:root{--accent:#f97316;--accent-dark:#c2410c;--blue:#2563eb;--green:#047857;--ink:#17202a;--muted:#5d6b7c;--soft:#7b8794;--line:#e0e6ee;--page:#f6f7f9;--surface:#ffffff;--surface-soft:#fbfcfe;--shadow:0 14px 34px rgba(23,32,42,0.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--page);font-family:"Microsoft YaHei","微软雅黑",system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.6;letter-spacing:0}a{color:inherit}.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,0.94);border-bottom:1px solid var(--line);backdrop-filter:blur(10px)}.nav-wrap{width:min(1120px,calc(100% - 32px));min-height:64px;margin:0 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