:root{--bg-primary: #fafafa;--bg-secondary: #f5f5f5;--bg-card: #ffffff;--bg-card-hover: #fafafa;--bg-input: #ffffff;--bg-overlay: rgba(23, 23, 23, .4);--accent-cyan: #0070f3;--accent-cyan-dim: rgba(0, 112, 243, .08);--accent-cyan-glow: rgba(0, 112, 243, .15);--accent-purple: #7928ca;--accent-purple-dim: rgba(121, 40, 202, .08);--accent-purple-glow: rgba(121, 40, 202, .15);--accent-green: #0070f3;--accent-green-dim: rgba(0, 112, 243, .08);--accent-green-glow: rgba(0, 112, 243, .15);--accent-amber: #f5a623;--accent-amber-dim: rgba(245, 166, 35, .08);--accent-red: #ee0000;--accent-red-dim: rgba(238, 0, 0, .08);--text-primary: #171717;--text-secondary: #4d4d4d;--text-muted: #888888;--text-accent: var(--accent-cyan);--border-subtle: #ebebeb;--border-default: #ebebeb;--border-active: #a1a1a1;--shadow-card: 0px 1px 1px rgba(0, 0, 0, .05), 0px 2px 2px rgba(0, 0, 0, .05);--shadow-lg: 0px 1px 1px rgba(0, 0, 0, .05), 0px 8px 16px -4px rgba(0, 0, 0, .08);--glow-cyan: 0 0 12px rgba(0, 112, 243, .12);--glow-purple: 0 0 12px rgba(121, 40, 202, .12);--glow-green: 0 0 12px rgba(0, 112, 243, .12);--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;--font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;--space-xs: 8px;--space-sm: 12px;--space-md: 16px;--space-lg: 24px;--space-xl: 32px;--space-2xl: 40px;--space-3xl: 48px;--space-4xl: 64px;--radius-sm: 6px;--radius-md: 8px;--radius-lg: 12px;--radius-xl: 16px;--radius-full: 9999px;--ease-out: cubic-bezier(.16, 1, .3, 1);--ease-spring: cubic-bezier(.34, 1.56, .64, 1);--duration-fast: .15s;--duration-normal: .25s;--duration-slow: .4s}[data-theme=dark]{--bg-primary: #0a0a0a;--bg-secondary: #121212;--bg-card: #171717;--bg-card-hover: #1f1f1f;--bg-input: #0a0a0a;--bg-overlay: rgba(0, 0, 0, .7);--text-primary: #ffffff;--text-secondary: #a1a1a1;--text-muted: #666666;--border-subtle: #333333;--border-default: #444444;--border-active: #888888;--shadow-card: 0px 1px 2px rgba(0, 0, 0, .4), inset 0px 0px 0px 1px rgba(255, 255, 255, .05);--shadow-lg: 0px 8px 16px -4px rgba(0, 0, 0, .5), inset 0px 0px 0px 1px rgba(255, 255, 255, .1);--accent-cyan: #00dfd8;--accent-cyan-dim: rgba(0, 223, 216, .15);--accent-cyan-glow: rgba(0, 223, 216, .35);--accent-purple: #ff0080;--accent-purple-dim: rgba(255, 0, 128, .15);--accent-purple-glow: rgba(255, 0, 128, .35);--accent-green: #10b981;--accent-green-dim: rgba(16, 185, 129, .15);--accent-green-glow: rgba(16, 185, 129, .35);--glow-cyan: 0 0 15px rgba(0, 223, 216, .25);--glow-purple: 0 0 15px rgba(255, 0, 128, .25);--glow-green: 0 0 15px rgba(16, 185, 129, .25)}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden}body{font-family:var(--font-sans);background:var(--bg-primary);color:var(--text-primary);line-height:1.6;min-height:100vh;overflow-x:hidden;font-feature-settings:"ss01","ss02"}.skip-link{position:absolute;top:-100px;left:20px;background:var(--accent-cyan);color:#fff;padding:8px 16px;border-radius:var(--radius-sm);z-index:10000;font-weight:600;font-size:.85rem;transition:top var(--duration-fast) var(--ease-out);text-decoration:none}.skip-link:focus-visible{top:20px;outline:2px solid #ffffff;outline-offset:-4px}body,.glass-card,.action-btn,.preset-btn,.piano-key,.page-tab,.bb-preset-card,.theme-dot,.bb-preset-freq,.bb-preset-header{transition:background-color var(--duration-normal) var(--ease-out),border-color var(--duration-normal) var(--ease-out),color var(--duration-normal) var(--ease-out),box-shadow var(--duration-normal) var(--ease-out),transform