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mod(var(--house),3)*13px);border-radius:4px 4px 0 0}.town-house i{background:#ffe58c;opacity:calc(.15 + var(--town-light)*.85);width:9px;height:11px;border-radius:2px}.power-playback{display:flex;gap:10px;margin-top:20px}.power-playback button{font:inherit;font-size:11px;border:1px solid var(--line);border-radius:20px;padding:11px 17px;background:#fff;color:#23335b;cursor:pointer}.power-playback #power-play{background:var(--blue);border-color:var(--blue);color:#fff;min-width:95px}.power-model-note{font-size:10px;color:var(--muted);line-height:1.9;margin:14px 4px 0}.power-plants{margin:43px 0}.plant-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.plant-card{--plant:#bc804e;background:#fff;border:1px solid var(--line);border-radius:22px;padding:25px;min-width:0}.plant-wind{--plant:#4f9171}.plant-hydro{--plant:#5285c9}.plant-nuclear{--plant:#8a6aaf}.plant-title{display:flex;align-items:center;gap:12px}.plant-symbol{display:grid;place-items:center;width:48px;height:48px;border-radius:14px;background:color-mix(in srgb,var(--plant) 12%,white);font-size:29px;color:var(--plant)}.plant-number{display:block;font-size:9px;color:var(--plant);letter-spacing:1px;margin-bottom:4px}.plant-title h3{font-size:20px;margin:0}.plant-switch{margin-left:auto;font-size:11px;display:flex;gap:5px;align-items:center;color:var(--muted)}.plant-switch input{accent-color:var(--plant)}.plant-process{font-size:10px;line-height:1.9;color:var(--muted);margin:17px 0}.plant-output{display:flex;align-items:baseline;justify-content:space-between;gap:12px}.plant-output strong{font-size:39px;line-height:1.3;font-weight:600;color:var(--plant);font-variant-numeric:tabular-nums}.plant-output small{font-size:17px;font-weight:500}.plant-output>span{font-size:11px;color:var(--muted)}.plant-meter{height:9px;background:#edf0f6;border-radius:12px;overflow:hidden;margin:11px 0}.plant-meter i{display:block;height:100%;background:var(--plant);border-radius:12px}.plant-state{font-size:10px;color:var(--muted);min-height:1.8em;line-height:1.8;margin:6px 0 0}.plant-sliders{padding:0 0 24px}.plant-sliders .power-slider-label{margin-top:21px;font-size:11px}.plant-sliders output{font-size:13px;color:var(--plant)}.plant-sliders input{accent-color:var(--plant)}.plant-facts{display:grid;grid-template-columns:1fr 1fr;gap:18px;border-top:1px solid var(--line);padding-top:18px}.plant-facts p{font-size:11px;color:var(--muted);line-height:1.9;margin:0}.plant-facts strong{display:block;color:#23335b;font-size:11px;margin-bottom:6px}.plant-model{font-size:9px;line-height:1.9;color:var(--muted);background:#f5f7fa;padding:12px;border-radius:10px;margin:15px 0 0}.steam-lab{margin:45px 0;scroll-margin-top:20px}.steam-source{display:flex;flex-wrap:wrap;gap:8px}.steam-source button{font:inherit;font-size:12px;border:1px solid var(--line);border-radius:20px;padding:11px 18px;background:#fff;color:var(--muted);cursor:pointer}.steam-source button[aria-pressed=true]{background:#fff1d6;color:#9c6e2d;border-color:#d4b47e}.steam-source-note{font-size:11px;color:var(--muted);line-height:1.9;margin:14px 0 18px}.steam-canvas-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:22px;background:#f0f4ff}.steam-canvas-wrap canvas{display:block;width:100%;min-width:680px;aspect-ratio:840/450}.steam-scroll-note{font-size:9px;color:var(--muted);margin:9px 3px 16px}.steam-steps{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:8px}.steam-steps button{font:inherit;font-size:11px;font-weight:700;border:1px solid var(--line);border-radius:12px;padding:15px 10px;background:#fff;color:#23335b;cursor:pointer;line-height:1.8}.steam-steps button>span{display:block;font-size:9px;font-weight:600;color:var(--muted);margin-bottom:5px}.steam-steps button[aria-pressed=true]{border-color:#c1a36d;background:#fff4d8;color:#8d652a}.steam-explanation{padding:24px 28px;background:#fff4dc;border-radius:18px;margin-top:16px}.steam-explanation h3{font-size:19px;margin:0}.steam-explanation p{font-size:12px;line-height:2;color:#736851;margin:12px 0 0}.steam-model-note{font-size:9px;line-height:1.9;color:var(--muted);margin:13px 3px 0}.power-presets{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.power-presets button{font:inherit;border:1px