*{box-sizing:border-box}html,body{background:#fff;height:100%;margin:0;padding:0;font-family:Arial,sans-serif}:root{--primary-color:#6366f1;--user-bg:#4f46e5;--assistant-bg:#f1f5f9;--assistant-text:#111827;--border-color:#e5e7eb}.chat-container{background:#fff;flex-direction:column;width:100%;height:100%;display:flex;overflow:hidden}.chat-header{background:var(--primary-color);color:#fff;flex-shrink:0;justify-content:space-between;align-items:center;height:56px;padding:0 16px;display:flex}.chat-title{font-size:16px;font-weight:600}.chat-box{background:#f8fafc;flex:1;padding:12px;overflow-y:auto}.chat-box::-webkit-scrollbar{width:6px}.chat-box::-webkit-scrollbar-thumb{background:#c7d2fe;border-radius:10px}.chat-bubble{word-wrap:break-word;border-radius:14px;max-width:80%;margin-bottom:10px;padding:10px 12px;font-size:14px;line-height:1.45}.chat-bubble.user{background:var(--user-bg);color:#fff;border-bottom-right-radius:4px;margin-left:auto}.chat-bubble.assistant{background:var(--assistant-bg);color:var(--assistant-text);border-bottom-left-radius:4px;margin-right:auto}.chat-link{color:var(--primary-color);font-weight:500;text-decoration:underline}.chat-link:hover{opacity:.9}.chat-input{border-top:1px solid var(--border-color);background:#fff;gap:10px;padding:12px;display:flex}.chat-input textarea{resize:none;border:1px solid #d1d5db;border-radius:8px;outline:none;flex:1;height:42px;padding:10px;font-size:14px}.chat-input textarea:focus{border-color:var(--primary-color)}.chat-input textarea::placeholder{color:#9ca3af}.chat-input button{background:var(--primary-color);color:#fff;cursor:pointer;border:none;border-radius:8px;min-width:90px;font-weight:600}.chat-input button:disabled{opacity:.6;cursor:not-allowed}.chat-bubble.assistant.loading{opacity:.7;font-style:italic}@media (max-width:640px){.chat-header{height:52px;padding:0 12px}.chat-title{font-size:14px}.chat-box{padding:10px}.chat-bubble{max-width:90%;font-size:13px}.chat-input{padding:10px}.chat-input textarea{height:38px;font-size:13px}.chat-input button{min-width:72px;font-size:13px}}