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.rf-rail{flex-direction:column;gap:.4rem;display:flex}@media (width<=760px){.pc-theme-railforge .rf-rail{flex-flow:wrap}}.pc-theme-railforge .rf-cs{text-align:left;border:1px solid var(--rf-outline);background:var(--rf-card);min-height:44px;color:var(--rf-ink);cursor:pointer;border-radius:10px;align-items:center;gap:.45rem;padding:.4rem .6rem;font-size:.82rem;display:flex}.pc-theme-railforge .rf-cs:hover{border-color:var(--rf-accent)}.pc-theme-railforge .rf-cs:focus-visible{outline:3px solid color-mix(in srgb, var(--rf-accent) 55%, transparent);outline-offset:1px}.pc-theme-railforge .rf-cs.is-current{border-color:var(--rf-accent);box-shadow:inset 0 0 0 2px var(--rf-accent)}.pc-theme-railforge .rf-cs-t{flex:1}.pc-theme-railforge .rf-cs-tier,.pc-theme-railforge .rf-concept-chip{white-space:nowrap;background:color-mix(in srgb, var(--rf-accent) 14%, transparent);color:var(--rf-accent);border-radius:6px;align-items:center;padding:.1rem .4rem;font-size:.66rem;font-weight:800;display:inline-flex}.pc-theme-railforge .rf-tier--easy{background:color-mix(in srgb, var(--rf-ok) 18%, transparent);color:var(--rf-ok)}.pc-theme-railforge .rf-tier--hard{background:color-mix(in srgb, var(--rf-err) 18%, transparent);color:var(--rf-err)}.pc-theme-railforge .rf-cs.is-solved .rf-cs-tier{background:color-mix(in srgb, var(--rf-ok) 20%, transparent);color:var(--rf-ok)}.pc-theme-railforge .rf-cs-ok{color:var(--rf-ok);font-weight:900}.pc-theme-railforge .rf-concept{background:var(--rf-card);border:1px solid var(--rf-outline);border-left:3px solid var(--rf-accent);border-radius:10px;flex-wrap:wrap;align-items:center;gap:.5rem;margin-bottom:.7rem;padding:.7rem .9rem;display:flex}.pc-theme-railforge .rf-concept-name{color:var(--rf-muted);font-size:.82rem;font-weight:700}.pc-theme-railforge .rf-concept-txt{flex-basis:100%;margin:.3rem 0 0;font-size:1rem;line-height:1.5}.pc-theme-railforge .rf-track{background:var(--rf-panel);border:1px solid var(--rf-outline);border-radius:10px;flex-wrap:wrap;align-items:center;gap:.6rem;margin:0 0 .7rem;padding:.55rem .8rem;display:flex}.pc-theme-railforge .rf-track-lbl{color:var(--rf-muted);font-size:.84rem;font-weight:700}.pc-theme-railforge .rf-codefig{margin:0 0 .7rem}.pc-theme-railforge .rf-codefig figcaption{color:var(--rf-muted);margin-bottom:.4rem;font-size:.82rem;font-weight:700}.pc-theme-railforge .rf-code{background:var(--rf-code-bg);border:1px solid var(--rf-outline);white-space:pre;border-radius:12px;margin:0;padding:.7rem .8rem;font-size:.98rem;line-height:1.55;overflow-x:auto}.pc-theme-railforge .rf-svg{display:block}.pc-theme-railforge .rf-cell{fill:var(--rf-cell-bg);stroke:var(--rf-cell-line);stroke-width:1px}.pc-theme-railforge .rf-cell--wall{fill:var(--rf-wall)}.pc-theme-railforge .rf-ore{fill:var(--rf-ore);stroke:none}.pc-theme-railforge .rf-start{fill:none;stroke:var(--rf-muted);stroke-width:2px}.pc-theme-railforge .rf-path{fill:none;stroke:var(--rf-accent);stroke-width:3px;stroke-linecap:round;stroke-linejoin:round}.pc-theme-railforge .rf-cart{fill:var(--rf-accent);stroke:var(--rf-card);stroke-width:1.5px}.pc-theme-railforge .rf-cart--ore{fill:var(--rf-ok)}.pc-theme-railforge .rf-step-h{color:var(--rf-accent);margin:0 0 .2rem;font-size:1.02rem}.pc-theme-railforge .rf-step-sub{color:var(--rf-muted);margin:0 0 .55rem;font-size:.92rem;line-height:1.5}.pc-theme-railforge .rf-choices{grid-template-columns:repeat(2,1fr);gap:.6rem;display:grid}@media (width>=560px){.pc-theme-railforge .rf-choices{grid-template-columns:repeat(4,1fr)}}.pc-theme-railforge .rf-choice{border:1px solid