:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--page:#f5f5f7;--surface:#fff;--raised:#eeeef2;--canvas:#f1f4f8;--text:#1d1d1f;--text-secondary:#424245;--muted:#667080;--border:#141e3217;--border-strong:#141e3226;--soft-fill:#141e320d;--accent:#1766cf;--accent-hover:#1255af;--accent-soft:#e8f0ff;--on-accent:#fff;--trace:#175bc5;--edge:#929eae;--danger:#c72d44;--success:#187b43;--success-soft:#e7f7ed;--on-success:#fff;--uncolored-vertex:#d5dbe5;--vertex-label:#202938}:root[data-appearance=dark]{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--page:#111318;--surface:#1b1f27;--raised:#262c36;--canvas:#151a22;--text:#eef1f6;--text-secondary:#c1c9d6;--muted:#a0adbf;--border:#d7e6ff17;--border-strong:#d7e6ff2b;--soft-fill:#d7e6ff0d;--accent:#8ab4ff;--accent-hover:#accaff;--accent-soft:#253651;--on-accent:#112340;--trace:#9fc4ff;--edge:#65768e;--danger:#ff8795;--success:#69d99a;--success-soft:#193c2e;--on-success:#102c1d;--uncolored-vertex:#526176;--vertex-label:#fff}*{box-sizing:border-box}body{background:var(--page);color:var(--text);margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}button,select{font:inherit}.app{min-height:100vh;padding:48px 5vw}.hero{max-width:900px;margin-bottom:40px}.eyebrow{color:var(--accent);letter-spacing:.08em;text-transform:uppercase;margin:0 0 12px;font-size:.78rem;font-weight:800}.hero h1{letter-spacing:-.06em;margin:0;font-size:clamp(4rem,12vw,9rem);line-height:.9}.heroText{color:var(--text-secondary);max-width:700px;font-size:clamp(1.1rem,2vw,1.5rem);font-weight:500;line-height:1.5}.homeApp{align-items:center;max-width:1280px;min-height:calc(100svh - 80px);margin:0 auto;padding:56px 4vw;display:flex}.homeChallenge{grid-template-columns:minmax(0,1.15fr) minmax(300px,.9fr);align-items:center;gap:clamp(32px,5vw,72px);width:100%;display:grid}.homeCopy{min-width:0}.homeCopy .eyebrow{margin-bottom:18px;font-size:.72rem}.homeCopy h1{letter-spacing:-.055em;margin:0 0 22px;font-size:clamp(2.8rem,5vw,4.7rem);font-weight:780;line-height:1.06}.homeCopy h1 span{display:block}.homeCopy .heroText{color:var(--text-secondary);max-width:450px;margin:0;font-size:1.02rem;font-weight:400;line-height:1.75}.homeStats{color:var(--muted);flex-wrap:wrap;gap:10px 18px;margin-top:22px;font-size:.78rem;display:flex}.homeStats span{align-items:center;gap:8px;display:inline-flex}.homeStats span:before{content:"";background:var(--accent);border-radius:50%;width:4px;height:4px}.homeActions{grid-template-columns:1fr 1fr;gap:12px;margin-top:30px;display:grid}.homeActions button{text-align:center;border-radius:12px;justify-content:center;align-items:center;gap:12px;width:100%;min-width:0;min-height:52px;margin:0;padding:14px 18px;font-size:.92rem;font-weight:650;line-height:1.4;display:inline-flex}.homeActions .primaryHomeButton{background:var(--accent);color:var(--on-accent);border:1px solid #0000}.homeActions .primaryHomeButton:hover{background:var(--accent-hover)}.homeActions .secondaryHomeButton{background:var(--surface);color:var(--text);border:1px solid var(--border-strong)}.homeActions .secondaryHomeButton:hover{background:var(--raised)}.homeCopy .randomHomeButton{width:100%;min-height:44px;color:var(--text-secondary);background:0 0;border-radius:10px;justify-content:center;align-items:center;gap:10px;margin:8px 0 0;padding:10px 12px;font-size:.86rem;font-weight:550;display:inline-flex}.homeCopy .randomHomeButton:hover{background:var(--soft-fill);color:var(--text)}.homeMeta{border-top:1px solid