:root{--primary-color: #18181b;--bg-color: #ffffff;--bg-secondary: #f4f4f5;--bg-page: #f0f0f3;--text-color: #18181b;--text-secondary: #71717a;--border-color: #e4e4e7;--message-guest-bg: var(--primary-color);--message-guest-text: #ffffff;--message-system-bg: #f4f4f5;--message-system-text: #18181b;--error-bg: #fef2f2;--error-text: #dc2626;--toast-bg: #18181b;--toast-text: #ffffff}[data-theme=dark]{--bg-color: #18181b;--bg-secondary: #27272a;--bg-page: #09090b;--text-color: #fafafa;--text-secondary: #a1a1aa;--border-color: #3f3f46;--message-system-bg: #27272a;--message-system-text: #fafafa;--error-bg: #450a0a;--error-text: #fca5a5;--toast-bg: #fafafa;--toast-text: #18181b}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:14px;line-height:1.5;color:var(--text-color);background-color:var(--bg-page)}#app{height:100%;display:flex;align-items:center;justify-content:center;padding:0}.chat-container{display:flex;flex-direction:column;width:100%;max-width:640px;height:100%;max-height:100vh;background-color:var(--bg-color);overflow:hidden}@media(min-width:640px){#app{padding:24px}.chat-container{max-height:90vh;border-radius:16px;box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -2px #0000001a}}.chat-header{flex-shrink:0;display:flex;align-items:center;justify-content:space-between;padding:12px 16px;background-color:var(--primary-color);color:#fff;border-bottom:1px solid var(--border-color)}.chat-title{flex:1;font-size:16px;font-weight:600;margin:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.lang-selector{position:relative;flex-shrink:0}.lang-button{display:flex;align-items:center;gap:6px;background:#ffffff1a;border:none;border-radius:8px;color:#fff;padding:6px 10px;cursor:pointer;font-size:13px;transition:background-color .2s}.lang-button:hover{background:#fff3}.lang-button svg{flex-shrink:0}.lang-label{white-space:nowrap}.lang-dropdown{position:absolute;top:100%;right:0;margin-top:4px;background-color:var(--bg-color);border:1px solid var(--border-color);border-radius:8px;box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -2px #0000001a;overflow:hidden;z-index:100;min-width:120px}.lang-option{display:block;width:100%;padding:8px 14px;text-align:left;background:none;border:none;color:var(--text-color);font-size:13px;cursor:pointer;transition:background-color .15s}.lang-option:hover{background-color:var(--bg-secondary)}.lang-option.active{font-weight:600;color:var(--primary-color)}.message-list-container{flex:1;overflow:hidden;display:flex;flex-direction:column}.message-list{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:12px}.message{max-width:85%;animation:messageSlideIn .2s ease-out}@keyframes messageSlideIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.message-content{padding:10px 14px;border-radius:16px;word-wrap:break-word;overflow-wrap:break-word;white-space:pre-wrap}.message-content a{color:inherit;text-decoration:underline}.message-content a:hover{opacity:.8}.message-timestamp{font-size:11px;color:var(--text-secondary);margin-top:4px;padding:0 4px}.message-guest{align-self:flex-end}.message-guest .message-content{background-color:var(--message-guest-bg);color:var(--message-guest-text);border-bottom-right-radius:4px}.message-guest .message-timestamp{text-align:right}.message-operator,.message-ai{align-self:flex-start}.message-operator .message-content,.message-ai .message-content{background-color:var(--message-system-bg);color:var(--message-system-text);border-bottom-left-radius:4px}.message-system{align-self:center;max-width:90%}.message-system .message-content{background-color:var(--bg-secondary);color:var(--text-secondary);text-align:center;font-size:13px}.message-system .message-timestamp{display:none}.privacy-notice{display:block;margin-top:6px;font-size:11px}.privacy-notice