:root{--font-family:"Flexo", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;--color-page:#f4f1ec;--color-surface:#fffdf8;--color-ink:#111;--color-muted:#5f5a55;--color-line:#bbb5ad;--color-board:#d2cfcb;--color-demand:#f47a24;--color-baseload:#28559c;--color-mid-merit:#c56a2d;--color-wind:#8ec4e8;--color-solar:#f2b705;--color-flex:#5d9d3a;--color-batteries:#7a4ea3;--color-alert:#c93b2b;--color-success:#247a56;--hours:24;--capacity:7;--roundness:4px;--shadow-hard:0 12px 0 #1111111f;--ease:cubic-bezier(.4, 0, .2, 1)}*{box-sizing:border-box}body{background:var(--color-page);min-height:100vh;color:var(--color-ink);font-family:var(--font-family);margin:0}button{font:inherit}button:focus-visible,.cell:focus-visible{box-shadow:0 0 0 3px var(--color-ink);outline:0}.app-shell{flex-direction:column;min-height:100vh;padding:clamp(12px,3vw,32px);display:flex}.workspace{flex:1;max-width:1376px;margin:0 auto}.site-footer{border-top:2px solid var(--color-line);width:100%;max-width:1376px;color:var(--color-muted);margin:18px auto 0;padding-top:10px;font-size:.84rem;line-height:1.35}.site-footer p{margin:0}.site-footer p:first-child{font-weight:800}.site-footer p:last-child{font-weight:400}.intro{max-width:840px;margin-bottom:14px}.eyebrow,.small-label{color:var(--color-muted);letter-spacing:0;text-transform:uppercase;margin:0 0 8px;font-size:.78rem;font-weight:800}h1,h2,p{margin-top:0}h1{letter-spacing:0;max-width:780px;margin-bottom:12px;font-size:clamp(2rem,6vw,4.4rem);line-height:.98}#game-title{white-space:nowrap}h2{margin-bottom:0;font-size:1.15rem;line-height:1.2}.intro p:last-child{max-width:680px;color:var(--color-muted);margin-bottom:0;font-size:1.05rem;line-height:1.45}.game-layout{grid-template-columns:minmax(0,1fr) minmax(260px,340px);align-items:start;gap:18px;display:grid}.experience-shell{flex-direction:column;display:flex}.mode-tabs{border-top:2px solid var(--color-line);background:#e7dccd;flex-wrap:wrap;order:2;margin-top:10px;display:flex}.mode-tab{border:0;border-right:2px solid var(--color-line);min-height:58px;color:var(--color-muted);text-align:left;cursor:pointer;background:0 0;gap:2px;padding:10px 14px;font-size:.84rem;font-weight:800;line-height:1.2;display:grid}.mode-tab-single{align-content:center}.mode-tab:last-child{border-right:0}.mode-tab[data-active=true]{background:var(--color-surface);color:var(--color-ink)}.mode-tab-title{text-transform:uppercase;letter-spacing:.02em;font-size:.78rem}.mode-tab-description{font-size:.9rem;font-weight:900}.mode-panel{order:1;padding:0}.stage-interface{border:2px dashed var(--color-line);background:#f1e6d659;min-height:520px;padding:clamp(20px,4vw,34px)}.stage-interface h2{margin-bottom:10px}.stage-interface p:last-child{max-width:640px;color:var(--color-muted);margin:0;font-size:1rem;line-height:1.45}.board-area,.control-panel,.teaching-strip{border:2px solid var(--color-ink);background:var(--color-surface);box-shadow:var(--shadow-hard)}.board-area{z-index:1;padding:clamp(10px,1.8vw,18px);position:relative}.board-topline{justify-content:space-between;align-items:end;gap:16px;margin-bottom:12px;display:flex}.board-notice{border:2px solid var(--color-line);min-height:38px;color:var(--color-ink);background:#fffdf8b8;margin:0 0 10px;padding:8px 10px;font-size:.9rem;font-weight:800;line-height:1.2}.score{border-left:2px solid var(--color-line);text-align:right;min-width:132px;padding-left:16px}.score span{font-size:1.6rem;font-weight:900}.score small{color:var(--color-muted);font-weight:700;display:block}.board-wrap{background:var(--color-board);border:10px