:root{color-scheme:light;--ink:#192244;--muted:#626981;--paper:#f8f9f4;--line:#e3e6de;--green:#c1f44c;--pink:#f02088;--radius:24px;font-family:'Trebuchet MS',Verdana,Arial,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,select{font:inherit}button{cursor:pointer;color:inherit}button:disabled{opacity:.38;cursor:default}button:focus-visible,select:focus-visible,summary:focus-visible,canvas:focus-visible{outline:3px solid #6449e9;outline-offset:4px}button{transition:background .18s,transform .18s}button:not(:disabled):active{transform:translateY(1px)}[hidden]{display:none!important}.shell{max-width:1192px;padding:30px 36px 20px;margin:auto}.header{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:28px}.brand{display:flex;align-items:center;gap:14px}.brand-mark{display:grid;place-items:center;background:var(--ink);color:var(--green);font-size:48px;border-radius:16px;width:62px;height:62px;transform:rotate(-7deg)}.eyebrow{font-size:11px;letter-spacing:1.7px;font-weight:800;margin:0 0 6px}.brand .eyebrow{color:var(--muted)}h1{margin:0;font-size:34px;letter-spacing:-1.5px;line-height:1.1}h1 span{color:#dc1678}.help-button{display:flex;align-items:center;gap:8px;background:transparent;border:1px solid #d9ddd3;padding:11px 16px;border-radius:24px;font-size:14px;font-weight:700}.help-button span{border:1.5px solid currentColor;border-radius:50%;width:20px;height:20px;display:grid;place-items:center}.modes{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:12px;margin-bottom:24px;max-width:760px}.mode{display:flex;min-width:0;align-items:center;gap:14px;border:2px solid var(--line);border-radius:16px;text-align:left;padding:14px 18px;background:white;font-weight:800;font-size:18px}.mode small{display:block;font-size:13px;font-weight:400;color:var(--muted);margin-top:4px}.mode-number{background:#edf0e8;padding:9px 8px;border-radius:9px;font-size:18px}.mode.active{background:var(--ink);border-color:var(--ink);color:white;box-shadow:0 5px 0 #c1f44c}.mode.active small{color:#d3d8e7}.mode.active .mode-number{background:var(--green);color:var(--ink)}.mode-line{font-size:34px;margin-left:auto;line-height:1;color:#e7388f}.mode.active .mode-line{color:var(--green)}.play-layout{display:grid;grid-template-columns:minmax(0,760px) minmax(245px,1fr);gap:24px;align-items:start}.play-card{background:white;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:0 8px 22px #19224405}.board-header{display:flex;align-items:center;justify-content:space-between;padding:24px 26px 12px;gap:12px}.board-header h2{margin:0;font-size:23px;letter-spacing:-.65px}.board-header .eyebrow{color:#737991;font-size:10px}.level-select{font-size:12px;display:flex;align-items:center;gap:8px;color:var(--muted)}select{border:1px solid #dce1d5;border-radius:10px;padding:10px 26px 10px 10px;background:#f7f9f2;color:var(--ink);font-size:14px;font-weight:700;max-width:145px}.board-meta{display:flex;justify-content:space-between;gap:10px;font-size:12px;color:var(--muted);padding:0 26px 10px}.board-meta span:last-child{font-size:10px;font-weight:800;letter-spacing:1px}.scene{position:relative;margin:0 14px;background:#fbfcf9;border:1px solid #edf0e8;border-radius:16px;overflow:hidden}.scene canvas{display:block;width:100%;aspect-ratio:1.16;touch-action:none;cursor:crosshair;-webkit-tap-highlight-color:transparent}.board-footer{display:flex;align-items:center;gap:8px;padding:12px 26px;min-height:60px}.board-footer p{font-size:14px;line-height:1.4;margin:0;flex:1}#active-dot{width:18px;height:12px;border-radius:2px;flex:none;background:#dfe4d6}.actions{display:flex;border-top:1px solid var(--line);padding:12px 18px;gap:8px}.actions button{flex:1;border:0;border-radius:9px;background:#f3f5ee;padding:11px 5px;font-size:14px;font-weight:700}.actions button:hover:not(:disabled){background:#e8eccf}.actions span{font-size:20px;vertical-align:-1px;margin-right:4px}.progress-card{border-radius:var(--radius);border:1px solid var(--line);background:white;padding:24px}.progress-heading{display:flex;align-items:center;justify-content:space-between;gap:10px}.progress-heading h2{font-size:17px;margin:0}.progress-heading>span{font-size:14px;color:var(--muted)}.progress-heading