:root{color-scheme:light;--bg: #f5f6f3;--ink: #151818;--muted: #63706a;--line: #dbe1dc;--accent: #22b51d;--accent-2: #101313;--surface: #ffffff;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{min-height:100vh;margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:var(--ink);background:var(--bg)}button,input,select{font:inherit}h1,h2,h3,p{margin:0}.boot-screen{min-height:100vh;background:#000}.landing-page{--bg: #000;--ink: #f4f7f5;--muted: #b9c5bf;--line: rgba(255, 255, 255, .12);--surface: rgba(5, 8, 7, .68);min-height:100vh;height:100vh;overflow:hidden;display:flex;flex-direction:column;background:#000;color:var(--ink);position:relative;isolation:isolate}.landing-page:before{content:"";position:fixed;inset:0;z-index:0;pointer-events:none;background:radial-gradient(circle at 16% 34%,rgba(255,255,255,.2) 0,rgba(172,178,176,.1) 15%,transparent 29%),radial-gradient(circle at 78% 58%,rgba(205,211,209,.16) 0,rgba(116,122,120,.08) 16%,transparent 31%),radial-gradient(circle at 46% 82%,rgba(238,242,240,.08) 0,rgba(180,186,184,.04) 14%,transparent 29%),#000;background-size:150% 150%,135% 135%,180% 180%,100% 100%;background-position:0% 42%,100% 58%,48% 100%,0 0;animation:fallback-gradient 20s ease-in-out infinite alternate}.topbar,.landing-main,.site-footer{position:relative;z-index:1}.topbar{flex:0 0 auto;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:24px 32px 10px;background:transparent}.brand{display:inline-flex;align-items:center;flex:0 1 276px;min-width:198px}.brand img{display:block;width:min(276px,55vw);max-height:min(87px,11vh);height:auto;object-fit:contain}nav{display:flex;gap:10px;align-items:center;justify-content:flex-end}.nav-link{border:0;background:transparent;color:#fff;font-weight:800;cursor:pointer}.landing-main{width:min(100%,1120px);margin:0 auto;padding:8px 18px;flex:1 1 auto;min-height:0;display:grid;grid-template-columns:minmax(0,1fr);align-content:center;justify-items:start;gap:22px}.hero{display:grid;align-content:center;padding:12px 0 8px}.hero h1{max-width:680px;color:#fff;font-size:clamp(2.2rem,8vw,4.6rem);line-height:.94;letter-spacing:0;text-wrap:balance;margin:0 0 16px}.hero p{max-width:720px;color:var(--muted);font-size:1.08rem;line-height:1.5;margin:0 0 14px}.button,.plain-button{border:0;border-radius:8px;min-height:42px;padding:11px 14px;color:#fff;background:var(--accent);font-weight:800;cursor:pointer;white-space:nowrap}.button:disabled{opacity:.72;cursor:wait}.button-primary{background:#22b51d;color:#041004}.button-secondary{background:#ffffff1a;color:#fff;border:1px solid rgba(255,255,255,.14)}.auth-panel .button-secondary{background:#111514;color:#fff;border:0}.auth-panel{--ink: #111514;--line: #cfd8d1;width:100%;justify-self:stretch;background:#fff;color:#111514;border:1px solid #cfd8d1;border-radius:8px;padding:16px;box-shadow:0 18px 70px #0000003d}.auth-form{display:grid;gap:12px}.auth-panel label{color:#222827}label{display:grid;gap:6px;color:var(--muted);font-weight:700}input,select{width:100%;min-height:42px;border:1px solid var(--line);border-radius:8px;padding:9px 10px;color:var(--ink);background:#fff}.auth-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px}.error{color:#a02727;font-weight:800}.notice{color:#14602c;font-weight:800}.site-footer{flex-shrink:0;display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:8px;padding:8px 18px 12px;color:var(--muted);font-size:.92rem}.site-footer button{border:0;padding:0;color:var(--muted);background:transparent;font:inherit;font-weight:700;cursor:pointer}.legal-panel{grid-column:1 / -1;width:min(800px,calc(100vw - 36px));justify-self:center;max-height:min(68vh,720px);overflow:auto;background:#040907b8;border:1px solid rgba(255,255,255,.12);border-radius:8px;padding:24px;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);font-size:1.08rem}.legal-panel h1{color:#fff;font-size:clamp(2rem,8vw,3.4rem);line-height:1;margin-bottom:18px}.legal-panel h2{color:#fff;margin-top:22px}.legal-panel p,.legal-panel li{color:#d6dfda;line-height:1.55;margin:10px 0}.app-shell{min-height:100vh;height:100vh;display:grid;grid-template-columns:292px minmax(0,1fr);grid-template-rows:52px