:root{color-scheme:light;--ink:#172033;--muted:#667085;--line:#e3e7ee;--surface:#ffffff;--surface-soft:#f6f8fb;--sidebar:#182235;--accent:#2e65d3;--accent-soft:#edf3ff;--green:#16794d;--green-soft:#eaf7f0;--shadow:0 12px 30px rgba(19,31,53,0.08);font-family:Inter,PingFang SC,Microsoft YaHei,system-ui,sans-serif}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--surface-soft)}button,input{font:inherit;letter-spacing:0}a,button{-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}svg{flex:none}.app-shell{min-height:100vh;display:grid;grid-template-columns:224px minmax(0,1fr)}.sidebar{position:-webkit-sticky;position:sticky;top:0;height:100vh;padding:18px 12px;display:flex;flex-direction:column;background:var(--sidebar);color:#c4ccda}.brand{height:44px;padding:0 10px;display:flex;align-items:center;gap:10px;color:#fff}.brand>span{width:28px;height:28px;display:grid;place-items:center;border-radius:6px;background:#fff;color:var(--sidebar);font-weight:700}.brand strong{font-size:14px;font-weight:600}.sidebar nav{display:grid;grid-gap:3px;gap:3px;margin-top:18px}.sidebar nav a{min-height:40px;padding:0 11px;display:flex;align-items:center;gap:10px;border-radius:6px;font-size:13px}.sidebar nav a.active,.sidebar nav a:hover{background:rgba(255,255,255,.1);color:#fff}.nav-label{margin:24px 11px 0;color:#7f8ba0;font-size:11px}.account-summary{margin-top:auto;padding:12px 10px 2px;border-top:1px solid rgba(255,255,255,.1);display:flex;align-items:center;gap:9px}.account-summary span{display:grid;grid-gap:2px;gap:2px}.account-summary strong{color:#fff;font-size:12px}.account-summary small{color:#8f9aac;font-size:10px}.main-content{min-width:0;padding:30px 34px 48px}.page-header{display:flex;align-items:center;justify-content:space-between;gap:22px;margin-bottom:24px}.page-header h1{margin:3px 0 6px;font-size:25px;font-weight:650;letter-spacing:0}.page-header p{margin:0;color:var(--muted);font-size:13px}.eyebrow{font-size:11px!important;color:#8992a3!important}.header-actions{display:flex;align-items:center;gap:10px}.primary-button,.secondary-button{min-height:38px;padding:8px 14px;border-radius:6px;display:inline-flex;align-items:center;justify-content:center;gap:7px;white-space:nowrap;cursor:pointer}.primary-button{border:1px solid var(--accent);background:var(--accent);color:#fff}.primary-button:disabled{opacity:.6;cursor:wait}.secondary-button{color:var(--ink)}.secondary-button,.summary-grid{border:1px solid var(--line);background:var(--surface)}.summary-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr))}.summary-grid article{min-height:122px;padding:18px 20px;display:grid;grid-template-columns:28px minmax(0,1fr) 52px;grid-template-rows:auto auto;align-items:center;grid-column-gap:8px;column-gap:8px;border-right:1px solid var(--line)}.summary-grid article:last-child{border-right:0}.summary-grid article>svg{grid-row:1/span 2;color:var(--accent)}.summary-grid span{font-size:12px;color:var(--muted)}.summary-grid strong{justify-self:end;color:var(--ink);font-size:25px;font-weight:650}.summary-grid small{grid-column:2/-1;color:#98a1b2;font-size:11px}.content-section{margin-top:20px;border:1px solid var(--line);background:var(--surface)}.section-heading{min-height:64px;padding:15px 18px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.section-heading h2{margin:0;font-size:15px;font-weight:650}.section-heading p{margin:4px 0 0;color:var(--muted);font-size:11px}.workbook-list{display:grid}.workbook-row{min-height:72px;padding:12px 18px;display:grid;grid-template-columns:36px minmax(180px,1.1fr) minmax(180px,1fr) auto 34px;grid-gap:12px;gap:12px;align-items:center;border-bottom:1px solid var(--line)}.workbook-row:last-child{border-bottom:0}.file-icon{width:32px;height:32px;display:grid;place-items:center;border-radius:6px;background:var(--green-soft);color:var(--green)}.workbook-name{display:grid;grid-gap:4px;gap:4px;min-width:0}.workbook-name