.triangle-back{font-size:11px;color:var(--muted)}.triangle-intro{margin:30px 0}.triangle-intro h1{font-size:clamp(32px,3.7vw,48px)}.triangle-intro .lead{margin-bottom:0}.triangle-mode{display:flex;gap:8px;margin:35px 0 18px;background:#e9edf6;padding:6px;border-radius:15px;width:fit-content}.triangle-mode button{border:0;background:transparent;border-radius:11px;padding:13px 23px;font:inherit;font-size:12px;font-weight:700;color:var(--muted);cursor:pointer}.triangle-mode button[aria-pressed=true]{background:#fff;color:var(--blue);box-shadow:0 3px 8px #23335b0b}.triangle-workspace{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:22px;align-items:start}.geometry-panel{border:1px solid #dce5fc;border-radius:23px;overflow:hidden;background:#f0f4ff}.geometry-top{padding:20px 23px;display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:11px;font-weight:700}.geometry-top button{font:inherit;font-size:10px;color:var(--muted);background:#fff;border:1px solid var(--line);border-radius:20px;padding:9px 13px;cursor:pointer}#geometry{display:block;width:100%;height:auto;touch-action:none;-webkit-user-select:none;user-select:none}.vertex{cursor:grab;outline:none}.vertex:active{cursor:grabbing}.vertex:focus-visible circle:last-of-type{stroke:#c57536;stroke-width:6}.vertex text{font:700 17px Outfit,sans-serif;fill:#23335b;pointer-events:none}.diagram-angle{cursor:pointer}.angle-value{font:700 16px Outfit,sans-serif;paint-order:stroke;stroke:#f7f9ff;stroke-width:5;stroke-linejoin:round}.geometry-bottom{display:flex;justify-content:space-between;gap:12px;padding:18px 23px;border-top:1px solid #dce5fc;font-size:10px;color:var(--muted);align-items:center}.drag-dot{display:inline-block;width:9px;height:9px;background:#fff;border:2px solid var(--blue);border-radius:50%;margin-right:4px}.unknown-key{color:#a45d2b;white-space:nowrap;background:#ffedc7;padding:6px 9px;border-radius:7px}.straight-note{font-size:11px;line-height:1.9;margin:0;padding:0 23px 20px;color:var(--muted)}.calculation-panel{padding:25px;border:1px solid var(--line);border-radius:23px;background:#fff}.calculation-panel .eyebrow{font-size:9px;margin-bottom:15px}.calculation-panel h2{font-size:20px}.angle-choices{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:7px;margin:18px 0 23px}.angle-choices button{font:inherit;font-size:11px;line-height:1.7;border:1px solid #d9e1f5;background:#f5f7ff;color:var(--blue);border-radius:9px;padding:9px 3px;cursor:pointer}.angle-choices button.right-angle{color:#a5612e;background:#fff8ee;border-color:#ecdcc7}.angle-choices button.selected{box-shadow:inset 0 0 0 2px #bc7439;background:#fff0d2;border-color:transparent;color:#94521f}.angle-choices small{display:block;font-size:10px;font-family:Outfit,sans-serif}.answer-heading{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px;border-top:1px solid var(--line);padding-top:20px}.answer-heading>span{font-size:12px;font-weight:700}.answer-heading button{font:inherit;font-size:10px;border:0;border-bottom:1px solid var(--line);padding:4px 0;color:var(--muted);cursor:pointer;background:#fff}.answer-number{font-size:59px;font-weight:600;color:var(--blue);margin:9px 0 20px;line-height:1.2;font-variant-numeric:tabular-nums}.answer-number>span{font-size:33px;margin-left:3px}.calculation-steps{list-style:none;padding:0;margin:0;display:grid;gap:12px}.calculation-steps li{background:#f4f6fc;border:1px solid #e7ecf7;border-radius:12px;padding:14px}.calculation-steps li:last-child{background:#fff6df;border-color:#f1e7cc}.calculation-steps li>div{display:flex;gap:8px;align-items:start}.calculation-index{display:grid;place-items:center;flex-shrink:0;background:#fff;color:var(--blue);border-radius:6px;width:20px;height:20px;font-size:10px}.calculation-steps strong{font-size:11px;line-height:1.8}.calculation-steps p{margin:10px 0 