minmax(0,1fr);overflow:hidden;background:#232729;color:#eef2f0}.app-topbar{grid-column:1 / -1;min-width:0;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:8px 12px;background:#2d3135;border-bottom:1px solid #454b50}.app-topbar-left{display:flex;align-items:center;gap:14px;min-width:0}.account-menu-button{border:1px solid #555d64;border-radius:5px;background:#383e43;color:#eef2f0;min-height:34px;cursor:pointer}.app-logo{width:142px;height:auto;display:block}.tab-strip{min-width:0;display:flex;gap:8px;overflow:hidden;-webkit-user-select:none;user-select:none}.workspace-tab{border:1px solid #4b5359;border-radius:5px;min-height:34px;padding:0 3px 0 13px;color:#dfe5e2;background:#343a3f;font-weight:800;white-space:nowrap;display:inline-flex;align-items:center;gap:10px;cursor:pointer;-webkit-user-select:none;user-select:none}.workspace-tab-title{color:inherit}.tab-close{width:34px;align-self:stretch;border:0;border-left:1px solid transparent;border-radius:4px;background:transparent;color:#c8d0cc;font-size:1.1rem;line-height:1;font-weight:900;cursor:pointer}.workspace-tab:hover .tab-close{background:#ffffff14;border-left-color:#ffffff1a;color:#fff}.tab-close:hover{background:#7b2e35;color:#fff}.workspace-tab.active{border-color:#7b858c;background:#485057;color:#fff}.workspace-tab.dragging{opacity:.48}.account-menu{position:relative;flex:0 0 auto}.account-menu-button{width:42px;display:grid;place-items:center;padding:0;font-weight:800}.burger-lines{display:grid;gap:4px;width:20px}.burger-lines span{height:2px;background:#eef2f0}.account-popover{position:absolute;right:0;top:calc(100% + 8px);z-index:5;width:260px;padding:10px;background:#f7f8f6;color:#151818;border:1px solid #c6ceca;border-radius:6px;box-shadow:0 18px 50px #00000059}.account-popover p{color:#515b56;margin-bottom:8px;overflow-wrap:anywhere}.account-popover button{width:100%;min-height:38px;border:1px solid #c6ceca;border-radius:5px;background:#fff;color:#151818;font-weight:800;cursor:pointer}.sidebar{grid-column:1;grid-row:2;min-height:0;overflow:auto;background:#2b3034;border-right:1px solid #454b50;padding:14px 10px}h2{font-size:13px;text-transform:uppercase;color:#66736a;margin-bottom:8px;letter-spacing:0}.workspace{grid-column:2;grid-row:2;min-width:0;min-height:0;display:flex;flex-direction:column;background:#eef1ed;color:#151818}.tree-view{display:block}.tree-view details{margin-left:8px}.tree-view summary{min-height:30px;padding:6px 8px;border-radius:5px;color:#eef2f0;font-weight:800;cursor:pointer;list-style-position:outside}.tree-view summary:hover{background:#383f44}.tree-view summary button{display:inline;width:calc(100% - 20px);min-height:26px;margin-left:4px;font-weight:800}.tree-view ul{list-style:none;margin:4px 0 8px 18px;padding:0;display:grid;gap:3px}.tree-view button{width:100%;min-height:30px;padding:5px 8px;border:0;border-radius:5px;text-align:left;color:#dfe6e2;background:transparent;cursor:pointer}.tree-view button:hover,.tree-view button.selected{background:#485057;color:#fff}.toolbar{min-height:62px;border-bottom:1px solid #ccd4cf;background:#fff;padding:10px 18px;display:flex;align-items:center;justify-content:flex-start;gap:12px}.toolbar div{display:flex;gap:12px;align-items:baseline}.toolbar span,.muted{color:#66736a}.toolbar button{border:1px solid #cbd3ca;background:#fff;border-radius:6px;min-height:36px;padding:0 12px}.toolbar select{width:180px;min-height:36px}.content-panel{min-height:0;overflow:auto;padding:22px;display:grid;align-content:start;gap:18px}.content-header{display:grid;gap:5px}.content-header-row{grid-template-columns:minmax(0,1fr) auto;align-items:start}.content-header h1{font-size:1.8rem;line-height:1.1;letter-spacing:0}.content-header p{color:#66736a}.icon-button{width:38px;min-height:38px;border:1px solid #cbd3ca;border-radius:6px;background:#fff;color:#202528;font-size:1.35rem;font-weight:900;cursor:pointer}.icon-button:hover{background:#f1f4f1}.modal-backdrop{position:fixed;inset:0;z-index:20;display:grid;place-items:center;background:#00000047}.course-dialog{width:min(420px,calc(100vw - 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