solid #706d6a;padding:12px 14px 20px 24px;position:relative;overflow:hidden}.board-battery-charge{z-index:5;border:2px solid var(--color-ink);color:var(--color-ink);pointer-events:none;background:#fffdf8eb;align-items:center;gap:8px;padding:6px 8px;animation:.42s cubic-bezier(.18,.86,.22,1) both battery-badge-pop;display:inline-flex;position:absolute;top:14px;right:16px;box-shadow:4px 4px #1111113d}.board-battery-charge strong,.board-battery-charge small{line-height:1;display:block}.board-battery-charge strong{font-size:1.2rem;font-weight:900}.board-battery-charge small{color:var(--color-muted);text-transform:uppercase;margin-top:2px;font-size:.68rem;font-weight:900}.board{z-index:2;grid-template-columns:repeat(var(--hours), minmax(30px, 1fr));grid-template-rows:repeat(var(--capacity), minmax(30px, 1fr));aspect-ratio:var(--hours) / var(--capacity);min-height:236px;display:grid;position:relative}.cell{cursor:pointer;transition:background .16s var(--ease), transform .16s var(--ease);background:#fffdf814;border-top:1px solid #fffdf8a3;border-right:1px solid #fffdf8a3;position:relative}.cell[data-outside-demand=true]{background:#1113}.cell:nth-child(-n+24){border-top:0}.cell[data-filled=true]:after,.palette-icon span:after{content:"";background:linear-gradient(#fff3,#0000001f);position:absolute;inset:9px}.cell[data-filled=true]{background:#11111161}.cell[data-tech=baseload]{background:var(--color-baseload)}.cell[data-tech=mid-merit]{background:var(--color-mid-merit)}.cell[data-tech=wind]{background:var(--color-wind)}.cell[data-tech=solar]{background:var(--color-solar)}.cell[data-tech=flex]{background:var(--color-flex)}.cell[data-tech=batteries]{background:var(--color-batteries)}.cell[data-falling=true]{animation:.46s cubic-bezier(.18,.86,.22,1) both block-drop;animation-delay:var(--fall-delay,0s)}.cell[data-falling=true]:after{animation:.46s cubic-bezier(.18,.86,.22,1) both block-settle;animation-delay:var(--fall-delay,0s)}.cell[data-charging-battery=true]:before{content:"";z-index:2;border:2px solid var(--color-ink);background:linear-gradient(var(--color-batteries), var(--color-batteries)) left 1px top 1px / 70% 3px no-repeat, #fffdf8eb;width:12px;height:7px;animation:battery-charge-pulse 1.2s var(--ease) infinite;border-radius:2px;position:absolute;top:4px;right:4px;box-shadow:0 0 0 1px #fffdf8b3}.cell[data-charging-battery=true]:after{inset:8px}.cell[data-charging-battery=true]{box-shadow:inset 0 0 0 2px #7a4ea39e}@keyframes block-drop{0%{transform:translateY(-42px)}74%{transform:translateY(2px)}to{transform:translateY(0)}}@keyframes block-settle{0%{opacity:0}28%{opacity:1}to{opacity:1}}@keyframes battery-charge-pulse{0%,to{opacity:.72;transform:translateY(0)}50%{opacity:1;transform:translateY(-1px)}}@keyframes battery-badge-pop{0%{opacity:0;transform:translateY(-6px)scale(.92)}to{opacity:1;transform:translateY(0)scale(1)}}.cell[data-preview=true]{background:#1111113d}.cell[data-preview=true][data-shift-transfer=true]{background:#f2df5ab3}.cell[data-invalid=true],.cell[data-preview=true][data-shift-transfer=true][data-invalid=true]{background:#c93b2b57}.cell[data-load-not-served=true]{background:repeating-linear-gradient(135deg,#11111152 0 4px,#fffdf838 4px 