:root{--primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);--secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);--accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);--success-gradient: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);--bg-primary: #0f0f23;--bg-secondary: #1a1a2e;--bg-glass: rgba(255, 255, 255, .1);--text-primary: #ffffff;--text-secondary: #b8b8ff;--text-muted: #8892b0;--color-white: #ffffff;--color-focus: #667eea;--color-border: rgba(255, 255, 255, .1);--color-border-hover: rgba(255, 255, 255, .3);--opacity-glass: .1;--opacity-hover: .2;--opacity-border: .1;--opacity-border-hover: .3;--border-radius: 20px;--border-radius-small: 12px;--shadow-lg: 0 20px 60px rgba(0, 0, 0, .4);--shadow-md: 0 10px 30px rgba(0, 0, 0, .3);--shadow-sm: 0 4px 20px rgba(0, 0, 0, .1);--transition: all .3s cubic-bezier(.4, 0, .2, 1);--transition-bounce: all .4s cubic-bezier(.68, -.55, .265, 1.55)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--bg-primary);color:var(--text-primary);line-height:1.6;overflow-x:hidden;min-height:100vh;position:relative}body:before{content:"";position:fixed;top:0;left:0;width:100%;height:100%;background:radial-gradient(ellipse at 15% 30%,rgba(41,98,255,.4) 0%,rgba(139,69,255,.2) 30%,transparent 70%),radial-gradient(ellipse at 85% 70%,rgba(138,43,226,.3) 0%,rgba(75,0,130,.2) 40%,transparent 80%),radial-gradient(ellipse at 50% 10%,rgba(25,25,112,.5) 0%,transparent 60%);z-index:-1;will-change:opacity;animation:backgroundPulse 8s ease-in-out infinite alternate}.star{position:absolute;width:2px;height:2px;background:#fff;border-radius:50%;will-change:transform,opacity}.star--bright{width:3px;height:3px;background:#ffffffe6}.star--medium{width:2px;height:2px;background:#ffffffb3}.star--small{width:1px;height:1px;background:#ffffff80}.star--blue{background:#c8c8ffb3}.star--pink{background:#ffc8ff99}.star--cyan{background:#c8ffffb3}.star--yellow{background:#ffffc899}@keyframes twinkle1{0%,to{opacity:.3;transform:scale(1)}50%{opacity:1;transform:scale(1.2)}}@keyframes twinkle2{0%,to{opacity:.2;transform:scale(1)}50%{opacity:.9;transform:scale(1.1)}}@keyframes twinkle3{0%,to{opacity:.4;transform:scale(1)}50%{opacity:1;transform:scale(1.3)}}@keyframes backgroundPulse{0%{opacity:.8}to{opacity:1}}.header{position:sticky;top:0;z-index:100;background:#0f0f23e6;border-bottom:1px solid var(--color-border);box-shadow:0 2px 20px #0000004d}.nav{max-width:1200px;margin:0 auto;padding:1rem 2rem;display:flex;justify-content:space-between;align-items:center}nav h1,.nav-brand h1{font-size:1.5rem;font-weight:700;background:var(--primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.lang-toggle{background:var(--bg-glass);border:1px solid var(--color-border);color:var(--text-primary);padding:.5rem 1rem;border-radius:var(--border-radius-small);cursor:pointer;transition:var(--transition);font-size:.9rem;will-change:transform}.lang-toggle:hover{background:rgba(255,255,255,var(--opacity-hover));transform:translateY(-1px)}.main{max-width:1200px;margin:0 auto;padding:0 2rem}.hero{text-align:center;padding:4rem 0 6rem;position:relative}.hero h1{font-size:clamp(2.5rem,5vw,4rem);font-weight:800;margin-bottom:1.5rem;background:linear-gradient(135deg,var(--color-white) 0%,var(--text-secondary) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1.2}.hero p{font-size:1.25rem;color:var(--text-secondary);max-width:600px;margin:0 auto 2rem}.hero-cta{display:inline-block;background:var(--primary-gradient);color:var(--color-white);padding:1rem 2rem;border-radius:var(--border-radius);text-decoration:none;font-weight:600;transition:var(--transition-bounce);box-shadow:var(--shadow-md)}.hero-cta:hover{transform:translateY(-3px) scale(1.05);box-shadow:var(--shadow-lg)}.categories{margin:4rem 0}.categories h2{text-align:center;font-size:2.5rem;margin-bottom:3rem;background:var(--accent-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.category-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem;margin:2rem 0}.category-card{display:block;text-decoration:none;color:inherit;background:var(--bg-glass);border:1px solid var(--color-border);border-radius:var(--border-radius);padding:2rem;transition:var(--transition);position:relative;overflow:hidden;cursor:pointer;will-change:transform;box-shadow:var(--shadow-sm)}.category-card:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:var(--primary-gradient);opacity:0;transition:var(--transition);z-index:-1}.category-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg);border-color:var(--color-border-hover)}.category-card:hover:before{opacity:var(--opacity-glass)}.category-card:nth-child(2):before{background:var(--secondary-gradient)}.category-card:nth-child(3):before{background:var(--accent-gradient)}.category-card:nth-child(4):before{background:var(--success-gradient)}.category-icon{font-size:3rem;margin-bottom:1rem;display:block;text-align:center;will-change:transform;animation:float 4s ease-in-out infinite}.category-card:nth-child(2) .category-icon{animation-delay:-1s}.category-card:nth-child(3) .category-icon{animation-delay:-2s}.category-card:nth-child(4) .category-icon{animation-delay:-3s}@keyframes float{0%,to{transform:translateZ(0)}50%{transform:translate3d(0,-8px,0)}}.category-card h3{font-size:1.5rem;margin-bottom:1rem;text-align:center;font-weight:600}.category-card p{color:var(--text-muted);text-align:center;margin-bottom:1.5rem}.simulation-preview{list-style:none;opacity:.8}.simulation-preview li{padding:.5rem 0;border-bottom:1px solid var(--color-border);font-size:.9rem;color:var(--text-secondary);transition:var(--transition)}.simulation-preview li:last-child{border-bottom:none}.category-card:hover .simulation-preview li{color:var(--text-primary);transform:translate(5px)}.features{margin:6rem 0;text-align:center}.features h2{font-size:2.5rem;margin-bottom:3rem;background:var(--success-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:2rem}.feature{padding:2rem;background:var(--bg-glass);border-radius:var(--border-radius);border:1px solid var(--color-border);transition:var(--transition);will-change:transform;box-shadow:var(--shadow-sm)}.feature:hover{transform:translateY(-5px);border-color:var(--color-border-hover)}.feature h3{margin-bottom:1rem;color:var(--text-primary)}.feature p{color:var(--text-muted)}.footer{text-align:center;padding:3rem 0;color:var(--text-muted);border-top:1px solid var(--color-border);margin-top:4rem}@media (max-width: 768px){.nav{padding:1rem}.main{padding:0 1rem}.hero{padding:2rem 0 4rem}.category-grid{grid-template-columns:1fr;gap:1.5rem}.category-card{padding:1.5rem}}@media (prefers-reduced-motion: reduce){*{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}.category-card:focus{outline:2px solid var(--color-focus);outline-offset:4px}.lang-toggle:focus{outline:2px solid var(--color-focus);outline-offset:2px}