@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap');
:root{--ink:#233b35;--muted:#71807a;--paper:#fafbf8;--line:#dfe5dd;--green:#24775e}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:14px 'DM Sans',system-ui,sans-serif}button,select{font:inherit;color:inherit}button{cursor:pointer;background:white;border:1px solid var(--line);border-radius:8px;padding:9px 12px;transition:background .15s}button:hover{background:#eef3eb}button:disabled{opacity:.4;cursor:default}button:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid #8dc6ad;outline-offset:3px}header{height:88px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 36px;gap:20px}.brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none;font:800 22px Manrope,system-ui}.brand-icon{font-size:42px;color:var(--green)}.brand small{display:block;font:600 9px 'DM Sans',system-ui;letter-spacing:2px;margin-top:5px}.header-note{color:var(--muted);font-size:13px}.quiet{background:transparent}main{display:grid;grid-template-columns:310px minmax(0,1fr);min-height:calc(100vh - 88px)}aside{padding:32px 26px;border-right:1px solid var(--line)}.eyebrow{font-size:10px;font-weight:700;letter-spacing:1.8px;color:var(--green)}h1{font:800 29px/1.25 Manrope,system-ui;letter-spacing:-1.2px;margin:12px 0}p{line-height:1.65}.intro{color:var(--muted);font-size:13px;margin-bottom:28px}section{border-top:1px solid var(--line);padding:20px 0}.section-label{display:flex;gap:12px;font-size:11px;font-weight:700;color:#8c9b8d;letter-spacing:.8px;margin-bottom:14px}.section-label span{color:var(--ink);font-size:12px;letter-spacing:0}.count-line{display:flex;align-items:center;gap:12px;margin-bottom:12px}select{border:1px solid var(--line);border-radius:8px;padding:10px;background:white;font-weight:600}.count-line>span{color:var(--muted)}.button-pair{display:flex;gap:8px}.button-pair button{flex:1;font-size:11px;padding:9px 6px}.hint{font-size:11px;color:var(--muted);margin:12px 0 0}.angles{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px}.angle{padding:7px 9px;border-radius:6px;background:#fff;border:1px solid var(--line);font-weight:600;font-size:12px;border-bottom:3px solid var(--color)}.toggle{display:flex;align-items:center;gap:10px;padding:6px 0;font-size:12px;cursor:pointer}.toggle input{accent-color:var(--green);width:15px;height:15px}.swatch{width:9px;height:9px;border-radius:50%;background:var(--color)}.layer-name{flex:1}.layer-tag{color:var(--muted);font-size:10px}.theorem{padding:16px;background:#eef3e9;border:1px solid #e1e9d9;border-radius:10px;font-size:11px}.theorem strong{font-size:12px}.theorem p{color:#637264}.theorem a{color:var(--green);text-decoration:none}.workspace{padding:30px 32px 16px;min-width:0}.canvas-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}h2{font:700 21px Manrope,system-ui;letter-spacing:-.6px;margin:7px 0 0}#canvas-wrap{position:relative;background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;height:clamp(440px,65vh,760px)}#canvas{width:100%;height:100%;display:block;touch-action:none}.canvas-tip{position:absolute;left:20px;top:18px;color:var(--muted);font-size:11px;display:flex;align-items:center;gap:8px;pointer-events:none}.dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:#4f9f73}.step-controls{position:absolute;bottom:16px;left:50%;transform:translateX(-50%);display:flex;align-items:center;gap:5px;padding:6px;border-radius:12px;background:#ffffffed;border:1px solid var(--line);box-shadow:0 5px 20px #2440320a;white-space:nowrap}.step-controls button{border:none;font-size:12px}.step-controls #final-toggle{background:#edf3e9}.step-controls span{font-size:11px;color:var(--muted);padding:0 10px}.results{display:flex;align-items:center;gap:28px;border:1px solid var(--line);border-radius:12px;padding:21px;margin-top:16px;background:#fff}.results>div:first-child{flex:1}.results strong{display:block;font:700 18px Manrope,system-ui;margin-top:6px}#result-detail{display:block;color:var(--muted);font-size:11px;margin-top:4px}.stat>span{color:var(--muted);font-size:10px}.stat strong{font-size:16px}.status{font-size:11px;color:var(--green);display:flex;gap:7px;align-items:center}footer{display:flex;justify-content:space-between;gap:12px;color:#8a958c;font-size:10px;margin-top:18px}.handle{cursor:grab;outline:none}.handle:active{cursor:grabbing}.handle:focus-visible .halo,.handle.dragging-node .halo{opacity:1}.halo{opacity:0;transition:opacity .15s}.vertex-label{font:11px 'DM Sans',system-ui;fill:#697a73;pointer-events:none}@media(max-width:1100px){.results{gap:16px}.status{display:none}.header-note{display:none}.workspace{padding:24px 20px}main{grid-template-columns:280px minmax(0,1fr)}aside{padding:26px 20px}footer span{display:none}}@media(max-width:760px){header{height:72px;padding:0 18px}.brand{font-size:19px}main{display:flex;flex-direction:column}.workspace{order:0;padding:22px 14px}aside{order:1;border-right:0;border-top:1px solid var(--line);padding:24px}h1 br{display:none}#canvas-wrap{height:480px}.results{padding:16px;flex-wrap:wrap;gap:20px}.results>div:first-child{flex-basis:100%}.canvas-heading h2{font-size:18px}.canvas-tip{font-size:10px}.step-controls span{padding:0 4px}}

