box p {
    margin: 0;
    color: #2d3748;
}

.math-formula-box .katex {
    font-size: 1.2em;
}

.math-formula-box .katex-display {
    margin: 12px 0;
}

/* Inline math styling */
.explanation-text .katex,
ul li .katex {
    color: var(--color-secondary);
    font-size: 1.05em;
}

/* Responsive math on mobile */
@media (max-width: 768px) {
    .math-formula-box {
        padding: 16px;
        margin: 16px 0;
    }
    
    .math-formula-box .katex {
        font-size: 1em;
    }
}