a{color:inherit;text-decoration:underline}.privacy-notice a:hover{opacity:.7}.loading-indicator{display:flex;align-items:center;gap:4px;padding:10px 14px;background-color:var(--message-system-bg);border-radius:16px 16px 16px 4px;align-self:flex-start;max-width:60px}.loading-dot{width:8px;height:8px;background-color:var(--text-secondary);border-radius:50%;animation:loadingBounce 1.4s ease-in-out infinite both}.loading-dot:nth-child(1){animation-delay:-.32s}.loading-dot:nth-child(2){animation-delay:-.16s}@keyframes loadingBounce{0%,80%,to{transform:scale(.6);opacity:.5}40%{transform:scale(1);opacity:1}}.error-banner{flex-shrink:0;padding:8px 16px;background-color:var(--error-bg);color:var(--error-text);font-size:13px;text-align:center;animation:errorSlideIn .2s ease-out}@keyframes errorSlideIn{0%{opacity:0;transform:translateY(-100%)}to{opacity:1;transform:translateY(0)}}.input-area{flex-shrink:0;border-top:1px solid var(--border-color);background-color:var(--bg-color)}.input-top-row{display:flex;padding:8px 16px 0}.new-chat-button{background:none;border:1px solid var(--border-color);border-radius:16px;color:var(--text-secondary);font-size:12px;padding:4px 12px;cursor:pointer;transition:background-color .2s,color .2s}.new-chat-button:hover{background-color:var(--bg-secondary);color:var(--text-color)}.input-form{display:flex;align-items:center;gap:8px;padding:8px 16px 12px}.input-form.disabled{opacity:.6}.message-input{flex:1;padding:10px 14px;font-size:14px;border:1px solid var(--border-color);border-radius:20px;background-color:var(--bg-color);color:var(--text-color);outline:none;transition:border-color .2s,box-shadow .2s}.message-input:focus{border-color:var(--primary-color);box-shadow:0 0 0 2px #18181b1a}.message-input:disabled{background-color:var(--bg-secondary);cursor:not-allowed}.message-input::placeholder{color:var(--text-secondary)}.mic-button{flex-shrink:0;width:36px;height:36px;display:flex;align-items:center;justify-content:center;background:none;border:1px solid var(--border-color);border-radius:50%;color:var(--text-secondary);cursor:pointer;transition:background-color .2s,color .2s,border-color .2s}.mic-button:hover{background-color:var(--bg-secondary);color:var(--text-color)}.mic-button.active{background-color:#dc2626;border-color:#dc2626;color:#fff;animation:micPulse 1.5s ease-in-out infinite}@keyframes micPulse{0%,to{opacity:1}50%{opacity:.7}}.send-button{flex-shrink:0;width:40px;height:40px;display:flex;align-items:center;justify-content:center;background-color:var(--primary-color);color:#fff;border:none;border-radius:50%;cursor:pointer;transition:transform .1s,opacity .2s}.send-button:hover:not(:disabled){transform:scale(1.05)}.send-button:active:not(:disabled){transform:scale(.95)}.send-button:disabled{opacity:.5;cursor:not-allowed}.toast{position:fixed;top:16px;left:50%;transform:translate(-50%);background-color:var(--toast-bg);color:var(--toast-text);padding:10px 20px;border-radius:8px;font-size:13px;z-index:200;animation:toastSlideIn .3s ease-out;box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -2px #0000001a}@keyframes toastSlideIn{0%{opacity:0;transform:translate(-50%) translateY(-10px)}to{opacity:1;transform:translate(-50%) translateY(0)}}.error-page{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;padding:32px;text-align:center}.error-page-message{font-size:16px;color:var(--text-secondary);margin-top:16px}.message-list::-webkit-scrollbar{width:6px}.message-list::-webkit-scrollbar-track{background:transparent}.message-list::-webkit-scrollbar-thumb{background-color:var(--border-color);border-radius:3px}.message-list::-webkit-scrollbar-thumb:hover{background-color:var(--text-secondary)}