:root{--bg-primary:#fff;--bg-secondary:#f8fafc;--bg-card:#fff;--text-primary:#0f172a;--text-secondary:#475569;--text-muted:#94a3b8;--accent:#0891b2;--accent-light:#06b6d4;--accent-dark:#0e7490;--accent-glow:rgba(8,145,178,.2);--border:#e2e8f0;--border-light:#f1f5f9;--border-accent:rgba(8,145,178,.3);--success:#10b981}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-height:100vh;font-family:'Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif;color:var(--text-primary);line-height:1.7;background:var(--bg-primary);-webkit-font-smoothing:antialiased;background-image:linear-gradient(rgba(8,145,178,.025) 1px,transparent 1px),linear-gradient(90deg,rgba(8,145,178,.025) 1px,transparent 1px),radial-gradient(ellipse 100% 80% at 50% -30%,rgba(8,145,178,.08),transparent 60%);background-size:80px 80px,80px 80px,auto}a{color:inherit}.shell{position:relative;z-index:1;max-width:1100px;margin:0 auto;padding:72px 48px 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