.hdn-chat-app{display:flex;height:100vh;width:100vw;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;position:fixed;top:0;left:0;z-index:99999;background:#fff}.hdn-chat-sidebar{width:260px;background:#fff;border-right:1px solid #f0f0f0;display:flex;flex-direction:column;padding:16px 12px;flex-shrink:0;box-sizing:border-box}.hdn-chat-logo{display:flex;align-items:center;gap:10px;padding:8px 12px 20px;font-size:18px;font-weight:700;color:#202124}.hdn-chat-logo-icon{width:32px;height:32px;border-radius:50%;background:linear-gradient(135deg,#e63946,#ff6b6b);display:flex;align-items:center;justify-content:center;color:#fff;font-size:13px;font-weight:700;flex-shrink:0}.hdn-chat-new-btn{display:flex;align-items:center;gap:10px;padding:10px 14px;border-radius:24px;border:1px solid #e0e0e0;background:#fff;cursor:pointer;font-size:14px;color:#202124;margin-bottom:8px;transition:background .15s;width:100%}.hdn-chat-new-btn:hover{background:#f8f8f8}.hdn-chat-search{display:flex;align-items:center;gap:8px;padding:10px 14px;border-radius:24px;color:#5f6368;font-size:14px;cursor:pointer}.hdn-chat-search:hover{background:#f8f8f8}.hdn-chat-sidebar-bottom{margin-top:auto;padding:12px 0}.hdn-chat-user{display:flex;align-items:center;gap:10px;padding:8px;border-radius:24px;cursor:pointer}.hdn-chat-user:hover{background:#f8f8f8}.hdn-chat-avatar{width:32px;height:32px;border-radius:50%;background:#e63946;color:#fff;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:600;flex-shrink:0}.hdn-chat-username{font-size:14px;color:#202124}.hdn-chat-main{flex:1;display:flex;flex-direction:column;background:#fff;position:relative;overflow:hidden}.hdn-chat-main:before{content:'';position:absolute;top:15%;left:50%;transform:translateX(-50%);width:600px;height:400px;background:radial-gradient(ellipse,rgba(169,203,255,.2),transparent 70%);pointer-events:none}.hdn-chat-empty{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:20px;position:relative;z-index:1}.hdn-chat-greeting{font-size:28px;font-weight:400;color:#202124;margin-bottom:32px;text-align:center}.hdn-chat-input-wrap{width:100%;max-width:720px;position:relative;z-index:1;margin:0 auto}.hdn-chat-input-box{display:flex;align-items:flex-end;background:#fff;border:1px solid #e0e0e0;border-radius:32px;padding:8px 8px 8px 20px;box-shadow:0 1px 3px rgba(0,0,0,.08);transition:box-shadow .2s}.hdn-chat-input-box:focus-within{box-shadow:0 2px 8px rgba(0,0,0,.12)}.hdn-chat-input-box textarea{flex:1;border:none;outline:none;resize:none;font-size:16px;font-family:inherit;max-height:120px;padding:8px 0;background:0 0;line-height:1.5}.hdn-chat-send{width:36px;height:36px;border-radius:50%;border:none;background:#e63946;color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .15s;padding:0}.hdn-chat-send:disabled{background:#dadce0;cursor:not-allowed}.hdn-chat-send svg{width:18px;height:18px}.hdn-chat-messages{flex:1;overflow-y:auto;padding:24px 20px;display:none;flex-direction:column;gap:16px}.hdn-chat-messages.active{display:flex}.hdn-chat-msg{max-width:720px;width:100%;margin:0 auto;line-height:1.6;font-size:15px}.hdn-chat-msg-user{text-align:right}.hdn-chat-msg-user .bubble{display:inline-block;background:#f1f3f4;border-radius:20px;padding:10px 18px;text-align:left;max-width:80%}.hdn-chat-msg-ai{color:#202124}.hdn-chat-msg-ai .bubble{white-space:pre-wrap}.hdn-chat-typing{display:inline-flex;gap:4px;padding:10px 0}.hdn-chat-typing i{width:8px;height:8px;border-radius:50%;background:#dadce0;animation:hdnBounce 1.2s infinite;display:inline-block}.hdn-chat-typing i:nth-child(2){animation-delay:.15s}.hdn-chat-typing i:nth-child(3){animation-delay:.3s}@keyframes hdnBounce{0%,60%,100%{transform:translateY(0)}30%{transform:translateY(-6px)}}.hdn-chat-bottom-input{padding:16px 20px 24px;display:none;position:relative;z-index:1}.hdn-chat-bottom-input.active{display:block}