@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;700&family=Space+Grotesk:wght@300;400;500;700&display=swap');
        
        :root {
            --bg: #0a0a0f;
            --panel: #12121a;
            --panel-elevated: #1a1a24;
            --accent: #00e5cc;
            --accent-secondary: #7b61ff;
            --accent-glow: rgba(0, 229, 204, 0.25);
            --accent-glow-strong: rgba(0, 229, 204, 0.5);
            --text: #e8e8ed;
            --text-dim: #6b6b7b;
            --border: #2a2a3a;
            --danger: #ff6b6b;
            --warning: #ffb86c;
        }
        
        * { box-sizing: border-box; }
        
        /* SEO content - visible to crawlers, hidden visually */
        .seo-header {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }
        
        body {
            font-family: 'Space Grotesk', system-ui, sans-serif;
            background: var(--bg);
            color: var(--text);
            min-height: 100vh;
            margin: 0;
            padding: 20px;
            background-image: 
                radial-gradient(ellipse at 20% 0%, rgba(0, 229, 204, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 100%, rgba(123, 97, 255, 0.06) 0%, transparent 50%);
        }
        
        .app-container {
            max-width: 1200px;
            margin: 0 auto;
        }
        
        .container {
            background: var(--panel);
            border: 1px solid var(--border);
            border-radius: 20px;
            box-shadow: 
                0 25px 80px rgba(0, 0, 0, 0.5),
                0 0 0 1px rgba(255, 255, 255, 0.03) inset;
            overflow: hidden;
        }
        
        /* HEADER */
        .header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1.5rem 2rem;
            border-bottom: 1px solid var(--border);
            background: linear-gradient(180deg, rgba(255,255,255,0.02) 0%, transparent 100%);
        }
        
        .header-left h1 {
            margin: 0;
            font-weight: 500;
            font-size: 1.4rem;
            letter-spacing: -0.5px;
        }

        .header-left h1 a {
            text-decoration: none;
            background: linear-gradient(135deg, var(--text) 0%, var(--text-dim) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .header-left h1 a:hover {
            background: linear-gradient(135deg, var(--accent) 0%, var(--text) 100%);
            -webkit-background-clip: text;
            background-clip: text;
        }

        .header-left .subtitle {
            margin: 2px 0 0 0;
            font-size: 0.75rem;
            color: var(--text-dim);
            font-weight: 400;
        }
        
        .header-left .status {
            font-family: 'JetBrains Mono', monospace;
            color: var(--accent);
            font-size: 0.75rem;
            margin-top: 4px;
            letter-spacing: 0.5px;
            min-height: 1.2em;
        }
        
        .header-controls {
            display: flex;
            gap: 12px;
            align-items: center;
        }
        
        #powerBtn {
            background: var(--panel-elevated);
            color: var(--text-dim);
            border: 1px solid var(--border);
            padding: 0.7rem 1.8rem;
            font-size: 0.9rem;
            font-weight: 500;
            font-family: inherit;
            border-radius: 50px;
            cursor: pointer;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        #powerBtn:hover {
            background: #252532;
            color: var(--text);
            border-color: #3a3a4a;
        }
        
        #powerBtn:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }
        
        #powerBtn.playing {
            background: rgba(0, 229, 204, 0.1);
            color: var(--accent);
            border-color: var(--accent);
            box-shadow: 0 0 30px var(--accent-glow);
        }
        
        #powerBtn.fading {
            background: rgba(255, 184, 108, 0.1);
            color: var(--warning);
            border-color: var(--warning);
        }
        
        .kbd-hint {
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.65rem;
            color: var(--text-dim);
            background: var(--bg);
            padding: 2px 6px;
            border-radius: 4px;
            border: 1px solid var(--border);
        }
        
        /* MAIN LAYOUT */
        .main-content {
            display: grid;
            grid-template-columns: 1fr 360px;
            min-height: 520px;
        }
        
        /* LEFT PANEL - VISUALIZER & PRESETS */
        .left-panel {
            padding: 1.5rem 2rem;
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
            border-right: 1px solid var(--border);
        }
        