var(--duration-fast) var(--ease-out)}body:before{content:"";position:fixed;inset:0;background-image:linear-gradient(to right,var(--border-subtle) 1px,transparent 1px),linear-gradient(to bottom,var(--border-subtle) 1px,transparent 1px);background-size:80px 80px;pointer-events:none;z-index:0;opacity:.4}.vercel-mesh-gradient{position:absolute;top:0;left:50%;transform:translate(-50%);width:100vw;height:400px;background-image:radial-gradient(at 27% 37%,hsla(215,100%,72%,1) 0px,transparent 0%),radial-gradient(at 97% 21%,hsla(125,98%,72%,1) 0px,transparent 50%),radial-gradient(at 52% 99%,hsla(354,98%,61%,1) 0px,transparent 50%),radial-gradient(at 10% 29%,hsla(256,96%,67%,1) 0px,transparent 50%),radial-gradient(at 97% 96%,hsla(38,100%,74%,1) 0px,transparent 50%),radial-gradient(at 33% 50%,hsla(222,90%,55%,1) 0px,transparent 50%),radial-gradient(at 79% 53%,hsla(343,98%,52%,1) 0px,transparent 50%);filter:blur(80px);opacity:.06;pointer-events:none;z-index:0;transition:opacity var(--duration-slow) var(--ease-out)}[data-theme=dark] .vercel-mesh-gradient{opacity:.12}.app-container{position:relative;z-index:1;max-width:1200px;margin:0 auto;padding:var(--space-xl) var(--space-md)}.app-header{display:flex;align-items:center;justify-content:space-between;padding-bottom:var(--space-md);margin-bottom:var(--space-xl);border-bottom:1px solid var(--border-subtle)}.app-logo{display:flex;align-items:center;gap:var(--space-sm);text-decoration:none}.app-logo-icon{width:32px;height:32px;background:#171717;color:#fff;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-size:16px;transition:background-color var(--duration-fast)}[data-theme=dark] .app-logo-icon{background:#fff;color:#171717}.app-logo-text{font-size:1.15rem;font-weight:600;letter-spacing:-.8px;color:var(--text-primary)}.app-logo-text span{color:var(--text-muted);font-weight:400}.header-actions{display:flex;align-items:center;gap:var(--space-sm)}.header-nav{display:flex;align-items:center;gap:var(--space-xs)}.header-nav-link{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;font-size:.8rem;font-weight:500;color:var(--text-secondary);text-decoration:none;border-radius:var(--radius-full);transition:color var(--duration-fast) var(--ease-out),background-color var(--duration-fast) var(--ease-out)}.header-nav-link:hover{color:var(--text-primary);background:var(--bg-secondary)}.header-nav-link.active{color:var(--accent-cyan);background:var(--accent-cyan-dim)}.header-nav-link svg{flex-shrink:0}.hero-section{text-align:center;margin-bottom:var(--space-3xl);position:relative;z-index:1}.hero-title{font-size:clamp(1.85rem,5vw,2.85rem);font-weight:600;letter-spacing:-2.4px;line-height:1.1;margin-bottom:var(--space-sm);color:var(--text-primary);text-wrap:balance}.hero-subtitle{font-size:1.05rem;color:var(--text-secondary);max-width:650px;margin:0 auto;text-wrap:balance}.glass-card{position:relative;background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-md);box-shadow:var(--shadow-card);padding:var(--space-lg);transition:border-color var(--duration-normal) var(--ease-out),box-shadow var(--duration-normal) var(--ease-out);overflow:hidden}.glass-card:before{content:"";position:absolute;top:0;left:0;width:100%;height:100%;background:radial-gradient(350px circle at var(--mouse-x, 0px) var(--mouse-y, 0px),rgba(255,255,255,.04),transparent 60%);pointer-events:none;z-index:0;opacity:0;transition:opacity .3s