solid var(--line);border-radius:17px;background:#fff;padding:22px 18px;text-align:left;cursor:pointer;color:#23335b;transition:transform .15s}.power-presets button:hover{transform:translateY(-3px)}.power-presets strong{display:block;font-size:13px;line-height:1.8;margin-bottom:12px}.power-presets span{font-size:10px;line-height:1.9;color:var(--muted)}.power-learning{background:#eaf0fb;border-radius:21px;padding:30px;margin:32px 0}.power-learning h2{font-size:21px}.power-learning p{font-size:12px;line-height:2;color:var(--muted);margin-bottom:0}.power-sources{margin:25px 0 45px;font-size:11px;color:var(--muted);line-height:2}.power-sources summary{cursor:pointer;font-weight:700}.power-sources a{display:block;text-decoration:underline;margin:8px 0}.power-dashboard button:focus-visible,.power-presets button:focus-visible,.steam-source button:focus-visible,.steam-steps button:focus-visible,.steam-canvas-wrap:focus-visible,main input:focus-visible{outline:3px solid var(--blue);outline-offset:3px}@media(max-width:950px){.power-dashboard{gap:15px}.power-total-panel,.power-demand-panel{padding:23px}.plant-grid{gap:15px}.plant-card{padding:22px}.power-presets{grid-template-columns:repeat(2,minmax(0,1fr))}.steam-steps button{font-size:10px}.plant-facts{grid-template-columns:1fr;gap:13px}}@media(max-width:700px){.power-back{font-size:9px}.power-intro{margin-top:18px}.power-intro h1{font-size:clamp(31px,7.5vw,42px)}.power-dashboard{grid-template-columns:1fr}.power-total>strong{font-size:51px}.power-balance{font-size:11px}.power-energy{flex-wrap:wrap;gap:7px}.power-total-panel,.power-demand-panel{padding:23px}.power-town{height:100px;gap:8px}.town-house{width:40px;padding:12px 7px;gap:8px}.power-plants{margin-top:32px}.power-plants h2,.steam-lab .section-heading h2,.power-experiments h2{font-size:22px}.plant-grid{grid-template-columns:1fr}.plant-title h3{font-size:20px}.plant-facts{grid-template-columns:1fr 1fr;gap:14px}.plant-facts p{font-size:10px}.steam-lab{margin:33px 0}.steam-steps{grid-template-columns:repeat(3,minmax(0,1fr))}.steam-steps button{padding:12px 7px;font-size:10px}.steam-explanation{padding:23px}.steam-explanation h3{font-size:17px}.steam-explanation p{font-size:11px}.power-presets{gap:10px}.power-presets button{padding:18px 13px}.power-presets strong{font-size:12px}.power-learning{padding:24px}.power-learning h2{font-size:19px}.power-learning p{font-size:11px}.power-model-note{font-size:9px}}.power-steam-jump{display:inline-block;margin-top:21px;padding:12px 19px;font-size:12px;font-weight:700;background:#fff1d3;color:#986929;border-radius:23px;border:1px solid #ead7b3}.plant-animation-link{display:inline-block;font-size:10px;color:var(--plant);text-decoration:underline;text-underline-offset:3px;margin:0 0 16px}.steam-source button{min-width:100px}.steam-steps button{font-size:10px;overflow-wrap:anywhere}@media(max-width:700px){.steam-source{display:grid;grid-template-columns:1fr 1fr}.steam-source button{min-width:0;padding:11px;font-size:11px}.steam-steps{grid-template-columns:repeat(2,minmax(0,1fr))}}.plant-grid{grid-template-columns:1fr}.plant-workbench{display:grid;grid-template-columns:minmax(0,2fr) minmax(230px,1fr);gap:26px;margin:18px 0}.plant-visual,.plant-controls{min-width:0}.plant-visual .steam-canvas-wrap{border-radius:15px}.plant-visual canvas{min-width:580px}.plant-controls .plant-sliders{padding-bottom:0}.plant-lesson{margin:0 0 22px}.plant-lesson summary{font-size:12px;font-weight:700;color:var(--plant);cursor:pointer;padding:12px 0}.plant-lesson .steam-explanation h4{font-size:17px;margin:0}.plant-lesson .steam-steps{margin-top:8px}.plant-lesson .steam-steps button[aria-pressed=true]{border-color:var(--plant);color:var(--plant);background:color-mix(in srgb,var(--plant) 9%,white)}.power-plants{scroll-margin-top:20px}@media(max-width:800px){.plant-workbench{grid-template-columns:1fr;gap:10px}.plant-controls .plant-sliders{padding-bottom:8px}.plant-controls .steam-source-note{margin-bottom:4px}}.plant-animation-toggle{font:inherit;font-size:11px;color:var(--plant);background:#fff;border:1px solid var(--line);border-radius:18px;padding:9px 14px;margin:0 0 12px;cursor:pointer}.plant-animation-toggle:focus-visible{outline:3px solid var(--blue);outline-offset:3px}