.reasoning-card{margin:10px 0;border:1px solid #34566b;border-radius:12px;background:linear-gradient(135deg,#111b23,#0c1117);overflow:hidden}.reasoning-card summary{display:flex;justify-content:space-between;align-items:center;cursor:pointer;padding:13px 15px;color:#c9e9fa;font-size:13px;font-weight:650}.expand-hint{font-size:11px;font-weight:400;color:#7fa2b5}.reasoning-card[open] .expand-hint{font-size:0}.reasoning-card[open] .expand-hint::after{content:'收起';font-size:11px}.reasoning-body{border-top:1px solid #263d4b;padding:14px 16px;color:#c4cfda;font-size:13px;line-height:1.7;white-space:pre-wrap;word-break:break-word;max-height:520px;overflow:auto}.attachments{margin-top:14px}.attachment-heading{font-size:12px;color:var(--muted);margin-bottom:8px}.attachment-card{display:flex;gap:12px;align-items:center;border:1px solid var(--line);border-radius:12px;background:var(--panel);padding:10px;margin-top:8px}.attachment-preview{width:92px;height:68px;object-fit:cover;border-radius:8px;border:1px solid var(--line);display:block}.attachment-info{display:flex;flex-direction:column;gap:5px;min-width:0;flex:1}.attachment-info strong{font-size:13px}.attachment-info span{font-size:11px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.attachment-actions{display:flex;gap:8px;white-space:nowrap}.attachment-actions a,.attachment-actions button{border:1px solid #345946;border-radius:8px;background:#10241b;color:var(--accent);padding:7px 10px;text-decoration:none;cursor:pointer;font-size:12px}.attachment-actions button:disabled{opacity:.65}@media(max-width:800px){.attachment-card{align-items:flex-start;flex-wrap:wrap}.attachment-actions{width:100%}}