*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--bg);color:var(--text);font-family:var(--font)}button,input,select,textarea{font:inherit}.app-shell{min-height:100vh;display:grid;grid-template-columns:250px 1fr}.sidebar{background:var(--sidebar);border-right:1px solid var(--border);padding:24px}.brand{font-size:1.3rem;font-weight:800;margin-bottom:32px}.brand span{color:var(--accent)}nav{display:grid;gap:8px}.nav-item{border:1px solid transparent;background:transparent;color:var(--muted);padding:12px 14px;text-align:left;border-radius:10px;cursor:pointer}.nav-item:hover,.nav-item.active{color:var(--text);background:var(--surface-2);border-color:var(--border)}.main-content{min-width:0}.topbar{display:flex;align-items:center;justify-content:space-between;padding:24px 30px;border-bottom:1px solid var(--border)}h1{margin:2px 0 0}.eyebrow{margin:0;color:var(--accent);font-size:.72rem;letter-spacing:.16em}.content{padding:30px}