.rq-band-chip{letter-spacing:.02em;color:var(--ff-forge-text);background:var(--ff-warm);border:2px solid var(--ff-outline);border-radius:999px;margin:0 0 .6rem;padding:.3rem .7rem;font-size:.8rem;font-weight:800;display:inline-block}.rq-featured{border-top:6px solid var(--pc-select);margin-bottom:1rem}.rq-cta{background:var(--ff-forge);color:#fff;border-color:var(--ff-forge);padding:.7rem 1.1rem;font-size:1.05rem;display:inline-block}.rq-cast{gap:.4rem;margin:.7rem 0 0;padding:0;list-style:none;display:grid}.rq-cast-item{color:var(--ff-anvil);background:var(--ff-warm);border:2px solid var(--ff-outline);border-radius:10px;padding:.5rem .7rem;font-size:.95rem;line-height:1.4}.rq-cast-item strong{color:var(--ff-forge-text)}.rq-kits{gap:.55rem;display:grid}.rq-kit{text-align:left;min-height:44px;display:block}.rq-h{margin:0 0 .35rem;font-size:1.5rem}.rq-introcard{border-top:6px solid var(--pc-select)}.rq-modes{flex-wrap:wrap;gap:.7rem;margin-top:1rem;display:flex}.rq-topic{text-transform:uppercase;letter-spacing:.04em;opacity:.8;color:var(--ff-forge-text);border:2px solid var(--ff-outline);background:var(--ff-warm);border-radius:999px;margin:0 0 .6rem;padding:.2rem .5rem;font-size:.74rem;font-weight:800;display:inline-block}.rq-stem{color:var(--ff-anvil);align-items:baseline;gap:.1rem;margin:0 0 .9rem;font-size:1.12rem;font-weight:800;line-height:1.45;display:flex}.rq-stem-bar{background:var(--pc-select);border-radius:3px;align-self:stretch;width:6px;margin-right:.5rem;display:inline-block}.rq-choices{grid-template-columns:1fr 1fr;gap:.6rem;display:grid}.rq-choice{text-align:center;cursor:pointer;font-variant-numeric:tabular-nums;background:var(--ff-paper);border:2px solid var(--ff-outline);width:100%;min-height:52px;box-shadow:3px 3px 0 var(--ff-outline);color:var(--ff-anvil);border-radius:12px;padding:.8rem .85rem;font-size:1.1rem;font-weight:800;transition:transform 80ms,box-shadow 80ms;display:block}.rq-choice:hover{box-shadow:4px 4px 0 var(--ff-outline);transform:translate(-1px,-1px)}.rq-choice:active{box-shadow:1px 1px 0 var(--ff-outline);transform:translate(1px,1px)}.rq-choice:focus-visible{outline:3px solid var(--ff-focus);outline-offset:2px}.rq-choice[disabled]{cursor:default;opacity:.92}.rq-choice--correct{border-color:var(--pc-correct);border-left:6px solid var(--pc-correct);background:var(--pc-correct-bg)}.rq-choice--wrong{border-color:var(--pc-incorrect);border-left:6px solid var(--pc-incorrect);background:var(--pc-incorrect-bg)}.rq-feedback{margin-top:.9rem}.rq-feedback:empty{display:none}.rq-feedback{border-left:6px solid var(--ff-outline);padding-left:.8rem}.rq-feedback--ok{border-left-color:var(--pc-correct)}.rq-feedback--no{border-left-color:var(--pc-select)}.rq-verdict{color:var(--ff-anvil);margin:0 0 .5rem;font-size:1.05rem;font-weight:800}.rq-why{color:var(--ff-anvil);margin:.6rem 0 0;font-size:1rem;line-height:1.5}.rq-runout{margin:.4rem 0 0}.rq-runout-label{text-transform:uppercase;letter-spacing:.04em;opacity:.8;color:var(--ff-forge-text);margin-bottom:.2rem;font-size:.72rem;font-weight:800;display:inline-block}.rq-runout-val{font-variant-numeric:tabular-nums;color:var(--ff-anvil);background:var(--ff-paper);border:2px