:root{--primary-color: #0071e3;--primary-hover: #0077ed;--bg-dark: #000000;--bg-card: #1a1a1a;--bg-hover: #2a2a2a;--text-primary: #ffffff;--text-secondary: rgba(255, 255, 255, .6);--border-color: rgba(255, 255, 255, .1);--success-color: #34c759;--danger-color: #ff3b30;--shadow: 0 4px 16px rgba(0, 0, 0, .3)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,SF Pro Display,Segoe UI,Roboto,sans-serif;background:var(--bg-dark);color:var(--text-primary);line-height:1.6;overflow:hidden;-webkit-font-smoothing:antialiased}.chat-container{display:flex;height:100vh;width:100vw}.sidebar{width:280px;background:var(--bg-card);border-right:1px solid var(--border-color);display:flex;flex-direction:column;transition:transform .3s ease}.sidebar-header{padding:1.5rem 1rem;border-bottom:1px solid var(--border-color)}.sidebar-header h1{font-size:1.25rem;font-weight:600;margin-bottom:1rem;display:flex;align-items:center;gap:.5rem}.new-chat-btn{width:100%;padding:.75rem 1rem;background:var(--primary-color);color:#fff;border:none;border-radius:.5rem;font-size:.875rem;font-weight:500;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:.5rem;transition:all .2s ease}.new-chat-btn:hover{background:var(--primary-hover);transform:translateY(-1px)}.new-chat-btn:active{transform:translateY(0)}.chat-history{flex:1;overflow-y:auto;padding:.5rem}.chat-history::-webkit-scrollbar{width:6px}.chat-history::-webkit-scrollbar-track{background:transparent}.chat-history::-webkit-scrollbar-thumb{background:#ffffff1a;border-radius:3px}.chat-history::-webkit-scrollbar-thumb:hover{background:#fff3}.history-item{padding:.75rem;margin-bottom:.5rem;border-radius:.5rem;cursor:pointer;transition:background .2s ease;font-size:.875rem}.history-item:hover,.history-item.active{background:var(--bg-hover)}.sidebar-footer{padding:1rem;border-top:1px solid var(--border-color)}.user-info{display:flex;align-items:center;gap:.75rem}.user-avatar{width:36px;height:36px;background:var(--bg-hover);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.25rem}.user-name{font-size:.875rem;font-weight:500}.chat-main{flex:1;display:flex;flex-direction:column;background:var(--bg-dark)}.chat-header{padding:1rem 1.5rem;border-bottom:1px solid var(--border-color);display:flex;justify-content:space-between;align-items:center;background:var(--bg-card)}.chat-title h2{font-size:1.125rem;font-weight:600;margin-bottom:.25rem}.status-indicator{font-size:.75rem;color:var(--success-color);display:flex;align-items:center;gap:.25rem}.chat-actions{display:flex;gap:.5rem}.action-btn{width:36px;height:36px;background:transparent;border:1px solid var(--border-color);border-radius:.5rem;color:var(--text-secondary);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s ease}.action-btn:hover{background:var(--bg-hover);color:var(--text-primary);border-color:var(--text-secondary)}.messages-container{flex:1;overflow-y:auto;padding:2rem 1.5rem;display:flex;flex-direction:column;gap:1.5rem}.messages-container::-webkit-scrollbar{width:8px}.messages-container::-webkit-scrollbar-track{background:transparent}.messages-container::-webkit-scrollbar-thumb{background:#ffffff1a;border-radius:4px}.messages-container::-webkit-scrollbar-thumb:hover{background:#fff3}.welcome-message{max-width:600px;margin:auto;text-align:center;padding:2rem}.welcome-icon{font-size:4rem;margin-bottom:1rem}.welcome-message h3{font-size:1.75rem;font-weight:600;margin-bottom:.75rem}.welcome-message p{color:var(--text-secondary);margin-bottom:2rem;line-height:1.8}.welcome-tips{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap}.tip{padding:.5rem 1rem;background:var(--bg-card);border:1px solid