var(--ease-out);display:none}.glass-card:hover:before{opacity:0}.glass-card>*{position:relative;z-index:1}.glass-card:hover{border-color:#ffffff1f;box-shadow:var(--shadow-card)}.glass-card-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--space-md)}.glass-card-title{font-size:.8rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--text-secondary)}.main-grid{display:grid;grid-template-columns:1fr 1fr;grid-template-rows:auto;gap:var(--space-md);margin-bottom:var(--space-lg)}.main-grid .visualizer-card,.main-grid .play-controls-card{grid-column:1 / -1}@media(min-width:769px){.main-grid .waveform-card{grid-row:span 2}}.visualizer-card{position:relative;overflow:hidden;padding:var(--space-md);margin-bottom:var(--space-lg);border:none!important;box-shadow:none!important}.visualizer-card:hover{border:none!important;box-shadow:none!important}.visualizer-wrapper{position:relative;background:var(--bg-primary);border:1px solid var(--border-subtle);border-radius:var(--radius-md);overflow:hidden}.visualizer-canvas{width:100%!important;max-width:100%!important;height:200px;display:block}.visualizer-tabs{display:flex;gap:var(--space-xs);position:absolute;top:var(--space-sm);right:var(--space-sm);z-index:2}.viz-tab{padding:3px 10px;font-size:.65rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;border:1px solid var(--border-subtle);border-radius:var(--radius-full);background:var(--bg-secondary);color:var(--text-secondary);cursor:pointer;transition:all var(--duration-fast) var(--ease-out)}.viz-tab:hover{color:var(--text-primary);border-color:var(--border-active);background:var(--bg-card-hover)}.viz-tab.active{color:var(--accent-cyan);border-color:transparent;background:var(--accent-cyan-dim)}.visualizer-overlay-info{position:absolute;bottom:var(--space-sm);left:var(--space-sm);display:flex;gap:var(--space-md);z-index:2}.viz-info-item{font-family:var(--font-mono);font-size:.7rem;color:var(--text-secondary);background:var(--bg-secondary);border:1px solid var(--border-subtle);padding:2px 8px;border-radius:var(--radius-sm)}.viz-info-item strong{color:var(--accent-cyan)}.play-controls-card{display:flex;align-items:center;justify-content:center;gap:var(--space-lg);padding:var(--space-lg) var(--space-xl);margin-bottom:var(--space-lg)}.play-btn{width:72px;height:72px;border-radius:50%;border:2px solid var(--accent-cyan);background:var(--accent-cyan-dim);color:var(--accent-cyan);display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:1.5rem;transition:all var(--duration-normal) var(--ease-spring);position:relative;flex-shrink:0}.play-btn:before{content:"";position:absolute;inset:-4px;border-radius:50%;border:1px solid rgba(0,229,255,.1);transition:all var(--duration-normal) var(--ease-out)}.play-btn:hover{background:#00e5ff40;box-shadow:var(--glow-cyan);transform:scale(1.08)}.play-btn:hover:before{border-color:#00e5ff4d;inset:-8px}.play-btn:active{transform:scale(.95)}.play-btn.playing{border-color:var(--accent-green);background:var(--accent-green-dim);color:var(--accent-green);box-shadow:var(--glow-green);animation:pulse-ring 2s ease-out infinite}.play-btn.playing:before{border-color:#10b98133}@keyframes pulse-ring{0%{box-shadow:0 0 #10b9814d}70%{box-shadow:0 0 0 12px #10b98100}to{box-shadow:0 0 #10b98100}}.play-btn svg{width:28px;height:28px;fill:currentColor}.freq-display{text-align:center;flex-shrink:0}.freq-value{background:none;border:none;padding:0;outline:none;font-family:var(--font-mono);font-size:clamp(2rem,5vw,3.5rem);font-weight:700;letter-spacing:-.02em;color:var(--text-primary);line-height:1;cursor:pointer;transition:color