solid var(--ff-outline);border-radius:8px;margin:0;padding:.4rem .8rem;font-size:1.5rem;font-weight:800;display:inline-block}.rq-progress{background:var(--ff-warm);border:2px solid var(--ff-outline);border-radius:999px;height:8px;margin:0 0 .9rem;overflow:hidden}.rq-progress-fill{background:var(--pc-select);height:100%;transition:width .2s}.rq-next{min-height:44px}.rq-results{border-top:6px solid var(--pc-select)}.rq-score{color:var(--ff-forge-text);font-variant-numeric:tabular-nums;margin:.3rem 0;font-size:1.3rem;font-weight:800}@media (width<=520px){.rq-choices{grid-template-columns:1fr}}@media (prefers-reduced-motion:reduce){.rq-choice,.rq-choice:hover,.rq-choice:active{transition:none;transform:none}.rq-progress-fill{transition:none}}.rq-band{justify-content:space-between;align-items:baseline;margin:.4rem 0 .6rem;display:flex}.rq-band-title{color:var(--ff-forge-text);font-weight:800}.rq-context{margin-bottom:.5rem}.rq-eqbox{background:var(--ff-warm);border:2px solid var(--ff-outline);text-align:center;border-radius:.7rem;margin:.4rem 0 .7rem;padding:.75rem .85rem}.rq-eq{letter-spacing:.01em;color:var(--ff-forge-text);font-variant-numeric:tabular-nums;font-size:1.28rem;font-weight:800}.rq-eqtags{margin-top:.4rem}.rq-tag{border:1.5px solid var(--ff-outline);border-radius:999px;padding:.16rem .5rem;font-size:.72rem;font-weight:700;display:inline-block}.rq-tag--exothermic{background:color-mix(in oklab, #c2410c 16%, var(--ff-paper));color:var(--ff-forge-text)}.rq-tag--endothermic{background:color-mix(in oklab, #2563eb 16%, var(--ff-paper));color:var(--ff-forge-text)}.rq-arrow{margin-top:.5rem;font-size:.95rem;font-weight:800}.rq-arrow--left,.rq-arrow--right{color:var(--ff-forge-text)}.rq-arrow--none{color:var(--ff-forge-text);opacity:.75}.rq-stem{align-items:flex-start;gap:.5rem;display:flex}.rq-stem-bar{background:var(--pc-select);border-radius:3px;flex:none;align-self:stretch;width:5px}.rq-prompt{font-weight:700}.rq-options{gap:.55rem;margin-top:.3rem;display:grid}.rq-option{text-align:center;border:2px solid var(--ff-outline);background:var(--ff-paper);min-height:44px;color:var(--ff-forge-text);cursor:pointer;border-radius:.6rem;padding:.75rem .85rem;font-size:.98rem;font-weight:600;transition:border-color .14s,transform .14s}.rq-option:hover{border-color:var(--pc-select);transform:translateY(-1px)}.rq-option:focus-visible{outline:3px solid var(--pc-select);outline-offset:2px}.rq-badge{border:2px solid var(--ff-outline);border-radius:.5rem;padding:.28rem .6rem;font-size:.86rem;font-weight:800;display:inline-block}.rq-badge--right{background:color-mix(in oklab, var(--pc-correct,#2e7d54) 22%, var(--ff-paper));color:var(--ff-forge-text)}.rq-badge--left{background:color-mix(in oklab, #2563eb 20%, var(--ff-paper));color:var(--ff-forge-text)}.rq-badge--none{background:color-mix(in oklab, var(--ff-forge-text) 14%, var(--ff-paper));color:var(--ff-forge-text)}@media (prefers-reduced-motion:reduce){.rq-option{transition:none}}.rqm-scene{background:var(--ff-warm);border:2px solid var(--ff-outline);border-radius:.8rem;margin:.4rem 0 .7rem;padding:.85rem .95rem}.rqm-vessel-tag{color:var(--ff-forge-text);margin-bottom:.35rem;font-weight:800}.rqm-react{color:var(--ff-forge-text);margin:.15rem 0;font-size:1.06rem;font-weight:700}.rqm-visible{color:var(--ff-forge-text);opacity:.82;margin:.15rem 0 0}.rqm-choices{gap:.55rem;margin-top:.3rem;display:grid}.rqm-choice{text-align:left;border:2px solid var(--ff-outline);background:var(--ff-paper);min-height:48px;color:var(--ff-forge-text);cursor:pointer;border-radius:.6rem;padding:.8rem .9rem;font-size:.98rem;font-weight:600;transition:border-color .14s,transform .14s}.rqm-choice:hover{border-color:var(--pc-select);transform:translateY(-1px)}.rqm-choice:focus-visible{outline:3px solid var(--pc-select);outline-offset:2px}.rqm-choice[disabled]{cursor:default;opacity:.92}.rqm-choice--correct{border-color:var(--pc-correct,#2e7d54);background:color-mix(in oklab, var(--pc-correct,#2e7d54) 20%, var(--ff-paper));font-weight:800}.rqm-choice--wrong{border-color:var(--pc-incorrect,#b3452f);background:color-mix(in oklab, var(--pc-incorrect,#b3452f) 16%, var(--ff-paper))}.rqm-reveal{border:2px solid var(--ff-outline);background:var(--ff-warm);text-align:center;border-radius:.7rem;margin-top:.7rem;padding:.6rem}.rqm-svg{width:100%;max-width:320px;height:auto}.rqm-vessel{fill:color-mix(in oklab, var(--pc-select) 12%, var(--ff-paper));stroke:var(--ff-outline);stroke-width:2.5px}.rqm-lid{fill:color-mix(in oklab, var(--pc-select) 40%, var(--ff-paper));stroke:var(--ff-outline);stroke-width:2px}.rqm-vlabel{fill:var(--ff-forge-text);letter-spacing:.04em;font-size:12px;font-weight:800}.rqm-atom{fill:color-mix(in oklab, var(--pc-select) 62%, var(--ff-paper));stroke:var(--ff-outline);stroke-width:1.5px}.rqm-arrow{stroke:var(--ff-forge-text);stroke-width:2.5px;fill:none}.rqm-arrowhead{fill:var(--ff-forge-text)}.rqm-arrowlbl{fill:var(--ff-forge-text);font-size:11px;font-weight:700}.rqm-tally{fill:var(--ff-forge-text);font-variant-numeric:tabular-nums;font-size:13px;font-weight:800}@media (prefers-reduced-motion:reduce){.rqm-choice,.rqm-choice:hover{transition:none;transform:none}}.pc-theme-reactquest.pc-immersive{--pc-env-bg:url(/play/reactquest/env.webp) center / cover no-repeat, linear-gradient(to bottom, #ccd6da 0%, #d4dadc 24%, #dddfd6 54%, #e6e4d8 78%, #ece9dc 100%);--pc-env-bg-dark:url(/play/reactquest/env-dark.webp) center / cover no-repeat, linear-gradient(to bottom, #0e1820 0%, #131e28 40%, #191f26 72%, #1d1e22 100%);--pc-env-bg-flat:url(/play/reactquest/env.webp) center / cover no-repeat, oklab(89.9091% -.00414694 .00471075);--pc-env-bg-flat-dark:url(/play/reactquest/env-dark.webp) center / cover no-repeat, #151e26}.rq-kits-details{margin:.4rem 0 1rem}.rq-kits-summary{cursor:pointer;color:var(--ff-anvil);flex-wrap:wrap;align-items:center;gap:.5rem;font-size:1.05rem;font-weight:800;list-style:none;display:flex}.rq-kits-summary::-webkit-details-marker{display:none}.rq-kits-summary:before{content:"▸";color:var(--pc-select);font-weight:800}.rq-kits-details[open] .rq-kits-summary:before{content:"▾"}.rq-tt-optrow{gap:.5rem;margin:.6rem 0;display:grid}.rq-tt-choice{width:100%;min-height:44px}.rq-tt-appar{justify-content:center;margin:.4rem 