:root{--primary-color: #2563eb;--secondary-color: #1e40af;--accent-color: #3b82f6;--text-primary: #1f2937;--text-secondary: #6b7280;--background: #ffffff;--surface: #f8fafc;--border: #e5e7eb;--shadow: 0 4px 6px -1px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;line-height:1.6;color:var(--text-primary);background-color:var(--background)}.container{max-width:1200px;margin:0 auto;padding:0 20px}.header{background:transparent;position:fixed;top:0;left:0;right:0;z-index:1000;transition:all .3s ease}.header.scrolled{background:#fffffff2;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 2px 20px #0000001a}.nav-container{max-width:1400px;margin:0 auto;padding:0 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