:root{--bg:#f6f7f9;--surface:#ffffff;--border:#e3e6ea;--border-strong:#cfd4da;--text:#1c2024;--text-mute:#6b7280;--text-faint:#9aa1a9;--accent:#0f766e;--accent-hover:#0d635c;--accent-soft:#e6f4f2;--danger:#b42318;--danger-soft:#fef3f2;--warn:#b54708;--warn-soft:#fffaeb;--ok:#067647;--ok-soft:#ecfdf3;--radius:6px;--shadow:0 1px 2px rgba(16,24,40,0.06),0 1px 3px rgba(16,24,40,0.1);--shadow-lg:0 8px 24px rgba(16,24,40,0.12);--nav-w:208px;--header-h:52px}*{box-sizing:border-box}body,html{margin:0;padding:0}body{background:var(--bg);color:var(--text);font:14px/1.55 -apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,Helvetica Neue,Arial,sans-serif;-webkit-font-smoothing:antialiased}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.shell{min-height:100vh}.nav,.shell{display:flex}.nav{width:var(--nav-w);flex:0 0 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