.btn{padding:8px 14px;background:#2563eb;color:#fff;border:none;border-radius:4px;cursor:pointer}.card{border:1px solid #ddd;padding:16px;border-radius:6px;background:#fff}.input{padding:8px;width:100%;border:1px solid #ccc;border-radius:4px}.modal-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#0000004d}.modal{background:#fff;margin:100px auto;padding:20px;width:400px;border-radius:6px}.sidebar{width:200px;background:#f4f4f4;padding:16px}.navbar{background:#111827;color:#fff;padding:12px 16px}.table{width:100%;border-collapse:collapse}.table th,.table td{border:1px solid #ddd;padding:8px}.history-panel{padding:12px;border-top:1px solid #ddd}.history-item{margin-bottom:6px}.history-panel.error{color:red}