.rb-sim{--sim-bg:#fffdf9;--sim-grid:#f1e8dc;--sim-a:#0f766e;--sim-track:#2a1a12;--ink:#2a1a12;--mute:#6b5848;--line:#dccbb7;--gold:#b7791f;--red:#c43d36;--green:#2f8a57;--sky:#2c6cb0}:root[data-theme=dark] .rb-sim{--sim-bg:#1f150f;--sim-grid:#2e2018;--sim-a:#5eead4;--sim-track:#f6ece2;--ink:#f6ece2;--mute:#c4ad99;--line:#574032;--gold:#e0b14a;--red:#ec6b60;--green:#52c086;--sky:#6ea7e8}@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .rb-sim{--sim-bg:#1f150f;--sim-grid:#2e2018;--sim-a:#5eead4;--sim-track:#f6ece2;--ink:#f6ece2;--mute:#c4ad99;--line:#574032;--gold:#e0b14a;--red:#ec6b60;--green:#52c086;--sky:#6ea7e8}}.rb-sim{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm);min-width:0;padding:20px}.rb-sim-head h3{margin:0;font-size:1.15rem}.rb-sim-head p{color:var(--muted);max-width:78ch;margin:4px 0 14px;font-size:.93rem}.rb-sim-body{grid-template-columns:minmax(0,1fr) 270px;align-items:start;gap:20px;display:grid}@media (max-width:900px){.rb-sim-body{grid-template-columns:minmax(0,1fr)}}.rb-sim .sim-canvas{border:1px solid var(--border);touch-action:none;background:var(--sim-bg);border-radius:8px;width:100%;max-width:100%;height:auto;display:block}.rb-sim .ctrl{flex-direction:column;gap:13px;display:flex}.rb-sim .sl{flex-direction:column;gap:4px;font-size:.85rem;display:flex}.rb-sim .sl-h{color:var(--muted);justify-content:space-between;gap:8px;display:flex}.rb-sim output{color:var(--text);font-variant-numeric:tabular-nums;font-weight:700}.rb-sim input[type=range]{width:100%;accent-color:var(--k-devre);margin:0}.rb-sim select{font:inherit;border:1px solid var(--border-strong);background:var(--surface);color:var(--text);border-radius:8px;padding:7px 8px;font-size:.88rem}.rb-sim .ck{align-items:center;gap:8px;font-size:.88rem;display:flex}.rb-sim .ck input{accent-color:var(--k-devre);width:16px;height:16px}.rb-sim .row{flex-wrap:wrap;gap:8px;display:flex}.rb-sim .sbtn{font:inherit;border:1px solid var(--primary);background:var(--primary);color:var(--primary-ink);cursor:pointer;border-radius:999px;padding:8px 14px;font-size:.88rem;font-weight:700}.rb-sim .sbtn.ghost{color:var(--text);border-color:var(--border-strong);background:0 0}.rb-sim .readout{font-variant-numeric:tabular-nums;background:var(--surface-2);border:1px solid var(--border);white-space:pre-wrap;color:var(--text);border-radius:8px;padding:10px 12px;font-size:.84rem;line-height:1.6}.rb-sim .readout.log{overflow-wrap:anywhere;min-height:150px;font:.75rem/1.55 ui-monospace,JetBrains Mono,Menlo,Consolas,monospace}.rb-hero{grid-template-columns:auto minmax(0,1fr);align-items:start;gap:24px 32px;display:grid}.rb-code-big{font-family:var(--mono);color:var(--eng);letter-spacing:-.02em;margin:0;font-size:clamp(2.6rem,7vw,4.6rem);font-weight:800;line-height:.9}.rb-hero h1{margin:0 0 4px}.rb-meta{color:var(--muted);margin:0 0 12px;font-size:.92rem}.rb-actions{flex-wrap:wrap;gap:8px;margin:16px 0 0;display:flex}@media (max-width:700px){.rb-hero{grid-template-columns:minmax(0,1fr)}}.rb-scroll{overflow-x:auto}.rb-table{border-collapse:collapse;width:100%;font-size:.93rem}.rb-table th,.rb-table td{border-bottom:1px solid var(--border);text-align:left;vertical-align:top;padding:10px 12px}.rb-table th{color:var(--muted);text-transform:uppercase;letter-spacing:.06em;font-size:.78rem;font-weight:700}.rb-table .n{font-family:var(--mono);color:var(--eng);width:44px;font-size:1.1rem;font-weight:800}.rb-table a{color:var(--text);font-weight:700}.rb-table .rb-tcell{color:var(--muted);font-size:.86rem}.rb-table tr.exam td{background:var(--warn-soft)}.rb-two{grid-template-columns:repeat(auto-fit,minmax(min(100%,340px),1fr));gap:16px;display:grid}.rb-grade{gap:4px;margin-bottom:12px;display:flex}.rb-grade div{background:var(--eng-soft);color:var(--eng);border-radius:8px;padding:10px 12px;display:grid}.rb-grade div+div{background:var(--primary-soft);color:var(--primary)}.rb-grade b{font-family:var(--mono);font-size:1.3rem}.rb-grade span{font-size:.8rem;font-weight:700}.rb-week{grid-template-columns:250px minmax(0,1fr);align-items:start;gap:40px;display:grid}.rb-side{top:calc(var(--topbar-h) + 16px);max-height:calc(100vh - var(--topbar-h) - 32px);position:sticky;overflow-y:auto}.rb-side ol{gap:2px;display:grid}.rb-side a{color:var(--text);border-radius:8px;grid-template-columns:28px minmax(0,1fr);gap:6px;padding:7px 10px;font-size:.86rem;line-height:1.3;display:grid}.rb-side a:hover{background:var(--surface-2);text-decoration:none}.rb-side a .k{font-family:var(--mono);color:var(--eng);font-weight:800}.rb-side a.on{background:var(--eng);color:var(--surface)}.rb-side a.on .k{color:var(--surface)}@media (max-width:960px){.rb-week{grid-template-columns:minmax(0,1fr);gap:16px}.rb-side{max-height:none;position:static}.rb-side ol{gap:6px;padding-bottom:6px;display:flex;overflow-x:auto}.rb-side li{flex:none}.rb-side a{border:1px solid var(--border);border-radius:999px;grid-template-columns:auto;padding:6px 12px}.rb-side a span:not(.k){display:none}}.rb-art{min-width:0;max-width:860px}.rb-art>h1{text-wrap:balance;margin:0 0 6px}.rb-art>h2{margin:36px 0 12px}.rb-of{color:var(--muted);font-size:.9rem;font-family:var(--mono);margin:0}.rb-tools{color:var(--muted);margin:0 0 8px}.rb-prose{line-height:1.7}.rb-prose h2{margin:36px 0 10px;font-size:1.3rem}.rb-prose h3{margin:26px 0 8px;font-size:1.08rem}.rb-prose ul{gap:4px;margin:0 0 1em;padding-left:22px;list-style:outside;display:grid}.rb-prose code{font-family:var(--mono);background:var(--surface-2);border-radius:5px;padding:1px 5px;font-size:.88em}.rb-prose .eq{background:var(--surface);border-left:3px solid var(--eng);white-space:nowrap;border-radius:0 8px 8px 0;margin:12px 0 16px;padding:10px 16px;font-family:Georgia,Times New Roman,serif;font-size:1.12rem;font-style:italic;overflow-x:auto}.rb-prose .scroll{margin:8px 0 16px;overflow-x:auto}.rb-prose table{border-collapse:collapse;width:100%;font-size:.9rem}.rb-prose th,.rb-prose td{border-bottom:1px solid var(--border);text-align:left;vertical-align:top;padding:8px 10px}.rb-prose th{color:var(--muted);font-size:.78rem}.rb-sims{gap:20px;display:grid}.rb-hw-box{border-radius:var(--radius);background:var(--eng-soft);border:1px solid color-mix(in srgb, var(--eng) 30%, var(--border));margin-top:24px;padding:16px 20px}.rb-hw-box h2{margin:0 0 10px;font-size:1rem}.rb-code{margin:0 0 16px}.rb-code figcaption{color:var(--muted);justify-content:space-between;align-items:center;gap:12px;margin-bottom:6px;font-size:.86rem;display:flex}.rb-code button{font:inherit;border:1px solid var(--border-strong);background:var(--surface);color:var(--text);cursor:pointer;border-radius:999px;padding:4px 