:root{--bg:#fff;--deep:#F5F7FA;--panel:#fff;--muted:#EEF1F6;--title:#0A1628;--text:#1E2A3A;--secondary:#4A5568;--aux:#718096;--blue:#0033A0;--bright:#0052CC;--navy:#002066;--border:rgba(0,51,160,.14);--shadow:0 12px 36px rgba(0,33,102,.08);--max:1220px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.75;overflow-x:hidden}a{color:inherit;text-decoration:none}button,input{font:inherit}.wrap{width:min(var(--max),calc(100% - 32px));margin:0 auto}.site-header{position:fixed;top:0;left:0;right:0;z-index:90;background:#fff}.spine{height:18px;background:var(--navy);color:#fff;font-size:11px;line-height:18px}.spine-inner{display:flex;justify-content:space-between;align-items:center}.text-btn{border:0;background:transparent;color:#fff;padding:0 6px;cursor:pointer}.coverbar{height:60px;border-bottom:1px solid 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