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.sk-switcher-btn{color:var(--color-ink);border-block-end:1px solid var(--sk-frame);border-inline-start:1px solid var(--sk-frame)}[data-skin=blueprint] .sk-switcher-btn[aria-expanded=true]{background:var(--sk-tint)}[data-skin=blueprint] .sk-switcher-pop{border:1.5px solid var(--sk-frame)}@media (width<=639.98px){[data-skin=blueprint] .sk-chapter-n{display:none}[data-skin=blueprint] .sk-chapter{text-align:center;justify-content:center;padding-inline:2px}}@media (width>=640px){[data-skin=blueprint] .sk-brand{border-block-end:0;border-inline-end:1px solid var(--sk-frame);min-width:190px}[data-skin=blueprint] .sk-chapter{padding:15px 14px;font-size:15px}[data-skin=blueprint] .sk-mine,[data-skin=blueprint] .sk-switcher-btn{border-block-end:0;padding-inline:18px}}[data-skin=blueprint] .card{background:#fff8e6db}@supports (color:color-mix(in lab, red, red)){[data-skin=blueprint] .card{background:color-mix(in srgb, var(--color-canvas) 86%, transparent)}}[data-skin=blueprint] .card{border-color:var(--color-hairline-strong)}[data-skin=blueprint] .sk-plain{background:0 0;border-color:#0000;padding:0}[data-skin=blueprint] .btn-primary,[data-skin=blueprint] .btn-outline{border:1.5px solid var(--color-ink);border-radius:0}[data-skin=blueprint] .btn-primary{border-color:var(--color-lintel)}[data-skin=blueprint] .btn-primary:hover{background:var(--sk-accent-ink);border-color:var(--sk-accent-ink)}[data-skin=blueprint] .btn-outline:hover{background:var(--sk-tint)}@media (width<=760px){[data-skin=blueprint] .sk-shell{padding:0}[data-skin=blueprint] .sk-sheet{outline:0;padding:12px 8px 8px}[data-skin=blueprint] .sk-ruler-top{background-size:100% 8px,100% 4px;height:8px;inset-inline:8px}[data-skin=blueprint] .sk-ruler-side{display:none}[data-skin=blueprint] .sk-frame:after{inset:3px}}[data-skin=textbook] .sk-frame{background:var(--color-canvas)}[data-skin=textbook] body{font-size:17px}[data-skin=textbook] .sk-nav{color:var(--color-ink);background:0 0;padding-block-end:4px}[data-skin=textbook] .sk-nav:after{content:"";border-block:1px solid var(--color-ink);border-block-end-width:.5px;width:min(1068px,100% - 32px);height:4px;margin:10px auto 0;display:block}[data-skin=textbook] .sk-nav-row{align-items:baseline;gap:4px 18px;max-width:1180px;padding:14px 16px 0}[data-skin=textbook] .sk-brand{font-family:var(--font-display);color:var(--color-steel);flex-direction:row;align-items:baseline;gap:8px;padding:0;font-size:17px}[data-skin=textbook] .sk-brand b{color:var(--color-ink);font-size:17px;font-weight:700}[data-skin=textbook] .sk-brand span{font-family:var(--font-display);font-size:14px}[data-skin=textbook] .sk-chapters{flex-wrap:wrap;gap:4px 16px;display:flex}[data-skin=textbook] .sk-chapter{color:var(--color-steel);border-block-end:1.5px solid #0000;align-items:baseline;gap:6px;padding:2px 0 3px;font-size:16px;font-weight:400}[data-skin=textbook] .sk-chapter-n{font-family:var(--font-display);color:var(--color-accent);font-size:16px;font-weight:700}[data-skin=textbook] .sk-chapter:hover{color:var(--color-ink)}[data-skin=textbook] .sk-chapter[aria-current]{color:var(--color-ink);border-block-end-color:var(--color-accent)}[data-skin=textbook] .sk-chapter-p{display:none}[data-skin=textbook] .sk-mine,[data-skin=textbook] .sk-switcher-btn{color:var(--color-accent);border-block-end:1px dotted