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button:focus-visible{outline:3px solid var(--gold);outline-offset:3px}.eq-game header{border-bottom-color:var(--border)}.eq-game .hud header{border-bottom:1px solid var(--border);font:600 15px var(--display);letter-spacing:.5px;background:0 0;flex-wrap:wrap;padding:8px 0 14px}.eq-game .hud .top-controls{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.eq-game .segmented{border:1px solid var(--border);background:color-mix(in srgb,var(--paper)85%,var(--panel));border-radius:11px;padding:3px;display:flex}.eq-game .segmented button{min-height:40px;box-shadow:none;background:0 0;border:0;padding:8px 12px;font-size:14px}.eq-game .segmented button[aria-pressed=true]{background:color-mix(in srgb,var(--panel)70%,var(--border-2));color:var(--green);box-shadow:none}.eq-game .utility{background:0 0;min-height:40px;padding:8px 12px;font-size:14px}.eq-game .streak{border-color:var(--border);color:var(--muted)}.eq-game .layout{grid-template-columns:minmax(0,1fr) 310px;align-items:start;gap:22px;display:grid}.eq-game .surface{min-width:0;position:relative}.eq-game .story-card,.eq-game .work-card,.eq-game .side>aside,.eq-game .trackcard{border:1px solid var(--border);background:var(--panel-2);border-radius:18px}.eq-game .story-card{border-top:3px solid color-mix(in srgb,var(--purple)70%,var(--border));margin-bottom:17px;padding:25px 28px}.eq-game .card-top{justify-content:space-between;align-items:center;gap:15px;margin-bottom:17px;display:flex}.eq-game .card-top .eyebrow{color:var(--purple);letter-spacing:2.2px;margin:0}.eq-game .pill{border:1px solid var(--border-2);background:color-mix(in srgb,var(--panel)80%,var(--border));color:color-mix(in srgb,var(--ink)85%,var(--muted));border-radius:20px;padding:6px 11px;font-size:12px}.eq-game .story-parts{flex-wrap:wrap;gap:8px;display:flex}.eq-game .story-part{text-align:left;min-height:0;box-shadow:none;background:0 0;border:1px solid #0000;border-radius:8px;padding:4px 8px;font-size:clamp(18px,1.65vw,22px);font-weight:400;line-height:1.65;transition:background .16s,border-color .16s;display:inline}.eq-game .story-part:hover:not(:disabled){border-color:color-mix(in srgb,var(--purple)35%,transparent);background:color-mix(in srgb,var(--panel)85%,var(--purple))}.eq-game .story-part.visited{border-color:color-mix(in srgb,var(--border)70%,var(--purple))}.eq-game .story-part.highlight,.eq-game .story-part[aria-pressed=true]{background:var(--panel-2);background:color-mix(in srgb,var(--panel)65%,var(--purple));border-color:var(--purple);color:color-mix(in srgb,var(--ink)92%,var(--purple));box-shadow:none}.eq-game .story-part.step1.highlight,.eq-game .story-part.step1[aria-pressed=true]{border-color:var(--green);background:var(--panel-2);background:color-mix(in srgb,var(--panel)72%,var(--green));color:color-mix(in srgb,var(--ink)90%,var(--green))}.eq-game .question{font:600 21px/1.5 var(--display);color:var(--ink);margin:17px 0 0}.eq-game .story-hint{color:var(--muted);margin:11px 0 0;font-size:13px}.eq-game .unknown-pill{border:1px solid color-mix(in srgb,var(--border)60%,var(--green));background:color-mix(in srgb,var(--panel)85%,var(--green));color:color-mix(in srgb,var(--ink)80%,var(--green));border-radius:9px;margin-top:16px;padding:10px 13px;font-size:15px}.eq-game .unknown-pill strong{font:700 20px var(--display);margin-right:6px}.eq-game .work-card{padding:24px 26px}.eq-game .step-label{color:var(--muted);letter-spacing:1.2px;align-items:center;gap:9px;margin-bottom:12px;font-size:12px;font-weight:700;display:flex}.eq-game .step-label b{background:color-mix(in srgb,var(--panel)60%,var(--border-2));color:color-mix(in srgb,var(--ink)80%,var(--purple));border-radius:5px;padding:4px 7px}.eq-game .prompt{color:color-mix(in srgb,var(--ink)70%,var(--muted));margin:0 0 16px;font-size:16px}.eq-game .muted{color:var(--muted)}.eq-game .actions{flex-wrap:wrap;align-items:center;gap:10px;margin-top:18px;display:flex}.eq-game .primary{background:var(--green);width:auto;color:color-mix(in srgb,var(--paper)80%,var(--green));border:1px solid var(--green);min-height:51px;box-shadow:none;justify-content:center;padding:13px 20px;font-weight:700;display:inline-flex}.eq-game .primary:hover:not(:disabled){background:color-mix(in srgb,var(--green)80%,var(--ink));border-color:color-mix(in srgb,var(--green)80%,var(--ink));box-shadow:none}.eq-game .primary:disabled:hover{background:var(--green);border-color:var(--green);box-shadow:none}.eq-game .secondary{border-color:color-mix(in srgb,var(--border)50%,var(--purple));color:color-mix(in srgb,var(--ink)85%,var(--purple));background:color-mix(in srgb,var(--panel)80%,var(--purple))}.eq-game .option-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:11px;display:grid}.eq-game .option{text-align:left;align-items:center;gap:12px;min-height:80px;padding:17px;display:flex}.eq-game .option .letter{background:color-mix(in