.angle{cursor:grab;touch-action:none;user-select:none}.angle:active{cursor:grabbing}.angle-dragging{opacity:.3;border-style:dashed}.angle-ghost{position:fixed;z-index:1000;pointer-events:none;cursor:grabbing;box-shadow:0 6px 18px #233b3530;transform:rotate(-4deg);background:white}

#excluded-zone{border:1px dashed #b7c2b9;border-radius:8px;padding:10px 12px;margin-bottom:12px;background:#f3f5f0;min-height:75px;transition:background .15s,border-color .15s}.excluded-label{display:block;font-size:10px;color:var(--muted);margin-bottom:8px;text-transform:uppercase;letter-spacing:1px}#excluded-angle{margin:0}.drop-active{background:#e1f0e5!important;border-color:var(--green)!important}.angle-drop-target{outline:3px solid #8dc6ad;outline-offset:2px}

#angles{min-height:48px;padding:3px;border:1px dashed #dfe5dd;border-radius:8px}#excluded-angle{min-height:42px}#angles:empty::before{content:'Drop angles here to include';color:var(--muted);font-size:11px;align-self:center;padding:8px}


.canvas-heading{gap:22px;align-items:center}.experiment-heading{flex:0 0 auto}.canvas-options{flex:1;min-width:0;border:0;padding:0}.canvas-options>.eyebrow{margin-bottom:8px}.canvas-options #layers{display:flex;flex-wrap:wrap;gap:4px 14px}.canvas-options .toggle{gap:6px;padding:3px 0;font-size:11px;white-space:nowrap}.canvas-options .toggle input{margin:0}.canvas-options .layer-name{flex:initial}.canvas-options .layer-tag{font-size:9px}.display-options{display:flex;flex-wrap:wrap;gap:4px 16px;margin-top:8px;padding-top:8px;border-top:1px solid var(--line)}#fit{flex-shrink:0}@media(max-width:1200px){.canvas-heading{flex-wrap:wrap;gap:16px}.canvas-options{order:3;flex-basis:100%}.experiment-heading{flex:1}}


.dragging-angle,.dragging-angle *{cursor:grabbing!important}.angle-insertion{position:fixed;width:3px;background:var(--green);z-index:1001;pointer-events:none;transform:translateX(-50%)}.angle-insertion::before{content:'';position:absolute;top:-6px;left:-4px;border-left:5px solid transparent;border-right:5px solid transparent;border-top:7px solid var(--green)}.angle-insertion[hidden]{display:none}