var(--color-accent);padding:0;font-size:16px;font-weight:600}[data-skin=textbook] .sk-mine svg,[data-skin=textbook] .sk-switcher-btn svg{display:none}[data-skin=textbook] .sk-mine[aria-current]{border-block-end-style:solid}[data-skin=textbook] .sk-mine>span{display:inline}[data-skin=textbook] .sk-switcher-pop{inset-block-start:calc(100% + 10px)}@media (width>=640px){[data-skin=textbook] .sk-chapters{justify-content:center;gap:4px 26px}}@media (width>=1000px){[data-skin=textbook] .sk-nav-row{gap:32px;padding:22px 56px 0}}[data-skin=textbook] .card{border-color:var(--color-hairline);background:0 0}[data-skin=textbook] .sk-plain{border-color:#0000;padding:0}[data-skin=textbook] .btn-primary{border-radius:var(--radius-control);padding-inline:1.6rem;font-weight:600}[data-skin=textbook] .btn-outline{border:0;border-block-end:1px solid var(--color-hairline-strong);color:var(--color-steel);background:0 0;border-radius:0;padding-inline:0}[data-skin=textbook] .btn-outline:hover{color:var(--color-ink);border-block-end-color:var(--color-ink);background:0 0}[data-skin=instrument]{--color-warn:#ff9a5c}[data-skin=instrument] body{background:var(--sk-bench)}[data-skin=instrument] .sk-shell{background:radial-gradient(ellipse at 50% 0, var(--sk-bench), var(--sk-bench) 70%);padding:16px}@supports (color:color-mix(in lab, red, red)){[data-skin=instrument] .sk-shell{background:radial-gradient(ellipse at 50% 0, color-mix(in srgb, var(--sk-bench) 80%, #3a4046), var(--sk-bench) 70%)}}[data-skin=instrument] .sk-shell{background-color:var(--sk-bench)}[data-skin=instrument] .sk-sheet{background-color:var(--color-canvas);background-image:repeating-linear-gradient(90deg, #ffffff03 0 2px, transparent 2px 5px), linear-gradient(180deg, var(--sk-panel-hi), var(--color-canvas) 6%, var(--color-canvas) 94%, var(--sk-panel-lo));max-width:1360px;box-shadow:inset 0 1px 0 #ffffff14, inset 0 -2px 0 #0006, 0 0 0 1px var(--sk-frame), 0 30px 60px -20px #000000b3;border-radius:6px;margin-inline:auto;padding:14px 22px 18px}[data-skin=instrument] .sk-frame{background:0 0}[data-skin=instrument] .sk-screw{z-index:1;background:radial-gradient(circle at 35% 35%, var(--sk-screw-hi), var(--sk-screw-lo) 70%);border-radius:50%;width:12px;height:12px;display:block;position:absolute;box-shadow:0 1px #ffffff14,inset 0 0 0 1px #00000080}[data-skin=instrument] .sk-screw:after{content:"";background:var(--sk-panel-lo);position:absolute;inset:5px 2px;transform:rotate(35deg)}[data-skin=instrument] .sk-screw.s1{top:6px;inset-inline-start:6px}[data-skin=instrument] .sk-screw.s2{top:6px;inset-inline-end:6px}[data-skin=instrument] .sk-screw.s3{bottom:6px;inset-inline-start:6px}[data-skin=instrument] .sk-screw.s4{bottom:6px;inset-inline-end:6px}[data-skin=instrument] .sk-nav{color:var(--color-ink);border-block-end:1px solid var(--color-hairline);background:0 0;box-shadow:0 1px #ffffff0d}[data-skin=instrument] .sk-nav-row{align-items:center;gap:10px 12px;max-width:none;padding:4px 6px 12px}[data-skin=instrument] .sk-brand{padding:0}[data-skin=instrument] .sk-brand b{font-family:var(--font-display);color:var(--sk-plate);font-size:20px;font-weight:400}[data-skin=instrument] .sk-brand span{font-family:var(--font-num);color:var(--color-steel);margin-block-start:2px;font-size:12px}[data-skin=instrument] .sk-chapters{gap:6px}[data-skin=instrument] .sk-chapter,[data-skin=instrument] .sk-switcher-btn{border-radius:var(--radius-control);color:var(--color-ink);background-color:var(--sk-panel-hi);background-image:linear-gradient(180deg, var(--sk-panel-hi), var(--color-canvas));flex-direction:column;justify-content:center;gap:5px;padding:7px 