8px),#1111113d}.cell[data-gap=true]{background:#fffdf85c}.cell[data-gap=true][data-preview=true]{background:#11111147}.cell[data-gap=true][data-invalid=true]{background:#c93b2b66}.demand-overlay{z-index:4;pointer-events:none;position:absolute;overflow:visible}.demand-path{fill:none;stroke:var(--color-demand);stroke-width:7px;stroke-linejoin:miter;stroke-linecap:square}.axis-label{z-index:5;color:var(--color-muted);text-transform:uppercase;font-size:.75rem;font-weight:800;position:absolute}.y-label{writing-mode:vertical-rl;top:16px;left:8px;transform:rotate(180deg)}.x-label{bottom:6px;right:18px}.hour-axis{grid-template-columns:repeat(var(--hours), minmax(30px, 1fr));color:var(--color-muted);text-align:center;gap:0;margin:8px 32px 0 46px;padding:0;font-size:.75rem;font-weight:800;list-style:none;display:grid}.palette-section{margin-top:14px;padding-top:14px}.palette-page-toggle{grid-template-columns:1fr 1fr;gap:8px;margin-bottom:10px;display:grid}.palette-page-toggle-button{border:2px solid var(--color-line);border-radius:var(--roundness);min-height:36px;color:var(--color-ink);letter-spacing:.03em;text-transform:uppercase;cursor:pointer;background:0 0;font-size:.76rem;font-weight:900}.palette-page-toggle-button[data-active=true]{border-color:var(--color-ink);background:#f1e6d6}.control-panel{z-index:20;padding:14px;position:relative}.panel-section+.panel-section{border-top:2px solid var(--color-line);margin-top:14px;padding-top:14px}.block-palette,.dr-palette{gap:8px;display:grid}.board-area .dr-palette{grid-template-columns:repeat(3,minmax(0,1fr))}.dr-button{border:2px solid var(--color-line);border-radius:var(--roundness);width:100%;min-height:54px;color:var(--color-ink);text-align:left;cursor:pointer;background:0 0;grid-template-columns:44px minmax(0,1fr);align-items:start;gap:0 10px;padding:8px;display:grid}.dr-button[data-active=true]{border-color:var(--color-ink);background:#f1e6d6}.dr-button-copy{flex-wrap:wrap;align-items:baseline;gap:0 4px;display:flex}.dr-title{font-size:.86rem;font-weight:700}.dr-description{color:var(--color-muted);font-size:.76rem;font-weight:400;line-height:1.2}.dr-icon{fill:currentColor;stroke:currentColor;stroke-width:1.4px;align-self:center;width:40px;height:40px;margin-top:0}.dr-button small{color:var(--color-muted);font-size:.76rem;font-weight:400;line-height:1.2}.dr-button .dr-shift-status{color:var(--color-alert);flex-basis:100%}.board-area .block-palette{grid-template-columns:repeat(3,minmax(0,1fr))}.board-area .block-button{grid-column:auto}.block-button{border:2px solid var(--color-line);border-radius:var(--roundness);width:100%;min-height:54px;color:var(--color-ink);text-align:left;cursor:pointer;background:0 0;grid-template-columns:50px minmax(0,1fr);align-items:center;gap:10px;padding:6px;display:grid}.block-button:disabled{opacity:.56;cursor:not-allowed}.block-button[aria-pressed=true]{border-color:var(--color-ink);background:#f1e6d6}.block-button-copy{align-content:start;gap:2px;display:grid}.block-button-name{min-height:1.3em;font-size:.98rem;font-weight:700;display:block}.block-button small{color:var(--color-muted);line-height:1.25;display:block}.block-button .cost-hint{color:var(--color-ink);margin-top:4px;font-size:.72rem;font-weight:800}.block-button .disabled-hint{color:var(--color-alert);font-size:.72rem;font-weight:900;display:inline}.block-button .window-hint{color:var(--color-alert);font-weight:900}.palette-icon{grid-template-rows:repeat(3,1fr);grid-template-columns:repeat(4,1fr);gap:2px;height:34px;display:grid}.palette-icon span{background:var(--block-color);position:relative}.restriction-list{gap:10px;margin:0;padding:0;list-style:none;display:grid}.restriction-list li{border:2px solid var(--color-line);border-radius:var(--roundness);grid-template-columns:28px minmax(0,1fr);align-items:center;gap:10px;padding:8px;display:grid}.restriction-list