b{font-size:24px;color:var(--ink)}.progress-track{height:7px;border-radius:5px;background:#edf0e7;margin:14px 0 18px;overflow:hidden}#progress-bar{height:100%;width:0;background:#9cdb25;transition:width .3s}.pairs{display:flex;flex-direction:column;gap:7px}.pair{display:flex;align-items:center;gap:10px;width:100%;padding:8px 0;border:0;background:none;text-align:left;font-size:14px;border-radius:8px}.pair:hover{background:#f4f6ef}.pair.active{background:#eef2e5}.pair-swatch{width:31px;height:19px;display:grid;place-items:center;transform:rotate(-3deg);border-radius:2px;color:white;font-size:12px;font-weight:800}.pair-state{margin-left:auto;font-size:12px;color:#6c7287}.pair.connected .pair-state{font-size:18px;color:#588216}.microcopy{font-size:12px;line-height:1.55;color:var(--muted);border-top:1px solid var(--line);padding-top:16px;margin:14px 0 0}.tip-card{background:var(--ink);color:white;border-radius:var(--radius);padding:25px 24px;margin-top:18px;position:relative;overflow:hidden}.tip-tag{font-size:9px;letter-spacing:1.4px;font-weight:800;color:var(--green)}.tip-card h2{font-size:26px;line-height:1.15;letter-spacing:-.8px;margin:16px 0}.tip-card p{font-size:14px;line-height:1.6;color:#d4d8e7;margin:0}.tip-rule{display:flex;align-items:center;gap:10px;border-top:1px solid #ffffff25;margin-top:20px;padding-top:17px;font-size:12px;color:var(--green);line-height:1.4}.tip-rule>span:first-child{font-size:25px}.quiet-note{font-size:12px;text-align:center;color:var(--muted);line-height:1.65;margin:20px 0}.page-footer{display:flex;justify-content:space-between;font-size:11px;color:var(--muted);margin-top:25px}.page-footer span:last-child{font-size:9px;letter-spacing:1.5px}.spatial-controls{padding:12px 20px 0;display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}.height-controls{display:flex;align-items:center;gap:10px;font-size:13px}.height-buttons{display:flex;gap:4px}.height-buttons button{background:#f1f3ec;border:1px solid #e0e5d8;border-radius:9px;padding:8px 10px;font-weight:800;font-size:15px;min-width:50px}.height-buttons small{display:block;font-size:10px;font-weight:400;margin-top:2px}.height-buttons button[aria-pressed=true]{background:var(--green);border-color:#acd442}.camera-controls{display:flex;gap:4px}.camera-controls button{border:1px solid #e0e5d8;background:white;border-radius:9px;min-height:41px;padding:8px 9px;font-size:12px}.camera-controls button:first-child,.camera-controls button:last-child{font-size:22px;padding:3px 11px}.camera-controls button[aria-pressed=true]{background:var(--ink);color:white}.win{position:absolute;inset:0;background:#f8faf2d9;backdrop-filter:blur(4px);display:grid;place-items:center;padding:22px}.win-card{max-width:340px;text-align:center}.win-icon{font-size:65px;color:#f02088;line-height:1.1}.win h2{font-size:34px;letter-spacing:-1.5px;line-height:1.12;margin:12px 0}.win p:not(.eyebrow){font-size:15px;line-height:1.5}.primary{background:var(--green);color:var(--ink);border:0;border-radius:12px;padding:14px 20px;font-weight:800;font-size:16px}.primary:hover{background:#afe329}.text-button{display:block;background:transparent;border:0;margin:10px auto 0;padding:8px;font-size:13px;text-decoration:underline}.spark{position:absolute;width:9px;height:18px;top:-20px;animation:fall 1.9s ease-in forwards;pointer-events:none;z-index:2}@keyframes fall{to{transform:translate(var(--dx),600px) rotate(500deg)}}dialog{border:0;border-radius:24px;padding:32px;max-width:530px;width:calc(100% - 30px);max-height:90dvh;box-shadow:0 22px 90px #131d4344;color:var(--ink)}dialog::backdrop{background:#18234388;backdrop-filter:blur(3px)}dialog h2{font-size:32px;margin:12px 0 20px;letter-spacing:-1px}.dialog-close{position:absolute;right:16px;top:12px;border:0;background:#f0f2ec;border-radius:50%;width:34px;height:34px;font-size:24px}dialog ol{padding-left:20px;font-size:15px;line-height:1.5}dialog li{padding-left:5px;margin-bottom:12px}.help-extra,details{font-size:13px;line-height:1.55;color:#555f78}details{margin:14px 0 22px}summary{cursor:pointer;font-weight:700}dialog .primary{width:100%}.scene.shake{animation:shake .22s ease-in-out}@keyframes shake{25%{transform:translateX(-3px)}75%{transform:translateX(3px)}}