        /* VISUALIZER */
        .visualizer-container {
            background: var(--bg);
            border-radius: 12px;
            border: 1px solid var(--border);
            padding: 1rem;
            position: relative;
            overflow: hidden;
        }
        
        .visualizer-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 0.75rem;
        }
        
        .visualizer-header span {
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.65rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--text-dim);
        }
        
        .viz-toggle {
            display: flex;
            gap: 4px;
        }
        
        .viz-toggle button {
            background: transparent;
            border: 1px solid var(--border);
            color: var(--text-dim);
            padding: 4px 10px;
            font-size: 0.7rem;
            font-family: 'JetBrains Mono', monospace;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.15s;
        }
        
        .viz-toggle button:hover {
            border-color: var(--text-dim);
        }
        
        .viz-toggle button.active {
            background: var(--accent);
            border-color: var(--accent);
            color: var(--bg);
        }
        
        #visualizer {
            width: 100%;
            height: 80px;
            display: block;
        }
        
        /* PRESETS */
        .presets-section {
            flex: 1;
            display: flex;
            flex-direction: column;
            min-height: 0;
        }
        
        .section-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 0.75rem;
        }
        
        .section-header h3 {
            margin: 0;
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: var(--text-dim);
            font-weight: 500;
        }
        
        .preset-filter {
            display: flex;
            gap: 4px;
        }
        
        .preset-filter button {
            background: transparent;
            border: 1px solid var(--border);
            color: var(--text-dim);
            padding: 3px 8px;
            font-size: 0.65rem;
            font-family: 'JetBrains Mono', monospace;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.15s;
        }
        
        .preset-filter button:hover {
            border-color: var(--text-dim);
        }
        
        .preset-filter button.active {
            background: var(--accent-secondary);
            border-color: var(--accent-secondary);
            color: white;
        }
        
        .category-legend {
            display: flex;
            flex-wrap: wrap;
            gap: 10px 16px;
            margin-bottom: 0.75rem;
            padding: 8px 0;
        }
        
        .legend-item {
            display: flex;
            align-items: center;
            gap: 5px;
            font-size: 0.65rem;
            font-family: 'JetBrains Mono', monospace;
            color: var(--text-dim);
        }
        
        .legend-color {
            width: 12px;
            height: 12px;
            border-radius: 3px;
        }
        
        .preset-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(125px, 1fr));
            gap: 8px;
            overflow-y: auto;
            flex: 1;
            padding-right: 8px;
            align-content: start;
        }
        
        .preset-grid::-webkit-scrollbar {
            width: 4px;
        }
        
        .preset-grid::-webkit-scrollbar-track {
            background: var(--bg);
            border-radius: 2px;
        }
        
        .preset-grid::-webkit-scrollbar-thumb {
            background: var(--border);
            border-radius: 2px;
        }
        
        .preset-btn {
            background: var(--panel-elevated);
            border: 1px solid var(--border);
            color: var(--text);
            padding: 8px 10px;
            border-radius: 8px;
            cursor: pointer;
            font-size: 0.75rem;
            font-family: inherit;
            text-align: left;
            transition: all 0.15s ease;
            position: relative;
            display: flex;
            flex-direction: column;
            gap: 2px;
        }
        
        .preset-btn:hover {
            background: #252532;
            border-color: #3a3a4a;
            transform: translateY(-1px);
        }
        
        .preset-btn:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }
        
        .preset-btn.active {
            background: var(--accent);
            color: var(--bg);
            border-color: var(--accent);
            font-weight: 600;
        }
        
        .preset-btn .preset-name {
            font-weight: 500;
        }
        
        .preset-btn .preset-meta {
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.6rem;
            opacity: 0.6;
        }
        
        .preset-btn.active .preset-meta {
            opacity: 0.8;
        }
        
        .preset-btn.custom {
            border-style: dashed;
            border-color: var(--accent-secondary);
        }
        
        .preset-btn.custom.active {
            background: var(--accent-secondary);
            border-style: solid;
            color: white;
        }
        