li[data-active=true]{border-color:var(--color-ink);background:#f1e6d6}.restriction-swatch{border:2px solid var(--color-ink);background:repeating-linear-gradient(135deg, #1111112e 0 4px, transparent 4px 8px), linear-gradient(#ffffff94, #ffffff94), linear-gradient(var(--block-color), var(--block-color));width:28px;height:28px}.restriction-list strong,.restriction-list small{display:block}.restriction-list strong{font-size:.92rem}.restriction-list small{color:var(--color-muted);font-size:.78rem;font-weight:800}.status-list{gap:10px;display:grid}.status-item{color:var(--color-muted);justify-content:space-between;gap:12px;font-weight:700;display:flex}.status-item strong{color:var(--color-ink)}.battery-charge-value{color:var(--color-batteries);align-items:center;gap:6px;font-size:1rem;display:inline-flex}.battery-charge-icon{border:2px solid var(--color-ink);background:linear-gradient(var(--color-batteries), var(--color-batteries)) left 2px top 2px / 72% 4px no-repeat, #fffdf8eb;width:18px;height:10px;animation:battery-charge-pulse 1.2s var(--ease) infinite;border-radius:3px;position:relative;box-shadow:0 0 0 2px #7a4ea324}.battery-charge-icon:after{content:"";background:var(--color-ink);border-radius:0 2px 2px 0;width:3px;height:4px;position:absolute;top:2px;right:-5px}.cost-summary{gap:8px;display:grid}.cost-summary div{min-width:0;color:var(--color-muted);flex-wrap:nowrap;justify-content:space-between;align-items:center;gap:8px;font-weight:700;display:flex}.cost-summary span{white-space:nowrap;flex:none;min-width:0}.cost-summary strong{color:var(--color-ink);white-space:nowrap;text-align:right;text-overflow:ellipsis;flex:auto;min-width:0;font-size:.74rem;overflow:hidden}.cost-summary .total-cost{color:var(--color-ink);flex-direction:column;align-items:flex-start;gap:4px;margin-top:4px;padding-top:10px;display:flex}.total-cost strong{font-size:1.1rem;font-weight:900}.blended-rate-label{align-items:center;gap:6px;font-size:.82rem;font-weight:800;display:inline-flex}.panel-section-compact-metric .total-cost{margin-top:0;padding-top:0}.info-tooltip{border:2px solid var(--color-ink);background:var(--color-surface);width:18px;height:18px;color:var(--color-ink);cursor:help;z-index:200;border-radius:50%;justify-content:center;align-items:center;font-size:.72rem;font-weight:900;line-height:1;display:inline-flex;position:relative}.info-tooltip:focus{outline:2px solid var(--color-ink);outline-offset:2px}.cost-summary .tooltip-text{box-sizing:border-box;border:2px solid var(--color-ink);background:var(--color-surface);width:min(420px,100vw - 32px);box-shadow:var(--shadow-hard);color:var(--color-ink);white-space:normal;overflow-wrap:anywhere;word-break:break-word;opacity:0;visibility:hidden;pointer-events:none;z-index:300;padding:8px 10px;font-size:.78rem;font-weight:700;line-height:1.35;transition:opacity .12s,transform .12s,visibility .12s;display:block;position:absolute;top:calc(100% + 8px);right:0;transform:translateY(-3px)}.info-tooltip:hover .tooltip-text,.info-tooltip:focus .tooltip-text{opacity:1;visibility:visible;transform:translateY(0)}.total-cost .blended-rate-value{white-space:normal;text-overflow:clip;line-height:1.2;overflow:visible}.cost-status{color:var(--color-muted);margin:10px 0 0;font-size:.82rem;font-weight:700;line-height:1.35}.stack-section{min-width:0}.price-toggle{grid-template-columns:repeat(3,minmax(0,1fr));gap:6px;display:grid}.price-toggle-button{border:2px solid