.check-button{display:flex;justify-content:space-between;width:calc(100% - 36px);margin:0 18px 16px;padding:13px 17px;background:var(--green);border:0;border-radius:10px;font-size:14px;font-weight:800}.check-button:hover{background:#afe329}
@media(min-width:1000px){.scene canvas{max-height:575px}.shell{padding-top:26px}}
@media(max-width:900px){.shell{padding:22px}.play-layout{grid-template-columns:minmax(0,1fr) 230px;gap:16px}.progress-card,.tip-card{padding:20px}.mode{font-size:16px;padding:12px}.mode-line{display:none}.board-header{padding:20px 20px 10px}.board-header h2{font-size:20px}.board-meta{padding-left:20px;padding-right:20px}.level-select>select{max-width:115px}.spatial-controls{padding:10px 12px 0}.height-controls{gap:6px}}
@media(max-width:700px){.shell{padding:18px 12px}.header{margin:0 4px 22px;gap:10px}.brand{gap:10px}.brand-mark{width:43px;height:47px;font-size:34px;border-radius:11px}h1{font-size:27px;letter-spacing:-1px}.brand .eyebrow{font-size:9px;letter-spacing:1.2px}.help-button{font-size:0;padding:8px;border:0}.help-button span{font-size:15px;width:26px;height:26px}.modes{gap:8px;margin-bottom:21px}.mode{font-size:14px;padding:12px 10px;gap:9px;border-radius:13px}.mode small{font-size:10px;margin-top:4px}.mode-number{font-size:16px;padding:8px 6px}.play-layout{display:flex;flex-direction:column;gap:16px}.play-card,.sidebar{width:100%}.board-header{padding:18px 17px 10px}.board-header h2{font-size:20px}.board-header .eyebrow{font-size:9px}.level-select{font-size:0;gap:0}select{font-size:13px;padding:9px 22px 9px 9px}.board-meta{font-size:11px;padding:0 17px 10px}.board-meta span:last-child{font-size:9px;letter-spacing:.6px}.scene{margin:0 8px;border-radius:12px}.scene canvas{aspect-ratio:1}.board-footer{padding:12px 16px;min-height:66px}.board-footer p{font-size:13px}.actions{padding:10px;gap:5px}.actions button{font-size:12px;padding:10px 3px}.actions span{font-size:18px;margin-right:1px}.spatial-controls{justify-content:center;gap:8px}.height-buttons button{min-width:52px}.camera-controls button{font-size:11px}.sidebar{display:grid;grid-template-columns:1fr;gap:14px}.progress-card{padding:18px;border-radius:20px}.progress-heading h2{font-size:16px}.progress-track{margin:10px 0 14px}.pairs{display:grid;grid-template-columns:repeat(2,1fr);column-gap:20px;row-gap:0}.pair{font-size:13px}.microcopy{display:none}.tip-card{margin:0;padding:20px}.tip-card h2{font-size:23px;margin:10px 0}.tip-card h2 br{display:none}.tip-card h2 br:after{content:' '}.quiet-note{margin:0;font-size:11px}.page-footer{font-size:10px;gap:20px;line-height:1.6}.page-footer span:last-child{font-size:8px;text-align:right}.win h2{font-size:28px}.win-icon{font-size:50px}.win p:not(.eyebrow){font-size:13px}dialog{padding:26px 23px}.height-controls>span{font-size:12px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

.footer-link{color:inherit;text-decoration:underline;text-underline-offset:2px}.footer-link:hover{color:var(--ink)}

/* Tutorial visual */
dialog{max-width:560px}.tut-title{margin:6px 0 14px}.tut{min-height:250px}.tut-step{display:grid;grid-template-columns:200px 1fr;gap:20px;align-items:center}.tut-visual{background:#fbfcf9;border:1px solid #edf0e8;border-radius:16px;padding:8px}.tut-svg{display:block;width:100%;height:auto}.tut-num{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--green);color:var(--ink);font-weight:800;font-size:15px;margin-bottom:8px}.tut-text h3{margin:0 0 8px;font-size:24px;letter-spacing:-.6px;line-height:1.1}.tut-text p{margin:0;font-size:15px;line-height:1.5;color:#3f4760}.tut-nav{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:18px 0 6px}.tut-arrow{width:44px;height:44px;border-radius:50%;border:1px solid #d9ddd3;background:#fff;font-size:28px;line-height:1;display:grid;place-items:center;padding:0 0 3px}.tut-arrow:hover:not(:disabled){background:#f0f2ec}.tut-dots{display:flex;gap:8px}.tut-dot{width:12px;height:12px;border-radius:50%;border:0;background:#dfe4d6;padding:0}.tut-dot.active{background:var(--ink);transform:scale(1.25)}.tut-more{margin:10px 0 16px}
@media(max-width:560px){.tut-step{grid-template-columns:1fr;gap:12px}.tut-visual{max-width:230px;margin:0 auto}.tut-text{text-align:center}.tut-text h3{font-size:21px}.tut-text p{font-size:14px}.tut{min-height:0}}