4px;font-size:13.5px}@supports (color:color-mix(in lab, red, red)){[data-skin=instrument] .sk-chapter,[data-skin=instrument] .sk-switcher-btn{background-image:linear-gradient(180deg, color-mix(in srgb, var(--sk-panel-hi) 100%, #fff 4%), var(--color-canvas))}}[data-skin=instrument] .sk-chapter,[data-skin=instrument] .sk-switcher-btn{box-shadow:inset 0 1px 0 #ffffff1a, 0 2px 0 var(--sk-panel-lo), 0 3px 6px #00000059}[data-skin=instrument] .sk-chapter[aria-current],[data-skin=instrument] .sk-switcher-btn[aria-expanded=true]{color:var(--color-accent);background-image:linear-gradient(180deg, var(--color-canvas), var(--color-surface));box-shadow:inset 0 2px 4px #00000080,0 1px #ffffff0d}[data-skin=instrument] .led{background:var(--sk-led-off);border-radius:50%;flex:none;width:9px;height:9px;display:inline-block;box-shadow:inset 0 1px 1px #0009}[data-skin=instrument] .sk-chapter[aria-current] .led{background:var(--color-accent);box-shadow:0 0 8px 1px var(--sk-glow), inset 0 -1px 1px #0000004d}[data-skin=instrument] .sk-mine{color:var(--color-ink);gap:10px;padding:0}[data-skin=instrument] .sk-mine-l{text-align:end;font-size:13px;line-height:1.3}[data-skin=instrument] .sk-switcher-btn{flex-direction:row;padding:8px 12px}[data-skin=instrument] .sk-switcher-pop{background:var(--color-surface);border-color:var(--color-hairline);box-shadow:0 12px 30px #00000080}[data-skin=instrument] .sk-switcher-opt[aria-checked=true]{border-color:var(--color-accent);background:var(--color-canvas)}@media (width>=640px){[data-skin=instrument] .sk-nav-row{gap:18px;padding:2px 12px 14px}[data-skin=instrument] .sk-chapters{justify-content:center;gap:10px;display:flex}[data-skin=instrument] .sk-chapter{white-space:nowrap;flex-direction:row;gap:10px;width:auto;padding:9px 14px;font-size:15px}}@media (width>=640px) and (width<=1100px){[data-skin=instrument] .sk-chapter .max-sm\:hidden{display:none}[data-skin=instrument] .sk-chapter .sm\:hidden{display:inline}}[data-skin=instrument] .content-island h1,[data-skin=instrument] .content-island h2,[data-skin=instrument] .content-island h3{color:var(--color-ink)}[data-skin=instrument] .card{border-radius:var(--radius-card);background-color:var(--color-surface);background-image:linear-gradient(180deg, #fff, var(--color-surface));border:0}@supports (color:color-mix(in lab, red, red)){[data-skin=instrument] .card{background-image:linear-gradient(180deg, color-mix(in srgb, var(--color-surface) 100%, #fff 3%), var(--color-surface))}}[data-skin=instrument] .card{box-shadow:inset 0 1px 0 #ffffff0d, 0 0 0 1px var(--color-hairline)}[data-skin=instrument] .katex{color:var(--color-ink)}@media (width<=820px){[data-skin=instrument] .sk-shell{padding:0}[data-skin=instrument] .sk-sheet{border-radius:0;padding:10px 10px 12px}[data-skin=instrument] .sk-screw{display:none}}[data-skin=instrument] .content-island{--color-surface:var(--sk-island-bg);--color-canvas:var(--sk-island-bg);--color-ink:var(--sk-island-ink);--color-steel:var(--sk-island-steel);--color-ash:var(--sk-island-ash);--color-hairline:var(--sk-island-hairline);--color-hairline-strong:var(--sk-island-hairline-strong);--color-accent:var(--sk-island-ink);color:var(--color-ink)}[data-skin=instrument] .btn-primary,[data-skin=instrument] .btn-outline{color:var(--color-ink);background-color:var(--sk-panel-hi);background-image:linear-gradient(180deg, var(--sk-panel-hi), var(--color-canvas));border:0;border-radius:5px;gap:.8em}@supports (color:color-mix(in lab, red, red)){[data-skin=instrument] .btn-primary,[data-skin=instrument] .btn-outline{background-image:linear-gradient(180deg, color-mix(in srgb, var(--sk-panel-hi) 100%, #fff 3%), var(--color-canvas))}}[data-skin=instrument] .btn-primary,[data-skin=instrument] .btn-outline{box-shadow:inset 0 1px 0 #ffffff17, 0 2px 0 var(--sk-panel-lo), 0 4px 10px #00000059;transition:transform 90ms ease-out,box-shadow 90ms ease-out}[data-skin=instrument] .btn-outline:before,[data-skin=instrument] .btn-primary:after{content:"";background:radial-gradient(circle at var(--knob) 50%, #d4d8dc 0, #7b828a .42em, transparent .47em), var(--sk-panel-lo);border-radius:.625em;flex:none;width:2.4em;height:1.25em;box-shadow:inset 0 2px 4px #000c}[data-skin=instrument] .btn-outline:before{--knob:calc(100% - .62em)}[data-skin=instrument] .btn-primary:after{--knob:.62em;background:radial-gradient(circle at var(--knob) 50%, #fff6e6 0, #e3c48f .42em, transparent .47em), #5c3c09}[data-skin=instrument] .btn-primary{color:var(--color-on-lintel);background-color:var(--color-lintel);background-image:linear-gradient(180deg, #272727, var(--color-lintel));font-weight:600}@supports (color:color-mix(in lab, red, red)){[data-skin=instrument] .btn-primary{background-image:linear-gradient(180deg, color-mix(in srgb, var(--color-lintel) 100%, #fff 18%), var(--color-lintel))}}[data-skin=instrument] .btn-primary{box-shadow:inset 0 1px 0 #fff6, 0 2px 0 #8a5a12, 0 0 22px -4px var(--sk-glow)}[data-skin=instrument] .btn-primary:hover{opacity:1;filter:brightness(1.05)}[data-skin=instrument] .btn-outline:hover{background-color:var(--sk-panel-hi);filter:brightness(1.12)}[data-skin=instrument] .btn-primary:active,[data-skin=instrument] .btn-outline:active{transform:translateY(1px)}@media (prefers-reduced-motion:reduce){.sk-switcher-pop{animation:none}[data-skin=instrument] .btn-primary,[data-skin=instrument] .btn-outline{transition:none}[data-skin=instrument] .btn-primary:active,[data-skin=instrument] .btn-outline:active{transform:none}}[data-skin=blueprint] .sk-frame,[data-skin=instrument] .sk-frame{min-height:calc(100vh - 36px)}[data-skin=blueprint] main h1,[data-skin=blueprint] main h2{font-weight:600}[data-skin=textbook] main h1{font-size:clamp(2.1rem,4vw,2.9rem);font-weight:700;line-height:1.1}[data-skin=textbook] main h2,[data-skin=textbook] main h3{font-weight:700}[data-skin=instrument] .field{background:var(--sk-glass);color:var(--color-accent);border-color:var(--color-hairline)}[data-skin=instrument] .chip:has(input:checked){background:var(--color-accent);color:var(--color-on-lintel);border-color:var(--color-accent)}[data-skin=instrument] .robot-stage{border-color:var(--color-hairline);box-shadow:0 1px #ffffff0d}.skin-card svg{border:1px solid var(--color-hairline);border-radius:2px;width:100%;height:auto;max-height:120px}.skin-card[aria-current=true]{outline:2px solid var(--color-accent);outline-offset:-2px}.math{font-family:var(--font-num);overflow-wrap:anywhere;direction:ltr;unicode-bidi:isolate}.math-short{white-space:nowrap}.pr-tabs{border:1px solid