:root{--primary-color:#4a90e2;--secondary-color:#7b68ee;--accent-color:#50c878;--dark-blue:#2c3e50;--light-blue:#ecf4ff;--text-dark:#2c3e50;--text-light:#6c757d;--white:#ffffff;--light-gray:#f8f9fa;--border-color:#e9ecef;--shadow:0 2px 10px rgba(0, 0, 0, 0.1);--border-radius:8px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:inter,-apple-system,BlinkMacSystemFont,segoe ui,Roboto,sans-serif;line-height:1.6;color:var(--text-dark);background-color:var(--white)}.header{background:var(--white);box-shadow:var(--shadow);position:sticky;top:0;z-index:100}.nav-container{max-width:1200px;margin:0 auto;padding:0 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