.stage-color{position:relative}.stage-color summary{list-style:none;cursor:pointer;padding:4px;margin:-4px;display:flex;align-items:center;justify-content:center;border-radius:50%}.stage-color summary::-webkit-details-marker{display:none}.stage-color summary:focus-visible{outline:2px solid var(--green);outline-offset:2px}.stage-color summary:hover{background:#dfe9e0}.color-menu{position:absolute;top:22px;left:-10px;width:190px;z-index:50;background:white;border:1px solid var(--line);border-radius:10px;padding:14px;box-shadow:0 6px 24px #233b3526;color:var(--ink)}.color-menu strong{font-size:12px}.color-palette{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:12px 0}.color-palette button{width:28px;height:28px;padding:0;border:2px solid white;border-radius:50%;box-shadow:0 0 0 1px #dfe5dd}.color-palette button:hover{box-shadow:0 0 0 2px var(--green)}.custom-color{display:flex;align-items:center;justify-content:space-between;font-size:11px}.custom-color input{width:40px!important;height:28px!important;cursor:pointer}.layer-control>.layer-name{cursor:pointer}

.edge-target{cursor:pointer}


.outcome-picker{flex:0 0 285px;max-width:100%;display:flex;flex-direction:column;gap:8px}.outcome-picker select{width:100%;font-size:12px}.outcome-picker small{color:var(--muted);font-size:10px}#outcome-angles{display:flex;align-items:center;flex-wrap:wrap;gap:6px}#outcome-angles button{font-size:11px;padding:5px 9px}#outcome-angles button[aria-pressed=true]{background:#e0eee4;border-color:var(--green);color:var(--green)}.outcome-hint{font-size:10px;color:var(--muted)}@media(max-width:1200px){.outcome-picker{flex:1;max-width:350px}}

#outcome-angles{min-height:30px}

.step-controls #final-toggle{width:100px;flex:0 0 100px}.step-controls #step-label{min-width:82px;text-align:center}

.canvas-result{position:absolute;bottom:22px;left:22px;max-width:calc(50% - 190px);pointer-events:none;text-shadow:0 1px 3px white;background:#ffffffb8;border-radius:6px;padding:6px 8px}.canvas-result strong{display:block;font:700 17px Manrope,system-ui;margin-top:5px}.canvas-result #result-detail{font-size:10px}@media(max-width:1100px){.canvas-result{max-width:calc(100% - 40px);bottom:85px;left:16px}.canvas-result strong{font-size:14px}}

.canvas-result{opacity:0;visibility:hidden;transition:none}.canvas-result.is-visible{opacity:1;visibility:visible;transition:opacity 2.5s ease}.canvas-result strong{margin-top:0}@media(prefers-reduced-motion:reduce){.canvas-result.is-visible{transition:none}}



#result-name{transition:opacity 1s ease,filter 1s ease;opacity:1;filter:blur(0)}#result-name.changing-result{opacity:0;filter:blur(3px);transition-duration:1s}@media(prefers-reduced-motion:reduce){#result-name,#result-name.changing-result{transition:none;filter:none}}




.zoom-controls{position:absolute;right:16px;top:16px;display:flex;align-items:center;gap:4px;padding:5px;border:1px solid var(--line);border-radius:10px;background:#fffffff0}.zoom-controls button{padding:6px 9px;border:0}.zoom-controls output{font-size:11px;color:var(--muted);width:44px;text-align:center}

#canvas{cursor:grab}#canvas.panning,#canvas.panning *{cursor:grabbing!important}

.step-controls #select-sides{width:94px;flex:0 0 94px}.step-controls #select-sides[aria-pressed=true]{background:#e0eee4;color:var(--green)}@media(max-width:480px){.step-controls{gap:2px;padding:4px}.step-controls #select-sides{width:78px;flex-basis:78px;font-size:10px;padding:8px 4px}.step-controls #final-toggle{width:70px;flex-basis:70px}.step-controls #step-label{min-width:65px;font-size:10px}}

.step-controls #select-sides{width:40px;flex:0 0 40px;padding:9px 6px}

.step-controls #select-sides:not([aria-pressed=true]):hover{background:#eef3eb}.step-controls #select-sides[aria-pressed=true]{background:#edf3e9;color:var(--ink)}.step-controls #back:not(:disabled):hover,.step-controls #next:not(:disabled):hover,.step-controls #select-sides:not([aria-pressed=true]):hover{background:#f5f8f4}