0;padding-left:28px;font-variant-numeric:tabular-nums}.step-angle{display:block;font-size:11px;color:var(--muted);margin-bottom:4px}.live-expression{display:block;font-size:16px;line-height:1.8;font-weight:500;overflow-wrap:anywhere}.step-result{display:block;font-size:21px;font-weight:700;color:var(--blue);margin-top:4px}.rounding-note{font-size:9px;line-height:1.9;color:var(--muted);margin:20px 0 0}.think-prompt{background:#fff6df;border-radius:13px;padding:20px}.think-prompt strong{font-size:13px}.think-prompt p{font-size:12px;line-height:2}.think-prompt>span{font-size:10px;color:var(--muted);line-height:1.9}.triangle-status{font-size:11px;color:var(--muted);line-height:1.9;min-height:2em;margin:14px 4px 0}.triangle-examples{margin:43px 0 30px}.shape-presets{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.shape-presets button{font:inherit;display:flex;flex-direction:column;align-items:start;gap:10px;text-align:left;color:#23335b;border:1px solid var(--line);background:#fff;border-radius:17px;padding:22px;cursor:pointer;transition:transform .15s}.shape-presets button:hover{transform:translateY(-3px)}.shape-presets button>span{font-size:33px;color:var(--blue);height:43px}.shape-presets strong{font-size:13px}.shape-presets small{font-size:10px;line-height:1.8;color:var(--muted)}.triangle-rules{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:0 0 50px}.triangle-rules>div{border-radius:20px;background:#eaf0ff;padding:28px}.triangle-rules>div:last-child{background:#fff4da}.rule-number{font-size:10px;color:var(--blue);font-weight:700}.triangle-rules h2{font-size:18px;margin-top:12px}.triangle-rules p{font-size:11px;line-height:2;color:var(--muted);margin:12px 0 18px}.triangle-rules strong{font-size:14px;color:var(--blue)}.triangle-mode button:focus-visible,.shape-presets button:focus-visible,.calculation-panel button:focus-visible,.geometry-top button:focus-visible{outline:3px solid var(--blue);outline-offset:4px}@media(max-width:1000px){.triangle-workspace{grid-template-columns:minmax(0,1fr) 310px;gap:15px}.calculation-panel{padding:20px}.geometry-bottom{padding:15px;flex-wrap:wrap}.geometry-top{padding:17px}.shape-presets{grid-template-columns:repeat(2,minmax(0,1fr))}.triangle-rules h2{font-size:16px}}@media(max-width:750px){.triangle-workspace{grid-template-columns:1fr}.triangle-back{font-size:9px}.triangle-intro{margin-top:18px}.triangle-intro h1{font-size:clamp(29px,7.2vw,40px)}.triangle-mode{margin-top:27px;width:100%}.triangle-mode button{padding:12px 8px;flex:1;font-size:11px}.geometry-top{padding:16px;font-size:10px}.geometry-top button{font-size:9px;padding:8px}.geometry-bottom{font-size:9px;gap:8px;padding:13px}.straight-note{font-size:10px;padding:0 15px 15px}.calculation-panel{padding:23px}.angle-choices{grid-template-columns:repeat(3,minmax(0,1fr))}.answer-number{font-size:52px}.calculation-steps p{display:flex;flex-wrap:wrap;gap:4px 8px;align-items:center;padding-left:0}.step-angle{width:100%;margin-bottom:0}.step-result{margin-top:0}.live-expression{font-size:17px}.triangle-status{font-size:10px}.triangle-examples{margin-top:30px}.triangle-examples h2{font-size:21px}.shape-presets{gap:10px}.shape-presets button{padding:18px 14px}.shape-presets strong{font-size:12px}.triangle-rules{grid-template-columns:1fr;gap:13px;margin-bottom:35px}.triangle-rules>div{padding:23px}.triangle-rules h2{font-size:17px}}@media(max-width:750px){.angle-value{font-size:20px}.vertex text{font-size:22px}.vertex circle:first-of-type{r:28px}}.set-squares-lab{margin:48px 0 35px;padding-top:35px;border-top:1px solid var(--line)}.square-intro{font-size:12px;line-height:1.9;color:var(--muted);margin:10px 0 0}.square-examples{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 18px}.square-examples button,.square-targets button{font:inherit;font-size:11px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:11px 14px;color:#23335b;cursor:pointer}.square-examples button[aria-pressed=true],.square-targets button[aria-pressed=true]{background:#fff0d2;border-color:#bc7439;color:#94521f;box-shadow:inset 