:root{--bg:#f7f9fc;--bg-elevated:#fff;--bg-card:#fff;--border:#e4eaf2;--border-strong:#cbd7e6;--text:#0e1a2b;--text-muted:#5b6b80;--accent:#2f74f0;--accent-strong:#1e5fd6;--accent-soft:rgba(47,116,240,.09);--success:#2f9e44;--radius:12px;--radius-lg:20px;--font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body,html{padding:0;margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:16px;line-height:1.6}a{color:inherit;text-decoration:none}img{max-width:100%}.container{width:100%;max-width:1120px;margin:0 auto;padding:0 24px}.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:50;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:hsla(0,0%,100%,.85);border-bottom:1px solid 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