.sidebar{width:220px;background:#222;color:#fff;padding:1.5rem}.logo{font-size:1.2rem;margin-bottom:2rem}.sidebar nav{display:flex;flex-direction:column;gap:1rem}.sidebar a{color:#aaa;text-decoration:none}.sidebar a.active{color:#fff;font-weight:700}.layout{display:flex;height:100vh}.main-content{flex-grow:1;padding:2rem;background:#f7f8fa;overflow-y:auto}