:root{--background:#f7f8fb;--foreground:#1f2937;--muted:#667085;--border:#d7dce5;--surface:#ffffff;--surface-subtle:#eef2f7;--accent:#2f6f73;--accent-strong:#23585b;--danger:#a33b3b}*{box-sizing:border-box}body,html{min-height:100%}body{margin:0;background:var(--background);color:var(--foreground);font-family:Arial,Helvetica,sans-serif;font-size:14px}a{color:inherit;text-decoration:none}.app-shell{min-height:100vh;display:grid;grid-template-columns:236px minmax(0,1fr)}.sidebar{border-right:1px solid var(--border);background:var(--surface);padding:20px 16px}.brand{display:flex;flex-direction:column;gap:2px;margin-bottom:28px}.brand-title{font-size:18px;font-weight:700}.brand-subtitle{color:var(--muted);font-size:12px}.nav{display:grid;grid-gap:4px;gap:4px}.nav-button,.nav-link{border-radius:6px;color:var(--foreground);display:flex;align-items:center;min-height:36px;padding:8px 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