.layer-heading{display:flex;align-items:center;gap:18px;margin-bottom:8px}.canvas-options .layer-heading .toggle{font-size:10px}

footer a{color:inherit;text-decoration:underline;text-underline-offset:2px}footer a:hover{color:var(--green)}

header{position:relative}.header-title{position:absolute;left:50%;transform:translateX(-50%);margin:0;white-space:nowrap;font:800 29px/1.25 Manrope,system-ui;letter-spacing:-1.2px}aside{padding-top:20px}aside>section:first-child{border-top:0;padding-top:8px}@media(max-width:1150px){header{height:auto;min-height:88px;flex-wrap:wrap;justify-content:center;padding:16px 24px;gap:12px}.header-title{position:static;transform:none;text-align:center;flex-basis:100%;font-size:25px}main{min-height:calc(100vh - 120px)}}@media(max-width:760px){.header-title{font-size:22px;white-space:normal}}

aside .outcome-picker{margin-top:20px;flex:initial;width:100%;max-width:none}.canvas-heading .canvas-options{flex-basis:100%}

.starting-polygon-label{display:block;margin-bottom:8px}

header .header-title{font:400 13px 'DM Sans',system-ui,sans-serif;letter-spacing:normal;color:var(--muted)}

header .header-title{font-style:italic}

.canvas-heading{align-items:flex-start;flex-wrap:nowrap}.canvas-heading .canvas-options{flex:1;flex-basis:auto}.canvas-heading>.theorem{flex:0 0 330px;padding:12px 16px}.canvas-heading>.theorem p{margin:6px 0}@media(max-width:1200px){.canvas-heading{flex-wrap:wrap}.canvas-heading .canvas-options{order:0;flex-basis:100%}.canvas-heading>.theorem{flex-basis:100%}}

.canvas-heading{align-items:center}.canvas-heading>.theorem{flex:0 0 410px;padding:10px 14px;font-size:10px;line-height:1.4}.canvas-heading>.theorem p{line-height:1.4;margin:4px 0}.canvas-heading>.theorem strong{font-size:11px}@media(max-width:1200px){.canvas-heading>.theorem{flex-basis:100%}}

.workspace footer{position:relative;align-items:center}.theorem-credit{position:absolute;left:50%;transform:translateX(-50%);white-space:nowrap;color:var(--muted)}@media(max-width:760px){.workspace footer{flex-wrap:wrap;justify-content:center}.theorem-credit{position:static;transform:none;flex-basis:100%;text-align:center}}

.canvas-result{opacity:0;visibility:hidden;transition:opacity .5s ease,visibility 0s linear .5s}.canvas-result.is-visible{opacity:1;visibility:visible;transition:opacity 2.5s ease,visibility 0s}@media(prefers-reduced-motion:reduce){.canvas-result,.canvas-result.is-visible{transition:none}}






header>.theorem{width:440px;margin-left:auto;padding:7px 12px;font-size:9px;line-height:1.3}header>.theorem strong{font-size:10px}header>.theorem p{line-height:1.3;margin:3px 0}header>.theorem a{font-size:9px}.canvas-heading .canvas-options{width:100%;flex:1 1 100%}@media(max-width:1150px){header>.theorem{margin:0;width:min(100%,560px)}header .header-title{flex-basis:auto;position:static;transform:none}}

header{height:auto;min-height:88px;padding-top:8px;padding-bottom:8px}header>.theorem{font-size:10px}header>.theorem strong{font-size:11px}header>.theorem a{font-size:10px}

.sidebar-tagline{font:italic 400 13px 'DM Sans',system-ui,sans-serif;color:var(--muted);margin:20px 0 0;line-height:1.6}

.layer-heading{flex-wrap:wrap}.final-color-circle{position:relative;display:flex;align-items:center;justify-content:center;width:18px;height:18px;cursor:pointer}.final-color-circle .swatch{width:11px;height:11px}.canvas-options .final-color-circle input{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:pointer}