var(--duration-fast)}.freq-value:hover{color:var(--accent-cyan)}.freq-unit{font-size:.875rem;color:var(--text-muted);font-weight:400;margin-left:4px}.freq-note{font-size:.8rem;color:var(--accent-purple);font-weight:500;margin-top:4px}.play-side-controls{display:flex;flex-direction:column;gap:var(--space-sm)}.octave-btn{padding:6px 14px;font-family:var(--font-mono);font-size:.8rem;font-weight:600;background:var(--bg-input);border:1px solid var(--border-subtle);border-radius:var(--radius-sm);color:var(--text-secondary);cursor:pointer;transition:border-color var(--duration-fast) var(--ease-out),background-color var(--duration-fast) var(--ease-out),color var(--duration-fast) var(--ease-out)}.octave-btn:hover{border-color:var(--accent-purple);color:var(--accent-purple);background:var(--accent-purple-dim)}.octave-btn:focus-visible{outline:2px solid var(--accent-purple);outline-offset:2px}.control-group{margin-bottom:var(--space-md)}.control-group:last-child{margin-bottom:0}.control-label{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--space-sm)}.control-label-text{font-size:.8rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--text-secondary)}.control-label-value{font-family:var(--font-mono);font-size:.8rem;font-weight:500;color:var(--accent-cyan);background:var(--accent-cyan-dim);padding:2px 10px;border-radius:var(--radius-full);border:1px solid var(--border-subtle)}button.control-label-value{cursor:pointer;outline:none;background:var(--accent-cyan-dim);border:1px solid rgba(0,223,216,.2);display:inline-flex;align-items:center;justify-content:center;transition:background-color var(--duration-fast) var(--ease-out),border-color var(--duration-fast) var(--ease-out),color var(--duration-fast) var(--ease-out),box-shadow var(--duration-fast) var(--ease-out),transform var(--duration-fast) var(--ease-out)}button.control-label-value:hover{background:#00dfd840;border-color:var(--accent-cyan);box-shadow:var(--glow-cyan);transform:translateY(-1px)}button.control-label-value:active{transform:translateY(0) scale(.96)}button.control-label-value:focus-visible{outline:2px solid var(--accent-cyan);outline-offset:2px}.range-slider-container{position:relative;width:100%;display:flex;align-items:center}.range-slider-container .range-slider{position:relative;z-index:1}.slider-center-dot{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:12px;height:12px;border-radius:50%;background:var(--bg-card);border:2px solid var(--accent-cyan);cursor:pointer;z-index:2;padding:0;outline:none;transition:transform var(--duration-fast) var(--ease-out),box-shadow var(--duration-fast) var(--ease-out),opacity var(--duration-fast) var(--ease-out);opacity:1;pointer-events:auto}.slider-center-dot:after{content:"";position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:4px;height:4px;border-radius:50%;background:var(--accent-cyan)}.slider-center-dot:hover{transform:translate(-50%,-50%) scale(1.2);box-shadow:var(--glow-cyan)}.slider-center-dot:active{transform:translate(-50%,-50%) scale(.9)}.slider-center-dot.at-center{pointer-events:none;opacity:0}.range-slider{-webkit-appearance:none;appearance:none;width:100%;height:6px;background:linear-gradient(to right,var(--accent-cyan) var(--fill, 0%),var(--bg-secondary) var(--fill, 0%));border-radius:var(--radius-full);outline:none;cursor:pointer;position:relative}.range-slider.purple{background:linear-gradient(to right,var(--accent-purple) var(--fill, 0%),var(--bg-secondary) var(--fill, 0%))}.range-slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:18px;height:18px;border-radius:50%;background:var(--accent-cyan);border:2px