var(--rf-outline);background:var(--rf-card);cursor:pointer;border-radius:12px;justify-content:center;align-items:center;min-height:44px;padding:.5rem;display:flex}.pc-theme-railforge .rf-choice:hover{border-color:var(--rf-accent);background:color-mix(in srgb, var(--rf-accent) 8%, var(--rf-card))}.pc-theme-railforge .rf-choice:focus-visible{outline:3px solid color-mix(in srgb, var(--rf-accent) 55%, transparent);outline-offset:1px}.pc-theme-railforge .rf-choice .rf-svg{width:100%;height:auto}.pc-theme-railforge .rf-verdict{margin-top:.9rem}.pc-theme-railforge .rf-verdict.is-neutral{background:var(--rf-panel);border:1px solid var(--rf-outline);border-radius:12px;padding:.8rem .9rem}.pc-theme-railforge .rf-verdict.is-ok{background:color-mix(in srgb, var(--rf-ok) 12%, var(--rf-card));border:1px solid color-mix(in srgb, var(--rf-ok) 45%, transparent);border-radius:12px;padding:.8rem .9rem}.pc-theme-railforge .rf-v-title{margin:0 0 .5rem;font-weight:800}.pc-theme-railforge .rf-verdict.is-ok .rf-v-title{color:var(--rf-ok)}.pc-theme-railforge .rf-v-cmp{flex-wrap:wrap;gap:1rem;display:flex}.pc-theme-railforge .rf-v-cmp>div{flex:0 auto}.pc-theme-railforge .rf-v-lbl{color:var(--rf-muted);text-transform:uppercase;letter-spacing:.03em;margin-bottom:.25rem;font-size:.74rem;font-weight:800;display:block}.pc-theme-railforge .rf-v-draw{background:var(--rf-code-bg);border:1px solid var(--rf-outline);border-radius:10px;padding:.4rem;display:inline-block}.pc-theme-railforge .rf-v-draw--big{width:max-content;max-width:100%;display:block}.pc-theme-railforge .rf-v-hint{color:var(--rf-muted);margin:.5rem 0 0;font-size:.9rem;line-height:1.5}.pc-theme-railforge .rf-v-why{color:var(--rf-muted);margin:.6rem 0 0;font-size:.9rem;line-height:1.5}.pc-theme-railforge .rf-v-par{color:var(--rf-muted);margin:.4rem 0 0;font-size:.84rem;line-height:1.5}.pc-theme-railforge .rf-btn{border:1px solid var(--rf-accent);background:color-mix(in srgb, var(--rf-accent) 12%, var(--rf-card));min-height:44px;color:var(--rf-accent);cursor:pointer;border-radius:10px;margin-top:.6rem;padding:.5rem 1rem;font-size:.95rem;font-weight:800}.pc-theme-railforge .rf-btn:hover{background:color-mix(in srgb, var(--rf-accent) 20%, var(--rf-card))}.pc-theme-railforge .rf-btn:focus-visible{outline:3px solid color-mix(in srgb, var(--rf-accent) 55%, transparent);outline-offset:1px}.pc-theme-railforge .rf-ref-list{gap:.8rem;margin:0;padding:0;list-style:none;display:grid}@media (width>=700px){.pc-theme-railforge .rf-ref-list{grid-template-columns:1fr 1fr}}.pc-theme-railforge .rf-ref-card{background:var(--rf-card);border:1px solid var(--rf-outline);border-radius:12px;padding:.9rem 1rem}.pc-theme-railforge .rf-ref-name{color:var(--rf-accent);font-weight:800}.pc-theme-railforge .rf-ref-gloss{color:var(--rf-ink);margin:.35rem 0 0;font-size:.92rem;line-height:1.5}.pc-theme-railforge .rf-ref-h2{margin:1.4rem 0 .6rem;font-size:1.2rem}.pc-theme-railforge .rf-edge-list{gap:.5rem;margin:0;padding:0;list-style:none;display:grid}.pc-theme-railforge .rf-edge{background:var(--rf-panel);border:1px solid var(--rf-outline);border-radius:10px;flex-wrap:wrap;gap:.5rem;padding:.5rem .8rem;display:flex}.pc-theme-railforge .rf-edge-k{color:var(--rf-accent);min-width:12rem;font-weight:800}.pc-theme-railforge .rf-edge-why{color:var(--rf-muted);flex:1;font-size:.9rem}.pc-theme-railforge.pc-immersive{--pc-env-bg:radial-gradient(120% 90% at 50% 6%, #e7eff9 0%, #bed5ef 42%, #0000 72%), linear-gradient(to bottom, #dae7f6 0%, #9dc0e7 46%, #689dd9 76%, #3b80ce 100%);--pc-env-bg-dark:radial-gradient(120% 90% at 50% 6%, #12283f 0%, #0b1928 46%, #0000 74%), linear-gradient(to bottom, #102337 0%, #0b1928 52%, #070f18 100%);--pc-env-bg-flat:oklab(84.9086% -.0156667 -.0468817);--pc-env-bg-flat-dark:#0b1928}