:root{--color-bg-primary: #0a0a0f;--color-bg-secondary: #12121a;--color-bg-tertiary: #1a1a24;--color-bg-card: #1e1e2a;--color-bg-hover: #252532;--color-c: #ff6b6b;--color-g: #ffa94d;--color-d: #ffd43b;--color-a: #69db7c;--color-e: #38d9a9;--color-b: #4dabf7;--color-fsharp: #748ffc;--color-csharp: #9775fa;--color-gsharp: #da77f2;--color-dsharp: #f783ac;--color-asharp: #ff8787;--color-f: #ff6b6b;--color-accent-primary: #667eea;--color-accent-secondary: #764ba2;--color-accent-gradient: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));--color-text-primary: #f0f0f5;--color-text-secondary: #a0a0b0;--color-text-muted: #606070;--color-success: #69db7c;--color-warning: #ffd43b;--color-error: #ff6b6b;--color-info: #4dabf7;--font-display: "Playfair Display", Georgia, serif;--font-body: "Noto Sans JP", -apple-system, BlinkMacSystemFont, sans-serif;--space-xs: .25rem;--space-sm: .5rem;--space-md: 1rem;--space-lg: 1.5rem;--space-xl: 2rem;--space-2xl: 3rem;--space-3xl: 4rem;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--radius-xl: 16px;--radius-full: 9999px;--shadow-sm: 0 2px 4px rgba(0, 0, 0, .3);--shadow-md: 0 4px 12px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 24px rgba(0, 0, 0, .5);--shadow-glow: 0 0 20px rgba(102, 126, 234, .3);--transition-fast: .15s ease;--transition-base: .25s ease;--transition-slow: .4s ease;--z-dropdown: 100;--z-modal: 200;--z-tooltip: 300}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth}body{font-family:var(--font-body);background:var(--color-bg-primary);color:var(--color-text-primary);line-height:1.6;min-height:100vh;overflow-x:hidden}body:before{content:"";position:fixed;top:0;left:0;right:0;bottom:0;background:radial-gradient(circle at 20% 80%,rgba(102,126,234,.08) 0%,transparent 50%),radial-gradient(circle at 80% 20%,rgba(118,75,162,.08) 0%,transparent 50%);pointer-events:none;z-index:-1}#root{min-height:100vh;display:flex;flex-direction:column}h1,h2,h3,h4,h5,h6{font-family:var(--font-display);font-weight:600;line-height:1.3;color:var(--color-text-primary)}h1{font-size:2.5rem}h2{font-size:2rem}h3{font-size:1.5rem}h4{font-size:1.25rem}p{color:var(--color-text-secondary);max-width:65ch}a{color:var(--color-accent-primary);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--color-accent-secondary)}.app-container{display:flex;min-height:100vh}.sidebar{width:280px;background:var(--color-bg-secondary);border-right:1px solid rgba(255,255,255,.05);padding:var(--space-lg);display:flex;flex-direction:column;position:fixed;top:0;left:0;height:100vh;z-index:10}.sidebar-logo{display:flex;align-items:center;gap:var(--space-md);padding-bottom:var(--space-lg);border-bottom:1px solid rgba(255,255,255,.05);margin-bottom:var(--space-lg)}.sidebar-logo img{width:40px;height:40px}.sidebar-logo h1{font-size:1.25rem;background:var(--color-accent-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.sidebar-nav{flex:1;display:flex;flex-direction:column;gap:var(--space-xs)}.nav-link{display:flex;align-items:center;gap:var(--space-md);padding:var(--space-md) var(--space-md);border-radius:var(--radius-md);color:var(--color-text-secondary);transition:all var(--transition-fast);font-size:.95rem}.nav-link:hover{background:var(--color-bg-hover);color:var(--color-text-primary)}.nav-link.active{background:#667eea26;color:var(--color-accent-primary)}.nav-link .icon{font-size:1.25rem;width:24px;text-align:center}.main-content{flex:1;margin-left:280px;padding:var(--space-2xl)}.card{background:var(--color-bg-card);border-radius:var(--radius-lg);padding:var(--space-xl);border:1px solid rgba(255,255,255,.05);transition:all var(--transition-base)}.card:hover{border-color:#667eea4d;box-shadow:var(--shadow-glow)}.card-header{display:flex;align-items:center;gap:var(--space-md);margin-bottom:var(--space-lg)}.card-icon{width:48px;height:48px;display:flex;align-items:center;justify-content:center;background:var(--color-accent-gradient);border-radius:var(--radius-md);font-size:1.5rem}.card-title{font-size:1.25rem}.card-description{color:var(--color-text-secondary);font-size:.9rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-sm);padding:var(--space-md) var(--space-xl);border:none;border-radius:var(--radius-md);font-family:var(--font-body);font-size:.95rem;font-weight:500;cursor:pointer;transition:all var(--transition-fast)}.btn-primary{background:var(--color-accent-gradient);color:#fff}.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-glow)}.btn-secondary{background:var(--color-bg-tertiary);color:var(--color-text-primary);border:1px solid rgba(255,255,255,.1)}.btn-secondary:hover{background:var(--color-bg-hover);border-color:#fff3}.page-header{margin-bottom:var(--space-2xl)}.page-title{font-size:2rem;margin-bottom:var(--space-sm)}.page-subtitle{color:var(--color-text-secondary);font-size:1.1rem}.grid{display:grid;gap:var(--space-lg)}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-auto{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}.visualizer-container{background:var(--color-bg-secondary);border-radius:var(--radius-lg);overflow:hidden;position:relative}.visualizer-canvas{width:100%;height:100%;display:block}.piano{display:flex;position:relative;height:180px;background:var(--color-bg-tertiary);border-radius:var(--radius-lg);padding:var(--space-md);overflow:hidden}.piano-key{position:relative;cursor:pointer;transition:all var(--transition-fast)}.piano-key.white{width:50px;height:160px;background:linear-gradient(to bottom,#fff,#e8e8e8);border:1px solid #ccc;border-radius:0 0 var(--radius-sm) var(--radius-sm);z-index:1}.piano-key.white:hover{background:linear-gradient(to bottom,#f8f8f8,#ddd)}.piano-key.white.active{background:linear-gradient(to bottom,#ddd,#ccc);transform:translateY(2px)}.piano-key.black{width:32px;height:100px;background:linear-gradient(to bottom,#333,#000);border-radius:0 0 var(--radius-sm) var(--radius-sm);margin-left:-16px;margin-right:-16px;z-index:2}.piano-key.black:hover{background:linear-gradient(to bottom,#444,#111)}.piano-key.black.active{background:linear-gradient(to bottom,#222,#000);height:95px}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.7}}@keyframes glow{0%,to{box-shadow:0 0 5px #667eea4d}50%{box-shadow:0 0 20px #667eea99}}.fade-in{animation:fadeIn .5s ease forwards}@media (max-width: 1024px){.sidebar{width:240px}.main-content{margin-left:240px}.grid-3{grid-template-columns:repeat(2,1fr)}}@media (max-width: 768px){.sidebar{transform:translate(-100%);transition:transform var(--transition-base)}.sidebar.open{transform:translate(0)}.main-content{margin-left:0;padding:var(--space-lg)}.grid-2,.grid-3{grid-template-columns:1fr}}