        .delete-preset {
            position: absolute;
            top: 4px;
            right: 4px;
            background: var(--danger);
            border: none;
            color: white;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            font-size: 10px;
            cursor: pointer;
            opacity: 0;
            transition: opacity 0.15s;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .preset-btn.custom:hover .delete-preset {
            opacity: 1;
        }
        
        /* Category colors */
        .preset-btn[data-category="sleep"] { border-left: 3px solid #8b5cf6; }
        .preset-btn[data-category="focus"] { border-left: 3px solid #3b82f6; }
        .preset-btn[data-category="ambient"] { border-left: 3px solid #10b981; }
        .preset-btn[data-category="nature"] { border-left: 3px solid #22c55e; }
        .preset-btn[data-category="mechanical"] { border-left: 3px solid #f59e0b; }
        .preset-btn[data-category="experimental"] { border-left: 3px solid #ef4444; }
        .preset-btn[data-category="textured"] { border-left: 3px solid #ec4899; }
        
        /* RIGHT PANEL */
        .right-panel {
            padding: 1.5rem;
            display: flex;
            flex-direction: column;
            gap: 1rem;
            background: rgba(0,0,0,0.2);
            overflow-y: auto;
        }
        
        .control-panel {
            background: var(--panel-elevated);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 1rem 1.25rem;
        }
        
        .panel-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1rem;
            padding-bottom: 0.75rem;
            border-bottom: 1px solid var(--border);
        }
        
        .panel-header span {
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.65rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--text-dim);
        }
        
        .reset-btn {
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.65rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            background: transparent;
            border: 1px solid var(--border);
            color: var(--text-dim);
            padding: 4px 10px;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.15s;
        }
        
        .reset-btn:hover {
            border-color: var(--text-dim);
            color: var(--text);
        }
        
        /* CONTROLS */
        .control-group {
            margin-bottom: 1rem;
        }
        
        .control-group:last-child {
            margin-bottom: 0;
        }
        
        .control-group label {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 6px;
            font-size: 0.8rem;
            color: var(--text);
        }
        
        .control-group label span {
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.7rem;
            color: var(--accent);
        }
        
        .slider-labels {
            display: flex;
            justify-content: space-between;
            font-size: 0.6rem;
            color: var(--text-dim);
            margin-top: 3px;
            font-family: 'JetBrains Mono', monospace;
        }
        
        input[type="range"] {
            width: 100%;
            height: 6px;
            -webkit-appearance: none;
            appearance: none;
            background: var(--bg);
            border-radius: 3px;
            cursor: pointer;
            border: 1px solid var(--border);
        }
        
        input[type="range"]::-webkit-slider-thumb {
            -webkit-appearance: none;
            width: 14px;
            height: 14px;
            background: var(--accent);
            border-radius: 50%;
            cursor: pointer;
            box-shadow: 0 0 10px var(--accent-glow);
            transition: transform 0.1s;
        }
        
        input[type="range"]::-webkit-slider-thumb:hover {
            transform: scale(1.1);
        }
        
        input[type="range"]::-moz-range-thumb {
            width: 14px;
            height: 14px;
            background: var(--accent);
            border-radius: 50%;
            cursor: pointer;
            border: none;
            box-shadow: 0 0 10px var(--accent-glow);
        }
        
        select {
            width: 100%;
            padding: 8px 10px;
            background: var(--bg);
            color: var(--text);
            border: 1px solid var(--border);
            border-radius: 6px;
            font-family: inherit;
            font-size: 0.8rem;
            cursor: pointer;
        }
        
        select:focus {
            outline: none;
            border-color: var(--accent);
        }
        
        /* TOGGLE SWITCH */
        .toggle-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 6px 0;
        }
        
        .toggle-row span {
            font-size: 0.8rem;
        }
        
        .switch {
            position: relative;
            display: inline-block;
            width: 40px;
            height: 22px;
        }
        
        .switch input {
            opacity: 0;
            width: 0;
            height: 0;
        }
        
        .slider-toggle {
            position: absolute;
            cursor: pointer;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-color: var(--bg);
            border: 1px solid var(--border);
            transition: 0.3s;
            border-radius: 22px;
        }
        
