@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;450;500;550;600;650;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root{color-scheme:dark;--page:#151614;--panel:#1d1e1b;--canvas:#111310;--line:#32342d;--muted:#999e91;--text:#e9ece0;--accent:#eabb70;--font:'Noto Sans SC',system-ui,-apple-system,sans-serif;--mono:'Space Grotesk',monospace}
*{box-sizing:border-box}body{margin:0;background:var(--page);color:var(--text);font-family:var(--font);font-size:16px;-webkit-font-smoothing:antialiased}button,input,select{font:inherit}button{cursor:pointer;color:inherit}button,select,input,a{-webkit-tap-highlight-color:transparent}button{border:0}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible,canvas:focus-visible{outline:2px solid var(--accent);outline-offset:4px}button:disabled{opacity:.4;cursor:not-allowed}svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}.svg-library{position:absolute;width:0;height:0;overflow:hidden}[hidden]{display:none!important}.site-header{height:88px;max-width:1440px;margin:0 auto;padding:0 52px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:14px;text-decoration:none;color:var(--text);font-size:18px;font-weight:650;letter-spacing:1px}.brand-mark{height:34px;width:34px;position:relative}.brand-mark i{display:block;position:absolute;width:10px;height:10px;background:var(--accent)}.brand-mark i:nth-child(1){left:2px;top:1px}.brand-mark i:nth-child(2){left:20px;top:11px}.brand-mark i:nth-child(3){left:8px;top:24px}.brand-en{display:block;font-family:var(--mono);color:var(--muted);font-size:12px;letter-spacing:2.5px;font-weight:500;margin-top:4px}.header-right{display:flex;gap:32px;align-items:center}.edition{font-size:13px;color:#92988a}.help-button{background:transparent;display:flex;gap:8px;align-items:center;color:#c9cebf;font-size:14px;padding:9px 0 9px 12px}.help-button:hover{color:var(--accent)}main{max-width:1440px;margin:auto;padding:34px 52px 20px}.page-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:28px}.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:2px;color:var(--accent);margin-bottom:11px}h1{font-size:32px;letter-spacing:1px;font-weight:550;margin:0;line-height:1.45}h1 span{color:var(--accent)}.page-heading>p{margin:12px 0 0;color:var(--muted);font-size:14px;line-height:1.9;text-align:right}.lab-layout{display:grid;grid-template-columns:minmax(0,1fr) 278px;gap:20px;align-items:start}.workspace{border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--panel);min-width:0}.canvas-toolbar{height:55px;padding:0 16px;display:flex;align-items:center;justify-content:space-between}.simulation-status,.simulation-actions{display:flex;align-items:center;gap:12px}.simulation-status{font-size:13px;color:#d5d9cd}.status-dot{width:6px;height:6px;background:#b3c68f;border-radius:50%;box-shadow:0 0 10px #b3c68f22}.status-dot.paused{background:var(--accent);box-shadow:none}.toolbar-divider{height:16px;width:1px;background:#3a3d33;margin:0 3px}.world-label{color:var(--muted);font-size:12px;letter-spacing:.5px}.simulation-actions{gap:4px}.icon-button{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;background:transparent;color:#aeb5a2;border-radius:6px;transition:background .15s,color .15s}.icon-button:hover{background:#35372f;color:var(--text)}.icon-button svg{width:18px;height:18px}#pause-button{color:var(--accent);background:#eabb7010}.canvas-wrap{position:relative;width:100%;aspect-ratio:5/3;background-color:var(--canvas);background-image:radial-gradient(#3b403233 .7px,transparent .7px);background-size:16px 16px;overflow:hidden;border-top:1px solid #292c24;border-bottom:1px solid #292c24}#sandbox,#brush-preview{position:absolute;width:100%;height:100%;inset:0;image-rendering:pixelated}#sandbox{touch-action:none;cursor:none}#brush-preview{pointer-events:none}.canvas-corner{position:absolute;top:14px;width:9px;height:9px;border-top:1px solid #535a43;pointer-events:none}.top-left{left:14px;border-left:1px solid #535a43}.top-right{right:14px;border-right:1px solid #535a43}.canvas-footer{display:flex;justify-content:space-between;align-items:center;height:34px;padding:0 15px;color:#818a77;font-family:var(--mono);font-size:12px;background:#191c16}.canvas-footer>div{display:flex;gap:6px;align-items:center}.canvas-footer #particle-count,.canvas-footer #fps{color:#aab19c}.footer-divider{margin:0 6px;color:#505748}.canvas-coordinates{font-variant-numeric:tabular-nums}.scene-bar{min-height:67px;display:flex;align-items:center;gap:20px;padding:10px 