srgb,var(--panel)60%,var(--border-2));width:29px;height:29px;color:color-mix(in srgb,var(--ink)75%,var(--muted));border-radius:7px;flex-shrink:0;place-items:center;font-size:13px;display:grid}.eq-game .equation{font:600 clamp(19px,1.9vw,27px)var(--display);font-variant-numeric:tabular-nums;letter-spacing:-.6px}.eq-game .option.correct{background:color-mix(in srgb,var(--panel)75%,var(--green));border-color:var(--green)}.eq-game .option.wrong{border-color:var(--red);border-color:color-mix(in srgb,var(--red)70%,var(--muted));background:color-mix(in srgb,var(--panel)75%,var(--red));animation:.4s eq-shake}.eq-game .option-grid.unknown{grid-template-columns:1fr}.eq-game .unknown .option{min-height:58px;padding:13px 16px;font-size:17px}.eq-game .feedback{border:1px solid color-mix(in srgb,var(--gold)45%,var(--border));background:color-mix(in srgb,var(--panel)85%,var(--gold));color:color-mix(in srgb,var(--ink)70%,var(--gold));border-radius:10px;min-height:0;margin:16px 0 0;padding:14px 16px;font-size:16px;line-height:1.55}.eq-game .feedback.success{background:color-mix(in srgb,var(--panel)80%,var(--green));border-color:color-mix(in srgb,var(--green)50%,var(--border));color:color-mix(in srgb,var(--ink)70%,var(--green))}.eq-game .steps-list{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:15px 0;display:grid}.eq-game .step-box{border:1px solid color-mix(in srgb,var(--border)60%,var(--purple));background:color-mix(in srgb,var(--panel)85%,var(--purple));border-radius:10px;padding:15px;transition:border-color .2s,box-shadow .2s}.eq-game .step-box:nth-child(2){background:color-mix(in srgb,var(--panel)85%,var(--green));border-color:color-mix(in srgb,var(--border)60%,var(--green))}.eq-game .step-box small{letter-spacing:1.3px;color:color-mix(in srgb,var(--ink)60%,var(--purple));margin-bottom:7px;font-size:12px;display:block}.eq-game .step-box:nth-child(2) small{color:color-mix(in srgb,var(--ink)50%,var(--green))}.eq-game .step-box p{margin:0;font-size:16px}.eq-game .step-box.deciding{border-color:var(--gold);box-shadow:0 0 14px color-mix(in srgb,var(--gold)30%,transparent)}.eq-game .step-box.decided{opacity:.85}.eq-game .op-cards{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-top:12px;display:grid}.eq-game .op-card{text-align:left;justify-content:space-between;align-items:center;gap:8px;min-height:48px;padding:8px 12px;font-size:15px;display:flex}.eq-game .op-card span,.eq-game .op-chip span{font:600 20px var(--display);color:var(--gold)}.eq-game .op-chip{border:1px solid var(--green);background:color-mix(in srgb,var(--panel)75%,var(--green));border-radius:20px;align-items:center;gap:8px;margin-top:10px;padding:6px 11px;font-size:14px;font-weight:600;display:inline-flex}.eq-game .equation-paper{border:1px dashed color-mix(in srgb,var(--border)50%,var(--muted));background:color-mix(in srgb,var(--paper)70%,var(--panel));border-radius:10px;margin:4px 0 8px;padding:14px 16px}.eq-game .equation-paper small{letter-spacing:1.3px;text-transform:uppercase;color:var(--muted);margin-bottom:6px;font-size:12px;display:block}.eq-game .equation-paper p{margin:0}.eq-game .chips{font:600 25px var(--display);flex-wrap:wrap;align-items:center;gap:10px;margin:16px 0;display:flex}.eq-game .math-chip{font:600 24px var(--display);border-color:color-mix(in srgb,var(--purple)75%,var(--border));background:color-mix(in srgb,var(--panel)75%,var(--purple));color:color-mix(in srgb,var(--ink)85%,var(--purple))}.eq-game .math-chip.step1{border-color:color-mix(in srgb,var(--green)65%,var(--border));background:color-mix(in srgb,var(--panel)78%,var(--green));color:color-mix(in srgb,var(--ink)80%,var(--green))}.eq-game .math-chip[aria-pressed=true]{outline:2px solid var(--ink);outline-offset:2px;box-shadow:none}.eq-game .explanation{border-left:3px solid var(--green);background:color-mix(in srgb,var(--panel)88%,var(--green));padding:14px;font-size:16px;line-height:1.6}.eq-game .laser{pointer-events:none;z-index:4;width:100%;height:100%;filter:drop-shadow(0 0 5px var(--purple));position:absolute;inset:0;overflow:visible}.eq-game .laser path{stroke-dasharray:1;animation:.5s ease-out eq-beam}.eq-game .model{background:color-mix(in srgb,var(--paper)75%,var(--panel));border:1px solid color-mix(in srgb,var(--border)75%,var(--muted));border-radius:12px;margin:16px 0;padding:17px}.eq-game .model h3{color:color-mix(in srgb,var(--ink)85%,var(--muted));font-size:15px}.eq-game .group-model{flex-wrap:wrap;gap:8px;margin:10px 0;display:flex}.eq-game .group-unit{border:1px solid color-mix(in srgb,var(--purple)70%,var(--border));text-align:center;min-width:48px;font:600 19px var(--display);color:color-mix(in srgb,var(--ink)85%,var(--purple));border-radius:8px;padding:10px}.eq-game .group-unit .quantity{color:color-mix(in srgb,var(--ink)75%,var(--purple));padding:3px;display:inline-block}.eq-game .group-unit .quantity.two{color:var(--green)}.eq-game .model-line{font:600 22px 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