:root{--background:#f5f7fb;--surface:#ffffff;--surface-muted:#eef2f8;--border:#d9e0eb;--text:#142033;--muted:#5d6b80;--accent:#3157d5;--accent-dark:#233fa3;--success:#16704c;--danger:#b33a46;--shadow:0 20px 60px rgba(21,38,70,0.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--background);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button{cursor:pointer}.site-shell{min-height:100vh}.topbar{border-bottom:1px solid var(--border);background:rgba(255,255,255,.88);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);position:-webkit-sticky;position:sticky;top:0;z-index:10}.topbar-inner{max-width:1180px;margin:0 auto;padding:15px 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