:root{--brand: #217a60;--brand-light: #2a9673;--brand-pale: #eef6f2;--bg: #f6faf8;--surface: #ffffff;--ink: #16231f;--muted: #5b6b66;--line: #dbe7e2;--radius: 14px;--wrap: 1080px}*,*:before,*:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{margin:0;background:var(--surface);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}img{max-width:100%;display:block}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 24px}.nav{border-bottom:1px solid var(--line);background:#ffffffe6;position:sticky;top:0;z-index:10;-webkit-backdrop-filter:saturate(180%) blur(8px);backdrop-filter:saturate(180%) blur(8px)}.nav 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