:root{color-scheme:light;--bg:#f5f7fb;--panel:#fff;--text:#172033;--muted:#778197;--line:#e6eaf1;--blue:#526fe8;--blue-soft:#eef2ff;--dark:#171922;--radius:8px;font-family:Inter,"Microsoft YaHei",system-ui,sans-serif;letter-spacing:0}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}button,input,textarea{font:inherit;letter-spacing:0}.hidden{display:none!important}.auth-view{min-height:100vh;display:grid;grid-template-columns:minmax(0,1.1fr) minmax(420px,.9fr);background:#f7f9fd}.auth-brand{display:flex;flex-direction:column;justify-content:center;padding:8vw;background:linear-gradient(145deg,#eef2ff,#f8faff 55%,#edf8f5)}.brand-mark{width:64px;height:64px;border-radius:16px;display:grid;place-items:center;background:#526fe8;color:#fff;font-size:28px;font-weight:800;box-shadow:0 16px 34px rgba(82,111,232,.25)}.brand-mark.small{width:36px;height:36px;border-radius:10px;font-size:17px;box-shadow:none}.auth-brand h1{font-size:42px;margin:28px 0 10px}.auth-brand p{font-size:18px;color:var(--muted)}.auth-panel{align-self:center;width:min(420px,calc(100% - 48px));margin:auto;padding:32px;background:var(--panel);border:1px solid var(--line);border-radius:8px;box-shadow:0 20px 60px rgba(30,44,80,.1)}.auth-tabs{display:flex;border-bottom:1px solid var(--line);margin-bottom:24px}.auth-tab{flex:1;border:0;background:transparent;padding:12px;color:var(--muted);cursor:pointer}.auth-tab.active{color:var(--blue);font-weight:700;border-bottom:2px solid var(--blue)}.auth-form{display:grid;gap:16px}.auth-form label{display:grid;gap:7px;font-size:13px;font-weight:700}.auth-form input{height:48px;border:1px solid var(--line);border-radius:8px;padding:0 14px;outline:0}.auth-form input:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(82,111,232,.1)}.primary{height:48px;border:0;border-radius:8px;background:var(--blue);color:#fff;font-weight:700;cursor:pointer}.text-button{border:0;background:transparent;color:var(--blue);cursor:pointer}.form-message{min-height:22px;margin-top:12px;font-size:13px;color:#d64555}.version-label{display:block;text-align:center;color:#a0a8b8;font-size:12px;margin-top:18px}.app-shell{height:100vh;display:grid;grid-template-columns:238px 1fr}.sidebar{background:#fff;border-right:1px solid var(--line);display:flex;flex-direction:column;padding:18px 12px}.sidebar-brand{height:48px;display:flex;align-items:center;gap:10px;padding:0 8px;margin-bottom:18px}.sidebar nav{display:grid;gap:5px}.nav-item{height:46px;border:0;border-radius:8px;background:transparent;color:#596278;text-align:left;padding:0 14px;display:flex;align-items:center;gap:12px;cursor:pointer}.nav-item span{width:20px;text-align:center;font-size:17px}.nav-item:hover{background:#f5f7fb}.nav-item.active{background:var(--blue-soft);color:var(--blue);font-weight:700}.sidebar-user{margin-top:auto;border-top:1px solid var(--line);padding:16px 6px 0;display:grid;grid-template-columns:38px 1fr 32px;align-items:center;gap:9px}.avatar{width:38px;height:38px;border-radius:50%;background:#e8edff;color:var(--blue);display:grid;place-items:center;font-weight:800}.sidebar-user div:nth-child(2){display:grid;min-width:0}.sidebar-user strong{font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sidebar-user span{font-size:11px;color:var(--muted)}.sidebar-user button{border:0;background:transparent;color:var(--muted);font-size:18px;cursor:pointer}.workspace{min-width:0;display:flex;flex-direction:column}.workspace-header{height:76px;background:rgba(255,255,255,.9);border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 28px;gap:16px}.workspace-header h2{margin:0;font-size:20px}.workspace-header p{margin:3px 0 0;color:var(--muted);font-size:12px}.model-picker{margin-left:auto;height:40px;border:1px solid var(--line);background:#fff;border-radius:8px;padding:0 14px;cursor:pointer}.menu-button{display:none;border:0;background:transparent;font-size:22px}.screen-content{flex:1;min-height:0;padding:24px;overflow:auto}.empty-state{height:100%;display:grid;place-items:center}.empty-inner{width:min(680px,100%);text-align:center}.empty-symbol{width:72px;height:72px;margin:auto;border-radius:20px;display:grid;place-items:center;background:var(--blue-soft);color:var(--blue);font-size:30px}.empty-inner h1{font-size:30px;margin:22px 0 8px}.empty-inner p{color:var(--muted);margin:0 0 24px}.prompt-box{display:flex;background:#fff;border:1px solid var(--line);border-radius:8px;padding:8px;box-shadow:0 12px 32px rgba(40,55,90,.08)}.prompt-box textarea{flex:1;resize:none;border:0;outline:0;padding:11px;min-height:76px}.prompt-box button{width:48px;height:48px;align-self:flex-end;border:0;border-radius:8px;background:var(--blue);color:#fff;font-size:20px}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.feature{background:#fff;border:1px solid var(--line);border-radius:8px;padding:18px}.feature strong{display:block;margin-bottom:6px}.feature span{font-size:13px;color:var(--muted)}.toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,20px);background:#202534;color:#fff;border-radius:8px;padding:11px 18px;opacity:0;pointer-events:none;transition:.2s}.toast.show{opacity:1;transform:translate(-50%,0)}@media(max-width:760px){.auth-view{grid-template-columns:1fr}.auth-brand{display:none}.auth-panel{width:calc(100% - 28px);padding:24px}.app-shell{grid-template-columns:1fr}.sidebar{position:fixed;z-index:5;inset:0 auto 0 0;width:250px;transform:translateX(-100%);transition:.2s;box-shadow:18px 0 50px rgba(20,30,50,.15)}.sidebar.open{transform:none}.menu-button{display:block}.workspace-header{height:auto;min-height:72px;padding:12px 14px}.screen-content{padding:16px}.feature-grid{grid-template-columns:1fr}.model-picker{max-width:130px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.empty-inner h1{font-size:25px}}