        .slider-toggle:before {
            position: absolute;
            content: "";
            height: 14px;
            width: 14px;
            left: 3px;
            bottom: 3px;
            background-color: var(--text-dim);
            transition: 0.3s;
            border-radius: 50%;
        }
        
        input:checked + .slider-toggle {
            background-color: var(--accent);
            border-color: var(--accent);
        }
        
        input:checked + .slider-toggle:before {
            transform: translateX(18px);
            background-color: var(--bg);
        }
        
        input:focus-visible + .slider-toggle {
            box-shadow: 0 0 0 2px var(--accent-glow);
        }
        
        /* FADE CONTROLS */
        .fade-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
        }
        
        .fade-row .control-group {
            margin-bottom: 0;
        }
        
        .adsr-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
            margin-bottom: 12px;
        }
        
        .adsr-row .control-group {
            margin-bottom: 0;
        }
        
        #durationGroup {
            margin-bottom: 0;
        }
        
        .loop-switch {
            margin-left: auto;
            margin-right: 8px;
        }
        
        .loop-label {
            font-size: 0.75rem;
            color: var(--text-dim);
        }
        
        .panel-header {
            display: flex;
            align-items: center;
        }
        
        .panel-subheader {
            display: flex;
            align-items: center;
            font-size: 0.8rem;
            font-weight: 500;
            color: var(--text-dim);
            margin: 1rem 0 0.5rem 0;
            padding-top: 0.75rem;
            border-top: 1px solid var(--border);
        }
        
        .panel-subheader .loop-switch {
            margin-left: auto;
            margin-right: 8px;
        }
        
        .panel-subheader .loop-label {
            font-size: 0.7rem;
        }
        
        /* Voice Tabs */
        .voice-panel {
            padding: 0;
        }
        
        .voice-tabs {
            display: flex;
            border-bottom: 1px solid var(--border);
        }
        
        .voice-tab {
            flex: 1;
            padding: 0.75rem 0.5rem;
            background: transparent;
            border: none;
            color: var(--text-dim);
            font-size: 0.8rem;
            cursor: pointer;
            transition: all 0.2s;
            border-bottom: 2px solid transparent;
        }
        
        .voice-tab:hover {
            color: var(--text);
            background: rgba(255, 255, 255, 0.03);
        }
        
        .voice-tab.active {
            color: var(--accent);
            border-bottom-color: var(--accent);
        }
        
        .voice-tab.disabled {
            color: var(--text-dim);
            opacity: 0.5;
        }
        
        .voice-tab.enabled {
            color: var(--text);
        }
        
        .voice-content {
            padding: 1rem;
        }
        
        .voice-enable-row {
            margin-bottom: 1rem;
            padding-bottom: 0.75rem;
            border-bottom: 1px solid var(--border);
        }
        
        /* Advanced panel */
        .advanced-panel {
            cursor: pointer;
        }
        
        .advanced-panel summary {
            list-style: none;
            user-select: none;
        }
        
        .advanced-panel summary::-webkit-details-marker {
            display: none;
        }
        
        .advanced-panel summary::after {
            content: '▶';
            font-size: 0.6rem;
            margin-left: auto;
            transition: transform 0.2s;
        }
        
        .advanced-panel[open] summary::after {
            transform: rotate(90deg);
        }
        
        .advanced-content {
            padding-top: 1rem;
        }
        
        .advanced-section-label {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            color: var(--text-dim);
            margin-bottom: 0.5rem;
            margin-top: 1rem;
        }
        
        .advanced-section-label:first-child {
            margin-top: 0;
        }
        
        /* Footer */
        .site-footer {
            margin-top: 3rem;
            padding: 2rem 1.5rem 3rem;
            display: flex;
            justify-content: center;
        }

        .footer-container {
            width: 100%;
            max-width: 800px;
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .footer-container .tagline {
            text-align: center;
            color: var(--text-dim);
            font-size: 0.85rem;
            margin: 0 0 1.5rem 0;
        }

        .tech-nav {
            display: flex;
            gap: 1.5rem;
            align-items: center;
            margin-bottom: 2rem;
        }

        .tech-nav .nav-item {
            color: var(--accent);
            text-decoration: none;
            font-size: 0.9rem;
            font-weight: 500;
            transition: color 0.15s;
        }

