:root{--primary: #2563eb;--primary-dark: #1e40af;--accent: #06b6d4;--text-main: #0f172a;--text-muted: #475569;--text-faint: #64748b;--bg-main: #ffffff;--bg-soft: #f8fafc;--border-soft: #e5e7eb;--radius-lg: 24px;--radius-md: 16px;--shadow-soft: 0 30px 80px rgba(2, 6, 23, .08);--gradient: linear-gradient(135deg, var(--primary), var(--accent))}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg-main);color:var(--text-main);line-height:1.6;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}.site-header{position:sticky;top:0;z-index:100;background:#ffffffe6;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border-soft)}.nav{max-width:1200px;margin:0 auto;padding:16px 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