:root{--primary-color: #3b82f6;--primary-dark: #2563eb;--primary-light: #93c5fd;--secondary-color: #10b981;--accent-color: #f59e0b;--background: #ffffff;--surface: #f8fafc;--surface-2: #f1f5f9;--text-primary: #1e293b;--text-secondary: #64748b;--text-muted: #94a3b8;--border: #e2e8f0;--border-light: #f1f5f9;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .1), 0 8px 10px -6px rgb(0 0 0 / .1);--radius-sm: .375rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:Inter,Noto Sans JP,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;line-height:1.6;color:var(--text-primary);background:var(--background);font-feature-settings:"cv02","cv03","cv04","cv11";min-height:100vh;display:flex;flex-direction:column}.navbar{background:#fffffff2;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border-light);position:sticky;top:0;z-index:100;transition:all .3s ease}.nav-container{max-width:1400px;margin:0 auto;padding:0 1rem;display:flex;align-items:center;justify-content:space-between;height:4rem}.nav-brand{display:flex;align-items:center;gap:.3rem;font-weight:700;font-size:1.1rem;color:var(--primary-color);text-decoration:none;white-space:nowrap}.brand-icon{font-size:1.3rem}.brand-text{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.nav-links{display:flex;list-style:none;gap:1.2rem;align-items:center;flex-wrap:nowrap}.nav-link{text-decoration:none;color:var(--text-secondary);font-weight:500;transition:all .3s ease;position:relative;padding:.5rem .4rem;white-space:nowrap;font-size:.875rem}.nav-link:hover{color:var(--primary-color);transform:translateY(-1px)}.nav-link:after{content:"";position:absolute;bottom:0;left:0;width:0;height:2px;background:linear-gradient(90deg,var(--primary-color),var(--secondary-color));transition:width .3s ease}.nav-link:hover:after{width:100%}.nav-toggle{display:none;flex-direction:column;cursor:pointer;gap:.25rem}.nav-toggle span{width:1.5rem;height:2px;background:var(--text-primary);transition:all .3s ease}.main-content{flex:1;max-width:1200px;margin:0 auto;padding:3rem 1.5rem;width:100%}.footer{background:var(--surface-2);border-top:1px solid var(--border);margin-top:auto}.footer-content{max-width:1200px;margin:0 auto;padding:2rem 1.5rem;text-align:center;color:var(--text-muted);font-size:.875rem}.footer-main{margin-bottom:1.5rem}.footer-links{display:flex;justify-content:center;align-items:center;gap:.5rem;margin-top:.5rem;flex-wrap:wrap}.footer-link{color:var(--text-muted);text-decoration:none;transition:color .3s ease;display:flex;align-items:center;gap:.25rem}.footer-link:hover{color:var(--primary-color)}.footer-separator{color:var(--border);margin:0 .25rem}.footer-license{border-top:1px solid var(--border);padding-top:1.5rem;display:flex;flex-direction:column;align-items:center;gap:.75rem}.license-link{display:inline-block;transition:opacity .3s ease}.license-link:hover{opacity:.8}.license-text{margin:0;font-size:.75rem;line-height:1.4}.license-text a{color:var(--text-muted);text-decoration:underline;transition:color .3s ease}.license-text a:hover{color:var(--primary-color)}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.2;margin-bottom:1rem}h1{font-size:2.5rem;background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:1.5rem}h2{font-size:2rem;color:var(--text-primary)}h3{font-size:1.5rem;color:var(--text-primary)}p{margin-bottom:1rem;color:var(--text-secondary)}a{color:var(--primary-color);text-decoration:none;transition:color .3s ease}a:hover{color:var(--primary-dark)}.card{background:#fff;border-radius:var(--radius-lg);box-shadow:var(--shadow-md);padding:2rem;margin-bottom:2rem;border:1px solid var(--border-light);transition:all .3s ease}.card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.75rem 1.5rem;border-radius:var(--radius-md);font-weight:500;text-decoration:none;transition:all .3s ease;cursor:pointer;border:none;font-size:1rem}.btn-primary{background:var(--primary-color);color:#fff}.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-secondary{background:var(--surface);color:var(--text-primary);border:1px solid var(--border)}.btn-secondary:hover{background:var(--surface-2);transform:translateY(-1px)}@media (max-width: 768px){.nav-links{display:none;flex-direction:column;position:absolute;top:100%;left:0;right:0;background:#fff;box-shadow:0 2px 10px #0000001a;padding:1rem;gap:0;z-index:1000}.nav-links.active,.nav-toggle{display:flex}.navbar{position:relative}.nav-link{padding:1rem;border-bottom:1px solid #e2e8f0;font-size:1rem}.nav-link:last-child{border-bottom:none}.main-content{padding:2rem 1rem}h1{font-size:2rem}h2{font-size:1.5rem}.card{padding:1.5rem}.footer-links{flex-direction:column;gap:.75rem}.footer-separator{display:none}.footer-license{gap:1rem}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(2rem)}to{opacity:1;transform:translateY(0)}}.fade-in-up{animation:fadeInUp .6s ease-out}.learning-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem;margin:2rem 0}.topic-card{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border-radius:var(--radius-xl);padding:2rem;transition:all .3s ease;position:relative;overflow:hidden}.topic-card:before{content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(255,255,255,.1),transparent);pointer-events:none}.topic-card:hover{transform:translateY(-4px) scale(1.02);box-shadow:var(--shadow-xl)}.topic-card h3{color:#fff;margin-bottom:1rem}.topic-card p{color:#ffffffe6}pre,code{font-family:Fira Code,JetBrains Mono,Consolas,monospace;font-feature-settings:"liga" 1,"calt" 1}pre{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-md);padding:1.5rem;overflow-x:auto;margin:1.5rem 0}code{background:var(--surface);padding:.25rem .5rem;border-radius:var(--radius-sm);font-size:.875rem}