*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg-primary:#212121;--bg-secondary:#2f2f2f;--bg-tertiary:#3a3a3a;
  --bg-hover:#2a2a2a;--bg-sidebar:#171717;--text-primary:#ececec;
  --text-secondary:#8e8ea0;--text-muted:#6b6b7b;--border-color:#3a3a3a;
  --accent:#10a37f;--danger:#ef4444;--send-bg:#ececec;--send-color:#212121;
  --send-disabled:#3a3a3a;--code-bg:#1e1e1e;--scroll:#3a3a3a;
  --r:12px;--rs:8px;--sw:260px;
  --font:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif
}
.light-theme{
  --bg-primary:#fff;--bg-secondary:#f7f7f8;--bg-tertiary:#ececec;
  --bg-hover:#f0f0f0;--bg-sidebar:#f7f7f8;--text-primary:#0d0d0d;
  --text-secondary:#6b6b7b;--text-muted:#9b9bab;--border-color:#e5e5e5;
  --send-bg:#0d0d0d;--send-color:#fff;--send-disabled:#d1d1d1;
  --code-bg:#f6f8fa;--scroll:#d1d1d1
}
html,body{height:100%;font-family:var(--font);background:var(--bg-primary);color:var(--text-primary);font-size:15px;line-height:1.6;overflow:hidden}
::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--scroll);border-radius:3px}
body{display:flex;height:100vh}
.sidebar{width:var(--sw);min-width:var(--sw);height:100vh;background:var(--bg-sidebar);display:flex;flex-direction:column;border-right:1px solid var(--border-color);transition:width .2s,min-width .2s;overflow:hidden;z-index:100}
.sidebar.collapsed{width:0;min-width:0;border-right:none}
.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:12px 12px 8px}
.sidebar-search{padding:4px 12px 8px}
.search-box{display:flex;align-items:center;gap:8px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--rs);padding:7px 10px;color:var(--text-secondary)}
.search-box input{background:none;border:none;outline:none;color:var(--text-primary);font-size:13px;width:100%;font-family:var(--font)}
.search-box input::placeholder{color:var(--text-muted)}
.sidebar-nav{flex:1;overflow-y:auto;padding:4px 8px}
.chat-list{display:flex;flex-direction:column;gap:1px}
.chat-group-label{font-size:11px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;padding:12px 8px 4px}
.chat-item{display:flex;align-items:center;gap:8px;padding:8px 10px;border-radius:var(--rs);cursor:pointer;color:var(--text-secondary);font-size:13.5px;transition:background .15s;position:relative}
.chat-item:hover{background:var(--bg-hover);color:var(--text-primary)}
.chat-item.active{background:var(--bg-secondary);color:var(--text-primary)}
.chat-item-title{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.chat-item-actions{display:none;gap:2px;align-items:center}
.chat-item:hover .chat-item-actions,.chat-item.active .chat-item-actions{display:flex}
.chat-item-actions button{background:none;border:none;color:var(--text-muted);cursor:pointer;padding:3px;border-radius:4px;display:flex;align-items:center;transition:color .15s,background .15s}
.chat-item-actions button:hover{color:var(--text-primary);background:var(--bg-tertiary)}
.sidebar-footer{padding:8px 12px 12px;border-top:1px solid var(--border-color)}
.user-profile{display:flex;align-items:center;gap:10px;padding:8px;border-radius:var(--rs);cursor:pointer;transition:background .15s}
.user-profile:hover{background:var(--bg-hover)}
.avatar{width:32px;height:32px;border-radius:50%;background:var(--accent);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;color:#fff;flex-shrink:0}
.user-info{flex:1;display:flex;flex-direction:column}
.user-name{font-size:13px;font-weight:500;color:var(--text-primary)}
.user-plan{font-size:11px;color:var(--text-muted)}
.main-content{flex:1;display:flex;flex-direction:column;height:100vh;overflow:hidden;background:var(--bg-primary);position:relative}
.topbar{height:56px;display:flex;align-items:center;justify-content:space-between;padding:0 16px;border-bottom:1px solid var(--border-color);flex-shrink:0;position:relative;z-index:50}
.topbar-left,.topbar-right{display:flex;align-items:center;gap:8px}
.model-selector{display:flex;align-items:center;gap:6px;padding:6px 10px;border-radius:var(--rs);cursor:pointer;transition:background .15s;color:var(--text-primary);font-weight:600;font-size:15px}
.model-selector:hover{background:var(--bg-hover)}
