.bc-wrap{display:grid;grid-template-columns:260px minmax(420px,1fr) 300px;gap:18px;max-width:1420px;margin:25px auto;padding:0 16px;font-family:Arial,sans-serif;color:#172033}.bc-sidebar,.bc-stage-panel{background:#fff;border:1px solid #e3e7ef;border-radius:16px;box-shadow:0 8px 30px rgba(20,30,50,.06)}.bc-sidebar{padding:18px;max-height:calc(100vh - 50px);overflow:auto}.bc-sidebar h3{margin:0 0 14px;font-size:18px}.bc-balloon-list{display:grid;grid-template-columns:1fr 1fr;gap:10px}.bc-balloon-card{border:1px solid #dde3ee;background:#f8fafc;border-radius:12px;padding:10px;cursor:pointer;text-align:center}.bc-balloon-card.is-active{outline:3px solid #2b7cff;background:#eef5ff}.bc-balloon-card img{height:86px;object-fit:contain;display:block;margin:0 auto 8px}.bc-balloon-card span{font-size:12px}.bc-stage-panel{padding:18px}.bc-stage-toolbar{display:flex;align-items:center;gap:10px;justify-content:space-between;margin-bottom:12px}.bc-stage-toolbar button,.bc-primary{border:0;border-radius:10px;padding:10px 14px;cursor:pointer;background:#172033;color:#fff}.bc-stage-toolbar button{background:#eef2f7;color:#172033}.bc-stage{display:flex;align-items:center;justify-content:center;background:linear-gradient(180deg,#f8fbff,#edf3fb);border-radius:16px;min-height:620px;overflow:hidden}.bc-stage canvas{max-width:100%;height:auto;cursor:grab}.bc-stage canvas:active{cursor:grabbing}.bc-control-group{border-bottom:1px solid #eef2f7;padding-bottom:18px;margin-bottom:18px}.bc-control-group label{display:block;font-weight:700;font-size:13px;margin:12px 0 6px}.bc-control-group textarea,.bc-control-group select,.bc-control-group input[type=file]{width:100%;box-sizing:border-box;border:1px solid #dce3ec;border-radius:10px;padding:10px}.bc-control-group input[type=range]{width:100%}.bc-primary{width:100%;background:#2b7cff;font-weight:700}.bc-help{font-size:13px;line-height:1.4;color:#667085}.bc-preview-box{margin-top:16px;border:1px dashed #c9d3e2;border-radius:14px;padding:14px}.bc-preview-box img{max-width:180px;display:block;margin-bottom:10px}@media(max-width:1050px){.bc-wrap{grid-template-columns:1fr}.bc-sidebar{max-height:none}.bc-balloon-list{grid-template-columns:repeat(auto-fill,minmax(110px,1fr))}}