:root{font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:#f6f7fb;color:#1f2937}body{margin:0}.container{max-width:860px;margin:24px auto;padding:0 16px 40px}.card{background:#fff;border:1px solid #e5e7eb;border-radius:12px;padding:16px;margin-bottom:14px}.hint{color:#6b7280;margin-bottom:20px}.grid2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}input,textarea,button{font:inherit}input,textarea{width:100%;box-sizing:border-box;border:1px solid #d1d5db;border-radius:8px;padding:9px;margin-bottom:10px}textarea{min-height:88px}button{border:0;border-radius:8px;padding:10px 14px;background:#2563eb;color:#fff;cursor:pointer}button[disabled]{background:#93c5fd;cursor:not-allowed}.ghost{background:transparent;color:#374151;border:1px solid #d1d5db}.message{font-weight:600}.chat-card{padding-bottom:12px}.chat-header{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:12px}.chat-header h2{margin:0}.chat-actions{display:flex;gap:8px}.chat-log{display:flex;flex-direction:column;gap:10px;height:58vh;overflow-y:auto;border:1px solid #e5e7eb;border-radius:10px;padding:12px;background:#f9fafb}.bubble{max-width:82%;border-radius:12px;padding:10px 12px;line-height:1.5}.bubble p{margin:0;white-space:pre-wrap}.bubble.assistant{background:#fff;border:1px solid #e5e7eb;align-self:flex-start}.bubble.user{background:#2563eb;color:#fff;align-self:flex-end}.composer{margin-top:12px}.composer textarea{min-height:92px;margin-bottom:8px}.composer button{width:100%}