0 .2rem;display:flex}.rq-tt-appar svg{width:100%;max-width:180px;height:auto}.rq-tt-reveal{opacity:0;transition:opacity .4s,transform .4s;transform:translateY(6px)}.rq-tt-reveal.rq-tt-anim{opacity:1;transform:none}.rq-tt-curve{max-width:360px}.rq-tt-axis{stroke:var(--ff-outline);stroke-width:2px}.rq-tt-ref{stroke:var(--ff-forge-text);stroke-width:1px;stroke-dasharray:3 3;opacity:.55}.rq-tt-eqline{stroke:var(--pc-select);stroke-width:1.5px;stroke-dasharray:4 3;opacity:.8}.rq-tt-poly{stroke:var(--pc-select);stroke-width:3px;stroke-linejoin:round;stroke-linecap:round}.rq-tt-eqdot{fill:var(--pc-correct,#2e7d54);stroke:var(--ff-paper);stroke-width:1.5px}.rq-tt-tick,.rq-tt-axlbl{fill:var(--ff-forge-text);font-size:11px;font-weight:700}.rq-tt-eq{color:var(--ff-anvil);margin-top:.55rem;font-size:.95rem;line-height:1.5}.rq-tt-eq strong{color:var(--ff-forge-text);font-variant-numeric:tabular-nums}@media (prefers-reduced-motion:reduce){.rq-tt-reveal{opacity:1;transition:none;transform:none}}.rq-worked{background:var(--ff-warm);border:2px solid var(--ff-outline);color:var(--ff-anvil);border-radius:10px;margin:.7rem 0 0;padding:.6rem .8rem}.rq-worked-math{color:var(--ff-anvil);margin:.35rem 0 .2rem;overflow:auto hidden}.rq-worked-rule{color:var(--ff-anvil);opacity:.9;flex-wrap:wrap;align-items:baseline;gap:.4rem;margin-top:.4rem;font-size:.92rem;display:flex;overflow-x:auto}.rq-worked-rulelabel{text-transform:uppercase;letter-spacing:.04em;opacity:.8;color:var(--ff-forge-text);font-size:.68rem;font-weight:800}.pc-theme-reactquest .sf-led-curve-card{margin-bottom:1rem}.pc-theme-reactquest .sf-led-curve-title{margin:0 0 .6rem}.pc-theme-reactquest .sf-led-curve-row{grid-template-columns:7rem 1fr;align-items:center;gap:.5rem;margin-bottom:.5rem;display:grid}.pc-theme-reactquest .sf-led-curve-name{font-weight:700}.pc-theme-reactquest .sf-led-bar-wrap{background:var(--ff-panel,#7f7f7f29);border-radius:999px;height:1.1rem;position:relative;overflow:hidden}.pc-theme-reactquest .sf-led-bar-fill{background:var(--pc-correct,#1b7a3d);border-radius:999px;height:100%}.pc-theme-reactquest .sf-led-bar-stated{background:var(--pc-select,#2f7d8c);width:.2rem;position:absolute;top:-.12rem;bottom:-.12rem;transform:translate(-50%)}.pc-theme-reactquest .sf-led-curve-read{grid-column:2}.pc-theme-reactquest .sf-led-panel{border-left:.2rem solid var(--pc-select,#2f7d8c);background:var(--ff-panel,#7f7f7f14);border-radius:.4rem;margin-bottom:.75rem;padding:.6rem .9rem}.pc-theme-reactquest .sf-led-panel-key{opacity:.85;font-size:.85rem;font-weight:700}.pc-theme-reactquest .sf-led-choice-row{flex-wrap:wrap;gap:.6rem;margin-top:.75rem;display:flex}.pc-theme-reactquest .sf-led-choice{flex:10rem}.pc-theme-reactquest .sf-led-choice--on{outline:.2rem solid var(--pc-select,#2f7d8c);outline-offset:.12rem}.pc-theme-reactquest .sf-led-result{margin-top:1rem}.pc-theme-reactquest .sf-led-beans{margin-top:.5rem}.pc-theme-reactquest .sf-led-help{border-left:.2rem solid var(--pc-select,#2f7d8c);margin-top:.75rem}.pc-theme-reactquest .sf-led-nav{flex-wrap:wrap;gap:.5rem;margin-top:1rem;display:flex}