.share-btn{display:flex;align-items:center;gap:6px;padding:6px 12px;border-radius:var(--rs);border:1px solid var(--border-color);background:none;color:var(--text-primary);font-size:13px;cursor:pointer;transition:background .15s;font-family:var(--font)}
.share-btn:hover{background:var(--bg-hover)}
.model-dropdown{position:absolute;top:60px;left:16px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--r);padding:6px;z-index:200;min-width:300px;box-shadow:0 8px 32px rgba(0,0,0,.4)}
.model-option{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:var(--rs);cursor:pointer;transition:background .15s}
.model-option:hover{background:var(--bg-hover)}
.model-option.active{background:var(--bg-tertiary)}
.model-icon{width:36px;height:36px;border-radius:8px;background:var(--accent);display:flex;align-items:center;justify-content:center;color:#fff;flex-shrink:0}
.model-icon.mini{background:#7c3aed}.model-icon.reasoning{background:#d97706}
.model-details{flex:1;display:flex;flex-direction:column}
.model-title{font-size:14px;font-weight:500;color:var(--text-primary)}
.model-desc{font-size:12px;color:var(--text-muted)}
.check-icon{color:var(--text-primary);flex-shrink:0}
.chat-area{flex:1;overflow-y:auto;display:flex;flex-direction:column;position:relative}
.welcome-screen{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:40px 20px;gap:24px}
.welcome-logo{color:var(--text-primary);opacity:.9}
.welcome-title{font-size:28px;font-weight:600;color:var(--text-primary);text-align:center}
.suggestion-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;max-width:640px;width:100%}
.suggestion-card{display:flex;align-items:flex-start;gap:12px;padding:14px 16px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--r);cursor:pointer;text-align:left;transition:background .15s,border-color .15s;font-family:var(--font)}
.suggestion-card:hover{background:var(--bg-tertiary);border-color:var(--text-muted)}
.suggestion-icon{color:var(--text-secondary);flex-shrink:0;margin-top:2px}
.suggestion-text{display:flex;flex-direction:column;gap:2px}
.suggestion-title{font-size:13px;font-weight:600;color:var(--text-primary)}
.suggestion-desc{font-size:12px;color:var(--text-secondary)}
.messages-container{display:flex;flex-direction:column;padding:20px 0 40px;max-width:800px;width:100%;margin:0 auto}
.message-wrapper{padding:8px 24px;display:flex;flex-direction:column;gap:4px}
.message-wrapper.user{align-items:flex-end}
.message-wrapper.assistant{align-items:flex-start}
.message-header{display:flex;align-items:center;gap:8px;margin-bottom:4px}
.message-avatar{width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:600;flex-shrink:0}
.message-avatar.ai{background:var(--bg-secondary);border:1px solid var(--border-color);color:var(--text-primary)}
.message-avatar.user-av{background:var(--accent);color:#fff}
.message-role{font-size:13px;font-weight:600;color:var(--text-primary)}
.message-bubble{max-width:85%;padding:12px 16px;border-radius:var(--r);font-size:15px;line-height:1.7;color:var(--text-primary)}
.message-wrapper.user .message-bubble{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:18px 18px 4px 18px}
.message-wrapper.assistant .message-bubble{background:transparent;padding:4px 0;max-width:100%}
.message-content h1,.message-content h2,.message-content h3{margin:16px 0 8px;font-weight:600;line-height:1.3}
.message-content h1{font-size:22px}.message-content h2{font-size:18px}.message-content h3{font-size:16px}
.message-content p{margin:8px 0}.message-content p:first-child{margin-top:0}.message-content p:last-child{margin-bottom:0}
.message-content ul,.message-content ol{margin:8px 0;padding-left:24px}
.message-content li{margin:4px 0}
.message-content strong{font-weight:600}.message-content em{font-style:italic}
.message-content a{color:var(--accent);text-decoration:none}.message-content a:hover{text-decoration:underline}
.message-content blockquote{border-left:3px solid var(--border-color);padding-left:16px;color:var(--text-secondary);margin:8px 0}
.message-content table{border-collapse:collapse;width:100%;margin:12px 0;font-size:14px}
.message-content th,.message-content td{border:1px solid var(--border-color);padding:8px 12px;text-align:left}
.message-content th{background:var(--bg-secondary);font-weight:600}