solid var(--bg-primary);box-shadow:var(--shadow-card);cursor:pointer;transition:transform var(--duration-fast) var(--ease-spring),background-color var(--duration-fast) var(--ease-out)}.range-slider::-webkit-slider-thumb:hover{transform:scale(1.2)}.range-slider::-moz-range-thumb{width:18px;height:18px;border-radius:50%;background:var(--accent-cyan);border:2px solid var(--bg-primary);box-shadow:var(--shadow-card);cursor:pointer}.range-slider.purple::-webkit-slider-thumb{background:var(--accent-purple)}.range-slider.purple::-moz-range-thumb{background:var(--accent-purple)}.range-slider:focus-visible::-webkit-slider-thumb{outline:2px solid var(--accent-cyan);outline-offset:3px}.range-slider.purple:focus-visible::-webkit-slider-thumb{outline:2px solid var(--accent-purple);outline-offset:3px}.range-slider-marks{position:relative;height:14px;margin-top:4px;font-family:var(--font-mono);font-size:.65rem;color:var(--text-muted);width:100%}.range-slider-marks span{position:absolute;transform:translate(-50%);white-space:nowrap}.range-slider-marks span:first-child{transform:translate(0)}.range-slider-marks span:last-child{transform:translate(-100%)}.waveform-selector{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--space-sm)}.wave-btn{display:flex;flex-direction:column;align-items:center;gap:6px;padding:var(--space-sm) var(--space-xs);background:var(--bg-input);border:1px solid var(--border-subtle);border-radius:var(--radius-md);color:var(--text-muted);cursor:pointer;transition:border-color var(--duration-fast) var(--ease-out),background-color var(--duration-fast) var(--ease-out),color var(--duration-fast) var(--ease-out)}.wave-btn:hover{border-color:var(--border-default);color:var(--text-secondary);background:var(--bg-card-hover)}.wave-btn.active{border-color:var(--accent-cyan);color:var(--accent-cyan);background:var(--accent-cyan-dim)}.wave-btn:focus-visible{outline:2px solid var(--accent-cyan);outline-offset:2px}.wave-btn svg{width:40px;height:24px;stroke:currentColor;fill:none;stroke-width:2}.wave-btn-label{font-size:.7rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em}.presets-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(100px,1fr));gap:var(--space-sm)}.preset-btn{padding:8px 12px;font-size:.75rem;font-weight:500;background:var(--bg-input);border:1px solid var(--border-subtle);border-radius:var(--radius-sm);color:var(--text-secondary);cursor:pointer;text-align:center;transition:border-color var(--duration-fast) var(--ease-out),background-color var(--duration-fast) var(--ease-out),color var(--duration-fast) var(--ease-out);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.preset-btn:hover{border-color:var(--accent-purple);color:var(--accent-purple);background:var(--accent-purple-dim);transform:translateY(-1px)}.preset-btn.active{border-color:var(--accent-cyan);color:var(--accent-cyan);background:var(--accent-cyan-dim)}.preset-btn:focus-visible{outline:2px solid var(--accent-purple);outline-offset:2px}.adsr-controls{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--space-sm)}.adsr-knob{display:flex;flex-direction:column;align-items:center;gap:var(--space-xs)}.adsr-knob label{font-size:.65rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted)}.adsr-knob input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:4px;background:var(--bg-secondary);border-radius:var(--radius-full);outline:none;cursor:pointer}.adsr-knob input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:14px;height:14px;border-radius:50%;background:var(--accent-amber);border:2px