var(--border);color:var(--muted);justify-content:space-between;align-items:center;gap:12px;margin-top:22px;padding-top:14px;font-size:.78rem;display:flex}.homeMeta .shareHomeButton{width:auto;min-height:44px;color:var(--text-secondary);white-space:nowrap;background:0 0;border-radius:4px;align-items:center;gap:8px;margin:0;padding:8px 0;font-size:.8rem;font-weight:550;display:inline-flex}.homeMeta .shareHomeButton:hover{color:var(--accent);filter:none;background:0 0}.homePreviewCard{background:var(--surface);border:1px solid var(--border-strong);border-radius:24px;justify-self:center;width:100%;max-width:440px;padding:24px;box-shadow:0 12px 40px #0000000d}.previewCardHeader{color:var(--muted);justify-content:space-between;align-items:center;gap:12px;font-size:.72rem;display:flex}.previewCardHeader>span:first-child{text-transform:uppercase;letter-spacing:.08em;font-size:.65rem;font-weight:650}.previewGraph{padding:18px 0 10px}.previewSvg{width:100%;height:auto;display:block}.previewSvg line{stroke:var(--edge);stroke-width:3px;stroke-linecap:round}.previewSvg circle{stroke:var(--surface);stroke-width:5px}.previewRed{fill:#ff535f}.previewBlue{fill:#458bff}.previewYellow{fill:#f5c849}.previewCaption{border-top:1px solid var(--border);align-items:center;gap:10px;padding-top:18px;display:flex}.previewSolvedMark{background:var(--success-soft);width:30px;height:30px;color:var(--success);border-radius:50%;flex-shrink:0;place-items:center;font-weight:650;display:grid}.previewCaption strong{color:var(--text);font-size:.82rem;font-weight:650;line-height:1.5;display:block}.previewCaption p{color:var(--muted);margin:2px 0 0;font-size:.74rem;line-height:1.5}@media (width<=900px){.homeApp{align-items:flex-start;padding:40px 5vw}.homeChallenge{grid-template-columns:1fr;gap:40px;max-width:560px;margin:0 auto}.homeCopy h1{font-size:clamp(2.5rem,7vw,4rem)}.homePreviewCard{max-width:420px}}@media (width<=600px){.homeApp{min-height:calc(100svh - 112px);padding:32px 5vw}.homeCopy .eyebrow{margin-bottom:14px}.homeCopy .heroText{font-size:.94rem;line-height:1.7}.homeActions{grid-template-columns:1fr;gap:10px;margin-top:24px}.homePreviewCard{border-radius:18px;padding:20px}}@media (width<=360px){.homeCopy h1{font-size:2.2rem}.homeStats{gap:10px 12px;font-size:.72rem}}.shareMessage{color:var(--success);margin-top:12px;font-weight:800}.installPrompt{background:var(--surface);border:1px solid var(--border);max-width:620px;box-shadow:0 18px 44px var(--border-strong);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);border-radius:24px;gap:16px;margin:24px auto 0;padding:18px;display:grid;position:relative}.installPromptText{gap:6px;padding-right:28px;display:grid}.installPromptText h3{letter-spacing:-.03em;margin:0;font-size:1.2rem}.installPromptText p{color:var(--muted);margin:0;line-height:1.5}.installPromptActions{gap:10px;display:grid}.installPromptActions button{width:100%;margin:0}.installPromptClose{background:var(--soft-fill);width:30px;height:30px;color:var(--text);box-shadow:none;border:none;border-radius:999px;place-items:center;margin:0;padding:0;display:grid;position:absolute;top:12px;right:12px}.installPromptClose:hover{background:var(--border-strong)}.secondaryButton{background:var(--soft-fill);color:var(--text);box-shadow:none}.secondaryButton:hover{background:var(--border-strong)}@media (width>=769px){.installPrompt{display:none}}.gameLayout{grid-template-columns:minmax(0,1fr) 340px;align-items:start;gap:28px;display:grid}.gameLayoutSolved{grid-template-columns:minmax(0,1fr)}.gameLayoutSolved .gamePanel{width:100%;max-width:1100px;margin:0 auto}.gamePanel,.statusPanel{background:var(--surface);box-shadow:0 24px 70px var(--border);border:1px solid var(--border);border-radius:34px}.gamePanel{padding:30px}.levelHeader{justify-content:space-between;align-items:flex-start;gap:24px;margin-bottom:24px;display:flex}.levelHeader h2{letter-spacing:-.05em;margin:0 0 10px;font-size:clamp(2rem,4vw,3.4rem)}.levelHeader p{color:var(--text-secondary);max-width:680px;margin:0;font-weight:500;line-height:1.6}.gameStatsBar{grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-bottom:18px;display:grid}.gameStatsBar div{background:var(--page);border-radius:18px;padding:14px 16px}.gameStatsBar span{color:var(--muted);letter-spacing:.06em;text-transform:uppercase;margin-bottom:6px;font-size:.72rem;font-weight:900;display:block}.gameStatsBar strong{color:var(--text);letter-spacing:-.04em;font-size:1.35rem;font-weight:900;display:block}.themePicker{background:var(--page);border:1px solid var(--border);border-radius:24px;gap:16px;margin-top:22px;margin-bottom:22px;padding:20px;display:grid}.themePickerHeader h3{letter-spacing:-.03em;margin:0;font-size:1.25rem}.themeColorDots{align-items:center;gap:12px;display:flex}.themeColorDotButton{cursor:pointer;background:0 0;border:none;border-radius:999px;width:auto;margin:0;padding:0}.themeColorDotButton:hover{background:0 0}.themeColorDot{border:4px solid var(--surface);width:46px;height:46px;box-shadow:0 8px 20px #0000002e, 0 0 0 1px var(--border);border-radius:50%;transition:transform .18s,box-shadow .18s;display:block}.themeColorDotButton:hover .themeColorDot{box-shadow:0 12px 26px #00000038, 0 0 0 1px var(--border-strong);transform:translateY(-2px)scale(1.04)}.themePresetGrid{gap:10px;display:grid}.themePresetButton{background:var(--surface);width:100%;color:var(--text);border:1px solid var(--border);box-shadow:none;border-radius:18px;justify-content:space-between;align-items:center;gap:12px;margin:0;padding:12px 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14px;font-weight:700}.graphCanvasWrap{background:radial-gradient(circle at top right, #0071e31f, transparent 34%), var(--page);border-radius:28px;width:100%;position:relative;overflow:hidden}.graphToolbar{z-index:2;position:absolute;top:14px;right:14px}.soundToggle{border:1px solid var(--border);background:var(--surface);width:auto;color:var(--text);box-shadow:0 10px 26px var(--border-strong);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);cursor:pointer;border-radius:999px;align-items:center;gap:7px;margin:0;padding:8px 11px;font-size:.82rem;font-weight:800;line-height:1;display:inline-flex}.soundToggle:hover{background:var(--surface);transform:translateY(-1px)}.soundToggleIcon{background:var(--text);color:#fff;border-radius:50%;place-items:center;width:18px;height:18px;font-size:.78rem;display:grid}.soundToggle.muted{color:var(--muted)}.soundToggle.muted .soundToggleIcon{background:var(--muted)}@media (width<=600px){.graphToolbar{top:10px;right:10px}.soundToggle{padding:8px}.soundToggleText{display:none}}.graphCanvas{width:100%;height:auto;display:block}.edge{stroke:var(--muted);stroke-width:5px;stroke-linecap:round;transition:stroke-width .16s,opacity .16s}.conflictEdge{stroke:var(--danger);stroke-width:8px}.activeEdge{stroke-width:9px;opacity:1}.vertexGroup{cursor:pointer}.vertex{stroke:var(--surface);stroke-width:7px;filter:drop-shadow(0 12px 18px #0000002e);transform-box:fill-box;transform-origin:50%;transition:transform .18s,filter .18s,opacity .18s}.vertexGroup:hover .vertex{filter:drop-shadow(0 16px 24px #0000003d);transform:scale(1.08)}.adjacentVertex{filter:drop-shadow(0 16px 24px #0003);transform:scale(1.06)}.dimmedVertex{opacity:.42}.vertexLabel{pointer-events:none;font-size:18px;font-weight:900}.statusPanel{padding:28px;position:sticky;top:24px}.statusBox{background:var(--page);border-radius:24px;margin-bottom:18px;padding:22px}.statusBox 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var(--border);cursor:pointer;border-radius:34px;padding:34px;transition:transform .2s,box-shadow .2s}.modeCard:hover{box-shadow:0 30px 85px var(--border-strong);transform:translateY(-4px)}.modeCard h2{letter-spacing:-.05em;margin:0 0 18px;font-size:clamp(2.4rem,5vw,4.2rem);line-height:.95}.modeCard p{color:var(--text-secondary);margin-bottom:28px;font-weight:500;line-height:1.6}.modeCard button:disabled{background:var(--uncolored-vertex);cursor:not-allowed}.modeCard button:disabled:hover{background:var(--uncolored-vertex)}.backButton{background:var(--surface);width:auto;color:var(--text);border:1px solid var(--border-strong);margin-bottom:36px}.backButton:hover{background:var(--page)}.completionCard{background:radial-gradient(circle at top right, #34c7592e, transparent 34%), var(--surface);box-shadow:0 24px 70px var(--border-strong);text-align:center;border:1px solid #34c75938;border-radius:28px;margin:0 0 22px;padding:26px;animation:.35s both completionPop}.completionBadge{background:var(--success);color:#fff;border-radius:50%;place-items:center;width:58px;height:58px;margin:0 auto 14px;font-size:2rem;font-weight:900;display:grid;box-shadow:0 14px 28px #34c75952}.completionEyebrow{color:var(--success);letter-spacing:.08em;text-transform:uppercase;margin:0 0 8px;font-size:.78rem;font-weight:900}.completionCard h3{letter-spacing:-.05em;margin:0;font-size:clamp(1.8rem,4vw,3rem)}.completionStats{grid-template-columns:repeat(3,1fr);gap:12px;margin:22px 0;display:grid}.completionStats div{background:var(--page);border-radius:20px;padding:16px}.completionStats span{color:var(--muted);letter-spacing:.06em;text-transform:uppercase;margin-bottom:6px;font-size:.72rem;font-weight:900;display:block}.completionStats strong{letter-spacing:-.04em;font-size:1.5rem}.completionActions{grid-template-columns:1fr 1.4fr;gap:12px;display:grid}.completionActions button{margin-bottom:0}.completionSecondaryButton{background:var(--page);color:var(--text);border:1px solid var(--border-strong)}.completionSecondaryButton:hover{background:var(--raised)}.completionPrimaryButton{background:var(--success)}.completionPrimaryButton:hover{background:#2fb350}@keyframes completionPop{0%{opacity:0;transform:translateY(12px)scale(.98)}to{opacity:1;transform:translateY(0)scale(1)}}.customLayout{grid-template-columns:minmax(0,1fr) 360px;align-items:start;gap:28px;display:grid}.formGroup{margin-bottom:20px}.formGroup label{color:var(--text-secondary);margin-bottom:8px;font-weight:800;display:block}.formGroup input[type=number]{border:1px solid var(--border-strong);background:var(--surface);width:100%;color:var(--text);border-radius:16px;padding:12px 14px;font-weight:700}.formGroup input[type=range]{width:100%}.levelMap{background:var(--surface);border:1px solid var(--border);box-shadow:0 24px 70px 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var(--border-strong)}.secondaryNavigation:hover:not(:disabled){background:var(--page)}.navigationButton:disabled{background:var(--uncolored-vertex);color:var(--muted);cursor:not-allowed}.quickInstructions{background:var(--accent-soft);border:1px