:root{--text:#172033;--muted:#5d6678;--line:#e6ebef;--blue:#1769c2;--ink:#11384f;--green:#527c6f;--gold:#e9c966;--orange:#df8f67;--soft:#f6f8fa}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",Arial,sans-serif;color:var(--text);background:#fff;line-height:1.72}a{color:inherit;text-decoration:none}.site-header{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:22px;padding:14px clamp(18px,4vw,56px);border-bottom:1px solid var(--line);background:rgba(255,255,255,.96);backdrop-filter:saturate(180%) blur(12px)}.brand{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--ink);min-width:150px}.brand img{width:40px;height:40px;object-fit:contain}.brand span{font-size:18px;white-space:nowrap}.site-header nav,footer nav{display:flex;gap:16px;flex-wrap:wrap;font-size:15px}.site-header nav a{color:#26364d}.site-header nav a:hover,.site-header 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