:root{--primary: #2563EB;--primary-light: #3b82f6;--primary-dark: #1d4ed8;--bg-light: #D6E3FF;--bg-white: #ffffff;--text-dark: #1E293B;--text-muted: #64748B;--text-muted2: #94a3b8;--border: rgba(30, 41, 59, .12);--radius: 12px;--radius2: 16px;--max: 1120px;--pad: 20px;--font: ui-sans-serif, system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji"}*{box-sizing:border-box}html,body{height:100%}body{margin:0;font-family:var(--font);color:var(--text-dark);background:var(--bg-white)}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.container{width:100%;max-width:var(--max);margin:0 auto;padding:0 var(--pad)}.topbar{position:sticky;top:0;z-index:40;background:var(--bg-white);border-bottom:1px solid var(--border);box-shadow:0 1px 3px 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