:root{--chat-bg:#181a20;--chat-bubble-user:#007aff;--chat-bubble-assistant:#23262f;--chat-bubble-user-text:#fff;--chat-bubble-assistant-text:#e5e5ea;--chat-input-bg:#23262f;--chat-input-text:#fff;--chat-border:#23262f;--chat-error:#ff4d4f;--chat-loading:#aaa}.chat-main{height:100vh;display:flex;flex-direction:column;background:var(--chat-bg)}.chat-messages{flex:1;overflow-y:auto;padding:16px;margin-bottom:8px}.chat-row{display:flex;margin:8px 0;align-items:flex-end}.chat-row-user{justify-content:flex-end}.chat-row-assistant{justify-content:flex-start}.chat-bubble{border-radius:16px;padding:10px 16px;max-width:70%;box-shadow:0 1px 2px rgba(0,0,0,.08);font-size:16px;word-break:break-word}.chat-bubble-user{background:var(--chat-bubble-user);color:var(--chat-bubble-user-text)}.chat-bubble-assistant{background:var(--chat-bubble-assistant);color:var(--chat-bubble-assistant-text)}.chat-loading{text-align:center;color:var(--chat-loading)}.chat-error{color:var(--chat-error);text-align:center}.chat-form{display:flex;padding:12px;border-top:1px solid var(--chat-border);background:var(--chat-bg)}.chat-input{flex:1;padding:10px 16px;outline:none;background:var(--chat-input-bg);color:var(--chat-input-text);margin-right:8px}.chat-input,.chat-send-btn{border:none;border-radius:20px;font-size:16px}.chat-send-btn{background:var(--chat-bubble-user);color:#fff;padding:10px 20px;cursor:pointer;transition:background .2s}.chat-send-btn:disabled{background:#444;cursor:not-allowed}.chat-avatar{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:20px;margin:0 8px;background:#23262f;color:#fff}.chat-avatar-user{background:#007aff}.chat-avatar-assistant{background:#23262f}