:root{--brand-green:#1a7a6d;--brand-green-dark:#14594f;--brand-yellow:#f5c518;--text:#1a1a2e;--text-soft:#555;--bg:#fff;--bg-soft:#f4f7f6;--border:#e2e8e6;--radius:8px;--maxw:1080px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{color:var(--text);background:var(--bg);margin:0;font-family:Helvetica,Arial,PingFang SC,Microsoft YaHei,sans-serif;line-height:1.7}img{max-width:100%;height:auto}a{color:var(--brand-green)}a:hover{color:var(--brand-green-dark)}.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}.site-header{border-bottom:1px solid 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