html,body{color:#111827;background:#f8fafc;min-height:100%;margin:0;padding:0;font-family:Arial,Helvetica,sans-serif}*{box-sizing:border-box}.chat-panel{background:#fff;border:1px solid #e5e7eb;border-radius:16px;flex-direction:column;gap:16px;width:100%;max-width:900px;min-height:680px;padding:16px;display:flex;box-shadow:0 10px 30px #0000000f}.chat-messages{background:#f9fafb;border:1px solid #eef2f7;border-radius:12px;flex:1;padding:16px;overflow-y:auto}.empty-state{color:#6b7280}.message{white-space:pre-wrap;border-radius:12px;margin-bottom:16px;padding:12px}.message.user{background:#dbeafe}.message.assistant{background:#fff;border:1px solid #e5e7eb}.message p{margin:8px 0 0}.chat-input-row{gap:12px;display:flex}.chat-input-row textarea{resize:vertical;border:1px solid #d1d5db;border-radius:12px;flex:1;padding:12px;font-size:15px}.chat-input-row button{color:#fff;cursor:pointer;background:#111827;border:none;border-radius:12px;min-width:120px;font-weight:700}.chat-input-row button:disabled{opacity:.5;cursor:not-allowed}