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transparent}.opt-row.correct{border-color:#86efac;background:#f0fdf4}.opt-row .badge{white-space:nowrap}.opt-row input[type=radio]{width:18px;height:18px;accent-color:var(--green);flex-shrink:0}.preview-box{border:1px solid var(--border);border-radius:12px;min-height:260px;display:grid;place-items:center;background:var(--gray-s);overflow:hidden;margin-top:12px}.preview-box img{max-width:100%;max-height:60vh}.preview-box iframe{width:100%;height:60vh;border:0}.score-input{max-width:120px;text-align:center}.ans-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(64px,1fr));gap:6px;margin-top:10px}.ans-cell{border-radius:8px;padding:6px;text-align:center;font-size:12px}.clickable-row{cursor:pointer}.clickable-row:hover td{background:#f5f9ff}.opt{border:1px solid var(--border);border-radius:12px;padding:18px;background:#fff;text-align:right}.opt.on{border:2px solid var(--primary);background:#eef4ff}.qgrid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}.qgrid button{border:1px solid var(--border);background:#fff;border-radius:8px;padding:10px 0}.qgrid .done{background:#22a05b;color:#fff;border:0}.qgrid .cur{background:var(--primary);color:#fff;border:0}.chat{display:flex;flex-direction:column;min-height:560px}.msgs{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:14px;padding:16px;max-height:60vh}.msg{max-width:75%;padding:14px 18px;border-radius:14px;line-height:1.9}.msg.me{background:#e8f0ff;align-self:flex-start}.msg.bot{background:#fff;border:1px solid var(--border);align-self:flex-end}.hist a{display:block;padding:12px;border-radius:10px}.hist a:hover,.hist a.on{background:#eef4ff}