18px;border-top:1px solid var(--line)}.scene-label{color:#bcc4ad;font-size:13px;white-space:nowrap;display:flex;align-items:center;gap:8px}.scene-label svg{width:15px;height:15px;color:var(--accent)}.scene-options{display:flex;gap:6px;align-items:center}.scene-button{padding:8px 11px;font-size:12px;color:#9ea68f;background:transparent;border:1px solid transparent;border-radius:5px;white-space:nowrap;transition:all .15s}.scene-button:hover{color:var(--text);background:#30342b}.scene-button.active{background:#33372b;border-color:#484f39;color:#dce4c8}.scene-note{font-size:12px;color:#717963;margin-left:auto;white-space:nowrap}.material-panel{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:20px}.panel-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}.panel-heading h2{font-size:16px;font-weight:550;margin:0}.panel-heading>span{font-family:var(--mono),var(--font);font-size:12px;color:#8f9683}.material-grid{display:grid;grid-template-columns:1fr 1fr;gap:9px}.material-button{display:flex;align-items:center;gap:10px;text-align:left;background:#252720;border:1px solid #35392e;min-height:66px;border-radius:7px;padding:12px 10px;position:relative;transition:background .15s,border-color .15s}.material-button:hover{background:#303329;border-color:#59604c}.material-button.active{border-color:var(--material-color);background:color-mix(in srgb,var(--material-color) 11%,#1d1e1b)}.material-swatch{position:relative;display:block;flex-shrink:0;width:25px;height:25px;background:var(--material-color);clip-path:polygon(0 25%,25% 25%,25% 0,75% 0,75% 25%,100% 25%,100% 75%,75% 75%,75% 100%,25% 100%,25% 75%,0 75%);box-shadow:inset -7px -7px 0 #0002}.material-button[data-material="2"] .material-swatch{clip-path:polygon(40% 0,60% 0,60% 20%,80% 20%,80% 40%,100% 40%,100% 80%,80% 80%,80% 100%,20% 100%,20% 80%,0 80%,0 40%,20% 40%,20% 20%,40% 20%)}.material-button[data-material="4"] .material-swatch{clip-path:polygon(20% 0,80% 0,80% 100%,20% 100%);box-shadow:inset -10px 0 #0002}.material-button[data-material="5"] .material-swatch{clip-path:polygon(40% 0,60% 0,60% 40%,80% 20%,80% 40%,100% 40%,100% 80%,80% 80%,80% 100%,20% 100%,20% 80%,0 80%,0 40%,20% 40%,20% 60%,40% 40%)}.material-button[data-material="6"] .material-swatch{clip-path:polygon(0 0,40% 0,40% 20%,60% 20%,60% 0,100% 0,100% 40%,80% 40%,80% 60%,60% 60%,60% 100%,40% 100%,40% 60%,20% 60%,20% 40%,0 40%)}.material-name{display:block;font-size:14px;font-weight:500}.material-en{font-family:var(--mono);color:#959c87;font-size:12px;display:block;margin-top:4px;letter-spacing:.5px}.material-key{position:absolute;top:5px;right:7px;font-family:var(--mono);font-size:12px;color:#6f7862}.material-button.active .material-name{color:var(--material-color)}.material-description{display:flex;gap:9px;margin:19px 0 20px;min-height:58px}.selected-marker{background:var(--accent);width:5px;height:5px;border-radius:50%;flex-shrink:0;margin-top:8px}.material-description strong{font-size:12px;font-weight:500;color:#bfc7af}.material-description p{font-size:12px;line-height:1.8;color:#8e9780;margin:4px 0 0}.brush-section{border-top:1px solid var(--line);padding-top:20px}.control-label{font-size:14px;display:flex;justify-content:space-between;align-items:center;font-size:13px}.control-label h3{font-size:13px;font-weight:450;margin:0}kbd{font-family:inherit;font-size:12px;color:#909982;font-weight:400}.tool-switch{display:flex;gap:7px;margin-top:12px}.tool-button{font-size:14px;display:flex;align-items:center;justify-content:center;gap:8px;width:50%;height:37px;border:1px solid #3a3f32;border-radius:6px;color:#949e85;background:transparent;font-size:12px}.tool-button svg{width:16px;height:16px}.tool-button.active{background:#34392b;color:#e0e6d5;border-color:#626c4d}.tool-button:hover{border-color:#879271}.brush-label{margin-top:23px}.brush-label output{font-family:var(--mono);font-size:12px;color:var(--accent)}.range-row{display:flex;align-items:center;gap:12px;margin-top:17px}.size-dot{display:block;border-radius:50%;background:#9ca98b;flex-shrink:0}.size-dot.small{width:4px;height:4px}.size-dot.large{width:13px;height:13px}input[type=range]{min-width:0;width:100%;appearance:none;height:3px;background:linear-gradient(to right,var(--accent) 25%,#444a39 25%);border-radius:2px;cursor:pointer}input[type=range]::-webkit-slider-thumb{appearance:none;width:12px;height:12px;background:var(--accent);border:3px