var(--color-line);border-radius:var(--roundness);min-height:36px;color:var(--color-ink);letter-spacing:.04em;text-transform:uppercase;cursor:pointer;background:0 0;font-size:.78rem;font-weight:900}.price-toggle-button[data-active=true]{border-color:var(--color-ink);background:#f1e6d6}.stack-wrap{background:var(--color-board);border:2px solid #706d6a;padding:8px;position:relative}.control-panel .stack-wrap{max-width:296px}.solved-board-view{margin-bottom:8px;position:relative}.board-stack-reveal{margin-bottom:0}.game-over-box{z-index:6;border:2px solid var(--color-ink);background:#f1e6d6f0;justify-items:start;gap:6px;width:min(250px,100% - 36px);padding:12px;display:grid;position:absolute;top:35px;left:35px;box-shadow:0 10px 22px #1111112e,inset 0 0 0 1px #1111111a}.game-over-box h3{letter-spacing:.02em;margin:0;font-size:1.2rem}.game-over-box .small-label{margin:0}.game-over-box strong{font-size:1.1rem}.game-over-box .button{min-width:140px;min-height:38px}@media (width<=680px){.game-over-box{width:min(250px,100% - 20px);padding:10px;top:10px;left:10px}}.stack-board{z-index:2;grid-template-columns:repeat(var(--hours), 1fr);grid-template-rows:repeat(var(--stack-capacity,var(--capacity)), 1fr);aspect-ratio:var(--hours) / var(--stack-capacity,var(--capacity));display:grid;position:relative}.stack-cell{background:#fffdf814;border-top:1px solid #fffdf88f;border-right:1px solid #fffdf88f;position:relative}.stack-cell:nth-child(-n+24){border-top:0}.stack-cell[data-demand=true]{background:#fffdf857}.stack-cell[data-filled=true]:after{content:"";background:linear-gradient(#fff3,#0000001f);position:absolute;inset:3px}.stack-cell[data-filled=true]:not([data-demand=true]):before{content:"";background:#11111152;position:absolute;inset:0}.stack-cell[data-tech=baseload]{background:var(--color-baseload)}.stack-cell[data-tech=mid-merit]{background:var(--color-mid-merit)}.stack-cell[data-tech=wind]{background:var(--color-wind)}.stack-cell[data-tech=solar]{background:var(--color-solar)}.stack-cell[data-tech=flex]{background:var(--color-flex)}.stack-cell[data-tech=batteries]{background:var(--color-batteries)}.stack-overlay{z-index:4;pointer-events:none;position:absolute;overflow:visible}.stack-demand-path{fill:none;stroke:var(--color-demand);stroke-width:4px;stroke-linejoin:miter;stroke-linecap:square}.actions{grid-template-columns:1fr 1fr;gap:10px;display:grid}.button{border:2px solid var(--color-ink);border-radius:var(--roundness);background:var(--color-ink);min-height:44px;color:var(--color-surface);cursor:pointer;font-weight:900}.button.secondary{color:var(--color-ink);background:0 0}.button:disabled{cursor:not-allowed;opacity:.45}.teaching-strip{border-color:var(--color-demand);margin-top:16px;padding:14px 16px}.teaching-strip p{max-width:980px;margin:0;font-size:1.08rem;line-height:1.45}@media (width<=980px){.game-layout{grid-template-columns:1fr}.control-panel{grid-template-columns:1fr 1fr;gap:20px;display:grid}.panel-section+.panel-section{border-top:0;margin-top:0;padding-top:0}.actions{grid-column:1/-1}}@media (width<=680px){.app-shell{padding:12px}h1{font-size:2.2rem}#game-title{font-size:clamp(1.3rem,8vw,2.2rem)}.board-topline,.control-panel{grid-template-columns:1fr}.board-topline{display:grid}.score{border-left:0;border-top:2px solid var(--color-line);text-align:left;padding:12px 0 0}.board-wrap{border-width:8px;padding:12px 12px 22px 24px;overflow-x:auto}.board{width:calc(var(--hours) * 42px);min-height:336px}.hour-axis{width:calc(var(--hours) * 42px);margin-left:32px}.board-area .block-palette,.board-area .dr-palette{grid-template-columns:repeat(3,minmax(0,1fr))}}