        .tech-nav .nav-item:hover {
            color: var(--text);
            text-decoration: underline;
        }

        .tech-nav .nav-divider {
            width: 1px;
            height: 16px;
            background: var(--border);
        }

        .faq-nav {
            width: 100%;
        }

        .faq-section {
            background: var(--panel-elevated);
            border: 1px solid var(--border);
            border-radius: 8px;
            margin-bottom: 8px;
        }
        
        .faq-section summary {
            padding: 12px 16px;
            cursor: pointer;
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--text);
            list-style: none;
        }
        
        .faq-section summary::-webkit-details-marker {
            display: none;
        }
        
        .faq-section summary::before {
            content: "+ ";
            color: var(--accent);
            font-weight: bold;
            margin-right: 8px;
        }
        
        .faq-section[open] summary::before {
            content: "− ";
        }
        
        .faq-section p {
            padding: 0 16px 12px 28px;
            margin: 0;
            font-size: 0.8rem;
            color: var(--text-dim);
            line-height: 1.6;
        }
        
        .faq-section strong {
            color: var(--text);
        }
        
        /* TIMER */
        .timer-panel {
            background: var(--panel-elevated);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 1rem 1.25rem;
        }
        
        .timer-display {
            font-family: 'JetBrains Mono', monospace;
            font-size: 1.4rem;
            text-align: center;
            color: var(--text);
            margin: 0.5rem 0;
            letter-spacing: 2px;
        }
        
        .timer-display.active {
            color: var(--accent);
            text-shadow: 0 0 20px var(--accent-glow);
        }
        
        .timer-display.fading {
            color: var(--warning);
            text-shadow: 0 0 20px rgba(255, 184, 108, 0.4);
        }
        
        .timer-presets {
            display: flex;
            gap: 4px;
            flex-wrap: wrap;
            justify-content: center;
            margin-bottom: 0.5rem;
        }
        
        .timer-preset-btn {
            background: var(--bg);
            border: 1px solid var(--border);
            color: var(--text-dim);
            padding: 5px 10px;
            font-size: 0.7rem;
            font-family: 'JetBrains Mono', monospace;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.15s;
        }
        
        .timer-preset-btn:hover {
            border-color: var(--text-dim);
            color: var(--text);
        }
        
        .timer-preset-btn.active {
            background: var(--accent);
            border-color: var(--accent);
            color: var(--bg);
        }
        
        .timer-controls {
            display: flex;
            gap: 8px;
            justify-content: center;
        }
        
        .timer-btn {
            background: transparent;
            border: 1px solid var(--border);
            color: var(--text-dim);
            padding: 5px 14px;
            font-size: 0.7rem;
            font-family: inherit;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.15s;
        }
        
        .timer-btn:hover {
            border-color: var(--text-dim);
            color: var(--text);
        }
        
        .timer-btn.cancel {
            border-color: var(--danger);
            color: var(--danger);
        }
        
        /* SAVE PRESET */
        .save-preset-section {
            display: flex;
            gap: 8px;
        }
        
        .save-preset-section input {
            flex: 1;
            background: var(--bg);
            border: 1px solid var(--border);
            color: var(--text);
            padding: 8px 10px;
            border-radius: 6px;
            font-family: inherit;
            font-size: 0.8rem;
        }
        
        .save-preset-section input:focus {
            outline: none;
            border-color: var(--accent);
        }
        
        .save-preset-section input::placeholder {
            color: var(--text-dim);
        }
        
        .save-btn {
            background: var(--accent-secondary);
            border: none;
            color: white;
            padding: 8px 14px;
            font-size: 0.75rem;
            font-family: inherit;
            font-weight: 500;
            border-radius: 6px;
            cursor: pointer;
            transition: all 0.15s;
            white-space: nowrap;
        }
        
        .save-btn:hover {
            filter: brightness(1.1);
        }
        
        /* Export section */
        .export-section {
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }
        
        .export-btn {
            background: var(--accent-secondary);
            border: none;
            color: white;
            padding: 10px 14px;
            font-size: 0.8rem;
            font-family: inherit;
            font-weight: 500;
            border-radius: 6px;
            cursor: pointer;
            transition: all 0.15s;
        }
        
