*{box-sizing:border-box;margin:0;padding:0}:root{--accent: #0096fa;--accent-dark: #0078d4;--bg: #f6f7f9;--panel: #ffffff;--border: #e8eaed;--text: #2f3437;--text-sub: #6f767c;--text-faint: #9aa1a6;--radius: 8px;--shadow: 0 1px 3px rgba(0, 0, 0, .08)}html,body{height:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Noto Sans CJK SC,Noto Sans,sans-serif;background:var(--bg);color:var(--text);font-size:14px}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-dark)}.site-header{position:sticky;top:0;z-index:50;background:var(--panel);border-bottom:1px solid var(--border);box-shadow:0 1px 4px #0000000a}.header-inner{max-width:1440px;margin:0 auto;padding:10px 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