.message-content code{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:4px;padding:1px 6px;font-size:13px;font-family:'Fira Code',Consolas,monospace}
.message-content pre{background:var(--code-bg);border:1px solid var(--border-color);border-radius:var(--rs);margin:12px 0;overflow:hidden}
.message-content pre code{background:none;border:none;padding:16px;font-size:13px;display:block;overflow-x:auto}
.code-block-wrapper{background:var(--code-bg);border:1px solid var(--border-color);border-radius:var(--rs);margin:12px 0;overflow:hidden}
.code-block-header{display:flex;align-items:center;justify-content:space-between;padding:8px 16px;background:rgba(255,255,255,.04);border-bottom:1px solid var(--border-color)}
.code-lang{font-size:12px;color:var(--text-muted);font-family:monospace}
.copy-code-btn{display:flex;align-items:center;gap:6px;background:none;border:none;color:var(--text-muted);font-size:12px;cursor:pointer;padding:3px 8px;border-radius:4px;transition:color .15s,background .15s;font-family:var(--font)}
.copy-code-btn:hover{color:var(--text-primary);background:var(--bg-tertiary)}
.message-actions{display:flex;align-items:center;gap:4px;margin-top:6px;opacity:0;transition:opacity .15s}
.message-wrapper:hover .message-actions{opacity:1}
.action-btn{display:flex;align-items:center;gap:5px;background:none;border:none;color:var(--text-muted);cursor:pointer;padding:5px 8px;border-radius:var(--rs);font-size:12px;transition:color .15s,background .15s;font-family:var(--font)}
.action-btn:hover{color:var(--text-primary);background:var(--bg-secondary)}
.action-btn.liked{color:var(--accent)}.action-btn.disliked{color:var(--danger)}
.typing-indicator{display:flex;align-items:center;gap:4px;padding:12px 0}
.typing-dot{width:6px;height:6px;border-radius:50%;background:var(--text-muted);animation:typingBounce 1.2s infinite}
.typing-dot:nth-child(2){animation-delay:.2s}.typing-dot:nth-child(3){animation-delay:.4s}
@keyframes typingBounce{0%,60%,100%{transform:translateY(0);opacity:.4}30%{transform:translateY(-6px);opacity:1}}
.streaming-cursor{display:inline-block;width:2px;height:1em;background:var(--text-primary);margin-left:2px;vertical-align:text-bottom;animation:blink .8s infinite}
@keyframes blink{0%,100%{opacity:1}50%{opacity:0}}
.input-area{padding:12px 20px 16px;flex-shrink:0;display:flex;flex-direction:column;align-items:center;gap:8px}
.input-wrapper{width:100%;max-width:800px}
.input-box{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:16px;padding:12px 14px 10px;display:flex;flex-direction:column;gap:8px;transition:border-color .2s}
.input-box:focus-within{border-color:var(--text-muted)}
.input-tools-top{display:flex;align-items:center;gap:4px}
textarea#messageInput{background:none;border:none;outline:none;color:var(--text-primary);font-size:15px;font-family:var(--font);resize:none;width:100%;min-height:24px;max-height:200px;line-height:1.6;overflow-y:auto}
textarea#messageInput::placeholder{color:var(--text-muted)}
.input-tools-bottom{display:flex;align-items:center;justify-content:space-between}
.input-tools-left,.input-tools-right{display:flex;align-items:center;gap:8px}
.tool-btn{display:flex;align-items:center;gap:5px;background:none;border:1px solid var(--border-color);color:var(--text-secondary);cursor:pointer;padding:5px 10px;border-radius:20px;font-size:12.5px;transition:all .15s;font-family:var(--font)}
.tool-btn:hover{background:var(--bg-tertiary);color:var(--text-primary)}
.tool-btn.active{background:var(--bg-tertiary);color:var(--text-primary);border-color:var(--text-muted)}
.char-count{font-size:11px;color:var(--text-muted)}
.send-btn{width:32px;height:32px;border-radius:50%;border:none;background:var(--send-bg);color:var(--send-color);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s;flex-shrink:0}
.send-btn:disabled{background:var(--send-disabled);color:var(--text-muted);cursor:not-allowed}
.send-btn:not(:disabled):hover{transform:scale(1.05)}
.disclaimer{font-size:12px;color:var(--text-muted);text-align:center}
.icon-btn{width:36px;height:36px;border-radius:var(--rs);border:none;background:none;color:var(--text-secondary);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s,color .15s}
.icon-btn:hover{background:var(--bg-hover);color:var(--text-primary)}