        .export-btn:hover:not(:disabled) {
            filter: brightness(1.1);
        }
        
        .export-btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
        }
        
        .export-btn.recording {
            background: #ef4444;
            animation: pulse-recording 1s ease-in-out infinite;
        }
        
        @keyframes pulse-recording {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.7; }
        }
        
        .export-progress {
            margin-top: 0.25rem;
        }
        
        .export-progress-bar {
            height: 4px;
            background: var(--border);
            border-radius: 2px;
            overflow: hidden;
            margin-bottom: 0.25rem;
        }
        
        .export-progress-bar::after {
            content: '';
            display: block;
            height: 100%;
            width: var(--progress, 0%);
            background: var(--accent);
            transition: width 0.3s;
        }
        
        .export-progress-text {
            font-size: 0.7rem;
            color: var(--text-dim);
        }
        
        /* Composition Editor */
        .composition-panel summary {
            cursor: pointer;
        }
        
        .composition-content {
            padding: 1rem;
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }
        
        .composition-buttons {
            display: flex;
            gap: 0.5rem;
            flex-wrap: wrap;
        }
        
        .file-upload-btn {
            background: var(--accent-secondary);
            border: none;
            color: white;
            padding: 6px 12px;
            font-size: 0.75rem;
            font-family: inherit;
            font-weight: 500;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.15s;
        }
        
        .file-upload-btn:hover {
            filter: brightness(1.1);
        }
        
        .comp-btn {
            background: var(--bg);
            border: 1px solid var(--border);
            color: var(--text);
            padding: 6px 12px;
            font-size: 0.75rem;
            font-family: inherit;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.15s;
        }
        
        .comp-btn:hover {
            border-color: var(--accent);
        }
        
        #compositionEditor {
            width: 100%;
            height: 200px;
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: 6px;
            color: var(--text);
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.7rem;
            padding: 0.75rem;
            resize: vertical;
        }
        
        #compositionEditor:focus {
            outline: none;
            border-color: var(--accent);
        }
        
        .composition-status {
            font-size: 0.75rem;
            min-height: 1.5em;
        }
        
        .composition-status.valid {
            color: #22c55e;
        }
        
        .composition-status.invalid {
            color: #ef4444;
        }
        
        .composition-actions {
            display: flex;
            gap: 0.5rem;
        }
        
        .comp-action-btn {
            flex: 1;
            background: var(--accent);
            border: none;
            color: #000;
            padding: 8px 12px;
            font-size: 0.75rem;
            font-family: inherit;
            font-weight: 500;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.15s;
        }
        
        .comp-action-btn:hover:not(:disabled) {
            filter: brightness(1.1);
        }
        
        .comp-action-btn:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }
        
        .comp-action-btn.playing {
            background: #ef4444;
        }
        
        /* KEYBOARD SHORTCUTS HINT */
        .shortcuts-hint {
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.6rem;
            color: var(--text-dim);
            text-align: center;
            padding: 0.75rem;
            border-top: 1px solid var(--border);
            background: rgba(0,0,0,0.2);
        }
        
        .shortcuts-hint kbd {
            background: var(--panel-elevated);
            padding: 2px 5px;
            border-radius: 3px;
            border: 1px solid var(--border);
            margin: 0 2px;
        }
        
        /* RESPONSIVE */
        @media (max-width: 900px) {
            .main-content {
                grid-template-columns: 1fr;
            }
            
            .left-panel {
                border-right: none;
                border-bottom: 1px solid var(--border);
            }
            
            .preset-grid {
                max-height: 250px;
            }
        }
        
        @media (max-width: 500px) {
            .header {
                flex-direction: column;
                gap: 1rem;
                text-align: center;
                padding: 1rem;
            }
            
            .header-left h1 {
                font-size: 1.2rem;
            }
            
            .header-controls {
                width: 100%;
                justify-content: center;
            }
            
            .left-panel {
                padding: 1rem;
            }
            
            .right-panel {
                padding: 1rem;
            }
            
            #visualizer {
                height: 50px;
            }
            
            .preset-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .fade-row {
                grid-template-columns: 1fr;
            }
            
