:root{--bg: #f8fafc;--surface: #ffffff;--text: #0f172a;--muted: #64748b;--border: #e2e8f0;--xunzong: #0d9488;--xunzong-dark: #0f766e;--xunzong-light: #ccfbf1;--jiankang: #2563eb;--jiankang-dark: #1d4ed8;--jiankang-light: #c2e7d3;--hero-bg: #0f172a;--radius: 16px;--shadow: 0 4px 24px rgba(15, 23, 42, .08);--shadow-lg: 0 20px 50px rgba(15, 23, 42, .12)}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Helvetica Neue,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.container{width:min(1120px,100% - 48px);margin:0 auto}.site-header{position:sticky;top:0;z-index:100;background:#ffffffeb;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid 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