:root{--bg-main:#fff;--bg-sidebar:#fff;--text-primary:#1f1f1f;--text-secondary:#6e6e6e;--border-color:#e7e7e7;--input-bg:#f7f7f8;--primary-blue:#1677ff;--radius-sm:6px;--radius-md:16px}*{margin:0;padding:0;box-sizing:border-box;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}body{background:var(--bg-main);color:var(--text-primary);overflow:hidden;height:100vh}.app-container{display:flex;height:100vh}.sidebar{width:260px;flex:0 0 260px;background:var(--bg-sidebar);border-right:1px solid var(--border-color);display:flex;flex-direction:column;transition:width .2s ease,flex-basis .2s ease;overflow:hidden}.sidebar.collapsed{width:0;flex-basis:0;border:0}.sidebar-header{height:58px;padding:0 14px 0 18px;display:flex;align-items:center;justify-content:space-between}.logo{font-size:20px;font-weight:700;letter-spacing:-.03em}.header-actions{display:flex;gap:2px}.icon-btn,.collapse-btn,.dialog-close{border:0;background:transparent;color:var(--text-secondary);cursor:pointer;border-radius:var(--radius-sm);transition:background .15s ease;color .15s ease}.icon-btn{width:32px;height:32px;font-size:18px}.icon-btn:hover,.collapse-btn:hover,.dialog-close:hover,.nav-item:hover,.newchat-btn:hover,.history-item:hover,.text-action:hover{background:#f2f2f2;color:var(--text-primary)}.sidebar-newchat{padding:8px 13px}.newchat-btn{width:100%;border:0;background:transparent;text-align:left;padding:10px 12px;border-radius:var(--radius-sm);font-size:14px;cursor:pointer;color:var(--text-primary)}.sidebar-nav{padding:7px 8px;border-bottom:1px solid var(--border-color)}.nav-item{display:block;width:100%;border:0;background:transparent;text-align:left;padding:9px 12px;border-radius:var(--radius-sm);font-size:14px;color:var(--text-primary);cursor:pointer}.sidebar-history{flex:1;overflow-y:auto;padding:16px 8px}.sidebar-history::-webkit-scrollbar{width:4px}.sidebar-history::-webkit-scrollbar-thumb{background:#ddd;border-radius:4px}.history-title{font-size:12px;color:var(--text-secondary);padding:0 12px 8px}.history-list{display:flex;flex-direction:column;gap:1px}.history-item{border:0;background:transparent;text-align:left;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;width:100%;padding:9px 12px;border-radius:var(--radius-sm);font-size:13px;color:var(--text-primary);cursor:pointer}.sidebar-footer{border-top:1px solid var(--border-color);padding:10px;display:flex;align-items:center;justify-content:space-between;gap:8px}.user-info{display:flex;align-items:center;gap:9px;min-width:0}.avatar{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:var(--primary-blue);color:#fff;font-size:11px;font-weight:600}.username{font-size:13px;white-space:nowrap}.upgrade-btn{border:1px solid var(--border-color);background:#fff;border-radius:var(--radius-sm);padding:6px 10px;color:var(--text-primary);cursor:pointer}.main-panel{flex:1;min-width:0;height:100vh;display:flex;flex-direction:column}.top-tab-bar{height:60px;padding:12px;display:flex;gap:6px;justify-content:center;align-items:center;border-bottom:1px solid transparent;position:relative}.tab-btn{border:0;background:transparent;color:var(--text-secondary);padding:7px 16px;border-radius:20px;font-size:14px;cursor:pointer}.tab-btn:hover{background:#f2f2f2}.tab-btn.active{background:#fff;border:1px solid var(--border-color);color:var(--text-primary)}.star{color:var(--primary-blue);margin-right:4px}.collapse-btn{position:absolute;left:14px;width:32px;height:32px;font-size:16px}.chat-container{flex:1;min-height:0;display:flex;flex-direction:column;position:relative}.chat-welcome{flex:1;overflow-y:auto;display:flex;align-items:center;justify-content:center;padding:30px}.welcome-text{font-size:20px;color:var(--text-secondary)}.message-list{width:min(760px,92vw);margin:auto;display:flex;flex-direction:column;gap:18px;padding:36px 0}.message{line-height:1.65;font-size:15px;white-space:pre-wrap}.message.user{align-self:flex-end;background:var(--input-bg);border-radius:16px;padding:10px 14px;max-width:75%}.message.assistant{width:100%;padding:0 20px}.input-wrapper{padding:16px 24px 12px}.chat-input-box{display:flex;align-items:center;gap:8px;background:var(--input-bg);border-radius:var(--radius-md);padding:12px 16px;width:min(720px,90vw);margin:0 auto}.input-prefix{border:0;background:transparent;color:var(--text-secondary);font-size:24px;cursor:pointer;line-height:1}.chat-input-box input{flex:1;min-width:0;border:0;outline:0;background:transparent;font-size:16px;color:var(--text-primary)}.chat-input-box input::placeholder{color:var(--text-secondary)}.input-actions{display:flex;align-items:center;gap:5px}.text-action{border:0;background:transparent;border-radius:var(--radius-sm);padding:7px 8px;color:var(--text-secondary);cursor:pointer}.mic-btn{font-size:16px}.send-btn{width:32px;height:32px;border:0;border-radius:50%;background:var(--primary-blue);color:#fff;cursor:pointer;font-size:15px}.send-btn:disabled{opacity:.45;cursor:not-allowed}.disclaimer{text-align:center;color:#999;font-size:11px;padding-top:8px}.command-palette{position:absolute;bottom:90px;left:50%;transform:translateX(-50%);width:min(720px,90vw);background:#fff;border:1px solid var(--border-color);border-radius:12px;padding:6px;z-index:3}.command-item{display:flex;width:100%;gap:12px;border:0;background:#fff;padding:11px 12px;text-align:left;border-radius:7px;cursor:pointer}.command-item:hover{background:#f2f2f2}.command-item b{width:85px}.command-item span{color:var(--text-secondary)}dialog{border:1px solid var(--border-color);border-radius:12px;padding:0;width:min(440px,calc(100vw - 32px));color:var(--text-primary)}dialog::backdrop{background:#0002}.dialog-header{display:flex;justify-content:space-between;align-items:center;padding:20px;border-bottom:1px solid var(--border-color)}.dialog-header h2{font-size:18px}.dialog-close{font-size:22px;width:30px;height:30px}.settings-dialog form,.dialog-header~*{}.dialog-header~label,.save-btn,.web-login{display:block;margin:16px 20px 0}label{font-size:13px;color:var(--text-secondary)}label input{display:block;width:100%;margin-top:7px;padding:10px;border:1px solid var(--border-color);border-radius:var(--radius-sm);outline:0;font-size:14px}label input:focus{border-color:var(--primary-blue)}.save-btn{border:0;background:var(--primary-blue);color:#fff;border-radius:var(--radius-sm);padding:10px 18px;cursor:pointer}.web-login{border-top:1px solid var(--border-color);padding:16px 0 20px;display:flex;gap:7px;flex-wrap:wrap}.web-login b{width:100%;font-size:13px;margin-bottom:2px}.web-login button{border:1px solid var(--border-color);background:#fff;border-radius:var(--radius-sm);padding:8px 10px;cursor:pointer}.web-login button:hover{background:#f2f2f2}@media(max-width:700px){.sidebar{width:0;flex-basis:0;border:0}.sidebar.open{width:260px;flex-basis:260px;border-right:1px solid var(--border-color)}.input-wrapper{padding:12px}.chat-input-box{width:100%}.welcome-text{font-size:18px}}