var(--color-hairline-strong);border-radius:var(--radius-control);grid-template-columns:repeat(2,minmax(0,1fr));gap:0;display:grid;overflow:hidden}.pr-tab{text-align:center;min-height:44px;color:var(--color-steel);background:var(--color-surface);justify-content:center;align-items:center;padding:.4rem .5rem;font-size:15px;font-weight:500;line-height:1.3;display:flex}.pr-tab+.pr-tab{border-inline-start:1px solid var(--color-hairline)}.pr-tab:nth-child(3){border-inline-start:0}.pr-tab:nth-child(n+3){border-block-start:1px solid var(--color-hairline)}.pr-tab:hover{color:var(--color-ink)}.pr-tab[aria-current]{color:var(--color-on-lintel);background:var(--color-lintel)}@media (width>=640px){.pr-tabs{grid-template-columns:repeat(4,minmax(0,1fr))}.pr-tab:nth-child(3){border-inline-start:1px solid var(--color-hairline)}.pr-tab:nth-child(n+3){border-block-start:0}}.pr-lead{border-inline-start:2px solid var(--color-ink)}.pr-warn{font-family:var(--font-display);font-size:1.15rem;line-height:1.5}.pr-meta{flex-wrap:wrap;align-items:baseline;gap:.25rem .75rem;margin:0;font-size:14px;display:flex}.pr-meta .sk-num{text-align:center;border:1px solid var(--color-hairline-strong);border-radius:var(--radius-control);min-inline-size:1.75rem;padding:0 .4rem}.pr-island{flex-direction:column;gap:1rem;display:flex}.pr-text{max-inline-size:68ch;margin:0;font-size:17px;line-height:1.8}.pr-givens dl{grid-template-columns:minmax(0,1fr);gap:.25rem 1.5rem;margin:.25rem 0 0;display:grid}.pr-givens dl>div{border-block-end:1px solid var(--color-hairline);flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:0 .75rem;padding-block:.3rem;display:flex}.pr-givens dt{color:var(--color-steel);font-size:14px}.pr-givens dd{margin:0;font-size:15px}@media (width>=640px){.pr-givens dl{grid-template-columns:repeat(2,minmax(0,1fr))}}.pr-answer{align-items:stretch;gap:.5rem;max-inline-size:22rem;display:flex}.pr-unit{color:var(--color-steel);border:1px solid var(--color-hairline);border-radius:var(--radius-control);align-items:center;padding-inline:.75rem;font-size:15px;display:inline-flex}.pr-hint{border-inline-start:2px solid var(--color-accent);background:var(--sk-tint,transparent);padding:.6rem .8rem}.pr-option{border:1px solid var(--color-hairline-strong);border-radius:var(--radius-control);cursor:pointer;align-items:baseline;gap:.6rem;padding:.5rem .75rem;display:flex}.pr-option:has(input:checked){border-color:var(--color-ink)}.pr-feedback{animation:.2s cubic-bezier(.2,.8,.2,1) both rise-enter}.pr-verdict{margin:0;font-size:17px;font-weight:600}.pr-verdict:before{content:"";border:2px solid var(--color-ink);vertical-align:.05em;border-radius:50%;block-size:.6em;inline-size:.6em;margin-inline-end:.5em;display:inline-block}.pr-verdict.ok:before{background:var(--color-ink)}.pr-verdict span{font-size:15px;font-weight:400}.pr-steps{flex-direction:column;gap:.5rem;margin:0;padding-inline-start:1.4rem;font-size:15px;line-height:1.8;list-style:decimal;display:flex}.pr-steps li::marker{font-family:var(--font-num);color:var(--color-steel)}.pr-tags{flex-wrap:wrap;gap:.5rem;display:flex}.pr-tag{min-height:44px;color:var(--color-ink);border:1px solid var(--color-hairline-strong);border-radius:var(--radius-control);background:var(--color-surface);padding:.4rem 1rem;font-size:15px;font-weight:500}.pr-tag:hover{border-color:var(--color-ink)}.pr-tag[aria-pressed=true]{color:var(--color-on-lintel);background:var(--color-lintel);border-color:var(--color-lintel)}.pr-ratings{grid-template-columns:repeat(2,minmax(0,1fr));gap:.5rem;max-inline-size:34rem;display:grid}@media (width>=520px){.pr-ratings{grid-template-columns:repeat(4,minmax(0,1fr))}}.pr-rate{flex-direction:column;justify-content:center;gap:0;min-height:56px;padding:.4rem .5rem;line-height:1.3}.pr-rate-when{opacity:.85;font-size:12px;font-weight:400}.pr-details summary{cursor:pointer;inline-size:fit-content}.pr-details[open] summary{margin-block-end:.5rem}.pr-clip{-webkit-line-clamp:1;-webkit-box-orient:vertical;display:-webkit-box;overflow:hidden}.pr-progress{background:var(--color-hairline);flex:1;block-size:3px}.pr-progress span{background:var(--color-ink);block-size:100%;transition:inline-size .24s cubic-bezier(.2,.8,.2,1);display:block}.pips{direction:ltr;gap:3px;display:inline-flex}.pip{border:1px solid var(--color-hairline-strong);background:0 0;block-size:6px;inline-size:14px}.pip.on{background:var(--color-ink);border-color:var(--color-ink)}.pr-mastery{flex-direction:column;margin:0;padding:0;list-style:none;display:flex}.pr-mastery li{border-block-end:1px solid var(--color-hairline);align-items:center;gap:.75rem;padding-block:.6rem;display:flex}.pr-level{inline-size:3.5rem;color:var(--color-steel);font-size:14px}.pr-clock{z-index:20;align-items:center;gap:.75rem;padding:.6rem .9rem;display:flex;position:sticky;inset-block-start:8px}.pr-clock-of{font-size:14px}@media (width<=420px){.pr-clock-of{display:none}.pr-clock .btn-outline{padding-inline:.75rem}}.pr-clock-t{font-variant-numeric:tabular-nums;font-size:1.75rem;line-height:1.1}.pr-clock-t.low{text-underline-offset:6px;text-decoration:underline;text-decoration-thickness:2px}.pr-qnav{flex-wrap:wrap;gap:.4rem;display:flex}.pr-qnav button{block-size:44px;inline-size:44px;font-family:var(--font-num);color:var(--color-ink);border:1px solid var(--color-hairline-strong);border-radius:var(--radius-control);background:var(--color-surface);font-size:15px}.pr-qnav button[data-answered=true]{border-color:var(--color-ink);box-shadow:inset 0 -3px 0 var(--color-ink)}.pr-qnav button[aria-current]{color:var(--color-on-lintel);background:var(--color-lintel);border-color:var(--color-lintel)}.pr-bars{flex-direction:column;gap:.5rem;margin:0;display:flex}.pr-bars ul{flex-direction:column;gap:.5rem;margin:0;padding:0;list-style:none;display:flex}.pr-bars li{grid-template-columns:6.5rem minmax(0,1fr) 3.5rem;align-items:center;gap:.75rem;font-size:14px;display:grid}.pr-bar-track{block-size:14px;position:relative}.pr-bar{background:var(--color-ink);transform-origin:100%;border-start-end-radius:4px;border-end-end-radius:4px;block-size:100%;min-inline-size:2px;animation:.42s cubic-bezier(.2,.8,.2,1) both pr-grow;display:block}[dir=ltr] .pr-bar{transform-origin:0}.pr-bar-tick{background:var(--color-steel);inline-size:2px;margin-inline-start:-1px;position:absolute;inset-block:-3px}.pr-bar-value{font-family:var(--font-num);font-variant-numeric:tabular-nums;color:var(--color-steel);text-align:end;direction:ltr}@keyframes pr-grow{0%{transform:scaleX(0)}to{transform:scaleX(1)}}.pr-errlist{flex-direction:column;margin:0;padding:0;list-style:none;display:flex}.pr-errlist li{border-block-end:1px solid var(--color-hairline);align-items:center;gap:.75rem;padding-block:.6rem;font-size:15px;display:flex}.pr-cause{border:1px solid var(--color-hairline-strong);border-radius:var(--radius-control);flex:none;padding:.1rem .6rem;font-size:13px}[data-skin=blueprint] .pr-tabs{border:1.5px solid var(--sk-frame);border-radius:0}[data-skin=blueprint] .pr-tab{background:0 0}[data-skin=blueprint] .pr-tab:hover{background:var(--sk-tint)}[data-skin=blueprint] .pr-tab[aria-current]{background:var(--color-lintel)}[data-skin=blueprint] .pr-lead{border-inline-start:3px solid var(--color-lintel)}[data-skin=blueprint] .pr-meta .sk-num{border-color:var(--sk-frame)}[data-skin=textbook] .pr-tabs{border:0;border-block-end:1px solid var(--color-hairline-strong);border-radius:0;overflow:visible}[data-skin=textbook] .pr-tab{font-family:var(--font-display);background:0 0;font-size:16px;border:0!important;border-block-end:2px solid #0000!important}[data-skin=textbook] .pr-tab[aria-current]{color:var(--color-ink);background:0 0;border-block-end-color:var(--color-accent)!important}[data-skin=textbook] .pr-lead{border:0;border-inline-start:0;padding-inline:0}[data-skin=textbook] .pr-text{font-family:var(--font-display);font-size:19px}[data-skin=textbook] .pr-meta .sk-num{color:var(--color-accent);border:0;padding:0;font-size:18px;font-weight:700}[data-skin=textbook] .pr-steps li::marker{font-family:var(--font-display);color:var(--color-accent);font-weight:700}[data-skin=instrument] .pr-tabs{border:0;gap:6px;overflow:visible}[data-skin=instrument] .pr-tab{border-radius:var(--radius-control);color:var(--color-ink);background-image:linear-gradient(180deg, var(--sk-panel-hi), var(--color-canvas));border:0!important}@supports (color:color-mix(in lab, red, red)){[data-skin=instrument] .pr-tab{background-image:linear-gradient(180deg, color-mix(in srgb, var(--sk-panel-hi) 100%, #fff 4%), var(--color-canvas))}}[data-skin=instrument] .pr-tab{box-shadow:inset 0 1px 0 #ffffff1a, 0 2px 0 var(--sk-panel-lo), 0 3px 6px #00000059}[data-skin=instrument] .pr-tab[aria-current]{color:var(--color-accent);background-color:var(--color-canvas);background-image:linear-gradient(180deg, var(--color-canvas), var(--color-surface));box-shadow:inset 0 2px 4px #00000080}[data-skin=instrument] .pr-lead{border-inline-start:0}[data-skin=instrument] .pr-island{border-radius:var(--radius-image);background:var(--sk-island-bg);padding:1rem 1.1rem;box-shadow:inset 0 2px 6px #00000059}[data-skin=instrument] .pip{background:var(--sk-led-off);border:0;border-radius:50%;block-size:9px;inline-size:9px;box-shadow:inset 0 1px 1px #0009}[data-skin=instrument] .pip.on{background:var(--color-accent);box-shadow:0 0 6px 1px var(--sk-glow)}[data-skin=instrument] .pr-tag,[data-skin=instrument] .pr-qnav button{background:var(--sk-panel-hi);border-color:var(--color-hairline)}[data-skin=instrument] .pr-tag[aria-pressed=true],[data-skin=instrument] .pr-qnav button[aria-current]{color:var(--color-on-lintel);background:var(--color-accent)}[data-skin=instrument] .pr-qnav button[data-answered=true]{box-shadow:inset 0 -3px 0 var(--color-accent)}[data-skin=instrument] .pr-bar{background:var(--color-accent);box-shadow:0 0 8px -2px var(--sk-glow)}[data-skin=instrument] .pr-progress span{background:var(--color-accent)}[data-skin=instrument] .pr-verdict.ok:before{background:var(--color-accent);border-color:var(--color-accent);box-shadow:0 0 6px var(--sk-glow)}[data-skin=instrument] .pr-clock{background:var(--color-surface)}@media (prefers-reduced-motion:reduce){.pr-feedback,.pr-bar{animation:none}.pr-progress