.header{position:sticky;top:0;background:#fffffff2;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);box-shadow:0 2px 8px #0000001a;z-index:100}.header-container{max-width:1200px;margin:0 auto;padding:1rem 2rem;display:flex;justify-content:space-between;align-items:center}.logo{font-size:1.5rem;font-weight:700;color:var(--primary-color)}.nav{display:flex;gap:2rem}.nav a{color:var(--text-secondary);text-decoration:none;font-weight:500;transition:color .3s ease}.nav a:hover{color:var(--primary-color)}@media (max-width: 768px){.nav{display:none}}.hero{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:#fff;text-align:center;padding:calc(var(--spacing-unit) * 12) calc(var(--spacing-unit) * 2);min-height:80vh;display:flex;align-items:center;justify-content:center}.hero-content{max-width:800px}.hero h1{font-size:4rem;margin-bottom:calc(var(--spacing-unit) * 3);animation:fadeInUp .8s ease}.hero .subtitle{font-size:2rem;margin-bottom:calc(var(--spacing-unit) * 4);opacity:.9;animation:fadeInUp .8s ease .2s both}.hero .description{font-size:1.2rem;margin-bottom:calc(var(--spacing-unit) * 6);opacity:.8;line-height:1.6;animation:fadeInUp .8s ease .4s both}.cta-buttons{display:flex;gap:calc(var(--spacing-unit) * 3);justify-content:center;animation:fadeInUp .8s ease .6s both}.primary-button,.secondary-button{padding:1rem 2rem;border-radius:8px;font-weight:600;text-decoration:none;transition:transform .3s ease}.primary-button{background:#fff;color:var(--primary-color)}.secondary-button{background:#fff3;color:#fff}.primary-button:hover,.secondary-button:hover{transform:translateY(-2px)}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.feature-card{background:var(--bg-primary);border-radius:16px;padding:2rem;display:flex;flex-direction:column;align-items:center;text-align:center;transition:all .3s ease;box-shadow:0 4px 6px #0000001a;position:relative;overflow:hidden}.feature-card:before{content:"";position:absolute;top:0;left:0;width:100%;height:4px;background:linear-gradient(90deg,var(--primary-color),var(--secondary-color));opacity:0;transition:opacity .3s ease}.feature-card:hover:before{opacity:1}.feature-icon-wrapper{width:80px;height:80px;display:flex;align-items:center;justify-content:center;background:var(--bg-secondary);border-radius:50%;margin-bottom:1.5rem;transition:transform .3s ease}.feature-card:hover .feature-icon-wrapper{transform:scale(1.1)}.feature-icon-wrapper svg{width:40px;height:40px;color:var(--primary-color)}.feature-title{font-size:1.5rem;font-weight:600;color:var(--text-primary);margin:0 0 1rem}.feature-description{font-size:1rem;line-height:1.6;color:var(--text-secondary);margin:0}@media (prefers-color-scheme: dark){.feature-card{background:#2a2a2a}.feature-icon-wrapper{background:#333}.feature-title{color:#fff}.feature-description{color:#b3b3b3}}@media (max-width: 768px){.feature-card{padding:1.5rem}.feature-icon-wrapper{width:60px;height:60px}.feature-icon-wrapper svg{width:30px;height:30px}.feature-title{font-size:1.25rem}}.features{background:var(--bg-secondary)}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:calc(var(--spacing-unit) * 4);padding:0 calc(var(--spacing-unit) * 2)}.feature-card{background:var(--bg-primary);border-radius:12px;padding:calc(var(--spacing-unit) * 4);text-align:center;transition:transform .3s ease,box-shadow .3s ease;box-shadow:0 4px 6px #0000001a}.feature-card:hover{transform:translateY(-5px);box-shadow:0 8px 15px #0000001a}.feature-icon{width:64px;height:64px;margin:0 auto calc(var(--spacing-unit) * 3);color:var(--primary-color)}.feature-card h3{font-size:1.5rem;margin-bottom:calc(var(--spacing-unit) * 2);color:var(--text-primary)}.feature-card p{color:var(--text-secondary);line-height:1.6}.components{background:var(--bg-primary)}.components-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:calc(var(--spacing-unit) * 4)}.component-card{background:var(--bg-secondary);border-radius:12px;padding:calc(var(--spacing-unit) * 4);transition:transform .3s ease;border:1px solid rgba(0,0,0,.1)}.component-card:hover{transform:translateY(-5px)}.component-card h3{font-size:1.5rem;color:var(--primary-color);margin-bottom:calc(var(--spacing-unit) * 2)}.component-type{font-size:1rem;color:var(--text-secondary);margin-bottom:calc(var(--spacing-unit) * 2);font-weight:500}.component-card p{color:var(--text-secondary);line-height:1.6}.tutorials{background:var(--bg-secondary);padding:4rem 2rem}.tutorials-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem;max-width:1200px;margin:0 auto}.video-card{background:var(--bg-primary);border-radius:12px;overflow:hidden;cursor:pointer;transition:transform .3s ease,box-shadow .3s ease;box-shadow:0 4px 6px #0000001a}.video-card:hover{transform:translateY(-5px);box-shadow:0 8px 15px #0000001a}.video-thumbnail{position:relative;padding-top:56.25%;background:#000}.video-thumbnail iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:none}.play-overlay{position:absolute;top:0;left:0;width:100%;height:100%;display:flex;align-items:center;justify-content:center;background:#0000004d;opacity:0;transition:opacity .3s ease}.video-card:hover .play-overlay{opacity:1}.play-overlay svg{width:48px;height:48px;color:#fff}.video-card h3{padding:1rem;margin:0;font-size:1rem;color:var(--text-primary);line-height:1.4}@media (max-width: 768px){.tutorials-grid{grid-template-columns:1fr}}:root{--primary-color: #4a90e2;--secondary-color: #34495e;--text-primary: #333333;--text-secondary: #666666;--bg-primary: #ffffff;--bg-secondary: #f5f7fa;--spacing-unit: 8px}.app{min-height:100vh;display:flex;flex-direction:column}main{flex:1}section{padding:calc(var(--spacing-unit) * 8) calc(var(--spacing-unit) * 2);max-width:1200px;margin:0 auto;width:100%}h2{text-align:center;font-size:2.5rem;margin-bottom:calc(var(--spacing-unit) * 6);color:var(--text-primary)}