:root{--bg:#f4f6f8;--surface:#fff;--surface-muted:#f7f9fb;--ink:#172033;--muted:#687287;--line:#dfe4eb;--green:#12715b;--green-dark:#0c5948;--green-soft:#e8f4f0;--blue:#1769aa;--blue-soft:#eaf3fb;--amber:#a75f0b;--amber-soft:#fff4df;--red:#ba3a43;--red-soft:#fdeced;--shadow:0 16px 36px #232d4217}*{box-sizing:border-box}html,body{min-height:100%}body{background:var(--bg);color:var(--ink);margin:0;font-family:Microsoft YaHei,PingFang SC,Arial,sans-serif}button,input,textarea{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}.auth-page{background-color:#eef2f5;background-image:linear-gradient(90deg,#0000 49px,#1f2a3d09 50px),linear-gradient(#0000 49px,#1f2a3d09 50px),none;background-position:0 0,0 0,0 0;background-repeat:repeat,repeat,repeat;background-size:50px 50px;background-attachment:scroll,scroll,scroll;background-origin:padding-box,padding-box,padding-box;background-clip:border-box,border-box,border-box;place-items:center;min-height:100vh;padding:24px;display:grid}.auth-panel{border:1px solid var(--line);background:var(--surface);width:min(440px,100%);box-shadow:var(--shadow);text-align:center;border-radius:8px;padding:42px}.auth-tabs{background:var(--surface-muted);border-radius:7px;grid-template-columns:1fr 1fr;gap:4px;margin:22px 0 20px;padding:4px;display:grid}.auth-tabs button{background:0 0;border-color:#0000;justify-content:center;align-items:center;gap:7px;display:flex}.auth-tabs button.active{color:var(--green);background:#fff;box-shadow:0 1px 4px #1d28391f}.auth-form{text-align:left}.auth-input{display:block;position:relative}.auth-input svg{z-index:1;color:#8994a4;position:absolute;top:13px;left:12px}.auth-input input{padding-left:39px}.auth-submit{width:100%;min-height:46px}.auth-error{color:var(--red);margin:-3px 0 13px;font-size:12px;line-height:1.55}.brand-mark{background:var(--green);color:#fff;border-radius:8px;flex:0 0 42px;place-items:center;width:42px;height:42px;font-size:23px;font-weight:900;display:grid}.auth-panel .brand-mark{width:58px;height:58px;margin:0 auto 22px;font-size:30px}.eyebrow{color:var(--green);margin:0 0 6px;font-size:13px;font-weight:800}.auth-panel h1{margin:0 0 14px;font-size:30px}.auth-copy{color:var(--muted);margin:0 0 26px;line-height:1.75}.primary-link{background:var(--green);color:#fff;border-radius:7px;justify-content:center;align-items:center;min-height:48px;font-weight:800;text-decoration:none;display:flex}.primary-link:hover{background:var(--green-dark)}.auth-note{color:var(--muted);margin:16px 0 0;font-size:12px}.app{min-height:100vh}.topbar{z-index:20;border-bottom:1px solid var(--line);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#fffffff5;grid-template-columns:minmax(250px,1fr) auto minmax(250px,1fr);align-items:center;min-height:68px;padding:0 24px;display:grid;position:sticky;top:0}.brand,.brand span,.section-heading>span,.saved,.account,.tabs,.tabs button,.toolbar,.running-bar,.file-row,.file-picker,.number-field,.primary,.search-box,.modal-actions{align-items:center;display:flex}.brand{gap:11px}.brand>span:last-child{flex-direction:column;align-items:flex-start}.brand strong{font-size:16px}.brand small{color:var(--muted);margin-top:2px;font-size:11px}.tabs{background:var(--surface-muted);border-radius:7px;gap:4px;padding:4px}.tabs button{min-height:38px;color:var(--muted);background:0 0;border:0;border-radius:6px;gap:7px;padding:0 14px;font-weight:700}.tabs button.active{color:var(--ink);background:#fff;box-shadow:0 1px 4px #1d28391f}.account{min-width:0;color:var(--muted);justify-content:flex-end;gap:8px;font-size:13px}.account span{text-overflow:ellipsis;white-space:nowrap;max-width:220px;overflow:hidden}.account a,.account-logout{width:34px;height:34px;min-height:34px;color:var(--muted);background:0 0;border:0;border-radius:6px;place-items:center;padding:0;display:grid}.account a:hover,.account-logout:hover{background:var(--surface-muted);color:var(--red)}.workspace{grid-template-columns:350px minmax(0,1fr);min-height:calc(100vh - 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