.main-layout{display:flex;gap:20px;max-width:1600px;margin:20px auto}.left-column{width:260px}.center-column{flex:1}.right-column{width:320px}.panel{background:#242424;color:#eee;padding:16px;border-radius:12px}body{background:#121212;font-family:Arial}a{color:#f90;text-decoration:none;display:block;padding:8px}