solid #eac383;border-radius:50%}input[type=range]::-moz-range-thumb{width:8px;height:8px;background:var(--accent);border:2px solid #eac383;border-radius:50%}.speed-control{display:flex;align-items:center;justify-content:space-between;margin-top:23px;font-size:13px}.speed-control select{background:#252a20;color:#bfc9ad;border:1px solid #3d4432;border-radius:5px;padding:4px 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span{color:#b6c3a2}.help-secondary{font-size:12px!important;color:#93a17f!important}.primary-button{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;background:var(--accent);color:#2a251b;border-radius:7px;padding:12px;margin-top:22px;font-size:14px}.toast{position:fixed;bottom:26px;left:50%;transform:translate(-50%,15px);padding:10px 20px;border:1px solid #586544;border-radius:8px;background:#2d3625;color:#e5edda;font-size:13px;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:20;box-shadow:0 8px 30px #0005;white-space:nowrap}.toast.show{opacity:1;transform:translate(-50%,0)}.workspace:fullscreen{display:flex;flex-direction:column;border-radius:0;justify-content:center;background:var(--page)}.workspace:fullscreen .canvas-wrap{width:min(100%,calc((100vh - 156px)*5/3));margin:0 auto;flex:none}.workspace:fullscreen .canvas-toolbar,.workspace:fullscreen .canvas-footer,.workspace:fullscreen .scene-bar{flex-shrink:0}
@media(min-width:1550px){main{padding-top:45px}.page-heading{margin-bottom:35px}}
@media(max-width:1200px){.site-header{padding:0 30px}main{padding:28px 30px 20px}.lab-layout{grid-template-columns:minmax(0,1fr) 258px;gap:16px}.material-panel{padding:17px}.scene-note{display:none}.scene-bar{gap:12px}.keyboard-hints{gap:12px}.footer-note{display:none}.material-description{margin-bottom:17px}.eyebrow{font-size:12px}}
@media(max-width:900px){.lab-layout{grid-template-columns:1fr}.material-panel{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(180px,1fr);column-gap:24px}.panel-heading{grid-column:1;margin-bottom:13px}.material-grid{grid-column:1;grid-template-columns:repeat(3,1fr)}.material-description{grid-column:1;margin:15px 0 0;min-height:44px}.brush-section{grid-column:2;grid-row:1/4;border-top:0;border-left:1px solid var(--line);padding-top:0;padding-left:24px}.discovery{display:none}.brush-label{margin-top:17px}.speed-control{margin-top:18px}.canvas-wrap{max-height:56vh;min-height:240px;aspect-ratio:5/3}.page-heading>p{font-size:13px}.edition{display:none}.page-footer{margin-top:17px}}
@media(max-width:560px){.site-header{height:74px;padding:0 20px}.brand{font-size:16px;gap:10px}.brand-en{font-size:12px}.help-button span{display:none}.help-button svg{height:21px;width:21px}main{padding:23px 14px}.page-heading{margin-bottom:22px;padding:0 5px}.eyebrow{font-size:12px;letter-spacing:1.3px;margin-bottom:9px}h1{font-size:24px;letter-spacing:0}.page-heading>p{display:none}.canvas-toolbar{padding:0 10px;height:48px}.simulation-status{gap:8px}.world-label{font-size:12px}.simulation-actions{gap:1px}.toolbar-divider{margin:0 1px}.canvas-wrap{min-height:0;max-height:none}.scene-bar{padding:10px;min-height:58px;gap:8px}.scene-label{font-size:12px;gap:4px}.scene-label svg{width:13px}.scene-options{gap:2px}.scene-button{font-size:12px;padding:7px 9px}.material-panel{display:block;padding:17px;border-radius:10px}.panel-heading{margin-bottom:13px}.material-grid{grid-template-columns:repeat(3,1fr);gap:8px}.material-button{min-height:61px;padding:10px;gap:8px}.material-swatch{width:21px;height:21px}.material-name{font-size:13px}.material-en{font-size:12px}.material-description{margin:13px 0;min-height:0}.material-description>div{display:flex;align-items:baseline;gap:8px}.material-description strong{white-space:nowrap}.material-description p{font-size:12px}.brush-section{padding:15px 0 0;border-left:0;border-top:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr;gap:0 24px}.control-label:first-child{grid-column:1;grid-row:1}.tool-switch{grid-column:1;grid-row:2;margin-top:10px}.brush-label{grid-column:2;grid-row:1;margin:0}.range-row{grid-column:2;grid-row:2;margin:0 3px}.speed-control{grid-column:1/-1;margin-top:17px}.keyboard-hints{gap:9px 13px;font-size:12px}.keyboard-hints>span:nth-child(n+4){display:none}.page-footer{justify-content:center}.canvas-footer{height:30px;font-size:12px}.toast{font-size:12px;max-width:95vw;white-space:normal;text-align:center}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}