:root{--blue:#0071e3;--blue-hover:#0077ed;--bg:#fbfbfd;--card:#fff;--text:#1d1d1f;--text-2:#6e6e73;--border:#e8e8ed;--radius:18px;--shadow:0 4px 24px rgba(0,0,0,.06);--shadow-lg:0 12px 40px rgba(0,0,0,.1)}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,SF Pro Text,SF Pro Display,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Segoe UI,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}.container{max-width:1080px;margin:0 auto;padding:0 20px}.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:50;background:rgba(251,251,253,.8);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid var(--border)}.header-inner{gap:24px;height:60px;max-width:1080px;margin:0 auto;padding:0 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