0 0 0 1px #bc7439}.square-targets{display:flex;flex-wrap:wrap;gap:7px;margin:18px 0 22px}#square-diagram{display:block;width:100%;height:auto;touch-action:none;-webkit-user-select:none;user-select:none}.square-angle-label{font:700 23px Outfit,sans-serif;paint-order:stroke;stroke:#fff6df;stroke-width:5px}.square-known{font:700 20px Outfit,sans-serif;paint-order:stroke;stroke:#f4f7ff;stroke-width:4px}.square-baseline{font-size:13px;fill:#66718b}.square-handle{cursor:grab;outline:none}.square-handle:active{cursor:grabbing}.square-handle:focus-visible circle:last-child{stroke:#3157ed;stroke-width:6px}.square-legend{display:flex;flex-wrap:wrap;gap:12px;padding:16px 22px;border-top:1px solid var(--line);font-size:11px}.square-legend label{display:flex;align-items:center;gap:5px}.square-legend input{accent-color:var(--blue)}.square-legend label:nth-child(2) input{accent-color:#c57536}.square-rotation{padding:10px 23px 20px}.square-rotation label{display:flex;justify-content:space-between;gap:10px;font-size:12px;font-weight:700}.square-rotation output{color:#a5612e}.square-rotation input{display:block;width:100%;margin:18px 0 12px;accent-color:#c57536}.square-rotation p{font-size:10px;line-height:1.8;color:var(--muted);margin:0}.set-squares-lab button:focus-visible,.set-squares-lab input:focus-visible{outline:3px solid var(--blue);outline-offset:4px}@media(max-width:750px){.set-squares-lab{margin-top:30px;padding-top:26px}.set-squares-lab h2{font-size:21px}.square-intro{font-size:11px}.square-examples{gap:6px}.square-examples button{font-size:10px;padding:10px}.square-legend{gap:9px;font-size:10px;padding:14px}.square-rotation{padding:10px 15px 18px}.square-rotation label{font-size:11px}.square-known{font-size:24px}.square-angle-label{font-size:27px}}.square-jump{display:flex;align-items:center;font-size:12px;font-weight:700;padding:13px 18px;color:#a5612e;border-radius:11px;background:#fff4db}#set-squares-lab{scroll-margin-top:24px}@media(max-width:750px){.triangle-mode{flex-wrap:wrap}.square-jump{justify-content:center;flex-basis:100%;font-size:11px;padding:11px}}.square-edit-options{padding:15px 22px;border-top:1px solid var(--line);background:#fff8e9;font-size:11px}.square-edit-options label{display:flex;align-items:center;gap:6px;font-weight:700}.square-edit-options input{accent-color:var(--blue)}.square-edit-options>span{display:block;font-size:10px;line-height:1.8;color:var(--muted);margin-top:7px}.square-vertex-panel{padding:20px 22px;border-top:1px solid var(--line);background:#fff}.square-vertex-panel h3{font-size:14px;margin:0 0 9px}.square-vertex-panel>p{font-size:10px;line-height:1.9;color:var(--muted);margin:0 0 13px}.square-vertex-angles{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.square-vertex-angles label{display:flex;align-items:center;gap:7px;padding:11px 9px;border-radius:9px;border:1px solid #dce5fc;font-size:11px;background:#f1f5ff;color:#3157ed;cursor:pointer}.square-vertex-angles .orange-angle-card{background:#fff5e5;color:#a5612e;border-color:#eedfc6}.square-vertex-angles input{accent-color:currentColor;margin:0}.square-vertex-angles strong{margin-left:auto;font-size:18px;font-variant-numeric:tabular-nums}.square-vertex-value{font:700 15px Outfit,sans-serif;paint-order:stroke;stroke:#f7f9ff;stroke-width:5px;pointer-events:none}#square-reveal-vertices{font:inherit;font-size:11px;margin-top:14px;padding:11px 15px;border:1px solid var(--line);background:#fff4da;border-radius:10px;color:#94521f;cursor:pointer}#square-reveal-vertices[hidden]{display:none}#square-vertex-solutions{font-size:12px;line-height:2;color:#536384}#square-vertex-solutions p{margin:12px 0 0}@media(max-width:750px){.square-vertex-panel{padding:18px 14px}.square-vertex-angles{gap:5px}.square-vertex-angles label{flex-wrap:wrap;padding:10px 7px;font-size:10px;gap:5px}.square-vertex-angles strong{font-size:17px}.square-vertex-value{font-size:20px}}