:root{--bg:#f5f3ef;--surface:#fff;--ink:#151515;--muted:#6d6a64;--line:#d9d4ca;--line-strong:#1b1b1b;--accent:#d71920;--accent-dark:#9f1117;--track:#071426;--gold:#c69a2e}*{box-sizing:border-box}body{background:var(--bg);min-height:100vh;color:var(--ink);margin:0;font-family:Avenir Next,PingFang SC,Microsoft YaHei,sans-serif}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}.shell{width:min(1180px,100vw - 32px);margin:0 auto}.site-header{z-index:10;border-bottom:1px solid var(--line);backdrop-filter:blur(12px);background:#f5f3efeb;position:sticky;top:0}.site-header-inner{justify-content:space-between;align-items:center;gap:24px;height:72px;display:flex}.brand{letter-spacing:0;align-items:baseline;gap:10px;font-weight:900;display:flex}.brand-mark{color:var(--accent);font-size:24px;font-style:italic}.brand-sub{color:var(--muted);font-size:13px;font-weight:700}.nav{align-items:center;gap:4px;font-size:14px;font-weight:700;display:flex}.nav 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