:root{--ink:#172b4d;--muted:#52647d;--blue:#245fe6;--line:#dce4ef;--surface:#fff;--bg:#f5f7fb;--green:#087848;--red:#b42332}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}a{color:var(--blue);text-underline-offset:4px}button,input,textarea,select{font:inherit}button,a,input,textarea,select{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default;opacity:.65}a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #174cc4;outline-offset:4px}.learn-header{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:16px max(20px,calc((100% - 960px)/2));padding-top:max(16px,env(safe-area-inset-top));border-bottom:1px solid var(--line);background:var(--surface)}.learn-header>a{font-weight:750;color:var(--ink)}.learn-header 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