:root{--bg:#f6f7f9;--surface:#ffffff;--border:#e3e6ea;--text:#1a1d21;--muted:#6b7280;--primary:#1f5eff;--primary-dark:#1848c7;--green:#0f9d58;--green-bg:#e7f6ee;--amber:#b26a00;--amber-bg:#fdf3e2;--red:#c62828;--red-bg:#fdeaea;--blue:#1f5eff;--blue-bg:#e8effe;--gray:#5f6773;--gray-bg:#eef0f3;--radius:10px;--shadow:0 1px 2px rgba(16,24,40,.06),0 1px 3px rgba(16,24,40,.1)}*{box-sizing:border-box}body,html{padding:0;margin:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Sarabun,Noto Sans Thai,Tahoma,sans-serif;font-size:15px;line-height:1.55}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}h1{font-size:22px;margin:0 0 4px}h2{font-size:17px;margin:0 0 12px}h3{font-size:15px;margin:0 0 8px}.shell{display:flex;min-height:100vh}.sidebar{width:220px;background:var(--surface);border-right:1px solid var(--border);padding:16px 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