:root{--bg:#f6f7f9;--panel:#ffffff;--text:#172033;--muted:#667085;--border:#d9dee7;--brand:#0f766e;--brand-dark:#115e59;--accent:#c2410c;--danger:#b42318;--success:#027a48;--warning:#b54708;--shadow:0 1px 2px rgba(16,24,40,0.06)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Arial,Helvetica,sans-serif}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}.app-shell{min-height:100vh}.topbar{position:-webkit-sticky;position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 24px;background:#ffffff;border-bottom:1px solid var(--border)}.brand{display:flex;flex-direction:column;gap:2px;font-weight:700}.brand small{color:var(--muted);font-weight:400}.nav{display:flex;gap:8px;flex-wrap:wrap}.link-button,.nav a{border:1px solid transparent;border-radius:6px;padding:8px 10px;color:var(--muted);background:transparent;cursor:pointer}.link-button:hover,.nav 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