span{transition:none}}:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}html,body,#root{min-height:100%;margin:0}body{background:var(--color-canvas);color:var(--color-ink);font-family:var(--font-sans);-webkit-font-smoothing:antialiased;font-size:16px;line-height:1.7}.ltr-island{direction:ltr;unicode-bidi:isolate;display:inline-block}h1,h2,h3{font-family:var(--font-display);text-wrap:balance;font-weight:500}.card{background:var(--color-surface);border:1px solid var(--color-hairline);border-radius:var(--radius-card)}.btn-primary{border-radius:var(--radius-control);background:var(--color-lintel);color:var(--color-on-lintel);align-items:center;gap:.5rem;font-weight:500;transition:background-color .15s ease-out,opacity .15s ease-out;display:inline-flex}.btn-primary:hover{opacity:.86}.btn-primary:disabled{opacity:.45;cursor:not-allowed}.btn-primary:active,.btn-outline:active{transform:scale(.98)}.btn-outline{border:1px solid var(--color-ink);border-radius:var(--radius-control);color:var(--color-ink);align-items:center;gap:.5rem;font-weight:500;transition:background-color .15s ease-out;display:inline-flex}.btn-outline:hover{background:var(--color-canvas)}.btn-outline:disabled{opacity:.45;cursor:not-allowed}.link{color:var(--color-accent);text-underline-offset:3px;text-decoration:underline}.icon-btn{width:2rem;height:2rem;color:var(--color-steel);border-radius:var(--radius-control);place-items:center;display:inline-grid}.icon-btn:hover{color:var(--color-ink);background:var(--color-hairline)}.field{background:var(--color-surface);color:var(--color-ink);border:1px solid var(--color-hairline-strong);border-radius:var(--radius-control)}.field::placeholder{color:var(--color-ash)}.field:focus-visible{outline:2px solid var(--color-accent);outline-offset:1px}.chip{cursor:pointer;border:1px solid var(--color-hairline-strong);border-radius:var(--radius-control);align-items:center;gap:.25rem;padding:.25rem .75rem;font-size:.875rem;display:inline-flex}.chip:has(input:checked){background:var(--color-ink);color:var(--color-surface);border-color:var(--color-ink)}.chip:has(input:focus-visible){outline:2px solid var(--color-accent);outline-offset:2px}.robot-stage{border-bottom:1px solid var(--color-hairline-strong)}.robot-stage canvas{display:block}.lab-stage{border-radius:var(--radius-card)}.earned-line{animation:.32s cubic-bezier(.2,.8,.2,1) both rise-enter}:where(a,button):focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.ring-arc{transition:stroke-dashoffset .6s cubic-bezier(.2,.8,.2,1)}.rise-enter{animation:.24s cubic-bezier(.2,.8,.2,1) both rise-enter}@keyframes rise-enter{0%{opacity:0;transform:translateY(.75rem)}to{opacity:1;transform:translateY(0)}}@media (prefers-reduced-motion:reduce){.ring-arc{transition:none}.rise-enter,.earned-line{animation:none}.btn-primary:active,.btn-outline:active{transform:none}.btn-primary,.btn-outline{transition:none}}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-divide-y-reverse{syntax:"*";inherits:false;initial-value:0}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-leading{syntax:"*";inherits:false}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-ordinal{syntax:"*";inherits:false}@property --tw-slashed-zero{syntax:"*";inherits:false}@property --tw-numeric-figure{syntax:"*";inherits:false}@property --tw-numeric-spacing{syntax:"*";inherits:false}@property --tw-numeric-fraction{syntax:"*";inherits:false}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}