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:1000;display:flex;align-items:center;justify-content:center;backdrop-filter:blur(4px)}
.modal{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--r);width:560px;max-width:95vw;max-height:80vh;display:flex;flex-direction:column;overflow:hidden}
.modal-header{display:flex;align-items:center;justify-content:space-between;padding:20px 24px 16px;border-bottom:1px solid var(--border-color)}
.modal-header h2{font-size:17px;font-weight:600}
.modal-body{display:flex;overflow:hidden;flex:1}
.settings-nav{width:160px;padding:12px 8px;border-right:1px solid var(--border-color);display:flex;flex-direction:column;gap:2px;flex-shrink:0}
.settings-nav-item{background:none;border:none;color:var(--text-secondary);font-size:13.5px;padding:8px 12px;border-radius:var(--rs);cursor:pointer;text-align:left;transition:all .15s;font-family:var(--font)}
.settings-nav-item:hover{background:var(--bg-hover);color:var(--text-primary)}
.settings-nav-item.active{background:var(--bg-tertiary);color:var(--text-primary);font-weight:500}
.settings-content{flex:1;padding:16px 24px;overflow-y:auto}
.settings-tab{display:none;flex-direction:column;gap:4px}
.settings-tab.active{display:flex}
.setting-row{display:flex;align-items:center;justify-content:space-between;padding:14px 0;border-bottom:1px solid var(--border-color);gap:16px}
.setting-row:last-child{border-bottom:none}
.setting-info{display:flex;flex-direction:column;gap:2px}
.setting-label{font-size:14px;font-weight:500;color:var(--text-primary)}
.setting-desc{font-size:12px;color:var(--text-muted)}
.setting-select{background:var(--bg-tertiary);border:1px solid var(--border-color);color:var(--text-primary);padding:6px 10px;border-radius:var(--rs);font-size:13px;cursor:pointer;font-family:var(--font);outline:none}
.danger-btn{background:none;border:1px solid var(--danger);color:var(--danger);padding:6px 14px;border-radius:var(--rs);font-size:13px;cursor:pointer;transition:all .15s;font-family:var(--font)}
.danger-btn:hover{background:var(--danger);color:#fff}
.toggle{position:relative;display:inline-block;width:44px;height:24px}
.toggle input{opacity:0;width:0;height:0}
.toggle-slider{position:absolute;cursor:pointer;inset:0;background:var(--bg-tertiary);border-radius:24px;transition:.2s;border:1px solid var(--border-color)}
.toggle-slider::before{content:'';position:absolute;width:18px;height:18px;left:2px;top:2px;background:var(--text-muted);border-radius:50%;transition:.2s}
.toggle input:checked+.toggle-slider{background:var(--accent);border-color:var(--accent)}
.toggle input:checked+.toggle-slider::before{transform:translateX(20px);background:#fff}
.context-menu{position:fixed;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--rs);padding:4px;z-index:500;min-width:160px;box-shadow:0 8px 24px rgba(0,0,0,.3)}
.context-item{display:flex;align-items:center;gap:8px;width:100%;background:none;border:none;color:var(--text-secondary);font-size:13.5px;padding:8px 12px;border-radius:6px;cursor:pointer;text-align:left;transition:all .15s;font-family:var(--font)}
.context-item:hover{background:var(--bg-hover);color:var(--text-primary)}
.context-item.danger{color:var(--danger)}
.context-item.danger:hover{background:rgba(239,68,68,.1)}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(20px);background:var(--bg-tertiary);border:1px solid var(--border-color);color:var(--text-primary);padding:10px 18px;border-radius:8px;font-size:13.5px;z-index:9999;opacity:0;transition:all .3s;pointer-events:none;white-space:nowrap}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.rename-input{background:var(--bg-tertiary);border:1px solid var(--accent);border-radius:4px;color:var(--text-primary);font-size:13.5px;padding:2px 6px;outline:none;width:100%;font-family:var(--font)}
.stop-btn{display:flex;align-items:center;gap:6px;background:none;border:1px solid var(--border-color);color:var(--text-secondary);padding:6px 14px;border-radius:20px;font-size:13px;cursor:pointer;transition:all .15s;font-family:var(--font);margin:8px auto}
.stop-btn:hover{background:var(--bg-secondary);color:var(--text-primary)}
.hidden{display:none!important}
@media(max-width:768px){
