:root{--bg-primary:#FFFFFF;--bg-secondary:#F8FAFC;--bg-surface:#FFFFFF;--bg-surface-hover:#F1F5F9;--border-color:#E2E8F0;--border-color-hover:#CBD5E1;--text-main:#0F172A;--text-muted:#475569;--text-dim:#64748B;--accent-blue:#2563EB;--accent-blue-hover:#1D4ED8;--accent-green:#059669;--accent-yellow:#D97706;--accent-red:#DC2626;--font-main:-apple-system,BlinkMacSystemFont,"Inter","Segoe UI",Roboto,sans-serif;--space-2:16px;--space-4:32px;--space-6:48px;--space-8:64px;--space-12:96px;--space-16:128px}*,:after,:before{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font-main);background-color:var(--bg-primary);color:var(--text-main);line-height:1.6;overflow-x:hidden;font-size:14px}a{color:inherit;text-decoration:none}ul{list-style:none}header{position:-webkit-sticky;position:sticky;top:0;z-index:100;background-color:#FFFFFF;border-bottom:1px solid var(--border-color)}.nav-container{max-width:1240px;margin:0 auto;padding:16px 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