.branch-focused .learn-intro,.branch-focused .home-strip{display:none}.branch-focused .study-grid{margin-top:0}.branch-focused .chapter-heading{display:none}
.branch-title{display:flex;align-items:center;justify-content:space-between;gap:15px;margin:18px 0}.branch-title h3{font-size:25px;margin:0}
.branch-controls{display:flex;gap:15px;align-items:center;flex-wrap:wrap}.branch-controls label{display:flex;align-items:center;gap:10px;white-space:nowrap}.branch-controls output{font-size:24px;font-family:Georgia,serif;min-width:40px}.branch-controls input{flex:1;min-width:100px;accent-color:var(--ink)}.branch-operators{display:flex;gap:6px}.branch-operators .selected{background:var(--ink);color:var(--paper)}
.branch-layout{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:20px;margin-top:20px;align-items:start}.branch-scene svg{width:100%;overflow:visible}.rail{fill:none;stroke:#cad0c8;stroke-width:3;stroke-dasharray:5 7}.chosen-rail{fill:none;stroke:#718f90;stroke-width:4;opacity:0}.chosen-rail.visible{opacity:1}.station{fill:#e5e8df;stroke:#a9b9b5;stroke-width:1.5}.branch-scene text{text-anchor:middle;fill:#4c526a;font-family:inherit;font-size:13px}.branch-scene .gate-label{font-size:15px;font-weight:600}.branch-scene .station-title{font-size:12px;letter-spacing:1px}.destination{fill:#f7f3e9;stroke:#bac6c0;stroke-width:2}.destination.reached{fill:#dce6df;stroke:#728e8a}.score-token circle{fill:#4c526a;stroke:#f9f5ea;stroke-width:3}.score-token text{fill:#f9f5ea;font-size:17px;font-weight:600}.score-token{transition:transform .65s cubic-bezier(.25,.6,.3,1)}.branch-caption{min-height:54px;font-size:14px;line-height:1.6;margin:8px 0;color:var(--muted)}
.branch-code{min-width:0}.branch-code .trace-line{font-size:12px}.branch-code code{white-space:pre-wrap;overflow-wrap:anywhere}.branch-output{border-top:1px solid #5a6377;padding:14px 18px}.branch-output span{font-size:10px;letter-spacing:2px;color:#c7d9d7}.branch-output pre{background:transparent;padding:0;margin:8px 0 0;color:#f6f2e8;font-size:20px}.branch-actions{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:12px}.branch-tip{font-size:13px;color:var(--muted);margin-left:auto}
@media(max-width:900px){.branch-layout{grid-template-columns:1fr}.branch-scene{max-width:650px;margin:auto}.branch-title h3{font-size:21px}.branch-tip{width:100%;margin-left:0}}
@media(prefers-reduced-motion:reduce){.score-token{transition:none}}

.branch-layout{grid-template-columns:1fr;gap:10px}.branch-scene{max-width:700px;margin:auto}.branch-code-details summary{cursor:pointer;font-size:13px;color:var(--muted);padding:8px 0}.branch-code-details[open] .branch-code{margin-top:8px}.branch-code-details .trace-line{font-size:13px}.branch-caption{min-height:0}.branch-focused .step-footer{margin-top:20px}