            .category-legend {
                justify-content: center;
            }
            
            .preset-filter {
                flex-wrap: wrap;
                justify-content: center;
                gap: 4px;
            }
            
            .section-header {
                flex-direction: column;
                gap: 8px;
                align-items: flex-start;
            }
        }

        /* MOBILE APP (CAPACITOR) OPTIMIZATIONS */

        /* Safe area insets for notched devices */
        body {
            padding-top: max(20px, env(safe-area-inset-top));
            padding-bottom: max(20px, env(safe-area-inset-bottom));
            padding-left: max(20px, env(safe-area-inset-left));
            padding-right: max(20px, env(safe-area-inset-right));
        }

        /* Prevent pull-to-refresh and overscroll */
        html, body {
            overscroll-behavior: none;
            -webkit-overflow-scrolling: touch;
        }

        /* Remove tap highlight on mobile */
        * {
            -webkit-tap-highlight-color: transparent;
        }

        /* Improve touch targets */
        button,
        .preset-btn,
        .timer-preset-btn,
        .voice-tab,
        select {
            touch-action: manipulation;
        }

        /* Prevent text selection on UI elements */
        .header,
        .control-panel,
        .timer-panel,
        .voice-tabs,
        .preset-filter,
        .viz-toggle {
            user-select: none;
            -webkit-user-select: none;
        }

        /* Allow text selection in composition editor */
        #compositionEditor {
            user-select: text;
            -webkit-user-select: text;
        }

        /* Content pages (physics.html, docs.html) */
        .content-page {
            max-width: 800px;
            margin: 40px auto;
            padding: 20px;
            line-height: 1.7;
            color: var(--text);
        }

        .content-page h1 {
            color: var(--accent-secondary);
            font-size: 2rem;
            margin-bottom: 1rem;
        }

        .content-page h2 {
            color: var(--accent-secondary);
            font-size: 1.4rem;
            margin-top: 2rem;
            margin-bottom: 0.75rem;
        }

        .content-page h3 {
            color: var(--accent);
            font-size: 1.1rem;
            margin-top: 1.5rem;
        }

        .content-page p {
            margin-bottom: 1rem;
            color: var(--text-dim);
        }

        .content-page code {
            background: var(--panel-elevated);
            padding: 2px 6px;
            border-radius: 4px;
            font-family: 'JetBrains Mono', monospace;
            color: var(--accent);
            font-size: 0.9em;
        }

        .content-page pre {
            background: var(--panel);
            padding: 1rem;
            border-radius: 8px;
            overflow-x: auto;
            border: 1px solid var(--border);
            margin: 1rem 0;
        }

        .content-page pre code {
            background: none;
            padding: 0;
        }

        .content-page table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }

        .content-page th,
        .content-page td {
            text-align: left;
            padding: 12px;
            border-bottom: 1px solid var(--border);
        }

        .content-page th {
            color: var(--accent-secondary);
            font-weight: 500;
        }

        .content-page td {
            color: var(--text-dim);
        }

        .content-page ul,
        .content-page ol {
            color: var(--text-dim);
            padding-left: 1.5rem;
            margin-bottom: 1rem;
        }

        .content-page li {
            margin-bottom: 0.5rem;
        }

        .back-link {
            display: inline-block;
            color: var(--accent);
            text-decoration: none;
            font-size: 0.9rem;
            margin-bottom: 2rem;
            transition: color 0.15s;
        }

        .back-link:hover {
            color: var(--text);
        }

        .math-block {
            margin: 1.5rem 0;
            padding: 1rem;
            background: var(--panel);
            border-radius: 8px;
            text-align: center;
            font-size: 1.2rem;
            border: 1px solid var(--border);
        }

        /* Individual Preset Pages */
        .preset-page {
            max-width: 700px;
        }

        .breadcrumb {
            font-size: 0.85rem;
            color: var(--text-dim);
            margin-bottom: 2rem;
        }

        .breadcrumb a {
            color: var(--accent);
            text-decoration: none;
        }

