:root{--ink:#17211f;--muted:#687672;--line:#d8e1de;--paper:#f5f7f5;--card:#fff;--green:#177c6e;--green2:#dff1eb;--hat:#e59a3a;--turtle:#247f89;--seed:#7a6aa6}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,sans-serif}.app-shell{min-height:100vh;display:grid;grid-template-columns:350px minmax(0,1fr)}.sidebar{background:#fbfcfb;border-right:1px solid var(--line);padding:24px;display:flex;flex-direction:column;gap:20px;overflow:auto}.sidebar header{display:grid;gap:7px}.eyebrow,.section-label{margin:0;color:var(--green);font-size:11px;font-weight:800;letter-spacing:.12em;text-transform:uppercase}.eyebrow a{color:inherit}h1{font-family:Georgia,serif;font-size:31px;margin:0}.sidebar header>p:last-child{color:var(--muted);font-size:13px;line-height:1.45;margin:0}.sidebar section{display:grid;gap:9px}.mode-switch{display:grid;grid-template-columns:1fr 1fr;gap:7px}.mode-button{display:grid;gap:4px;text-align:left;padding:10px;border:1px solid var(--line);background:#fff;border-radius:9px}.mode-button small{color:var(--muted);line-height:1.2}.mode-button.active{border-color:var(--green);background:var(--green2);color:var(--green)}button,input,select{font:inherit}button{cursor:pointer}.field{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:9px;font-size:12px;font-weight:700}.field select{grid-column:1/-1;width:100%;padding:8px;border:1px solid var(--line);border-radius:7px;background:#fff}.field input[type=range]{width:100%}.preset-row,.boundary-actions,.run-row{display:flex;gap:7px}.preset-row button,.boundary-actions button,.run-row button{border:1px solid var(--line);border-radius:7px;background:#fff;padding:8px 10px}.hint{font-size:11px;line-height:1.4;color:var(--muted);margin:0}.boundary-actions span{margin-left:auto;font-size:11px;color:var(--muted);align-self:center}.tile-checks{display:grid;grid-template-columns:1fr 1fr;gap:7px}.tile-checks label{display:flex;align-items:center;gap:6px;border:1px solid var(--line);border-radius:8px;padding:9px;background:#fff;font-size:12px;font-weight:700}.swatch{width:12px;height:12px;border-radius:3px}.swatch.hat{background:var(--hat)}.swatch.turtle{background:var(--turtle)}.learning-card{border:1px solid #bdd5ce!important;background:var(--green2);border-radius:10px;padding:11px}.learning-card div{display:flex;justify-content:space-between;font-size:12px}.learning-card p{font-size:11px;color:#41645d;line-height:1.35;margin:0}.run-row{margin-top:auto}.run-row button{flex:1}.run-row .primary{background:var(--green);border-color:var(--green);color:#fff;font-weight:800}.run-row button:disabled{opacity:.45;cursor:not-allowed}.status{min-height:34px;margin:0;color:var(--muted);font-size:12px;line-height:1.4}.stage{position:relative;min-width:0;display:grid;grid-template-rows:minmax(0,1fr) auto auto;background:#edf2f0}canvas{width:100%;height:100%;min-height:500px;display:block}.legend{position:absolute;top:16px;left:16px;display:flex;gap:12px;background:rgba(255,255,255,.9);border:1px solid var(--line);border-radius:8px;padding:8px 10px;font-size:11px}.legend span{display:flex;align-items:center;gap:5px}.legend i{width:9px;height:9px;border-radius:50%}.seed-dot{background:var(--seed)}.hat-dot{background:var(--hat)}.turtle-dot{background:var(--turtle)}.metrics{display:grid;grid-template-columns:repeat(7,1fr);border-top:1px solid var(--line);background:#fff}.metrics div{padding:12px;border-right:1px solid var(--line)}.metrics b,.metrics span{display:block}.metrics b{font-size:19px}.metrics span{font-size:10px;color:var(--muted)}.comparison-status{margin:0;padding:8px 16px;background:#f7faf9;border-top:1px solid var(--line);font-size:11px;color:var(--muted)}.audit{background:#fff;border-top:1px solid var(--line);padding:10px 16px;font-size:11px;color:var(--muted);max-height:130px;overflow:auto}.audit ol{margin:8px 0}.audit li{margin:3px 0}@media(max-width:850px){.app-shell{grid-template-columns:1fr}.sidebar{border-right:0;border-bottom:1px solid var(--line)}.stage{min-height:700px}.metrics{grid-template-columns:repeat(3,1fr)}}