var(--border-color);border-radius:2rem;font-size:.875rem;color:var(--text-secondary)}.message{display:flex;gap:.75rem;max-width:800px;animation:fadeInUp .3s ease}@keyframes fadeInUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.message.user{align-self:flex-end;flex-direction:row-reverse}.message-avatar{width:36px;height:36px;border-radius:50%;background:var(--bg-card);display:flex;align-items:center;justify-content:center;font-size:1.25rem;flex-shrink:0}.message.user .message-avatar{background:var(--primary-color)}.message-content{flex:1;display:flex;flex-direction:column;gap:.5rem}.message-bubble{padding:.875rem 1.125rem;border-radius:1rem;background:var(--bg-card);border:1px solid var(--border-color);word-wrap:break-word;line-height:1.6}.message.user .message-bubble{background:var(--primary-color);border-color:var(--primary-color)}.message-time{font-size:.75rem;color:var(--text-secondary);padding:0 .5rem}.input-container{padding:1rem 1.5rem;border-top:1px solid var(--border-color);background:var(--bg-card)}.input-wrapper{display:flex;gap:.75rem;align-items:flex-end;background:var(--bg-dark);border:1px solid var(--border-color);border-radius:1rem;padding:.75rem 1rem;transition:border-color .2s ease}.input-wrapper:focus-within{border-color:var(--primary-color)}.message-input{flex:1;background:transparent;border:none;outline:none;color:var(--text-primary);font-size:.9375rem;font-family:inherit;resize:none;max-height:120px;min-height:24px;line-height:1.5}.message-input::-moz-placeholder{color:var(--text-secondary)}.message-input::placeholder{color:var(--text-secondary)}.message-input::-webkit-scrollbar{width:4px}.message-input::-webkit-scrollbar-thumb{background:#ffffff1a;border-radius:2px}.send-btn{width:36px;height:36px;background:var(--primary-color);border:none;border-radius:.5rem;color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s ease;flex-shrink:0}.send-btn:hover:not(:disabled){background:var(--primary-hover);transform:scale(1.05)}.send-btn:active:not(:disabled){transform:scale(.95)}.send-btn:disabled{opacity:.4;cursor:not-allowed}.input-footer{margin-top:.75rem;text-align:center}.input-hint{font-size:.75rem;color:var(--text-secondary)}.typing-indicator{display:flex;gap:.25rem;padding:1rem}.typing-dot{width:8px;height:8px;background:var(--text-secondary);border-radius:50%;animation:typing 1.4s infinite}.typing-dot:nth-child(2){animation-delay:.2s}.typing-dot:nth-child(3){animation-delay:.4s}@keyframes typing{0%,60%,to{opacity:.3;transform:translateY(0)}30%{opacity:1;transform:translateY(-8px)}}@media(max-width:768px){.sidebar{position:fixed;left:0;top:0;height:100vh;z-index:100;transform:translate(-100%)}.sidebar.active{transform:translate(0)}.chat-main{width:100%}.messages-container{padding:1rem}.message{max-width:100%}.welcome-message{padding:1rem}}.message-bubble pre{background:#0000004d;padding:1rem;border-radius:.5rem;overflow-x:auto;margin:.5rem 0}.message-bubble code{background:#0000004d;padding:.2rem .4rem;border-radius:.25rem;font-family:SF Mono,Monaco,Courier New,monospace;font-size:.875em}.message-bubble pre code{background:transparent;padding:0}.message-bubble p{margin:.5rem 0}.message-bubble p:first-child{margin-top:0}.message-bubble p:last-child{margin-bottom:0}.message-bubble ul,.message-bubble ol{margin:.5rem 0;padding-left:1.5rem}.message-bubble li{margin:.25rem 0}.message-bubble a{color:var(--primary-color);text-decoration:none}.message-bubble a:hover{text-decoration:underline}.error-message{background:#ff3b301a;border:1px solid var(--danger-color);color:var(--danger-color);padding:1rem;border-radius:.5rem;margin:1rem 0;font-size:.875rem}
