:root{--primary-color:#4a6de5;--secondary-color:#2c3e50;--accent-color:#e74c3c;--light-color:#ecf0f1;--dark-color:#2c3e50;--text-color:#333;--text-light:#777;--border-radius:4px;--box-shadow:0 2px 5px #0000001a}*{box-sizing:border-box;margin:0;padding:0}body{color:var(--text-color);background-color:#fff;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;line-height:1.6}a{color:var(--primary-color);text-decoration:none;transition:color .3s}a:hover{color:var(--accent-color)}.container{width:90%;max-width:1200px;margin:0 auto;padding:0 20px}header{box-shadow:var(--box-shadow);z-index:1000;background-color:#fff;width:100%;position:fixed;top:0}nav{justify-content:space-between;align-items:center;padding:20px 0;display:flex}.logo{color:var(--dark-color);font-size:24px;font-weight:700}.logo span{color:var(--primary-color)}.nav-links{list-style:none;display:flex}.nav-links li{margin-left:30px}.nav-links a{font-weight:500}.hamburger{cursor:pointer;display:none}.hero{text-align:center;background:linear-gradient(135deg,#f5f7fa 0%,#e4e8f0 100%);padding:160px 0 100px}.hero h1{color:var(--dark-color);margin-bottom:20px;font-size:2.5rem}.hero p{color:var(--text-light);max-width:700px;margin:0 auto 40px;font-size:1.2rem}.cta-button{background-color:var(--primary-color);color:#fff;border-radius:var(--border-radius);padding:12px 30px;font-weight:600;transition:background-color .3s;display:inline-block}.cta-button:hover{color:#fff;background-color:#3a5bd4}.extensions{padding:100px 0}.section-header{text-align:center;margin-bottom:60px}.section-header h2{color:var(--dark-color);margin-bottom:15px;font-size:2.2rem}.section-header p{color:var(--text-light);max-width:700px;margin:0 auto}.extension-card{border-radius:var(--border-radius);box-shadow:var(--box-shadow);background-color:#fff;margin-bottom:30px;transition:transform .3s,box-shadow .3s;overflow:hidden}.extension-card:hover{transform:translateY(-5px);box-shadow:0 5px 15px #0000001a}.extension-img{border-radius:var(--border-radius)var(--border-radius)0 0;width:100%;max-width:800px;height:auto;margin:0 auto;transition:transform .3s;display:block}.extension-card:hover .extension-img{transform:scale(1.02)}.extension-content{padding:30px}.extension-content h3{color:var(--dark-color);margin-bottom:15px;font-size:1.5rem}.extension-content p{color:var(--text-light);margin-bottom:20px}.features-list{margin-bottom:25px;list-style:none}.features-list li{margin-bottom:10px;padding-left:25px;position:relative}.features-list li:before{content:"✓";color:var(--primary-color);position:absolute;left:0}.testimonial{background-color:var(--light-color);border-radius:var(--border-radius);margin:30px 0;padding:20px;position:relative}.testimonial p{margin-bottom:10px;font-style:italic}.testimonial-author{text-align:right;font-weight:600}.extension-links{margin-top:20px}.extension-links a{margin-right:15px;font-weight:500;display:inline-block}.optimization{background-color:var(--light-color);padding:100px 0}.optimization-grid{grid-template-columns:repeat(3,1fr);gap:30px;margin-top:50px;display:grid}.optimization-item{border-radius:var(--border-radius);box-shadow:var(--box-shadow);text-align:center;background-color:#fff;padding:30px}.optimization-icon{color:var(--primary-color);margin-bottom:20px}.optimization-item h3{color:var(--dark-color);margin-bottom:15px}footer{background-color:var(--dark-color);color:#fff;padding:70px 0 20px}.footer-grid{grid-template-columns:1fr;gap:30px;margin-bottom:50px;display:grid}.footer-column{padding:0 15px}.footer-column h3{color:#fff;margin-bottom:20px;font-size:1.2rem}.footer-links{list-style:none}.footer-links li{margin-bottom:10px}.footer-links a{color:#bdc3c7;transition:color .3s}.footer-links a:hover{color:#fff}.social-icons{margin-top:20px;display:flex}.social-icons a{color:#fff;background-color:#ffffff1a;border-radius:50%;justify-content:center;align-items:center;width:40px;height:40px;margin-right:10px;transition:background-color .3s;display:inline-flex}.social-icons a:hover{background-color:var(--primary-color)}.footer-bottom{text-align:center;color:#bdc3c7;border-top:1px solid #ffffff1a;padding-top:20px;font-size:.9rem}.page-content{padding:160px 0 100px}.page-content h1{margin-bottom:30px}.page-content h2{margin:30px 0 15px}.page-content p{margin-bottom:15px}.page-content ul{margin-bottom:15px;padding-left:20px}.error-page{text-align:center;padding:160px 0 100px}.error-page h1{color:var(--primary-color);margin-bottom:20px;font-size:6rem}.error-page p{margin-bottom:30px;font-size:1.2rem}@media (max-width:992px){.optimization-grid,.footer-grid{grid-template-columns:repeat(2,1fr)}}@media (max-width:768px){.hero{padding:130px 0 80px}.hero h1{font-size:2rem}.nav-links{background-color:#fff;flex-direction:column;align-items:center;width:100%;height:calc(100vh - 80px);padding-top:40px;transition:left .3s;position:fixed;top:80px;left:-100%}.nav-links.active{left:0}.nav-links li{margin:15px 0}.hamburger{display:block}.optimization-grid{grid-template-columns:1fr}}@media (max-width:576px){.footer-grid{grid-template-columns:1fr}.hero h1,.section-header h2{font-size:1.8rem}}