strong{font-size:13px}.workbook-detail,.workbook-name small{color:var(--muted);font-size:11px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.workbook-row>a{width:32px;height:32px;display:grid;place-items:center;border-radius:5px;color:var(--accent)}.workbook-row>a:hover{background:var(--accent-soft)}.access-label{width:max-content;display:inline-flex;align-items:center;gap:5px;padding:4px 7px;border-radius:5px;color:var(--green);background:var(--green-soft);font-size:10px}.two-column-section{margin-top:20px;display:grid;grid-template-columns:1fr 1fr;grid-gap:20px;gap:20px}.two-column-section>div{border:1px solid var(--line);background:var(--surface)}.empty-state{min-height:150px;padding:24px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;color:#98a1b2}.empty-state.large{min-height:320px}.empty-state strong{margin-top:9px;color:#596477;font-size:13px}.empty-state span{margin-top:5px;font-size:11px}.workbook-header{margin-bottom:14px}.security-note{min-height:44px;padding:10px 14px;display:flex;align-items:center;gap:8px;border:1px solid #cfe0ff;background:var(--accent-soft);color:#315b9d;font-size:12px}.editor-shell{position:relative;height:calc(100vh - 185px);min-height:560px;margin-top:12px;border:1px solid var(--line);background:var(--surface)}.editor-frame{width:100%;height:100%}.editor-frame.hidden{display:none}.editor-state{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;color:#7d8799;text-align:center}.editor-state strong{color:#4d596c;font-size:14px}.editor-state span{max-width:480px;font-size:12px}.spin{animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}.login-page{min-height:100vh;display:grid;place-items:center;padding:24px;background:#eef2f7}.login-panel{width:min(400px,100%);padding:30px;border:1px solid var(--line);background:var(--surface);box-shadow:var(--shadow)}.login-panel h1{margin:15px 0 5px;font-size:22px}.login-panel>div>p{margin:0;color:var(--muted);font-size:12px}.brand-mark{width:40px;height:40px;display:grid;place-items:center;border-radius:7px;background:var(--sidebar);color:#fff}.login-form{margin-top:24px;display:grid;grid-gap:14px;gap:14px}.login-form label{display:grid;grid-gap:7px;gap:7px;color:#586477;font-size:12px}.login-form input{width:100%;height:42px;padding:0 11px;border:1px solid #cfd5df;border-radius:5px;color:var(--ink);background:#fff}.login-form input:focus{outline:2px solid #b9cefa;border-color:var(--accent)}.form-message{margin:0;color:#ad2f2f;font-size:12px}@media (max-width:900px){.app-shell{grid-template-columns:68px minmax(0,1fr)}.sidebar{padding-inline:8px}.brand{justify-content:center;padding:0}.brand strong,.sidebar nav a:not(.active){font-size:0}.sidebar nav a{justify-content:center;padding:0}.sidebar nav a.active{font-size:0}.account-summary span,.nav-label{display:none}.account-summary{justify-content:center}.main-content{padding:24px 20px 40px}.workbook-row{grid-template-columns:36px 1fr auto 34px}.workbook-detail{display:none}}@media (max-width:640px){.app-shell{grid-template-columns:1fr}.sidebar{position:static;width:100%;height:auto;flex-direction:row;align-items:center;overflow-x:auto}.brand{flex:none}.sidebar nav{display:flex;margin:0 0 0 8px}.account-summary,.nav-label,.sidebar nav:nth-of-type(2){display:none}.sidebar nav a,.sidebar nav a.active{width:40px;flex:none;font-size:0}.main-content{padding:18px 14px 34px}.page-header{align-items:stretch;flex-direction:column}.page-header h1{font-size:21px}.page-header>.primary-button{width:100%}.summary-grid,.two-column-section{grid-template-columns:1fr}.summary-grid article{border-right:0;border-bottom:1px solid var(--line)}.summary-grid article:last-child{border-bottom:0}.workbook-row{grid-template-columns:34px minmax(0,1fr) 30px}.access-label{display:none}.header-actions{align-items:stretch;flex-direction:column}.secondary-button{padding-inline:9px}}