:root{--blue:#0a3a9a;--blue2:#1559c7;--ink:#172033;--muted:#74809a;--line:#e7ebf3;--paper:#f5f7fb;--card:#fff;--accent:#ff5c5c}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}a{text-decoration:none;color:inherit}.app-shell{min-height:100vh}.topbar{height:58px;background:linear-gradient(110deg,#082f82,#1559c7);color:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 max(18px,calc((100% - 720px)/2 + 18px));position:sticky;top:0;z-index:10;box-shadow:0 4px 15px #0a3a9a33}.brand{display:flex;align-items:center;gap:9px;font-size:18px;font-weight:700}.brand-mark{width:30px;height:30px;display:grid;place-items:center;border-radius:9px;background:#fff;color:var(--blue);font-weight:800}.header-date{font-size:12px;opacity:.8}.page{max-width:720px;margin:auto;padding:18px 14px 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