        .breadcrumb a:hover {
            text-decoration: underline;
        }

        .breadcrumb .separator {
            margin: 0 0.5rem;
            color: var(--border);
        }

        .preset-header {
            text-align: center;
            margin-bottom: 2rem;
        }

        .preset-category-badge {
            display: inline-block;
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 500;
            color: white;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 0.75rem;
        }

        .preset-header h1 {
            font-size: 2.5rem;
            margin: 0 0 0.5rem 0;
            color: var(--text);
        }

        .preset-tagline {
            font-size: 1.1rem;
            color: var(--text-dim);
            margin: 0;
        }

        .preset-cta {
            text-align: center;
            margin: 2.5rem 0;
            padding: 2rem;
            background: var(--panel);
            border-radius: 12px;
            border: 1px solid var(--border);
        }

        .play-preset-btn {
            display: inline-block;
            padding: 1rem 2.5rem;
            background: var(--accent);
            color: var(--bg);
            font-size: 1.1rem;
            font-weight: 600;
            text-decoration: none;
            border-radius: 50px;
            transition: all 0.2s;
        }

        .play-preset-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 30px var(--accent-glow);
        }

        .cta-hint {
            margin: 1rem 0 0 0;
            font-size: 0.85rem;
            color: var(--text-dim);
        }

        .preset-details {
            margin: 2rem 0;
        }

        .preset-details h2 {
            color: var(--text);
            font-size: 1.4rem;
            margin: 0 0 1rem 0;
        }

        .preset-details h3 {
            color: var(--accent-secondary);
            font-size: 1.1rem;
            margin: 1.5rem 0 0.75rem 0;
        }

        .preset-details p {
            color: var(--text-dim);
            line-height: 1.7;
        }

        .preset-details ul {
            color: var(--text-dim);
            padding-left: 1.25rem;
        }

        .preset-details li {
            margin-bottom: 0.5rem;
        }

        .preset-specs {
            display: grid;
            grid-template-columns: 140px 1fr;
            gap: 0.5rem 1rem;
            background: var(--panel);
            padding: 1rem 1.25rem;
            border-radius: 8px;
            border: 1px solid var(--border);
        }

        .preset-specs dt {
            color: var(--text-dim);
            font-size: 0.85rem;
        }

        .preset-specs dd {
            color: var(--text);
            margin: 0;
            font-size: 0.85rem;
        }

        .related-presets {
            margin: 2.5rem 0;
            padding: 1.5rem;
            background: var(--panel);
            border-radius: 12px;
            border: 1px solid var(--border);
        }

        .related-presets h2 {
            color: var(--text);
            font-size: 1.1rem;
            margin: 0 0 1rem 0;
        }

        .related-presets ul {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
        }

        .related-presets li {
            margin: 0;
        }

        .related-presets a {
            display: inline-block;
            padding: 0.5rem 1rem;
            background: var(--panel-elevated);
            border: 1px solid var(--border);
            border-radius: 6px;
            color: var(--accent);
            text-decoration: none;
            font-size: 0.85rem;
            transition: all 0.15s;
        }

        .related-presets a:hover {
            border-color: var(--accent);
            background: rgba(0, 229, 204, 0.1);
        }

        .preset-nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 3rem;
            padding-top: 2rem;
            border-top: 1px solid var(--border);
        }

        .preset-nav a {
            color: var(--accent);
            text-decoration: none;
            font-size: 0.9rem;
        }

        .preset-nav a:hover {
            text-decoration: underline;
        }

        .preset-nav .back-to-app {
            padding: 0.5rem 1rem;
            background: var(--panel-elevated);
            border: 1px solid var(--border);
            border-radius: 6px;
        }

        .preset-nav .back-to-app:hover {
            border-color: var(--accent);
            text-decoration: none;
        }

        @media (max-width: 600px) {
            .preset-header h1 {
                font-size: 1.8rem;
            }

            .preset-specs {
                grid-template-columns: 1fr;
            }

            .preset-specs dt {
                margin-top: 0.5rem;
                color: var(--accent);
            }

            .preset-nav {
                flex-direction: column;
                gap: 1rem;
            }
        }