solid #0071e32e;border-radius:18px;align-items:center;gap:12px;margin-bottom:18px;padding:14px 16px;display:flex}.quickInstructions p{color:var(--text);margin:0;font-weight:650;line-height:1.45}.instructionIcon{background:var(--accent);color:#fff;border-radius:50%;flex:none;place-items:center;width:30px;height:30px;font-weight:900;display:grid}.graphCanvas,.vertexGroup,.vertexLabel{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}@media (width<=900px){.app{padding:34px 4vw}.homeGrid,.gameLayout{grid-template-columns:1fr}.levelHeader{flex-direction:column}.gameStatsBar{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.gameStatsBar div{min-width:0;padding:12px 10px}.gameStatsBar span{letter-spacing:.035em;white-space:nowrap;font-size:.62rem}.gameStatsBar strong{font-size:1.15rem}select{width:100%}.statusPanel{position:static}.customLayout{grid-template-columns:1fr}.levelMapHeader{flex-direction:column;align-items:flex-start}.levelGrid{grid-template-columns:repeat(2,minmax(0,1fr))}.levelNavigation{grid-template-columns:1fr}.quickInstructions{align-items:flex-start;padding:13px 14px}.quickInstructions p{font-size:.92rem}.completionStats,.completionActions{grid-template-columns:1fr}}button{color:var(--on-accent)}button,input,select,summary,a{-webkit-tap-highlight-color:transparent}button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,a:focus-visible,.graphViewport:focus-visible{outline:3px solid var(--accent);outline-offset:4px}.siteHeader{border-bottom:1px solid var(--border);align-items:center;gap:28px;max-width:1440px;margin:0 auto;padding:18px 3vw;display:flex}.brand{color:var(--text);letter-spacing:-.05em;align-items:center;gap:10px;font-size:1.3rem;font-weight:850;text-decoration:none;display:inline-flex}.brandDots{gap:3px;display:flex}.brandDots i{background:#ff5b65;border-radius:50%;width:9px;height:9px}.brandDots i:nth-child(2){background:#579bff}.brandDots i:nth-child(3){background:#ffd451}.modeNavigation{gap:5px;margin-left:auto;display:flex}.modeNavigation a{color:var(--muted);border-radius:10px;padding:9px 13px;font-size:.88rem;font-weight:650;text-decoration:none}.modeNavigation a:hover,.modeNavigation a.active{background:var(--accent-soft);color:var(--accent)}.appearanceControl{color:var(--muted);align-items:center;gap:8px;font-size:.78rem;display:flex}.appearanceControl select{border-radius:10px;width:auto;min-width:0;padding:8px 28px 8px 10px;font-size:.82rem}.soundToggleIcon{color:var(--surface)}.instructionIcon{color:var(--on-accent)}.completionPrimaryButton,.completionBadge{color:var(--on-success)}.completionPrimaryButton:hover{background:var(--success);filter:brightness(1.08)}.secondaryButton,.backButton,.completionSecondaryButton,.secondaryNavigation,.themePresetButton,.levelButton,.soundToggle{color:var(--text)}.gameApp{max-width:1440px;min-height:0;margin:0 auto;padding:22px 3vw 48px}.gameHeading{justify-content:space-between;align-items:center;gap:20px;margin-bottom:18px;display:flex}.gameHeading .eyebrow{margin-bottom:6px;font-size:.68rem}.gameHeading h1{letter-spacing:-.045em;margin:0;font-size:clamp(1.5rem,3.5vw,2.2rem)}.gameHeading h1 span{color:var(--muted);font-size:.65em;font-weight:500}.gameHeading>p{color:var(--muted);margin:0;font-size:.9rem}.gameApp .gameLayout,.gameApp .customLayout{grid-template-columns:minmax(0,1fr);gap:14px}.gameApp 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