:root{--primary-color: #2563eb;--secondary-color: #1e40af;--accent-color: #0ea5e9;--dark-color: #1e293b;--light-color: #f8fafc;--text-color: #334155;--gray-color: #64748b;--white: #ffffff;--shadow: 0 10px 30px rgba(0, 0, 0, .1);--shadow-lg: 0 20px 60px rgba(0, 0, 0, .15);--transition: all .3s ease}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;color:var(--text-color);background-color:var(--light-color);line-height:1.6}html,body{overflow-x:hidden}.container{max-width:1200px;margin:0 auto;padding:0 20px}section{padding:100px 0}.section-header{margin-bottom:60px;text-align:center}.section-title{font-size:42px;color:var(--dark-color)}.section-subtitle{font-size:18px;color:var(--gray-color)}.scroll-top{position:fixed;bottom:30px;right:30px;width:55px;height:55px;background:#005bff26;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:22px;color:var(--primary-color);cursor:pointer;opacity:0;visibility:hidden;transform:translateY(20px);box-shadow:var(--shadow);transition:var(--transition);z-index:999}.scroll-top.show{opacity:1;visibility:visible;transform:translateY(0)}.scroll-top:hover{transform:translateY(-5px);background:var(--primary-color);color:var(--white)}