12px;font-size:.8rem;font-weight:700}.rb-code pre{background:var(--code-bg);color:var(--code-text);tab-size:4;border-radius:12px;margin:0;padding:16px 18px;font:.82rem/1.6 ui-monospace,JetBrains Mono,Menlo,Consolas,monospace;overflow-x:auto}.rb-box{background:var(--surface);border:1px solid var(--border);border-left:4px solid var(--eng);border-radius:8px;margin:20px 0;padding:16px 20px}.rb-box h3{margin:0 0 6px}.rb-box p{margin:0 0 8px}.rb-box-hw{border-left-color:var(--primary)}.rb-links{flex-wrap:wrap;gap:6px 16px;font-size:.9rem;font-weight:700;display:flex}.rb-pager{border-top:1px solid var(--border);justify-content:space-between;gap:12px;margin-top:44px;padding-top:20px;display:flex}.rb-pager a{color:var(--text);font-weight:700}.rb-pager a.r{text-align:right}.rb-pager small{color:var(--muted);font-weight:400;display:block}.rb-kitbox{margin:28px 0 8px}.rb-kitbox h2{margin:0 0 6px;font-size:1.1rem}.rb-steps{gap:6px;padding-left:22px;list-style:decimal;display:grid}.rb-small{font-size:.85rem}.rb-milestones{gap:10px;display:grid}.rb-milestones li{border:1px solid var(--border);background:var(--surface);border-radius:12px;grid-template-columns:90px minmax(0,1fr);gap:12px;padding:12px 14px;display:grid}.rb-milestones p{margin:2px 0}.rb-ms-week{font-family:var(--mono);color:var(--eng);font-weight:800}.rb-proj-step{border:1px dashed color-mix(in srgb, var(--primary) 45%, var(--border));background:var(--primary-soft);border-radius:12px;margin:20px 0;padding:14px 18px}.rb-proj-step h3{margin:0 0 8px;font-size:1rem}.rb-proj-step ul{gap:6px;display:grid}.rb-proj-step li{font-size:.92rem}.eng .part-main>*,.rb-code,.rb-art>*{min-width:0}.rb-code pre{max-width:100%}.rb-pitfalls,.rb-se{border-radius:var(--radius);margin:28px 0;padding:16px 20px}.rb-pitfalls{background:var(--warn-soft)}.rb-pitfalls h2,.rb-se h2{margin:0 0 10px;font-size:1.05rem}.rb-pitfalls h2{color:var(--warn)}.rb-pitfalls ul{gap:6px;padding-left:20px;list-style:outside;display:grid}.rb-se{background:var(--surface-2);border:1px solid var(--border)}.rb-quiz{border-radius:var(--radius);border:1px solid color-mix(in srgb, var(--eng) 35%, var(--border));background:var(--surface);margin:32px 0;padding:20px 24px}.rb-quiz h2{margin:0 0 12px;font-size:1.15rem}.rb-quiz ol{gap:18px;padding-left:22px;list-style:decimal;display:grid}.rb-q{margin:0 0 8px;font-weight:700}.rb-opts{gap:6px;display:grid}.rb-opt{text-align:left;font:inherit;border:1px solid var(--border-strong);background:var(--surface);color:var(--text);cursor:pointer;border-radius:10px;align-items:flex-start;gap:10px;padding:9px 12px;font-size:.93rem;display:flex}.rb-opt:hover:not(:disabled){border-color:var(--eng)}.rb-opt:disabled{cursor:default}.rb-opt.ok{background:var(--ok-soft);border-color:var(--ok)}.rb-opt.bad{background:var(--warn-soft);border-color:var(--warn)}.rb-opt.dim{opacity:.6}.rb-opt-k{font-family:var(--mono);color:var(--eng);font-weight:800}.rb-why{margin:8px 0 0;font-size:.9rem}.rb-why.ok{color:var(--ok)}.rb-why.bad{color:var(--warn)}.rb-score{font-weight:800;font-family:var(--mono);align-items:center;gap:12px;margin:16px 0 0;display:flex}.rb-score button{font:inherit;font-family:var(--font-sans,inherit);border:1px solid var(--border-strong);background:var(--surface);color:var(--text);cursor:pointer;border-radius:999px;padding:6px 14px;font-size:.85rem;font-weight:700}