:root{--bg:#f6f5f1;--rail:#f1f0eb;--surface:#fdfcf9;--ink:#292d27;--muted:#696e63;--line:#e1e2d9;--line-strong:#c9cdbf;--accent:#b94b26;--accent-hover:#a6401e;--accent-soft:#f4e6de;--green:#3f6952;--green-soft:#e7eee5;--red:#a93e3e;--red-soft:#fae8e5;--hover:#eeeee6;--tint:#eeeee7;--code-bg:#262c25;--code-ink:#edf0e6;--mono:"Cascadia Code","SFMono-Regular",Consolas,"Liberation Mono",monospace;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}:root[data-theme=dark]{--bg:#191c19;--rail:#171a17;--surface:#222721;--ink:#e8ebdf;--muted:#b0b7a7;--line:#363d32;--line-strong:#59624f;--accent:#e68e68;--accent-hover:#c87753;--accent-soft:#3b2c23;--green:#a3c6a5;--green-soft:#283d2d;--red:#efa59a;--red-soft:#3e2927;--hover:#2a3126;--tint:#20261e;--code-bg:#111710;--code-ink:#e8efdf;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}:root[data-theme=dark] .primary,:root[data-theme=dark] .choice.selected .choice-letter,:root[data-theme=dark] 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span{letter-spacing:1.1px;margin-top:7px;font-size:7px;font-weight:500;display:block}.workspace{font:9px var(--mono);letter-spacing:.5px;color:var(--muted);align-items:center;gap:7px;margin:43px 0 18px;padding:0 9px;display:flex}.status-dot{background:var(--green);border-radius:50%;width:5px;height:5px}.workspace-tag{border:1px solid var(--line);border-radius:3px;margin-left:auto;padding:2px 3px}.sidebar nav{gap:7px;display:grid}.nav-item{color:var(--muted);text-align:left;background:0 0;border:0;border-radius:7px;align-items:center;gap:13px;min-height:49px;padding:10px 16px;font-size:14px;font-weight:550;display:flex}.nav-item>span:first-child{font-family:var(--mono);font-size:21px;line-height:1}.nav-item:hover{background:var(--hover);color:var(--ink)}.nav-item.active{background:var(--accent-soft);color:var(--accent)}.rail-course{border:1px solid var(--line);border-radius:9px;gap:7px;margin-top:44px;padding:18px 16px;display:grid}.eyebrow{font-family:var(--mono);letter-spacing:1.6px;color:var(--muted);font-size:10px;font-weight:500}.rail-course strong{font-size:15px}.muted{color:var(--muted)}.rail-course>.muted{font-size:11px}.rail-course progress{margin:7px 0 11px}.offline{color:var(--muted);font-size:10px}.available{color:var(--green)}.rail-bottom{color:var(--muted);margin-top:auto;padding:35px 8px 0;font-size:10px;line-height:2}.rail-bottom span{font:9px var(--mono);letter-spacing:1px}.content{min-width:0}.topbar{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:12px;height:78px;padding:0 48px;display:flex}.crumb{color:var(--muted);font-size:11px}.crumb span{color:var(--line-strong);padding:0 15px}.top-actions{align-items:center;gap:19px;display:flex}.network{font:9px var(--mono);letter-spacing:1.1px;color:var(--green)}.icon-btn{border:1px solid var(--line);width:36px;height:36px;color:var(--ink);background:0 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