  .sidebar{position:fixed;left:0;top:0;transform:translateX(-100%);transition:transform .2s;z-index:200}
  .sidebar.mobile-open{transform:translateX(0)}
  .sidebar.collapsed{transform:translateX(-100%);width:var(--sw);min-width:var(--sw)}
  .suggestion-grid{grid-template-columns:1fr}
  .messages-container{padding:12px 0 32px}
  .message-wrapper{padding:6px 12px}
}
.install-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--bg-primary);overflow:auto;padding:20px;font-family:var(--font)}
.install-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:16px;width:100%;max-width:520px;overflow:hidden}
.install-header{padding:32px 32px 24px;text-align:center;border-bottom:1px solid var(--border-color)}
.install-logo{display:flex;align-items:center;justify-content:center;gap:12px;margin-bottom:12px}
.install-logo-icon{width:48px;height:48px;background:var(--accent);border-radius:12px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:22px;font-weight:700}
.install-logo-text{font-size:24px;font-weight:700;color:var(--text-primary)}
.install-subtitle{font-size:14px;color:var(--text-secondary)}
.install-body{padding:28px 32px 32px}
.install-steps{display:flex;margin-bottom:28px;position:relative}
.install-step{flex:1;display:flex;flex-direction:column;align-items:center;gap:6px;position:relative}
.install-step:not(:last-child)::after{content:'';position:absolute;top:14px;left:60%;width:80%;height:1px;background:var(--border-color)}
.step-num{width:28px;height:28px;border-radius:50%;background:var(--bg-tertiary);border:1px solid var(--border-color);display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:600;color:var(--text-muted);z-index:1}
.install-step.active .step-num,.install-step.done .step-num{background:var(--accent);border-color:var(--accent);color:#fff}
.step-label{font-size:11px;color:var(--text-muted);text-align:center}
.install-step.active .step-label{color:var(--text-primary)}
.form-group{display:flex;flex-direction:column;gap:6px;margin-bottom:16px}
.form-label{font-size:13px;font-weight:500;color:var(--text-primary)}
.form-input{background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:var(--rs);color:var(--text-primary);font-size:14px;padding:10px 12px;outline:none;font-family:var(--font);transition:border-color .2s;width:100%}
.form-input:focus{border-color:var(--accent)}
.form-input::placeholder{color:var(--text-muted)}
.form-hint{font-size:12px;color:var(--text-muted)}
.install-btn{width:100%;padding:11px;background:var(--accent);border:none;border-radius:var(--rs);color:#fff;font-size:14px;font-weight:600;cursor:pointer;transition:background .15s;font-family:var(--font);margin-top:8px}
.install-btn:hover{background:#0d8f6f}
.install-btn:disabled{background:var(--bg-tertiary);color:var(--text-muted);cursor:not-allowed}
.install-error{background:rgba(239,68,68,.1);border:1px solid rgba(239,68,68,.3);border-radius:var(--rs);padding:10px 14px;font-size:13px;color:var(--danger);margin-bottom:16px}
.install-success{text-align:center;padding:20px 0}
.install-success-icon{width:64px;height:64px;background:rgba(16,163,127,.15);border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 16px;color:var(--accent)}
.install-success h3{font-size:20px;font-weight:600;margin-bottom:8px}
.install-success p{font-size:14px;color:var(--text-secondary);margin-bottom:20px}
.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--bg-primary);font-family:var(--font)}
.auth-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:16px;width:100%;max-width:400px;padding:40px 36px}
.auth-logo{text-align:center;margin-bottom:28px}
.auth-logo-icon{width:56px;height:56px;background:var(--accent);border-radius:14px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:26px;font-weight:700;margin:0 auto 12px}
.auth-logo-text{font-size:22px;font-weight:700;color:var(--text-primary)}
.auth-title{font-size:20px;font-weight:600;text-align:center;margin-bottom:6px}
.auth-subtitle{font-size:14px;color:var(--text-secondary);text-align:center;margin-bottom:24px}
.auth-btn{width:100%;padding:11px;background:var(--accent);border:none;border-radius:var(--rs);color:#fff;font-size:14px;font-weight:600;cursor:pointer;transition:background .15s;font-family:var(--font)}