solid var(--bg-card);box-shadow:0 0 6px #f59e0b66;cursor:pointer}.adsr-knob input[type=range]::-moz-range-thumb{width:14px;height:14px;border-radius:50%;background:var(--accent-amber);border:2px solid var(--bg-card);box-shadow:0 0 6px #f59e0b66;cursor:pointer}.adsr-value{font-family:var(--font-mono);font-size:.7rem;color:var(--accent-amber)}.adsr-canvas-wrapper{background:var(--bg-secondary);border:1px solid var(--border-subtle);border-radius:var(--radius-sm);overflow:hidden;margin-bottom:var(--space-sm)}.adsr-canvas{width:100%!important;max-width:100%!important;height:60px;display:block}.timer-controls{display:flex;gap:var(--space-sm);flex-wrap:wrap}.timer-btn{padding:6px 14px;font-size:.75rem;font-weight:600;background:var(--bg-input);border:1px solid var(--border-subtle);border-radius:var(--radius-full);color:var(--text-secondary);cursor:pointer;transition:all var(--duration-fast) var(--ease-out)}.timer-btn:hover{border-color:var(--accent-amber);color:var(--accent-amber)}.timer-btn.active{background:var(--accent-amber-dim);border-color:var(--accent-amber);color:var(--accent-amber)}.timer-display{font-family:var(--font-mono);font-size:1rem;font-weight:600;color:var(--accent-amber);padding:4px 12px;background:var(--accent-amber-dim);border-radius:var(--radius-sm);border:1px solid rgba(245,158,11,.2)}.action-buttons{display:flex;gap:var(--space-sm);flex-wrap:wrap}.action-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;font-size:.8rem;font-weight:600;background:var(--bg-input);border:1px solid var(--border-subtle);border-radius:var(--radius-md);color:var(--text-secondary);cursor:pointer;transition:all var(--duration-fast) var(--ease-out)}.action-btn:hover{border-color:var(--border-default);color:var(--text-primary);background:var(--bg-card-hover);transform:translateY(-1px)}.action-btn svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:2}.action-btn.primary{background:var(--accent-cyan-dim);border-color:#00e5ff33;color:var(--accent-cyan)}.action-btn.primary:hover{background:#00e5ff40;border-color:var(--accent-cyan);box-shadow:var(--glow-cyan)}.icon-btn{width:36px;height:36px;border-radius:var(--radius-md);border:1px solid var(--border-subtle);background:var(--bg-input);color:var(--text-muted);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:border-color var(--duration-fast) var(--ease-out),background-color var(--duration-fast) var(--ease-out),color var(--duration-fast) var(--ease-out)}.icon-btn:hover{border-color:var(--border-default);color:var(--text-secondary);background:var(--bg-card-hover)}.icon-btn:focus-visible{outline:2px solid var(--accent-cyan);outline-offset:2px}.icon-btn svg{width:18px;height:18px;stroke:currentColor;fill:none;stroke-width:2}.shortcuts-overlay{position:fixed;inset:0;background:var(--bg-overlay);backdrop-filter:blur(8px);z-index:1000;display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:opacity var(--duration-normal) var(--ease-out)}.shortcuts-overlay.visible{opacity:1;pointer-events:auto}.shortcuts-modal{background:var(--bg-secondary);border:1px solid var(--border-default);border-radius:var(--radius-xl);padding:var(--space-xl);max-width:500px;width:90%;max-height:80vh;overflow-y:auto;box-shadow:var(--shadow-lg)}.shortcuts-modal h2{font-size:1.25rem;font-weight:700;margin-bottom:var(--space-lg);color:var(--text-primary)}.shortcut-row{display:flex;align-items:center;justify-content:space-between;padding:var(--space-sm) 0;border-bottom:1px solid 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